JP5356288B2 - Temporary structure and construction method for overhead power transmission lines - Google Patents

Description

  The present invention provides a temporary installation of an overhead power transmission line for temporarily replacing an existing overhead power transmission line at the time of replacement work of an overhead power transmission line wired through a steel tower, or rebuilding or new construction of an existing steel tower. It relates to the structure and temporary construction method.

  As shown in FIG. 16, a general overhead power transmission line 100 is supported through a plurality of steel towers 101 installed on the ground, and connects between substations 102 (or a power plant, a power supply destination, etc.). Wired. When such an aerial power transmission line 104 (configured by the aerial power transmission line 100 and the steel tower 101) has deteriorated, the overhead power transmission line 104 is remodeled.

As shown in FIG. 17, the overhead power transmission line 100 is replaced and / or the existing steel tower 101 is reconstructed or newly constructed. As shown in FIG. 17, a temporary steel tower 101a is newly built next to the existing steel tower 101, that is, at another site outside the existing site. Then, the temporary overhead power transmission line 100a is stretched on the temporary tower 101a, and the temporary overhead power transmission line 103 (temporary route) is secured. By securing the temporary route 103, the power supply is stopped to a minimum.
Thereafter, the existing overhead power transmission line 100 and / or the existing steel tower 101 are removed, and a new steel tower and overhead power transmission line are constructed on the same site.

  On the other hand, in an area where urbanization has progressed, it may be difficult to secure a site for rebuilding the steel tower 101a described above. For this purpose, an FJ (Faraway Jumper) method has been developed (see, for example, Patent Document 1). In this FJ method, a temporary iron pillar or a concrete pillar is constructed in the vicinity of one predetermined existing tower without constructing the above-described overhead tower 101a, and a jumper line connecting existing overhead power transmission lines is installed. It is performed by drawing around to this temporary iron pillar or concrete pillar. As a result, the distance between the jumper wire, which is a bare wire, and the steel tower is sufficiently separated, and the work space for replacing the overhead power transmission line in the steel tower portion and safety are ensured. This FJ method can be constructed if a site for constructing iron pillars or concrete pillars and a site necessary for the routing of jumper wires can be secured. Therefore, it is necessary to secure a large site like the construction method shown in FIG. Excellent in that there is no.

Japanese Patent Laid-Open No. 11-18225

  However, in the above-mentioned FJ method, work is done by routing jumper wires in one steel tower, so it is difficult to rebuild the existing steel tower itself even though the old overhead power transmission line can be replaced. there were. For this reason, a wrapping method that constructs a new steel tower while wrapping the existing steel tower in a set with the FJ method has also been developed, but the work space is limited, so the workability is poor and a tower rebuilding schedule is required for a long time. turn into. Moreover, when it is going to rebuild each of several steel towers, since it is necessary to perform FJ construction method and a wrapping construction method as a set about each steel tower, construction cost will become high.

  Furthermore, even if only the FJ method is used, the site area to be secured is small compared with the method shown in FIG. 17, but it is necessary for the site for constructing the iron pillar or the concrete pillar and the routing of the jumper wire. The site must be secured, and it may be difficult to secure the site area in urbanized land.

  The present invention has been made in view of the above-described circumstances, and it is possible to reduce the site area required for the reconstruction of an existing overhead power transmission line and to perform a rebuilding of a steel tower in a short period of time compared to the conventional one. It is for providing the temporary structure and temporary construction method of a power transmission line.

In order to solve the above-mentioned problems, the present invention is a temporary structure of an overhead power transmission line for constructing a temporary power transmission line that replaces an existing power transmission line installed on the upper part of a steel tower, Instead of the above, the present invention is characterized in that an insulating power cable for transmitting electric power is installed between pillar members arranged at intervals in the site of an existing overhead transmission line.

  In the power cable, the conductor is formed of aluminum or an aluminum alloy.

  Furthermore, the said pillar member can also be installed in the side groove | channel or side wall of the existing railway road line or a highway.

Further, a vertical power cable having an insulating property that is branched from the existing overhead power transmission line and is routed downward along the main body of the tower , the power in the site of the tower or the ground power transmission line. You may connect with a cable.

  Furthermore, a brace extending in the wiring direction of the overhead power transmission line from the steel tower is provided, and the vertical bus connected in a manner branched from the overhead power transmission line while being wired downward from the arm metal, You may connect with the said power cable in the site or the site of an overhead power transmission line.

