JP2017107362A - Iron tower operation monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron tower operation monitoring system capable of surely monitoring a position of an operator during the operation of a power transmission line at an iron tower.SOLUTION: An iron tower operation monitoring system for monitoring an operator operating at an iron tower 100, includes: operator wireless devices 10and 10carried by the operator and transmitting electric waves as position signals; a position detection wireless device 20installed around the iron tower 100and, for example, receiving the position signals from the operator wireless device 10by an A antenna 21A and a B antenna 21B, detecting an incident direction of these position signals from phases of these position signals, and transmitting the position detection signals showing the detected incident direction; and monitoring device 30 for receiving the position detection signals from the position detection wireless device 20and specifying the position, on the iron tower 100, of the operator carrying the operator wireless device 10based on the incident direction shown by the position detection signals.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tower work monitoring system for monitoring whether a worker who works on a tower is on the tower.

  When a failure occurs in the transmission line, a protective relay is activated to cut off the transmission line and cut off the transmission line. In addition, failures caused by natural disasters such as lightning are temporary and are likely to be resolved with time. For this reason, after a predetermined time has elapsed since the power failure of the power transmission line, power transmission is resumed by the automatic restoration device including the reclosing device.

  In addition, when a worker performs live-line proximity work on a steel tower for recovery in the event of a transmission line failure, the person in charge of maintenance at the control station locks the automatic recovery device and automatically transmits power. The worker does the work after preventing it from being resumed. Then, after completion of the work, the person in charge at the control center releases the lock of the automatic recovery device so that the automatic recovery device can automatically transmit power and resume power transmission.

  Here, when the person in charge at the control center unlocks the automatic recovery device, there is a risk of electric shock if there are workers on the tower, so all workers must get off the tower. It is. At present, information that is confirmed visually by the person in charge of the work at the work site is communicated to the control center by telephone or wirelessly. At the control station, the person in charge who received the notification releases the lock of the automatic recovery device. For this reason, there is a possibility that human errors such as confirmation mistakes and report mistakes at the work site may occur.

  As this solution, there is the following system (for example, refer to Patent Document 1). This system manages workers in the field close to the hazardous area. For this purpose, this system includes an IC tag possessed by an operator, a fixed sensor device that acquires data from the IC tag, and a management personal computer that transmits and receives data to and from the sensor device. Then, the management personal computer receives data from the sensor device, acquires the three-dimensional arrangement data of the IC tag, and specifies the position of the IC tag.

  With such a system, the location of workers on the tower is managed even from a remote location.

JP 2007-52671 A

  However, the following problems remain in the system described above. That is, this system uses a detection method using an IC tag and a sensor device. However, in this detection method, detection is performed in a narrow range from the sensor device due to the characteristics of the IC tag. Therefore, in order to manage the position of workers on a huge structure such as a steel tower, it is necessary to install many sensor devices, which is not suitable for use on site. Furthermore, if the IC tag is separated from the sensor device, the position of the worker may be lost.

  An object of the present invention is to solve the above-described problems and provide a tower work monitoring system capable of reliably monitoring the position of a worker during work of a transmission line on the tower.

  In order to solve the above-described problems, the invention of claim 1 is a tower work monitoring system for monitoring a worker working on a steel tower, and is carried by the worker and transmits a radio wave as a position signal. The position signal from the apparatus and the radio apparatus for workers is received by each antenna, and the incident direction of the position signal is detected from the phase of these position signals, and the detected incident direction is represented. A position detection wireless device that transmits a position detection signal, and a worker who receives the position detection signal from the position detection wireless device and possesses the worker wireless device based on the incident direction represented by the position detection signal And a monitoring device for identifying the position of the steel tower in the steel tower.

  The tower work monitoring system according to the first aspect of the present invention monitors workers working on the tower. That is, the worker's wireless device of the tower work monitoring system is carried by the worker. Then, the worker radio device transmits radio waves as position signals. The position detecting wireless device is installed around the steel tower. The position detection radio apparatus receives the position signal from the worker radio apparatus by each antenna. Thereafter, the position detection wireless device detects the incident direction of the position signal from the phase of the position signal, and transmits a position detection signal representing the detected incident direction. The monitoring device receives a position detection signal from the position detection wireless device. Thereafter, the monitoring device specifies the position of the worker who has the wireless device for the worker on the steel tower based on the incident direction indicated by the position detection signal.

