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Method for controlling floor heave through inverted arch anchoring beam

A technology of reverse bottom arch and anchoring beam, which is applied in the directions of bolt installation, earthwork drilling, wellbore lining, etc., can solve the problems that the bottom drum, the bottom beam and the anchoring can not be cooperatively carried, and the role of anchoring engineering is not considered, and achieves a large scale. The effect of support

Inactive Publication Date: 2013-01-02
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, it still treats the floor of the roadway as a flat bottom, and does not consider applying the anchoring project to the anti-bottom arch beam to deal with the bottom plate. After the roadway or chamber is subjected to the impact of mining, the floor beam and the anchor grouting cannot be carried together. Drum phenomenon is still very serious

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  • Method for controlling floor heave through inverted arch anchoring beam

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[0020] 1. Undercover. The bottom plate of the whole Matoumen area is in reverse arc shape with a radius of 8300mm. Actually, it should be slightly overcut, but the maximum amount of overbreak should not exceed 200mm. When the brush lies within 10m of the north and south sides of the well shaft, the 650mm thick side of the Matou Gate must be protected. After the excavation of the foot of the wall, the formwork must be supported in time, and the reinforced concrete should be poured. The head door design is the same.

[0021] 2. Bottom plate grouting. The depth of the grouting holes on the bottom plate is 2400mm, and each section is arranged with 2 to 3 holes, and the row spacing between the grouting holes is 1300mm×800mm; the grouting pressure is not greater than 1.5MPa; the grouting material is 525 sulphoaluminate rapid hardening cement or chemical For grout, if the water-cement ratio of sulfoaluminate rapid hardening cement is 1:0.8~1 (weight ratio); the length of the grouti...

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Abstract

The invention discloses a method for controlling a floor heave through an inverted arch anchoring beam. The method comprises the following steps of: constructing a grouting pipe, an anchor cable or a high-strength anchor rod and other prestressed anchorage systems on an inverted arch of a constructed tunnel, forming a bottom beam and an anchoring beam coupled through the prestressed anchoring function, cooperatively exerting the active and passive supporting functions, and fulfilling the aim of controlling the bottom plate for a long time. In addition, longitudinal reinforcing ribs are connected between the inverted arch beams, and concrete is poured, so that the whole control system can exert greater supporting functions. The floor heave can be effectively controlled in a developing entry with high dynamic pressure or a developing tunnel with long service time and heading engineering, and the application prospect is wide.

Description

technical field [0001] The invention relates to a method for controlling a floor drum by an anti-bottom arch anchor beam, and is especially suitable for the stability control of surrounding rocks or bottom plates of chambers in coal mines, metal mines, subways, civil air defense projects and underground space projects. Background technique [0002] The swelling of the floor of the roadway or chamber is a common problem encountered in coal mines, metal mines, subways, civil air defense projects and underground space projects. In particular, due to the influence of mining pressure during coal mining or secondary superimposed stress during roadway digging, the convergence deformation around the roadway or chamber is serious, and the bulge of the floor reaches more than half of the approaching amount of the roof and floor, or even reaches 90%. Roadways or chambers need to be repaired every 2 to 3 months, and the amount of repair work even exceeds the amount of newly excavated ro...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21D20/02E21D21/00
Inventor 郑西贵张农吴继忠窦红平赵金明杨高干
Owner CHINA UNIV OF MINING & TECH
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