Earthquake-resistant reinforcement structure for utility poles, and earthquake-resistant reinforcement method for utility poles

Abstract

To realize an earthquake-resistant reinforcement structure for utility poles and an earthquake-resistant reinforcement method for utility poles, in which earthquake-resistant strength against shaking in a railroad direction can be increased by using an overhead wire which is an existing facility.SOLUTION: In order to seismically reinforce multiple utility poles 10 to which an overhead wire 1 along a railroad direction is bridged, earthquake-resistant strength against shaking in a direction perpendicular to a railroad is increased by connecting upper portions of a pair of utility poles 10 across the railroad with a connecting member 30 so as to be formed in a gate shape, and earthquake-resistance strength against shaking in the railroad direction is increased by rigidly connecting the existing overhead wire 1 along the railroad direction to the multiple utility poles 10. In particular, by providing branch lines 20 for giving a support force along the railroad direction to a pair of utility poles 10 arranged to sandwich at least one utility pole 10, the natural vibration of the multiple utility poles 10 aligned along the railroad direction can be reduced in a range between the pair of utility poles 10 to which the branch lines 20 are provided, and the earthquake-resistance strength against shaking in the railroad direction can be increased.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a structure for seismic reinforcement of a utility pole and a method for seismic reinforcement of a utility pole. [Background technology]

[0002] Conventionally, a technique has been known for seismic reinforcement of utility poles erected alongside tracks, in which a displacement suppression member is wound around the utility pole from its top end downward to restrain displacement of each part of the pole (see, for example, Patent Document 1). Furthermore, a technique is known for seismically reinforcing a pair of utility poles erected on either side of a track by providing a first displacement limiting member along each utility pole and providing a second displacement limiting member spanning the top of one utility pole and the top of the other utility pole in a direction perpendicular to the tracks (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-117088 A [Patent Document 2] JP 2015-042817 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the earthquake-resistant reinforcement in Patent Document 2 mentioned above, by connecting the upper parts of a pair of utility poles with a second displacement-limiting material to form a gate shape, it is possible to increase the earthquake resistance against shaking perpendicular to the tracks, but no measures are taken against shaking in the direction of the tracks.

[0005] An object of the present invention is to provide an earthquake-resistant reinforcement structure for an electric pole and an earthquake-resistant reinforcement method for an electric pole that can increase earthquake resistance against shaking in the line direction by utilizing existing overhead electric wires. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the present invention is to A seismic reinforcement structure for a utility pole for reinforcing the seismic resistance of a plurality of utility poles arranged in a rail line direction and having overhead electric wires extending along the rail line direction, the overhead electric conductor is rigidly coupled to the upper portion of the plurality of electric poles; A pair of utility poles arranged to sandwich at least one utility pole are provided with guy wires that are stretched obliquely from the top of each utility pole to the rail base and provide support along the rail direction.

[0007] In a seismic reinforcement structure for utility poles having such a configuration, the overhead electric wires aligned along the track direction are rigidly connected to the tops of multiple utility poles, thereby increasing the seismic strength against vibrations in the track direction. In particular, by providing a support wire for providing a supporting force along the track direction to a pair of utility poles arranged to sandwich at least one utility pole, the natural vibration of the multiple utility poles aligned along the track direction can be reduced in the range between the pair of utility poles to which the support wire is provided, thereby increasing the seismic strength against vibrations in the track direction. With this type of earthquake-resistant reinforcement structure for utility poles, the overhead electric wires, which are existing equipment, can be used to effectively increase the earthquake resistance strength of multiple utility poles lined up along the line direction against shaking in the line direction.

[0008] Also preferably, The plurality of utility poles are arranged on both sides of the railroad tracks, A connecting member is provided on the pair of utility poles sandwiching the rail line to connect the upper portions of the utility poles.

[0009] By connecting the tops of a pair of utility poles on either side of the tracks with connecting members to form a gate shape, it is possible to increase earthquake resistance against shaking perpendicular to the tracks.

