EP0436859A2 - Shuttering for making prestressed concrete sleepers with immediate anchoring - Google Patents

Shuttering for making prestressed concrete sleepers with immediate anchoring Download PDF

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Publication number
EP0436859A2
EP0436859A2 EP90123890A EP90123890A EP0436859A2 EP 0436859 A2 EP0436859 A2 EP 0436859A2 EP 90123890 A EP90123890 A EP 90123890A EP 90123890 A EP90123890 A EP 90123890A EP 0436859 A2 EP0436859 A2 EP 0436859A2
Authority
EP
European Patent Office
Prior art keywords
anchor plate
formwork
wire
threshold
tensioning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90123890A
Other languages
German (de)
French (fr)
Other versions
EP0436859A3 (en
Inventor
Frithjof Dipl.-Ing. Schimpff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wayss and Freytag AG
Original Assignee
Wayss and Freytag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE4000729 priority Critical
Priority to DE4000729 priority
Application filed by Wayss and Freytag AG filed Critical Wayss and Freytag AG
Publication of EP0436859A2 publication Critical patent/EP0436859A2/en
Publication of EP0436859A3 publication Critical patent/EP0436859A3/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/06Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed for the production of elongated articles

Abstract

In order to be able to carry out the arrangement of ribbed tensioning wires (5), which are anchored in the concrete by adhesive bonding, in a prestressed concrete sleeper independently of the space requirement of the drawing heads of the tensioning devices, it is proposed to anchor the tensioning wires (5) temporarily in an anchoring plate (2) and, by suitable design, to make the anchor plate releasable and recoverable. …<IMAGE>…