  Furthermore, the arm metal may be provided with a polymer insulator for supporting the upper end portion of the vertical bus bar and insulating the vertical bus bar from the arm metal.

On the other hand, a temporary method of overhead power transmission lines in place of the existing overhead power transmission line, a power cable having an insulating property for transmitting power instead of the existing overhead lines, on the site of existing overhead power transmission line It is constructed between pillar members arranged at intervals.

  Moreover, it is the said construction method, Comprising: The said column member can also be installed in the side groove | channel or side wall of the existing railway road site or a highway.

  Further, in the above construction method, a vertical power cable having an insulating property that is branched from the overhead power transmission line installed on the upper part of an existing tower and is routed downward along the tower body, You may connect with the said power cable in the site or the site of an overhead power transmission line.

  Furthermore, in the above construction method, the vertical bus connected in a manner branched downward from the overhead power transmission line while being wired downward from the armature extending from the tower to the wiring direction of the overhead power transmission line, You may connect with the said power cable in the site of a steel tower, or the site of an overhead power transmission line.

The temporary structure and temporary method of overhead transmission lines according to the present invention, a power cable having an insulating property for transmitting power instead of the existing overhead lines, spaced on the grounds of existing overhead power transmission line Since it is erected between the arranged column members, it is possible to reduce the necessity of securing a new site for constructing the column members and the like when securing a temporary overhead power transmission line. Therefore, land costs, material costs, and construction costs can be reduced compared with the conventional method.
In addition, since a temporary overhead transmission line can be secured, not only the removal of the existing overhead transmission line but also the reconstruction and new construction of the steel tower can be performed efficiently and safely. Therefore, compared with the conventional construction method, these remodeling and reconstruction works can be performed in a short period of time.

It is a top view which shows the whole outline | summary of the temporary structure of the overhead power transmission line which concerns on embodiment of this invention. It is a front view of the pillar which is supporting the temporary power cable. It is a front view of other embodiment of the pillar which is supporting the temporary power cable. It is a front view of other embodiment of the pillar which is supporting the temporary power cable. It is sectional drawing of an electric power cable, Comprising: (A) is what uses the aluminum core wire, (B) combines three cables into one. It is the front view which looked at the existing steel tower shown in FIG. 1 from the direction orthogonal to the wiring direction of an overhead power transmission line, Comprising: It is a figure which shows the state which led the electric power cable branched from the jumper line to the steel tower lower side. It is a front view which expands and shows the part which a power cable branches from a jumper wire in the upper phase armor part vicinity of FIG. It is a side view of the steel tower shown in FIG. FIG. 7 is another example of FIG. 6, and is a front view of a steel tower viewed from a direction perpendicular to the wiring direction of the overhead power transmission line. It is a side view of the steel tower shown in FIG. It is an enlarged view of the connection part of the arm bracket and power cable of the steel tower upper part shown in FIG. FIG. 7 is still another example of FIG. 6, and is a front view of a steel tower viewed from a direction perpendicular to the wiring direction of the overhead power transmission line. It is a side view of the steel tower shown in FIG. It is a schematic diagram which shows the fixing method of the power cable in a ground mount. It is a schematic diagram which shows the state which connected the power cable shown in FIG. 14 on a ground mount. It is the top view which looked at the existing overhead power transmission line from the upper side. It is a top view which shows the state which replaced the existing overhead power transmission line with the new steel tower.

  Hereinafter, a temporary structure and a temporary construction method for an overhead power transmission line according to an embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, a structure for transmitting three-phase alternating current will be described as an example.

  The temporary structure 1 of the overhead power transmission line in the present embodiment is configured by wiring a temporary power cable 10 as an alternative to the existing power transmission line 7 constituted by the existing power transmission line 2 shown in FIG. This is a structure for constructing the electric circuit 8. By adopting this structure, the existing overhead transmission line 7 is removed and replaced while the power is supplied through the temporary transmission line 8 as before, and the existing steel tower is removed and reconstructed (or newly constructed). Can do.

  The existing overhead power transmission line 2 is wired by being supported by a plurality of steel towers 4 between substations 3 (or power plants, power supply destinations, etc.) located at both ends of FIG. Note that the existing overhead power transmission line 7 in this embodiment transmits power of 66 KV or more.

