JPH0588046B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention monitors and controls the wire extension work of a wire extension device that stretches overhead wires between a large number of steel towers installed between two remote points. This invention relates to monitoring equipment for overhead line work used in

(Prior Art) Conventionally, the above-mentioned construction work has been carried out, for example, as follows. First, the two points where the overhead wire will be stretched are designated as the drum field and the engine field, and a tow wire is placed on the tower between them using a helicopter or the like.

At the drum station, the overhead wire unwound from the drum is wound endlessly around the capstan of a wire extension car, and the wire is extended while applying braking. Then, the tip of the overhead wire is connected to the rear end of the towing wire via a joint protector, and the tip of the towing wire is wound up and towed by a winch installed at the engine station.

(Problem to be Solved by the Invention) However, in this overhead line work, when the joint protector passes through a metal wheel suspended from a steel tower, tension at the towing wire support point applied to the towing wire at the tip end of the overhead line due to passage resistance. (hereinafter referred to as support point tension) increases, and there are tension fluctuations such as a decrease in wire drawing tension in the drum field.

If overhead line construction continues with large tension fluctuations,
To prevent unexpected accidents from occurring, tension sensors, speed sensors, etc. are usually installed at the engine station and drum station to detect tension, speed, etc., and decelerate or temporarily stop the overhead line winches and track cars. Over time, tension maintenance control has been implemented.

However, due to the length of the distance between the advancing position of the joint protector and the railcar, there is a time lag between the occurrence and detection of abnormal tension, which poses the problem of difficulty in controlling the proper tension maintenance. Ta.

Structure of the Invention (Means for Solving Problems) A towing wire for towing a catenary line extended from a line car at a drum station via a joint protector is wound around a catenary winch at an engine station. In a wire extension device that stretches overhead wire between a large number of steel towers installed at two remote locations, a tow wire tension sensor detects the tow wire tension when the tow wire is wound around a catenary winch at an engine station; It is attached to a metal wheel suspended from one of the main steel towers installed between the drum field and the engine field, and when the joint protector passes the metal wheel, it is applied to the tow wire on the tip side of the overhead line. A metal wheel tension sensor detects the swing angle of the metal wheel that swings in response to the tension at the pulling wire support point, and a set swing angle for each main tower that is preset and input as the swing angle. The strength of the pulling wire support point tension is calculated indirectly from the magnitude of the deflection angle, and the calculated pulling wire support point tension is compared with the set pulling tension for each main tower that has been input in advance. The tension at the wire support point is compared with the tension at the wire support point, and when the former tension is larger than the latter tension, the pulling wire is pulled while maintaining the pulling wire tension within the range of the set tension at the pulling wire support point. A configuration is adopted that includes a control device that outputs a control signal for controlling the speed to the overhead wire winch, and a communication line disposed between the towing wire tension sensor, the metal wheel tension sensor, and the control device.

(Operation) This invention operates as follows. That is, a signal of the pulling wire tension at the engine station is sent from the pulling wire tension sensor, a signal of the wire tension of the overhead wire being extended at the drum station is sent from the pulling wire tension sensor at the drum station, and,
The swing angle of the metal wheel when the joint protector passes the metal wheel is input to the control device from the metal wheel tension sensor on the steel tower. Since the swing angle of each main steel tower to which the metal wheel tension sensor is attached is preset and input to the control device, the set swing angle and the swing angle detected by the metal wheel tension sensor are compared and calculated. Then, the strength of the tension at the pulling wire support point is calculated indirectly from the swing angle of the metal wheel. Since the pulling wire support point tension set in advance as described above is input to the control device, the control device compares and calculates this set tension and the calculated tension, and the former tension is determined by the latter tension. When it exceeds the above, a control signal to decelerate or stop rotation is output to the overhead line winch. Then, the pulling speed of the overhead line winch is reduced for a predetermined period, and the pulling tension of the overhead line winch is maintained within a predetermined range. During this time, the joint protector passes the metal wheel, the tension at the support point returns to the original tension, and the towing speed returns to its original state. This kind of control of the towing speed is repeated every time the metal wheel of the main tower passes the joint protector, allowing the overhead line work to proceed safely.

