JP6029318B2 - Seismic control structure of utility pole - Google Patents

Description

  The present invention relates to a utility pole damping structure for attenuating vibration caused by an earthquake of a utility pole for a commercial power supply line, a utility pole for a railway overhead line (railway cable pole), and particularly a utility pole installed on a viaduct.

  Regarding the damping structure of the utility pole, for example, an additional mass section having a predetermined mass, a support section that positions the additional mass section apart in the longitudinal direction of the utility pole, and a vibration damping section provided in contact with the support section Patent Document 1 proposes a vibration damping device that has a natural frequency adjusted to be substantially equal to the natural frequency of a utility pole.

JP-A-2005-344452

  Incidentally, the vibration damping device proposed in Patent Document 1 adjusts its natural frequency to be substantially equal to the natural frequency of the utility pole. For example, a utility pole installed on a viaduct built on the ground When earthquake motion occurs, there is a possibility that a large vibration is generated in resonance with a viaduct vibration that can be amplified in the vicinity of the natural period. In addition, methods for reducing the vibration of utility poles installed on grounds, viaducts, etc., in the event of a large-scale earthquake (earthquake subject to the Special Measures Law for Large-Scale Earthquake Countermeasures) have not been fully studied. The actual situation is not. As shown in previous cases of earthquake damage such as the current (March 11th, 2011), when damage is caused to utility poles, overhead lines, etc., the structures themselves such as houses, buildings, viaducts, etc. Even if the damage is minor, it may take a long time to resume power supply to houses, buildings, etc., and resume train operation.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to attenuate the vibration of the utility pole when earthquake motion occurs, and for example, resonance between the viaduct built in the ground and the utility pole may occur. The purpose is to provide a seismic control structure for power poles that can eliminate the problem

  The seismic structure for a utility pole of the present invention includes a steel rod and a damper arranged in series, and the steel rod and the damper arranged in series are between the utility pole and the installation body on which the utility pole is installed. The damper has a cylinder, a piston arranged in the cylinder so as to define the cylinder in two chambers, a passage communicating the two chambers, and one end connected to the piston. And a first piston rod that slidably penetrates one end of the cylinder and protrudes out of the cylinder, and one end is connected to the piston and slidably penetrates the other end of the cylinder. A second piston rod having a diameter smaller than that of the first piston rod, and a compressible fluid accommodated inside the cylinder, and compressing the fluid. And its decay to its uncompressed state And application of a tension to the steel rods by the restoring force of the non-compressed state of the compressed compressible fluid with and generates a.

  According to the seismic structure of the utility pole of the present invention, in particular, a damping force is generated by compressing a compressible fluid housed in the cylinder and restoring it to an uncompressed state. Because the steel rod is tensioned by the restoring force of the compressible fluid to the incompressible state, the vibration of the utility pole can be attenuated during the occurrence of earthquake motion, and in particular, the resonance between the viaduct and the utility pole may occur. Can be lost.

  In the damping structure of the utility pole of the present invention, preferably, in addition to the steel rod and the damper, a turnbuckle is further arranged in series, and the compressible fluid accommodated in the damper is the turnbuckle of the turnbuckle. It is compressed by adjusting the length.

  In the seismic structure for a utility pole of the present invention, the utility pole may be an RC or PC utility pole, and the steel bar may be a PC steel pole.

  In one example, the installation body is the ground.In another example, the installation body is a viaduct built on the ground. When the installation body is the ground, the steel rod and the damper arranged in series are In the case where the installation body is a viaduct built on the ground, the steel rod and the damper arranged in series are stretched between the utility pole and the viaduct. The utility pole suitable for the present invention may be exemplified by a utility pole for supplying commercial power or a railway wire pole for feeding railway vehicles.

  The seismic structure of the utility pole according to the present invention has a set of steel rods and dampers arranged in series, preferably a set of such steel rods and dampers, and further a turnbuckle arranged in series with these. However, when the vibration damping function is dispersed or when the vibration damping function is increased, a plurality of these sets may be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration suppression of the utility pole at the time of generation | occurrence | production of a seismic motion can be attenuated, and the seismic structure of a utility pole which can eliminate the possibility of resonance between a viaduct and a utility pole can be provided.

