JPH0472942B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improvements in protective scaffolding used when extending overhead power transmission lines over obstacles.

[Background and purpose of the invention] When extending an overhead power transmission line, a method is generally adopted in which a steel tower is first constructed, a metal wheel is suspended from the arm of the tower, and the wire is extended onto the metal wheel. has been done. However, the degree of slack in the electric wire during the wire drawing is entirely dependent on the wire tension.
It is in a very unstable state, and there is a risk that the laxity may increase unexpectedly due to a small cause. Therefore, when a power transmission line is constructed across so-called obstacles such as railways, roads, or other power transmission lines, the slack of the power line during the line is reduced and the power line is able to cross these obstacles. It may even hang down on top of the . In such a case, if the obstacle is an existing live power transmission line, it is extremely dangerous. For this reason, in the past, the electric wires were extended by constructing exaggerated protective scaffolding to protect such obstacles from sagging electric wires.

FIG. 1 and FIG. 2, which is a plan view thereof, show an example of such a protective scaffolding when ultra-high voltage layer electric wires 3, 3 are extended across the existing power transmission line 4, which is the obstacle. Scaffolding steel poles 5, 5' are constructed on both sides of the existing track 4, and the steel poles 5, 5' are reinforced with steel pole support lines 9, 9, and the existing track 4 is reinforced.
The electric wire 3 is being extended with a protective net 6 stretched above it,
3 is constructed to sufficiently protect it from coming into contact with existing electric wires even if it hangs down. In this manner, the extension work for the newly constructed line is carried out. In the figure, 1 and 1' are steel towers for the new line, 2 is the overhead ground wire of the new line, 7 is the existing power transmission line, and 8 is the overhead ground wire of the existing line.

However, if the existing line mentioned above is an extra high voltage line and the new line is a 500KV ultra high voltage line, the ground clearance of the scaffolding to protect the extra high voltage line will be extremely high. Not only that, but the width of the scaffold will also increase, and it is undeniable that the scale of the protective scaffold will become extremely large. Therefore,
In addition to the enormous cost involved in acquiring land for this purpose, the scaffolding material itself lacks versatility once it is used due to restrictions due to the protection target and topography, resulting in unnecessary expenditure. I was getting used to it.

In view of the above-mentioned circumstances, the present invention has been devised to provide a simple and versatile aerial transport system that can be constructed at any required height when required, regardless of the size or nature of the obstacles to be protected. The purpose is to provide a protective footing for a hanging structure when extending electric wires across obstacles.

[Summary of the Invention] In other words, the present invention does not involve assembling protective steel columns as in the conventional example, but instead stretches a plurality of parallel wires with approximately the same degree of sag between newly installed electric wire supports, such as steel towers. The slackness of the wires can be changed to the same degree, and a braking action is provided to prevent excessive slackness from occurring, and each wire must be placed above the obstacle to prevent contact due to falling wires. The feature is that it is constructed as a protective scaffold with a hanging structure to which a preventive protective member is attached.

[Example] A detailed explanation will be given below based on examples.

In this embodiment, a case will be explained in which the ultra-high voltage power transmission lines 3, 3 are extended across the top of the live special high voltage line 4 as in FIG. 1, but the present invention is not intended. It goes without saying that obstacles are not limited to such cases.

Steel towers 1, 1' for the new line are constructed across the existing line 4, and scaffolding frames 16, 16' for securing wires, which will be described later, are fixed to opposite sides of each tower. These frames 16, 16' are different from the steel columns described in the conventional example, in that only one pair is required, and they can be repeatedly used for general purposes. An insulating and strong pilot rope 11 made of, for example, nylon is first stretched over the existing track 4 between the scaffold frames 16, 16'.

