JP2000184082A - Monitoring system for construction site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring system for a construction site capable of independently monitoring the respective places of the construction site in plural monitoring places by using video images and sound. SOLUTION: In order to monitor respective construction spots A1-BN independently of the monitoring places 2 and 3 by utilizing the private branch telephone cable 4 of the construction site, a private branch telephone line 41 for contact through telephone is established by using a private branch telephone exchange 51. Also, video signals for monitoring from cameras C1-DN for monitoring installed at the respective construction spots A1-BN are subjected to balanced pair cable video transmission to the required line of the private branch telephone line 42 by using a video changeover relay 82 inside composite data exchanges 8 and 9. Thus, monitoring information by the video images is also obtained in the respective monitoring places 2 and 3 by using the private branch telephone cable 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction in which the status of a plurality of construction sites distributed in a predetermined area can be independently monitored at a plurality of monitoring stations using video and audio. It relates to a site monitoring system.

[0002]

2. Description of the Related Art For example, in tunnel construction and various large-scale construction sites, there is a demand that the situation of a plurality of construction sites distributed in the construction area be independently monitored by a plurality of monitoring stations. There is.

As a conventional surveillance system that satisfies such demands, there is known a surveillance system in which an industrial camera, a coaxial cable, and a monitor television monitor an image of each construction site and each monitoring station on a one-to-one basis. . In general, work instructions, communication, and the like are performed using a construction telephone cable that is installed separately from the monitoring system.

[0004]

However, according to the conventional system in which each construction site and a plurality of monitoring stations are connected one-to-one using a coaxial cable, it is necessary to monitor the construction sites in order to monitor several locations. The same number of coaxial cables as the number of monitoring points must be laid between the station and the surveillance station, and in order to view surveillance video at another place, it is necessary to lay the same coaxial cable at the same place as above. There is.

Therefore, according to the conventional system, it is necessary to lay the coaxial cable over a considerable distance, which increases the cost. In addition, if the coaxial cable is accidentally cut off during construction, it is necessary to connect and restore the coaxial cable. It has problems such as requiring a lot of trouble. Although it is possible to reduce the number of transmission cables by using a special camera or a configuration employing a transmission method, there is a problem in terms of cost.

Furthermore, since the monitoring video in the conventional system transmits the NTSC television signal directly using a coaxial cable, it cannot cope with long-distance transmission without being used, and is limited to a relatively short distance. It also has another problem of getting lost.

In addition, when a conventional video surveillance system is adopted, work communication is performed using a separately provided telephone line for construction. The problem that it takes time to collect detailed information in the communication, and in this type of monitoring system, the selection of the monitoring location is usually performed by manually operating a changeover switch and the like, and there are many monitoring locations. In such a case, switching is troublesome, and there is also a problem that it is not possible to respond to a request to grasp the state of a desired construction site from anywhere because it does not correspond to remote automatic switching. .

An object of the present invention is to provide a method for overcoming the above-mentioned problems in the prior art, in which monitoring of various parts of a construction site is performed independently at a plurality of monitoring stations using video and audio. It is an object of the present invention to provide a construction site monitoring system capable of performing such operations.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses a telephone cable at an existing construction site to transmit video and audio or measurement data in addition to the video and audio data. In order to be able to independently monitor each construction site from multiple monitoring stations without providing a transmission line, the telephone cable laid in advance at the construction site will be used for video transmission in addition to audio transmission It is like that. That is, the private branch exchange (PB)
X), a telephone line for telephone communication between each construction site and a plurality of monitoring stations can be established by a telephone cable, and a communication from a monitoring camera device installed at each construction site can be established. The monitoring video signal is transmitted as a baseband signal to a required telephone line by using a video switching relay without passing through the private branch exchange, thereby enabling monitoring information by video at each monitoring station using the existing telephone cable. Is also obtained.

According to the first aspect of the present invention, at a construction site where a local telephone cable for telephone communication between a plurality of construction sites and a plurality of monitoring stations is laid, an arbitrary construction site is provided from each of the monitoring stations. A monitoring system for a construction site, which can be independently monitored by video information, wherein an exchange connected via the telephone line of the monitoring station and the telephone cable, and monitoring of the construction site A monitoring camera device provided at each of the construction sites to obtain images, and a monitoring television provided at each of the monitoring stations for monitoring the construction sites and connected to a corresponding video transmission telephone line in the telephone cable. A video signal for transmitting a video signal for monitoring from the surveillance camera device to a required one of the video transmission telephone lines on a balanced-to-cable video basis. A transmission / switching device, an information selector provided at each of the monitoring stations for transmitting a selection signal for switching control in the video transmission / switching device to the exchange via the telephone line, and responding to the selection signal. There is proposed a construction site monitoring system including a switching modem and a control modem device provided between the exchange and the video transmission / switching device for switching control of the video transmission / switching device.

