The following are the construction steps of high-pressure rotary jet grouting pile taking a project as an example: 1. Determination of pile position: According to the construction axis of the design drawing, measurement of pile position. 2, drilling into a hole: in order to prevent drilling deflection, drilling rig installation should be stable, the fuselage should be horizontal, the sky wheel, vertical axis, drilling center should be on a vertical line, the hole position deviation is not more than 50mm. Complete records should be recorded in the process of drilling. After the final hole, plug the hole with a woven bag to prevent sundries from falling into the hole.
The following is an example of a projectHigh pressure rotary jet pileConstruction steps:
1Measurement of pile position: according to the design drawing construction axis, measurement of pile position.
2,Drilling INTO holes: IN order to prevent drilling deflection during drilling, the rig should be installed firmly, the fuselage should be horizontal, the sky wheel, vertical axis and drilling center of the rig should be on a vertical line, and the hole position deviation should not be greater than50mm. Complete records should be recorded in the process of drilling. After the final hole, plug the hole with a woven bag to prevent sundries from falling into the hole.
3,Slurry control: stirring time is not less than90s, from pulping to completion time is not less than4Hours, the orifice slurry after treatmentafterTo recharge, the gravity of the slurry is maintained at1.50.
4And hole forming acceptance: After passing the acceptance of drilling, high sprinkler grouting shall be mainly carried out, and the ground slurry and gas test spraying shall be carried out before the pipe is lowered, and all parameters shall meet the design requirements before the pipe is lowered.
5,Jet GROUTING: WHEN THE nozzle down to the design depth, under the command of technical personnel, into the requirements of the slurry, gas injection1~3minTo make the injection slurry out, according to the predetermined lifting, rotation, from the bottom up injection to the design height, then stop sending slurry and gas, put forward the jet pipe, jet process to make a good record, after the final injection, report to the supervisor for signature acceptance.
Check grouting pressure
6,Fault reinjection: spraying is stopped due to an accident during the spraying process, and the interruption time exceeds1More than hours, when resuming spray, to spray again0.1~0.2meter
7Grouting and backfilling: If the grouting leakage is found in the hole during the spraying process, the lifting shall be stopped and shall be continued until the leakage is stopped. If the grouting leakage is serious, Party A and the supervisor shall be notified in time to take corresponding measures and grouting treatment shall be carried out until saturation. In THE PROCESS OF SPRAYING, IF there is no reverse slurry or the amount of slurry is too little, the pressure of gas and slurry should be checked immediately. If the pressure increases, the high nozzle should be pulled out and corresponding measures should be taken to deal with it. After the injection of each hole, the injection should be timely until the hole surface does not float down.
Drill pipe lifting speed control
8Pipeline flushing and preparation of the next hole: after the grouting is finished, the slurry supply pipeline should be washed clean in time to ensure the smooth pipeline.
Shanghai Qiangqiang Foundation Engineering Co., LTD. 's business covers foundation pit engineering, pile foundation engineering, land and waterFoundation treatment, slope treatment and other engineering fields. around"Excellent technology, reliable process, fast construction" technical requirements, is to provide customers with land, water foundation engineering technical consultation, construction services and other comprehensive solutions of the entity enterprise.Contact Number:400-100-2850
