Equipment in Construction Full notes (Chapter 8)

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Equipment in Construction Full notes (Chapter 8)

Equipment in Construction Sample pdf Document

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E.g.

Dragline

• Unlike the shovel, it has a long light crane boom and bucket is loosely attached to the boom
through cables.

Because of this construction, a dragline can dig and dump over large distances
than a shovel can do.
• Clamshell excavators provide the means to excavate vertically to considerable depths.
• The greatest advantage of a dragline over other machines is its long reach for digging and dumping.
The dragline is designed to excavate below the level of the machine.
• The clamshell bucket is designed to excavate material in a vertical direction. It works like an
inverted jaw with a biting motion. The clamshell is capable of working at, above, and below ground
level.

Scraper

• It is a unique machine for digging and long-distance hauling of plough able materials.
• It is a self-operating machine. It is not dependent on other equipment. Wheel of machine cause
some compaction.
• Crawler tractor pulled and wheel tractor pulled.

Compacting equipment

a) Smooth wheel rollers:
• These are plain steel rollers, effective in compacting granular soils, such as gravel and crushed
stone.
• These are self-propelled having weight 5 to 25 tones.
• No deep compaction is achieved, as compaction is only by static weight.
b) Sheep foot rollers:
• Hollow steel drum with projected feet mounted at 100 to 200 mm c-c.
• Feet produce kneading action and a pressure to mix and compact the soil from bottom to top layer.
c) Pneumatic tyre roller:
• It is most suitable for compacting fine-grained soil and well graded sands.
• Major advantages are the ability to control the ground contact pressure by altering the weight of
machines, increasing the number of wheels, increasing tyre width.

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