JP2543263Y2 - Bridge telescopic device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge expansion and contraction device provided at a joint portion of a bridge girder so as to be extendable and contractible.

[0002]

2. Description of the Related Art FIGS. 7 to 9 show general structures of a bridge. In these figures, 1 is a water surface such as a river or a lake, 2 is a road connected to a bridge on both sides of a river or a lake, 3 is an abutment, 4 is a pier, and 5 is a bridge girder. A railing 6 is erected on both sides of the bridge girder 5. The surface of the bridge girder 5 is paved with asphalt. The surface of the surface pavement 7 descends from the center toward both sides with an inclination of about 2%.

[0003] Then, on the pier 4 or the abutment 3 connecting the bridge girder 5 to the bridge girder 5, the bridge girder 5 or the bridge abutment 3 adjacent to the bridge girder 5 is provided.
A bridge expansion / contraction device 8 is provided at each joint between the two. This bridge expansion and contraction device 8 fills the seam at the end of the bridge girder 5 while allowing horizontal displacement of the bridge girder 5 due to a temperature change or vehicle traffic. In the structural calculation, the stress generated in each bridge girder 5 is reduced. The structure is not transmitted, and is provided for the purpose of smoothly passing a passing vehicle or the like.
The conventional bridge expansion and contraction device 8 has a structure in which, for example, comb-shaped brackets are fixed to end faces of both adjacent bridge girders 5 and the comb teeth of the comb-shaped brackets are alternately meshed. With the horizontal displacement, the two comb-shaped brackets approach or separate from each other while maintaining the engagement of the comb teeth .

However, in the above-described conventional bridge expansion and contraction device 8, since a gap is formed on the surface side of the joint portion at the end of the bridge girder 5, vibration and noise are generated as the vehicle passes through the gap. However, there was a problem that caused discomfort to the local residents and drivers. In addition, the conventional bridge expansion and contraction device 8 as described above is generally made of steel, and has a difference in durability (abrasion resistance) from the pavement 7 made of asphalt on the bridge surface. When there are multiple occurrences, there is also a problem that a step occurs between the pavement portion 7 and the bridge expansion / contraction device 8. Such a step greatly affects the durability of the bridge main body due to an impact load when the vehicle passes through the step.

On the other hand, Japanese Patent Application Laid-Open No. HEI 3-110206 discloses
In the gazette, the seam at the end of the bridge girder is filled with elastic pavement material
So that no gap is formed on the surface side of this joint.
A bridge extension device is described. With this bridge extension device
Is a guide consisting of a plate or bar at the end of the floor slab facing the bridge girder
In addition to projecting each member,
A movable plate such as a steel plate is mounted on the
And the space formed by the floor slab or the pavement on it
It has cast elastic pavement. The movable plate is made of water
It is a flat plate and slidably mounted on the guide member
Sides are inclined walls descending outward
You. And when the gap between floor slabs becomes narrow due to thermal expansion,
The movable plate descends along the guide member, while cooling
When the gap between floor slabs widens, the movable plate guides
Ascend along the member. This makes it possible to fill elastic pavement material.
The filling volume is adjusted so that the pavement is
The state becomes uniform.

[0006]

[Problems to be solved by the invention] However, as described in the above publication,
The bridge expansion and contraction device described above causes displacement at the joint at the end of the bridge girder.
As the movable plate moves up and down,
Moreover, the shape of the movable plate has water with inclined walls on both sides.
Dispersion of displacement is poor due to the flat plate shape
And the fluctuation of the filling volume of the elastic pavement material
However, the distortion that occurs in the pavement material is particularly concentrated at the corners of the base of the sloped wall.
There is a problem inside. Also, inclined walls on both sides of the movable plate
Are on the guide members, and these guide members
The movable plate goes up and down by sliding the inclined wall
However, in reality, the bridge girder also has vertical displacement
It is difficult for the movable plate to move up and down while
New And if the movable plate is tilted, the distortion is more uneven.
And deformation of the surface of the pavement and peeling of the pavement from the floor slab
May also occur.

[0007] The present invention is, bridges telescopic device odor eliminating the gap between the front surface side of the joint portion of the girder end by pavement
This effectively disperses the displacement of the seam at the end of the bridge girder,
For asphalt surface pavement that fills seams
The purpose of the present invention is to ensure that cracks to spread are spread .

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a bridge expansion and contraction device which is provided at a joint of a bridge girder end and fills a joint of the bridge girder end while allowing horizontal displacement of the bridge girder end. a bridge girder and thereto adjacent bridge beam or abutment and the displacement transducer device of both end edges, each consisting of approximately sectional fixed semicircular shape of the elastic plate, pavement consisting of asphalt, which is provided above the displacement transducer device And this pavement
A bridge girder and this displacement dispersion unit which both end edges respectively to the adjacent girder or abutment consists of a horizontal elastic plate which is connected to a position above the parts were set eclipse above the displacement dispersion unit
Asphalt pavement, and these displacement dispersion
Ingredients and a set of paving unit is provided two or more layers, those were <br/> the front surface pavement you continuous surface pavement of the pavement of the top <br/> girder or bridge abutment.

