DE9420037U1 - Joint tape - Google Patents

Description

The invention relates to a joint tape according to the preamble according to claim 1, which is particularly suitable for bridging longitudinal joints.

Such a joint tape is known from DE-OS 26 47 839. With such a joint tape, the attachment of the movable, essentially trapezoidal middle leg to the structural parts must always be guaranteed, even if the structural parts move vertically against each other. Such vertical movements occur, for example, when a train crosses the track of a suitably equipped railway bridge, which leads to a deflection of the structural part loaded by the train. Nevertheless, it must be prevented that ballast etc. penetrates into the movement gap between the joint tape and the structural part, since otherwise the joint tape would be destroyed within a short time.

In order to improve the lateral pressure even in unfavourable movement situations, it has become known from DE-OS 27 3 8 429 to use a tension cross under the middle leg, whereby the pressure is increased by the tensile stresses introduced during movement.

Such joint tapes have basically proven themselves and are used in a wide range of areas.

In various applications it is necessary to adapt the sealing level to the local conditions, for example to allow it to run upwards or downwards. To this end it has been suggested to create smooth transitions with correspondingly large curvature radii, whereby the use of elastomers for the joint tapes allows for relatively good flexibility.

While the side tabs of the band can be stretched relatively easily to achieve the required curvature when bending upwards and remain in the desired position when anchored in the surrounding in-situ concrete, the problem with bending downwards is that the middle leg is difficult to stretch due to its solid construction, so that either high forces have to be introduced or the tabs extending laterally below the middle leg tend to curl, which has a negative effect on the tightness.

To avoid such curling, the entire strip could be put under tension. However, the tension increases the pressure and thus the friction in the transition area when bending downwards between the trapezoidal middle leg and the adjoining structural part to such an extent that the desired sliding is no longer possible. On the other hand, this area is also regularly under load, so that damage to the strip occurs here.

Furthermore, numerous designs for transitions of joint tapes have become known. For example, a joint tape has become known from DE-OS 21 41 419 which is intended to seal the transition between curb height and street height. The relatively solid joint tape is glued with its vertical leg to the horizontal leg that runs across the road. However, this solution has the disadvantages that are already described in DE-OS 26 47 839, since it deals with seals. With a corresponding height offset, as would occur with a longitudinal joint tape, the block profile would no longer be able to follow the movements and detachment phenomena and a gap would arise next to the sealing tape. In the application of a transverse joint tape shown there, it is also necessary to seal the connection with an additional thin plastic film. Due to the forces introduced

However, the thin plastic film tends to peel off and is then sooner or later no longer able to withstand the forces introduced.

In contrast, the invention is based on the object of creating a joint tape, in particular a longitudinal joint tape, according to the preamble of claim 1, which enables a flexible height adjustment of the sealing level, in particular in bridge structures, is durable and enables a connection to be produced inexpensively.

This object is achieved according to the invention by claim 1. Advantageous further developments emerge from the subclaims.

The invention is characterized by particular flexibility in adapting longitudinal joint tapes to different sealing levels. The effect that the joint tape according to the invention can be bent with a small radius of curvature without or with little stress can be exploited particularly favorably here, so that the transition area from the horizontal to the vertical course is very small. Surprisingly, despite the omission of the solid bridge leg, the stability and sealing reliability are not impaired, which is mainly due to the fact that the part of the joint tape according to the invention without a bridge leg extends essentially vertically. This means that the required support, for example of a ballast bed, can take place in the plane above the bridge leg, but the vertically extending joint tape is not exposed to any particular stress. Due to the relatively low thickness, the required deflection can be easily absorbed.

For example, if a bridge support is located 80 cm below the height of the longitudinal joint strip, and the longitudinal joint

If the band is then to be pulled down in the area of the support to a sealing level approximately at the height of the support, a corresponding swivel movement around the support occurs when the bridge bends. Even in the case of strong deflection, for example in the case of a bridge with a span of 20 m, the swivel movement at the upper end of the bridge structure is only about 2-3 cm, which can easily be absorbed by the connecting band according to the invention.

It is particularly advantageous that the construction according to the invention does not impair the vertical mobility of the components relative to one another, and that the tightness can be easily ensured to the required extent, especially in the transition area between the horizontal and vertical parts of the joint tape. To do this, it is possible to pull the connecting tape so far up towards the bridge leg that the inner area of the essentially trapezoidal body of the joint tape is completely overlapped in plan view. To improve the connection, it is possible to design the cutting line of the joint tape, i.e. the line along which the bridge legs and side legs are cut off to enable the connecting tape to be inserted, in the manner of a cove, in order to enable a certain radius for the course of the connecting tape in the transition area.

