With the constant progress of the society, the concept of safety in production has been deeply rooted in the hearts of the people, people also more and more high to the requirement of safe production. Accidents in construction industry, how to guarantee the safety of construction personnel, as well as the site of construction materials, equipment and other property preservation is the construction units concerned with priority.
Due to the limitation of construction environment, the safety of the equipment, material management is not perfect and some staff's self protection consciousness weak, provides an opportunity for criminals. In order to further improve construction site safety management, the monitoring technology is introduced into the construction site, became the first choice for many construction units.
After we preliminary scene investigation, the mostly mountainous area highway construction environment, terrain, wide range of monitoring, usually within a few kilometers to a few tens of kilometers. Electricity, signal transmission and monitoring construction has become the difficulty. How safe, clear and low cost to put the images back to the command and control center is the key problem that we want.
To realize the transmission of video signal mainly adopts the following several aspects:
One, stringing laying optical cable transmission, this kind of method for complex terrain non-permanent monitoring is difficult to implement, and early
Input is too big, the cost per kilometer in the city in about 10000 to about RMB 20000, compared with the project is located in the mountains, is obviously not very practical.
Second, through the microwave transmission, need to place a point to point wireless image microwave transmitting equipment, control center to place a wireless microwave receiving device, the one-time investment higher transmission part of the cost is relatively low. This project is located in the mountain barrier laid more large area power is difficult to solve and need to set up a large number of transit, construction and equipment cost is relatively large, and considering the construction monitoring is temporary, so it is not the best choice for us.
Three, use 3 g network, 3 g network is very mature at present, although the terrain construction is mainly for the mountainous area, but we found through monitoring on the spot a test of the 3 g network basic point to point, provided by the 3 g wireless network transmission rate is high, low comprehensive cost, without wiring, short installation period, easy maintenance, strong expansion ability, flexible mobile etc, is fiber optic lines, microwave transmission. 3 g monitoring is currently the most advanced monitoring technology belongs to the future development trend of outdoor monitoring project believe that will be bearing the qin high-speed another bright spot.
Four, video monitoring system
Video monitoring can bring you and your agency intuitive and convenient visual effect. You can sit in your office, you can see the real-time image of the construction site; As long as have mobile phones, computers, you can at any time any place to handle all the field of emergencies, monitor the whole process of the event processing, and can see the scene image effect after processing.
Monitoring system using 3 g wireless network video server, through EVDO wireless network transmission mode, the video signal through the h. 264 coding way, the front of the video signal transmission on the network, the real remote PC video viewing and mobile video view. The system can be up cable networks are not suitable for the special geographical environment, use of the existing EVDO network and the Internet instead of traditional wired video monitoring system for remote target video monitoring.
Security: system have antivirus, prevent wrong operation characteristics, have strong ability of anti-jamming, antistatic, and provide the data backup and restore function. System will also provide the user permissions to protect grade, effectively exclude the interference of man-made factors. Combining with the characteristics of the highway construction, climate conditions and road traffic conditions and user requirements, when we design the monitoring management system to achieve the following goals:
1, the rational allocation of auxiliary support to ensure device and auxiliary light source, etc. Can be all-weather, non-stop to monitor the construction site, the use of video detection technology, accurately record and storage construction video.
2, choose high resolution, low illumination, stability, good industrial camera, its matching lens should choose big aperture, fast, controllable professional lens aperture, shutter speed adjustment. Camera configuration to make sure that the extremely bad weather 40 degrees Celsius below zero under the condition of normal work, can guarantee no matter day or night and various light under the condition of the vehicle images are to be taken by both can see the vehicle, and can see the vehicle plate. Shield adopts automatic temperature adjustment level IP66 waterproof case.
3, the host chooses high performance industrial automation industrial control machine. According to the actual situation of each monitoring system construction point the rational allocation of video acquisition and control device, and had appropriate extension and upgrade of allowance.
