JP2021000932A - Reinforcement device for gate-shape pole and train lane switching method - Google Patents

Abstract

To provide a reinforcement device for a gate-shaped pole that can reduce bending moment applied to the vicinity of a root of an electric pole.SOLUTION: The reinforcement device for a gate-shaped pole 10 comprises two electric poles 11A and 11B erected at left and right sides of a railway track, and a beam 12 laid across an upper part of one electric pole of the two electric poles and an upper part of the other electric pole. Among an intermediate part of the one electric pole, an intermediate part of the other electric pole, and the beam, are provided a pair of reinforcement steel materials 21A and 21B that are arranged in oblique directions respectively and vary a stiffness ratio between the electric poles and the beam so that ratio increases. The pair of reinforcement steel materials have lower ends connected to the corresponding electric poles below an intermediate point in a height direction of the electric poles, and are arranged to be set at inclination angles at which construction limit is not hindered. Further, strut materials 22A and 22B arranged in a horizontal direction are provided between a part for jointing a lower horizontal steel material 12b constituting a truss beam to oblique steel materials 12d and 12e at both left and right sides and the electric poles, respectively.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gate-type column reinforcing device for supporting train lines such as electric wires, overhead lines, and trolley lines, and a method for switching train lines.

Rigid frame consisting of two utility poles erected on the left and right sides of the track and a beam laid horizontally between the upper parts of the utility poles as a train line support structure that supports overhead power lines such as electric wires, overhead lines, and trolley lines. There is a gate-shaped pole with a structure. There are concrete columns, steel pipe columns, square steel pipe columns, etc. for utility poles of gate-shaped columns, and truss-type beams, steel pipe beams, etc. for beams.
In the past, the mainstream of overhead wire equipment for train tracks in the Tokyo metropolitan area was compound overhead wires (5 electric wires) and twin simple overhead wires (6 electric wires), but these facilities have a large number of parts. In addition to the large number, there was a problem that the position of the wire was high and maintenance and inspection were difficult. Therefore, at the same time as the switching time of the aging equipment, for example, construction work is being carried out to switch to a slim integrated overhead wire (three electric wires) with the same function but a smaller number of parts of the constituent equipment. ..

By the way, the gate-shaped column for the integrated overhead wire is composed of a concrete column and a steel pipe beam. On the other hand, the gate-shaped columns for compound overhead lines and twin simple overhead lines use truss-type beams. Therefore, when switching to the integrated overhead line, it is necessary to change the gate type pillar.
On the other hand, since railways are an important infrastructure for society, it is necessary to proceed with the switching work to integrated overhead lines without stopping the commercial operation of trains. Therefore, when switching from compound overhead lines or twin simple overhead lines to integrated overhead lines, the present inventors first first parallel the existing feeder lines, suspension lines and trolley wires to the feeder suspension lines and trolley wires for the integrated overhead lines. We considered a method of arranging the gate-type pillars equipped with the existing truss-type beam and then switching the gate-type pillars to those for the integrated overhead line in order.

However, when the above-mentioned method of construction is carried out, the load on the existing gantry column is temporarily increased by installing the feeder suspension wire for the integrated overhead wire, so that the existing gantry column is used. It became clear that some of them could not maintain the prescribed yield strength. Specifically, the existing gantry poles often lack the proof stress against the bending moment applied to the root of the utility pole near the foundation.

Then, if there is even one gate-shaped pillar having insufficient proof stress as described above in a section of a predetermined distance (for example, 1600 m) set to apply a predetermined amount of tension to the train line, the said The erection work of the train line cannot proceed until all the new train line support structures are completed in the section. However, it was found that by reinforcing the gate-shaped columns, the erection work of the train line can proceed without waiting for the completion of the new train line support structure.
Conventionally, as for the reinforcement technique for the gantry pole, an invention has been proposed in which a damper is arranged diagonally between the utility pole and the beam in order to suppress the shaking of the utility pole in the event of an earthquake. Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-39873

However, the load applied to the gantry column includes not only the shaking during an earthquake but also the load due to the wind. In the method for reinforcing the portal pole of Patent Document 1 described above, the energy due to the reciprocating swing at the time of an earthquake can be absorbed by the expansion and contraction of the damper provided between the utility pole and the beam. However, since the load due to the wind continues to act in one direction for a long time and the damper does not expand or contract, there is a problem that the stress due to the bending moment applied to the root of the utility pole cannot be reduced by the damper.

