JP2006296053A - Structure of steel tower in transmission grid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the structure of a steel tower that does not disturb the operation of a light-wind vibration preventing damper installed in the vicinity of an anchoring part of an aerial cable. <P>SOLUTION: A branch unit 5 that forms a path in which a monitoring self-propelled machine transfers to a bypass 3 from the aerial cable 2, or in reverse, is attached to an aerial cable anchoring clamp 6 at the steel tower 1 side at its one part in a state that the self-propelled machine is placed on the aerial cable 2. The bypass 3 is preferably supported by a plurality of support tools mounted on the steel tower 1. Furthermore, the bypass 3 is preferably supported so that the bypass almost horizontally wraps around in the side of the steel tower 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a steel tower in a power transmission system. More specifically, the present invention relates to an improvement in the structure of a steel tower in a power transmission system suitable for the maintenance of a steel tower, overhead wires, the vicinity of the line, and the like using a monitoring self-propelled aircraft.

  Monitoring or patrol work (also referred to as patrol in this specification) for maintenance of steel towers, overhead lines, under the line, etc. in the power transmission system is an on-site work that requires a lot of manpower and time. It is carried out by helicopter on foot and in the sky. However, patrols by vehicle or on foot must be carried out at a pace of once a week, for example, and of course there is a change in personnel, but there is no rest in the monitoring itself, so there is a heavy burden on maintenance and inspection workers. There is a side. In addition, helicopter monitoring work is easily affected by the weather, and requires sufficient consideration for safety so as not to cause a crash.

  Conventionally, as a means for inspecting each transmission line while avoiding such a problem, a self-propelled machine for monitoring a power transmission line that runs on an overhead line has been proposed. Furthermore, in order to allow the self-propelled aircraft to travel beyond the tower, a bypass that branches off from the overhead line of the tower is provided, and the self-propelled aircraft gets over the tower by running on this bypass. It has been proposed (see Patent Document 1).

Japanese Patent Laid-Open No. 10-023628

  However, the above-described monitoring self-propelled aircraft has the following problems. That is, first, since the bypass is branched from the overhead wire using, for example, a Y-shaped clamp, a damper for preventing slight wind vibration (the electric wire vibrates due to wind) attached near the retaining portion of the overhead wire. , The movement of the damper that prevents breaking at the retaining portion) may be affected. In other words, it is necessary to branch the bypass in order for the self-propelled aircraft to bypass the tower and still self-propelled, but depending on the branch structure, it may affect the movement of the damper for preventing slight wind vibration and hinder the work. There is.

  A little more explanation about this is as follows. That is, when the bypass is branched from the overhead line, the vibration is transmitted from the overhead line to the bypass. Furthermore, since the bypass is fixed to the steel tower, vibration is absorbed by the deformation of the bypass from the branch portion to the fixed portion. For this reason, the bypass itself assumes the vibration absorbing action. Therefore, at this time, there is a concern about fatigue of the bypass itself and its fixed portion. Further, as an influence on the damper, it is conceivable that the resonance condition of the damper changes due to the bypass. From the above, two effects of “inhibiting the function of the damper” and “vibration fatigue of the bypass itself and the fixed portion” may occur.

  Second, in order to carry out monitoring work using a self-propelled aircraft for monitoring, every time the monitoring work is performed, the worker must climb the steel tower and attach the self-propelled aircraft to the overhead ground line. There is a problem that it is very inconvenient if it is assumed to be used daily.

  Therefore, the present invention provides a structure of a steel tower that does not hinder the action of the damper for preventing slight wind vibration attached near the retaining portion of the overhead wire when monitoring the steel tower, overhead wire, etc. using the monitoring self-propelled aircraft. The purpose is to provide. A further object of the present invention is to provide a structure of a steel tower that does not require an operator to climb the steel tower every time monitoring work is performed.

  In order to achieve this object, the present inventor has repeatedly conducted various studies, and as a result, has come to find a technique that does not hinder the function of the damper for preventing slight wind vibration. Furthermore, the present inventor has also found out a technique that does not require an operator to climb a steel tower every time monitoring work is performed.

