DE1658628A1 - Elastic cover for expansion joints on road bridges - Google Patents

Description

Etienne Sequaris Andrimont, Belgium

Elastic cover for expansion joints on road bridges

The invention relates to one consisting of an elastic strip Device for covering and sealing expansion joints on road bridges and other civil engineering structures.

It is known that road bridges of a certain size and similar structures must be equipped with expansion joints. The need for the continuity of the roadway at these points ensuring poses difficult-to-solve problems. These problems are due to the fact that one is forced to to attach an elastic and abrasion-resistant element there, the type of which corresponds to the road. The material used must therefore be able to follow the width fluctuations of the joint and ensure sufficient tightness against rainwater.

Many proposals have already been made for solving these problems, e.g. the use of bitumen, asphalt and similar materials. Although these materials are relatively pressure-resistant, they only have a mediocre elasticity and yield therefore only an imperfect seal if the joint begins to widen. Rubber and the elastomers lead to better ones Results and are generally used. Their resistance to abrasion and weathering is satisfactory, however it is difficult to apply these materials properly.

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According to another proposal (British Patent 923,969) strips or juxtaposed sheets of rubber or other are made synthetic, elastic materials are used, which are pressed between metal profiles, which are on both sides of the through the joint is attached to separate components. The fact that the elastic material is only used under pressure is limited on the one hand the application possibilities and on the other hand it leads to to the fact that leaks occur in the event of strong contractions of the structure, as is generally not feasible for projects of a certain size and great difficulties arise when laying when a strong compression of the elastic material is achieved shall be. In addition, the profile bodies can only be compressed to a limited extent will; they can become too stiff and have an undesirable effect on the structure or bulge excessively upwards, there is a risk that they will come out of their storage. In addition, you can use the previously used elastic profiles certain embodiments of connecting profiles are not realized, in particular to the right of Watercourses. One is then forced to lay sections of such strips or plates next to one another in order to create these desired profiles to realize; this leads to a large number of joints that can only have a low level of tightness.

The device according to the invention for covering expansion joints avoids these disadvantages. On the one hand, she speaks both on contraction as well as on dilation, on the other hand it consists of a single piece, the length of which is that of the one to be closed Expansion joint. Finally, this device can easily be adapted to all variations of the profile of this joint will.

The device according to the invention consists essentially of one Strips of rubber, preferably synthetic rubber, or some other elastic material, such as synthetic elastomers, and embedded in these strips are metal prpfiles that wholly or partially in places where the strip must have a certain longitudinal elasticity, are cut so

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the strip coiled or variations in the profile of the roadway can be customized. These metal profiles are used in an advantageous manner Way of attaching fasteners ^ such as bolts or similar elements that secure the strip with metallic Discs or mounting plates is connected, each with the two components separated by the expansion joint are firmly connected. The elastic strip advantageously has variations in cross-section and profile, which in addition serve to facilitate lateral expansions and contractions.

The elastic strip can be attached directly to any of the structural parts, but these parts are advantageous be prepared superficially at the point of contact with the strip.

It has been found that in the case of the use of an elastic strip of considerable size, any tendency to bulge under it the effect of heavy loads due to the presence of reinforcing elements, advantageously metal strips, avoided is, each of which rests against a stool of the elastic strip, and their possibly raised edges in Grooves engage along these humps, these metal strips being fastened by screws or other means. In the event of strong contraction of the elastic strip presses the edge of the metal disc against the bottom of the corresponding groove Forces that try to push the pane back against the ground. In this way, each lifting of the elastic Stripes prevented.

The elastic strip is attached to the structure with the help of two transverse metal or other profiles Material, which preferably have the shape of a T and partially or completely at the points where the strip has a certain Must have longitudinal elasticity, are incised. These profiles are partially embedded in the strip, and the rest Parts of these profiles are, which is a characteristic advantage of the invention ie *, with a thin layer of rubber or the other elastomer forming the strip. These

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Rubber slice ensures a secure seal between the Profiles and the relevant component. It also protects the profile from corrosion. In the case of smaller stripes or very narrow strips, for example during manufacture of immovable joints, all these metal disks can be omitted and the cross sections can be in the shape of an L.

