METHOD OF PRODUCING A PLURALITY OF CONCRETE CAST ELEMENTS

Abstract

In a method for producing a plurality of concrete cast elements of prestressed concrete, in particular for producing of railway sleepers, in a long bed which is a multiple of the length of a concrete cast element, in which separating elements are installed in the long bed to define the length of each of the concrete cast elements to be casted, a first and a second separating element for defining the length of a concrete cast element together with a tensioning device with tensioning elements for tensioning the concrete cast element between the two separating elements are mounted in the long bed, whereupon the concrete cast element is cast between the two separating elements and is at least partially hardened in the long bed.

Claims

1. A method for production of a plurality of concrete cast elements of prestressed concrete in a long bed which is a multiple of a length of a concrete cast element, comprising installing separating elements in the long bed to define the length of each of the concrete cast elements to be cast, characterized in that a first separating element and a second separating element for defining the length of each concrete cast element together with a tensioning device with tensioning elements for tensioning said concrete cast element between the first and second separating elements are mounted in the long bed, whereupon each concrete cast element is cast between the first and second separating elements and is at least partially hardened in the long bed.

2. The method according to claim 1, characterized in that each concrete cast element is tensioned after partial hardening of the concrete while tensioning the tensioning elements.

3. The method according to claim 1, characterized in that the first and second separating elements are mounted by means of a screw connection to transverse metal sheets supported on side elements of the long bed.

4. The method according to claim 1, characterized in that the tensioning elements are guided in formwork sleeves in an area between abutments.

5. The method according to claim 4, characterized in that the tensioning elements are supported at a first end thereof on at least one abutment designed as a fixed anchor element.

6. The method according to claim 5, characterized in that the tensioning elements are each connected at a second end thereof to a tensioning sleeve.

7. The method according to claim 6, characterized in that the tensioning elements are partially tensioned before each concrete cast element is casted.

8. The method according to claim 1, characterized in that at least one abutment designed as a tensioning anchor element is cast into each concrete cast element in order to support tensioning nuts in the cast concrete element.

9. The method according to claim 1, characterized in that the first and second separating elements are removed before the final strength of the concrete is reached, the tensioning elements are partially tensioned, the concrete cast element is removed from the long bed and the tensioning elements are then tensioned to final tension.

10. The method according to claim 1, characterized in that the tensioning elements are tensioned before the concrete cast elements are casted.

11. A device for producing a plurality of concrete cast elements of prestressed concrete in a long bed which is a multiple of the length of a concrete cast element, the device comprising a first separating element and a second separating element with means for mounting the first and second separating elements in the long bed and a tensioning device with tensioning elements which is arranged between the first and second separating elements.

12. The device according to claim 11, characterized in that the means for mounting the first and second separating elements each comprise at least one screw for screwing into a corresponding thread of a transverse metal sheet supported on side elements of the long bed.

13. The device according to claim 11, characterized in that the tensioning elements are guided in formwork sleeves in an area between abutments.

14. The device according to claim 11, characterized in that the tensioning elements are supported at a first end thereof on at least one abutment designed as a fixed anchor element.

15. The device according to claim 14, characterized in that a tensioning sleeve is connected to a second end of each tensioning element and is supported on the second separating element.

16. The device according to claim 15, characterized in that the tensioning sleeves are designed to form a recess for attaching tensioning nuts to the second end of the tensioning elements after removal from the first and second separating elements.

17. The device according to claim 11, characterized in that at least one abutment designed as a tensioning anchor element is arranged in an area of the second separating element to support tensioning nuts.

18. The device according to claim 11, characterized in that at least one of the first and second separating elements has a negative shape for an end structure of a face on each concrete cast element.

19. The method according to claim 4, wherein the tensioning elements are tensioning wires.

20. The method according to claim 5, wherein the fixed anchor element is releasably connected to the first separating element by means of at least one tensioning screw.

21. The method according to claim 6, where the tensioning elements are screwed to the tensioning sleeve and wherein the tensioning sleeve is supported on the second separating element.

22. The method according to claim 7, wherein the tensioning force is less than 10 kN per tensioning element, and the tensioning is carried out by means of the tensioning sleeves.

23. The device according to claim 13, wherein the tensioning elements are tensioning wires.

24. The device according to claim 14, wherein the fixed anchor element is releasably connected to the first separating element by means of at least one tensioning screw.

Description

[0034] The invention is explained in more detail below with reference to an exemplary embodiment shown schematically in the drawing. Therein

[0035] FIG. 1 shows a perspective overall representation of the device according to the invention,

[0036] FIG. 2 shows a perspective detailed illustration of the first end region of the device according to the invention,

[0037] FIG. 3 shows a perspective detailed illustration of the second end region of the device according to the invention,

[0038] FIG. 4 shows a perspective detailed illustration of the second end region of the device according to the invention in an enlarged illustration,

[0039] FIG. 5 shows a perspective illustration of a separating element of the device according to the invention and

[0040] FIG. 6 shows a view with several devices according to the invention in a long bed.

[0041] In FIG. 1, a long bed is denoted by 1, wherein in FIG. 1 only a portion of such a long bed 1 is shown. In the long bed 1, a first separating element 2 and a second separating element 3 are fixed to side elements 1′ of the long bed 1 by means of a screw connection. A tensioning device 5 with tensioning elements 6 is fixed between the two separating elements 2 and 3. A bottom plate 4 delimits the long bed 1 downwards. Concrete can be poured into the casting space 7 in order to form a railway sleeper between the separating elements 2 and 3, into which the tensioning device 6 is cast.

[0042] In FIG. 2 it can be seen that the tensioning elements 6 are fixed on the first separating element 2 with the interposition of first fixed anchor elements or anchor plates 8 and further with the interposition of tensioning screws 9. The anchor plates 8 form a strong abutment in the concrete in order to be able to exert tension forces on the concrete.

[0043] In FIG. 3 it is shown that the tensioning elements 6 pass through tensioning anchor elements or anchor plates 10 with their second end regions and are screwed to tensioning sleeves 11 which are connected to the second separating element 3. The tensioning sleeves 11 fix the second end of the tensioning elements 6 during casting and, after they have been removed from the hardened concrete, simultaneously create a recess which enables a tensioning nut 12 to be screwed onto the second ends of the tensioning elements 6.

[0044] In FIG. 4, one of the tensioning elements is taken as an example to show a recess which was created after a tensioning sleeve 11 was removed from the mold. Furthermore, a tensioning nut 12 can be seen which has been screwed onto the second end of the tensioning element 6. If the anchor plate 10 is now embedded in the concrete casting, tightening the tensioning nut 12 results in the tension wire 6, which is guided in a shuttering sleeve 13, being pulled in the direction of the arrow 14, thereby exerting a tension force on the concrete casting.

[0045] FIG. 5 illustrates that the separating elements 2 or 3 can have a negative shape for an end structure such as, for example, a chamfer. This would not be possible if the separating elements of the present invention were not accessible on both sides, since such a structure cannot be demolded transversely to the axial direction.

[0046] Finally, FIG. 6 shows that the long bed 1 has a length which exceeds the length of a concrete casting by a multiple and that therefore a plurality of devices according to the invention can be arranged in a long bed 1 and a large number of railway sleepers can be produced.