JP6755594B2 - Cover for damping device - Google Patents

Description

The present invention relates to a cover for a vibration damping device that covers a vibration damping device provided at a cable fixing portion of a bridge such as a cable-stayed bridge.

As shown in FIG. 8, the cable-stayed bridge in which the bridge girder P is supported by a plurality of cables 4 attenuates the vibration of the cable 4 in the cable fixing portion 5 that connects the fixing pipe 50 and the cable 4 provided in the bridge girder P. A vibration damping device 6 for this purpose is provided. The vibration damping device 6 is formed of a highly viscous elastic material between the opposite surfaces of the cable flange 64 ringed on the outer circumference of the cable 4 and the fixing pipe flange 65 ringed on the outer circumference of the fixing pipe 50. A plurality of columnar vibration absorbers, so-called high damping rubbers 66, are sandwiched between them, and the movement of the cable flange 64 to be radially displaced with respect to the fixing pipe flange 65 due to the vibration of the cable 4 is the high damping rubber. It is configured to absorb and attenuate at 66.

However, if the vibration absorbing member 66 is continuously exposed to heat from direct sunlight, ultraviolet rays, acid rain, sea breeze, etc., the vibration absorbing member 66 deteriorates faster, and there is a risk that the desired vibration damping performance cannot be maintained for a long period of time. Therefore, the vibration damping device 6 is entirely covered with the vibration damping device cover 7.

As shown in FIGS. 9 and 10, conventionally, in the vibration damping device cover 7, a substantially truncated cone-shaped cover body 70 having both ends opened and one end opening 70A of the cover body 70 formed along the peripheral edge. A ring-shaped cable holding portion 71 to be formed and a ring-shaped fixing tube holding portion 72 formed along the peripheral edge of the other end opening 70B of the cover body 70 are provided, and the cable holding portion 71 is connected to the cable 4. It is known that the fixing tube holding portion 72 is wrapped around the outer periphery of the fixing tube 50 so as to be held and fixed to the cable fixing portion 5 (for example, Patent Document 1). And 2).

JP-A-2018-87449 Japanese Unexamined Patent Publication No. 2003-74012

In the conventional cover 7 for a vibration damping device, the peripheral wall 7S is divided by a dividing portion 73 from one end opening 70A to the other end opening 70B, and the divided portion 73 is opened to cover the outside of the vibration damping device 6. Further, a pair of rib-shaped fastening flanges 74 that are continuous along both end edges of the split portion 73 are formed on the outer peripheral surface 700 of the cover body 70, and the cover 7 for the vibration damping device is controlled as described above. After covering the outside of the vibration device 6, the fastening flanges 74 are fastened and fixed to each other by a plurality of fixing bolts 8. As a result, the vibration damping device cover 7 is held and fixed to the cable fixing portion 5.

Further, although not shown, a tightening band is wound around the outer circumferences of the cable holding portion 71 and the fixing pipe holding portion 72, respectively, whereby the vibration damping device cover 7 is twisted with respect to the cable 4 and the fixing pipe 50. It is firmly held and fixed. Further, a caulking material for preventing rainwater, dust, etc. from entering the vibration damping device cover 7 is applied to the bolt mounting holes 75 of the split portion 73 and the fastening flange 74.

By the way, since the high damping rubber 66 of the vibration damping device 6 is constantly subjected to shear stress from the radial direction due to the vibration of the cable 4, it is necessary to periodically check for deterioration or damage. However, in the conventional cover 7 for the vibration damping device, in order to inspect the vibration damping device 6, the tightening band wound around the cable 4 and the fixing pipe 50 is removed, and the split portion 73 and the bolt mounting hole 75 are provided. After removing the applied caulking material and further removing all the fixing bolts 8 from the fastening flange 74, the fixing bolts 8 had to be opened at the split portion 73 and removed from the cable fixing portion 5, which was troublesome.

The present invention has been made in view of the above problems, and an object of the present invention is to workability when inspecting a vibration damping device in a cover for a vibration damping device that covers a vibration damping device provided at a cable fixing portion of a bridge. Is to improve.