[0010] Also preferably, The plurality of utility poles are a row of utility poles arranged on an elevated bridge.

[0011] When the above-mentioned earthquake-resistant reinforcement structure for utility poles is applied to multiple utility poles (a row of utility poles) arranged in a row on a viaduct, resonance between the multiple utility poles lined up in the direction of the tracks and the viaduct can be suppressed in the area between a pair of utility poles equipped with support wires, thereby effectively increasing the earthquake resistance of the multiple utility poles arranged on the viaduct.

[0012] Also preferably, The overhead electric wire is rigidly connected in a state of line contact with a support fitting that is fixed to the top of the electric pole and extends along the line direction.

[0013] This allows the overhead conductor to be suitably and rigidly connected to the top of the utility pole.

[0014] Also preferably, The support bracket is fixed to the upper part of the utility pole via a band member attached to the outer circumferential surface of the utility pole, The fastening portion of the band member is located on the outer peripheral surface of the utility pole at a point on a line passing through the axis of the utility pole and parallel to the line direction.

[0015] By fixing the fastening parts of the band members in this arrangement, it is possible to suppress displacement of the fastener due to the load from the overhead electric wire, and it is possible to suitably and rigidly connect the overhead electric wire to the upper part of the utility pole.

[0016] In addition, another invention related to this application is A method for seismic reinforcement of utility poles for reinforcing the seismic resistance of a plurality of utility poles arranged in a rail line direction and having overhead electric wires suspended along the rail line direction, comprising the steps of: A utility pole selection process for selecting one or more utility poles to be reinforced from among the plurality of utility poles; A support wire installation process is a process of installing support wires that are diagonally stretched from the top of each utility pole to the rail base on a pair of utility poles that are arranged to sandwich at least one or more utility poles selected as reinforcement targets, and that provide support along the rail direction. a wire fixing step of rigidly connecting the overhead electric wire to at least the pair of electric poles and an upper portion of an electric pole between the pair of electric poles; The above configuration is adopted.

[0017] With this type of earthquake-resistance reinforcement method for utility poles, the overhead wires aligned along the track direction are rigidly connected to the tops of multiple utility poles, thereby increasing the earthquake resistance against shaking in the track direction, and by providing a support wire to a pair of utility poles that are positioned on either side of a selected utility pole, the natural vibration of multiple utility poles lined up along the track direction can be reduced in the area between the pair of utility poles with the support wires, thereby increasing the earthquake resistance against shaking in the track direction. With this method of earthquake-resistance reinforcement of utility poles, the overhead electric wires, which are existing equipment, can be used to effectively increase the earthquake resistance against shaking in the line direction of multiple utility poles lined up along the line direction.

[0018] Also preferably, The plurality of utility poles are arranged on both sides of the railroad tracks, The method includes a step of providing a connecting member for connecting the upper portions of the pair of utility poles sandwiching the line therebetween.

[0019] By connecting the tops of a pair of utility poles on either side of the tracks with connecting members to form a gate shape, it is possible to increase earthquake resistance against shaking perpendicular to the tracks.

[0020] Also preferably, The plurality of utility poles are arranged on an elevated bridge, The number of utility poles between the pair of utility poles is determined so that the natural period of vibration of the utility pole selected as the reinforcement target in the track direction is shorter than the natural period of vibration of the viaduct in the track direction.

[0021] This makes it possible to effectively suppress resonance between the viaduct and the multiple utility poles (pole rows) arranged in a row on the viaduct, thereby effectively increasing the earthquake resistance of the multiple utility poles arranged on the viaduct.

[0022] Also preferably, When the plurality of utility poles are a mixture of concrete poles and steel pipe poles, the utility poles are selected in the utility pole selection step by giving priority to the range in which the concrete poles are continuous.

