DE801407C - Anchoring structure of pre-stressed steel inserts in prestressed concrete bodies - Google Patents
Anchoring structure of pre-stressed steel inserts in prestressed concrete bodiesInfo
- Publication number
- DE801407C DE801407C DE1948P0008551 DEP0008551D DE801407C DE 801407 C DE801407 C DE 801407C DE 1948P0008551 DE1948P0008551 DE 1948P0008551 DE P0008551 D DEP0008551 D DE P0008551D DE 801407 C DE801407 C DE 801407C
- Authority
- DE
- Germany
- Prior art keywords
- prestressed concrete
- concrete bodies
- steel inserts
- anchoring structure
- stressed steel
- 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.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
- E04C5/125—Anchoring devices the tensile members are profiled to ensure the anchorage, e.g. when provided with screw-thread, bulges, corrugations
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Description
Bei manchen Spannbetonkörpern, insbesondere bei Fertigbauteilen, "vie z. B. bei Stahlbeton--schwellen, besteht die technisch wirtschaftliche Forderung, daß die Zugkraft der vorgespannten Stahleinlage auf eine möglichst kurze Strecke schon in ihrer ganzen Größe und mit dauernder Sicherheit auf den Betonkörper übertragen wird.With some prestressed concrete bodies, especially with prefabricated components, "vie z. B. in reinforced concrete sleepers, there is a technical and economic requirement that the tensile force of the prestressed steel core on the shortest possible distance already transferred to the concrete body in their full size and with permanent security will.
Glatte Drähte erfüllen bekanntlich diese Forderung nicht. Sie haben, vom Drahtende an gerechnet, eine ziemlich große Reibungslänge notwendig, bis die volle Spannkraft erreicht wird. Sie werden nach dem Trennen an den Enden des Spannbetonkörpers etwas hereingezogen, sie rutschen also durch, und dieser Vorgang geht im Laufe der Zeit, besonders beim Vorhandensein vibrierender Belastung, vermutlich weiter.As is known, smooth wires do not meet this requirement. They have, counting from the end of the wire, a fairly large friction length is necessary until the full clamping force is achieved. After separating, they are attached to the ends of the prestressed concrete body pulled in a little, so they slip through, and this process goes on in the course of the Time, especially if there is a vibrating load, presumably further.
Besondere Formgebung der Drähte, z. B. Verschraubung, Knotenansatz. Verdrillung zweier Drähte, bringen im Sinne der ofengenannten Forderung insofern eine Besserung, als zur Haftung 1>zw-. Reibung im Beton noch der Formwiderstand des Drahtes hinzukommt. Je dünner die Drähte, desto wirkungsvoller werden solche Maßnahmen.Special shape of the wires, e.g. B. Screw connection, node approach. Twisting two wires, bring in the sense of the oven-mentioned requirement in this respect an improvement than to liability 1> zw-. Friction in the concrete nor the form resistance of the wire is added. The thinner the wires, the more effective they become Measures.
Die Verwendung weniger und starker Stahleinlagen ist aus verschiedenen Gründen jedoch erw#iinscht. Hier kann wegen der großen Spannkräfte die Eingangsforderung nur erfüllt werden, wenn jede Stahleinlage besondere Anker, zusätzlich angebracht, erhält. Die nachstehend beschriebene Erfindung zielt darauf hin, die Verankerung nicht bloß konstruktiv sehr einfach zu gestalten, sondern auch ihre Anbringung mit den einfachsten Mitteln zu ermöglichen, und dies sogar zum Schluß erst, an den angespannten Stahleinlagen, kurz vor Einbringung des Betons.The use of fewer and stronger steel inserts is different However, reasons are desirable. Here, because of the great tension forces, the initial demand can only be met if each steel insert has special anchors attached, receives. The invention described below aims to provide anchoring not only to make it structurally very simple, but also to attach them to make the simplest means possible, and this even at the end, with the tense ones Steel inserts, just before the concrete is poured.
Bei dieser Verankerungskonstruktion müssen die mit einer hohen Vorspannung versehenen Stahleinlagen kleine Verformungen aufweisen (z.13. w-ie Abb. I zeigt), die für sich allein nicht genügen, als Formwiderstand gemeinsam mit der Haftung die großen Spannkräfte auf kurze Strecken auf den Beton zu übertragen, die jedoch so bemessen sind, daß sie einem als _1@iker wirkenden Gebilde eine sichere Aufkeilung gestatten.With this anchoring construction, they must have a high preload provided steel inserts show small deformations (e.g. 13, as shown in Fig. I), which on their own are not sufficient as form resistance together with adhesion to transfer the large tension forces to the concrete over short distances, which however are dimensioned in such a way that they provide a secure wedge to a structure acting as a _1 @ iker allow.
