FLEXIBLE DUCTS BY SUBSURFACE INSTALLATION FOR MAGNETIC DETECTORS - Item
No.
RIGID DUCTS, CONCRETE ENCASED FOR MAGNETIC DETECTORS - Item No.
Special Provision No. 682S33
January 2015
Amendment to OPSS 603, November 2014
OPSS 603 is amended by the addition of the following section:
603.04
DESIGN AND SUBMISSION REQUIREMENTS
One week prior to the first duct installation, a work plan for installation of ducts shall be submitted to the
Contract Administrator.
The work plan shall include the following:
a) A description of the procedure for installation of the ducts within the roadway,
b) Depth measurement methodology.
c) Traffic Control measures.
d) Type of equipment to be used; and
e) Proof of training for the directional drilling staff that will perform the work provided by the magnetic
detector manufacturer, or proof of relevant experience.
Duct installation depth records shall be submitted to the Contract Administrator. Initially, one (1) hard copy
and one (1) electronic copy in Excel format of all completed duct installations shall be provided. The
documentation shall include all duct locations and all required measurements detailed in the Rigid Ducts,
Concrete Encased for Magnetic Detectors subsection and the Flexible Duct by Subsurface Installation for
Magnetic Detectors clause of this Special Provision. Partial submissions will not be accepted. For final
submission, two (2) hard copies and two (2) electronic copies of the documentation required for the
submission shall be provided.
603.05
MATERIALS
603.05.01
Concrete
Subsection 603.05.01 of OPSS 603 is deleted in its entirety and replaced with the following:
Concrete shall be according to OPSS 1350, rapid setting, high-early strength concrete with a compressive
strength of 20 MPa.
603.05.08
Ducts and Fittings
Subsection 603.05.08 of OPSS 603 is amended by deleting the first paragraph in its entirety and replacing it
with the following:
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The rigid ducts concrete encased for magnetic detectors shall be rigid PVC unplasticized conduit (EB1)
according to CSA C22.2 No. 211.2 Thin wall (DB2) ducts shall not be used.
Section 603.05 of OPSS 603 is amended by the addition of the following subsections:
603.05.11
Marking of Ducts Intended for Magnetic Detectors
Identification marker shall consist of a rectangular-shaped plate and flexible stake as specified in the Contract
Drawings.
603.05.12
Sensor Carriers
The carrier mechanism for the probes shall allow placement, holding and inserting of double or triple probe
magnetic sensors in duct.
Carriers shall allow probes to be placed at spacing increments reflecting duct installation results and/or
specific site conditions.
Carriers and magnetic sensors components shall be readily assembled on-site without special tools.
The first carrier within the chain (end cap carries) shall have a rope attached with sufficient strength to assist
in the removal of the carriers from the conduit.
Carriers shall hold up to twelve (12) lead-in cables in addition to the required pull rope for sensor placement.
Carriers and their interlinking mechanism shall have sufficient strength to allow insertion of probes and
auxiliary components into a duct of up to 35 m length meeting the installation requirements.
The carrier system shall have a locking mechanism to maintain the orientation of all magnetic sensors within
± 20 degrees of vertical.
Carriers shall be suitably sealed for use in a 100% humidity environment in the conduit, including submersion
in solutions of chemicals typical of roadway runoff.
OPSS 603 is amended by addition of the following section:
603.06
EQUIPMENT
Equipment used for flexible ducts by subsurface installation work shall be capable of maintaining depth and
alignment of the ducts and measuring the depth of the installation at any location at any point along the duct
axis. The duct installer shall be able to monitor the feedback from the drill head.
603.07
CONSTRUCTION
603.07.07
Rigid Ducts, Concrete Encased
Subsection 603.07.07 of OPSS 603 is deleted in its entirety and replaced with the following:
603.07.07
Rigid Ducts, Concrete Encased for Magnetic Detectors
The Contract Administrator shall be notified 48 hours prior to initiating this work.
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The duct and the concrete encasement under pavement for magnetic detectors shall be installed at depth as
indicated elsewhere the Contract Documents. The duct shall maintain constant depth and direction. The
horizontal or vertical deviation shall not exceed 20 mm/m of duct length. If the road surface is crowned the
depth shall conform to the shape of the crown. Ducts for the same detection station shall be installed 5 m
apart measured between the centreline of both ducts.
The duct will be used for installation of magnetic detectors enclosed within cylinder shaped plastic carriers.
Couplings used to connect lengths of ducts shall result in a smooth joint on the inside of the duct such that the
detector carriers can slide freely over the joints.
Duct clips made of flexible, non-corrosive material shall be installed to prevent movement of duct during
replacement of the concrete backfill in the trench. Duct clips shall be placed at 2 m intervals along the entire
run to ensure the duct is affixed firmly to the bottom of the trench.
Concrete may be poured directly into the trench. Concrete shall be placed according to OPSS 904 and the
Contract Documents. The finish shall be raked or trimmed to produce a flat surface.