FIG. 3 shows one convenient method for extending such a pilot rope 11, which is a very efficient method of extending the pilot rope 11 by a self-propelled machine using the existing overhead ground wire 8 of the existing track 4. It shows. That is, 14 is a fixed point of the pilot rope 11, 12 is a pulley, 10 is a self-propelled machine attached to the overhead ground wire 8, and 13 is a winch. A rope is connected to the self-propelled machine 10 attached to the overhead ground wire 8 on one of the towers 4a side of the existing track 4 to pull the self-propelled machine back to the tower 4a, as shown in Fig. 3. pilot rope 11
One end is fixed 14, and a pilot rope 11 is stretched via a self-propelled machine 10 to a pulley 12 and a winch 13. Next, pilot rope 11
The self-propelled aircraft 10 is made to travel to the intermediate point 15 while winding it up with the winch 13 so that it does not loosen, and when the pilot rope is made to travel until it reaches the position 11' shown by the dashed line in the figure, a signal is sent by radio from the ground. is sent to stop the self-propelled machine and the self-propelled machine 10
The pilot rope is cut off from the pilot rope, and the previously connected pull-back rope is pulled together to recover the self-propelled aircraft. FIG. 14 is an explanatory diagram showing an example of a self-propelled machine used in this case. That is, 4
Reference numerals 7 and 48 designate half rings that are opened and closed around a fulcrum 60 by a piston 50 of a hydraulic cylinder 49, and are closed while the vehicle is running, so that the pilot rope 11 is enclosed therein as shown in the figure. 19 is a rope for pulling the above-mentioned self-propelled machine back to the steel tower 4a.
The self-propelled machine travels on the overhead ground wire 8 by rollers 61, 61', and when it reaches the intermediate point, the piston 50 of the cylinder 49 is actuated by remote control to cut off the pilot rope 11. In addition, 62 is a frame of the self-propelled machine, 63 is a radio device for remote control of the piston, 64 is a hydraulic pump, and 6
5 is an oil tank, 66 is a moving caterpillar, 6
7 is a hydraulic motor, 68 is a support pin, 69 is a hydraulic pipe, 70 is an engine, and 71 is a hydraulic cylinder for opening and closing the caterpillar, which is used to open the caterpillar when the self-propelled machine is pulled back. be.

After the pilot rope 11 is stretched as described above, the messenger ropes 23, 23 for wire extension are then stretched. FIG. 4 is an explanatory diagram showing the situation. The winch 1
Messenger ropes 23, 23 and a messenger rope 22 for electric wire used when extending a newly installed electric wire are connected to the ends of the wires while being wound up by the frame 16, 16'. passed on. Reference numerals 21 and 21 are reel winders which prevent the rope from hanging down.
Note that the wire rope 22 is used when extending newly installed electric wires, so it is not directly related to the actual scaffolding, and after the wire has been stretched, it is temporarily raised upwards as shown in Figure 7. Just leave it there.

5 and 6 show how the messenger rope 23 stretched as described above is further re-strung with scaffolding ropes 24, 24 corresponding to the wire of the present invention. One end of the scaffolding ropes 24, 24 thus restrung is fixed to one frame 16' as shown in FIG. 6, and the other end is wound around the winding drums 25, 25.
FIG. 10 is an enlarged explanatory view showing details of the winding drum 25 side. That is, the winding drums 25, 25
are bearings 35, 35 fixed to the base 36.
If an excessive load is applied to one of the ropes 24, 24, which are commonly attached to the connecting shaft 33 fitted into the connecting shaft 33 and are wound with the same slackness, the slackness increases. , whereby the winding drum 25 is rotated, so the connecting shaft 33 is rotated,
All the winding drums 25, 25 are rotated simultaneously so that the slackness of the other ropes is automatically matched to the slackness of the one rope whose slackness has been increased, so that the slackness of all the ropes 24, 24 is It is designed to maintain the same degree of slack at all times. Note that, as shown in FIG. 10, a weight as shown as 29 in FIG. The ropes 24, 2 are tightened so that a rotational moment is applied in the direction in which the ropes 24, 24 are pulled up.
4 are held at a common predetermined tension state.

