JP2018100085A - On-water overhead power transmission system, installation method for power transmission tower and installation method for on-water overhead power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-water overhead power transmission system, an installation method for a power transmission tower and an installation method for an on-water overhead power transmission system capable of bringing down expense of installation cost.SOLUTION: An on-water overhead power transmission system includes a power transmission tower provided on water and a linear body supported by the power transmission tower. The power transmission tower is composed of a taut mooring type floating structure having: a buoyant tank; a linear supporting body provided on the buoyant tank; and a gravity anchor connected through a tendon to the buoyant tank.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a floating overhead power transmission system, a method for installing a power transmission tower, and a method for installing a floating overhead power transmission system.

  2. Description of the Related Art A power transmission system for supplying and communicating power through an ocean area is known. An example of such a power transmission system is a system that supplies power to land from a power generation system such as a wind power generation system installed on the ocean. Conventionally, in a power transmission system installed in an ocean area, power is transmitted between an offshore system and an onshore system using a power transmission cable laid on the seabed.

Japanese Patent No. 5565803 Japanese Patent No. 5670128 JP 2014-093902 A JP-A-11-308746 JP 59-2519 A

  However, the transmission cable laid on the sea floor is not only expensive, but also has a high construction cost for laying and maintenance, and the proportion of the total system cost is very large. In particular, when a power transmission system is constructed with equipment provided on a floating structure that oscillates on the water surface, the cost of the power transmission cable and its installation / maintenance cost are very high. Therefore, a power transmission system that can be realized at a lower cost has been desired.

  As a power transmission method, it is conceivable to adopt overhead power transmission instead of the above-mentioned submarine power transmission. Overhead power transmission is a power transmission method in which power transmission towers for supporting power transmission cables are installed side by side, and power is transmitted using power transmission cables that are bridged between the power transmission towers. According to this method, since there is no expensive seabed laying, a power transmission system can be constructed at low cost.

  However, in order to transmit power to the ocean, it is necessary to install a power transmission tower in the ocean area, so the construction cost for installing the power transmission tower on the sea floor is very high, and it must be in a shallow water area. It could not be installed. For this reason, the installation location is limited, and the effect of cost reduction due to the adoption of overhead power transmission cannot be obtained sufficiently.

  An object of the present invention is to provide a floating overhead power transmission system, a transmission tower installation method, and a floating overhead power transmission system installation method that can reduce the installation cost.

  According to one aspect of the present invention, there is a floating overhead power transmission system including a power transmission tower provided on water and a linear body supported by the power transmission tower, the power transmission tower including a buoyancy tank and the buoyancy There is provided an aerial overhead power transmission system comprising a tension mooring type floating body structure having a support for the linear body provided in a tank and a gravity anchor connected to the buoyancy tank via a tendon.

  According to another aspect of the present invention, there is provided a method of installing a power transmission tower for supporting a linear body on water, the buoyancy tank provided with the linear body support, an anchor, A gravity anchor provided with a tank for floating and sinking is towed to the installation place of the transmission tower in a state of floating on the water, poured into the tank for floating and sinking, the gravity anchor is submerged to the bottom of the water, and the gravity via the tendon By mooring the buoyancy tank connected to the anchor in water, a power transmission tower installation method is provided in which a power transmission tower made of a tension mooring type floating structure is installed.

  According to still another aspect of the present invention, there is provided a method for installing an aerial overhead power transmission system including a plurality of power transmission towers for supporting a linear body on water, each of the plurality of power transmission towers. Comprises a support body for the linear body, a buoyancy tank provided with the support body, and a gravitational anchor including an anchor and a tank for floating and sinking, and the linear body is disposed on the support body of the power transmission tower. And a step of towing the buoyancy tank and the gravitational anchor of the power transmission tower supporting the linear body in a state of floating on water for each of the plurality of power transmission towers. There is provided a method for installing an aerial overhead power transmission system characterized in that it includes a step of repeating sequentially.

  According to still another aspect of the present invention, there is provided a method for installing an aerial overhead power transmission system including a plurality of power transmission towers for supporting a linear body on water, each of the plurality of power transmission towers. Comprises a support body for the linear body, a buoyancy tank provided with the support body, and a gravitational anchor including an anchor and a sink and sink tank, and the buoyancy tank of each of the plurality of power transmission towers. And a step of towing the gravity anchor to an installation location in a floating state, a step of laying the linear body on the water along the plurality of power transmission towers, and the linear shape laid on the water And a step of supporting a body on each support of each of the plurality of power transmission towers at a support position corresponding to each of the plurality of power transmission towers. Provided.

  ADVANTAGE OF THE INVENTION According to this invention, a power transmission tower with few rocking | fluctuation can be installed on water at low cost irrespective of an installation place. In addition, this makes it possible to easily construct an aerial power transmission on the water and greatly reduce the cost of laying the transmission line.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the surface overhead power transmission system by 1st Embodiment of this invention. It is a figure which shows schematic structure of the power transmission tower in the surface overhead power transmission system by 1st Embodiment of this invention. It is the schematic which shows the installation method of the power transmission tower in the surface overhead power transmission system by 1st Embodiment of this invention. It is a figure which shows schematic structure of the surface overhead power transmission system by 2nd Embodiment of this invention. It is a figure which shows schematic structure of the power transmission tower in the surface overhead power transmission system by 2nd Embodiment of this invention. It is a figure which shows schematic structure of the line length adjusting device in the power transmission tower of the aerial overhead power transmission system by 2nd Embodiment of this invention. It is a figure which shows schematic structure of the insulation arm in the power transmission tower of the aerial overhead power transmission system by 2nd Embodiment of this invention. It is a block diagram which shows schematic structure of the control apparatus in the power transmission tower of the aerial overhead power transmission system by 2nd Embodiment of this invention. It is the schematic (the 1) which shows the installation method of the surface overhead power transmission system by 2nd Embodiment of this invention. It is the schematic (the 2) which shows the installation method of the aerial overhead power transmission system by 2nd Embodiment of this invention. It is the schematic (the 1) which shows the installation method of the surface overhead power transmission system by the modification of 2nd Embodiment of this invention. It is the schematic (the 2) which shows the installation method of the surface overhead power transmission system by the modification of 2nd Embodiment of this invention. It is a figure which shows schematic structure of the line length adjusting device by 3rd Embodiment of this invention. It is a figure which shows schematic structure of the line length adjusting device by 4th Embodiment of this invention. It is a figure which shows the other schematic structure of the line length adjusting device by 4th Embodiment of this invention. It is the schematic (the 1) which shows the installation method of the power transmission tower by 5th Embodiment of this invention. It is the schematic (the 2) which shows the installation method of the power transmission tower by 5th Embodiment of this invention. It is the schematic (the 3) which shows the installation method of the power transmission tower by 5th Embodiment of this invention. It is the schematic (the 4) which shows the installation method of the power transmission tower by 5th Embodiment of this invention. It is the schematic (the 5) which shows the installation method of the power transmission tower by 5th Embodiment of this invention. It is the schematic (the 6) which shows the installation method of the power transmission tower by 5th Embodiment of this invention. It is the schematic (the 7) which shows the installation method of the power transmission tower by 5th Embodiment of this invention. It is the schematic (the 8) which shows the installation method of the power transmission tower by 5th Embodiment of this invention. It is the schematic (the 9) which shows the installation method of the power transmission tower by 5th Embodiment of this invention.

[First Embodiment]
A waterborne overhead power transmission system according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  FIG. 1 is a diagram showing a schematic configuration of a waterborne overhead power transmission system according to the present embodiment. FIG. 2 is a diagram illustrating a schematic configuration of a power transmission tower in the aerial overhead power transmission system according to the present embodiment. FIG. 3 is a schematic diagram illustrating a method for installing a power transmission tower in the aerial overhead power transmission system according to the present embodiment.

  First, the schematic configuration of the aerial overhead power transmission system according to the present embodiment will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the aerial overhead power transmission system 100 according to the present embodiment connects the offshore structure 10 installed on the ocean, and the equipment installed on the offshore structure 10 and the onshore equipment (not shown). And a power transmission tower 30 that supports the linear body 20 on the ocean.

  The offshore structure 10 is an offshore structure including power generation equipment, substation equipment, other electrical equipment, optical equipment for transmitting and receiving optical signals, and the like. The offshore structure 10 may be a floating structure as illustrated, or may be a landing structure. The offshore structure 10 is not particularly limited, and examples include a wind power generation system, a wave power generation system, a tidal current power generation system, an offshore aquaculture system, an aquaculture automatic feeding system, an offshore mobile phone base station, and the like. . Moreover, although it is not the offshore structure 10, the power transmission system of this invention can also be utilized as an alternative of the submarine power transmission cable in the power transmission to a remote island, etc.

  The linear body 20 is a cable for electrically or optically connecting the facility of the offshore structure 10 and the onshore facility, and may be a communication cable as well as a power transmission cable. Further, it is not always necessary for the linear body 20 to use an aerial power transmission system over the entire path connecting the facilities of the offshore structure 10 and the land facilities, and a submarine power transmission system is used for part of the path. Also good. In addition, since the cable for aerial transmission does not need the water pressure resistance and water blocking functions required for the submarine transmission cable, the overhead transmission system has the advantage of reducing cable costs compared to the submarine transmission system. There is. Although it does not specifically limit as a power transmission cable used as the linear body 20, For example, the steel core aluminum strand generally used for an overhead power transmission line, a corrosion-proof steel core aluminum strand, etc. may be illustrated. it can.

  For example, it is difficult to use an aerial power transmission system over the entire path connecting the facilities of the offshore structure 10 and the land facilities in order to cope with fishing rights, the route of the large ship 52, etc. in long-distance power transmission. A case is assumed. In such a case, for example, as shown in FIG. 1, the underwater power transmission line 20B can be arranged in some areas, and the aerial transmission line 20A can be arranged in other areas. In addition, since the oscillation of the power transmission tower 30 can be reduced by using a TLP type structure, which will be described later, as the power transmission tower 30, a cable such as a riser cable that is expensive and expensive to lay compared to the catenary mooring method. It is possible to lay submarine cables without using a cable.

