Foundation reinforcing method by using pre-added aggregate stirred pile

A technology for foundation reinforcement and mixing piles, applied in sheet pile wall, soil protection, infrastructure engineering and other directions, can solve problems such as hidden dangers of engineering safety, poor pile formation, low pile strength and rigidity, etc., and achieve technical economy. Good, easy to adjust controls, solve technical problems

Active Publication Date: 2010-08-04
赵阳 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its characteristics are similar to those of the mixing pile, but the phenomenon of back slurry is serious in actual operation, resulting in waste and relatively high cost
[0007] The main problem of the above method is that the strength and stiffness of the pile body are too high, which is not coordinated with the deformation of the foundation soil. control, poor formation adaptability

Method used

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  • Foundation reinforcing method by using pre-added aggregate stirred pile
  • Foundation reinforcing method by using pre-added aggregate stirred pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The lithology of the stratum lithology in a station of a passenger dedicated line engineering station to the departure line pre-adding aggregate mixing pile is: miscellaneous fill, brownish yellow, slightly dense, slightly wet. Silty clay, brownish-yellow, flow plastic. Clay, brown-yellow, soft plastic. Silt, brown-gray, dense, slightly wet. Silty silty clay, brown-gray, flow plastic. Silty clay, brownish-gray, flow plastic. Silty clay, brownish gray, hard plastic.

[0025] Due to the strict standards for post-construction settlement of the passenger dedicated line, CFG pile reinforcement, mixing pile reinforcement, and rotary grouting piles were compared when selecting a foundation treatment plan: CFG pile reinforcement has higher stratum adaptability and stronger pile body strength and stiffness. However, compared with the mixing pile, the deformation coordination ability and economy of the ground are poor; the cost of the mixing pile reinforcement is lower becaus...

Embodiment 2

[0029] The landform of a certain line is dominated by coastal plains, and the strata are mainly composed of cohesive soil and silt soil of Quaternary coastal facies and marine-terrestrial interfacial facies. Silty clay: yellowish brown, in soft plastic state, partly in flow plastic state; silty silty clay: gray and silty clay, in flow plastic state; silty clay: grayish yellow, in plastic to hard plastic state.

[0030] The length of the designed pre-added aggregate mixing pile is 12 meters, and the diameter is 0.5m. According to the indoor ratio test, when the strength of the pile body required by the design is reached, the sand content is 20% of the soil weight, and the cement content is 20% of the soil weight. 22%.

[0031] During the construction, the sand pile construction adopts the pile forming equipment and technology of the impact method, the pipe diameter is 200mm, and the sand is fine and medium sand. After the construction of the sand pile, the cement mixing pile ma...

Embodiment 3

[0033] The foundation of a certain project is: silty clay: gray, brown-gray, strong viscosity; silty silty clay, sandwiched with thin layer of silt, silty clay; silty clay, gray, brown-gray, soft plastic ~ flow plastic, smelly .

[0034] The length of the designed pre-added aggregate mixing pile is 15 meters, the diameter is 0.5m, the designed sand content is 18% of the soil weight, and the cement content is 20% of the soil weight.

[0035] During construction, the sand pile construction adopts the hammering pile forming equipment and technology, the pipe diameter is 200mm, the sand is fine and medium sand, the curing agent is No. The unconfined compressive strength of the sky pile body is 5.2MPa.

[0036]Of course, the present invention can pour sand aggregates into the foundation to form sand piles by means of vibration, hammering, impact, static pressure or a combination of several methods in screw conveying. The amount of sand mixed can be added arbitrarily according to ...

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Abstract

The invention discloses a foundation reinforcing method by using pre-added aggregate stirred piles. The foundation reinforcing method is suitable for a weak soil or soft soil foundation. First, sandy aggregate is injected into the foundation through a machine to form sand piles, then the sand piles and the surrounding foundation soil thereof are stirred through blades of the machine and curing agent is added at the same time to enable the foundation soil and the sandy aggregate to be evenly mixed and be coagulated to form pile bodies for reinforcing the foundation. The piles and inter-pile soil jointly form a composite foundation, thereby reaching the goal of reinforcing the soft and weak foundation. Since sandy aggregate is added into the foundation in advance, the mixing proportion of the added sand can be greatly improved and controlled and the strength, the quality and the proper rigidity of the finished piles are ensured. The foundation reinforcing method is a foundation handling method which has the advantages of low cost, high reliability, easy adjustment and control, high adaptability and good technical economy.

Description

technical field [0001] The invention relates to a foundation reinforcement method for building buildings, roads, fields and other similar structures, especially a foundation reinforcement method for pre-added aggregate mixing piles for soft soil or soft soil foundation reinforcement. Background technique [0002] When building buildings or filling embankments or sites on soft soil or soft soil foundation, it is often necessary to do foundation reinforcement. It is a common method to form a composite foundation by semi-rigid piles and soil between piles. Typical of these methods are the following: [0003] (1) CFG pile reinforcement, the method is to mechanically form holes in the foundation, and then add cement, fly ash and crushed stone mixture into the holes, and solidify to form piles, so as to realize foundation reinforcement. This method has strong stratum adaptability. Compared with concrete pouring piles, due to the addition of less cement and the use of fly ash mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/08E02D5/46E02D7/00E02D7/18E02D7/20E02D7/22E02D7/26
Inventor 徐玉杰徐常晟武永新武振亚陈宜祁鹏宇
Owner 赵阳
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