Each monitoring video signal for monitoring obtained by each monitoring camera device is converted into a monitoring video signal in an existing telephone cable by a video transmission / switching device that operates in response to a selection signal from an information selector. A balanced pair cable video transmission is performed via a required telephone line for signal transmission. Therefore, at an arbitrary monitoring station, a monitoring video signal from a monitoring camera device installed at a desired construction site can be selectively captured via a video transmission / switching device, and the monitoring video is viewed by a monitoring television device. be able to.

In this case, the telephone at the monitoring station can be easily connected to the telephone installed at the desired construction site by the exchange, so that more efficient monitoring can be realized with the video and the audio.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system configuration diagram showing an example of an embodiment of a construction site monitoring system according to the present invention.
The construction site monitoring system 1 includes construction sites A1,..., AN and B1,.
This is a system for monitoring BN using video and audio at a plurality of monitoring stations 2 and 3 provided at appropriate locations. Although the number of monitoring stations is two in the present embodiment, the number of monitoring stations can be any number, and the monitoring stations are always fixed because they move with the movement of the construction site. Do not mean.

Reference numeral 4 denotes a premises telephone cable laid in advance for telephone communication between the monitoring stations 2 and 3 and the construction sites A1 to AN and B1 to BN. Is used as the private telephone line 41, and part or all of the remaining private telephone line 42 is used for transmitting the monitoring video signal. The private telephone line 41 is connected to a private telephone exchange 51 installed in the office 5, and the monitoring stations 2 and 3 are connected to the private telephone exchange 51 via the private telephone line 41. On the other hand, PHS antennas 61 to 6N and 71 to 7N installed at construction locations A1 to AN and B1 to BN, respectively.
Is connected to the private telephone line 41 via a small exchange in the complex data exchanges 8, 9 described later. As a result, the local telephones 2 installed in the monitoring stations 2 and 3, respectively.
By using the PHS telephones (not shown) used at 1, 31 and each construction site, it is possible to make a telephone call with a desired partner.

The construction sites A1 to AN and B1 to BN
Surveillance cameras C1 to CN and D1 to DN for obtaining monitoring images of the corresponding construction sites are installed, and NTSs from the surveillance cameras C1 to CN and D1 to DN are provided.
The video signals for monitoring by the C system are transmitted to corresponding video balanced transmitters E1 to EN and F for relay transmission in baseband.
1 to FN, and the video balanced transmitters E1 to EN and F
From 1 to FN, the monitoring video signal converted to the baseband signal is transmitted to the composite data exchanges 8 and 9 by a balanced pair cable. Thus, the video balanced transmitter E1
-EN and F1-FN convert the video signal for surveillance by the NTSC system into a baseband signal of 110Ω, 1.2VP-P, thereby transmitting the video signal for surveillance using a normal telephone cable used at the construction site. Becomes possible.

On the other hand, surveillance cameras C1
, And information selectors 22 and 32 for selecting a desired monitoring video signal among the monitoring video signals obtained by D1 to DN, and for displaying a monitoring video based on the selected monitoring video signal. Surveillance televisions 23 and 33 are provided.

FIG. 2 is a block diagram showing the configuration of the complex data exchange 8. The composite data exchange 8 includes a small exchange 81 for exchanging and connecting each output signal of a private telephone, a PHS telephone, and a modem device for measurement data. In the illustrated example, a plurality of private telephones TEL installed in each of the construction sites A1 to AN shown in FIG.
A plurality of PHS antennas 61 to 6N and modems (modulators / demodulators) MD1 to MDN for transmitting and receiving measurement data from a measuring instrument not shown in FIG. The office line is connected to a private telephone line 41 via a telephone line 43. This small exchange 8
1 allows arbitrary telephone communication between the construction sites A1 to AN and the monitoring stations 2 and 3. As described above, by connecting the modems MD1 to MDN to the extension side of the small exchange 81, digital data transmission of various measured data becomes possible.

