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Mechanical diaphragm wall grabs
Mechanical grabs
Diaphragm wall grabs
Mechanical diaphragm wall grabs (rope-operated grabs without on-board hydraulics) rely on crane wire ropes and pulley reeving systems to achieve jaw-closing force. Specifications vary based on trench dimensions, crane class, and target soil conditions, but typical technical parameters across standard industry models (e.g., tjdrilling) follow these baselines: Dimensional & Structural Specs
Trench Thickness (Jaw Width): 400 mm to 1,500 mm (Standard sizes: 600, 800, 1000, 1200, and 1500 mm).
Trench Opening Length (Jaw Spread): 2,200 mm 2500mm,2800mm,3200mm,3800mm to 4,200 mm (typically 2,500 mm to 3,200 mm for standard bites).
Overall Base Weight: 8 to 25 metric tons (Can be ballasted with modular body extensions up to 35+ tons for penetrating hard strata).
Overall Height: 6.5 m to 16.0 m (inclusive of Kelly/guide body extensions to maintain verticality in deep cuts).
Bucket Capacity: 1.0 ^3 to 3.5 ^3 depending on jaw length and width.
Operation & Performance Activation System: Mechanical two-rope or four-rope operation (Closing line + Holding/Lifting line).
Jaw Closing Force: Generated via 4-part to 6-part pulley reeving integrated within the body frame (closing force scales with crane line-pull and mechanical advantage).
Jaw Profiles: Rectangular (standard trenching) or Semi-Circular / Round (for corner cuts and stop-end pipe matching).
Max Depth Capability: Unrestricted by hydraulic hose length (commonly operating up to 50 m–80 m based on crane drum capacity).
Max Soil Hardness: Up to ~50–70 MPa (allows for light chiseling and free-fall impact excavation in stiff clays, dense gravels, or weathered rock).
Key Structural Features
Guide Bodies: Exchangeable guide frames/wings fitted to align with specific trench widths.
Chiseling Teeth: Interchangeable, high-wear resistant forged steel teeth or chisel points (e.g., Weld-on or ESC/Pencent types) designed for bentonite slurry operation.
Bearings & Pulleys: Heavy-duty, grease-filled, grease-sealed or oil-bath bearings engineered to prevent slurry ingress during continuous submerged excavation.
1,SPECIFICATION OF 600MM DIAPHRAGM WALL GRAB
MATERIALS:GRAB BODY :q355b , grab jaw cutting edge :nm400, teeth:25rc12
NO |
L（mm） |
L2（mm） |
T（mm） |
T1（mm） |
T2（mm） |
T3（mm） |
PULLEY NUMBER |
kg |
1 |
8000 |
8900 |
600 |
2800 |
560 |
2200 |
4 |
12500 |
size |
L mm |
L1 mm |
T mm |
T1 mm |
T2 mm |
kg |
pulley |
800 |
8700 |
9600 |
800 |
2800 |
2200 |
15500 |
5 |
1000 |
8700 |
9600 |
1000 |
2800 |
2200 |
17000 |
5 |
1200 |
8700 |
9600 |
1200 |
2800 |
2200 |
18500 |
5 |
1500 |
8700 |
9600 |
1200 |
2800 |
2200 |
20000 |
5 |
Tianjin huachang xingye technology co ltd fabricate mechanical diaphragm Wall Grabs The cutting edges of the grab jaws are made of steel 450 and were especially hardened. Easy mounting of the grab jaws for excavation widths 800 /1000 /1200 mm. All the grab teeth as well as all the wire rope pulleys are quickly exchangeable due to their construction as ready to use components
The pulleys are equipped with oil-filled maintenance-free life time bearings.
The material of edge of jaws is NM450
Jaws of angular or round shape are available.
Jaws may be rectangular or round shape. Jaws, ropes, pulleys and different teeth can be quickly replaced on site without any problems. All rope and guide pulleys have adequately dimensioned, maintenance-free bearings filled with grease.
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