JP2669802B2 - Road bridge extender - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road bridge expansion / contraction device constructed at a seam of a road bridge.

[0002]

2. Description of the Related Art As a road bridge expansion / contraction device, a device called a steel finger joint is generally known. This is composed of a pair of base plates having flat plate surfaces, a pair of web plates standing on each base plate and facing each other with vertical plate surfaces, and fixed to the upper end of each web plate. And a pair of face plates with their sides lying. The pair of base plates are fixed to the steel girders of the opposite road bridge ends, and the pair of face plates have finger portions protruding toward the other side, and the finger portions are meshed with each other to form a road surface. , Concrete is later placed on the back of the web plate (see FIG. 5 of JP-A-6-280215).
reference).

[0003]

However, the above-mentioned steel finger joint is a so-called horizontal finger joint with its face plate lying down. Therefore, when the load of the automobile is applied to the tip of the finger portion of the face plate, excessive stress is concentrated on the root of the finger portion or the joint portion between the face plate and the web plate,
There is a problem in that the finger portions may be broken, or the face plate may be damaged such as coming off the web plate. Also, the face plate is T on the web plate.
It is fixed in the shape of a letter, and the part on the opposite side of the finger part projects to the back part of the web plate. For this reason, steel finger joints are said to be highly durable if they are completely installed,
It was difficult to apply it to long bridges with expansion and contraction exceeding 100 mm or 200 mm.

The face plate has a thickness of 30.
However, in the event of an earthquake that combines vertical and horizontal vibrations, the meshing of the face plate fingers that face each other will disengage vertically during vertical vibration, and the subsequent horizontal motion will cause mutual finger movements. The meshing position of the parts may shift laterally. This lateral slip is a lateral slip between the road bridges facing each other, which causes a large damage of the road bridge, and makes it difficult to quickly recover after the fact.

[0005]

In order to solve the above problems, the present inventor has repeated trial manufacture and examination of joints, and instead of forming finger portions for receiving a load of an automobile by a horizontal type face plate as in the conventional case, It has been found that, if it is formed by a vertical plate, high load-bearing strength and high vibration resistance can be obtained in the finger portion, and that it can be applied to the above long bridge, and the present invention has been completed. In other words, a vertical finger joint is not provided.

That is, the invention according to claim 1 is a road bridge expansion / contraction device constructed at a seam of a road bridge, which is fixed to an end portion of an opposing road bridge or an end portion of an opposing road bridge and an abutment. , A pair of web plates facing each other extending in the seam longitudinal direction and having vertical plate surfaces, and alternately facing the opposite side from each of the opposing inner surfaces of the pair of web plates at intervals in the seam longitudinal direction. projects and a number of longitudinal fingers plate plate surface becomes vertical Te, the web
The top of the plate should be compatible with the finger plate above.
Made by cutting out that part notch is formed, the web
The tops of the plates and finger plates form the road surface, and the back of the web plate has concrete on the road surface.
It is cast to form the concrete and
Is also placed in the notch, and the concrete and
Web plate and finger plate are on the road surface
It is characterized in that a concave and convex boundary line is formed .

According to a second aspect of the present invention, in the road bridge expansion / contraction device according to the first aspect, each of the web plates is erected on a base plate with its plate surface lying. It is fixed to the end portion or abutment of the road bridge, the lower end of each of the vertical finger plates is supported by the portion of the base plate on the side of the seam between the web plates, and the portion on the tip side of the supporting portion. It is characterized in that it is higher than the upper surface of the base plate.

[0008]

In the invention according to claim 1, since the fingers are formed by the vertical finger plates whose plate surfaces are vertical, the vehicle load applied to the vertical finger plates is not supported only by the upper end portion of the web plate, It is possible to support the web plate in a wide range above and below the web plate, so that a finger having high load-bearing strength can be formed. Moreover, the problem of insufficient concrete pouring unlike the case of the conventional face plate does not occur.

Since the pair of vertical finger plates facing each other are vertical, they do not come out of mesh with each other even if they move up and down by a relatively large amount due to an earthquake. It does not move due to shaking. This means that the road bridge expansion and contraction device has a function of preventing a lateral displacement of the road bridge and a damage due to the lateral bridge during an earthquake.