Therefore, the present inventors have studied the reinforcing structure of the gantry column. As a result, since the existing gantry pole has a margin in the allowable bending moment of the beam, the bending moment applied to the root of the utility pole is applied by arranging a reinforcing steel material diagonally between the utility pole and the beam. It was found that the stress due to the above can be reduced so as not to exceed the allowable proof stress.
However, it was found that if the steel material in the diagonal direction was simply added, the bending moment applied to the beam would increase and deformation might occur especially in the part of the beam near the utility pole.

The present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is to provide a gate-shaped pole reinforcing device capable of reducing the bending moment applied to the root of an existing utility pole.
Another object of the present invention is to provide a reinforcing steel material to reduce the bending moment applied to the root of the existing utility pole so that the beam can be prevented from being deformed even if the bending moment applied to the beam is increased. The purpose is to provide a reinforcement device for portal poles.
Still another object of the present invention is to provide a train line switching method capable of shortening the period until the overhead line switching and proceeding with the train line switching work without interrupting the normal commercial operation of the train.

In order to solve the above problems, the gantry column reinforcing device according to the present invention is used.
A gate-shaped structure equipped with two utility poles erected on the left and right sides of a railroad track and a beam laid horizontally between the upper part of one of the two utility poles and the upper part of the other utility pole. It is a pillar reinforcement device
A pair of reinforcing steel materials are provided diagonally between the intermediate portion of the one utility pole and the intermediate portion of the other utility pole and the beam, respectively, and the rigidity ratio of the utility pole and the beam is changed so as to be large.
The lower end of the pair of reinforcing steel materials is connected to the corresponding utility pole at or below the midpoint in the height direction of the utility pole, and is arranged at an inclination angle so as not to interfere with the construction limit. It was configured to be installed. This is because when reinforcing the existing gantry column, there is a risk of collision with the train, depending on the mounting position of the reinforcing steel material, which may hinder the building limit. Here, the building limit refers to a space range in which the installation of obstacles or structures on tracks and railways is not permitted.

According to the gantry pole reinforcing device having the above configuration, the bending moment applied to the root of the utility pole can be reduced by changing the rigidity ratio of the utility pole and the beam, thereby reducing the bending moment applied to the root of the utility pole. It is possible to reduce the stress due to the bending moment applied so that the allowable stress is not exceeded. It also allows the task of switching train lines before replacing all gantry columns with new ones.

Here, preferably, the beam is a V-shaped truss beam.
The pair of reinforcing steel materials includes an intermediate portion of the one utility pole, an intermediate portion of the other utility pole, and a first node or a portion outside the left and right side portions of the upper horizontal steel material constituting the truss beam. Two of each should be arranged between them.

According to the above configuration, the reinforcing steel material can make it difficult to interfere with the construction limit, and the part where the beam is deformed is limited to the outside of the first node on the left and right sides of the horizontal steel material above the beam. It is possible to easily design and study for reinforcement.

Further, preferably, it is arranged in the horizontal direction between the joint portion of the lower horizontal steel material constituting the truss beam with the oblique steel material on both the left and right sides and the one utility pole and the other utility pole. Provide a pair of bracing members.
According to such a configuration, the tensioning material can counteract the bending moment, thereby preventing the beam from being deformed.

Further, preferably, the end portion of the pair of tension members on the utility pole side is connected to the utility pole by a utility pole connecting metal fitting having a band wound around the utility pole.
At the end of the pair of tension members on the side of the joint, a U-shaped cross section that can contact both sides of a plate constituting a joint fitting that connects the end of the lower horizontal steel and the diagonal steel. A fitting portion is provided so that the fitting portion is fitted to the plate so as to be relatively movable.
According to such a configuration, since the tension member can be connected to the truss beam without any processing on the member on the column side including the fitting, the strength of the existing column is not reduced and the tension is maintained. The material connection work can be completed in a short time.

