Slurry wall installation with grab

Slurry wall with grab

Slurry wall with grab

Production steps of a slurry wall panel made of reinforced concrete:
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

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.

Examples with slurry wall grabs

  • 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.

    Mechanical slurry wall grab

    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.

  • A hydraulically driven thrust rod system opens and closes the grab jaws. The grab is hydraulically supplied through hoses from the carrier machine.

    Hydraulic slurry wall grab

    A hydraulically driven thrust rod system opens and closes the grab jaws. The grab is hydraulically supplied through hoses from the carrier machine.

  • The most common jaw widths are between 0.4 and 1.5 metres. The jaws’ openings range from 2.8 to 3.6 metres.

    Grab dimensions

    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.

    Grab jaws

    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.

    Precast elements

    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.

    Concreting using the two-phase 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.

    Guide wall for the slurry wall grab

    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.

Video slurry wall grab

Duty cycle crawler cranes from Liebherr excavating slurry walls with mechanical or hydraulic slurry wall grabs.

Duty cycle crawler cranes from Liebherr excavating slurry walls with mechanical or hydraulic slurry wall grabs. Play video

Duty cycle crawler cranes from Liebherr excavating slurry walls with mechanical or hydraulic slurry wall grabs.

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