Pile foundation underpinning method for building foundation adjacent to deep foundation pit

Abstract

The invention relates to the technical field of civil engineering foundation reinforcing of industrial and civil construction projects, in particular to a pile foundation underpinning method for a building foundation adjacent to a deep foundation pit. The method includes the steps of firstly, investigating and designing, to be more specific, investigating the existing building, selecting foundation underpinning pile types according to building foundation size, buried depth, distance between the building foundation and the deep foundation pit and the depth of the deep foundation pit, calculating to determine the required length and number of foundation underpinning piles according to bearing capacity, allowing the foundation underpinning piles to exceed the depth of the bottom of the deep foundation pit, and completing ring beam design; secondly, pressing the piles at the edges of the building foundation; thirdly, performing pile foundation underpinning on the building foundation. The method has the advantages that the building foundation satisfies the requirements of bending resistance, punching resistance and shearing resistance by the aid of pile foundation underpinning, natural foundation bearing of the building foundation is changed into pile foundation bearing, additional load of the building foundation to the deep foundation pit is lowered greatly, sedimentation and horizontal displacement of the building foundation adjacent to the deep foundation pit are solved, and factory building safety is guaranteed.

Description

technical field [0001] The invention relates to the technical field of civil foundation reinforcement for industrial and civil construction projects. Background technique [0002] In recent years, with the rapid development of my country's economic construction and the requirements of market competition, the existing production process is facing more and more requirements for technological transformation and upgrading; because most of the transformation requires that the existing production facilities in the old factory building not stop production, close to the factory building In complex environments such as column foundations and very narrow spaces, the construction of traditional bored piles and diesel hammer (or static pressure) prefabricated concrete piles cannot be implemented due to the limitations of the factory building. The main manifestations are: the deep foundation pit adjacent to the inner column foundation of the factory building, affected by factors such as t...

AI Technical Summary

Problems solved by technology

At present, the commonly used pile foundation underpinning technology mainly adopts the method of drilling and jacking steel piles on the original foot of the foundation. Due to the influence of the structure's own weight and the impact of the jack press frame, the depth of the underpinning pile is shallow and the bearing capacity is low, and drilling on the foot of the foundation The hole will damage the foundation itself, and the construction efficiency is very low

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