  According to a second aspect of the present invention, in the tower work monitoring system according to the first aspect, the monitoring device has the radio device for the worker within a restricted range that is set in advance in the tower and in which access is restricted. It is characterized in that it is specified whether there is a worker to perform, and when it is specified that this worker is present, it is displayed that the worker is within the restricted range.

  The invention according to claim 3 is the tower work monitoring system according to claim 2, wherein the monitoring device is connected to a control system that automatically restores a transmission line, and the wireless device for workers is held in the limited range. When it is determined that there is a member, a detection signal during climbing is transmitted, and the control system does not unlock the automatic recovery when receiving the detection signal during climbing from the monitoring device. And

  According to the first aspect of the present invention, it is possible to reliably monitor and grasp the situation where the worker is climbing up and down the steel tower by detecting the incident direction of the radio wave.

  According to the invention of claim 2, it is possible to alert the operator by displaying that the worker is within the limit range of the steel tower.

  According to the invention of claim 3, since the automatic recovery lock cannot be released unless the worker is outside the limit range, it is possible to prevent human error due to omission of confirmation or confirmation error for unlocking. Become.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the steel tower work monitoring system by Embodiment 1 of this invention. It is a block diagram which shows an example of the radio | wireless apparatus for workers. It is a block diagram which shows an example of the radio | wireless apparatus for position detection. It is explanatory drawing explaining the detection of the arrival direction of an electromagnetic wave. It is explanatory drawing explaining the detection of the arrival direction of an electromagnetic wave. It is a circuit diagram which shows an example of a lock control circuit. It is a block diagram which shows the steel tower work monitoring system by Embodiment 2 of this invention. It is explanatory drawing explaining the detection of the arrival direction of an electromagnetic wave.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
A steel tower work monitoring system according to this embodiment is shown in FIG. Tower work monitoring system of Figure 1 is configured to monitor the workers to work in such towers 100 ₁ and tower 100 _2. Here, briefly explained tower 100 _1. Tower 100 ₁ is provided with the column sections 101 extending upwardly, and each of the legs 102 for supporting the column sections 101. The structure formed by the pillar portion 101 is provided with a support portion 103 that supports a power transmission line (not shown). Further, a climbing prevention device 104 is installed on each leg 102. The climbing prevention device 104 has a structure that allows a worker to climb the tower so that a regular worker can maintain and inspect the power transmission line supported by the steel tower. At the same time, the climbing prevention device 104 is configured such that non-related persons other than workers cannot climb the tower. The climbing prevention device 104 is installed at a position higher than the average height of an adult.

Since towers 100 ₂ and other steel tower is the same as towers 100 _1, the description thereof is omitted. In the following, mainly described monitoring of working with tower 100 _1.

These towers 100 maintenance in tower containing ₁ or tower 100 _2, pylons work monitoring system used in the inspection, a wireless device for personnel including personnel radio apparatus ₁ and the personnel radio device 10 ₂ includes a position detecting radio apparatus including a position detection radio device 20 ₁ and the position detection radio device 20 _2, a monitoring device 30. Furthermore, the steel tower work monitoring system includes a lock control circuit provided in the control station. In FIG. 1, the lock control circuit is not shown. Further, one tower, for example with respect to tower 100 _1, and the wireless device for workers in accordance with the work force, the radio device 20 ₁ for detecting one position is used. Hereinafter, with respect to tower 100 _1, and the personnel radio device ₁₀ 1, 10 ₂ will be mainly described with the case of using a position detection radio device 20 _1.

Personnel radio apparatus ₁ is a portable communication device of the worker possessed. In this embodiment, the personnel radio apparatus ₁ is a rectangular parallelepiped shape, it is possible carrying the wireless _device 101 for operator suspended the worker, such as a belt, a strap. Wireless device 10 ₁ of the radio system for workers, it complies with suitable near field communication "IEEE802.15.4" wave transmission distance is about 100 m. Personnel radio apparatus ₁ according to "IEEE802.15.4" is low power consumption, since battery life is about 2 months, is suitable for use in situations that can not be charged or battery replacement. Furthermore, the personnel radio apparatus _1, since in compliance with "IEEE802.15.4", enabling the communication by the wireless device for 16 channels, i.e. 16 units workers.

