Three-hole grouting method for crescent-shaped shield body gap

Abstract

The invention discloses a three-hole grouting method for a crescent-shaped shield gap. The three-hole grouting method comprises the following steps that the shield gap is divided into a micro-settlement control initial stage and a shield passing stage; according to the characteristics of the two-stage shield gap, the arrangement position of shield gap grouting in the longitudinal direction of a shield and the arrangement form of shield gap grouting on the cross section of the shield are designed, namely, a crescent-shaped shield gap three-hole grouting method is adopted; according to shield equipment parameters and prefabricated segment structure design parameters, the grouting amount of the two-stage shield gap is calculated, the two-stage shield gap grouting construction technology is designed according to the grouting amount, and two-stage shield gap grouting is conducted; and the shield tail gap grouting amount is calculated, and shield tail gap synchronous grouting is conducted. According to the three-hole grouting method, the total grouting amount of gap filling is effectively reduced, the filling effect of the grouting process is better, micro-deformation control can be effectively conducted, the traditional secondary grouting frequency can be reduced, and the shield construction period can be shortened.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to the grouting process design in shield tunneling, in particular to a three-hole grouting method for crescent-shaped shield gaps. Background technique [0002] Due to its advantages of high degree of mechanization, fast excavation speed, and little impact on the surrounding environment, the shield tunneling method has gradually developed into the preferred construction method for urban underground tunnel construction. More than 70% of subway tunnels in the central areas of Beijing, Tianjin, Shanghai and other cities use the shield method. With the localization of shield equipment and the increase in labor costs, the shield method will become the mainstream construction method for urban subways, pipe corridors, mountain tunnels and other projects in the future. [0003] When the shield is excavated, the shield body is in close contact with the formation. Even if the most a...

AI Technical Summary

Problems solved by technology

Therefore, it is very important to fill the gap between the shield and the shield when it passes through. However, the control method for the non-uniform convergent formation displacement in the excavation gap of the shield is not yet mature. Micro-deformation control requirements, in view of this, the present invention researches shield body gap grouting arrangement method and grouting process, in order to meet the micro-deformation control requirements of shield tunneling engineering for formation and structure

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