(Example) Next, an example embodying the present invention will be described based on FIGS. 1 to 5.

10km for which catenary 1 should be laid as shown in Figure 1
A drum field D and an engine field E have been established at two remote locations. A towing wire 3 is stretched between the steel towers 2 by a helicopter or the like. A metal wheel 8 having a shape as shown in FIG.
is suspended, and the pulling wire 3 is passed through the metal wheel 8.

After the tip of the overhead wire 1 unwound from the drum 6 in the drum field D is wound endlessly around the capstan of the extension car 7, the tip of the overhead wire 1 is passed through the joint protector 4 to the towing wire. The towing wire 3 is connected to the rear end of the towing wire 3, and the leading end side of the towing wire 3 is wound around a catenary winch 5 at the engine station E. Therefore, the pulling wire 3
When the joint protector 4 is towed, the joint protector 4 passes through the metal wheel 8 of each steel tower 2 one after another, and the overhead wire 1 is stretched around the metal wheel 8.

The overhead line winch 5 and the line car 7 are shown in FIG.
A pulling wire tension sensor 9 and a wire tension sensor 10 having the structure shown in FIG. 4 are provided. These sensors 9 and 10 are composed of, for example, a base 11, a load measuring section 12 installed thereon, and a hugging angle measuring section 13 similarly installed. The load measuring section 12 includes an inverted U-shaped support member 14, an inverted U-shaped sliding member 15 slidably supported inside the supporting member 14, and a pulley 16 rotatably supported by the sliding member 15. and a strain sensor 17 which is installed between the support member 14 and the sliding member 15 and receives the load of the overhead wire 1 which is in contact with the pulley 16 so as to hold it. The strain sensor 17 is a sensor that utilizes the phenomenon that magnetic distortion occurs when a load is applied, and is designed to obtain an amount of electricity proportional to the load V.

The embrace angle measurement unit 13 has a base end that serves as a fulcrum 18 at the base of the support member 14 , and a tilted member 20 that has a tip that contacts the overhead wire 1 via a rotating body 19 , and the fulcrum 18 . The inclined member 20 is arranged so that the tips of the teeth are on a circular arc orbit centered on the
The arc member 21 attached to the arc member 21 and the arc member 21
and a rotation angle sensor 22 that meshes with the rotation angle sensor 22.
The embrace angle θ of the overhead wire 1 is detected based on the rotation angle of the rotation angle sensor 22. The wire tension Td1 of the overhead wire 1 is expressed by Vx[1/{2sin(θ/2)}], although it also needs to be corrected depending on the direction in which the load V acts.

When nothing passes over the metal wheel 8 suspended from the steel tower 2, the suspension wire 31 naturally hangs down vertically. However, when the towing wire 3 is pulled over this metal wheel 8, the suspension wire 31 is pulled to the right in FIG. 2, that is, to the engine field E side, due to the pulling resistance. Furthermore, when the joint protector 4 passes this metal wheel 8, the metal wheel 8 is strongly pulled toward the engine field E side from the position shown by the solid line in FIG. 2 as shown by the two-dot chain line due to passing resistance. , this deflection angle α ₁ increases as the tension at the support point of the pulling wire 3 increases.

In this embodiment, we focus on the fact that the deflection angle α ₁ changes depending on the magnitude of the tension at the support point of the pulling wire 3, and it is determined based on the topography and other conditions among the many steel towers 2, for example, near the top of a mountain. As shown in FIG. 2, an inclination angle sensor 23 for detecting the deflection angle α ₁ is installed as a wheel tension sensor on the main body of the metal wheel 8 suspended from the main steel tower 2 where trouble is expected to occur. The magnitude of the detected deflection angle α ₁ and the magnitude of the support point tension TP1 of the pulling wire 3 for each tower 2, which is preset and input to the control device 24, are indirectly measured.

The inclination angle sensor 23 is, for example, disclosed in Japanese Patent Application Laid-Open No. 1986-
A method using a known principle as disclosed in Publication No. 249003 and the like is used. That is, when a conductive electrolyte is sealed in a hemispherical chamber provided on a substrate so as to form a bubble, and the substrate is tilted, the change in electrical resistance between the main electrode and the auxiliary electrode is caused by a bridge. A structure that can be detected by a circuit is used. (Not shown) However, the inclination angle sensor 23 in this embodiment is not limited to this, and may have any configuration as long as it can measure the deflection angle α ₁ .

