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Diaphragm Wall Grabs and Chisels

LEFFER Diaphragm Wall Grabs and Chisels speed the excavation in any soil condition or on any job site.

As experts in deep foundation equipment, LEFFER offers a broad selection of diaphragm wall grabs for crane excavation of diaphragm walls. To penetrate hard soil, rocks or boulders, a selection of specialized diaphragm wall rock chisels are available. Regardless of the soil conditions, size or depth of the diaphragm wall, noise or vibration limitations on the job site, or vertical accuracy requirements – LEFFER has a solution for fast, efficient and cost effective excavation of diaphragm walls.

LEFFER SeriesGrab TypeApplication
SWK and SWG-K Diaphragm Wall GrabDiaphragm Wall Construction
HSWGHydraulic Diaphragm Wall Grab

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PdDiaphragm Wall Grab (SWG)

LEFFER SWG Series Diaphragm wall grabs speed the construction of diaphragm walls.

The LEFFER SWG Series comprises of 8 frame sizes with mounting kits that enable each grab to be tailored for up to three different standard diaphragm wall widths. The SWG-K Series consists of two frame sizes that are designed for low headroom diaphragm wall excavation projects. Similar to the SWG Series, the SWG-K Series are also available with mounting kits that enable each grab frame to be tailored to one of three diaphragm wall widths. The smallest of the LEFFER SWG/SWG-K Series grabs excavates diaphragm walls as small as 400mm in width, with a bite size of 2.8 meters and jaw capacity of 690 Liters. The largest LEFFER Diaphragm wall grab excavates 1500mm width walls, with a bite size of 3.2 meters and a jaw capacity of 2800 Liters. In addition, some frames offer optional extensions that may be added to the top of the grab to increase the grab weight and verticality accuracy.

LEFFER Diaphragm Wall Grab (SWG/SWG-K Series) – Features and Benefits

FeaturesBenefits
Mounting kits enabling excavation for up to three different wall widths with a single frameFlexibility. Reduced Cost.
On-site, easily replaceable jaws, ropes, and rope pulleyField serviceable. Less downtime.
Angular or round jaw shape optionsTailor grab to site conditions/owner preference
Rope and guide pulleys are adequately sized, maintenance free, and oil-filledDurability. Reduced service and repair.
Multiple deflection pulleys (5-7)Maximizes jaw closing force
Low Profile SWG-K Series are only 4.74 m tallProvides maximum clearance for overhead obstructions

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Hydraulic Diaphragm Wall Grab (HSWG)

LEFFER SWG Series Diaphragm wall grabs speed the construction of diaphragm walls.

LEFFER Hydraulic Diaphragm Wall Grabs trenches up to 50m deep with verticality of 1:800

LEFFER HSWG Series Hydraulic Diaphragm Wall Grabs are the ultimate solution for fast, accurate, and deep excavation of diaphragm walls. Low noise and vibration free performance make them suited for almost all job sites. The HSWG Series incorporate a patented vertical measurement and control system that enables trenches to be excavated with a guaranteed verticality of 1:800. This hydraulic control system allows the operator to tilt the grab in the x and y directions as well as rotate the grab +/- 100⁰ to retain verticality of the trench. This technology allows trenches up to 50m to be accurately excavated, with guaranteed verticality of 1:800 – backed up by measurement data that can be stored or printed out for certification.

The HSWG Series comprises of more than 20 different individual models tailored for specific wall widths. The smallest of the SWG series excavates 400mm width walls with a jaw capacity of 500 Liters. The largest excavates 1500mm width diaphragm walls with a jaw capacity of 3000 Liters.HSWG grabs require 80kW of power and operate at a maximum operating pressure of 320 bar.

FeaturesBenefits
Patented, permanently installed verticality measurement with operator indicationOperator can immediately recognize any deviation from vertical of the trench
Excavation control system enabling hydraulic tilting of the grab in x,ydirections and rotation +/-100⁰Operator can correct any deviation in the vertical position by modifying the direction of the grab.
Superior vertical accuracy of walls 1:800 can be guaranteed
Deeper walls (up to 50m) can be excavated accurately
Store and print trench vertical measurement dataVerifiable documentation of construction results and operator performance
Noise and vibration free operationCan be used on noise/vibration free job sites
2 rope suspensionEconomical - can use a smaller carrier unit

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Hydraulic Diaphragm Wall Grab Operates Free Of Noise And Vibration.