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Title:
EXPANSION JOINT FOR ROAD STRUCTURES AND CONSTRUCTION METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2017/203548
Kind Code:
A1
Abstract:
The present invention concerns an expansion joint for road structures such as viaducts, bridges, highway overpasses and the like, said road structures being of the type comprising at least two beams (T1, T2), covered with a slab (B) and arranged side by side in such a way as to form a discontinuity (D), said joint comprises at least one first layer (1), comprising a plate, suitable to be disposed on said slab (B) across said discontinuity (D), at least one second layer (2), suitable to be disposed above said first layer (1), comprising inert material, and at least one third layer (3), suitable to be disposed above said second layer (2), comprising bituminous conglomerate. The present invention also concerns to a method for realizing said joint.

Inventors:
ROBERTIELLO, Vincenzo (Via San Gerardo 1, Vietri di Potenza, 85058, IT)
Application Number:
IT2017/000103
Publication Date:
November 30, 2017
Filing Date:
May 23, 2017
Export Citation:
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Assignee:
TANTONE, Rossella (Via Olmi 88, Ferrandina, 75013, IT)
ROBERTIELLO, Vincenzo (Via San Gerardo 1, Vietri di Potenza, 85058, IT)
International Classes:
E01D19/06
Foreign References:
EP0506196A11992-09-30
FR2696764A11994-04-15
Attorney, Agent or Firm:
IANNONE, Carlo Luigi (Barzano' & Zanardo Roma S.p.A, Via Piemonte 26, Roma, 00187, IT)
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Claims:
CLAIMS

1. Expansion joint for road structures such as viaducts, bridges, highway overpasses and the like, said road structures being of the type comprising at least two beams (T1 , T2), covered with a slab (B) and arranged side by side in such a way as to form a discontinuity (D), said joint comprises:

at least one first layer (1), comprising a plate, suitable to be disposed on said slab (B) across said discontinuity (D),

at least one second layer (2), suitable to be disposed above said first layer (1), comprising inert material, and

at least one third layer (3), suitable to be disposed above said second layer (2), comprising bituminous conglomerate.

2. Joint according to the preceding claim, characterized in that said plate of said at least one first layer (1) comprises steel or metallic alloys.

3. Joint according to anyone of the preceding claims, characterized in that said plate has a thickness that varies in a range of 1-3 cm, preferably 2 cm.

4. Joint according to anyone of the preceding claims, characterized in that said inert material of said at least one second layer (2) is of type crushed having a thickness, which varies in a range of 6-10 cm.

5. Joint according to anyone of the preceding claims, characterized in that said third layer (3) comprises chemical elasticizing additives.

6. Joint according to anyone of the preceding claims, characterized in that said bituminous conglomerate of said at least one third layer (3) has a thickness which varies in a range of 4-8 cm.

7. Method for carrying out an expansion joint for road structures such as viaducts, bridges, highway overpasses and the like, said road structures being of the type comprising at least two beams (T1 , T2), covered with a slab (B) and arranged side by side in such a way as to form a discontinuity (D), according to anyone of the preceding claims, characterized in that said method comprises the following steps:

- applying a first layer (1), comprising a steel plate or metal alloys plate, on said slab (B);

- applying a second layer (2), comprising inert material, on said first layer (1);

- applying a third layer (3), comprising bituminous conglomerate and chemical elasticizing additives, on said second layer (2).

Description:
Expansion joint for road structures and construction method thereof

*****

The present invention relates to an expansion joint for road structures.

The present invention also relates to a method for making and mounting said expansion joint.

More specifically, the invention relates to an expansion joint of the mentioned type, studied and realized in particular for the installation under the road surface of viaducts, bridges, highway overpasses and the like in the intermittent sections or intermediate points, but which can be used for any surface of the road, of which the function of joining tracts of discontinuity is necessary.

In the following, the description will be directed to an expansion joint for motorway viaducts and to a method for its construction and assembly, but it is clear that the same should not be considered limited to this specific use.

As it is well-known, road structures, such as a highway viaduct, are realized by a mainly horizontal development structure of named scaffold, comprising a plurality of layers.

The first layer on which vehicles pass is the street cover under which there is a slab covering a plurality of beams.

The beams are contiguous and departed to each other in correspondence of intermediate points, in which the thermal dilation and contraction of the beams of a road section, caused by daily and seasonal temperature excursions.

At said intermediate points, said road structures comprise shoulders, piles or pilasters or pillars, which are predominantly vertical development elements for supporting said scaffold.

The section between a pylon and the next one is called span.

The expansion joint is generally installed at these intermediate points and at the ends of the beams, which are a linear cross-sectional interruption of the road surface, within which the length variation of the beams supporting the scaffold occurs. In particular, the expansion joint is installed between two contiguous sections of the road surface in correspondence of the pylon that supports two contiguous sections.

This interruption is then covered by suitable joint-covers, to allow the section to be crossed.

