JP6970158B2 - Cable laying method in the pipeline - Google Patents

Description

The present invention relates to a method of laying a cable from one manhole to the other manhole at a certain distance in an underground pipeline.

In the conventional underground transmission line pipeline pull-in, the worker communicates with the operation of the drum side wire extension car and the far end side winch car with a certain length away by radio or wire, and the wire draw speed and pull-in tension are adjusted. We are pulling in while managing.

However, in the conventional method, it is troublesome to operate the drum side extension wheel and the far end winch wheel while communicating with a plurality of workers. Therefore, a more automated cable laying method has been developed when laying cables in such a fixed length pipeline.

When laying the cable in the pipeline, a holing machine that sends the cable pulled out from the drum into the pipeline and a winch for winding the wire for pulling the wire attached to the tip of the cable are used. When pulling a cable, "cable pulsation" occurs due to friction between the cable and the inner surface of the pipeline, and "expansion and contraction of the cable or wire" occurs when pulling a stranded cable. Therefore, it is not enough to simply make the pushing speed of the halling machine the same as the winch speed.

In Patent Document 1, a transfer device for sending a cable having a wire connected to the tip thereof is installed on one side of a cable laying route such as a pipeline or a cave, and a traction device for pulling the wire at the tip of the cable. Is installed on the other side of the cable laying route, and the transfer device sends the cable to which the wire is connected to the tip from one side of the cable laying route, and the traction device pulls the wire at the tip of the cable from the other side. It is a method of laying a cable that can prevent the pulsation of the cable even if the elongation of the wire increases due to the fluctuation of the frictional force between the cable and the cable laying route. The difference between the frictional force and the traction force of the traction device is detected as the load torque value of the transfer device, the detected load torque value is transmitted to the traction device, and the traction device of the traction device is transmitted according to the load status of the transfer device. This is a cable laying method in which a cable is laid along a laying route while keeping the tension of the wire at a set value by adjusting the torque.

According to this method, the load torque of the transfer device is transmitted to the traction device side, thereby adjusting the traction force of the traction device. Therefore, the tension applied to the wire is always in a stable state, and therefore, the wire is in a stable state. The pulsation phenomenon of the cable that has occurred due to expansion and contraction is suppressed.

Further, Patent Document 2 is a cable insertion method for drawing various cables such as optical cables into the pipeline of an existing pipeline buried under a road or the like, and is a cable insertion method on the cable insertion port side of the pipeline. While a feeding device that inserts the cable into the pipeline at a constant speed is provided, a traction device that winds the lead-in wire connected to the tip of the cable is provided on the cable outlet side of the pipeline. It has a control means for controlling the pulling speed of the pulling wire by the traction device with respect to the insertion speed of the cable by the pulling device. It is a cable insertion method that controls so that it does not become the following.

According to this, the pulling speed of the wire that pulls the tip of the cable is controlled to a constant speed or higher than the constant speed with respect to the insertion speed of the cable sent into the pipeline via the feeding device. In this case, the inconvenience that the cable causes a buckling phenomenon does not occur, and the situation where the cable cannot be inserted due to the buckling phenomenon can be solved.

Japanese Patent No. 3795994 Japanese Unexamined Patent Publication No. 2001-346309

In this way, when the cable enters the pipeline and the insertion length of the cable becomes long, the traction speed decreases due to the frictional force of the cable with respect to the pipeline. Therefore, it is conceivable to synchronize and control the speed of the cable feeding device and the traction speed. Therefore, if the speed of the traction device is increased to match the speed of the cable delivery device, if the traction device rotates the capstan in the engine and winds up the traction wire, the engine noise becomes louder when the rotation speed is increased. This becomes noise. If this cable laying work is done especially at night, there is a risk of complaints from neighbors.

In Patent Document 1, the load torque of the transfer device is transmitted to the traction device side, thereby adjusting the traction force of the traction device. The traction device rotates the capstan with the engine to rotate the traction wire. In the case of a winder, when the rotation speed is increased, the engine noise rises, which becomes noise.

This is also the same in Patent Document 2. In this case as well, the pulling speed (traction speed) of the wire that pulls the tip of the cable is controlled to be constant or higher than the insertion speed of the cable that is sent into the pipeline via the feeding device. This leads to noise when increasing the traction speed.

