Shield starting tunnel portal extension steel ring

Abstract

The invention discloses a shield starting tunnel portal extension steel ring. The shield starting tunnel portal extension steel ring is characterized in that the steel ring comprises a steel ring body (1) with the width of at least 45mm, one end of the steel ring body (1) is connected with a first ring plate (2), the internal diameter of the first ring plate (2) is equal to that of the steel ring body (1), the external diameter of the first ring plate (2) is larger than the diameter of the steel ring body (1), and a second ring plate (3) is fixedly connected with the first ring plate (2), twice as thick as the first ring plate (2) and embedded in the wall of a tunnel portal. The shield starting tunnel portal extension steel ring is simple in structure and skillful in design, avoids dust pollution caused by manual pile breaking and can improve working efficiency of a shield machine.

Description

technical field [0001] The invention relates to an auxiliary structure for a starting portal of a shield machine, in particular to an extended steel ring for a starting portal of a shield machine. Background technique [0002] In the subway shield construction, the starting of the shield machine is a very important link. In the previous construction, because the distance between the door seal and the face of the tunnel is very short, in order to make the cutter head of the shield machine When the pile is broken, the cord rubber sheet will not be damaged. Before breaking the pile, it is usually necessary to manually remove the face of the pile to a depth of 60cm to ensure the space for the cutter head to rotate. However, manual pile breaking construction will generate a lot of dust, and because the mid-slab of the station passing the station is often sealed, the dust cannot be discharged smoothly, which makes the air quality in the station drop sharply, seriously affecting th...

AI Technical Summary

Problems solved by technology

However, manual pile breaking construction will generate a lot of dust, and because the mid-slab of the station passing the station is often sealed, the dust cannot be discharged smoothly, which makes the air quality in the station drop sharply, seriously affecting the construction environment of workers, and also It will affect the assembly work of the shield machine passing station, which will seriously delay the progress of the shield machine passing station construction

Images