Preliminary tunnel support structure with internal box type steel frames

An initial support and steel frame technology, applied in tunnels, tunnel linings, mining equipment, etc., can solve problems such as large difference in bending stiffness, buckling instability of supporting medium-shaped steel frames, and initial support failure, etc. Increase the bending stiffness and compressive strength of the section to ensure the effect of gripping

Inactive Publication Date: 2016-10-26
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0004] In recent years, investigations on railways such as Liuzhan, Lanyu, Chenglan, Yungui, and Changkun have found that for some tunnels passing through weak and broken surrounding rock, fault fracture zone, and soft rock with high ground stress, the initial support of medium-sized steel frames Buckling instability often occurs, leading to primary support failure
The reason is that since the section steel frame is I-shaped or H-shaped, the bending rigidity of its section in the X direction and Y direction is quite different, and because it is difficult to ensure that the I-shaped steel or H-shaped steel is sprayed at the junction of the tunnel side flange and the web. The concrete is dense, so the grip force of the shotcrete on the steel frame cannot be effectively exerted

Method used

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  • Preliminary tunnel support structure with internal box type steel frames
  • Preliminary tunnel support structure with internal box type steel frames
  • Preliminary tunnel support structure with internal box type steel frames

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] refer to figure 1 and figure 2 , a tunnel primary support structure with a box-shaped steel frame inside, including a shotcrete layer 20 covering the rock 10 around the hole, and steel frames buried in the shotcrete layer 20 at intervals along the tunnel excavation direction. refer to image 3 , the steel frame is a box-shaped steel frame 30 whose cross section is rectangular, and the box-shaped steel frame 30 is composed of a pair of flange plates 30a and webs 30b that are perpendicular to each other and welded as one. The box-shaped steel frame 30 Filling concrete (31) is poured inside except the vault section 32.

[0018] refer to Figure 4 , the box-shaped steel frame 30 is composed of a buttted left side wall section 33 , a vault section 32 and a right side wall section 34 , and the left side wall section 33 and the right side wall sect...

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PUM

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Abstract

Provided is a preliminary tunnel support structure with internal box type steel frames. The stress performance of a preliminary support can be effectively improved, the steel frames are protected against buckling instability, and the structural strength of the preliminary support can be given to full play. The preliminary tunnel support structure comprises a sprayed concrete layer covering rock surrounding a cave, and the steel frames buried in the sprayed concrete layer at intervals in the tunnel excavating direction. Each steel frame is the box type steel frame with the rectangular cross section, and each box type steel frame is composed of a pair of flange plates and webs, wherein the flange plates and the webs are perpendicular and welded into a whole; and filling concrete is poured into the portions, except vaults, of the interiors of the box type steel frames.

Description

technical field [0001] The invention relates to tunnels, in particular to a tunnel primary support structure. Background technique [0002] At present, underground excavation tunnels are basically constructed according to the principle of the new Austrian method, using composite lining support, including primary support and secondary lining. Among them, the support system composed of primary support and surrounding rock is the main bearing structure, and the secondary lining is mainly used as a safety reserve. [0003] The initial support is mainly composed of shotcrete layer, bolts and steel mesh combined support (referred to as shotcrete support). When the tunnel passes through unfavorable geological sections and weak broken zones, I-beams are generally installed in the shotcrete. , H-shaped steel and other auxiliary measures. [0004] In recent years, investigations on railways such as Liuzhan, Lanyu, Chenglan, Yungui, and Changkun have found that for some tunnels passi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10
CPCE21D11/003E21D11/107
Inventor 卿伟宸钟昌桂吴华高杨朱勇张磊郑伟孟祥磊曾宏飞黄华郑尚峰王芳
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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