  The linear body 20 is not particularly limited, and may be, for example, any of a cable including only a power line, a cable including only an optical fiber core, and a composite cable of a power line and an optical fiber core. .

  For example, as shown in FIG. 2, the power transmission tower 30 includes a support 32, a buoyancy tank 34, a tendon 36, and a float-and-sink type gravity anchor 38. The support body 32 is fixed to the buoyancy tank 34 and supports the linear body 20 at the top. The buoyancy tank 34 and the ups and downs gravity anchor 38 are connected by a tendon 36. The tendon 36 is tensioned by the buoyancy generated by the buoyancy tank 34 and the gravity generated by the buoyancy-type gravity anchor 38, and the buoyancy tank 34 is moored underwater by the buoyancy-type gravity anchor 38 via the tendon 36. That is, the power transmission tower 30 is a TLP (Tension Leg Platform) type floating body structure.

  The support 32 is desirably a structure having a frame structure made of a rod-shaped member, particularly a truss structure, from the viewpoint of reducing weight, reducing wave force, and wind pressure resistance. The rod-shaped member may be metal like a power transmission tower provided on the ground, but from the viewpoint of corrosion resistance and weight reduction, fiber reinforced plastic (FRP), glass fiber reinforced plastic (GFRP: Glass Fiber-) Composite materials such as Reinforced Plastics are desirable. The rod-shaped member has a minimum diameter that does not buckle due to wave force or wind pressure. The outline of the support 32 is, for example, a height from the water surface 50 of about 20 m to 30 m, a draft amount of about 10 m, and a drainage amount of about 60 tons. If there is such a water surface height, the passage of the small vessel 54 such as a fishing boat is not hindered by the linear body 20.

  The buoyancy tank 34 has sufficient buoyancy to float on the water surface 50 with the support 32 installed. The buoyancy tank 34 is preferably made of a composite material in the same manner as the support 32 from the viewpoint of weight reduction and the like.

  The up-and-down gravity anchor 38 includes, for example, a concrete anchor 40 and a up-and-down tank 42. The anchor 40 has a sufficient weight for mooring the buoyancy tank 34 provided with the support 32 to the bottom of the water. The float / sink tank 42 can float the anchor 40 on the water by being filled with air. Thus, the floating gravity anchor 38 sinks to the bottom of the water when it is poured into the floating tank 42 and functions as a gravity anchor. When the floating tank 42 is filled with air, it floats on the water surface 50 and can be towed.

  The buoyancy tank 34 and the ups and downs type gravity anchor 38 are preferably formed in a triangular hollow structure as shown, for example. As a result, it is possible to prevent grinding when the buoyancy tank 34 and the ups and downs-type gravity anchor 38 sink.

  Next, the installation method of the power transmission tower 30 used for the aerial overhead power transmission system according to the present embodiment will be described with reference to FIG.

  Since the power transmission tower 30 is manufactured at a factory away from the installation location, the power transmission tower 30 needs to be transported by the tow ship 60 through the marine area to the installation site.

  At the time of transportation from the factory to the site, the floating tank 42 of the floating gravity anchor 38 is filled with air. As a result, the floating gravity anchor 38 floats on the water surface 50 and can be towed in a state having stability. Since the floating gravity anchor 38 floats on the water surface 50, the buoyancy tank 34 provided with the support 32 is also lifted by surplus buoyancy and can be towed in a state of stability (FIG. 3 (a)). ).

  In this state, the buoyancy tank 34 provided with the support body 32 and the ups and downs type gravity anchor 38 are towed to the site where the power transmission tower 30 is installed. In the power transmission tower 30 of the present embodiment, the buoyancy tank 34 and the float-and-sink type gravity anchor 38 can themselves be handled as a floating structure as described above. It is unnecessary.

  FIG. 3A shows an example of towing in a state where the buoyancy tank 34 and the ups and downs type gravity anchor 38 are connected by a tendon 36. However, the buoyancy tank 34 and the ups and downs-type gravity anchor 38 may be towed in a state where they are connected by the tendon 36, or may be connected by the tendon 36 after being transported to the site.

  After the buoyancy tank 34 provided with the support body 32 and the ups and downs gravity anchor 38 are transported to the site, water is poured into the ups and downs tank 42 of the ups and downs gravity gravity anchor 38, and the ups and downs gravity anchor 38 sinks to the bottom of the water (sea floor). Let The buoyancy tank 34 is drawn into the water by the floating gravity anchor 38 through the tendon 36, and the tendon 36 is tensed by the buoyancy of the buoyancy tank 34 and the gravity of the floating gravity anchor 38. It is moored to a predetermined depth in accordance with this (FIG. 3 (b)).

  The depth at which the buoyancy tank 34 is moored can be adjusted by the length of the tendon 36, and the power transmission tower 30 can be installed regardless of the water depth. Therefore, according to this method, the freedom degree of selection of the installation place of the power transmission tower 30 can be expanded.

  Thus, after installing the power transmission tower 30 in a desired place, the linear body 20 is laid through the power transmission tower 30 between the electric equipment of the offshore structure 10 and the electric equipment on land.

  The power transmission tower installation method according to the present embodiment does not require a transport barge or a crane ship, as described above, when transporting the buoyancy tank 34 provided with the support 32 and the floating and sinking gravity anchor 38. That is, a large work ship is not required for installing the power transmission tower 30, and the transportation cost of the power transmission tower 30 can be greatly reduced. Further, since the transmission tower 30 is a floating structure, it can be installed regardless of the water depth and the construction cost is low.

  Therefore, according to the installation method of the power transmission tower according to the present embodiment, the installation cost can be greatly reduced as compared with the underwater power transmission system.

[Second Embodiment]
A waterborne overhead power transmission system according to a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  The basic configuration of the aerial overhead power transmission system 200 according to the present embodiment is substantially the same as that of the aerial overhead power transmission system 100 according to the first embodiment. The aerial overhead power transmission system 200 according to the present embodiment is such that the power transmission tower 230 further includes a line length adjusting device 202 that adjusts the length of the electric wire 220 used as the linear body 20. Different from the system 100.

  First, a schematic configuration of the aerial overhead power transmission system 200 according to the present embodiment will be described with reference to FIG. FIG. 4 is a diagram illustrating a schematic configuration of the aerial overhead power transmission system 200 according to the present embodiment.

  As shown in FIG. 4, the aerial overhead power transmission system 200 according to the present embodiment includes an electric wire 220 and a power transmission tower 230 that supports the electric wire 220 on the ocean. A plurality of power transmission towers 230 are installed on the ocean. The plurality of power transmission towers 230 are numbered, with the land side being the younger number side and the ocean upper side being the older number side. As will be described later, the power transmission tower 230 according to the present embodiment includes a line length adjusting device 202 that adjusts the length of the electric wire 220 and a control device 204 that controls the line length adjusting device 202.

  Similar to the linear body 20 of the first embodiment, the electric wire 220 is a cable for connecting equipment installed on the offshore structure 10 and land equipment (not shown). In the present embodiment, an electric wire 220 is used as the linear body 20. Although the electric wire 220 is not specifically limited, Bare electric wires, such as a steel core aluminum strand generally used for an overhead power transmission line, a corrosion-proof steel core aluminum strand, are illustrated. The electric wire 220 is bridged between the adjacent power transmission towers 230. An overhead ground wire 222 is bridged between the upper portions of the adjacent power transmission towers 230. Moreover, although FIG. 4 shows the case where the single-wire electric wire 220 is supported for convenience, it is not limited to this. A plurality of electric wires 220 such as an electric wire 220 constituting a three-phase three-wire two-line power transmission line can be similarly supported.

  The power transmission tower 230 according to the present embodiment includes a line length adjusting device 202 and a control device 204 in addition to the basic configuration substantially similar to the configuration of the power transmission tower 30 according to the first embodiment. Hereinafter, the configuration of the power transmission tower 230 according to the present embodiment will be described with reference to FIGS. FIG. 5 is a diagram showing a schematic configuration of the power transmission tower 230 in the aerial overhead power transmission system 200 according to the present embodiment. FIG. 6 is a diagram illustrating a schematic configuration of the line length adjusting device 202 in the power transmission tower 230 according to the present embodiment, in which FIG. 6A is a side view and FIG. 6B is a top view. FIG. 7 is a diagram illustrating a schematic configuration of the insulating arm 206 in the power transmission tower 230 according to the present embodiment. FIG. 8 is a block diagram illustrating a schematic configuration of the control device 204 in the power transmission tower 230 according to the present embodiment.

  For example, as shown in FIGS. 4 and 5, the power transmission tower 230 includes a support body 232, a buoyancy tank 234, a tendon 236, and a floating gravity anchor 238. The up and down gravity anchor 238 includes an anchor 240 and a up and down tank 242. The support body 232 has the same configuration as that of the support body 32 according to the first embodiment, except for the configuration for supporting the electric wire 220. The buoyancy tank 234, tendon 236, and the float-and-sink type gravity anchor 238 have the same configuration as the buoyancy tank 34, tendon 36, and the float-and-sink type gravity anchor 38 according to the first embodiment, respectively. The anchor 240 and the float / sink tank 242 have the same configuration as the anchor 40 and the float / sink tank 42 according to the first embodiment, respectively.

  The power transmission tower 230 further includes a line length adjusting device 202, a control device 204, an insulating arm 206, a GNSS (Global Navigation Satellite System) antenna 208, a metal cap 212, and a ground plate 214. have.

  In the present embodiment, as described later, the support position of the electric wire 220 in the power transmission tower 230 is measured using GNSS. The GNSS is not particularly limited, and examples thereof include GPS (Global Positioning System), Galileo, GLONASS (Global Navigation Satellite System), and a compass. Instead of GNSS, an RNSS (Regional Navigation Satellite System), which is a navigation satellite system for a specific area according to the installation location of the aerial overhead power transmission system 200, can be used.