Die als Anker wirkenden Gebilde besitzen entweder ein genügend großes Loch und werden vorher auf die Stahleinlage (Draht oder Stab) aufgefädelt und verteilt und dann nach dem Spannen der Stahleinlage mit Hilfe kleiner Zusatzkeile an der richtigen Stelle befestigt (z. 13. wie Abh.2), oder sie werden mit ihren Öttnungen an der richtigen Stelle der vorgespannten Stahleinlage aufgesetzt und befestigt, was bei guter Paßarbeit ohne Zwischenschaltung eines oder mehrerer "Zusatzkeile erfolgen kann (z. 13. wie Abb. 3), sonst aber solche erfordert. Paßsitz kann auch erzeugt werden durch Federwirkung des Gebildes, wie es z. 13. Alb. 4 zeigt.The structures acting as anchors either have a sufficiently large one Hole and are previously threaded onto the steel core (wire or rod) and distributed and then after tensioning the steel insert with the help of small additional wedges on the fixed in the correct place (e.g. 13 as dep. 2), or they are attached with their openings placed and fastened in the correct place of the pre-stressed steel insert, what with good fitting work without the interposition of one or more "additional wedges" can be done (e.g. 13. as in Fig. 3), but otherwise required. A snug fit can also are generated by the spring action of the structure, as it is, for. 13. Alb. 4 shows.
Die Verformung der Stahleinlage kann "entweder bereits bei der Herstellung erfolgen, und zwar in periodischen Wiederholungen, oder aber auch dadurch, daß die eingespannte Stahleinlage an der richtigen Stelle vor Aufbringung des Ankers eine entsprechende Kaltverformung erhält.The deformation of the steel insert can "either already take place during manufacture take place, in periodic repetitions, or by the fact that the clamped steel insert in the right place before applying the anchor corresponding cold deformation receives.
Die richtige Stelle ist stets am Ende der Schwelle, unter Berücksichtigung des üblichen l3etonüberdeckungsmaßes.The right place is always at the end of the threshold, taking into account of the usual 13-clay coverage.
Bei der periodischen Wiederholung der Verformung wählt inan zweckmäßig einen möglichst kleinen Abstand (einige Zentimeter), um die Verankerung möglichst nahe an (las Ende rücken zu können. Auch das Anbringen mehrerer Anker hintereinander wird dadurch möglich.Inan selects expediently for the periodic repetition of the deformation the smallest possible distance (a few centimeters) around the anchorage as possible close to (to be able to move the end. Also the attachment of several anchors one behind the other thus becomes possible.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1948P0008551 DE801407C (en) | 1948-10-02 | 1948-10-02 | Anchoring structure of pre-stressed steel inserts in prestressed concrete bodies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1948P0008551 DE801407C (en) | 1948-10-02 | 1948-10-02 | Anchoring structure of pre-stressed steel inserts in prestressed concrete bodies |
Publications (1)
Publication Number | Publication Date |
---|---|
DE801407C true DE801407C (en) | 1951-01-04 |
Family
ID=577750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1948P0008551 Expired DE801407C (en) | 1948-10-02 | 1948-10-02 | Anchoring structure of pre-stressed steel inserts in prestressed concrete bodies |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE801407C (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1221423B (en) * | 1958-04-30 | 1966-07-21 | Romualdo Macchi | Device for prestressing and anchoring a bundle of steel wires for concrete components with a subsequent bond |
US3399502A (en) * | 1966-04-29 | 1968-09-03 | Prescon Corp | Flat bar stressing tendon |
FR2003663A1 (en) * | 1968-03-11 | 1969-11-14 | Brandestini Antonio | ANCHORING A STRANDED CABLE IN A PRE-STRESSED CONCRETE CONSTRUCTION |
EP0244758A2 (en) * | 1986-05-02 | 1987-11-11 | Sumitomo Electric Industries Limited | Steel bar for concrete constructions |
EP0338924A1 (en) * | 1988-04-20 | 1989-10-25 | Freyssinet International (Stup) | Cable anchoring devices |
-
1948
- 1948-10-02 DE DE1948P0008551 patent/DE801407C/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1221423B (en) * | 1958-04-30 | 1966-07-21 | Romualdo Macchi | Device for prestressing and anchoring a bundle of steel wires for concrete components with a subsequent bond |
US3399502A (en) * | 1966-04-29 | 1968-09-03 | Prescon Corp | Flat bar stressing tendon |
FR2003663A1 (en) * | 1968-03-11 | 1969-11-14 | Brandestini Antonio | ANCHORING A STRANDED CABLE IN A PRE-STRESSED CONCRETE CONSTRUCTION |
EP0244758A2 (en) * | 1986-05-02 | 1987-11-11 | Sumitomo Electric Industries Limited | Steel bar for concrete constructions |
EP0244758A3 (en) * | 1986-05-02 | 1988-02-24 | Sumitomo Electric Industries Limited | Steel bar for concrete constructions |
EP0338924A1 (en) * | 1988-04-20 | 1989-10-25 | Freyssinet International (Stup) | Cable anchoring devices |
FR2630481A1 (en) * | 1988-04-20 | 1989-10-27 | Freyssinet Int Stup | IMPROVEMENTS IN CABLE ANCHORING DEVICES |
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