CH685442A5 - Basket for holding cast concrete at sides of reinforced ceiling - Google Patents

Abstract

The basket consist of a plain concrete front plate (1) and a row of secured uniformly spaced, U-shaped reinforcing rods (2). The anchoring is carried out via the web (4) of the U-shaped rods. The two longer shanks (2, 3) protrude orthogonally from the front plate. When the basket is set on the building work, the short webs are located vertically and mutually adjacent, while the long shanks are located horizontally in the plane of the constructed reinforced ceiling. Pref. the long shanks are differently spaced from the front plate top and bottom edges.

Description

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CH 685 442 A5

2nd

description

To pour reinforced concrete ceilings, in addition to the lower formwork, which carries the reinforcing bars and the weight of the concrete that has not yet hardened, further, side formwork elements are required, which hold the still liquid concrete on the edge of the slab to be cast and run down along the prevent load-bearing wall. For this purpose, formwork boards are usually laid along the load-bearing wall, the height of which corresponds at least to the thickness of the ceiling to be cast. These formwork boards are attached using spacers on the one hand to the existing wall below the ceiling, and on the other hand are supported from the outside by struts, so that they can withstand the pressure of the liquid concrete and the stress caused by vibration when concreting the ceiling.

The laying of such edge cladding is always associated with a certain amount of time and thus also financial effort, and attempts have been made in various ways to avoid this additional effort. It is known e.g. the use of so-called shuttering baskets, i.e. Elements consisting on the one hand of an edge plate made of insulating material and a number of reinforcing irons fixed to it, the edge plate being held in place by steel angles which are connected to the former by holding elements. These formwork baskets are available in standardized sizes, e.g. manufactured and used with a width of one meter.

Such formwork baskets work to satisfaction if certain conditions are met. However, they have certain disadvantages: the insulating panels used as edge cladding are not mechanically very solid and break easily under excessive loads; in addition, the angles used for fastening to the slab formwork remain in the cast concrete, and finally the insulating boards cause additional costs and are not always necessary or desirable.

The shuttering basket according to the present invention is a component for the simple creation of formwork for the edges of reinforced concrete ceilings, which avoids these disadvantages mentioned. It contains only the materials required for the reinforced concrete ceiling and can be easily installed on the prepared formwork without the use of additional vertical formwork boards. After the concrete has hardened, no unnecessary parts have to be removed; the edge of the cast ceiling resting on the outer walls presents itself immediately in finished condition. Additional elements for holding a protective railing for the further bricking up of the next upper floor can be integrated into the formwork basket according to the invention if desired.

The shuttering basket according to the invention consists of a vertical according to claim 1

End plate made of non-reinforced concrete, to which a series of U-shaped reinforcing bars pointing inwards in the horizontal direction are attached at regular intervals. The U-shaped reinforcement bars protrude with their two vertically superimposed longer legs in a horizontal direction perpendicularly from the face plate into the plane of the concrete to be concreted and are attached to the face plate with their short vertical connecting piece.

After the formwork basket has been positioned, the reinforcement bars required for reinforcing the inner part of the ceiling are then connected in the usual way to the horizontal bars of the formwork basket lying one above the other, and thus result in complete reinforcement for the ceiling to be cast. The edges of the ceiling resting on the outer walls present themselves immediately in the finished state without any further shuttering work after concreting. The shuttering basket according to the invention can of course also be used for ceilings that lie on the inner layer of a two-shell masonry, or for ceiling parts inside a building.

When concreting corners of a building ceiling, it is inevitable that the reinforcing bars pointing inwards of two neighboring formwork baskets cross. In order to avoid that the crossing bars lie on the same plane and are therefore in the way of each other, the formwork basket according to the invention is constructed in such a way that the reinforcing bars protruding inwards are not arranged symmetrically with respect to the outer concrete slab, but with unequal distances from the top or bottom edge of the plate, the deviation from the center of the plate corresponds to at least half the thickness of a reinforcing iron. The two reinforcement baskets adjacent to one corner are then rotated relative to one another during assembly in the vertical plane, such that the inwardly projecting rods of one basket are displaced in the vertical direction by at least the thickness of one reinforcement iron and in the usual way can be connected via the cross. It is necessary to insert the support elements that may be integrated in the concrete slab in the vertically reverse direction and shifted height at the part of the shuttering baskets intended for turning, so that they take the correct position when the corner slabs are turned over.

The shuttering baskets according to the invention are manufactured in sizes that allow easy manipulation on the construction site by weight. The height of a concrete slab corresponds to the thickness of the ceiling to be cast; the width of an element can e.g. choose according to the usual modules that can be used in construction. By dressing the faceplate using a cutting disc, slab formwork of any size can be constructed without any particular difficulty.

The essence of the invention and its use is illustrated by the following FIGS. 1 to 5,

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CH 685 442 A5

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however, the examples shown are not intended to limit the possible embodiments of the invention in any way.

