| 摘要 |
<p>Apparatus (2) for supporting injected wet concrete (4) during the formation of a concrete tunnel (6), the apparatus (2) comprising a tube (8) and a plurality of ring members (10) positioned inside the tube (8), and the apparatus (2) being such that in use the wet concrete (4) is injected around the outside of the tube (8) and is supported by the tube (8) until the wet concrete (4) dries and becomes self-supporting, the ring members (10) prevent the tube (8) collapsing inwardly due to external pressure, the tube (8) is formed by a plurality of elongate members (12) which extend longitudinally and which are arranged side by side in a circle, the ring members (10) extend transversely across the tube (8), and the elongate members (12) are flexible and movable relative to one another thereby enabling the tube (8) to bend and allow the concrete tunnel (6) to be formed with curves.</p> |
