Iqaluit Airport, Nunavut
Re-Opening of Taxi A and
Rehabilitation of Apron I
2005.11.30
Section 02321
Blasting / Rock Excavation
Page 1
PART 1 - GENERAL
1.1
1.2
Description
.1
This section specifies the general requirements for blasting and rock
excavation for the production of granular materials in accordance with the
specification and to the lines, grades and dimensions indicated by the
Contract Documents or as required by the Engineer.
.2
Comply with all local, provincial and federal regulatory requirements.
.3
Obtain all necessary permits and licenses before beginning any blasting
work.
.4
Submit a blasting schedule an obtain approval from airport manager prior
to any blasting.
.5
Blasting shall not occur 30 minutes prior to or during aircraft movements
on the runway.
Related Sections
.1
1.3
Measurement for Payment
.1
1.4
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None specified.
To Section 01013 Measurement for Payment
Submittals
.1
Submit a general excavation plan covering the work areas for review at
least 14 days before start of the work. The plan shall show the general
blasting and excavation sequence, preliminary blasthole layout, hole
depths, loading, delays and related information necessary to evaluate the
blast design.
.2
Submit a warning plan for review at least 14 days before start of the work.
The plan shall contain a complete description of proposed procedures for
warning all personnel in the vicinity of any excavation that blasting is
about to take place, and to ensure that all personnel remain at a safe
distance immediately prior to, during and after a blast.
.3
Submit documentation of the qualifications and licensing of blasters and
blasting foremen prior to their employment on the work.
The
qualifications will be subject to approval.
Iqaluit Airport, Nunavut
Re-Opening of Taxi A and
Rehabilitation of Apron I
2005.11.30
Section 02321
Blasting / Rock Excavation
Page 2
.4
At least 24 hours prior to each blast submit to the Engineer for approval a
detailed plan for the blast. The plan shall indicate the drill hole pattern,
diameter and depth of drill holes, subdrill depth, type and weight of
explosive in each hole, type of detonators, delay pattern, any decking of
charges necessary to limit blasting vibrations and other such information
as the Engineer may require. Plans shall be modified based on the
results of previous blasts in the same area to control damage to the final
excavation slopes, to limit blasting vibrations, and to optimize
fragmentation for production granular material. Be prepared to make
further changes in the plan following each blast to optimize the results.
.5
Review of the Contractor's proposed blasting procedures does not relieve
the Contractor of its responsibility to protect existing facilities and
personnel, the work under construction and to repair any damage done
by the Contractor's blasting operations.
PART 2 - PRODUCTS
2.1
Explosives, Delay Devices and Blasting Mat
.1
Type recommended by explosives company and complying with local,
provincial and federal regulatory requirements.
.2
The use of ammonium nitrate fuel oil (ANFO) will not be permitted.
PART 3 - EXECUTION
3.1
3.2
Blasting - General
.1
Perform blasting in accordance with the best modern practice and
according to the approved plan using methods and techniques that will
avoid shattering or splitting of the rock beyond the excavation lines.
.2
Immediately following each blast, scale all excavated surfaces to remove
loose and unsafe materials.
.3
Blasting will be permitted only after it has been demonstrated to the
satisfaction of the Engineer that the proposed blasting will not cause
damage to existing structures, aircraft or the operation of the airport
.4
Where there is danger of causing damage by flying rock, blasts shall be
suitably blanketed and structures, aircraft and facilities in the vicinity
suitably protected.
Excavation and Over-excavation
.1
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Take all necessary precautions to preserve rock below and beyond the
designated excavation lines in an undisturbed condition. The Contractor
shall be fully responsible for damages caused to excavations or
foundations by blasting and other operations and shall repair all damages
at its own expense.
Iqaluit Airport, Nunavut
Re-Opening of Taxi A and
Rehabilitation of Apron I
2005.11.30
3.3
3.4
Section 02321
Blasting / Rock Excavation
Page 3
.2
Excavation for the future proposed taxiway shall not extend 0.5 metre
below the horizontal grade lines shown, except where authorized by the
Engineer.
.3
Excavation for the taxiway side slope clearances may extend outside of
the limits shown, but shall not exceed 1.0 metre.
.4
The maximum allowable depth of sub-drilling below the design excavation
grade for the future proposed taxiway is 0.5 metres. The Contractor shall
provide adequate elevation survey control to verify the actual depth of
subdrilling.
Rock Excavation – Mechanical Method
.1
Excavate rock using mechanical methods.
.2
Cut away rock at bottom of excavations to form level bearing that follows
natural strata.
.3
Remove final layers carefully to provide sound and unshattered base.
.4
Remove boulders and fragments that may slide or roll into excavated
areas.
Rock Excavation – Explosives Method
.1
Excavate rock by blasting in accordance with requirements of contract
documents.
.2
Post guards and sound warnings when blasting is to take place.
.3
Disintegrate rock and remove from excavations.
.4
Cut away rock at bottom of excavations to form level bearing that follows
natural strata.
.5
Remove shaled layers to provide sound and unshattered base.
END OF SECTION
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