Annular tool and method for deformation straightening of highly permeable sand layer large-diameter shield tail shield

Abstract

The invention discloses an annular tool and method for deformation straightening of a highly permeable sand layer large-diameter shield tail shield. The annular tool comprises a counterforce support frame, a base plate and a meniscus structure. The counterforce support frame is of an annular structure. The outer cambered surface of the counterforce support frame is provided with first buttresses at intervals in the longitudinal and circumferential directions. A pre-tightening jack is arranged between the first buttresses located in the longitudinal direction of the counterforce support frame.A plurality of straightening jacks are arranged in a tail shield deformation area corresponding to the outer cambered surface of the counterforce support frame. A gap between the first buttresses andthe tail shield is filled with the base plate. The meniscus structure is installed on the inner cambered surface, corresponding to the tail shield deformation area, of the counterforce support frame.Through the annular tool and method, the problems of tail shield deformation and tail shield rounding straightening of a shield tunneling machine are solved.

Description

technical field [0001] The invention relates to the field of shield tunnel construction. More specifically, the present invention relates to a ring-shaped frock and a method for correcting the deformation of the tail shield of a large-diameter shield in a strong water-permeable sand layer. Background technique [0002] Shield construction has become an important part of tunnel construction, and more and more shield machines have been put into tunnel construction. With the increase of shield tunneling projects, there are more and more problems with tunnel tunneling machines in different strata. When the shield machine excavates in the water-rich and dense sand layer, the stratum is dense, and a large foundation reaction force and passive earth pressure will be generated during the deflection correction process of the shield machine. When the partial passive earth pressure on the tail shield is greater than the strength of its own steel plate, the tail shield will produce pl...

AI Technical Summary

Problems solved by technology

When the passive earth pressure on the part of the tail shield is greater than the strength of its own steel plate, the tail shield will produce plastic deformation, resulting in the contact and extrusion of the tail shield steel plate, the propulsion cylinder shoe and the segment, and the shield machine will be trapped and cannot continue to excavate

When encountering this kind of shield tunneling problem, it is necessary to use the correction device to correct the deformation of the tail shield, so that the shield machine can get out of trouble and continue to tunnel

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