It goes without saying that the connecting strip can be inserted either in prefabrication or on site. Depending on requirements, it is possible to either insert the connecting strip abutting between the end flaps or to vulcanize the connecting strip in such a way that a certain overlap is created on the sides.

It is understood that only in the vertical section of the joint tape a removal of at least the bridge leg is provided according to the invention, and that at the end of the vertical section of the joint tape on both sides

against horizontal sections that encompass the bridge leg.

It is also possible to first lay the joint tape on site in the desired manner and then, once the joint tape has been laid, simply cut off the bridge leg and, if desired, the side legs and then glue or vulcanize the connecting tape onto the cut surfaces.

According to a modified design, the connecting band is to be formed by the side legs. For this purpose, it is advantageous if the structural parts do not extend all the way to the edge of the end plates, but end just before the transition area between the end plates and the side legs. Due to the lateral extension of the end plates, this can be easily achieved. In this design, the bridge leg is cut off just below its transition to the side legs, so that the side legs extend quite far upwards in an unloaded state. The side legs are then bent towards and downwards towards each other and vulcanized together so that they butt against each other, whereby it is advantageous to pre-tension the side legs further downwards beyond the center plane of the end plates while the vulcanization is curing. The side legs then strive to assume their original position, but are unable to do so due to the vulcanization seam, which keeps them in a horizontal position. In this design, the ends of the end tabs are bent slightly downwards, so that the joint tape has a slightly wavy shape when viewed in the transverse direction. However, this does not affect the ability to bend downwards, so that the joint tape can be bent into the vertical leg with a small radius of curvature and can run there in the desired manner.

According to an alternative design, it is intended to close the end of the bridge leg with a type of plug.

seal, which is conveniently glued or vulcanized in. This solution allows a vertical cut for separating the bridge leg, although it is understood that the mobility of such a plug is limited, so that this solution is only suitable for small movements in the transition area between the vertical and horizontal sections.

What is particularly advantageous about the solution according to the invention is that it is possible to avoid jumps in stiffness if the transition area is designed accordingly. To do this, it is only necessary to select the cutting plane not as vertical, but rather, for example, rounded or at an angle of 45 degrees, so that a smooth transition is achieved.

According to the invention, the particular flexibility is also to be emphasized, which also allows, for example, two horizontal joint tapes with bridge legs extending laterally to be used on a vertical section of the joint tape that is equipped with the connecting tape. Such transitions can also be used to achieve a crossing between the joint tapes designed as longitudinal joint tapes and the similar joint tapes used as transverse joint tapes, whereby it is understood that horizontal joints can also be covered in addition to vertical joints.

Further details, advantages and features emerge from the following description of several embodiments based on the drawing.

Show it:

Fig. 1 shows a section through an embodiment of a joint tape according to the invention;

Fig. 2 shows a cross-section through the joint tape according to Fig. 1;

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Fig. 3 shows a longitudinal section through another embodiment of a joint tape according to the invention;

Fig. 4 is a plan view of the joint tape according to Fig. 3;

Fig. 5 shows a cross-section through a third embodiment of a joint tape according to the invention;

Fig. 6 is a longitudinal section through the joint tape in the configuration according to Fig. 5; and

Fig. 7 is a perspective view of another embodiment of a joint tape according to the invention.

The joint tape 10 shown in Fig. 1 has a bridge leg 12, to which two side legs 14 and 16 are connected, which can be seen better in Fig. 2. Two end tabs 18 and 20 are connected to the lower ends of the two legs, which run horizontally essentially parallel to the bridge leg 12 and are embedded in separate structural elements 22 and 24, which can be seen in Fig. 2.

The joint 26, which can also be seen in Fig. 2, extends beneath the bridge leg 12 and enables the movement of the structures 22 and 24.

A part of the joint tape is severed along a cutting line 28. In the case of the embodiment described here, the cutting line extends from the bridge leg 12 initially vertically to the lower end of the side legs 14 and 16 and then runs horizontally at the base of these at the end tabs 18 and 20. The bridge leg and in the present case the entire side legs are thus removed, so that in the cutting area 30 of the tape only the end tabs 18 and

remain. Between these end tabs 18 and 20 - as can also be seen better in Fig. 2 - a connecting band 23 is inserted. The sealing connection between the end tab 18 and the connecting band 32 on the one hand and the connecting band 32 and the end tab 20 on the other hand is made by vulcanization, which can be carried out either on site or in prefabrication. It goes without saying that an adhesive connection can also be made instead.

The open end of the joint tape below the bridge leg 12, resulting from the cut along the cutting line 28, is closed in the embodiment shown with a plug 34, which has a certain excess and thus seals. If necessary, the plug can also be vulcanized or glued in.

