Hydraulic diaphragm wall garb

Product Item : DC-Diaphragm wall
Category： Diaphragm Wall Grab & tools
Width: 500, 600,800,1000mm etc.
Type: Hydraclic and Mechanical
Application: Foundationd diaphragm wall
Color: customized
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Diaphragm Wall Grab – Overview

A diaphragm wall grab is a heavy-duty excavation tool used in the construction of diaphragm walls (also known as slurry walls). These walls serve as deep, reinforced concrete barriers for underground structures, such as basements, tunnels, cut-and-cover metro stations, and retaining walls.

Key Features & Functions

1. High-Efficiency Excavation
- Designed to dig deep trenches (typically 30m–60m, with some models reaching 100m+).
- Works in various soil conditions, including soft clay, sand, gravel, and moderately hard rock.

2. Hydraulic or Mechanical Operation
- Hydraulic grabs (more common today) use hydraulic power for precise control and strong cutting force.
- Mechanical grabs (rope-operated) are simpler but less efficient in hard ground.

3. Slurry Support System
- Excavation is performed under bentonite slurry, which stabilizes the trench walls to prevent collapse.
- After excavation, reinforcing cages are lowered, and concrete is poured via the tremie method.

4. Applications
- Underground metro & railway projects
- Deep basements & high-rise foundations
- Flood protection & seawalls

- Cut-off walls for dams and tunnels

Parameter

Wall Width	mm	600	800	1000	1200	1500
Inclination adjusting		2	2	2	2	2
Hydraulic pressure	Bar	320	320	320	320	320
Closing force	KN	1000	1000	1000	1000	1000
Closing & Opening time	Sec.	8.5	8.5	8.5	8.5	8.5
Max. opening shell width	mm	2800	2800	2800	2800	2800
Capacity	L	850	1200	1500	1900	2300
Weight	Kg	14000	15500	17200	18500	21000
Weight (heavy duty type)	Kg	19000	22000	23000	25000	27000

Advantages of Diaphragm Wall Grab

1, Deep excavation capability (deeper than sheet piles or secant piles).

2, Minimal vibration, making it suitable for urban environments.
3, High verticality control (critical for structural integrity).
4, Can be used in waterlogged or unstable soils.