[0009]

According to the bridge expansion and contraction device of the present invention, when a horizontal displacement occurs at the seam at the end of the bridge girder, a substantially semi-circular cross-section in which both ends are fixed to the bridge girder and a bridge girder or abutment adjacent thereto.
I wrinkles displacement transducer device comprising a shape of the elastic plate, heat is horizontal displacement is converted into displacement in the entire radial direction of the semicircular including vertical displacement, the pavement made from above the asphalt
available. Furthermore, converted displacement Te Confucius displacement dispersing devices consisting of horizontal elastic plate connected to the bridge girders or abutment and adjacent to the bridge deck located above the pavement on the displacement transducer device wrinkles Thus, the gas is transmitted to the asphalt pavement on the displacement dispersing device while being more widely dispersed in a plane . Moreover, these displacement dispersing devices and pavement
Since there are two or more sets, the distortion is more effectively spread over a wide range.
Distributed. As a result , cracks generated in the surface pavement at the joint at the end of the bridge girder are diffused. The surface pavement above the displacement dispersion device is continuous with the surface pavement of the bridge girder or abutment, and there is no gap on the surface side of the seam at the end of the bridge girder. Since there is no step due to the difference in wear resistance with the device, problems such as vibration and noise generated when the vehicle passes through the joint are reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Since the configuration of the entire bridge is the same as that shown in FIGS. 7 to 9 already described, the corresponding parts are denoted by the same reference numerals and description thereof will be omitted. The bridge girder 5 has, for example, a floor slab 12 made of reinforced concrete above a main girder 11 made of reinforced concrete, and a surface pavement 7 made of asphalt with an intermediate pavement 13 interposed on the floor slab 12. The end of the bridge girder 5 is supported on the pier 4 via a bearing 14. And this pier 4
Alternatively, a bridge expansion / contraction device 16 is provided at the joint of the bridge girder 5 at the end of the bridge abutment 3 to allow the horizontal displacement of the bridge girder 5 to fill the joint. Next, the configuration of the bridge extension device 16 will be described. In the following description,
Although the bridge expansion and contraction device 16 provided on the pier 4 is taken as an example, the bridge expansion and contraction device 16 provided between the abutment 3 and the bridge girder 5 on the abutment 3 has the same configuration. There is a groove-shaped gap 17 between the lower end faces of adjacent bridge girders 5. In addition, both bridge girder 5
At the end, it is located above the gap 17 and
A first upward surface 18, a second upward surface 19 and a third
There is an upward facing surface 20. These upward faces 18, 19, 20
Has a step shape. Then, both ends of the displacement converter 21 are fixed to the first upward surface 18 of the adjacent bridge girder 5 by concrete anchors 22 so as to cover the gap 17 from above. The displacement converter 21 has a cross section
It consists of a semi-circular arch-like elastic plate, for example, an SGP half-split tube , and changes the horizontal displacement occurring at the joint at the end of the bridge girder in the radial direction of the semi-circular shape including the vertical displacement.
It is converted to a place . The space between the floor slabs 12 above the displacement converter 21 and the first upward surface 18 of both bridge girders 5 is filled with ordinary asphalt to form a special pavement 23. Further, both edge portions of the horizontal plate-shaped first displacement dispersing device 24 are placed on the second upward surface 19 of the adjacent bridge girder 5 so as to cover the pavement portion 23 from above. The first displacement dispersing device 24 is made of expanded metal such as XS-63, has elasticity, and is wider than the displacement converting device 21. The space between the intermediate pavement portions 13 above the first displacement dispersing device 24 and the second upward surface 19 of both bridge girders 5 is filled with ordinary asphalt to form a pavement portion 25. Further, both ends of a horizontal plate-shaped second displacement dispersing device 26 are fixed to the third upward surface 20 of the adjacent bridge girder 5 by concrete anchors 27 so as to cover the pavement portion 25 from above. ing. The second displacement dispersing device 26 is made of expanded metal such as XG-22, has elasticity, and is wider than the first displacement dispersing device 24. The space between the surface pavement portions 7 above the second displacement dispersing device 26 and the third upward surface 20 of both bridge girders 5 is filled with ordinary asphalt to form a surface pavement portion 28. The surface pavement portion 28 of the bridge expansion / contraction device 16 can use a normal bridge surface pavement as it is, and is smoothly continuous with the surface pavement portion 7 of both bridge girders 5.

