Gob-side entry retaining wall construction system and method based on concrete 3D printing technology

Abstract

The invention discloses a gob-side entry retaining wall construction system and method based on a concrete 3D printing technology. The gob-side entry retaining wall construction system and method are suitable for the aspect of entry retaining wall construction in the coal mine gob-side entry retaining technology. The gob-side entry retaining wall construction system comprises a concrete 3D printing system arranged near a working face end entry retaining section and a material preparation system which is not far away from the printing system and located in a retained entry. The concrete 3D printing system mainly comprises a near-end nozzle, a far-end nozzle and a top-contact nozzle; the nozzles can construct a hard wall, a soft wall and a top-contact wall which are arranged in the retained entry trend direction and are correspondingly connected with a hard wall material, a soft wall material and a top-contact foaming material; the near-end nozzle and the far-end nozzle are connected with the bottom of an upper cross beam through sliding rails and can move along the sliding rails; and the top-contact nozzle is located at the end of the upper cross beam. The automation degree is high, the workload of constructors is low, and the operation environment is friendly.

Description

technical field [0001] The invention relates to a system and method for building walls of gob-side entry retaining based on concrete 3D printing technology, and is especially suitable for building and constructing walls of gob-side entry retaining in coal mines. Background technique [0002] Gobside retaining is a relatively important technology in coal mining. Gobside retaining refers to maintaining the original mining roadway behind the current working face along the edge of the goaf. This technology eliminates the section coal pillars and improves the coal The resource recovery rate has been improved to a certain extent in major mining areas. Most of the gob-side retaining technology needs to build an artificial wall along the edge of the goaf, which plays an important role in blocking harmful gases, water, gangue, etc. important role. From the perspective of stress distribution, the artificial wall changes the original rule of the overlying roof, which makes the upper ...

AI Technical Summary

Problems solved by technology

[0003] At present, in actual engineering, gob-side entry retaining has disadvantages such as high work intensity, many end operation machines, concentrated personnel, and poor working environment.

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