A kind of grouting reinforcement method for highway foundation or base course and building weak foundation

Abstract

The invention discloses a road foundation or base and building soft foundation grouting reinforcement method. The method comprises the following steps: setting a reinforcement position, and drilling to form a grouting hole; making a grouting pipe with the length being greater than the depth of the grouting hole according to the depth of the grouting hole, and connecting the grouting pipe to a grouting pump; arranging the grouting pipe and starting the grouting pump to make a slurry flow into the grouting pipe, and allowing the slurry to be shunted when the slurry flows to the tail end of the casting pipe in order to make the slurry flow to a flow guiding pipe, and allowing the flow guiding tube to downward slide along a flow guiding slot under the pressure action of the slurry and to outward extend in a cruciform manner in order to make the nested flow guiding tube extend step by step; allowing the slurry to be discharged from slurry outlet holes arranged on the grouting pipe and the flow guiding pipe and to diffuse to a predetermined grouting reinforcement position and range; and stopping grouting, and pulling out the grouting pipe. The method has the advantages of wide diffusion range of the slurry, uniform distribution in the soft foundation, fast slurry discharging speed, good grouting reinforcement effect, and avoiding of secondary grouting.

Description

technical field [0001] The invention relates to engineering construction, in particular to a grouting reinforcement method for highway foundations or base layers and building weak foundations. Background technique [0002] During the use of the road, under the action of the traffic load and the natural environment, the road performance gradually declines, and various damages occur, many of which are related to the instability or insufficient strength of the base or foundation, such as cracks, uneven settlement, and hollowing out. Wait. Improving the strength of the foundation and strengthening the weak foundation are very important to improve the road performance and prolong the service life of the road. The use of trenchless grouting reinforcement technology to repair foundation diseases is convenient and fast, with small engineering volume and low cost, avoiding large filling and large excavation, and has little impact on traffic. It can significantly improve the bearing ...

AI Technical Summary

Problems solved by technology

The slurry spreads to the surroundings by its own fluidity, and it is easy to gather together, the diffusion is uneven, and the filling effect of the gap is poor.

Due to the concentration of grout, it cannot be evenly distributed. Areas with too much grout will easily cause the foundation to rise too high, and areas with too little grout will have insufficient strength.

The accumulation of grout at the port of the grouting pipe will also lead to slow grouting speed and increase the grouting pressure

The overall grouting reinforcement effect of the current grouting method is poor, which cannot meet the actual requirements well, and even requires secondary grouting

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