Construction method for tunnelling small-radius curve segment of tunnel through shield method

Abstract

The invention relates to a construction method for tunnelling a small-radius curve segment of a tunnel through a shield method, comprising the following steps of: (1) designing a shield machine and a duct piece; (2) ensuring the shield machine to be pushed along a design axis by controlling the value of the elevation of a notch plane of the shield machine in the construction pushing process of the shield machine, and particularly correcting deviation before the shield machine is pushed into the extra-small-radius curve segment; and (3) splicing the corresponding duct pieces into the tunnel byadopting a standard curve ring and a small-ring width linear ring of appropriate wedge quantity, which are selected according to a calculated deviation connecting quantity value in the step (1), on the extra-small-radius curve segment on the basis of the shield machine tunnelling along the design axis of the tunnel. The construction method can realize that a shield can well control the design axis of the tunnel in the whole tunnelling process of the small-radius curve segment and ensure that the duct pieces and the shield are not jammed, and a curve at the small-radius curve segment is easement.

Description

technical field [0001] The invention relates to a construction method in the technical field of large-diameter shield-tunneling method tunnel construction for super-small-radius curved segment excavation by shield tunneling. Background technique [0002] With the rapid development of urban rail transit construction, there are more and more subway and underground highway tunnel projects in the city, and most of them are constructed by shield method, which makes the available underground space less and less. Due to the needs of rail transit network, subway lines need to criss-cross to form a rail transit network extending in all directions. Therefore, in the process of rail transit construction, more and more cases of shield tunneling through buildings are encountered. Many buildings are due to protection requirements. High, or its pile foundation is deep and cannot be damaged. Therefore, when designing and planning many underground projects, it is necessary to consider the pr...

AI Technical Summary

Problems solved by technology

In order to avoid important buildings or pile foundations that exceed the tunnel section, the design axis has to be changed according to the intricate underground environment. When designing many tunnels, it will be found that the lines are no longer straight lines, but irregular. The curve and the radius of curvature also become smaller and smaller with the reduction of the available underground space, which brings great difficulties to the construction of the shield method

[0003] However, during the construction process of shield tunneling in the ultra-small radius and small curvature section, jamming between the segment and the shield is easy to occur. When the segment fits the design axis at the small radius curvature section, the curve is not gentle enough. The actual excavation axis and the shield There is a large deviation in the design axis, and it is difficult to control the excavation tunnel axis during the excavation process of the shield machine in the entire small curvature section