SPECIFICATION
for
WORKS ON ROADS
Carried out for organisations other than the
Commissioner of Highways
(Including Excavation and Reinstatement of Road Pavement)
This Specification stipulates the requirements for undertaking work on roads under the care,
control and management of the Commissioner of Highways in South Australia. It applies to
any company, statutory authority, organisation or person that proposes to install, replace or
repair a Service in the road or undertake any other work on these roads.
CONTENTS
Specification for Works on Roads
Attachments
Part R06:
Boring
Part R07:
Trench Excavation and Backfill
Part R08:
Reinstatement of Existing Pavements
Pavement Reinstatement Configurations
The Pavement Reinstatement Configurations are available from:
http://www.dtei.sa.gov.au/documents/contractsandtenders/works_on_roads_by_other_organisations
Edition: Jan 2013
Specification for Works on Roads
SPECIFICATION FOR WORKS ON ROADS
CONTENTS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
1.
Introduction
Definitions
Position of Service
Notifications
Standard of Works
Under Road Boring
Final Surfacing of the Road
Attachment of Services to DPTI Structures
Location of Utility Service and the Commissioner’s Infrastructure
Protection of the Environment
Conformity Testing
Defects
Emergency Repairs
Care of Site
Hours of Work
Traffic Management
Work Zone Traffic Control Devices
Local Access and Traffic Restrictions
Audits
INTRODUCTION
This Specification applies when any company, statutory authority, organisation or person (“Owner”) proposes to
install, replace, repair or inspect a Service or undertake any other work on a road which is under the care, control and
management of the Commissioner of Highways (“Commissioner”).
This Specification applies regardless of whether the Owner is operating under powers pursuant to statute or by an
agreement with the Commissioner.
Compliance with this Specification will be deemed by the Commissioner to meet the requirements of the phrases
"make good", "reinstate" or “restore” used in applicable Code of Practice or any legislation which gives power to a
Statutory Authority to install infrastructure in a Road. The requirements of this Specification may only be varied by
the written agreement of the Commissioner.
The Commissioner may nominate a Representative who may exercise all powers and responsibilities of the
Commissioner under this Specification.
This Specification references the DPTI Master Specification for Transport Infrastructure. For convenience, Parts
R06,R207 and R08 of the Master Specification are attached to this document.
This specification applies to Services installed both transversely and longitudinally in the Road.
2.
DEFINITIONS
The meaning of terms used in this Specification shall be those in AS 1348 “Road and Traffic Engineering –
Glossary of Terms”, except where described otherwise in this Specification.
“Defect” means settlement, rutting or other deformation that signifies the deterioration of the Works, including but not
limited to any of the following:
(a) deformation of  20 mm under a 1.2 m straight edge;
(b) the surface of the pavement is cracked, ravelling or stripping; or
(c) any cracks greater than 3 mm within the reinstatement or between the reinstatement and the adjoining road
pavement.
“DPTI” means the Department for Planning, Transport and Infrastructure;
“DPTI Master Specification” means the DPTI Master Specification for Transport Infrastructure (available via the
internet from: http://www.dtei.sa.gov.au/standards/contractsandtenders/specifications) current at the date of
DPTI Specification for Works on Roads
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Specification for Works on Roads
commencement of work. A reference to “Part” or “Division” in this specification is a reference to a part or division
of the Master Specification;
“Hold Point” means an identified point in a work-related process, beyond which the subsequent activity cannot
proceed without release of the Hold Point by the Commissioner.
“Minor Works” means work up to 1 day’s duration from commencement to completion in the trafficable lanes;
“Major Works” means work exceeding 1 day’s duration from commencement to completion in the trafficable lanes;
“Pavement” includes the pavement of carriageways, road shoulders (sealed or unsealed), driveways, footpaths,
medians, traffic islands and aprons to side streets;
“Practical Completion” means completion of the Works, completely free of Defects, to the satisfaction of the
Commissioner;
“Road” means any road under the care, control and management of the Commissioner pursuant to the Highways Act
1926 (SA);
“TMC” means the DPTI Traffic Management Centre (telephone 1800 018 313);
“Working Day” means a week day from Monday to Friday inclusive that has not been designated as a South
Australian public holiday;
“Service” means a culvert, drainage structure, cable, conduit, pit, pipe or similar infrastructure;
“Works” means all infrastructure and work associated with the installation, replacement or repair of a Service in a
Road.
3.
POSITION OF SERVICE
The following order of precedence shall apply to the position and / or method of installation of the Service:
1.
Outside of the Pavement (i.e. in the verge or roadside)
2.
In footpaths (where present)
3.
In the road shoulder
4.
Installed by under Road Boring under traffic lanes
5.
Installed by trenching in a traffic lane.
The Owner must position / install the Service in accordance with the highest order of precedence which is reasonably
practicable.
4.
NOTIFICATIONS
4.1
General
Whenever the Owner proposes to undertake works on a Road, the Owner must notify the Commissioner by submitting
a "Notification of Works Impacting DPTI Roads" form, available by telephoning 1800 018 313 or from the
following internet address:
http://www.dpti.sa.gov.au/standards/contractsandtenders/works_on_roads_by_other_organisations
Traffic Management Plans must be attached to the form that show the location of all traffic control devices and
proposed times of traffic restrictions (regardless of duration).
4.2
Minor Works
The Owner must advise the Commissioner its intention to commence work on a Road at least 5 Working Days before
commencement of site work.
