Construction method for highway to pass through coal seam goaf

A technology of expressway and construction method, which is applied in the direction of mining equipment, earthwork drilling, filling, etc., can solve the problems that there is no construction technology in the goaf, and it is difficult to ensure the construction quality in the goaf, so as to avoid poor hole quality, Avoid untimely correction and ensure the effect of stability

Inactive Publication Date: 2020-11-27
NO 3 ENG COMPANY OF CHINA RAILWAY NO 8 ENG GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, it is difficult to guarantee the construction quality in the construction of goafs, and there is no corresponding construction technology for multi-single-layer and multi-layer goafs

Method used

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  • Construction method for highway to pass through coal seam goaf
  • Construction method for highway to pass through coal seam goaf
  • Construction method for highway to pass through coal seam goaf

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Goaf 1 has 249,000 meters of drilling holes, the depth of the holes ranges from 101m to 205m, and the grouting volume is 197,000 cubic meters. Goaf 1 is treated by drilling and grouting. Drilling uses 220 down-the-hole drilling rig or XY-4 geological drilling rig, and grouting uses 250 and 350 mud pumps.

[0071] 1. Construction technology and requirements

[0072] 1.1 fixed point

[0073] The grouting hole shall be measured and set out on the spot by GPS or total station. For the general grouting hole, the actual hole position shall not deviate from the design position by 0.5m. When the borehole cannot be placed in the designed position because of the influence of the terrain, the boreholes that can be in place around it should be constructed first, and then adjusted according to the situation of the goaf 1 exposed by drilling.

[0074] 1.2 Hole forming process and technical requirements

[0075] (1) Hole forming and casting orifice pipe

[0076] For the single-la...

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Abstract

The invention belongs to the technical field of highway construction, and particularly relates to a construction method for a highway to pass through a coal seam goaf. The method includes the following steps that S1, first-section perforating is carried out on a surface section and then second-section perforating is carried out; S2, a grouting pipe with a flange is laid down, and cement slurry isinjected for stabilization; S3, filling slurry is injected to the goaf from the interior of the grouting pipe; as for a multi-layer goaf, S4, first-section perforating is carried out on a surface section; S5, cement slurry is injected into a hole for stabilization, the grouting pipe is laid down, and the hole is cleaned to a caving zone or the interior of the goaf; S6, filling slurry is injected;and S7, the following steps are sequentially carried out that the hole is drilled to a goaf in a next layer, and then filling slurry is injected into the goaf in the next layer. The construction method for the highway to pass through the coal seam goaf improves the construction efficiency of the single-layer goaf and improves the construction quality of the multi-layer goaf.

Description

technical field [0001] The invention belongs to the technical field of expressway construction, and in particular relates to a construction method for an expressway crossing a goaf section of a coal seam. Background technique [0002] With the planning and development of the national expressway network, the construction of expressways in my country has developed from plains to mountainous areas, and the influence of goafs on highway construction has become more and more prominent. The survey, stability evaluation, treatment design, construction and The understanding of detection and other aspects varies greatly depending on the type, scale and mining conditions of the goaf. [0003] The mined-out area is a hidden, complex, unfavorable geological site with a large range of surface deformation and prone to geological disasters, which is very harmful to ground buildings and roads. Therefore, the engineering construction of gobs is difficult and the cost of treatment is high, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/00E21F15/08E21F15/10E21B19/24E21B17/00E21B7/10
CPCE21F15/00E21F15/005E21F15/08E21F15/10E21B19/24E21B17/006E21B7/10
Inventor 耿超马文荣付成开赵志曾伯川兰勇邓存俊刘波艾军孙尧李武宏曾祥军陈运杨杰文道华马元虎刘佳萍戴俊彦
Owner NO 3 ENG COMPANY OF CHINA RAILWAY NO 8 ENG GRP
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