EP2925932B2 - Bridging device for expansion joints - Google Patents

Description

The invention relates to an expansion joint bridging device in the form of a slatted roadway transition, which bridges an expansion joint existing between two structural parts of a drivable structure, which is spanned by at least two traverses. The latter are supported on both parts of the building in a load-bearing manner, with at least one of the load-bearing supports allowing a displacement movement of the respective traverse relative to the relevant part of the building. At least one slat arranged above the traverses is supported on the traverses so as to be displaceable relative to the traverses, with several slats being oriented at least essentially parallel to one another and also displaceable relative to one another. On bridges and comparable drivable structures, expansion joints are provided between the abutment and the superstructure and/or between sections of the superstructure in order to enable damage-free thermal expansion or contraction of the superstructure. Depending on the size of the corresponding bridges, expansion joints of up to a few meters are required. In order to enable vehicles to drive over the relevant expansion joints, expansion joint bridging devices are provided.

In this respect, the use of slat road crossings is known in particular, in which two bridge parts (in this sense the abutment is also considered a "bridge part") are connected to one another by at least two spaced-apart trusses in such a way that the ends of the bridge parts facing each other allow a relative movement The longitudinal direction of the trusses can be carried out towards and away from each other. The traverses are supported by spaced-apart slats that are movable relative to one another and run essentially transversely to the longitudinal direction of the traverses, the respective upper sides of which lie essentially at the height of the roadway of the bridge or can form it, although versions are also known which separate elements forming the passable surface are arranged on the top of the slats. If the ends of the bridge parts move towards each other in the longitudinal direction of the trusses due to thermal expansion, the distance between the slats decreases. If the ends of the bridge parts move away from each other in the longitudinal direction due to thermal shrinkage, the distance between the slats increases. Relevant state of the art in this respect is, for example, the following DE 19705531 C2 , the DE 3514776 C1 and the DE 3212717 C1 .

In regions at risk from earthquakes, there is a risk of abrupt changes in the position of the bridge parts relative to one another (particularly in the longitudinal direction of the trusses or with such a movement component), which, because they exceed the intended working range, may no longer be able to be compensated for by slat road transitions. It is then possible for the bridge parts to move towards each other in the longitudinal direction beyond the normal thermal linear expansions in such a way that the slats initially rest against each other at certain positions of the bridge parts and further movement of the bridge parts towards each other causes internal stresses and possibly damage in the slats or Bridge splitting results. In such cases, it must not only be expected that vehicles will no longer be able to access the bridge after the earthquake; Rather, the damage to the bridge parts and/or the expansion joint bridging device may be so severe that the bridge must be completely rebuilt.

After US 5887308 A An expansion joint system for bridges is known, which is designed to compensate for linear expansions in the direction of travel - caused by normal fluctuations in the ambient temperature - and can withstand seismographic forces occurring in the transverse direction to the road. For this purpose, the expansion joint system comprises a plurality of mutually spaced and displaceable slats, which are supported on a plurality of trusses stored in boxes at the ends. The trusses are each movable on one side in the transverse direction to the roadway of the bridge within storage boxes, so that forces or displacements occurring in this direction, for example due to an earthquake, lead to corresponding transverse displacements of the trusses. The disadvantage is that exceptionally large changes in the gap width of the expansion joint that occur during earthquakes can no longer be compensated for if the slats are already in contact with one another, which can lead to the destruction of the expansion joint system or to its detachment from the structural parts, causing the bridge to collapse will no longer be passable in the event of an earthquake.

The latter applies to the expansion joint bridging device according to the US 5964069 A to. Here, if due to seismic circumstances the gap width of the expansion joint decreases beyond the extent at which the slats abut one another, the entire bridging device is excavated on one side in order to prevent permanent damage. However, this also prevents people from driving on the bridge after the earthquake. And the repair work involves a very considerable amount of effort, quite apart from the fact that in the event of a permanent change in the position of the building parts relative to one another caused by the earthquake, if not a complete rebuild of the expansion joint bridging device is required, it is at least a very complex one Adaptation of the expansion joint bridging device to the new tectonic conditions is required.