Fig. 1 shows a formwork basket according to the present invention in a vertical section. A series of parallel U-shaped reinforcing bars are fastened to the end plate (1), each protruding horizontally from an upper (2) and a lower leg (3) into the space to be filled with concrete. The two legs are connected by the vertical center piece (4), which is attached to the face plate. The insert (5) in the end plate with the mounting iron (6) is used to insert brackets (see Fig. 2) for fastening a protective wall. The legs (2) and (3) serve to lay and fasten the transverse reinforcement bars (7).

In Fig. 2, a shuttering basket according to Fig. (1) is shown in vertical section, as it on an existing outer wall from the bricks

(10) and the horizontal support formwork (8) is fully assembled, ready for concreting the ceiling. With

(11) are elements used in the existing outer wall, which are intended for inserting the brackets (12) for the brackets (13) for a protective wall (14). This protective wall serves to protect the mason against falling and can be raised in stages with the help of the brackets (12) when the outer wall is further bricked up over the concrete ceiling. The inserts (5) in the end plate of the formwork element, which are provided with extensions (6), which ensure fastening in the cast concrete ceiling, serve to use additional brackets to support the protective wall (14).

3 shows a perspective view of two shuttering baskets according to the invention, which are joined to form a corner. The reinforcement legs (2) and (3) are inserted asymmetrically in the end plate (1), so that by turning the end plate (1 ') the legs (2') and (3 ') relative to the legs (2) and (3 ) are shifted in height. In addition, the mounting elements (5) for the brackets are used in the opposite position in this plate.

Fig. 4 shows the conventional state of the art for the treatment of the edge parts when glazing reinforced concrete ceilings: A seen in perspective from above, B in vertical section: the vertical formwork board (15) is struck (16) against the lower wall ( 18) pressed, the struts are held by the screws (17) on the wall. (15) forms the outer formwork for the edge of the ceiling to be cast, which is held from below by the support formwork (8). The latter in turn is held in its horizontal position by the horizontal struts (19) and by floor supports which are not visible in the figure.

Fig. 5 shows a commercially available tool for formwork of the edge parts of reinforced concrete ceilings: A seen in perspective from above and B in a section through the finished cast ceiling with the adjacent outer wall. The stimulus plate (20) made of an insulating material, e.g. Stone wool carries parallel steel brackets (21) at regular intervals, which are attached to the lower formwork (8) by means of spacers (23). These angles are held on the end plate (20) by the fixing screws (22). (18) is the lower part of the outer wall on which the reinforced ceiling is supported; Section B also shows the upper continuation of the outer wall (24), which is created after the reinforced ceiling has hardened. The end plate (20) made of insulating material remains in place after the formwork has been removed, as has the steel bracket (21) with its fixation (22). The outer walls (18) and (24) are also covered with insulating plates in the construction shown; however, as can be seen from section B, the insulation layer in the area of the concrete ceiling is thicker and is partially supported on the edge of the outer wall (18). This takes into account the lower insulation capacity of the concrete compared to the brick wall.

The entire construction method shown in FIG. 5 is therefore only suitable for buildings with external insulation. It is more complex than the construction according to the present invention, since parts which only serve to fix the insulating end plates remain in the finished cast ceiling.

Claims (5)

Claims 1. formwork basket for the formwork of the edge zones of reinforced concrete ceilings, consisting of an end plate (1) and a series of U-shaped reinforcement bars (2) fastened to it at regular intervals, characterized in that the end plate consists of non-reinforced concrete, and that the U-shaped reinforcing bars are anchored to the end plate with their short connecting piece (4) and protrude vertically from the end plate with their two longer legs (2, 3) in such a way that the short connecting pieces of the U-shaped ones are attached to the formwork basket laid on site Reinforcing irons next to each other vertically, and the longer, perpendicular legs are arranged horizontally one above the other in the plane of the reinforced ceiling (8) to be created. 2. Formwork basket according to claim 1, characterized in that the legs (2, 3) of the reinforcing bars projecting perpendicularly from the end plate (1) are at a different distance from the upper or lower edge of the end plate, the difference in the distances being at least one thickness Reinforcing iron corresponds. 3. shuttering basket according to claims 1 and 2, characterized in that in the end plate (1) holding elements (5) for the insertion of consoles (13) are cast in at regular intervals. 4. shuttering basket according to claim 3, modified for use in a vertically inverted position, characterized in that the holding elements (5) for inserting the brackets are cast in a position rotated by 180 ° in the end plate. 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 3rd 5. shuttering basket according to one of claims 1 to 4, characterized in that the height of the end plate corresponds to the thickness of the ceiling to be manufactured, and that its length is selected such that the shuttering basket has such a weight that it can be used by human without special aids Force can be manipulated. 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 4th 5 CH 685 442 A5