Plastic and nonmetallic article shaping or treating: processes – Forming structural installations in situ – Sequentially molding in situ different portions or layers on...
Patent
1977-05-02
1978-11-14
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Forming structural installations in situ
Sequentially molding in situ different portions or layers on...
264228, 404 47, E04B 116
Patent
active
041255801
ABSTRACT:
A method of forming a carriageway slab comprising two or more sections with expansion joints between the sections and stressed longitudinal tensioning members extending all the way through the sections is provided. In such structures, the space between sections where the expansion joints are provided is too small to insert a press to provide necessary stress to the longitudinal tensioning members. According to the invention, the tensioning members are formed in two parts, one part of each (a longer part) extending rearwardly from the front end plate of a section and the other or shorter part extending from the rear end plate. The front portion of the section is concreted and when the concrete is hardened, the tensioning members are stressed at the end of the concreted part and fixed in stressed condition, then the shorter parts of the tensioning members are attached to the corresponding longer parts and tension is applied to the shorter sections while the position of the adjacent ends at the joint is fixed. When the concrete is hard, the attachments of the parts at the joint is loosened so that the tension originally applied to the short parts is now at least partly applied to the concrete.
REFERENCES:
patent: 2286019 (1942-06-01), Smith
patent: 2655846 (1953-10-01), Freyssinct
patent: 3022713 (1962-02-01), Friberg
patent: 3089215 (1963-05-01), Stubbs
patent: 3245328 (1966-04-01), Fassbinder
Durr Frank L.
Dyckerhoff & Widmann Aktiengesellschaft
Greene Orville N.
Pavelko Thomas P.
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