Trepanning and repairing construction method for existing raft foundation

Abstract

The invention relates to a reinforcing construction method for a raft foundation, in particular to a trepanning and repairing construction method for the existing raft foundation. The trepanning and repairing construction method for the existing raft foundation comprises the steps that A1, the existing raft foundation is surveyed, and the trepanning position and the aperture are determined; A2, concrete of the raft foundation is removed by adopting mechanical drilling within the range of 4 / 5 of the designed aperture until a plain concrete cushion of the raft foundation is completely exposed; A3, concrete of the raft foundation is manually removed within the range of 1 / 5 of the residual designed aperture, a reinforcing mesh of the existing raft foundation is exposed, the plain concrete cushion of the existing raft foundation is cleared and leveled, and the foundation reinforcement is completed; A4, the reinforcing design of the reinforcing mesh reinforcement connection in a hole is completed; A5, concrete which is higher than the strength grade of the concrete of the existing raft foundation and doped with an expanding agent is poured into the hole, vibrated and compacted; and A6, top laitance is removed to the top elevation of the existing raft foundation. According to the trepanning and repairing construction method for the existing raft foundation, the problem that the existing raft foundation is seriously damaged by existing manual chiseling, the overall effect is poor after the raft foundation is reinforced, and the cooperative work of the foundation reinforcement is not facilitated is solved.

Description

technical field [0001] The invention relates to a raft foundation construction method, in particular to an existing raft foundation opening and repair construction method. Background technique [0002] At present, due to reasons such as improper use of survey, design, and construction methods, or changes in the use requirements of buildings, such as adding floors, increasing loads, and expansion, etc., the foundation and foundation cannot meet the use requirements, and the original buildings need to be reinforced. . The usual method is to manually remove the existing raft foundation to create construction conditions for subsequent foundation reinforcement. The method of cutting the raft foundation has the following problems: 1. Direct manual removal has adverse effects on the existing structure, such as vibration and damage , cracks, etc.; 2. It cannot provide effective working conditions for subsequent processes, such as steel bar connection, new and old concrete bonding, ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for opening and repairing the existing raft foundation to solve the problem that the existing raft foundation cannot be provided with effective working conditions for the subsequent process by manually chiseling the existing raft foundation, and the reinforcement effect of the raft foundation is poor

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