Circulating-type layered grouting device

Abstract

The invention discloses a circulating-type layered grouting device for tunnel or roadway grouting reinforcement. The circulating-type layered grouting device comprises an internal grouting pipe and anexternal grouting pipe, wherein the internal grouting pipe is connected with a slurry inlet pipe, and the external grouting pipe is connected with a slurry returning pipe. The slurry inlet pipe is directly connected with a grouting drum and a slurry stirring drum, and the slurry stirring drum is connected with a water inlet pipe; a top stop-grouting plug is arranged at the top of the external grouting pipe, a one-way check valve is arranged in the middle of the external grouting pipe, and a bottom stop-grouting plug is arranged at the bottom of the external grouting pipe; the internal grouting pipe is internally arranged in the external grouting pipe, the internal grouting pipe and the external grouting pipe are perforated pipes, and grouting holes are evenly formed in the grouting pipes.According to the circulating-type layered grouting device for tunnel or roadway grouting reinforcement, circulating grouting can be achieved, and the effect of saving slurry liquid is achieved; layered grouting reinforcement of tunnel or roadway surrounding rock can be achieved, and the effect of rapidly and evenly reinforcing crumbly strata is achieved. The circulating-type layered grouting device for tunnel or roadway grouting reinforcement has the advantages of being easy and convenient to operate, low in cost, high in economic benefit, wide in application range and the like.

Description

technical field [0001] The invention relates to building construction equipment, in particular to a circulating layered grouting device suitable for surrounding rock reinforcement in tunnel or roadway construction. Background technique [0002] During the construction of tunnels or roadways, the surrounding rock stress redistributed due to excavation often causes the surrounding rock within the influence range of excavation to break, undergo large deformation or collapse, and endanger the safety of construction personnel and equipment. In order to ensure construction safety and reduce unnecessary loss of manpower and material resources, grouting method is usually used at home and abroad to reinforce the broken surrounding rock. [0003] After the tunnel or roadway is excavated, the surrounding rock is the porous crack wall surface layer composed of shotcrete from the outside to the inside, that is, the anchor shotcrete support layer; the loose layer filled with gravel behind...

AI Technical Summary

Problems solved by technology

A significant disadvantage of this method is that the slurry will flow back through the fracture channels into the loose rock layer

The grouting resistance is relatively large due to the small crack channel entering the surrounding rock layer; while the space of the bulk layer is relatively large, and the grouting pressure does not rise for a long time due to the existence of the pressure relief channel. After a large number of voids in the loose layer, the grouting pressure begins to rise, but the solidification of the grout injected into the front of the fracture space in the early stage has blocked the fissure channel, and the grout will not be able to diffuse along the fissure channel to the deep part of the surrounding rock. Diffusion in deep rocks is less effective

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