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With the rapid development of the country’s economy, my country’s tunnel construction is changing with each passing day. As urban subways, railway tunnels, and highway tunnels have improved route technical indicators, shortened distances and travel time, and increased operational efficiency, the country is constantly increasing the construction of tunnels; however, the construction cost of tunnels is high and the operation and management are relatively complicated. Therefore, all places attach great importance to the construction of tunnels and dare not take it lightly.
The current remote information management system is often only the management of administrative and technical documents, and cannot obtain construction information in real time, let alone a comprehensive, timely and accurate grasp of the information of the construction site and construction personnel, which leads to many accidents. . For this reason, governments at all levels attach great importance to the safety of production in engineering construction and adopt a series of measures to continuously strengthen safety in production. How to change the current lagging management mode of safety supervision during tunnel construction and realize the modernization, informatization, and intelligence of management has become an important topic for managers to study.
Therefore, advanced management methods such as disaster prevention, accident rescue, and information management will be an inevitable choice for the safe construction of tunnels. In response to the above situation, a “safety management (monitoring) system for tunnel construction personnel” is proposed, which provides a brand-new safety management concept and a strong guarantee for the safe construction of tunnels.
1 Excellent performance
★ High recognition reliability: 100% front-end recognition rate. As long as the construction personnel wear the 2.4G active radio frequency card correctly (unless it is broken), it can be read by a nearby card reader.
★ Long recognition distance (0-50 meters): It can reach a stable distance of 50M in the tunnel, and the information sent by the tag card within this range will be read.
★ Highly anti-collision: Each detection point can simultaneously identify up to 50 construction personnel’s information.
★ High recognition stability (error rate is less than one hundred thousandths), truly achieve no errors and no missing cards.
★ Fast recognition speed: the fastest recognition speed can reach 200 km/h, that is, it can recognize dynamic tag cards.
★ Two-way alarm function: the construction personnel can call the monitoring center through the label button; the monitoring center can also send information to the label. (The function of two-way card, one-way card does not have this function)
2 Convenient and wide application
In line with the existing network conditions of the tunnel, it can provide multiple tunnel-to-tunnel transmission methods based on optical fiber, Ethernet, communication cable, etc., which are highly adaptable and do not require high on-site environment, avoiding implementation difficulties and problems caused by a single transmission method. bottleneck.
3 High safety and stability
★ It has safe explosion-proof, dustproof and waterproof performance
★ High anti-interference, no special requirements for tunnel interference source and surrounding environment, strong environmental adaptability
★ The internal circuit is highly integrated, the device failure rate is minimized, and the operation is reliable
★ Using active identification card, no electromagnetic pollution, maintenance-free, safe to use
.4 Simple and convenient operation
★ The software has a full Chinese menu with a good operation interface
★ Integrated structure design of wireless monitoring sub-station, convenient and quick installation
★ The built-in battery of the identification card, ultra-low power consumption, no need for an external miner’s lamp power supply, no need to charge
★ The two-way card can replace the battery
5 Rich query and report functions
★ Query and report output, printing functions are simple and easy to operate
★ Inquire about the attendance information of construction personnel, departments and cadres
★ Inquire about the construction personnel’s movement trajectory
★ Various information reports can be output as required (such as: tunnel entry time report, personal attendance daily report, construction worker attendance monthly report, department attendance monthly report, etc.)
★ The real-time situation of the tunnel can be viewed remotely on any computer with Internet access, without the need to go to the scene. (Online version software function)
★ You can know at any time how many people there are in the cave, who are these people, and can be displayed on the LED display at the same time. The specific display content depends on the size of the display.
System composition, working principle and program introduction
The safety management (monitoring) system of tunnel workers mainly includes: video surveillance system, LED large-screen display system, alarm system for foreign non-card personnel, attendance positioning system, vehicle personnel access control system, etc.
1 Video surveillance system
Mines, subways, and tunnels are the country’s energy construction and infrastructure construction. During the construction process, a large amount of raw materials, such as cement, sand, and steel bars, are needed. Due to the poor site environment and the lack of management personnel, a large amount of raw materials were lost and a lot of waste of national resources. In view of the above situation, this problem can be solved by installing a video surveillance system. This system is also suitable for monitoring and managing personnel entering the tunnel and going down the well.
