High-pressure jet grouting pile construction method for road foundation

A technology of high-pressure rotary grouting piles and construction methods, which is applied in the direction of foundation structure engineering, sheet pile walls, soil protection, etc., can solve the problems of poor shape controllability, easy pollution of the environment, poor erosion resistance, etc., and achieve slurry concentration and material Wide, durable effect

Inactive Publication Date: 2021-06-08
CHINA 19TH METALLURGICAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cement consolidated body formed by the existing method has poor shape controllability, low strength, poor corrosion resistance, and is easy to pollute the environment, and the cost is high

Method used

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  • High-pressure jet grouting pile construction method for road foundation

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Embodiment Construction

[0024] The present invention is further described below in conjunction with accompanying drawing and embodiment:

[0025] Technical solution of the present invention is as follows:

[0026] Such as figure 1 Shown, a kind of high-pressure rotary grouting pile construction method of road foundation, comprises the following steps:

[0027] (1) Piling process test shall be carried out before construction.

[0028] (2) Place the drilling rig stably, keep the drill pipe vertical to the ground, its inclination is less than 1.5%, and the deviation between the position of the drilling rig and the design position is less than 50mm.

[0029] (3) After the drilling rig drills the hole to the design depth, insert the grouting pipe, and the overlapping length of the grouting pipe is greater than 100mm.

[0030] (4) When spraying grouting, first start the air compressor with no load, and then start the high-pressure grout with no load after the air compressor runs normally, and then send ...

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Abstract

The invention discloses a high-pressure jet grouting pile construction method for a road foundation. The high-pressure jet grouting pile construction method comprises the following steps that (1), pile forming process test is carried out; (2), a stable drilling machine is placed, and a drilling rod is kept perpendicular to the ground; (3), after the drilling machine drills a drill hole to the designed depth, a grouting pipe is inserted; (4), during jet grouting, an air compressor is started in a no-load manner, high-pressure grout is started in a no-load manner, air and water are supplied into a hole, the grouting pipe is rotated, a grouting pump is started, clear water is supplied into the hole, and a water suction pipe of the grouting pump is moved to a grout storage barrel to start grouting; (5), after jet grouting reaches the designed depth, air supply and water supply are stopped, after cement paste returns out of an orifice, grouting is stopped, clear water is pumped to eject out the cement paste in a slurry pump and a grouting pipeline, and the pump is stopped; (6), after the jet grouting operation, supplementary grouting is carried out on a recess in the top of a consolidated body; and (7), the quality of the consolidated body is checked. According to the method, construction is easy and convenient, the shape of the consolidated body is controllable, the strength of the consolidated body is controllable, durability is good, materials are wide, and the price is relatively low.

Description

technical field [0001] The invention relates to the technical field of road construction, in particular to a construction method of high-pressure rotary grouting piles for road foundations. Background technique [0002] The road foundation reinforcement technology of high-pressure rotary grouting piles is a mature technology developed and widely applied in recent years. In the fields of high-speed railways, highways, high-rise buildings and other fields, it has been regarded as an economical and practical subgrade treatment by the design department as an important technical scheme comparison object. In the prior art, the high-pressure rotary grouting pile uses a high-pressure rotating nozzle to spray cement slurry into the soil layer and mix it with the soil to form a continuously lapped cement body. However, the cement consolidated body formed by the existing method has poor shape controllability, low strength, poor erosion resistance, and is easy to pollute the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D15/04E02D3/12E02D5/46
CPCE02D15/04E02D3/12E02D5/46E02D2250/0023E02D2300/002
Inventor 周继志王劲松李丕俊张光军
Owner CHINA 19TH METALLURGICAL CORP
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