Super-large-section subsurface tunnel tall core soil dismounting method

Abstract

The invention provides a super-large-section subsurface tunnel tall core soil dismounting method. The method includes the following steps that (1) a first pilot pit is formed through excavation on theupper portion of one side of upper core soil in the longitudinal direction of a tunnel, and the first pilot pit is in a horizontal state; (2) a second pilot pit in a horizontal state is formed through excavation on the upper portion of the other side of the upper core soil in the longitudinal direction of the tunnel, the first pilot pit and the second pilot pit are pushed in the excavation direction, and then the upper core soil is excavated so that a transverse channel which is perpendicular to the first pilot pit and the second pilot pit can be formed; (3) a first step group which comprisesa plurality of steps is formed by excavating the first pilot pit, and the length of each step of the first step group is 3-5 m; (4) the upper core soil is dismounted transversely, and thus a step full-section with the length being 6 m is formed; (5) downward excavation is performed below the second pilot pit, and thus a second step group which comprises a plurality of steps is formed; (6) excavation of a core soil inverted arch and construction of an inverted arch second lining are performed; and (7) tunnel large-section second lining construction is performed.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for removing the tall core soil of a submerged tunnel with a super-large section. Background technique [0002] With the rapid development of our country, the construction of urban rail transit in the construction of municipal infrastructure involves more and more large-section shallow-buried tunnels, which has become a major feature of urban construction. How to quickly and safely Building underground tunnels in cities has become an urgent problem to be solved. [0003] In the prior art, there are mainly the following two methods for excavating tunnels: the CD method of ordinary excavation for extra-large section underground excavation tunnels is to divide the large section into left and right side walls, and carry out in sections, and complete the excavation of the left side wall to form the left side support and the central tunnel. Temporary support for partition w...

AI Technical Summary

Problems solved by technology

[0004] What the present invention aims to solve is the problem of high risk and difficulty in removing the high and large core soil of tunnels in the prior art, and it is difficult to remove temporary supports. method, this method can effectively improve the construction progress, and at the same time avoid the problem of difficult demolition due to the high core soil, ensure the construction traffic organization, convenient transportation, and the core soil can play a supporting role for the longest time limit, greatly improving construction safety and ensuring the construction of the building above material security

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