  The present invention is based on such knowledge, and the invention according to claim 1 is directed to an overhead wire installed between steel towers and a bypass that bypasses the steel tower by causing the monitoring self-propelled machine to self-propel to a steel tower, overhead wire, etc. In the structure of the tower in the power transmission system that monitors the state, the branching device that forms a passage for the monitoring self-propelled aircraft to transfer from the overhead line to the bypass or vice versa is placed on the overhead line. A part thereof is attached to an overhead wire retaining clamp on the tower side.

  When, for example, an overhead ground wire is installed between adjacent steel towers, the end of the overhead ground wire may be fixed by an overhead wire retaining clamp. In the present invention, the overhead wire retaining clamp is used to attach the branching device to the overhead wire retaining clamp in a state of being placed on the overhead wire. The branching device in such a case is in an integrated state with respect to the overhead wire retaining clamp, but is only placed on the overhead wire. It is possible to move a little relative to the line. Therefore, unlike the conventional Y-shaped clamp or the like, the branching device according to the present invention does not affect the movement of the damper for preventing slight wind vibration. The monitoring self-propelled aircraft traveling on the overhead line can transfer from the overhead line to this branching unit and continue to travel on the bypass.

  The invention according to claim 2 is that the bypass of the steel tower in the power transmission system according to claim 1 is supported by a plurality of supports provided in the steel tower. In this case, the bypass is more stable than the case where it is supported only by a single support.

  In addition, as described in claim 3, the bypass in the above is preferably supported in a form that wraps around the side of the steel tower substantially horizontally. In such a case, the bypass is small or even if there is no undulation.

  Furthermore, the invention according to claim 4 is the structure of the steel tower in the power transmission system according to any one of claims 1 to 3, and a lifting platform on which the self-propelled machine for monitoring is mounted, and the monitoring work is started or ended. And a guide rail that is installed on the side of the tower to guide the elevator.

  For a steel tower for which monitoring starts or ends, a guide rail is attached to the side surface of the steel tower, and a lifting platform that moves up and down along the guide rail is attached. For example, a monitoring self-propelled machine that is hung from the bypass is mounted on the lifting platform. In this case, the bypass branched from the overhead line passes, for example, to the side of the steel tower and leads to the monitoring self-propelled aircraft mounted on the lifting platform. Therefore, according to this steel tower structure, the self-propelled aircraft for monitoring can be self-propelled and transferred from the overhead line to the bypass, and further from the bypass to another overhead line.

  Moreover, it is preferable that said lifting stand is provided with the supporting member for the monitoring self-propelled machine connected with a bypass, when it raises to the tower top vicinity of a steel tower as described in Claim 5. By raising the lifting platform with the supporting member supporting the monitoring self-propelling machine and connecting the supporting member and the bypass, the monitoring self-propelling device can be easily transferred from the lifting platform to the bypass.

  According to the structure of the steel tower in the power transmission system according to claim 1, when monitoring the steel tower, overhead wire, etc. using the monitoring self-propelled aircraft, the function of the damper for preventing the slight wind vibration is inhibited by the branching device. There is nothing. For this reason, it becomes possible to form the traveling path of the monitoring self-propelled aircraft connected to the bypass from the overhead line while effectively preventing the vibration of the overhead line.

  According to the structure of the steel tower in the power transmission system according to claim 2, the bypass that goes around the side of the steel tower can be supported in a stable state by a plurality of support tools. For this reason, the stability with respect to external factors, such as a strong wind, is high.

  According to the structure of the steel tower in the power transmission system according to claim 3, there is little or no undulation of the bypass that goes around the side of the steel tower. For this reason, the fluctuation of the load acting on the drive source when the monitoring self-propelled vehicle travels on the bypass is extremely small. Further, since the speed fluctuation of the monitoring self-propelled aircraft is reduced, it is possible to travel more stably.

  According to the structure of the steel tower in the power transmission system according to claim 4, it is possible to easily lift and lower the monitoring self-propelled aircraft between the tower base and the tower top portion without manpower, thereby reducing labor and safety. The effect of improving the properties can be obtained.