An example of such personnel radio apparatus ₁ shown in FIG. Personnel radio apparatus ₁ includes a storage unit 11, a control unit 12, and a radio unit 13. Although not shown in addition to this, the wireless device 10 ₁ for personnel, storage unit 11, the control unit 12, a power supply for supplying electricity to the radio unit 13, on the power, such as a switch to turn off the I have.

The storage unit 11 stores identification information. This identification information is used to identify the workers to work in the steel tower 100 _1, is made from, such as numbers and letters. The wireless unit 13 performs wireless communication in accordance with the “IEEE802.15.4” standard under the control of the control unit 12. The wireless unit 13 uses a 2.4 GHz band radio wave (carrier wave).

  The control unit 12 controls the wireless unit 13 to intermittently transmit radio waves. The control unit 12 reads identification information from the storage unit 11 when transmitting radio waves. Then, the control unit 12 sends the read identification information and a transmission instruction for intermittently transmitting the identification information to the radio unit 13. As a result, the identification information is placed on the carrier wave and transmitted from the radio unit 13 as a position signal.

Or a wireless device 10 ₁ configured for workers. Another and personnel radio apparatus ₂ the worker to use, other personnel wireless device identification information stored in the storage unit 11 is only different other wireless devices for workers are the same as 10 _1, description thereof is omitted.

Position detection radio device 20 ₁ receives radio waves from such personnel radio apparatus ₁ and the personnel radio apparatus ₂ detects the operator position in tower 100 _1.

An example of such a position detection radio device 20 ₁ is shown in FIG. Position detection radio device 20 _1, the A antenna 21A and B antenna 21B installed in a rod-shaped supporting columns _{20 11} (FIG. 1), a processing unit 22 which is accommodated in the storage case _{20 12} (FIG. 1) And a communication unit 23.

Storage box _{20 12} is a box-like body is placed on the ground or the like, the supporting pillar _{20 11} is fixed to the storage case _{20 12.} At this time, the storage case _{20 12} is placed on the ground or the like, so as to protrude upward, the support pillar _{20 11} is fixed to the storage case _{20 12.} In this embodiment, the supporting pillar 20 ₁₁ is used by being placed from the center line C of the tower 100 at a distance L.

The support pillars _{20 11,} and the A antenna 21A and B antenna 21B is fixed apart by a predetermined distance. The A antennas 21A and B antenna 21B, the same surface of the support column _{20 11,} are arranged on the A antenna 21A. As mentioned earlier, the two antennas 21A, 21B, when placing the container box 20 ₁₂ the ground, in the upward direction relative to the ground, and is disposed on the support pillar 20 ₁₁ so as to be aligned in a straight line ing. Furthermore, in this embodiment, the heights of the A antenna 21A and the B antenna 21B are adjusted so that the midpoint between the A antenna 21A and the B antenna 21B is substantially the same height as the average adult height. ing.

  The longer the distance L described above, the smaller the error associated with the lateral movement of the worker, which will be described later, and each tower is set to be suitable for the terrain conditions. For example, when the flat place is narrow, it is installed near the legs of the steel tower, and when it is wide, it is installed far from the steel tower.

Further, the predetermined interval between the A antenna 21A and the B antenna 21B is set to the same interval as the wavelength of the radio wave (carrier wave) to be used. For example, in this embodiment, since wireless communication conforming to “IEEE802.15.4” is performed, if the frequency of the radio wave is 2.4 GHz, the predetermined interval between the A antenna 21A and the B antenna 21B is:
Wavelength λ = 300Mm / s ÷ 2400MHz ≒ 120cm
It becomes. That, A and antenna 21A and B antenna 21B, are disposed apart wavelength of the radio wave (carrier wave) (≒ 120 cm) in the supporting pillar _{20 11.} In the above calculation formula, 300 Mm / s is the speed of light.

Processing unit 22 of the position detection radio device 20 _1, the radio wave received by the A antenna 21A and B antenna 21B, based on the phase difference between the position signals transmitted from, for example personnel radio apparatus _1, the radio The direction of arrival is detected.

The processing unit 22 is an apparatus that analyzes the position signals received by the A antenna 21A and the B antenna 21B and detects the positions of the worker radio apparatuses 10 ₁ and 10 ₂ that have transmitted the position signals. The processing unit 22 includes, for example, an arithmetic device such as a central processing unit (CPU), a storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and a wireless device for workers. 10 ₁ and 10 ₂ are configured with a wireless module for performing wireless communication.

