EP3227495B1 - Road expansion joint with finger plates - Google Patents

Description

The invention relates to a roadway transition and in particular the mounting arrangement of the finger plate in a cage, as well as their easy maintenance.
A roadway is equipped at the transition, for example, between bridges or tunnels for different expansion of the roadway with corresponding road junctions.
These transitions are known in various embodiments and are partially performed with finger plates for better bridging the expansion gap.
In the embodiment according to the invention of such a transition, the fastening arrangement is designed for easy interchangeability, so that in the case of maintenance, the fastening arrangement can be easily and easily replaced. Furthermore, a simple height compensation is possible, so that at different road heights this can be easily adapted to the transition.
With the roadway transition according to claim 1 and the following, dependent claims a simple and quick change without milling, drilling or welding and a simple height compensation is possible, resulting in a much shorter roadblock and lower maintenance costs.

In the construction of roadways partially bridges or tunnels are required due to the terrain, the lanes of which expand and contract differently according to the rest of the road. To compensate for these Dehnwege of different components and to avoid stresses roadway transitions are known in various designs. One embodiment, to which the subject invention relates, relates to a roadway transition with finger plates, which mesh with each other and thus allow the most comfortable possible driving over expansion joints. As the fingers over the cage in the expansion joint protrude, the finger plate must be screwed firmly to the cage accordingly. Known roadway crossings with screwed finger plates are in EP 1 359 254 A2 and EP 1 033 442 A2 described. Known transitions have fixed the finger plate from above with a screw in a cage-welded nut. This embodiment is disadvantageous in particular for two reasons:
First, according to the standard, HV fasteners must be tightened to the nut of a mounting kit, not the screw, which is not possible in this case.

Secondly, during maintenance work, such as a partially broken finger plate, the entire mounting set must be replaced, since according to the standard, a high-strength, preloaded screw must be tightened only once with torque and when loosening both the screw, as well as the mother, so the entire mounting set to be renewed got to.

Since the mother is in known cases welded in the cage, it must be drilled out and then a new mother to be rewelded. On the one hand, this is labor-intensive, and therefore time-consuming and cost-intensive.

In addition to the high costs, on the other hand, the duration of the roadblock is especially significant, which often takes several days and is bound by the necessary welding process to a suitable weather.

Thirdly, the thickness of the finger plate and the cage also defines the connection height to the roadway and can only be adapted with correspondingly thick finger plates. This results in high costs.

Fourth, the non-defined bearing surface is created by the direct support of the finger plate on the cage, which can lead to crevice corrosion by corresponding gaps with insufficient sealing.

Fifth, care must be taken for cost reasons in the cage and the finger plate in each case the lowest possible heights resulting from the road surface height to use. This leads to the use of relatively short screws, which is also disadvantageous in HV glands, as they can loosen relatively quickly when settling and thus loss of tension, which is essential to avoid.

To circumvent these disadvantages, a mounting arrangement should be found where the nut can be tightened on the screw, and the mounting set easily and without expensive tools or Machining equipment, especially drilling milling machines or welding equipment and can be replaced without damaging the KO protection. Therefore, a fastening assembly that is designed in accordance with the standard (attachment of the torque through the nut), as well as an easily replaceable mounting set (screw, nut and washers) has the aim of the invention. Furthermore, a defined application of force between finger plate and cage and a simple height compensation should be possible.

This object is achieved by an inventive roadway transition according to claim 1 and the following dependent claims.

The invention is based on the FIGS. 1 to 4 which show a possible embodiment of the fastening arrangement, described in more detail.

In the FIG. 1 the view from above is shown on such a roadway transition.

In the FIG. 2 is an exemplary embodiment in sectional view to see. In this case, the finger plate is cut in the middle of the contact surface to the cage, so that a Befestigungsgarnitur is visible, the second not.

In the FIG. 3 is an exemplary embodiment with a shear pin to see in section. In this case, the finger plate is cut in the middle of the contact surface to the cage, so that a Befestigungsgarnitur is visible, the second not.

In the FIG. 4 is a further sectional view shown with a corresponding shear pin.

