Method for pulling out deep pile foundation by utilizing full slewing drilling machine

Abstract

The invention provides a method for pulling a deep pile foundation by utilizing a full slewing drilling machine, comprising the following steps: a position for positioning the pile foundation is measured, and the full slewing drilling machine is fixed on the center of a drilled pile; after being well positioned, the full slewing drilling machine is utilized for drilling holes, and a first section of steel sleeve is drilled into the hole; in the process of utilizing the full slewing drilling machine for drilling the steel sleeve into the hole, a high pressure water gun is used for brushing a gap between the pipe wall of the steel sleeve and the pile foundation; after the drill bushing of the first section of steel sleeve is accomplished, the operation of drilling is stopped, a second section of steel sleeve is used for lengthening the first section of steel sleeve by connection, and the drilling of the entire steel sleeve is sequentially accomplished; and the operation of pile extraction is carried out when drilling is carried out to pile bottom. The technical scheme can reduce the frictional resistance in the process of drilling the steel sleeve into the hole, prevents soil bodies and water around pile bodies from flowing into pile bottom gaps after pile extraction, and reduces the influence on the ambient environment.

Description

technical field [0001] The invention relates to a method for removing deep pile foundations in the technical field of construction, in particular to a method for removing deep pile foundations by using a full-rotary drilling rig. Background technique [0002] With the rapid development of urban construction, especially rail transit and residential construction, more and more high-rise residential buildings are being built in the downtown areas of cities. Therefore, there are more and more works to pull out the underground engineering piles left by the original old buildings. Pile foundation extraction refers to the removal of the pile foundation sunk into the ground to ensure the smooth progress of the future project; and it will not have a great impact on the surrounding buildings during and after the pile removal process. The method of existing pile extraction mainly contains: 1, utilize the pile extraction method of vibratory pile sinking and pulling machine, this method...

AI Technical Summary

Problems solved by technology

The method of existing pile extraction mainly contains: 1, utilize the pile extraction method of vibratory pile sinking and pulling machine, this method produces periodic exciting force by hydraulic device and eccentric block, thereby destroys the soil layer around pile; But hydraulic vibration Pile extractors are mostly imported, expensive, high construction costs, high requirements for construction sites and energy

2. Impact hole-forming pile pulling method. This method adopts the technology of hollow hammer impact drilling into the mud retaining wall. The hollow hammer with a diameter larger than the outer diameter of the pipe pile is used to impact drill along the pipe pile. The pipe pile acts as a guide rod and cooperates with the mud. The soil around the pile is washed down to reduce the frictional resistance, and finally the pipe pile is hoisted out by a crane. This method is easy to operate and can take advantage of the impact footage in hard rock and soil layers, but it is not suitable for general soil Layer is used, the process is slow, and the construction period is relatively long

3. Steel casing pile pulling method, using steel casing to bury is the most commonly used pile pulling method at present. This pile pulling method is to bury the steel casing by driving or