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Double-spraying bidirectional cement mixing pile drill and construction method thereof

A technology for cement mixing piles and construction methods, which is applied to drill bits, sheet pile walls, drilling equipment, etc., can solve the problems such as the inability to comprehensively and effectively solve the problems of anti-seepage in different soil layers, and achieves increased soil cutting times and good pile forming effect. , Improve the effect of construction quality

Pending Publication Date: 2020-04-03
TIANJIN PORT ENG INST LTD OF CCCC FIRST HARBOR ENG +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For coastal areas, the upper soil layer is generally soft clay, and the lower part is silt and silt sand stratum. The traditional single form of cement slurry mixing pile, rotary spraying pile or powder spraying mixing pile cannot comprehensively and effectively solve the anti-seepage of different soil layers. question

Method used

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  • Double-spraying bidirectional cement mixing pile drill and construction method thereof

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Effect test

Embodiment 1

[0031] A double-spray two-way cement mixing pile drill bit, comprising: an outer main drill pipe 1, an inner main drill pipe 2, a high-pressure spraying pipe 3, a high-pressure powder spraying pipe 4, a first group of blades 5, a second group of blades 6, a third group of blades Set of blades 7, the main drill pipe is composed of an outer main drill pipe 1 and an inner main drill pipe 2, the outer main drill pipe is coaxially sleeved on the outer layer of the inner main drill pipe 2, and a high-pressure shotcrete pipe is installed inside the inner main drill pipe 2 at the same time. 3 and a high-pressure powder spraying pipe 4, the high-pressure spraying pipe 3 is connected to a computer-controlled high-pressure slurry pump and pulping equipment, and the high-pressure powder spraying pipe 4 is connected to a computer-controlled high-pressure air pump and a cement storage tank, spraying and powder spraying The whole process is controlled by computer, spraying or powder spraying ...

Embodiment 2

[0045]According to the geological survey data of a project, the upper soil layer is 0m-10m of silty clay, 10m-15m of soft soil, and 15m-22m of old clay. The design adopts cement mixing piles for foundation treatment. The diameter of cement mixing piles is 0.5m, the length of the piles is 15m, and the spacing between the piles is 1.0m. Cement slurry spray is used within the depth range of 0m-10m, the cement content is 18%, the water-cement ratio is 0.55, the drilling speed is 1.0m / min, the lifting speed is 0.5m / min, the rotation speed is 40r / min, and the shotcrete pressure during drilling 15MPa. Cement powder spraying is used within the depth range of 10m-15m, the cement content is 18%, the drilling speed is 1.0m / min, the lifting speed is 0.5m / min, the rotation speed is 40r / min, and the cement powder pressure during drilling is 0.6MPa. The depth of 15m-22m is old clay, and its index is relatively good, and it can meet the design requirements without reinforcement.

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Abstract

The invention discloses a double-spraying bidirectional cement mixing pile drill and a construction method thereof. A main drill pipe comprises an outer main drill pipe and an inner main drill pipe; ahigh-pressure grout spraying tube and a high-pressure powder spraying tube are simultaneously arranged in the inner main drill pipe; the high-pressure grout spraying tube is connected with a high-pressure grout pump and grout manufacture equipment, which are controlled through a computer; the high-pressure powder spraying tube is connected with a high-pressure air pump and a cement storage tank,which are controlled through the computer; a first group of vanes and a second group of vanes are arranged on the inner main drill tube; the first group of vanes is positioned below the second groupof vanes; the first group of vanes adopts spiral alloy vanes; the grout spraying hole of the high-pressure grout spraying tube and the powder spraying hole of the high-pressure powder spraying tube are arranged on the lower part of the second group of vanes; and the outer end of the vane above the grout spraying hole is provided with a vertical baffle plate for blocking high-pressure cement grout.A high-pressure cement grout tube and a high-pressure cement powder tube are simultaneously arranged for effectively selecting cement under different states according to different soil layers, and working efficiency is reasonably improved to achieve an optimal foundation processing effect.

Description

technical field [0001] The invention relates to the technical field of soft soil foundation treatment, in particular to a double-spray two-way cement mixing pile drill bit and a construction method thereof. Background technique [0002] The cement mixing method is a method used to reinforce saturated soft clay foundations, so that the soft soil can be hardened into a high-quality foundation with integrity, water stability and certain strength. Cement mixing piles can be divided into wet method and dry method according to the state of cement injection. The wet method is mainly based on cement slurry, which is uniformly stirred and easy to re-mix, and the cement-soil hardening time is long; the dry method is mainly based on cement dry powder, and the cement-soil hardening time is short, but the mixing uniformity is not good, and it is difficult to re-mix the whole process. [0003] Due to different geological causes, the foundation soil is often not a single homogeneous soil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E02D5/46E21B10/42
CPCE02D3/00E02D5/46E21B10/42
Inventor 张瑞棋诸葛爱军陈运涛李立新朱洪满喻志发
Owner TIANJIN PORT ENG INST LTD OF CCCC FIRST HARBOR ENG
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