Technique for spraying and stirring pile

Abstract

This invention relates to a spraying and stirring pile method, which belongs to civil engineering field, characterized in that the construction depth can reach to 35m, the cement consumption is small (10-20wt% of the earth), the diameter can be fixed (can be 50-100cm), and can penetrate standard penetration value Níœ40 soil layer. The method designs, selects and manufactures the construction equipment as follows: the fixed mount beyond the length of the mount, gunite device, power unit with big twisting moment, the agitator (accompanying diagram2), cut-in screw blade; the method also designs the method of computing the processing parameter, characterized in that it uses the fixed number of leaves, the blade angle, the rotary rate and the water-cement ratio to make sure the cement paste pressure flow and the hoisting speed. The method will be mainly used in the following field: 1, industry and civil architecture foundation process; 2, railway and highway foundation process; 3, harbor, sluice, yard, oil can foundation process.

Description

Technical field: [0001] civil Engineering Background technique: [0002] The current foundation treatment methods to form cement soil are high-pressure jet grouting and deep mixing. [0003] High-pressure jet grouting method: Use high-pressure cement slurry (the jet pressure is often greater than 20mp) to cut the soil, and the jet flow rate is large, which can have a huge impact and agitation on the large diameter pebbles and gravel soil. At present, the treatment depth can reach more than 30m, and the amount of cement is large. However, because the mixing head is not used, the diameters of the cement-soil bodies formed in different soft and hard soil layers are different. [0004] Cement-soil mixing method: using a fixed mixing head, the cement slurry is poured into the soil under low pressure and mixed, and the diameter of the cement-soil is fixed after mixing. However, the diameter of the underground gravel is slightly larger, and the roots of plants are not easy to penetrate....

AI Technical Summary

Problems solved by technology

At present, the construction depth is only 18m, and the quality of the cement soil is not easy to guarantee (many domestic urban construction authorities have written instructions to use it with caution or prohibit it); construction requires at least four stirrings and two sprayings, and the speed is relatively slow

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