Preload headboard for an elongate prop

A headboard for an elongate prop, the headboard being dimensioned to support a preload bag inflatable with a settable grout, the headboard comprising:

• a pressed steel sheet support member which has a substantially rectangular shape in plan view and which has relatively higher end regions lying in a common plane and a relatively lower central region which is formed with an opening therein and which is situated between the end regions,
• bag retaining formations which are in the form of flexible steel flaps connected to opposite ends of the support member and extend inwardly over the end regions of the support member, the flaps being shaped to locate over opposite ends of a preload bag located in use upon the support member, and
• an open-ended pot which is releasably engagable at an inverted orientation, in the opening in the central region, the pot being dimensioned to receive the upper end of an elongate prop and having a base against which the end of the prop bears when fully received by the pot, the base lying in substantially the same plane as the end regions of the support member, so that the support member is supported transversely on the end of the prop with the base of the pot and the end regions of the support member providing support for a preload bag placed on the support member with its ends located beneath the flaps.