Storage processing unit 22 stores the identifier and location of each pylon including tower 100 ₁ is installed.

  The processing unit 22 has a function of detecting a position signal received by the two antennas 21A and 21B by the wireless module, that is, a phase difference between carrier waves, a function of detecting an incident direction of the position signal from the phase difference, and a received position. It has a function of decoding the identification information carried on the signal.

The processing unit 22 decodes the position signals received by the two antennas 21A and 21B by the wireless module, that is, the phase of the carrier wave, and detects the phase difference Δλ. And the process part 22 is the incident direction of a position signal,
Incident angle θ = Arcsin (Δλ / λ)
Calculate

Here, the detection of the arrival direction of the radio wave performed by the processing unit 22 will be described more specifically. 4, the A antenna 21A and B antenna 21B via the wireless module is an illustration of example when receiving the radio wave transmitting position signals from the personnel radio device 10 _1. First, the wavelength of the radio wave used here is 120 cm as described above. The A antenna 21A and the B antenna 21B are arranged at an interval of 120 cm, which is the same as the wavelength of the radio wave, in an upward direction and on a straight line with respect to the ground.

When the phase difference when the two A antennas 21A and B antennas 21B receive radio waves arriving from the direction indicated by the arrow is, for example, 60 cm, which is half the wavelength, the angle θ is
θ = Arcsin (60/120) = 30 °
It becomes. Here, the angle θ is equal to the incident direction of the radio wave with respect to the ground. Therefore, as shown in FIG. 5, the radio wave is incident from above 30 ° with respect to the horizontal direction (direction parallel to the ground) where the antenna is directed.

In this way, the processing unit 22, the personnel radio apparatus ₁ detects an incident direction θ of the radio wave to be transmitted. The processing unit 22 from the received position signals, reads the wireless _device 101 of the identification information for the operator. Thereafter, the processing unit 22 adds the identification name and location of each installed tower to the incident direction θ of the analyzed position signal and the identification information carried on the received position signal, thereby obtaining a position detection signal. The position detection signal is output to the communication unit 23.

  The communication unit 23 is a device having a communication function, and transmits the position detection signal received from the processing unit 22 to the monitoring device 30 via a wired or wireless communication network NW1.

Position detection radio device 20 ₁ is configured as described above. Since the position detection radio device 20 ₂ for use in a different tower 100 ₂ is the same as the position detection radio device 20 _1, the description thereof is omitted for position detection radio device 20 _2. The same applies to the position detecting radio devices used in other steel towers.

The monitoring device 30 is a computer such as a personal computer installed and managed in the office of an electric power company. The monitoring device 30 is connected to the position detection wireless devices 20 ₁ and 20 _{2 and the} like via a communication network NW1 (FIG. 1) in a wired or wireless manner.

  The monitoring device 30 has a function as a normal personal computer, for example, a storage function by a storage device such as a hard disk, a RAM, and a ROM, an arithmetic function by a CPU, a display function, and a communication function. Further, the monitoring device 30 has a position specifying function and an operator specifying function in addition to these functions.

The communication function of the monitoring device 30 transmits / receives signals to / from the position detection wireless devices 20 ₁ and 20 _{2 through} the communication network NW1. As a result, the communication function receives position detection signals transmitted by the position detection wireless devices 20 ₁ and 20 _{2 and the} like. As will be described later, the communication function transmits and receives signals to and from the control system 40 at the control station via the communication network NW2 (FIG. 1).

The worker identifying function of the monitoring device 30 stores the correspondence between the identification information and the workers, and identifies the name of each worker who possesses the worker wireless devices 10 ₁ , 10 _2, etc.

The position specifying function of the monitoring device 30 is a program task stored by the storage function and executed by the information processing function. Localization function, from the incident direction θ of the position detection signal communication function is transmitted is received from such position detection radio device 20 _1, 20 _2, for example, the position of the worker who carries the wireless _device 101 for operator Identify. Further, for example, it stores the distance L between the center line C (FIG. 1) and the position detection radio device 20 ₁ of the tower 100 _1. The same applies to other steel towers.