The US 2008/0148499 A1 and the EP 1355009 B1 aim to reduce at least some of these disadvantages. This is how it reveals EP 1355009 B1 a bridging device for joint gaps between bridge parts of the type mentioned, which should, if possible, still be accessible to vehicles even after an earthquake - albeit to a limited extent and with considerably more difficulty. The expansion joint construction allows intended changes in the position of the bridge parts adjacent to the expansion joint with respect to one another within initial limits. An additional safety device arranged on one of the bridge parts and on the expansion joint construction is intended to enable further changes in the position of the bridge parts relative to one another without destroying the function of the bridging device or separating the expansion joint construction from the bridge parts. The safety device comprises at least two elements that are firmly connected to one another, which are separated when a defined limit load is exceeded and are then movable relative to one another in a defined manner, with one of the two elements being able to be arranged firmly on one of the two bridge parts. Depending on the design of the safety device, additional position changes in the direction of the traverses and/or transverse movements of the bridge parts relative to one another should be able to be compensated for. The safety device represents a predetermined breaking point, which requires extensive repair measures after the defined limit load is exceeded in the transverse direction to the slats of the expansion joint construction. First, the road crossing must be returned to its original position. Certain elements of the expansion joint construction, including the broken safety device, must then be replaced and adjacent connections repaired.

The ones above in connection with the US 5964069 A However, the disadvantages presented also exist at least in part with the bridging device according to the EP 1355009 B1 .

The object of the invention is therefore to create an improved, functionally optimized expansion joint bridging device of the type mentioned at the beginning, which can also optimally withstand changes in position of two bridged bridge parts caused by earthquakes and provides the best conditions for trafficability after the earthquake or a significantly simplified repair with the least possible effort.

The task is solved by the expansion joint bridging device according to claim 1. On the one hand, this relates to the implementation of the invention in an expansion joint bridging device designed as intended for a small working area (a small gap width), which, in addition to the designated overload safety device, only has a single lamella, so that the expansion joint is through one lamella and the - is bridged by an overload safety device that is not firmly connected to any part of the building. Such expansion joint bridging devices can be used advantageously, for example, where thermal expansions or contractions are of low importance and the risk of abrupt changes in the position of the building parts relative to one another is of high relevance. When implementing the invention for a larger working area, on the other hand, several slats which are oriented at least essentially parallel to one another and are arranged above the traverses are supported on the traverses in a displaceable manner relative to the traverses and relative to one another, in which case the overload safety device is between two of the relative to the traverses and slats that can be moved relative to one another are provided. The following explanation of the invention reflects on its implementation in such expansion joint bridging devices having several slats; However, the aspects presented also apply to expansion joint bridging devices that are designed for a small working area (a small gap width) and which only have a single slat in addition to the designated overload safety device.

According to the claims, the expansion joint bridging device according to the invention is characterized in functional combination with the other design features in particular in that an overload safety device is provided between two of the slats that can be moved relative to the two structural parts, to the traverses and to one another, which two spaced-apart, Support profiles supported on the trusses and a filling profile bridging the gap between the support profiles. Between the two support profiles there is a fixing device that secures their relative position to one another and, when a threshold value for the force acting on the two support profiles in the sense of their approach is exceeded, releases the position securing device in such a way that the two support profiles are displaced upwards out of the gap while displacing the filling profile can be moved towards each other.

The overload safety device can be arranged at any position of the bridging device, ie between any two of the slats, especially if "only" one overload safety device is provided, even more or less centrally on the bridging device. This extremely flexible arrangement of the overload safety device within the expansion joint bridging device makes a contribution to increasing safety against impact forces that occur during earthquakes compared to the known arrangement on the edge of a bridge or building part. The latter are transferred directly to overload safety devices arranged on the edge of a bridge part and can lead to their destruction or damage. Has an “internal” arrangement of the overload protection devices between two of the slats In contrast, the advantage is that seismic impact forces are first transferred to the slats and push the slat packs together. Only when all the slats arranged in front of the overload protection device (in the direction of impact) are in contact with one another are forces transferred to the support profiles of the overload protection device. The slats thus fulfill a buffer function against impact forces that occur in that they first act on the slats in the longitudinal direction and the overload safety device is only triggered in the event of an exceptionally large force, caused for example by an earthquake. The embedding of the overload safety device within the slats of the bridging device also promotes - because of the more or less pronounced symmetry of the load situation this enables - the overload safety device actually only being triggered in the design case intended for this purpose, which means that the bridging device can be driven below the design case underlying tectonic shocks is of greatest advantage. The “internal” arrangement between two of the slats is also very useful for the function of the overload protection device itself; because the filling profile can be lifted out of the gap between the support profiles evenly and without tilting, because the arrangement in the middle of the expansion joint bridging device enables a particularly symmetrical force application on the support profiles.

