| 摘要 |
UK Patent Number GB2358417 by this inventor describes how concrete structures of the North Sea oil industry can be used for accelerated construction of underwater tunnels in maritime locations. The present invention describes technical improvements to this art, these being methods with details of materiel for: setting a starter caisson through deep soil into the bearing stratum for commencement of shaft sinking operations in dry conditions, the dry conditions being achieved by ensuring that cement placement is successful and further, that if partially unsuccessful, that remedial placement of cement is feasible; converting the full-bore construction shaft, which provided support to and access for tunnel-boring operations, to a suite of shafts for essential functions of a completed and working tunnel system; ensuring that completed function shafts can seal against catastrophic ingress of seawater into the main central shaft; provision of ventilation for ultra-long tunnels for which several offshore structures are necessary to ensure operability after construction. |
