Abstract: The subject invention relates to a straddle cartridge for a straddle cartridge anchor having a central bore which is adjusted to the conicity of the anchor head and wherein the cartridge parts are held together by means of straddle members arranged in succession parallel with respect to the cartridge axis and in direction of the thick ends of the cartridge parts extending outwardly from the outer walls of the cartridge parts.

Abstract: A tunnel-lagging element, adapted to be embedded in spray or injection concrete for the lining of the wall of a tunnel, comprising a pair of reinforcing bars which are held substantially against the tunnel wall, and a further pair of such bars spaced from the bars of the first pair. The bars at the central third of their lengths are fixed to one another against relative movement by straps while, toward the ends of the element, the bars of the two pairs are held together with limited freedom of longitudinal movement. The entire assembly of bars and straps can be embedded in the concrete lining.