Method for extracting construction engineering pile foundation

A construction engineering and pile foundation technology, applied in the field of civil engineering construction, can solve the problems of inability to drive in, secondary waste of resources, and difficult construction, and achieve the effects of reducing resistance, saving resources, and protecting the environment

Inactive Publication Date: 2014-01-01
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And then as CN101736746A recommended "the construction method of vibrating sinking tube high-pressure grouting underpinning and pulling out piles" except there are aforementioned deficiencies, owing to needing to inject cement, fly ash and sand filling hole, thereby cause the secondary waste of resources; Pile removal by side-driving profiled steel decompression method, typical literature disclosure such as "drilled cast-in-situ pile reduction and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1:

[0026] A) Preliminary investigation, consult the engineering design drawings and construction materials of the original building from the building archives management department, understand the status of the pile foundation, and more specifically, whether the pile foundation is a pile foundation formed by concrete casting or a pure steel pile foundation, and understand the pile foundation. The length and diameter of the foundation, and the equipment configuration required for pulling the pile is drawn up. In this embodiment, the pile foundation is a steel pile foundation with a circular cross-sectional shape, the diameter of the steel pile foundation is 50 cm, and the length is 5m;

[0027] B) equipment configuration, according to the equipment configuration required for pile pulling proposed in step A), equipped with geological drilling rig, high-pressure jet water pump, air compressor, namely air compressor, jack and hoisting equipment, to obtain a complet...

Example Embodiment

[0034] Example 2:

[0035] Only change the pile foundation in step A) to a concrete casting pile foundation with a diameter of 80cm and a length of 4m and a circular cross-sectional shape; change the distance between the borehole and the pile foundation in step D) to 5㎝, the distance between adjacent holes is changed to 80㎝, the number of holes is equal to 2π × [pillar radius 40㎝ + distance between drilling and pile foundation 5㎝] divided by the distance between adjacent holes That is, the arc length is 80 cm, and the formula is, Take four evenly distributed drill holes by rounding up, change the pressure of high-pressure water to 40MPa, change the pressure of compressed air to 0.8MPa, change the rotation speed of the high-pressure liquid injection pipe to 15rpm, and lift it up ( The speed of lifting) was changed to 0.2m / min; the diameter of the through hole on the slurry discharge pipe in step E) was changed to 0.5cm, and the distance between adjacent through holes was chan...

Example Embodiment

[0036] Example 3:

[0037] Only change the pile foundation in step A) to a steel pile with a diameter of 75cm and a length of 8m with a circular cross-sectional shape; change the distance between the borehole and the pile foundation in step D) to 7.5cm, The distance between adjacent drilling holes is changed to 65 cm, and the number of holes is equal to 2π × [pillar radius 37.5 cm + distance between drilling and pile foundation 7.5 cm] divided by the distance between adjacent drilling holes, that is, the arc length 65cm, the formula is, Take four evenly distributed drill holes by rounding up, change the pressure of high-pressure water to 20MPa, change the pressure of compressed air to 0.75MPa, and change the rotation speed of the high-pressure liquid injection pipe to 20rpm when it is lifted up, and it will be lifted upwards. The speed of (lifting) was changed to 0.225m / min; the diameter of the through hole on the slurry discharge pipe in step E) was changed to 0.75cm, and t...

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Abstract

The invention discloses a method for extracting a construction engineering pile foundation and belongs to a civil engineering construction method. The method includes the steps: learning conditions of the pile foundation and formulating equipment for pile extracting; equipping a geological drilling rig, a high-pressure jet pump, an air compressor, a jack and lifting equipment; leveling terrace and sorting out pile heads, and transporting a complete set of facilities to a site; drilling, namely leading a high-pressure liquid injection tube to the bottom of a hole so as to form a semicolumn slurry-hole body at a position where the pile foundation corresponds to the drill hole; inserting a slurry-discharging tube into the hole body; inserting a slurry-pump slurry-discharging tube into the bottom of the slurry-discharging tube, and pumping slurry out from the slurry-discharging tube; fixing a counterforce device at the top of the pile foundation, jacking the counterforce device through the jack, lifting the pile foundation through the lifting equipment, after the whole pile foundation is extracted, pulling out the high-pressure liquid injection tube and the slurry-discharging tube prior to cleaning the same, detecting the extracted pile foundation, and finally refilling the pile foundation hole. The method is flexible to operate, and favorable for disintegrating binding force of the pile foundation and surrounding soil mass; resistance of the pile foundation when being extracted is enabled to be reduced, so that resources are saved, and an environment is protected.

Description

technical field [0001] The invention belongs to the technical field of civil engineering construction methods, in particular to a method for pulling out construction engineering pile foundations, which is used for removing pile bodies located underground in abandoned buildings. Background technique [0002] In order to enhance the bearing capacity of the foundation to the building, pile foundations are usually set deep into the foundation by piling or reinforced concrete pouring, especially in coastal economically developed areas, where pile foundations are more commonly used. With the rapid development of our country's economy, many buildings in the 1980s and 1990s had to be demolished because they did not meet the requirements of the rapidly developing society. In particular, due to the increasing scarcity of land resources and the increasing awareness of conservation and protection of land resources in the whole society, a large amount of construction land comes from the ...

Claims

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Application Information

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IPC IPC(8): E02D9/02
Inventor 尹立新闫晶李国文张凯
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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