Device for grouting treatment of multi-layer goaf and construction method thereof

Abstract

The invention discloses a device for grouting treatment of a multi-layer goaf and further discloses a construction method. The device comprises a grouting pipe, a first hole sealing device, a groutingpipe head and a second hole sealing device which sequentially communicate, one or more grouting holes communicating with the exterior are distributed in the grouting pipe head, and the maximum outerdiameters of the first hole sealing device and the second hole sealing device are variable. By adopting the device and the construction method, the multi-layer goaf can be subjected to primary hole forming and upgoing-type sectional grouting, the grouting position can be accurately controlled, fixed-point grouting is conducted, the drilling project amount is greatly reduced, the construction period is shortened, the characteristics of easy and convenient operation, low cost, high economic benefits and the like are achieved, the application range is wide, and the device and the construction method are basically suitable for all goaf-type grouting reinforcement projects.

Description

technical field [0001] The present application relates to a construction device, in particular to a device and a construction method for grouting treatment of multi-layer goafs. Background technique [0002] After the development of coal mines, it is easy to leave goafs underground. However, with the acceleration of construction in our country, available land resources are decreasing day by day. Many coal mine goafs are gradually listed as industrial and civil construction sites, resulting in some areas Buildings (structures) such as roads, railways, bridges, tunnel projects, and commercial houses have to be built on the goaf or through the goaf; and the surrounding rock conditions of coal seams are generally very poor, so in such areas The construction technology and methods are extremely demanding during construction. [0003] At present, the ground treatment methods for gobs mainly include grouting method, excavation and backfill method, dynamic compaction method, spanni...

AI Technical Summary

Problems solved by technology

If the multi-layer goaf adopts the process of "segmented hole forming and down-going segmented grouting", it is necessary to use a drilling rig to sweep the hole after the grout in the upper goaf is solidified and drill to the treatment position of the goaf in the next layer. Therefore, there are problems of long construction period and high cost

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