The overload protection device comprises two outer support profiles, which are mounted on the traverses, and a filling profile arranged between the support profiles, which closes the gap between the support profiles on the road side. When the overload safety device is not triggered, the top of the filling profile (if applicable, together with associated supports) should be at the same height as the top of the slats and the tops of the support profiles (if applicable, including assigned supports) in order to ensure that the rolling surface is as flat as possible the expansion joint bridging device to ensure moving vehicles. The emergence of the filling profile upwards out of the gap existing between the support profiles - which occurs when the overload safety device is triggered - can take place in different ways in terms of construction. In particular, it comes into consideration that the filling profile as a whole is displaced upwards out of the gap without changing its geometry. However, it is also possible for the filling profile to change its geometry when it is pushed upwards out of the gap existing between the support profiles, for example by folding a filling profile consisting of several articulated segments connected to one another upwards.

A fixing device ensures (in the "normal" operating state) that the support profiles are secured in position relative to one another (in the longitudinal direction of the traverses). The strength of this position securing defines a threshold value for forces that act on the support profiles, above which the position securing caused by the fixing device is canceled and the support profiles can move towards one another in the longitudinal direction. During such a movement, the filling profile is displaced upwards out of the gap between the two support profiles (see above), whereby the support profiles, which in turn have a lamella-like function, can move further towards each other and thus the entire extent of the on the traverses resting partial structure of the expansion joint bridging device can be further reduced in the longitudinal direction without it being destroyed due to excessive internal stresses. As already indicated above, the threshold value mentioned can be dimensioned smaller or designed more precisely in the arrangement of the overload safety device according to the invention due to the buffer function of the slats and the possible symmetry of the load situation than in an arrangement at the edge of a bridge part, which means that material, weight and costs can be saved and the function of the overload safety device can be improved.

If a permanent change in the position of the structural parts remains after a seismic event, the expansion joint bridging device can possibly be prepared with minimal effort simply by installing a filling profile adapted to the new situation in such a way that the bridging device is not only provisional but also permanently functionally reliable .

The present invention also allows several (functionally equivalent) overload safety devices - in particular distributed more or less evenly over the extent of the expansion joint bridging device - to be integrated into the latter. This opens up further possibilities for adapting the safety device(s) to the seismic events to be expected - through evaluation of the tectonic situation. It is also possible to arrange two or more overload protection devices directly next to each other between two adjacent slats, in which case, if necessary, a central support profile common to both overload protection devices can be provided. When the position securing is enabled, transverse and height offsets between the bridge parts can be better at least partially compensated for by dividing the offsets between several overload protection devices.

The two support profiles are typically supported on the traverses so that they can slide, although this is not necessarily necessary. It is also conceivable that one of the support profiles is firmly connected to one or more (possibly all) traverses. It is even possible that both support profiles are alternately firmly connected to traverses in such a way that both support profiles are not fixed to one traverse.

In a first development of the invention it is provided that the filling profile is part of the fixing device. This makes it possible to save material for a separate component used to secure the position. In this case, the support profiles are firmly connected to the filling profile on both sides. The filling profile serves as a spacer between the support profiles. An effective position securing can be achieved with force distribution on both sides of the fixing device and a contribution can be made to ensuring that the filling profile can move evenly out of the gap between the support profiles. It is advantageous if the filling profile is connected to the support profiles by means of predetermined breaking connecting elements having a defined breaking force, for example in the form of a screw or rivet connection or a weld seam. Such connections are particularly cost-effective and reliable to calculate.

In a further embodiment it is provided that parts of the support profiles are used to support the filling profile, in that the filling profile with edge regions rests on support regions of the support profiles. This arrangement makes it easier to displace the filling profile when the position is secured, i.e. when the overload safety device is triggered, and material for additional storage can be saved. For the latter embodiment, a sealing support of the edge regions of the filling profile on the support regions of the support profiles can also advantageously be provided. Such a sealing support can, for example, consist of a rubber seal, which is particularly effective in preventing liquid and dirt from penetrating into the space between the support profiles, which is particularly beneficial for protecting the trusses and maintaining the ability of the slats to slide on them.

In a further embodiment it is provided that sliding slopes are provided on the filling profile and/or the support profiles, which promote the lifting of the filling profile when the support profiles move towards one another. These sliding bevels represent a particularly simple and effective means of causing a guided upward movement of the filling profile through the longitudinal movement of the support profiles. The arrangement of corresponding sliding bevels in the area where the filling profile rests on the support profiles and the filling profile is particularly advantageous because a guided movement of the filling profile can be achieved immediately after the position securing has been released. In addition, it makes sense to use the free space within the gap between the support profiles for a further sliding profile, which can be arranged on part of the filling profile and extend over a length that is in the area of the height of the support profiles. With correspondingly designed counterparts on the support profiles, a guided sliding movement of the filling profile can be achieved over almost the entire range of movement of the filling profile.

