Tunnel middle partition wall structure and method for staged excavation of tunnel by means of middle partition wall method

Abstract

The invention relates to a tunnel middle partition wall structure and a method for staged excavation of a tunnel by means of a middle partition wall method. One side of a tunnel primary support (4) isattached and fixed to a tunnel surrounding rock, and secondary lining is attached to the other side of the tunnel primary support (4); a first erect middle partition wall (1) and a second erect middle partition wall (2) are vertically arranged in the tunnel in parallel, and both the upper ends and the lower ends of the first erect middle partition wall (1) and the second erect middle partition wall (2) are connected with the tunnel primary support (4) separately; a cross partition wall (3) crosses with the first erect middle partition wall (1) and the second erect middle partition wall (2) and is transversely arranged in the tunnel, and both the left end and the right end of the cross partition wall (3) are connected with the tunnel primary support (4). Compared with a traditional middlepartition wall method, stress on the middle partition wall is rational, instable failure of the whole is unlikely to occur, and connection failure does not occur; a sufficient support effect on a vault can be achieved, so that vault settlement is effectively controlled. Moreover, the whole construction process of the middle partition wall is simplified, lots of manpower, material resources and time are saved, the construction progress is accelerated, and the total construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of civil engineering construction, in particular to a partition wall structure in a tunnel and a method for realizing step-by-step tunnel excavation by using the partition wall method. Background technique [0002] The partition wall method refers to the use of the temporary support of the partition wall during the excavation process to divide the section into multiple small tunnel faces and excavate them separately. This method can reduce the disturbance to the stratum and is mainly suitable for poor and unsatisfactory strata. Underground engineering construction with stable rock mass and strict ground subsidence requirements. [0003] The partition wall method is developed on the basis of the original positive step method since the 1980s, with the increase in the construction of urban underground projects, especially after the non-boring machine method was applied to the tunnel engineering of shallow burie...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the above-mentioned problems in the curved partition wall in the traditional double-side pilot pit method, to provide a tunnel partition wall structure and a method for tunnel excavation by using the partition wall method, which solves the problem of traditional In the double-side-wall pilot pit method, the force of the partition wall is unreasonable, it is not easy to be stable at the vault, and the supporting effect on the vault is insufficient. Construction requirements, and can reduce construction costs

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