After the ropes 24, 24 are stretched as described above, a protective member is installed on the ropes 24, 24 to catch the newly installed electric wires if they droop. In this embodiment, an example is shown in which an insulated pipe 31 is used as a protection member, but in short, any material that can protect the electric wire from falling is sufficient, and is not limited to such a pipe.

Now, once the ropes 24 are set, the self-propelled machine 10 is attached to each rope as shown in FIG. An insulating pipe 31 is connected to the rope 30, and the rope 2
Insulated pipes 31, 31 in the direction perpendicular to 4, 24
A protective scaffold is formed. FIG. 13 is an explanatory diagram showing an example of the connection between the connecting rope 30 and the insulating pipe 31. That is, the carabiners 46, 46 are attached to the insulating pipe 31 to the mounting fittings 44, and the carabiners 46 and the connecting rope 30 are connected as shown in the figure. Note that the other carabiner 45 inserted into the scaffolding rope 24 is connected to the insulating pipe 31.
This is to prevent the scaffold rope from coming off the scaffolding rope 24.

Insulated pipes 31 connected as shown in FIG.
31 is each scaffolding rope 2 that is stretched
4 and 24 as shown in FIG. 12, and are drawn out at appropriate intervals. FIG. 8 shows that the insulated pipes 31, 31 are placed on the scaffolding ropes 24, 24 in this way.
It shows how things are unfolding all at once.
Finally, as shown in FIG. 9, a protective scaffolding made of insulated pipes 31, 31 is formed above the extra high voltage line 4 to be protected. However,
It is desirable to provide stoppers 43, 43 at both ends of the insulating pipe 31, as shown in FIG. 12, for example, to prevent the received electric wires or ropes from slipping down.

Since the hanging structure protective scaffold according to the present invention is formed as described above, there is no need to assemble exaggerated steel columns as in the conventional example, and it can be applied in any general purpose depending on the installation location. and
It is an epoch-makingly simplified structure that is simple and inexpensive, and it exhibits many advantages such as being extremely easy to remove after use.

Now, let us assume that a single load is applied to the suspension structure scaffold constructed as described above due to some reason such as a falling electric wire, causing an increase in the slack of the first rope 24. If it hits the rope at the end, the entire scaffold will tilt. If the entire scaffold is tilted in this way, there is a danger that the electric wires to be protected may fall onto the extra high voltage wires below. However, in the suspension structure scaffold according to the present invention, such danger is completely eliminated. That is, as described above, since each rope 24, 24 is wound around a winding trunk fixed to a common connecting shaft, if one winding trunk rotates to increase the slack of one rope, the common The connecting shafts also rotate together, causing all the winding drums to rotate to the same degree, and as a result, all of the scaffolding ropes 24, 24 have approximately the same slackness, and the scaffolding does not incline. However, all the ropes 24,
24 all at once, the entire scaffold will come into contact with the extra high voltage line. For example, as shown in FIG. That is, in this embodiment, a micro switch 41 is installed, and when the connecting shaft 33 rotates beyond a certain level, the disc cam 4 is activated.
0 actuates the switch 41, which operates the electromagnetic brake 32 shown in FIG. is designed not to occur. If the cause of the increase in slackness is removed, the rope's slackness is restored to its original level by the weight 29.

In addition to the embodiments described above, the slackness of the scaffolding may be maintained by a hydraulic control system as shown in FIG. 15. That is, in FIG. 15, the same reference numerals as in FIG. 10 indicate the same structure, and the scaffolding rope 2
4 and 24 are set to the same slackness, and then wrapped around the winding drum 72 several times to fix the ends to the winding drum 72. The torque generated by the scaffolding rope 24 is transmitted to the connecting shaft 33 and then to the hydraulic motor 75 via the reducer 74 . The hydraulic motor 75 is set so that the hydraulic circuit is closed and it will not rotate unless the tension of the rope 24 exceeds a certain level.