  Furthermore, according to the structure of the steel tower in the power transmission system according to claim 5, when the monitoring self-propelled machine is installed or recovered, an easy transfer between the lifting platform and the bypass is realized.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  1 to 12 show an embodiment of the present invention. The structure of the tower 1 in the power transmission system according to the present invention includes an overhead line 2 installed between adjacent towers 1 and a bypass 3 for bypassing the tower 1. By making the monitoring self-propelled machine 4 self-propelled, it is possible to monitor the tower 1, the overhead line 2, the peripheral part under the overhead line 2, and the like. Further, the branching device 5 is attached to the overhead wire retaining clamp 6 to form a passage for the monitoring self-propelled aircraft 4 to transfer from the overhead wire 2 to the bypass 3 or vice versa. “Overhead line” in this specification includes both power transmission lines and overhead ground lines, but in the embodiment shown below, a self-propelled for monitoring over an overhead ground line (also called a ground wire) that functions as a lightning protection line The structure of the steel tower 1 when the machine 4 self-propels and performs the monitoring work will be described.

  An overhead ground wire (hereinafter referred to as reference numeral 2) is also called a lightning protection wire, and is provided at the top of the tower 1 in order to prevent lightning directly hitting the overhead power transmission line. This overhead ground wire 2 is provided in one line, but in some cases, it may be provided in two lines. Moreover, in this embodiment, the bypass 3 is connected to this aerial ground wire 2 via the branching device 5, and the monitoring self-propelled aircraft 4 is caused to self-run along these aerial ground wire 2, the branching device 5 and the bypass 3. I am going to do that. The overhead ground wire 2 is provided with a damper 11 for preventing light wind vibration (see FIG. 2 and the like).

  The damper 11 for preventing the slight wind vibration is to absorb the vibration of the electric wire caused by the fine wind by the resonance of the vibrating body (weight) and prevent the fatigue and damage of the electric wire. For example, the damper 11 is positioned about 1 m from the overhead wire retaining clamp 6. Is attached. In this embodiment, a double torsional damper is used as the damper 11 for preventing slight wind vibration (see FIGS. 3 and 4). The double torsional damper includes, for example, one electric wire gripping portion 14, two weights 13, and a steel strand 12 that absorbs vibration. In this case, there are two torsional movements that suppress the vibration depending on the frequency of the slight wind vibration generated in the overhead power transmission line.

  Moreover, the end of the overhead ground wire 2 is fastened by an overhead wire retaining clamp (in this embodiment, more specifically, an overhead ground wire retaining clamp) 6 and is stretched between steel towers. (See FIG. 2 etc.). Although not specifically described here, the overhead wire retaining clamp 6 includes, for example, a gold wheel passing retaining clamp, a compression retaining clamp, a high pressure retaining clamp, and a laughter preventing retaining clamp that prevents laughing of the electric wire at the mouth of the aluminum clamp. is there.

  The bypass 3 is a detour that is provided to bypass the tower 1, and the monitoring self-propelled aircraft 4 bypasses the tower 1 by moving from the aerial ground wire 2 to the bypass 3 and further self-propels. It is possible to continue. As described above, in this embodiment in which the monitoring self-propelled aircraft 4 is self-propelled on the overhead ground wire 2, the bypass 3 is provided so as to connect the overhead ground wires 2 provided before and after the steel tower 1. (See FIG. 1 etc.). It should be noted that the bypass 3 is not directly fixed to the aerial ground wire 2 so as not to affect the movement of the slight wind vibration preventing damper 11.

  Here, it is preferable that the bypass 3 is supported in such a manner as to wrap around the side of the steel tower 1 almost horizontally. For example, when the monitoring self-propelled aircraft 4 climbs uphill, an extra torque is required. However, if there is no undulation of the bypass itself or it is extremely small, no extra torque is required. Just do it. Further, if there is little or no undulation, the speed fluctuation during the self-running of the monitoring self-propelled aircraft 4 is reduced accordingly, which is preferable from the viewpoint of monitoring the steel tower 1 and the overhead line (overhead power transmission line).