The connecting band 32 preferably has a certain excess compared to the attachment to the end plates 18 and 20. This allows both a height offset and a width change of the joint 26 to be compensated. To a certain extent, this also applies to a longitudinal offset, which introduces shear movements into the connecting band 32.

It is important that the area of the connecting band 32 is not subjected to vertical loads. For example, as long as the joint band still runs horizontally there, a cover plate can extend above the structures 22 and 24 that overlaps the joint 26 and is movable on the structures 22 and 24, which absorbs loads such as gravel, etc. It is also possible to have the joint band merge into the vertical section immediately after the plug 34, while in the embodiment according to Fig. 1 the vertical section 36 begins at a slight distance from the plug 34.

The connecting band 32 can be easily formed together with the end plates 18 and 20 with a relatively small radius of curvature 38

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fold downwards. This is a significant advantage, as the structures 22 and 24 can then be designed practically as cuboids, which enables a significant cost reduction compared to sealing levels that smoothly merge into one another.

It is understood that the connecting band 32 does not have to be fitted exactly in the plane of the end plates 18 and 20. Due to its flexible design, it automatically assumes the desired central position around a bending axis when the joint band is bent downwards.

It is also understood that the curvature of the joint tape in the transition area between a horizontal section and the vertical section 36 can also be upwards if desired.

As can be seen from Fig. 2, the joint tape extends in its area formed by the side legs 14 and 16 and the bridge leg 12 essentially in a trapezoidal shape or in the shape of an inverted U. The bridge leg 12 is quite solid and designed to absorb and support loads. In contrast, the side legs 14 and 16 are of significantly lower material thickness, as are the end plates 18 and 20. The end plates 18 and 20 are anchored in the structures 22 and 24 via a plurality of anchoring projections 42.

A further embodiment of the joint tape according to the invention can be seen in Fig. 3. Here, as in the other figures, the same parts correspond to the same reference numerals, so that a further description is unnecessary. In the embodiment according to Fig. 3, in contrast to the embodiment according to Fig. 1, no plug is provided. Instead, the connecting tape 32 extends so far upwards that it covers the open area below the bridge

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leg 12 overlaps in a sealing manner. The vulcanization then takes place on the front surface of the bridge leg 12 as well as on the side legs 14 and 16 and seamlessly connects to the connection with the end plates 12 and 18. In this embodiment, the cutting line 28 is rounded in the transition area between the longitudinal and cross-section, so that a hollow groove is created when viewed from above/outside. This allows a smooth transition of the joint tape between the cutting area 30 and the support area 44, in which area the joint tape 10 runs unprocessed. It goes without saying that - if desired - the cut along the cutting line 28 can also be kept very oblique, for example it can extend upwards at an angle of 30° in order to further expand the rigidity transition area.

Since there are usually no large deflections of the structures 22 and 24 in the area shown here, this is not necessary, so that the course shown in Fig. 3 is favorable.

As can be seen from Fig. 3, the curvature in the transition to the vertical section 36 occurs immediately after the beginning of the cutting area 30. The connecting band 32 thus takes on the shape of a gently curved S in this embodiment. It is preferred that the end tabs 18 and 20, which extend in the vertical area 36 on the structural members 22 and 24, are clamped on in a manner known per se in order to ensure the required seal.

As can be seen from Fig. 4, the joint tape equipped with the connecting tape 32 protrudes from the structural elements 22 and 24 and then runs vertically downwards. It is understood that the entire longitudinal joint tape can also be attached to the structural elements 22 and 24 in a corresponding manner, as shown, for example, in Fig. 7.

The design according to Fig. 5 differs from the design according to Fig. 3 in that the connecting band is omitted or is only formed by the vulcanization area of the side legs. This design is suitable for an application in which the end plates are not completely cast in in-situ concrete, but are clamped onto the building structures 23 and 24, for example, since it requires a somewhat greater load-bearing capacity of the end plates 18 and 20 in the transition area to the side legs 14 and 16. For this embodiment, the bridge leg 12 is removed just below its transition to the side legs 14 and 16. The side legs 14 and 16 are then bent towards each other and vulcanized to each other in the horizontal position. Due to their elasticity, they form a suitable transition for an essentially horizontal course of a joint tape that allows small curvatures. However, since a certain inherent elasticity of the joint tape tends to return the side legs to their original position, it is advantageous if the bonding is carried out even in a downwardly overstretched position.

It is understood that this solution requires special measures for sealing the recess below the bridge leg. According to Fig. 6, a piece of overlapping tape is vulcanized on, which extends along the cutting line 28 and completely overlaps the bridge leg and the remaining stumps of the two legs 14 and 16.