There are generally two ways of signal transmission in video surveillance systems: wired and wireless.
The general principles are as follows:
1.1 Wired mode: According to the distance between the camera or dome camera and the hard disk video recorder or computer, there are two ways to transmit signals:
a. If the distance between the camera or dome camera and the hard disk video recorder or computer is less than 500 meters, and the wiring is convenient, the video cable is used to transmit the signal, which is relatively low cost and easy to maintain.
b. If the distance between the camera or dome camera and the hard disk video recorder or computer is more than 500 meters, and the wiring is convenient, the optical cable is used to transmit the video signal, the cost is similar, and the maintenance is relatively difficult.
1.2 Wireless mode: If the camera or dome is far away from the hard disk video recorder or computer, and the wired mode is difficult, use this mode. This method has relatively high requirements on the stability of wireless transmission equipment. Moderate maintenance.
1.3 The composition and function of the video surveillance system:
The frequency monitoring system includes front-end video capture equipment, network video codec (wireless), WiFi wireless transmission equipment (wireless), and back-end monitoring and receiving client software. The former is installed at the main monitoring points of the tunnel to perform signal collection and transmission, and the latter software is mainly installed on the computer in the monitoring room. Monitoring and management. Such as: video, pan-tilt, zoom, recording, voice, alarm linkage and other functions, users with management rights can also set, download, and perform real-time on-demand video recording at any point; the system can also be monitored through a PC browser .
It can be seen that the wireless network monitoring system uses surveillance cameras for 24-hour real-time monitoring of various video points on the tunnel construction site. For some key video points, the video motion detection function and alarm function can be activated. The system automatically recognizes, triggers, and records according to the image movement (there is a pre-recording mechanism, and the pre-recording time can be advanced by more than 20 seconds); at the same time, the system will image, Real-time data such as sound and alarm are transmitted to the computer desktop of the monitoring room. The manager can freely switch the video of any front-end monitoring point through local monitoring, remote IE monitoring, WEB web client and other methods, and can intuitively understand and grasp the construction video monitoring points The real-time situation, so as to achieve timely and accurate supervision of it anytime, anywhere.
The video capture and transmission equipment in this system mainly uses spherical pan-tilt cameras.
Through the video monitoring system, you can grasp the construction situation in the tunnel in time in the monitoring room. In addition, even if you are not on the construction site, you can realize real-time monitoring and management of the site through remote monitoring, and cooperate with the video capture function.
2 LED large screen display system
The large LED screen is installed near the tunnel entrance to display the information of the construction personnel in real time, so that the management is advanced and transparent. The displayed content includes: tag number, name, time, total number of people, etc., so that leaders and supervisors do not need to enter the tunnel or check the computer in the monitoring room to know the situation of the tunnel construction personnel in time. With the LED large-screen display system, not only can the information of the construction personnel in the various areas of the cave be visualized, intuitively, and clearly reflected. Moreover, various welcome slogans and promotional slogans can also be displayed on the big screen during the tunnel opening meeting; in normal times, the construction staff can be reminded to pay attention to construction safety through the big screen, and can be warm in time when there are severe weather such as high temperature and frost. hint. These can fully reflect the humanization, modernization and scientific management of the tunnel construction project department.
Recommended size of LED display: 1.92*1.28㎡, different sizes can also be customized according to user needs.
3 Alarm system for foreign non-card personnel
The system has two implementation options:
a. Highway tunnels and railway tunnels are suitable for using card readers with alarm function to realize the alarm function for people without a card. The card reader has an infrared alarm function. When outsiders or construction workers without a card enter the tunnel alone, the card reader will trigger an alarm after being sensed by infrared, so as to notify the administrator in time. However, when the person without a card and the person carrying the card enter together, the card reader will not alarm.
b. The safety management system for urban subway construction personnel is suitable for barrier-free passage systems. The barrier-free passage system has the following energy supply characteristics:
(1) Support remote automatic card swiping
The construction personnel only need to put the identification card on the inside of the helmet, without actively swiping the card, and pass it naturally, which is fast and convenient.
(2) Illegal user alarm function
When outsiders or construction workers without a card pass through the passage, the passage will give out an audible and visual alarm to remind the security personnel, and at the same time, it will capture the image data of the passers without a card. Effectively prevent the entry of illegal personnel. If the person without the card enters the channel together with the person with the card, the system will not alarm.
