The method of replacing the first shield tail brush of the shield machine at one time

Abstract

The invention relates to a method for replacing a primary tail brush of a shield tunneling machine by one time. The method comprises the following steps: a spliced bottom sealing block serves as the datum firstly, two screw hole positions are moved towards detecting ring segments on the two sides of the bottom sealing block correspondingly to form two gaps, and the segments on the left side and the right side of the bottom sealing block are interactively spliced till an overhauling ring is spliced into a ring shape; and after the overhauling ring is spliced, the overhauling ring is propelled by a section of overhauling distance, the primary tail brush is made to reach a replacement position behind the overhauling ring, the tail brush is replaced according to the sequence of interactive splicing of the left side and the right side of the bottom sealing block, only one segment is dismantled and one tail brush is replaced each time, and circulating is conducted on the basis till a top sealing block is spliced finally. According to the method, the difficulty that the overhauling ring segments are difficult to dismantle is overcome; all the tail brushes can be replaced only through one-time halt, and compared with a previous method of multiple-time halt zoning replacing, the method has the multiple advantages of high construction efficiency, low security risk and the like.

Description

technical field [0001] The invention relates to a civil engineering construction method, in particular to a method for replacing the first shield tail brush of a shield machine at one time. Background technique [0002] The shield method of tunnel construction has many advantages such as safety, high efficiency, and low environmental impact, and has been widely used in the construction of subway tunnels, highway tunnels, and municipal pipeline projects. The shield tunneling method supports the soil around the shield machine through the shield shell, and adopts sealing measures to prevent the external soil, water or grouting slurry from invading the inside of the shield. The shield sealing measures are mainly used in the three key parts of the shield main bearing, the shield body hinge and the shield tail, among which the shield tail seal is an important barrier to ensure the isolation between the inside of the shield machine and the groundwater. [0003] At present, the shi...

AI Technical Summary

Problems solved by technology

It is very difficult to find 5 consecutive ideal parking positions

[0010] 2) Excessive number of shutdown inspections will slow down the construction progress, have high requirements for construction organization and low efficiency

[0011] 3) Frequent shutdowns increase the risk of the cutter head of the shield machine being stuck, and the construction safety risk also increases accordingly

In addition, there is currently a freezing method to replace the shield tail brush. The freezing method is used to replace the shield tail brush, so that a circle of freezing curtain is formed at the tail of the shield to block the water and soil outside the gap in the shield tail. However, The construction method of replacing the shield tail brush with the freezing method requires prefabricating special segments embedded with freezing pipes, the construction cost is high, and the formation of the frozen soil curtain takes a long time

In addition, due to the existence of the longitudinal seam joints of the shield segment, the frozen pipe is not continuous in the circumferential direction of the segment, and there is a weak point of the permafrost curtain, and there is a large leakage hidden danger

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