With the rapid development of my country's economy, the problem of traffic congestion in the country is becoming more and more serious; in order to solve the urban traffic problem and strengthen the basic construction of urban traffic facilities, open-cut sunken tunnels are used for the intersections of main roads, forming above-ground and underground tunnels. The integrated transportation hub is the way to solve the urban transportation problem. However, when an abnormality occurs in the submerged tunnel (large area of water accumulation, fire, traffic jam, etc.), it will seriously affect the safety of car drivers and passengers in the submerged tunnel. Therefore, it is necessary to build a monitoring and early warning system for a submerged tunnel within a certain range of the submerged tunnel. Using the existing transmission network of the submerged tunnel, it is not necessary to re-lay the transmission control bus, and some auxiliary materials can be provided to realize the early warning information release and broadcast system; to provide the safety of passing car drivers and passengers.We have many horn speakers used in tunnels
2. System functions:
1. Unified management: The subsidence tunnel management center collects the depth of accumulated water in the tunnel, and performs sound and light alarms at the entrance of the tunnel and LED screen prompts for the depth of accumulated water;
2. Grouping control: The subsidence tunnel management center can divide, group or publish early warning information for each road section;
3. Text broadcasting: On the traffic broadcasting system platform, it supports inputting long texts for text-to-speech broadcasting;
4. Pre-plan broadcasting: Various pre-plan settings can be made, various monitoring equipment can be connected, aInstalling the PA loudspeaker and the broadcast can be automatically controlled according to the pre-plan in an emergency.
5. Scheduled broadcast: The sinking tunnel management center can be set to regularly release traffic safety, safe driving, legal publicity and other functions, with unattended functions.
6. Emergency broadcast: In case of emergency, it can be broadcast by remote phone and short message, and the broadcast content can be stored, recorded, inquired, and played back;
7. Emergency assistance: Paging assistance intercom terminals are set up in various sections inside and outside the submerged tunnel to facilitate emergency assistance for drivers and passengers;
8. Remote maintenance: supports remote configuration of some parameters such as volume and power on/off, and has remote upgrade function.
9. Network management monitoring: Through 3G/4G network and IP network to realize the backhaul of the running status for remote network management, the system can remotely monitor the working status of the equipment.
3. System planning:
The main body of the system adopts wireless 3G/4G network and wired IP network to realize broadcast signal transmission; through wireless 3G/4G network and wired IP network, real-time return monitoring of the operating status of the receiving terminal is realized; the sink tunnel management center manages and controls the entire system, The system supports functions such as automatic timing broadcast, instant information release, early warning plan release, and emergency call insertion.
1. Subsidence tunnel management center: The design adopts broadcast control server, monitoring large screen, intelligent integrated broadcast control platform, etc. to build the hardware platform of the subsidence tunnel management center, and configures the traffic broadcast system platform for automatic control, management and early warning information release.
2. Dangerous source detection point of the subsidence tunnel: design and use water level sensors, water level gauges and other monitoring equipment to collect on-site water level conditions, and send the monitoring data back to the system platform of the management center through 3G/4G network, and the system platform analyzes the monitoring data according to the preset plan Control management.
3. The broadcast point at the entrance of the sinking tunnel: The intelligent broadcast terminal is designed to connect with LED screens or sound and light alarms, solar broadcast terminals and other equipment to receive the upper-level warning information for real-time release and alarm by connecting to the wired IP network or 3G/4G network.
4. The broadcast point of the sinking tunnel: The intelligent broadcast terminal is designed to receive the daily broadcast or emergency broadcast issued by the system platform by connecting to the wired IP network or 3G/4G network, and perform early warning broadcast by connecting the high-definition speakers.
5. Help point in the sinking tunnel: The design adopts a paging help intercom terminal, and connects the management center through the IP network or 3G/4G network to realize the functions of asking for help and intercom with the management center.
I. Overview:
With my country's increasing construction of transportation network, the pace of highway construction in my country is increasing. At present, there are many highway tunnels and urban tunnels in China, some of which are more than ten kilometers long. After vehicles enter the tunnels, the ground broadcast signal cannot be heard. In addition, once an accident occurs in the tunnel, the moving vehicle cannot obtain information, and it is easy to cause major secondary injuries. The construction of the tunnel broadcasting system satisfies the coverage of FM broadcasting and the construction of emergency broadcasting. It adopts the working mode of "wireless reception and forwarding on the same frequency" to cover the whole tunnel without blind spots. At the same time, the tunnel broadcasting system also has "group carrier" emergency Broadcast function, once an accident occurs in the tunnel, the system will automatically switch to the emergency broadcast channel, no matter which radio program the car radio is listening to, it will automatically switch to the emergency broadcast signal.