Description

  • The invention relates to a formwork for producing prestressed concrete sleepers with an immediate bond, as described in the preamble of claim 1.
  • There are various methods for producing prestressed concrete sleepers. A simple method of manufacture is that in a long fitted bed, as is common for turnout sleepers, for example. Numerous railway operating companies, however, require a threshold with a cross section which is adapted to the course of the forces and is variable over the length of the threshold. Such a threshold - because it requires a high degree of dimensional accuracy - can only be produced economically in the long fitted bed with great effort and for numerous types of thresholds. Thresholds with a complicated shape are therefore manufactured in individual formwork or in batteries of individual formwork. When it comes to producing sleepers in individual formwork, there is again two fundamentally different manufacturing processes:
    • - with subsequent joining in light, inexpensive formwork; it is subsequently pre-stressed against the hardened concrete of the deactivated threshold with the disadvantage of subsequent threading and subsequent tensioning and the need for pressing,
    • - With immediate bond, the tensioning wires being tensioned against the formwork, which is much heavier and more complex, before the concrete is placed; the concrete threshold must remain in the expensive formwork for longer and requires high investments in a large number of rotating formwork sets.
  • According to the introduced manufacturing method A of the applicant in DE-GM 18 33 644 it is known to prestress prestressed concrete sleepers with ribbed tension wires and immediate bond by tensioning and anchoring ribbed tension wires against the end walls of the formwork with multiple presses in one operation. The prestressing force is introduced after the concrete has hardened by loosening the prestressing wire anchor in the end walls of the formwork by means of an adhesive bond from the prestressing wires into the threshold concrete.
    According to DE-GM 17 44 448, another manufacturing process B for prestressed concrete sleepers with an immediate bond is known, in which the prestressing forces are made of smooth tension wires are introduced into the threshold concrete by lost anchor plates on the end faces of the sleepers. The lost anchor plates each anchor, for example, two or four rods and have on their side facing away from the threshold means for connecting to tension rods, to which a clamping press can be attached. The smooth tension wires are cut to the desired length, passed through bores in the anchor plate with a slightly larger diameter than that of the rod cross-section, and then provided at their ends with swaged heads that anchor the tension wires in the anchor plate. The bundle of tensioning wires with anchor plates prepared in this way is installed in the sleeper formwork and prestressed against the end faces of the formwork. Then concrete is poured into the formwork and after it has hardened sufficiently, the anchors are loosened and the tension rods are unscrewed from the anchor plate and removed. This transfers the pre-tension from the tension wires to the concrete of the sleeper via the anchor plates. The threshold can be lifted out of the formwork. The anchor plates are lost.
  • According to the former production method A, it is only possible to pretension a limited number of tension wires. With the help of space-consuming constructions deeply recessed into the front wall of the formwork, the points of attack for the drawing heads at the rod ends are relocated in front of the level of the formwork into the concrete of the sleeper, so that the sleeper is unimpeded after the concrete has hardened and the pulling heads removed from the threshold tension wire ends protruding into the formwork can be lifted out of the formwork. These sinking constructions do not allow the use of conventional bundle presses. The pulling head to be attached to each individual tension wire has a minimum size, which requires a corresponding minimum distance to the next pulling head. This minimum distance corresponds to a maximum number of tension wires assigned to the predetermined end face of the threshold, which can be arranged on this end face.
  • Manufacturing method B uses smooth reinforcement bars and therefore cannot apply the prestressing forces to the threshold concrete via composite. The tension wire anchors become part of the threshold and are therefore lost. However, since the anchor plates represent a not inconsiderable cost factor, the loss of the anchor plates means that sleeper production becomes more expensive. In manufacturing method B, the wire heads must also be pushed onto the bars mounted in the reinforcement cage for at least one anchoring side, which represents a considerable hindrance to this operation.
  • Changing demands on the types of sleepers set the task, using the state of the art, as it results from manufacturing process B, to further develop manufacturing process A in such a way that one manufactured according to process A on the constant end face Threshold accommodates a larger number of tension wires and can be pre-tensioned with a simple and economical tensioning method.
  • The object is achieved by the formwork described in the characterizing part of claim 1. In order to be able to install any statically required number of tension wires in the sleeper, the tension wires are temporarily anchored in an anchor plate, which - as is known from manufacturing process B - has means for fastening a tension rod to which the Clamping press can be used. The anchor plate enables the arrangement of practically any number of tensioning wires in the sleeper and their simultaneous prestressing with a press in one operation, without the need for a pulling head which requires space at each tensioning wire end. The anchor plate is recovered in order to economically exploit the property of the ribbed tensioning wire in introducing its tension into the threshold concrete via adhesive bond.
