A foundation pit support structure supported by inclined pile walls and its construction method

Abstract

The invention discloses an inclined pile wall bearing type foundation pit support structure. The inclined pile wall bearing type foundation pit support structure is characterized by comprising an inclined pile wall, a bearing pile and a crown beam, the inclined pile wall is obliquely arranged, the top of the inclined pile wall is inclined towards the interior of a foundation pit, the bottom of the inclined pile wall obliquely enters a soil body outside the foundation pit, the bearing pile is vertically arranged below the top of the inclined pile wall, the top of the bearing pile and the top of the inclined pile wall are connected, and the bottom of the bearing pile is arranged in the soil body at the bottom of the foundation pit. Compared with the prior art, the inclined pile wall bearing type foundation pit support structure has the following beneficial effects that a horizontal diagonal brace system in the pit is eliminated, a good plane operation space is provided for foundation pit earth excavation and basement structure construction, the construction efficiency is greatly improved, and the manufacturing cost is saved; and a horizontal anchor cable anchored in the soil body outside the pit is eliminated, and the problem that the anchor cable exceeds the property line and infringes rights is solved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a foundation pit support structure supported by inclined pile walls in a temporary foundation pit support method and a construction method thereof. Background technique [0002] For deep and large foundation pits with large plane size and large excavation depth, the foundation pit support methods currently used in China mainly include: internal support support structure, pile-anchor support structure, and double-row pile support structure. [0003] The internal support structure and the surrounding enclosure structure of the pile-anchor support structure are generally arranged along the periphery of the foundation pit with vertical column row piles, underground diaphragm walls, reinforced cement-soil walls or occlusal piles, etc. [0004] The planar layout forms of the internal support of the internal support structure mainly include: grid pattern, opposite truss, ...

AI Technical Summary

Problems solved by technology

[0017] Although the double-row pile support structure significantly enhances the rigidity of the enclosure structure through the "gate-type" structure, increases the height of the cantilever support, and eliminates the adverse effects of internal supports or anchor cables, but its acceptance mechanism is still a cantilever beam. When the depth of the foundation pit is deep or the soil quality is poor, the horizontal lateral pressure is very large, the diameter of the double-row piles needs to be large, the cost is high, and it is difficult to strictly control the deformation

[0018] In addition, due to the installation of two rows of piles at the front and back, there is a large demand for a flat site, and it is difficult to implement when the excavation surface is close to buildings and structures.

Images