Vibrating
Vibrated cast-in-place pile
1. The disposable base plate with seal is positioned.
2. The casing is placed on the disposable base plate.
3. The casing is vibrated with a high frequency vibrator.
4. The casing is vibrated to the projected depth.
5. A reinforcement cage is placed in the dry casing.
6. Concrete is poured into the casing.
7. The casing is extracted and the concrete in the casing is compacted by vibration.
8. Finished pile.
For this pile driving method a vibrator brings the piling element into harmonious longitudinal oscillation. This oscillation is transferred from the piling element to the directly adjacent soil. Thus, the friction along the piling element is significantly reduced during the pile driving process. Due to the weight of the vibrator or pushing with the help of the crowd system the piling element can be installed in the ground. The piling elements can also be extracted following the same principle.
When using high-frequency vibrators with variable static moment, noise and vibrations levels are especially low. Subsequently, it is also possible to carry out vibrating work directly next to sensitive buildings. If the vibrator is guided on a leader, crowd forces can be transferred. Vibrators may also work free-hanging on a duty cycle crawler crane.
Examples with slim design or ring vibrators as well as vibratory hammers
Leader guided vibrating
The high-frequency vibrator is guided directly on the leader, which allows precise installation of the piling element.
Sheet pile walls
Steel sheet piles are installed for temporary or permanent supporting and securing measures.
Auxiliary winch
The auxiliary winch of an LRB carrier machine lifts sheet piles into position. These are attached to the vibrator by clamping tongs.
Vibrated cast-in-place pile
A vibratory hammer installs a steel pipe with a disposable base plate in the ground. After concrete has been pumped in through the pipe, it is extracted again through vibration.
Ring vibrator
The ring vibrator allows installation of piles exceeding the leader length. The reinforcement cage can be inserted before concreting and without disconnecting the vibrator.
Swinging leader
The swinging leader hangs on the duty cycle crawler crane via a special traverse. This method is suitable for pile driving work with very large inclinations.
Fixed leader
A special fixed leader is attached to the boom of the duty cycle crawler crane. The vibrator is guided by the leader so transferring crowd forces. This method is suitable for especially long piling elements.
Flushing container
Flushing with water or air reduces the resistance during installation and so increases the performance for pile driving.
Flushing lines
Flushing lines are welded to the lower end of the piling element. A flushing container supplies the lines with the flushing medium.
The new LV 20 vibrator slim design from Liebherr
The new Liebherr vibrator LV 20 achieves a static moment of up to 20 kgm. The maximum centrifugal force amounts to 1160 kN. Thanks to the use of new materials it is subject to low wear. In addition a new cooling system significantly increases its service life.
The video explains the functions of the Liebherr vibrator, type LV 20.
