we are facing problems like landsliding, mud forming while excavation, ground water seapage, and continious flow of water. We are also not able to stop water also from existing drainage line. last three months we are doing this job, but not able to lay single pipe. We had also used chain mounted machinery like hitachi 200 also but no result ! as and when we lift earth, more earth is sliding from sides forming mud and we are not able to perform replacing pipe. Please give me information regarding how to prevent landslide and how to lay 18" RCC Hume pipes in mud ? Is there any construction chemicals available to prevent ground water seapage ?
2006-12-21 03:56:14 · 4 answers · asked by hertzvadodara 2 in Science & Mathematics ➔ Engineering
First off..WHERE IS YOUR CRIBBING????
You should NOT have landslides if you have proper cribbing! (Thats the infrastructure of pipes and boards that make a man "safe" from landslides! Sheesh! I hope your not doing this with out it...OSHA would shut you down in a second!!
Also, where is your sump pump? Your getting water seepage, what about laying down a base of gravel and having a sump pump in the trench?
You are not going to prevent ground water seepage at that dept... and no, you cant put a chemical on the "mud" to stop it.. only frozen mud may stop the water from coming up, but, its going to take a while for the ground to freeze...(And then, if you have artesian springs, you are never going to get it to freeze up so that it stops). Thats what the pumps are for...hmmmm
Get yourself an Engineer to over see this job, apparently your 'Foreman' needs replaced!!
I wish you well..
Jesse
2006-12-21 04:17:53 · answer #1 · answered by x 7 · 1⤊ 0⤋
DITTO to Jesse!
30' is an extremely deep trench to be fooling around in.
Who the hell is paying the bill for you to be out there 3 months with no production?
You can't lay pipe in mud. The plans I am sure call out some sort of bedding rock and grade tolerances. This sounds like a slap-a-whore project. I would run from this contractor and never look back. Do not go back down into that trench unles you have a minimum 1:1 side slopes for the trench or approved cribbing.
2006-12-21 19:57:20 · answer #2 · answered by daedgewood 4 · 0⤊ 0⤋
Large quantities of bentonite can be used to stop the seepage coming into the excavation. You can generally get it by the bag from any well drilling company. Please evaluate the safety of your excavation. Obviously if you are 30 feet deep, you must have over excavated the hell out of the trench. Very few soil classes will hold a trench to 30' deep. Depending on the length of your pipe run, it may be practical to drive sheet piling. This will provide for a safe excavation, and also help seal out groud water infiltration.
2006-12-21 22:03:29 · answer #3 · answered by questionable reality 3 · 0⤊ 0⤋
You might have to drive sheet piling down, excavate, install some pipe, keep driving more piling, and pulling out first piling as you go.
Of course the arrangement needs some engineering, both for constructability and safety. For one thing, I wouldn't want anyone in the trench when any operation except laying pipe is underway.
An interesting question is why you are working so far below grade.
2006-12-21 23:19:09 · answer #4 · answered by Ed 6 · 0⤊ 0⤋