Underground diaphragm wall groove bottom post-grouting construction method

By using a grouting pipe joint with a specific thread structure and sealing technology at the bottom of the diaphragm wall trench, combined with water splitting and plug opening treatment and multi-index termination conditions, the problems of inconsistent grouting pipe layout and ambiguous parameters were solved, achieving precise control of the grouting process and stable reinforcement of the structure.

CN122082433APending Publication Date: 2026-05-26CHINA CONSTR THIRD ENG BUREAU GRP CO LTD
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Patent Information

Application Number
CN202610065903.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-19
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing diaphragm wall trench bottom reinforcement technology, the layout of grouting pipes lacks a unified standard, has poor adaptability, insufficient connection sealing, vague grouting parameters, and lacks a standardized control system, resulting in insufficient load-bearing capacity of the trench bottom and affecting the stability and safety of the engineering structure.

Method used

The grouting pipe joint adopts a specific thread structure and sealing process to ensure that it is tied and fixed to the main reinforcement of the steel cage. The correspondence between the number of grouting pipes and the length of the trench is established. The grouting channel is pretreated by water splitting and plug opening treatment. Multiple termination conditions are set, and grouting data is recorded in detail to achieve precise control.

Benefits of technology

It improves the adaptability and sealing of the grouting pipe, ensures the availability of the grouting channel, dynamically balances the grouting volume and structural deformation, avoids excessive wall bulging caused by excessive grouting pressure, and achieves stability and safety of the reinforcement effect.

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Abstract

The invention relates to the technical field of grouting construction methods, in particular to an underground diaphragm wall groove bottom post-grouting construction method which comprises the following steps that S1, a groove is excavated in a natural terrace; s2, a reinforcement cage is hoisted into the groove; and S3, a grouting pipe is machined and manufactured, the length of the grouting pipe is made to be larger than the height of the reinforcement cage, the grouting pipe is formed by splicing a plurality of grouting pipe units through connectors, the grouting pipe units make sealing contact with the connectors, and it is ensured that all the connectors are screwed tightly and the hoisting process is stable when the grouting pipe is placed. By establishing the clear corresponding relation between the number of the grouting pipes and the length of the groove section, it is ensured that the wall toe areas of the walls of different sizes can be subjected to evenly-covered grouting reinforcement. Meanwhile, the grouting pipe joint with a specific thread structure and a sealing process is adopted, and the binding and fixing mode of the grouting pipe joint and the main reinforcement of the reinforcement cage is stipulated, so that the integrity and the sealing performance of the grouting pipe in a complex construction environment are enhanced, the pipeline is effectively prevented from falling off, being broken and leaking slurry, and the final usability of a grouting channel is ensured.
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