Next, the operation of the above configuration will be described. A horizontal displacement occurs at the joint at the end of the bridge girder 5 due to a temperature change or vehicle traffic, and the gap 17 between the ends of the bridge girder becomes wider or narrower as shown in FIGS. . The horizontal displacement generated at the joint portion of the girder 5 end is free vertical displacement by a displacement conversion device 21 made of an elastic plate
The Umate displacement transducer device 21 pavement 23 is converted into displacement in the radial direction around axis Ru Den Erare. That is, as shown in FIG. 2, when the gap 17 becomes wide,
Extend downwardly and expand in width. On the other hand, as shown in FIG.
21 is bent upward and shrunk, and its width is reduced. Moreover,
The displacement converter 21 has a substantially semicircular cross section.
The distortion causes the entire contact surface between the displacement converter 21 and the pavement 23 to
Without concentrating on a specific location and direction
Dispersed throughout the semicircular radial direction. In addition,
Converted displacement Te is shop located above the displacement transducer device 21
Expanded metal embedded in the casing 23, 25, 28
When the first and second displacement dispersing devices 24 and 26 are bent, they are transmitted to the upper layers in the pavement portions 25 and 28 while being gradually and widely dispersed even in a plane . Horizontal
Displacement dispersing devices 24 and 26 are more
The direction can be dispersed by the displacement converter 21.
Can be dispersed over a wide area in a plane. And the first
And the width is larger than the first dispersing device 24.
With the second displacement dispersing device 26, the distortion is gradually effected.
Are distributed. As described above, the distortion is caused by the pavement 23, 2
By being dispersed over a wide range of 5, 28, cracks generated in the surface pavement 28 made of asphalt are diffused. In other words, the horizontal displacement generated at the end of the bridge girder 5 is converted and dispersed by the displacement converter 21 and the displacement dispersers 24 and 26, so that the surface of the bridge expansion / contraction device 16 is brought into contact with the surface pavement 7 of the adjacent bridge girder 5. A continuous surface pavement 28 can be formed. And, in this way, the bridge extension device 16
The surface of the bridge girder 5 is a surface pavement 28 made of asphalt that is continuous with the surface pavement 7 of the bridge girder 5. It does not occur on the bridge surface. In addition, since there is no gap on the surface side of the joint portion at the end of the bridge girder 5, problems such as vibration and noise generated when the vehicle passes through the joint portion are reduced. At the same time, the durability of the bridge body is improved. Further, in repairing the pavement, the pavement can be continuously stripped and re-paved on the bridge girder 5 and the bridge expansion device 16, and the construction speed is lower than that of a conventional bridge having no asphalt on the bridge expansion device 8. Is greatly improved.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
The material of the displacement converter and the displacement disperser is not limited to those described above, and deformation such as providing three or more layers of the displacement disperser is also possible. Further, the surface pavement 7 can be formed directly on the floor slab 12 without the intermediate pavement 13.

[0013]

[Effects of the Invention] According to the present invention, the pavement portion of the bridge girder end
Bridge expansion and contraction device with no gaps on the seam side of the seam
Te, to the girder or abutment adjacent to the bridge deck, sectional ho
URN its both end edges of the displacement transducer device comprising a semi-circular elastic plate
And fixed on the displacement converter.
Was composed of a horizontal elastic plate located above the pavement displacement dispersing devices both end edges of connecting each and the displacement dispersion unit
Since a set of the upper pavement of its provided two or more layers, the bridge girder end
The horizontal displacement occurring at the joint of
The semi-circular release without concentrating on position and direction
Dispersed in the entire shooting direction
Distributed over a wide area and therefore the seams at the end of the bridge girder
The surface pavement made of asphalt that fills the
Racks can be reliably spread.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a bridge expansion and contraction device of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where a gap between ends of the bridge girder is widened.

FIG. 3 is a longitudinal sectional view showing a state where a gap between ends of the bridge girder is narrowed.

FIG. 4 is a plan view of the displacement converter.

FIG. 5 is a plan view of a first displacement dispersing device according to the first embodiment;

FIG. 6 is a plan view of a second displacement dispersing device according to the first embodiment;

FIG. 7 is a side view of the entire bridge.

FIG. 8 is a plan view of the same.

FIG. 9 is a cross-sectional view of the same.

[Explanation of symbols]

3 Abutment 5 Bridge girder 7 Surface pavement section 16 Bridge expansion and contraction device 21 Displacement converter 23 Pavement section 24 First displacement disperser (displacement disperser) 25 Pavement section 26 Second displacement disperser (displacement disperser) 28 Surface pavement section

Claims (1)

(57) [Scope of request for utility model registration] 1. A bridge expansion and contraction device provided at a seam portion of a bridge girder end to fill a seam portion of the bridge girder end while allowing horizontal displacement of the bridge girder end, wherein both ends of a bridge girder and a bridge girder or abutment adjacent thereto are respectively provided. a displacement conversion tool but consisting substantially fixed cross-sectional semi-circular shape of the elastic plate, and a pavement made of asphalt that is provided above the displacement transducer device, this pavement
A bridge girder and this displacement dispersion unit which both end edges respectively to the adjacent girder or abutment consists of a horizontal elastic plate which is connected to a position above the parts were set eclipse above the displacement dispersion unit
Asphalt pavement, and these displacement dispersion
Ingredients and a set of paving unit is provided two or more layers, bridges, characterized in that there was <br/> the front surface pavement you continuous surface pavement of the pavement of the top <br/> bridge girder or abutment Telescopic device.