  In this embodiment, the support body 232 supports the electric wire 220 with the wire length adjusting device 202 suspended from the insulating arm 206 as described below.

  The support 232 is provided with an insulating arm 206 for supporting the line length adjusting device 202. In FIG. 5, in order to support the electric wire 220 as each transmission line constituting the three-phase three-wire type two-line transmission line, two pieces are provided on each of the upper stage part, the middle stage part, and the lower stage part of the support body 232 in total. The case where the insulating arm 206 of the book is provided is illustrated. The number of insulating arms 206 and the installation position on the support 232 are not limited to six, and can be set as appropriate according to the number of electric wires 220 to be supported.

  A wire length adjusting device 202 is suspended and supported at the tip of the insulating arm 206. The wire length adjusting device 202 includes an electric wire 220 bridged between the adjacent young transmission tower 230 and an electric cable 220 bridged between the adjacent old transmission tower 230. It is supported. The lengths of the electric wires 220 supported by the line length adjusting device 202 can be adjusted by the line length adjusting device 202 as described later. The electric wire 220 supported by the line length adjusting device 202 and the power transmission tower 230 are insulated by an insulating arm 206.

  A GNSS antenna 208 that receives GNSS signals from a plurality of GNSS satellites 272 is attached to the tip of the insulating arm 206 on which the line length adjusting device 202 is suspended and supported. The GNSS antenna 208 is attached in the vicinity of a support position where the wire length adjusting device 202 supports the electric wire 220.

  The top of the support 232 is provided so as to cover a metal cap 212 that is a metal fitting for lightning protection. On the other hand, a grounding plate 214 made of a conductive material such as a metal is provided on the lower surface of the float / sink type gravity anchor 238, that is, the lower surface of the anchor 40. The metal cap 212 and the ground plate 214 are electrically connected to each other by a conductive cable 216. The conductive cable 216 forms a conduction path through which a current flows between the metal cap 212 and the ground plate 214. Note that the conduction path between the metal cap 212 and the ground plate 214 can be formed using a conductive material for the support 232, the tendon 236, and the like constituting the power transmission tower 230. In this case, the conductive cable 216 is not always necessary.

  As described in the first embodiment, the rod-shaped member constituting the support 232 is preferably a composite material such as FRP or GFRP from the viewpoint of corrosion resistance, weight reduction, and the like. Composite materials are generally considered to be more susceptible to damage from lightning strikes than metal positive materials. For this reason, when a composite material is used for the rod-shaped member constituting the support body 232, it is preferable to enhance the lightning resistance performance, although there are merits such as corrosion resistance. Many lightning strikes to the power transmission tower 230 are observed near the top of the head. For this reason, by providing a structure in which the metal cap 212 is covered with the composite material at the top of the support 232, it is possible to provide the power transmission tower 230 that is excellent not only in corrosion resistance and light weight but also in lightning resistance.

  Further, in the installed power transmission tower 230, the floating gravity anchor 238 sinks to the sea floor, but is not fixed to the sea floor. For this reason, it is preferable to reduce the ground resistance in order to secure a path for releasing the lightning strike current from the overhead ground wire 222 during a lightning strike on the power transmission tower 230. In the present embodiment, since the ground plate 214 is provided on the lower surface of the anchor 240, the ground resistance can be sufficiently reduced, and a lightning strike current can be released to the bottom of the sea to escape. The area of the ground plate 214 can be set to a desired area necessary for sufficiently reducing the ground resistance.

  Note that the power transmission tower 30 according to the first embodiment may also include the metal cap 212, the ground plate 214, and the conductive cable 216 as in the present embodiment.

  In addition, a control device 204 that controls the line length adjusting device 202 is attached to the inside of the frame structure formed by the rod-shaped members of the support body 232. A line length adjusting device 202 is connected to the control device 204 so as to be controllable by a wired or wireless system. A GNSS antenna 208 is connected to the control device 204. In addition, the attachment position of the control apparatus 204 is not limited to the inside of the framework structure of the support body 232, and any position of the power transmission tower 230 can be appropriately selected. Moreover, the control apparatus 204 does not necessarily need to be attached to the power transmission tower 230. For example, the control device 204 may be installed in a management facility on land or offshore, and may be configured to control the line length adjusting device 202 remotely by wireless communication or wired communication.

  Next, the line length adjusting device 202, the insulating arm 206, and the control device 204 will be described in detail.

  As shown in FIGS. 6A and 6B, the line length adjusting device 202 includes a pair of gold wheels 262a, 262b, lower frames 264a, 264b, a connecting frame 266, and an upper frame 268. Have.

  Each of the gold wheels 262a and 262b is a roller-shaped or wheel-shaped rotating body that can rotate around a rotation axis. The gold wheels 262a and 262b are metal rotating bodies, but may be rotating bodies made of a conductive material.

  The gold wheels 262a and 262b are rotatably supported by the lower frames 264a and 264b, respectively, such that the rotation shafts are horizontal and the rotation shafts are arranged in parallel to each other. The gold wheels 262a and 262b are arranged so as to line up along the line direction of the electric wire 220 laid over the adjacent power transmission tower 230.

  Each of the gold wheels 262a and 262b has a built-in rotation motor 274, and is configured to be able to rotate forward and backward by the rotational drive of the rotation motor 274. The rotation of the gold wheels 262a and 262b is controlled by the control device 204, respectively. The rotary motor 274 is supplied with power by a power supply device (not shown) such as a solar cell or a battery.

  Grooves 270 are formed on the outer peripheral surfaces of the gold wheels 262a and 262b in a spiral shape from one end side to the other end side. The electric wires 220 are wound around the outer peripheral surfaces of the gold wheels 262a and 262b while being accommodated in the grooves 270 along the grooves 270, respectively. The electric wire 220 is electrically connected to the contacting gold wheels 262a and 262b by being wound around the gold wheels 262a and 262b.

  The electric wires 220 wound around the gold wheels 262a and 262b are respectively sent from one end side of the gold wheels 262a and 262b, and are bridged over the adjacent power transmission tower 230 on the young or old number side. The electric wire 220 sent out from one end side of the gold wheel 262a is bridged to the adjacent young power transmission tower 230. Moreover, the electric wire 220 sent out from the one end side of the gold wheel 262b is bridged to the adjacent old power transmission tower 230.

  The ends of the electric wires 220 wound around the gold wheels 262a and 262b are fixed to the gold wheels 262a and 262b on the other end sides of the gold wheels 262a and 262b, respectively. For example, the electric wire 220 is fixed and fixed to the gold wheels 262a and 262b. In addition, the fixing method to the gold wheels 262a and 262b of the end portion of the electric wire 220 is not particularly limited, and various methods can be adopted in addition to a method of lashing.

  An anticorrosive agent is applied to the electric wire 220 wound around the gold wheels 262a and 262b. In addition, as demonstrated in 3rd Embodiment, an anticorrosive agent can also be applied to the electric wire 220 using anticorrosive agent tank 404a, 404b.

  The lower frames 264a and 264b that respectively support the gold wheels 262a and 262b are made of a conductive material such as metal. The lower frames 264a and 264b have sliding portions 264s that slide in contact with the gold wheels 262a and 262b, respectively. The lower frames 264a and 264b are electrically connected to the gold wheels 262a and 262b through sliding portions 264s, respectively. It is preferable that at least the sliding portion 264s of the lower frames 264a and 264b is made of a material having excellent wear resistance.

  The lower frames 264a and 264b are connected by a connecting frame 266 provided between them. The connection frame 266 is made of a conductive material such as metal. The lower frames 264a and 264b are electrically connected to each other by a connecting frame 266.

  The lower frames 264a, 264b and the connecting frame 266 that slide with the gold wheels 262a, 262b and the sliding portion 264s function as an electrical connection portion that electrically connects the pair of gold wheels 262a, 262b to each other.

  As described above, in the wire length adjusting device 202, the electric wire 220 wound around the gold wheel 262a is electrically connected to the gold wheel 262a. Further, the gold wheel 262a is electrically connected to the lower frame 264a via the sliding portion 264s of the lower frame 264a. In addition, the lower frame 264a is electrically connected to the lower frame 264b through a connecting frame 266. The lower frame 264b is electrically connected to the gold wheel 262b via the sliding portion 264s. Furthermore, the gold wheel 262b is electrically connected to the electric wire 220 wound around the gold wheel 262b. Thus, the electric wire 220 wound and supported by one of the gold wheels 262a is electrically connected to the electric wire 220 wound and supported by the other gold wheel 262b. Thereby, the electrical connection of the electric wire 220 separated and supported by the gold wheels 262a and 262b of the line length adjusting device 202 is ensured, and it can function as a power transmission line supported by the line length adjusting device 202.

  The wire length adjusting device 202 winds the electric wire 220 around the gold wheels 262a and 262b, or sends the electric wire 220 to the gold wheels 262a and 262b, so that the electric wire between the power transmission tower 230 and the power transmission tower 230 adjacent thereto. Adjust the length of 220.

  The line length adjusting device 202 is supported by an insulating arm 206 attached to a support body 232. More specifically, as shown in FIG. 7, the line length adjusting device 202 is suspended and supported by an insulating arm 206 constituted by a so-called awning insulator. The insulating arm 206 includes a strut portion 278 that is a lower arm portion that extends in the lateral direction, a stay portion 280 that is an upper arm portion that extends obliquely downward, a yoke 282, and a clamp 284.

  The strut portion 278 includes a polymer insulator 286 and an arc horn 288 attached to both ends of the polymer insulator 286. The stay portion 280 includes a polymer insulator 290 and arc horns 292 attached to both ends of the polymer insulator 290. By configuring the strut portion 278 and the stay portion 280 constituting the insulating arm 206 with the polymer insulators 286 and 290, respectively, the insulating arm 206 can be reduced in weight as compared with the case where the insulating arm 206 is configured with a ceramic insulator. Thereby, the transmission tower 230 can be made compact and lightweight. Note that it is not always necessary to configure both the strut portion 278 and the stay portion 280 with a polymer insulator, and either one can be configured with a polymer insulator and the other can be configured with a porcelain insulator such as a smog insulator. Further, when it is not necessary to make the power transmission tower 230 compact or the like, both the strut portion 278 and the stay portion 280 can be configured with porcelain insulators.