4.3
Major Works
The Owner must submit drawings, specifications and work methods to the Commissioner for approval at least 4 weeks
prior to commencement of site work. The submitted drawings must meet the requirements outlined in Appendix 1. In
the event that the Owner’s drawings and / or specifications are amended prior to the start of work, the Owner must
resubmit revised copies.
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Specification for Works on Roads
The Owner must advise the Commissioner its intention to commence work on a Road at least 5 Working Days before
commencement of site work.
4.4
Public Notification
No less than 2 weeks before the commencement of work on site, the Owner must notify all local businesses and
residents of possible disruptions that may affect them as a result of the work. If the Works restrict traffic flow and are
likely to impede emergency services, the Owner must notify all emergency services of the roadworks, no sooner
than 72 hours and no later than 24 hours prior to commencement of work.
If the Works will affect the operation of bus services, the Owner must contact the DPTI Public Transport Division to
ensure bus services are catered for adequately.
For Major Works exceeding 3 days duration, advance road works signs must be installed at key locations no less than 2
weeks prior to the commencement of work on site.
4.5
Contact Details
Prior to commencing work on site, the Owner must provide the Commissioner with the names and telephone
numbers of contact personnel.
4.6
Emergency Works
In the event of an emergency (refer Clause 11 “Emergency Repairs), the Owner must provide verbal notification to the
Commissioner as soon as practicable after the emergency becomes known. The Owner must submit a “Notification of
Works Impacting DPTI Roads" form to the Commissioner within 24 hours of the emergency occurring.
4.7
Notification of Completed Works
As soon as practicable after completion of the Works, the Owner must notify the TMC (telephone 1800 018 313) of the
completion of the Works on site.
4.8
As Constructed Drawings
If requested by the Commissioner, at any time within the Defects Liability Period, the Owner must supply the
Commissioner with details of the Works, including sketches or drawings showing size and location of the Service(s)
and the date constructed.
5.
STANDARD OF WORKS
The Works must be executed in accordance with the requirements of this Specification and all relevant Parts of the
DPTI Master Specification. The following parts and division of the DPTI Master Specification are specifically
referenced in this Specification:
Part R06
Boring
Part R07
Trench Excavation and Backfill
Part R08
Reinstatement of Existing Pavements
Part R09
Controlled Low-Strength Material (CLSM)
Part R15
Supply of Pavement Materials
Part R22
Plant Mixed Stabilised Pavement
Part R26
Application of Sprayed Bituminous Surfacing
Part R27
Supply of Asphalt
Part R28
Construction of Asphalt Pavements
Part R37
Pavement Crack Sealing
Part R42
Supply and Installation of Steel Beam Road Safety Barrier Systems
Part R44
Construction of Concrete Safety Barrier Systems
Part R46
Application of Pavement Marking
DPTI Specification for Works on Roads
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Specification for Works on Roads
Part R48
Supply of Signs and Supports
Part R49
Installation of Signs
Division L
Landscaping
The DPTI Master Specification is available from:
http://www.dpti.sa.gov.au/standards/contractsandtenders/specifications
The obligations of the Owner are those of the Contractor in the DPTI Master Specification. The Owner is liable to
the Commissioner for the acts and omissions of any contractor, sub-contractor or consultant engaged by the Owner
as if they were acts or omissions of the Owner. A reference to the Principal of Superintendent in the DPTI Master
Specification means a reference to the Commissioner. Where the DPTI Master Specification requires an approval,
the Commissioner is responsible for either providing or withholding that approval. The Commissioner owes no duty
to the Owner to review or examine any documentation submitted by the Owner for compliance with the
Specification or any applicable legislation. The failure of the Commissioner to enforce a provision of the
Specification shall not be interpreted as a waiver of that provision.
The Commissioner may specify requirements in addition to those in the Master Specification so that future
roadworks may be undertaken without the need for further relocation of the Service. Where the DPTI Master
Specification requires the release of a Hold Point, the Commissioner is responsible for either withholding or
releasing the Hold Point.
6.
UNDER ROAD BORING
Where a Service is to be installed longitudinally under a road pavement, the Commissioner encourages the use of
under-road boring in preference to the excavation and reinstatement of trenches.
Where a Service is to be installed transversely under a road pavement, the Service must be installed by under-road
boring in accordance with Part R06, unless the prior written approved of the Commissioner has been obtained.
The Owner may submit a request to vary the requirements of Part R06. Any such request must be made in writing
and submitted as soon as possible and no later than the time of submitting the “Notification of Works Impacting
DPTI Roads” form.
In considering the submission, the Commissioner will take into account the following:
(a) age of the existing surfacing;
(b) condition of the existing surfacing;
(c) size of the Trench;
(d) future proposed roadworks by the Commissioner; and
(e) traffic volumes on the Road.
7.
FINAL SURFACING OF THE ROAD
Unless approved otherwise in writing by the Commissioner, the final surfacing must comply with Part 208.
The Owner may submit a request to vary the requirements of Part 208. Any such request must be made in writing
and submitted as soon as possible, and no later than the time of submitting the “Notification of Works Impacting
DPTI Roads” form.
In considering the submission, the Commissioner will take into account the following:
(a) age of the existing surfacing;
(b) condition of the existing surfacing;
(c) size of the Trench;
(d) future proposed roadworks by the Commissioner; and
(e) traffic volumes on the Road.
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8.
