Why should the pile foundation be excavated after the pile driving?
If it is high-level, there are first excavation to the bottom of the foundation and then piling
Pile foundation construction shall be checked and accepted before earthwork construction!
It is convenient to measure and locate the center of the pile, and also facilitate the approach of the piling machine
The construction of the pile foundation shall be done by piling and excavating the earth as follows:The first excavation, construction and basement, excavation depth from plus or minus 00 may have a depth of 4 meters, 4 meters below the ground, the general quality is difficult to ensure, at this time it is difficult to support the ground operation requirements, especially when the mechanical operation. It is difficult to estimate the change of groundwater, the coming of rainy season, and the cost and time of these external factors will be played directly as compared with the original ground.In general, the plant should dig the earth before the foundation pit is supported, and then the pile will be made. Concrete car can be outside the pit, by pouring over to the bottom of the pit. Of course, if the surface of the excavation is silt layer / or below the shallow water level is special. If the deep foundation pit is used, it is better to dig the soil first and then make the pile, so the concrete pouring is not a problem.The soft soil area must have been dug before and after, for a very simple reason. Soft soil generally has a hard surface layer, so that it is conducive to the movement and construction of pile foundation. If there is no hard surface on the surface, then make the cast-in-place bottom and then pile the pile. In addition, the foundation pit supporting in the soft soil area is a relatively difficult and easy to occur accident process, and the construction grouting pile will certainly affect the excavation and support of basement, and the mud pool will not know where to put it.
The general construction of pile foundation is the basic to the pile of soil by mechanical or artificial (gravel pile is discharged by extrusion) of earthwork digging a lot, if the first operation is likely to damage the basal layer of base bearing capacity requirements of earth will also affect dug the basement level! After excavation, the construction schedule will be accelerated and the quality hidden from the long exposure of the basement will be reduced!
