compacted as provided in paragraph BACKFILLING. When removal of unstable
material is due to the fault or neglect of the Contractor while performing
shoring and sheeting, water removal, or other specified requirements, such
removal and replacement shall be performed at no additional cost to the
Government.
3.2
BEDDING
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NOTE: It should be noted that pipe cover
requirements will be different for different types
of bedding.
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The bedding surface for the pipe shall provide a firm foundation of uniform
density throughout the entire length of the pipe.
3.2.1
Concrete Pipe Requirements
When no bedding class is specified or detailed on the drawings, concrete
pipe shall be bedded in a soil foundation accurately shaped and rounded to
conform to the lowest one-fourth of the outside portion of circular pipe or
to the lower curved portion of pipe arch for the entire length of the pipe
or pipe arch. When necessary, the bedding shall be tamped. Bell holes and
depressions for joints shall be not more than the length, depth, and width
required for properly making the particular type of joint.
3.2.2
Clay Pipe Requirements
Bedding for clay pipe shall be as specified by ASTM C 12.
3.2.3
Corrugated Metal Pipe
Bedding for corrugated metal pipe and pipe arch shall be in accordance with
ASTM A 798/A 798M. It is not required to shape the bedding to the pipe
geometry. However, for pipe arches, the Contractor shall either shape the
bedding to the relatively flat bottom arc or fine grade the foundation to a
shallow v-shape. Bedding for corrugated structural plate pipe shall meet
requirements of ASTM A 807/A 807M.
3.2.4
Ductile Iron and Cast-Iron Pipe
Bedding for ductile iron and cast-iron pipe shall be as shown on the
drawings.
3.2.5
Plastic Pipe
Bedding for PVC and PE pipe shall meet the requirements of ASTM D 2321.
Bedding, haunching, and initial backfill shall be either Class IB or II
material.
3.3
PLACING PIPE
Each pipe shall be thoroughly examined before being laid; defective or
damaged pipe shall not be used. Plastic pipe shall be protected from
exposure to direct sunlight prior to laying, if necessary to maintain
adequate pipe stiffness and meet installation deflection requirements.
Pipelines shall be laid to the grades and alignment indicated. Proper
facilities shall be provided for lowering sections of pipe into trenches.
SECTION 02630
Page 30
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