Ground strengthened high pressure rotary spraying pile construction technique

A technology for high-pressure rotary jetting piles and construction technology, which is applied in infrastructure engineering, sheet pile walls, buildings, etc., can solve the problems of high equipment loss, long construction period, low construction efficiency, etc., and achieves low equipment loss, low cost, The effect of high construction efficiency

Inactive Publication Date: 2009-05-13
NINGBO DAHUI CONSTR ENG
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses a high-jet pile machine to directly drill down to form a hole, and the drill pipe is sunk by the self-weight of the pile machine, which is only suitable for pile formation where the surface layer is a weak soil layer.
However, in the actual construction process, there are few construction sites that meet this construction condition. The surface layer of mos

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0022] This project is the foundation reinforcement project of Ningbo Steel Plant. The construction site is rectangular, with a length of more than 600 meters and a width of 24 meters. There are two conveyor belt foundations on each side, and the pile position is about 20cm away from the foundation. The total construction period is 90 days; the pile type adopts high-pressure rotary grouting piles, the pile length is 5-14.5 meters, the pile diameter is 800mm, and the spacing is 1.5 meters. Geological conditions, the surface layer is a backfilled pond residue layer of about 2.5-4 meters, which is relatively dense, and the lower layer is a silty clay layer. The design intention is to cement the entire site into blocks, increase the bearing area and improve the bearing capacity.

[0023] Difficulties in construction: The slag layer is high and spray piles are difficult to form holes, and it is difficult to drill down, the construction period is tight, the piles on both sides are c...

Embodiment example 2

[0052]This project is a dock expansion project of Zhejiang Jungang Shipyard. The main pile type adopts high-pressure rotary spraying, with a pile diameter of 1.2m and a pile length of 5-12m. Geological conditions: the water depth is 8 meters, the thickness of the concrete foundation under the water is 2.5 meters, the backfill gravel layer is 1-2 meters, and the bottom is bedrock. The design intention is to cement the gravel layer at the bottom of the concrete through high jetting piles, so as to prevent the layer from penetrating under the strong water pressure of seawater during construction, which will cause construction difficulties.

[0053] Difficulties in construction: the main hole is difficult to penetrate the concrete layer and gravel layer of 2.5 meters.

[0054] In order to solve this difficult problem in the project, we have adopted the drilling rig leading hole technology after research. According to the characteristics of this project, the brief steps and precaut...

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Abstract

The invention discloses a construction technology for a high-pressure rotary churning pile for foundation stabilization, which comprises the following steps: 1. a center point of the high-pressure rotary churning pile is determined; 2. a hole is dug on the center point by adopting a hole digging machine until the hole penetrates a concrete foundation and a pond slag layer; 3. a high-injection drilling machine is arranged in place and adjusted to be stabilized, a drill bit of the high-injection drilling machine is aligned to the center point, and the angle of a drill rod is adjusted to be consistent with the designed pile inclination angle; 4. a high-pressure grouting pump of the high-injection drilling machine is opened, a drilling tool is slowly sunk for drilling a hole after the high-pressure grouting pump of the high-injection drilling machine is normally operated, and simultaneously water is delivered into the grouting hole until the designed elevation is reached; and 5. the prepared chemical serum is poured into a filtering aggregate bin, water delivery is converted into serum delivery by a high-pressure pump, and a serum delivery pump is opened for serum delivery, stands and performs spraying for 20 to 40 seconds at the bottom of the pile, and is rotated and simultaneously lifted until the designed pile top elevation is reached. Compared with the prior art, the construction technology has the advantages of suitability for various different soil qualities with hard surface layers, high construction efficiency, low cost, small equipment loss, and superiority suitable for different construction environments.

Description

technical field [0001] The invention relates to a high-pressure rotary grouting pile construction technology for foundation reinforcement in the field of foundation treatment of construction engineering. Background technique [0002] At present, the traditional high-pressure jet grouting pile construction method used for foundation reinforcement is usually to use a drilling rig to drill a grouting pipe with a nozzle to the design level of the soil layer after determining the center position of the pile, and use high-pressure equipment to make the chemical grout flow at high pressure. The form of flow is ejected from the nozzle and impacts the rotary-cut soil. At the same time, the drill pipe rotates at a certain speed and gradually lifts up at a certain speed, so that the slurry and soil particles are forcibly mixed. After the slurry is solidified, it will be in the soil. form a solid body with a certain strength. This method has the advantages of convenient construction, s...

Claims

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Application Information

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IPC IPC(8): E02D5/46
Inventor 吴哲慧
Owner NINGBO DAHUI CONSTR ENG
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