Specification for Works on Roads
ATTACHMENT OF SERVICES TO DPTI STRUCTURES
Services may only be attached to structures only with the prior written approval of the Commissioner. Drawings,
including fixture details, must be submitted to the Commissioner for approval at least 6 weeks prior to commencement
of the intended work. A Service must not damage or penetrate a drainage culvert.
9.
LOCATION OF UTILITY SERVICES AND THE COMMISSIONER’S INFRASTRUCTURE
The Owner must arrange for the location of all existing utility services prior to commencement of the Works.
The Owner must determine the location of any traffic signal detector loop, traffic signal conduit or lighting conduit at
least 5 Working Days before commencing the Works by contacting the TMC. Care must be taken to prevent damage
to detector loops and conduits where excavation is undertaken in the vicinity of traffic signals. The Owner is
responsible for the cost of repair to any damage to the Principal’s infrastructure.
10.
PROTECTION OF THE ENVIRONMENT
At all times, the Owner must undertake the work in accordance with:
(a) the requirements of the Environmental Protection Act; and
(b) DPTI Operational Instruction 21.5 "Rail and Roadside Significant Sites", available under Vegetation
Documents from: http://www.dpti.sa.gov.au/standards/environment
11.
CONFORMITY TESTING
Unless advised otherwise by the Commissioner, the Owner is responsible for testing of the Works to verify compliance
with the requirements of this Specification. Copies of all test results shall be submitted to the Commissioner within
14 days of testing.
Testing shall be undertaken by a laboratory registered by the National Association of Testing Authorities (NATA). If
the Owner fails to undertake the required testing, the Commissioner may arrange for the required testing to be
undertaken and the cost of this testing shall become a debt due and payable from the Owner to the Commissioner.
Additional testing may be undertaken by the Commissioner. Where such testing shows that the reinstatement does
not comply with the specified requirements, the cost of the additional testing and any rectification works shall be
borne by the Owner.
12.
DEFECTS
12.1
General
Notwithstanding the Owner’s compliance with this Specification, the Owner warrants that it will repair any Defect
in the Works at its own expense that becomes apparent prior to the expiration of the Defects Liability Period. Except
for a defect that creates a hazard to road users (refer Clause 12.2), a Defect must be rectified within 7 days of the
Owner becoming aware of the Defect. If requested by the Commissioner, the Owner must undertake additional
conformity testing of the rectification Works.
During the Defects Liability Period, the Owner is responsible for maintaining the completed surface in a safe and
trafficable condition for all road users (including cyclists and pedestrians), unless an order covering the full cost of
maintenance is lodged with the Commissioner for the Commissioner to take over this maintenance responsibility.
The Defects Liability Period shall be in accordance with the following:
DEFECTS LIABILITY PERIOD
Where conformity testing is undertaken in accordance
with Clause Error! Reference source not found.
"Conformity Testing".
1 year after Practical Completion.
Where the Commissioner advises the Owner that
pursuant to Clause Error! Reference source not
found. “Conformity Testing”, conformity testing is not
2 years after Practical Completion.
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Specification for Works on Roads
DEFECTS LIABILITY PERIOD
required and the Owner elects not to undertake
conformity testing.
Where conformity testing is required pursuant to
Clause Error! Reference source not found.
“Conformity Testing” and the Owner fails to undertake
conformity testing.
3 years after Practical Completion.
Where the Owner is required to undertake rectification
work due to a Defect occurring during the Defects
Liability Period.
As above, or 12 months from when the Defect is
fully rectified and the Commissioner is notified
accordingly, whichever is the later.
In the event that a Defect is not rectified within the timeframes specified in this Specification, the Commissioner
may arrange for the repairs to be undertaken and the cost of the repairs shall be a debt due and payable from the
Owner to the Commissioner.
If the Defect is a crack greater than 3mm, the crack must be sealed in accordance with Part 237 “Pavement Crack
Sealing”.
12.2
Hazardous Defects
Where the Works creates a hazard to road users, the Owner must immediately make the road safe for road users and
commence rectification of the defect. Rectification of the defect must be completed as soon as practicable. For the
purpose of this Clause, a deformation is deemed to be a hazardous defect it exceeds the following under a 1.2 m
straight edge:

Within trafficked lanes:
50 mm

Within bike lanes:
20 mm.

the Owner does not rectify a hazardous defect as soon as practicable; and

the Commissioner then makes the Road safe,
If:
the cost of the rectification work carried out by the Commissioner to make the Road safe shall be a debt due and
payable from the Owner to the Commissioner.
13.
EMERGENCY REPAIRS
For the purpose of this clause, an emergency refers to an unforseen event which causes significant damage to the Road
(such as a burst water main) and requires immediate closure of traffic lane(s) for public safety. Following repair of the
Services, a temporary pavement may be placed by the Owner to enable the opening of the traffic lane(s) as soon as
practicable. The permanent repair of the Road must comply with the requirements of this Specification. Any call out
costs reasonably incurred by the Commissioner as a result of the emergency shall be a debt due and payable from the
Owner to the Commissioner.
14.
CARE OF SITE
Stockpiles of materials must be located within areas that are delineated by traffic control devices (bollards and
containment fence or equivalent) and placed such that they do not impede the line of sight for road users. Stockpiles
must not be left on the carriageway when work is not in progress. Stockpiles left on road shoulders whilst work is not
in progress must be located a minimum of 2.5 m from the edge of seal.