In addition, other inventions of this application
In a train line switching method for switching a feeder, an overhead wire, and a trolley wire suspended by a gantry column equipped with a truss beam to a feeder suspension wire and a trolley wire.
Of the existing gate-shaped poles, the predetermined size that acts on the root of the utility pole when the feeder wire, suspension wire, and trolley wire before switching and the feeder suspension wire and trolley wire after switching are hung down. Steps to extract the ones that lack the resistance to the bending moment of
A pair that changes the rigidity ratio between the utility pole and the beam between the middle part of one utility pole and the middle part of the other utility pole and the beam, which lacks the bearing capacity for bending of a predetermined size. Steps to arrange the reinforcing steel materials diagonally at an inclination angle that does not interfere with the construction limits,
A step of disposing a pair of tension members in the horizontal direction between the joints of the lower horizontal steel material constituting the truss beam with the diagonal steel materials on the left and right sides and the one utility pole and the other utility pole. When,
A step of hanging a new feeder suspension line and trolley wire on the existing gantry column while leaving the feeder wire, suspension wire and trolley wire before switching.
A step of installing a new gantry column and transferring the new electric suspension line and trolley wire to the new gantry column,
A step of removing the existing gantry column and the wire, overhead wire, and trolley wire before switching is included.
According to this method, the train line can be switched before replacing all the gantry columns with new ones, so that the period until the overhead line switching can be shortened and the normal commercial operation of the train can be interrupted. It will be possible to proceed with the train line switching work without any problems.

According to the gate-shaped pole reinforcing device according to the present invention, the bending moment applied to the root of the existing utility pole can be reduced, and the bending moment applied to the root of the existing utility pole can be reduced by providing the reinforcing steel material. Even if the bending moment applied to the beam increases, the effect that the beam can be prevented from being deformed can be obtained.
Further, according to the train line switching method according to the present invention, it is possible to shorten the construction period and proceed with the train line switching work without interrupting the normal commercial operation of the train.

It is a front view which shows one Embodiment of the reinforcement device of the gate type column which concerns on this invention. It shows the magnitude of the bending moment when the gantry column receives the force P due to the crosswind and the load W due to the weight of the pem, (A) is the bending moment diagram before reinforcement, and (B) is the bending after reinforcement. It is a moment diagram. (A) is a diagram showing a configuration example of a connection fitting for connecting the reinforcing steel material to the utility pole, and (B) is a diagram showing a configuration example of the connection fitting for connecting the reinforcing steel material to the truss beam. (A) is a front view showing a configuration example of the tension member, (B) is a front view showing a configuration example of a connection fitting for connecting the tension member to the truss beam, and (C) is a plan view thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, a gate-shaped column reinforcing device as a train line support structure according to an embodiment of the present invention will be described with reference to FIG. The existing gate-type pillars include 1-line straddle, 2-line straddle, 3-line straddle, 4-line straddle, etc., but in FIG. 1, it is applied to the most typical 2-line straddle gate-type pillar. An example is shown.
In addition, the gate-shaped poles include a basic gate-shaped pole structure (one layer, one span) consisting of two utility poles and one beam as shown in FIG. 1, and three utility poles. There are a gantry pole consisting of one beam (one layer and two spans) and a gantry pole consisting of four utility poles and one beam (one layer and three spans). Reinforcing devices can also be applied to these other forms of portal poles.

The portal pole 10 shown in FIG. 1 includes two utility poles 11A and 11B, a truss beam 12 horizontally supported by the utility poles 11A and 11B, a lower bundle 13 hanging from the center of the truss beam 12, and a lower bundle. It is composed of a movable bracket 16 fixed to the 13 or the utility pole 11A (or 11B) and supporting the suspension wire 14 and the trolley wire 15. The truss beam 12 shown in FIG. 1 is a V-shaped truss beam when viewed from the side. Further, reference numeral 17 is attached to the utility pole foundation, reference numeral 18 is attached to the insulator for insulation, and reference numeral CL is attached to the line indicating the building limit.

The V truss beam 12 includes two upper horizontal steel materials (upper chord material) 12a and one lower horizontal steel material (lower chord material) 12b, and is provided in a vertical direction between the upper horizontal steel material 12a and the lower horizontal steel material 12b. A truss structure is formed by disposing a bundle member 12c in a diagonal direction.
In addition, the gate-shaped pillars of compound overhead lines and twin simple overhead lines have a structure called a yagura for suspending electric wires on the truss beam, and armed wires attached to the upper part of the electric poles. However, in FIG. 1, the structure for suspending the wire is not shown.