As shown in FIG.
4 is provided, and the signal of the wire drawing tension Td1 is inputted to the control device 24 from the wire drawing tension sensor 10 of the drawing car 7 together with the signals of the wire drawing speed, the strip length, etc. The preset wire extension tension Td2, the set pulling wire tension Td2, and the preset deflection angle _α2 for each main tower 2 are input to the control device 24. The set wire extension tension Td2, the set pulling wire tension Te2, and the set deflection angle _α2 for each tower 2 are calculated based on various factors and are set as a range in which the overhead line work can proceed safely for each main tower 2. determined each time.

Information such as the wire extension speed, length, pulling speed, overhead wire angle at each tower, and work time for overhead wire work is input to the control device 24 along with the tension, swing angle, etc. A display 25 and a printer 26, which serve as display means, provide a digital display or, in some cases, an analog display.

Furthermore, the drum field D has a telemeter master station 2.
Telemeter slave stations 28 and 29 are installed at each of the main towers 2 and the engine station E, and the pull wire tension sensor 23 has a control device 24, a telemeter master station 27, and a telemeter slave station. The stations 28 and 29 are connected by a communication line 32. In FIG. 5, only one main steel tower 2 and one telemeter slave station 28 are shown, and the others are omitted. When the joint protector 4 passes the metal wheel 8 of each main tower 2, an analog signal with a deflection angle α ₁ is input from the inclination angle sensor 23 to the telemeter slave station 28 attached to each main tower 2, The signals are sequentially input to the telemeter master station 27 as digital signals. Note that power is supplied to the telemeter slave station 28 from a generator 30.

At the engine station E, the towing wire tension Te is detected from the towing wire tension sensor 9 of the overhead line winch 5.
1 analog signal is input to the telemeter slave station 29 together with information such as towing speed.

Then, the information is transmitted from the telemeter slave station 29 to the telemeter master station 27 as a digital signal using the communication line 32, and the control device 24 transmits the telemeter to the actuator (not shown) of the overhead line winch 5. A rotation speed control signal including rotation start and stop is transmitted via the master station 27 and the telemeter slave station 29. Therefore, the communication line 32 is composed of a measurement communication line and an automatic control communication circuit.

The operation and effect of this embodiment constructed as described above will be described. First, the tow wire 3 is placed on the steel tower 2 between the drum station D and the engine station E in a remote location by a known method. Then, an overhead wire 1 pulled out from a wire extension car 7 is connected to the rear end of the towing wire 3 via a joint protector 4, and the tip of the towing wire 3 is wound around an overhead wire winch 5.

The control device 24 has a set wire extension tension Td2, a set deflection angle _α2 for each main tower 2, and a set pulling wire tension.
Te2 is input.

Next, when the overhead wire winch 5 is driven and starts winding the towing wire 3, the overhead wire 1 is extended from the wire extension vehicle 7. Then, the overhead wire 1 passes successively through the metal wheel 8 suspended from the steel tower 2, and the wire extension work to the main steel tower 2 is performed in the same manner as before. When the joint protector 4 connecting the rear end of the tow wire 3 and the tip of the overhead wire 1 passes the metal wheel 8, the joint protector 4 is thicker than the tow wire 3, so the passing resistance increases rapidly. The metal wheel 8 swings as shown by the two-dot chain line in FIG. 2, and the tension Tp1 at the support point of the pulling wire 3 increases.

When the joint protector 4 reaches the main steel tower 2, the swing angle α ₁ of the metal wheel 8 is detected by the inclination angle sensor 23. This deflection angle α ₁ is transmitted from the telemeter slave station 28 to the telemeter master station 27, inputted to the control device 24, and displayed on the display 25.

The control device 24 compares and calculates the deflection angle α ₁ with a preset deflection angle α ₂ inputted in advance, and calculates the deflection angle α _{1 .}
is larger than the set deflection angle α ₂ , a control signal that reduces the towing speed by, for example, 50% for a predetermined period of time, for example, 1 to 30 seconds, is sent to the overhead line winch via the telemeter master station 27 and the telemeter slave station 29. Output for 5. At this time, the towing wire tension Tp1 of the overhead line winch 5 is controlled to become the set towing wire tension Tp2.

