Retractable concrete arch and anchor rod combined support system and construction method

A combined support and concrete technology, applied in the installation of bolts, earthwork drilling, wellbore lining, etc., can solve the problems of low rigidity, slow construction speed, and high labor intensity of anchor net and cable support, and achieve the support structure. Simple and reliable, low labor intensity of workers, high degree of mechanization

Active Publication Date: 2011-02-16
XIAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rigidity of anchor net cable support is not high, and the muddy surrounding rock is prone to cementation, which will lead to the failure of anchor cable anchorage; the shotcrete support has low strength and large dust; the cost of steel support is high; large deformation
Soft rock ro

Method used

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  • Retractable concrete arch and anchor rod combined support system and construction method
  • Retractable concrete arch and anchor rod combined support system and construction method
  • Retractable concrete arch and anchor rod combined support system and construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A combined support system of shrinkable concrete slabs and bolts, the double-layer fiber flexible formwork 5 is made of high-strength fiber cloth according to the length of the tunnel perimeter to make a cuboid structure, with bolt holes 8 and inner pouring ports 9 And the outer pouring port 10, during construction, the double-layer fiber flexible formwork 5 is continuously laid close to the surrounding rock, the inner side of which is laid with a reinforcement mesh 6, the anchor rod 3 passes through the reinforcement mesh 6, and the double-layer fiber flexible formwork 5 is connected with the surrounding rock 4, Concrete 1 is pumped into the inner space 11 of the double-layer fiber flexible formwork 5 through a concrete pump through the delivery pipe and the inner layer pouring port 9 to form a concrete layer, and after the concrete 1 is solidified, it is pumped into the outer space 12 of the double-layer fiber flexible formwork 5 Injecting foamed concrete forms a highl...

Embodiment 2

[0041] A combined support system of shrinkable concrete slabs and bolts, the double-layer fiber flexible formwork 5 is made of high-strength fiber cloth according to the length of the tunnel perimeter to make a cuboid structure, with bolt holes 8 and inner pouring ports 9 And the outer pouring port 10, the double-layer fiber flexible formwork 5 is laid at intervals close to the surrounding rock 4 during construction, and the steel mesh 6 is laid outside it, the anchor rod 3 passes through the steel mesh 6, and the double-layer fiber flexible formwork 5 is connected to the surrounding rock 4 , and there is a row of anchor rods 14 between two adjacent double-layer fiber flexible formworks 5, and the concrete pump is used to pump concrete 1 to the inner space 11 of the double-layer fiber flexible formwork 5 through the delivery pipe and the inner layer pouring port 9 to form a concrete layer. After the concrete 1 is solidified, foamed concrete is pumped into the outer space 12 of ...

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Abstract

The invention discloses a retractable concrete arch and anchor rod combined support system and a construction method. A retractable concrete arch is compounded by a double-layer material, one layer is a concrete layer, and the other layer is a high-pressure retractable material layer; an anchor rod passes through the concrete layer and the high-pressure retractable material layer and is connectedwith surrounding rock to form the retractable concrete arch and anchor rod combined support system. The method comprises the following steps of: pumping normal concrete or fast hardening concrete into an inter-layer space of a double-layer fiber flexible template through a delivery pipe and an inner-layer perfusion opening by a concrete pump; and after the concrete is solidified, pumping foam concrete or yellow mud into an outer-layer space of the double-layer fiber flexible template. The retractable concrete arch and anchor rod combined support system has a simple and reliable support structure, is convenient to construct, has high mechanization degree, is suitable for supporting soft rock and large-ground pressure and large-deformation underground engineering, and is widely used for supporting mine roadways, traffic tunnels and underground engineering such as water conservation, national defense and the like, and the labor intensity of workers is low.

Description

technical field [0001] The invention relates to underground engineering support, in particular to a combined support system and construction method of shrinkable concrete slabs and bolts. Background technique [0002] Traditional underground soft rock well roadways and chambers, and mining roadways that are greatly affected by mining pressure generally use anchor net cables, shotcrete, steel supports, masonry and their combinations to support the surrounding rock. The rigidity of anchor net cable support is not high, and the muddy surrounding rock is prone to cementation, which will lead to the failure of anchor cable anchorage; the shotcrete support has low strength and large dust; the cost of steel support is high; Great deformation. Soft rock roadways generally adopt secondary support, the primary support generally adopts anchor net spraying, and the secondary support adopts shotcrete, masonry, steel bracket or grouting. The construction speed is slow, the process is com...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D21/00
Inventor 王晓利吴玉意
Owner XIAN UNIV OF SCI & TECH
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