600mm*2500mm mechanical diaphragm wall grab 12.5ton

A 500 mm, 12.5-ton mechanical diaphragm wall grab is a heavy-duty, cable-operated trenching tool designed for deep foundation excavation. Originating from German geotechnical engineering designs , this grab relies on deadweight gravitational impact and mechanical wire-rope reeving rather than onboard hydraulics.

Technical Overview & Key Specifications

In a 12.5-tonne / 500 mm configuration, the grab combines a slender 500 mm jaw profile with additional ballast weight.

The high total mass is critical: mechanical grabs depend entirely on potential energy (

) and grab closing mechanical advantage to penetrate dense sands, gravels, and stiff clays.

Specification Parameter

Standard Engineering Range

Wall Thickness (Jaw Width)

500 mm

Total Operating Weight

~12.5 metric tons ()

Grab Body & Ballast

Upper extension body with internal lead/steel ballast blocks

Operating Principle

Two-line mechanical rope system (Holding & Closing ropes)

Wire Rope Diameter

Sheave System

2-sheave or 3-sheave (double/single sheave combination)

Jaw Cutting Edges

High-abrasion resistance steel with interchangeable teeth

Operational Mechanics & Advantages

How the Mechanical diaphragm wall grab  Works

1.

Free-Fall Penetration: The open grab is dropped into the bentonite slurry-filled trench. Its 12.5-ton mass drives the hardened teeth into the virgin soil at the trench bottom.

2.

Mechanical Closing: As the hoist winch tension is applied to the closing rope, the multi-sheave pulley system generates a high mechanical advantage multiplier, forcing the 500 mm jaws shut around the excavated soil.

3.

Hoisting & Discharge: The closed grab is hoisted out of the slurry, swung over the muck pit, and the holding brake releases the lower linkage to dump the soil payload.

Key Design Benefits

High Reliability in Slurry: Lacking onboard hydraulic cylinders, hoses, or electric sensors, mechanical grabs suffer far fewer breakdowns when working continuously immersed in abrasive bentonite slurry.

Modular Configuration: Stein-type grabs feature modular jaw sets. The main body can be fitted with 400 mm, 500 mm, or 600 mm jaws depending on project structural wall thickness requirements.

Guide Body Rigidity: The tall, rectangular guide body ensures verticality during excavation, helping to prevent trench deviation at extreme depths (30m+).

Site & Rig Requirements

Base Crane Capacity: A friction-clutch crawler crane (or dedicated duty-cycle crane) rated for at least 35 to 50 tons is typically required to handle the 12.5t dead weight plus dynamic payload (2–4 tons of soil) and slurry suction friction during hoisting.

Winch Setup: Requires a dual-winch system with free-fall functionality on both holding and closing drums.

Maintenance Focus: greasing of submerged sheave bearings and monitoring of tooth/lip wear are mandatory, as slurry sediment acts as a heavy abrasive.

Tianjin huachang xingye technology co ltd fabricate mechanical  Diaphragm Wall Grabs are the best solution to excavate diaphragm walls in all soil conditions up to a soil hardness of 70 mPA as light chiselling work is possible. The Diaphragm wall grab is available with grab extensions for a total length of 4 to 16 m and also with extra ballast to reach a total weight of up to 35 ton for even the most demanding projects.
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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