Automatic attendance and location access control monitoring system for tunnel construction personnel

chrispeng December 28, 2021 transport

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Chapter 1 Introduction

1.1 System introduction

This system focuses on comprehensive tunnel management of various resources, and uses advanced technology to integrate and utilize the system under the premise of ensuring the normal application of the established system functions. Including video surveillance, personnel access and location management, personnel/vehicle access control systems, tunnel gas monitoring, etc. Maximize the use of resources to upgrade tunnel work and management to a more sophisticated management platform.

1.2 Design principles and basis

Overall design principles

The overall design is based on the needs of customers and fully integrates existing mature and complete technologies.

The tunnel comprehensive application system is an advanced technology involving video surveillance technology, sensor technology, LED display technology, radio frequency identification technology and other fields. Therefore, the overall plan design must be reliable, safe, advanced, flexible and economical. Practicability, convenience of operation and maintenance, and more forward-looking construction of a unified management platform for the overall situation.

In the planning and design process, the system design aims at ensuring safe production, improving enterprise efficiency, and improving the quality of enterprise management, and takes high-quality service managers and users as the basic principles and design ideas.

Hardware design principles

The hardware design and selection of the system should follow the following principles:

Advancement: System hardware should be advanced to avoid low performance or premature elimination of the entire system due to obsolete technology in the short term.

Reliability: While fully considering the advanced nature, the hardware system should be based on the specific needs of users for the entire system, and should give priority to advanced, applicable and mature technologies to maximize investment benefits.

Openness: The choice of computer network and related products should be based on advancement and applicability, while considering compatibility.

Expandability: The system data acquisition equipment adopts modular structure and bus communication mode. When the system scale is expanded, no major transformation is required, and the corresponding modules can be added.

Chapter 2 System Composition and Working Principle

2.1 System composition

The tunnel integrated application system mainly consists of personnel entry and exit positioning management system, personnel/vehicle access control system, LED display system, video monitoring system and communication system.

Personnel Entry and Exit Positioning Management System

Attendance Management

Positioning management

System remote management

Personnel/vehicle access control system

Access control barrier management

Personnel/vehicle credit card management

Gas monitoring

LED display system

LED large screen display

Video surveillance system

Tunnel entrance video surveillance

Video Surveillance

Remote video terminal service

Communication system

Optical fiber transmission part

Wireless transmission part

Other cable transmission parts

2.2 Overall platform architecture of system application

◇ Can have a remote center, which can query the relevant security information of the current tunnel in real time;

◇ Adopt a three-tier system architecture including front-end work point monitoring, intermediate communication layer, and background scheduling monitoring

◇ Front-end work point monitoring (personnel entry and exit positioning management system, video surveillance, personnel/vehicle access control management) and background dispatch (remote central computer room, server and some external docking platforms) adopt B/S application architecture.

2.3 Topology diagram of system network structure

2.3 Personnel Entry and Exit Positioning Management System

The personnel entry and exit management system can be divided into personnel entry and exit attendance management and personnel positioning information management. Mainly include monitoring host, card reader base station, personnel identification card, transmission data interface converter, etc.

Monitoring host (field server): an independent computer, responsible for the management, communication, statistical storage of the entire system equipment and personnel detection data, as well as screen display, query printing, screen editing, network communication and other tasks.

Card reader base station (card reader): collect and receive personnel card information in real time and feed it back to the system in real time through the communication line. It can be divided into positioning base station and identifying base station.

Personnel identification card: programmed with a globally unique identification code, which is only provided to the card reader base station for identification. It is generally installed on a safety helmet or worn on the body, health certification, safe and reliable

Transmission data interface converter: including some signal converters, which mainly realize the conversion of signals so that the system can better receive and process data

The general schematic diagram is as follows

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 two card readers near the second lining trolley of each construction tunnel. One is installed before the trolley and the other is installed behind the trolley. Positioning of personnel working on the face of the tunnel. After the trolley, it is mainly responsible for the positioning of the personnel working near the trolley. ≧1000 meters, the excavated part exceeds 600 meters), the 2 sets at the entrance of the cave can also realize the positioning function, and the positioning in the cave can be recognized and positioned in real time with the operation of the trolley. 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. At the same time, the special personnel card can have buttons to realize two-way communication inside and outside the cave. When there is a dangerous situation in the cave, the button can be used to notify the duty room outside the cave in time for danger prevention and rescue.After obtaining the information outside the cave, you can also notify all the people with identification on the spot by broadcasting

2.4 Personnel/vehicle access control channel system

The access control channel system mainly uses the automatic card swiping mechanism to restrict the entry and exit of personnel to ensure that non-workers are prohibited from entering and exiting the construction area privately. At the same time, it can also be used to ensure the authenticity and validity of the data and avoid the failure of attendance or management errors due to human factors. .Vehicle access control can improve timely management and control of on-site vehicles and achieve more effective vehicle utilization

Host (field server): Responsible for the management, communication and statistical storage of the entire system equipment and personnel testing data

And tasks such as screen display, query printing, screen editing, and network communication.

Control board: collect and receive the information of the personnel card in real time, and feed it back to the system in real time through the communication line and generate instructions to control the swing gate, and control according to the validity of the data to ensure the normal entry and exit of personnel.

