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A construction method for tunneling with hexagonal section of roadway

A hexagonal and cross-section technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as insufficient side control, reduce maintenance workload, optimize roadway section shape, and reduce support workload Effect

Active Publication Date: 2020-08-11
INNER MONGOLIA YITAI COAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of this application is to provide a tunneling construction method for the hexagonal section of the roadway, which is used to solve the problem of insufficient control of the existing rectangular section to the side

Method used

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  • A construction method for tunneling with hexagonal section of roadway
  • A construction method for tunneling with hexagonal section of roadway
  • A construction method for tunneling with hexagonal section of roadway

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no. 1 example

[0035] For this application, it needs to be stated that:

[0036] After the coal seam is excavated, the roof of the roadway is suspended, and the pressure of the roof is transferred to the coal walls on both sides. The pressure on the coal walls increases, forming a pressurized area. Under the action of the additional load, part of the coal is crushed into flakes. And squeeze into the roadway space or fall off, this phenomenon is called the film gang. Excavation of the working face of the positive step: When the working face of the positive step is excavated, the upper step is advanced, and the advanced part can be maintained by anchor spraying or other temporary supports; after the lower step is excavated, the entire section is permanently supported. If the roof is not stable enough, permanent support for the arch can be built in the advanced part, and the wall can be built to connect the arch after the steps are excavated.

[0037] Such as figure 1 As shown, the applicatio...

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Abstract

The invention provides a method for tunneling construction of a hexagonal section of a roadway.The method is used for solving the problem of insufficient rib spallingcontrol force. The method includesthe steps that a rectangular pilot tunnel istunneledin the middle of an upper step working face, a middle hole formed by thepilot tunnel is taken as a boundary, and arc-shaped rib parts are tunneledon the left and right parts of the upper step face; after construction of the upper step working face is completed, the left and right parts of a lower step working face are tunneledin turn; and aftertunneling of the left and right parts of the lower step working face is completed, a step slope is tunneledforwardsbythe preset length and the preset gradientin the middle of the lower step working face,and construction of the hexagonal section iscompleted.

Description

technical field [0001] The present application relates to the technical field of roadway excavation, and mainly relates to a construction method for tunneling with a hexagonal section of the roadway. Background technique [0002] At present, the quasi-mining roadways of deep high-in-situ stress mines basically follow the cross-section design of shallow-buried deep mine roadways, and adopt rectangular cross-sections. In actual construction, the rectangular roadway is poorly formed due to ground pressure, which is difficult to support and requires a lot of maintenance. Under the action of strong mine pressure, it is easy to cause serious deformation of the roadway, roof caving and slabs, threatening mine safety production. Contents of the invention [0003] The purpose of this application is to provide a tunneling construction method with a hexagonal section of the roadway, which is used to solve the problem that the existing rectangular section is not strong enough to contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/14E21D20/00
CPCE21D9/00E21D9/14E21D20/00
Inventor 李树坤
Owner INNER MONGOLIA YITAI COAL
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