JP5929316B2 - Inclined cable vibration prevention device and method for attaching / detaching the same - Google Patents

Description

  The present invention relates to an inclination cable vibration preventing apparatus and a method for attaching and detaching the inclined cable which can effectively prevent vibration of the inclined cable with a simple configuration and can be easily attached to and detached from the inclined cable.

  The cable stayed bridge has a plurality of inclined cables installed diagonally between the bridge girder and the main tower, and the bridge girder is supported by these inclined cables. The above-mentioned inclined cable consists of a steel wire bundle in which a plurality of steel wires or stranded wires of steel wires are bundled, and the outer surface of the steel wire bundle is usually covered with a high-density polyethylene protective tube in order to prevent corrosion of the steel wires. have.

  When the cross-sectional area of the inclined cable is small, the outer surface of the steel wire bundle is covered with a protective tube at a factory or the like, and this is wound up into a roll and transported to the site for installation. In the case of an inclined cable with a large area, it is difficult to wind up a cable with a protective tube installed over its entire length and to transport the protective tube without damaging it. A protective tube made of a high-density polyethylene having a length of 5 mm is arranged and bonded to each other.

  In a cable-stayed bridge having an inclined cable as described above, it is known that the inclined cable generates vibration called rain vibration due to wind and rain. When only the wind blows on the inclined cable, Karman vortices are regularly formed behind the cable, which may cause vortex excitation, but generally the vibration is small and the inclined cable is relatively stable. . On the other hand, when wind containing rain is blown, water droplets attached to the surface of the inclined cable gather near the separation point of the upper and lower winds, forming a water channel, and the inclined cable is aerodynamically inefficient. Rain vibration occurs due to the stable cross section. When rain vibration occurs, an excessive force acts on the joint between the inclined cable and the bridge girder and the main tower. When rain vibration occurs repeatedly, the joint between the inclined cable and the bridge girder and the main tower occurs. Damage may accumulate.

  The above-mentioned rain vibration does not always occur on a cable-stayed bridge with an inclined cable, but occurs when the weather conditions (wind and rain conditions) of the place where the cable-stayed bridge is installed are in place. However, it is necessary to install a device for preventing the occurrence of rain vibration for a cable-stayed bridge in which rain vibration of such an inclined cable is predicted.

  Conventionally, as a device for preventing rain vibration and other vibrations in the inclined cable, there is a device in which a damper device is installed in each inclined cable, and the vibration of the inclined cable is suppressed by the damper device (patent). References 1, 2 etc.).

  However, the damper devices as shown in Patent Documents 1 and 2 have a complicated structure and are expensive, and further, there is a problem that it is necessary to continue maintenance for maintenance and management. Further, in the case of a hydraulic damper as disclosed in Patent Document 1, there is a problem that control is required.

  On the other hand, there is one that prevents the occurrence of rain vibration by providing protrusions on the surface of the protective tube (see Patent Documents 3 and 4). For example, in Patent Document 3, a spiral protrusion is provided on the surface of the protective tube, and the occurrence of rain vibration is prevented by preventing the formation of a water channel on the surface of the inclined cable. Moreover, in patent document 4, the processus | protrusion extended in the longitudinal direction of a protective tube is provided in the surface of the said protective tube, and generation | occurrence | production of a rain vibration is prevented by fixing the position of the water channel on the inclined cable surface.

  Further, as shown in Patent Document 5, in order to connect the ends of the protective tubes provided on the outer side of the bundle, a sleeve is fitted on the outer side of the abutting end of the protective tube. Some have protrusions.

  Further, as shown in Patent Document 6, a triangle band and a protrusion are formed on the outer periphery, and a damper band having a tension strap is provided, and the tension band is wound around and fixed to the outer peripheral surface of the inclined cable. There is a fixing device that fits and fixes a male and a female provided at one end and the other end of the strap, or a fixing device that pulls a tension strap and fixes it to a damper band.

Japanese Patent Laid-Open No. 11-172618 Japanese Patent Laid-Open No. 07-003720 JP 05-071104 A JP 2005-155286 A Japanese Patent Laid-Open No. 2002-333084 US Pat. No. 6,386,526

  However, as shown in Patent Documents 3 and 4, those having protrusions on the outer surface of the protective tube have a problem in that it takes time to form the protective tube and the manufacturing cost increases. In addition, it is desirable that the inclined cable has a small wind load acting on the inclined cable. Therefore, it is preferable that the outer surface of the inclined cable does not have a large protrusion or the like. In the case of a configuration with a relatively high protrusion, there is a problem that the wind load increases. Furthermore, there is a problem that a great deal of labor is required when installing on existing cables.