In the portal pole of the present embodiment, a metal pipe such as stainless steel or aluminum is used between the substantially intermediate height positions of the utility poles 11A and 11B and the first node of the upper horizontal steel material 12a constituting the truss beam 12. Reinforcing steel materials 21A and 21B made of (pipe) are provided. Although it is not clear from FIG. 1, two reinforcing steel materials 21A and 21B are provided in the front and rear, the lower end is connected to the utility pole by a utility pole metal fitting and a utility pole band, and the upper end is connected to a truss beam by a beam metal fitting and a triangular bolt. It is connected. The utility pole metal fittings and the beam metal fittings are each formed by combining channel steel having a U-shaped cross section.
Here, the first node of the upper horizontal steel material 12a means the outermost node in the left-right direction among the nodes to which the ends of the bundle members 12c constituting the V truss beam are connected. Therefore, there are four first nodes at the same height position on the gantry column of the V truss beam.

As for the bonding height position of the reinforcing steel materials 21A and 21B with respect to the utility poles 11A and 11B, the bending moment acting on the utility pole root can be reduced as the position is lower, but if the bonding position is lowered too much, the construction limit is hindered. It ends up. Therefore, in the gantry column of the present embodiment, for example, the lower ends of the reinforcing steel materials 21A and 21B are connected to the position 4 m below the upper horizontal steel material 12a of the beam.
Both ends of the upper horizontal steel material 12a constituting the V truss beam 12 are fixed at a position of, for example, 1 m from above the utility poles 11A and 11B. Therefore, the lower end coupling position (height) of the reinforcing steel materials 21A and 21B is a position (height) that is approximately half of the upper end coupling height of the V truss beam 12.

Further, in the portal pole of the present embodiment, a metal pipe such as aluminum or the like is used between the utility poles 11A and 11B and the joint fittings 12f at both ends of the lower horizontal steel material 12b constituting the V truss beam 12. Reinforcing bracing members 22A and 22B made of (pipe) are provided so as to form a substantially horizontal posture. The tension members 22A and 22B are one on each side. The joint fittings 12f at both ends of the lower horizontal steel material 12b are joined to the end portions of the diagonal steel material 12d upward and the inclined steel material 12e downward. The other end of the slanted steel material 12d is connected to the end portion of the upper horizontal steel material 12a, and the other end of the slanted steel material 12e is connected to the utility pole by a connecting metal fitting (not shown).
Both ends of the lower horizontal steel material 12b constituting the V truss beam 12 are located directly below the first node of the upper horizontal steel material 12a in FIG. 1, and the lengths of the tension members 22A and 22B are the utility poles 11A or It is designed to be approximately the same length as the distance between 11B and the first node.

In the gantry pole, the bending moment is shared not only at the base of the utility pole but also by the gantry structure including the beam, so the load bearing capacity is improved compared to the single column. Since this sharing ratio is determined by the rigidity ratio of the utility pole and the beam, the bending moment applied to the base of the utility pole changes by changing the moment of inertia of area of the beam. FIG. 2A shows the magnitude of the bending moment when a lateral load P of a predetermined size and a vertical load W due to the weight of the beam are applied to the gantry column having the steel pipe beam. FIG. 2B shows the magnitude of the bending moment of the gantry pole when the rigidity ratio between the utility pole and the beam is increased by providing a reinforcing material or the like. Comparing (A) and (B) in FIG. 2, it can be seen that the stress due to the bending moment at the base of the utility pole can be reduced by increasing the rigidity ratio between the utility pole and the beam.

On the other hand, some of the existing gantry poles have insufficient proof stress against the bending moment applied to the root of the utility pole near the foundation.
Based on the above findings, the portal pole of the present embodiment increases the rigidity ratio between the utility pole and the beam by providing reinforcing steel materials 21A and 21B between the utility poles 11A and 11B and the V truss beam 12. By doing so, the bending moment applied to the root of the utility pole does not exceed the allowable stress.

