Improved Apparatus for use in Tunnelling Operations.
Year: 1893

page_text: Date of Application, 12th Jan., 1893
Complete Specification Left, 12th Oct., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
Improved Apparatus for use in Tunnelling Operations.
I, GEORGE TALBOT of The Villa, Hemingborough near Howden, Yorkshire,
Contractor do hereby declare the nature of this invention to be as follows :—.
This invention has for its object to dispense in a large measure with the use of
individual props for holding up the planking which supports the roof between the
shield and the extreme end of a tunnel where excavations are proceeding whilst
providing a safer support for the roof.
To that end I employ a segmental or arched rib composed of wood, iron or other
material but preferably built of segmental pieces of wood bolted together, said rib
being placed between the shield and the temporary props erected to support the
planking laid against the roof and sides of the tunnel being driven.
This rib which replaces the several props placed to support the individual planks
on the roof and sides, is carried by a sill of timber supported transversely of the
tunnel at any couvenient height, its lower ends or extremities resting on wedge
pieces, whilst between its outer periphery and the roof and side planking wedges
are driven in to provide solid bearing for said planking. When in the course of
lining or building the tunnel the shield is moved forward and a fresh excavation
made, the roof being then supported by the shield the rib is removed by simply
striking out the wedges and it may be hung upon the shield or otherwise supported
without being taken to pieces whilst the roof and side planking is extended; and
after temporarily propping the ends the rib is erected in its new position.
Dated this Eleventh day of January 1893.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improved Apparatus for use in Tunnelling Operations.
I, GEORGE TALBOT of The Villa, Hemingborough near Howden, Yorkshire,
Contractor do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
.
This invention has for its object to dispense in a large measure with the use of
individual props for holding up the planking which supports the roof between the
shield and the extreme end of a tunnel where excavations are proceeding whilst
providing a safer support for the roof.
As represented in the accompanying drawings in longitudinal vertical section at
Figure 1 and in sectional end elevation at Figure 2 I employ for that purpose a
segmental or arched rib A composed of wood iron or other material but preferably
built as shewn of segmental pieces of wood bolted together said rib being placed
between the shield B when such is used and the temporary props CC erected to
support the planking D laid against the roof and sides of the tunnel being driven.
This rib A which replaces the several props placed to support the individual
planks on the roof and sides is carried by a sill E, E', of timber supported trans-
versely of the tunnel at any convenient height its lower ends or extremities resting
on wedge pieces F whilst between its outer periphery and the roof and side
planking D wedges Gare driven in to provide solid bearing for said planking,
When in the course of lining or building the tunnel the shield B is moved forward
and a fresh excavation made, the roof being then supported by the shield the rib A

page_text: is removed by simply striking out the wedges F and it may be hung upon the
shield or otherwise supported without being taken to pieces whilst the roof and
side planking is extended and after temporarily propping the ends the rib is erected
in its new position.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. The improved apparatus herein before described with reference to the
accompanying drawings for use in tunneling operations.
2. In apparatus of the class set forth the use of the movable rib A carried by a
sill E, E' for supporting the roof planking in tunneling operations substantially as
described.
to Dated this 11th day of October 1893.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.