Shield tunneling machine with function of quickly freezing tunnel face and construction method

Abstract

The invention provides a shield tunneling machine with a function of quickly freezing a tunnel face and a construction method. The shield tunneling machine comprises a shield tunneling machine cutterhead cutter, a main driving device, a spiral conveyor, a front shield, a middle shield, a tail shield and a segment erector, and further comprises a liquid nitrogen tank and a portable propelling device, wherein the liquid nitrogen tank is connected with a freezer arranged at the front part of the shield tunneling machine through a diverter valve and a liquid supply hose. By means of the method, quick pre-drilling of freezing holes in the shield tunneling machine is achieved for positioning, freezing pipelines are arranged, the tunnel face in front of the shield tunneling machine is reinforced,and maintenance in the shield tunneling machine, safe bin opening for cutter replacement and reinforcement during tunnel portal entering and exiting are achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel boring machines, in particular to a shield machine with the function of rapidly freezing the tunnel face and a construction method. Background technique [0002] The artificial ground freezing method is a special construction technology that uses artificial refrigeration technology to freeze the water in the ground to increase its strength and stability, so that underground engineering excavation and masonry construction can be carried out under the protection of the frozen wall. It is a temporary reinforcement technology. When the reinforcement strength is not needed, it can be melted by forced thawing technology. The freezing method construction has a history of more than 100 years, and it has been widely used in my country for more than 40 years. Since 1992, the freezing method technology has been used in subway construction in Shanghai, Beijing and other places. [0003] In the prior art, alth...

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Problems solved by technology

[0003] In the prior art, although there is a construction process of using liquid nitrogen freezing method to reinforce the tunnel when the shield enters and exits the tunnel, the layout of the frozen pipelines is always on the ground or on the ground surface, and it takes a long time to occupy the ground space; Due to traffic flow restrictions, the ground is not ready for freezing construction

[0004] In existing patents such as "Frozen Cutter Arrangement Structure CN201821967228", it is proposed to use a shield cutter with a freezing function to freeze the tunnel face, so as to realize the purpose of replacing the cutter and overhauling the cutter in the shield machine, but this technology needs to be designed and manufactured in advance Frozen cutter head, and the design of the cutter head with freezing function, high manufacturing cost and long cycle; at the same time, the brine freezing technology is used, the freezing cycle is long and the efficiency is low

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