JP3811477B2 - Pole support structure - Google Patents

Description

Lighting, obstacle lights, antennas, emergency broadcast facility, relates to a support structure for supporting to reportage Lumpur power lines.

The structure of the pole that supports the lighting, aviation obstacle light, antenna, emergency broadcasting equipment, and power transmission line at a height of 20 to 100 m consists of a single pillar as shown in FIGS. 3 (a) and 3 (b). In the case of a pole, a support structure of a branch line support type for supporting a branch line composed of three or more wire ropes or the like in an obliquely downwardly-opened manner from above or in the middle of the pole, and FIG. 3 (c), There is known a truss type support structure in which a tower as shown in (d) is assembled in a shape steel material or a steel pipe in a truss shape, and a combination of the truss type support structure and the support structure of the branch line support type. .
Japanese Utility Model Publication No. 6-35912

In the conventional support structure of the branch line support type, the ground fulcrum that supports the end of the branch line becomes wide and requires a large installation area.
In addition, the truss-type support structure requires a large amount of steel because the wind receiving area is large, resulting in high costs.

  It is an object of the present invention to provide a low-cost pole support structure that has high wind pressure resistance, reduces the installation area, and solves the problems of the prior art.

  In order to solve the above problems, the present invention is configured as follows.

According to the first aspect of the present invention, in the support structure of the pole, a bundle member extending in an appropriate length horizontally in the lateral direction around the pole is fixed to the outer periphery of the pole, and the bundle member is arranged at a predetermined interval in the vertical direction of the pole. A plurality of stages are installed, and a string material is installed with initial introduction tension between the upper end of the pole, the free ends of the bundles of the plurality of stages, and an anchor provided on the ground, and is installed in the vertical direction of the pole. The initial introduction tension of the string material installed in each section between the bundle materials installed in a plurality of stages is controlled so as to increase from the upper side to the lower side .

This second invention is a support structure for a pole for lighting, an aerial obstacle light, an antenna, an emergency broadcast facility, and a transmission line, and extends horizontally in the horizontal direction around the pole. The bundle member is fixed to the outer periphery of the pole, the bundle member is installed in a plurality of stages at predetermined intervals in the vertical direction of the pole, and provided on the upper end of the pole, the free end of the bundle member of the plurality of stages, and the ground. Install the string material with the initial introduction tension between the anchor and the initial introduction tension of the string material installed in each section between the bundle material installed in multiple stages in the vertical direction of the pole as it goes from top to bottom It is controlled so that it may become large .

  According to the third aspect of the present invention, in the pole support structure according to the first or second aspect of the present invention, a bundle extending horizontally for an appropriate length in the horizontal direction around the pole is extended radially in at least three directions. It is characterized by.

  According to the fourth aspect of the present invention, in the pole support structure according to any one of the first to third aspects of the present invention, at least one vibration damping device is provided above the pole to suppress resonance. It is characterized by.

In the configuration of the present invention, the string material as a branch line is installed with an initial introduction tension between the anchor installed on the ground and the bundle fixed to the pole, so that the upward deformation of the bundle is suppressed, and the bundle By suppressing the upward deformation of the material, a bending moment that resists the deformation of the pole due to the wind is generated at the joint of the pole, and as a result, the restraining effect of suppressing the deformation when the pole is subjected to the wind. It can be demonstrated and has the effect of having high wind resistance.
In addition, since the string material as the branch line is installed almost vertically between the free end of the bundle and the anchor installed on the ground, it is possible to prevent deflection due to the weight of the branch line of the prior art and to reduce the opening of the branch line. Therefore, the installation area can be reduced.
The construction is possible at low cost because the bundle material is fixed to the pole and the string material is simply installed between the end of the bundle material and the anchor installed on the ground.
Since the initial introduction tension of the string material installed in each section between bundles installed in multiple stages in the vertical direction of the pole is controlled to increase from the top to the bottom, the effect of suppressing the deformation of the pole increases. The initial introduction tension applied to the string material installed between the bottom bundle material and the anchor installed on the ground is not excessive, and there is no need to increase the strength of the anchor. Play.
In addition, since at least one vibration damping device is provided on the top of the pole to suppress resonance, the amplitude at the time of resonance of the pole can be significantly reduced even if the height of the pole is increased. Therefore, deformation of the pole top can be suppressed to a small extent.

An embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the pole 1 that supports the lighting, the aviation obstacle light, the antenna, the emergency broadcasting facility, and the power transmission line reaches 20 to 100 m, and is configured by connecting a plurality of steel pipes or the like. The In the vicinity of a joint such as a plurality of steel pipes, a bundle 2 extending horizontally for an appropriate length around the steel pipe is installed with its end fixed to the outer periphery of the steel pipe. In FIG. 1, four bundle members 2 are fixed at equal intervals. Since the bundle 2 is fixed in the vicinity of a joint such as a steel pipe constituting the pole 1, the plurality of bundles 2 are installed in the vertical direction of the pole 1 at substantially equal intervals. The length of the bundle 2 in the horizontal direction is slightly shortened in the upper bundles 2 of the pole 1 and the length of the bundle 2 in the lower part of the pole 1 is longer than that. The horizontal extending lengths of the plurality of bundles 2 at the bottom of the pole 1 are made substantially the same. The installation position of the anchor installed on the ground is almost directly below the free end of the lowermost bundle 2. Therefore, the string material 3 such as a wire rope installed between the upper end of the pole 1, the free end of the bundle, and the anchor installed on the ground is installed with a small root opening.