  Further, in the case of Patent Document 5, the sleeve for fixing the ends of the protective tube while maintaining the strength has a shape protruding outward, which may increase the wind load. . Furthermore, in the case of Patent Document 5, it is necessary to heat and soften the butt portion in order to fix the butt end portion of the protective tube with the sleeve. However, performing this work on site is a problem that workability is low. There is.

  On the other hand, the damper band shown in Patent Document 6 can be installed at any position on the outer surface of the protective tube, but the cross-sectional shape is a complex assembly having a triangular portion and a protruding portion, and having a tension strap. Due to the structure, there is a problem that the apparatus becomes expensive. Furthermore, there is a problem that the installation work at a high place is difficult and the work of attaching the damper band at predetermined intervals while measuring the distance at the high place is also difficult. Moreover, since the damper band of Patent Document 6 has a large cross-sectional shape including a triangular portion and a protruding portion in order to maintain strength, there is a possibility that the wind load increases.

  In addition, as described above, the vibration prevention device having the conventional protrusion has a problem that it is not possible to easily select and install the installation interval with respect to the inclined cable, and there is a request to remove the installed vibration prevention device. In some cases, there is a problem that cannot be easily removed, and even if it is possible to remove the vibration prevention device, if there is a request for removal after the cable-stayed bridge is in service, It was necessary to construct a scaffolding and carry out removal work, which had problems in terms of traffic and work.

  The present invention has been made in view of the above-described conventional problems, and can effectively prevent vibration of the inclined cable with a simple configuration, and can be easily attached to and detached from the inclined cable. And an attachment / detachment method thereof.

The present invention is an apparatus for preventing vibration of an inclined cable in which rubber wires wound around the outer peripheral surface of the inclined cable are arranged at predetermined intervals in the longitudinal direction of the inclined cable,
Rubber wire,
A mounting portion to which one side of the rubber wire is attached at one end of the shaft portion, a bending portion which is provided at the other end of the shaft portion and is bent in an arcuate manner away from the axis of the shaft portion, the bending The top of the rubber wire is bent so as to be separated from the shaft portion , and the engagement end is bent to be connected to the top portion so as to approach the shaft portion. a hook section capable, and a locking member that have a,
A guide rope fastened to the curved portion of the hook portion of each engaging member a plurality of said locking members is to maintain a predetermined spacing,
The present invention relates to an apparatus for preventing vibration of an inclined cable.

  In the tilt cable vibration preventing apparatus, the rubber wire may be an annular rubber wire or a cut rubber wire obtained by cutting a linear rubber wire to a required length.

Further, in the vibration preventing device of the inclined cable, the locking member is at one end of the shaft portion is provided with the attachment portion by the mounting ring, the other end of the shaft portion be provided with the hook portion Good.

Further, in the vibration preventing device of the inclined cable, the locking member is S-shaped hook having a hook portion opposite to each other at both ends of the shaft portion, one of the hook portions of the S-shaped hook the attachment And the other hook portion of the S-shaped hook may be the hook portion .

Further, in the vibration preventing device of the inclined cable, the locking member is at one end of the shaft portion is provided with the mounting portion by attaching projection, the other end of the shaft portion is provided with the hook portion Also good.

The present invention is a method for attaching / detaching the vibration preventing device for an inclined cable, wherein a curved portion of a hook portion is fastened to a lower surface of the inclined cable by a guide rope at a predetermined interval, and a rubber wire is attached to the attaching portion. one of a plurality of locking members which side is attached is disposed, said one of the engaging member mounting portion in the other side the one wound on the outer circumferential surface of the inclined cable rubber line fitted with one side said one locking member is fixed by engaging the hook portion of the locking member, followed by the other locking member which is fastened to hold a predetermined distance in said one locking member fixed by utilizing the length of the guide rope is arranged on the lower surface of the inclined cable in the above intervals, and another side of the rubber wire attached to the mounting portion by winding the outer circumferential surface of the inclined cable of the other locking member Lock to the hook portion of the other locking member Wherein performs mounting of other vibration preventing device by fixing the locking member, at the time of removal of the anti-vibration device, the each locking member which is fastened to the guide rope by pulling the lower end of the guide rope by the The bending portion is pulled, and each locking end is removed by being removed from the other side of the rubber wire.