  Further, when the bypass 3 is provided so as to go around the side of the steel tower 1 almost horizontally, the bypass 3 includes a plurality of support tools provided on the steel tower 1 (for example, support fittings attached to the steel tower 1, etc.) ) 7 is preferable (see FIG. 1 and the like). In such a case, the bypass 3 can be maintained in a stable state by supporting at more points. For example, when the monitoring self-propelled aircraft 4 passes through the bypass 3, it is possible to reduce the amount of sinking of the monitoring self-propelled aircraft 4 and the bypass 3.

  Below, the connection form of the overhead ground wire 2 and the bypass 3 with respect to the steel tower 1 is demonstrated (refer FIG. 1, FIG. 2). In the case of this embodiment, the branching device 5 is placed on the overhead ground wire 2, a part of the branching device 5 is attached to the overhead wire retaining clamp 6, and one end of the bypass 3 is connected to the branching device 5. A continuous passage is formed (see FIGS. 1 and 2). In such a case, the branching device 5 is in a fixed state with respect to the overhead wire retaining clamp 6, but is only placed on the overhead wire 2 but not fixed, and moves relatively. It is possible to do. For this reason, this branching device 5 does not affect the movement of the slight wind vibration preventing damper 11 attached to the overhead ground wire 2. If an example of a structure is shown, for example in this embodiment, the edge part near the steel tower 1 of the branching device 5 will be formed according to the shape of the damper 11 for slight wind vibration prevention, and this edge part will be prevented by a bolt etc. It is made to fix to the damper 11 for use. In this case, the branching device 5 may be placed on the damper 11 for preventing slight wind vibration (see FIG. 2). In short, what is necessary is just to form the path | route of the self-propelled machine 4 for monitoring, without inhibiting the function of the damper 11 for preventing a slight wind vibration.

  If the specific example of such a branching device 5 is given, the rail provided with the ramp (ramp) for guiding the monitoring self-propelled machine 4 smoothly is desirable. For example, in the present embodiment, a rail provided with two stages of ramps 5a and 5b is used as the branching unit 5, and the monitoring self-propelled machine 4 is raised (or lowered) in two stages (FIG. 2). reference). A bypass 3 is connected to the branching device 5, and the monitoring self-propelled machine 4 traveling on the branching device 5 continues to travel on the bypass 3. The bypass 3 that continues from the branching device 5 is formed so as to bend sideways and bypass the steel tower 1 (see FIG. 1). In this case, all of the bypass 3 can be made of a wire having a high degree of freedom of shape. For example, if at least a portion near the branching device 5 of the bypass 3 is made of a metal rail, the portion is initially formed. This is preferable in that the shape can be maintained.

  The monitoring self-propelled aircraft 4 is self-propelled on the overhead ground wire 2 and on the bypass 3 continuous to the overhead ground wire 2 to monitor the steel tower 1, the overhead ground wire 2, the surrounding area under the overhead ground wire 2, etc. It is a self-propelled vehicle for performing. Here, the drive system of the monitoring self-propelled aircraft 4 traveling on the bypass 3 that is curved in the middle is not only a grooved wheel, but also a mechanism for preventing the wheel from being removed, the curved portion of the bypass 3 A structure including a mechanism for traveling the vehicle is desirable. The monitoring self-propelled machine 4 of the present embodiment includes two traveling rollers 15 disposed in the front and rear directions of the traveling direction, and a pair of side rollers 16 disposed on the lower left and right sides of the traveling rollers 15. (See FIGS. 5 to 7). The traveling roller 15 is a roller that rolls on the overhead ground wire 2 and the bypass 3, and is driven by a motor 17. Further, the side rollers 16 are positioned on the left and right sides of the overhead ground wire 2 and the bypass 3, and hold the traveling roller 15 from the overhead ground wire 2 and the bypass 3 so as not to fall off (see FIG. 7). In the present embodiment, the distance between the left and right side rollers 16 is made wider than the thickness of the overhead ground wire 2 and the bypass 3 so as not to hinder the monitoring self-propelled aircraft 4 from traveling on the curved portion of the bypass 3. (See FIG. 7). Further, although not shown in particular, by using an elastic pressure such as a spring, when the overhead ground wire 2 travels, a fixed distance between the left and right side rollers 16 (about the thickness of the overhead ground wire 2) is maintained. As a mechanism that naturally expands to the necessary width when traveling on the curved part of, no rattling during traveling is eliminated. A total of four legs 18 are provided on the left and right sides of the traveling roller 15, respectively. These legs 18 support a casing 19 provided with a monitoring device, for example (see FIGS. 6 and 7). Further, a gap is formed between the legs 18 on both sides so that the slight wind vibration preventing damper 11 can pass through (see FIG. 8A). In the present embodiment, the above-described ramp 5a is installed at a position farther from the breeze vibration preventing damper 11 when viewed from the steel tower 1 (see FIG. 2). By doing so, the monitoring self-propelled aircraft 4 passing through the ramp 5a is gradually lifted and raised so that the breeze prevention damper 11 passes through the gap formed in the monitoring self-propelled device 4.

