METHOD OF STATEMENT OF
UNDERGROUND PIPE INSTALLATION
Material to be used:
- NEPRO / PIPES: Approved (Trans # M-088)
- NAMAT-PVC FITTINGS: Approved (Trans # M-076)
Summary: This Method of Statement includes all the underground sewer pipe installation.
1. Procedure
- Excavate trenches to provide a clearance 300mm on each of the pipe.
- Bedding to be compacted in layers not exceeding 150mm to give uniform bed.
- Lay the pipe directly on the bedding.
- The pipes must be installed as indicated on the approved shop drawing with the required invert level and proper slope using the approved materials and fittings.
- Trench is not to be open too far in advance of pipe laying and then backfilled as soon as possible (24 hours max.)
- Use fine sand and compact fill firmly between the side of the pipe and the trench.
- Brick or hard materials under the pipe are not allowed to be used.
- Provide a warning tape along the pipe and below the upper layer of the sand.
- Until the crown of the pipe is covered by at least two feet of a tamped sand, considerable care shall be exercised in the back filling of trenches.
- The underground pipe must comply with the manufacturer recommendations for laying the underground pipes.