(3) 24-hour surveillance video linkage function
When someone passes through, the manager’s computer will immediately display the corresponding information; the system supports remote video monitoring function, and the leader can directly monitor the picture of any camera in the office.
(4) Remote data and video real-time monitoring function
The system can monitor and record the people passing through the channel for 24 hours, and it also has the function of video capture. Once there is a problem, you can easily locate the corresponding responsible person.
4 Attendance, positioning system
Attendance system: Two card readers are installed in each construction tunnel. One card reader is installed at the entrance of the tunnel entrance, and the other card reader is installed 200 meters inward from the entrance of the tunnel. According to the sequence of the card read by the reader, the entry and exit situation of the construction personnel is judged, and when Entering, when leaving, and how many operators are in the cave can be reflected in the system software, and reflected on the large screen, so that the attendance status is clear at a glance. The construction personnel wear the system attendance card on the inside of the helmet, which can realize automatic attendance without actively swiping the card, which is convenient and labor-saving, and has high accuracy.
Positioning system: Install a card reader at the entrance of the tunnel entrance, and install a card reader at a distance of 150 meters from the entrance of the tunnel. It can be installed inside at a time, or it can be directly installed on a lift truck and operated with the trolley. Real-time recognition and positioning, and at the same time, a camera should be installed on the trolley to count the number of personnel on the work surface in real time, and cooperate with the camera to capture. The construction personnel only need to wear the system attendance card inside the helmet without actively swiping the card. Within the effective recognition range of each card reader, the construction personnel will be identified and managed according to the identified personnel identification card. The personnel can grasp the specific situation of the construction site in time in the monitoring room.
working principle
①2.4G active radio frequency card: carried by constructors or workers, usually on the belt or helmet of the constructor. Because it is two-way communication, the construction staff can send information to the monitoring center, and the monitoring center can also send information to each construction.
For example: when there is a special situation in the tunnel, the construction staff only needs to press a button, and the monitoring center will sound an alarm. When something happens in the monitoring center, the monitoring center can send a signal to each of the construction workers, or it can send a group message to indicate it through the indicator light.
② Time Attendance Card Reader: Install at the tunnel entrance. Two should be installed. The time and attendance machine reads the label information and transmits the information to the computer after judging whether the construction worker enters or goes out by reading the card sequence.
③Locate the card reader: Install the card reader in the tunnel and install the card reader near the construction site after a certain distance according to the actual situation. The positioning card reader transmits the read information to the computer via optical fiber.
④Optical fiber converter: convert the 485 signal and the optical fiber signal to expand the transmission distance
⑤RS232/485 converter: Convert the terminal’s RS485 signal to the serial port signal received by the computer.
⑥Computer host: install management software to monitor the construction personnel through the computer. Control the LED screen display content.
⑦LED display screen: display the information of the construction personnel on the screen.
5 Tunnel entrance and exit personnel and vehicle access control system
When a vehicle or person arrives at the entrance and exit of the tunnel, the infrared through-beam sensor detects the vehicle or person, and the card reader will automatically read the radio frequency card. At this time, the system will lift the barrier to let people or vehicles pass. If the card is only read or only a car or a person is passing, but the card is not read, then the barrier will not be lifted, and the vehicle cannot enter or exit. If a vehicle or a person is detected to pass, but there is no detection When the card is reached, the system will give an alarm at this time to show a warning. When the infrared through-beam sensor detects that the vehicle has left the barrier, the barrier will automatically drop. At the same time, infrared beams are installed in the barrier lines to prevent vehicles from smashing. At the entrance and exit of the tunnel, two card readers can be installed to judge the entry and exit of vehicles and people. The following figure shows the schematic diagram of the access control system of the two schemes. The difference between the picture above and the picture below is that there is an additional controller, which can be operated offline. If there is no controller, the computer should always be turned on. Therefore, we recommend that the system be a system with a controller.
6 Application areas
Tunnel personnel installation management system
Non-swiping card time attendance positioning system for urban subways on construction sites
Mine personnel positioning system
Mine personnel positioning management system
Plant personnel location management system
Other long-distance automatic identification systems
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