Patent ID: 7568862

Claim:
A plug member for retaining grout in a substantially cylindrical bore in underground excavations, characterised in that the plug member comprises a cap portion arranged to engage with walls of the bore, the plug member including means to wedge the cap portion within the bore, the cap portion including at least one aperture arranged to receive a load bearing member in a close fit, the at least one aperture is substantially bounded by at least one resilient member, the at least one resilient member acting, in use, against the load bearing member to substantially prevent the leakage of grout, wherein the at least one resilient member comprises an enclosing means whereby the enclosing means substantially prevents the leakage of grout through the aperture when a load bearing member is not present, and the cap portion including at least one port arranged to receive a grout delivery means in a close fit, and a further port through which air may be vented.