On the other hand, as the pulling speed decreases, the wire drawing tension Tp1 also decreases, so a control signal is output from the control device 24 to the wire drawing car 7 so that the wire drawing tension Td1 falls within the range of the set wire drawing tension Td2. controlled. Further, this control can also be performed manually while looking at the display 25.

While the rotational speed of the overhead line winch 5 is decreasing for a predetermined period of time, the joint protector 4
When the swing angle α ₁ becomes small, the overhead wire winch 5 is controlled to the normal towing speed again.

The above control is performed sequentially from the drum field D side toward the engine field E side every time the joint protector 4 passes the metal wheel 8 of the main steel tower 2. Therefore,
Hino's invention exhibits an excellent effect in that the joint protector 4 can suppress the runaway phenomenon when passing the metal wheel 8, and can safely proceed with overhead line construction.

The present invention is not limited to the embodiments described above, and can be modified as appropriate within the scope of the technical idea of the present application, such as installing the control device 24 and the telemeter master station 27 at the engine station E.

Effects of the Invention As detailed above, the present invention indirectly measures the tension at the support point when the joint protector passes the metal wheel from the deflection angle, and controls the working conditions according to the measurement results. Catenary line work can be carried out safely without causing the protector to run away. Furthermore, the sensor for measuring the deflection angle is attached to the metal wheel, but since it is a small measuring device, the weight of the metal wheel does not increase or increase in size, and it has the excellent effect of being easy to transport and attach to the steel tower. demonstrate.

[Brief explanation of drawings]

Figure 1 is a schematic explanatory diagram showing the state of overhead lines in remote areas;
FIG. 2 is a perspective view showing the swinging state of the metal wheel, FIG. 3 is a side view of the tension sensor, FIG. 4 is a front view thereof, and FIG. 5 is a schematic explanatory view of the embodiment with some parts omitted. 1... Catenary line, 2... Steel tower, 3... Traction wire,
4... joint protector, 5... catenary winch, 7... wire extension car, 8... metal wheel, 9... towing wire tension sensor, 23... metal wheel tension sensor, 24...
...Control device, 25...Display as display means, 26...Printer, 31...Suspension wire, D...Drum field, E...Engine field, Tp1
... Pulling wire tension, Tp2... Pulling wire support point tension.

Claims (1)

[Claims] 1. Overhead line 1 extended from the extension car 7 of drum field D
A tow wire 3 for towing the cable through a joint protector 4 is wound around a catenary winch 5 at an engine station E, and is used to extend a catenary line 1 between a number of steel towers 2 installed at two remote locations. In the device, the tow wire tension Te1 when the tow wire 3 is wound around the overhead wire winch 5 in the engine station E;
A pull wire tension sensor 9 detects the above-mentioned drum field D and the engine field E, and the wire tension sensor 9 is attached to a metal wheel 8 suspended from the main steel tower of the steel towers 2 installed between the drum field D and the engine field E. When the int protector 4 passes, the tension of the metal wheel detects the magnitude of the deflection angle α ₁ of the metal wheel 8 that swings in response to the magnitude of the pulling wire support point tension Tp1 applied to the pulling wire 3 on the tip side of the overhead wire 1. The sensor 23 compares and calculates the magnitude of the deflection angle α ₁ with the preset deflection angle α ₂ for each main tower, and calculates the tension at the support point of the tow wire indirectly from the magnitude of the deflection angle α ₁ .
In addition to calculating the strength of Tp1, the calculated pull wire support point tension Tp1 is compared with the set pull wire support point tension Tp2 for each main tower that has been set and input in advance, and the former tension is determined by the latter. When the pulling wire tension Te is greater than the tension Te
The overhead line winch 5 sends a control signal to control the towing speed to pull the tow wire 3 while maintaining the tow wire 3 within the range of the set tow wire support point tension Tp2.
A communication line 32 disposed between the towing wire tension sensor 9, the metal wheel tension sensor 23, and the control device 24.