DE3620019A1 - Automatically acting wedge anchoring means whose operation can be stopped at certain times - Google Patents

Abstract

In the case of tension members with automatically acting wedge anchoring means, it is often necessary to retain the wedge anchoring means, for holding back, for the purposes of inspection, maintenance and exchange. The invention proposes embodiments in which, in the case of a plurality of tension rods, each tension-rod wedge anchoring means has the necessary play in the axial and radial directions in order to be able to operate in a disruption-free and precise manner. <IMAGE>

Description

For wedge anchorages for tendons in prestressed concrete construction or for other tensioning or lifting devices, in which tension members (tensioning links), it is always necessary to change the ver hold back anchor wedges to disable them. This may be necessary to e.g. to leave the tension members behind, so relax, or around the anchoring wedges individually or ge together, as convenient as possible, for inspection, maintenance or exchange to be able to pull out work.

Versions are known in which one side in the Ver anchor wedges on the thick side, parallel to the axis of the instep links, tapped holes and the screws with screws has withdrawn anchor wedges. Because of the limited space This is not a good solution, also because the screws are difficult can adjust to an exact dimension and this may happen unintentionally adjust.

There are also known designs in which by interlocking Ring grooves between anchoring wedge and corresponding ring parts Retaining the wedges is possible (German patent 25 06 395). Here is, however, the free, unimpeded anchoring of the anchoring wedges not possible.

To achieve the same possible tension for a plurality of tie rods It is to reach (strands) within a tension member (tendon) of the utmost importance that the individual tie rods in each Clamping stroke to be clamped the exact same way as possible. To it would be necessary for every single wedge to be exactly the same when clamping same release path and when anchoring without relative movement between Make the wedge and tie rod exactly the same jamming path would. Due to manufacturing tolerances of all parts, it is in practice difficult to achieve. You can only do that in practice Keep manufacturing tolerances as low as possible and when anchoring ver any relative movement between tie rod and anchoring wedge prevent.  

First, all the obstacles to the wedge must be in axial Direction to be eliminated. In particular, these are also friction forces acting in the axial direction. The anchoring wedges must individually determine their two end positions; position and once an open position, which is the train free link to pull through. Radially acting Forces on the anchoring wedges should also be avoided especially as far as the friction between the anchoring wedge and tension reduce the rod and thus a relative movement between them both parts can be enlarged or brought about. Highlight Such radial forces can be called on the anchoring Wedges due to manufacturing inaccuracies, especially here Axial misalignment of the different parts.

According to the invention it is now proposed, fig. 1, to have by design measures the wedges as free as possible, that they are pressed by the spring ring 3 a to the tie rod 4, so that a sufficiently large friction occurs between the parts 2 and 4 and no relative shift occurs. Appropriate dimensioning of the distances 7 a , b , c is intended to ensure free movement of the anchoring wedges 2 , in particular in the axial direction.

The sum of dimensions 7 a + 7 b must be kept as large as is necessary for the anchoring wedge to function properly. If the dimension 7 a becomes zero when tensioning, the anchoring wedge must have come loose from the tie rod 4 , even with an axle set, as can usually occur in practice.

A further pull on the tension member 4 must be possible between the anchoring wedges 2 and the tension member 4 without damaging scraping. The tensioner, which is supported on the anchor plate 1 and pulls on the tie rods 4 or leaves the tension, is not shown on the undersigned statement. Normally there is also between the anchor plate 1 and the tensioning press, not shown, a support piece (not shown) (anchoring piece), which enables access to the anchors by means of openings. The holding plate 6 can, for example, be fastened to pipe half-shells 8 and 9 and Ge thread tie rods 10 on the anchor plate 1 or on the tensioning press or on the anchoring chair between the anchor plate 1 and the tensioning press. It can also be fastened to a hydraulic piston so as to be displaceable in the axial direction.

To relax the piston in the floating position of the anchoring wedges 2 can be moved in the clamping direction 11 and held firmly.