  The distal end portion of the strut portion 278 and the distal end portion of the stay portion 280 are each attached to the yoke 282 with a coupling fitting, and are connected in a lateral V shape via the yoke 282.

  The base end portion of the strut portion 278 is attached to the support body 232 with a mounting bracket 294 so as to be swingable in the line direction of the electric wire 220 spanned between adjacent power transmission towers 230. Similarly, the base end portion of the stay portion 280 is also attached to the support body 232 with a mounting bracket 296 so as to be swingable in the line direction of the electric wire 220. Thus, the insulating arm 206 is attached to the support 232 so as to be swingable in the line direction of the electric wire 220.

  The yoke 282 is provided with a clamp 284. An upper frame 268 of the line length adjusting device 202 is suspended from the clamp 284. Thereby, the wire length adjusting device 202 is suspended and supported by the yoke 282 via the clamp 284. The wire length adjusting device 202 is supported in a suspended manner so that the line direction of the electric wire 220 is orthogonal or intersects with a predetermined angle with respect to a plane formed by the central axis of the strut portion 278 and the central axis of the stay portion 280.

  As described above, in this embodiment, the insulating arm 206 is attached to the support 232 so as to be swingable in the line direction of the electric wire 220. For this reason, even if the power transmission tower 230 is swung due to waves or wind and the support position of the electric wire 220 is moved, the insulation arm 206 is swung accordingly, thereby balancing the tension in the electric wire 220. Can be maintained. Thus, according to the present embodiment, the stress concentration on the electric wire 220 caused by the swinging and other movements of the power transmission tower 230 can be alleviated, and damage to the electric wire 220 can be reduced.

  In the above, the case where the insulating arm 206 is attached to the support 232 so as to be swingable in the line direction of the electric wire 220 has been described. However, the present invention is not limited to this. The insulating arm 206 may be movably attached to the support 232 in the line direction of the electric wire 220 via a slide mechanism or the like in addition to the swing mechanism as described above. Since the insulating arm 206 is movably attached to the support 232 in the line direction of the electric wire 220, the stress concentration on the electric wire 220 can be eased and the damage received by the electric wire 220 can be reduced in the same manner as described above. it can.

  A GNSS antenna 208 is attached to the yoke 282. The attachment position of the GNSS antenna 208 is not limited to the yoke 282 in the insulating arm 206, and may be another position in the insulating arm 206 or the line length adjusting device 202. However, the attachment position of the GNSS antenna 208 is preferably a position as close as possible to the support position of the electric wire 220 in the line length adjusting device 202 or a position adjacent to the support position of the electric wire 220.

  The control device 204 controls the line length adjusting device 202 described above based on the position information regarding the support position of the electric wire 220 in the power transmission tower 230. As illustrated in FIG. 8, the control device 204 includes a CPU (Central Processing Unit) 302, a ROM (Read Only Memory) 304, a RAM (Random Access Memory) 306, and a storage device 308. The line length adjusting device 202 includes a GNSS module 310, a communication module 312, and an I / F (Interface) 314. The CPU 302, ROM 304, RAM 306, storage device 308, communication module 312, GNSS module 310 and I / F 314 are connected to a common bus 316. A line length adjusting device 202 is communicably connected to the I / F 314. A GNSS antenna 208 is connected to the GNSS module 310. Note that power is supplied to the control device 204 by a power supply device (not shown) such as a solar cell or a battery.

  The CPU 302 operates according to a program stored in the ROM 304, the storage device 308, and the like, and functions as a control unit that controls the operation of the entire line length adjusting device 202. The RAM 306 provides a memory area necessary for the operation of the CPU 302.

  The GNSS module 310 measures the support position of the electric wire 220 in the power transmission tower 230 based on the GNSS signal received from the plurality of GNSS satellites 272 by the GNSS antenna 208. Further, the GNSS module 310 outputs wire support position information that is position information regarding the support position of the measured electric wire 220. Note that the GNSS antenna 208 is attached in the vicinity of the support position where the line length adjusting device 202 supports the electric wire 220 in the power transmission tower 230 as described above. 220 support positions.

  The communication module 312 enables communication with the control device 204 in the adjacent power transmission tower 230 or other power transmission tower 230 or the management device (not shown) of the management facility on land by a wireless or wired system.

  The CPU 302 notifies the control device 204 in the adjacent power transmission tower 230 and other power transmission towers 230 and the management device of the management facility on land via the communication module 312 about the wire support position information of the electric wires 220 in the power transmission tower 230. It has become. The management facility management apparatus can collect the electric wire support position information notified from the plurality of power transmission towers 230, create a database, and notify the control apparatus 204 of each power transmission tower 230.

  Further, the CPU 302 receives the wire support position information notified from the control device 204 in the adjacent power transmission tower 230 or other power transmission tower 230 via the communication module 312. In addition, the CPU 302 receives the wire support position information notified from the management facility management device via the communication module 312.

  Further, the CPU 302 determines the span length between the power transmission tower 230 and the power transmission tower 230 adjacent thereto based on the wire support position information in the power transmission tower 230 and the power support position information in the adjacent power transmission tower 230. Calculate and get. The wire support position information in the adjacent power transmission tower 230 is notified directly from the control device 204 in the adjacent power transmission tower 230 or from the management device of the management facility.

  Based on the acquired span length, the CPU 302 calculates and acquires a necessary wire length, which is the length of the wire 220 necessary between the power transmission tower 230 and the power transmission tower 230 adjacent thereto. The required wire length is a predetermined length obtained by adding a wire length for obtaining a predetermined slackness to the span length. The necessary wire length corresponding to the span length may be stored in the storage device 308 or the like in advance in a database. In this case, the CPU 302 refers to the necessary wire length database to obtain the necessary wire length corresponding to the span length.

  Further, the CPU 302 controls the rotation of the gold wheels 262a and 262b so that the length of the electric wire 220 between the power transmission tower 230 and the power transmission tower 230 adjacent to the power transmission tower 230 becomes a necessary electric wire length. The CPU 302 controls the rotation of the gold wheels 262a and 262b, thereby winding the electric wire 220 around the gold wheels 262a and 262b by a predetermined length or sending the electric wire 220 from the gold wheels 262a and 262b by a predetermined length. The length of the electric wire 220 wound around the gold wheels 262a and 262b is a length that cancels an increase from the required electric wire length of the length of the electric wire 220 between the power transmission tower 230 and the power transmission tower 230 adjacent thereto. Moreover, the length of the electric wire 220 sent out from the gold wheels 262a and 262b is a length that cancels the decrease from the required electric wire length of the length of the electric wire 220 between the power transmission tower 230 and the power transmission tower 230 adjacent thereto. .

  As described above, the CPU 302 adjusts the length of the electric wire 220 between the power transmission tower 230 and the power transmission tower 230 adjacent to the power transmission tower 230 to the required electric wire length. 262b is controlled. When adjusting the length of the electric wire 220 between the power transmission tower 230 and the younger-numbered power transmission tower 230 adjacent thereto, the CPU 302 controls the rotation of the young-numbered gold wheel 262a. When adjusting the length of the electric wire 220 between the power transmission tower 230 and the old number side power transmission tower 230 adjacent to the power transmission tower 230, the CPU 302 controls the rotation of the old number side gold wheel 262b. CPU302 can perform adjustment of the length of the electric wire 220 by control of the gold wheels 262a and 262b regularly, irregularly, or substantially in real time.

  Thus, the power transmission tower 230 according to the present embodiment is configured.

  When a power transmission tower is configured using a TLP type structure, it is possible to reduce the oscillation of the power transmission tower, but there is still an effect on the electric wire and the power transmission tower itself due to the fluctuation of the power transmission tower due to waves and winds. sell. For example, due to the oscillation of the power transmission tower due to waves or wind, there is a risk that the sag changes and the wire 220 whose tension balance is lost will be damaged, or the power support section of the power transmission tower may be damaged. . Compared to a steel tower that is fixed on land and does not move, a TLP-type power transmission tower is expected to move, for example, several meters by waves and wind, and the electric wires supported by it will be dynamic. Even in such a case, it is necessary to maintain the insulation and isolation of the electric wire and to maintain the electric wire at a certain slackness.

  On the other hand, in this embodiment, the length of the electric wire 220 between the power transmission towers 230 is adjusted by the line length adjusting device 202 as described above. For this reason, in this embodiment, the length of the electric wire 220 between the power transmission towers 230 can be maintained at an appropriate length, and the electric wire 220 is maintained at a constant slackness while maintaining the insulation isolation of the electric wire 220. be able to. Therefore, according to this embodiment, the influence with respect to the electric wire 220 and power transmission tower 230 itself resulting from rocking | fluctuation of the power transmission tower 230 by a wave or a wind can be suppressed.

  In the present embodiment, since the insulating arm 206 is swingably attached as described above, in combination with the swinging of the insulating arm 206 and the adjustment of the length of the electric wire 220 by the wire length adjusting device 202. The balance of tension in the electric wire 220 can be more reliably maintained.

  Next, the installation method of the aerial overhead power transmission system 200 according to the present embodiment will be further described with reference to FIGS. 9 and 10 are schematic diagrams illustrating a method for installing the aerial overhead power transmission system 200 according to the present embodiment. 9 and 10 show a case where the single-wire electric wire 220 is supported for the sake of simplicity, the present invention is not limited to this. A plurality of wires 220 such as a wire 220 constituting a three-phase three-wire two-line power transmission line can be similarly supported.

  A waterborne overhead power transmission system 200 to be installed includes a plurality of power transmission towers 230 for supporting electric wires 220 on the sea. Further, as described above, the plurality of power transmission towers 230 are each composed of the support 232, the buoyancy tank 234, the tendon 236, the floating gravity anchor 238 having the anchor 240 and the floating tank 242, the line length adjusting device 202, A control device 204 and the like are included.

