Adjust Cutting of the pipe
Chain cutter can be used at the site to cut pipes up to 450mm in diameter. Smaller diameters (i.e. 100 and 150mm) can be cut by using cutting ring.
How to use cutting chain
1 - Adjust the chain at the required length of the pipe for cutting.
2 - Tight the chain around the pipe and buckle it up with arm of the cutter and fold back the surplus chain (as shown).
3 - Tighten up the chain by turning the horizontal handle (as shown) till the pipe is cut.
a) Initial backfilling
Initial backfilling means backfilling around the pipe carefully placed up to 12" (300mm) above the pipe so as not to disturb the final alignment and to protect the pipe from damage during the final backfilling. Hand damped should only be applied at this stage. Bedding material should be sliced under the hunches to fill in the voids in this area.
b) Final backfilling
Should be done in layers and big stones should be avoided, mechanical compactors not to be used unless a considerable depth of layers has been done.
Care should be taken in lowering the pipe into the trench to prevent damaging the joint material or disturbing trench condition. Never allow the pipe to be dragged along the ground or even at the trench bottom.
Manufacturer's recommendations are advised to be followed before joining:
a) Lubricate both join surfaces socket and spigot (Surfaces should be clean and free from dust)
Use SVCP lubricant only.
b) Prepare trench bedding in proper way make sure its homogeneous, leveled and dry (no water table)
c) Line up the socket and spigot and shave the pipes together with a steady pressure, (for small diameters this can be done by hand while for larger sizes, a bar may be used). Care should be taken not to damage the lip of the socket by using a wooden block. Special device may be used for big diameters.
d) Laying pipes should be in the upstream direction with the bell end laid upstream.
e) Holes must be dug at each socket (bell hole) to make sure that the pipe barrel is resting firmly on the trench bottom or bedding material so that the load is supported by the pipe barrel not the pipe socket
f) Yellow marks printed at the external side of the pipes should be kept always at the crown. (aligned with other yellow marks of the pipes).
Tips for laying sewer pipes