The cover for the vibration damping device according to the present invention is
A cover for a vibration damping device that is attached to the cable fixing part of a bridge.
A cover body that covers the vibration damping device provided in the cable fixing part, and
A cable holding part that forms the peripheral edge of one end opening of the cover body and is attached to the cable.
A fixing pipe holding part that constitutes the peripheral edge of the other end opening of the cover body and is attached to the fixing pipe of the bridge girder.
A split portion that divides the cover body from one end opening to the other end opening,
It is provided with a fastening flange that protrudes in the outer radial direction from both end edges of the split portion and for fixing the split portion in a closed state.
The cover body is formed in a bellows shape with continuous unevenness in the axial direction, and is configured to be expandable and contractible in the axial direction.
The fastening flange is divided into a plurality of bellows convex portions on the outer peripheral surface of the cover body portion.

According to the above-mentioned cover for the vibration damping device, the vibration damping device can be exposed to the outside by compressing and deforming the cover body in the axial direction. Therefore, when inspecting the vibration damping device, a split portion or a bolt is attached. There is no need to remove the coking material applied to the holes, remove the fixing bolts from the fastening flanges, or remove the anti-vibration device cover from the cable anchorage. Moreover, in this case, since the fastening flange is separately provided for each bellows convex portion formed on the outer peripheral surface of the cover body portion, the fastening flange hinders the compression deformation of the cover body portion in the axial direction. It is hard to become. Therefore, the vibration damping device can be more easily exposed to the outside.

Preferably, an inner rib is provided that projects in the inner radial direction in an annular shape along the inner peripheral surface of the fixing tube holding portion and contacts the annular surface on the outer periphery of the fixing tube.

In this case, the contact friction between the fixing tube and the fixing tube holding portion is smaller than that in which the entire inner peripheral surface of the fixing tube holding portion is in surface contact with the annular surface on the outer periphery of the fixing tube. Since it can be made smaller, the fixing tube holding portion can be more smoothly removed from the fixing tube.

Preferably, a groove portion is provided on the outer surface of the peripheral wall of the cover body portion so as to be recessed in the inner radial direction along the divided portion.

In this case, since an appropriate amount of caulking material can be uniformly applied along the split portion, it is possible to reliably prevent rainwater, dust, etc. from entering the cover for the vibration damping device through the split portion. In addition, the workability of the caulking process of the divided portion is also improved.

As described above, according to the present invention, the vibration damping device can be exposed to the outside only by compressing and deforming the cover body in the axial direction, so that the workability when inspecting the vibration damping device is remarkably improved. improves.

FIG. 1 is a perspective view showing a state in which the cover for the vibration damping device according to the embodiment of the present invention is attached to the cable fixing portion. FIG. 2 is a side sectional view showing a state in which the cover for the vibration damping device according to the embodiment of the present invention is attached to the cable fixing portion. FIG. 2 is a side sectional view showing a state in which the vibration damping device cover according to the embodiment of the present invention is compressed and deformed in the axial direction. FIG. 4 is a side view of the periphery of the fastening flange of the cover for the vibration damping device according to the embodiment of the present invention. FIG. 5 is a side view of the periphery of the fastening flange when the vibration damping device cover according to the embodiment of the present invention is compressed and deformed in the axial direction. FIG. 6 is an upward cross-sectional view of the periphery of the divided portion of the cover for the vibration damping device according to the embodiment of the present invention. FIG. 7 is an upward cross-sectional view of the periphery of the fastening flange of the cover for the vibration damping device according to the embodiment of the present invention. FIG. 8 is a diagram showing a usage state of the conventional vibration damping device cover. FIG. 9 is a side view showing a state in which the conventional vibration damping device cover is attached to the cable fixing portion. FIG. 10 is an upward view of a conventional vibration damping device cover.

Next, the cover for the vibration damping device according to the embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the vibration damping device cover 1 according to the embodiment of the present invention has a substantially truncated cone-shaped cover body 10 having both ends open and one end opening 10A of the cover body 10. A ring-shaped cable holding portion 11 forming a peripheral edge portion and a ring-shaped fixing tube holding portion 12 forming a peripheral edge portion of the other end opening 10B of the cover body portion 10 are provided, and the cable holding portion 11 is provided. By ringing the outer circumference of the cable 4 and ringing the fixing pipe holding portion 12 on the outer circumference of the fixing pipe 50 provided on the bridge girder, the fixing pipe holding portion 12 is held and fixed to the cable fixing portion 5. Further, metal tightening bands 51 and 52 are wound around the outer circumferences of the cable holding portion 11 and the fixing tube holding portion 12, respectively. As a result, the vibration damping device cover 1 is more firmly held and fixed to the cable 4 and the fixing pipe 50. In the present specification, the extension direction (axis direction) of the central axis CL of the vibration damping device cover 1 is the vertical direction of the vibration damping device cover 1, and the direction orthogonal to the central axis CL (radial direction) is the vibration damping device. It is defined as the side of the cover 1.

