Pipe Jacking Intermediate Jacking Stations
Pipe Jacking Intermediate Jacking Stations
(OP)
I am working on a pipe jacking project that has jacking forces of over 750 ton with less than 3' of cover over pipe. Conventional backwall systems are not enough, so we are looking to reduce jacking forces on the reaction wall by use of intermediate jacking stations.
How do you calculate the reduction in jacking forces in the pit, by use of a IJS?
How do you calculate the reduction in jacking forces in the pit, by use of a IJS?






RE: Pipe Jacking Intermediate Jacking Stations
RE: Pipe Jacking Intermediate Jacking Stations
RE: Pipe Jacking Intermediate Jacking Stations
RE: Pipe Jacking Intermediate Jacking Stations
How could you do anything so vicious? It was easy my dear, don't forget I spent two years as a building contractor. - Priscilla Presley & Ricardo Montalban
RE: Pipe Jacking Intermediate Jacking Stations
RE: Pipe Jacking Intermediate Jacking Stations
RE: Pipe Jacking Intermediate Jacking Stations
If I read the process correctly, he's going to have a buried pipe, pushed from one end that's exposed in a pit or evacuated hole, to ram it sideways a short distance until the buried pipe butts up against an existing pipe, already exposed in a different hole. Right?
I'm assuming the problem will be "restraining" the pipe from bending "up" through that little bit of cover through compressive forces (like an unrestrained column would collapse from end pressure). If the pipe were shorter, fatter, stiffer walled, more deeply covered, or needing less force to be rammed sideways (lubricated somehow, or being rammed through less resistant soil), then the threat of sudden collapse would be reduced, right?
RE: Pipe Jacking Intermediate Jacking Stations
In addition you will disturb that shallow depth of three feet of overburden. Pavement will be disturbed, utilities...etc. This installation seems ideal for cut and cover, open trench. Obviously we do not know the full story as I do not understand why this installation would be considered for a pipe jacking.
RE: Pipe Jacking Intermediate Jacking Stations
RE: Pipe Jacking Intermediate Jacking Stations
RE: Pipe Jacking Intermediate Jacking Stations
Although I dont think your main issue will be settlement but heave, as you thrust the pipe it is pushing soil inall directions at the front including upward.
The thrust blocks rely on passive resistance to work and I cannot see you getting those sorts of loads at such a shallow depth.
I also fail to see how this could be cheaper than open cut at such a shallow depth.
RE: Pipe Jacking Intermediate Jacking Stations