Nail type cement soil stirring pile operation method

Abstract

The operation method of the nail-shaped cement-soil mixing pile is a foundation treatment method, which is suitable for the treatment of soft soil foundation. The construction operation steps are as follows: a. Level the site, and the pile position of the nail-shaped cement-soil mixing pile shall be arranged in plum or square shape; b. Positioning of the mixer: The crane suspends the mixer to the designated pile position and aligns it; c. Mixing and sinking: Start the mixer, make the mixer cut down the soil along the guide frame, and at the same time start the slurry pump to spray cement slurry to the soil, and the mixing blade rotates Stir the cement and soil, and the mixer continues to sink until the design depth; d. Lifting and stirring: the mixer is lifted while continuing to stir the cement and soil to 50cm above the surface or the design elevation; repeat the above steps c and d to complete the construction of the lower pile body; e, Construction of the expansion head: When the mixer is lifted to the surface, first turn off the slurry pump, turn on the expansion switch of the stirring blade, so that the stirring blade is extended to the design length, and then repeat the above steps c and d to complete the upper expansion head part of the construction.

Description

technical field [0001] The invention relates to a ground treatment method, which is suitable for the treatment of soft ground and belongs to the technical field of civil engineering. Background technique [0002] The cement-soil mixing pile was first successfully developed in Sweden. In China, in 1977, the General Institute of Construction Research of the Ministry of Metallurgy and the Water Transport Planning and Design Institute of the Ministry of Communications carried out indoor experiments and mechanical development. In 1980, it succeeded for the first time in the soft soil foundation reinforcement project. Since then, it has been popularized in soft soil foundation reinforcement projects across the country, especially in soft soil foundation treatment in road engineering. [0003] Soft soil foundation treatment in road engineering is a key link to ensure the quality of the project, and it occupies a large proportion of the total project pr...

AI Technical Summary

Problems solved by technology

[0005] (1) It is difficult to coordinate the pile-soil sharing effect, and it is necessary to set a cushion layer or a geotextile reinforcement layer on the top of the pile;

[0006] (2) The pile spacing is small, and the cost is high, which affects the large-scale popularization and application of cement-soil mixing piles;

[0007] (3) The pile spacing is small, which destroys the natural structure of the soil, and the strength of the hard shell soil cannot be fully utilized

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