9781439834220.ch10

In this situation the work progresses in this manner

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Unformatted text preview: re than 70 m2; due to large sized face hammering and muck handing operations can be carried out simultaneously. In this situation the work progresses in this manner: ● ● Excavation by hammer and scaling; Muck handling by the excavator Supporting the tunnel using type of support as applicable. For the longer tunnels; if the tunnel can be driven in two opposite directions from its middle position; it gives added advantages of the best use of the resources – men, machines and services. For tunnels exceeding 7 m heights, the work can be divided into two benches.5 © 2005 by Taylor & Francis Group, LLC TUNNELING BY ROADHEADERS AND IMPACT HAMMERS 247 Front view 2 1 Front view Side view 2 2 1 2 10 9 10 8 7 6 5 6 4 3 4 2 1 Progressing 8 2 5 3 2 (a) Hammer’s working sequence for normal ground conditions. Upper:- At the beginning of cycle Lower:- On the completion of cycle 4 5 1 2 (b) Hammer’s working sequence when ground formations are inclined Hydraulic hammer’s working sequence Figure 10.8 Hydraulic hammer’s working sequen...
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This document was uploaded on 02/12/2014.

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