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Supporting structure for extremely-narrow coal pillar roadway driving along goaf and construction method of supporting structure

A supporting structure and coal pillar technology, applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of no public report on construction methods, loss of bearing capacity focus, roadway space cannot be maintained, etc., to achieve roadway maintenance volume Effects of extremely small, improved coal pillar recovery rate, and reduced roadway section convergence rate

Inactive Publication Date: 2016-07-06
ANHUI PROVINCE COAL SCI RES INST
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] Considering the improvement of resource recovery rate and ease of roadway maintenance, the third type of coal pillars in coal mines, that is, coal pillars with a width of 3-8m, are most commonly used. It is hoped to reduce the width of the coal pillar as much as possible. However, when the width of the coal pillar drops below 3m, the side coal sides of the gob will be crushed under the pressure of the overlying strata and lose their bearing capacity. Without a reliable focus point, the roadway space cannot be maintained, and at this time, the problem of air leakage is derived
So far, there is no public report on the gob-side roadway support structure and its construction method under the condition of leaving a very narrow coal pillar of 1-3m

Method used

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  • Supporting structure for extremely-narrow coal pillar roadway driving along goaf and construction method of supporting structure
  • Supporting structure for extremely-narrow coal pillar roadway driving along goaf and construction method of supporting structure

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Embodiment Construction

[0024] see figure 1 and figure 2 In this embodiment, gob entry with extremely narrow coal pillars refers to leaving 1-3m coal pillars 2 gob entry along the edge of the goaf in the adjacent section when the entryway 1 is excavated.

[0025] In this embodiment, the support structure for the gob-side entry of extremely narrow coal pillars is:

[0026] The roof of the roadway adopts the structural form of anchor beam net support, and the roof anchor cable in the anchor beam net support adopts a combined anchor cable. The channel steel beam 32 refers to the channel steel beam supported on the roadway roof 3 along the roadway excavation direction; For support, anchor cables 31 cooperate with longitudinal ceiling channel steel beams 32 for reinforced support. Wherein the roof anchor rod 33 adopts strong anchor rods such as Φ20×2400mm left-handed rebar, and the row spacing is 800×800mm; the anchor cable 31 is Φ22×7500mm, and the row spacing of the anchor cable 31 is 1100×800mm. T...

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Abstract

The invention discloses a support structure and a construction method for an ultra-narrow coal pillar gob-gob roadway. The support structure for an extremely narrow coal-pillar gob-gob roadway is a structural form in which the roof of the roadway is supported by an anchor beam net; for The solid coal side of the roadway is supported by coal side bolts; on the goaf side of the roadway, steel shed legs and anchors are used for support. The steel shed legs are connected by the upper arched section and the lower straight leg section by clamping cables; The straight leg section is located on the side of the coal pillar, and the top of the arched section extends to the roof of the roadway. The invention can not only improve the resource recovery rate, but also effectively maintain the roadway space, which is beneficial to ventilation and pedestrians.

Description

technical field [0001] The invention relates to a roadway supporting structure and a construction method for gob-side excavation when 1-2m coal pillars are reserved underground in coal mines. Background technique [0002] Gob-side driving in underground coal mines refers to digging a roadway at the junction of the edge of the coal body in this stage and the goaf in the previous stage, leaving reasonable coal pillars so that the roadway is located in the stress reduction area at the edge of the goaf to reduce the pressure on the roadway , a roadway support method to achieve the purpose of easy maintenance. Coal pillars are generally left when digging roadways along the goaf, one is to isolate the goaf, and the other is to support the roof of the roadway. The basic principle of retaining coal pillars for roadway protection is to keep the roadway in the area with low supporting pressure as much as possible, and the second is to reduce the width of coal pillars as much as possi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/22
CPCE21D11/006E21D11/22
Inventor 杨永刚何炳银杨张杰余大军王波王威王庆牛王福海陈康
Owner ANHUI PROVINCE COAL SCI RES INST
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