Static molds – In situ construction engineering type or building type-mold... – Forming building structure
Patent
1986-11-04
1989-10-17
Woo, Jay H.
Static molds
In situ construction engineering type or building type-mold...
Forming building structure
249 20, 249 45, 249 48, 249144, 249153, 249191, 249192, 249194, E04G 1120
Patent
active
048741507
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a segmental formwork for round structures, having a framework with soldiers and stretchers and formwork panels that are attached pointwise thereto, the stretchers being polygonal and angularly adjustable.
Especially in the case of round structures with a very large diameter, not the whole wall is clamped with boards at one go, but wall sections, so-called segments, are clamped with boards, then filled with concrete. After such a wall section has been covered with concrete, the formwork is removed and an adjoining wall section is covered with concrete.
In a prior art segmental framework of this kind, the stretchers are formed from articulated counter battens that are fixed to vertical sections forming the soliders. The vertical sections support the formwork shell and furthermore the binding-through occurs in each case from an internal to an external articulated counter batten.
Admittedly, because of the shape of the stretchers, formwork segments of this kind can be adapted as articulated counter battens to different building diameters, but the formwork shell must be fully separated from the soldiers when the radius of curvature is changed. In addition, in many cases the soldiers of the internal and external formwork must be realigned to one another.
The invention has for its object the provision of a segmental formwork of the kind mentioned in the introduction, in which the radius of curvature can be changed without requiring the formwork panels of the formwork shell to be dismounted from the framework supporting them, i.e., from stretchers or soliders. This should be possible both in the case of an external and an internal formwork.
According to the invention, this can be achieved by making the stretchers bear directly against the formwork boards that have an at least substantially continuous curvature and by making the fixing points of the formwork boards on the framework slidable in the horizontal plane.
As a result of the design of the segmental formwork embodying the invention, the matching to different building diameters is greatly accelerated and facilitated.
Advantageously, provision is made that the stretchers have channel sections, L-beam sections or I-beam sections.
In contradistinction to conventional segmental formworks in which the soldiers and the stretchers bear sidewise against one another, whereby the soldiers are usually arranged between the stretchers and the formwork shell, provision is made in one embodiment of the invention that the soldiers are placed between the stretchers and are bonded thereto, preferably by welding.
Advantageously, in the case of an internal formwork the soldiers are arranged at the buckling points of the stretchers and, in the case of an external formwork, midway between the buckling points of the stretchers.
To facilitate the buildup of a relatively large formwork segment from several segmental rings, provision is advantageously made that the stretchers are arranged at the edges of the formwork boards and have projecting parts, so that, when the formwork panels are superposed on one another, the adjoining stretchers are locked through their shape.
In addition, provision is advantageously made that the formwork panels are secured to the soldiers, which have horizontal slots through which extend the retaining bolts or the like.
The resulting differences arising in the length of the formwork shell can be compensated by adding or removing secondary reinforcements that can be interposed between the formwork shell or between the soldiers. In another provision, gripping jaws are clamped onto the stretchers, preferably onto those that are located in the upper edge of the formwork panels; bind-through rods act on these gripping jaws. These gripping jaws can slide along the sections of the stretchers, so that when the curvature of the shell is changed, the bind-through rods can be aligned in rapid and simple fashion to the new geometric center of the circles of curvature of the internal and external framework.
Advantageously, provision is made th
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patent: 1327481 (1920-01-01), Kulow
patent: 2885762 (1959-05-01), Johanssan
patent: 4185805 (1980-01-01), Ewing
patent: 4540150 (1985-09-01), Tzincoca
patent: 4557090 (1985-12-01), Keller, Sr.
Housel James C.
Jugo-Import-Export-Anstalt
Woo Jay H.
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