DE1684393A1 - Tendon arrangement for prestressed concrete structures - Google Patents

Description

Essen, January 12, 19.67 C 27 820 / Ri-)

PATENTANV / ALT

Dr. Andre je wski

Essen, KeitwigerStr. 36

(Arn Hairplhahr.hoi · Lichtbarg)
Telephone 25802

Patent application

of the company Max Paul & Sons

Machine factory

Dürmentingen / Württ.

Tendon arrangement for prestressed concrete structures.

Tendon arrangements for prestressed concrete structures are known in various embodiments. In particular, those are known with combined into a bundle Tendons, especially tension wires, which are preferably run through a distributor piece in pipes and spread to form individual wires to be anchored in an anchor plate, as well as with the spiral and clamping jack for the individual wires surrounding the divider piece and the individual wires. Basically can uan tendon arrangements for prestressed concrete structures Divide into two groups. Once such orders, at which the entire bundled tendon is tensioned at once will, tou other tendons in which the individual 3 χ; and then rest or sparing wire groups are tensioned one after the other » The first group, the tensioning of all bundled wires of a tendon together has the consequence that in the case of bends of the tendon, the entire bundle is attached to the tendon channel moves at the same time and individual wires cannot jam each other. So there are in the curvatures

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in the cladding tube nosed spacers necessary, which the production the tendons more expensive * Also can be proportionate fine cladding tube can be used, leading to further. ϊ Cheaper leads, for these reasons have turned out to be a lot such tendons have so far been implemented in practice. After the structures are getting bigger and bigger ^ and apart from that it also shows that the use * The largest possible tendon is most economical there is an increasing tendency towards the use of ever larger tendons. However, this also means that correspondingly large clamping jacks are required for tensioning the bundled tensioning wires. These large and unwieldy jacks are a significant disadvantage with large tendons. Furthermore, it prepares Difficulties in introducing the large forces concentrated at the tendon end favorably into the concrete. They are anchor plates large dimensions and further corresponding reinforcements in the concrete are necessary. The first group of tendon arrangements, In which individual wires or groups of wires, e.g. strands, are tensioned one after the other, the latter have fe disadvantages not to the extent, however, are also here in the As a rule, the forces introduced in a fairly concentrated manner and must therefore be distributed over the concrete by means of an anchor plate. Compared to the first-mentioned tendon arrangements, these arrangements have the advantage that they are light, handy presses can be used for tensioning. Of particular disadvantage is, however, that in such tendons spacers are necessary in the area of curvatures, otherwise you will see the Wedge or wedge the individual wires against each other in the ducts.

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jam, which entails additional work and expense brings the spacers and the larger ducts with it.

The invention is based on the object of a tendon arrangement for reinforced concrete construction that combines the advantages of "bundle tension" with those of individual tension as described above united.

The invention relates to a tendon arrangement for prestressed concrete structures, with tendons combined into a bundle, in particular tension wires, which are preferably in ducts run through a distributor piece and anchored to form individual wires in an anchor plate, as well as with the Distributor and spiral surrounding the individual wires and Clamping press for the individual wires The invention consists in that the tension wires on single wire presses - spaced apart and - a single wire press on each individual tension wire at the same time connected as well as the individual wires at the same time are tensioned and anchored together individually in the anchor plate. Furthermore, the invention recommends that the jacks as slim high-pressure clamping jacks are designed. Preferably the anchor plate is a concrete pressure plate in a manner known per se upstream, while the spiral is concreted in at the end in this concrete pressure plate, thereby creating a connection with the To get anchoring. The distributor piece which is surrounded by this at the other end of the spiral is expedient as a concrete cone executed with reinforcement, which is poured with concrete after inserting the ducts and sealing with rubber.

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The invention also relates to a method for tensioning " the tendon arrangement, with which uniform anchoring can be achieved particularly easily and simply. This method is characterized in that the individual wire presses placed on each individual tension wire are operated simultaneously to tension the individual wires.

