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Drilling, grouting and sand-throwing process of ground surface of mined-out region under highway

A drilling technology for highways and ground surfaces, which is applied in infrastructure engineering, construction, soil protection, etc., can solve the problem of high cost of full filling materials, and achieve the effect of reducing costs

Active Publication Date: 2010-08-18
CHINA RAILWAY NO 2 ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material cost of full filling is higher

Method used

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  • Drilling, grouting and sand-throwing process of ground surface of mined-out region under highway
  • Drilling, grouting and sand-throwing process of ground surface of mined-out region under highway
  • Drilling, grouting and sand-throwing process of ground surface of mined-out region under highway

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Experimental program
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Embodiment Construction

[0032] Such as figure 1 , 2 Shown:

[0033] 1. Surface drilling, grouting and sand throwing technology in gobs under the expressway, including drilling, pulping and grouting and sand throwing technology, of which:

[0034] Drilling includes fixed point, drilling rig installation and hole forming,

[0035] Fixed point: use theodolite or total station measuring instrument to carry out field stakeout according to the designed hole position;

[0036] Drilling rig installation: find out the hole position according to the mark set in stakeout, and install the drilling rig;

[0037] Hole forming: After the drilling rig is positioned, use a composite drill bit to open the hole, maintain the wall of the hole with the retaining conduit, drill to the lower retaining conduit 3-5m away from the stable bedrock, and reduce the drilling diameter at the lower part to 89mm. The final hole of the roof of the drop belt or goaf;

[0038] 2. The pulping process is carried out according to the ...

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Abstract

The invention discloses a drilling, grouting and sand-throwing process of the ground surface of a mined-out region under a highway, comprising a drilling process, a slurry preparation process and a grouting and sand-throwing process, wherein the grouting and sand-throwing process comprises the steps of installing a sand thrower, grouting in a hole cleaning mode, grouting and throwing sand and pressing slurry. The invention combines with the specific geographical condition that a great amount of aeolian sand exists in the construction of highway sections to utilize the aeolian sand as a main material for filling the mined-out region, thereby achieving the purpose of greatly reducing cost.

Description

[0001] technical field [0002] The invention belongs to the technical field of geological disaster remediation, and in particular relates to a surface drilling, grouting and sand throwing process in goafs under expressways. Background technique [0003] The mined-out area refers to the hollow area left after the underground minerals are mined. After the ore body is mined, three zones are formed upward from the roof layer: the caving zone, the water-conducting fissure zone and the bending zone, bringing a series of environmental rocks. Civil engineering problems, such as water accumulation on flat ground, cracks in roads, house collapses, reduction of arable land, and reduction of farmland production, have left great hidden dangers for engineering construction in mining areas. There are mainly the following methods for the management of goaf areas: [0004] 1. Full filling method: fully fill the goaf to support the overlying rock, so as to completely eliminate the hid...

Claims

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Application Information

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IPC IPC(8): E02D3/12
Inventor 黄俊文肖均全孝高文宗
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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