For maintenance, control or replacement of the anchoring wedges, one will expediently move the holding plate 6 with the annular fixed holding parts 5 and the attached anchoring wedges 2 by a greater distance in order to have better accessibility. In order to be able to replace defective spring washers 3 a , c , d and e , it is proposed to create a depot on such rings ( 3 b ), as shown. A replacement of these possibly defective rings is otherwise only possible after dismantling the clamping press and the holding plate 6 .

With the fastening options in detail y of Figure 1, an articulation of the holding part 5 is achieved, which is particularly geous before the holes of the anchor plate 1 and the holding plate 6 are offset.

Another development and improvement of the invention is shown in Figure 2 Ab. The coupling groove in anchoring wedge 2 is screwed b here from the outside and the connection between the wedge 2 b and the part 5 is formed by a circular segment-like annular body 12 (2 or more segments). Appropriate dimensioning ensures that the anchoring wedge 2 b is longitudinally displaceable as in Figure 1 ( 7 f + 7 k) .

For this purpose, it is particularly proposed to carry out the design such that the spring ring 3 c presses on the wedge 2 b via the segments 12 b and thus additionally prevents a relative displacement between 2 b and the rod 4 .

The dimensions 7 d and 7 e are kept as small as possible, but so that a certain articulated mobility of the segments 12 is still possible. The design is carried out so that when the spring ring 3 e presses the segments 12 together at the separation points, there is still play at 7 h and 7 g . About the segment-like ring body 12 is now a sufficiently articulated Ver connection between the part 5 and the anchoring wedge 2 b is made and additionally a better pressing of the anchoring wedge 2 b on the pull rod 4 is given.

Any axis misalignment that is conceivable in practice should therefore be followed without partial consequences.

Figures 3 , 4 and 5 show further possible embodiments of the invention.

In Figure 3 , the annular retaining parts 5 are designed as half shells, which are held together by means of a spring ring 3 e and a threaded ring 13 a . The sum of the dimensions 7 i and 7 r is chosen so that proper loosening and anchoring of the anchoring wedges 2 is ensured. The ring depot 3 b is arranged on a loosely pushed ring, item 14 .

Compared to Figure 3 , as shown in Figure 4 , an internal groove is inserted into the anchor wedges 2 . The holding part 5 is in one piece and, for example with locking ring 13 b optionally locked with Ge ring 13 a . The ring depot 3 b is again arranged on a loose ring, item 14 .

In Figure 5 it is shown that the anchoring wedge position 2 is designed so that a holding part 5 can be omitted. The 3 segments of the anchoring wedge 2 are held together via the spring ring 13 b . By appropriate dimensions 7 n , o and p , as mentioned before, the axial displacement and the articulation ensures. In this embodiment, the spring ring 13 b additionally supports the spring action of the ring 3 a .

As far as the axial misalignment of the holes in the plate 1 and the plate 6 can be kept within the necessary limits, but an axial misalignment of the tie rods 4 is in an impermissible size, it can be done by attaching a plate 6 b to the existing plate 6 a guide of the drawbar can be achieved by appropriate dimensioning of the play 7 t (Figure 1). The same can be achieved by appropriately dimensioning the game for 7 s , Figure 2.

Claims (18)