  On the land, an electric wire drum 320 is installed to send out and supply the electric wire 220 to be transmitted to the power transmission tower 230 to be installed. Similar to the first embodiment, the buoyancy tank 234 and the floating gravity anchor 238 of the power transmission tower 230 are floated on the ocean in a state having stability.

  Next, one end of the electric wire 220 sent out from the electric wire drum 320 is fixed and wound around the gold wheel 262 a in the wire length adjusting device 202 of the offshore power transmission tower 230. Thus, the electric wire 220 is supported on the support body 232 of the power transmission tower 230 via the line length adjusting device 202.

  Next, as shown in FIG. 9A, while the electric wire 220 is being sent out from the electric wire drum 320, the tow ship 260 directs the buoyancy tank 234 and the floating gravity anchor 238 of the power transmission tower 230 that supports the electric wire 220 to the installation location. Towing. At this time, the buoyancy tank 234 and the floating gravity anchor 238 of the power transmission tower 230 are in a state of being floated on the ocean and having stability.

  Next, when the wire 220 having the required wire length which is a required length between the power transmission towers 230 is sent out from the wire drum 320, the towing of the buoyancy tank 234 of the power transmission tower 230 and the sinking gravity anchor 238 by the towing vessel 260 is temporarily performed. To stop. Subsequently, as in the first embodiment, the buoyancy tank 234 and the floating gravity anchor 238 of the next young transmission tower 230 are floated on the ocean in a state having stability. As described above, the plurality of power transmission towers 230 are numbered, with the land side being the younger number side and the ocean side being the older number side.

  Next, as shown in FIG. 9B, the electric wire 220 fed out from the electric wire drum 320 is cut at a position Ps where the necessary electric wire length is a necessary length between adjacent power transmission towers 230. The position Ps indicates the support position of the electric wire 220 supported by the corresponding power transmission tower 230. The position Ps in the electric wire 220 can be marked in advance on the electric wire 220 sent out from the electric wire drum 320. Since the position Ps is marked on the electric wire 220 in advance, the installation work can be efficiently performed.

  Subsequently, as shown in FIG. 9 (b), one cut end of the cut electric wire 220 on the electric wire drum 320 side is fixed to the gold wheel 262a in the line length adjusting device 202 of the young power transmission tower 230. Wrap it. Further, the other cut end of the cut electric wire 220 is fixed and wound around the gold wheel 262b in the wire length adjusting device 202 of the young power transmission tower 230. In this way, the electric wire 220 is supported on the support body 232 of the young power transmission tower 230 via the line length adjusting device 202 at the position Ps marked in advance. Since the electric wire 220 is supported by the power transmission tower 230 at the position Ps marked in advance as described above, the electric wires 220 between the power transmission towers 230 that have reached the final installation location have a predetermined degree of sag. For this reason, in this embodiment, the operation | work of the slackness adjustment of the electric wire 220 becomes unnecessary, and the labor saving of installation work is realizable.

  Next, as shown in FIG. 9C, the buoyancy tank 234 and the rise and fall of each of the old and young transmission towers 230 that support the electric wire 220 by the tow ship 260 while feeding the electric wire 220 from the electric wire drum 320. Tow the type gravity anchor 238 toward the installation location. At this time, the buoyancy tank 234 and the floating gravity anchor 238 of each power transmission tower 230 are in a state of being floated on the ocean and having stability.

  Next, when the electric wire 220 having a required length is sent out from the electric wire drum 320 between the power transmission towers 230, the towing of the buoyancy tank 234 and the floating gravity anchor 238 of each power transmission tower 230 by the tow ship 260 is temporarily stopped again. .

  Thereafter, for each of the remaining power transmission towers 230, the work process shown in FIG. 9B for supporting the electric wires 220 on the power transmission tower 230, the buoyancy tank 234 of the power transmission tower 230 that supports the electric wires 220, and the float and sink type gravity anchor 238. The operation process shown in FIG. Accordingly, the work process shown in FIG. 9B and the work process shown in FIG. 9C are sequentially repeated for each of the plurality of power transmission towers 230. Thus, as shown in FIG. 10A, the electric wires 220 are bridged over the plurality of power transmission towers 230 to be installed, and the plurality of power transmission towers 230 are towed to the installation location.

  Next, as shown in FIG. 10 (b), the gold wheel 262 b in the line length adjusting device 202 of the oldest transmission tower 230 among the plurality of transmission towers 230 and the electrical equipment of the offshore structure 10 Connection is made with an electric wire 220. Further, the electric wire 220 having one end fixed to the gold wheel 262a in the wire length adjusting device 202 of the youngest power transmission tower 230 among the plurality of power transmission towers 230 is supported by the steel tower 322 installed on land.

  Next, as in the first embodiment, each of the plurality of power transmission towers 230 is poured into the float / sink tank 242 of the float / sink type gravity anchor 238 to sink the float / sink type gravity anchor 238 to the bottom of the water (sea floor). As shown in FIG. 10C, the buoyancy tank 234 in each power transmission tower 230 is drawn into the water by the float / sink type gravity anchor 238 through the tendon 236. The buoyancy tank 234 in each power transmission tower 230 is moored to a predetermined depth corresponding to the length of the tendon 236 in a state where the tendon 236 is in tension due to the buoyancy of the buoyancy tank 234 and the gravity of the float-and-sink type gravity anchor 238. The

  In addition, the order of the work process shown in FIG.10 (b) and the work process shown in FIG.10 (c) is not limited to the case mentioned above. That is, before the work process shown in FIG. 10B, for each of the plurality of power transmission towers 230, water may be poured into the float / sink tank 242 to cause the float / sink type gravity anchor 238 to sink to the bottom of the water (sea floor).

  Thus, the aerial overhead power transmission system 200 according to the present embodiment is installed.

  Note that the aerial overhead power transmission system 200 according to the present embodiment can also be installed by other installation methods. Hereinafter, an installation method of the aerial overhead power transmission system 200 according to a modification of the present embodiment will be described with reference to FIGS. 11 and 12. FIG.11 and FIG.12 is schematic which shows the installation method of the surface overhead power transmission system 200 by the modification of this embodiment. 11 and 12 also show a case where a single wire 220 is supported for the sake of simplicity, but the present invention is not limited to this. A plurality of wires 220 such as a wire 220 constituting a three-phase three-wire two-line power transmission line can be similarly supported.

  Similarly to the above, also in this modification, the aerial overhead power transmission system 200 to be installed includes a plurality of power transmission towers 230 for supporting the electric wires 220 on the sea. In addition, the plurality of power transmission towers 230 are, as described above, the support body 232, the buoyancy tank 234, the tendon 236, the floating gravity anchor 238 having the anchor 240 and the floating tank 242, the line length adjusting device 202, and the control. A device 204 or the like.

  First, the buoyancy tanks 234 and the ups and downs gravity anchors 238 of all the plurality of power transmission towers 230 to be installed are towed to installation locations on the ocean, respectively. At this time, the buoyancy tank 234 and the floating gravity anchor 238 of each power transmission tower 230 are in a state of being floated on the ocean and having stability. Unlike the method shown in FIGS. 9 and 10, in this modification, the power transmission tower 230 is towed in a state where the electric wires 220 are not supported, so that the load load during towing can be reduced. In addition, when towing with the electric wire 220 supported by the power transmission tower 230, a bending load on the electric wire 220 may be generated in the vicinity of the support position of the electric wire 220. In this modification, the generation of such a bending load on the electric wire 220 can be avoided.

  In parallel with the towing of the power transmission tower 230, the electric wires 220 are sent out from the electric wire drum 320, and the electric wires 220 having a required length are laid on the sea surface along the plurality of power transmission towers 230 on the ocean. Fig.11 (a) has shown the figure which looked at the state which laid the electric wire 220 on the sea surface from the top. FIG.11 (b) has shown the figure which looked at the state which laid the electric wire 220 on the sea surface from the side.

  Next, as shown in FIG. 12A, the electric wire 220 laid on the sea surface is cut at a plurality of positions Ps indicating the required electric wire length that is a necessary length between adjacent power transmission towers 230. Each position Ps indicates a support position of the electric wire 220 supported by the corresponding power transmission tower 230. Each position Ps can be marked in advance on the electric wire 220 delivered from the electric wire drum 320. Since each position Ps is marked on the electric wire 220 in advance, the installation work can be efficiently performed.

  Subsequently, similarly as shown in FIG. 12A, for the cut portion of the electric wire 220 at each position Ps, one cut end on the electric wire drum 320 side of the cut electric wire 220 is connected to the line length of the corresponding power transmission tower 230. The adjustment device 202 is fixedly wound around the gold wheel 262a. Moreover, the other cut end of the cut electric wire 220 is fixed and wound around the gold wheel 262b in the line length adjusting device 202 of the corresponding power transmission tower 230. In this way, the electric wires 220 laid on the ocean are supported on the respective supports 232 of the plurality of power transmission towers 230 at the respective pre-marked positions Ps corresponding to the plurality of power transmission towers 230. Also in this modification, since the electric wire 220 is supported on the power transmission tower 230 at the position Ps marked in advance as described above, the work of adjusting the slackness of the electric wire 220 is not required, and the labor saving of the installation work can be realized. . Further, in this modification, the work for supporting the electric wire 220 is performed after the power transmission tower 230 is towed to the installation place, so that the installation work such as a retaining device around the power transmission tower 230 is facilitated.

  Thus, as shown in FIG. 12B, the electric wires 220 are bridged over the plurality of power transmission towers 230 to be installed.

  Next, in the same manner as the work process shown in FIG. 10B, the gold wheel 262 b in the line length adjusting device 202 of the oldest transmission tower 230 among the plurality of transmission towers 230 and the offshore structure 10. The electrical equipment is connected by an electric wire 220. Further, the electric wire 220 having one end fixed to the gold wheel 262a in the wire length adjusting device 202 of the youngest power transmission tower 230 among the plurality of power transmission towers 230 is supported by the steel tower 322 installed on land.