The invention will be further elucidated from the following Description and drawings, which show some embodiments of the invention without restricting the same, explained in more detail.

Figure 1 is a cross-section through a very large strip with intermediate supports and the central reinforcing disc.

Figure 2 is a longitudinal section through one of the transverse fastening profiles Ä.

FIG. 3 is a cross-section through a large strip which lies directly on top and is connected with joint elements. Figure 4 is a cross-section through a narrower strip without a reinforcing disc, and

Figure 5 is a section through a narrow strip, e.g. is used for immovable expansion joints.

According to Figures 1 and 2 form the bridge deck 1 and the land bridge 2 between them in a known manner the expansion joint 3 and are non-positively connected to metal plates 4 and 5 via sprue bolts 6. These plates have bores for the bolts 7, 8, the heads of which are advantageously carried out by a welding bead or by a welded bead Welding points are kept in the direction of rotation. These bolts 7,8 are used to attach the elastic strip 10. On one of the Metal plates, for example the plate 4, lies a plate 11 which is gripped by the bolt 7 and which covers the joint 3 and rests on the Plate 5 hangs up. Another plate 12 grasped by the bolt 8 lies on the plate 5. The two plates 11 and 12 have the same thickness so that they form an exactly horizontal support surface. The elastic strip has approximately the shape in cross section of a plate! fctpezes, the upper surface of which falls into this trap the large base area has two very flat indentations 13 in the longitudinal direction; It is also advantageous

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provided with small grooves or anti-skid grooves 14. The lower surface of the strip has two supports 15 in the transverse direction, in which the anchoring profiles 16 are partially embedded, which advantageously have a white T-shape, the top plate in The bottom layer of these supports is and the web is embedded in the strip. Each of these supports is followed by one Cavity 17 and then a hump 18, which exactly at the location of the Corresponding indentation 13 is located “This closes again a cavity 19 which encloses a central hump 20. In this hump metal discs 21 are embedded with a equipped with an internally threaded bore. Metal strip 22, consisting of a flat central web and two wings 23, the thickness of which is steadily decreasing and which are advantageously rounded at the outer edge, engage in the corresponding Cavities and are fastened to the strip 10 by means of screws 24 which sit in the thread of the washers 21, in such a way that its central web presses against the underside of the central hump 20, while the wings 23 engage in the cavity 19. The dimensions the metal strips 22 are such that when the strip 10 is in the unloaded state, its lower surface is within the circumference the underside of the hump 20 lies while the ends of each wing 23 are near the angle that is being formed from the bottom of the cavity 19 and the wall of the adjacent cusps 18 ″. The elastic strip 10 is fastened by means of the bolts 7 and 8, which are in corresponding holes in the outermost Engage part of each head plate of the profiles 16. The fastening is secured by nuts 25, which are expediently be set by welds or beads 26. You can connect the nuts 25 via steel rods, which on each Nut are welded on, with this steel rod then as Be-r serves as reinforcement for the filler concrete.

The anchoring profiles 16 are cut at certain intervals 27 on the central web and all the intersections 28.

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In the form of exercise according to FIG. 3, the plates 4 and 5 are omitted, since the surface of the bridge covering and the land bridge is sufficiently flat therej the sprue bolts 6 and the bolts 7 are combined into a single element. In this case the metal strips 22 overlie a solid component, e.g. the Land bridge 2.

The device according to FIG. 4 contains the same elements, with the exception of the metal strips 22 and their fastening means.

In the embodiment according to FIG. 5, the strip is a block 10 made of rubber or another elastomer, with a uniform

fe trapezoidal cross-section, with the small base at the bottom. The anchoring profiles 30 consist of angle irons, their vertical X wings, evenly toothed, in the elastic strip are embedded, and the horizontal wings have perforations for the fastening bolts.

