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If slurry walls are installed with a grab, a two-jaw slurry wall grab suspended on a duty cycle crawler crane excavates the slurry wall panels. Mechanical grabs are opened and closed via rope, hydraulic grabs via hydraulic cylinders. Hydraulic grabs can additionally be fitted with flexible guiding strips on the grab frame which allow to align the grab within the trench.
(winch synchronisation allows for high grab weight)
(for hydraulic operation)
(with radio remote control)
(mechanical or hydraulic)
1. Excavation using a slurry wall grab with addition of support suspension
2. Installation of the stop-end pipes
3. Insertion of the reinforcement
4. Installation of the concrete applying the tremie method with simultaneous pumping out of the support fluid
A hydraulically driven thrust rod system opens and closes the grab jaws. The grab is hydraulically supplied through hoses from the carrier machine.
A two-rope grab is mechanically actuated through the hoist and closing rope. With multiple reeving over pulleys the closing forces of the grab can be enhanced.
The most common jaw widths are between 0.4 and 1.5 metres. The jaws’ openings range from 2.8 to 3.6 metres.
The grab jaws are exchangeable if the modification of the basic frame allows it. Thus, different trench widths are possible.
In the freshly produced trench precast concrete elements, steel profiles or sealing panels can additionally be inserted. This is called combination method.
After excavation of the slurry wall panel a reinforcement cage is inserted. Then the trench is filled with fresh concrete from the bottom to the top and the support fluid is pumped off.
The guide wall is installed on both wall sides before the excavation starts. It guides the grab, compensates variations of the suspension level and supports and protects the trench from caving in.
Duty cycle crawler cranes from Liebherr excavating slurry walls with mechanical or hydraulic slurry wall grabs.
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Highest precision is required.
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