Barrier: Mainly installed at the entrance, restricting the entry and exit of vehicles

Ground sensing detector: timely detect whether there is a vehicle passing by, and send information to the control system to generate related linkage

Three-roller gate: also installed at the entrance of the tunnel, restricting the entry and exit of personnel

Card reader: A long-distance card reader can obtain the electronic tag card information carried by personnel/vehicles by approaching automatic card swiping, and transmit it to the background control center.

The use of the personnel/vehicle access control channel system can realize the diversion of incoming and outgoing people and vehicles to ensure a certain degree of safety in and out, as long as the personnel and vehicles are equipped with relevant electronic tags. When a person carries a personnel card (ie electronic tag) and is close to the personnel access control channel, that is, the three-roller gate, the built-in card reader can read the card information in time and send it to the background for verification. After the operation is passed, the command will be sent to the three-roller The gate is opened and let go, otherwise it will not change. For the vehicle access control system, it is also necessary to configure a vehicle card for each vehicle. When the vehicle passes through the passable area, it will trigger the card reading, and there is also ground sense trigger. When the card is read and ground sense triggered at the same time, the system will determine the vehicle If the passage is allowed, the barrier gate will be opened. A single card reading or a single ground sense trigger, the system agrees that it is not allowed to pass.

2.5 Gas monitoring system

The environmental monitoring system focuses on the monitoring of hazardous gases, such as gas. Where gas monitoring is required on the excavation surface, install the corresponding gas monitoring device, and use the gas detector to monitor the gas in the area, so as to notify the background of real-time gas concentration information in time to ensure timely prevention, safety warning, and guarantee tunnels Work is more normal and safer.

The environmental monitoring system mainly includes monitoring servers, front-end perception monitors, transmission interface converters, etc.

Monitoring server: Mainly responsible for receiving, processing, and reflecting the relevant data returned from the previous monitoring equipment, and save it for viewing

Front-end perception monitor: generally refers to data collection equipment, such as gas monitors.It can collect on-site environmental parameters in real time and transmit them back to the server through the system communication system in real time

Transmission interface converter: including some signal converters, which mainly realize the conversion of signals so that the system can better receive and process data

2.6 LED display system

It is better to install the large LED screen near the construction entrance, close to the gatehouse or the duty room, to display the information of subway 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 go under the tunnel, and do not need to 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, during the on-site meeting, various welcome slogans and promotional slogans can also be displayed on the big screen; in normal times, the construction staff can be reminded to pay attention to construction safety through the big screen, and warm reminders can be promptly provided in severe weather such as high temperature and frost. . These can fully reflect the humanization, modernization and scientific management of the tunnel construction project department.

System composition: server, synchronization system card, LED display

Server: Mainly realize the editing and control of the displayed content

Synchronous display system card: the core part of the system, realizes the display content of the computer and the LED screen simultaneously.Compile and transmit the signal

LED display screen: assembled by modules composed of 32X16 led light dots (P10 single red) array, the size of the assembly can be selected according to the actual situation

Schematic diagram of LED large screen system

2.7 Video surveillance system

The network video monitoring system includes front-end video capture equipment, network video codec, communication transmission equipment, and back-end monitoring and receiving client software. Installed at the main monitoring points of the tunnel to perform signal collection and transmission. The software is mainly installed on the computer in the monitoring room. The two are authorized by the platform management center system to perform multi-point to multi-point real-time monitoring and management of their front-end video points. Such as: video, pan-tilt, zoom, video, and other functions. Users with administrative rights can also set, download, and perform real-time video on-demand operations on any point of video; the system can also be monitored through a PC browser.

It can be seen that the 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 in the monitoring room. Managers 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 master the video monitoring points of the construction. Real-time situation, so as to achieve timely and accurate supervision of it anytime, anywhere.

In actual tunnels, cameras are generally installed on the face of the tunnel and near the opening to display real-time monitoring of the monitoring area, allowing managers to more directly understand the situation on the spot.

System composition: server, camera, video server, transmission data interface converter and communication transmission part

Server: The monitoring platform terminal displays the information returned by the system, and controls the cameras at each monitoring point through the platform software, and provides multiple functions such as recording, playing video, and pan-tilt control.

Camera: Front-end monitoring equipment, real-time collection of signals. Provide PTZ equipment to realize the change of camera angle and provide omnidirectional three-dimensional monitoring.

Video server: It mainly realizes the conversion of the analog signal of the sound and image into the digital signal for transmission, and then transmits it back to the monitoring platform through the communication line.

Transmission data interface converter: including some signal converters, which mainly realize the conversion of signals so that the system can better receive and process data.

Communication transmission: It is mainly composed of some RVVP cables and network cables to realize the timely transmission of video signals.

2.8 Communication system and background system

According to the actual environment of the site, a variety of communication systems are selected on site, including wired communication, wireless communication and optical fiber communication systems, and various communication systems are reasonably matched to ensure the best and most reasonable communication transmission.

The back-end system adopts the most cutting-edge TV wall technology according to the demand analysis, and presents the data on the TV wall in a timely manner through platform services for the administrator to analyze and process in time