On the other hand, as described above, if the traction speed of the traction device is lower than the delivery speed of the cable delivery device, the cable may be slackened and the cable may be damaged more than necessary. Therefore, when the slack sensor of the cable detects the slack, the speed of the cable sending device is rapidly decelerated, and after the detection of the slack sensor is canceled, the speed of the cable sending device is returned to the original (set speed) for operation. However, in this case, the looseness sensor frequently detects the looseness of the cable, and the speed of the cable feeding device must be reduced, and the frequency becomes high. Repeating such a temporary reduction in the speed of the cable feeding device many times puts a load on the cable to be laid, which is not preferable.

Therefore, in order to solve the above-mentioned problems, the present invention temporarily reduces the feeding speed of the cable feeding device, and then adjusts the speed according to the rate of decrease in the speed of the traction device without returning the speed to the original speed. The purpose is to provide a cable laying method in a pipeline that enables smooth cable laying without generating unnecessary noise and without imposing a load on the cable, and can be laid with a small number of workers. It was done.

According to the first aspect of the present invention, a cable feeding device is provided on the ground near the manhole at one end of a fixed-length pipeline buried in the ground, and a tow wire connected to the tip of the cable is pulled above the ground near the manhole at the other end. A device is provided, a cable is inserted into a pipeline from the cable feeding device through the manhole, the traction wire previously passed through the pipeline is pulled by the traction device through the manhole at the other end, and the cable connected to the traction wire is pulled. In the construction method of laying in a pipeline, the cable feeding device is operated in synchronization with the feeding speed of the cable feeding device, and when the slack of the cable is detected in the manhole on the cable feeding device side, the cable feeding device is fed. When the speed is temporarily reduced and the slack in the cable disappears, the sending speed of the cable sending device is restored, but the speed is reduced according to the rate of decrease in the traction speed of the traction device, and the cable is returned to the state where the speed is reduced. The cable laying method in the pipeline was adopted by repeating this every time slack was detected.

Further, according to the second aspect of the present invention, in order to detect the slack of the cable, a vertically horizontal sensor separated by a certain width is provided in the manhole on the side where the cable feeding device is provided, and the cable approaches the lower sensor. The cable laying method in the pipeline according to claim 1, which is configured to detect the cable slack / tension detection sensor when the cable slack / tension is detected.

Further, in the third aspect of the present invention, a tension meter is provided on the traction device side, and a monitoring camera for photographing the traction wire is provided in the manhole, and there is an abnormality in the measured tension values or an abnormality in the traction wire. In this case, the cable laying method in the pipeline according to claim 1 or 2, wherein the operation of the traction device and the cable delivery device is stopped.

Further, in the invention of claim 4, a monitoring control panel for controlling the operation of the cable feeding device and the traction device is provided, and the monitoring control panel detects cable slack, detects the tension value of a tension meter , speed, and length. The cable laying method in the pipeline according to any one of claims 1 to 3, wherein each detection of the measured value of (length) and the tension of the tow wire are monitored by the monitoring camera.

The invention according to claim 5 is to provide a lubricant coating device adjacent to the conduit entrance in the manhole on the side of the cable feeding device, and apply the lubricant to the outer periphery of the cable by the lubricant coating device. The cable laying method in the pipeline according to any one of 4 was adopted.

According to the first aspect of the present invention, as the laying distance of the cable into the pipeline becomes longer, a load is applied to the cable, which causes the traction speed of the traction device to decrease. Since the delivery speed is reduced each time slack is detected, the degree of difference between these speeds does not widen, and the frequency of cable slack detection is reduced. Therefore, the cable can be smoothly laid in the pipeline without imposing a load on the cable. Moreover, since the speed of the traction device is not increased more than necessary, the laying work can be performed without generating a large noise.

Further, according to the second aspect of the present invention, when the cable is detected by the lower sensor, it is found that the cable is loose, and the feeding speed of the cable can be reduced. Further, when the cable is detected by the upper sensor, it is found that the cable is tense, the cable feeding speed can be increased, and the cable feeding can be controlled in both cases.

Further, according to the third aspect of the present invention, since a tension meter is provided on the traction device side and a surveillance camera for photographing the traction wire is provided in the manhole, these data are stored in one place together with the slack detection data. Can be collected to control cable delivery and traction devices.

Further, according to the invention of claim 4, all the data of claim 3 can be sent to the monitoring control panel, and the cable feeding device and the traction device can be centrally controlled by the monitoring control panel according to these data. Operation control can be performed easily and reliably by the workers in the above.

