Plastic and nonmetallic article shaping or treating: processes – Forming structural installations in situ – Arched – domed – or vertical-cylindrical structure
Patent
1977-02-16
1978-02-28
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Forming structural installations in situ
Arched, domed, or vertical-cylindrical structure
249 17, 249 19, 264 35, 264274, 425DIG126, E04B 116
Patent
active
040767779
ABSTRACT:
Each one of a plurality of sector-shaped form members for a reinforced concrete or postensioned roof supported by a circumscribing wall, footing, columns or the like of a large building structure has an eyebolt located near its center of gravity to permit raising and lowering the form. The forms are lifted by this eye and successively positioned with their wide ends supported by brackets fastened to the circumscribing walls, footings, or columns and supported near their narrow ends by a central staging structure. If the building structure has circular walls or columns for supporting the roof, a pivoted station at the wide end of each form member provides a work platform for access to the bracket fastening means. When all of the forms are in place, their narrower ends define an opening which is centrally located. The forms are then covered by a layer of reinforced concrete. Holes are left in the roof at each eyebolt. An access opening of predetermined size is left in the center of the roof above the opening defined by the narrower ends of the forms. After the concrete has cured, the forms are each secured to the roof by the eyebolt which extends through the rod. A metal plate coupled to the eyebolt and engaging the upper surface of the rod enables the newly made roof to carry the forms. The staging is then removed through the access opening. The cable of a crane is then connected to the eyebolt of a given form. When the cable is tensioned, the load of the form is transferred from the roof to the cable and this enables the metal plate to be released from the eyebolt. The wide end of each form is then disengaged from the circumscribing wall, and each form is lowered to the bottom of the structure by the cable attached to the lifting eye. During lowering, the eyebolt and cable pass through the hole in the roof. After lowering, some or all of the forms, a lifting line is attached to each form near its narrow end such that the form will hang suspended from the lifting line with the wide end beneath the narrow end. In this position the form is hoisted by the lifting line through the access opening in the roof. The forms are then available to be placed on the wall or footing of the next structure when a plurality of structures are to be erected at a common site. If simply a single roof is being built, the forms can be reused with some modification on another project. The roof is completed by filling the holes for the eyebolts and by providing a closure for the access opening.
REFERENCES:
patent: 820224 (1906-05-01), Lucas
patent: 1124995 (1915-01-01), Bielenberg
patent: 2816323 (1957-12-01), Munger
patent: 3161703 (1964-12-01), Watson
patent: 3275719 (1966-09-01), Dudson
patent: 3461192 (1969-08-01), Di Stasio
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