Further , the above concrete and web plate
The boundary between the finger plate and the finger plate is uneven on the road surface.
Since the boundary lines are formed, the concrete is worn out and
A step is created between the web plate and finger plate.
Even if it is turned on, the running performance of the car will not be significantly reduced.

According to the second aspect of the invention, the vehicle load applied to each vertical finger plate is received at the portion of the base plate projecting toward the seam clearance side of the web plate, which is advantageous in obtaining high load bearing strength. The part of the vertical finger plate that projects forward from the base plate can advance above the mating base plate, and does not hinder the meshing of the finger plates.

[0012]

According to the first aspect of the present invention, a plurality of vertical finger plates each having a vertical plate surface are projected from each of the facing inner surfaces of a pair of web plates facing each other, and the upper ends of the finger plates are projected. Along with the road surface height to form a vertical finger joint ,
REIT and the above web plate and finger plate
Applied but it is so arranged to form a concave-convex shape of the boundary line in the road surface, the running of the high rather vehicle load strength is good, moreover vertical finger joint having excellent vibration resistance can be obtained, the expansion amount is small road bridge Not only can you
The effect is that it can be applied to long bridges.

According to the second aspect of the present invention, each of the web plates is erected on a base plate whose plate surface lies sideways, and each of the vertical finger plates is provided at a portion of the base plate closer to the seam than the web plate. Since the lower end of the base plate is supported and the portion of the lower end on the tip side of the support portion is higher than the upper surface of the base plate, the load bearing strength of the finger plate can be increased without hindering the engagement of the finger plates by the base plate. , It will be more advantageous for application to long bridge.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a road bridge (steel bridge) in which a floor slab 3 is placed on a steel girder 2, and the road bridges 1, 1 are connected with a seam clearance (girder clearance) 4 present. ing. As shown in FIG. 2, the road bridge expansion / contraction device includes a pair of base plates 5,
5, a pair of web plates 6, 6 erected on the base plates 5, 5 and a large number of vertical finger plates 7, 7, ... Which protrude above the seam gap 4 from each web plate 6, 6. It becomes.

The base plates 5 and 5 are formed of steel plates with their plate surfaces laid sideways and extend in the longitudinal direction of the seams of the road bridges 1 and 1, and each of them is provided with high strength bolts at the ends of the steel girders 2 and 2. Fixed.

The web plates 6 and 6 are formed of a steel plate having a vertical plate surface and extend in the seam longitudinal direction.
An intermediate portion of the width of the base plates 5 and 5 (a central portion or a position shifted left and right from the central portion)
It is erected in. A rib plate 8, 8,... Is connected to the back surface of each web plate 6 and the upper surface of the base plate 5 at the back of the web plate 6. The rib plates 8, 8, ... have rounded upper rear corners and are provided at intervals in the seam longitudinal direction. Also, from the back of the web plate 6 to the anchor 9
Protrude, and the anchor 9 is buried in the floor slab concrete.

The finger plates 7, 7, ... Are formed of steel plates having vertical plate surfaces, and are alternately mated with each other at intervals in the longitudinal direction of the seam from the inner surfaces of the web plates 6, 6 which face each other. It protrudes toward the side.
The finger plates 7 projecting from the one web plate 6 and the finger plates 7 projecting from the other web plate 6 are meshed with each other with a gap therebetween.

The back of the finger plate 7 is joined to the inner surface of the web plate 6, and the lower end thereof is connected to the web plate 6 of the base plate 5 by a joint gap 4.
It is joined and supported on the upper surface of the side portion, and its upper end is aligned with the road surface height. Further, the lower end of the portion of the finger plate 7 protruding from the base plate 5 into the seam gap 4 gradually becomes higher toward the front.

Further, at the upper end of the web plate 6,
As shown in FIGS. 3 and 4, a notch 12 is formed by notching a portion corresponding to the finger plate 7 in a rectangular shape, and floor slab concrete is poured into the notch 12.