  The temporary power cable 10 is constructed by a plurality of column members 11 arranged on both sides of the steel tower 4 (upper side and lower side of the paper sandwiching the steel tower 4 in FIG. 1). A plurality of the pillar members 11 are built at intervals along the existing overhead power transmission line 7 in the existing site necessary for constructing the existing steel tower 4 and the existing overhead power transmission line 2. In addition, by installing the column member 11 on a structure part in the site of an existing railway line, or installing it in a gutter or a side wall of an expressway, a temporary power transmission path 8 is secured without securing a new site. Can also be configured.

  As shown in FIG. 2, the column member 11 is a concrete column made of concrete or the like, and is formed lower than the height of the steel tower 4 (see FIG. 5). That is, by making the height of the wiring path of the power cable 10 lower than the wiring height of the existing overhead power transmission line 2, a work space for removing and replacing the existing overhead power transmission line 2 is provided above the column member 11. Secured.

  The column member 11 is composed of a concrete column main body portion 12 extending vertically and a cable support portion 13 provided on the upper portion of the column main body portion 12 for supporting the wired power cable 10 on the upper side. Yes. Since the overhead power transmission line 2 generally transmits three-phase alternating current, three power cables 10 (indicated by reference numerals 10a, 10b, and 10c in FIG. 2) are also wired.

  3 and 4 show another embodiment of the column member 11. The column member 21 shown in FIG. 3 includes two concrete column main body portions 22 and a cable support portion 23 for supporting the power cable 10 on the upper side. This column member 21 is configured by improving the load resistance in the downward direction by considering the weight of the power cable 10 and the like by configuring the number of the column main body portions 22 as two. Moreover, the distance between the support points of the power cable 10 can be increased by increasing the support load.

  On the other hand, the pillar member 31 shown in FIG. 4 is comprised by the pillar main-body part 32 comprised with the steel tower which has a truss structure, and the cable support part 33 for supporting the electric power cable 10 on the upper side. Since this column member 31 is an assembled truss structure steel tower, the workability at the time of installation and removal is good, and it is effective for shortening the construction period.

  The power cables 10 (10a, 10b, 10c) described above are insulated cables whose outer sides are covered with an insulating coating (for example, a cross-linked polyethylene vinyl sheath) as shown in FIG. Is used. The outer periphery of the core wire 14 is covered with an insulator 15, and the outer periphery thereof is covered with a shielding copper tape 16.

  In an ordinary power cable, copper is used for the core wire in order to improve conductivity, but the power cable 10 in this embodiment uses aluminum or an aluminum alloy in order to reduce the weight of the power cable 10. That is, the power cable 10 is heavier than the overhead wire that is a bare electric wire by the amount covered with the insulating coating. Therefore, the power cable 10 is reduced in weight in order to reduce the load acting on the column member 11 (21, 31) in the power transmission path or to increase the distance between the support points of the column member 11.

Here, the characteristics of an overhead power transmission line (ACSR 410 mm ² × 2 conductor) that is generally used are a current capacity 1116 (A) and a mass 3346 (kg / km). The power cable that is an alternative to the above-described overhead transmission line is preferably selected from an insulated cable having a current capacity equivalent to that of the overhead transmission line.
When a power cable having a current capacity equivalent to this electric wire is selected, when the core wire is a copper conductor, the cross-sectional area is 1000 mm ² , the current capacity is 1120 (A), and the mass is 19800 (kg / km).
On the other hand, the aluminum conductor has a cross-sectional area of 1600 mm ² , a current capacity of 1170 (A), and a mass of 17000 (kg / km).
That is, comparing the case of the copper conductor and the case of the aluminum conductor, it can be seen that the aluminum conductor is lighter.

  Also, sag (refers to sagging of the transmission line, and generally referred to as “sag” in power transmission) is the difference in height between the wire support point and the lowest point of the curve formed by the wire. In the case of height, the slackness is the difference in height at the midpoint), and the slack tension of the overhead power transmission line is 30m across the span and the slackness is 1.5m. The worst-case tension in the case of a copper conductor is 1920 kgf, and the worst-case tension in the case of an aluminum conductor is 1810 kgf. That is, the power cable of the aluminum conductor can be reduced by about 14% of the tension compared to the case of the copper conductor, and the strength of the column members 11 (21, 31) can be reduced, or between the column members 11 It is possible to increase the distance.