Reference numeral 82 denotes a video switching relay, on the input side of which are provided video balanced receivers 851 to 85N.
As described above, the video signals for monitoring of the NTSC system from the monitoring cameras C1 to CN are transmitted from the video balanced transmitters E1 to E as described above.
The signal is converted into a baseband signal by N and supplied to the input side of the composite data exchange 8 by balanced-to-cable video transmission. The video balanced receivers 851 to 85N transmit the monitoring video signal sent by balanced pair cable transmission to NT again.
The video signal is converted into a monitoring video signal by the SC system and input to the video switching relay 82. On the other hand, the output side of the video switching relay 82 is connected to the local telephone line 42 via the video balanced transmitters 831 to 83N, and the NTSC monitoring video signal obtained from the video switching relay 82 is again transmitted to the baseband signal. And sends it to the local telephone line 42. The monitoring video signal sent to the monitoring station 2 or 3 by the balanced-to-cable video transmission via the local telephone line 42 is converted again by the video balanced receivers 24 and 34 into the monitoring video signal of the NTSC system, and the corresponding video signal is monitored. Surveillance TV 2
3 and 33 are input. Thus, the video switching relay 8
2 and the video balance transmitters 831 to 83N
A video transmission / switching function of transmitting a video signal for monitoring transmitted from the monitoring cameras C1 to CN of the 1 to AN to a required line of the private telephone line 42 on a balanced-to-cable video basis. As the video switching relay 82, for example, a device commercially available under a name such as "video matrix switch" can be used.

A control modem 84 so that the video switching relay 82 can control switching so that a required monitoring video signal is sent to a desired line of the private telephone line 42.
Is provided. The control modem 84 is a small exchange 8
In response to the control signal CS from 1, the switching operation of the video switching relay 82 is controlled so that a required monitoring video signal is transmitted to a required line of the local telephone line 42 in accordance with the content of the control signal CS. The operation of the control modem 84 will be described later in detail.

The configuration of the composite data exchange 8 has been described above. The other composite data exchange 9 has the same configuration as the composite data exchange 8. Therefore,
Detailed description of the configuration of the composite data exchange 9 will be omitted.

The above-described switching control of the video switching relay 82 in the complex data exchanges 8 and 9 is performed by performing a required operation from the information selectors 22 and 32 by dialing the private branch exchanges 21 and 31 of the monitoring stations 2 and 3. This is executed by transmitting the selection signal in the form of a dial signal.

As described above, the information selectors 22 and 32
This is a device for freely switching the surveillance video and voice communication destinations displayed on the surveillance televisions 23 and 33 at the surveillance stations 2 and 3, and is composed of a personal computer and a modem. The selection signal is recorded in a memory in the personal computer in advance. In advance, the complex data exchanges 8 and 9 are transmitted from the modem via the private telephone line 41.
Sent to The selection signal includes (1) the number of the complex data exchange (corresponding to the station number), (2) the extension number of the video switching relay,
(3) video data number, and (4) extension number of the destination of the voice or data, which are determined in advance for each construction site.

FIG. 3 shows an example of the content of the selection signal. However, the content of the selection signal is not limited to the example of FIG. 3 and can be determined appropriately.

FIG. 4 is a flowchart showing signal processing for transmitting a selection signal from a personal computer (not shown) in the information selector 22. Monitoring station 2 based on FIG.
In the case where the necessary monitoring video signal and audio signal are selectively connected from the following, first, when the hook is turned on in step S1, the modem in the information selector 22 is turned on.
Becomes When the number of the composite data exchange 8 is transmitted in step S2, the composite data exchange 8 is selected. When the video relay number corresponding to the desired construction site is transmitted in step S3, the video relay number is selected in the complex data exchange 8. When the video data number is transmitted in step S4, the required video signal for monitoring is selected by the video switching relay 82, and the video signal for monitoring selected via the required line of the local telephone line 42 is input to the monitoring television 23. You can watch the surveillance video of the required construction site. Step S5
When the OFF hook is set, the modem in the information selector 22
It becomes FF. When the hook is turned on in step S6, the modem is turned on. In step S7, when the communication partner number is transmitted, a voice or data communication destination is selected. In step S8, a call is made.
When the FF hook is performed, the modem is turned off.

The procedure for selecting a monitoring video signal from a desired construction site by the information selector 22 of the monitoring station 2 has been described above.
In the same way, the monitoring video signal from an arbitrary construction site can be selected and the monitoring video can be viewed on the monitoring television 33 by the method 2.