  According to the vibration preventing device for an inclined cable and the method for attaching / detaching the inclined cable according to the present invention, vibration of the inclined cable can be effectively prevented with a simple configuration without increasing the wind load, and each locking member can be Each of the locking members can be easily positioned and attached by the guide rope fastened at intervals, and when the vibration preventing device is removed, each of the fastening members fastened to the guide rope by pulling the lower end of the guide rope. An excellent effect that the locking member can be unlocked and simultaneously removed can be obtained.

It is a front view which shows one Example of the vibration prevention apparatus of the inclination cable of this invention. It is a front view of the cyclic | annular rubber | gum wire which comprises the vibration preventing apparatus of this invention. It is a front view which shows the other example of the latching member which comprises the vibration preventing apparatus of this invention. It is a front view which shows the further another example of the latching member which comprises the vibration preventing apparatus of this invention. It is explanatory drawing of the cutting | disconnection rubber | gum wire which comprises the vibration preventing apparatus of this invention. It is a front view which shows the attachment state of the cutting | disconnection rubber | gum wire with respect to a locking member. It is a front view which shows the state which installed the vibration prevention apparatus in the lower surface of an inclination cable. (A) is the side view which looked at FIG. 7 from the XX direction, (b) is operation | movement explanatory drawing which shows the state which pulled the guide rope downward from the state of (a). It is a front view which shows the state from which the rubber wire latched by the hook part of the latching member remove | deviates from a hook part by pulling of the guide rope of FIG.8 (b).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing an embodiment of a vibration preventing device for an inclined cable according to the present invention. The vibration preventing device 1 is a guide for fastening a locking member 2 and a plurality of locking members 2 at a required interval H. It comprises a rope 3 and a rubber wire 4 attached to the locking member 2 and wound around the outer surface of an inclined cable K, which will be described later.

  In the locking member 2 of FIG. 1, a mounting portion 6 including a mounting ring 6 a is provided at one end of the shaft portion 5, and a hook portion 7 is provided at the other end of the shaft portion 5. The hook portion 7 of the locking member 2 includes a curved portion 7a bent in an arc from the other end of the shaft portion 5, a top portion 7b connected to the curved portion 7a, and a shaft portion 5 side connected to the top portion 7b. And a latching end 7c bent to the right. In FIG. 1, the top portion 7 b side has a locking allowance 7 d which is a locking depth of the hook portion 7 with respect to a line passing through the locking end 7 c perpendicular to the extension axis of the shaft portion 5. . The locking member 2 is preferably manufactured using a metal such as stainless steel which is not easily rusted, or a synthetic resin having high durability against the natural environment.

  The guide rope 3 is fixed via a fastening portion 8 at a position near the top portion 7b of the curved portion 7a of the hook portion 7 included in each locking member 2. The fastening portion 8 may be formed by binding the guide rope 3 to the curved portion 7a, or may be fixed by crushing a U-shaped stopper with a caulking device. As the guide rope 3, various materials can be used as long as they have strength against the natural environment, but it is preferable to use a nylon rope that is lightweight and has high strength.

  The rubber wire 4 in FIG. 1 shows a case where the annular rubber wire 9 shown in FIG. 2 is used. For the annular rubber wire 9, chloroprene (neoprene) rubber, ethylene / propylene rubber, urethane rubber or the like having strength against the natural environment can be used. The diameter T (thickness) of the annular rubber wire 9 is preferably about 3 mm.

  The annular rubber wire 9 in FIG. 2 is deformed so that the circular shape is a straight line (parallel two wires), and one side 4a is passed through the mounting ring 6a in FIG. The other side 4a of the annular rubber wire 9 is tightened by passing the other side 4b inside thereof, thereby fixing the one side 4a of the annular rubber wire 9 to the mounting ring 6a. The annular rubber wire 9 has a length that is suitably fixed when wound around the outer peripheral surface of the inclined cable with a predetermined tension in a state of being linearly deformed (formed as two parallel wires) as shown in FIG. The diameter D of the annular rubber wire 9 in FIG.

Figure 3 shows a further embodiment of the locking member 2, the locking member 2, the ends of the shaft portion 5, together hook component 7 opposite ', 7''is formed The case of an S-shaped hook is shown. In the locking member 2 by S-shaped hooks 3, the hook portion component 7 'via the fastening portion 8 in the curved portion 7a fixed to the guide rope 3 as a hook part 7, the hook portions min 7''is attached portion 6, one side 4a of the annular rubber wire 9 is fixed.