In a further advantageous embodiment of the invention, the filling profile (in the "normal" operating state of the bridging device) is supported on the traverses. Particularly because the filling profile typically has a significantly greater extent than the slats in the longitudinal direction of the traverses, such intermediate storage makes sense in order to reduce deflection of the elongated upper part of the filling profile located in the area of the road.

In a structural design of this embodiment, the filling profile is connected to the support profiles by predetermined breaking connecting elements in the manner explained above, the predetermined breaking connecting means creating a tension of the filling profile relative to the traverses. This means that constant contact between the filling profile and the trusses can be guaranteed without any major additional construction effort, thereby increasing safety against tilting. It is preferably provided that the filling profile rests on the cross member with a plain bearing. By bracing as explained above, it can be permanently ensured that it always rests on the traverses, even if the plain bearing wears out. In a further structural design of this embodiment, the filling profile is assigned frames surrounding the traverses, which have a sliding spring that braces the filling profile relative to the traverses, and at least one predetermined breaking point, for example in the form of a screw connection. Preferably, the sliding spring is connected on one side to a bottom part of a frame, while the other side of the sliding spring is slidably in contact with the underside of the crossmember. In addition, the filling profile preferably rests on the crossbar with a plain bearing. As a result, constant contact between the filling profile and the traverses can be achieved without higher internal stresses being generated within the filling profile.

Furthermore, if an overload safety device is provided, it is advantageous if it is arranged in the middle of the slat road transition. With an even total number of slats, there are ideally the same number of slats on both sides of the support profiles. If the total number of slats is odd, there will be one more slat on one side of the support profiles than on the other side. In this embodiment, the overload safety device acts like a symmetrical separation for the disk packs. Thus, an expansion joint bridging device that is divided into two by the overload safety device can be created with at least approximately the same number of slats on both sides, whereby the distribution of movements over the individual slats and the longevity of the expansion joint bridging device as a whole can be improved.

The overload safety device resting on the traverses with the support profiles and preferably also with the filling profile Although, as explained above, it is typically movable in the longitudinal direction of the traverses, it reacts more slowly than the individual slats due to its higher weight compared to a slat and a correspondingly higher frictional force. This helps ensure that the slats on both sides of the support profiles are stressed more evenly. As a rule, one of the bridge parts is displaceable in the longitudinal direction of the trusses and the other is mounted in a stationary manner in the longitudinal direction of the trusses. In the event of a relative movement of the bridge parts to one another, for example in the form of a thermally caused linear expansion of at least one bridge part or a change in position of a bridge part, which does not lead to a tripping of the overload safety device, the overload safety device can remain in its position relative to the traverse, whereby the trusses can move in and out of truss boxes. Ideally, all slats are activated and moved equally, with the relative movement on both sides of the overload protection device being distributed almost equally across all slats.

The provision of a lifting protection between the support profiles and the traverses can make a further contribution to the functional reliability of the overload safety device by improving the seating safety of the support profiles on the traverses. This can prevent the support profiles from detaching upwards undesirably. In addition to reducing the risk of the support profiles becoming detached from the trusses, tilting of the support profiles can also be effectively prevented. A perfect fit of the support profiles on the traverses facilitates the intended movement of the filling profile in an emergency and thus increases the functional reliability of the overload safety device. In the structural design of such a lifting protection, a frame is advantageously provided (with a small distance around the cross member in question), which can be connected on its top side to the support profile by a screw connection, which serves as a predetermined breaking point, between the frame and the respective Traverse preferably (above) sliding blocks and / or (below) sliding spring blocks are arranged.

The protection against tilting of the support profiles can be further increased in this embodiment by providing spacer elements arranged between the frames of the two support profiles below the crossbars, which are connected to the frames by means of predetermined breaking connecting elements. In this way, both support profiles are coupled together, their seat on the trusses is further stiffened and their distance from one another is further secured.

Furthermore, it is advantageous to provide at least one sliding spring within the frame, which braces the support profiles relative to the traverses. Said sliding springs can be connected in a particularly simple manner on one side to the lower side of a frame, while the other side of the sliding spring is slidably in contact with the underside of the traverse. Compared to the at least one sliding spring, an identical number of sliding bearings should be arranged between the upper inner side of the frame and the top of the crossmember. In this arrangement, the spring forces of the sliding springs advantageously act in the same direction as the mass forces of the support profiles.

