Vibration-immersed tube crushed stone pile method is a method that uses vibration-immersed tube to form holes, and adds hard particles to the tube, and forms crushed stone pile to treat the foundation by pulling out the tube and vibration densityLarge diameter vibrating immersed tube rubble pile The pile diameter can reach1200mm, pile length can be reached40mThe above.

The quality of vibrating immersed tube gravel pile is controlled by the reinforcement current method (the reinforcement quality is controlled by the jack-up current or the impact current) or the comprehensive index method. The comprehensive index includes:

1,Vibration head working frequency:According to the commonly24.5Hzcontrol;The stable voltage is generally380 V±20V

2,Vibration force:The excitation force is generally used280~345kN, the excitation force is determined according to the field pile making test.

3,Pour in sand and stone at high pressure:The height of the sand is generally1~1.5m.

4,Vibrator compacting current:The compacting current of the vibroflotation device is determined according to the field pile making test, and the operation is strictly in excess of compacting current.

5,Retention time of vibration:Vibrator retention time is generally30~60s, the vibration retention time of the vibrator shall be determined according to the field pile making test.

6,Decannulation rate:The extubation speed is equal to1.2~1.5m/min, the drawing speed is determined according to the field pile making test.

7,The way density is reinforced:In order to strengthen the density of crushed stone pile, the methods of vibration while drawing tube, vibration retention and reverse insertion are mostly adopted. Under the ground1.0~2.0m Due to the weak lateral constraint, it is not conducive to pile formation. At this depth, overload gravel casting method should be adopted, and then the compactness of granular material can be improved by vibration extrusion.

When THE inspection of gravel pile found that there are up and down discontinuity, the amount of gravel per unit depth is insufficient, the plane position of the gravel pile and the strength perpendicular to the composite foundation do not meet the requirements for pile breaking, neck shrinkage, pile driving and other quality problems, should be regarded as quality problems.

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