✍ Scribed by Richard Robbins; Martin Kelley
No coin nor oath required. For personal study only.
The decisions that lend up to the start of a major undersea tunnel will be the principal factors in determining the degree of succses of the project. This is especially true if the geologic conditions are difficult. Many factors can conspire against success, including some which might at first appear to benefit the owner. This paper covers issues from the uiewpointd of a tunnel machine manufacturer and a contractor. The uses of undersea tunnels are discussed, as are the types of machines that should be considered, us determined by the geologic conditions. Probe drilling, considered the most reliable method of detecting hazardous conditions ahend of the face, is reviewed. The state-ofthe-art in pressure bulkhead shields is detailed. The contractor's viewpoint focuses on issues of risk sharing. The categories of risk and proper allocation of these risks are discussed, us well as the most effectiue methods of Umiting and resolving disputes. The authors describe the contractor's expectations of the tunneling machine supplier, both before the construction contract is signed and after the selection of a machine.
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