Assume that the tension in the rope 24 becomes so great as to exceed the set value in the above example. The rotational torque applied to the hydraulic motor 75 increases, and the relief valve 7
As a result of opening 6, the hydraulic oil flows through the hydraulic motor 75 → hydraulic pipe 77 → relief valve 76 → hydraulic pipe 78
→Hydraulic motor 75, and the hydraulic motor 75 rotates. Then, since the connecting shaft 33 rotates, the sensor 34 detects the rotation and operates the electromagnetic brake 32 to stop the rotation of the connecting shaft 33. Next, when the tension of the rope 24 decreases, the electromagnetic brake is released. As the tension of the rope 24 decreases, the rotational torque of the hydraulic motor 75 also decreases, so the oil pressure decreases and the relief valve 76 returns to its original state. At this time, if the hydraulic pump 82 is driven by the electric motor 83, the hydraulic motor 75
rotates, and rotational torque is applied to the connecting shaft 33 via the reducer 74. As a result, when the winding drum 72 winds up the rope 24 to a predetermined degree of slack, the rotation of the electric motor 83 is stopped. If the above requires the work to be stopped for a long time,
Since there is a risk of leakage in the hydraulic circuit, it is better to use the mechanical brake 73 in combination. In addition, in the figure, 79 is a check valve,
80 and 81 are hydraulic pipes.

[Effects of the Invention] As described above, according to the present invention, since no steel poles or steel towers are constructed for protective scaffolding as in the conventional example, land costs for constructing steel poles, etc., as well as guarantees for felling trees if there are trees, etc. are reduced. In addition, in the past, in addition to the cost of constructing individual steel poles and towers that were not versatile, it was necessary to separately account for their dismantling and depreciation, but with the present invention, the cost and effort of Since it can be easily assembled and used repeatedly, there is no need to look at depreciation, and most of the parts used are simple general-purpose items, so they are cheap and easy to obtain, so they have excellent economic effects. It has also made it possible to demonstrate this, and its significance to this industry is truly great.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the state of conventional scaffolding, Figure 2
The figure is a plan view thereof, Figures 3 to 9 are explanatory diagrams showing the construction process of the scaffold according to the present invention, Figure 10 is a partially enlarged view of the vicinity of the winding drum, and Figure 11 is an explanatory diagram of a micro switch that is a sensor. , Fig. 12 is an explanatory diagram showing how the protective member of the scaffold is attached, Fig. 13 is an explanatory diagram showing an example of how the connecting rope is fixed to the protective member, and Fig. 14 is an explanatory diagram showing an example of the self-propelled machine. , 1st
FIG. 5 is an explanatory diagram showing an example of a configuration when hydraulically controlling a scaffolding rope. 24...Scaffolding rope, 31...Protection member.

Claims (1)

[Scope of Claims] 1. A plurality of wires configured to be able to maintain a predetermined tension while crossing above the obstacle between electric wire supports such as steel towers constructed across an obstacle, with approximately the same slackness. When the slackness of at least one of the plurality of wires is reduced, the other wires can be linked to substantially the same slackness, and the wires are stretched so that the slackness of at least one of the plurality of wires is reduced. For crossing an obstacle, the wire is configured to be able to brake the wire, and a protective member capable of preventing the wire from falling is attached to the wire at least above the obstacle. Protective scaffolding with hanging structure during line extension. 2. Claim 1, characterized in that the means for interlocking each wire with the same slackness is achieved by fixing the winding drum around which each wire is wound to a common connecting shaft. Protective scaffolding for hanging structures when extending the line across the mentioned obstacles. 3. A protective scaffolding with a suspended structure when extending a line across an obstacle according to claim 1, wherein the braking means is a sensor that detects a decrease in slack and an electromagnetic brake activated by the sensor. 4. Claims 1 to 4, in which the means for maintaining a predetermined slack in each wire is based on a method of applying a predetermined rotational moment to a connecting shaft that commonly fixes the winding drum around which each wire is wound. A protective scaffolding with a hanging structure when extending a line across an obstacle according to any of Item 3.