Further, according to the invention of claim 5, since the lubricant is applied to the outer periphery of the cable to be sent into the pipeline and the cable is sent into the pipeline, the frictional resistance between the inner wall of the conduit and the outer periphery of the cable is reduced, and the cable is smooth. Can be laid.

It is a schematic block diagram of the whole apparatus used for the cable laying method in the pipeline of Embodiment 1 of this invention. It is a figure which shows the cable slack / tension detector used for the cable laying method in the pipeline of Embodiment 1 of this invention, (a) is a plan view, (b) is a front view, (c) figure. Is a side view. It is a flow chart of the automatic control of the halling machine, the winch used for the cable laying method in the pipeline of Embodiment 1 of this invention. It is a figure which shows the feedback control of the winch used for the cable laying method in the pipeline of Embodiment 1 of this invention, FIG. It is a graph which shows the relationship. It is a figure which shows the relationship between the speed control of the winch used for the cable laying method in the pipeline of Embodiment 1 of this invention, and (a) figure is the graph figure which shows the conventional control, (b). The figure is a graph which shows the control by this invention.

(Example 1 of the embodiment)
The schematic configuration of the whole apparatus used for the cable laying method in the pipeline of Embodiment 1 of this invention will be described with reference to FIG.

A holing machine 3 serving as a cable feeding device is provided on the ground near the manhole 2 at one end of the fixed-length pipeline 1 buried in the ground, and the cable 5 is provided on the ground near the manhole 4 at the other end of the pipeline 1. A winch 7 is provided as a traction device for pulling the traction wire 6 connected to the tip. The winch 7 is driven by an electric motor, and the winch 7 is controlled by the winch control panel 19. Further, although not shown, the winch 7 is provided with a terminal strip length detection sensor for the tow wire 6.

The cable 5 is fed from the drum 8 to the halling machine 3. The drum 8 is provided with a drum brake 9 that controls rotation. Further, a cable slack / tension detection sensor 10 and a lubricant coating device 11 are provided in the manhole 2. Further, although not shown, the halling machine 3 is provided with a sensor for detecting the feed length of the cable 5.

Further, in the manhole 4, a gold wheel 12 for hanging the tow wire 6 and leading it out toward the ground is provided, and the tow wire 6 is wound around the winch 7 via the gold wheel 12. Then, when the measured tension becomes 80% or more of the allowable range by the tension meter on the traction side, the operation of the winch 7 is stopped. Further, a camera 13 for photographing the traction wire 6 near the exit of the pipeline 1 is provided to photograph the traction situation. If there is an abnormality in the tow wire 6 photographed by the camera 13, the operation of the winch 7 is stopped.

The operating status data of the winch 7, the measurement data of the tension meter, the shooting data of the camera 13, etc. are collected in the winch control panel 19 provided near the winch 7, and the manhole 2 is collected via the communication unit 14 and the image transmission antenna 15. Sent to the side.

On the other hand, the halling machine 3 and the drum brake 9 are controlled by the monitoring control panel 16 provided on the manhole 2 side. Further, the output data from the cable slack / tension detection sensor 10 is also sent to the monitoring control panel 16. Further, the data sent from the image transmission antenna 15 on the manhole 4 side is received by the image transmission antenna 17 provided on the manhole 2 side, and this is collected in the monitoring control panel 16. In addition, the data collected on the monitoring control panel 17 can be displayed on the monitor 18.

The details of the cable slack / tension detection sensor 10 are shown in FIG. Two horizontal pipes 10b and 10b are assembled and fixed in a grid shape above and below two vertical pipes 10a and 10a that are erected vertically at regular intervals, and light source sensors 10c are provided on the lower surfaces of both ends of the upper horizontal pipe 10b. Further, light source sensors 10d are provided on the upper surfaces of both ends of the lower horizontal pipe 10b, respectively, and when the cable 5 is interposed between these pairs of light source sensors 10c or 10d, the light changes and detects this. A cover 10e is attached to each of the light source sensors 10c and 10d. Then, the pair of light source sensors 10c on the upper side detects the tension of the cable 5, and the pair of light source sensors 10d on the lower side detect the slack of the cable 5.

The device used for the cable laying method in the pipeline of the present invention has the above configuration, and the cable laying method using this device will be described below.

FIG. 3 shows an operation flow for automatic control of the entire device including the operation control of the halling machine 3.

