Circular formwork

Static molds – In situ construction engineering type or building type-mold... – Forming building structure

Reexamination Certificate

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Details

C249S004000, C249S020000, C249S194000, C249S212000

Reexamination Certificate

active

07048249

ABSTRACT:
Disclosed is a formwork element (1) which can be assembled with other formwork elements (1) so as to form a formwork structure. A formwork shell (4) having an adjustable curvature is supported by means of back supports (5) so as to create a stiff formwork element (1) that sustains concreting pressure. The supports (5) have a preferably trapezoidal cross section and are provided with fastening flanges (6) on the edges thereof and at least one girder (7) that is located at a distance from the formwork shell (4). The length of the girder (7) is adjustable in order to set or modify the curvature of the formwork shell (4) which is mare of steel or plastic. Intermediate pieces (9) are disposed between the fastening flanges (6) of the supports (5) and the formwork shell (4). The fastening flanges (6) are fixed to said intermediate pieces (9) so as to be pivotable or tiltable relative thereto about the longitudinal direction thereof. The cross section of the flanges and/or the intermediate pieces (9,12) having a convex shape or being provided with slopes (61).

REFERENCES:
patent: 4619433 (1986-10-01), Maier
patent: 4729541 (1988-03-01), Maier
patent: 5125617 (1992-06-01), Miller
patent: 5492303 (1996-02-01), Jaruzel
patent: 5669188 (1997-09-01), Jaruzel
patent: 2002/0139917 (2002-10-01), Arozena Bergaretxe
patent: 24 26 708 (1975-12-01), None
patent: 88 15 339.8 (1989-05-01), None
patent: 3841579 (1990-06-01), None

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