The load conditions in the calculation of the sag tension described above are a temperature of 15 ° C. and a wind pressure of 100 kgf / m ² in the high temperature season, and a temperature of 15 ° C., a wind pressure of 50 kgf / m ² and a thickness of icing snow of 6 mm (specific gravity) in the low temperature season. 0.9).

  On the other hand, as shown in FIG. 5 (B), a triplex-type power cable 18 in which the three power cables 10 (10a, 10b, 10c) of FIG. An example of this use state is shown in FIG.

FIG. 6 is a front view of the steel tower 4 shown in FIG. 1 viewed from a direction perpendicular to the wiring direction of the overhead power transmission line 2. 7 is an enlarged view showing a branching portion of the power cable of FIG. 6, and FIG. 8 is a side view of FIG.
The overhead power transmission line 2 (indicated by reference numerals 2a, 2b, and 2c from above) is composed of three braces 4a, 4b, and 4c (see FIG. 8) extending from the steel tower 4 in a direction substantially perpendicular to the existing overhead power transmission line 7. It is supported at the front end portion via an insulator 5. Also, the left and right overhead power transmission lines 2 (2a, 2b, 2c) shown in FIG. 6 are electrically connected by a jumper wire 6 which is a bare wire, and the jumper wire 6 connects one overhead power transmission line to the other. Electric power is transmitted to the overhead transmission line.

  As shown in FIGS. 6 to 8, polymer insulators 41 are respectively suspended at the respective distal end portions of the arm metals 4a, 4b, and 4c. A branch sleeve 42 is attached to the lower side of the polymer insulator 41. The polymer insulator 41 is used to insulate the arm metal 4a, 4b, 4c and the branch sleeve 42 from each other.

  As shown in FIG. 7, the branch sleeve 42 has a substantially T shape, and the jumper wire 6 is inserted through an insertion hole (not shown) formed in the upper horizontal portion. Further, the upper end of the vertical power cable 40 (40a, 40b, 40c) corresponding to each phase is attached to the lower vertical portion of the substantially T shape. As a result, the electric power sent through the jumper wire 6 is sent to the vertical power cable 40 via the branch sleeve 42.

At the upper end of the vertical power cable 40 (40a, 40b, 40c), a connection terminal (not shown) fixed by a fastening member such as a bolt and an insulating member covering the outside of the connection terminal are provided. ing. The insulating member is coated so as to insulate the connecting portion after the connection terminal and the connecting portion of the branch sleeve 42 are connected.

  The vertical power cables 40 (40a, 40b, 40c) are wired up and down along the steel tower 4. The lower end portion of the vertical power cable 40 (40a, 40b, 40c) is connected to the power cable 10 (10a, 10b, 10c) on the ground mount 44 provided in the site of the steel tower 4. As a result, the power transmitted through the vertical power cable 40 is transmitted to the power cable 10.

  In addition, also about the vertical power cable 40 (40a, 40b, 40c) mentioned above, the thing using aluminum for the core wire similarly to the power cable 10 can be used. Further, unlike the power cable 10, the vertical power cable 40 (40a, 40b, 40c) does not require much consideration for weight reduction and slackness, and therefore, a cable using copper as the core wire may be used. .

FIG. 9 is another embodiment of FIG. 6, and is a front view of the steel tower 50 viewed from a direction perpendicular to the wiring direction of the overhead power transmission line 2. 10 is a side view of FIG. 9, and FIG. 11 is an enlarged view of a connecting portion between the overhead power transmission line 2 and the vertical bus 52 shown in FIG.
The tower 50 shown in FIG. 9 and FIG. 10 has a direction perpendicular to the upper armature metal 4a above the upper armature metal 4a (a direction parallel to the wiring direction of the overhead power transmission line 2 and an existing overhead armature 4a. An upper arm 51 extending in the direction along the power transmission line 7 is provided. As shown in FIG. 10, the upper arm metal 51 is provided with two gaps in a direction perpendicular to the wiring direction of the overhead power transmission line 2.

  Three polymer insulators 41 are suspended from the tip of the upper arm 51 at intervals. The three polymer insulators 41 are attached with the upper end portions of the vertical bus bars 52 (52a, 52b, 52c) being insulated from the upper arm metal 51, respectively. The vertical bus 52 is wired downward along the vertical direction in which the steel tower 50 extends from the polymer insulator 41, and is connected to the ground platform 44 located on the lower side. Unlike the vertical power cable 40 (40a, 40b, 40c), the vertical bus 52 is configured by a bare wire.