  Between the upper end of the pole 1 and the uppermost bundle 2, between the uppermost bundle 2 and the second bundle from the top, ..., the second bundle 2 from the bottom and the lowermost An initial introduction tension that increases from the upper side to the lower side is applied to the string material 3 installed in each section with the bundle material 2. Before assembling the pole 1 by connecting a plurality of steel pipes, the poles 1 are connected by connecting a plurality of steel pipes while applying a predetermined initial introduction tension to the string material 3 between the bundle material 2 and the bundle material 2 for each section. , The pole 1 is erected on the foundation of the ground, and a predetermined initial introduction tension is applied to the string member 3 between the lowermost bundle member 2 and the anchor installed on the ground to complete the installation of the pole 1. . By adopting such a construction procedure, it becomes easy to control the initial introduction tension applied to each section.

  As shown in FIG. 2 (b), the support structure for the pole of the present invention is applied to the sections between the bundles of the plurality of stages of the pole 1 by applying an initial introduction tension that increases from the upper side to the lower side. Therefore, when the wind strikes the pole 1, the free end of the bundle member 2 on the windward side tends to be deformed upward, but the string material 3 installed between the bundle members 2 is Bending moment like an arrow resisting deformation of the pole 1 is generated at the joint portion of the steel pipe constituting the pole 1 while suppressing upward deformation, and the deformation of the pole 1 due to wind can be reduced.

  By the way, normally, the horizontal deformation caused by the wind of the high pole, particularly the horizontal deformation at the top, is 1/100 (allowable value) of the pole height as shown by the dotted line (A) in FIG. Although it is considered as a guideline of the design to suppress below, when the height of the pole 1 exceeds 80 m, the deformation of the top of the pole 1 becomes large due to the influence of resonance at the time of vibration due to wind. For example, as shown in FIG. 4, when there is no string material 3, it looks like a broken line (A), and when there is a string material and resonance occurs, it looks like a broken line (B) marked with a black circle. If there is a vibration control device at the top and resonance does not occur, it will be as shown by the black triangle mark (c).

  As can be seen from FIG. 4, when the vibration damping device is provided on the top of the pole 1, even if the pole 1 vibrates due to wind, the deformation of the top of the pole can be remarkably suppressed, and therefore the pole 1 is damaged by resonance. Can be prevented, and the durability of the pole 1 can be improved. One damping device may be provided on the top of the pole 1 or a plurality of damping devices may be provided in the vertical and horizontal directions.

  When attaching at least one vibration damping device to the top of the pole 1, as shown in FIG. 5 (a), it may be an external type in which a vibration damping device 4 is provided at the upper end of the pole 1, As shown in FIG. 5 (b), a built-in type in which a damping device 4 is provided inside the steel pipe constituting the pole 1 can be used.

  As one form of the structure of the vibration damping device 4 attached to the pole 1, for example, as shown in FIG. 6, the viscous damping liquid 6 and the first and second compressions are contained in a storage container 5 whose inside is sealed. A weight 9 may be provided which is disposed and engaged between the coil springs 7 and 8 and the first and second compression coil springs 7 and 8 and moves in the viscous damping liquid 6. The base ends of the first and second compression coil springs 7 and 8 are respectively annular support portions fixed to the upper surface of the bottom plate 11 or annular supports fixed to the lower surface of the top plate 10 serving as a lid. Positioned and positioned within the unit. The weight 9 has an annular overhanging flange portion at the center portion, and is provided with a truncated cone-shaped body in the upper and lower portions so as to be easily fitted and installed. The top plate 10 is detachably fixed to the main body side of the storage container 5 by a plurality of bolts and nuts 16 to seal the inside of the storage container 5.

  5A and 6, the steel top plate 15 for supporting the vibration damping device is fixed to the upper end of the pole 1, and the bottom plate 11 of the storage container 5 is attached to and detached from the top plate 15 with a plurality of bolts and nuts 12. A possible mounting configuration is shown. In order to prevent the weight 9 and the viscous damping liquid 6 in the vibration damping device 4 from being affected when a lightning strike occurs, the cylindrical portion of the storage container 5 is a steel pipe, and the top plates at the upper and lower portions thereof. 10 and the bottom plate 11 are preferably steel plates.