This allows the pretension of the sliding springs and the inertia of the overload safety device with respect to movements along the traverses and the security against tilting of the support profiles on the traverses to be further increased. These effects can be further enhanced by using several sliding springs per frame and support profile or larger sliding springs, in which case the frame should advantageously have an extension in the longitudinal direction L of the traverse that is sufficient to completely accommodate the sliding springs.

Furthermore, it is advantageous if the support profiles and/or the filling profile have a passable surface on their top side facing the road. This design allows the top side of the support profile to serve directly as a road surface for the bridge without having to apply another layer or overlay, which means that material, weight and costs can be saved.

In a further development of the subject matter of the invention, it is provided that the support profiles are sealed from adjacent slats by means of deformable sealing membranes, which effectively prevents moisture and dirt from penetrating at this point and getting to the trusses, which in particular protects the trusses and preserves the The sliding properties of the slats on these benefit.

Also advantageous (particularly in the sense of the symmetry of the loading conditions already discussed above) is the load-bearing support of the trusses on the structural parts that can be moved on both sides. The trusses preferably protrude into truss boxes on both ends.

Fig. 1

einen parallel zur Richtung der Traversen geführten Schnitt durch eine erfindungsgemäß ausgeführte Dehnfugen-Überbrückungsvorrichtung,

Fig. 2

eine vergrößerte Darstellung der Überlast-Sicherheitseinrichtung und der an diese angrenzenden Lamellen gemäß dem Ausschnitt B aus Fig. 1,

Fig. 3

eine Querschnittsansicht der Traverse und der Stützprofillagerung gemäß Schnittführung A-A durch die Überlast-Sicherheitseinrichtung aus Fig. 1,

Fig. 4

einen der Perspektive der Fig. 1 entsprechenden Schnitt durch die der Dehnfugen-Überbrückungsvorrichtung aus Fig. 1 mit ausgelöster Überlast-Sicherungsvorrichtung bei vorgesehenem nahezu minimalem Abstand der Stützprofile zueinander,

Fig. 5

einen parallel zur Richtung der Traversen geführten Schnitt durch eine erfindungsgemäß ausgeführte Dehnfugen-Überbrückungsvorrichtung mit einer einzigen Lamelle,

Fig. 6

einen parallel zur Richtung der Traversen geführten Schnitt durch eine Ausführungsform einer erfindungsgemäß ausgeführten Dehnfugen-Überbrückungsvorrichtung mit einem dem Füllprofil zugeordneten Rahmen,

Fig. 7

eine Querschnittsansicht der Traverse und der Füllprofillagerung gemäß Schnittführung durch die Überlast-Sicherungseinrichtung aus Fig. 6.

An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. This shows:

Fig. 1

a section parallel to the direction of the trusses through an expansion joint bridging device designed according to the invention,

Fig. 2

an enlarged view of the overload safety device and the slats adjacent to it according to detail B Fig. 1 ,

Fig. 3

a cross-sectional view of the traverse and the support profile bearing according to section AA through the overload safety device Fig. 1 ,

Fig. 4

one of the perspective of the Fig. 1 corresponding cut through the expansion joint bridging device Fig. 1 with the overload safety device triggered and the support profiles being provided with an almost minimal distance from one another,

Fig. 5

a section parallel to the direction of the trusses through an expansion joint bridging device designed according to the invention with a single lamella,

Fig. 6

a section parallel to the direction of the trusses through an embodiment of an expansion joint bridging device designed according to the invention with a frame assigned to the filling profile,

Fig. 7

a cross-sectional view of the traverse and the filling profile bearing according to the section through the overload safety device Fig. 6 .

Figure 1 shows the exemplary embodiment of an expansion joint bridging device 1 according to the invention with a slat road transition 2, which is arranged between two bridge parts 3 for bridging an expansion joint 4.

Several trusses 5, of which in Fig. 1 one is shown, span the expansion joint 4 and are each slidably mounted in the longitudinal direction L in two traverse bearings 6, which are attached to two supports 8 of the bridge parts 3. The two truss ends 9 protrude into truss boxes 10 of the bridge parts 3.