[0023] This makes it possible to selectively reinforce the area where concrete poles, which have lower strength than steel pipe poles, are connected, and more effectively increase the seismic strength of multiple utility poles. Effect of the Invention

[0024] According to the present invention, by utilizing the overhead electric wire, which is an existing facility, it is possible to increase the earthquake resistance against shaking in the line direction. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a perspective view showing an example of a seismic reinforcement structure for a utility pole according to an embodiment of the present invention. [Diagram 2] FIG. 2(a) is an enlarged view showing the main parts of the earthquake-resistant reinforcement structure of a utility pole, and FIG. 2(b) is an explanatory diagram of the fasteners (support brackets and band members) used to secure the overhead electric wires to the utility pole. [Diagram 3] FIG. 1 is a perspective view showing an example of a seismic reinforcement structure for a utility pole in which a utility pole on an elevated bridge is seismically reinforced. [Figure 4] 13(a) and (b) are explanatory diagrams regarding the number of utility poles sandwiched between a pair of utility poles with guy wires and the consideration of their natural periods. [Diagram 5] FIG. 13 is a diagram showing the correlation between the number of utility poles sandwiched between a pair of utility poles provided with guy wires and their natural periods. [Figure 6] FIG. 1 is an explanatory diagram that examines the natural period when a concrete pole and a steel pipe pole are mixed among utility poles sandwiched between a pair of utility poles provided with guy wires. [Figure 7] FIG. 13 is a diagram showing values ​​of the natural period when a concrete pole and a steel pipe pole are mixed among utility poles sandwiched between a pair of utility poles provided with guy wires. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, the embodiments of the earthquake-resistant reinforcement structure and the earthquake-resistant reinforcement method for a utility pole according to the present invention will be described in detail with reference to the drawings. However, the embodiments described below are subject to various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

[0027] The earthquake-resistant reinforcement structure 100 for a utility pole in this embodiment is intended to provide earthquake-resistant reinforcement for a plurality of utility poles 10 arranged in the direction of the railway line and having overhead electric wires 1 suspended along the direction of the railway line. Before the earthquake-resistant reinforcement structure is constructed, the overhead electric wires 1 that are stretched across the multiple electric poles 10 are suspended and supported by, for example, suspension fittings.

[0028] 1 and 2, the earthquake-resistant reinforcement structure 100 for a utility pole of this embodiment has a plurality of utility poles 10 erected on the upper surface of a railroad track base B and arranged in the railroad track direction, and an overhead electric wire 1 that is stretched across the plurality of utility poles 10 and rigidly connected to the upper part of each utility pole 10, and a pair of utility poles 10 arranged to sandwich at least one utility pole 10 are provided with guy wires 20 that are stretched obliquely from the upper part of the pair of utility poles 10 to the railroad track base B and provide a supporting force along the railroad track direction. Here, the pair of guy wires 20 are provided at positions that sandwich the utility pole 10 along the railroad track direction. The track base B is a roadbed or the like that is provided under the track on which the railroad tracks (not shown) are laid, and is the part that is piled up with soil and concrete. For example, if the span length of multiple utility poles 10 arranged in the track direction is 50 m, the support wire 20 that is stretched diagonally from the top of the utility pole 10 to the track base B is installed at a position 20 m from the base of the utility pole 10.

[0029] In the earthquake-resistant reinforcement structure 100 for a utility pole of this embodiment, the multiple utility poles 10 are arranged on both sides of the railroad tracks (not shown). That is, the multiple utility poles 10 are arranged in two rows, one on each side of the railroad tracks (not shown). A connecting member 30 is provided on each pair of utility poles 10 that are arranged with a railroad track (not shown) therebetween, connecting the upper portions of the utility poles 10 together. The connecting member 30 is a so-called beam, and is disposed along a direction perpendicular to the track. In this embodiment, a steel pipe beam is used as an example of the connecting member 30, but the type of beam is arbitrary, and it may be a truss beam or the like.