Here, the position is specified functions, are previously stored, for example, the distance L of towers 100 ₁ and the position detection radio device 20 _1, the direction of incidence theta, current workers carrying the wireless _device 101 for operator Identify the location. That is, the position detecting radio device 20 _1, if it is placed on the ground a distance L from the center line C of the steel tower 100 _1, the position of the worker who is on the center line C (height), H ≒ It is calculated | required by Ltan (theta). When the worker moves laterally from the center line C, an error occurs accordingly. Therefore, the position specifying function, taking into account the error estimated from the width of the steel tower 100 ₁ is identified by calculating the position of the worker as a constant range (position range). That is, on the steel tower 100 _1, worker and the distance movable laterally from the center line C is a, a (L-a) tanθ ≦ H ≦ (L + a) tanθ.

Also, the location capability, the tower 100 _1, when the transmission line worker entering a time of live-line state, there is a risk of accident such as electric shock, pre-set range of entrance is restricted as limited range Has been. Then, the monitoring device 30, the location capability, for example, when the operator carrying the personnel radio device 10 ₁ is identified as being in the limit range is identified as the operator is within the limits Information indicating this, that is, a detection signal during the climbing tower is generated.

  The display function of the monitoring device 30 includes a normal personal computer display. In this embodiment, the position range of the worker specified by the position specifying function is classified for each worker specified by the worker specifying function, and displayed on the screen so that the person in charge of contact can check. In particular, the display function draws attention by, for example, red characters and background colors.

Communication functions described above of the monitoring device 30, in addition to the identification name of the tower 100 ₁ and its location, the climbing in detection signal is information indicating that it has been identified as the operator is within the limits And transmitted to the control system 40 via the communication network NW2.

  The control system 40 is a system provided in a control station and set and managed by an electric power company. In particular, the control system 40 controls the protective relay to operate the circuit breaker, or operates the automatic recovery device after the power failure, in order to energize the power transmission line or perform a power failure. In this embodiment, in particular, there is an interlock function for restricting the unlocking of the automatic recovery device and preventing the power transmission line from automatically entering the energized state after a power failure.

Control system 40, be connected to the monitoring device 30 in the communication network NW2, sent from the communication function of the monitoring device 30, DN and the location of its towers 100 _1, the position range of the worker, within the limit Receive information about whether or not. Furthermore, the control system 40 receives information (detection signal during ascending tower) from the monitoring device 30 via the communication network NW2. Then, the control system 40, when climbing in the detection signal corresponding to the tower 100 ₁ is output, i.e. if there is a worker on the steel tower 100 _1, the soft interlock or lock control circuit, the automatic recovery device Prevent unlocking.

  An example of the lock control circuit provided in the control system 40 is shown in FIG. The lock control circuit shown in FIG. 6 includes a knot gate 41 and an AND gate 42. An ascending tower detection signal is applied to one input of the AND gate 42 via the knot gate 41. An unlock operation signal is applied to the other input of the AND gate 42. As described above, the ascending tower detection signal indicates that the worker is identified as being within the limit range, and is output from the monitoring device 30. The unlock operation signal is generated when a person in charge at the control center performs an unlock operation on the automatic recovery device.

  When the rising tower detection signal indicates that the worker is specified to be within the restricted range, that is, when the rising tower detection signal is at a high level, the knot gate 41 outputs a low level signal. As a result, the AND gate 42 prevents the other input, that is, the unlocking operation signal from passing therethrough. On the other hand, if it is specified that the worker is outside the limit range, the detection signal during the ascending tower becomes low level, and the knot gate 41 outputs a high level signal. Thereby, the AND gate 42 enables passage of the unlocking operation signal. That is, when the person in charge at the control center performs an unlock operation on the automatic recovery device, the AND gate 42 outputs a high-level unlock control signal to the automatic recovery device.

  Thus, the lock control circuit is configured by hardware. On the other hand, soft interlock is a lock control circuit configured by software.

  Next, the operation of the tower work monitoring system according to this embodiment will be described. When work is performed with a power failure in the power transmission line when a failure occurs in the power transmission line, the automatic recovery device of the control system 40 in the control center is locked so that the power failure state is automatically released and the power supply state is not entered. To do.

The work site, all workers, by possession of the personnel wireless device radio apparatus for 10 ₁ and the same worker that corresponds to the operator name, always position signal emitted from the wireless device for operator (worker an identification code is placed), for example, installed in a steel tower 100 ₁ and tower 100 _2, received by the a antenna 21A and B antenna 21B of the position detection radio device ₂₀ 1, 20 _2.

