Construction method of walling and filling combined gob-side entry retaining wall body

Abstract

The invention relates to a construction method of a walling and filling combined gob-side entry retaining wall body. The construction method comprises the following steps of: closely following forward propulsion of a stope face, erecting dense single supports at a gob retaining side at the rear part of a fully mechanized mining bracket, so that a space of a tunnel at the rear part of the stope face is retained; walling a square template wall with concrete pier blocks under the mask of the dense single props; meanwhile, installing counter-pulled anchor rods which penetrate through the template wall bodies, and carrying out lateral reinforcing on the template wall bodies; carrying out grouting filling on a hollow part defined by the template walls through injected holes reserved on the template walls till the internal spaces of the template walls are filled with grout; carrying out uniform whitewashing treatment on the wall at one side of a gob retaining tunnel to form a concrete spray layer; and sequentially circulating the steps along with propulsion of the stope face till construction of the whole gob-side entry retaining wall body is finished. According to the construction method disclosed by the invention, a brickwork wall and a filling support are combined together, so that the construction method is simple and convenient and simple to operate and ensures that the wall body has high strength and can yield pressure suitably; and length of each walling of the wall body is consistent with the everyday propulsion degree of the stope face, and the construction method is flexibly suitable for actual mining.

Description

technical field [0001] The invention relates to a construction method of a gob-side entry retaining wall in an underground coal mine, and is especially suitable for a construction method of a masonry-filling combined gob-side entry retaining wall in an underground coal mine. technical field [0002] The invention relates to a construction method of a gob-side entry retaining wall in an underground coal mine, and is especially suitable for a construction method of a masonry-filling combined gob-side entry retaining wall in an underground coal mine. Background technique [0003] Gobside retaining is to keep the mining roadway behind the mined working face along the goaf by supporting pillars, masonry gangue belts or filling concrete as the mining roadway of the next working face. Gobside entry retaining technology is a major reform of coal mining and mining roadway support technology. It can improve the recovery rate of coal resources, reduce the rate of roadway excavation, ...

AI Technical Summary

Problems solved by technology

Among them, the dense support method is seldom used now due to the large workload of installation and withdrawal of dense support, and it is difficult to seal between the supports, resulting in poor isolation effect of the gob. It takes a certain amount of time for the gangue to be compacted, which causes serious air leakage in the goaf, and it is difficult to effectively support the roof in time; although the prefabricated block wall method can form a closed wall to isolate the goaf, it cannot be actively connected to the roof, which is easy to cause The excessive delamination of the roof makes the support effect not good, and the mechanization degree of the prefabricated block wall method is low, and the labor intensity is high; the filling support method and the cast-in-place concrete partition wall method follow the advancement of the working face, Construct the roadside filling wall or concrete wall to form the roadside support belt. This support method has wide adaptability and a high degree of construction mechanization. However, due to the long solidification time of the pouring body, the speed of the wall strength increase cannot meet the mining advance speed requirements. It is difficult to ensure that the wall is closely attached to the roof in time, so it is impossible to effectively control the separation of the direct roof and cut off the direct roof in time, and because the formwork has poor applicability to the change of mining height and the complexity of construction, it cannot meet the requirements of high-yield and high-efficiency working faces

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