  FIG. 4 shows still another embodiment of the locking member 2. The locking member 2 includes an attachment portion 6 including an attachment projection 6 b at one end of the shaft portion 5. The hook portion 7 is provided at the other end. In the locking member 2 of FIG. 4, the guide rope 3 is fixed to the curved portion 7a of the hook portion 7 via the fastening portion 8, and the one side 4a of the annular rubber wire 9 is fixed to the mounting protrusion 6b.

  FIG. 5 shows another embodiment of the rubber wire 4. The rubber wire 4 is formed by, for example, rolling a long rubber wire 10 wound into a roll shape into a predetermined length L by a cutting machine 11. The case of the cut rubber wire 12 manufactured by cutting is shown. The cut rubber wire 12 is also made of chloroprene rubber, ethylene / prene rubber, urethane rubber or the like as in the above embodiment.

  As shown in FIG. 6, the cut rubber wire 12 is fixed to the mounting ring 6a by passing one side 4a through the mounting ring 6a of the locking member 2 and crushing the U-shaped clasp 13 with a caulking device. Yes. On the other side 4b of the cut rubber wire 12, a retaining ring 14 for hooking and locking the hook portion 7 of the locking member 2 is formed. The retaining ring 14 can be formed by folding back the other side 4b of the cut rubber wire 12 and crushing and fixing the U-shaped retaining member 13 with a caulking device. The cut rubber wire 12 in FIG. 5 is cut to a length L that is suitably fixed when wound around the outer peripheral surface of the inclined cable K with a predetermined tension.

  The cut rubber wire 12 shown in FIG. 5 has a locking member 2 having the locking member 2 by the S-shaped hook shown in FIG. 3 and the mounting portion 6 including the mounting protrusion 6b shown in FIG. It can also be applied to the member 2.

  The inventors set the vibration preventing device 1 having the rubber wire 4 having a diameter T of 3 mm to the inclined cable K having a circumference of 440 mm (diameter A = 140 mm) at an interval of about 500 mm, that is, the inclined cable K. In the test model arranged at an interval H of about 3 to 4 times the diameter A, the wind load when the wind is applied and the generation of rain vibration when the wind and water droplets (rain) are applied A test to measure was performed.

  As a result of the test, it was found that according to the vibration preventing apparatus 1 under the above conditions, the occurrence of rain vibration can be reduced without increasing the wind load.

  Below, the attachment / detachment method of the said vibration prevention apparatus with respect to an inclination cable is demonstrated.

  As shown in FIGS. 7 and 8A, the guide cable 3 is fastened to the lower surface k of the outer peripheral surface of the inclined cable K at a predetermined interval H, and the respective attachments as shown in FIGS. One of the locking members 2 to which one side 4a of the rubber wire 4 is attached is disposed on the portion 6, and the rubber wire 4 attached to the attachment portion 6 of the locking member 2 is wound around the outer peripheral surface of the inclined cable K. The other side 4b is locked to the hook portion 7 of the locking member 2 and fixed. At this time, the locking member 2 is in contact with the lower surface k of the inclined cable K.

  Subsequently, another adjacent (lower) locking member 2 is moved under the inclined cable K by using the length of the guide rope 3 fastened to the fixed locking member 2 while maintaining the interval H. The rubber wire 4 disposed on the side surface k and attached to the attachment portion 6 of the other locking member 2 is wound around the outer peripheral surface of the inclined cable K, and the other side 4b is connected to the hook portion 7 of the other locking member 2. Lock and fix. By repeating the above operation, all the locking members 2 can be efficiently installed on the inclined cable K while maintaining the predetermined distance H. The guide rope 3 does not need to be in close contact with the inclined cable K and may be somewhat loose.

  When it is necessary to remove the vibration preventing device 1 from the inclined cable K, the lower end of the guide rope 3 is pulled downward in the vertical direction. When the guide rope 3 is pulled downward, since the guide rope 3 is fixed to the curved portion 7a of the locking member 2 by the fastening portion 8, the locking that has been in contact along the lower surface k of the inclined cable K The member 2 is raised as shown in FIG. Further, as shown in FIG. 9, the guide rope 3 is fixed to the curved portion 7 a having a short distance from the other side 4 b with respect to the distance from the one side 4 a of the rubber wire 4. The hook portion 7 is disengaged from the other side 4 b of the rubber wire 4 by receiving a force rotating in the direction of arrow R. At this time, in order to surely remove the hook portion 7 from the rubber wire 4, it is preferable that the locking allowance 7d which is the locking depth of the top portion 7b is small. Even when the locking allowance 7d is set to be small in this way, in the state where the vibration preventing device 1 is mounted on the inclined cable K, tension is applied to the rubber wire 4 locked to the hook portion 7. Therefore, the hook portion 7 does not come off from the rubber wire 4.