In the tendon arrangement according to the invention, the Dimensions of the anchor plate selected so large that the specific pressure of the concrete pressure plate is kept sufficiently small, to transfer the forces that occur from the anchor plate to the concrete without risk of damage. Because the on the anchor plate acting forces are not concentrated, but are evenly distributed over several points and. attack as individual forces, the anchor plate can be kept relatively thin. This results in the same advantages as with tendon arrangements occur with bundled wires, but without their disadvantages, namely the use of a large and unwieldy clamping jack as well as risky introduction of force at the tendon end into the concrete. Next will be the Advantages of such tendon arrangements achieved in which the wires are tensioned one after the other. For this purpose, in the case of the connecting link arrangement according to the invention, a corresponding number used by small handy clamping jacks that can easily be operated by a single operator. at With the arrangement according to the invention, tendons in the order of magnitude of 200 to 400 tons of clamping force can be realized,

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which in a fraction of the usher for such a tendon » Arrangement required time can be tensioned by a single operator, even in inaccessible places. Opposite to the known arrangements in which the individual wires are clamped one after the other is also the great advantage. present that the introduction of the tension forces into the concrete completely risk-free * In addition, when working with the tendon arrangement according to the invention, tendon anchors Can be produced much more economically than with the known embodiments.

In the following the invention is explained in more detail with reference to a drawing showing only one embodiment! show it:

1 shows a tendon arrangement according to the invention in side view, partially cut,

Pig, FIG. 2 shows a section through the object according to FIG the line A-A and -

3 shows, on a reduced scale, a section through the object according to Figure 1 along the line B-B «

In. The figures show a tendon arrangement 1 for prestressed concrete, which consists of tendons assembled into a bundle in the embodiment of tensioning wires.

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in which they are spread out to form individual wires 5 and leave the distributor piece: 4 as individual wires 5, each surrounded by a cladding tube β, which are finally anchored in an anchor plate 7. The distributor piece 4 and the individual wires 5 are surrounded by a spiral 8. The individual wires 5 are tensioned by means of tensioning jacks 9. » which are only indicated schematically. For this purpose, the tension wires 5 are spread apart at a single wire press spacing and a single wire press 9 is connected to each individual tension wire 5 at the same time, and the individual wires are thus tensioned at the same time and individually anchored together in the anchor plate 7. The clamping jacks or single wire jacks 9 are designed as slim Höohatdruok clamping jacks. A concrete pressure plate 10 is arranged on the anchor plate 7 in a manner known per se, into which the spiral 8 is concreted at the end. The distributor piece 4, which is surrounded by this at the other end of the spiral 8, is designed as a concrete cone with a rectangular cross-section and reinforcement. In the region of the bundling, that is to say at the tapered end of the concrete cone, a trumpet-like extension 11 adjoins the distributor piece 4.

Claims t

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Claims (5)

Expectations 1. Tendon arrangement for prestressed concrete structures, with tendons combined into a bundle, in particular tensioning wires, which preferably run through a distributor piece in ducts and are to be anchored in an anchor plate, spread apart to form individual wires, as well as with the distributor piece and the individual wires ■ surrounding spiral and tensioning jack for the individual wires, 'characterized in that the tension wires (2) jdaß spread on single-wire press ene distance and -an each tension wire (2) at the same time a single-wire press (9) connected sowießamit the individual wires annt (5) simultaneously gip ^ and together individually in the anchor plate (7) are anchored. 2. tendon arrangement according to claim 1, characterized in that the Spannpre:
are executed. that the clamping jacks (9) press on as slim maximum pressure 3. tendon arrangement according to claim 1 and 2, characterized in that that the anchor plate (7) in a sicL feeV-o * mter way a concrete pressure plate (10) vorgeordnat and in this concrete pressure plate (10) the spiral (8) is concreted in at the end. 4. tendon arrangement according to claims 1 to j5, characterized characterized in that the distributor piece (4) surrounded at the other end of the spiral (8) is designed as a concrete cone with reinforcement is. 5. A method for tensioning the tendon assembly according to claim 1, characterized in that individual wire presses placed on each individual tension wire for tensioning the individual wires simultaneously be operated. Patent attorney Dr. Andreevsky 109815/0575 L eersei f e