However, if the reinforcing steel materials 21A and 21B are simply added between the utility poles 11A and 11B and the V truss beam 12, the bending moment applied to the truss beam 12 increases and the portion of the truss beam 12 particularly close to the utility pole is deformed. There was a risk of doing it. Therefore, the gantry pole of the present embodiment is a strut member for reinforcement between the utility poles 11A and 11B and the coupling fittings 12f at both ends of the lower horizontal steel material 12b constituting the V truss beam 12 as described above. 22A and 22B are provided.

Of these, the right strut member 22B resists the V-truss beam 12 from being deformed when the wind from the left acts on the gate-shaped column, and the left strut members 22A and 22B are right on the gate-shaped column. It has a function of resisting the deformation of the V-truss beam 12 when a wind from the direction acts. That is, the tension members 22A and 22B need only withstand the force in the compressive direction, and do not have to function so as to withstand the force in the extending direction.
Therefore, the tension members 22A and 22B are arranged between the utility poles 11A and 11B and the V truss beam 12 by a structure (FIG. 4) as described below.

Next, a configuration example of a connection fitting for connecting the reinforcing steel materials 21A and 21B to the utility poles 11A and 11B and a beam fitting for connecting the reinforcing steel materials 21A and 21B to the V truss beam 12 will be described with reference to FIG.
As shown in FIG. 3A, the utility pole metal fittings 30 for connecting the lower ends of the reinforcing steel materials 21A and 21B to the utility poles 11A and 11B are two channel steel materials 31A and 31B in the direction parallel to the train line. A rectangular frame 31 formed by joining the ends of two channel steels 31C and 31D in the direction perpendicular to the train line by welding or bolts, and a utility pole connected to the center of the channel steels 31C and 31D. It is composed of a band 32. The utility pole band 32 has a configuration similar to that provided for removing a movable bracket or the like in many existing utility poles, and the utility pole metal fitting 30 is fixed to the utility pole by the utility pole band 32.

Further, the frame body 32 is provided with auxiliary steel materials 33A and 33B arranged in parallel with the channel steel materials 31C and 31D at predetermined intervals. Then, the lower end of one of the pair of reinforcing steel materials 21A (or 21B) between the steel materials 31C and 33A, and the other of the reinforcing steel materials 21A (or 21B) between the steel materials 31D and 33B. The lower end of each steel material is inserted. Then, the lower end portion of the reinforcing steel material 21A (or 21B) is connected to the frame body 31 by the bolt 34A penetrating the steel materials 31C and 33A and by the bolt 34B penetrating the steel materials 31D and 33B, and is integrated with the frame body 31. It is fixed to the utility pole 11A (or 11B) by the utility pole band 32.

As shown in FIG. 3B, the beam metal fittings 40 for connecting the upper ends of the reinforcing steel materials 21A and 21B to the V-tras beam 12 include two channel steel materials 41A and 41B in the direction parallel to the train line. By two channel steel materials 41C, 41D and channel steel materials 41C, 41D in the direction parallel to the beam 12, and a rectangular frame 42 composed of auxiliary steel materials 43A, 43B arranged in parallel at a predetermined interval. It is configured. Then, the channel steel materials 41A and 41B are coupled to each of the two upper chord members 12a of the V truss beam 12 by triangular bolts.

Further, the upper end portion of one of the pair of reinforcing steel materials 21A (or 21B) between the steel materials 41C and 43A, and the upper end portion of the other steel material of the reinforcing steel material 21A between the steel materials 41D and 43B. Are inserted respectively. Then, the upper end of the reinforcing steel material 21A (or 21B) is connected to the frame body 42 by the bolt 44A penetrating the steel materials 41C and 43A and by the bolt 44B penetrating the steel materials 41D and 43B, and the frame body 42 is a triangular bolt. The upper end of the reinforcing steel material 21A (or 21B) is fixed to the V-truss beam 12 by being coupled to the two upper chord members 12a of the V-truss beam 12 at four points.

