JPH0516484B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cable corner bend buffering device, and more specifically, it alleviates corner bends at the anchorage part of cable-stayed bridge cables, and protects cables and socket ends. This invention relates to a cable corner bending buffer that prevents concentrated bending moments from occurring in the cable.

[Prior art]

Generally, in cable-stayed bridge cables, it is known that a bending moment is generated at the socket end of the cable due to elastic deformation of the girder or tower due to live load loading, changes in cable sag, and changes in the angle of the cable anchorage due to vibration, etc. .

By the way, as a conventional means for protecting the terminal end of a wire rope, for example, as disclosed in Japanese Patent Application Laid-Open No. 144689/1989, a close-sliding device made of an elastic material or the like is placed near the processed terminal end of the wire rope. A device equipped with a protective tube has been proposed.

However, in the case of such a wire rope protection tube, it is not possible to effectively reduce the concentrated bending moment that acts on the end portion due to changes in the angle of the anchoring portion of the wire rope. In addition, it is necessary to create a protective cylinder with a shape and size corresponding to the above, which raises the problem of increasing costs and requiring a great deal of effort and time for replacement work.

[Purpose of the invention]

The present invention was devised in view of these conventional problems, and its purpose is to alleviate corner bends at the anchorage of cable-stayed bridge cables, and to reduce bending moment at the socket end of the cable. Provides a cable corner bending buffer that is configured to prevent rainwater from concentrating, and also completely shuts off water at the joints between the cable and the bridge towers and girders, effectively preventing rainwater from entering the fixed area. It is something to do.

[Structure of the invention]

In order to achieve the above object, the present invention is a cable corner bending buffer device that prevents concentrated bending moments from occurring at the socket end of the cable.
at a predetermined position from the socket end of the cable;
A cylindrical buffer that covers the outer circumferential surface of the cable and through which the cable can pass is provided, and a casing outer tube that can fit tightly onto the outer circumferential surface of the buffer is provided, and both ends of the buffer and between the cable,
A cover with a funnel-shaped filler supply/discharge port is provided, one end of which is in close contact with the casing outer tube, and the other end is in close contact with the outer peripheral surface of the cable, and both ends of this cover are connected to the casing outer tube and the cable through respective fastening means. In addition to tightly fixing the cable to the outer circumferential surface, the gap defined by the outer circumferential surface of the cable, the cushioning body, and the cover is filled with a filler material and hardened in order to fix the cable tightly and integrally with each other. The gist of this is that

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a sectional view of a fixing structure for a cable-stayed bridge cable 2 in which a corner bending buffer device 1 according to the present invention is installed, in which a socket 3 is provided at the end of the cable 2, and a fixing member 4 The cable 2 is supported under a predetermined tension.

Further, the corner bending buffer device 1 is fixed to the entrance of the cable 2 to the girder or tower, and is supported by the struts 5.

Next, as shown in FIG. 2, the configuration of the corner bending buffer device 4 installed on the eccentric cable 2 is as follows.
At a predetermined position from the end of the socket 3 of the cable 2, cover the outer peripheral surface of the cable 2 and
A cylindrical buffer body 6 (buffer rubber) that can be penetrated is provided, and a casing outer tube 7 that can be brought into close contact with the outer circumferential surface of the buffer body 6 is fitted.

The buffer body 6 has a cylindrical shape with an inner diameter larger than the outer diameter of the cable 2 and is made of a rubber-like elastic material such as rubber or urethane.

The outer casing tube 7, which is provided in close contact with the outer peripheral surface of the buffer body 6, absorbs the external force from the cable 2 and transfers it to the buffer body 6.
supports almost the entire length of the support member 5, and functions to transmit this support to the support member 5.

Note that if the buffer body 6 and the casing outer tube 7 have a two-part structure having a joint surface in the length direction, they can be attached to the cable 2 after the cable is expanded.
In addition, if the joint surfaces of the divided buffer body 6 are made into a nutkly jointed structure or a parallel key-shaped joint structure, the sealing performance of the joint surfaces can be improved, and leakage during injection of the filler W, which will be described later, can be effectively prevented. can be prevented. Furthermore, by providing a convex portion 6a on the outer circumferential end of the buffer body 6, as shown in the figure, the thickness of the outer casing tube 7 and the buffer body 6 are equal to each other.
This can prevent misalignment.

Between both ends of the buffer body 6 and the cable 6, funnel-shaped filler supply/discharge ports 8a and 8b are provided, one end of which is in close contact with the casing outer tube 2 and the other end is in close contact with the outer peripheral surface of the cable 2. A cover 9 is provided, and each end of the cover 9 is connected to a fastening means 1 such as a band.
Casing outer pipe 7 via 0a, 10b, 10c
and the outer peripheral surface of the cable 2.

