Grouting process for preventing secondary settlement of open caisson

Abstract

The invention relates to a grouting process for preventing secondary settlement of an open caisson. The process includes the specific steps that firstly, in the open caisson wall manufacturing process, a steel grouting pipe is reserved in the open caisson wall and extends to a blade tip position from top to bottom; secondly, the open caisson is settled to the designed elevation according to the normal construction process for formwork erection to pour bottom board concrete; thirdly, after the strength of the bottom board concrete reaches 70% of the designed strength, primary grouting is performed through the steel grouting pipe reserved in the open caisson wall, wherein grout should be evenly and symmetrically added to prevent the open caisson from inclining; fourthly, after primary grouting is performed, secondary grouting is performed before the grout is preliminarily solidified; and fifthly, a blade tip is tightly connected with surrounding soil through mortar so that secondary settlement of the open caisson under the effect of an upper structure or an upper building can be reduced. By the adoption of the grouting process for preventing secondary settlement of the open caisson, secondary settlement of the open caisson can be reduced and the risks of differential settlement generated due to the upper structure or the upper building are reduced.

Description

technical field [0001] The invention relates to a construction caisson construction technique, in particular to a caisson construction technique suitable for a building (structure) on the upper part. Background technique [0002] The caisson has many advantages such as high rigidity, high bearing capacity and strong impermeability, making it one of the most important construction methods for large urban underground structures and deep foundations. Of course, there are still some intractable technical problems in caisson construction. For example, the sinking of the caisson will cause great disturbance to the surrounding soil. After the caisson sinks to the design elevation, it will cause secondary subsidence under the additional load of the upper building (structure), and the secondary subsidence will cause the upper Buildings (structures) generate additional stress. When uneven settlement occurs, accidents such as wall or floor cracking are likely to occur, and even the en...

AI Technical Summary

Problems solved by technology

At present, there is no reliable grouting process to prevent secondary subsidence in the field of caisson construction

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