Several slats 11 are supported on the traverses 5. The slats 11 are slidably mounted on the traverses 5 in the longitudinal direction L and are arranged parallel to one another. Between two slats 11 there is an elastic sealing membrane 12 connected to them to protect the expansion joint bridging device 1 below the roadway level 13, on which there is preferably a road surface suitable for vehicles to drive on in the sense of a drivable surface, in particular from moisture and dirt . The top sides of the slats 14 run at the same height as the road level 13. The sliding slat bearings 15 surround the traverses in a frame shape, with 5 sliding blocks arranged at the top between the frame of the slat bearing 15 and the traverse and 5 sliding spring blocks at the bottom between the frame of the slat bearing 15 and the traverse are. The slats 11 can be connected to one another (in the sense of distance control) via mechanical distance controllers, not shown, through which the displacement behavior of the slats 11 relative to one another can be controlled when a force acts on them in the longitudinal direction L. The movement of the outermost slats 11 on the left and right is limited on one side in the longitudinal direction L by the edge profiles (projections 16) of the bridge parts 3 and the spacers 7 (which act as stops with the lower sections of the frames of the slat bearings 15).

To this extent, the expansion joint bridging device relies on the well-known state of the art, so that there is no difference either in terms of construction or in terms of the intended function (compensation for thermal expansion or contraction of the bridge parts 3 by changing the distances between the slats 11 that are slidably mounted on the traverses) require further explanation in the design or working area.

An overload safety device 17 is arranged between the total of 16 slats 11 on the left side and 17 slats 11 on the right side, the gaps between the overload safety device 17 and the slats 11 adjacent to it being closed by sealing membranes 12.

From the in Figure 2 shown enlarged section B of Figure 1 It is particularly clear that the overload safety device 17 - which can be moved in the longitudinal direction L - has two support profiles 18 spaced apart from one another in the longitudinal direction L and a filling profile 32 arranged between them and bridging the gap S between the two support profiles 18, with one in normal operation The fixing device that secures the position of these parts to one another works. The two support profiles 18 comprise, in a certain static manner based on the slats 11, each a profile head 19, a profile foot 20 and a profile web 21 welded to both, with additional stiffening elements 22 welded to the said three parts of the support profiles, each with an oblique stiffening side surface 23 are provided. On the respective profile foot underside 24, support profile bearings (described in more detail below) are connected to each support profile 18, which are connected to the profile feet 20 via a pair of first screw connections 26 and in particular each comprise two sliding blocks 25 which can slide in the longitudinal direction L on the cross member 5.

The profile heads 19 have hooks 27 extending in the direction of the adjacent slats 11. Guide elements 28 extending in the same direction are firmly connected to the profile head tops 29 of the (essentially cuboid) profile heads 19. Between the hooks 27 and the guide elements 28, the sealing membranes 12 are firmly clamped at the edges in corresponding cavities. All slats 11 have clamping devices 30 and hooks 27 similar to the upper guide elements 28, whereby the sealing membranes 12 can be clamped both between two slats 11 and between slats 11 and support profiles 18.

The filling profile 32 has a plate 33 and a base 34 connected to it. The outer left and right edge regions 59 of the plate 33 of the filling profile 32 rest on the profile head tops 29 of the profile heads 19 which form the supporting regions, the supporting profiles 18 being opposite the plate 33 of the filling profile 32 by means of sealing supports 58 are sealed. The profile heads 19 of the support profiles 18 are fastened to the filling profile 32 by a pair of second screw connections 31, which form part of the upper of two parts of the fixing device and are designed as predetermined breaking screw connections. The plate top 35 of the plate 33 runs at the same height as the roadway level 13. The oblique plate side surfaces 36 of the plate 33 rest on corresponding oblique guides 37 of the guide elements 28. The base 34 of the filling profile 32 comprises a web, a filling profile foot 40 and stiffeners welded to these parts and the plate 33, the latter having oblique base sides 38 that converge downwards. A filling profile bearing 41 rests on the filling profile foot 40, which rests on the cross member 5 without play in the longitudinal direction L and is identical to the sliding blocks 25. The second screw connections 31 are tightened so tightly that the filling profile 32 is braced relative to the traverses 5 by means of the filling profile bearings 41. The filling profile bearing 41 is firmly connected to the filling profile foot 40 of the base 34 by a pair of third screw connections 42.

