Reinforcing method for shield receiving tunnel portal

Abstract

The invention relates to a reinforcing method for a shield receiving tunnel portal. The reinforcing method comprises the steps that reinforcing piles are constructed in a soil body of a receiving tunnel at the receiving tunnel portal through a horizontal MJS construction method, and the reinforcing piles formed through construction are arranged around the periphery of a to-be-constructed segment so as to form a soil body reinforcing area; and after the to-be-reinforced piles reach certain strength, freezing construction is conducted on the soil body reinforcement area through a freezing method, so that a freezing waterproof curtain is formed on the periphery of the to-be-constructed segment, and reinforcement of the receiving tunnel portal is completed. According to the reinforcing method, the annular soil body reinforcing area is adopted, compared with full-section construction, the number of reinforcing piles is reduced, the cost can be reduced, and the construction period can be shortened. The freezing method is adopted for freezing to form the freezing waterproof curtain, frozen cement soil has high collapse resistance, the bearing capacity of the frozen cement soil is further improved, meanwhile, after cement is mixed into the soil body, the problems of frost heaving and thaw collapse generated in the horizontal freezing process can be effectively solved, and safe operation of surrounding buildings and structures is ensured.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a reinforcement method for a shield tunnel receiving portal. Background technique [0002] Shield reception is a key process in sub-projects of shield tunnel construction, and the quality of end reinforcement is related to whether shield reception can be carried out safely. The commonly used reinforcement method is to make rotary grouting piles or mixing piles vertically from the ground. However, when the reinforcement depth is large or the reinforcement conditions from the ground are not available, these methods cannot be implemented or the quality is difficult to guarantee. The horizontal MJS construction method can effectively solve this problem. question. [0003] However, at present, the MJS horizontal reinforcement method commonly used in domestic shield construction is mainly full-section reinforcement. The main problems are high cost, and the cost of constructio...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, provide a reinforcement method for the receiving portal of the s

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