Subway tunnel shield end reinforcing method

Abstract

The invention discloses a subway tunnel shield end reinforcing method. The subway tunnel shield end reinforcing method comprises the following steps of reinforcing the shield end head, reinforcing thewater supply pipe and reinforcing the bridge pier, and the shield end reinforcing method is reinforced by using a high-pressure rotary spraying pile with Phi 800@600, the water supply pipe reinforcement and the bridge pier reinforcement are reinforced through a sleeve valve pipe. The reinforcing method has the advantages that the reinforced soil body has good uniformity, self-supporting propertyand water stopping property, the non-lateral limit compressive strength of the reinforced soil body is not less than 1 Mpa, and the permeability coefficient is less than 1.0*10 <-5> cm / s, no large bump or settlement exists on the ground after the soil body is reinforced, the construction period is short, and the safety of subsequent construction is ensured.

Description

technical field [0001] The invention relates to a method for reinforcing the end of a subway tunnel shield. Background technique [0002] The superiority of underground railway transportation in solving urban traffic problems is very obvious. In recent years, subway construction has been widely spread across the country. In subway construction projects, shield tunneling is widely used as an intelligent construction machine for tunnel construction. During the construction process of the shield tunneling project, accidents such as excessive surface deformation and collapse are prone to occur at the start and reception of the shield tunnel, especially when the reinforcement at the end fails to meet the design requirements or the reinforcement fails, safety accidents are extremely prone to occur. [0003] When the shield machine enters and exits the hole, the working surface will be in an open state, and this open state will last for a long time. If it is not handled properly, ...

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Problems solved by technology

[0004] There is a water pipe with a diameter of 1.4m at the end of Dazhi Road in the section from Jianghan Road Station to Dazhi Road Station 1.7m below the surface, which crosses the reinforcement area at the end of the shield machine. This area is difficult to reinforce. There are great difficulties in the discovery; there is a light rail pier foundation of Line 1 at a distance of 15m from the end of the shield machine. The pier foundation pile foundation is 3.4m closest to the right line of the shield machine, and 1m to the left line. The pier foundation pile is 52m long and embedded in weathered In the rock, the construction is more difficult

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