As shown in FIG. 2, on the outer circumference of the cable 4, an edge side adjustment ring 54, which is a seal ring made of a soft material such as natural rubber or silicon-based synthetic rubber, is ring-fixed and fixed. The outer peripheral surface 540 of 54 constitutes an annular surface on the outer periphery of the intermediate portion of the cable 4. The cable holding portion 11 is fixed in a state where the inner peripheral surface 110 is in contact with the outer peripheral surface 540 of the edge side adjusting ring 54, whereby watertightness between the cable holding portion 11 and the cable 4 is ensured. ..

A single or a plurality of rib-shaped engaging protrusions 541 projecting in the outer radial direction are formed on the outer peripheral surface 540 of the edge side adjusting ring 54. On the other hand, the inner peripheral surface 110 of the cable holding portion 11 is formed with a single or a plurality of engaging grooves 111 that are recessed in the outer radial direction, and the engaging projections 541 are fitted into the engaging grooves 111. The movement of the cable holding portion 11 with respect to the edge side adjusting ring 54 in the axial direction is prevented.

Similar to the cable 4, a large mouth side adjusting ring 55 which is a seal ring made of a soft material is ring-fixed on the outer periphery of the end of the fixing pipe 50, and the outer peripheral surface 550 of the large mouth side adjusting ring 55 is the fixing pipe 50. It constitutes an annular surface on the outer periphery of the end of the wire. The fixing pipe holding portion 12 is fixed in a state where a plurality of inner ribs 121 formed on the inner peripheral surface 120 are in contact with the outer peripheral surface 550 of the large mouth side adjusting ring 55, whereby the fixing pipe holding portion 12 and the fixing pipe holding portion 12 are fixed. Watertightness with the pipe 50 is ensured.

The inner rib 121 is a protrusion having a substantially triangular vertical cross section formed so as to protrude in the inner radial direction in an annular shape along the inner peripheral surface 120 of the fixing tube holding portion 12, and a tightening band 52 is formed on the fixing tube holding portion 12. In the unwound state, the inner peripheral edge portion comes into contact with the outer peripheral surface 550 of the large mouth side adjusting ring 55. On the other hand, when the tightening band 52 is wound around the fixing tube holding portion 12, the inner rib 121 is pressed against the large mouth side adjusting ring 55 and elastically deformed, and a wider range is the outer circumference of the large mouth side adjusting ring 55. Contact surface 550. That is, if the tightening band 52 is wound around the fixing tube holding portion 12, the contact area between the inner rib 121 and the large mouth side adjusting ring 55 increases, and if the tightening band 52 is removed from the fixing tube holding portion 12, the above It is configured to reduce the contact area.

The vibration damping device cover 1 is entirely made of a soft material such as natural rubber, silicon-based synthetic rubber, ethylenepropylene diene-based synthetic rubber, and chloroprene-based synthetic rubber, and is used for vibration damping when attached to the cable fixing portion 5. It has flexibility that allows it to be elastically deformed relatively easily when inspecting the device 6.

The cover peripheral wall 1S, which is the peripheral wall of the vibration damping device cover 1, is divided by one divided portion 13 from one end opening 10A to the other end opening 10B, and the vibration damping device cover 1 is attached to the cable fixing portion 5. At that time, the split portion 13 is opened and put on the outside of the vibration damping device 6.

The cover body 10 is formed in a bellows shape in which the diameter is increased from the cable holding portion 11 toward the fixing tube holding portion 12 and the unevenness is continuous in the axial direction, and is within a predetermined range in the axial direction (for example, vibration suppression). It can be compressed and deformed within the range until the axial dimension (length) of the device cover 1 becomes about 3/5 of the normal time.

