JP3310951B2 - Damping bridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping bridge for suppressing vibration of a bridge caused by wind or the like.

[0002]

2. Description of the Related Art A bridge has a unique vibration mode and frequency depending on various parameters such as a cross-sectional shape, a structure, and a bridge length of a bridge girder. When the wind blows, it may vibrate at a specific vibration mode and frequency. This vibration may be sufficiently studied in wind tunnel experiments etc. at the bridge design stage, but especially for small and medium-sized bridges, it is said that the possibility of vibration is low, Is not always sufficient. For this reason, the occurrence of vibration may be a problem during or after construction of the bridge .

FIG. 8 shows a conventional method for damping this vibration. As shown in FIG. 8, in the conventional bridge 01, the bridge
During the construction of the beam , a dynamic damper (TMD: Tuned Mass Damper) 02 as a vibration damping member was retrofitted near the center of the bridge girder, thereby suppressing vibration.

[0004] However, after the bridge is completed, it is necessary to regulate a part or all of the traffic of vehicles for the work of installing the dynamic vibration absorber (TMD) 02. Also,
Even if it is determined that a dynamic vibration absorber is necessary during construction, the construction will be stopped for installation, and there is a problem that the construction period will be significantly changed. Further, depending on the bridge girder structure, it may not be possible to secure a space in which the dynamic vibration absorber (TMD) 02 can be installed.

[0005] In view of the above problems, an object of the present invention is to provide a damping bridge capable of quickly suppressing the vibration of the bridge caused by wind or the like even after the bridge is completed.

[0006]

Means for Solving the Problems An invention according to claim 1 for solving the above-mentioned problems is a bridge spanning a river, a canal, a valley, a lake, or the like, wherein the bridge is a fixed bearing side or a movable bearing. to both sides, Rutotomoni provided hydraulic damper at a position distant from the rotation center of the supporting portion of the bridge, the hydraulic damper bridges
On the top or side of the main girder
It is characterized by having .

[0007]

[0008]

The invention of claim 2 is the invention according to claim 1.
And a lever is provided at an end of the vibration damping device.
Amplifies the amplitude transmitted to the
The direction of the vibration is changed .

[0010]

[0011]

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a bridge according to the present invention will be described below, but the present invention is not limited to these embodiments.

An embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, a damping bridge 11 according to the present embodiment is mounted on a river 12 or the like, and a vibration damping device 13 for preventing vibration generated when a predetermined wind blows is provided at both ends of the bridge. It is provided in.

Hereinafter, the specific contents of the vibration damping device 13 shown in FIG. 1 will be described with reference to FIGS. As shown in FIG. 2, generally, one end of a bridge main girder 25 is fixed on one abutment or pier 21 via a fixed bearing 22, and the other end is on the other abutment or pier 23. And is movable via a movable bearing portion 24. The movable bearing 24 is adapted to follow the expansion and contraction of the bridge girder due to temperature changes depending on day and night or season. Although the space at the end is not shown, the road surface is formed by a telescopic device such as a comb-like or elastic member. Here, when vibration occurs due to wind or the like, the bridge girder is displaced (rotationally displaced) around the hinge 22a of the fixed support portion 22 on the fixed support portion side as shown in FIG. On the other hand, as shown in FIG. 2B, the hinge 2 of the movable support 24
The bridge girder is displaced (rotated) around 4a. In addition,
On the movable bearing portion 24 side, horizontal displacement is also caused by the moving means 24b. For this reason, the vibration damping device 13 is appropriately installed at a suitable position between the fixed bearing side and the movable bearing side. In addition, since there is a rotational displacement and a horizontal displacement on the movable support portion 24 side, the installation position is variously changed, and the vibration damping device 13 is installed at an optimum position.

Examples of the vibration damping device 13 include a hydraulic damper that functions to suppress or prevent the damping force by hydraulic pressure, an elastic member (for example, synthetic resin), a viscous shear damper, and the like. The invention is not limited to these.

Hereinafter, an example of the arrangement of the vibration damping device on the fixed support portion side and an example of the arrangement of the vibration damping device on the movable support portion side will be specifically described.

FIG. 3 is a schematic view of a bridge in which a vibration damping device is provided on the fixed support portion side of the bridge. As shown in FIG. 3, a hydraulic damper 13 as a vibration damping device is interposed on the fixed support portion side of the bridge main girder 25 of the bridge 11 on the upper surface side of the bridge, and one end of the damper 13A is connected to the bridge main girder. The other end of the hydraulic damper 13 </ b> A is provided on an anchor 27 provided on the land 26. If it is impossible to interpose the hydraulic damper 13B on the upper side of the bridge, a hydraulic damper 13B may be provided on the side of the bridge.

By providing such a hydraulic damper 13A or 13B, the fixed bearing 2
When a rotational displacement occurs around the second hinge 22a, the vibration can be suppressed by providing the damper 13A or 13B at a location away from the rotational center.

FIGS. 4 and 5 are schematic views of a bridge in which a vibration damping device is provided on the movable support side of the bridge. 4 and 5
As shown in the figure, a hydraulic damper 13C as a vibration damping device is interposed on the upper side of the bridge on the movable support side of the bridge main girder 25 of the bridge 11, and one end of the hydraulic damper 13C is connected to the bridge main girder 25. The other end of the hydraulic damper 13 </ b> C is provided on an anchor 27 provided on the land 26. When it is impossible to interpose the hydraulic dampers 13D and 13E on the upper side of the bridge, the hydraulic dampers 13D and 13E may be provided at an upper position or a lower position on the side surface of the bridge. In addition, since it is preferable to install a hydraulic damper at a location far from the hinge 24a, which is the center of rotation, the installation position of the hydraulic damper 13D is more preferable than the installation position of the hydraulic damper 13E.