Next, a configuration example of a connection fitting for connecting the tension members 22A and 22B to the utility poles 11A and 11B and a beam metal fitting for connecting the tension members 22A and 22B to the V truss beam 12 will be described with reference to FIG.
As shown in FIG. 4A, the connection fitting 50 for connecting the tension member 22A (22B) to the utility pole 11A (11B) has a utility pole having the same configuration as that provided for removing the movable bracket or the like. It consists of a band 51 and a fitting 52 integrally provided on the utility pole band 51, and the end of the tension member 22A (or 22B) is joined to the fitting 52 by a bolt 53 or the like to connect the utility pole 11A (11B). ) Is fixed.

As shown in FIGS. 4B and 4C, the beam fitting 60 for connecting the end portion of the tension member 22A (22B) to the V truss beam 12 is bolted to the end portion of the tension member 22A (or 22B). A coupling portion 60A coupled by 61 and a fitting portion 60B having the same spacing as the thickness of the coupling metal fitting 12f on the V truss beam 12 side are provided.
With the above configuration, the fitting portion 60B of the beam metal fitting 60 can move relative to the coupling metal fitting 12f, and the tension members 22A and 22B do not contribute much to the tension and are exclusively for compression. It will work as a member to oppose it.

As shown by the broken line, a protruding portion 60C that protrudes to the outside of the coupling metal fitting 12f may be provided in a part of the fitting portion 60B, and the bolt 62 may be inserted through the protruding portion 60C. With this configuration, by providing the protruding portion 60C and the bolt 62, when the V truss beam 12 is significantly deformed without any processing on the beam side coupling fitting 12f, it is coupled to the fitting portion 60B. It is possible to prevent the ends of the tension members 22A and 22B from falling off from the V truss beam 12 due to the fitting with the metal fitting 12f being disengaged. If the length of the fitting portion is designed to be sufficiently large, even if the fitting portion 60B is simply loosely fitted to the coupling metal fitting 12f without providing the protruding portion and the bolt 62, the fitting portion may fall off. Can be avoided.

Next, regarding the procedure of the method of switching the train line using the reinforcement device of the gate type pillar of the above embodiment, from the compound overhead line or the twin simple overhead line provided with the feeder line, the suspension wire and the trolley wire, the feeder suspension wire and the trolley Switching to an integrated overhead wire equipped with a wire will be described as an example.
When switching train lines, first of all, when the feeder line, suspension line and trolley wire before switching and the feeder suspension line and trolley wire after switching are hung down from the existing gate-shaped poles, the utility pole Those having insufficient proof stress against a bending moment of a predetermined size acting on the root are extracted (step 1). The yield strength of existing utility poles can be known by checking the equipment management information of the equipment management system and the display of local utility poles. If there is no equipment management information, etc., a strain gauge is attached at a predetermined position near the base of the utility pole to apply a lateral load of a predetermined size to the upper part of the utility pole, and the value (strain amount) of the strain gauge at that time is calculated. It may be read and calculated using a calculation formula.

Next, the rigidity ratio of the utility pole and the beam is set between the intermediate portion of one utility pole 11A and the intermediate portion of the other utility pole 11B and the beam 12, which lacks the bearing capacity for a bending moment of a predetermined size. A pair of reinforcing steel materials 21A and 21B, which are changed so as to be large, are arranged diagonally at an inclination angle so as not to interfere with the construction limit (step 2).
Subsequently, a pair of horizontal steel members forming the truss beam are formed between the left and right side joints (joining metal fittings 12f) of the diagonal steel materials and the one utility pole and the other utility pole, respectively. The tension members 22A and 22B are arranged (step 3).

Next, a new feeder suspension wire and trolley wire are hung on the existing gantry column while leaving the feeder wire, suspension wire and trolley wire before switching (step 4). As a result, the switching of the train line is completed, and the train operation by the integrated overhead line can be started. Next, a new gate-shaped pillar for the integrated overhead wire is installed, and the feeder suspension wire and trolley wire temporarily suspended from the existing gate-shaped pillar are transferred to the new gate-shaped pillar (step). 5). After that, the existing gantry column, the wire before switching, the overhead wire, and the trolley wire are removed (step 6) to complete a series of construction work. Alternatively, if it is confirmed that the bending moment generated at the root of the utility pole in the load after switching to the integrated overhead wire is less than the allowable stress of the existing utility pole, these devices can be removed.