Rubbish and surplus material arising from execution of the Works must be regularly removed from the site so that at
the completion of the Works the site is clean, tidy and free from surplus material. Surplus material must not be spread
over roadside areas.
Drainage sumps, pipes, culverts and waterways must be inspected for any silt and other material from the Works that
has entered past silt traps and other protection measures and must be cleaned out accordingly.
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15.
Specification for Works on Roads
HOURS OF WORK
Unless unavoidable due to emergency circumstances, or otherwise approved in writing by the Commissioner, work
which will disrupt traffic flow must not be carried out during any of the following periods:
(a) 7.00 am to 9.00 am on peak flow traffic lanes;
(b) 4.00 pm to 6.00 pm on peak flow traffic lanes;
(c) during Clearway times on roads designated as Clearways or bike lanes.
16.
TRAFFIC MANAGEMENT
16.1
General
The Owner is responsible for traffic management at the worksite from the time of commencement of the Owner’s
activities at the worksite to the time of completion of the Owner’s activities.
This includes ensuring that the road is safe for users of the road, providing a safe work area for those involved in
work on the trafficked network and minimising any disruption to the smooth flow of traffic in accordance with the
requirements of this Specification. Unless specified otherwise by the Commissioner, provision for existing traffic
and pedestrian movements (including access to properties and local roads) affected by the Owner’s activities must
be maintained at all times.
The Commissioner owes no duty to the Owner to review any traffic management plan submitted by the Owner for
errors, omissions or compliance with the requirements. The Commissioner may direct the suspension of Works in
the event that the Owner does not comply with the traffic management parts of this Specification.
16.2
Notification of Lane Closures
Unless advised otherwise by the Commissioner, the Owner must notify the TMC on telephone 1800 018 313 a
minimum of 15 minutes prior to closing a portion of the Road and again within 15 minutes of the Road being reopened
to traffic. Should the work in progress cause unnecessary traffic build-up and delays, the Owner must liaise with the
TMC to ensure satisfactory traffic flows are restored.
16.3
Standards and Codes
The Owner must ensure that traffic control devices and signs used at the Site are in accordance with:
(a)
Road Traffic Act 1961 (SA);
(b)
AS 1742.3 "Manual of Uniform Traffic Control Devices";
(a)
DPTI: The Manual of Legal Responsibilities and Technical Requirements for Traffic Control Devices:
(b)

Part 1 – The Notice from the Commissioner of Highways for the Temporary Use of Traffic
Control Devices by personnel other than Road Authorities;

Part 2 – Code of Technical Requirements for the Legal Use of Traffic Control Devices;
specifically Section 4 – Speed Control."; and
DPTI: Field Guide, “Traffic Control Devices for Workzone Traffic Management”.
In the event of an inconsistency between any of the above documents, the higher standard shall apply.
To order a copy of the DPTI Field Guide, refer to:
http://www.transport.sa.gov.au/pdfs/forms/WZTM_Order_Form_-_Field_Guide_July_2011.pdf.
Other DPTI publications are available from the following web site: http://www.dpti.sa.gov.au/standards/tass.
16.4
Accreditation for Signing at Roadworks
The Owner must ensure that at least one person who is accredited in signing at roadworks is on site at all times
while work is being carried out. Accreditation for signing at roadworks can be obtained by successfully completing
the training course "Work Zone Traffic Management". A list of approved training providers is available from the
Traffic and Access Standards Section, DPTI, telephone (08) 8343 2283.
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16.5
Specification for Works on Roads
Traffic Control
Stop/slow banners or temporary traffic signals must be used in accordance with AS 1742. 3 whenever two way
traffic is restricted to a single lane. Only complete lanes shall be closed and a minimum of one half of the roadway
must remain open to traffic at all times, unless otherwise approved by the Commissioner.
16.6
Delineation
Wherever pavement marking has been removed, temporary delineation must be provided at the site until reinstatement
of pavement marking has been completed. Self-adhesive Temporary Retroreflective Raised Pavement Markers
(RRPM) must be used for temporary delineation on the finished surface course. The RRPM must be white, 100 mm
wide and 50 mm high and must comply with Appendix C of AS 1742.3. Temporary linemarking must not be placed
on the finished surface course.
Permanent linemarking must be installed within 10 working days of the completion of the reinstated pavement.
16.7
Records
The Owner must maintain accurate records of all traffic management activities (including audits). The records must
include the date, time of operation, extent, location and the nature of the speed restriction implemented.
16.8
Hauling of Cable Through Conduit
Where the Works includes the hauling of cables through conduits on Roads, the Owner must submit a site specific
traffic management plan. When the hauling of cables through conduits is for distances exceeding 0.5 km, the traffic
management plan must be for each work site.
17.
WORK ZONE TRAFFIC CONTROL DEVICES
17.1
Devices
The Owner must supply all necessary Temporary Traffic Control Devices such as signs, barriers, bollards, cones and
other approved devices. All Temporary Traffic Control Devices must be located and maintained such that they
provide the required level of traffic control. The Owner must make allowance to replace devices that become
ineffective during the course of the Works, including those damaged by vehicles or vandalism.
17.2
Regulatory Devices
At the completion of the Works, the Owner must reinstate any regulatory devices (such as regulatory signs or
pavement marking) that have been temporarily removed or covered.
18.