  Further, a device that is opened when necessary to allow the overhead ground wire 2 to pass through is provided on either the left or right side of the main body of the monitoring self-propelled aircraft 4. For example, in the case of the present embodiment, an on-off valve 20 is provided on each of the front and rear legs 18 on the right side (or left side) of the traveling direction so as to lie down and form an open space through which the imaginary ground wire 2 can pass. (See FIGS. 5 to 7). The on-off valve 20 can be opened and closed by the action of an actuator such as a solenoid. In addition, a sensor (not shown) that can detect that an object has approached is provided on the inner side of the on-off valve 20 in the leg 18. When the monitoring self-propelled aircraft 4 is transferred from the overhead ground wire 2 to the bypass 3, for example, when this sensor detects the overhead ground wire 2 that shifts relatively to the side, the on-off valve 20 is opened, An open space through which the ground wire 2 can pass is formed.

  When passing through the overhead ground wire 2, it is possible to open the front and rear two on-off valves 20 at the same time, but when the monitoring self-propelled aircraft 4 is transferred from the overhead ground wire 2 to the bypass 3, or vice versa. When moving from the bypass 3 to the overhead ground wire 2, the monitoring self-propelled aircraft 4 travels obliquely forward with respect to the overhead ground wire 2, so the timing at which the overhead ground wire 2 passes through the open space There is a difference between before and after. Therefore, in the present embodiment, a time difference is provided in the timing for opening the front and rear on-off valves 20 so that both on-off valves 20 are not operated simultaneously. In such a case, since at least one of the on-off valves 20 is always closed, even if the traveling roller 15 is displaced laterally from the overhead ground wire 2 or the bypass 3, the monitoring self-propelled vehicle 4 is prevented from falling. be able to.

  Subsequently, an operation when the monitoring self-propelled aircraft 4 is transferred from the overhead ground wire 2 to the bypass 3 will be described with reference to FIGS. 8 to 10. First, as step 1, the monitoring self-propelled aircraft 4 is transferred from the overhead ground wire 2 to the branching device 5 (see FIGS. 8A and 8B). At this time, the monitoring self-propelled aircraft 4 ascends the first-stage ramp 5a of the branching device 5 and goes up to a position one step higher. Further, during traveling, the gentle wind vibration preventing damper 11 passes through the gap between the legs 18 of the monitoring self-propelled aircraft 4. Next, in step 2, the monitoring self-propelled aircraft 4 is moved up to a higher position by climbing up the second-stage ramp 5b of the branching device 5 (see FIGS. 9A and 9B). At this time, the position (height) of the overhead ground wire 2 with respect to the monitoring self-propelled aircraft 4 is approximately the same as the open space for passage formed by the on-off valve 20 (see FIG. 9A). Further, in step 3, the monitoring self-propelled aircraft 4 travels along the bypass 3 and gradually moves to the side of the steel tower 1 (see FIGS. 10A and 10B). At this time, if the front on-off valve 20 is opened, the overhead ground wire 2 first passes through the front open space (see FIG. 10A). Thereafter, when the front on-off valve 20 is closed and the rear on-off valve 20 is opened, the overhead ground wire 2 also passes through the rear open space. The monitoring self-propelled aircraft 4 and the overhead ground wire 2 are separated at this point. The monitoring self-propelled aircraft 4 thereafter travels along the bypass 3 and operates to bypass the tower top. In addition, when the monitoring self-propelled aircraft 4 after detouring the top of the tower returns to the overhead ground wire 2 again, the reverse operation described above is performed. Detailed description of this reverse operation is omitted.