[0030] In addition, in the earthquake-resistant reinforcement structure 100 for a utility pole of this embodiment, the overhead electric wire 1 is fixed to the upper part of the utility pole 10 using a fixing device 40 having a support bracket 41 and a band member 42, as shown in Figures 2(a) and (b). The support bracket 41 is fixed to a band member 42 via, for example, an insulator, and the support bracket 41 is fixed to the upper part of the utility pole 10 via the band member 42 which is fastened to the outer peripheral surface of the utility pole 10 . In particular, the support bracket 41 is fixed to the utility pole 10 in a direction parallel to the rail line direction. The overhead electric wire 1 is rigidly connected in line contact with a support fitting 41 fixed to the upper part of the electric pole 10. Specifically, with the overhead electric wire 1 in line contact with the upper surface of the support bracket 41, the overhead electric wire 1 is sandwiched between the support bracket 41 and the U-shaped member 41a, and a nut member 41b screwed onto the end of the U-shaped member 41a on the underside of the support bracket 41 is tightened, thereby rigidly connecting the overhead electric wire 1 to the support bracket 41. In other words, the overhead electric wire 1 is rigidly connected in a line contact state to the support bracket 41 of the fixing device 40, and the overhead electric wire 1 is rigidly connected to the upper part of the utility pole 10 via the fixing device 40. Here, an L-shaped angle material (an angle iron) is used as the support metal fitting 41, but other metal fittings or members may be used as the support metal fitting 41.

[0031] Moreover, the band member 42 that fixes the support bracket 41 to the upper part of the utility pole 10 is, for example, a member formed by fastening two bands having a substantially C-shape with a fastening member 42b. The fastening member 42b has a bolt and a nut, and is attached to the fastening portion 42a for fastening the band member 42 to the utility pole 10. The band member 42 is fixed to the utility pole 10 so that the fastening portion 42a of the band member 42 is located on a line on the outer circumferential surface of the utility pole 10 that passes through the axis of the utility pole 10 and is parallel to the direction of the railway line. By fixing the fastening portion 42a of the band member 42 in this arrangement, displacement of the fastener 40 due to the load from the overhead electric wire 1 can be suppressed.

[0032] With such an earthquake-resistant reinforcement structure 100 for a utility pole, the upper parts of a pair of utility poles 10 that are arranged on either side of the rail tracks are connected with connecting members 30 to form a gate shape, thereby increasing earthquake resistance against shaking perpendicular to the rail tracks, and by rigidly connecting the overhead electric wires 1 that run along the rail tracks to multiple utility poles 10, earthquake resistance against shaking in the rail tracks direction can be increased. In particular, by providing a pair of utility poles 10 arranged on either side of at least one utility pole 10 with a support wire 20 for providing support along the track direction, the natural vibration of multiple utility poles 10 lined up along the track direction can be reduced in the area between the pair of utility poles 10 to which the support wire 20 is provided, and the earthquake resistance against shaking in the track direction can be increased. In this way, the earthquake-resistant reinforcement structure 100 for a utility pole of this embodiment can increase the earthquake resistance strength against shaking in the track direction of multiple utility poles 10 lined up along the track direction by utilizing the overhead electric wire 1, which is an existing facility.

[0033] 3, when the earthquake-resistant reinforcement structure 100 for a utility pole of this embodiment is applied to a plurality of utility poles 10 arranged and installed on a viaduct K, resonance between the plurality of utility poles 10 lined up along the track direction and the viaduct K can be suppressed in the range between a pair of utility poles 10 to which the support wires 20 are provided, so that the earthquake resistance strength of the plurality of utility poles 10 can be effectively increased. Here, the roadbed of the viaduct K corresponds to the track base B. Specifically, as described later in relation to the method for seismic reinforcement of utility poles, the number of utility poles 10 between a pair of utility poles 10 is determined so that the natural period of the vibration in the track direction of the multiple utility poles 10 (utility pole row) to be reinforced is shorter than the natural period of the vibration in the track direction of the viaduct K, and the utility pole seismic reinforcement structure 100 is constructed. In addition, the number of utility poles 10 between a pair of utility poles 10 may be determined so that the natural period of the vibration of the viaduct K in the track direction does not coincide with the natural period of the vibration of the multiple utility poles 10 (pole row) to be reinforced in the track direction, and the earthquake-resistant reinforcement structure 100 for the utility poles may be constructed. In this way, resonance between the viaduct K and the multiple utility poles 10 arranged on the viaduct K can be suitably suppressed, and the earthquake resistance of the multiple utility poles 10 arranged on the viaduct K can be effectively increased.

