FI59147C - INSTALLERINGS- OCH TRANSPORTHAOLLARE FOER PREFABRICERADE BETONGELEMENT - Google Patents

Description

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Patent- och regieterstyrelaen 'Ansakin utiajd och uttikriftun pubiicund 27.02.8l (32) (33) (31) hn ^ «« y utuolkuu »—Buglrd prlerltut 03.02.77

Federal Republic of Germany-Förbundsrepubliken

Germany (DE) P 2701 * 1 + 35-5 (71) Frimeda Metall- und Drahtvarenfabrik, Siegfried Fricker, D-7131 Wiemsheim, Federal Republic of Germany Förbundsrepubliken Germany (DE) (72) Siegfried Fricker, Wiemsheim, Federal Republic of Germany-Förbunds- The present invention relates to an installation and transport fastener for prefabricated concrete is subjected to stresses due to the coupling head or the traction members adhering to it, which fastener includes anchoring members, such as support arms projecting from the level of the fasteners and a visually observable coupling opening limited by in the recess of the fastener extending into the recess, the fastening bridge branching into a protrusion extending at least over its bottom, integral with the fastener, provided with a support surface supporting the clutch head transverse to the axis of the fastener during the installation step.

Such an anchor, known per se (Betonwerk + Fertigteil -Technik 42. Jahrgang Bau Verlag no. 12/1976, page 633), is also suitable for loading objects of plastic or metal, the coupling-side surface of which is equally sensitive to deformation or other damage. An important area of application is the erection of precast concrete parts, in particular the treatment of thin-walled concrete slabs, 2 59147 where there is a particular risk of cracking the concrete when first lifted after manufacture for loading, unloading or attaching to a building. Visual inspection of the uncontaminated coupling element of the anchor during the coupling event is not impeded. No special coupling pieces or coupling spacers are required to transmit the force. Material and manufacturing costs have not increased significantly.

The object of the present invention is to further develop such an anchor, i.e. a fastener, so that it is even more suitable for thin-walled ready-mixed concrete parts or other brittle loading objects.

This object is achieved according to the invention in that the projections interlock in a recess of the plate-shaped coupling head located between the receiving opening for the coupling head of the fastener and the central opening of the coupling head and that the fastener is loaded

Such a structure does not impair the conditions for rational and material-saving series production.

Other embodiments of the invention will become apparent from the subclaims.

An embodiment of the invention will now be described with reference to the accompanying drawings, in which:

Figure 1 shows a fastener molded into a prefabricated concrete element, which includes a coupling head. (Section I-I of Figure 2).

Figure 2 shows a section taken along the line II-II in Figure 1.

Fig. 3 shows a top view of the switch head according to Fig. 1.

Figure 4 shows an alternative embodiment of the fastener, with the coupling head according to Figure 1.

Fig. 5 shows a section taken along the line V-V in Fig. 4.

Fig. 6 shows a top view of the switch head according to Fig. 4.

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The mounting and transport bracket is a flat steel shaped piece with a rectangular cross section and a thickness of c. Its body is split along axis a-a. Its transverse arms 12c are bent outwards from the plane b-b of the fastener. Two holes 23 running relative to the plane b-b of the fastener are made for the stiffening rods. In addition, two opposite notches are made in the longitudinal edges 21 of the fastener to ensure the position of the bent stiffening rod 24a. These notches 25 are located between the holes 23 and the clutch hole 20 made in the clutch end of the fastener. The stiffening bars and transverse arms 12c, on the other hand, provide anchorage to the fastener cast in the prefabricated concrete element, which is also increased by very high tensile stresses extending transversely to the longitudinal axis a-a of the fastener. The fastener-side surface 11 extending longitudinally of the precast concrete element 10, planar with respect to the fastener and extending approximately perpendicular to its longitudinal axis a-a, does not protrude outwardly from the coupling end of the fastener 12 (Fig. 1-3) or does not protrude substantially (Figures 4-6). Namely, the coupling head 12a formed mainly by the fastening bridge 12d is located in the cap-like or slotted recess 18 of the precast concrete element 10. As a result, the gripping point of the coupling head is located inside the precast concrete element. In addition, the surfaces of the fastener which are susceptible to corrosion, i.e. the non-enclosed concrete, are substantially reduced. They are largely omitted when the recess, after the prefabricated concrete element has been incorporated into the building, is filled with concrete. In the coupling step, the coupling head 12a sinks so far into the slot 27 of the coupling head 16 (Figs. 3, 4) that the coupling opening is covered with the guide channel of the closing latch 13 inside the coupling head 16. The inspection switch opening 20 engages when the locking latch 13 is engaged.