Therefore, in the above road bridge expansion / contraction device,
Since the vertical fingers are formed by the vertical finger plates 7 and the back and lower ends of the vertical finger plates 7 are joined to the web plate 6 and the base plate 5, the load of the automobile applied to the vertical finger plates 7 is applied to the web plates 6. In addition to being supported by a portion extending over the entire height, it is also supported by the base plate 5. Therefore, the road bridge expansion / contraction device can be said to be a vertical finger joint having high load bearing strength. Of course, when the opposing vertical fingers are in mesh,
The vehicle can pass through the joint of the road bridge from one vertical finger to the other vertical finger without causing the wheels to fall, and good running performance can be obtained.

Further, floor slab concrete 3 is cast in notches 12 provided at intervals in the longitudinal direction of the seam at the upper end of the web plate 6, and a rib plate 8 is provided at the back of the web plate 6. Therefore, as shown in FIG. 4, the boundary between the upper part of the floor slab concrete 3 and the road bridge expansion / contraction device has an uneven shape. Therefore, even if the floor slab concrete 3 is worn, even if there is a step between the floor slab concrete 3 and the road bridge expansion / contraction device, the boundary line has an uneven shape, so that the drivability of the vehicle is not significantly reduced. Absent.

Further, although the rib plate 8 reinforces the expansion / contraction device, even if the floor slab concrete 3 is worn and the rib plate 8 projects, the upper rear end thereof is rounded. Therefore, even if the snow removal scraper of the snow removal vehicle hits the rib plate 8 in the snowy area, the scraper is guided to the rib plate 8 by the roundness, the expansion device is not subjected to a large impact, and the damage by the scraper is prevented. Is prevented.

Road bridges 1, 1 facing each other due to the earthquake
Even if there is a large relative vertical movement, the vertical finger plates 7, 7 have vertical plate surfaces, and the meshing width thereof is thick in the vertical direction. Therefore, the mutual meshing does not occur. For this reason, even if the road rolls continuously, the road bridges 1, 1 are mutually connected to the vertical finger plates 7, 7.
It is possible to prevent lateral displacement due to the mutual contact. Accordingly, damage to the road bridge is reduced, and subsequent recovery is facilitated.

Although the rib plate 8 has a rounded upper rear end, the rib plate 8 may not be rounded.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where a road bridge expansion / contraction device is installed at a road bridge joint portion.

[Figure 2] Plan view of the road bridge expansion and contraction device

[Figure 3] Rear view of the road bridge expansion and contraction device

FIG. 4 is a partially omitted perspective view showing a state in which the road bridge expansion / contraction device is installed at a road bridge joint.

[Explanation of symbols]

 1 Road bridge 2 Steel girder 3 Floor slab 4 Seams 5 Base plate 6 Web plate 7 Vertical finger plate 8 Rib plate 9 Anchor 12 Notch

Claims (2)

(57) [Claims] 1. A road bridge expansion / contraction device constructed at a seam of a road bridge, the device being fixed to an end of an opposing road bridge or an end of an opposing road bridge and an abutment, each extending in a longitudinal direction of the seam. A pair of web plates facing each other having vertical plate surfaces, and alternately projecting toward the mating side from each of the opposing inner surfaces of the pair of web plates at intervals in the joint longitudinal direction, and the plate surfaces extending vertically. It has a number of vertical finger plates, and the finger plate is at the top of the web plate.
It is cut away and becomes cutout forming a portion corresponding to the upper end of the web plate and finger plate to form a road surface, forming a concrete road surface on the back of the web plate
And the concrete is
It is also placed in the notch, and the concrete and
The bump plate and finger plate are concave on the road surface
A road bridge expansion / contraction device characterized by forming a convex boundary line . 2. The road bridge expansion / contraction device according to claim 1, wherein each of the web plates is erected on a base plate whose plate surface lies down and fixed to an end portion or an abutment of the road bridge. The lower end of each of the vertical finger plates is supported by a portion of the base plate that is closer to the seam than the web plate, and the portion on the tip side of the supporting portion is higher than the upper surface of the base plate. A road bridge expansion and contraction device characterized in that