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Steel casing pulling-removal method
The invention relates to a steel casing pulling-removal method which comprises the following steps of (1) adopting impermeable soil for backfilling, and preparing a mud slurry for plugging a formation; (2) full-length welding a capping steel plate at the upper end of a steel casing, and reserving a gas-liquid inlet pipe; (3) installing and moving equipment in: moving lifting equipment in, and installing a rotary motor and a vibration hammer, wherein the vibration hammer is connected with the steel casing; (4) liquifying a soil mass: starting the vibration hammer to liquify the soil mass aroundthe steel casing; (5) pressurizing through a hydraulic system: applying water pressure in the steel casing, slowly lifting the lifting equipment, and starting the rotary motor at the same time; (6) pressurizing through an air pressure system: applying air pressure into the steel casing, and continuously lifting the steel casing; and (7) pressurizing through a hydraulic system: when the steel casing is 3 to 5m away from a pile block, stopping air feeding, releasing pressure, starting the hydraulic system to apply water pressure into the steel casing, and then pulling out of a pile body. By adopting the method, through a gas-liquid pressurization combination method, the difficulty in pulling and removing the steel casing under a special condition in the prior art is saved, and the safety and the stability in the steel casing pulling-removal process are effectively ensured.
一种钢护筒拔除方法，包括以下步骤：1）采用不透水土回填并制备泥浆进行地层封堵；2）在钢护筒上端满焊封顶钢板，并预留气液进管；3）设备安装进场：起吊设备进场并安装旋转电机、振动锤，振动锤连接钢护筒；4）土体液化：启动振动锤对钢护筒周围土体进行液化处理；5）液压系统加压：向钢护筒内施加水压，起吊设备缓慢提起并同时启动旋转电机；6）气压系统加压：向钢护筒内施加气压，钢护筒继续上升；7）液压系统加压：在钢护筒距离桩顶3‑5m时，停止送气并卸压，启动液压系统向钢护筒内施加水压后拔出桩身。采用上述方法，通过气液加压结合的方法，解决现有技术中特殊条件下钢护筒拔除难题，并有效保障钢护筒拔除过程中的安全稳定性。
Steel casing pulling-removal method
The invention relates to a steel casing pulling-removal method which comprises the following steps of (1) adopting impermeable soil for backfilling, and preparing a mud slurry for plugging a formation; (2) full-length welding a capping steel plate at the upper end of a steel casing, and reserving a gas-liquid inlet pipe; (3) installing and moving equipment in: moving lifting equipment in, and installing a rotary motor and a vibration hammer, wherein the vibration hammer is connected with the steel casing; (4) liquifying a soil mass: starting the vibration hammer to liquify the soil mass aroundthe steel casing; (5) pressurizing through a hydraulic system: applying water pressure in the steel casing, slowly lifting the lifting equipment, and starting the rotary motor at the same time; (6) pressurizing through an air pressure system: applying air pressure into the steel casing, and continuously lifting the steel casing; and (7) pressurizing through a hydraulic system: when the steel casing is 3 to 5m away from a pile block, stopping air feeding, releasing pressure, starting the hydraulic system to apply water pressure into the steel casing, and then pulling out of a pile body. By adopting the method, through a gas-liquid pressurization combination method, the difficulty in pulling and removing the steel casing under a special condition in the prior art is saved, and the safety and the stability in the steel casing pulling-removal process are effectively ensured.
一种钢护筒拔除方法，包括以下步骤：1）采用不透水土回填并制备泥浆进行地层封堵；2）在钢护筒上端满焊封顶钢板，并预留气液进管；3）设备安装进场：起吊设备进场并安装旋转电机、振动锤，振动锤连接钢护筒；4）土体液化：启动振动锤对钢护筒周围土体进行液化处理；5）液压系统加压：向钢护筒内施加水压，起吊设备缓慢提起并同时启动旋转电机；6）气压系统加压：向钢护筒内施加气压，钢护筒继续上升；7）液压系统加压：在钢护筒距离桩顶3‑5m时，停止送气并卸压，启动液压系统向钢护筒内施加水压后拔出桩身。采用上述方法，通过气液加压结合的方法，解决现有技术中特殊条件下钢护筒拔除难题，并有效保障钢护筒拔除过程中的安全稳定性。
Steel casing pulling-removal method
一种钢护筒拔除方法
LIU NINGBO (author) / ZHANG CHENGLIN (author) / ZHU HU (author) / ZHANG JUNGUANG (author) / ZHANG SHAOBO (author) / DAI WEI (author) / YAN SONG (author) / CHEN GUOHAI (author) / ZHANG TAOCHEN (author) / ZHANG BO (author)
2020-07-28
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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