Underpinning Method of Pile Foundation Adjacent to Deep Foundation Pit of Building

Abstract

The invention relates to the technical field of civil foundation reinforcement for industrial and civil construction projects. Step 1, investigation and design: investigate the existing buildings, select the type of foundation underpinning piles according to the size of the foundation of the building, the depth of embedding, the distance between the foundation of the building and the deep foundation pit, and the depth of the deep foundation pit. Force calculation to determine the length of the required foundation underpinning piles, the number of foundation underpinning piles, the depth of the foundation underpinning piles exceeding the bottom of the deep foundation pit, and finally complete the design of the ring beam; step 2, building foundation side pressure piles; step 3, building Pile foundation underpinning construction of material foundation. The invention enables the building foundation to meet the requirements of bending resistance, punching resistance and shear resistance through pile foundation underpinning, and converts the natural foundation bearing capacity of the building foundation into pile foundation bearing, greatly reducing the additional load of the building foundation on the deep foundation pit. load, solve the settlement and horizontal displacement of the foundation of the building near the deep foundation pit, and ensure the safety of the factory building.

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 enlarged feet of the original foundation. Due to the influence of the self-weight of the structure and the impact of the jack press frame, the depth of the underpinning piles is shallow and the bearing capacity is low, and the foundation is drilled on the enlarged feet. The hole will damage the foundation itself, and the construction efficiency is very low

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