  • The subclaims relate to configurations of the formwork by means of different designs of the anchor plate forming part of the end formwork, which allow the anchor plates to be recovered after the concrete of the threshold has sufficiently hardened and after the tension member for the tensioning press has been released from the anchor plate. Here the anchoring devices in the formwork according to claims 6 to 14 additionally solve the task of being able to emerge the wire heads on both tension wire ends independently of the anchoring in the anchor plate and of the assembly of the tensioning bundle. This significantly simplifies the upsetting process and the assembly of the tension bundle in the formwork. At the same time, the tension wire anchors for the recovery of the anchor plates can be released non-destructively in these devices. In claims 2 to 5 designs of the anchor plates are given, which allow easy attachment of known tools for separating the wire heads of the anchor, so as to recover the anchor plate. Claims 2, 3 and 5 provide cutting tools that cut the tension wire perpendicular to the wire axis; According to claim 4, the wire head is removed by tools acting in the wire axis for metal removal - such as drilling or milling machines - but also devices for blasting off the clamping heads by sudden heating with an electric arc.
  • The claims 15 to 20 specify expedient shapes of the anchor plate, which should facilitate the removal of the threshold and the recovery of the anchor plate.
  • The invention is illustrated by exemplary embodiments in FIGS. 1 to 21. Show it:
  • 1 to 2
    a formwork with a prestressing device according to the invention; 1 is a vertical longitudinal section, FIG. 2 is a cross section,
    Fig. 3
    the anchoring of a tension wire by an upset wire head in the anchor plate,
    Fig. 4.1 / 2
    a horizontally placed longitudinal section through a deactivated threshold with a pretensioning device according to the invention,
    4.1 with intermediate layer 9 according to claim 3,
    4.2 with layer 10 according to claim 5,
    Fig. 5
    An anchoring device according to claim 4, on which means for machining the wire heads can be attached,
    Fig. 6
    an anchoring device according to claim 2,
    Fig. 7
    an anchoring device according to claim 4, to which means for detaching the wire heads can be attached,
    Fig. 8
    the view against an anchor plate according to claim 6,
    Fig. 9
    the view against an anchor plate according to claim 7,
    Fig. 10 + 11
    Anchoring device according to claims 8 and 17, Fig. 10 view, Fig. 11 section in the tension wire axis,
    Fig. 12 + 13
    Anchoring device according to claims 10 and 12, Fig. 12 section in the tension wire axis, Fig. 13 view, looking in the tension wire axis,
    Fig. 14
    Section through an anchoring device according to claim 16 in the tension wire axis,
    Figures 15 + 16
    Two examples of an anchoring device according to claim 11. Cuts in the tension wire axis.
    Fig. 17
    View of an anchor plate according to claim 18,
    Fig. 18
    horizontal section through an anchor plate according to claim 19,
    Fig. 19 + 20
    Sections through an anchor plate according to claim 13; 19 horizontal section, FIG. 20 vertical section tangent to the pipe 41,
    Fig. 21
    Section through a tension wire anchor according to claim 14.
  • 1 shows a formwork 1 for the production of prestressed concrete sleepers, in which the tension wires 5 are inserted ready for prestressing with an anchoring device according to the invention. The anchoring device comprises the anchor plate 2 with bushings 3 for the tensioning wires 5. The tie rod 4 is detachably connected to the anchor plate 2. It can be connected to it via a bore 40 arranged in the center of gravity of the tensioning wires 5, for example by means of a threaded connection. The tensioning wires 5 are anchored on the side of the anchor plate 2 facing away from the threshold 7 by upset wire heads 6. An intermediate layer 9 with reduced strength or a flexible layer 10 can be arranged between the anchor plate 2 and the end face 8 of the threshold 7. The intermediate layer 9 is intended to reduce the cutting effort when severing the wire heads according to claim 4. Due to the flexibility of the layer 10, the anchor plate 2 can be pressed against the end face 8 of the threshold 7. The resulting gap 11 between the anchor plate 2 and the wire head makes a method according to claim 5 or a device according to claim 10 applicable.
  • Figures 5 to 7 show examples of anchor plate designs with which the wire heads 6 of the tensioning wires 5 separated and the anchor plates 2 detached from the threshold 7 and recovered. The anchor plates 2.1, 2.2 used there are at the same time examples with clamping heads 6 which are sunk on the side 12 of the anchor plate 2 facing away from the sill 7. FIG. 5 shows a milling cutter with which the wire heads 6 are milled. In the example according to FIG. 6, tools 14 that are moved in slots 13 of an anchor plate 2.2 separate the wire heads 6. In the example according to FIG. 7, the wire heads 6 are blasted off by sudden heating with an arc 15.
