Construction process of vibratory hammer drilling steel pipe piles

Vibratory hammer driving steel piles is based on the principle of vibration sinking. When the vibrating hammer is connected to the power source, the eccentric weight wheel in its body rotates at high speed to generate high-frequency vibration and excitation force. The high-frequency vibration force is transmitted to the steel pipe through the hydraulic clamp, and then acts on the contacting stratum through the steel pipe. The stratum is squeezing, It liquefies under the action of vibration force and produces contact surface. The vibrating hammer clamps the steel pipe along the contact surface and sinks into the ground through hydraulic clamps until the steel pipe sinks to the designed bearing depth.

construction process
Material preparation: Taking into account the convenience and speed of construction and the length of the pulling rod of the crawler crane, the 529mm steel pipe is processed into a 10m section, and then it is transported to the construction site with a scraper.

Set up the pile position: use theodolite to locate, use the rangefinder to control the distance, and use the rubber raft to measure the pipe through the direction rod on the water surface and wait for the steel pipe to be moved away.

Hanging pipes in place: During construction, crawler cranes can be used to move heavy objects to move them in place. Dig a foundation pit on the shore in advance, use the secondary hook of the crane to lift the steel pipe, insert the lower end of the steel pipe into the protective tube, and use the brown rope man to pull it to stabilize and straighten, the secondary hook is separated from the steel pipe, the main hook lifts the vibrating hammer, and uses the bottom of the hammer. The tip of the hydraulic needle-nose pliers clamps the wall of the steel pipe, the crane hoists the vibrating hammer, the hydraulic tongs and the steel pipe are moved to the position of the water pile, ready to be inserted into the sinking pile.

Inserting pile driving: After placing the pile pipe in place, use a wire hammer to correct its verticality in two mutually perpendicular directions, and start vibrating insert driving. In the whole process of interruption, if the deviation is found, it should be corrected in time. The correction method is: during the vibration process of the vibrating hammer, the main hook of the crane does not place the rope and swings the rod or the lifting rod in a small amplitude until it is aligned and then inserted until the upper surface of the tube is sunk to the control elevation.

Pile connection: Weld the next 10m through the above-mentioned material preparation steps, and the butt joint should be flat and smooth. Construct as described above until the construction of a row of piles is completed.

Laying the roadbed of the temporary bridge: After each row of piles is driven, a 10mm thick steel plate is welded to the steel pipe, the length and width are both 610mm, to increase the contact area between the steel pipe and the above-mentioned I55 I-beam. After the roadbed is paved, the crawler crane moves forward and prepares for the next row of piles. In this way, lay a row and lay a row until all the construction access roads and drilling platforms are erected, and the passing ability is verified to be good.

The construction technology of using vibratory hammer to drive steel pipe piles has shown broad application prospects in engineering. The technology can be widely used in water foundation construction, and it also has a wide range of applications in land foundation construction.


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