LOCAL ACCESS AND TRAFFIC RESTRICTIONS
The Owner must:
(a) maintain provision for safe and convenient pedestrian traffic and control pedestrian movement through the
work site in accordance with AS 1742.3 and the appropriate AS Field Guide;
(b) provide and maintain access to property entrances adjoining the Works;
(c) provide for local traffic throughout the Works, and
(d) provide temporary ramps for local traffic and access to side streets where necessary.
19.
AUDITS
The Commissioner may undertake audits of signing at roadworks at any time.
____________
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Specification for Works on Roads
APPENDIX 1
REQUIREMENTS FOR DRAWINGS SUBMITTED BY THE OWNER
(Refer Clause 4.3 “Major Works”)
1.
Drawings shall use a suitable base (the road authority may be able to provide appropriate base drawings) to a
scale that would generally not be smaller than 1:500.
2.
The drawings shall show a north point.
3.
The name of the road on which the works are proposed to be carried out, shall be clearly shown.
4.
The names of nearby intersecting roads shall be clearly indicated.
5.
The drawings shall clearly indicate which side of the road and the distance from the edge of the road and/or
road reserve boundary that the infrastructure is proposed to be installed.
6.
For infrastructure that is proposed to be placed underground, the depth of cover shall be indicated on the
drawings.
7.
If the proposed infrastructure is likely to be positioned within 1 metre of other utility infrastructure already
existing in the road reserve, this shall be clearly indicated on the drawings.
8.
If the proposed infrastructure is likely to affect any vegetation that has significant conservation value, any
building with a heritage listing etc., this shall be clearly indicated on the drawings.
9.
Where infrastructure is proposed to cross under a road pavement, the location of pits on each side of the road
shall be located as close as possible to the boundary and clearly indicated on the drawings, together with the
proposed depth of cover under the road pavement. If possible, pits shall be located on side roads.
10. If infrastructure is proposed to be attached to any structure owned by the road authority, this shall be clearly
indicated on the drawings. In such cases, digital photos marked up to show the proposed location of the
infrastructure (conduit, antenna etc.) on and adjacent to the road authority structure, shall accompany the
drawings. Refer to Clause 5 “Attachment of Services to DPTI Structures”.
11. Plans shall also be provided to indicate how traffic (vehicles and pedestrians) will be managed during the course
of the proposed works.
__________
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Specification: Part 206 Boring
PART R06
BORING
CONTENTS
1.
2.
3.
4.
5.
6.
General
Quality Requirements
Installation
Boring Under Roads
Reserved
Verification Requirements and Records
1.
GENERAL
This Part specifies the requirements for the installation of culverts, cables, conduits and pipes (“Services”) under
roads, railway tracks and structures by boring. For the purposes of this part, boring includes any trenchless method,
such as thrust boring and tunnelling.
Documents referenced in this Part are listed below:
AS 4799:
2.
Installation of Underground Utility Services and Pipelines within Railway Boundaries
QUALITY REQUIREMENTS
Boring shall be undertaken using industry best practice. Where:
(a)
the bore diameter exceeds 500 mm;
(b)
multiple conduits are installed in a single bore; or
(c)
the Service is to be installed under a railway,
the Contractor shall prepare and implement a Quality Plan that includes the following documentation at a
minimum:
(a)
full details of the methodology to be used; and
(b)
details of equipment to be used.
If not submitted beforehand, the documentation required by this Clause shall be submitted at least 7 days prior to
the commencement of site work.
Provision of the documentation listed in this Clause shall constitute a HOLD POINT.
3.
INSTALLATION
The installation of the Service must not disturb or damage any pavement, railway infrastructure or other structure in
any way.
Where multiple bores or tunnels are used, there shall be a minimum spacing of 10D (where D is the diameter of the
largest conduit or service) between individual bores or tunnels to ensure the combined surrounding cavities of multiple
bores or tunnels do not undermine any pavement, railway tracks and formation or structure. Boring by water jetting is
not permitted. Where the Service is installed by thrusting, the initial borehole must be not less than 90% of the
overall diameter of the Service.
Services installed under road pavement and shoulders by under-road boring shall have a minimum cover of 1.5 m
below the surface.
Services installed under railway tracks by under track boring shall have a minimum of 2 m cover from the top of
the existing rail and a minimum cover of 1.5 m below the surface elsewhere.
DPTI XXCxxx
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Edition: August 2011
4.
Specification: Part 206 Boring
BORING UNDER ROADS
This clause only applies where a Service is to be installed under a road pavement.
Where a Service is to be installed longitudinally under a road pavement, the use of under-road boring in preference to
the excavation and reinstatement of trenches is encouraged.
Where a Service is to be installed transversely under a road pavement, the use of under-road boring to install the
Service is mandatory, unless the prior written approved of the Principal has been obtained or the full road pavement is
to be reconstructed after the Service has been installed.
5.
Reserved
6.
VERIFICATION REQUIREMENTS AND RECORDS
Where the bore diameter exceeds 500 mm or multiple conduits are installed in a single bore, the Contractor shall
supply a completion report within 2 weeks of completion of the installation. The report must guarantee the
appropriateness of the method used (covering depth etc.) and the quality of work. The report must be prepared by a
Professional Engineer who has experience with trenchless technology.
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Specification: Part R07 Trench Excavation and Backfill
PART R07
TRENCH EXCAVATION AND BACKFILL
CONTENTS
1.
2.
3.
4.
5.
General
Removal of Existing Pavement
Excavation
Use of Steel Plates
Backfill
1.
GENERAL
This Part specifies the requirements for the excavation and backfill of trenches or similar excavations up to the level
of the underside of the pavement (or natural surface outside of pavements).
