Static molds – In situ construction engineering type or building type-mold... – Forming road – side walk – or curb in situ
Patent
1993-11-18
1996-02-20
Woo, Jay H.
Static molds
In situ construction engineering type or building type-mold...
Forming road, side walk, or curb in situ
249 1, 249 18, 249 40, 249154, 249155, 249182, 249189, 249191, 249210, 2492191, E04G 1100
Patent
active
054923034
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to formwork for surfaces varying in curvature, including a face sheet adjustable with respect to its curvature, including girders supporting the face sheet and further including a boom system composed of individual boom members applied to the girders in spaced relationship to the face sheet, the effective length of the boom members between the girders and their points of application being adjustable at the girders to change the curvature of the face sheet, and mutually opposed formwork elements being adapted to be braced by means of formwork anchor ties.
Such formwork is known from German Patent Specification No. 24 26 708. In that reference, the boom members are formed by oppositely threaded tie rods engaging with a threaded sleeve on either side, so-called turnbuckles, rotation of the sleeve bringing about the desired change in length. On account of the distance of the boom members from the face sheet, the curvature of the face sheet can be changed through such a change in length. In each case one end of the rod engages a girder and it is necessary for the mutually opposed girders of the formwork elements to be braced together by means of formwork anchor ties in order that the distances of the mutually opposed formwork elements are maintained, particularly when the concrete is being poured in. This formwork has proved successful, but requires a relatively large number of formwork anchor ties because these are present on each girder.
Formwork having a face sheet changeable with respect to its curvature is already known from European Patent Specification No. 0 139 820, in which no formwork anchor ties whatsoever are provided for the mutually opposed formwork elements. This signifies, however, that the formwork elements of the mutually opposed surfaces are completely separate from each other, so that the slightest inaccuracies during erection lead to deviations in the thickness of the wall to be concreted. In addition, during the process of concrete placement there is the danger that--through the concrete often poured in suddenly and quickly--formwork walls, which may initially have been accurately in position, become misaligned or moved. This likewise results in inaccuracies to the finished concrete wall.
SUMMARY OF THE INVENTION
The object underlying the invention is therefore to provide formwork of the kind mentioned at the outset, which needs fewer formwork anchor ties but wherein provision is nevertheless made for the mutually opposed formwork elements to be braced together.
This object is accomplished in that a crosspiece in the form of a boom member is applied to a formwork element at at least two girders and is simultaneously provided as an abutment for the formwork anchor tie, the crosspiece being adapted to be adjusted and located in position at at least one of the girders it acts upon, adjustment being effected in the longitudinal direction in which the crosspiece extends and transversely to the orientation of the girder.
In this manner, crosspieces my serve to adjust the distance of the girders and thereby to change the curvature and also simultaneously serve as an abutment for a formwork anchor tie between two girders, halving the number of formwork anchor ties as compared with a solution having tie points at each girder. Nevertheless, the reaction forces of the formwork anchor tie can be introduced into the two girders adjacent thereto by way of the crosspiece. In an advantageous way the design of a boom portion or boom member as a crosspiece capable of transferring forces arising transversely to the path it takes can hence give the boom member a dual function.
It is suitable if the abutment location for the formwork anchor tie is arranged on the crosspiece between the locations at which the crosspiece is fastened to two adjacent girders and the crosspiece rests against and preferably laps over the girders particularly at the sides thereof averted from the formwork. The crosspiece hence bridges two girders and can transfer the tension force
REFERENCES:
patent: 2616148 (1952-11-01), Hawes
patent: 3659978 (1972-05-01), Svensson
patent: 3767158 (1973-10-01), Mikus
patent: 4433826 (1984-02-01), Schimmel
patent: 4520989 (1985-06-01), Digh
patent: 4553729 (1985-11-01), Connors
patent: 4619433 (1986-10-01), Maier
patent: 4729541 (1988-03-01), Maier
patent: 4917346 (1990-04-01), Mathis
patent: 5125618 (1992-06-01), Saervoll
Dang Vi Duong
Paschal-Werk G. Maier GmbH
Woo Jay H.
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