Construction method of synchronous grouting process for ground in-out shield-driven tunnel

Abstract

The invention provides a construction method of a synchronous grouting process for a ground in-out shield-driven tunnel. The construction method comprises the following steps: 1, producing grout; 2, confirming synchronous grouting construction parameters according to working conditions, wherein the synchronous grouting construction parameters are injecting rate, proportional distribution of the upper part and the lower part, and grouting pressure control; 3, carrying out construction according to the synchronous grouting construction parameters. The construction method has the benefits that 1, in the aspect of performance index, a grout material can perform better flowing and filling performances than a conventional grout material; 2, in the aspect of performance index, the grout material has higher early strength than the conventional grout material; 3, the construction parameters are obtained according to different working conditions of a ground in-out shield-driven tunnel, so that construction quality can be controlled effectively.

Description

technical field [0001] The invention relates to a synchronous grouting process for tunnels, in particular to a construction method for the synchronous grouting process for tunnels with a ground access type shield tunneling method. Background technique [0002] The shield construction method has become the first choice for urban tunnel construction methods due to its advantages such as small impact on the surrounding environment, high forming quality, safety and reliability, fast construction progress, and low cost. The synchronous grouting technology in shield tunneling construction is an indispensable key auxiliary construction method in shield tunneling construction method, and it is the key to control ground settlement and tunnel stability. The synchronous grouting process of shield tunneling is to inject grout with certain working performance and strength into the outer gap of the segment ring at the tail of the shield through the grouting pump while the shield is excava...

AI Technical Summary

Problems solved by technology

[0013] 1) The grout flow and filling performance in conventional synchronous grouting construction is poor. Under the construction conditions of the ground access shield tunneling method (the surrounding soil confining pressure is small), the grout material does not have the flow to fully fill the building void. sex;

[0014] 2) The construction parameters (grouting volume and grouting pressure) in the conventional synchronous grouting process are all calculated by considering the surrounding confining pressure, and the setting range of parameter values ​​is relatively large, while the ground access shield tunneling If the amount of grouting or the grouting pressure is too large, the ground will be prone to grout or the grout will penetrate the ground and the surface will bulge; if the amount of grouting or the grouting pressure is too small, the building void will not be fully filled, resulting in a stable tunnel. Poor performance and subsidence of the surrounding ground

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