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A Bucket Wheel Suction Dredger is a highly efficient and versatile stationary dredger designed primarily for continuous excavation of compacted or hard soils, sand, gravel, and clay. It combines the mechanical cutting action of a rotating bucket wheel with the hydraulic transport capabilities of a centrifugal pump.
Bucket Wheel Suction Dredger Specification
|
Slurry capacity |
5000m³/h |
3500m³/h |
3000m³/h |
2200m³/h |
1200m³/h |
800m³/h |
|
Slurry concentration |
15-20% |
15-20% |
15-20% |
15-20% |
15-20% |
15-20% |
|
Length overall (ladder raised) |
39m |
37m |
37m |
36m |
29m |
26m |
|
Breadth |
8.8m |
7.5m |
7.2m |
6.8m |
6m |
5m |
|
Height |
2.75m |
2.2m |
2.0m |
1.8m |
1.5m |
1.26m |
|
Dredging depth |
15m |
15m |
15m |
15m |
12m |
12m |
|
Discharge distance |
1500m |
1500m |
1000m |
1000m |
1000m |
800m |
|
Total power |
1640kW |
1193kW |
1007kW |
806kW |
648kW |
351kW |
|
Hydraulic winch |
120kN |
100kN |
80kN |
60kN |
40kN |
40kN |
|
Power at shaft |
500kW |
250kW |
170kW |
115kW |
65kW |
45kW |
Key Components & Working Principle:
Bucket Wheel Cutter Head
The defining component is a large, rotating wheel mounted on a ladder. The wheel is equipped with multiple buckets (or scoops) around its perimeter. As the wheel rotates, the buckets mechanically cut, break, and collect material from the dredging face.
Suction System
The excavated material falls from the buckets into a chamber inside the cutter head, which is connected to a powerful submersible centrifugal pump located directly behind the wheel. This pump creates a strong vacuum, mixing the material with water to form a slurry.
Discharge System
The slurry is transported through a discharge pipeline, either floating or supported by pontoons, to the disposal area (reclamation site, hopper barge, or designated placement area). Booster pumps on the dredger or along the pipeline may be used for long-distance transport.
Swinging and Positioning System
The dredger is typically held in position by spuds (heavy steel piles). Using winches and anchors, the vessel swings in an arc around the working spud, allowing the bucket wheel to systematically excavate a wide area.
Primary Advantages:
High Production in Hard Materials: Excels in dredging consolidated sands, gravel, stiff clay, and even soft rock, which are challenging for standard suction dredgers.
Continuous Operation: The combined mechanical cutting and hydraulic suction allow for near-continuous, high-volume production.
Accuracy and Cleanliness: Produces a relatively clean cut with less turbidity (suspended sediments) compared to some purely hydraulic methods, making it suitable for environmental projects.
Versatility: Can be configured with different bucket designs and pump sizes to match specific soil conditions.
Common Applications:
Land Reclamation: Major source for filling materials in large-scale coastal development projects.
Aggregate Mining: Extracting sand and gravel for construction industries.
Port and Waterway Maintenance: Deepening harbors, canals, and fairways where tough seabed materials are encountered.
Channel Construction: Cutting new navigation channels through resistant soils.
Mining Operations: Used in some mineral sand mining (e.g., titanium, zircon) and for tailings management.
FAQ
Q: What is a Bucket Wheel Suction Dredger used for?
A: It is used for dredging silt and sediment, sand extraction, port/harbor maintenance, pier clearance, and land reclamation in inland and marine environments.
Q: Where can this dredger operate-river or sea?
A: Both. It is suitable for rivers, lakes, reservoirs, coastal areas, and marine waters, depending on site conditions and configuration.
Q: What materials can it handle?
A: hard soils, sand, gravel, and clay
Q: Why is it a good choice for port and pier clearance?
A: It helps remove sediment buildup efficiently, maintaining design depth and improving navigational safety while reducing downtime for port operations.
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