First, the start button is pressed on the monitoring control panel 16 (S-1). Then, it is confirmed whether there is an error (S-2). If there is an error, the startup will be invalid (S-3). If there is no error, it is confirmed whether or not there is a cable slack detection output by the cable slack / tension detection sensor 10 (S-4). If there is, an error will occur and the startup will be invalid (S-5).

If there is no detection output, a start command is issued (S-6). As a result, the halling machine 3 is activated (S-7), and the winch control panel 19 receives this via radio (S-8) and activates the winch 7 (S-9). The winch 7 gradually accelerates to the initial stable speed, holds for a certain period of time after reaching the initial stable speed (S-10), and then gradually re-accelerates to reach the set speed (S-11). After receiving the start command, the winch control panel 19 checks whether there is an error (S-12), issues a stop command if there is an error (S-13), and stops the winch 7 (S). -14).

On the other hand, if there is no error, it is checked whether the winch speed is exceeded or insufficient (S-15). When these speeds are exceeded or insufficient, the speed (output voltage) is fed back to the winch control panel 19 (S-16). Then, the operating speed of the winch 7 is controlled to the set speed.

Further, the activated halling machine 3 maintains the initial stable speed (S-17), and then gradually accelerates to reach the set speed (S-18). After receiving the start command, the monitoring control panel 16 checks whether or not there is an error (S-19), issues a stop command if there is an error (S-20), and after a certain period of time, the halling machine 3 Is stopped (S-21). At the same time, a stop command is sent to the winch control panel 19, and when the winch control panel 19 receives the stop command (S-22), the winch 7 is stopped (S-14).

If there is no error in the error check (S-19), it is confirmed whether or not there is a cable slack detection output by the cable slack / tension detection sensor 10 (S-23). Then, when there is the detection output, the speed of the halling machine 3 is instantaneously accelerated or decelerated. After that, an offset is performed to reduce the set speed as described later (S-24).

If there is no output for detecting the slackness of the cable by the cable slack / tension detection sensor 10, it is checked whether or not the cable reaches the set length by the sensor or the like that detects the delivery length (S-). 25). If it has not been reached, the process returns to the error check (S-19). When the cable reaches the set length, a stop command for the halling machine 3 and the winch 7 is issued (S-20). As a result, the winch 7 is stopped (S-14, the halling machine 3 is also stopped (S-21).

In this way, the holing machine 3 sends the cable 5 from one manhole 2 into the pipeline 1, and the tow wire 6 connected to the tip of the cable 5 is pulled from the other manhole 4 through the gold wheel 12 by the winch 7 on the ground. However, as the laying of the cable 5 in the conduit 1 progresses, the tension increases due to the friction between the cable 5 and the conduit 1, and the winding speed of the winch 7 decreases.

When the speed of the winch 7 decreases, a speed difference with the halling machine 3 occurs, and the cable 5 repeatedly contacts the slack sensor of the cable slack / tension detection sensor 10 in the manhole 2. Further, as the length of the cable 5 becomes longer, the speed of the winch 7 decreases, so that the speed according to the set speed cannot be obtained.

In order to solve this problem, it was necessary to control the output voltage to the winch 7 to be gradually increased rather than constant. Therefore, the control of the winch 7 takes in the take-up speed information from the winch 7 as an analog input signal, monitors the speed information at regular intervals as shown in FIG. 4, and feeds it back to the output voltage so as to always approach the set speed. A function to apply is provided. This is shown in step (S-16) of FIG. This made it possible to suppress the speed reduction of the winch 7 to the maximum.

In this way, the output voltage feedback to the winch 7 can suppress the slowdown of the winch 7, but the output voltage to the winch 7 will eventually reach the maximum value, and when the voltage value reaches the maximum value, further feedback will be applied. This is not possible and the winch 7 slows down. Therefore, it is necessary to control not only the speed on the winch 7 side but also the speed on the halling machine 3 side.

Therefore, as shown in FIG. 5A, when the cable slack / tension detector 10 comes into contact with the slack sensor, the cable feeding speed by the holing machine 3 is temporarily reduced (about 2 seconds), and then the cable is sent out. Although it was returned to the original set speed, as shown in the figure, the winding speed on the winch 7 side gradually slows down, so the difference from the above feeding speed gradually widens, and the cable 5 comes into contact with the slack sensor. The number of times the delivery speed is temporarily reduced will increase. As a result, the cable 5 is frequently loaded, which is not preferable.