To attach the device according to FIGS. 1 and 2, the length fluctuations of the bridge and thus the width of the joint are determined beforehand determined as a function of the temperature. As a result, the distance to be provided between can be found with sufficient accuracy the bolts 7 and 8, i.e. the area which, under the climatic conditions in question, is covered by the elastic strip, which is neither stretched nor tense, is to be covered, It is sufficient to determine the current conditions to determine the

w to determine the distance to be taken into account when laying. The plates 4 and 5 with their bolts can now be connected with the aid of the sprue bolts 6. The intermediate plates 12 and 12 are brought in place and fastened by the bolts 12 and 8. Now you begin to attach the elastic strip 10. This is pushed onto the bolts 7, for example, which are screwed to the nuts 25. If the ambient temperature is exactly the same as at the time the plates 4 and 5 were attached, that is, if the distance between the bolts 7 and 8 is unchanged, the bolts 8 can easily be pushed into the corresponding perforations of the profile 16. If

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if this is not the case, a hydraulic winch can be operated, for example, which either stretches or compresses the strip 10, to tackle their size under the conditions * The fastening is achieved by tightening the 2Euti'sm 25 and possibly by defining them with the help of a welding bead or other methods. Now all you need is the empty space to be filled in between each edge of the strip and the lane of the road, for example by pouring concrete can, as indicated at 29.

The elastic strip according to the invention behaves in the case of changes in the width of the joint as follows: In the case of low temperature, ie, when the structure is contracted, the strip is subjected to a tensile effect and of course remains straight. When the temperature rises, the structure relaxes and the strip is compressed. The ends of the wings 23 press against the angle of the cavity 19 and, when the coapression movement of the strip auliäl ⁴ ; _The forces exerted by the stripe on these wings press the scall stripes 22 against the ground and thus prevent any tendency for the stripe to stand out, as is the case with the known directions.

The other devices described here are attached in the same way *

It is particularly noteworthy that the thin layer of rubber or other material surrounding the profiles 16 opposes them Corrosion protects and ensures a tight seal between the profiles and the underlying material. According to a simplified form of implementation, the reinforcing element be replaced by rigid, interrupted elements, the cross-section of which corresponds exactly to that of the cavity 19 in which this Elements are used. Their effect is then analogous to that of the reinforcement element

Of course, there are different variants with regard to the shape and dimensions of the elements described and the one used Materials possible. For example, the profiles and panels can be made of synthetic material with appropriate properties be, certain plates can be left out and the bolts and screws can be blended into one element.

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Claims (2)

Claims 1 · Device for covering and sealing miter joints Bridges and other structures using an elastic strip made of rubber or another, preferably synthetic Elastomers, characterized in that the elastic strip is effective both in tension and in compression, made of a single one Piece of a length that corresponds to the joint to be covered, has a cross-section in the form of a flat trapezoid, where the small base side is at the bottom, may have variations in cross-section and in the test pattern, through which the tensile and pressure forces are directed downwards, contains profiles made of metal or other material embedded, which at certain intervals are completely or partially interrupted so that the strip is given a certain flexibility in the longitudinal direction, and which at intervals with holes, which may be provided with internal threads, to accommodate fastening bolts are further characterized in that the elastic strip} embedded in a central hump or in several Höoher along The strip contains discs made of metal or some other material, such as synthetic material, which are internally threaded have accidental bores to accommodate metal disks, whose cross-section has the shape of a flat central web with two inclined or straight wings, the thickness of which is steadily decreasing and the outer edge of which is preferably rounded, the central web pressing against the underside of this central hump, while the wings engage in the cavity surrounding this hump and its edge points exactly at the angle formed by the bottom of the cavity and the wall of the adjacent cusp will. 2. Device according to claim 1, characterized in that the parts not embedded in the elastic strip of the Metal profiles are wrapped with a thin layer of the material of the elastic strip. 3. Device according to claim 1 and 2, characterized in that the the profiles have the shape of a T. 4. Device according to claim 1 and 2, characterized in that the profiles have the shape of an L. 1 G 9 8 3 B / 0 3 A 1 ^ ₀ original Leerfeite