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1 Overview
1.1 System background
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, Shenzhen Lingzhi Hangyuan Technology Co., Ltd. proposed a “Tunnel Personnel Attendance and Positioning System Solution”, which provides a brand-new safety management concept and strong guarantee for the safe construction of the tunnel.
1.2 System introduction
The Tunnel Staff Attendance and Positioning System integrates the functions of tunnel construction staff’s attendance, regional positioning, safety early warning, post-disaster first aid, daily management and other functions. It is also a domestic tunnel construction site monitoring system with leading technology, stable operation and professional design. It enables management personnel to grasp the distribution status of personnel and equipment on the construction site and the movement trajectory of each personnel and equipment at any time, facilitating more reasonable scheduling management and safety monitoring management. When an accident occurs, rescuers can quickly understand the location of relevant personnel based on the data and graphics provided by the system, and take corresponding rescue measures in time to improve the efficiency of emergency rescue work. The realization of this scientific and technological achievement has promoted the safe production and daily management of tunnel construction to a new level.
The tunnel personnel attendance and positioning system can not only realize attendance or positioning, but also realize two functions of attendance and positioning at the same time.
2 system composition
2.1 System composition
Product List
Product name and model specification remarks
1 LZRF257A reader
2 LZRF2407B active RFID electronic tag (card-shaped) 86mm × 54mm There is an “emergency” button on the card
3 LZCON300 substation/master station
4 Red LED display 2000mm × 1200mm
5 Card issuing software
6 Acquisition software
7 Management software (IE version)
8
2.2 Working principle
2.2.1 Active RFID electronic tags
Constructors or workers carry them with them, usually on their belts or helmets. When entering and exiting the tunnel, tags can be collected to complete personnel attendance and positioning functions.
When construction personnel or staff encounter an accident, they can press the “emergency” button to send it to the information center.
2.2.2 LZRF257A reader
Used to collect tag information. Communicate with substation or master station through RS485 bus.
2.2.3 LZCON300 substation/master station
Receive data from the reader. And analyze and process the data. Communicate with the server via Ethernet.
2.2.4 LED display:
Installed near the tunnel entrance, used to display the information of the construction personnel, so that the management is advanced and transparent. The displayed content includes: tag number, name, time, total number of people (the size of the screen is 2M*1.2M, the screen can also be larger).
2.2.5 Other matters
(1) The number of card readers and the installation method are determined according to the actual situation of the tunnel site, and the two parties shall negotiate and settle.
(2) Software function: The function of the system software is developed according to the customer’s requirements, please communicate with the software developers of our company before the software development.
3 system features
3.1 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 card reader installed nearby.
Long recognition distance (0-100 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.
Very high anti-collision: each detection point can simultaneously identify up to 500 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, the dynamic tag card can also be recognized.
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)
3.2 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.
3.3 High safety and stability
With safe explosion-proof, dust-proof 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
3.4 Simple and convenient operation
The software has a full Chinese menu with a good operation interface
Integrated structure design of wireless monitoring substation, convenient and quick installation
The built-in battery of the identification card, ultra-low power consumption, no external miner’s lamp power supply, no need to charge
Two-way card can replace the battery
3.5 Rich query and report functions
Query and report output, printing functions are simple and easy to operate
Can query the attendance information of construction personnel, departments and cadres
Can query 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)
It can be known 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.
4 system function
4.1 Attendance management function
Through the card reader, it can be judged that the construction personnel are the entry and exit records at any time.
Can add, modify, and query information about construction personnel, cadres and departments.
Employee Attendance Inquiry: The attendance status of personnel can be inquired by department and various specified conditions, such as: number, name, shift, type of work, department and other query conditions; it can be automatically sorted according to any conditions;
Cadre Attendance Inquiry: Query and display the attendance status of all cadres on the day;
Reports can be output according to user requirements
4.2 Positioning management function
You can inquire at any time and display the identity, quantity and distribution of personnel and equipment in a certain area.
Query the current actual position and activity track of one or more personnel and equipment.
Record a series of information such as the arrival/departure time and total working hours of relevant personnel and equipment at any location, and can supervise and confirm whether important inspection personnel (such as: safety inspection personnel) conduct on-site inspections on time and on-site, or perform various items The detection and processing of data fundamentally eliminates related accidents caused by human factors.
4.3 Set the alarm function
4.3.1 Alarm function for outsiders
For outsiders or construction workers without a card, the system will automatically alarm when they enter the tunnel alone. However, when entering with the card holder, the system will not alarm.
4.3.2 Zone alarm function
Set the alarm function in the specific area, and set the authority for the label card. For example, when blasting in a tunnel, set the blasting work surface as a guard zone. If unauthorized personnel and equipment enter the guard zone, the system will automatically alarm and display the identity of the personnel and equipment entering the guard zone, and take corresponding measures in time , After the blasting is over, the alarm setting will be cancelled.
4.3.3 Query Statistics
Construction personnel query: You can customize the combination of conditions to query the current area of the construction personnel, the detention time and the leader of the shift into the tunnel.
Worker distribution query: query the distribution of construction personnel in each area of the tunnel, so that managers can easily know the number of workers in a specific area. Click on the corresponding area to get detailed information about the relevant personnel.
Unreached area query: used to inspect and assess the situation of relevant responsible persons and follow-ups, and to inquire whether the special type of work has reached all areas of its work scope. Click on the relevant status to get the detailed records of the arriving personnel and work.
Statistics of construction personnel: The number of construction personnel entering and exiting the tunnel can be counted according to the date.
Regional population statistics: You can arbitrarily set up and manage related construction areas, and automatically perform regional population statistics.
