Drilling-injection compound device and construction technology for grouting reinforcement of water-rich sand layer

Abstract

The invention discloses a drilling and grouting combined device for grouting reinforcement of a water-rich sand stratum and a construction technique. The drilling and grouting combined device for grouting reinforcement of the water-rich sand stratum comprises a grouting pipe body. The grouting pipe body is formed by sequentially connecting a plurality of grouting pipes. The outer side of the pipe wall of each grouting pipe is sleeved with an expandable grout container. A plurality of grout outlets are formed in the portions, matched with the grout containers, of the pipe walls of the grouting pipes. Grout enters the grout containers from the grout outlets of the grouting pipes to make the grout containers expand, and thus the grout containers and the sand stratum around the grout containers are compacted. Integrated operation of drilling and grouting reinforcement in the sand stratum can be achieved through the drilling and grouting combined device. According to the drilling and grouting combined device for grouting reinforcement of the water-rich sand stratum and the construction technique, since the grout containers can contain the grout and can expand, the splitting effect of grout on the sand stratum and linear extension of grout veins during grouting in the prior art are eliminated; and the purpose of reserving the grout around drilled holes is achieved, and the effect of compacting the loose sand stratum around the drilled holes is achieved through expansion of the grout containers.

Description

technical field [0001] The invention belongs to the technical field of tunnels, subways, slope treatment, etc., and in particular relates to a drilling and injection composite device and a construction process for grouting and reinforcing water-rich sand layers. Background technique [0002] As we all know, when underground projects or slope treatment projects encounter sand layers, they will face serious surrounding rock collapse. The reason is that the sand layer is loose and without any cementation, especially the water-rich sand layer has fluidity under the action of water. Once artificially disturbed, the sand layer will lose stability and collapse; construction in the water-rich sand layer, Sometimes it is carried by groundwater, and the sand particles are jetted out like running water. Seriously endanger the safety of engineering and construction personnel. At present, there are technical problems in the grouting reinforcement of the sand layer, especially the water...

AI Technical Summary

Problems solved by technology

At present, there are technical problems in the grouting reinforcement of the sand layer, especially the water-rich sand layer, mainly in the following aspects: First, when the grouting drilling is carried out in the sand layer, it is difficult to Second, when grouting reinforcement in this type of sand layer, due to the non-cementation between the sand grains, the grout will split and migrate outwards without restriction under extremely small pressure, forming a very narrow and far-reaching gap. Infinite + extended linear slurry veins, it is difficult for the slurry to remain around the borehole, it is difficult to strengthen the sand layer around the borehole, and it cannot form an effective self-supporting system with high strength slurry veins, which is controllable for the borehole The grouting reinforcement effect of the whole sand layer is poor

Therefore, during the excavation process after grouting, in addition to the existence of grout veins, it is still difficult to find, and large-scale collapse will still occur

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