Process for improved manufacture of shells for tunnel tubes

Details Process for improved manufacture of shells for tunnel tubes Process for improved manufacture of shells for tunnel tubes

1983-05-03

1984-06-19

Crane, Daniel C.

Metal fusion bonding

Process

With shaping

228173C, 72368, 72482, 72406, 242117, 254312, B21D 3900

Patent

active

044549784

ABSTRACT:
This invention relates to improved apparatus and process for manufacture of tunnel modules and tunnel sections used to build underwater tunnel tubes. A collapsible fixture is situated to roll up flat steel plate into a circular shell for the tunnel modules. A hydraulic cylinder is utilized to adjust the diameter of the fixture without collapsing it, in order to close any gaps between the ends of the plate when it is rolled into a shell.

REFERENCES:
patent: 29556 (1860-08-01), Bailey
patent: 1752061 (1930-03-01), Cameron
patent: 3879994 (1975-04-01), Hume
patent: 4082935 (1978-04-01), Lampietti et al.
patent: 4132106 (1979-01-01), Bihler

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