JPH10298919A - Cable vibration damping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable vibration damping structure which is excellent in the vibration damping effect of a cable, capable of preventing a cable covering pipe from being damaged, and capable of coping with the eccentricity of the cable. SOLUTION: A cable 16 is arranged in a cylindrical part of a cable band 50, and a side flange 58 of the cable band 50 is connected to an upper plate of a vibration damping body 32 by a bolt inserted in a long hole. A time plate 24 to which a base plate of the vibration damping body 32 is fixed is connected to a flange 22 of a steel pipe 20 by the bolt inserted in the long hole. The long holes are extended approximately in the orthogonal direction. The vibration damping body 32 is interposed between the side flange 58 and the tie plate 24. A rubber body interposed in the upper plate and the base plate is vulcanization-adhered to each plate, and a rubber cover is executed to its side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable damping structure for damping a cable having one end connected to a girder of a cable-stayed bridge which is one of the bridges.

[0002]

2. Description of the Related Art As is well known, a cable-stayed bridge is one in which a continuous girder is prestressed by a cable which is diagonally stretched from a tower erected on an intermediate pier.

[0003] In a usual case, this cable has a structure in which a rope made of a steel wire is covered with a synthetic resin tube such as polyethylene. The end of this cable is connected (fixed) to the main girder via a socket. A steel tube for fixing the cable or protecting the cable is provided so that the end of the cable is inserted.

[0004]

The conventional structure in which the cable end is inserted through such a steel pipe has the following problems.

Eccentricity of Cable Position The cable position of the cable-stayed bridge may not always be at the center due to a manufacturing error of the cable anchoring structure or the design, and the center position of the cross section at the tip of the anchoring steel pipe or the protective steel pipe May not be there. If the fixing device does not have a position adjustment function, it is difficult to manufacture the device without confirming the final position of the cable, and it is difficult to absorb various errors. Damage to cable cladding tube (made of polyethylene) The tip of cable anchoring tube or protective steel tube of cable stayed bridge is
Conventionally, urethane rubber or the like is filled as a cushioning material to reduce a bending angle of a cable fixing portion due to deformation of a cable due to wind. However, such a cushioning material has almost no vibration damping effect of the cable. Further, when this type of device is installed without filling the cushioning material, the fixing jig (metal) and the cable cladding tube (eg, polyethylene) collide with each other due to a typhoon or an unexpected external force, and the cladding tube is damaged.

An object of the present invention is to solve such a problem and to provide a cable damping structure capable of coping with the eccentricity of the cable position. Another object of the present invention is to provide a cable damping structure that can prevent damage to a cable cladding tube. Still another object of the present invention is to provide a cable damping structure that can be easily installed.

[0007]

A cable damping structure according to the present invention is a structure for damping a cable having one end fixed to a girder of a cable-stayed bridge. A steel band inserted into the inside, a cable band having a cylindrical portion surrounding a portion near the tip of the steel tube on the opposite side of the cable from the cable anchoring point, and a cable connected to the cable band and the tip of the steel tube. And a vibration body.

[0008] In the structure of the present invention, the cable band surrounding the cable is connected to the distal end of the steel pipe via the vibration damper. Since the cable band is provided in this manner, the cable does not directly hit the tip of the steel pipe or the like, the external force applied to the cable cladding is dispersed, and damage to the cable cladding is prevented.

In the present invention, the side flange extends outward from the cylindrical portion of the cable band perpendicularly to the cylindrical axis, and the tie plate extends from the distal end of the steel pipe toward the center of the steel pipe. Preferably, the side flange and the tie plate face each other, the damping body is interposed therebetween, and the damping body is connected to the side flange and the tie plate.

The facing surface between the tie plate and the side plate is perpendicular to the above-mentioned cylindrical axis, and the vibration damper is connected to the base plate connected to the tie plate and the side flange. An upper plate,
It is preferable to have a rubber body interposed between the base plate and the upper plate and bonded to the plates.

In such a cable damping structure, the eccentricity of the cable can be dealt with by adjusting the mounting position of the side flange and the tie plate.

By providing a rubber coating from the side surface of the rubber body to the side surface of each of the plates, it is possible to prevent separation of the joint between the rubber body and each plate.

The rubber body may be made of rubber as a whole, or may be a laminate of a rubber layer and a hard plate made of metal or the like. In the latter case, the lamination surface direction is perpendicular to the axis of the cylindrical portion.

