DEG0014910MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: July 16, 1954 Announced on July 5, 1956

GERMAN PATENT OFFICE

It is known within the formwork wall of a tensioning track for the production of partial beams made of reinforced or prestressed concrete push bars, which are used to bond the partial beam with the in-situ concrete, to be arranged so that they completely or partially encompass the reinforcement elements and their free ends extend in the direction of the tensioning path.

T-shaped concrete beams with push bars have previously been manufactured, for example, by that the push bar encompassing the reinforcement layers was arranged in the formwork in such a way that that their ends protruded upwards. There are no concerns about such a production, when the concrete is compacted by shaking the formwork on the side. The compression However, in this case the concrete is not sufficient for prestressed concrete. To better compact the concrete To be able to do so, the entire formwork, including the entire formwork base, is vibrating offset and the push handle is only pressed into the concrete shortly after it has been compacted. A positive connection of the Push bar with the reinforcement elements is then not possible.

In order to avoid this disadvantage, the concrete beam was made in two stages, namely first the one. Half te of the beam, made, then the reinforcement elements with the push bars

609 548/320

G 14910 IVc / '80a

laid and the second half concreted on top. The push handle was between a two-part Formwork wall clamped so that its free ends extended in 'one' horizontal plane. This production of partial beams is uneconomical, Quite apart from the fact that they cannot be used with prestressed concrete.

Partial beams have already been manufactured in such a way that the concrete was placed in a trough-shaped formwork and the reinforcement elements comprehensive push handle were designed so that their free ends in the horizontal lying Openings provided in the base plate penetrated. This type of production had disadvantages: The Implementation points had to be sealed, for example by rubber rings, paper or the like; the push bars could only be bent at their ends after the partial beam had hardened; In addition, the stirrups get stuck in the openings in the bottom of the formwork, as the length increases of the partial beam when relaxing, reducing the risk of the partial beam tearing open consists.

These disadvantages are avoided if the partial beams are made of reinforced or prestressed concrete the main patent 938 329 manufactures. The distinguishing feature of the main patent is that the push handle are completely or partially encased by the concrete of the partial beam, in such a way that the Brackets are slightly exposed before the connection with the in-situ concrete and, if necessary, bent up be able. The partial beam has on the side facing the in-situ concrete to be added later or more ribs, and the push handle parts engage in this rib.

With regard to increasing the load-bearing capacity of reinforcement elements during assembly it is expedient to remove the ribs in which the means that transmit the thrust forces are accommodated, to be carried out relatively wide or higher than was previously the case. This leads to the fact that the Wholly or partially embedded in the concrete thrust transmission means on the construction site more difficult can be detached and bent up.

The invention is based on this disadvantage. turn off.

According to the invention, it is proposed that the tensioning track at the point where the push handle comes from the partial beam to be produced protrude deeper than the cross-sectional shape of the partial beam on this Place corresponds to design and fill this space with sand or the like and from the

Part of the bar protruding push handle parts in the ■

Sand or the like to be enclosed.

The concept of the invention is illustrated schematically with reference to the drawings. It shows

Fig. Ι a section through one with a rib or a bar provided with partial beams in its formwork,

Fig. 2 is a section through a partial beam with a rectangular cross-section in its formwork.

The formwork bed 1 has a recess 2 which is filled with sand 3 up to a selectable height is filled out. After tensioning the reinforcement layers 4, which may be pre-tensioned can be, the bracket 5 are inserted into the formwork space, for example so that part of its ends come to rest between the two reinforcement layers, while the other ends rest on the bottom of the formwork. These ends therefore engage in the recess 2 introduced sand. Now the concrete is poured into the formwork space, from above compacted and the partial beam lifted out of the formwork after the concrete had hardened. the Push bars are then already exposed as the sand falls off. The prerequisite is that the Concrete has an earth-moist consistency so that it does not combine with the poured sand. . Of course, the idea of the invention can also be used when the cross-section the partial bar is rectangular, as can be seen from FIG.

Claims (1)

PATENT CLAIM: Formwork for the production of partial beams made of reinforced or prestressed concrete with push bars for bonding with in-situ concrete, the free ends of which are in the direction when the partial beam is produced extend to the tensioning track, in particular for the production of partial beams after Patent 938 329, characterized in that the tensioning track at the point where the Push handle protrude from the partial beam to be manufactured, is deeper than it corresponds to the cross-sectional shape of the finished partial beam, and this space is filled with sand or the like and the later protruding from the partial beam Enclose push handle parts in the sand or the like. Considered publications:
German patent specification No. 573 695. 1 sheet of drawings © 609 548/300 6.56