  • FIGS. 8 to 16 show examples of anchor plates in which the tension wire anchorings can be detached from the threshold without being destroyed. The anchor plate 2.3 according to FIG. 8 has keyhole-shaped feedthroughs 16, consisting of a bore 17 and a slot 18 that widens the bore 17 in one direction. The diameter of the bore 17 is slightly larger than the diameter of the wire head 6, the width of the slot 18 is slightly wider than the thickness of the tension wire 5. The centers of the bores 17 and the axes of the slots 18 have at least one circle 19 around as a common geometric location the common pivot point 20. The prestressing reinforcement is preassembled by inserting the wire heads 6 through the bores 17 and pushing the shafts of the tensioning wires 5 into the slots 18. When the tensioning wires 5 are tensioned after the tensioning reinforcement has been installed in the formwork, the wire heads 6 rest on the edges of the slots 18 and anchor the tension wires 5. After striking the concrete threshold, pressing the plate - for example if an elastic layer 10 is provided - loosens the contact pressure of the wire heads 6 in the slots 18, and the plate can be rotated and released in the direction of the arrow. Correspondingly, the wire heads 6 are anchored in the anchor plate 2.4 according to FIG. 9 and, after stripping the threshold, are loosened again by pushing the shafts of the tension wires 5 into the slots 18, 21 by pressing down the anchor plate 2.4 and moving them upward.
  • Instead of an anchor plate with keyhole-shaped bushings 16, according to FIGS. 10 and 11, anchor plates 2.5 with bores 22 which are round in cross section and have a diameter slightly larger than the diameter of the wire head 6, and fork-shaped disks 23 provided with a slot 24 for anchoring the tension wires 5 to be used. The slot 24 of the disk 23 encompasses the shaft of the tensioning wire 5 behind the wire head 6. To loosen the anchor plates 2.5, the disks 23 are pulled off the wire shafts. FIG. 11 also shows the example of a bushing 3.4 with bushing 3.4 that widens conically on the threshold side to a larger part 27 of the plate thickness.
  • In the anchor plate 2.6 according to FIGS. 12 and 13, the tension wires 5 are by conical anchoring parts 25, which are self-locking around their shaft. If the wire head 6 is relieved by pressing the anchor plate 2.6 against a resilient layer 10, springs 39 press the anchoring parts 25 apart and the anchor plate 2.6 can be pulled off over the wire heads.
  • It is advantageous that the tension wire 5 protrudes as little as possible from the end face 8 of the finished sleeper 7 after the anchor plate 2 has been released. This is achieved by countersinking the wire heads 6 on the side of the anchor plate facing away from the threshold 7. Sufficiently, this is done in the anchor plate 2.1, for example in FIGS. 5 and 7, where the wire heads 6 have to be removed to release the anchor plate. In the case of non-destructive loosening of the anchor plates, an even deeper depression of the wire head 6 is expedient in order to make the wire head 6 also disappear in the plane of the end face 8 of the threshold 7. This is achieved with anchor plates 2.7 according to FIG. 14 which have templates 26 on the bushings 3.3 on the side facing the concrete. By means of the template 26, the shoulder for the clamping head anchoring can be sunk in the implementation 3.3 beyond the thickness of the anchor plate 2.7.
  • In the examples of anchoring devices according to claim 11, shown in Figures 15 and 16 a bushing 28.1 or 28.2 is provided in the anchor plate 2.8 or 2.9 for each tensioning wire 5, the lower section 29.1 or 29.2 facing the threshold 7 has a clear diameter which is slightly larger than the outer diameter of the wire head 6, and whose outer section 30.1 or 30.2 facing away from the threshold 7 is considerably widened to accommodate multi-part wire head anchorings 31.1 or 31.2 and is provided with an internal thread 32.1 or 32.2. The wire head anchoring 31.1 or 31.2 comprises the chuck 36.1 or 36.2 consisting of several segments, which rests on the shoulder 33.1 or 33.2 formed by the cross-sectional jump of the bushing 28.1 or 28..2 and the packer 34.1 or 34.2. The packer 34.1 or 34.2 has an external diameter and an external thread which corresponds to the internal diameter and internal thread of the outer section 30.1 or 30.2 of the bushing 28.1 or 28.2. Its head 35.1 or 35.2 corresponds to the shape of the chuck 36.1 or 36.2. To anchor the tensioning wire, the chuck 36.1 or 36.2 is pressed firmly against the shaft of the tensioning wire 5 inserted through the lower section 29.1 or 29.2 of the leadthrough 28.1 or 28.2 immediately behind the wire head 6 by screwing in the packer 34.1 or 34.2. By unscrewing the packer 34.1 or 34.2, the tension wire anchoring and thus the anchor plate 2.8 or 2.9 can be released again.
  • One for lifting the threshold out of the formwork The anchor plate 2.10 shows a suitable trapezoidal shape in the view according to FIG. 17. The tapering of the anchor plate 2.11 in the cross section according to FIG. 18, which is proposed in cross section after the side 38 facing away from the end face 8 of the threshold 7, serves to compensate for a possibly obstructing inclined position of the anchor plate when Clamping process.
  • An anchor plate 2.12 according to claim 13 with a conical template 26 is provided with holes 40 perpendicular to the tension wire axis. Tubes 41 are rotatably arranged in the bores 40, for example by means of a key which engages in an Allen key 44 at their upper end. Each tube 41 has an opening 42 at the level of the section with a tensioning wire axis, with an adjoining slot 43 extending perpendicular to the axis of rotation of the tube 41 on the tube jacket. The wire head 6 of the tension wire 5 is pushed into the interior of the tube 41 through a bore 39 arranged in the axis of the tension wire 5 and the approximately 42 opening lying behind it, and by rotating the tube so that the slot 43 is in front of the wire head 6 slides over the shaft of the tensioning wire, anchored in the anchor plate 2.12.
  • The anchor plate 2.12 in FIG. 21 offers a further variant for anchoring. The tension wire 5.1 is provided with a threaded head 45 which anchors by means of a threaded spindle 46 which rests in a conical passage 3.2 corresponding to the shape of the spindle. The threaded spindle 46 has means 47, by means of which it can be screwed onto the threaded head 45.

