Large diameter rotary jet grouting pile has been applied in the land foundation treatment of the Third runway project of Hong Kong Airport. In order to meet the requirements and improve the construction technology, Shanghai Strong Foundation has carried out the following innovations on the construction technology of large diameter rotary jet grouting pile:
1,Fully automatic pulping
Cement is purchased from a qualified manufacturer and shipped in bulk cement by water via a qualified bulk cement carrierDJMConstruction area. The cement is directly transported to the storage tanks of the cement mixing ship or the storage tanks of the cement storage ship by the pneumatic conveying method of the transport ship. During the construction, the cement in the storage tank of the cement slurry mixer ship is transported to the cement mixing bucket by the screw conveyor plane and vertical. The mixing bucket has a weighing system, and the seawater and cement are put into the mixing bucket after full mixing. The cement slurry in the slurry storage bucket is sent to the nozzle of the drill bit of the pile machine through the piston pump.
In the process of cement paste batching (cement, seawater), mixing, storage, transportation and spraying, automatic control, automatic monitoring, automatic recording of automatic operation will be adopted.
2,Construction intelligent management system
Piling control is through"Construction intelligent management system" to implement. The system also has monitoring, signal data acquisition, data analysis, summary and backup, construction management and other functions.
3,Large pile diameter
DJMThe maximum diameter of pile is up to2.5Meters, the highest intensity up to1.6MPa, can effectively reduceDJMPile quantity and increase construction speed.
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