Lifting lugs in vertically elongated metal pipe shall be placed in the same
vertical plane as the major axis of the pipe. Pipe shall not be laid in
water, and pipe shall not be laid when trench conditions or weather are
unsuitable for such work. Diversion of drainage or dewatering of trenches
during construction shall be provided as necessary. Deflection of
installed flexible pipe shall not exceed the following limits:
MAXIMUM ALLOWABLE
TYPE OF PIPE
DEFLECTION (%)
Corrugated Steel and Aluminum Alloy
5
Concrete-Lined Corrugated Steel
3
Ductile Iron Culvert
3
Plastic
7.5
Not less than 30 days after the completion of backfilling, the Government
may perform a deflection test on the entire length of installed flexible
pipe using a mandrel or other suitable device. Installed flexible pipe
showing deflections greater than those indicated above shall be retested by
a run from the opposite direction. If the retest also fails, the suspect
pipe shall be replaced.
3.3.1
Concrete, Clay, PVC, Ribbed PVC, Ductile Iron and Cast-Iron Pipe
Laying shall proceed upgrade with spigot ends of bell-and-spigot pipe and
tongue ends of tongue-and-groove pipe pointing in the direction of the flow.
3.3.2
Elliptical and Elliptical Reinforced Concrete Pipe
The manufacturer's reference lines, designating the top of the pipe, shall
be within 5 degrees of a vertical plane through the longitudinal axis of
the pipe, during placement. Damage to or misalignment of the pipe shall be
prevented in all backfilling operations.
3.3.3
Corrugated PE Pipe
Laying shall be with the separate sections joined firmly on a bed shaped to
line and grade and shall follow manufacturer's recommendations.
3.3.4
Corrugated Metal Pipe and Pipe Arch
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NOTE: Coordinate with paragraph Corrugated Steel
Pipe.
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Laying shall be with the separate sections joined firmly together, with the
outside laps of circumferential joints pointing upstream, and with
longitudinal laps on the sides. Part paved pipe shall be installed so that
the centerline of bituminous pavement in the pipe, indicated by suitable
markings on the top at each end of the pipe sections, coincides with the
specified alignment of pipe. Fully paved steel pipe or pipe arch shall
have a painted or otherwise applied label inside the pipe or pipe arch
indicating sheet thickness of pipe or pipe arch. Any unprotected metal in
SECTION 02630
Page 31
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