In a finger transition finger plates (20) serve to make a crossing over the necessary expansion joint as homogeneous as possible and to avoid shocks both on the vehicle crossing, as well as on the transition itself as possible. For the geometric design of the fingers various designs are known, which will not be discussed here. The invention is suitable for all types and designs of finger plates (20).
For lane crossings with a finger plate (20) this must be screwed to a cage (30).

In addition, on the cage (30) a Dehnfugenprofil for drainage (not shown) and mounting straps (40) for reinforcing bars (41) for better and secure attachment in the concrete attached.
Likewise, it requires an angle profile (50) as a stop for the subsequent road surface (60).

A finger plate (20) has several fingers and is also screwed several times. Typically, the finger plates (20) are screwed together two consecutive times and several times side by side. In the FIG. 1 is a part of such a finger plate (20) to see the two times in succession and in the figure three times side by side, each with a mounting set (10) is screwed.

The invention is concerned with the type of connection, wherein, for example, an illustrated connection of finger plate (20) with the cage (30) by two mounting sets (10) one behind the other and correspondingly in the width (transverse direction of the road junction) depending on the dimensions and static requirement accordingly often described side by side. Naturally, this invention also applies to only one, or three or more mounting sets (10) per transverse position of the finger plate (20) with a cage (30). For better readability is in the episode on the in the FIG. 1 illustrated arrangement with two mounting kits (10) received per transverse position and no longer mentioned different numbers.

As a mounting arrangement, the interaction of cage geometry (30), a possibly intermediate Schubdorns (25) and the configuration of the finger plate (20), and the mounting set (10) will be described. The Befestigungsgarnitur (10) consists of a screw, a nut and two washers, as they are for a prescribed in this case HV-connection in the screw 10.9 strength. The screws and nuts are designed as hexagon bolts or nuts.

The fastening arrangement is carried out such that the tightening torque can be applied via the nut.

For this purpose, in the finger plate (20) at the corresponding position, a through hole for the screw and at the upper position a larger diameter Aufnehmung for the washer, or the nut and the corresponding wrench provided.
In the cage (30) has a groove for receiving the screws and the screw head facing washer is provided in cross section. This groove consists of at least 3 different widths.
In the upper (the finger plate (20) facing) the groove has the width of the screw shaft and a corresponding oversize, including the groove for receiving the washer at least have their width with a corresponding oversize and in the bottom region, the groove has the width of the spanner of the Screw head to the necessary oversize. Because this groove is only the width of the wrench size with oversize, the screw can indeed be introduced, but can not turn in the groove and is thus secured against rotation. This rotation lock is important so that the nut of the mounting kit (10) can be tightened without the screw rotates.
The respective excess results from product technical and manufacturing tolerances and is in each case between 0.2 and 3.0 mm. The oversize can be selected differently for each width in the specified range.

The introduction of the grooves in the cage (30) can take place from one side (from the finger plate (20) facing side) or from several sides. If processing is also carried out from below or from the side, these areas are subsequently closed again with a cover or another potting compound. It is also possible that a small area remains free as a drainage opening to the concrete.

In the middle between the two mounting kits (10), at least through the grooves for the screw shaft, or the thread, a hole in the diameter of the washer and oversize designed so that the screw can be inserted with washer and then pushed into position. This insertion opening can also be carried out at a different position, so that one, two or more screws are threaded one behind the other from one side. The simpler Legibility is also only spoken here of the central opening.

In an additional embodiment, between the cage (30) and finger plate (20), a seal can be introduced, which prevents the ingress of moisture. The seal covers in this case the surface of the milled groove from above (the finger plate (20) facing side) and is itself again as a slight depression in the cage (30) and / or the finger plate (20) with a recessed, preferably milled geometry positioned.
The seal is made of an elastomer which includes all elastic rubbers and silicones underneath.
The seal may be in the form of a sealing plate with certain external geometry and recesses for screws and any bolt installed and may be stamped out of a web but also made by other molding processes such as injection molding.
In the case of a recessed geometry in the cage (30) that substantially conforms to the seal external geometry, the seal accurately positioned by the recessed seal receiver positions the two screws protruding through the seal and an optional bolt in the proper position later placement of the finger plate (20) on the screws much easier.

