Dredging equipment ppt in advanced construction technology

Dredging equipment ppt

DOWNLOAD LINK;

Hello friend thanks for coming to our website. In this website you got different types of ppt, excel sheet, recent advancement, latest updated topic, different topic related to civil engineering with full details and etc. Different subjects ppt like hydrology, structure, concrete, highway engineering, building services, maintenance, transportation, wastewater engineering, water resource engineering, building material,  estimation and costing of building, design of steel structure, design of reinforced cement concrete, geology engineering, advanced construction technology, railway engineering, harbour engineering, irrigation engineering, road design, traffic engineering, sanitary engineering and etc.
Different subject excel sheet-like structure, design of steel structure, design of reinforced cement concrete, transportation, estimation and costing of building and etc.
 In this website you got Latest advancement related to civil engineering, the latest updated topic full details, new seminar topic full details .

Different  subject topic  like hydrology, structure, concrete, highway engineering, building services, maintenance, transportation, wastewater engineering, water resource engineering, building material,  estimation and costing of building, design of steel structure, design of reinforced cement concrete, geology engineering, advanced construction technology, railway engineering, harbor engineering, irrigation engineering, road design, traffic engineering, sanitary engineering and etc.  Full details and latest updated details is provide in this website. 

INTRODUCTION

dredging  equipment


         dredging is the  removal of bottom sediments  from SMEARS, rivers , lakes , coastal water and OCEANS .


Types of Dredging equipment

1.Bucket ladder Dredgers
2.Grab Dredgers
3.Dipper Dredgers

Bucket  ladder dredgers

It consists of an endless chain of buckets, mounted and running  round a leader , formed in the middle of the bow of a  floating vessel.  The ladder can be lowered or raised by the line .the bucket is provided with a pronged cutting edge . The chain of buckets is operated by a big wheel. the dug material is brought up as the chain move round and can be dumped in the hopper of the dredger herself. This can also be transferred to the barges alongside by means of a chute. The dredger is suitable for soft ground , sand , gravel hard clay . they are used where depth is not large .


Grab dredgers :-

grab dredger picks up seabed material with a clamshell bucket, which hangs from an onboard crane or a crane barge, or is carried by a hydraulic arm, or is mounted like on a dragline. This technique is often used in excavation of bay mud. Most of these dredges are crane barges with spuds, steel piles that can be lowered and raised to position the dredge.

Dipper Dredgers :-

A backhoe/dipper dredger has a backhoe like on some excavators. A crude but usable backhoe dredger can be made by mounting a land-type backhoe excavator on a pontoon. The six largest backhoe dredgers in the world are currently the Vitruvius, the Mimar Sinan, Postnik Yakovlev (Jan De Nul), the Samson (DEME), the Simson and the Goliath (Van Oord). They featured barge-mounted excavators. Small backhoe dredgers can be track-mounted and work from the bank of ditches. A backhoe dredger is equipped with a half-open shell. The shell is filled moving towards the machine. Usually dredged material is loaded in barges. This machine is mainly used in harbours and other shallow water.

Advantages
Ø It has an ability to dredge a wide variety of material ranging from soft sand , clay , shingle , soft rock, etc.
Ø Foreign materials like scrap iron , wires, etc . It can be removed.

Ø Bucket types can be changed  to suit the ground conditions .

Disadvantages
Ø    IT  has poor stability when moving or under towage from one site to another.
Ø   Since it is mounted on pontoon ,  it is affected by the wave actions.
Ø   It is operation is noisy.

Bed leveller :-
This is a bar or blade which is pulled over the seabed behind any suitable ship or boat. It has an effect similar to that of a bulldozer on land. The chain-operated steam dredger Bertha, built-in 1844 to a design by Brunel and now the oldest operational steam vessel in Britain, was of this type.
Krab belaar :-
This is an early type of dredger which was formerly used in shallow water in the Netherlands. It was a flat-bottomed boat with spikes sticking out of its bottom. As tide current pulled the boat, the spikes scraped seabed material loose, and the tide current washed the material away, hopefully to deeper water. Krabbelaar is the Dutch word for “scratcher”.
Water injection :-
A water injection dredger uses a small jet to inject water under low pressure (to prevent the sediment from exploding into the surrounding waters) into the seabed to bring the sediment in suspension, which then becomes a turbidity current, which flows away downslope, is moved by a second burst of water from the WID or is carried away in natural currents. Water injection results in a lot of sediment in the water which makes measurement with most hydrographic equipment (for instance: single-beam echo sounders) difficult.

advanced construction technology

dredging equipment for construction ppt

bucket ladder dredgers

bucket ladder dredging equipment

grab dredging equipment

grab equipment component

diper dredging equipment

physical properties of dredging equipment

thank you


Pneumatic :-

These dredgers use a chamber with inlets, out of which the water is pumped with the inlets closed. It is usually suspended from a crane on land or from a small pontoon or barge. Its effectiveness depends on depth pressure.

Dredging equipment ppt in advanced construction technology


Thank you for visiting this website. I hope you got your problem solution to this website easily. If any problem in this website please comment in the comment section or my Gmail. Gmail id given in profile or contact me page or about me page. thank you.

REFERENCE :- 

GOOGLE

Leave a Comment

Newsletter Signup

Subscribe to our weekly newsletter below and never miss the latest article or an exclusive offer.