Foundation pit supporting method with double rows of piles

Abstract

The invention discloses a double-row pile foundation pit supporting method, wherein double-row piles are as follows: a front row of piles are inclined to the outside of the foundation pit and a rear row of piles are vertical. The method comprises the following steps: (a) the inclination angle of the front row of piles, the pile length and the pile shaft strength of the front row of piles and the rear row of piles, the space between the front row of piles and the rear row of piles, and the excavation progression of the foundation pit are determined according to the site condition and computational analysis; (b) the cross section, reinforcing ribs and the space of connection beams between the front row of piles and the rear row of piles are determined; (c) the front row of piles and the rear row of piles are constructed; (d) connection beams between top beams on the top of row piles and the row piles are constructed; (e) the foundation pit is excavated; and (f) the bottom of the foundation pit is cleaned and leveled and subjected to further construction. The double-row pile foundation pit supporting method can avoid arrangement of an inner support and an anchor rod to a large degree, is suitable for soft soil and various soil conditions, and can reduce the top displacement of small piles, the bending moment of pile shafts and the construction cost, increase the excavating depth and reduce possibility of causing toppling failure.

Description

technical field [0001] The invention relates to the field of foundation foundations, in particular to a method for supporting foundation pits by using double rows of piles. Background technique [0002] The double-pile row support structure has many advantages such as simple construction technology, low cost, avoiding pit support, and providing convenient operating conditions for excavation construction. It is one of the emerging forms of foundation pit support at home and abroad. The support structure of double-row piles is generally cantilever type, and the foundation pit does not need to be equipped with internal supports and anchors. [0003] In the current double-row pile support structure, vertical piles are used for the front and rear rows of piles. The common problem when using vertical piles for foundation pit support is that the pile tops are prone to large displacements, resulting in the piles outside the foundation pit. Large deformation of the ground will endan...

AI Technical Summary

Problems solved by technology

[0003] In the current double-row pile support structure, vertical piles are used for the front and rear rows of piles. The common problem when using vertical piles for foundation pit support is that the pile tops are prone to large displacements, resulting in the piles outside the foundation pit. Large deformation occurs on the ground, endangering the surrounding environment; 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; the excavable depth of the foundation pit is small, and it is easy to overturn when the excavation depth increases

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