A method of shield machine combined freezing and strengthening stratum

Abstract

The invention discloses a shield machine combined freezing and strengthening stratum method, which comprises the following steps: 1. Preparation of low-temperature frozen water; 2. Setting the freezing area of ​​the cutter head of the shield machine; Arrange monitoring points and install sensors in the stratum; 5. Lay fire-proof insulation layer; 6. Set the partition of the mud tank as a cold plate; 7. Freeze and strengthen the stratum to form a frozen body. The method of the invention has simple steps and strong operability, can overcome the high water pressure in the sea area, realize effective and reliable freezing and reinforcement of the soil around the cutter head, reduce the internal cooling of the vertical freezing pipe and the intrusion of external heat, and improve the freezing efficiency. In addition, it avoids the melting of the frozen body and the reduction of strength due to the hot work in the warehouse, so as to ensure the stability and safety of the frozen body on the cutter head of the shield machine, and the control effect on the temperature of the frozen body is remarkable.

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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