  Further, the tower 1 is provided with a lifting platform 8 and a guide rail 9 (see FIGS. 11 and 12). The lifting platform 8 is a platform that can be moved up and down with the monitoring self-propelled machine 4 mounted thereon, and the guide rail 9 guides the lifting platform 8 along the steel tower 1. For example, in the case of this embodiment, a support column 21 is provided at a position near the end on the lifting platform 8, and a substantially horizontal cantilevered support bar 10 is provided on the support column 21 (FIG. 11 and the like). reference). Further, the bypass 3 is provided to the side of the steel tower 1, and the end of the bypass 3 and the end of the support bar 10 are connected when the elevating table 8 moves up and down to the top of the tower.

  Furthermore, in the case of this embodiment, these lifting platforms 8 and guide rails 9 are installed only on the side of the steel tower 1 where the monitoring work starts or ends. That is, it is necessary to lift the monitoring self-propelled machine 4 to a predetermined height with respect to the tower 1 that is the start point of the monitoring work, and further, the monitoring work is started from the tower 1 that is the end point of the monitoring work. The completed self-propelled aircraft 4 for monitoring needs to be lowered to the ground and collected. In view of these needs, in this embodiment, a guide rail 9 is provided on the side of the steel tower 1 where the monitoring work starts or ends, and the elevator 8 is moved up and down along the guide rail 9. (See FIG. 11). In this case, in the steel tower 1 in which the guide rail 9 and the lifting platform 8 are installed, both the work of lifting the monitoring self-propelled machine 4 to be placed at a predetermined position and the work of lowering and collecting it may be performed. However, only one of these may be performed. In short, if the lifting platform 8 and the guide rail 9 as described above are installed, it is possible to carry out at least one of the work of lifting and arranging the monitoring self-propelled machine 4 and the work of lowering and collecting it. Become.

  Here, the elevator 8 and the guide rail 9 of the present embodiment installed in the tower 1 in order to arrange the monitoring self-propelled machine 4 at the tower top of the tower 1 or recover from the tower top will be described below ( Refer to FIG. In the case of this embodiment, the elevator 8 and the guide rail 9 are installed in both the tower 1 where monitoring is started and the tower 1 where it is finished. The guide rail 9 is formed in a straight line from the leg part (tower leg part) of the steel tower 1 to the tower top part. Furthermore, a lifting platform 8 that moves up and down along the guide rail 9 between the tower base and the tower top is provided. Although the drive source of the lifting platform 8 is not particularly limited, for example, a motor or the like is used. Further, a positioning sensor (not shown) including an object proximity sensor or a limit switch is provided at the bottom of the elevator base 8, for example. When this positioning sensor detects, for example, a sensor portion provided at a predetermined position of the guide rail 9, the monitoring self-propelled machine 4 automatically stops at predetermined positions on the top of the head and the tower base. Yes. The lifting platform 8 is preferably detachable from the guide rail 9. When it is made detachable, it becomes possible to share one lifting platform 8 in the plurality of steel towers 1.

