DE1659265B2

DE1659265B2 - Prestressed concrete wire strand

Info

Publication number: DE1659265B2
Application number: DE1659265A
Authority: DE
Inventors: Wilhelm 4700 Hamm Peters
Original assignee: Vereinigte Drahtindustrie Gmbh, 4700 Hamm
Priority date: 1967-10-04
Filing date: 1967-10-04
Publication date: 1974-02-14
Also published as: AT290085B; BE721723A; NL6814067A; NL148673B; DE1659265C3; DE1659265A1

Description

F j g. 3 einen Außenclraht in der Ansicht,
Fig. 4 einen Längsschnitt duich den Außenclraht der F i g. 3 nach der Linie IV-IV.F j g. 3 a view of an outer wire,
FIG. 4 shows a longitudinal section through the outer wire of FIG. 3 on line IV-IV.

Die in Fig. 1 und2 dargestellte siebendrähtige Litze besteht aus einem Kerndraht! und sechs schraubenlinienförmig um den Kerndraht 1 gewundenen Außendrähten2. Wie die Fig.2 bis4 veranschaulichen, ist jeder einzelne Außendrahi 2 rundum mit in die urahtoberfläche eingedrückten Vertiefungen bzw. Einprägungen 3 versehen, und zwar mit drei an einer Querschnittsstelle gleichmäßig auf dem Umfang des Außendrahtes verteilten Vertiefungen, die im wesentlicher) flächig ausgebildet sind und auf Grund ihrer großen Längenabmessungen in Umfangsrichtung und Längsrichtung des Drahtes den überwiegenden Teil der Drahtoberfläche bedecken. Die Einprägungen 3 haben eine geringe Tiefe undThe seven-wire shown in Figs The strand consists of a core wire! and six helically wound around the core wire 1 External wires 2. As illustrated in FIGS. 2 to 4, is every single outer wire 2 all around with indentations pressed into the uraht surface or impressions 3 provided, with three at a cross-sectional point evenly on the Perimeter of the outer wire distributed depressions, which are essentially) flat and on Because of their large length dimensions in the circumferential direction and the longitudinal direction of the wire cover the major part of the wire surface. The embossments 3 have a small depth and

sind so ausgebildet, d33 sie sich in Umfangsrichtung des Außendrahtes allmählich von der Drahtoberfläche absenken, wie F i g. 2 erkennen läßt, und in Lanesrichtung des Außendrahtes mit abgerundeten Kanten in die Drahtoberfläche übergehen. Die inare designed in such a way that they extend in the circumferential direction gradually lower the outer wire from the surface of the wire, as shown in FIG. 2 reveals, and in Merge the lane direction of the outer wire with rounded edges into the wire surface. In the

ίο Umfangsricbtung des Drahtes sich erstreckenden Seitenkanten 4 det^Einprägungen 3 sind in einem von 90° abweichenden Winkel zur Drahtlängsachse schräggestellt.ίο Circumferential structure of the wire extending side edges 4 det ^ 3 impressions are in one of 90 ° different angle to the longitudinal axis of the wire.

Hierzu i Blatt ZeichnungenFor this purpose i sheet of drawings

Claims

I 659 265
i 2

kantigt.fi, in the circumferential direction

Patent application: edges executed. Such surface profiles

stanchions in simple straight prestressing steel wires

Wire strand for pre-tensioning of concrete components for the outer wires of Spanish concrete strands unlen with several helically wound 5 suitable and consequently also not intended for use, the flat embossments, because they prove for a prestressed concrete wire strand, characterized in that correct wires, the Before the embossing with one of the embossings (3) would give away most of the wire surface test, cover the surface so that at least two embossings on a cross-sectional part and the high one occurring during stranding due to their high notch sensitivity Wire (2) over the circumference of which even torsional stresses would break.
The invention shows a way which leads to a raised edge (4) of the shortening of the transmission length in the rest of the wire circumference direction, gradually transitioning without an edge into the wire surface strands of the type mentioned above Embossings (3) in a 15 and the stranding of wires provided with a surface profile deviating from 90 ° to the wire elongation are inclined without the risk of breakage. light, and consists in the fact that the impressions

cover most of the wire surface so that each

because there are at least two impressions on a transverse

20 cut parts of a wire are evenly distributed over its circumference and that the rounded

The invention relates to a wire strand for the side edges of the otherwise in wire circumferential pretensioning of concrete components with several turns gradually into the wire surface without an edge helically wound wires, the flat embossing in one of 90 abchige Have impressions. 35 deviating angle to the longitudinal axis of the wire

The tensioning force of strands of the aforementioned type is.

is often only used instead of by end anchoring. The strand according to the invention therefore has external

through mere adhesive anchoring to the concrete, transferring the wires to the surface before stranding. When anchoring a tendon at the waist, fillings are provided so that the so-called transmission length plays the decisive role in the finished strand and the surface profiling over the entire length of the strand. The circumference of each individual outer wire must be kept as small as possible, so that it can be extended over a short length from the end of the spai member, which is embedded in the predominant part of its surface, to the concrete, and therefore also in the area of the helical pre-tensioning force - moderate spaces between the outer wires. For this reason, 35 is sometimes used instead of 35, which would not be achievable if multi-stranded strands were used on the finished simple round wire as a strand similar to conventional, simple tendons, in which, compared to prestressed concrete round wires, a simple round wire with the same cross-section is rolled up to create a notch or notch Roughening carried out on the basis of the helical intermediate would, since in this case the outer wires of the stranded wire could only be grasped in an improved tangential manner in the spaces between the stranded wires. With the inset anchoring of the concrete on the strand and thus the proper formation of the strand, the transmission length is shortened. Significant, surprisingly high shortening of the over- So far, only strands made of smooth, carrying length of a multi-wire strand have been achieved in practice. Surface profiled searches have shown that common she-wires have been used. The transmission length that can be achieved with such a 45-wire strand made up of a core wire and six strands, however, is sufficient for smooth outer wires. 'purposes are not out of the question. Although there are strands formed according dung, like strand is known in the literature, in which the wires with "ine transmission length of only about 55 cm is provided as a surface profiling in the Mitovalen dents gives tel _50th

are. Such wire strands leave the indentations or depressions of the

Strands of smooth, non-profiled wires but no outer wires of the strand according to the invention in Drahtbeachtc nswerte reduction of transmission length circumferential direction gradually and in Drahtlängserreichei, in any case, no such reduction as direction with rounded side edges in the Drahtsie for the aforementioned uses neces- ₅₅ surface-pass, the notch effects are agile and desirable, and therefore the well-known, sharp-edged surface has not been used in practice. chenprofilierungen avoided, so that the profiled

In the case of simple, straight prestressing steel wires, outer wires are known without the risk of wire breaks in various flat depressions as the surface of the bending and small profiling that occurs during stranding, including _surface torsional stresses helically around one-surface profiling from such impressions, each other or around a core wire can be wound in the wire circumferential direction extending cords.

tenränder at an angle deviating from 90 °. In the drawing, an exemplary embodiment is one

run to the longitudinal axis of the wire. Part, the deepen Spannbetondrahtiitze are shown according to the invention, in levies stage wire circumferential direction abruptly in the _sixth namely shows
Wire surface embossed, partly the indentations are Fig. 1 the strand in the view,

gen when they gradually move in the circumferential direction of the wire. 2 shows a cross section of the strand in another

lower it from the surface of the wire, with a sharper scale,