Coal mining adit ending roadway or dead region supporting support and hydraulic support withdrawing method

Abstract

The invention relates to a coal mining adit ending roadway or dead region supporting support and a hydraulic support withdrawing method and discloses a coal mining adit ending roadway supporting support. The support comprises a plurality of hydraulic supports which are arranged in an ending roadway or a dead region for supporting the ending roadway or dead region roofs. The hydraulic supports are close to one side of an ending roadway caving region and are vertically and parallelly arranged on the back goaf coal wall side arranged in the ending roadway or the dead region. A plurality of rows of hydraulic single props are further arranged in the ending roadway and are arranged along the ending roadway vertically and form a withdraw channel with one side coal wall of the ending roadway, which is away from the hydraulic supports, and the tops of the hydraulic single props support the roadway air channel. The invention further discloses a coal mining adit supporting support hydraulic support withdrawing method. By means of the supporting support and the method, recyclable support material hydraulic supports and hydraulic single props are withdrawn, and accordingly, the hydraulic support safety withdrawing is guaranteed, and potential safety hazards of withdrawing of the hydraulic supports are prevented.

Description

technical field [0001] The invention belongs to the field of coal mining, and more specifically, the invention relates to a support bracket for a coal mining tunnel retracted as a roadway or an empty area and a hydraulic support for retracting a coal mining tunnel for a roadway or an empty area. method. Background technique [0002] At the end of the recovery of the comprehensive mechanized coal mining face, there are a large number of hydraulic supports used to support the roof of the retraction roadway or the retraction operation area in the goaf or the goaf. It is a hydraulic power device that supports and automatically shifts to support and manage the roof. It is an indispensable supporting equipment for comprehensive mechanized coal mining. The hydraulic support is mainly used for horizontal planes and gently inclined thick coal seams less than or equal to 20 degrees along the floor. The longwall fully-mechanized mining face with full-height mining with one-time top-co...

AI Technical Summary

Problems solved by technology

[0002] At the end of the recovery of the comprehensive mechanized coal mining face, there are a large number of hydraulic supports used to support the roof of the retraction roadway or the retraction operation area in the goaf or the goaf. It is a hydraulic power device that supports and automatically shifts to support and manage the roof. It is an indispensable supporting equipment for comprehensive mechanized coal mining. The hydraulic support is mainly used for horizontal planes and gently inclined thick coal seams less than or equal to 20 degrees along the floor. The longwall fully-mechanized mining face with full-height mining with one-time top-coal caving is also suitable for the fully-mechanized mining face with horizontal layered top-coal caving in steeply inclined and extra-thick coal seams. The traditional retraction method is caving retraction. This process method is On the side of the coal wall of the harvesting roadway, the method of wooden point columns and wooden stacks is used to support the harvesting roadway to ensure that a safe space between 1.0 and 1.6m is reserved near the coal wall side for pedestrians and Ventilation channel; when the pit wood support is withdrawn, a large area of ​​empty roof suspension pressure and excessive pressure concentration are often generated, which may easily cause a sudden release of pressure and cause the safety hazard of the laid rope net to be cut and laid instantly; the process method wood The main function of the point column is to temporarily support the roof of the empty area, prevent the roof from collapsing due to loss of support, and bury the hydraulic support to be returned, making it difficult to withdraw the subsequent hydraulic support. The existing wooden point column adopts no less than The round logs and wooden point columns support the virtual roof laid by the roof of the air duct in the retracted lane and the net rope in the return area. Recycling; for the empty area after the hydraulic support is removed, staggered point columns are used with wooden piles with appropriate spacing to support the netting steel wire rope, creating a good safe space for the withdrawal of the next hydraulic support, because wood is a kind of For semi-soft and semi-steel support materials, if the point posts are not erected in time, the virtual roof in the return area will not be effectively supported and will collapse quickly; the wooden point posts supporting the rope net in the return area have different hardness and different angles. First, the degree of stress cannot be the same. Therefore, during the retraction process of each working face, there will be different degrees of broken ropes, which will bring major hidden dangers to safety work. When a certain span is reached, large-scale When the virtual roof and the old roof are pressed, the supporting wooden point columns under the net rope will be broken and torn suddenly under the action of the roof stress, the pressure on the roof is released, and the gangue falls down, providing support for the fully mechanized mining hydraulic support in the coal mining tunnel. Retraction work brings serious safety hazards, which in turn brings greater waste of economic materials and mining losses to the mining industry

Images