The protrusion or protrusions 12e are approximately rectangular in cross-section, with the side length of the rectangle corresponding approximately to the thickness of the fastener.

In the example according to Figures 1-3, the fastening bridge 12d runs on both sides of the projections 12e projecting from the bottom 15 of the fastening bridge 12d. Both projections are provided with a support surface 14c facing the fastener axis a-a, on which the coupling head 16 rests during installation. The support surfaces 14c exceed an annular curved base 15 extending over the mounting bridge 12d. between the opening 19. When the fastener 12 as well as the mounting fastener is stressed (pull direction B), the support surface 14c rests on the wall 26a of the recess 26 located inside the cross-sectional surface of the coupling head 16. The distance a-ot between the planar support surfaces 14c running approximately parallel to the mounting shaft a-a is smaller than the thickness y of the plate-like coupling head. The planar wall 26a extends over the oblique surface 26b in the approximately planar wall 16a of the coupling head. Both recesses 26 terminate in front of the central opening 19 of the coupling head.

In the embodiment according to Figs. 4 to 6, the protrusion 12e on the fastening shaft a-a sinks in two central support recesses 2u of the coupling head with two mutually opposite support surfaces 14d. This recess is formed by a channel open on both sides, which extends from the slot 27 to the central opening 19 of the coupling head 16 and is rectangular in cross section. The inner width of the channel is slightly larger than the cross section of the recessed projection 12e. The second support surface 14d is located in the mounting position parallel to the wall of the duct running parallel to the longitudinal edge 21 of the fastener 12.

In both embodiments according to Figures 1-3 and 4-6, the longitudinal edges 21 of the fastener run parallel. These embodiments are particularly suitable for very thin-walled precast concrete elements due to the adhesion of the projections in the recesses of the coupling head, since the coupling head at the fastening bridge 12d forming the coupling head of the fastener 12 exceeds the fastening width only very little by the coupling head thickness y.

In all application examples, the point pressure stress of the prefabricated concrete element in the impermissible area of the sinking coupling head 16 in the recess 18 is avoided. This is largely achieved by a simple operation without incurring any additional costs. In addition, the fastener ensures that the transverse arms 12c are loosened and pulled out by the stiffening bars 24 when loaded in the pulling direction B, and that the stiffening bars have an inhibitory effect. In this case, the bent stiffening rod 24a is supported at point C (Fig. 1). Other stiffening bars are supported in the same direction. The transverse arms 12c are supported at C (Fig. 1) in the opposite direction.

Claims (10)

1. Installation and transport brackets for prefabricated concrete elements, whose surface facing the joint in certain pulling directions, which deviate substantially from the attachment shaft, are subjected to the load caused by the coupling head or at the gripping tension member, which bracket is provided with anchoring means, e.g. support legs protruding from the holder's piano and a visually controllable connector opening which Mr confined from the connector side of the holder bridge, and which holder bridge consists of a depression in the prefabricated wall of the holder, which extends over the holder's coupling head; extending, with the holder in one piece, a projection (12e), which is provided with a support surface (14) supporting the support surface (14) with the shaft (a - a) transverse, characterized in that the projection ( 12e) overlap each other in the recess (26 or 28) of the disc-shaped coupling head (16) which is located between the receiving opening (27) and the central opening (19) of the coupling head (12a) and the central opening (19) of the coupling head. is loaded in this axial direction deviating direction (pulling direction B), the supporting surface (14c, 14d) abuts against the cross-sectional surface of the coupling head (16). a recess wall (26 or 28). Installation and transport holder according to claim 1, characterized in that the distance (a-a) between the planar planes of the projections (12e), approximately parallel to the shaft (a-a) of the supporting surfaces (14c and 14d) is less than the thickness (y) of the disc-shaped coupling head (16). Installation and transport holder according to claim 1 or 2, characterized in that the long edges (21) of the holder (12) and supporting surfaces (14c and 14d) are parallel to one another. Installation and transport bracket according to any of claims 1-3, characterized in that two symmetrically aligned with the bracket shaft (a - a), with projections connected to the bracket's long edges (21), fall into the grooved recesses in the coupling head (16). terminates in the receiving opening (27) of the coupling head (16) (Figs. 1 - 3).