  Next, in the same manner as in the work process shown in FIG. 10 (c), each of the plurality of power transmission towers 230 is poured into the float / sink tank 242 of the float / sink type gravity anchor 238 in the same manner as in the first embodiment. The gravity anchor 238 is sunk to the bottom of the water (the bottom of the sea).

  Thus, the aerial overhead power transmission system 200 is installed by the installation method according to this modification. In this modified example, in addition to the above-described work process sequence, before and after the work process shown in FIG. Water may be poured into 242 and the floating gravity anchor 238 may sink to the bottom of the water (the sea floor).

  9 and 10 and the installation method shown in FIGS. 11 and 12, the electric wire 220 is supported on the support 232 of the power transmission tower 230 via the line length adjusting device 202. Although described, the present invention is not limited to this. Even when the insulator 232 is supported on the support 232 of the power transmission tower 230 without using the line length adjusting device 202 as appropriate, the surface overhead power transmission system can be installed in the same manner as the above installation method.

[Third Embodiment]
A waterborne overhead power transmission system according to a third embodiment of the present invention will be described with reference to FIG. The same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  The basic configuration of the waterborne overhead power transmission system according to this embodiment is substantially the same as that of the waterborne overhead power transmission system 200 according to the second embodiment. The aerial overhead power transmission system according to the present embodiment is different from the aerial overhead power transmission system 200 according to the second embodiment in that the gold wheels 262a and 262b in the line length adjusting device 402 are accommodated in the anticorrosive tanks 404a and 404b, respectively. Is different.

  Hereinafter, the configuration of the line length adjusting apparatus 402 according to the present embodiment will be described with reference to FIG. FIG. 13 is a diagram illustrating a schematic configuration of the line length adjusting device 402 according to the present embodiment. FIG. 13A is a side view and FIG. 13B is a top view.

  As shown in FIGS. 13A and 13B, the line length adjusting device 402 according to this embodiment is a line length adjusting device 202 according to the second embodiment shown in FIGS. 6A and 6B. In addition to the same configuration as the above, it further has anticorrosive tanks 404a and 404b.

  Anticorrosive agent tank 404a, 404b is a container which has a ceiling part, a side wall part, and a baseplate part. The anticorrosive tanks 404a and 404b are filled with an anticorrosive 406 for preventing corrosion of the electric wire 220, respectively. The anticorrosion agent 406 is not particularly limited as long as it has an anticorrosion performance for preventing the corrosion of the electric wire 220. For example, the anticorrosion agent 406 is grease and is in the form of a liquid or a paste having viscosity.

  In the anticorrosive agent tanks 404a and 404b filled with the anticorrosive agent 406, gold wheels 262a and 262b are accommodated, respectively. The gold wheels 262a and 262b around which the electric wire 220 is wound are buried or immersed in the anticorrosive agent 406 in the anticorrosive agent tanks 404a and 404b, respectively.

  The lower frames 264a and 264b penetrate the ceiling portions of the anticorrosive tanks 404a and 404b, respectively, and can rotate the gold wheels 262a and 262b in the anticorrosive tanks 404a and 404b as in the second embodiment. I support it. Further, the connecting frame 266 passes through the side walls of the anticorrosive tanks 404a and 404b, and is installed between the lower frames 264a and 264b in the anticorrosive tanks 404a and 404b, as in the second embodiment.

  The electric wires 220 wound around the gold wheels 262a and 262b pass through openings 408a and 408b provided on the side walls of the anticorrosive tanks 404a and 404b, respectively, and are taken out of the anticorrosive tanks 404a and 404b to be adjacent to each other. Over the tower 230. The electric wire 220 is wound around the gold wheels 262a and 26b through the openings 408a and 408b, and is sent out from the gold wheels 262a and 26b.

  Thus, the line length adjusting device 402 according to the present embodiment is configured.

  The electric wire 220 wound around the gold wheels 262a and 262b is in a state of moving while being in contact with the outer peripheral surface of the gold wheels 262a and 262b during the operation of adjusting the length of the electric wire 220. For this reason, when the anticorrosive agent tanks 404a and 404b are not provided and the anticorrosive agent is simply applied to the electric wire 220, the anticorrosive agent may be consumed and the anticorrosion function may be deteriorated. Maintenance work, such as applying an anticorrosive agent, is necessary.

  On the other hand, in this embodiment, the gold wheels 262a and 262b around which the electric wire 220 is wound are buried or immersed in the anticorrosive agent 406 in the anticorrosive agent tanks 404a and 404b, respectively. For this reason, in this embodiment, sufficient anticorrosive agent can be supplied to the electric wire 220 from the anticorrosive agent 406 in the anticorrosive agent tanks 404a and 404b. Therefore, according to this embodiment, consumption of the anticorrosive agent in the electric wire 220 can be suppressed, and the frequency of maintenance work related to the anticorrosive agent can be reduced.

  Furthermore, in this embodiment, the material properties such as the viscosity of the anticorrosive agent 406 are adjusted, and the sizes, shapes, positions, etc. of the openings 408a and 408b through which the electric wires 220 of the anticorrosive agent tanks 404a and 404b pass are adjusted. can do. Thereby, the adhesion amount of the anticorrosive agent adhering to the electric wire 220 when the electric wire 220 is fed out can be made equal to the adhesion amount of the anticorrosive agent adhering to the electric wire 220 when the electric wire 220 is wound. Thereby, it is not necessary to add and replenish the anticorrosive agent in the anticorrosive agent tanks 404a and 404b, and maintenance-free for the anticorrosive agent can be realized.

  Thus, according to the present embodiment, the anticorrosive agent tanks 404a and 404b can sufficiently supply the anticorrosive agent to the electric wires 220 that contact the gold wheels 262a and 262b, and the frequency of maintenance work is reduced with respect to the anticorrosive agent. be able to. Furthermore, maintenance-free can also be realized for the anticorrosive agent.

[Fourth Embodiment]
A floating overhead power transmission system according to a fourth embodiment of the present invention will be described with reference to FIGS. 14 and 15. In addition, the same code | symbol is attached | subjected about the component similar to the said 1st thru | or 3rd embodiment, description is abbreviate | omitted or simplified.

  The basic configuration of the waterborne overhead power transmission system according to this embodiment is substantially the same as that of the waterborne overhead power transmission system 200 according to the second embodiment. The aerial overhead power transmission system 200 according to the second embodiment has a line length adjusting device 502 that adjusts the length of the electric wire 220 by the dancer roller 506 instead of the wire length adjusting device 402. Is different.

  Hereinafter, the configuration of the line length adjusting apparatus 502 according to the present embodiment will be described with reference to FIG. FIG. 14 is a diagram illustrating a schematic configuration of the line length adjusting device 502 according to the present embodiment.

  As shown in FIG. 14, the line length adjusting device 502 according to the present embodiment includes a pair of guide rollers 504 a and 504 b, a dancer roller 506, a linear actuator 508, and a main body frame 510.

  The guide rollers 504 a and 504 b are each a rotating body that can rotate around the rotation axis, and guide the electric wire 220 to the dancer roller 506. Unlike the gold wheels 262a and 262b, the guide rollers 504a and 504b are configured to freely rotate forward and backward without a rotation motor. Further, unlike the gold wheels 262a and 262b, the guide rollers 504a and 504b are not necessarily made of a metal or other conductive material.

  The guide rollers 504a and 504b are rotatably supported by the main body frame 510 such that the rotation shafts are horizontal and the rotation shafts are arranged in parallel to each other. The guide rollers 504a and 504b are arranged so as to be lined up along the line direction of the electric wire 220 laid over the adjacent power transmission tower 230.

  A linear actuator 508 is attached to the main body frame 510 below the guide rollers 504a and 504b. A dancer roller 506 is attached to the linear motion actuator 508.

  The dancer roller 506 is disposed at a position lower than the guide rollers 504a and 504b. The dancer roller 506 is a dancer that moves up and down by a linear actuator 508. The dancer roller 506 is a rotating body that can rotate around the rotation axis. The dancer roller 506 is arranged so that its rotational axis is parallel to the rotational axes of the guide rollers 504a and 504b.

  The linear motion actuator 508 is configured to move the dancer roller 506 up and down in a range lower than the guide rollers 504a and 504b. The operation of the linear actuator 508 is controlled by the control device 204.

  The line length adjusting device 502 is suspended and supported by the insulating arm 206 at the upper part of the main body frame 510 as in the first embodiment.

  On the guide roller 504a, an electric wire 220 is hung on the young power transmission tower 230. The electric wire 220 hung on the guide roller 504a is hung on the dancer roller 506. The electric wire 220 hung on the dancer roller 506 is hung on the guide roller 504b. The electric wire 220 hung on the guide roller 504b is stretched over the old power transmission tower 230. Thus, in this embodiment, the single wire 220 is stretched over the guide rollers 504 a and 504 b and the dancer roller 506 and supported by the line length adjusting device 502.

  In this way, in the wire length adjusting device 502, the electric wire 220 is sequentially wound around the guide roller 504a, the dancer roller 506, and the guide roller 504b. Thereby, the electric wire 220 is supported by the line length adjusting device 502 in the power transmission tower 230.

  Unlike the wire length adjusting devices 202 and 402 according to the second and third embodiments, the wire length adjusting device 502 according to the present embodiment can support the electric wire 220 without cutting. Accordingly, the wire length adjusting device 502 according to the present embodiment supports a linear body such as a cable including only an optical fiber core wire, a composite cable of a power source fiber and an optical fiber core wire, for example, instead of the electric wire 220. You can also.

  The line length adjusting device 502 adjusts the length of the electric wire between the power transmission tower 230 and the power transmission tower 230 adjacent thereto by moving the dancer roller 506 up and down. That is, the wire length adjusting device 502 draws the electric wire 220 between the guide rollers 504a and 504b and the dancer roller 506, or sends out the electric wire 220 from between the guide rollers 504a and 504b and the dancer roller 506, so that the length of the electric wire 220 is increased. Adjust.

  In the present embodiment, unlike the second embodiment, the CPU 302 of the control device 204 controls the vertical movement of the dancer roller 506 by controlling the linear motion actuator 508. Thereby, CPU302 adjusts the length of the electric wire 220 between the power transmission towers 230. FIG.