  Moreover, in this embodiment, it is supposed that the monitoring self-propelled machine 4 is arranged on the tower top portion of the steel tower 1 by the elevator 8 and the guide rail 9 as described below. That is, the elevator 8 is first placed in the tower base, and the monitoring self-propelled machine 4 is placed on the elevator 8 on the ground. More specifically, the monitoring self-propelled machine 4 is installed so that the traveling roller 15 is placed on the support bar 10 (see FIG. 12). After installing the monitoring self-propelled aircraft 4, the elevator 8 is raised to the top of the tower, and the support bar 10 and the bypass 3 are connected. If it does so, the self-propelled machine 4 for monitoring should just drive | work and should transfer to the bypass 3 from the support bar 10 on the raising / lowering stand 8. FIG. On the other hand, in order to collect the monitoring self-propelled aircraft 4 that has been monitored, the reverse operation may be performed. That is, the elevator 8 is made to stand by at the top of the tower, and the monitoring self-propelled machine 4 is transferred from the bypass 3 to the elevator 8. When the vehicle is transferred, the elevator 8 is lowered to the tower base and the monitoring self-propelled machine 4 is collected on the ground to complete the operation.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, in the present embodiment, a description has been given of one mode in which the monitoring self-propelled aircraft 4 travels on the overhead ground wire (ground wire) 2 and on the bypass 3 connected thereto, but this is only an example. It can also be applied to overhead wires for electric wires. That is, the “overhead line” in the present specification is used to mean a general term of a line stretched on the ground.

  Further, from the viewpoint of not hindering the function of the breeze vibration preventing damper 11, a part of the branching device 5 (from a portion branched from the overhead ground wire 2 to a portion fixed to the overhead wire retaining clamp 6 is used. It is also preferable to provide a movable part in any part). By doing so, the further effect that the function of the damper 11 for preventing the slight wind vibration is not hindered can be obtained. For example, as shown in FIG. 13, for example, a part of the ramp 5a may be formed of a flexible elastic member to form the movable portion 22 (see FIG. 13). In FIG. 13, a Y-shaped clamp 23 is provided at the tip portion of the ramp 5 a to fix a part of the branching device 5 to the overhead ground wire 2. Originally, it is desirable not to install the Y-shaped clamp 23 so as not to affect the movement of the damper 11 for preventing the slight wind vibration. However, as shown in FIG. 13, when the branching device 5 is attached to the overhead wire retaining clamp 6 and sufficient measures are taken to provide the movable portion 22 as described above, the Y-shaped clamp Even if 23 is installed, it is possible not to disturb the function of the damper 11 for preventing the slight wind vibration. From the above, the structure of the tower 1 in the power transmission system shown in FIG. 13 is (1) the movable part 22 is provided at any one of the branching part to the fixed part of the branching device 5 for vibration countermeasures. In order to allow the slight wind vibration preventing damper 11 to pass through the gap (the space portion formed between the legs 18 on both sides) of the monitoring self-propelled aircraft 4, it is in front of the damper (11). A contact point between the branching device 5 and the overhead ground wire 2 is provided at a position farther from the side of the device, and a ramp 5a is provided so that the slight wind vibration preventing damper 11 gradually rises during traveling. 3) In order to allow the monitoring self-propelled vehicle 4 to travel on the bypass 3 stably, the bypass 3 is bypassed to eliminate ups and downs, and the monitoring self-propelled vehicle 4 is located on the side of the top of the tower 1. It has a feature such as passing through There.

  Moreover, although the thing provided with the cantilevered support bar 10 was illustrated as an example of the raising / lowering stand 8, this is also only a suitable example. For example, the support pillars 21 may be provided on the left and right, and the same wire as the bypass 3 may be provided between the support pillars 21. In short, these supporting members for supporting the monitoring self-propelled machine 4 are connected to the bypass 3 when the lifting platform 8 rises to the top of the tower, and the monitoring self-propelled machine 4 can be smoothly delivered onto the bypass 3. If it is enough.