Figure 3 shows in a sectional view according to section AA Figure 1 in particular the support profile bearing, which is similar in its basic structure to the partially visible slat bearings 15. The profile foot 20 of the support profile 18 is firmly connected to a frame 43 encompassing the crossmember 5, which prevents the support profile 18 from moving upwards in the height direction H in the sense of a lifting protection. The frame 43 has two elongated side parts 44 and flanges 45 firmly connected to them, which are firmly connected to the profile base 20 via the first screw connections 26. The frame 43 is closed at the top by the bearing plate 46 arranged between the flanges 45 and the profile base 20. The two associated sliding blocks 25 are arranged at the bottom of the bearing plate 46 and lie slidably on the upper traverse flange 52. In the area of their lower ends, the side parts 44 are firmly connected to the base part 47. A spacer element 48 with a T-shaped cross section, which runs below the cross member 5 and forms the lower of the two parts of the fixing device, is connected to the frame 43 assigned to the two support profiles 18 by being attached to the bottom part 47 of the frame 43 via a pair of fourth screw connections 49 is attached. The fourth screw connections represent predetermined breaking screw connections. Between the base part 47 and the lower traverse flange 50 there is a sliding spring bearing that is resilient in the height direction H in the form of two sliding springs 51 spaced apart in the longitudinal direction L.

The function of the expansion joint bridging device 1 in the event of a movement of the two bridge parts 3 towards each other that exceeds the normal design operation or working range is as follows:
Should the two bridge parts 3, for example due to an earthquake or other seismic event, move towards one another in the longitudinal direction of the trusses by a greater amount than defined by the slats 11 resting against each other or on the support profiles 19 of the overload safety device 17 - Corresponds to the design minimum distance, the overload safety device 17 comes into play for further compensation of the change in position, up to the closest approximation of the support profiles 18, which in Figure 4 is shown.

Via the slats 11, which rest against one another as a block, mutually directed displacement forces are transmitted from the bridge parts 3 via the slats 11 adjacent to the support profiles 18 of the overload safety device 17 to the support profiles 18 themselves. The displacement forces are introduced into the upper and lower parts of the fixing device, which initially determines the distance between the support profiles 18 from one another. When a predetermined threshold value is exceeded, the second screw connections 31 (associated with the plate 33 of the filling profile) and the fourth screw connections 49 (associated with the spacer element 48), which represent predetermined breaking connecting elements of the fixing device, shear off. This releases the positioning of the support profiles 18 and allows them to move towards each other. If the support profiles 18 move towards each other, the plate 33 slides with its oblique plate side surfaces 36 on the oblique guides 37 of the guide elements 28 and the filling profile 32 moves upwards in the height direction H.

If the support profiles 18 have moved so far towards each other that the oblique base sides 38 rest on the upper, mutually facing head edges 55 of the profile heads 19, the oblique base sides 38 can slide along the head edges 55 and the filling profile 32 can move further in the height direction Move H up. This sliding movement is possible until the base edges 56 arranged at the ends on the base sides 38 have reached the height of the head edges 55. A slight further approximation of the two support profiles 18 with simultaneous upward movement of the filling profile 32 is then still possible by the filling profile bearing 41 sliding on the stiffening side surfaces 23. This movement is possible until the mutually facing sides of the profile feet 20 and sliding blocks 25 rest against each other, with the filling profile foot 40 finding space between the profile heads 19 of the two support profiles 18 in this position. In this position of the support profiles 18, the minimum expansion of the Expansion joint bridging device 1 reached.

In the Fig. 5 Expansion joint bridging device shown 1 has a single lamella 11. The support profiles 18 and the filling profile 32 of the overload protection device 17 are supported on the traverses 5. At the through Fig. 5 In the expansion joint bridging device 1 shown, the gap between the right projection 16 of the right bridge part 3 and the overload safety device 17 is closed by a sealing membrane 12, which, however, is not designed to absorb forces, in particular in the longitudinal direction L of the traverse 5. The gap between the left projection 16 of the left bridge part 3 and the overload safety device 17 is closed by the single lamella 11 and two sealing membranes 12 with the aforementioned properties.

Figs. 6 and 7 show an embodiment of one of the overload safety devices 17 explained above with frame 57 screwed to the filling profile 32 by screw connections 60 serving as predetermined breaking connecting elements, which frames 57 completely enclose the traverses 5. The frames 57 of the filling profile 32 have the same elements as the frames 43 of the support profiles 18. The sliding spring 58 exerts a spring force on the lower traverse flanges 61 and the bottom parts 62 of the frame 57, whereby the filling profiles 32 are positioned relative to the traverses by means of the filling profile bearings 41 5 be braced.