For the purposes of this part, “Trench” includes any excavation constructed for the installation, maintenance or
inspection of culverts, drainage structures, cables, conduits, pits and pipes (“Services”).
2.
REMOVAL OF EXISTING PAVEMENT
This clause only applies where excavation takes place in an existing pavement which is to be retained.
The pavement shall be saw cut or cold planed prior to excavation. Any additional breakage of the existing
pavement edge shall be cut out square to the edge of the excavation prior to reinstatement.
All saw cutting shall be dampened by water to reduce dust and any resultant slurry shall be collected and disposed of
in accordance with the requirements of the Environmental Protection Act. The slurry must not enter stormwater
drainage systems or dry out on the road surface.
Removal of existing pavements shall comply with the following:
(a)
Asphalt Surfaced Roads
The trench shall be cut or cold planed to the full depth of the existing asphalt surface. Where cement stabilised
pavement exists, the pavement shall be cut to the full depth, or a minimum cut depth of 200 mm, whichever is
the lesser. Note that saw cutting or cold planning in addition to that specified by this clause may be required to
meet the requirements of Clause R08.6.2 “Asphalt”.
(b)
Sprayed Bituminous Surfaced Roads
The trench shall be saw cut to the full depth of the pavement, or a minimum of 300mm whichever is the lesser.
Longitudinal saw cuts shall not be positioned within the wheel path.
3.
EXCAVATION
All excavation shall be of sufficient width to allow for safe and practical working, including the proper placing and
subsequent removal of any formwork, shoring or dewatering systems and for the compaction of the backfill.
The depth of the Trench shall be sufficient to achieve the minimum cover of 1.0 m to the Service and the requirements
of any applicable Service Authority. This minimum cover does not apply to culverts installed for stormwater, DPTI
assets (eg electrical or telecommunications conduit) and Services installed in unsealed roads.
Where excavation takes place outside of existing pavement, any topsoil present shall be stripped and stockpiled to a
depth of 100mm or other depth specified. Unless specified otherwise, any surplus excavated material not used
elsewhere in the Works shall be removed from the site and disposed of by the Contractor in accordance with the
requirements of the Environment Protection Act.
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Edition: January 2013
4.
Specification: Part R07 Trench Excavation and Backfill
USE OF STEEL PLATES
If steel plates are used to enable traffic to cross an excavation, the Contractor must ensure that:
(a) the surface of the plate does not create a skidding hazard to motorists;
(b) a speed restriction of 60km/h or less is imposed on the section of road where a steel plate is situated;
(c) there is a smooth transition for traffic from the road surface onto the steel plate by the use of a temporary
ramp;
(d) the steel plate is treated with an approved anti-skid compound in accordance with the manufacturer’s
instructions (the use of checker plate or plain steel alone is insufficient); and
(e) the steel plate is restrained, pinned or anchored to reduce impact noises caused by motorists.
The anti-skid compounds listed in the DPTI Approved Products List, available from:
http://www.dpti.sa.gov.au/documents/contractsandtenders/specifications/general are approved for use on steel
plates. The Contractor may submit a request for the approval of additional anti-skid products.
The anti-skid compound must be maintained in good order. The skid resistance must exceed 0.5 GN when tested in
accordance with DPTI Test Procedure: TP344 “Determination of Skid Resistance with the GripTester”, available
from: http://www.dpti.sa.gov.au/standards/materials_technology_documents/test_procedures2
5.
BACKFILL
5.1
General
This clause applies to the backfill of Trenches and to the placement of backfill against Services not in excavation.
Prior to, and during backfill operations, all loose rubbish and foreign material shall be removed from the Trench.
All voids excavated and not occupied by permanent work shall be backfilled.
Warning tape which has been specified or is a requirement of a Utility Service Authority shall be inserted at the depth
specified.
5.2
Backfill Material
Excavated material shall not be reused for backfill of Trenches below areas of pavement.
(a)
Services Installed in Trenches
Backfill material shall be Sa-C Type C Sand in accordance with Part R15 or Controlled Low-Strength
Material (CLSM) in accordance with Part R09.
Below pavement, the backfill material shall extend to the underside of the reinstated pavement.
In verges and roadsides (ie outside of the pavement area), the backfill material shall extend to a level at least
300 mm above the top of the Service after compaction. Unless specified otherwise, excavated material may be
used above this level.
(b)
Services Installed Within Fill Locations
Backfill material shall be Sa-C Type C Sand and shall be placed to a level at least 300 mm above the top of the
Service after compaction.
5.3
Placement of CLSM Backfill
If CLSM is used, it shall be placed in accordance with Appendix K “Controlled Low Strength Materials—CLSM”
of AS 2566.2: Buried flexible pipelines - Part 2: Installation.
5.4
Placement of Sand Backfill
Sa-C Type C Sand backfill shall be compacted alternately on each side of the Service. Backfill shall not be placed
against any cast-in-place concrete within 48 hours of the placing of concrete. Flooding of sand with water is, by
itself, not an acceptable method of compaction.
DPTI XXCxxx
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Edition: January 2013
5.5
Specification: Part R07 Trench Excavation and Backfill
Backfill Against Drainage Structures
Backfill placed against drainage structures shall:
(a) be free draining material in locations where it is necessary to prevent the build up of hydrostatic pressures;
(b) develop sufficient strength to ensure it is stable and does not undergo post construction settlement;
(c) where backfill is to be placed on both sides of wing walls or retaining walls, the backfill shall be brought
up level with a maximum height differential of 300 mm;
(d) not be placed against concrete which is less than 48 hours old; and
(e) not be placed against wingwalls or retaining walls until all cast in place concrete has reached the 28 day
characteristic compressive strength and is at least 14 days old.