Therefore, as shown in FIG. 5B, when the cable slack / tension detection sensor 10 comes into contact with the slack sensor, the cable feeding speed by the halling machine 3 is temporarily reduced (about 2 seconds), and then the cable is sent out. Instead of returning to the original speed, it is returned to the speed obtained by multiplying the original speed by a certain value offset. This is shown in step (S-24) of FIG. That is, the feeding speed of the cable is lowered from the set speed and returned according to the decrease in the winding speed of the winch 7.

As a result, the difference between the speed of the winch 7 and the speed of the halling machine 3 does not widen, and as a result, the number of detections of the slack sensor is reduced, and the load due to the speed change on the cable 5 can be reduced as much as possible to lay the cable 5. became.

In the first embodiment, the speed of the winch 7 is observed when the slack of the cable is detected, and the speed of the holing machine 3 is reduced (offset) according to the decrease in the speed of the winch 7. However, at the speed of the winch 7. Instead, the speed of the holing machine may be gradually reduced (offset) in response to the increase in tension value. Also in this case, when the cable slack / tension detection sensor 10 detects the slack of the cable, the halling machine 3 is temporarily decelerated, and when the speed is returned to the original speed, the halling machine 3 is offset and returned to the original speed.

Further, in the first embodiment, the cable 5 is sent out into the pipeline 1 by the halling machine 3, but the cable feeding device is not limited to this, and the winch 7 is not limited to the winch. , It may be a traction device.

Further, in the first embodiment, the tension of the cable or the like is measured on the traction device side, but the tension meter can be provided in the manhole or near the winch 7 on the ground for measurement. Further, although the sensor for measuring the sending strip length of the cable 5 is provided on the halling machine 3 on the sending side, the strip length detecting sensor may be provided on the traction side of the winch 7 or the like.

Further, although the device is centrally managed by the monitoring control panel 16 in the first embodiment, the method of the present invention can be implemented without providing the monitoring control panel 16.

1 Pipeline 2 Manhole 3 Holling machine 4 Manhole 5 Cable 6 Tow wire 7 winch 8 Drum 9 Drum brake 10 Cable slack / tension detection sensor 11 Lubricating agent 12 Gold wheel
13 camera 14 communication unit
15 Image transmission antenna 16 Monitoring control panel 17 Image transmission antenna 18 Monitor 19 Winch control panel

Claims (5)

A cable feeding device is provided on the ground near the manhole at one end of a fixed-length pipeline buried in the ground, and a traction device for pulling a traction wire connected to the tip of the cable is provided on the ground near the manhole at the other end. In a construction method in which a cable is inserted into a pipeline from a device through the manhole, the traction wire previously passed through the pipeline is pulled by the traction device through the manhole at the other end, and a cable connected to the traction wire is laid in the pipeline. ,
The cable feeding device is operated in synchronization with the feeding speed of the cable feeding device, and when the slack of the cable is detected in the manhole on the cable feeding device side, the feeding speed of the cable feeding device is temporarily reduced. When the slack disappears, the feeding speed of the cable feeding device is restored, but the speed is reduced according to the rate of decrease in the traction speed of the traction device, and this is repeated every time the cable slack is detected. Cable laying method in the pipeline, which is characterized by doing. To detect the slack of the cable, a horizontal sensor is provided vertically and vertically separated by a certain width in the manhole on the side where the cable feeding device is provided, and the cable slack / tension is detected when the cable approaches the lower sensor. The cable laying method in a pipeline according to claim 1, wherein the cable is configured to be detected by a detection sensor. A tension meter is provided on the traction device side, and a surveillance camera for photographing the traction wire is provided in the manhole. The cable laying method in a pipeline according to claim 1 or 2, wherein the operation of the device is stopped. A monitoring control panel that controls the operation of the cable feeding device and the traction device is provided, and the monitoring control panel detects cable slack, detects the tension value of the tension meter , detects the speed and the measured value of the strip length , and monitors the camera. The cable laying method in a pipeline according to any one of claims 1 to 3, wherein the tension of the tow wire is monitored in the above. One of claims 1 to 4, wherein a lubricant coating device is provided adjacent to the conduit entrance in the manhole on the side of the cable delivery device, and the lubricant is applied to the outer periphery of the cable by the lubricant coating device. Cable laying method in the pipeline described in.

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