Pile foundation combined grouting reinforcement construction method combining waterproof curtain

Abstract

The invention discloses a pile foundation combined grouting reinforcement construction method combining a waterproof curtain. The method comprises the first step of jet grouting pile drilling construction, the second step of jet grouting pile construction, the third step of jet grouting pile hole separation construction and waterproof curtain forming, the fourth step of pile body grouting and drilling construction, the fifth step of orifice grouting device building, the sixth step of pile foundation reinforced position cleaning and chambering, the seventh step of grouting through a high pressure jet grouting mode, the eighth step of reinforcing steel bar adding in grouting holes and the ninth step of grouting in a static pressure grouting mode. According to the method, the waterproof curtain formed by jet grouting piles and the combined grouting method with a static pressure grouting method and a high pressure jet grouting technology combined in a timing sequence are combined, the respective advantages of the waterproof curtain and a combined grouting technology are achieved fully, the respective defects of the waterproof curtain and the combined grouting technology are overcome to carry out the pile foundation reinforcing construction, therefore, the maximum stratum applicability and the optimal reinforcing effect are achieved, and reinforcing reliability and success rate are guaranteed.

Description

technical field [0001] The invention relates to the field of geotechnical engineering in the discipline of civil engineering architecture, in particular to a pile foundation reinforcement construction method. Background technique [0002] At present, the grouting reinforcement methods mainly used in the pile foundation grouting reinforcement technology at home and abroad include pile foundation static pressure grouting reinforcement technology, pile foundation high-pressure rotary jet grouting reinforcement technology and pile foundation composite grouting reinforcement technology. [0003] 1. Pile foundation static pressure grouting reinforcement technology: using the principle of hydraulic pressure, air pressure or electrochemistry, the grout with strong curing effect is injected into the grouting hole for pile foundation reinforcement through the grouting pipe under the condition of the hole seal. Filling, infiltration, compaction and splitting of grout are used to fill t...

AI Technical Summary

Problems solved by technology

The disadvantages of this technology are: the controllability of the grouting slurry is poor, it is easy to have the phenomenon of stringing or running out of the grout, and the grout is easy to be lost to places other than the reinforcement area.

The disadvantages of this technology are: the diffusion range of the slurry is small, the water-cement ratio of the grouting slurry is large, and the consolidation shrinkage is large

[0011] From the table above and the introduction of each pile foundation grouting reinforcement method and its advantages and disadvantages in the previous chapter, it can be seen that if there are karst caves at the bottom of the pile or dissolved rocks and sediments exceeding the specification requirements or honeycombs and sandwiches in the pile in sandy and other loose strata, The static pressure grouting method is not enough to completely deal with such problems, while the high-pressure jet grouting method and composite grouting method can deal with pile bottom karst caves or dissolved rocks in general formations, sediment exceeding the specification requirements or pile body Honeycomb, mud inclusion and other problems, but in sandy and other loose strata, because the high-pressure jet flow is used in the construction process of the high-pressure rotary jet grouting method and the composite grouting method to cut the rock and soil around the pile strongly, it is easy to break the pile Large holes are cut around the pile body, which will affect the lateral frictional resistance of the rock and soil around the pile body to the pile body, and will cause an increase in the amount of grouting, which will affect the engineering quantity, project progress and reinforcement effect of the reinforcement project.

[0012] Due to its inherent defects, the single grouting technology can no longer meet the engineering needs under various complex conditions; the composite grouting technology uses high-pressure jet cutting for construction, and the periphery of the pile will be cut in sandy and other loose strata. A larger cavity will affect the bearing capacity of the pile foundation

Sandy and other loose strata are a common geological situation, which cannot be effectively solved by conventional grouting methods in pile foundation reinforcement projects.

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