For example, the position detection radio device 20 _1, the phase difference between the position signal received by the A antenna 21A and B antenna 21B, and calculates the incidence direction θ of the position signal, the identification code further carried on the received location signals , together with the identification name and location of the tower 100 ₁ is installed, it transmits via the communication network NW1 to the monitoring device 30 in the office.

  In the monitoring device 30 in the office, the position specifying function specifies the position range of the worker based on the information received from the position detecting means, and the display screen is classified for each worker and displayed on the screen. Furthermore, when it is specified that the worker is within the restricted range, the monitoring device 30 alerts the user by making the characters and the background color red, etc., and uses the communication function to identify each tower's identification name and its location. Information on whether or not the worker is within the position range and the limit range (detection signal during climbing) is transmitted to the control system 5 via the communication network NW2.

  Based on the information received from the monitoring device 30 in the office, the control system 5 determines whether the position range is within the limit range or higher than the ground, that is, if there is a worker on the tower, The lock control circuit prevents the automatic recovery device from being unlocked.

  In this way, according to this embodiment, it is possible for the contact person in the office to always grasp and monitor whether or not the worker is on the steel tower with the monitoring device 30. In addition, according to this embodiment, the automatic recovery device cannot be unlocked unless all workers are off the tower or outside the limit range, thus preventing human errors caused by omissions or mistakes. It becomes possible to do.

  That is, according to this embodiment, it is possible for the person in charge of the contact to grasp the situation where the worker is climbing up and down the steel tower on the screen of the personal computer. Then, in cooperation with the control system 40 via the network, a soft interlock or lock control circuit that cannot perform the unlocking operation of the automatic recovery device is constructed unless all workers are off the tower. Enable human error prevention.

(Embodiment 2)
A steel tower work monitoring system according to this embodiment is shown in FIG. In this embodiment, components that are the same as or the same as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, for example, an A antenna 21A and B antenna 21B of the position detection radio device 20 ₁ are as follows. The A antennas 21A and B antenna 21B, is fixed to the supporting pillar _{20 11} spaced by a predetermined distance. The A antennas 21A and B antenna 21B, the same surface of the support column _{20 11,} are arranged on the A antenna 21A. Two antennas 21A, 21B, when placing the container box _{20 12} the ground, in the direction perpendicular to the ground, and is disposed on the support pillar _{20 11} so as to be aligned in a straight line. Furthermore, as in this embodiment, the height substantially the same as the height of the climbing prevention device 104 intermediate point is provided on the legs 102 of the tower 100 ₁ and the A antenna 21A and B antenna 21B, A The heights of the antenna 21A and the B antenna 21B are adjusted.

Processing unit 22 of the position detection radio device 20 _1, the radio wave received by the A antenna 21A and B antenna 21B, based on the phase difference between the position signals transmitted from, for example personnel radio apparatus _1, the radio The direction of arrival is detected.

  Similar to the first embodiment, the processing unit 22 has a function of detecting a position signal received by the two antennas 21A and 21B by the wireless module, that is, a phase difference between carrier waves, and based on the phase difference, the incident direction of the position signal And a function of decoding the identification information carried on the received position signal.

The processing unit 22 decodes the position signals received by the two antennas 21A and 21B by the wireless module, that is, the phase of the carrier wave, and detects the phase difference Δλ. And the process part 22 is the incident direction of a position signal,
Incident angle θ = Arcsin (Δλ / λ)
Calculate At this time, when the phase of the carrier wave received by the B antenna 21B is delayed compared to the A antenna 21A, the processing unit 22 sets the incident direction θ to plus (+ θ). As shown in FIG. 8, this state indicates that the carrier wave has arrived from above the climbing prevention device 104 (in the direction of arrow a) with respect to the installation positions of the A antennas 21A and 21B. Conversely, when the phase of the carrier wave received by the B antenna 21B is advanced compared to the A antenna 21A, the incident direction θ is set to minus (−θ). This state indicates that the carrier wave has arrived from below the climbing prevention device 104 (in the direction of arrow b), that is, from the ground side with respect to the installation positions of the A antennas 21A and 21B.

In this way, the processing unit 22, the personnel radio apparatus ₁ detects the arrival direction of the radio wave to be transmitted. The processing unit 22 from the received position signals, reads the wireless _device 101 of the identification information for the operator. Thereafter, the processing unit 22 adds the identification name and location of each installed tower to the incident direction + θ and incident direction −θ of the analyzed position signal and the identification information carried on the received position signal. The position detection signal is output to the communication unit 23.

