A construction method for sealed receiving of shield steel sleeve

Abstract

The invention discloses an airtight receiving construction method for a shield steel sleeve. The airtight receiving construction method for the shield steel sleeve includes the following steps that when the shield tail completely enters a reinforcing body, grouting and plugging are conducted on segments disengaging from the shield tail; bentonite slurry is injected to the outer side of a shield body through a radial grouting hole of the shield body; secondary grouting is conducted on the first and second segments disengaging from the shield tail, and thus an external water system is blocked and isolated; dewatering measures are taken inside the reinforcing body, so that the water line in the reinforcing body is lower than the excavation bottom face; the steel sleeve is installed on a pre-buried ring-shaped steel jacket of a tunnel portal, and an end socket and a reaction frame are installed; the steel sleeve is filled with mortar; an underpressure excavation mode is adopted, so that the pressure of muddy water in an excavation bin to the wall of the steel sleeve is reduced; an observation hole is formed in the bottom of the end socket, and the effects of grouting, plugging and dewatering are re-checked; and the end socket and the reaction frame are dismounted, a shield tunneling machine continues to be pushed forward until the shield tunneling machine completely enters a tunnel, grouting and plugging are conducted on the last ring of segments, the tunnel portal is closed, the shield tunneling machine, the steel sleeve, the end socket and the reaction frame are lifted out, and receiving is completed.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a shield steel sleeve airtight receiving construction method. Background technique [0002] With the rapid development of our country's economy and the continuous acceleration of urbanization, the urban population is increasing, the available space on the ground is getting less and less, and the urban traffic is becoming more and more congested. The development and utilization of urban underground space has become the focus of urban development today. Inevitably required. Due to its small impact on ground traffic, high construction safety, and low noise, the shield method has become the preferred construction method for constructing subway interval tunnels and cross-street tunnels. [0003] When the shield tunneling method is used for construction, there is a relatively large risk in the reception of the shield tunnel, and it is usually necessary to reinforce the soil at the r...

AI Technical Summary

Problems solved by technology

End reinforcement methods include deep mixing piles, high-pressure jet grouting piles, plain concrete underground diaphragm walls, freezing reinforcement, SMW construction methods, grouting reinforcement, composite treatment methods, etc. In actual projects, the above construction methods are often used in combination. In engineering, it is often difficult to ensure that the reinforcement length of the end meets the requirements of the safe reception of the shield due to the limited space of the site, the difficulty of pipeline demolition, and the harsh geological conditions.

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