sewerage and drainage project

Hi Sunil

You will probably find that there is no critical path on such a project as there are too many things going on that are independent of each other but only come together for final test and commissioning.

The only critical factor could be resource loading.

The general rule is:

Start at the bottom and work up the slope

Place manholes over the laid pipe

Run house connections upwards to the houses after the manholes are in place.

Start the pumping station ASAP - particularly if the piles need a 28 day load test -  and don't forget the eletrics.

Best regards

Mike Testro

Hi Mike,

Thx for thie reply, it was very much informative.

Regards

Sunil.

some points i can share, divide your sewerage area into sub networks; if your project is large it may have more than 2 pumping stations. Separate your network for the force mains, from the gravity sewers. Study the plan and profile; generally works should start from the lowest pumping station, going up. Dewatering pumps may be required in deep trenches., including provisions for shoring  Some contractors lay the manholes first ahead of the pipes; some lay the pipes first, and install the manhole later. To expedite work, most manholes are precasted at the yard. As gravity sections are progressed, the work at some point will have to install the inspection chambers and house connections.

A good queston for you would be, why would be the reasony why laying the gravity sewers should start from the bottom going up?

Start from the bottom and work up because the that is the line of the Male - Female  joints in the pipes. If they were laid the other way they would leak.

It is easier to install the manholes on top of the pipes because if the pre installed manhole base is a few mm out of level then the gravity flow would be affected.

Best regards

Mike Testro

Sofi,

Thx for sharing your views, it was very much useful..

Regards

Sunil.