Shield tunneling machine integrated freezing method for reinforcing formation

Abstract

The invention discloses a shield tunneling machine integrated freezing method for reinforcing a formation. The method comprises the following steps of 1, preparing low-temperature freeze water; 2, arranging cutter head freezing areas; 3, installing freeze pipes; 4, arranging monitoring points and installing sensors in a frozen reinforcement formation; 5, laying fire-proof heat-insulated layers; 6,setting a mud and water cabin partition plate as a cold plate; 7, forming the frozen reinforcement formation into a frozen body. The method is simple in step and high in operability, high sea water pressure can be overcome, it is achieved that a soil body around a cutter head is effectively and reliably frozen and reinforced, less cold in the vertical freeze pipes is dissipated outwards, less external heat invades, and the freezing efficiency is improved; besides, the situations that due to in-cabin flame operation, the frozen body is melted and the strength is reduced are avoided, therefore,it is ensured that the cutter head frozen body of the shield tunneling machine is stable and safe, and the effect of control over the temperature of the frozen body is significant.

Description

technical field [0001] The invention belongs to the technical field of combined freezing of shield machines, and in particular relates to a method for strengthening strata by combined freezing of shield machines. Background technique [0002] During the construction process of the shield machine, damage to the cutterhead and cutter box may occur and hot work repairs are required. The hot work repair under pressure is risky and costly, and the repair quality is difficult to control. It is advisable to use normal pressure hot work repairs . Generally, after the formation is strengthened, the normal pressure hot fire operation is used to repair, or the shaft is constructed in front of the cutterhead and then repaired. With the vertical shaft method, the cofferdam needs to be constructed first, then excavated and supported, and finally repaired. The construction period is long, and large equipment such as excavators and dredgers are required, and the site requirements are high...

AI Technical Summary

Problems solved by technology

[0003] In the water environment, in order to meet the requirements of environmental protection, grouting reinforcement and freezing reinforcement are generally used to strengthen the formation. The formation reinforcement must resist water and soil pressure and block water seepage lines in all directions. However, the grouting reinforcement method cannot effectively ensure that the reinforcement slurry penetrates into the formation. Everywhere, it is difficult to ensure that the reinforced body forms a complete safety protection barrier against water and soil pressure, and it is also impossible to accurately and comprehensively detect the quality of the reinforced body

[0004] Furthermore, after the formation is strengthened by the freezing method, hot work in the frozen reinforcement body of the shield machine cutter head will cause the temperature and strength of the frozen body to fail to meet the design requirements

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