5.6
Compaction of Backfill
Unless specified otherwise, the backfilling shall be uniformly compacted in horizontal layers not exceeding 200 mm
(loose) thickness.
Compaction and the compaction test frequency shall comply with Table 5.6.
AS 1289, test method 5.2.1 (modified compaction) shall be used to determine the Dry Density Ratio.
TABLE 5.6 COMPACTION
Minimum Backfill Compaction
(Dry Density Ratio - % modified)
Below Sealed Pavement
Below Unsealed
Pavement and Shoulder
Outside of areas of
Pavement
Between 800 mm below finished
surface and the underside of
pavement
95
95
90
More than 800 mm below
finished surface
92
92
90
Minimum Compaction Test Frequency
Small box culverts and
stormwater pipes 1 m or less in
diameter:
1 test per 5 m3 or part thereof
Large box culverts and
stormwater pipes over 1 m in
diameter:
1 test per 10 m3 or part thereof
All other Services:
1 test per 10 m3 or part thereof unless an approved compaction methodology
has been implemented
A minimum of 3 compaction tests shall be carried out.
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DPTI XXCxxx
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Edition: October 2011
Specification: Part R08 Reinstatement of Existing Pavements
PART R08
REINSTATEMENT OF EXISTING PAVEMENTS
CONTENTS
1.
2.
3.
4.
5.
6.
7.
General
Construction of Pavement
Shoulders
Unbound and Cement Treated Pavements
Temporary Pavement Surface
Surfacing
Reinstatement of Other Infrastructure
Attachment R08A:
1.
Minimum Surfacing Reinstatement Requirements
GENERAL
This Part specifies the requirements for the reinstatement of an existing pavement above an excavation carried out
for purposes such as the installation, maintenance or inspection of culverts, drainage structures, pits, cables,
conduits and pipes.
2.
CONSTRUCTION OF PAVEMENT
Unless specified otherwise, reinstatement of an existing pavement shall be undertaken in accordance with the
applicable figure specified in the “Pavement Reinstatement Configurations", available from:
http://www.dpti.sa.gov.au/standards/contractsandtenders/works_on_roads_by_other_organisations.
Notwithstanding this requirement, a reinstated pavement shall not be of a lesser standard and thickness than the
existing pavement.
The supply of pavement materials shall comply with Part R15.
3.
SHOULDERS
The reinstatement of unsealed shoulders shall match finished shoulder level and existing crossfall. Sealed shoulders
shall be resealed with materials matching the original surface. If traffic is diverted onto the road shoulder as part of
traffic management, the shoulder shall be returned to the condition that existed prior to the Works taking place.
4.
UNBOUND AND CEMENT TREATED PAVEMENTS
Unbound granular pavement layers shall be uniformly compacted in horizontal layers not exceeding 200 mm thickness
(loose). Specified compaction shall be determined using AS 1289, test method 5.2.1 (modified compaction) and tested
at the frequency specified in Table 4.
TABLE 4: COMPACTION TESTING FREQUENCY - UNBOUND PAVEMENT
0 - 25 m2
one test per layer
25 - 100 m2
2
over 100 m
minimum 2 tests per layer
2 tests per layer and an additional test per layer for every
100 m2 or part thereof over 100 m2
Cement treated pavements shall comply with Part R22.
5.
TEMPORARY PAVEMENT SURFACE
The open surface of any pavement layer shall be maintained to prevent deterioration and the ingress of water prior to
the application of the final surfacing. In the event that the reinstatement and / or surrounding pavement layers become
affected by the ingress of water prior to the application of final surfacing, all affected material shall be removed and
replaced with conforming material.
DPTI XXCxxx
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Edition: October 2011
Specification: Part R08 Reinstatement of Existing Pavements
If the final surfacing is not placed before the reinstatement is opened to traffic, a temporary asphalt or bituminous
surface, similar to that previously existing, shall be provided and maintained in a safe and trafficable condition for all
road users, including cyclists and pedestrians. Where asphalt is used as the temporary surface, the minimum depth of
asphalt shall be 50 mm.
6.
SURFACING
6.1
General
The supply and placing of the surfacing shall be undertaken in accordance with the requirements of the applicable
figure in the Pavement Reinstatement Configurations document.
Unless approved otherwise in writing, the final surfacing shall extend:
For a transverse Trench:
Not less than that shown in Attachment R08A.
For a longitudinal Trench:
Full lane width.
The joint between the existing and reinstated final surfacing shall not be positioned within the wheel path.
6.2
Asphalt
The final wearing course of the reinstatement of asphalt surfaced pavements shall be extended beyond the sides of
the Trench by cold planning and reinstating to a minimum depth of 50 mm.
Unless approved otherwise in writing, the wearing course shall be laid with a paver. Within the DPTI Metropolitan
Region, the wearing course shall contain polymer modified binder.
Asphalt layers, including the final surfacing, shall comply with the quality requirements, level tolerances and surface
irregularity acceptance criteria of Part R27 “Supply of Asphalt” and Part R28 “Construction of Asphalt
Pavements”, except that the frequency of sampling and testing shall be in accordance with Table 6.2.