Also, as shown in FIG.
The hydraulic damper 13 which is a vibration damping device is provided between the back side and the abutment or the pier 23 on the back side of the bridge main girder 25 on the side of the movable bearing portion 5.
F, a hydraulic damper 13G is interposed.

By providing such a hydraulic damper 13C, 13D, or 13E, when a rotational displacement about the hinge 24a of the movable support 24 occurs due to the vibration due to the wind, it is separated from the rotational center. Hydraulic damper 13C or hydraulic damper 13
D, by providing the hydraulic damper 13E, the vibration can be suppressed. Further, by providing the hydraulic damper 13F or 13G on the back side of the bridge, the hydraulic damper 13F or 13G can be provided when horizontal displacement occurs by the moving means 24b of the movable bearing 24 due to wind vibration. The vibration can be suppressed.

An example in which a lever is provided at one end of the vibration damping device will be described below.

FIGS. 6 and 7 are schematic diagrams showing a case where a lever is provided at one end of the vibration damping device. As shown in FIGS. 6 and 7,
A lever 28A or 28B is provided at one end of the hydraulic damper 13H or 13I.

By providing such a lever 28A or 28B, it is possible to amplify or change the direction of the vibration transmitted to the hydraulic damper 13H or 13I.

By amplifying the vibration by the above-described method, an amplitude larger than that generated on the bridge main girder 25 is transmitted to the vibration damping device 13A. For this reason, the hydraulic damper 13H
As compared with the case without the lever 28A, the hydraulic damper
Even if it is small, the same effect can be exhibited.

By changing the direction of the vibration by the above-described method, the direction of the displacement occurring in the same direction as the bridge main girder 25 is changed. Therefore, the hydraulic damper 13I can be installed in a place such as between the abutment or the pier 23 and the bridge girder 25 as compared with the case where the lever 28B is not provided.

A bridge as shown in FIG. 1 is 100 m long.
In the case of ~ 200m, by installing two hydraulic dampers of 200mm in diameter and 1m in length on the upper surface of the bridge main girder,
It was possible to control the vibration caused by the wind.

[0028]

As described above, according to the invention of [Claim 1], a bridge bridged over a river, a canal, a valley, a lake, a marsh, or the like, wherein the fixed support side or the movable support side of the bridge is provided. both <br/> hand, Rutotomoni provided hydraulic damper at a position distant from the rotation center of the supporting portion of the bridge, the hydraulic damper of the main girder of the bridge upper surface
Since it is provided on at least one of the side and the side, a sufficient deterrent effect against rotational displacement is exhibited, vibration can be suppressed efficiently, and vibration can be prevented when vibration occurs due to wind etc. it can. Also, the hydraulic damper
On at least one of the top or side of the main girder of the bridge
Since it was provided, at the rotational displacement position away from the bearing,
Sufficient vibration suppression effect is exhibited and vibration is efficiently suppressed
be able to. Also, install the hydraulic damper on the top or side of the bridge main girder.
On the surface of the bridge.
Can quickly suppress bridge vibrations caused by
Wear.

[0029]

[0030]

According to the second aspect of the present invention, in the first aspect , a lever is provided at one end of the vibration damping device.
Vibration transmitted to the vibration damping device is amplified, sufficient effect is exhibited even with the use of a small damper, vibration can be suppressed efficiently, and the direction of vibration transmitted to the vibration damping device changes, and the abutment or pier It can be installed between bridge main girders.

[0032]

[0033]

[Brief description of the drawings]

FIG. 1 is a schematic view of a bridge according to an embodiment.

FIG. 2 is a schematic view of a fixed support side and a movable support side of a bridge.

FIG. 3 is a schematic view of a bridge in which a vibration damping device is provided on a fixed bearing portion side .
FIG.

FIG. 4 is a schematic view of a bridge in which a vibration damping device is provided on a movable bearing side.

FIG. 5 is a sectional view of FIG . 4;

FIG. 6 is a schematic diagram of a case where a lever is provided at one end of a vibration damping device.

FIG. 7 is a schematic diagram of a case where a lever is provided at one end of a vibration damping device.

FIG. 8 is a schematic view of a bridge provided with a conventional vibration damping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Bridge 12 River etc. 13 Vibration control device 13A-13I Hydraulic damper 21, 23 Abutment or pier 22 Fixed bearing part 24 Movable bearing part 25 Bridge girder 26 Land 27 Anchor part 28A-B Lever

Claims (2)

(57) [Claims] Claims: 1. A bridge bridged over a river, a canal, a valley, a lake, or the like, wherein the bridge is a fixed bearing side or a movable bearing side of the bridge.
To both of the hydraulic damper is provided at a position distant from the rotation center of the supporting portion of the bridge Rutotomoni, the hydraulic damper of the main girder of the bridge of the upper surface or the side surface side small
A damping bridge characterized by being provided at least on one side. 2. The method of claim 1, it is provided a lever on the end of the hydraulic damper, the hydraulic Dan
Together to amplify the amplitude transmitted to the path damping bridges, characterized in that changing the direction of the vibration transmitted to the hydraulic damper.