Soil displacement method
The soil displacement process is a process for laying pipes underground with lengths of up to 25 m. Soil displacement hammers are also called soil displacement hammers because of their rocket- like shape .
Procedure
To start the rocket, a start and a target pit have to be dug. The dipstick in the target pit is sighted using DF optics. Then the earth- moving rocket is adjusted in height and side in the mount . The soil displacement hammer is propelled with compressed air from a construction site compressor. An underground cavity is excavated. The prerequisite for this is that the soil can be displaced.
Sleeveless short or long pipes up to DN 160 made of plastic or metal can be pulled in directly or after drilling.
Accuracy
The most important property of a soil displacement hammer is its accuracy. Therefore a distinction is made between two earth rocket systems:
- The piston hits the housing and thus drives the entire rocket forward in one push (rigid system).
- The piston first hits a movable chisel head and then hits the housing. The rocket is moved forward in two steps. This process is called the 2-step process and is considered to be particularly accurate (see picture on the right).
scope of application
With this method, traffic routes can be crossed and house connections established without continuous digging. It is used for gas , district heating , water , sewage, FTTH and telecommunications .
Special application area:
- as a ram for steel pipe jacking,
- as a bursting machine for pipe renewal,
- for anchorages and
- for the removal of old steel pipes.
Details
- Soil displacement hammers reach (depending on the soil) an advance speed of up to 15 m / h.
- The holes are usually up to 15 m long.
- Soil displacement hammers are equipped with a reverse gear.
- It is possible to locate the rocket so that the progress of the advance can be precisely followed from the surface. However, only monitoring is possible; the soil displacement hammer cannot be controlled.
literature
- Dietrich Stein: Trenchless line construction . Ernst & Sohn , Berlin 2003, ISBN 3-433-01778-6 ( limited preview in the Google book search).
- Abwassertechnische Vereinigung: Pipe jacking. ATV waste water regulations, worksheet 125 . Ges. To promote d. Abwassertechnik, Hennef 1996, ISBN 3-927729-43-4 .
See also
- Alternative methods for trenchless pipe laying: