Dedicated device and construction method for performing foundation underpinning under strip foundations

Abstract

The invention discloses a dedicated device and construction method for performing foundation underpinning under strip foundations and relates to the technical field of basement construction methods. The method comprises the following steps of: cleaning barriers and breaking floors of a first floor of an original building to the bottom surface of the strip foundations; reinforcing the strip foundations, expanding the width and thickness of the bottom of nodes of the strip foundations, utilizing the nodes as a bearing platform, then expanding the section of the top of the strip foundations and the reinforcement ratio of the strip foundation, improving flexural bearing capacity of the strip foundations and using the strip foundations as a continuous beam; adding static pressure piles and pressing the static pressure piles to the calculated depth through an anchor rod static pressure pile construction technology; installing a basement. According to the dedicated device and construction method for performing foundation underpinning under the strip foundations, the firm degree of the basement is improved through dual reinforcement of increasing a reinforced brick structure in the strip foundations and applying jet grouting piles to the basement; meanwhile, construction time is saved, and the construction efficiency is improved; and thus, construction cost is saved.

Description

technical field [0001] The invention relates to the technical field of basement construction methods, in particular to a structure for underpinning a foundation under a strip foundation and an underpinning construction method. Background technique [0002] With the increase of urban motor vehicles, adding basements to existing buildings has become one of the methods to solve the problem of urban parking difficulties. In the project of adding basements to existing buildings, how to reasonably transfer the load of the upper structure and how to reduce the impact of construction The impact of existing buildings and the surrounding environment is the key issue. Adding basements to existing buildings is a comprehensive system that integrates foundation pit engineering, underpinning engineering, pile foundation engineering, and structural engineering. They are rare, engineering experience is obviously insufficient, and scientific research on the addition of basements is rare. The...

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a special device and construction method for underpinning the foundation under the strip foundation, which solves the problem that the existing construction method for adding a basement has a low degree of reinforcement, and at the same time it needs to be excavated The construction of the basement can only be carried out, and the problem of low construction efficiency

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