What is a dustpan dredge?

Dustpan dredgers are a specialised type suction dredger with a suction head shaped like a dustpan. They are designed for use on rivers where high bed loads and/or suspended solid concentrations of sand and small gravel are present.

What are the two main types of dredges?

There are two main types of hydraulic dredges – hopper dredges and cutter suction dredges.

What are the main types of dredgers?

Below is a list of the most common types of dredgers and how they are unique from one another.

  • Suction Dredger.
  • Cutter Suction Dredgers.
  • Excavator Dredgers.
  • Bucket Ladder Dredgers.
  • Clamshell Dredgers.
  • Remote Dredging (Autonomous Dredgers)
  • Sand Dredger.

How does a dustpan dredge work?

A dustpan dredge operates like a huge vacuum cleaner. A suction head – over 50 feet wide – is lowered to the soft river bottom. High velocity water jets loosen the material which is then drawn up by powerful pumps, shot through a floating pipeline and deposited up to 1,000 feet away.

How many types of dredgers are there?

The dredged material is laden into barges or can directly to the reclamation area. These suction dredgers can be of two types viz. profile or plain suction Dredgers and Cutting Suction Dredgers.

What machines are used for dredging?

Equipment

  • Auger dredgers.
  • Backhoe Dredgers.
  • Barges.
  • Cutter Suction Dredgers.
  • Trailing Suction Hopper Dredgers.

How do I choose a dredger?

Choice of Type of Dredger – Choosing the appropriate dredger is determined by soil conditions, transport options, dredging location, water depths and placement, and economics.

What is the process of dredging?

The dredging process mainly involves carrying out excavation, of either naturally deposited sediments or man-made debris such as rocks, bottom sediments, construction debris, and refuse, and plant or animal matter on the bottom of either shallow seawater or freshwaters.

What is grab dredger?

A grab, or clamshell, dredge lowers, closes, and raises a single bucket by means of flexible cables. In operation the bucket is dropped to the bottom, where it bites because of its weight and the action of the bucket-closing mechanism. A grab dredge can work at virtually unlimited depths.

What is backhoe dredger?

A backhoe dredger is a mechanical excavator or bucket, mounted on a barge that draws material backwards, towards the dredger.

How much does a dredge cost?

Dredging costs can vary greatly—from $5 to $15 per cubic yard for hydraulic dredging (including engineering design and construction of the disposal basin), and from $8 to over $30 per cubic yard for mechanical dredging projects (including disposal).