[0034] In addition, in the above embodiment, as shown in Figures 1 and 3, an earthquake-resistant reinforcement structure 100 for a utility pole is described as an example in which a pair of utility poles 10 are arranged to sandwich one utility pole 10 therebetween and a support wire 20 is provided to provide supporting force along the track direction to the pair of utility poles 10, but there may be two or more utility poles 10 sandwiched between the pair of utility poles 10 having the support wire 20. In other words, the earthquake-resistant reinforcement structure 100 for a utility pole in this embodiment can be constructed by rigidly connecting overhead electric wires 1 to the tops of all utility poles 10 arranged in the area to be reinforced, arranging connecting members 30 to connect the tops of pairs of utility poles 10 across a rail line (not shown), and installing guy wires 20 at every predetermined number of utility poles 10 (for example, every other utility pole, every third utility pole, every third utility pole, etc.). Of course, the earthquake-resistant reinforcement structure 100 for a utility pole may be constructed so that there are a mixture of locations where a branch wire 20 is installed every other utility pole, locations where a branch wire 20 is installed every third utility pole, locations where a branch wire 20 is installed every third utility pole, and locations where a branch wire 20 is installed every third utility pole.

[0035] In addition, in the earthquake-resistant reinforcement structure 100 for a utility pole shown in Fig. 1, one utility pole 10 is sandwiched between a pair of utility poles 10 provided with guy wires 20, and three utility poles 10 are arranged along the track direction. In this way, when there are three utility poles 10 arranged along the track direction, the number of spaces (spans) between the three utility poles 10 (number of spans) is two.

[0036] Here, the results of the inventors' investigation into the number of utility poles 10 sandwiched between a pair of utility poles 10 on which the support wires 20 are provided will be described.

[0037] In this embodiment, as shown in Fig. 4(a), a state in which 21 utility poles 10 are arranged in a range of 1000 m along the track direction, with the utility poles 10 arranged every 50 m, and the overhead electric wires 1 are rigidly connected to the utility poles 10, is used as a reference. In this state in which 21 utility poles 10 are arranged, the number of spans, which is the number of spaces between the utility poles 10, is 20. Then, under the condition where no supporting wires 20 are installed, the natural periods of each of the following utility pole rows were obtained by simulation: a utility pole row where 21 utility poles 10 are arranged with 20 spans, a utility pole row where 11 utility poles 10 are arranged with 10 spans, a utility pole row where 5 utility poles 10 are arranged with 4 spans, and a utility pole row where 3 utility poles 10 are arranged with 2 spans.As a result, as shown in Figure 5, the natural period of each utility pole row along the track direction was approximately 0.375 [s].

[0038] In contrast, when the natural period of each utility pole row along the track direction was obtained by simulation under the condition that the poles 10 on both sides of the utility pole row were provided with guy wires 20 as shown in FIG. 4(b), as shown in FIG. 5, the natural period of the utility pole row when 21 utility poles 10 are arranged and the number of spans is 20 is 0.37 [s], when 13 utility poles 10 are arranged and the number of spans is 12 is 0.36 [s], and when 11 utility poles 10 are arranged and the number of spans is 1 is 0. The natural period of the utility pole row when the distance between the utility poles 10 and the poles is 0 is 0.35 [s], when nine utility poles 10 are arranged and the number of spans is 8, the natural period of the utility pole row when seven utility poles 10 are arranged and the number of spans is 6, the natural period of the utility pole row when five utility poles 10 are arranged and the number of spans is 4, and the natural period of the utility pole row when three utility poles 10 are arranged and the number of spans is 2 is 0.22 [s].