FIG. 1 is an overall explanatory diagram of an example of an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional explanatory diagram mainly showing a damper of the example shown in FIG. FIG. 3 is an overall explanatory view of another example of the embodiment of the present invention.

  Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 and 2, the utility pole damping structure 1 of this example includes a viaduct 2 as an installation body constructed on the ground, and includes a steel rod 3, a damper 4, a turnbuckle 5 arranged in series, Is stretched between the utility pole 6 and the floor 2a of the viaduct 2. The steel rod 3 is made of a PC steel rod, and the utility pole 6 installed on the floor 2a of the viaduct 2 is made of a PC utility pole.

  The damper 4 includes a cylinder 11 and a compressible fluid 22 accommodated in the cylinder 11, and generates a damping force by compressing the fluid 22 and restoring it to an uncompressed state. Yes. Specifically, the damper 4 communicates the cylinder 11 with the piston 14 disposed in the cylinder 11 and the two chambers 12 and 13 so as to define the cylinder 11 into the two chambers 12 and 13. The passage 15 formed by a gap between the piston 11 and the piston 14 and the one end 16 are connected to the piston 14 and slidably penetrate the one end 17 of the cylinder 11 and protrude outside the cylinder 11. The piston rod 18 and one end portion 19 are connected to the piston 14 and slidably penetrate the other end portion 20 of the cylinder 11 and protrude outside the cylinder 11, and have a diameter smaller than the diameter of the piston rod 18. A piston rod 21, a compressible fluid 22 filled in the two chambers 12 and 13 of the cylinder 11, and an annular connecting member 2 fixed to the other end 23 of the piston rod 21. And a bottomed cylindrical member 25 fixed to the cylinder body 11 and a screw rod 27 fixed to the bottom portion 26 of the cylindrical member 25, and in the direction Z that is the direction in which the piston rods 18 and 21 extend. Stretchable and deformable. As described above, the passage 15 may consist of a gap between the cylinder 11 and the piston 14, but instead of or together with this, it may consist of a through hole formed in the piston 14, The compressible fluid 22 may be a silicon-based liquid such as silicon oil, may be a Bingham fluid, and may be a gas.

  The steel bar 3 made of a rigid steel material is fixed to a long steel bar main body 31, an annular connecting member 33 fixed to one end 32 of the steel bar main body 31, and the other end 34 of the steel bar main body 31. The screw rod 35 is integrally provided.

  The turnbuckle 5 is screwed to the screw rod 27 on the one hand, and is screwed to the screw rod 35 on the other hand, so that the turnbuckle 5 is interposed between the cylinder 11 and the utility pole 6. .

  The damper 4 is rotatably connected to the floor 2 a of the viaduct 2 via the shaft 51 by the annular connecting member 24, and thus the other end 23 of the small-diameter piston rod 21 is connected to the viaduct 2. The steel rod 3 is rotatably connected to the utility pole 6 via the shaft 52 by the annular connecting member 33. Thus, the viaduct 2 and the utility pole 6 are composed of the damper 4 and the turnbuckle. In addition to 5, the damper 4 and the turnbuckle 5 are connected via a steel bar 3 arranged in series.

  The turnbuckle 5 is rotated in the R direction around the axis X so that the screw rod 27 and the screw rod 35 come close to each other, and compresses the fluid 22 in the cylinder 11 to generate an internal pressure. The damper 4 is extended so as to resist the pulling force of the damper 4 and to position the piston 14 substantially at the center of the cylinder 11 in the axial direction, that is, the direction Z along the axis X. By adjusting the length of the turnbuckle 5 as described above, the compressible fluid 22 accommodated in the damper 4 is compressed, and the steel bar 3 is not compressed by the compressed compressible fluid 22. Tension is applied by the restoring force to the state. Further, the turnbuckle 5 can variably set the position in the direction Z of the piston 14 relative to the cylinder 11 by rotation in the R direction.