In addition, a thrust pin (25) may be located between the finger plate (20) and the cage (30).
This shear pin (25) is inserted both in the finger plate (20), as well as in the cage (30) in a corresponding recess and serves to absorb forces. Such a thrust mandrel (25), for example, shear stresses, as they arise during braking, acceleration or even turning of vehicles on the finger plate (20) record better than the Befestigungsgarnituren (10) alone.
The recess is between 2 and 30mm, preferably between 2 and 10mm both in the cage (30), as well as in the finger plate (20). Of course, within these dimensions, different recesses on the cage (30) and finger plate (20) are possible.
The recesses lead not only to more precise, defined bearing surfaces, but also to the power transmission by means of positive locking, which is essential safe shear stresses transmitted, as by the otherwise prevailing frictional engagement.

By the defined processing of the corresponding recordings a much more accurate, planar processing is possible here, as over the entire cage (30) or the entire bearing surface of the finger plate (20). As a result, a more precise application of force and power transmission from the finger plate in the cage, later in the substructure possible.
For better corrosion protection, the shear pin (25) can also be used with a liquid seal or other seal in the wells.
Another advantage results from the ability to produce the thrust mandrel (25) at different heights and thus very easy to adapt to different road heights (60). For a larger height it only takes longer screws, the rest of the transition does not need to be changed. This is particularly advantageous for renovation work, if not only the transition, but also the road (60) is rehabilitated and thus usually results in a different connection height.
The spacing between the cage (30) and the finger plate (20) is between 0 and 200 mm, preferably between 5 and 130 mm.
The height of the Schubdorns (25) is therefore between 4 and 260 mm.
The thrust pin (25) may be located next to the screw, but preferably the mounting set (10) through the thrust pin (25) performed, or pushed the thrust pin (25) over the pre-positioned in the cage (30) screws. For this purpose, the shear pins (25) at the corresponding positions on through holes for the screws of the mounting set (10), which significantly facilitates the subsequent placement of the finger plate (20) on the screws.

The cross-sectional shape of the thrust mandrel (25) may be rectangular, preferably with rounded edges, oval, round or have another geometry. Particularly preferably, a rectangular cross section is used with semicircular ends on the two short sides.
The shear pins (25) can be made of steel, stainless steel, other metals, in particular aluminum alloys, but also of plastic, in particular fiber-reinforced plastic.

In addition, surface treatments of the shear mandrels (25) are possible, especially for better corrosion resistance.
It is also possible to mark the height of the shear pins (25) with different colors or other markings for easier assembly.

Due to the space between the cage (30) and finger plate (20), it is also possible to install in the angle section (40) to the roadway (60) through slots that are used for drainage. As a result, in a gradient water, which collects between different road layers and flows towards the parting line can be derived in a targeted manner. This avoids the risk of freeze breakage or other moisture damage, as the moisture can be safely removed via the drainage profile in the middle of the transition.

Due to the more precise positioning of the support surfaces and the defined preload, the system tends less to oscillate, which is beneficial for the longer durability, since the system fatigues less quickly.

As soon as the screws with the washers are inserted above the middle position for the corresponding fastening positions, with the sealing insert both screws are aligned precisely and the pin is inserted and this action was carried out for all fastening positions of the respective finger plate (20), the finger plate (20) Place the washers in place and fasten the nuts on the mounting kit (10) to the bolt and tighten to torque.
Are all nuts tightened and the transition thus completed, the remaining upper openings are poured with a potting plan to the finger plate (20) and the road surface (60) so that no moisture, especially no salt water can penetrate.

Although it does not comply with the valid standard, but of course in the subject mounting arrangement and the nut and the washer in the grooves described in the cage (30) are inserted and after optional introduction of a seal and / or a bolt, the finger plate (20) tightened at the top with the screws become. This also makes it easier to change as compared to the current state of the art possible.

