Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Subaqueous
Patent
1982-03-23
1984-02-28
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Subaqueous
405132, 405136, 405194, E01G 404
Patent
active
044339372
ABSTRACT:
In a tunnelling method, a completely submerged caisson is received in a recess in the floor of a body of water. The caisson includes a pressurized bell-type work chamber that is open at the bottom and closed at the top to trap breathable gas inside it. An access passage extends from the upper end of the caisson which, during the initial excavation stage, communicates with the work chamber below the water level in the chamber. Excavation workers swim down through the access passage to the work chamber and excavate the body floor underneath the work chamber while breathing the gas contained in it. The caisson as lowered progressively further down into the recess formed below the work chamber as excavation proceeds until the desired tunnelling depth is reached. Then the chamber is sealed from the water body and the chamber pressure reduced to atmospheric so that tunnelling in a generally horizontal direction to land beyond the water body can proceed at that pressure.
REFERENCES:
patent: 742222 (1903-10-01), O'Rourke
patent: 788611 (1905-05-01), Stone
patent: 838389 (1906-12-01), Dayde et al.
patent: 1009312 (1911-11-01), Jackson
patent: 3530677 (1970-09-01), Ede
patent: 4123858 (1978-11-01), Batchelder
patent: 4255068 (1981-03-01), Valantin
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