  Further, in this specification, the guide rail 9 is provided on the side of the steel tower 1, but the side here is not limited to the horizontal direction in which the arm 1 a of the steel tower 1 is laid, It also includes the front-rear direction in which. In short, the monitoring self-propelled vehicle 4 is mounted on the lifting platform 8 and is moved up and down between the tower top and the tower leg, and the monitoring self-propelled vehicle 4 is smoothly moved between the lifting platform 8 and the bypass 3. The direction in which the guide rail 9 is installed is not particularly limited as long as it can be transferred. In addition, in the case of this embodiment which provided the guide rail 9 in the side part of the steel tower 1, the raising / lowering base 8 passes between the arm brackets 1a of the steel tower 1 and raises / lowers (refer FIG. 12).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and is a perspective view illustrating an example of a structure of an overhead ground wire, a bypass, an overhead wire retaining clamp and the like in the vicinity of a tower top of a steel tower. It is a figure which shows structures, such as an overhead ground wire, a bypass, the damper for a slight wind vibration prevention, and an overhead wire retention clamp in this embodiment. It is a side view which shows an example of the damper for light wind vibration prevention. It is the figure which looked at the damper for a slight wind vibration shown in FIG. 3 from the overhead line direction of the overhead ground wire. It is a side view which shows an example of the monitoring self-propelled aircraft. FIG. 6 shows how the on-off valve operates in the monitoring self-propelled aircraft shown in FIG. 5. It is the figure which looked at the self-propelled machine for surveillance shown in FIG. 5 from the overhead line direction of the overhead ground wire. Step 1 of the operation when the monitoring self-propelled aircraft is transferred from the overhead ground wire to the bypass (operation in which the monitoring self-propelled aircraft is transferred from the overhead ground wire to the branching device) is shown in FIG. The figure seen from the overhead line direction of the ground wire, (B) is a side view. Step 2 of the operation when the monitoring self-propelled aircraft moves from the overhead ground wire to the bypass (the operation that the monitoring self-propelled aircraft climbs up the ramp on the second stage of the turnout) FIG. 2A is a diagram viewed from the overhead line direction of the overhead ground wire, and FIG. Step 3 (operation in which the monitoring self-propelled aircraft travels along the bypass and gradually goes to the side of the tower) when the monitoring self-propelled aircraft transfers from the overhead ground wire to the bypass (A) is a view seen from the overhead line direction of the overhead ground wire, (B) is a side view. It is a perspective view which shows an example of the steel tower structure provided with the lifting platform and the guide rail. It is a figure of the tower top part and tower leg part for demonstrating the operation | movement at the time of installing or collect | recovering the monitoring self-propelled aircraft using an elevator. FIG. 5 is a view showing another embodiment of the present invention, and is a diagram showing structures such as an overhead ground wire, a bypass, a slight wind vibration preventing damper, an overhead wire retaining clamp and the like.

Explanation of symbols

1 Steel Tower 2 Overhead Ground Line (Overhead Line)
DESCRIPTION OF SYMBOLS 3 Bypass 4 Monitoring self-propelled machine 5 Branch device 6 Overhead wire retention clamp 7 Support tool 8 Lifting stand 9 Guide rail 10 Support bar (support member)

Claims (5)

  In the structure of the tower in the transmission system in which the overhead line installed between the towers and the bypass bypassing the tower are caused to self-propelled by the monitoring self-propelled machine to monitor the tower, overhead lines, etc. A branching device that forms a passage for the self-propelled aircraft to transfer from the overhead line to the bypass or vice versa is partially mounted on the overhead line retaining clamp on the tower side while being placed on the overhead line. The structure of the steel tower in the transmission system, characterized in that it is installed.   The said bypass is supported by the some support tool provided in the said steel tower, The structure of the steel tower in the power transmission system of Claim 1 characterized by the above-mentioned.   The structure of the tower in the power transmission system according to claim 2, wherein the bypass is supported so as to wrap around the side of the tower almost horizontally.   The elevator comprises a lifting platform on which the self-propelled machine for monitoring is placed, and a guide rail that is installed at a side of the steel tower where monitoring work is started or ended and guides the lifting platform. The structure of the steel tower in the power transmission system as described in any one of 1-3.   5. The tower of the power transmission system according to claim 4, wherein the lifting platform includes a support member for the monitoring self-propelled aircraft that is connected to the bypass when the elevator is raised to the vicinity of a tower top of the tower. Construction.

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