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Supporting structure for composite anchor mesh steel bar support of deep well high-stress soft rock roadway and construction method thereof

A support structure and steel support technology, applied in the direction of tunnel, shaft lining, tunnel lining, etc., can solve the problems of insufficient support capacity, complex support technology, increased engineering quantity and cost, etc., and achieve the effect of strong engineering practicability

Inactive Publication Date: 2017-05-31
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The support capacity of the commonly used bolt-net-sprayed support structure is obviously insufficient. Generally, anchor-sprayed steel support or surrounding rock grouting or long anchor cables are used for joint support. Similar situations occur in tunnel engineering, which makes the support The maintenance technology is becoming more and more complex, and the engineering volume and cost have also increased significantly.

Method used

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  • Supporting structure for composite anchor mesh steel bar support of deep well high-stress soft rock roadway and construction method thereof
  • Supporting structure for composite anchor mesh steel bar support of deep well high-stress soft rock roadway and construction method thereof
  • Supporting structure for composite anchor mesh steel bar support of deep well high-stress soft rock roadway and construction method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment one, construction method comprises the following steps:

[0043] A) Excavate the roadway 10 according to the shape and size of the section of the roadway 10, and spray a 50mm thick concrete leveling layer 20 on the section of the roadway 10. The concrete leveling layer 20 plays the role of sealing the surrounding rock, and prevents the surrounding rock from absorbing water, swelling, weathering and surface danger. The rock collapse can reduce the unevenness of the roadway surface and improve the closeness between the steel mesh 40 and the surrounding rock surface. The strength grade of the shotcrete leveling layer 20 is C20, and the mix ratio is cement: melon seeds: sand: water = 1:2 : 2: 0.45, and mixed with 2.5% cement amount of quick-setting agent;

[0044] B) The anchor rod 31 and the anchor cable 32 are used to support the surrounding rock, and a certain length of the surrounding rock is exposed, and the exposed length is 60mm, so as to improve the shear...

Embodiment 2

[0057] Anchor rod 31 is a high-strength prestressed anchor rod with a diameter of Φ22mm, a total length of 2800mm, a spacing of 700mm, and a row spacing of 700mm. It is arranged in a plum blossom shape with a prestressed force of 70kN. Φ22mm, the total length is 8000mm, the prestress is 180kN, the length of steel mesh 40 is 12m, the width is 5m, it is welded by steel bars, the welding distance is 200mm, the diameter of steel bars is Φ22mm, every two pieces of steel mesh 40 The connection length is 200mm, the length of the polyester fiber net 50 is 12m, and the width is 5m. It is woven by polyester fiber silk. The width of the polyester fiber silk is 15mm. The mesh of the polyester fiber net 50 is rectangular. The specification of hole is 200mm * 200mm, and the overlapping length of every two polyester fiber nets 50 is 200mm, and the design strength of concrete leveling layer 20 is C20, and the design strength of the first sprayed concrete layer 71 and the second sprayed concret...

Embodiment 3

[0060] Anchor rod 31 is a high-strength prestressed anchor rod with a diameter of Φ20mm, a total length of 2500mm, a spacing of 700mm, and a row spacing of 700mm. It is arranged in a plum blossom shape with a prestressed force of 60kN. Φ20mm, the total length is 8000mm, the prestress is 180kN, the length of steel mesh 40 is 10m, the width is 4m, it is welded by steel bars, the welding distance is 150mm, the diameter of steel bars is Φ20mm, every two pieces of steel mesh 40 The splicing length is 150mm, the length of the polyester fiber net 50 is 10m, and the width is 4m. It is woven by polyester fiber silk. The width of the polyester fiber silk is 15mm. The mesh of the polyester fiber net 50 is rectangular. The specification of hole is 150mm * 150mm, and the overlapping length of every two polyester fiber nets 50 is 150mm, and the design strength of concrete leveling layer 20 is C20, and the design strength of the first sprayed concrete layer 71 and the second sprayed concrete ...

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Abstract

The invention provides a supporting structure for a composite anchor mesh steel bar support of a deep well high-stress soft rock roadway and a construction method thereof. Firstly, anchor rods and anchor ropes are stroke into the interior of surrounding rock, and the set length is exposed; then, steel bar meshes and polyester fiber meshes are laid and hung through the outward-exposing portion of the anchor rods and the anchor ropes, the steel bar meshes are closely attached to the surrounding rock to be laid, and the polyester fiber meshes are closely attached to the steel bar meshes to be laid; a steel bar mesh shell support is erected; the anchor rods and the anchor ropes pass through the steel bar meshes, the polyester fiber meshes and the steel bar mesh shell support in sequence and are fixed on the steel bar mesh shell support through trays and nuts; a first concrete shotcrete layer is poured to close the whole supporting structure, and initial supporting is finished; and finally, a second concrete shotcrete layer is poured, and second supporting is finished. Through initial supporting, the whole structure and the surrounding rock deforms jointly, the yielding effect is given play, and surrounding rock pressure is released, and then second supporting is conducted. Meanwhile, the flexibility and pressure releasing effects of the polyester fiber meshes are utilized, so that the surrounding rock pressure is evenly distributed in the whole supporting system.

Description

technical field [0001] The invention belongs to the technical field of mine roadway and tunnel support, and in particular relates to a composite anchor net reinforcement support structure and a construction method for a deep well high-stress soft rock roadway. Background technique [0002] At present, as the depth of mine mining continues to increase, more and more roads are excavated in deep high-stress soft rocks. Due to strong ground pressure and weak strata, the stability and bearing capacity of the support structure need to be greatly enhanced. The support capacity of the commonly used bolt-net-sprayed support structure is obviously insufficient. Generally, anchor-sprayed steel brackets or surrounding rock grouting or long anchor cables are used for joint support. Similar situations occur in tunnel engineering, which makes the support The maintenance technology is becoming more and more complex, and the engineering volume and cost have also increased significantly. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D21/00E21D11/15E21D11/10C04B28/00
CPCE21D11/00C04B28/00E21D11/10E21D11/105E21D11/152E21D21/0026
Inventor 姚韦靖何壮志庞建勇
Owner ANHUI UNIV OF SCI & TECH
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