[0039] Thus, it was found that in the case of a utility pole row without guy wires 20, the natural period of each utility pole row does not change and is roughly the same value even if the number of utility poles 10 is reduced and the number of spans is reduced, whereas in the case of a utility pole row with guy wires 20 installed on the utility poles 10 on both sides, the natural period of the utility pole row becomes shorter (the value of the natural period of the utility pole row becomes smaller) as the number of utility poles 10 is reduced and the number of spans is reduced. Specifically, it was found that in a pole row in which guy wires 20 are installed on the poles 10 on both sides of the pole row along the track direction, if the number of spans is less than 20 (i.e., 19 or less), more preferably 10 or less, then the natural period will be shorter than that of a pole row without guy wires 20. From the results of this analysis (see FIG. 5), it is preferable that the number of spans between a pair of utility poles 10 on which guy wires 20 are installed be 19 or less, and more preferably 10 or less. Therefore, a pole earthquake-resistant reinforcement structure 100 is constructed by installing guy wires 20 on utility poles 10 on both sides of a row of utility poles so that the number of spans is as described above. This makes it possible to increase the earthquake resistance strength of the multiple utility poles 10 arranged in the rail line direction against shaking in the rail line direction.

[0040] Here, the results of the inventors' investigation into the case where the utility poles 10 sandwiched between a pair of utility poles 10 having a support wire 20 are a mixture of concrete poles and steel pipe poles will be described.

[0041] As shown in Fig. 6, in a pole row in which 21 poles 10 are arranged at intervals of 50 m over a range of 1000 m along the track direction, overhead electric wires 1 are rigidly connected to each pole 10, and guy wires 20 are installed on the poles 10 on both sides of the pole row. In the figure, the poles 10 drawn with relatively thin lines are concrete poles, and the poles 10 drawn with relatively thick lines are steel pipe poles. In the case where concrete poles and steel pipe poles are mixed in such a pole row, the natural period of the pole row along the track direction was obtained by simulation.

[0042] As shown in Figure 7, the natural period of the utility pole row when there were zero steel pipe poles among the 21 utility poles 10 (all concrete poles) was 0.37 [s], the natural period of the utility pole row when there were three steel pipe poles among the 21 utility poles 10 was 0.36 [s], the natural period of the utility pole row when there were five steel pipe poles among the 21 utility poles 10 was 0.36 [s], the natural period of the utility pole row when there were eight steel pipe poles among the 21 utility poles 10 was 0.35 [s], the natural period of the utility pole row when there were 11 steel pipe poles among the 21 utility poles 10 was 0.33 [s], and the natural period of the utility pole row when there were 21 steel pipe poles among the 21 utility poles 10 (all steel pipe poles) was 0.26 [s].

[0043] In this way, it was found that the more steel pipe poles included in the 21 utility poles 10 constituting the utility pole row, the shorter the natural period of the utility pole row becomes (the smaller the value of the natural period of the utility pole row becomes). The analysis result (see Figure 7) that the more steel pipe poles, which are stronger than concrete poles, there are, the shorter the natural period of the utility pole row will be was expected, and no unexpected results were confirmed due to the mixture of concrete poles and steel pipe poles. Therefore, it was determined that even if the multiple utility poles 10 that make up the utility pole row are a mixture of concrete poles and steel pipe poles, the utility pole earthquake-resistant reinforcement structure 100 of this embodiment can increase the earthquake resistance strength of multiple utility poles 10 arranged in the track direction against shaking in the track direction.

[0044] Next, the method for seismic reinforcement of a utility pole according to this embodiment will be described. Here, we will explain an example of the procedure for constructing the above-mentioned earthquake-resistant reinforcement structure 100 for a utility pole, which is a procedure for earthquake-resistant reinforcement of multiple utility poles 10 that are arranged in the direction of the railway line and have overhead wires 1 suspended along the direction of the railway line.

[0045] First, one or more utility poles 10 to be reinforced are selected from among the multiple utility poles 10 (utility pole selection step). For example, an old utility pole 10 may be selected so as to select a utility pole 10 that is likely to require reinforcement in terms of its service life, or a utility pole 10 that shows signs of having been exposed to wind and rain for a long period of time may be selected so as to select a utility pole 10 that is likely to have deteriorated.