In the vibration damping device 6, the cable flange 64 ringed on the outer periphery of the cable 4, the fixing tube flange 65 ringing on the outer periphery of the end of the fixing tube 50, and the cable flange 64 and the fixing tube flange 65 facing each other. It is composed of a plurality of high damping rubbers 66 sandwiched between the surfaces, and the fixing pipe flange 65 is arranged face-to-face with the cable 4 side of the large mouth side adjusting ring 55. That is, the vibration damping device 6 is arranged adjacent to the cable 4 side of the large mouth side adjusting ring 55. Therefore, as shown in FIG. 3, with the tightening band 52 of the fixing pipe holding portion 12 removed, the fixing pipe holding portion 12 is pulled out from the large opening side adjusting ring 55 of the fixing pipe 50 to the cable 4 side, and the cover body is covered. When the portion 10 is compressed and deformed in the axial direction to a predetermined length or less, the vibration damping device 6 is exposed to the outside through the gap between the fixing pipe holding portion 12 and the large mouth side adjusting ring 55.

A fastening flange for fastening and fixing the split portion 13 in a state of protruding in the outer radial direction from both end edges 131 of the split portion 13 and being closed by the fixing bolts 8 on the outer peripheral surface 100 of the body portion, which is the outer peripheral surface of the cover body portion 10. 14 is formed. A plurality of bellows convex portions 101 (here, five) having a substantially triangular cross section in the lateral view are formed on the outer peripheral surface 100 of the body portion, and the fastening flange 14 is a slope on the cable 4 side of each bellows convex portion 101. The upper slope portion 102, which is a portion, is provided separately.

As shown in FIG. 4, the fastening flange 14 is a laterally-viewed substantially triangular projecting piece having a bolt mounting hole 15, and is a cable in a mounted state in which the cover body 10 is not compressed and deformed in the axial direction. A gap R that widens outward is formed between the upper edge portion 142 that is the side edge portion on the 4th side and the lower slope portion 103 that is the slope portion on the fixing tube 50 side of the bellows convex surface portion 101. Therefore, as shown in FIGS. 3 and 5, the vibration damping device cover 1 is compressed to a length in which the upper edge portion 142 of the fastening flange 14 comes into contact with the lower slope portion 103 of the bellows convex surface portion 101 and the gap R disappears. It can be transformed.

As shown in FIG. 6, in the split portion 13, the outer corner portions of both end edges 131 are formed in a tapered shape, and when the split portion 13 is closed, the outer surface of the cover peripheral wall 1S is along the split portion 13. A groove portion 16 having a substantially V-shaped cross section is formed so as to be recessed in the inner radial direction.

As shown in FIG. 7, the groove portion 16 is provided in the entire formation region of the division portion 13 including the outer surface of the fastening flange 14, and after the vibration damping device cover 1 is held and fixed to the cable fixing portion 5, the groove portion 16 is provided. A caulking material 9 such as a silicon-based resin is applied. Similarly, the caulking material 9 is applied to the bolt mounting holes 15 of the fastening flanges 14 after the fastening flanges 14 are fastened and fixed to each other with the fixing bolts 8.

As described above, according to the vibration damping device cover 1, after removing the tightening band 52 of the fixing pipe holding portion 12, the fixing pipe holding portion 12 is moved from the large mouth side adjusting ring 55 of the fixing pipe 50 to the cable 4 side. Since the vibration damping device 6 can be exposed to the outside by pulling out and compressing and deforming the cover body 10, the vibration damping device 6 was applied to the split portion 16 and the bolt mounting hole 15 when the vibration damping device 6 was inspected. It is not necessary to remove the coking material 9, remove the fixing bolt 8 from the fastening flange 14, or remove the vibration damping device cover 1 from the cable fixing portion 5. As a result, workability when inspecting the vibration damping device 6 is significantly improved.

Moreover, since the fastening flange 14 is provided separately for each bellows convex surface portion 101 formed on the outer peripheral surface 100 of the body portion, the fastening flange 14 hinders the compression deformation of the cover body portion 10 in the axial direction. The vibration damping device 6 can be more easily exposed to the outside. As a result, workability when inspecting the vibration damping device 6 is further improved.

Further, in the vibration damping device cover 1, the inner rib 121 formed in an annular shape along the inner peripheral surface 120 of the fixing pipe holding portion 12 is configured to abut along the outer peripheral surface 550 of the large mouth side adjusting ring 55. Therefore, the contact friction between the fixing pipe 50 and the fixing pipe holding portion 12 is small, and the fixing pipe holding portion 12 can be more smoothly removed from the fixing pipe 50. As a result, workability when inspecting the vibration damping device 6 is further improved.