4.3.4 First aid information after the disaster
Once a safety accident occurs, the control host can immediately display information such as the number of personnel, personnel information, and personnel location at the accident site, which greatly improves the rescue efficiency and rescue effect.
4.3.5 Information networking function
By setting up a WEB server, information sharing can be achieved by browsing web pages, and the client does not need to add any additional software. (The computer in the monitoring room is required to be able to access the Internet)
4.3.6 Other functions
If the above functions cannot meet your requirements, we can tailor the functions for you.
5 Equipment introduction
5.1LZRF257A reader
5.1.1 General performance
Working temperature: -25 ~70℃;
Storage temperature: -40 ~85℃;
Working humidity: less than 95%;
Working voltage: DC 7.5-12V, powered by the supplied power adapter;
Working current: less than 100mA;
Weight: 2.5kg;
Dimensions: 320mm×200mm×100mm;
Packing size: 350mm×220mm×130mm;
5.2 Antenna index
Frequency range: 2400-2500MHz
Bandwidth: 100MHz
Gain: 16dBi
Horizontal lobe width: 75°
Vertical lobe width: 55°
Front-to-back ratio: ≥18dB
Standing wave ratio: ≤1.5
Input impedance: 50 ohm
Polarization method: linear polarization
5.2.1 Technical indicators and functions
Carrier frequency: 2400-2500MHz;
Transmission frequency: single carrier;
Transmission carrier power: <=0dBm;
Communication interface: RS485;
RS485 communication rate can be set: 1200, 2400, 4800, 9600 (default);
Communication method: combination of active and passive;
Collision ability: It has strong anti-collision ability, and the number of cards that can be read at the same time>2000;
Reading distance: internally adjustable (adjusted by software);
Multi-buffer technology is used internally (the buffer capacity of 256 tags can be read at the same time);
Read tags: JAVS2 type read-only active electronic tags;
Have lightning protection measures;
RS485 bus adopts optical isolation technology;
5.2.2 Main technical indicators
Label recognition accuracy: greater than 99.9999%;
5.3 LZRF2407 activeRFIDelectronic label
5.3.1 General performance
Working temperature: -25 ~70℃
Storage temperature: -40 ~85℃
Working humidity: less than 95%
Dimensions: 55*86*7
Working voltage: 3V (powered by button battery);
Static (standby) working current: <1uA;
Maximum working current: <15mA;
5.3.2 Technical indicators and functions
Working frequency: 2.4GHz-2.5GHz (factory setting);
Working method: active;
Transmitting power: less than 1mW (0dBm) (factory setting);
Reading method: read-only;
Reading distance: 0-100 meters; 0-50 meters; 0-25 meters; 0-10 meters; (factory setting)
Write distance: <20 meters;
Water resistance: waterproof;
Working life: 5 years (theoretical value);
Working voltage: 3V (two 600mAh button batteries in parallel);
Query time: 0.25 – 0.375s; 0.5 – 0.75s; 1.0 – 1.5s; 2 – 3s; (factory setting)
Collision ability: It has strong anti-collision ability, and the number of cards that can be read at the same time>2000;
With battery indicator function;
Data has encryption function;
6 Quality Assurance System
6.1 Engineering Quality System
As a well-known company in the same industry, our company is inseparable from the company’s emphasis on product and engineering quality. In long-term work practices, the company strictly implements industry standards and norms. And through continuous practice and exploration, summing up experience and lessons, a complete set of methods and skills have been formed, and there is a wealth of experience in standardized design and construction.
6.2 Engineering design procedure
6.2.1 Engineering technical design
Engineering technical design must ensure that it meets the requirements of the mandate (or agreement) and contract.
For engineering design, it is necessary to establish hierarchical and staged design quality reviews to implement reliable monitoring of design quality.
The engineering design drawings implement a three-level review and sign system of proofreading, review and approval, a process and quality countersign system, and a standardized inspection system to ensure that the design drawings, process documents and technical files are complete, accurate, coordinated, unified and clear.
6.2.2 Engineering construction drawing design
Before the project enters the construction and installation design, you must understand the relevant structural drawings provided by the user, conduct a detailed survey of the site conditions, and reasonably arrange the monitoring points and detectors according to the actual situation and the requirements of the task book to ensure their effectiveness and reliability. .
System and equipment connection diagram, according to the system design schematic diagram and the selected equipment for desktop joint test, in order to grasp the port characteristics and system connection, and make a pipeline table based on this, the pipeline table should have number, model specification, length, port The specification and model of the connector.
The design drawings should refer to the relevant installation and construction specifications, and the necessary plan descriptions should be attached.
6.3 Project construction and installation procedures
6.3.1 Preparation before construction and installation
Construction and installation design drawings and necessary technical documents must be complete.
Personnel organization, on-site understanding, familiarity with drawings and materials, and designers thoroughly confessed. On-site personnel should have electrical professional construction and installation skills and knowledge, must have passed professional training, passed the review of relevant agencies, and hold certificates to ensure the quality of the project in their respective jobs and complete their respective tasks. At the same time, on-site personnel should be responsible to users, keep system secrets (such as passwords, passwords, etc.), and keep secret personnel to a minimum.
Pipeline burying and pipeline wiring shall comply with the current national “Code for Construction and Acceptance of Electrical Installation Engineering” and the provisions of the integrated wiring code. Any changes to the design drawings, equipment models, etc. must be approved by you and the competent authority.
The installation of the reader should meet the requirements of the design drawings and product installation instructions.
System grounding: The working grounding from the center room to the grounding body should be penetrated through a solid protective sleeve, and the working grounding and protective grounding must be separated.
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