Since these joint-covers are not perfectly coplanar to the road surface, they are protruding from the road surface causing the jump of the vehicle passing on the road surface.

Consequently, in correspondence of the joint, vehicles undergo considerable dynamic stresses, which often result in the damage to the joint with a progressive decrease in the quality of road traffic.

To the damage described above adds the poor maintenance to which such joints are ordinarily subjected.

The result of the non-optimal configuration of the expansion joint according to the prior art implies a greater probability of the loss of vehicle control and the consequent risk of accidents.

In addition, the heavy vehicles jump in correspondence of said expansion joints, undergoes said pylons positioned at said intermediate points at a mechanical stress, which over the time causes damage to the beam-pylon system.

In the light of the above, it is an object of the present invention to provide an expansion joint that does not cause discontinuities in the highway road surface.

A further object of the present invention is to provide an expansion joint easy to realize.

It is therefore a specific object of the present invention an expansion joint for road structures such as viaducts, bridges, highway overpasses and the like, said road structures being of the type comprising at least two beams, covered with a slab and arranged side by side in such a way as to form a discontinuity, said joint comprises at least one first layer, comprising a plate, suitable to be disposed on said slab across said discontinuity, at least one second layer, suitable to be disposed above said first layer, comprising inert material, and at least one third layer, suitable to be disposed above said second layer, comprising bituminous conglomerate.

Further according to the invention, said plate of said at least one first layer comprises steel or metallic alloys.

Preferably according to the invention, said plate has a thickness that varies in a range of 1-3 cm, preferably 2 cm.

Still according to the invention, said inert material of said at least one second layer is of type crushed having a thickness which varies in a range of 6-10 cm.

Always according to the invention, said third layer comprises chemical elasticizing additives.

Further according to the invention, said bituminous conglomerate of said at least one third layer has a thickness, which varies in a range of 4-8 cm.

It is further object of the present invention a method for carrying out an expansion joint for road structures such as viaducts, bridges, highway overpasses and the like, said road structures being of the type comprising at least two beams, covered with a slab and arranged side by side in such a way as to form a discontinuity, according to anyone of the preceding claims, characterized in that said method comprises the following steps:

- applying a first layer, comprising a steel plate or metal alloys plate, on said slab;

- applying a second layer, comprising inert material, on said first layer;

- applying a third layer, comprising bituminous conglomerate and chemical elasticizing additives, on said second layer.

The present invention will be now described, for illustrative but not limitative purposes, according to its preferred embodiments, with particular reference to the figures of the enclosed drawings, wherein:

figure 1 shows a top view of a highway viaduct;

figure 2 shows a side view of figure 1 ;

figure 3 shows an axonometric view of figure 1 ;

figure 4 shows a front view of the expansion joint of the present invention;

figure 5 shows a detail of figure 4; and

figure 6 shows a detail of figure 4 during the expansion and contraction of the road structure.

In the various figures, similar parts will be indicated by the same reference numbers.

Referring to figures 1 to 3, a viaduct V comprises a horizontal developed element, called scaffold I, supported by a plurality of pillars P1 , P2, Pn having a predominant vertical development.

Referring now to figures 4 and 5, the scaffold I comprises a plurality of layers.

The first layer A is the road surface, on which the vehicles pass, the second layer B being the slab, the third layer C comprises a plurality of adjacent beams T1 , T2, Tn, and interrupted at intermediate points D of discontinuity.

Said pillars P1, P2, Pn are fixed in correspondence of said discontinuity points D.

The expansion joint of the present invention is included in the first layer A of said scaffold I.

In particular, said expansion joint comprises in its turn a plurality of layers.

The first layer 1 is a steel or metal alloys sheet having a thickness varying within a range of 1 to 3 cm, preferably 2 cm, which is positioned on said slab B at said intermediate point D.

Said layer 1 may not be fixed to said slab B, or fixed only on one side in case of a road inclination, so as to allow expansion and shrinkage of said beams T1 , T2, Tn due to the thermal excursion.

The second layer 2 comprises crushed inert material, called "quarry mixture", having a thickness varying in a range of 6 to 10 cm and extending over said layer 1 and throughout the length of the span.

Said layer 2 compensates the deformations induced by the expansion and the contraction of said beams T1 , T2, Tn in the span portion in which said layer 1 is not present. The third layer 3 is the road surface comprising a bituminous conglomerate of about 4-8 cm thickness and elasticizing chemical additives.

To install this expansion joint on a motorway viaduct, removing the original road cover, until the layer of the slab B is reached, is necessary.

Subsequently, said first 1 , second 2 and third 3 layer are positioned on one another, on said discontinuity point D.

As it can be seen from the foregoing description, said expansion joint allows to cover discontinuity points highway viaducts and the like, preventing the overhang on the road surface on which vehicles pass.

The present invention has been described for illustrative but not limitative purposes, according to its preferred embodiments, but it is to be understood that modifications and/or changes can be introduced by those skilled in the art without departing from the relevant scope as defined in the enclosed claims.