  In the present embodiment, the CPU 302 calculates and obtains the necessary wire length, which is the length of the wire 220 necessary between the power transmission tower 230 and the power transmission tower 230 adjacent thereto, in the same manner as in the first embodiment. To do.

  The CPU 302 controls the up and down movement of the dancer roller 506 so that the length of the electric wire 220 between the power transmission tower 230 and the power transmission tower 230 adjacent to the power transmission tower 230 becomes a necessary electric wire length. As a result, the CPU 302 pulls the electric wire 220 between the guide rollers 504a and 504b and the dancer roller 506, or sends out the electric wire 220 from between the guide rollers 504a and 504b and the dancer roller 506. The length of the electric wire 220 drawn between the guide rollers 504a and 504b and the dancer roller 506 cancels the increase from the required electric wire length of the electric wire 220 between the power transmission tower 230 and the power transmission tower 230 adjacent thereto. Length. Further, the length of the electric wire 220 sent out between the guide rollers 504a and 504b and the dancer roller 506 is reduced from the required electric wire length of the electric wire 220 between the power transmission tower 230 and the power transmission tower 230 adjacent thereto. Is the length to cancel.

  As described above, the CPU 302 controls the dancer roller 506 of the line length adjusting device 202 so as to adjust the length of the electric wire 220 between the power transmission tower 230 and the power transmission tower 230 adjacent thereto to the required electric wire length. To do. The CPU 302 can execute the adjustment of the length of the electric wire 220 under the control of the dancer roller 506 regularly, irregularly, or in substantially real time.

  In addition, the aerial overhead power transmission system 200 according to the present embodiment using the above-described line length adjusting device 502 is the same as the aerial overhead power transmission system 200 according to the second embodiment except that the wire 220 is supported by the wire length adjusting device 502 without cutting. It can be installed by the same installation method. In the case of the line length adjusting device 502, the wire 220 may be supported on the line length adjusting device 502 by laying a single wire 220 around the guide rollers 504a and 504b and the dancer roller 506.

  In the wire length adjusting device 502 according to the present embodiment, the guide rollers 504a and 504b are used as the anticorrosive agent tank in the same manner as the gold wheels 262a and 262b are accommodated in the anticorrosive agent tanks 404a and 404b in the third embodiment. It can also be accommodated.

  FIG. 15 is a diagram illustrating a schematic configuration when the guide rollers 504a and 504b are accommodated in the anticorrosive tanks 512a and 512b, respectively, in the line length adjusting device 502 according to the present embodiment.

  In this case, as shown in FIG. 15, the line length adjusting device 502 further includes anticorrosive tanks 512a and 512b in addition to the configuration shown in FIG.

  The anticorrosive agent tanks 512a and 512b are filled with an anticorrosive agent 406 as in the third embodiment.

  Guide rollers 504a and 504b are accommodated in the anticorrosive agent tanks 512a and 512b filled with the anticorrosive agent 406, respectively. The guide rollers 504a and 504b around which the electric wire 220 is hung are buried or immersed in the anticorrosive agent 406 in the anticorrosive agent tanks 404a and 404b, respectively.

  The electric wires 220 hung on the guide rollers 504a and 504b pass through the openings 514a and 514b provided on the side walls of the anticorrosive tanks 512a and 512b, respectively, and are taken out of the anticorrosive tanks 512a and 512b. Over the tower 230.

  The electric wires 220 hung on the guide rollers 504a and 504b pass through openings 516a and 516b provided at the bottoms of the anticorrosive tanks 512a and 512b, respectively, and are taken out of the anticorrosive tanks 512a and 512b. It is hung on. Sealing mechanisms (not shown) for preventing leakage of the anticorrosive agent 406 from the anticorrosive agent tanks 512a and 512b are provided in the openings 516a and 516b, respectively.

  Also in this embodiment, sufficient anticorrosive agent can be supplied to the electric wire 220 from the anticorrosive agent 406 in the anticorrosive agent tanks 512a and 512b. Therefore, according to this embodiment, consumption of the anticorrosive agent in the electric wire 220 can be suppressed, and the frequency of maintenance work related to the anticorrosive agent can be reduced.

  Also in this embodiment, the size, shape, and position of the openings 514a, 514b, 516a, 516b through which the wire 220 of the anticorrosive agent tanks 512a, 512b passes are adjusted or the material properties such as the viscosity of the anticorrosive agent 406 are adjusted. Etc. can be adjusted. Thereby, the adhesion amount of the anticorrosive agent adhering to the electric wire 220 when the electric wire 220 is sent out can be made equal to the adhesion amount of the anticorrosive agent adhering to the electric wire 220 when the electric wire 220 is drawn. Thereby, it is not necessary to add and replenish the anticorrosive agent in the anticorrosive agent tanks 512a and 512b, and maintenance-free for the anticorrosive agent can be realized.

[Fifth Embodiment]
A floating overhead power transmission system according to a fifth embodiment of the present invention will be described with reference to FIGS. 16 to 24. 16 to 24 are schematic diagrams illustrating a method for installing a power transmission tower according to the present embodiment. The same components as those in the first to fourth embodiments are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  In the present embodiment, the method for installing the power transmission tower 30 according to the first embodiment will be described more specifically, specifically, towing of the power transmission tower 30 and settlement of the float-sink type gravity anchor 38. The power transmission tower 230 according to the second to fifth embodiments can also be installed in the same manner as in this embodiment.

  FIG. 16 shows the power transmission tower 30 towed by tow boats (tug boats) 60a and 60b, FIG. 16 (a) is a side view, and FIG. 16 (b) is a top view. As shown in FIG. 16, the tow ship 60a and the buoyancy tank 34 are connected by a control wire 62a. The towed ship 60b and the floating gravity anchor 38 are connected by a control wire 62b. The buoyancy tank 34 and the ups and downs type gravity anchor 38 are connected by a tendon 36 via a suspension reel 66 and a take-up reel 68 shown in FIG.

  Further, the buoyancy tank 34 and the ups and downs type gravity anchor 38 are connected by a wire 64. The wire 64 is shorter than the tendon 36 between the buoyancy tank 34 and the sinking gravity anchor 38. In this way, towing the buoyancy tank 34 and the float-and-sink type gravity anchor 38 of the power transmission tower 30 in a state where the buoyancy tank 34 and the float-and-sink type gravity anchor 38 are connected by the wire 64 shorter than the tendon 36, the slack of the tendon 36 is always kept. Can be secured. Thereby, it is possible to prevent an excessive force from being applied to the connection portion between the floating and sinking-type gravity anchor 38 and the tendon 36. Thus, the wire 64 can prevent the tendon 36 from being bent with a small curvature in the vicinity of the connecting portion, thereby reducing damage to the tendon 36. Note that the wire 64 may be connected to the anchor 40 of the floating gravity anchor 38 or may be connected to the floating tank 42.

  Further, when towing the buoyancy tank 34 and the floating gravity anchor 38 of the power transmission tower 30, the anchor 40 and the floating tank 42 can be turned upside down as compared with the case shown in FIG. That is, as shown in FIG. 16 (a), in the state where the anchor 40 is positioned on the ups and downs tank 42, in other words, the ups and downs tank 42 is on the sea bottom side and the anchor 40 is on the sea side, The buoyancy tank 34 and the sinking gravity anchor 38 can be towed.

  When towing in a state where the floating tank 42 is located on the anchor 40, the tendon 36 connected from the floating tank 42 side to the floating gravity anchor 38 comes out upward on the water. When the tendon 36 exits upward toward the water, the tendon 36 that exits toward the water is bent to the underwater side with a small curvature due to its own weight. As a result, when the tendon 36 is towed through the transmission tower 30, A large stress is applied to the connecting portion.

  On the other hand, when the power transmission tower 30 is towed in a state where the anchor 40 is positioned on the floating tank 42 as shown in FIG. The tendon 36 connected from the side of the tank 42 goes downward toward the water. For this reason, the tendon 36 is not bent by its own weight, and the curvature of the tendon 36 in the vicinity of the connection portion with the floating and sinking-type gravity anchor 38 can be increased. Thereby, when towing the buoyancy tank 34 and the floating gravity anchor 38 of the power transmission tower 30, it is possible to reduce the stress applied to the connecting portion between the floating gravity anchor 38 and the tendon 36. Therefore, in this case, damage to the tendon 36 due to stress can be reduced. As will be described later, the vertical positions of the floating tank 42 and the anchor 40 are switched while the floating gravity anchor 38 is submerged in the seabed. Thus, the floating gravity anchor 38 is set on the seabed by sinking in the sea with the floating tank 42 positioned on the anchor 40.

  In the state shown in FIG. 16, the buoyancy tank 34 and the ups and downs-type gravity anchor 38 of the power transmission tower 30 are towed to the installation site offshore by the towed ships 60a and 60b with the buoyancy tank 34 in front.

  FIG. 17 to FIG. 24 show the state from towing the buoyancy tank 34 and the float / sink type gravity anchor 38 of the power transmission tower 30 until the power transmission tower 30 is installed, and side views corresponding to FIG. 16 (a), respectively. It is. FIG. 17 shows an initial state before the buoyancy tank 34 and the floating gravity anchor 38 are towed and the sinking of the floating gravity anchor 38 is started. FIG. 18 to FIG. 24 show the state in which the floating gravity anchor 38 sinks step by step. In FIGS. 17 to 22, only one tendon 36 is shown for simplicity.

  As shown in FIG. 17, the support 32 is provided with a suspension reel 66 for hanging the tendon 36 and a take-up reel 68 for winding the tendon 36. The take-up reel 68 is configured to take up the tendon 36 suspended from the suspension reel 66 on the side of the floating gravity anchor 38. The take-up reel 68 uses a swivel joint on the rotating shaft. Due to the swivel joint, the take-up reel 68 winds up the tendon 36 between the take-up reel 68 and the up-and-down gravitational anchor 38, while the tendon between the take-up reel 68, the suspension reel 66 and the take-up reel 68. It is configured not to wind up. Note that the take-up reel 68 is not necessarily provided. For example, the tendon 36 may be wound into a figure 8 winding on the support body 32 and the tendon 36 may be fed out from the figure-eight winding state. it can.