The tunnel broadcasting system solution is to set up a receiving antenna in a relatively open and high altitude area outside the tunnel to receive local open-circuit FM broadcasting signals. The received signal is amplified by a high-gain antenna amplifier and filtered by a band-pass filter, and then transmitted to the tunnel management center, mixed with the FM signal modulated by the intelligent integrated broadcast control platform, and then amplified by the FM repeater. Transmit coverage, so that vehicles entering the tunnel can hear the FM broadcast signal clearly. Can achieve:
1. Automatic rebroadcast: It can automatically rebroadcast the FM radio signal outside the tunnel.
2. Wireless forwarding: FM broadcast coverage in the tunnel is achieved through the FM repeater and leaky cable set in the tunnel.
3. Stable and reliable: The system adopts mature and stable FM modulation and demodulation technology, cellular broadband amplification technology, and the field strength value is stable and reliable.
4. Beautiful sound quality: FM radio has the advantages of good sound quality and strong anti-interference ability.
5. Emergency handover: In case of emergency in the tunnel, the FM broadcast signal can be cut off immediately, and the FM band (87-108Mhz) can be broadcast urgently.
2. System functions:
1. Combination of peacetime and wartime: the system can realize both daily FM broadcast and timely release of emergency broadcast messages; the broadcast signal source is local FM radio broadcast programs and tunnel self-organized radio festivals.
project, tunnel self-organized display information, emergency broadcast, etc.
2. Addressing control: with addressing control function, grouping and partition broadcasting; the receiving terminal performs polling, command reception, address matching and priority judgment on the upper-level broadcast frequency point, and then the system will respond automatically.
Live broadcast.
3. Priority level: Following the broadcasting principle of "emergency broadcasting has a higher priority than daily broadcasting", after the emergency broadcasting signal source is broadcast, the daily FM broadcasting signal is cut off to realize the radio frequency modulation frequency band
The program broadcasts emergency broadcast information.
4. Multimedia control: with U disk/TF card MP3 playback/radio reception function, with microphone input, DVD/satellite receiver audio input, power control, local monitoring, remote mobile phone monitoring
Function; with remote wake-up, security verification, fast broadcast, volume adjustment functions.
5. Authority management: with user authentication and authentication mechanism, daily broadcast and emergency broadcast information are transmitted through authentication and digital signature, ensuring the security of command transmission, with anti-interference and attack defense
Attack and tamper-proof mechanism; support authentication functions such as whitelist, password, hierarchical partition information, etc., and support real-time record review function.
6. Disaster early warning: It has the function of emergency plan setting, and realizes emergency linkage broadcasting in emergency situations.
7. Emergency broadcast: You can press a button to turn on the microphone for emergency broadcast function, and you can directly amplify multiple frequency points in the input 87-108MHz frequency band and then output, FM and direct playback
The station does not have the function of frequency selection.
8. Telephone insertion: support mobile phone, telephone remote control, point-to-point emergency broadcast according to the authority partition, Chinese voice operation prompt throughout the whole process, and a prompt tone when busy. With caller ID, record,
Query, recording and playback functions.
9. Short message broadcasting: It can store more than 20 emergency short messages, automatically turn to voice broadcasting in sequence, has the function of filtering keywords and spam malicious short messages, and has the ability to display and record message content.
Record, query and playback functions.
10. Scheduled broadcasting: The tunnel management center performs scheduled broadcasting according to the time set in the program table, the set content and the set area; programming is 24 hours a day, and different settings can be set every day.
The broadcast content enriches people's lives.
11. Maintenance and upgrade: It supports remote configuration of some parameters such as the volume of the receiving terminal equipment, power on and off, etc. It has the function of setting parameters by local infrared remote control, and has the function of local and remote upgrade.
3. System planning:
1. Tunnel management center: design and install 1 FM signal amplifier to amplify the local radio signal, and transmit it to the FM repeater through optical fiber or coaxial; configure 1 intelligent integrated broadcast control panel
The tunnel's self-run radio programs are FM modulated and then transmitted to the FM repeater; at the same time, a group carrier FM modulator is configured for emergency broadcast insertion.
2. FM repeater: Design the tunnel to install 1 FM repeater every 800 meters, and transmit the local radio signal, self-run program signal and emergency broadcast signal of the management center through the leaking cable.
Perform tunnel FM signal coverage.
3. Receiving terminal: The tunnel is designed to install an intelligent broadcasting terminal every 200 meters to receive the tunnel self-organized program signal/emergency broadcasting signal by connecting the high-definition horn for broadcasting, publicity and delivery.
Through legal publicity, emergency personnel evacuation command, vehicle dispatch, etc.
Our horn loudspeaker plays an important role in tunnel broadcasting, welcome to contact.
Our horn plays an important role in tunnel broadcasting