  The length over which the upper arm metal 51 extends is secured to such an extent that the insulation distance between the vertical bus 52 (details will be described later) and the steel tower 50 can be sufficiently secured. More specifically, even if the vertical bus 52 is swung by wind or the like, it is formed in a length that does not contact the steel tower 50. Similarly, the intervals between the three polymer insulators 41 are determined so that the vertical buses do not contact each other.

As shown in FIGS. 9 to 11, the vertical bus 52a and the overhead power transmission line 2a are electrically connected by a connection line 53a. More specifically, as shown in FIG. 11, connection fittings 56 are respectively attached to both ends of the connection line 53a, and by fixing these connection fittings 56 to the vertical bus 52a and the overhead power transmission line 2a, Both lines 52a and 2a are electrically connected. The connection fitting 56 can be easily attached to and detached from both the wires 52a and 2a by a fastening member such as a bolt. Thereby, the electric power sent by the overhead power transmission line 2a can be sent to the vertical bus line 52a via the connection line 53a.
Similarly, the vertical bus line 52b and the overhead power transmission line 2b are also electrically connected by the connection line 53b, and the vertical bus line 52c and the overhead power transmission line 2c are also electrically connected by the connection line 53c and send electric power to each. To be able to.

  As shown in FIG. 9, the ground mount portion 44 is not in the site of the tower 50, but in the site necessary for the overhead power transmission line 2 (in FIG. 9, in the extending direction of the upper arm 51 of the tower 50. Next to the site of the wiring route. The ground frame portion 44 is provided with three insulators 54 corresponding to the vertical buses 52 (52a, 52b, 52c). This insulator 54 is for insulating the vertical bus 52 and the ground mount part 44. The vertical bus 52 insulated by the insulator 54 is connected to the power cable 10 (10a, 10b, 10c) and the ends. The connecting portion is covered with an insulating member 55 to ensure insulation.

FIG. 12 is still another embodiment of FIG. 6, and is a front view of the steel tower 60 viewed from a direction perpendicular to the wiring direction of the overhead power transmission line 2. FIG. 13 is a side view of FIG.
The tower 60 shown in FIG. 12 includes a direction orthogonal to the existing arm brackets 4a, 4b, and 4c for supporting the overhead power transmission line 2 (a direction parallel to the wiring direction of the overhead power transmission line 2 and the overhead power transmission line). Three support arms 61a, 61b, and 61c extending in the direction along the direction of. These support arms 61a, 61b, 61c are arranged with a space therebetween in the vertical direction, and the positions of the support arms 61a are close to the three overhead power transmission lines 2a, 2b, 2c. It is like that.

  Polymer insulators 41 are respectively suspended from the end portions of these support arms 61a, 61b, 61c. Each of the polymer insulators 41 is attached with the upper ends of the vertical buses 62a, 62b, and 62c being insulated from the support arms. The vertical bus 62 is wired downward along the vertical direction in which the steel tower 50 extends from the polymer insulator 41, and is connected to the ground platform 44 located on the lower side. Unlike the vertical power cable 40 (40a, 40b, 40c), the vertical bus 62 is composed of a bare wire.

  Note that the vertical bus 62 and the overhead power transmission line 2 are electrically connected to each other with the same structure as that shown in FIG. 11 using the connection fitting 56 and the connection lines 53a, 53b, and 53c. Further, the connection at the ground mount part 44 is also electrically connected with the same structure as that shown in FIG.

According to the temporary structure and the temporary construction method of the overhead power transmission line according to the embodiment of the present invention, an insulating power cable for transmitting power in place of the overhead power transmission line 2 used in the temporary power transmission line 7 10 (10a, 10b, 10c) is installed between the column members 11 (21, 31) arranged at intervals in the site of the existing overhead power transmission line 7, so that the column members 11 (21, 31) ) Can reduce the need to secure a new site for construction. Therefore, land costs, material costs, and construction costs can be reduced compared with the conventional method.
Furthermore, since the temporary overhead transmission line 7 can be secured, not only the removal of the existing overhead transmission line 2 (2a, 2b, 2c) but also the reconstruction and new construction of the tower 4 can be performed efficiently and safely. it can. Therefore, compared with the conventional construction method, these remodeling and reconstruction works can be performed in a short period of time.