The side flange and the tie plate are each provided with a long hole extending in the cross direction, and the side flange and the vibration damping body are connected by a bolt passing through the long hole.
Further, by connecting the tie plate to the steel pipe, it is possible to sufficiently cope with the eccentricity of the cable. Further, the work for making the structure of the present invention can be performed easily and quickly.

Preferably, the long hole of the side flange extends in a direction parallel to the diameter direction of the cylindrical portion, and the long hole of the tie plate preferably extends in the circumferential direction of the steel pipe.

[0016]

1 is a sectional view showing a cable damping structure according to an embodiment, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a line III-III in FIG. FIG. 4 is a configuration diagram showing a state in which a cable band is removed in FIG. 3, FIG. 5 is a perspective view showing a tie plate and a mounting state of a vibration damper, FIG. 6 is a sectional view taken along the line VI-VI of FIG.

In FIG. 1, an end of a cable 16 is fixed to a fixing girder 12 connected to a main girder 10 via a socket 14. The end of the cable 16 is inserted into the steel pipe 20.

As shown in FIG. 2 to FIG.
0 is provided with an outward flange-shaped flange 22 at the upper end by welding.
4 is fixed by bolts 26. The tie plate 24 has a substantially rectangular shape, and its outer peripheral edge is
2 has an arc shape having the same curvature as the outer edge. An elongated hole 28 extends along the outer peripheral edge of the tie plate 24,
The bolt 26 is formed by the elongated hole 28 and the bolt hole 3 of the flange 22.
The tie plate 24 is fixed to the flange 22 by being inserted into the flange 0 and tightening the nut.

The pair of tie plates 24 are connected to the steel pipe 20.
And the front end side extends toward the center of the steel pipe 20.

A vibration damper 32 is fixed to the upper surface of each tie plate 24 by a bolt 34. The vibration damping body 32 includes a base plate 36 and an upper plate 38 each made of a steel plate, and these plates 36 and 38.
And a rubber body 40 interposed therebetween. Rubber body 40
Is a single body entirely made of rubber, or a composite body in which a rubber layer and a hard plate such as a metal thin plate are laminated.
The rubber body 40 is joined to the upper and lower plates 36 and 38 by vulcanization bonding. As shown in FIG. 6, a rubber coating 42 is provided from the side surface of the rubber body 40 to the side surfaces of the plates 36 and 38 in order to prevent the vulcanized adhesive surface from peeling due to salt damage or the like.

The base plate 36 is provided with a long hole 44 extending in a direction parallel to the diameter direction of the steel pipe 20, and a bolt inserted through the long hole 44 and a bolt hole provided in the tie plate 24 is provided. When the nut 46 is tightened to the, the vibration damping body 32 is fixed to the tie plate 24.

The upper plate 38 has a tap hole 4
8 are provided.

A cable band 50 is provided so as to be supported by the pair of vibration dampers 32. The cable band 50 is formed by connecting a pair of cable band halves 52 with each other by connecting flanges 54 thereof. Each half 52 includes a semi-cylindrical portion 56, a coupling flange 54 extending from an edge of the semi-cylindrical portion 56, and side flanges 58 extending outward from the semi-cylindrical portion 56. The cable flange 50 is formed by overlapping the connecting flanges 54 of the half bodies 52, 52 and connected by bolts 60 and nuts 62, and the cylindrical part 64 is formed by the half cylindrical parts 56, 56 facing each other. . The cable 16 is arranged in the cylindrical portion 64.

The side flanges 58, 58 extend in a direction perpendicular to the axis of the cylindrical portion 64 and diametrically outward from the cylindrical portion 64. A pair of long holes 66 extending in a direction parallel to the diameter direction are provided in each side flange 58.

The bolts 68 inserted into the elongated holes 66 are used to connect the tap holes 4 of the upper plate 38 of the vibration damping body 32 with each other.
The cable band 50 is connected to the vibration damper 32 by being screwed into the cable band 8.

The tip of the steel pipe 20 and the cable band 5
A waterproof cover 70 is provided so as to cover the cable 0 and its vicinity. The waterproof cover 70 has a substantially spun shape. The small diameter side is in close contact with the outer peripheral surface of the cable 16, and the large diameter side is in close contact with the outer peripheral surface of the distal end portion of the steel pipe 20.

In the thus configured cable damping structure, the cable 16 is disposed in the cylindrical portion 64 of the cable band 50, and the side flange 58 of the cable band 50 has a bolt 68 inserted into its long hole 66. Thus, it is connected to the upper plate 38 of the vibration damper 32. The tie plate 24 to which the vibration damping body 32 is fixed is
It is connected to the flange 22 of the steel pipe 20 by a bolt 26 inserted into the long hole 24. These slots 66, 28
Extend in a substantially orthogonal direction, the cylindrical portion 64
Can be displaced in any direction in the cross-sectional direction of the steel pipe 20, so that the eccentricity of the cable 16 can be sufficiently dealt with.