  The utility pole 6 extends in the direction V as a vertical direction, the utility pole base 61 is provided on the floor 2a of the viaduct 2, and the utility pole 62 is provided with a beam 64 extending in the horizontal direction to support the suspension wire 63. It has been. The beam 64 supports the suspension wire 63 at one end, and is attached to the utility pole upper part 62 at the other end. The beam 64 is cantilevered by the utility pole 6. The beam 64 extends toward the line 65 on the viaduct 2 in a direction Y as a direction perpendicular to the line on the viaduct 2.

  The steel rod 3 has a ring-shaped connecting member 33 rotatably connected to a portion below the beam 64 of the utility pole 6. In this example, the damper 4 is rotatably connected to the floor 2a of the viaduct 2 so that the annular connecting member 24 faces the utility pole base 61 in the direction Y. For example, the damper 4 extends from the utility pole base 61 in the direction Y. When the damper 4 cannot be connected to the floor 2a of the viaduct 2 at a predetermined distance away, the damper 4 is connected to the floor 2a of the viaduct 2 at a site rotated around the utility pole base 61 with respect to the site. You may let them.

  As described above, the steel rod 3, the damper 4, and the turnbuckle 5 stretched on the viaduct 2 and the utility pole 6 extend in a direction Z inclined with respect to the vertical direction V.

  In the above-described utility pole vibration control structure 1, when the tensile force in the direction Z is not applied to the connecting member 24 or the connecting member 33, in other words, the damper 4 connects the connecting member 24 and the connecting member 33 with respect to the direction Z. If the external force to be separated from each other is not applied, it is possible with respect to the direction Z by the own force toward the one end 17 applied to the piston 14 due to the difference in pressure receiving area in the two chambers 12 and 13, that is, the own pulling force with respect to the direction Z It becomes a state contracted to a minimum. When the external force that tries to separate the connecting member 24 and the connecting member 33 from each other with respect to the direction Z is larger than its own force toward the one end 17 applied to the piston 14 due to the difference in the pressure receiving area in the two chambers 12 and 13, The member 24 and the connecting member 33 are separated from each other in the direction Z, and the damper 4 is extended in the direction Z. On the other hand, after the extension, the connecting member 24 and the connecting member 33 are separated from each other in the direction Z. When the external force to be reduced is smaller than its own pulling force, the damper 4 is contracted in the direction Z. In this expansion and contraction, the damper 4 attenuates the kinetic energy applied to the damper 4 as quickly as possible by the movement of the fluid 22 between the chamber 12 and the chamber 13 through the passage 15.

  In the damping structure 1 of the utility pole, the damper 4 is like a rigid body unless an extension force exceeding the force based on the area difference between the large-diameter piston rod 18 and the small-diameter piston rod 21 and the pressure of the fluid 22 is applied from the outside. Therefore, for example, when the power pole 6 attached to the connecting member 33 can be firmly held, and when a further extension force is applied from the outside due to an earthquake or the like, the kinetic energy of the power pole 6 can be transferred by the fluid 22 through the passage 15. It can absorb as quickly as possible to attenuate the motion (vibration) of the utility pole 6 due to an earthquake or the like, and the damper 4 can reduce the area difference between the large-diameter piston rod 18 and the small-diameter piston rod 21 and the fluid 22. Since the force based on the pressure, that is, its own pulling force is applied to the utility pole 6, the moved utility pole 6 can be returned to the original position. Due to the action of the control structure 1 of the utility pole, resonance between the viaduct 2 and the utility pole 6 that are vibrated by the earthquake motion can be prevented.

  Further, in the utility pole damping structure 1, the turnbuckle 5 is rotated in the R direction to change the position in the direction Z of the piston 14 with respect to the cylinder 11 to reset or adjust the tensile force of the damper 4. The damper 4 can provide the optimum tensile force for the vibration control structure 1.

  In the above example, the connecting member 24 is connected to the floor 2a of the viaduct 2 and the connecting member 33 is connected to the utility pole 6. Instead, the connecting member 24 is connected to the utility pole 6 and the connecting member 33 is connected to the floor 2a of the viaduct 2. You may connect.

