Single row of Larsen steel sheet pile cofferdam is usually composed of Larsen steel sheet pile wall, internal support or pull anchor and so on. The following by the Pan Lu Larsen steel sheet pile of engineers to introduce a single row of Larsen steel sheet pile cofferdam design method.
Larsen steel sheet pile between the adjacent support and the bottom road support below the steel sheet pile as a simple support! Larsen steel sheet pile hit a certain depth to produce sufficient passive resistance. When the Larsen steel sheet pile coffers support more than two, due to the Larsen steel sheet pile into the soil depth is insufficient, it is difficult to produce enough of the press pressure and the dam body is still stable, the bottom of the Larsen steel sheet support the following pull Mori steel sheet pile as a cantilever beam, which will lead to the load on the bottom road support is too large, should try to avoid this situation.
In any case, the Larsen steel sheet pile below the excavation surface should have sufficient depth of soil to control the infiltration of groundwater into the cofferdam. Piling process, you should always record the Larsen steel sheet pile may be signs of tripping. In some cases, it is also necessary to spray the slurry after the pile to control the seepage. Can be used cantilevered sheet pile cofferdam, but with the cantilever retaining wall has the same limitations, retaining water (soil) height is limited.
When the surface size of the Larsen steel sheet pile cofferdam is large, but the depth is relatively shallow, set the brace or external anchor spin economy. The use of anchor will occupy the cofferdam external space, and perhaps also need to get the consent of the owners to install.
For the depth of more than 3m cofferdam, usually using steel or special support of the internal support system.
Larsen steel sheet pile cofferdam
Each design phase should accurately reflect the construction process. Typical Larsen steel sheet pile cofferdam construction process: excavation and precipitation to the first support surface below, and then install the first support; Dong Fu above the process to support the next installation. For the water Larsen steel sheet pile cofferdam, it is necessary to pay attention to the stress produced in the process of precipitation and support installation may be greater than the stress generated at the end of the cofferdam donor, and the Larsen steel sheet pile coffer in the water is recommended to use a special lock sealant. When the Larsen steel sheet pile cofferdam is used only for retaining water and the excavation depth of the soil is small, the most advantageous approach is to install all the support underwater before the precipitation.
In order to facilitate the closure of the Rosen steel sheet pile cofferdam, the two pieces of Larsen steel sheet pile at the close should be a high and a low, often close to the next small (the bottom of the soil with the squeeze, the top is free) The situation is that it can be used to pull the two sides to the two sides to pull the two sides, so that the closure of the two sides of the roof of the Lusen steel sheet pile is equal to the distance between the width of the Larsen steel sheet pile, close to the parallel, the He Long pile into the Design elevation.
Then there is a square Larsen steel sheet pile cofferdam has four faces, finished each piece of steel sheet pile is to follow the direction of the guide line with the tangential direction perpendicular to the closure should be selected in the vicinity of the corner pile, if the distance The gap, you can adjust the side of the adjacent side of the distance from the guide frame. Mainly to prevent the closure of the two pieces of the pile is not in a plane, so we must adjust the direction of the good piles, is a side of the lock with the opposite of the Larsen steel sheet pile lock as far as possible to keep parallel.