Tunnel steel arch frame lock foot anchoring stock net-spraying composite structure

A technology of locking foot anchor rod and combined structure, which is applied in tunnels, tunnel lining, installation of anchor rods, etc., can solve problems such as affecting the effect of support, and achieve the benefits of construction safety and structural stability, reduction of project cost, and great academic value. Effect

Inactive Publication Date: 2008-07-30
CHANGAN UNIV
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Problems solved by technology

Greatly affected the perform

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  • Tunnel steel arch frame lock foot anchoring stock net-spraying composite structure
  • Tunnel steel arch frame lock foot anchoring stock net-spraying composite structure
  • Tunnel steel arch frame lock foot anchoring stock net-spraying composite structure

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Embodiment Construction

[0029] In the present invention, under the condition of weak surrounding rocks (levels IV, V, VI surrounding rocks), the initial support is changed from the form of bolt-sprayed support (system anchor + shotcrete + steel mesh + steel arch) to steel sprayed support. The form of protection (steel arch + locking foot anchor (pipe) + steel mesh + shotcrete), that is, the system anchor is canceled and replaced by the locking foot anchor (pipe) at the joint of the steel arch frame. Referring to Fig. 1 and Fig. 2, it includes a steel arch 5, on which a steel mesh 4 is arranged, at the joint 2 of the steel arch 5 is provided with a locking anchor rod (pipe) 1, and around the steel arch 5 is a shotcrete layer 6. A molded concrete layer 8 is outside the shotcrete layer 6, and a waterproof layer 7 is provided between the shotcrete layer 6 and the molded concrete layer 8. During actual use, after the tunnel is excavated, the concrete is sprayed first, then the steel arch 5 is erected, the...

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Abstract

The invention relates to a tunnel steel arch locking bolt mesh spraying combined structure, which can greatly shorten the construction period, lower the construction difficulty, benefit for the construction safety and the structure stabilization and obviously lower the construction cost. The invention comprises steel arches, wherein, a steel mesh is arranged on the steel arches; the joint point of the steel arches is provided with a locking bolt (anchor pipe); the periphery of the steel arches is provided with a sprayed concrete layer; a formworking concrete layer is arranged outside the sprayed concrete layer; a waterproof layer is arranged between the sprayed concrete layer and the formworking concrete layer.

Description

1. Technical field: [0001] The invention relates to a tunnel support structure, in particular to a tunnel steel arch frame locking foot anchor rod mesh spray combined structure. 2. Background technology: [0002] Since the use of bolt support in underground engineering in the 1940s, bolt reinforcement technology has developed very rapidly, and has now become a major support form in underground engineering support. In the underground engineering support in the United States and Australia, bolt support accounts for more than 90%. In countries such as Western Europe, Central Europe, and Japan, the traditional support method is metal brackets. In the past 30 years, bolt support in these countries also has Great development, and become the main form of underground support. [0003] my country's bolt reinforcement technology started as early as the mid-1950s. At that time, mechanical metal bolts were mainly used, and the development speed was slow. From the 1970s to the end of t...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21D11/18E21D21/00
Inventor 陈建勋罗彦斌
Owner CHANGAN UNIV
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