In recent years, the construction of highway and railway in China has realized the leapfrog development, which directly contributes to the improvement of the overall economic strength. In our country, the construction of tunnel is necessary for the construction of highway and railway because of complex geographical environment. But the tunnel construction environment is complicated, there are many hidden works, and the supervision is difficult. According to the requirements of "Technical Specifications for Highway Tunnel Construction", the construction site must be monitored in real time during the implementation of tunnel construction. Today, we will learn about the important application of field monitoring in the Cangshan Tunnel monitoring project.
Project introduction
Expressway Cangshan is ready to blast after a palm face, which means the entire Cangshan tunnel is about to be fully connected. In the blasting process, the real-time monitoring of the blasting environment should be realized.
On-site demand
The actual site is two 10km construction tunnels, and the customer needs to carry out 7×24 hours video monitoring on the construction progress, safety and construction specifications of the inner palm surface of the tunnel. At the same time, because there is no operator signal in the tunnel and the distance is too far, it is impossible to contact through intercom. Therefore, the tunnel network needs to be transmitted to the tunnel to carry out WIFI coverage of long-distance image transfer module of WIFI module at 2000 meters, so that the construction personnel in the tunnel can contact with external management personnel.
Due to the practical application of tunnel in construction, the tunnel face will burst from time to time. In this case, the traditional equipment can not meet the field conditions, the explosion-proof wireless is needed to deal with the palm surface blasting produced by the air wave and gravel impact. Therefore, the remote image transfer module of 2000 meters WIFI module can be used in complex tunnel environment, taking into account high bandwidth and stability.
Specific implementation plan introduction:
The whole length of the tunnel is 10KM. Due to the large construction vehicles in the tunnel, they should be installed at a higher position on the side wall of the tunnel to avoid signal attenuation caused by the congestion of the large vehicles. Specific configurations are as follows:
Front end point: There are three points at the front end, which are located at 2KM of the tunnel, 5KM of the tunnel and the palm of the tunnel. The remote image transmission module of the WIFI module of 2000 meters is transmitted to the relay point for configuration and reception, and the palm monitoring device moves forward with the construction progress.
Relay points: Because the tunnel is not a straight line and the bend of 5km is large, it is impossible to realize the condition of unobblocking access. It is necessary to add relay points at 5km of the tunnel to receive video surveillance data of the front three points and transmit the Internet to the front three points for AP coverage. Here equipped with 2000 meters WIFI module remote image transmission module omnidirectional antenna.
Rear endpoint: At the entrance of the tunnel, the remote image transfer module equipped with a WIFI module of 2000 meters receives data from the relay point, and then transmits it to the switch in the equipment room through the network cable, which is displayed in real time on the monitor in the equipment room for 7 x 24 hours monitoring.
Through the remote image transfer module of 2000-meter WIFI module, the palm surface blasting project of Cangshan Tunnel is successfully completed, and the high-speed Cangshan Tunnel is fully through. In addition, the use of wireless intelligent video monitoring technology in tunnel construction can reduce the manpower to guard materials, improve the efficiency of workers, reduce construction costs under the premise of ensuring the quality and safety of the project, and has good practicability.
