A conveniently replaceable shield tail brush and a method for replacing the shield tail brush in a long-distance non-reinforced working condition

Abstract

The invention provides a conveniently replaceable shield tail brush and a replacement method under long-distance non-reinforcement conditions. The shield tail brush is an annular shield tail brush spliced ​​by a plurality of shield tail brush assemblies, and each shield tail brush assembly includes at least three arc-shaped shield tail brush installation rings arranged in parallel and at least three shield tail brush assemblies. The brush mount ring piece is attached to the slide bar. When the present invention is installed, the new shield tail brush is installed on the outer ring surface of the steel structure segment through the spring bolt adjustment structure, connected with the steel structure segment to assemble together, and then in the process of excavation, first pass through the demolition port on the steel structure segment Remove the original shield tail brush, and move the new shield tail brush to the installation position of the shield tail brush during the excavation process, and install it in place through the installation port on the steel structure segment. The invention realizes the replacement of the shield tail brush during the excavation process of the shield tunnel, and does not need to carry out stratum reinforcement measures during the replacement process of the shield tail brush, reduces the construction difficulty, shortens the construction period, and saves the economic cost.

Description

technical field [0001] The invention belongs to the field of shield tunneling, in particular to a conveniently replaceable shield tail brush and a method for replacing the shield tail brush under long-distance non-reinforcement working conditions. Background technique [0002] With the large-scale development of domestic subway construction, the shield construction method has been widely used in the construction of underground excavation rooms in subway areas due to its safety, speed, and wide adaptability. The shield tail brush of the shield machine is located at the tail of the shield main body. It is generally formed by bending the steel wire and fluffing it. It can be in close contact with the segment and mainly prevents water, mud, etc. from flowing into the shield along the back of the segment. The sealing function is a key sealing facility to prevent sand and mud gushing at the tail of the shield. The 3 sealing brushes of the shield tail brush form 2 sealing chambers...

AI Technical Summary

Problems solved by technology

Existing reinforcement measures mainly include freezing the strata around the shield tail or using waterproof materials to grout the stratum at the shield tail to prevent seepage. When the ground conditions are complex, the project is more difficult, and there are even many special grounds that do not have the conditions for reinforcement

Moreover, since the shield tail brush on the existing shield machine is directly welded to the inner side of the shield shell tail, when replacing the shield machine, it is necessary to plan off all the old shield tail brushes, and then weld a new shield tail brush

Due to the relatively small space in the tunnel, it is very inconvenient to plan and replace the brushes, and there are safety hazards in welding in the tunnel. During the replacement process, the removal of the old shield tail brush and the installation of the new shield tail brush are complicated, time-consuming, laborious, and inefficient.

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