According to the construction site monitoring system 1, since each construction site can be monitored by video using the local telephone cable 4 already laid at the construction site, a new monitoring video signal transmission cable is used. There is no need to arrange
The introduction can be performed in a short time. As described above, since special wiring for monitoring a coaxial cable or the like is not required, cable costs can be reduced, and maintenance costs can be reduced because only telephone line maintenance is required.

Further, according to the construction site monitoring system 1, since the monitoring video of the required construction site and the voice communication can be selected in cooperation with each other, it is possible to accurately give instructions and communication even in a wide area. In addition, even when there are many monitoring points or monitoring stations on site, the configuration is simple, so that when a trouble occurs, it is possible to quickly respond. Further, since the system is based on the telephone cable 4 in the premises, it is possible to flexibly cope with an increase or decrease in the number of construction sites and monitoring stations on the site. As described above, according to the construction site monitoring system 1, it is possible to respond to various requests at the site, such as site monitoring by video, voice communication, and measurement data transmission.

Information selectors 22 and 3 provided at the monitoring station
2 can use a general personal computer at the site, so that it does not cause a rise in cost, and can also be used for remote monitoring via the Internet or the like.
As described above, since a required monitoring location can be selected by using a personal computer, even a site where there are many monitoring locations and measurement locations can be operated without a doubt by simple operation.

[0030]

According to the present invention, as described above, the video of each construction site is monitored by using the local telephone cable already laid at the construction site. There is no need to arrange a transmission cable, and the installation can be performed in a short time. As a result, the cable cost can be reduced and the maintenance cost can be reduced because only the maintenance of the telephone line is required.

Also, since the monitoring video and the voice call of the required construction site can be selected in cooperation with each other, the instruction can be given even in a wide area.
Contact can be made accurately. And, since the configuration is simple, even when there are many monitoring points or monitoring stations in the field, it is possible to quickly respond when a trouble occurs. further,
Since the system is based on the telephone cable inside the premises, it can flexibly cope with the expansion and reduction of construction sites and monitoring stations on site. Therefore, it is possible to respond to various requests at the site, such as site monitoring, voice communication, and measurement data transmission.

The information selector provided at each monitoring station can use a general personal computer at the site.
In particular, it is possible to cope with remote monitoring via the Internet or the like without increasing the cost. As described above, since a required monitoring location can be selected by using a personal computer, even a site where there are many monitoring locations and measurement locations can be operated without a doubt by simple operation.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an example of an embodiment of a construction site monitoring system according to the present invention.

FIG. 2 is a block diagram showing a configuration of the complex data exchange shown in FIG.

FIG. 3 is a diagram showing an example of the content of a selection signal output by an information selector.

FIG. 4 is a flowchart showing an example of signal processing for transmitting a selection signal from a personal computer in the information selector shown in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 construction site monitoring system 2, 3 monitoring station 4 private telephone cable 5 office 8, 9 compound data exchange 21, 31 telephone 22, 32 information selector 23, 33 monitoring television 41 private telephone line 42 private telephone line 51 private telephone exchange 61-6N, 71-7N PHS antenna 82 Video switching relay 831-83N Video balanced transmitter A1-AN, B1-BN Construction site C1-CN, D1-DN Surveillance camera E1-EN, F1-FN Video balanced transmitter

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C054 BA02 CH08 DA09 EG02 EG08 HA01 HA18 5K048 BA00 DC07 EB15 5K051 AA05 BB05 CC08 CC14 DD03 EE07 GG06 5K101 KK13 LL01 MM02 MM07 NN06 QQ11

Claims (1)

[Claims] At a construction site in which a local telephone cable for telephone communication between a plurality of construction sites and a plurality of monitoring stations is laid, an arbitrary construction site from each of the monitoring stations is independently determined by video information. A monitoring system for a construction site capable of monitoring, comprising: an exchange connected to the monitoring station via a telephone line of the telephone cable; and a construction site for obtaining a monitoring image of the construction site. A monitoring camera device respectively provided in the monitoring station, a monitoring television device provided in the monitoring station for monitoring the construction site and connected to a corresponding video transmission telephone line in the telephone cable, A video transmission / switching device for transmitting a video signal for monitoring from each of the video transmission telephone lines to a required telephone line among the video transmission telephone lines on a balanced-to-cable video basis; An information selector provided at each of the monitoring stations for transmitting a selection signal for switching control in the video transmission / switching device to the exchange via the telephone line; and the video transmission / switching device in response to the selection signal. A monitoring system for a construction site, comprising: a control modem device provided between the exchange and the video transmission / switching device in order to control switching.