A further embodiment of a joint tape according to the invention can be seen in Fig. 7. In this embodiment, the structure 24 extends further than the building body. This is necessary, for example, in the case of railway bridges with tracks running opposite the traffic route to be crossed. Since the sleepers should always lie fully either on the ground or on the bridge, in this embodiment

For example, a bridge structure 22 may be set back from another bridge structure 24. The sealing level on the bridge side is also higher than the sealing level of the fill, so that a sealing level transition must be implemented. This can be implemented particularly favorably with the inventive design of the joint tape.

For this purpose, the joint tape initially runs on the building bodies 22 and 24 in the manner that has long been known. Starting with the transition area 46 to the vertical section 36 of the joint tape 10, a connecting tape 32 is then used instead of the bridge tape 12. In this design, the side legs in the transition area 42 are cut out laterally and the bridge leg runs downwards towards the area of the end tabs 18 and 20. The joint tape 32 then connects to the bridge leg. As can be seen from Fig. 7, the end tab 20 extends at an angle to the end tab 18 after it has been clamped onto the flank of the building body 24. The connecting tape 32 therefore takes on a concave shape, which is easily possible due to its elasticity.

After a horizontal joint is to be sealed in the lower sealing level, the joint tape 10 extends there transversely and to the corner between the structure 22 and the structure 24. This means a double connection for the connecting tape 32 and correspondingly also for the end flaps 18 and 20. The end flaps 18 and 20 are therefore preferably mitred, as shown in Fig. 7, and there is an overlap, which always ensures sealing. In this design, the connecting tape 32 is then vulcanized laterally to the bridge leg 12 and extends upwards in a groove following the cut and bent side leg 18.

It is understood that numerous modifications of the presented

The embodiments shown are possible. For example, it is possible to use the bridge leg as a connecting band. To do this, it is necessary to completely separate the side legs, with the cutting lines then tapering towards the end in a wedge shape. The side leg 12 is then vulcanized onto the end tabs 18 and 20 or onto the stubs of the side legs 14 and 16, and then also extends practically in the plane of the end tabs. However, it is understood that in this design, such a small radius of curvature as with a separate connecting band is not possible, since the bridge leg 12 is held relatively solid.

It is also understood that it may be advantageous to at least partially or completely remove the anchoring projections 18 and 20 at least in the transition area 46. By this measure, the radius of curvature 38 can be further reduced if necessary.

Furthermore, it is also possible to cut the joint tape equipped with the connecting tape 32 again at a mitre across the joint tape and then to vulcanize the cut line again so that the joint tape is bent at a right angle.

Claims (9)

Protection claims 1. Joint tape, in particular longitudinal joint tape, with a bridge leg, to which two side legs are connected at their respective one end, with two end tabs designed for anchoring to a building with two structures extending laterally from the other end of the side legs in a plane spaced apart from the bridge leg, characterized in that the two end tabs (18, 20) are sealingly connected to one another on at least one part of the joint tape (10) by separating the bridge leg and at least one part of the side legs (14, 16), in particular via a connecting strip (32)." ACCOUNTS: DEUTSCHE BANK AgJ MjJr-fc^EN*, K &thgr;&dgr;9 .,'POSTSIRO: MUNICH 6OO SUN -SUN 7 2. Joint tape according to claim 1, characterized in that the connecting tape (32) extends essentially in the same plane as the end tabs (18, 20). 3. Joint tape according to one of the preceding claims, characterized in that the connecting tape (32) has the same thickness and in particular the same material as the end tabs (32) and is connected to the latter in a butt joint. 4. Joint tape according to one of the preceding claims, characterized in that the connecting tape (32) is formed by a film laminated onto the two end flaps (18, 20) and overlapping them. 5. Joint tape according to one of the preceding claims, characterized in that the side legs (14, 16) are each cut off from the end tabs (18, 20) to form bridge leg stubs, the bridge leg stubs being used for vulcanizing the connecting tape. S. Joint tape according to one of the preceding claims, characterized in that the connection between the connecting tape (32) and the end plates (18, 20) is made by vulcanization on site. 7. Joint tape according to one of the preceding claims, characterized in that the connecting tape (32) is formed by one or more side legs (20, -18) which are bent laterally towards the other end tab (14; 16) and are tightly connected to one another. 8. Joint tape according to one of the preceding claims, characterized in that the opening at the transition from the bridge leg (12) to the connecting band (32) is closed in particular by vulcanization and in particular a plug (34) is vulcanized in. 9. Joint tape according to one of the preceding claims, characterized in that, in order to close the opening at the end of the profile consisting of the bridge leg (12) and the two side legs (14, 16), the connecting tape (32) is bent or angled in front of the profile and fastened there, in particular connected by vulcanization.