Saturday, October 30, 2010

Scrapers used for clearing the site

It is a digging and carrying device which picks up its own load by scraping the ground, and transports it to site. After discharging the material it spreads the same over the desired area and returns to the pit site for scraping the next load. It consists essentially of a large scoop with a cutting edge. The scoop is a bucket or shallow container of steel known as bowl or body.

It is this bowl or body which excavates, transports and dumps the material, where required. Scoop is designed to excavate, load and transport the material  over a relatively short distance upto about 450 meters or  half kilometer. The cutting edge of this scoop excavates  the earth and the excavated material is collected in the  body of the scraper through the body from the front gate of the bucket. This material is discharged at the site from the rear gate of the bucket. Thus this machine is the most economical and useful for earthwork operation of a project as it is self- operating to the extent of loading, hauling and discharging material at the site. 

Three types of scrapers are available
Towed Scrapers – these consist of four wheeled scraper bowl which is towed behind a power unit such as a crawler tractor
Three Axle Scrapers – these consist of a two wheeled scraper bowl which may have a rear engine to assist the four wheeled traction engine which makes up the complement.
Two Axle Scrapers – these have a two wheeled scraper bowl with an attached two wheeled power unit.

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