Claims (19)

  1. Formwork for the production of prestressed concrete sleepers (7) with immediate connection in closed individual formwork consisting of floor, side and end walls, in which, in the final state, floating wires (5), which are floating in the tie and provided with the connection with the concrete-increasing agents, by means of the outside the end wall (1.1) of the formwork (1) supporting prestressing can be prestressed and anchored in the end wall (1.1) of the formwork (1) and from which the threshold (7) after hardening of the concrete and after loosening the tension wire anchoring directly from the formwork ( 1) can be excavated, characterized in that
    - That in the formwork (1) in the longitudinal axis movable anchor plates (2) as part of the front formwork of the threshold (7) in or in front of the end walls (1.1) are arranged, in which the tension wires (5) temporarily up to Hardening of the concrete can be anchored and pre-stressed by means of the tie rods (4) penetrating the end walls (1.1) and detachably connected to the anchor plates at the rear, and
    - That the anchor plate (2) has devices by means of which the anchorages of the tie rods (5) can be released after the concrete has hardened and the anchor plates (2) can be recovered after the tie rods (4) have been released.
  2. Formwork according to claim 1 , characterized by an anchor plate (2.2) with slots (13) or channels running perpendicular to the axis of the tensioning wires (5), in which known tools (14) for mechanically severing the tensioning wires (5) - for example by shearing or metal removal - are movable.
  3. Formwork according to claim 1, characterized in that an intermediate layer (9) of low strength is arranged between the anchor plate (2) and the end face (8) of the threshold (7) on the side of the anchor plate (2) facing the concrete, in which the wire heads ( 6) can be separated from the tensioning wires (5) by means known per se - for example by cutting or sawing.
  4. Formwork according to claim 1, characterized in that the anchor plate (2.1) has recesses in the tensioning wire axis by means of the tools which act on the wire heads (6) in front of the anchor plate (2.1) for separating the wire heads.
  5. Formwork according to claim 1, characterized in that a resilient layer (10) is arranged between the anchor plate (2) and the end face (8) of the threshold (7) on the anchor plate (2), which is compressible in such a way that the tensioning wires (5) in the space (11) created by the pressing between the anchor plate (2) and the wire head (6) can be separated by means known per se or detachable or more easily detachable according to one of claims 6 to 14.
  6. Formwork according to claim 1, characterized in
    - That the anchor plate (2.3) has closable or releasable anchors in the form of keyhole-shaped bushings (16) for the tensioning wires (15) by rotation in opposite directions of rotation,
    - That these bushings (16) from a bore (17), the diameter of which is slightly larger than the diameter of the wire heads (6) which are upset on the tensioning wires (5), and from a bore widening Slot (18), the width of which is slightly greater than the thickness of the tensioning wire (5), all the bushings (16) with their longitudinal axes being arranged on concentric circles (19) around the pivot point (20) of the anchor plate (2.3) and the slots (18) extend with their axis unidirectionally on the respective concentric circle (19).
  7. Formwork according to claim 1, characterized in that the anchor plate (2.4) has anchors which can be released by shifting the axis in the form of keyhole and / or simply slot-shaped bushings (16 or 21), the keyhole bushings (16) consisting of a bore (17), the diameter of which is slightly larger than the diameter of the wire heads (6) which are pushed up on the tensioning wires (5), and of a slot (18) which widens the bore (17) and whose width is slightly greater than the thickness of the tensioning wire (5) , and that the axes of all bushings (16, 21) are directed parallel to one another and in one direction, and that the anchor plate (2.4) can be placed over the shafts of the tensioning wires (5) and by displacement in the axis of the bushings (16, 21) Anchoring between the edges of the slots of the bushings (16, 21) or to move out of the slots is movable.
  8. Formwork according to claim 1, characterized in that the anchor plate (2.5) has openings (22) as passages of the tensioning wires (5), the diameter of which is slightly larger than the outside diameter of the wire heads (6) and slotted disks (23) for anchoring the tensioning wires. has, the slot width (24) is slightly wider than the wire thickness and less than the diameter of the wire heads.
  9. Formwork according to claim 8, characterized in that a plurality of fork-shaped slotted anchoring disks form a unit which can be removed from the shafts of the wires by rotation or displacement.
  10. Formwork according to claim 1, characterized in that a flexible layer (10) is arranged between the anchor plate (2.6) and the end face (8) of the threshold (7), that the anchor plate (2.6) has conical passages (3.1) for the tensioning wires (5) , in which in the outer contour conical anchoring parts (25), which are supported against the anchor plate and grip the shaft of a tension wire (5) between the wire head (6) and anchor plate, can be used self-locking around the shaft of the tension wire (5) and by pressing the Anchor plate (2.6) against the flexible layer (10) are detachable.
