9781439834220.ch10

It can negotiate steeper gradients than a roadheader

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Unformatted text preview: vator–mounted cutter boom delivers the same production rate as a roadheader with identical cutter horsepower. It has a far greater cutting range, a significantly higher tramming speed. It can negotiate steeper gradients than a roadheader. This feature is of importance while constructing ramps and slopes. Excavators can have both diesel or electrical drives. If frequent long distance tramming is required, a diesel engine should be selected. A typical cutter boom attachment costs about one-fifth of the price of a roadheader with identical cutter power. Operating and maintenance costs of excavator-mounted cutter booms are normally considerably lower than with roadheaders because spare parts for standard excavators (hoes) cost less and contractors’ mechanics are familiar with excavators. In figure 10.11 a NATM (sec. 11.13) roadheader has been shown. The cutter-loader performs the same function as a NATM roadheader for about one–third of its price. At most tunneling projects the contractor does not require to buy an additiona...
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This document was uploaded on 02/12/2014.

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