High-pressure water jet-assist pilot hole piling
The high-pressure water jet can use the water jet method to assist subsidence in the construction of hard soil layers. The high-pressure water jet guide hole is composed of a high-pressure water pump, a high-pressure water pipe, a steel pipe, and a water jet nozzle. Inject high-pressure water into the body to liquefy the surrounding soil to reduce the resistance during the sinking of the pile, and also play a certain role in lubrication, so that the pile can sink smoothly in the dense soil layer or other soil layers (general water injection The sinking is also combined with vibration, hammering, etc. to assist the sinking) In the reinforced concrete sheet pile, a water injection channel must be reserved in the middle, that is, a hole in the middle that is empty and can be used for water injection. Steel sheet piles are generally taken along the siding to secure the jet piping.
When the steel sheet pile is pressed into the sandy foundation, the penetration resistance can be effectively reduced by using water jet and pressing. The injection nozzles installed near the pile end inject high-pressure water to enhance the interstitial water pressure between soil particles and create a temporary state where soil particles can move easily. At the same time, the high-pressure water gushing to the ground reduces the friction between the pile surface and the soil, and prevents the soil from entering the lock to cause compaction. After the pile has been pressed to the desired depth, retract the spray nozzle and waterjet hose.