Claims (19)

1. An expansion-joint bridging device (1) formed as a lamellar carriageway crossover (2), which bridges an existing expansion joint (4) between two building structure parts (3) of a building structure which can be driven over, with the following characteristics:

   - the expansion joint (4) is spanned by at least two cross-members (5) which are supported in a load-bearing manner on both building structure parts (3), wherein at least one of the load-bearing supports (6) allows a displacement movement of the respective cross-member (5) relative to the relevant building structure part (3);

   - at least one lamella (11) arranged above the cross-members (5) is supported displaceably in relation to the cross-members, wherein if multiple lamellae are present, they are displaceable relative to the cross-members and relative to each other, and are aligned parallel to each other; characterized by the following features:- an overload protection device (17), which is not rigidly fixed to either of the building structure parts (3), is provided at least substantially parallel to the at least one lamella (11), if multiple lamellae (11) are present, between two of them;

   - the overload protection device (17) comprises two support profiles (18) positioned at a distance from each other and supported on the cross-members (5), and a filler profile (32) which bridges the gap (S) between the support profiles (18);

   - between the two support profiles (18), at least one fixing device (31, 49) acts to secure their positions relative to one another;

   - if a threshold value for the force acting on the two support profiles (18) which would cause them to converge is exceeded, the fixing device (31, 49) releases the positional securing to the extent that both support profiles (18), by displacing the filler profile (32) upwards out of the gap (S), can move towards each other.
2. The expansion-joint bridging device (1) according to claim 1, characterised in that the filler profile (32) is part of the fixing device (31).
3. The expansion-joint bridging device (1) according to claim 1, characterised in that the filler profile (32) is connected to the support profiles (18) by means of connecting elements (31) with a predetermined breaking point.
4. The expansion-joint bridging device (1) according to claim 1, characterised in that the filler profile (32) is supported by its edge regions (59) on the support regions (29) of the support profiles (18).
5. The expansion-joint bridging device (1) according to claim 4, characterised in that a sealing layer (58) of the edge regions (59) of the filler profile (32) is provided on the support regions (29) of the support profiles (18).
6. The expansion-joint bridging device (1) according to claim 1, characterised in that sliding chamfers (23, 36, 37, 38) are provided on the filler profile (32) and/or the support profiles (18), which favour the lifting of the filler profile (32) when the support profiles (18) converge.
7. The expansion-joint bridging device (1) according to claim 1, characterised in that the filler profile (32) is supported on the cross-members (5).
8. The expansion-joint bridging device (1) according to claim 3 and 7, characterised in that the filler profile (32) is braced against the cross-members (5) by means of the connecting elements (31) with a predetermined breaking point.
9. The expansion-joint bridging device (1) according to claim 7, characterised in that the filler profile (32) is assigned to frames (57) surrounding the cross-members (5) with a sliding spring (58) for bracing the filler profile (32) against the cross-members (5) and at least one connecting element (60) with a predetermined breaking point.
10. The expansion-joint bridging device (1) according to claim 1, characterised in that the overload protection device (17) is arranged between essentially equal numbers of lamellae (11).
11. The expansion-joint bridging device (1) according to claim 1, characterised in that an anti-lift protection (43) is active between the support profiles (18) and the cross-members (5).
12. The expansion-joint bridging device (1) according to claim 11, characterised in that frames (43) surrounding the cross-members (5) are assigned to the support profiles (18).
13. The expansion-joint bridging device (1) according to claim 11 or 12, characterised in that between the frames (43) of the two support profiles (18) spacer elements (48) arranged beneath the cross-members (5) are provided, which are connected to the frames (43) by connecting elements (49) with a predetermined breaking point.
14. The expansion-joint bridging device (1) according to one of claims 11 to 13, characterised in that at least one slide spring (51) respectively is arranged inside the frames (43) for bracing the support profiles against the cross members.
15. The expansion-joint bridging device (1) according to claim 1, characterised in that the support profiles (18) and/or the filler profile (32) have an upper surface (13) which can be driven over.
16. The expansion-joint bridging device (1) according to claim 1, characterised in that the support profiles (18) are sealed against the adjacent lamellae (11) by means of deformable sealing webs (12).
17. The expansion-joint bridging device (1) according to claim 1, characterised in that the cross-members (5) are displaceably supported in a load-bearing manner on both sides on the building structure parts (3).
18. The expansion-joint bridging device (1) according to claim 1, characterised in that the ends of the cross-members (5) on both sides extend into cross-member boxes (10) .
19. The expansion-joint bridging device (1) according to claim 1, characterised in that a plurality of functionally identical overload protection devices (17) are provided.

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