Horseshoe semi-section shield tunneling machine suitable for fault fracture zone and construction method of horseshoe semi-section shield tunneling machine

Abstract

The invention provides a horseshoe semi-section shield tunneling machine suitable for a fault fracture zone and a construction method of the horseshoe semi-section shield tunneling machine. The horseshoe semi-section shield tunneling machine comprises a main shield tunneling machine, a shield structure is arranged on the main shield tunneling machine and comprises a front shield, a front extendingbeam and a baffle are annularly arranged at an upper area of the front shield, the front shield is connected with a tail shield, the tail shield is connected with a beam shaped like a Chinese character 'mi', a main pushing system is annularly arranged in the tail shield, and an assembling device is arranged on the beam shaped like the Chinese character 'mi'; and a crushing arm is arranged on theupper part of the front shield, a driving device is arranged on the lower part of the front shield and connected with a cutterhead device, and a conveyor is arranged at the bottom of the front shieldand transversely penetrates through the tail shield and a central area of the assembling device. An open-type excavation mode of the upper part of the front shield and a shield pushing mode of the lower part of the front shield are combined, internal stress of a rock mass of the fault fracture zone is released, the characteristic of the self-bearing capacity of surrounding rock is also utilized, horseshoe full-section excavation of the rock mass of the fault fracture zone, mucking and lining mechanical construction are achieved, the risk caused by large deformation is reduced, and high efficiency and environmental protection are achieved.

Description

technical field [0001] The invention relates to the technical field of special-shaped tunnel construction equipment, in particular to a horseshoe-shaped half-section shield machine suitable for fault fracture zones and a construction method. Background technique [0002] In the construction of mountain tunnels, frequently used construction methods and support systems, such as drill and blast method, step method, three step method, double side wall pilot pit method, CD method, CRD method, etc., are mostly based on the new Austrian method. The foundation, that is, based on the maintenance and utilization of the self-bearing capacity of the surrounding rock, using anchor rods and shotcrete as the main support means, timely support, control the deformation and relaxation of the surrounding rock, and make the surrounding rock the foundation of the support system. component. The fault fracture zone has the characteristics of poor stability, low strength, poor water permeability, ...

AI Technical Summary

Problems solved by technology

The fault fracture zone has the characteristics of poor stability, low strength, poor water permeability, easy deformation and poor compressibility, etc.

Due to the complex and changeable geological conditions of the surrounding rock, during the excavation of the tunnel, the fault fracture zone is encountered, the structure of the surrounding rock is extremely unstable or the self-bearing capacity is weak, the excavation destroys the original stress balance of the rock mass, and collapses often occur , roof fall and other accidents have a great impact on tunnel safety

In addition, it is difficult to control deformation and the construction process is complicated. The complex construction method leads to long process time, long-term exposure of surrounding rock, easy to cause large-scale encroachment of surrounding rock, spalling and falling of shotcrete, twisting and deformation of steel frame, etc., further increasing the collapse. Risks, safety and quality are not easy to guarantee, and the construction period is restricted

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