The cover 9 is made of EPT, which is highly weather resistant and flexible.
It is made of a rubber material such as CR, and as mentioned above, one end with a large diameter is brought into close contact with the outer peripheral surface of the casing outer tube 7.
Further, the other end of the small diameter is brought into close contact with the outer circumferential surface of the cable 2, and the casing outer tube 7 and the outer circumferential surface of the cable 2 are firmly fixed via fastening means 10a, 10b, and 10c, respectively.

The cover 9 can be wrapped around the casing outer tube 7 and the cable 2, or the funnel-shaped cover 9 can be cut in the axial direction, the cover 9 opened and fitted onto the cable 2, and the cover 9 can be cut in another axial direction. The cut part is shifted and overlapped with the upper part of the cover 9 which has already been fitted.

As a method of fixing the cover 9, it is also possible to divide the cover 9 into two parts, provide flanges at the abutting parts of the two parts, and assemble them with bolts or the like.

Next, the cavity 11 defined by the outer circumferential surface of the cable 2, the buffer body 6, and the cover 9 is filled with a filler W for integrally fixing them in close contact with each other. It is hardened.

The filler W is a liquid synthetic resin that hardens at room temperature such as an epoxy resin or a urethane resin, or an injectable material such as mortar or latex mortar. entrance)
Then, it is injected and hardened into the gap 11 between the cable 2 and the buffer 6 or the cover 9 to integrally fix them together.

When injecting the filler W, the air in the cavity 11 is discharged from the exhaust port 8b provided in the cover 9 so that a large injection pressure does not act on the cover 9, and so that no air remains in the cavity 11. do.

〔Effect of the invention〕

As described above, the present invention is a cable corner bending buffer device that prevents concentrated bending moments from occurring at the socket end of the cable, and the invention is a cable corner bending buffer device that prevents a concentrated bending moment from occurring at the socket end of the cable, and in which the outer circumferential surface of the cable is bent at a predetermined position from the socket end of the cable. A cylindrical cushioning body that can be covered and through which the cable can pass is provided, a casing outer tube that can be tightly attached to the outer peripheral surface of the cushioning body is fitted, and a casing outer tube that can be tightly fitted is provided between both ends of the cushioning body and the cable. , a cover is provided with a funnel-shaped filler supply/discharge port whose one end is in close contact with the casing outer tube and the other end is in close contact with the outer peripheral surface of the cable, and both ends of this cover are connected to the casing outer tube through respective fastening means. A filler is filled and hardened in order to tightly fix the cable to the outer circumferential surface of the cable, and to make the gap defined by the cable outer circumferential surface, the shock absorber, and the cover closely adhere to each other and fix them integrally. With this configuration, the following excellent effects can be achieved.

(a) Even if the cable is eccentric, a shock absorber having the specified shock absorbing characteristics can be easily installed.

(b) When the cables have different thicknesses, simply create the dimensions of the cable joint part of the cover according to the cable thickness, and the cushioning rubber can be applied to a product with a single specification, making it easy to manufacture and reducing costs. You can try to bring it down.

(c) By using a combination of filler and cover, the joint between the cable and the bridge tower or girder can be watertight for a long period of time.

(d) The cable and cover, and the cable and buffer are integrated with a filler such as synthetic resin, and have high resistance to external forces.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view of a cable-stayed bridge cable fixing structure in which a corner bending buffer according to the present invention is installed, and FIG. 2 is an enlarged sectional view of the corner bending buffer. DESCRIPTION OF SYMBOLS 1... Corner bending shock absorber, 2... Cable, 3... Socket end, 6... Buffer body, 7... Casing outer tube, 8
a, 8b...filler supply/discharge port, 9...cover, 10a,
10b, 10c... fastening means, 11... void, W...
Filling material.

Claims (1)

[Claims] 1. A cable corner bending buffer designed to prevent concentrated bending moments from occurring at the socket end of the cable, which covers the outer peripheral surface of the cable at a predetermined position from the socket end of the cable, and through which the cable penetrates. Provide a buffer body formed into a cylindrical shape,
A casing outer tube that can fit tightly onto the outer peripheral surface of the buffer body is provided between both ends of the buffer body and the cable, one end of which is in close contact with the casing outer tube, and the other end of which is in close contact with the outer circumferential surface of the cable. A cover is provided with a tightly fitting funnel-shaped filler supply/discharge port, and both ends of this cover are tightly fixed to the casing outer tube and the outer peripheral surface of the cable via fastening means, and the outer peripheral surface of the cable, the buffer body, and the cover are tightly fixed. A cable corner bend shock absorbing device characterized in that a cavity defined by the above is filled with a filler material for integrally fixing the spaces in close contact with each other and hardened.