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Large deformation tunnel two-step and inverted arch construction method

A construction method and large deformation technology, applied in tunnels, earth-moving drilling, mining equipment, etc., can solve the problems of reduced deformation rate, large deformation, slow driving speed, etc., to achieve reduced convergence value, small cumulative deformation, closed-loop less time effect

Inactive Publication Date: 2017-06-13
中铁五局集团成都工程有限责任公司
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Problems solved by technology

[0003] In order to solve the technical problems of existing large-deformation tunnels excavated by the three-step method that the initial branch deforms a lot before it is closed and forms a ring, the deformation rate decreases after the loop is closed, and the excavation speed is too slow. Construction method of large deformation tunnel with two steps and inverted arch with less deformation after closed loop and faster excavation speed

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  • Large deformation tunnel two-step and inverted arch construction method
  • Large deformation tunnel two-step and inverted arch construction method
  • Large deformation tunnel two-step and inverted arch construction method

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Embodiment Construction

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0024] See figure 1 and figure 2 ,among them figure 1 It is a front view of an embodiment of the two-step invert construction structure of a large deformation tunnel provided by the present invention; figure 2 Yes figure 1 The side view of the large deformation tunnel with two steps with invert construction structure shown.

[0025] The two-step inverted arch construction structure 1 of the large deformation tunnel includes a tunnel 11, a...

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Abstract

The invention provides a large deformation tunnel two-step and inverted arch construction structure and a construction method. The large deformation tunnel two-step and inverted arch construction method comprises the following steps of (1) excavating two steps: dividing a tunnel surface into the two steps according to a surrounding rock situation, and excavating; (2) excavating and adjusting the upper step, the lower step and an inverted arch: adjusting the height and the length of the upper step, one-through excavating and forming the lower step and an inverted archprimary support, and adjusting the heights and the lengths of the lower step and the inverted arch; (3) synchronously constructing the upper step, the lower step and the inverted arch. The large deformation tunnel two-step and inverted arch construction structure and the construction method provided by the invention adopt a two-step inverted arch structural steel frame, with an inverted arch, which is less in closed loop time, less in accumulated deformation when being converged, and improved in monthly tunneling degree.

Description

Technical field [0001] The invention belongs to the field of construction engineering, and in particular relates to a construction method of a large deformation tunnel with two steps with inverted arches. Background technique [0002] The large deformation tunnel was excavated with the original three-step method. The height of the upper step is 4.45m, the height of the middle step is 3.10m, and the height of the lower step is 3.10m. The length of the upper step is maintained at 5m, the length of the middle step is maintained at 5m, and the length of the lower step is maintained at 10m. The disadvantage is that it takes 16 days from the excavation face to the closing of the initial support of the invert to form a ring. Tests show that the deformation of the large deformation tunnel is the largest before the initial support of the invert is closed and the deformation rate is significantly reduced after the closed ring. The three-step method process is not conducive to on-site cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/14E21D9/00
CPCE21D9/00E21D9/14
Inventor 罗宁宁夏平罗康勇
Owner 中铁五局集团成都工程有限责任公司
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