  As described above, when the guide rope 3 is pulled, the hook portions 7 of the respective locking members 2 are unlocked one after another, so that the vibration preventing device 1 as a whole finally falls.

  Further, since the rubber wire 4 falls while being fixed to the mounting portion 6 of the locking member 2 and does not scatter, the operator can easily pull the guide rope 3 and easily make the entire vibration preventing device. It can be recovered.

  According to the above-described inclined cable vibration preventing device, vibration of the inclined cable K can be effectively prevented with a simple configuration without increasing the wind load, and each locking member 2 is fastened at a predetermined interval H. The distance H between the locking members 2 can be easily positioned and attached by the guide rope 3, and when the vibration preventing device is removed, the guide rope 3 is fastened to the guide rope 3 by pulling the lower end of the guide rope 3. Each locking member 2 can be unlocked and simultaneously removed.

  In addition, the vibration prevention device of the inclined cable and the method of attaching / detaching the same according to the present invention are not limited to the above-described embodiments, and the shape of the locking member is not limited to the illustrated examples. Of course, various modifications can be made without departing from the scope of the present invention.

1 antivibration device 2 engaging member 3 guides the ropes 4 rubber line 4a one side 4b the other side 5 shank 6 mounting portion 6a mounting ring 6b attaching projection 7 hook portion 7 'hook component
7 '' hook portion 7a curved portion 7b top portion 7c locking end 8 fastening portion 9 annular rubber wire 12 cut rubber wire H interval K inclined cable k lower side surface

Claims (6)

An apparatus for preventing vibration of an inclined cable in which rubber wires wound around an outer peripheral surface of the inclined cable are arranged at predetermined intervals in the longitudinal direction of the inclined cable,
Rubber wire,
A mounting portion to which one side of the rubber wire is attached at one end of the shaft portion, a bending portion which is provided at the other end of the shaft portion and is bent in an arcuate manner away from the axis of the shaft portion, the bending The top of the rubber wire is bent so as to be separated from the shaft portion , and the engagement end is bent to be connected to the top portion so as to approach the shaft portion. a hook section capable, and a locking member that have a,
A guide rope fastened to the curved portion of the hook portion of each engaging member a plurality of said locking members is to maintain a predetermined spacing,
An apparatus for preventing vibration of an inclined cable, comprising:   2. The apparatus for preventing vibration of an inclined cable according to claim 1, wherein the rubber wire is an annular rubber wire or a cut rubber wire obtained by cutting a linear rubber wire to a required length. It said locking member, said one end of the shaft portion is provided with the attachment portion by the mounting ring, the other end of the shaft portion according to claim 1 or 2, characterized in that it comprises the hook portion Anti-vibration device for slanted cable. The locking member is S-shaped hook having a hook portion opposite to each other at both ends of the shaft portion, one of the hook portions of the S-shaped hook is the mounting portion, the other of the S-shaped hook The apparatus for preventing vibration of an inclined cable according to claim 1 or 2, wherein the hook portion is the hook portion . Said locking member, said comprises the attachment portion by attaching projection at one end of the shaft portion, the other end of the shaft portion to claim 1 or 2, characterized in that it comprises the hook portion The apparatus for preventing vibration of the described inclined cable. 6. A method of attaching / detaching a vibration preventing device for an inclined cable according to claim 1, wherein a curved portion of the hook portion is fastened to the lower side surface of the inclined cable by a guide rope at a predetermined interval and rubber is attached to the attaching portion. one of a plurality of locking members in which one side is attached in a line are arranged, the other side of the rubber line fitted with one side in the mounting portion of the one locking member wound on the outer circumferential surface of the inclined cable said one locking member is fixed by engaging the hook portion of said one locking member, followed by another engagement fastened to hold a predetermined interval in a fixed said one locking member by utilizing the length of the stop member guide ropes disposed on the lower surface of the inclined cable in the above intervals, by winding a rubber wire attached to the mounting portion of the other of the locking member to the outer circumferential surface of the inclined cable The other side is engaged with the hook portion of the other locking member. Perform mounting of the vibration prevention apparatus by fixing the other engaging member by, at the time of removal of the anti-vibration device, the by pulling the lower end of the guide rope of each locking member which is fastened to the guide rope A method for attaching / detaching an anti-vibration device for an inclined cable, wherein the bending portion is pulled and removed by releasing each locking end from the other side of the rubber wire.

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