Tunnel primary support structure with built-in steel pipe frame

A primary support and steel frame technology, applied in tunnels, tunnel linings, mining equipment, etc., can solve problems such as buckling instability of medium-sized steel frames, large differences in bending stiffness, and primary support damage. Symmetrical flexural rigidity, increase section flexural rigidity and strength, and ensure the effect of gripping

Inactive Publication Date: 2016-08-24
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 si...

Method used

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  • Tunnel primary support structure with built-in steel pipe frame
  • Tunnel primary support structure with built-in steel pipe frame
  • Tunnel primary support structure with built-in steel pipe frame

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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 kind of tunnel initial support structure with steel pipe steel frame built in the present invention, comprises the shotcrete layer 20 covering the rock 10 around the hole, and the steel frames embedded in the shotcrete layer 20 at intervals along the tunnel excavation direction. refer to image 3 , the steel frame is a steel pipe steel frame 30 with a circular cross section. refer to Figure 4 , the steel pipe steel frame 30 is composed of the butt left side wall section 33 , the vault section 32 and the right side wall section 34 , and the left side wall section 33 and the right side wall section 34 are filled with concrete 31 . refer to Figure 5 , the steel pipe steel frame 30 is composed of the butt left side wall section 33, the vault section 32, the right side wall section 34 and the inverted arch se...

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Abstract

The invention discloses a tunnel primary support structure with a built-in steel pipe frame, and aims to effectively improve mechanical properties of a primary support, avoid buckling instability of a steel frame and fully achieve the structural strength of the primary support. The tunnel primary support structure comprises a sprayed concrete layer covering cave surrounding rock, and steel frames embedded in the sprayed concrete layer at intervals in the tunnel excavation direction, and is characterized in that the steel frames are steel pipe frames of which the cross sections are circular; the steel pipe frame consists of a left-side wall section, an arch top section and a right-side wall section which are butted with one another, or consists of a left-side wall section, an arch top section, a right-side wall section and an inverted arch section which are butted with one another; the left-side wall section, the right-side wall section and the inverted arch section of the steel pipe frame are filled with concrete.

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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IPC IPC(8): E21D11/18
CPCE21D11/18
Inventor 卿伟宸黄华张磊孟祥磊曾宏飞钟昌桂郑伟李泽龙张慧玲王芳邸成郑尚峰
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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