GB1507937A - Method of and apparatus for setting roof supports in the form of arches - Google Patents

Abstract

1507937 Method and apparatus for setting lagged roof supports RUHRKOHLE AG and BOCHUMER EISENHUTTE HEINTZMANN & CO 1 July 1975 [5 July 1974] 27776/75 Heading E1F A method of setting roof supports in the form of arches in an underground road involves the use of an assembly jig 6 having a raisable and lowerable assembly table 48 on which at least two roof girder sections 5' together with lagging 51 can be assembled with the table at a convenient height and the whole jig (carrying any other components for completion of the arch section) moved through an unobstructed section of the road between roof and sides where the table can raise the completed roof section into position and attach leg sections 5" and their lagging. The assembly jig 6 is formed from two frame sections 7, 8 designed to move in a space 12 between the tunnel walls and roof and a tunnelling machine 2 and linked by struts 9, 10, 11. The space between sections 7, 8 is used to store lagging and connecting bolts etc, and strut 10 projects forwardly and carries holders 24 for girder leg sections 5". At each side of the jig a ram 29 attached to strut 10 can raise and lower, via chain 29a, a parallel bar linkage 27, 28 which is pivoted at one end to section 7 and at the other to a plate 34. An intermediate plate 37b is linked to each plate 34 at pivot 36 and via an adjusting ram 39. A plate 37 is slidable transversely in guides 37a on plates 37b under the action of ram 37c and carries fingers 40 which consist of telescopic sections extendable by rams 44. The fingers engage in guides 49 in the assembly table 48 which has longitudinal members defining a curved upper surface to receive roof girder sections 5'.