Static structures (e.g. – buildings) – Installed screed or unit with specified feature retaining... – Stonelike material base type; e.g. – concrete set
Reexamination Certificate
2000-02-01
2001-09-18
Stephan, Beth A. (Department: 3635)
Static structures (e.g., buildings)
Installed screed or unit with specified feature retaining...
Stonelike material base type; e.g., concrete set
C052S396020, C052S600000, C052S667000, C052S584100, C404S048000, C404S068000, C403S269000
Reexamination Certificate
active
06289645
ABSTRACT:
The invention relates to a concrete form or shuttering element.
Prior to the forming of a concrete section, a shuttering is usually erected and has fluid concrete cast into it in order to form the concrete sections. Such a shuttering is usually made up of shuttering panels which, in most cases, comprise wooden boards. Shuttering panels made of steel, plastic, or aluminum are also known.
Such concrete sections are horizontal floor or ceiling parts or vertical wall parts which each have two mutually parallel, large-surface-area side surfaces and four narrow end surfaces.
In the case of horizontal concrete sections, the floor and ceiling sections, the underside of the concrete section which is to be erected, and the end surfaces thereof, have arranged on them shuttering panels which form a tray-like shuttering. For erecting vertical concrete sections, such as the wall sections, shuttering panels for the two vertical, large-surface-area side surfaces and for the vertical end surfaces are erected. These form a narrow, elongate, box-like shuttering. The shutterings are filled with fluid concrete. Once the concrete has hardened, the concrete section is released by the shuttering being removed.
According to DIN 1045, large-surface-area concrete sections are to be divided up into a plurality of subsections, thus forming, between the subsections, expansion or construction joints which are located at the abutment regions of the subsections.
In order to produce such subsections, in the shuttering or horizontal concrete sections, individual regions are separated off by vertical shuttering panels positioned in the tray-like shuttering.
Herein below, the tray-like shuttering for the horizontal concrete sections and the box-like shuttering for the vertical concrete sections will be covered by the umbrella term “main shuttering” and the shuttering introduced in the main shuttering in order to subdivide the concrete section into concrete subsections will be referred to as “separating shuttering”.
For filling a main shuttering subdivided into a plurality of subsections by a separating shuttering, only every second subsection is cast in a first casting operation, with the result that the adjacent subsections are free of concrete. Once the concrete has hardened, the separating shuttering is removed and the free subsections are cast. The first casting operation thus results in a pattern in which the filled and non-filled concrete subsections are arranged in a manner similar to the black and white squares on a chess board.
For setting up a separating shuttering for a reinforced concrete section, the separating shuttering, in the region of crossing reinforcement struts, has to be adapted to the latter. In this case, individual shuttering elements are put together around the reinforcement struts and nailed to one another. Setting up shuttering for reinforced concrete sections thus involves considerable outlay in terms of the work involved. For dismantling the shuttering following the concreting operation, the shuttering elements have to be removed again, the separating-shuttering regions engaging around the reinforcement struts being broken out. The operation of dismantling the shuttering is thus at least as work-intensive as the operation of setting up the shuttering. The task of subdividing reinforced concrete sections into individual concrete subsections is associated with considerable outlay in terms of the work involved since the separating shuttering has to be adapted to the reinforcement and, following the casting operation, has to be disengaged from the reinforcement.
In the case of vertical concrete sections, such a subdivision into a plurality of subsections is not customary since further shuttering boards would have to be fitted in between the opposite shuttering boards of the box-like shuttering and this would involve considerable outlay. For the erection of wall sections, therefore, for the specific production of racks, predetermined-crack joint rails (DE 44 22 648 A1) are inserted, these producing, at certain locations, a specific crack which can be sealed subsequently. This ensures the sealing function of the wall. However, a subdivision into a plurality of concrete subsections is not possible with these predetermined-crack joint rails. A large-surface-area and sealed concrete section can be produced by the provision of predetermined cracks. However, the predetermined cracks on the surface of the concrete sections, rather than forming a rectilinear visible edge, have an irregular progression which is not pleasing to the eye.
The object of the invention is to provide a shuttering element which considerably simplifies the outlay in terms of the work involved for erecting a separating shuttering and which allows the shuttering to be filled quickly with fluid concrete. This object is achieved by a shuttering element having the features of claim
1
. Advantageous configurations of the invention are defined in the subclaims.
The shuttering element, according to the invention for separating a concrete section into concrete subsections, is of strip-like form and is adapted widthwise to the thickness of the concrete section. The shuttering element has a shuttering board which is formed from a thin-walled, sheet-like material and, once the concrete subsections have been filled, can remain between the concrete subsections.
The thin-walled, sheet-like design of the shuttering element means that it is not necessary for the shuttering element or the shuttering board to be removed from between the concrete subsections. This renders the work involved during the casting of the fluid concrete considerably easier since all the concrete subsections can be cast at the same time, and the casting of the concrete section as a whole need not be subdivided into two concreting operations. The period of time which is necessary for casting a large-surface-area concrete section can be reduced, by means of the shuttering element according to the invention, to approximately ¼ of the usual period of time necessary for casting the fluid concrete.
In addition, in the case of horizontal concrete sections, it is possible for the top edge of the shuttering element to be used as a stripping edge, once the concrete has been cast, in order for the fluid concrete to be distributed evenly and uniformly by a stripper over the individual concrete subsections. This renders the work involved considerably easier.
In a preferred embodiment, the shuttering element is provided with recesses for reinforcement struts, so that the reinforcement struts can extend through the shuttering element in the region of the recesses, thus achieving a further important advantage of the invention. This shuttering element can be inserted into a main shuttering easily and quickly as a separating shuttering, even if the separating shuttering and reinforcement struts of a reinforcement are to cross, since the shuttering element can be fitter easily and quickly on the reinforcement struts.
The joints formed by the shuttering element according to the invention have an esthetically pleasing rectilinear progression. In particular, if the shuttering element is designed as a triangular strip in its border region adjacent to the visible side of the concrete section, this gives a pleasing joint progression since it is not possible for any concrete bridging to form on the relatively wide edge.
The joint board is preferably provided with one or more functional elements such as an injection channel, an injection tube, an expanding strip or transverse webs, which ensure the sealing of the joint between two concrete subsections separated by the shuttering element according to the invention. The functional elements may be provided individually or in combination on the shuttering element according to the invention.
REFERENCES:
patent: 3267631 (1966-08-01), Hammitt
patent: 3530633 (1970-09-01), Scott
patent: 4184297 (1980-01-01), Casamayor
patent: 4506481 (1985-03-01), Witschi et al.
patent: 4804299 (1989-02-01), Forte
patent: 4858411 (1989-08-01), Graham
patent
Agrar Chemie AG
Glessner Brian E.
Harness & Dickey & Pierce P.L.C.
Stephan Beth A.
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