In addition, according to the train line switching method according to the above procedure, the train line can be switched before replacing all the gantry columns with new ones (for integrated overhead lines), so the period until the overhead line switching It is possible to shorten the time and to proceed with the train line switching work without interrupting the normal commercial operation of the train. By shortening the period until the overhead line is switched, the inspection work of the electric wire located higher than the beam is eliminated after the switching, and the maintenance and inspection work of the train line can be facilitated at an early stage.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above embodiment, the case where the present invention is applied to a gantry column provided with a V-truss beam has been described, but the present invention is not limited thereto, and includes other forms of beams such as a flat truss beam. It can also be applied to gate-shaped pillars.
Further, in the above embodiment, the switching from the compound overhead wire or the twin simple overhead wire to the integrated overhead wire has been described as an example, but the present invention can also be used for switching other types of overhead wires.

10 Gate type pole 11A, 11B Electric pole 12 V truss beam 12a Upper chord material (upper horizontal steel material)
12b Lower chord material (lower horizontal steel material)
12c Bundle material 12d, 12e Oblique steel material 13 Lower bundle 14 Suspended wire 15 Tram wire 16 Movable bracket 17 Utility pole foundation 21A, 21B Reinforcing steel material 22A, 22B Strut material CL Building limit

Claims (5)

A gate-shaped structure equipped with two utility poles erected on the left and right sides of a railroad track and a beam laid horizontally between the upper part of one of the two utility poles and the upper part of the other utility pole. It is a pillar reinforcement device
A pair of reinforcing steel materials are provided diagonally between the intermediate portion of the one utility pole and the intermediate portion of the other utility pole and the beam, respectively, and the rigidity ratio of the utility pole and the beam is changed so as to be large.
The lower end of the pair of reinforcing steel materials is connected to the corresponding utility pole at or below the midpoint in the height direction of the utility pole, and is arranged at an inclination angle so as not to interfere with the construction limit. A gate-shaped pole reinforcement device that is characterized by being installed. The beam is a V-shaped truss beam.
The pair of reinforcing steel materials includes an intermediate portion of the one utility pole, an intermediate portion of the other utility pole, and a first node or a portion outside the left and right side portions of the upper horizontal steel material constituting the truss beam. The reinforcement device for a portal pole according to claim 1, wherein two of each are arranged between them. A pair of strut members arranged in the horizontal direction between the joints of the lower horizontal steel material constituting the truss beam with the diagonal steel materials on the left and right sides and the one utility pole and the other utility pole. The reinforcement device for a gate-shaped pole according to claim 2, further comprising. The end portion of the pair of tension members on the utility pole side is connected to the utility pole by a utility pole connecting metal fitting having a band wound around the utility pole.
At the end of the pair of tension members on the side of the joint, a U-shaped cross section that can contact both sides of a plate constituting a joint fitting that connects the end of the lower horizontal steel and the diagonal steel. The gate-shaped column reinforcing device according to claim 3, wherein a fitting portion is provided, and the fitting portion is fitted to the plate so as to be relatively movable. This is a train line switching method for switching the feeder, overhead wire, and trolley wire suspended by a gate-shaped pillar equipped with a truss beam to the feeder suspension wire and trolley wire.
Of the existing gate-shaped poles, the predetermined size that acts on the root of the utility pole when the feeder wire, suspension wire, and trolley wire before switching and the feeder suspension wire and trolley wire after switching are hung down. Steps to extract the ones that lack the resistance to the bending moment of
A pair that changes the rigidity ratio between the utility pole and the beam between the middle part of one utility pole and the middle part of the other utility pole and the beam, which lacks the bearing capacity for bending of a predetermined size. Steps to arrange the reinforcing steel materials diagonally at an inclination angle that does not interfere with the construction limits,
A step of disposing a pair of tension members in the horizontal direction between the joints of the lower horizontal steel material constituting the truss beam with the diagonal steel materials on the left and right sides and the one utility pole and the other utility pole. When,
A step of hanging a new feeder suspension line and trolley wire on the existing gantry column while leaving the feeder wire, suspension wire and trolley wire before switching.
A step of installing a new gantry column and transferring the new electric suspension line and trolley wire to the new gantry column,
A step of removing the existing gantry column and the electric wire, overhead wire, and trolley wire before switching,
A train line switching method characterized by including.

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