0.65m³0.85m³2.0m³ Back Hoe Dipper Dredger

A backhoe dredger is a machine mounted on a ship or barge that is used to dredge the seabed so that large ships can navigate rivers. Backhoe dredgers are just one of the engineering vessels that perform dredging tasks. This type of dredger is similar to the backhoe used on land and can be built by mounting the excavator on a ship or barge. However, backhoe dredgers are generally large because the bucket needs to reach deep river channels.

 

 

 

Due to the anchoring by spud poles and the fixed boom and stick the dredging depth is limited (maximum 25 m).

Some of these type of dredgers are self propelled.

In 1999, the biggest Backhoe dredger in the world was delivered by Shipyard "De Donge"to "Great Lakes Dredge Dock Co". This dredger is equipped with a Liebherr P996 excavator and can dredge with a 13 m bucket till an approx. 17 m. depth. The dredge can however dredge till a maximum depth of 30 m. in case the boom stick configuration is changed. The maximum penetration/ breakout capacity is 170 tons! The weight of the excavator 470 tons!

 

During dredging the pontoon is lifted partly out of the water to create sufficient anchoring. Besides that the dredger is in that case less sensible for waves. The bucket is positioned and excavates the soil by means hydraulic cylinders on the boom and stick(Figure 8. 4).The effective dredging area depends on the swing angle and the forward step per pontoon position, which on his turn depends on the length of the boom and stick. On the mooring side for the barges the swing angle is restricted. Swinging over the other side is mostly restricted 60° Larger angles are less effective (Figure 8. 5). The method is the same as for cable cranes.

 

 

 

 

 

The crane is positioned on the front side of the pontoon on the "turning table', which situated just above water level. This part is a compromise between the required freeboard and the maximum available excavating force. The required reaction forces for excavations are delivered by the spud-poles.The crane on the turning table is mostly from awell-knownbrand Demag Liebherr, O&K Poclain, etc., which can be delivered in modules (Figure 8.1). The boom and stick are constructed more heavy duty than those for land operations. Marine operations results in higher and moredynamic loads duetodeep excavation depths. Bucket sizes vary fromseveral cubic meters to 20 m. The spud are provided with a hoisting system to hoist the spuds from the sea bed as well as to lift the pontoon partly out of the water to increase the transfer of the reaction forces to the soilFigure 8.9 Shovel modules

 

 

 

 

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