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Construction method of high-pressure jet-grouted cement soil impervious wall

A technology of high-pressure injection and construction method, applied in sheet pile wall, foundation structure engineering, construction and other directions, can solve the problems of weak resistance to deformation, thin wall thickness, poor reliability, etc., and achieve cost reduction, investment saving and economic benefits. and huge social benefits

Active Publication Date: 2018-06-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Retaining the advantages of pendulum spraying and fixed spraying anti-seepage curtain, and solving the problems of too thin wall thickness, weak deformation resistance and poor reliability at the spraying hole are the main objectives to be solved by the patent solution of the present invention

Method used

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  • Construction method of high-pressure jet-grouted cement soil impervious wall
  • Construction method of high-pressure jet-grouted cement soil impervious wall
  • Construction method of high-pressure jet-grouted cement soil impervious wall

Examples

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Embodiment 1

[0044] A certain project is a deep foundation pit support dewatering project, the excavation depth of the foundation pit is 8m, and the design water-stop curtain is 14m. Within the depth range of the water-stop curtain, it is divided into five layers according to lithological characteristics: cultivated soil, silty clay, silt, silty clay, and clay. The soil layer is generally in a soft-plastic state, and the buried depth of the groundwater table is 2m.

[0045] The main construction parameters are designed as follows: Three-pipe construction technology is adopted, water pressure is 25MPa, flow rate is 100L / min; air pressure is 0.7MPa, flow rate is 2m 3 / min; cement slurry pressure 2MPa, flow rate 120L / min; injection pipe 1 lifting speed 16cm / min; the average rotation speed of the variable speed power head 12r.p.m, the angular speed ratio between the maximum and minimum is 1:10, the speed change should be It conforms to the parabolic law.

[0046] Under the conditions of the ...

Embodiment 2

[0048] For a water conservancy cutoff wall project, the dam body is 12m high, and the dam soil is generally cohesive soil; the dam foundation soil is silty clay, sandy soil, small-grained gravel soil, silty clay, and clay. The soil layer is generally in a hard-plastic state, and the depth of the cut-off wall is designed to be 20m.

[0049] The main construction parameters are designed as follows: Three-pipe construction technology is adopted, water pressure is 30MPa, flow rate is 120L / min; air pressure is 0.7MPa, flow rate is 2m 3 / min; cement slurry pressure 2.5MPa, flow rate 150L / min; injection pipe 1 lifting speed 12cm / min; the average rotation speed of the variable speed power head 10r.p.m, the angular speed ratio between the maximum and the minimum is 1:6, the speed change It should conform to the parabolic law.

[0050] Under the conditions of the above construction parameters, the plane shape of a single wall formed in the foundation soil is 1.6m in length and 0.35m in...

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Abstract

A construction method of a high-pressure jet-grouted cement soil impervious wall comprises the following steps: A, determining a construction path according to the impervious wall, carrying out locating and wiring, and determining the distances of jet holes; B, adopting a drill rig to carry out pre-drilling; C, placing a high-pressure jet-grouting carriage in place, starting a high-pressure waterpump, an air compressor and a cement slurry pump, and starting a variable-angular-velocity rotating-swinging power head and a lifting mechanism; D, carrying out variable-angular-velocity rotating jet-grouting in a 360-degree range or carrying out variable-angular-velocity swinging jet-grouting in a 180-degree range through the variable-angular-velocity rotating-swinging power head, and realizing stepped or stepless variable angular velocity in the angular range; and E, lifting a jet pipe to a design height by the constant-speed driving of the lifting mechanism, and carrying out construction inan order of two-sequence holes to finish the whole construction of the impervious wall or a curtain. The construction method has the advantages that the defects that plate walls jet-grouted in swinging and rotating manners at the parts close to the jet holes are too thin and have weak deformation resistance are thoroughly overcome, the thickness and shape of the formed wall can be precisely regulated in a certain range, and the formed cement solidified body has shape features in the detached figures 4-6.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for a high-pressure spraying cement-soil anti-seepage wall. Background technique [0002] The high-pressure jet grouting method is a very mature technology with a clear reinforcement mechanism and a wide range of applications. Due to the different reinforcement methods, the high-pressure jet grouting method is divided into rotary jet grouting, fixed and pendulous jet grouting; due to the needs of jetting radius, it is further divided into single-pipe method, double-pipe method and triple-pipe method. When the high-pressure jet grouting method adopts the rotary grouting method, the formed rotary grouted piles can be used for foundation reinforcement; when the rotary grouted piles adopt the lap joint method, they can be used for the anti-seepage walls of water conservancy projects and foundation pit support projects. Anti-seepage curtain, this kind of ant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/18E02D15/02
CPCE02D5/187E02D15/02
Inventor 周冲王兆军
Owner SHANDONG UNIV
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