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Copyright 2007 M.R. Martin Construction Inc.
10.1 General
10.1.1 This specification shall cover all work necessary to install pipe by Auger boring. This includes instances, where required, to avoid excavation in paved surfaces, sensitive restoration areas, where traffic congestion is prevalent or when specifically requested by authority having jurisdiction.
10.1.2 This specification shall cover installations of polyethylene and steel pipe up to NSP 12.
10.1.3 Where Auger Boring equipment is used, an instructor qualified by the manufacturer shall have trained the equipment operator. The Contractor shall provide adequate proof of operator training when requested by the owner. Where such work is sub-contracted, the same requirements will follow.
10.1.4 The contractor shall provide all labor, equipment, lubricants and instrumentation necessary to complete the work where ABM is being utilized.
10.1.5 The contractor shall obtain in advance stakeouts for all other buried utilities. For bores less than 30m in length, minimum horizontal and vertical clearances shall be maintained. Clearance shall be measured from the nearest edge of the largest cutter or back reamer, to the nearest edge of the utility. Utility exposure holes are mandatory when crossing all buried utilities i.e. opening of utility covers. For bores not within a 1m radius of any utilities, exposure holes are deemed as optional.
10.1.6 The contractor shall obtain in advance stakeouts for all other buried utilities
For bores greater than 30m in lengths, minimum clearances from other utilities shall be increased. A minimum of 450mm horizontal and 150mm vertical clearance shall be maintained. Clearance shall be measured from the nearest edge of the largest cutter or back reamer, to the nearest edge of the utility. Utility exposure holes are mandatory when crossing all buried utilities i.e. opening of utility covers. For bores not within a 1m radius of any utilities, exposure holes are deemed as optional.
10.1.7 ABM crossings of highways and railways shall be carried out in accordance with the applicable requirements of the authority granting permission for the bore.
10.1.8 The contractor shall verify soil type by any means up to and including digging test holes and provide such information to the owner, upon request, prior to boring.
10.1.9 Where the owner assesses that the soil type will be unsuitable for pipeline integrity, the contractor shall utilize other methods to install the product.
10.1.10 Boring shall follow a straight line. Alignment and cover shall not deviate from the required bore path. Where ABM equipment is being used, the contractor shall predetermine the maximum alignment and cover deviation.
10.1.11 The contractor shall provide special care to ensure no damage occurs to the pipe where it is pushed/ jacked into bore holes.
10.1.12 Pipelines will be installed by simultaneously jacking pipe through the earth while removing the spoil inside the encasement by means of rotating the auger assembly.
10.1.13 the contractor will have at his disposal a Ground Condition Chart for consultation
based on the soil conditions.
10.1.14 Where ABM equipment requires the use of grounding mats or any other special
equipment, they shall be used.
10.2 Environmental
10.2.1 The contractor shall take any and all necessary precautions to minimize
environmental damage associated with the set-up and use of ABM equipment.
10.2.2 The contractor shall abide by all applicable environmental requirements of the
authority granting permission to bore.
10.2.3 Bentonite and Polymers shall be the only approved lubricants permitted for
ABM applications. Any additives used shall be chemically inert, biodegradable and non-toxic. No petroleum-based additives shall be permitted. No detergent additives shall be permitted where polyethylene pipe is installed. Lubricants can be pumped to and around the leading section of the pipe and when conditions require to other locations along the surface of the casing, to reduce friction.
10.2.4 Upon request, the contractor shall furnish to the owner, copies of available MSDS
(Material Safety Data Sheets), for any drilling lubricants used.
10.2.5 The contractor shall contain the drilling lubricants where there is a possibility of
ponding or runoff into watercourses, ditches, drains and/or sewers. Applicable methods of containments include sand bags and polyethylene sheets, containment rings or absorbents booms, Vacuum trucks or site regarding (berms).
10.2.6 Where leakage of drilling lubricants occurs along the bore path, the contractor
shall take any and all necessary steps to minimize the impacts. Applicable methods of containments include reducing the pressure of the slurry flow, reducing the speed of the drill rotation, reducing the speed of the auger advancement or moving the drilling location. The contractor shall be responsible for any settlement and heavy damage along the bore path.
10.2.7 The contractor shall be responsible for the disposal of the drilling lubricants. The disposal shall be in accordance with all applicable government agencies requirements. The owner reserves the right to randomly test the drilling lubricants for contamination.
10.2.8 Contaminated lubricants shall be disposed of at an approved hazardous waste site. Non-contaminated lubricants shall be disposed of at an approved landfill site or an alternate approved site as arranged by the contractor.
10.3 Pit Preparation
10.3.1 The boring operation should proceed from a work pit that will adequately and safely accommodate the auger boring equipment, materials and workman. When pits are cut into the sides of the embankment or beyond it, the face and sides of the pit should be properly sloped or sheeted and braced.
10.3.2 Care be taken so that the traveling public, integrity of the road surface and the safety of the workers are not endangered.
10.3.3 When needed, a shield should be used to protect the working face to avoid cave-ins and voids from developing around the working face.
10.3.4 The thrust or backstops opposite the working face should be adequate to handle the installation of the encasement (the pushing forces). This should be constructed in line with the line of thrust.
10.3.5 Preparation of the floor of the pit i.e. dirt, stone, concrete slab etc, will be decided by the length, size and duration of the job.
10.3.6 When water is present, known or anticipated, a dewatering sump pump system of sufficient capacity to handle the flow should be installed and maintained at the site until the operation can be safely halted or the job is completed.
10.4 Experience
10.4.1 Each auger boring crew shall have a reasonable preparation of experience men.
A superintendent or lead hand experience in auger-boring methods and techniques representing the contractor should be present at all times while work is proceeding. He shall also be responsible for frequent checking of the line and tolerances. Tolerance shall be agreed to in light of the gradient requirements.
10.5 Skin Friction
10.5.1 If conditions warrant, lubricants can will be used to reduce the skin friction on the
casing, therefore reducing the thrust required to push the pipe through the strata.
10.5.2 should skin friction become an issue there are two proven ways to deal with this
situation. Depending on the ground conditions, you can over cutting the bore path or lubricate the casing. These methods will be used separately or in combination with each other.
10.6 Line and Grade Tolerances
10.6.1 The line and grade of the pipe or casing will tend to continue through the bore
the same as it was originally set-up on the machine in the pit, unless the pit has been affected by some outside force.
10.6.2 Line and grade tolerances will be maintained by pushing and open ended
casing to collect the spoil or any obstruction. Obstructions larger than the casing will be cut through and the spoil created colleted by the casing.
10.6.3 line and grade tolerances can also be met by increasing the diameter of the bore to
a larger size than was originally planned. Upon completion of the bore, the carrier pipe is inserted through the oversized hole, positioned in place to the correct line and grade and then blocked and secured in place. The void between the two can be filled if needed but is not required. The oversized bore also makes it easier to remove oversized obstructions if needed.
ABM Sample Specifications
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