Further, in the vibration damping device cover 1, the outer surface of the cover peripheral wall 1S is provided with a groove portion 16 which is recessed in the inner radial direction along the divided portion 13, so that the cover 1 is uniformly suitable along the divided portion 13. Since an amount of the caulking material 9 can be applied, it is possible to surely prevent rainwater, dust, etc. from entering the vibration damping device cover 1 through the dividing portion 13, and the workability of the caulking treatment of the dividing portion 13 is also improved. improves.

In the above embodiment, the cover body 10 is formed in a bellows shape composed of five bellows convex portions 101, but the cover body portion 10 is smoothly compressed and deformed within a predetermined range in the axial direction to suppress vibration. If the device 6 can be exposed to the outside through the gap between the fixing tube holding portion 12 and the large mouth side adjusting ring 55, the device 6 may be formed in a bellows shape composed of four or less bellows convex portions 101. , It may be formed in a bellows shape composed of six or more bellows convex portions 101.

Further, in the above embodiment, the fixing tube holding portion 12 is provided with a plurality of inner ribs 121 having a substantially triangular vertical cross section along the inner peripheral surface 120, but the fixing tube holding portion 12 and the fixing tube holding portion 12 are fixed. If watertightness with the pipe 50 is ensured and the fixing pipe holding portion 12 can be smoothly removed from the fixing pipe 50, only one inner rib 121 is provided along the inner peripheral surface 120. Alternatively, the inner rib 121 having a substantially trapezoidal vertical cross section or a substantially semicircular shape may be provided along the inner peripheral surface 120.

Further, in the above embodiment, the fastening flange 14 has been described as being separately provided on the upper slope portion 102 of each bellows convex surface portion 101, but is divided into the lower slope portion 103 of each bellows convex surface portion 101. It may be provided separately on the top surface portion between the upper slope portion 102 and the lower slope portion 103 in each bellows convex surface portion 101.

Further, in the above embodiment, the groove portion 16 is provided in the entire formation region of the division portion 13 including the outer surface of the fastening flange 14, but rainwater is contained in the vibration damping device cover 1 through the division portion 13. If it is possible to reliably prevent dust and the like from entering, it is provided only in the formation area of the other divided portion 13 except for the outer surface region of the fastening flange 14 which is firmly pressed by the tightening force of the fixing bolt 8. It may be the one that was given.

1 Cover for vibration damping device 1S Cover peripheral wall 4 Cable 5 Cable fixing part 6 Vibration damping device 10 Cover body 10A One end opening 10B Another end opening 11 Cable holding part 12 Fixing pipe holding part 13 Dividing part 14 Fastening flange 16 Groove 50 Fixing pipe 100 Body outer peripheral surface 101 Bellows convex surface 121 Inner rib 131 Edge edge

Claims (3)

A cover for a vibration damping device that is attached to the cable fixing part of a bridge.
A cover body that covers the vibration damping device provided in the cable fixing part, and
A cable holding part that forms the peripheral edge of one end opening of the cover body and is attached to the cable.
A fixing pipe holding part that constitutes the peripheral edge of the other end opening of the cover body and is attached to the fixing pipe of the bridge girder.
A split portion that divides the cover body from one end opening to the other end opening,
It is provided with a fastening flange that protrudes in the outer radial direction from both end edges of the split portion and for fixing the split portion in a closed state.
The cover body is formed in a bellows shape with continuous unevenness in the axial direction, and is configured to be expandable and contractible in the axial direction.
The fastening flange is a cover for a vibration damping device provided separately for each of a plurality of bellows convex portions on the outer peripheral surface of the cover body. In the cover for the vibration damping device according to claim 1,
A cover for a vibration damping device provided with an inner rib that projects in the inner radial direction in an annular shape along the inner peripheral surface of the fixing pipe holding portion and contacts the annular surface on the outer periphery of the fixing pipe. In the cover for the vibration damping device according to claim 1 or 2.
A cover for a vibration damping device in which a groove portion that is recessed in the inner radial direction along the divided portion is provided on the outer surface of the peripheral wall of the cover body portion.

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