False roof of filling body with built-in prefabricated metal mesh reinforcement structure and its construction method

Abstract

The invention discloses a false roof of a downward approach filling body with a built-in prefabricated metal mesh reinforcement structure and a construction method thereof. A prefabricated metal mesh is arranged in the false roof of a downward approach filling body, and the prefabricated metal mesh includes a prefabricated vertical net and a prefabricated bottom network. Set the prefabricated bottom net in the downward approach, temporarily fix the prefabricated vertical net in the downward approach, and form a connection between the prefabricated bottom net and the prefabricated vertical net; pass the wall net in the prefabricated vertical net through anchor rods or The hook is temporarily fixed on the two side walls of the downward approach, and the wall nets on the two side walls are connected to each other by the horizontal vertical net, and then the horizontal vertical net is connected by the vertical net; Construction of the retaining wall and filling with slurry. The reinforcement construction in the downward approach is simple, high in efficiency, low in laying requirements, and reduces the safety risk of workers in construction; the prefabricated metal mesh can be industrially produced, with low overall cost, and the cycle efficiency of mining and filling operations in the approach mining is significantly accelerated, improving the efficiency of the approach. Comprehensive production capacity; the integrity of the false roof of the filling body is good, and the roof of the downward mining method has high safety.

Description

technical field [0001] The invention relates to a downward layered approach filling mining technology, in particular to a downward approach filling body false roof with a built-in prefabricated metal mesh reinforcement structure and a construction method thereof. Background technique [0002] With the continuous improvement of mining safety and environmental protection awareness and the increasing emphasis on the recovery rate of mineral resources, the filling and filling mining method has achieved great development and wide application in recent years. For the mining of underground metal / non-metal mines with high grade and high value, but poor rock stability and high original rock stress, the downward layered approach filling mining method is generally used at present. [0003] In this filling mining method, the direct roof of the downward approach mining operation face is an artificial false roof constructed by filling after the upper layered approach mining is completed. ...

AI Technical Summary

Problems solved by technology

[0014] ① In order to realize the connection and binding of all lap joints between the main reinforcement and the main reinforcement, the auxiliary reinforcement and the auxiliary reinforcement, and the main reinforcement and the auxiliary reinforcement, it generally requires many skilled workers to work for a long time in the downward approach (according to the statistical data of general conditions, In an approach with a typical cross-section of 4m×4m and a length of 30-50m, three skilled workers are required, and it takes 3-5 work shifts to complete the reinforcement mesh binding configuration of an approach), and underground workers need long Exposure to the false roof of the filling body for a long time, high safety risks such as being injured by falling pieces of the roof, cutting steel bars / wires, etc.

[0015] ② There are many overlapping joints of the steel mesh that require manual binding. It is difficult to ensure that technical workers can effectively bind all the joints on site, and the quality of on-site construction is difficult to supervise. Once the steel mesh cannot meet the design binding requirements, the lower layer will be affected Overall Safety and Stability of Filling Roof in Access Mining

[0017] ① All overlapping joints of the steel mesh structure need to be manually connected and bound / welded in the downward approach, which results in a long time for the on-site construction of the steel mesh, affects the mining and filling cycle time of the entire approach, and limits the adjacent access. Mining operation is not conducive to improving the mining efficiency of the mining unit and restricts the improvement of the comprehensive production capacity of the stope

[0018] ②After the configuration of the steel mesh structure is completed, the cemented filling slurry may leak into the crushed ore cushion under the bottom mesh, resulting in the crushed ore being cemented, so that it is difficult to expose the hook of the roof hanger when mining in layers below it , the construction efficiency of searching and hanging hanging bars is low

Moreover, due to the difficulty of artificially hanging the hanging bars, once the design requirements cannot be met, it may affect the overall safety and stability of the false roof of the filling body

[0019] ③When the steel mesh structure is configured in the underground route, it is generally necessary to roll steel bars of various types and lengths in the surface workshop first, and then transport them to the underground. Because various types of steel bars are difficult to bend, the steel bars will be pulled from the surface. It is difficult to transport to the underground stope, and the transportation efficiency is low

[0021] ① Bottom reinforcement mesh and hanging reinforcements need to be laid for each downward approach, which consumes a large amount of reinforcement materials, the reinforcement structure is too conservative, and the cost of materials is high

[0022] ②When weaving the reinforced mesh structure at the access site, many skilled workers are required to work in multiple shifts at the access site, and the labor cost is high, which is not conducive to reducing the comprehensive mining cost of the downward approach filling mining method

[0027] It is basically consistent with the disadvantages of the prior art 1, and only overcomes the disadvantage of low construction efficiency caused by searching for the hook of the upper layer hanging bars when hanging the hanging bars in the lower layer approach in the prior art 1

In addition, prior art 2 saves a certain length of hanging bar steel compared with prior art 1, but increases the cost of spacer materials and pre-welding costs at the ends of short vertical bars

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