A record of duct depth shall be maintained every 0.5 m. The depth documentation results shall include the
following:
a) Detector Station ID Number.
b) Duct roadside ends GPS Coordinates.
c) Duct Location Station.
d) Duct profile referenced against traffic lane configuration at the time of the installation and transposed
onto the final lane configuration as applicable. (Note: Where ducts are installed during road construction
and prior to the final lane configuration being in place, a survey of the final pavement markings shall be
obtained and the constructed duct profile transposed onto the final lane configuration and pavement
elevation.)
e) Depth of duct at the centre of each traffic lane.
f) Width of each traffic lane and shoulders.
g) Distance between the two ducts comprising magnetic detection station at center of each lane.
h) Signature of the inspector who witnessed the installation and measurements.
The duct shall extend 75 to 90 mm into the handhole at each end of the duct. Each end of duct shall be capped
with a press-fit cap.
For ducts installed in stages, the duct ends shall be plugged following each stage and install means of marking
the location of the ducts such that they may be located during the next stage of construction.
If magnetic detectors are not installed as part of the Contract, 22AWG tracer wire and blank carriers (without
sensors) shall be installed within each duct.
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603.07.09
Flexible and Rigid Ducts by Subsurface Installation
Subsection 603.07.09 of OPSS 603 is amended by addition of the following clause:
603.07.09.01
Flexible Duct by Subsurface Installation for Magnetic Detectors
The Contract Administrator shall be notified 72 hours prior to initiating this work. It is recommended that the
magnetic detector manufacturer representative be consulted regarding the equipment and procedures, and
invited to be present at the first drilling operation.
The duct installed under pavement by directional drilling shall be installed at depth as indicated in the
Contract Documents. The duct shall maintain constant depth and direction. The horizontal or vertical
deviation shall not exceed 20 mm/m of duct length. If the road surface is crowned the depth shall conform to
the shape of the crown except at the locations, where median handhole is not present. Ducts for the same
detection station shall be installed 5 m apart measured between centreline of both ducts. The installation for
lead and lag sensor ducts shall be done simultaneously.
The duct will be used for installation of magnetic detectors enclosed within cylinder shaped plastic carriers.
The duct inner surface shall be smooth such that the detector carriers can slide freely over the length of the
duct. The duct shall be continuous between the handholes. No splices are allowed.
A record of duct depth shall be maintained for every 0.5 m. The depth documentation results shall include the
following:
a) Detection Station ID Number.
b) Duct roadside ends GPS Coordinates.
c) Duct Location Station.
d) Duct profile referenced against traffic lane configuration at the time of the installation and transposed
onto the final lane configuration as applicable. (Note: Where ducts are installed during road construction
and prior to the final lane configuration being in place a survey of the final pavement markings shall be
obtained and the constructed duct profile transposed onto the final lane configuration and pavement
elevation.)
e) Depth of duct at the centre of each traffic lane.
f) Width of each traffic lane and shoulders.
g) Distance between the two ducts comprising magnetic detection station at center of each lane.
h) Signature of the inspector who witnessed the installation and measurements.
The duct shall extend 50 to 90 mm into the handhole at each end of the duct. Each end of duct shall be capped
with a press-fit cap.
If magnetic detectors are not installed as part of the Contract, 22AWG tracer wire and blank carriers (without
sensors) shall be installed within each duct.
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603.07.17
End Marking
Subsection 603.07.17 of OPSS 603 is amended by addition of the following clause:
603.07.17.01
Marking of Duct Intended for Magnetic Detectors
All ducts runs intended for installation of magnetic detectors shall be marked with a flexible stake marker
placed 2 m or more beyond edge of shoulder and by 50 mm x 50 mm cut cross in the shoulder just outside
edge of pavement line and on top of concrete barrier, where existing.
603.09
MEASUREMENT FOR PAYMENT
603.09.01.01
Flexible Ducts
Rigid Ducts, Concrete Encased
Rigid Ducts, Direct Buried
Rigid Ducts by Subsurface Installation
Rigid Ducts, Steel Encased by Subsurface Installation
Flexible Ducts by Subsurface Installation
Clause 603.09.01.01 of OPSS 603 is amended by addition of the following:
Rigid Ducts, Concrete Encased for Magnetic Detectors
Flexible Ducts by Subsurface Installation for Magnetic Detectors
603.10
BASIS OF PAYMENT
Section 603.10 of OPSS 603 is amended by addition of the following subsection:
603.10.03
Rigid Ducts, Concrete Encased for Magnetic Detectors - Item
Flexible Ducts by Subsurface Installation for Magnetic Detectors - Item
Payment at the Contract price for the above tender items shall be full compensation for all labour, Equipment,
and Material to do the work.
Progress payment for installation of the above tender items shall be based on the following percentages of the
Contract price:
80% for initial duct installation and submission of interim depth results
20% upon the installation and blank carriers and submission of final duct depth
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