In the area of the contact surface between the finger plate (20) and the cage (30), the finger plate (20) can be offset by 0.5 to 5 mm, so that the finger plate (20) is 0.5 to 5 mm thicker in the area of the free expansion joint ,
The transition is to harmonize as a radius or chamfer to avoid a notch effect. By the supernatant of the finger plate (20), the risk is reduced, that in light movements between the finger plate (20) and cage (30) by a suction or capillary moisture, in particular salty air moisture between cage (30) and finger plate (20) retracted which would lead to corrosion and therefore must be avoided.

In the case of redevelopment, for example, if individual fingers of the finger plate (20) are broken, material fatigue occurs or there is a risk of breakage, etc., first the potting compound is removed. Then all nuts are removed and the finger plate (20) can be lifted off. After removing the bolt and the seal, the individual screws can be removed easily, quickly and without tools via the center hole and replaced with new screws.
The assembly is again in reverse order, or as previously described. Due to the possibility of using shear pins (25) with different heights, it is easy to adjust to different heights to the track (60).

Thus, with the inventive design of the mounting arrangement a standardized connection succeeded because the mother of the mounting set (10) is acted upon by torque, and further a simple and rapid replacement possibility of the entire mounting set (10) in case of maintenance is possible.
This was the goal of the invention.

REFERENCE NUMBERS:

10

..... mounting kit

20

..... finger plate

25

..... pushthorn

30

..... Cage

40

..... fastening strap

41

..... Reinforcing iron

50

..... angle profile

60

..... road surface

Claims (15)

1. Road joint, consisting of a cage (30) and a finger plate (20) which is screwed thereon by means of at least one fastening fitting (10), characterised in that the screw and a washer of the fastening fitting (10) are inserted into at least one groove in the cage (30) which has a plurality of different widths for receiving the screw head, the washer and the screw shank, in that the screw head is positioned non-rotationally in the groove and in that the tightening torque is applied by means of the nut of the fastening fitting (10).
2. Road joint as claimed in claim 1, characterised in that the respective width of the groove has an excess of 0.2 to 3 mm with respect to the width of the screw head, the washer and the screw shank.
3. Road joint as claimed in claim 1 or 2, characterised in that the screw and a washer are introduced from above via a bore which extends perpendicularly to the grooves provided.
4. Road joint as claimed in any one of claims 1 to 3, characterised in that a seal is introduced between the cage (30) and the finger plate (20).
5. Road joint as claimed in any one of claims 1 to 4, characterised in that the seal has a sealing plate with a specific outer geometry and apertures for screws and possibly bolts.
6. Road joint as claimed in any one of claims 1 to 5, characterised in that the seal is inserted in the cage (30) positioned in a slight recess and the seal, for its part, positions the screw.
7. Road joint as claimed in any one of claims 1 to 6, characterised in that in order to absorb shear forces, a shear pin (25) is introduced between the cage (30) and the finger plate (20).
8. Road joint as claimed in at least one of claims 1 to 7, characterised in that this shear pin (25) has a rectangular cross-sectional geometry which is rounded off at the short sides.
9. Road joint as claimed in at least one of claims 1 to 8, characterised in that the cross-sectional geometry of the shear pin (25) is configured as a recess both in the finger plate (20) and in the cage (30).
10. Road joint as claimed in at least one of claims 1 to 9, characterised in that the recess in the finger plate (20) and in the cage (30) is between 2 and 30 mm, preferably between 2 and 10 mm.
11. Road joint as claimed in any one of claims 1 to 10, characterised in that the free intermediate space between the finger plate (20) and the cage (30) is between 0 and 200 mm, preferably between 5 and 130 mm.
12. Road joint as claimed in any one of claims 1 to 11, characterised in that the shear pin has a height between 4 and 260 mm.
13. Road joint as claimed in any one of claims 1 to 12, characterised in that the shear pins (25) of different heights are colour-marked.
14. Road joint as claimed in any one of claims 1 to 13, characterised in that the entire fastening fitting (10) can be replaced without any drilling, milling or welding work.
15. Road joint as claimed in any one of claims 1 to 14, characterised in that the finger plate (20) is thinner by 0.5 to 5 mm in the region of the contact surface with the cage (30).

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