Construction method of gas lift bottom cleaning static pressure pipe pile

Abstract

The invention relates to the technical field of pile foundation construction, in particular to a construction method of a gas lift bottom cleaning static pressure pipe pile. According to the construction method, when a first-section pipe pile is pressed to be close to the bearing capacity by using a static pile driver, the pressing of the first-section pipe pile is stopped, a vibration hole cleaning device is inserted into the first-section pipe pile, sand in the first-section pipe pile is blown out of the first-section pipe pile through airflow, when the sand is cleaned to be close to the bottom of the pile , the static pile driver is started again so as to blow holes and press the pile downwards synchronously, and pressing is stopped till the first-section pipe pile is preferably pressed; and air is continuously supplied to blow holes downwards, air supply is stopped when air is blown to exceed the bottom of the pile by about 1 m, a second-section pipe pile is connected, air inflation is performed while the pile is pressed, after the second-section pipe pile is pressed, air is continuously supplied to blow holes downwards, air supply is stopped when air is blown to exceed the bottom of the pile by about 1 m, a third-section pipe pile is connected, and the step of pressing the second-section pipe pile is repeated. The construction method can be quickly implemented in seaside deep dense sand geology, vibration and noise are avoided, air sources are saved, and the pile driving stability is guaranteed.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a method for constructing static pressure pipe piles with air-lift bottom clearing. Background technique [0002] The static pile pressing method is to press the prefabricated pile into the soil by using the total weight of the static pile driver’s own weight and the counterweight of the pile frame as the reaction force, and maintain continuous operation during construction. The pile length can be continuously welded and lengthened to meet the design pile requirements. length and bearing capacity requirements. In some areas, due to the complex geological composition, miscellaneous fill, medium-fine sand, silt-fine sand, silty clay, fine sand, and medium-sand stratification are obvious, and the standard penetration number is high. The construction efficiency in such areas is slow, even if the pile load The strength has exceeded the design requirements, but it...

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Problems solved by technology

[0004] This patented technology mainly relies on the impact of mixed water flow and air flow to realize pile pressing while clearing holes. The consumption of water flow and air flow is relatively large, and if it is constructed in an area close to sea level, the groundwater is seawater, which is highly corrosive, and the impact of water flow will cause damage to the foundation. The large damage will affect the stability of pile sinking, and the vibration and noise during construction will also affect the surrounding residents

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