Grab jaws

Carrier machine

Semi-Kelly guide

Free-fall winches

<p>(winch synchronisation allows for high grab weight)</p>

Hydraulic rotating device

Slurry wall grab

Hose drum

<p>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.</p>

<h3>Production steps of a slurry wall panel made of reinforced concrete</h3>

<p>1. Excavation using a slurry wall grab with addition of support suspension</p><p>2. Installation of the stop-end pipes</p><p>3. Insertion of the reinforcement</p><p>4. Installation of the concrete applying the tremie method with simultaneous pumping out of the support fluid</p>

<h3>Hydraulic slurry wall grab</h3>

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

<h3>Mechanical slurry wall grab</h3>

<p>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.</p>

<h3>Grab dimensions</h3>

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

<h3>Grab jaws</h3>

<p>The grab jaws are exchangeable if the modification of the basic frame allows it. Thus, different trench widths are possible.</p>

<h3>Precast elements</h3>

<p>In the freshly produced trench precast concrete elements, steel profiles or sealing panels can additionally be inserted. This is called combination method.</p>

<h3>Concreting using the two-phase method</h3>

<p>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.</p>

<h3>Guide wall for the slurry wall grab</h3>

<p>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.</p>

<h2>Video: Slurry wall grab</h2>

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

<h2>Machines</h2>

Teaser

Hydroseilbagger

(not set)

Anbauteile

Schlitzwandgreifer

Spezialtiefbau

LBX-Serie

<h3>Duty cycle crawler crane HS 8100</h3>

<p>with slurry wall grab <a href="/en-cy/p/hsg518-5059768" title="HSG518" target="_blank" class="copy-link" data-uid="5059768-hsg518" categoryUniqueNodeId="LWN_1_122310">HSG 5-18</a> in Milan.</p>

<h3>Two duty cycle crwaler cranes HS 8100 in shift operation</h3>

<p>Airport  Barcelona-El Prat:        Linking of the new airport to the suburban railway.</p>

<h3>HS 8100 in slurry wall grab operation in Zurich</h3>

<h3>Foundation work with nine Liebherr duty cycle crawler cranes </h3>

<p>Infrastructure measures at the Suez Canal.</p>

<h2>Job reports</h2>

<h2>Video: Slurry wall grab HSG 5-18</h2>

<h2>Get in touch</h2>

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<p>If you have any further questions, please contact our local sales or service team.</p>

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<h1>Slurry wall grab</h1>

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External content (third-party service)YouTube videos

Slurry wall grabs are used to excavate deep-reaching diaphragm walls used to build water-blocking walls, surrounding tunnels and open cuts or foundations.

Slurry wall grab | Liebherr deep foundation

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