[0046] Next, a pair of utility poles 10 are arranged to sandwich at least one or more utility poles 10 selected as reinforcement targets, and a guy wire 20 is installed so as to be stretched diagonally from the top of each utility pole 10 to the track base B to provide supporting force along the track direction (guy installation process). In the earthquake-resistant reinforcement structure 100 for a utility pole shown in FIG. 1, one utility pole 10 is selected as the target for reinforcement, and guy wires 20 are installed on both sides of the utility pole 10. In addition, when a utility pole 10 in one row on either side of a railroad track (not shown) is determined to be a target for reinforcement, the paired utility pole 10 on either side of the railroad track (not shown) is also considered to be a target for reinforcement.

[0047] Next, the overhead electric wire 1 is rigidly connected to a pair of electric poles 10 arranged to sandwich the electric pole 10 selected as the reinforcement target and to the top of the electric pole 10 between the pair of electric poles 10 (electric wire fixing process). For example, the overhead electric wire 1 that is suspended across a plurality of utility poles 10 using hanging fittings is removed from the hanging fittings, and the overhead electric wire 1 is rigidly connected to the top of the utility poles 10 using the above-mentioned fastener 40.

[0048] Next, a connecting member 30 that connects the upper portions of the utility poles 10 that form a pair with a railroad track (not shown) therebetween is disposed (connecting member installation step).

[0049] By this procedure, an earthquake-resistant reinforcement structure 100 for a utility pole can be constructed. In this method for earthquake-resistant reinforcement of utility poles, the first step is the utility pole selection step, but the order of the guy wire installation step, the electric wire fixing step, and the connecting member installation step is arbitrary, and these three steps can be appropriately performed as the second to fourth steps to create the earthquake-resistant reinforcement structure 100 for the utility pole.

[0050] Next, a method for strengthening the earthquake resistance of utility poles based on the analysis results of the above-mentioned simulation will be described.

[0051] For example, when performing earthquake-resistance reinforcement on multiple utility poles 10 arranged on viaduct K (see Figure 3), the number of utility poles 10 between a pair of utility poles 10 is determined so that the natural period of vibration in the track direction of the utility pole 10 selected as the target for reinforcement is shorter than the natural period of vibration in the track direction of the viaduct K. In this way, resonance between the viaduct K and the multiple utility poles 10 arranged on the viaduct K can be suitably suppressed, and the earthquake resistance of the multiple utility poles 10 arranged on the viaduct K can be effectively increased.

[0052] Furthermore, when the multiple utility poles 10 are a mixture of concrete poles and steel pipe poles, the utility poles 10 to be reinforced are selected in the utility pole selection process by giving priority to the range where the concrete poles are continuous. In this way, it is possible to selectively reinforce the area where the concrete poles, which have a lower strength than the steel pipe poles, are continuous, and it is possible to more suitably increase the earthquake resistance strength of the multiple utility poles 10.

[0053] As described above, with the earthquake-resistant reinforcement structure 100 for a utility pole of this embodiment and the earthquake-resistant reinforcement method for a utility pole for constructing this earthquake-resistant reinforcement structure, the upper parts of the utility poles 10 that are paired on either side of the rail tracks are connected with connecting member 30 to form a gate shape, thereby increasing the earthquake resistance against shaking perpendicular to the rail tracks, and the overhead electric wires 1 that run along the rail track direction are rigidly connected to multiple utility poles 10, thereby increasing the earthquake resistance against shaking in the rail track direction. In addition, by providing guy wires 20 to a pair of utility poles 10 that are positioned on either side of the utility pole 10 to be reinforced, the natural vibration of the multiple utility poles 10 lined up along the rail track direction can be reduced, thereby increasing the earthquake resistance of the multiple utility poles 10. In this manner, the electric pole earthquake-resistant reinforcement structure 100 of this embodiment and the electric pole earthquake-resistant reinforcement method for constructing the earthquake-resistant reinforcement structure can, by utilizing the overhead electric wire 1, which is an existing facility, suitably increase the earthquake resistance strength against shaking in the track direction of multiple electric poles 10 lined up along the track direction.

