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Cloth bag grouting pile-forming method

A bagging and grouting technology, which is applied to sheet pile walls, buildings, and foundation structure engineering, can solve the problems of difficult penetration of hard layers and limited reinforcement depth, and achieve the effects of controlling investment, high strength, and solving settlement stability problems

Active Publication Date: 2008-02-20
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the soft and hard soil layers are interbedded, other conventional foundation reinforcement methods have technical defects that the reinforcement depth is limited and the hard layer is difficult to penetrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: Refer to Fig. 1, Fig. 1 shows the formation process of deep-buried cloth bag piles in interbedded soft soil.

[0028] The method of the present embodiment comprises the following steps:

[0029] 1) Form the pile hole 5 in the soil layer with a hole-forming machine. The hole-forming machine adopts ordinary geological drilling rig, rotary drilling rig or vibrating pipe sinking machine, and wall protection mud can be properly configured according to needs. When using a drilling rig to form a hole, the diameter of the hole is ≥ 91mm, and the clear water circulation is generally used during drilling. For the stratum that is prone to collapse, mud circulation is used instead. When the vibrating pipe sinking machine is used to form the hole, the hole diameter is generally greater than 100mm, so as to ensure that the bagged grouting pipe can be placed through the sinking pipe; when constructing super long piles, the collar type sinking pipe construction can be us...

Embodiment 2

[0033] Embodiment 2: Refer to Fig. 2, which shows the formation process of shallow buried cloth bag piles in homogeneous soft soil.

[0034] The method of this embodiment is basically the same as that of Embodiment 1, the difference is that in the step 2, the grouting pipe is composed of a grouting pipe body 21, a guide pipe 22 and a grouting gun head, and in the guide pipe 22 pipe walls are provided with grouting holes along the axial section. The grouting gun head includes a short pipe 10 whose outer diameter is smaller than the inner diameter of the guide pipe 22. The short pipe 10 is inserted into the guide pipe 22. The pipe wall of the pipe 10 is provided with a gun head grouting hole 11, and the short pipe wall on both sides of the gun head grouting hole 11 is provided with a grout stop piston 12 that seals between the guide pipe 22 and the short pipe 10, The lower end of the short pipe 10 is closed, and the upper end is connected with the grouting pipe body 21 . Put th...

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Abstract

The invention relates to a method to construct the pile by injecting grout through a bag, which is characterized in that the method comprises the procedures: 1) a pile hole is formed in the soil with a hole-making machine; 2) a bag is sleeved outside a grout injection tube and the bag is bound on the grout injection tube with a strip segment by segment along the axial direction, the two ends of the bag is tightly bundled, the lower end of the grout injection tube is sealed and the grout injection tube is provided with an injection hole on the tube wall; 3) the grout injection tube which is sleeved with the bag is placed into the pile hole; 4) the grout injection tube is used for injecting grout into the bag section by section from the bottom to the top, the next section is injected until the design pressure of the present section is reached until the whole bag is filled with grout and a whole pile body is formed. The invention adopts the bag pile to enhance the soft underlying soil, which can commendably control the investment and solve the problem of sedimentation and stability. As the bag has the separation effect, the grout can facilitate the surrounding soil to compact and expel the water by expanding the bag; the formed pile body is relatively regular and the intensity of the pile body is higher and controllable.

Description

Technical field: [0001] The invention relates to foundation treatment in the field of construction, in particular to a cloth bag grouting pile forming method suitable for soft soil foundation reinforcement. Background technique [0002] There are many technical solutions and pile types for foundation treatment, such as mixing piles and CFG piles, which require a high drilling frame and a relatively wide site. When the soft and hard soil layers are interbedded, other conventional foundation reinforcement methods have technical defects that the reinforcement depth is limited and the hard layers are difficult to penetrate. Contents of the invention [0003] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology, and propose a bag-grouting piling method and a special grouting pipe that can well control the investment and solve the problem of settlement stability. [0004] In order to achieve the above object, the present...

Claims

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Application Information

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IPC IPC(8): E02D5/34E02D5/62
Inventor 李小和顾湘生赵新益陈仕奇叶春林秦立新周宏元孙宏林乔正寿黄志才蒋和平葛先飞姜鹰黄三强廖进星袁森王卫国罗和平
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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