  The support 32 is provided with a winch 70. The winch 70 is connected to the other end of a wire 72 whose one end is connected to the floating gravity anchor 38. The winch 70 and the wire 72 are used when the floating gravity anchor 38 is lowered as will be described later.

  The support 32 may be provided with a pump for sending air to the float / sink tank 42 when the power transmission tower 30 is recovered. In this case, the pump and the tank 42 are connected by a hose.

  When towing the power transmission tower 30, the floating gravity anchor 38 and the buoyancy tank 34 are connected to the tendon 36 via a suspension reel 66 and a take-up reel 68 attached to the support 32. In addition, the floating type gravity anchor 38 is connected to the winch 70 through a wire 72. In such a state, the power transmission tower 30 is towed to the installation site on the ocean.

  Next, at the installation site, the wires 64 that connect the buoyancy tank 34 and the ups and downs gravity anchor 38 are removed from each. Moreover, the air release valve 74 provided in the floating tank 42 of the floating gravity anchor 38 is opened, and water is poured into the floating tank 42 so that the underwater weight of the floating gravity anchor 38 is slightly heavier than zero. Thereby, as shown in FIG. 18, the floating type gravity anchor 38 sinks into the sea. While sinking, the tendon 36 is fed out from the take-up reel 68 in accordance with the sinking speed while adjusting the position of the sinking gravity anchor 38 by the control wire 62b connecting the towed ship 60b and the sinking gravity anchor 38. As a result, the float / sink type gravity anchor 38 is slowly sunk. While the floating gravity anchor 38 sinks, the vertical positions of the floating tank 42 and the anchor 40 are switched. As a result, the floating type gravity anchor 38 sinks in a state where the floating tank 42 is positioned on the anchor 40. At this time, as shown in FIG. 19, the position of the ups and downs-type gravity anchor 38 is adjusted so as to be located directly below the buoyancy tank 34.

  Further, the floating gravity anchor 38 is lowered by the winch 70 and the control wire 62b until all the tendons 36 of the take-up reel 68 are drawn out. After that, as shown in FIG. 20, the tendon 36 is released from the take-up reel 68 so that the tendon 36 is supported only by the suspension reel 66.

  Next, as shown in FIG. 21, the control wire 62 b is detached from the floating gravity anchor 38. Next, as shown in FIG. 22, the tendon 36 is removed from the suspension reel 66, and the tendon 36 is lowered by the suspension wire 76. Along with this, as shown in FIG. 23, the winch 70 sinks the floating gravity anchor 38 until the buoyancy tank 34 supports the floating gravity anchor 38.

  Next, in a state where the buoyancy tank 34 supports the float / sink type gravity anchor 38, all the air in the float / sink tank 42 is removed, and the float / sink type gravity anchor 38 is settled on the seabed. Thus, the power transmission tower 30 is installed.

  As shown in FIG. 24, in the state in which the air of the float / sink tank 42 is evacuated until just before the float / sink type gravity anchor 38 reaches the bottom of the sea, a remotely operated unmanned explorer (ROV) 78 is used in the sea. You may want to monitor to find a place with good undersea conditions. In this case, the tow ships 60a and 60b connected to the support body 32 by the control wires 62c and 62d move the power transmission tower 30 to a place where the discovered seabed condition is good while avoiding unevenness of the seabed. Thereafter, the air in the float / sink tank 42 is completely exhausted, and the float / sink type gravity anchor 38 is settled on the seabed.

[Modified Embodiment]
The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the embodiment described above, the overhead power transmission system installed in the ocean area has been described as an example, but the installation location of the overhead power transmission system does not necessarily have to be the ocean area. For example, the present invention can be similarly applied to an overhead power transmission system in which a linear body is installed on the water of a lake or a river.

  The above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

DESCRIPTION OF SYMBOLS 10 ... Offshore structure 20 ... Linear body 30, 230 ... Power transmission tower 32, 232 ... Support body 34, 234 ... Buoyancy tank 36, 236 ... Tendon 38, 238 ... Floating gravity anchor 40, 240 ... Anchor 42, 242 ... Floating tanks 100, 200 ... Overwater power transmission systems 202, 402, 502 ... Line length adjusting device 204 ... Control device 206 ... Insulating arm 220 ... Electric wires 262a, 262b ... Gold wheels 404a, 404b, 512a, 512b ... Anticorrosive tank 406 ... Anti-corrosive agent 504a, 504b ... Guide roller 506 ... Dancer roller

Claims (23)

A waterborne overhead power transmission system including a power transmission tower provided on the water and a linear body supported by the power transmission tower,
The power transmission tower includes a buoyancy tank, a support body of the linear body provided in the buoyancy tank, and a gravitational anchor connected to the buoyancy tank via a tendon. A floating overhead power transmission system characterized by The gravity anchor includes an anchor having a weight for mooring the buoyancy tank provided with the support to the seabed, and a tank for floating and sinking that can float the anchor on the water. Item 1. An aerial overhead power transmission system according to item 1.   The said power transmission tower has a line length adjustment apparatus which adjusts the length of the said linear body, The aerial overhead power transmission system of Claim 1 or 2 characterized by the above-mentioned. The floating overhead power transmission system according to claim 3, further comprising a control device that controls the line length adjusting device based on position information related to a support position of the linear body in the power transmission tower. The control device controls the line length adjusting device so that a length of the linear body between the power transmission tower and a power transmission tower adjacent thereto is a predetermined length. Item 4. The aerial overhead power transmission system according to item 4. The line length adjusting device is:
A rotating body in which the linear body is fixed and wound, the rotating body being rotatable so as to wind or send out the linear body;
The length of the said linear body is adjusted by winding up the said linear body to the said rotary body, or sending out a linear body from the said rotary body. The any one of Claim 3 thru | or 5 characterized by the above-mentioned. The listed aerial power transmission system. The line length adjusting device is:
A set of the rotating bodies;
The floating overhead power transmission system according to claim 6, further comprising: an electrical connection portion that slides on the set of rotating bodies and electrically connects the set of rotating bodies to each other. The line length adjusting device is:
A dancer on which the linear body is hung,
A rotating body for guiding the linear body to the dancer;
The floating overhead power transmission system according to any one of claims 3 to 5, wherein the length of the linear body is adjusted by moving the dancer up and down. The line length adjusting device has an anticorrosive tank filled with an anticorrosive,
The floating electric power transmission system according to any one of claims 6 to 8, wherein the rotating body is accommodated in the anticorrosive agent tank. The floating overhead power transmission system according to any one of claims 3 to 9, wherein the line length adjusting device is supported by an insulating arm attached to the support. The aerial overhead power transmission system according to claim 10, wherein the insulating arm is movably attached to the support body in a line direction of the linear body. The support is made of fiber reinforced plastic;
The floating power transmission system according to any one of claims 1 to 11, wherein the power transmission tower includes a metal cap that covers a top of the support. The floating power transmission system according to any one of claims 1 to 12, wherein the power transmission tower includes a ground plate provided on a lower surface of the gravity anchor. The floating aerial power transmission system according to any one of claims 1 to 13, wherein the support body has a truss structure with a rod-shaped member. The floating overhead power transmission system according to claim 14, wherein the rod-shaped member is made of fiber reinforced plastic. A suspension reel provided on the support for suspending the tendon;
The aerial overhead power transmission system according to any one of claims 1 to 15, further comprising a take-up reel provided on the support and for taking up the tendon. A method of installing a power transmission tower for supporting a linear body on water,
Tow the buoyancy tank provided with the support of the linear body, and the gravity anchor provided with the anchor and the sinking tank to the installation place of the power transmission tower in a state of floating on the water,
A power transmission tower composed of a tension mooring type floating body structure is formed by pouring water into the tank for floating and sinking, sinking the gravity anchor to the bottom of the water, and mooring the buoyancy tank connected to the gravity anchor through a tendon in the water. A transmission tower installation method characterized by installation. The power transmission tower installation method according to claim 17, wherein the buoyancy tank and the gravity anchor are towed in a state where the buoyancy tank and the gravity anchor are connected by a wire shorter than the tendon. While the anchor is positioned on the float / sink tank, the up / down positions of the float / sink tank and the anchor are switched while towing the buoyancy tank and the gravity anchor and sinking the gravity anchor to the bottom of the water. The installation method of the power transmission tower of Claim 17 or 18. A method for installing an aerial overhead power transmission system including a plurality of power transmission towers for supporting a linear body on water,
Each of the plurality of power transmission towers includes a support for the linear body, a buoyancy tank provided with the support, and a gravity anchor including an anchor and a sinking tank.
A step of supporting the linear body at a support position on the support body of the power transmission tower, and a step of towing the buoyancy tank and the gravity anchor of the power transmission tower supporting the linear body in a floating state And a step of sequentially repeating for each of the plurality of power transmission towers. A method for installing an aerial overhead power transmission system including a plurality of power transmission towers for supporting a linear body on water,
Each of the plurality of power transmission towers includes a support for the linear body, a buoyancy tank provided with the support, and a gravity anchor including an anchor and a sinking tank.
Towing the buoyancy tank and the gravitational anchor of each of the plurality of power transmission towers to a place of installation in a floating state;
Laying the linear body on the water along the plurality of power transmission towers;
And supporting the linear body laid on the water on each of the plurality of power transmission towers at a support position corresponding to each of the plurality of power transmission towers. How to install an aerial power transmission system. For each of the plurality of power transmission towers, there is a step of irrigating the floating tank by sinking the gravity anchor to the bottom and mooring the buoyancy tank connected to the gravity anchor through a tendon in the water. The installation method of the aerial overhead power transmission system according to claim 20 or 21, characterized in that   23. The installation method of the aerial overhead power transmission system according to claim 21 or 22, wherein the support position is marked on the linear body.

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