[0054] In the above embodiment, the overhead electric conductor 1 is rigidly connected to the upper part of the utility pole 10 using a fastener 40 having a support bracket 41 and a band member 42, but the present invention is not limited to this, and the overhead electric conductor 1 may be rigidly connected to the upper part of the utility pole 10 using other brackets or members.

[0055] In addition, other specific details of the structure can of course be modified as appropriate. [Explanation of symbols]

[0056] 1 Overhead power line 10. Electric pole 20 branch lines 30 Connecting members 40 Fixtures 41 Support bracket 41a U-shaped member 41b Nut member 42 Band material 42a Binding part 42b Fastening members 100 Earthquake-resistant reinforcement structure for utility poles K viaduct B. Track base

Claims

1. A seismic reinforcement structure for a utility pole for reinforcing the seismic resistance of a plurality of utility poles arranged in a rail line direction and having overhead electric wires extending along the rail line direction, the overhead electric conductor is rigidly coupled to the upper portion of the plurality of electric poles; A pair of utility poles arranged on either side of at least one utility pole are provided with guy wires that are stretched diagonally from the top of each utility pole to the rail base and provide support along the rail direction.

2. The plurality of utility poles are arranged on both sides of the railroad tracks, 2. The earthquake-resistant reinforcement structure for a utility pole according to claim 1, wherein a connecting member is provided for connecting the upper portions of the utility poles that form a pair on either side of the rail line.

3. 3. The earthquake-resistant reinforcement structure for utility poles according to claim 1, wherein the plurality of utility poles are arranged on an elevated bridge.

4. The earthquake-resistant reinforcement structure for a utility pole according to claim 1 or 2, characterized in that the overhead electric wire is rigidly connected in a line contact state to a support bracket fixed to the upper part of the utility pole along the line direction.

5. The support bracket is fixed to the upper part of the utility pole via a band member attached to the outer circumferential surface of the utility pole, 5. The earthquake-resistant reinforcement structure for a utility pole according to claim 4, characterized in that the fastening portion of the band member is located on the outer peripheral surface of the utility pole at a location on a line passing through the axis of the utility pole and parallel to the line direction.

6. A method for seismic reinforcement of utility poles for reinforcing the seismic resistance of a plurality of utility poles arranged in a rail line direction and having overhead electric wires suspended along the rail line direction, comprising the steps of: A utility pole selection process for selecting one or more utility poles to be reinforced from among the plurality of utility poles; A support wire installation process for providing support wires that are diagonally stretched from the top of each of a pair of utility poles that are arranged to sandwich at least one or more utility poles selected as reinforcement targets to the rail base and that provide support force along the rail direction; a wire fixing step of rigidly connecting the overhead electric wire to at least the pair of electric poles and an upper portion of an electric pole between the pair of electric poles; A method for earthquake-proof reinforcement of a utility pole, comprising:

7. The plurality of utility poles are arranged on both sides of the railroad tracks, The method for earthquake-proof reinforcement of utility poles according to claim 6, further comprising the step of providing a connecting member for connecting the upper portions of the utility poles that form a pair on either side of the rail line.

8. The plurality of utility poles are arranged on an elevated bridge, The method for seismic reinforcement of utility poles according to claim 6 or 7, characterized in that the number of utility poles between the pair of utility poles is determined so that the natural period of the vibration of the utility pole selected as the reinforcement target in the track direction is shorter than the natural period of the vibration of the viaduct in the track direction.

9. The method for seismic reinforcement of utility poles according to claim 6 or 7, characterized in that when the plurality of utility poles include a mixture of concrete poles and steel pipe poles, priority is given to an area in which concrete poles are continuous in the utility pole selection step to select utility poles.

Images