  In the damping structure 1 of the utility pole 6 installed on the floor 2a of the viaduct 2 in this example, the steel rod 3 and the damper 4 arranged in series are stretched between the utility pole 6 and the viaduct 2, and the damper 4 includes a cylinder 11 and a compressible fluid 22 accommodated in the cylinder 11, and generates a damping force by compressing the fluid 22 and restoring it to an uncompressed state. Since the steel bar 3 is tensioned by the restoring force of the compressed compressible fluid 22 to the non-compressed state, the vibration of the utility pole 6 can be suitably damped and the occurrence of seismic motion It is possible to eliminate the possibility of resonance between the viaduct 2 and the utility pole 6 at the time.

  In the above, the viaduct 2 constructed on the ground as an installation body and the electric pole 6 (railway electric wire pole) installed on the viaduct 2 as an electric pole are illustrated respectively. However, the installation body may be the ground itself, It may be a utility pole for a commercial power supply line or a utility pole (railway cable pole) for a railway overhead line laid on the ground.

  Further, the above example has one set of the steel bar 3, the damper 4 and the turnbuckle 5. Instead of this, for example, as shown in FIG. The structure 1 may be configured, and in the damping structure 1 of the example shown in FIG. 3, one set of the steel rod 3, the damper 4 and the turnbuckle 5 extends in the Y direction and passes through the center of the utility pole 6. The steel rod 3, the damper 4 and the turnbuckle 5 of the other set are also stretched symmetrically with respect to the line 71 with respect to the line 71 with respect to the line 71 in plan view. In the example shown in FIGS. 1 and 2, the connecting member 24 is rotatably connected to the floor 2a of the viaduct 2 outside the line 65 and the utility pole base 61 in the direction Y. As shown in FIG. 3, the connecting member does not hinder the traveling of the train. 24 may be rotatably connected to the floor 2 a between the line 65 and the utility pole base 61.

  In the damping structure 1 shown in FIG. 3 in which each of the set of the steel bar 3, the damper 4 and the turnbuckle 5 is stretched with an angle θ with respect to the line 71, in addition to the vibration in the direction Y, the line 65 extends in the extending direction. The vibration of the utility pole 6 can also be attenuated.

1 Seismic control structure 2 Viaduct 2
3 Steel bar 4 Damper 5 Turn buckle 11 Cylinder 22 Fluid

Claims (4)

The steel rod and the damper arranged in series are provided, and the steel rod and the damper arranged in series are stretched between the railway electric wire column and the viaduct where the railway electric wire column is installed, The damper has a cylinder, a piston arranged in the cylinder so as to define the cylinder in two chambers, a passage communicating with the two chambers, one end connected to the piston, and one end of the cylinder A first piston rod that slidably passes through the cylinder and protrudes out of the cylinder, and is connected to the piston at one end and slidably passes through the other end of the cylinder and protrudes out of the cylinder. A second piston rod having a diameter smaller than that of the first piston rod, a compressible fluid housed in the cylinder, and a connecting member fixed to the other end of the second piston rod. And the pressure of the fluid. And imparts tension to the steel rods by the restoring force of the non-compressed state of the compressible fluid is compressed with and generates a damping force by the restoring to the non-compressed state, the damper, The connecting member is pivotally connected to the viaduct via the shaft, and the railway electric pole extends in the vertical direction. The electric pole base of the electric railway pole is provided on the viaduct, Is provided with a beam extending in the horizontal direction to support the suspension line, and the beam is cantilevered by the railway electric wire pillar and extends toward the line on the viaduct in the direction perpendicular to the line on the viaduct. The connecting member is a seismic damping structure for a railway electric wire pole that is rotatably connected to a viaduct so as to face the electric pole base of the electric railway pole in the direction perpendicular to the track . In addition to the steel rod and the damper, and further turnbuckle is arranged in series, compressible fluid contained inside the damper, according to claim 1, which is compressed by the length adjustment of the turnbuckle Control structure of railway electric poles in Japan. The seismic damping structure for a railway electric pole according to claim 1 or 2, wherein the railway electric pole is an RC or PC electric pole. The seismic damping structure for a railway electric wire column according to any one of claims 1 to 3, wherein the steel bar is a PC steel bar.

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