1. Device for optional wedging or not wedging a tension member when tensioning or leaving ment with anchoring anchors Seg, with a groove on the thick wedge end from the outside or from the inside, characterized in that the anchoring wedges are articulated and connected with axial play with a holding plate 6 , so that the anchoring wedges can freely assume the necessary positions for anchoring and releasing. 2. Device according to claim 1, characterized in that in the groove of the anchoring wedge an annular retaining part 5 engages with cams, which is fastened by a thread on the holding plate 6 be and the sum of the dimensions 7 a and 7 b is so large that the anchoring wedge can take its two end positions unhindered. (Illustration 1). 3. Apparatus according to claim 1 and / or 2, characterized in that the connection between the holding part 5 and the holding plate 6 by means of a ring 13 a or 13 b leads out with play, so that the part 5 receives a certain flexibility and can take part in the unwanted axis misalignment occurring in practice without harmful effects on the connection between the holding part 5 and the anchoring wedges 2 a . (Figure 1y). 4. Apparatus according to claim 1 and / or 2-3, characterized in that a segmentar term ring body 12 with spring washers is used between wedge 2 b and retaining part 5 . (Fig. 2). 5. Apparatus according to claim 1 and / or 2-4, characterized in that the spring ring 3 c presses over the segment parts 12 on the wedge 2 b and a displacement on the tie rod 4 additionally hindered Lich. (Figure 2). 6. The device according to claim 1 and / or 2-5, characterized in that the play between the segment-like ring body 12 and the anchoring wedges 2 b in the groove is made only so large that the axis displacements occurring in practice can be collected in an articulated manner . (Digits 7 d, 7 e) . 7. The device according to claim 1 and / or 2-6, characterized records that between the segment-like ring body12 and the holding part5, in places7 H and 7G, the game like that is made as large as possible, but that the cam overlap about part5 and the parts12 is still sufficient. (Figure 2). 8. The device according to claim 1 and / or 2-7, characterized in that the sum of the dimensions 7 k + 7 f is chosen so large that the anchoring wedge can assume its two end positions unhindered. (Figure 2). 9. The device according to claim 1 and / or 2-8, characterized in that by creating a depot on rings 3 b at positions 3 a and 3 c always flawless rings are available, which a pressure of the anchoring wedges 2 b on Ensure tie rods 4 optimally. (Figure 2). 10. The device according to claim 1 and / or 2-9, characterized in that the contact surfaces between the segment-like ring body 12 and the retaining part 5 and between the ring body 12 and the wedge 2 b are slightly inclined, Win kel 7 w, so that the segment parts 12 are pressed slightly inwards when the surfaces are in contact in both end positions. (Figure 2x). 11. The device according to claim 1 and / or 2-10, characterized in that the game necessary for anchoring and loosening between two-part holding part 5 and holding plate 6 is arranged. Dimensions 7 i and 7 r . (Figure 3). 12. The apparatus of claim 1 and / or 2-11, characterized in that a loose ring 14 with spring washer depot 3 b is arranged between the holding part 5 and the holding plate 6 . (Figure 3). 13. The apparatus of claim 1 and / or 2-12, characterized in that the necessary for anchoring and releasing the game between the anchoring wedge 2 and the holding plate 6 and between the ring 13 b, which engages in the holding part 5 , and the holding plate 6 is arranged . (Figure 4). 14. The apparatus of claim 1 and / or 2-13, characterized in that a loose ring 14 with spring washer depot 3 b is arranged between the anchoring wedge 2 and holding plate 6 . (Figure 4). 15. The apparatus according to claim 1 and / or 2-14, characterized in that the anchoring wedge 2 is fixed with play by means of ring 13 b on the holding plate 6 , so that the game from the sum of the dimensions 7 n +7 o is sufficient, to reach the positions necessary for anchoring and loosening. (Figure 5). 16. The apparatus of claim 1 and / or 2-15, characterized in that a loose ring Pos. 14 with spring washer Depot 3 b (not Darge provides) is arranged between the anchoring wedge 2 and holding plate 6 . (Figure 5). 17. The apparatus of claim 1 and / or 2-16, characterized in that, if necessary and appropriate, a guide plate 6 b is attached to the holding plate 6 and a guide of the train rods is achieved by appropriate dimensioning of the gap 7 t . (Illustration 1). 18. The apparatus of claim 1 and / or 2-17, characterized in that, if necessary and appropriate, within the holding parts 5 by appropriate dimensioning of the game les 7 s a guide of the tie rods 4 is achieved. (Figure 2).