The side flange 58 and the vibration damper 3
2, the connection between the damping body 32 and the tie plate 24, and the connection between the tie plate 24 and the flange 22 are extremely easy.

The side flange 58 and the tie plate 2
Since the vibration damper 32 is interposed between the vibration damper 4 and the vibration damper 4, the vibration of the cable 16 can be absorbed and the vibration damping effect is excellent. In particular, when the rubber body 40 has a laminated structure of a rubber layer and a hard plate layer,
This damping effect is extremely high.

The cable 16 is connected to a pair of semi-cylindrical portions 56,
When the cable 16 undergoes a large displacement, the semi-cylindrical portion 56 comes into contact with the tie plate 24, and damage to the cable cladding caused by direct contact of the cable cladding with the tie plate 24 is eliminated. Is done.

As shown in FIG. 6, since the rubber covering 42 is applied to the vibration damping body 32, even when the vibration damping body 32 is installed in an environment such as a sea with a lot of salt, the rubber body 40 and the plates 36 and 38 are provided.
The peeling of the vulcanized adhesive surface with the film is reliably prevented. Further, rust prevention of the plates 36 and 38 can be achieved, and plating and painting of the plates 36 and 38 can be omitted or simplified.

The rubber coating 42 may be the same rubber as the rubber constituting the rubber body 40, or may be a different kind of weather-resistant rubber.

[0033]

As described above, the cable damping structure of the present invention is excellent in the damping effect of the cable and can prevent the damage of the cable cladding tube. It is also possible to cope with the eccentricity of the cable. Further, the installation work can be facilitated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a configuration diagram showing a cable band, a tie plate, and a steel pipe.

FIG. 4 is a configuration diagram showing a tie plate and a steel pipe.

FIG. 5 is a perspective view showing a tie plate and a steel pipe.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3;

[Explanation of symbols]

 Reference Signs List 16 cable 20 steel pipe 22 flange 24 tie plate 28 long hole 32 damper 40 rubber body 42 rubber coating 50 cable band 66 long hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuo Imada 1-3-2 -306 Inagekaigan, Mihama-ku, Chiba-shi, Chiba Prefecture (72) Inventor Chiaki Sudo 8-2-1004 Sakonyama, Asahi-ku, Yokohama-shi, Kanagawa Prefecture

Claims (8)

[Claims] 1. A structure for damping a cable having one end fixed to a girder of a cable-stayed bridge, comprising: a steel pipe having a portion near the one end of the cable inserted therein; A cable damping structure comprising: a cable band having a cylindrical portion surrounding a portion near a tip end of a steel pipe opposite to a fixing point; and a damping body connected to the cable band and the tip end of the steel pipe. 2. The steel pipe according to claim 1, wherein a side flange extends outward from the cylindrical portion of the cable band perpendicular to a cylindrical axis, and extends from a tip end of the steel pipe toward a center of the steel pipe. The tie plate is extended, the side flange and the tie plate face each other, the damping body is interposed therebetween, and the damping body is connected to the side flange and the tie plate. Characteristic cable damping structure. 3. The tie plate according to claim 2, wherein the facing surface of the tie plate and the side flange is perpendicular to the cylindrical axis, and the vibration damping member is a base plate connected to the tie plate; And a rubber member interposed between the base plate and the upper plate and bonded to the plates. 4. The cable damping structure according to claim 3, wherein a rubber coating is applied from a side surface of the rubber body to a side surface of each of the plates. 5. The cable damping structure according to claim 2, wherein the rubber body is entirely made of rubber. 6. The rubber body according to claim 2, wherein the rubber body is a laminated structure in which a rubber layer and a hard plate layer are laminated, and a layer surface direction of these layers is an axis of the cylindrical portion. Cable damping structure characterized by being perpendicular to the line. 7. The side flange according to claim 2, wherein each of the side flange and the tie plate has an elongated hole extending in a cross direction, and is inserted into the elongated hole of the side flange. The side flange and the vibration damping body are connected by the provided bolt, and the tie plate is connected to the steel pipe by the bolt inserted into the long hole of the tie plate. 8. The elongated hole of the side flange according to claim 7, wherein the elongated hole extends in a direction parallel to a diameter direction of the cylindrical portion, and the elongated hole of the tie plate extends in a circumferential direction of the steel pipe. Cable damping structure characterized by the following.