Controllable mould bag grouting method for reinforcing roadbed in underlying goaf

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...

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

Images