Dredging grabs are specialized tools used in underwater excavation and material handling, primarily classified based on their structural designs and application scenarios. Here's a detailed breakdown:
Classification of the dredging grab by Structural Design
Consists of two half-shells(clamshell) that close to capture material. They are versatile and can handle a wide range of materials, from fine sand to coarse gravel.
Variants:
Light-duty: For sand, silt, and loose soil.
Heavy-duty: For clay, gravel, and slab soil.
Giant salvage grabs: For removing large rocks and underwater obstructions.
Features multiple jaws (usually three or more) that conform to irregular shapes.
Classification of the dredging grab by Application Scenario
Harbor and Port Construction:
Heavy-duty clamshell grabs and orange peel grabs are commonly used for dredging, material loading, and obstacle removal.
River and Channel Dredging:
Mechanical clamshell grabs and hydraulic grabs are preferred for excavating sand, silt, and soft clay.
Deep-Water Operations:
Steel-wire-operated grabs and large hydraulic grabs are used for deep-sea mining and underwater construction.
Environmental Dredging:
Watertight grabs and grabs with dust covers are used to prevent pollution during sediment removal.
