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Controllable mould bag grouting method for reinforcing roadbed in underlying goaf

A goaf, controllable technology, applied in roads, roads, soil protection, etc., can solve the problems of uncontrollable flow of grouting materials, accumulation effect of plugging accidents, difficult rapid accumulation of grout, etc., to reduce dilution effect , Guaranteed coagulation quality, convenient and quick construction

Inactive Publication Date: 2020-01-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has certain defects when using this method to treat hollow-type goafs: (1) When grouting curtains are used to isolate the governance boundary of hollow-type goafs, due to the large space outside the goaf governance boundary, good interconnectivity and injection The uncontrollable flow of slurry materials can easily lead to a large amount of slurry outflow, resulting in high costs and a lot of waste; (2) if conventional grouting materials are used to fill hollow goafs, the slurry is difficult to accumulate quickly. The loss of slurry is large and the stone rate is low, and the treatment cost will be greatly increased
For hollow goafs, the commonly used control method is to put sand and other aggregates in the hole at the same time as conventional grouting, or use special grouting materials such as paste to fill, which means to prevent the loss of grout and reduce the project cost. , but for the method of putting aggregates such as sand and gravel in the orifice, the construction process is more complicated, and it is easy to cause hole plugging accidents and its accumulation effect in the cavity is poor

Method used

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  • Controllable mould bag grouting method for reinforcing roadbed in underlying goaf
  • Controllable mould bag grouting method for reinforcing roadbed in underlying goaf
  • Controllable mould bag grouting method for reinforcing roadbed in underlying goaf

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as image 3 As shown in Fig. 1, the non-collapsed connected cavity-type goaf subgrade reinforcement treatment, according to the on-site determination of the reinforcement design parameters, the first exploration of the goaf, and then on-site distance measurement and laying out, to determine the location of the curtain hole and grouting hole drilling, Drill holes according to the parameters of the design plan, the distance between curtain holes is 2m, and the distance between grouting holes is 6m. The cement mortar is M7.5 cement mortar mixed by a mixing station. The mix ratio of water: sand: cement is 240:1504:260, and the sand is fine The sand and cement are ordinary silicon No. 42.5 cement produced by Linyi Cement Factory, and the water level is tap water; the ratio of water for cement filling slurry: cement: fly ash is 0.8:0.4:0.6, and the fly ash adopts the national first-class standard fly ash. The cement is bulk cement 42.5 silicate cement made by Yizhou Ceme...

Embodiment 2

[0069] A film bag curtain forming device, in which a galvanized pipe 9 is placed in the middle of a mold bag 11, and a plurality of strings 12 are used to bind the film bag 11 on the outside of the galvanized pipe 9, and the side walls of the galvanized pipe 9 are evenly opened There are small holes 10, and the inside of the galvanized pipe 10 is provided with a grouting pipe 3, which can simultaneously take into account the lowering of the film bag 11 and the forming effect of the curtain wall 5 after the mold bag 11 is grouted.

[0070] The key to the controllable grouting technology in Example 1 is: the lowering of the mold bag 11 and the opening of the mold bag 11 by grouting to form the curtain wall 5. Using the above design, the film bag 11 can be accurately lowered to the target position, and then After grouting, it can be fully expanded to form an effective curtain wall 5, so as to achieve the purpose of "reducing the dilution effect of groundwater on the grout, prevent...

Embodiment 3

[0073] A film bag curtain forming device, in which a galvanized pipe 9 is placed in the middle of a mold bag 11, and a plurality of strings 12 are used to bind the film bag 11 on the outside of the galvanized pipe 9, and the side walls of the galvanized pipe 9 are evenly opened There are small holes 10, and the inside of the galvanized pipe 10 is provided with a grouting pipe 3, which can simultaneously take into account the lowering of the film bag 11 and the forming effect of the curtain wall 5 after the mold bag 11 is grouted.

[0074] The key to the controllable grouting technology in Example 1 is: the lowering of the mold bag 11 and the opening of the mold bag 11 by grouting to form the curtain wall 5. Using the above design, the film bag 11 can be accurately lowered to the target position, and then After grouting, it can be fully expanded to form an effective curtain wall 5, so as to achieve the purpose of "reducing the dilution effect of groundwater on the grout, prevent...

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Abstract

The invention relates to a controllable mould bag grouting method for reinforcing a roadbed in an underlying goaf. The method comprises a curtain wall and a grouting body, wherein the grouting body isfilled in the curtain wall; the curtain wall is formed by grouting a mould bag; the mould bag is formed by sewing hemp bags with thick threads; the mould bag has three sides with a width of 1.6m andan overall length of 6m; a galvanized pipe is arranged in the middle of the mould bag; a grouting pipe is arranged in the galvanized pipe; and the grouting pipe and the galvanized pipe are fixed by steel wires. According to the method, the goaf reinforcement grouting technology is controllable, the material consumption and the goaf treatment cost are reduced through the curtain wall, meanwhile, the reinforcement strength of the goaf is convenient to control, the pollution to the surrounding environment is greatly reduced, and the effective reinforcement of the hollow goaf can be realized.

Description

technical field [0001] The invention belongs to the field of roadbed reinforcement engineering, and in particular relates to a technology for treating and reinforcing goafs in roadbeds, in particular to a controllable grouting technology for treating goafs under expressway roadbeds. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The goaf refers to the area or range of ground deformation and damage caused by the displacement, cracking, fragmentation and collapse of the space formed after underground mineral mining and the instability of the surrounding rock, until the overall subsidence and bending of the overlying rock layer. [0004] With the massive mining of coal, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/04E02D3/12
CPCE01C3/04E02D3/12
Inventor 宋修广崔文杰杨鹤张宏博孙朝俊于瀚
Owner SHANDONG UNIV
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