{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}


In this situation the work progresses in this manner

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online