4, video, cable in place, receive, plug-in connection is reliable, the power cord and signal lines, control line separate. All cables shall be clearly discernible number or identifier, hidden part of its requirements with galvanized steel pipe set of armor, exposed or bending part requirement with metal hose set of armor. The strength of the bayonet system electrical parts reasonable lightning protection device. Cable and pipeline connection and arrangement, direction, bending and grounding, comply with the relevant state regulations.
5, chassis, equipment protection grade not under IP66 requirements, and has dust, moisture, heat, lightning protection, prevent pests, anti-interference, and other functions.
6, have all kinds of database management and information system (including each function module and power supply) automatic fault diagnosis and automatic alarm (various) alarm prompt way including audio and video form shall have the obvious difference between and remote monitoring, remote maintenance and remote alarm, etc.
7, Chinese interface, simple and intuitive, easy to operate. Each function module (including running parameters, etc.) can be flexible configuration and management according to actual needs.
8, system design, production, construction, testing, operation, maintenance and training work in strict accordance with the provisions of the ISO9000 series of quality assurance system requirements and implementation.
Five, the system structure
A complete set of wireless video monitoring system based on 3 g network and the Internet and run. In the region of the front end of the video monitoring, cameras and wireless network video server, wireless network video server built-in video processing module and EVDO wireless networks 6 collaterals module; Cameras video images, video server will be sent to you by h. 264 video encoding formats to compress video processing, and output two lines of video stream (i.e., double stream output), including all the hd video streams for the front-end video footage; Another way of CIF format video streaming, by EVDO wireless network module, video transmission to the streaming media server do transfer processing, go back to the supervision center, supervision center can see the front the real-time video images of point to point. At the same time, can through the phone (GPRS/EDGE) login way, realize the mobile video view. In addition, the wireless network video server provides audio interface, can external recording device (microphone), which can realize remote monitoring of sound recording and sound.
1, the front part
The front-end is mainly composed of camera, and the entire front of lightning protection, the mounting bracket and infrastructure.
Camera user can demand according to the actual situation, adopt appropriate site environment of the camera. As can be configured: the infrared camera, all-in-one PC camera, mini cameras, high-speed ball, etc. In order to achieve better video effect, generally USES the camera to the sharpness of the need to more than 480 TVL.
2, transfer Part,
3 g wireless video server, 3 g wireless network card, video storage disk, distribution box, prevention of jammer and infrastructure.
Wireless network video server support video points have single and 4 of the road, according to the front of the camera points, the configuration of the corresponding equipment. If more than four way video, need to add a wireless network video server.
Front end each point to point wireless network video server are equipped with SD card to store the video image, the highest support SD card 16 gb, can continuous loop video 8-10 days.
3, the central part
Monitor command center is the control of the whole system, image display, image video center, monitoring center system of intelligent image analysis, can only alarm function, can to command and dispatch personnel to provide comprehensive, clear, actionable, recording, playback on-site real-time image. PC can realize remote network video viewing and remote mobile video view, equipment for the code flow design, the main stream for local video storage, video format for CIF format (or format) D1 25 frames/SEC. Time code flow through wireless network transmission, PC and mobile phone can see the front of the remote video images. On the PC and mobile phone video effect for the CIF format 15 frames per second.
4, the monitoring center configuration instructions supervision center room is mainly real-time view, understand the front-end monitoring site taken by video images. Monitoring center of the main equipment includes: 2 sets 42 inch LCD TV, the computer 2 sets, 1 center management server, the light of broadband, video platform software. Equipped with 2 computer, mainly for the front-end transmit to point to point video decoder, video signal and 42 inch LCD TV display. In the front of each wireless network video decoder transmission stream scope is: 32 KBPS to 2500 KBPS, currently USES is CDMA transmission mode, so the scheme set of stream size of 64 KBPS, image frames of 15 frames per second. The monitoring center equipped with optical fiber broadband can completely meet the demand of 600 video online transmission at the same time.