  Moreover, since the conductor of the power cable 10 (10a, 10b, 10c) is made of aluminum or an aluminum alloy, the power cable 10 can be reduced in weight and acts on the supporting pillar member 11 (21, 31). Load to be reduced. On the other hand, since the power cable 10 has high sag tension, by increasing the interval between the adjacent column members 11 (21, 31), the number required for building the column members 11 (21, 31) is reduced. can do. Further, it is possible to reduce the necessity of newly securing a site necessary for constructing the column member 11 (21, 31).

  Further, since the pillar member 11 (21, 31) is installed in the site of the existing railway line or in a gutter or side wall of the expressway, a new site for constructing the pillar member 11 (21, 31) is provided. The need for securing can be reduced. Therefore, land costs, material costs, and construction costs can be reduced compared with the conventional method.

In addition, the steel tower 4 has an insulating coating, is branched from the overhead power transmission line 2 (2a, 2b, 2c) installed on the upper part of the existing steel tower 4, and is wired downward along the steel tower 4 body. Since the vertical power cable 40 (40a, 40b, 40c) having insulation is connected to the power cable 10 (10a, 10b, 10c) in the site of the steel tower 4 or in the site of the existing overhead power transmission line 7, It is not necessary to secure a new site for the connection between the vertical power cable 40 and the power cable 10. Therefore, the cost for securing land can be reduced.
Further, since the vertical power cable 10 having insulating properties is used, it can be branched from the overhead power transmission line 2 near the tower 4 and wired downward along the tower 4. The necessary space can be reduced. Thereby, a large working space can be secured.

  Furthermore, a brace 51 (or 61a, 61b, 61c) extending from the steel tower 50 (or 60) in the wiring direction of the overhead power transmission line 2 is provided, and the brace 51 (or 61a, 61b, 61c) is provided. The vertical buses 52a, 52b, 52c (or 62a, 62b, 62c) extending from the lower side to the lower side and connected to the overhead power transmission line 2 are wired, and the vertical buses 52a, 52b, 52c (or 62a) , 62b, 62c) are connected to the power cables 10 (10a, 10b, 10c) in the site of the steel tower 4 or in the site of the overhead power transmission line 7, so that the vertical buses 52a, 52b, 52c (or 62a, 62b) 62c) and the power cable 10 need not be secured for a new site. Therefore, the cost for securing land can be reduced.

  Furthermore, since the vertical buses 52a, 52b, 52c (or 62a, 62b, 62c) are attached via the polymer insulator 41 suspended from the arm metal 51 (or 61a, 61b, 61c), Among the insulators, the polymer insulator 41 having particularly lightweight characteristics can prevent the arm metal 51 (or 61a, 61b, 61c) from being loaded by weight. In particular, since the vertical buses 52a, 52b, 52c (or 62a, 62b, 62c) are bare wires, it is necessary to increase the protruding length in order to ensure a sufficient distance from the steel tower 50 (or 60). There is. Therefore, by reducing the load acting on the tip portion of the cantilever, it is not necessary to secure the structural strength more than necessary, and the cost of the arm bracket 51 (or 61a, 61b, 61c) can be reduced. Can do.

As mentioned above, although the temporary structure and the temporary construction method of the overhead power transmission line according to the embodiment of the present invention have been described, the present invention is not limited to the embodiment described above, Variations and changes are possible.
For example, in the present embodiment, as shown in FIG. 1, the power cable 10 (10a, 10b, 10c) in the temporary overhead transmission line 8 is replaced with the overhead transmission line 2 (2a, 2b, 2c), it is not necessary to be along the overhead power transmission line 2 when considering a location where the pillar member 11 (21, 31) is easy to construct. That is, the pillar member 11 (21, 31) may be constructed in a place where it is not necessary to secure a new site within the existing site, and there is no problem even if the wiring route becomes a curved route.

  In the present embodiment, the vertical power cable 40 (40a, 40b, 40c) and the power cable 10 (10a, 10b, 10c) are connected by the ground mount unit 44. Instead of providing 40, the power cable 10 may be extended to the branch sleeve 42 as it is. At this time, in the ground mount part 44, as shown in FIG. 14, the power cable 10 is fixed to the support fittings 70a and 70b for supporting the power cable 10, and the fixing parts 71a and 71b are configured.

