Steel pipe piece device for freezing soil around tail of shield tunneling machine and construction method of steel pipe piece device

Abstract

The invention discloses a steel pipe piece device for freezing soil around the tail of a shield tunneling machine. The steel pipe piece device comprises a plurality of arc-shaped steel pipe pieces, freezing pipelines and rib plates, wherein the arc-shaped steel pipe pieces are sequentially connected to form annular steel pipe pieces; a plurality of rows of freezing pipelines are arranged on the inner surface of each arc-shaped steel pipe piece along an arc line, the freezing pipelines on the same row of the adjacent arc-shaped steel pipe pieces are connected through first pipes to form a plurality of annular freezing pipelines, and secondary refrigerants in the annular freezing pipelines enable the temperature of the annular steel pipe pieces to be reduced, so that the soil around the annular steel pipe pieces is frozen; and the rib plates are arranged on the inner surfaces of the arc-shaped steel pipe pieces, rib plate cavities are formed, the rib plate cavities are filled with greasewith low freezing point, and an annular thin plate is arranged at the end of each rib plate and used for blocking the corresponding rib plate cavity so as to prevent the grease from falling off. Thedevice can efficiently freeze the soil around the tail of the shield tunneling machine, so that a circle of uniform freezing curtain is formed at the tail of the shield tunneling machine, and water and soil outside a shield tail gap are blocked. The invention further discloses a construction method for replacing a tail brush of the shield tunneling machine.

Description

technical field [0001] The invention relates to the replacement of a shield tunnel construction tail brush. More specifically, the present invention relates to a steel pipe sheet device for freezing soil around the tail of a shield machine and a construction method thereof. Background technique [0002] With the acceleration of urbanization, subway tunnel sections are getting longer and longer, and shield tunneling under complex geology is becoming more frequent. The excavation construction of long-distance and complex strata with shield tunneling has also become an inevitable trend. During the long-distance excavation of the shield machine, the shield tail sealing wire brush (hereinafter referred to as "shield tail brush"), which is one of the main sealing parts of the shield machine, is very easy to damage and difficult to repair. There is a certain gap between the outer wall of the shield segment and the inner side of the shield tail. The biggest difficulty in replaceme...

AI Technical Summary

Problems solved by technology

In the freezing scheme of replacing the tail brush, the conventional freezing method is difficult to realize, and it is necessary to design a special form and structure of the freezing tube within the low temperature adaptability range of the shield steel and segmental concrete

The conventional practice of drilling holes in the concrete segments at corresponding positions in the tunnel for freezing has penetrating damage to the segments, which can lead to defects such as permanent leakage hazards and poor circumferential uniformity of the frozen soil curtain

In addition, a small number of projects in China have used built-in freezing pipes in concrete segments. Due to the tightness of the freezing pipes, once leakage occurs, it cannot be compensated.

Images