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APOLLO INSTITUTE OF ENGINEERING & TECHNOLOGY

Advanced Construction & Equipments (2160601)

DRAGLINE

Submitted to :-Proff. Purvesh Raval

Submitted by :-Parth Maheta (141210106020)

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CONTENT :- Introduction Working Applications Factors Affecting Some Types Advantages & Disadvantages

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INTRODUCTION Dragline falls in heavy equipment’s category.   Dragline excavator is used for civil engineering

projects and surface mining. Dragline is the largest equipment ever built on

this planet. It has the ability to excavate very deep down the earth.

Word drag is used because it has the ability to drag material at far distance from the machine.

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Dragline consists of drag cable, large bucket, boom, hoist cable, drag chain and driving motors.

DRAGLINE EXCAVATOR

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WORKING OF DRAGLINE The bucket is lowered in fully dumped position,

released both hoist & drag cable, till it rest on ground with the teeth digging into earth.

The hoist cable is slackened slightly and then the drag pull is applied . This action fills in earth and bucket takes horizontal position. It is then hoisted.

When dumping height is attained, the boom is swung to the position of dumping and the drag brake is released. This will dump the load of bucket.

The boom is swung back to digging position and the same cycles are proceed.

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WORKING OF DRAGLINE

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APPLICATIONS Most suitable for digging softer material. Useful for excavating trenches. Mostly used in excavating canals &

embankments. Suitable for loose soils, marshy land and areas

containing water.

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FACTORS AFFECTING ON DRAGLINE

Size & Type of Bucket :- Light Bucket : for loose, dry soils, sand &

gravel. Medium: for clays & compacted gravel. Heavy : for hard & broken rocks. Length of Boom :- Longer boom with smaller bucket increased

digging rate. It is possible of dispose off the earth in one

operation so cost and time is saved. Type of material :- loose, dry & soft soil => Output More. Hard & Tough soil => Output Less.

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FACTORS AFFECTING ON DRAGLINE

Angle of Swing :- The time cycle is directly proportional to angle of swing. If Angle of swing increases, output decreases.

Depth of cut :- If work at optimum depth and A.O.S=90, output will be max.

optimum depth depends on type of soil & size of bucket, if bucket size is increase,

optimum depth of cut also increases.

Size of Hauling unit :- The hauling units (trucks) of desired sizes should be made available, to avoid delay, to get more output.

Skill of Operator

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TYPES OF DRAGLINES Crawler mounted draglines :- low travel speed. suitable for soft ground. Wheel mounted draglines :- high travel speed. suitable for firm ground. Truck mounted draglines :- same as wheel mounted.

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ADVANTAGES & DISADVANTAGES OF DRAGLINE

ADVANTAGES it can work on natural ground while power shovel take a pit or trench.

hauling units do not have to go into trench while using dragline.

range of working is more than power shovel.

excavated material disposed off in one operation.

DISADVANTAGES it has less digging force than P.S

output is less than as compared to shovel.

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Thank You