Title: Method of site casting tunnels, culverts, pressure pipes with minimum forming

Abstract: A method is disclosed for the construction of structures for tunnels, culverts, and pressure pipes of any size and shape, straight or curved, constant or variable cross section. The method requires very little formwork, with all work done on site. The method discloses the casting of a lower half of the structure as a continuous element, and the method of utilizing this half as a form in which modular lengths of the upper half of the structure are cast, lifted, inverted, and lowered to form the complete structure. Various methods are disclosed for joining the modules comprising the upper half of the structure to provide various degrees of structural continuity and fluid tightness.

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Inventors: Johnson, Delp W. (240 Oakview Dr., San Carlos, CA, 94070)

Application Number: 06/074084
Filing Date: 1979-09-10
Publication_date: 1982-02-09
Assignee: Johnson, Delp W.

Primary Class(es): 405/155 425/59, 249/11, 138/157, 29/424, 138/155, 29/458, 138
Other Classes: F16L1/036; F16L1/028; E02D29/10
US Patent Ref:

1052198	February, 1913	Wyre	405/124
1144692	June, 1915	LaMare	249/11
1995716	March, 1935	Millsom	138/105	Conduit
2005699	June, 1935	Gottwald	138/157	Conduit and like construction
2786255	March, 1957	Heeb	249/11	Form for pouring concrete ditch dams

Other Refs: FR910476

June, 1946

405/124

Primary Examiner: Taylor, Dennis L.
Assistant Examiner:
Attorney: Miller, Alfred E.

Claims:

I claim:<