The wireless transmission scheme of high-speed railway highway tunnel with 10km long-distance wifi image transmission module. With the strengthening of China's basic transportation construction, the development of high-speed railways and expressways is constantly accelerated. In the process of road construction, it is inevitable to encounter complex geographical environment such as mountains and hills. In such an environment, the tunnel construction scheme, as a direct and commonly used traffic scheme, can effectively shorten the mileage, improve the linear standard, ensure the safety of operation, and protect the ecological environment.
In the application of tunnel industry monitoring system, the solution represented by the current 10km distance wifi graph transmission module wireless transmission system is more practical and efficient. For the tunnel wireless transmission solution, closely combined with the tunnel construction process and monitoring operation management of various application requirements, on the basis of ensuring a variety of tunnel complex environment, the use of mature microwave communication products - high bandwidth digital wireless transmission equipment, Advanced 10km distance wifi map module wireless network transmission system and advanced video technology to achieve professional tunnel safety system, to achieve all levels of supervisors on the site timely control. In the aspect of management, the work efficiency is improved, and the travel cost and ship cost of inspecting the site are saved. It not only brings changes in management efficiency, but also saves management cost in the long run.
In order to ensure the effective bandwidth of each wireless transmission point and the stability of the entire wireless link, we adopt different designs according to the specific situation of the site, which can well ensure the bandwidth of the network in complex cases. The integrated design brings convenience to the installation. In the wireless transmission system of wifi graph transmission module at a distance of 10km in the tunnel, the tunnel construction management department can effectively improve the production safety index, and can excavate the safety of vehicles and roof vehicles in the tunnel construction stage. As well as later traffic monitoring, environmental monitoring, through risk control system, lighting control, television, video monitoring, fire alarm, cross passageway door monitoring, central monitoring and other links to provide huge help for the management department.
Project requirement analysis
Achieve the project department, headquarters, handheld terminal to see the site control surface operation
To realize the project department, headquarters, handheld terminal can see the overall operation of the site
To realize the project department, headquarters, handheld terminal to understand the specific situation of the operation hole
The large screen is spliced in the monitoring center, and real-time images of different project departments can be seen
Video information for different project departments in different project departments
It can realize remote control, project department, mobile handheld terminal control site moving point camera
It can realize hierarchical management, and employees at different levels have different operation rights
System overall design principle and basis
In order to ensure the smooth implementation of the tunnel engineering comprehensive monitoring system, a detailed wireless centralized monitoring scheme is developed according to the site situation to meet various monitoring requirements of related departments. The scheme follows the principle of advanced technology, complete function, stable performance and cost saving. And comprehensive consideration of construction principles, maintenance operation factors, maintenance of future development, expansion, transformation, movement and other factors have room for expansion. There are the following principles:
1. Advanced nature and applicability
The system adopts 10km long-distance wifi image transmission module for high-bandwidth high-definition video signal transmission, and adopts high-bandwidth digital wireless modulation technology to achieve link transmission under complex construction environment, so as to avoid damage to the line by large machinery.
2. Economy and convenience
Give full consideration to the actual needs of users and the development trend of information technology, according to the needs of customers, according to different locations design different combinations and electrical combinations, without large-scale wiring, can be copied and reused, can continue to use in the next construction site.
Step 3 Be open
All system transmission is based on TCP/IP protocol. Different devices can use the network platform built by us to transmit data, such as access control. Positioning, sensing, etc.
4. Scalability
Considering the needs of future technology development and use, the system design has the possibility of updating, expanding and upgrading. And expand the system's capabilities according to the actual requirements of future projects, while leaving redundancy in the design to meet future development requirements.
5. Reliability and security
The design of the system takes full account of the on-site circuit and working environment, and each place is treated with DC voltage stabilizer, which can ensure that large electrical appliances, when arc welding and other work produce power surge, will not damage the equipment, so as to ensure the system line.
Network scheme of the whole 10km long-distance wifi graph transmission module system
The length of the 6.4km tunnel is divided into 5 working faces. The inlet position and the 1# inclined shaft are single working faces, and the site operation is handled by one branch. The second branch is responsible for the outlet location and the 2# incline, which is operated in both directions.
1# inclined shaft front-end working face camera adopts the mobile point all-round HD pin-head camera (horizontal 360 degree rotation, up and down rotation, up and down rotation, +90~-90 degree adjustment can observe various angles of the front-end working face), a relatively fixed HD infrared ball machine (installed on the cloth hanging car, can move forward with the change of the position of the trolley). The position of the front moving point is uncertain, so it is designed as an omnidirectional antenna, which is transmitted to the second liner together with the equipment on the hanger car as a pair of two receiving (the distance between the hanger car and the second liner will advance with the progress. Although the distance between the two vehicles is very close, due to the heavy equipment, if the force is not equal in the process of pushing forward, we are worried about the damage of the line, so the camera here is also transmitted wirelessly to the second liner car). The position of the second lining vehicle is transferred to the entrance intersection by another wireless device. There is an obvious curve between the intersection of the cave entrance and the 1# inclined shaft, so a pair of relay equipment is added in the middle, and the camera at the entrance adopts a fixed installation mode. Since No. 1 inclined well could not look directly into the project department, a branch mixing plant and nearby villagers' water tower (red room) were transmitted to a branch project department twice.
The internal front end of the tunnel inlet is the same configuration as the 1# incline, but a repeater is added at the secondary liner and tunnel entrance which can be transmitted directly with a section. DC voltage protection and DC monitoring special uninterruptible power supply are considered in all installation locations. All relay locations are considered industrial monitoring special switch docking. (The installation is performed in a customized waterproof and dust-proof box. The power supply is centralized, which facilitates system stability and onsite maintenance.
The 2# well and outlet locations are transferred to the second company as a whole, with the same basic idea as above. Only the 2# inclined shaft is two-way construction, with an additional working face, so the design idea of the front working face is the same, but it needs to be integrated at the intersection of the entrance of the hole, and unified transmission to the entrance of the hole. There is an earth hill between the opening of the No.2 inclined well and the project department, on which there is a plane of different slopes, about 150~200 meters. Therefore, additional relays are needed here. Since there is no power supply on site, we use complementary scenic power supply here. And then it goes to Company Two. The tunnel exit can be directly visible to the second company, so it is transmitted directly to the second company.
One section has a digital network video storage and forwarding host, with 22 inch professional video monitors on site. It is also equipped with an access layer switch to connect with the project department's network and connect with the center through the project department's broadband network (in order to ensure transmission quality, the Project Department needs at least 100M of the above uplink network).
10km wifi image transmission module system can also be used in the following fields:
Safe city, public security system HD network video surveillance
Financial banking high-definition video network monitoring
Airport, customs, border security high-definition video network monitoring
Water conservancy and electric power, mobile base station system unattended high-definition video network monitoring
High-definition video network monitoring of pollutant discharge, environmental protection monitoring, forest fire prevention and disaster reduction
Large and medium-sized supermarket chain online monitoring
Campus, industrial park, hospital network monitoring
