Support method for U-type ventilation primary tunneling setting-up double roadways

Abstract

The invention discloses a support method for U-type ventilation primary tunneling setting-up double roadways. The method includes the steps of tunneling a tunnel face; moving an n-shaped filling and pouring movable formwork (21) forward; installing a sliding device for resisting wall displacement and transformation and a pre-tensioning method prestress anchoring device in the horizontal direction; pouring concrete to form artificial coal pillars; carrying out stepping movement; moving a support; propelling a tunneling machine (33) by following the tunneling tunnel face. The support method for the U-type ventilation primary tunneling setting-up double roadways is easy to implement, safe and reliable and saves cost, after one roadway is excavated, the one-to-two roadway setting-up mode is adopted, which is beneficial for improving ventilation during tunneling, the work of excavating one mining roadway is omitted, a great number of manpower resources are saved, the setup time of the coal face is reduced, continuing tension of excavating work is relieved, section coal pillars are omitted, an artificial built concrete wall structure is adopted to achieve coal-pillar-free mining, the recovery ratio is increased, coal resources are fully explored, and requirements of multiple mining movement influence for fore supporting pressure and post-mining peak pressure are met.

Description

technical field [0001] The present invention relates to a method for setting double lanes in one excavation, in particular to a supporting method for concrete pouring and wall filling of roadways in mining areas such as underground mine mining roadways, upper and lower mountain roadways, etc., as well as a gob-side retaining technology and The method belongs to the technical field of coal mine underground mining. Background technique [0002] The method of retaining entry along the edge of the goaf at the original trough position is called entry entry retention along the goaf. Retention of roadway includes wide coal pillar, narrow coal pillar and no coal pillar mining technology. In order to reduce the loss of coal pillar between the track roadway and the transportation roadway in the coal seam mining area, and improve the recovery rate of coal resources, no coal pillar mining technology can be adopted. That is, during the coal mining process, the coal pillars of the roadwa...

AI Technical Summary

Problems solved by technology

[0003] At present, gobside entry retention includes reinforced concrete support maintenance roadway, filling belt maintenance roadway, intensive support maintenance roadway, pile maintenance roadway, flexible mold filling body, etc., and its essence is to use wooden piles, Masonry gangue belts, concrete filling and other methods are used to keep the roadway and use it as the recovery roadway of the next mining face. However, these traditional gob-side roadway retention technologies have the following disadvantages: ① high cost, poor applicability, complicated process, cutting Poor roofing effect, severe wall slabs, poor stability, and large consumption of pit wood; ② Poor roadway ventilation during mining roadway excavation affects construction continuity, large coal dust inhalation by workers, and difficult discharge of blast holes; ③ Adopt tight The method of filling the concrete wall beside the roadway with the mining face will affect the normal production of the mining face and interfere with each other; ④ manual filling of the pouring concrete wall often requires formwork and formwork removal, which increases the labor intensity of workers, and there is no movable Pouring formwork; ⑤During the coal seam mining, the coal face is affected by the advanced bearing pressure, and the roadway is severely deformed, causing the roadway to be crushed or the filling wall to be severely squeezed and deformed into the goaf or the roadway or even violently Slip phenomenon, the net section of the roadway is reduced, affecting the normal use of the roadway, difficult repair work, and affecting auxiliary transportation and ventilation

[0004] In order to solve the above problems, the main methods of existing reinforcement and masonry filling walls are: using high-grade high-strength cement, improving the material configuration of the filling wall, and adding single hydraulic supports (concrete support, wooden pillars) to the outside of the filling wall. ) and other means, although these means can partially improve the deformation and slippage of the filling wall, but they cannot solve the problem fundamentally, and they all belong to passive support technology methods; in addition, in terms of ventilation, the existing technology still uses traditional local fan ventilation The method, that is, the wind into the air duct and the sewage out of the roadway, cannot solve the ventilation problem. Therefore, how to effectively control and ensure the safety and stability of the filled concrete wall, reduce the deformation of the wall, improve its self-supporting capacity, and solve the problem in essence. Difficult roadway ventilation and other issues are major safety production technical problems that need to be continuously resolved

[0005] In short, the existing gob-side retaining technology is still unreasonable in terms of wall construction and support design ideas and ventilation issues. Most roadway construction either separates gob-side retaining and tunneling and cannot make reasonable use of a transport Belt gangue removal, or the excavation of the pre-mining roadway in the mining face and the post-mining roadway are independent of each other, and the construction of the gob-side roadway and along the trough is not regarded as an overall system project, which cannot be considered comprehensively, resulting in the wall of the gob-side roadway retaining ahead of time. Under the influence of bearing pressure and post-mining peak pressure, the roadway cannot be used normally, so that the effect of retaining the gob-side roadway cannot achieve the expected effect, and even the repair cost is much higher than the cost of driving and leaving coal pillars

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