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Tunnel shotcrete non-dismantling formwork and construction method thereof

A technology of sprayed concrete and free formwork, which is applied in earthwork drilling, tunnels, tunnel linings, etc., can solve the problems of difficulty in fixing shotcrete formwork, long formwork period, and slow construction progress, and reduce construction personnel and equipment investment , high-quality and rapid construction, and the effect of saving construction costs

Inactive Publication Date: 2015-04-01
SINOHYDRO BUREAU 14 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the excavation and support of the side and roof of underground tunnels, for the surrounding rocks of types VI and V, where the rock mass is broken and cracks are developed, steel supports and sprayed anchors are mostly used to strengthen the support. The traditional shotcrete uses several layers of shotcrete Or use hanging bamboo springboards or other wooden formwork to form sprayed concrete. The sprayed concrete formwork is difficult to fix, the formwork period is long, and the construction progress is slow.

Method used

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  • Tunnel shotcrete non-dismantling formwork and construction method thereof
  • Tunnel shotcrete non-dismantling formwork and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 with 2 As shown, the tunnel shotcrete free formwork includes anchor 1 and section steel support 2. Anchor 1 is the system anchor 3 and an extension anchor 4 set according to requirements. The extension anchor 4 is fixedly connected with section steel support 2, and section steel support 2 An L-shaped reinforcing steel bar 5 is set at the connecting part with the extended anchor rod 4, the long arm of the reinforced steel bar 5 is attached to the extended anchor rod 4, the short arm is attached to the bottom surface of the profiled steel support 2, and the reinforcement mesh 6 is arranged on the profiled steel support 2 On the side by the rock face, the steel mesh 6 outside lays fast and easy closing net 7.

[0025] The construction method is:

[0026] ①Use part of the tunnel system anchor rods or directly set the locking foot anchor rods and install the steel support, and effectively weld the part of the system anchor rods and the steel support firmly...

Embodiment 2

[0032] The shotcrete free formwork for tunnels includes anchor 1 and section steel support 2, anchor 1 is system anchor 3, system anchor 3 is fixedly connected with section steel support 2, and the connection between section steel support 2 and system anchor 3 is L-shaped. Reinforcing steel bar 5, the long arm of reinforcing steel bar 5 is attached to the system anchor rod 3, the short arm is attached to the bottom surface of profiled steel support 2, the reinforcement mesh 6 is arranged on the side of profiled steel support 2 close to the rock face, and the outside of reinforcement mesh 6 Lay quick and easy closing net 7.

[0033] The construction method is:

[0034] ①Use part of the tunnel system anchor rods or directly set the locking foot anchor rods and install the steel support, and effectively weld the part of the system anchor rods and the steel support firmly (single-side welding shall not be less than 10d);

[0035] ②Weld φ6.530×30cm steel mesh on the rock face side...

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Abstract

The invention relates to a tunnel shotcrete non-dismantling formwork comprising anchor bolts and a section steel support. The anchor bolts are fixedly connected to the section steel support. A reinforcing mesh is disposed on one rock side of the section steel support; a rapid and convenient reticulated permanent formwork is spread outside the reinforcing mesh. during the application of the tunnel shotcrete non-dismantling formwork in form shot concreting of an adverse geological tunnel segment, setting up a construction bent is not required, fewer constructors are needed, fewer devices are input, construction cycle is effectively shortened, landslip is effectively avoided, landslip treatment cycle is greatly shortened, and construction cost is saved. The tunnel shotcrete non-dismantling formwork is simple in structure, allows firmness of supporting, is well stable and can bear stable shock of a wet-concreting trolley in concrete shooting; the problem of rebound is solved, landslip treatment time is shortened, construction safety is ensured, and technical indicators of shotcrete can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower tunnel engineering, and in particular relates to "mould-sprayed" concrete for the side cavity of a steel-supported rock face in an unfavorable special geological tunnel section, and backfilling and compacting the side cavity of the rock face with sprayed concrete. Background technique [0002] During the excavation and support of the side and roof of underground tunnels, for the surrounding rocks of types VI and V, where the rock mass is broken and cracks are developed, steel supports and sprayed anchors are mostly used to strengthen the support. The traditional shotcrete uses several layers of shotcrete Or use hanging bamboo springboards or other wooden formwork to form sprayed concrete. The sprayed concrete formwork has difficulties in fixing, long formwork period, and slow construction progress. In view of the unfavorable special and harsh geological conditions, in orde...

Claims

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Application Information

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IPC IPC(8): E21D11/10
CPCE21D11/10E21D11/105
Inventor 金怀峰王红军刘卫东李坤鹏陈海鸥张利生林甲勇
Owner SINOHYDRO BUREAU 14 CO LTD
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