Supporting Structure and Supporting Method for Cut Eye in Coal Mining Face

Abstract

The invention relates to support of fully-mechanized coal mining faces, in particular to a coalface cutting hole supporting structure and a supporting method thereof. The coalface cutting hole supporting structure comprises shed legs, shed beams, straight beams and support columns. The coalface cutting hole supporting structure is characterized in that each shed leg is composed of a straight section and a bent arc section, the shed legs include the left shed leg, the removable shed leg and the right shed leg; the shed beams are composed of straight sections and bent arc sections and include the left shed beam, the removable shed beam and the right shed beam; the straight beams include the left straight beam and the right straight beam; the left shed leg and the left shed beam as well as the right shed leg and the right shed beam are overlapped through the arc sections; the straight section of the left shed beam is overlapped with one end of the left straight beam, the other end of the left straight beam is overlapped with one end of the right straight beam, the other end of the right straight beam is overlapped with the straight section of the right shed beam, and the support columns are arranged below the left straight beam and the right straight beam; the left shed leg, the left shed beam, the left straight beam, the right straight beam, the right shed beam and the right shed leg constitute a double-center flattop arch support structure. The coalface cutting hole supporting structure has the advantages of cutting-hole excavation, one-off construction of an expansion surface, simplified support links, high safety coefficient, higher work efficiency and lower support cost.

Description

technical field [0001] The invention relates to the support of fully-mechanized mining working faces in coal mines, in particular to a support structure and a supporting method for a cut hole in a coal mining working face. technical background [0002] At present, the comprehensive mechanized mining technology has been widely promoted and applied, and the installation preparation of the cutting eye in the fully mechanized mining face is an important part of the mining face, and it is also the focus of safety management. Existing methods are (see figure 1 , figure 2 ): After transporting downwind on the excavation face, use the metal arch support 11 to excavate the cutting hole according to the normal construction method. The slab 12 has a length of 3.8 meters and is supplemented in the form of one beam and three columns between the arched support shed beams. After the completion of the full cut hole and supplementary large slab 12, the surface expansion operation is carr...

AI Technical Summary

Problems solved by technology

[0004] ① The link is complicated, and after the one-time excavation, it is necessary to add large slabs and expand the surface;

[0005] ②The safety factor is low, the cutting hole of the working face has already been damaged and moved during the first excavation, and the blasting operation is continued during the face expansion, which may easily cause the roof to break and cause roof fall accidents;

[0006] ③The work efficiency is low and the construction period is long. Based on the calculation of the length of the 80-meter-cut hole, it takes about 25-30 days for excavation, supplementation, and expansion. The time is exaggerated and it is easy to cause damage and deformation of the slab. In this case, Need to strengthen the support again;

[0007] ④Supporting costs are high, and 3.6m or 3.8m square timber is required for support in face cutting, supplementary expansion, and after it is put into use, it cannot be recycled. Only square timber input requires 120m 3 , cost more than 100,000 yuan

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