DE1940423A1 - Wire or wire rope for the production of pre-stressed, reinforced concrete - Google Patents

Description

"DRAH AND DRARTSELL FOR THE PRODUCTION OF PRE-TENSIONED, REINFORCED CONCRETE "Prior to this application, priority will be derived from the Italian patent application No. 18084 A / 69 of June 12, 1969.

The above invention relates to a type of wire a wire rope that was used to produce prestressed concrete can.

It is known that products made of prestressed concrete also by means of "Haftdrahttechnik-" can be produced. It is here, more precisely said to be wires or wire ropes made of Bederstahl, which are able to withstand the prestressing forces, which were previously induced in the wires to be transferred to the concrete. These Power is transmitted through the sheer adhesion of wire to concrete.

The wires are pre-tensioned on suitable tracks where they are be anchored between two heads, which are located at the end of the lanes. The wires are then pre-tensioned up to the calculated value and then between two suitable clamping jaws to be fixed.

This is followed by the concrete pouring process and after the concrete has set the jaws are released and the wires are released. Because of the elasticity the wires conditionally, try to retreat to their original position, however, this is prevented by the adhesion between the wire and the concrete. The preload forces However, the wires are transferred to the concrete and this is thus pre-tensioned, whereby the concrete is given increased resistance.

There is a precisely defined limit value for the coefficient of adhesion Steel to concrete; these values are determined by the pre-tensioning force of the wires (and thus the pre-tensioning of the concrete part) is exceeded, the Made of steel from the concrete, whereby the prestressing of the part is canceled and any purpose of the reinforcement becomes obsolete.

jThe main purpose of the above invention is to the disadvantages mentioned by using a special type of wire or a wire rope for reinforced concrete, which improves the adhesion to the concrete is going to eventually get the same end result of preloading with a smaller wire Diameter or, which is the same, with the same wire pre-tension a greater pre-tensioning of the concrete and a better distribution of force in the area of the conglomerate.

The wire according to the invention offers these and other advantages for armored, prestressed concrete, which is characterized in that it is at suitable intervals is provided with elements protruding in the radial direction, which real, multiple Form anchors and ultimately lead to greater adhesion between the wire and conglomerate guards.

According to one embodiment, each one protrudes in the radial direction Element made up of one or more 1) pieces of wire, which are tight and helical around the wire are wound, causing a longitudinal movement of the radially standing end pieces is prevented.

The wire rope;, (consisting of two or three individual wires), receives by twisting together wires made in the aforementioned manner.

The invention will now be described with reference to an embodiment which is only of an exemplary nature, described and in the accompanying drawing shown.

La and Ib show in a side view and in a cross-sectional view a wire of a conventional type; 2a and 2b show a wire rope which was made from three conventional wires.

Figures 3a and 3b show, in the same way as mentioned above, a Wire with improved adhesion made in accordance with the above invention became; and FIGS. 4a and 4b show in the same way a wire rope, which from three wires according to the invention - was produced.

Referring to the accompanying drawing, A denotes the wire and with B the wire rope, as shown in Figures la-lb and 2a-2b, denotes.

According to the above invention, the wire carries improved Adhesion (Fig. 3a-3b) evenly spaced wire spirals C, which, like it is shown in the drawing, C and C 'are wound in pairs and respectively two end pieces t and t ', which extend tangentially and therefore in protrude radial direction and are offset from each other by 90 °. These End pieces form, more than the spirals C, the actual anchoring elements, which considerably improve the adhesion between wire and concrete.

The diameter of the wire forming the spirals can be anything from Case by case or depending on the distance between the elements, what a Function of the static load is to be selected.

It should be emphasized that it is necessary to hold the spiral tightly around the wire to be wound in order to avoid a relative movement between the wire and the spiral. to For this purpose it would be beneficial to use a wire with a square or rectangular cross-section to choose.

As for the wire rope with improved adhesion (Fig. 4a-4b) -, so it can be said that this after production of the individual wires (Fig. 3a-3b) is manufactured.

Instead of the spirals -0, c *, which form the anchoring elements, other parts attached to the wire can also be attached, e.g. steel plates, discs, etc.

Finally, it can be noted that the spiral twisting of the Wires to a wire rope B the anchoring element with a view to slipping made more stable on the wire rope.

Even if only one embodiment according to the above invention was described and shown in the drawings, it is conceivable that in practice numerous other forms, which however always on the main idea of the invention based, can be devised without, however, departing from the scope of the invention.

Claims (5)

P A T E N T A N S P R Ü C H E Wire for reinforced, prestressed concrete, characterized in that that it has elements (C, O ') protruding in the radial direction at suitable intervals shows which real and multiple anchoring of the wire (A) in the BeJ n guarantee and that thereby an increased adhesiveness of the wire (A-) in relation on the conglomerate is achieved. 2. Wire according to claim 1, characterized in that each in radial Direction protruding element (C, C ') consists of several pieces of metal wire; Which are wound tightly and in a spiral around the wire (A) so as not to and to be able to move, and that the wire piece ends (t, t ') extend radially. 3. Wire according to claim 1, characterized in that the in elements (C ', C') protruding in the radial direction made of steel plates or discs, which are fixed in a favorable manner on the wire (A) exist. 4. Wire according to claim 1 and 2 or 3, characterized in that the distance between the anchoring elements (O, C ') as a function of the static Load is changeable. 5. Wire rope for reinforced, prestressed concrete, characterized in that that it is made by twisting two or three wires (A), which according to of the invention mentioned are provided with anchoring elements (C, C ') will.