A construction method of long spiral soil extraction and back-mixing cement-soil composite pile

Abstract

The invention discloses a construction method of long spiral soil fetching and back-mixing cement soil composite pile. A long spiral drill rod is adopted for construction. The long spiral drill rod comprises a long spiral core pipe. A spiral blade is arranged on the periphery of the core pipe, and notches are formed in the outer edge of the spiral blade. Double-core pipelines are arranged in the core pipe, one pipeline is used for injecting cement paste or mortar or fiber mortar, and the other pipeline is used for conveying compressed air. The drill rod rotates forwards to carry out drilling,soil is located in the spiral blade, in the rotary-lifting process of the blade, part of the soil on an upper blade body falls into the portion, below the upper blade body, of the spiral blade, and asoil layer is replaced up and down. The drill rod rotates reversely to be lifted, and part of the soil is replaced up and down again through the notches. When the drill rod is pressed reversely to belifted, part of the fetched soil and the pumped cement paste or mortar or fiber mortar are reversely pressed and stirred to enter the soil layer; and reverse rotation is carried out again according tothe stratum condition for up-and-down replacement stirring. Construction is convenient, the pile forming quality is good, the application stratum range is wide, and the problem that a conventional stirring pile cannot achieve stirring pile forming is solved.

Description

technical field [0001] The invention relates to a construction method of a long-spiral soil-taking and back-mixing cement-soil composite pile. Background technique [0002] The existing cement-soil mixing pile construction method encounters dense formations, thick sand layers, and pebbles and gravel layers. The drill is often stuck, buried, unable to drill, labor-intensive and time-consuming, the hole-forming speed is slow, and the pile-forming quality is not ideal. Contents of the invention [0003] The object of the present invention is to provide a construction method of a long auger bored pile which can replace the soil layer. [0004] Technical solution of the present invention is: [0005] A construction method for a long helical soil extraction and backmixing cement-soil composite pile, which uses a long auger drill pipe for construction, and is characterized in that: the long auger drill pipe includes a long helical core pipe, and the outer periphery of the core p...

AI Technical Summary

Problems solved by technology

[0002] The existing cement-soil mixing pile construction method encounters dense stratum, thick sand layer, and pebble layer. The drill is often stuck, buried, unable to drill, labor-intensive and time-consuming, the hole-forming speed is slow, and the pile-forming quality is not ideal

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