  Further, when connecting the vertical power cable 40 and the power cable 10, as shown in FIG. 15, a wiring connection portion 72 for connecting both the wires 10 and 40 between the fixing portions 71 a and 71 b described above is provided. It may be provided. Thereby, a tensile force, a bending force, etc. can be prevented from acting on the connection part of both the wires 10 and 40. FIG.

DESCRIPTION OF SYMBOLS 1 Temporary structure of overhead power transmission line 2 Existing overhead power transmission line 3 Substation 4 Steel tower 4a, 4b, 4c Arm metal 5 Insulator 6 Jumper line 7 Existing overhead power transmission line 8 Temporary power transmission line 10 (10a, 10b, 10c) Power cable 11, 21, 31 pillar member 12, 22, 32 pillar body part 13, 23, 33 cable support part 14 core wire 15 insulator 16 shielding copper tape 17 lashing wire 18 triplex type power cable 40 (40a, 40b, 40c) Longitudinal power cable 41 Polymer insulator 42 Branch sleeve 43 Insulating member 44 Ground mount 50 Steel tower 51 Upper arm 52 (52a, 52b, 52c) Vertical power cable 53a, 53b, 53c Connection line 54 Insulator 55 Insulation member 56 Connection fitting 60 Steel tower 61a, 61b, 61c Additional arm 62 (62a, 62b, 6 2c) Vertical power cables 70a, 70b Support brackets 71a, 71b Fixing part 72 Wiring connection part 100 Overhead transmission line 100a Temporary overhead transmission line 101 Existing tower 101a New tower 102 Substation 103 Temporary overhead transmission line 104 Existing overhead Power transmission line

Claims (10)

A temporary structure of an overhead power transmission line for constructing a temporary overhead power transmission line in place of the existing overhead power transmission line installed at the top of the steel tower ,
An aerial system characterized in that, in place of an existing overhead power transmission line, an insulating power cable for transmitting power is installed between pillar members arranged at intervals in the site of the existing overhead power transmission line Temporary structure of transmission lines.   The temporary structure of the overhead power transmission line according to claim 1, wherein a conductor of the power cable is formed of aluminum or an aluminum alloy.   The temporary structure of the overhead power transmission line according to claim 1 or 2, wherein the pillar member is installed in a site of an existing railway line or in a gutter or a side wall of an expressway. A vertical power cable having an insulating property branched from the existing overhead transmission line and routed downward along the main body of the tower , and the power cable in the site of the tower or in the site of the overhead transmission line The temporary structure of the overhead transmission line according to any one of claims 1 to 3, wherein the temporary transmission line is connected.   Provided with a brace extending in the wiring direction of the overhead power transmission line from the steel tower, the vertical bus connected in a manner branched from the overhead power transmission line while being wired downward from the arm metal, within the site of the steel tower The temporary structure of the overhead power transmission line according to any one of claims 1 to 3, wherein the power cable is connected to a site of the overhead power transmission line.   6. The overhead transmission line according to claim 5, wherein the arm metal is provided with a polymer insulator for supporting an upper end portion of the vertical bus bar and insulating the vertical bus line from the arm metal. Temporary structure. A temporary construction method for an overhead power transmission line that replaces the existing overhead power transmission line,
An aerial system characterized in that, in place of an existing overhead power transmission line, an insulating power cable for transmitting power is installed between pillar members arranged at intervals in the site of the existing overhead power transmission line Temporary construction method for transmission lines.   The temporary construction method for an overhead power transmission line according to claim 7, wherein the column member is installed in a site of an existing railway line or in a gutter or a side wall of an expressway.   A vertical power cable having an insulating property branched from the overhead power transmission line installed on the upper part of an existing steel tower and wired downward along the tower main body is installed in the site of the steel tower or the site of the overhead power transmission line. The temporary construction method for an overhead power transmission line according to claim 7, wherein the temporary power transmission line is connected to the power cable.   From the armature extending from the steel tower in the wiring direction of the overhead power transmission line, the vertical bus connected in a manner to be routed downward and branched from the overhead power transmission line, in the site of the steel tower or of the overhead power transmission line The temporary construction method for an overhead power transmission line according to any one of claims 7 to 9, wherein the power cable is connected within a site.

Images