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Goaf fast grouting system

A technology of grouting system and goaf, which is applied in mining equipment, earthwork drilling, filling, etc., which can solve the problems of long construction period and high cost, and achieve the effect of large pumping capacity, high pump pressure and shortened construction period

Active Publication Date: 2015-09-16
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Only one layer of goaf is distributed within the control area. Before mining, the coal seam is 1.5m thick and the buried depth is 80m. After mining, the height of the caving zone is 8m, and the height of the fracture zone is 15m. rock. In this regard, it was decided to adopt the process of "one-time hole forming and full hole grouting". The specific steps are as follows:

[0053] (1) Construction grouting drilling. It includes three steps: fixed point, installation of drilling rig, and hole formation:

[0054] ① fixed point. Use RTK (real-time dynamic carrier phase difference technology) to stake out on the spot according to the drilling design coordinates, and the error should not exceed 10cm.

[0055] ② Install the drilling rig. According to the position of the lofted hole, the construction platform is leveled, and the down-the-hole hammer drilling rig is in place and installed.

[0056] ③ Hole forming. Use the down-the-hole hammer drilling rig to drill, and use...

Embodiment 2

[0065] There are two layers of gobs distributed within the scope of treatment. The first layer of coal is 1.0m thick and buried 50m deep before mining. After mining, the height of the caving zone is 5m and the height of the fracture zone is 7m. The buried depth is 120m, the height of the caving zone after mining is 8m, and the height of the fissure zone is 15m; the thickness of the Quaternary system here is 10m, and the lower part is all bedrock. In this regard, it was decided to adopt the "one-time hole forming, upward segmental grouting" process, and the specific steps are as follows:

[0066] (1) Construction grouting drilling. It includes three steps: fixed point, installation of drilling rig, and hole formation:

[0067] ① fixed point. Use RTK (real-time dynamic carrier phase difference technology) to stake out on the spot according to the drilling design coordinates, and the error should not exceed 10cm.

[0068] ② Install the drilling rig. According to the position ...

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Abstract

The invention discloses a goaf fast grouting system, which comprises a slurry preparation device, a hole flushing device, a primary grouting device, a secondary grouting device and a slurry level control device, wherein the hole flushing device is communicated with a water pool; a grouting device comprises the primary grouting device and the secondary grouting device; and the slurry level control device is used for controlling the height of the slurry level in the primary grouting process. After the primary grouting device is installed, a steel pipe and a probe of the slurry level control device simultaneously descend to a preset position, and primary grouting is carried out on the steel pipe; when the slurry level reaches the preset position, the grouting is automatically stopped; the primary grouting device is dismounted from a grouting hole; the secondary grouting device is installed; a goaf is subjected to secondary grouting pressurized grouting; the grouting is stopped until the final hole standard is reached; and pure cement slurry is used for sealing a grouting drill hole. The goaf fast grouting system has the advantage that the grouting efficiency is greatly improved on the premise of ensuring the engineering quality.

Description

technical field [0001] The invention relates to the field of goaf grouting, in particular to a fast grouting system for gobs. Background technique [0002] With the acceleration of urbanization and industrialization in our country, and the increase in the density of infrastructure construction such as transportation and road networks, the available land resources are decreasing day by day, and many coal mine goafs are gradually listed as industrial and civil construction sites, resulting in some Buildings (structures) such as roads, railways, bridges, tunnel projects, and commercial houses in the region have to be built on the goaf or through the goaf. [0003] Under the disturbance of surface building (structure) loads and other external forces, it is possible to break the relative equilibrium state of the rock mass in the cracked zone, reactivate the goaf, cause stress redistribution, and cause additional movement and deformation of the surface, which in turn leads to The...

Claims

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Application Information

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IPC IPC(8): E21F15/00
Inventor 郭惟嘉江宁常西坤张保良张士川赵金海王海龙孙熙震路畅王学武王昌祥孔德志孔贺李金平
Owner SHANDONG UNIV OF SCI & TECH
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