  11. Formwork according to claim 1, characterized in
    - That in the anchor plate (2.8, 2.9) for each tension wire (5) a bushing (28) is provided, the lower, the threshold (7) facing section (29) has a clear diameter that is slightly larger than the outer diameter of the wire head (6), and the outer section (30) facing away from the threshold (7) for receiving the wire head anchor (31) is considerably widened and provided with an internal thread (32),
    - That the device has a chuck (36) from at least two segments, which grips the tensioning wire (5) immediately in front of the wire head (6), the wire head (6) serves as an abutment and a support on the through the cross-sectional jump in the implementation (28) formed shoulder (33),
    - That it has a with an internal thread (32) of the outer portion of the passage (28) corresponding external thread packer (34) with a shape of the chuck (36) correspondingly shaped head (35), and
    - That the segments of the chuck (36) by screwing the packer (34) in the outer portion (30) of the implementation (28) compressible and Unscrew the packer (34) again.
  12. Formwork according to claim 10 or 11, characterized in that spreading springs (39) are arranged between the segments of the chuck (25, 36).
  13. Formwork according to claim 1, characterized in
    - That the anchor plate (2.12) as bushings for the tensioning wires (5) has bores (39), the diameter of which is slightly larger than the outside diameter of the wire heads (6),
    - That perpendicular to the axis of the bores (39) and at the end of tubes (41) are arranged in bores (40) which have at one end means (44) with which they are rotatable about the axis of the bore (40),
    - That the tubes (41) in the axes of the bores (39) have openings (42) with the same diameter as the bore (39) and
    - That perpendicular to the axis of the tubes (41) starting from the openings (42), slots (43) which are slightly wider than the diameter of the tensioning wires (5), extend on the tube jacket, in which the tensioning wires (5) after Pushing the wire heads (6) through the opening (42) and after an appropriate rotation and the tube (41) can be anchored.
  14. Formwork according to claim 1, characterized in that the anchor plate (2.13) has passages (3.2) in which screw spindles (46) can be inserted from the side facing away from the sleeper (7), into the tensioning wires (5) provided with rod end threads (45). can be screwed in.
  15. Formwork according to one of Claims 1 to 14, characterized in that the wire heads (6) are countersunk in the anchor plate (2.1) on the side facing away from the end face (8) of the threshold (7).
  16. Formwork according to one of claims 1, 2, 4 to 15, characterized in that the anchor plate (2.7) - expediently conical in cross-section - has templates (26) around the leadthroughs (3.3) for the tensioning wires (5) that the wire heads ( 6) are anchored in the templates (26) on the face (8) of the threshold (7) facing away from the anchor plate (2.7) so that they are approximately in the plane of the face (8) of the threshold (7) their outer Have limitation.
  17. Formwork according to one of claims 1 to 16, characterized in that the bushings (3.4) for the tensioning wires (5) in the anchor plate (2) on the sleeper side at least on one larger part (27) of the plate thickness expand conically.
  18. Formwork according to one of claims 1 to 17, characterized in that the anchor plate (2.10) has a trapezoidal shape in the view against the end face (8) of the threshold (7) of a width which decreases downwards.
  19. Formwork according to one of claims 1 to 18, characterized in that the anchor plate (2.11) in horizontal section at its outer edges (37) to approximately three-fourths of the thickness of the cross-section to the side (38) facing away from the end face (8) of the threshold (7) ) tapers slightly.
EP19900123890 1990-01-12 1990-12-12 Shuttering for making prestressed concrete sleepers with immediate anchoring Withdrawn EP0436859A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4000729 1990-01-12
DE4000729 1990-01-12

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EP0436859A2 true EP0436859A2 (en) 1991-07-17
EP0436859A3 EP0436859A3 (en) 1992-03-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203223A1 (en) * 1991-02-07 1992-08-13 Wayss & Freytag Ag Reinforcing rods for pre-stressed concrete sleepers - have oblique cross-pieces to receive tensioning nuts
EP1360397B2 (en) 2001-02-14 2009-11-11 Max Bögl Bauunternehmung GmbH &amp; Co. KG Method and pallet for the production of a precise pre-cast concrete piece

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
US5366672A (en) * 1993-03-18 1994-11-22 Erico International Corporation Method of forming concrete structures with a grout splice sleeve which has a threaded connection to a reinforcing bar
DE102012217823A1 (en) * 2012-09-28 2014-04-03 Harsco Infrastructure Services Gmbh Wall formwork with sealing system
JP6384959B2 (en) * 2015-03-11 2018-09-05 日本コンクリート工業株式会社 Concrete product manufacturing apparatus and method for manufacturing concrete product

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US5196209A (en) 1993-03-23
EP0436859A3 (en) 1992-03-04
ES2023104A4 (en) 1992-01-01

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