TABLE 6.2: SAMPLING AND TESTING FREQUENCY - ASPHALT
0 - 30 tonnes
2 samples & tests
31 - 150 tonnes
4 samples & tests
151 - 300 tonnes
6 samples & tests
> 300 tonnes
6 samples & tests plus 1 sample & tests for each additional
200 tonnes or part thereof
The asphalt mix must be registered with DPTI in accordance with Part R27 and be identified as such on cartnotes.
Attention is drawn to Clause 6.4 “Tack Coating” of Part R28 which requires tack coating to be applied to vertical
edges between old and new asphalt pavements. On completion of reinstatement, any residual saw cuts shall be
sealed to prevent water ingress into the pavement in accordance with Clause 6.3 “Joint Sealing”.
6.3
Joint Sealing
6.3.1
Materials
The sealing compound shall be Class 170 bitumen to AS 2008 "Residual Bitumen for Pavements", modified with an
appropriate polymer. It shall be designed to penetrate the joint or saw cut, adhere to the surface and resist crack
propagation. The compound shall remain stable on the pavement surface during periods of extreme temperature and
shall be approved in accordance with Part R37 “Pavement Crack Sealing” prior to use. Grit shall be Sealing Aggregate
SA5-2.
6.3.2
Sealing Treatment
Prior to placement of sealant, joints or saw cuts shall be thoroughly cleaned of foreign material, without damage to the
adjoining sound pavement, to provide a clean, dry environment. If the pavement is damp, warm/hot compressed air
may be used to dry of the surface of the joints or saw cut. Sealing shall not be undertaken unless the surfaces that the
sealant will be applied to are dry.
DPTI XXCxxx
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Edition: October 2011
Specification: Part R08 Reinstatement of Existing Pavements
Joints and saw cuts shall be cleaned to a minimum depth 15 mm. In excessively deep cuts, the void may be plugged
with grit to within 15 mm of the pavement surface. All voids shall be filled with sealant material to a level of not less
than 15 mm below the pavement surface.
The level of sealant after gritting shall be flush with the adjoining road pavement. The width of the visible bond on
the pavement surface shall be as narrow as practical. The sealant shall not run out over the pavement surface
beyond the extent of the joint or saw cut.
6.3.3
Gritting
Grit shall be placed on the surface of all sealant while it is sufficiently hot for the grit to adhere to the sealant. Grit
shall be placed at the minimum application necessary to provide adequate skid resistance and prevent pick-up of the
sealant by traffic.
6.4
Sprayed Bituminous Surfacing
The reinstatement of sprayed bituminous surfacing shall be undertaken in accordance with the requirements of
Part R26. Sprayed bituminous surfacing shall comprise of a primerseal and sprayed bituminous surfacing, with the
surfacing placed not less than 48 hours after the primerseal has been placed.
The surfacing shall match the size and texture of the existing adjacent road and be finished off evenly and flush with
the adjoining pavement surface. The resultant surfacing shall be within the tolerance of 15 mm as measured by a 3 m
straight edge in any direction.
7.
REINSTATEMENT OF OTHER INFRASTRUCTURE
All pavement marking, road furniture, drainage systems, secondary paving and similar infrastructure which has been
removed or damaged during the excavation and reinstatement work shall be replaced to the standard matching the
existing and in accordance with the relevant parts of the DPTI Master Specification as listed in Table 7.
TABLE 7
INFRASTRUCTURE TYPE
REQUIREMENT
Pavement marking (includes raised
pavement markers or pavement
bars)
Replacement in accordance with Part R46 "Application of
Pavement Marking".
Road Furniture (includes road
signs, guide posts, safety barrier)
Replacement in accordance with:
The marking shall be completed within 5 working days of the
completion of the final surfacing.
 Part R42 “Supply and Installation of Steel Beam Road
Safety Barrier Systems”,
 Part R48 “Supply of Signs and Supports”; and
 Part R49 “Installation of Signs”.
Suppliers of signs must be prequalified with DPTI.
Concrete kerb and gutter or median
type kerb
Replacement in accordance with Part R06 “Kerbing”.
Vegetation
Any vegetation shall be replaced with vegetation that is of the
same type and in the same positions as that removed or
damaged in accordance with Division L “Landscaping” of the
DPTI Master Specification.
DPTI XXCxxx
Kerb reinstatement shall be completed within 3 days of
reinstatement of the road pavement.
Page 18
Edition: October 2011
Specification: Part R08 Reinstatement of Existing Pavements
Medians and traffic islands
Where the existing median consists of compacted granular
material, the median shall be reinstated with PM2/20
compacted to no less than 92% of the dry density determined
using AS 1289, test method 5.2.1 (modified compaction).
Footpaths and brick paved areas
Match existing pavement (ie base and any sub-base)
configuration and surfacing type.
Road drainage systems
Report damage.
DPTI XXCxxx
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Edition: October 2011
DPTI XXCxxx
Specification: Part R08 Reinstatement of Existing Pavements
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Edition: October 2011
Specification: Part R08 Reinstatement of Existing Pavements
ATTACHMENT 1
MINIMUM SURFACING REINSTATEMENT REQUIREMENTS
Trenching at 90 degrees to the road
TRENCH
Minimum 1m
2.5m
2.5m
Edge of Seal
Trenching diagonally across the road
TRENCH
2.5m
2.5m
2.5m
2.5m
Trenching along the road
TRENCH
Lane Width
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DPTI XXCxxx
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