Method and device for grouting in hole and effectively stopping grout

Abstract

The invention discloses a method for grouting in a hole and effectively stopping the grout. The method is divided into two main action processes, namely grouting and stopping the grount and comprises the following steps: drilling a hole, grouting, expanding with an expansion rubber plug, grouting and disassembling. The device for realizing the method for grouting in the hole and effectively stopping the grout comprises a grout inlet pipe (1), a grout pipeline, an expansion stop-grouting plug (11) and a single-way pressure valve (14) which are sequentially connected, wherein the grout pipeline and the expansion stop=grouting plug (11) as well as the expansion stop-grouting plug (11) and the single-way pressure valve (14) are connected by joints. The technology can stop the grout at any section in the grouted hole with good effect. Besides, steel grout transmission pipes can be conveniently removed from the device, thereby reducing the waste of the materials while ensuring the grout stopping effect.

Description

technical field [0001] The present invention relates to a grout-stopping technology, in particular to a method for grouting and effectively stopping grouting in holes that are applied to tunnels, underground engineering cracks, and broken rock masses for advance grouting reinforcement and water blocking; the present invention also relates to a method for realizing A device for injecting grout into the hole and effectively stopping the grout. Background technique [0002] During tunnel and underground construction in cracks and broken surrounding rock, in order to ensure construction safety and reduce water leakage after the tunnel is completed, grouting is often used at home and abroad to achieve water blocking and reinforcement. The grouting techniques currently applied to rock mass grouting include full-hole one-time grouting, segmented forward grouting, and segmented backward grouting. [0003] Full-hole one-time grouting is to complete the drilling at one time according...

AI Technical Summary

Problems solved by technology

[0003] Full-hole one-time grouting is to complete the drilling at one time according to the design, install the orifice pipe in the borehole, and then directly connect the grouting pipeline and the orifice pipe for grouting, but this method does not affect the reinforcement of the bottom of the borehole. The effect is not good, and it is only suitable for strata with no fractures; the progressive segmental grouting method uses a grout stopper or an orifice pipe flange to stop the grout at the bore hole, and drills a section and injects a section, The method of drilling and injecting alternately by drilling another section and injecting another section requires repeated reinforcement and treatment of the front part of the grouting hole, which is cumbersome and wastes a lot of grout

[0004] Retreating segmental grouting is a grouting method in which the hole is drilled to the design depth at one time, and then retreated from the bottom of the borehole to the hole opening according to a predetermined length. This grouting method mainly includes drill pipe retreating grouting and grouting plug In-hole grouting, etc.; drill pipe retreating grouting mainly uses the grout and the orifice chuck to stop the grout, but it cannot stop the grout in the hole. The drilling rig must be occupied during grouting, and it is easy to cause the drill to be stuck and the drill pipe cannot be pulled out. Phenomenon; while the commonly used grouting method of air expansion or water pressure grout stopper can realize the grout stop in the hole. During grouting, the grout stopper expands and stops the grout by pressing air or water. After a period of grouting, the The air pressure or water pressure of the stop plug is released, and then the next section is injected. The disadvantage of this method is that, because it is not a one-way expansion, the stop plug will return to its original shape after the pressure is released, which will cause the slurry in the hole to flow back to the orifice. Unable to maintain pressure and cause slurry waste

[0005] To sum up, none of the existing grouting processes can effectively achieve grouting to any part of the hole and reliably stop the grouting effect, so it is necessary to adopt a new grouting and grouting technology

Images