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Pre-empty soft rock tunnel supporting structure and construction method thereof

A technology for roadway support and roadway, which is applied to the support structure of pre-empty soft rock roadway and its construction field, can solve problems such as failure to achieve supporting effect, stress concentration, accelerated roadway damage, etc., so as to reduce the difficulty of laying and improve the support Strength, the effect of improving support strength

Active Publication Date: 2022-01-11
HUATING COAL GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The two bottom corners of the U-shaped support frame widely used in traditional support structures are the intersection point of stress transmission, the sensitive area for sharp corner effect and the foothold of the roadway support surrounding rock vector, which is prone to stress concentration and helps The deformation of the bottom corner of the wall will accelerate the destruction of the roadway and fail to achieve the ideal support effect

Method used

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  • Pre-empty soft rock tunnel supporting structure and construction method thereof
  • Pre-empty soft rock tunnel supporting structure and construction method thereof
  • Pre-empty soft rock tunnel supporting structure and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0035] The steel arch (2) is a track steel structure; compared with the I-shaped steel structure, the support strength of the track steel is higher.

[0036] The number of the V-shaped frame (4) is the same as that of the steel arch frame (2). The V-shaped frame (4) is composed of two intersecting vertical steel materials. The intersection of the two intersecting vertical steel materials is It is the middle end of the V-shaped frame (4); the V-shaped frame (4) can be simultaneously subjected to the pressure from below and the external tension generated by the steel arch (2) caused by the downward pressure of the roof of the roadway, limiting the steel arch (2) The bottom corners move outward.

Embodiment 3

[0038] Both ends of the V-shaped frame (4) are welded to connect the bottom corners of the steel arch (2), and two steel materials in the V-shaped frame (4) are welded and connected.

Embodiment 4

[0040] The two ends of the V-shaped frame (4) are fixedly connected to the bottom corners of the steel arch frame (2) by bolts, and the two steel materials in the V-shaped frame (4) are fixedly connected to each other by bolts; welding / bolts can increase the steel The connection strength of the arch frame (2) and the V-shaped frame (4), thereby enhancing the support strength of the roadway (1).

[0041] The connecting plate (13) is composed of a plurality of W-shaped steel strips installed in equal intervals along the side walls of the roadway. The longitudinal section of the clamping plate (20) is a V-shaped structure, and one end of the clamping plate (20) The side of the side is fixed with a bump structure that is fitted in the groove of the connecting plate (13); on the one hand, the connecting plate (13) composed of multiple W-shaped steel strips can improve the support strength of the side wall, and on the other hand On the other hand, multiple prestressed anchor rods (9...

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Abstract

The invention belongs to the technical field of soft rock tunnel supporting, and particularly relates to a pre-empty soft rock tunnel supporting structure and a construction method thereof. The pre-empty soft rock tunnel supporting structure comprises a tunnel, a connecting plate and a steel arch are arranged on the inner surface of the tunnel, a reinforcing groove is formed below the tunnel, a base angle pressure relief groove is formed in a base angle, and the bottom end of the steel arch and the two ends of a V-shaped frame are arranged in the base angle pressure relief groove; and the middle end of the V-shaped frame is arranged in the reinforcing groove, a pre-stressed anchor rod and an anchor cable are fixedly installed in a grouting layer arranged on the surrounding rock face of the tunnel, a concrete sealing layer is sprayed on the inner side of a steel wire rope net hung to the pre-stressed anchor rod and the anchor cable, and a clamping plate clamped with the connecting plate is connected with a cover plate through a connecting bolt. A gas and water pipeline system and a power cable system are installed between the cover plate and the connecting plate. According to the pre-empty soft rock tunnel supporting structure and the construction method thereof, the approximately triangular supporting face composed of the steel arch and the V-shaped frame is good in stress balance and high in supporting force on surrounding rock, the connecting plate and the cover plate opened through a special tool can safely and effectively utilize the base angle space of the steel arch, and the laying difficulty of pipelines and power cables is lowered.

Description

technical field [0001] The invention belongs to the technical field of soft rock roadway support, and in particular relates to a preemptive soft rock roadway support structure and a construction method thereof. Background technique [0002] With the expansion of the coal mine mining area, the mining depth continues to increase, and the mining conditions become more and more difficult, especially the superimposed pressure brought by the self-expansion of the weak rock and coal body under the mining stress, which has been brought about by the large buried depth, complex structure and mining stress. It is a problem that plagues coal mine roadway support. Because these pressures have differences in time speed and force magnitude and direction, they are not isochronous and uneven superimposed pressure combinations. The roadway support will be repeatedly damaged under the action of this uneven superimposed pressure, and the conventional support technology is difficult to ensure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10E21D11/20E21D20/00E21F17/02H02G9/08
CPCE21D11/006E21D11/10E21D11/107E21D11/20E21D20/00E21F17/02H02G9/08
Inventor 许强李明远吴军马进生田斌李鹏赵凤李小刚赵辉强莫正虎胡长岭
Owner HUATING COAL GRP
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