  The communication unit 23 is a device having a communication function, and transmits the position detection signal received from the processing unit 22 to the monitoring device 30 via a wired or wireless communication network NW1.

The monitoring device 30 includes, from the position detection wireless devices 20 ₁ and 20 ₂ , the incident direction + θ and the incident direction −θ, identification information of the worker wireless devices 10 ₁ and 10 ₂ , and an identification name of the installed tower. When the location and location are received, the following processing is performed. That is, in this embodiment, the midpoint between the A antennas 21A and 21B is set as the reference height. Then, the monitoring device 30, for example, when the incident direction of the radio device 10 ₁ in the radio wave operator is + theta, and, when the incident direction + theta is larger than the incident direction + .theta.1 set in advance, worker to stay above the limit range, that climbing prevention device 104, it is determined that working in tower 100 _1. In this case, the monitoring device 30 sets the detection signal during climbing to a high level. Incident direction + .theta.1 is for the personnel radio apparatus ₁ sets the reliably higher position than the position of the climbing prevention device 104. Thus, workers carrying the wireless _device 101 for operator is detected that there at higher than the position of the climbing prevention device 104.

The monitoring device 30, when the incident direction of the radio device 10 ₁ in the radio wave worker is - [theta], and, when the incident direction - [theta] is smaller than the incident direction -θ2 which is set in advance, the work members than to stay below limits outside clogging climbing prevention device 104, it is determined that the end of work in the tower 100 _1. In this case, the monitoring device 30 sets the detection signal during climbing to a low level. Incident direction -θ2 are those personnel radio apparatus ₁ sets the strictly lower position than the position of the climbing prevention device 104. Thus, workers carrying the wireless _device 101 for operator is detected that there at lower than the position of the climbing prevention device 104.

Monitoring device 30, in addition to the identification name of the tower 100 ₁ and its location, the climbing in detection signal is information indicating that it has been identified as the worker is within limits, via the communication network NW1 Transmit to the control system 40.

  As in the first embodiment, the control system 40 prevents the automatic recovery device from being unlocked by the rising tower detection signal.

  According to this embodiment, as in the first embodiment, it is possible for the person in charge of contact to grasp the situation where the worker is climbing up and down the steel tower on the screen of the personal computer. In addition, according to this embodiment, the location higher than the installation position of the climbing prevention device 104 is within the restricted range and the location lower than the position of the climbing prevention device 104 is out of the restricted range, thereby Is determined to be out of the limit range, and if the worker is out of the limit range, the automatic recovery device cannot be unlocked. As a result, it is possible to prevent human error due to insufficient confirmation.

10 _1, 10 ₂ personnel radio device 11 storage unit 12 control unit 13 radio unit ₂₀ 1, 20 ₂ for position detection radio device 20 ₁₁ support pillar 20 ₁₂ storage box 21A A antenna 21B B antenna 30 monitoring device 40 controls system 100 DESCRIPTION OF SYMBOLS ₁ , 100 ₂ Iron tower 101 Column part 102 Leg part 103 Support part 104 Ascending tower prevention apparatus

Claims (3)

A tower work monitoring system for monitoring workers working on a tower,
A wireless device for workers that is carried by workers and transmits radio waves as position signals,
Position detection signal that is installed around the steel tower, receives position signals from the radio equipment for workers by each antenna, detects the incident direction of this position signal from the phase of these position signals, and represents the detected incident direction A position detecting wireless device for transmitting
A monitoring device that receives a position detection signal from the position detection radio device, and based on an incident direction represented by the position detection signal, specifies a position of the worker who possesses the worker radio device in the steel tower,
A tower work monitoring system characterized by comprising: The monitoring device specifies whether there is a worker who has the wireless device for the worker in a limited range that is set in advance in the steel tower and is restricted from entering, and specifies that the worker is present If this is the case, indicate that this worker is in the restricted range,
The steel tower operation monitoring system according to claim 1. The monitoring device is connected to a control system that automatically restores the transmission line, and when it is determined that there is a worker who owns the wireless device for the worker in the restricted range, a detection signal during climbing is transmitted. ,
When the control system receives a detection signal during ascending tower from the monitoring device, it does not unlock automatic recovery,
The tower work monitoring system according to claim 2, wherein:

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