  5B and 7, supported portions 13 having female screw holes are provided on the outer peripheral surface of the storage container 5 at equal angular intervals in the circumferential direction, and bolts are supported on the outer peripheral surface of the upper steel pipe constituting the pole 1. A mode is shown in which the vibration control device 4 is installed at a predetermined position by bolts 14 that are provided at equal angular intervals in the circumferential direction and are inserted into the bolt support holes and screwed into the supported portions 13. ing.

  In the vibration damping device 4 as described above, the natural frequencies of the first and second compression coil springs 7 and 8 and the weight 9 of the vibration damping device 4 are preferably matched with the natural frequency of the pole 1.

  In this way, when the pole 1 starts to swing at the natural frequency due to resonance due to the wind, the weight 9 in the vibration control device swings in the opposite phase, creating a force that suppresses the movement of the pole 1, and the vibration of the pole 1 For example, the amplitude at the time of resonance can be suppressed to about 1/10 as compared with the case where there is no vibration damping device. The damping coefficient ratio is determined by the viscosity and amount of the viscous damping liquid 6 and the mass of the weight 9. Therefore, if the damping coefficient ratio is set so that a desired damping ratio can be obtained with respect to the vibration received by the pole 1 by changing them. Good. The illustrated vibration damping device 4 may be arranged sideways (where the lid is on the upper side), or other known vibration damping devices may be used.

(Function)
As described above, in the present invention, since the string material as a branch line is installed with an initial introduction tension between the anchor installed on the ground and the bundle material, the upward deformation of the bundle material is suppressed, and the bundle material By suppressing the upward deformation of the pole, a bending moment that resists the deformation of the pole due to the wind is generated at the joint of the pole, and as a result, the restraining effect of suppressing the deformation when the pole is subjected to the wind is exhibited. And has high wind resistance.
In addition, since the string material as the branch line is installed almost vertically between the free end of the bundle and the anchor installed on the ground, it is possible to prevent deflection due to the weight of the branch line of the prior art and to reduce the opening of the branch line. Therefore, the installation area can be reduced.
Since the bundling material is fixed to the pole, and the string material is simply installed between the end of the bundling material and the anchor installed on the ground, it becomes a low-cost support structure for the pole.
Since the initial introduction tension of the string material installed in each section between bundles installed in multiple stages in the vertical direction of the pole is controlled to increase from the top to the bottom, the effect of suppressing the deformation of the pole increases. The initial introduction tension applied to the string material installed between the lowermost bundle member and the anchor installed on the ground does not become excessive.
In addition, since at least one vibration damping device is provided on the top of the pole to suppress resonance, the amplitude at the time of resonance of the pole can be significantly reduced even if the height of the pole is increased. Therefore, deformation of the pole top can be suppressed to a small extent.

(A) (b) The perspective view and top view which show the support structure of the pole of this invention (A) (b) The figure which shows the effect | action of the support structure of the pole of this invention Diagram showing conventional pole support structure Explanatory drawing showing the relationship between pole height and top deformation (A) And (b) is a perspective view which shows the pole which attached the damping device Longitudinal front view showing a form in which a damping device is attached to the upper end of the pole Longitudinal front view showing a form in which a damping device is installed inside the pole

Explanation of symbols

1: Pole 2: Bundle material 3: String material 4: Damping device 5: Storage container 6: Viscous damping liquid 7: First compression spring 8: Weight 9: Weight 10: Top plate 11: Bottom plate 12: Bolt / nut 13: Covered Supporting part 14: Bolt 15: Top plate 16: Bolt and nut

Claims (4)

In the support structure of the pole, a bundle member extending in an appropriate length horizontally in the lateral direction around the pole is fixed to the outer periphery of the pole, and the bundle member is arranged in a plurality of stages at predetermined intervals in the vertical direction of the pole. Installed, installed a string material with initial introduction tension between the upper end of the pole, the free end of the bundle material of multiple stages, and the anchor provided on the ground, and installed in multiple stages in the vertical direction of the pole A pole support structure characterized in that the initial introduction tension of the string material installed in each section between the bundle members is controlled so as to increase from the upper side to the lower side . In a support structure for a pole for lighting, an aircraft obstacle light, an antenna, an emergency broadcast facility, and a transmission line, a bundle member extending in an appropriate length horizontally in the horizontal direction around the pole is attached to the pole. The string member is fixed to the outer periphery, the bundle member is installed in a plurality of stages at predetermined intervals in the vertical direction of the pole, and the string member is between the upper end of the pole, the free end of the bundle member of the plurality of stages, and the anchor provided on the ground The initial introduction tension of the string material installed in each section between the bundle members installed in a plurality of stages in the vertical direction of the pole is controlled so as to increase from the upper side to the lower side. pole supporting structure, characterized in that is. The pole support structure according to claim 1 or 2, wherein a bundle member extending in an appropriate length horizontally in the lateral direction with the pole as a center extends radially in at least three directions. The pole support structure according to any one of claims 1 to 3, wherein at least one vibration damping device is provided on an upper portion of the pole to suppress resonance.

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