Supporting system and supporting method of slant cement soil mixing pile foundation pit

Abstract

The invention discloses a supporting system of a slant cement soil mixing pile foundation pit. The supporting system comprises a slant gravity wall, a cement soil supporting wall where structural steel or precast piles are slantly inserted, double rows of slant pile supports, double rows of pile supports and a gravity and slant supporting combined gravity wall, wherein one row of pile support is straight, and the other row of pile support is slant. In the slant gravity wall, vertical cement soil mixing piles are changed into cement soil mixing piles with certain angles. In the supporting wallwhere structural steel (or precast piles) is (or are) slantly inserted, the structural steel (or precast piles) is (or are) added into the slant cement soil mixing piles. In the double rows of slant pile supports or the double rows of pile supports, two rows of piles are connected through a crown beam. In the gravity and slant supporting combined gravity wall, the slant cement soil mixing piles are driven into one side of the slant gravity wall or the traditional vertical gravity wall to serve as supporting of the gravity wall. According to the supporting system, pile top displacement is reduced to a large degree, the pile body bending moment is reduced, the supporting engineering cost is reduced, the excavation depth is increased, and meanwhile the possibility that overturn damage happensto the foundation pit is reduced.

Description

technical field [0001] The invention relates to a method for supporting a foundation pit, in particular to a method for supporting a foundation pit by adopting oblique cement-soil mixing support. Background technique [0002] Gravity wall and row pile support wall are currently the most widely used forms of foundation pit support in China. The piles are all vertical piles. The main disadvantages of using vertical piles for row pile support are: first, the same The displacement of the pile top at the excavation depth is large, and the internal force is large, which causes a large deformation of the ground behind the pile and endangers the surrounding environment. Second, when the strength of the piles is not enough, it is easy to cause the slope protection piles to break and make the foundation pit unstable. If the excavation depth of the foundation pit is large, it is easy to overturn and fail, so the support structure needs a larger cross-section and insertion depth. There...

AI Technical Summary

Problems solved by technology

[0002] Gravity wall and row pile support wall are currently the most widely used forms of foundation pit support in China. The piles are all vertical piles. The main disadvantages of using vertical piles for row pile support are: first, the same The displacement of the pile top at the excavation depth is large, and the internal force is large, which will cause a large deformation of the ground behind the pile and endanger the surrounding environment

Second, when the strength of the pile is not enough, it is easy to cause the slope protection pile to break and make the foundation pit unstable. If the excavation depth of the foundation pit is large, it is easy to overturn and fail, so the support structure needs a larger cross-section and insertion depth

Images