Gate-type roof brushing construction method of extreme weak and broken surrounding rock layer
A portal type and construction method technology, applied in the direction of shaft lining, tunnel lining, underground chamber, etc., can solve the problems of secondary lining large bias load, large over-excavation area, and long time consumption, so as to increase the self-supporting force of surrounding rock , control the deformation of the surrounding rock and shorten the connection distance
Inactive Publication Date: 2019-03-01
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology
In the traditional roof construction, vertical portal steel frames are often used at the junction of cross passages and tunnels, but the distance between the vertical portal steel frames and the trapezoidal scaffolding is relatively long, and the connected steel will be subject to large shear stress from the upper surrounding
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[0026] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0027] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0028] In the present invention, unless stated to the contrary, the used orientation words such as "up, down, top, bottom" generally refer to the directions shown in the drawings or refer to the vertical, perpendicular or gravitational directions The terms used to describe the mutual positional relationship of the various components mentioned above.
[0029] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0030] figure 1 Ac...
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The invention provides a gate-type roof brushing construction method of an extreme weak and broken surrounding rock layer. The gate-type roof brushing construction method of the extreme weak and broken surrounding rock layer comprises the following steps that S(1) a parallel pilot tunnel and a transverse channel are excavated by adopting a three-step method, and the parallel pilot tunnel and transverse channel support is constructed; S(2) a special-shaped gate-type supporting frame attached to a main hole outline is erected at a connecting position of the transverse channel and a main hole; S(3) a trapezoidal pilot tunnel of the main hole is excavated by adopting the three-step method along a hole top arc outline of the main hole in the width direction of the main hole, and temporary support is constructed on the trapezoidal pilot tunnel; S(4) primary support and secondary support are constructed on the trapezoidal pilot tunnel completing the temporary support; S(5) the main hole is excavated by adopting the three-step method separately facing the directions of large mileage and small mileage; and S(6) secondary lining is constructed on the main hole formed by the excavation. The gate-type roof brushing construction method of the extreme weak and broken surrounding rock layer can open up a new working surface, the special-shaped gate-type supporting frame used in the gate-typeroof brushing construction method improves the construction efficiency of a tunnel, and stress at the connecting position of the transverse channel and the main hole is intensified.
Description
technical field [0001] The invention relates to the field of tunnel construction, in particular to a door-type roofing construction method for extremely weak and broken surrounding rock layers. Background technique [0002] With the continuous development of my country's transportation construction, the number of extremely weak and broken surrounding rock tunnels in the project is increasing and the length is increasing. In order to complete the construction tasks within the tight construction period, it is often necessary to open up new working faces. The method of the new working surface is particularly important. In the traditional roof construction, vertical portal steel frames are often used at the junction of cross passages and tunnels, but the distance between the vertical portal steel frames and the trapezoidal scaffolding is relatively long, and the connected steel will be subject to large shear stress from the upper surrounding rock , and produce a large bending mo...
Claims
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Login to view more IPC IPC(8): E21D9/04E21D11/10
CPCE21D9/04E21D11/10E21D11/107
Inventor 吴佳峰闫志刚张隽赵香萍徐大成张宁强韩东岭常士周汲德亮
Owner CHINA RAILWAY 12TH BUREAU GRP
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