◎ Science and Technology Daily reporter Yong Li intern Shan Qianlan
"Bang bang bang", just in the winter Olympics simulation stand built by Chongqing University, suddenly 8 men jumped up together, and the safety operation and maintenance monitoring system on the scene immediately sounded an alarm; whether the temporary facility scaffolding latch was in place, the drone swept it and knew... On December 30, 36 days countdown to the Winter Olympics, the reporter walked into the structural laboratory of Chongqing University to reveal the "black technology" of Chongqing University's "Science and Technology Winter Olympics" team to escort the safety of a large number of temporary facilities for the Winter Olympics.
Video production: Science and Technology Daily reporter Yong Li intern Shan Qianlan Zhou Weiwei
Small latches are related to great security Drones are known in one sweep
In the Beijing Winter Olympics, in addition to a small number of permanent venues such as speed skating halls and ice cubes, the event support infrastructure including spectator stands, broadcast towers, bridges, LED screens, toilets, temporary rooms and other event support facilities are temporary facilities, and they are all in cold, mountainous and strong wind conditions, so ensuring the safety of facilities is the top priority.
At the scene, a drone hovered around the temporary facility, and it was clear at a glance whether the latches of the key parts of the scaffolding were installed in place.
Researchers from Chongqing University's "Science and Technology Winter Olympics" team inspect monitoring instruments on temporary facilities such as frames. Yongli/Photo
The key parts of the temporary facilities of the Winter Olympic frame are fixed and connected by the latch, and determining whether the latch is installed in place is the basis for determining safety, only in the Yanqing competition area, such a small latch is as many as 100,000 pieces, so many latches if manually tested both time-consuming accuracy and difficult to guarantee.
In this regard, the School of Civil Engineering has developed a set of equipment based on rapid detection of drones, which can quickly scan the entire scaffolding as the drone flies. Since each latch is pre-coated with a unique reflective material, once there is a situation where the installation is not in place, it can be identified by the drone and the feedback can be seen immediately in the display. In this way, time and manpower are saved, and the safety and stability of temporary facilities are guaranteed to the greatest extent.
Real-time monitoring system to pulse the "health" status of temporary facilities
How can the safety of temporary facilities be mastered during the Winter Olympics? "We have developed a monitoring system for the safe operation and maintenance of large-scale high-capacity temporary facilities under the complex terrain of severe cold mountainous areas." Professor Liu Gang, a member of the "Science and Technology Winter Olympics" team of Chongqing University and the School of Civil Engineering, introduced that by installing environmental sensors such as temperature and humidity on temporary facilities, as well as structural response sensors such as vibration, inclination and strain, the status of the temporary stands is monitored in real time and "health examination" is carried out at any time.
"Normal walking around will not trigger the alarm, like this several people jump together to alarm." Sun Rui, associate professor of the School of Civil Engineering of Chongqing University, said that the system can accurately distinguish the various conditions encountered by temporary facilities. In Zhangjiakou and Yanqing, the team installed a total of 30 sets of equipment to monitor the safety of temporary facilities, and the equipment will not be dismantled until after the end of the Winter Olympic and Paralympic Games, during which all the monitoring data will be sent to the on-site operation and maintenance personnel in real time to maintain the temporary facilities in a timely manner.
Chongqing University developed a large-area high-capacity temporary facility safety operation and maintenance monitoring system under the complex terrain of severe cold mountainous areas. Yongli/Photo
Fast processing technology Race base deformation can be maintained in a timely manner
"The climate of the Place where the Winter Olympics will be held is harsh, the depth of frozen soil can reach more than 0.85 meters, and the foundation is likely to be deformed by landslides and collapses due to temperature changes." Professor Yang Zhongping of the School of Civil Engineering introduced that the Winter Olympic Games need to build a large number of large-scale, high-capacity high-soft temporary structures on the complex slope terrain of the mountainous area, such as temporary stands, temporary broadcast towers, temporary houses, etc. If there is a deformation of the foundation how to ensure the safety of the building, the rapid processing technology they developed can come in handy.
It is understood that combined with the characteristics of the site foundation soil and the characteristics of the upper load, the "Science and Technology Winter Olympics" team of Chongqing University has developed a patented technology for the rapid treatment of freeze-thaw cyclic frozen ground foundation suitable for large-area complex structural loads in cold mountainous areas. In addition to significantly improving the bearing capacity of the new pile developed, the biggest feature is that the pile body uses isolation sleeve design in the deep permafrost layer section, which isolates the central bearing steel pipe from the surrounding frozen soil, eliminating the impact of frost expansion and thawing of the foundation soil. In particular, the pile body adopts spiral blade design, which is convenient for mechanical screw drilling into the construction, so as to achieve rapid and weak disturbance construction, single pile construction only takes more than ten minutes, and can be reverse screwed for recycling. This technology has the characteristics of eliminating the impact of frozen soil, efficient construction, green recyclability, etc., and can be used as a foundation disposal measure to ensure the safe operation of temporary facilities, and can also be used as an emergency disposal measure.
Researchers from the Winter Olympics team of Chongqing University introduced the patented technology of rapid treatment of frozen ground foundations against freeze-thaw cycle. Yongli/Photo
"We give full play to the advantages of the discipline and make a 'significant' contribution to the Winter Olympics." Professor Yang Qingshan, head of the "Science and Technology Winter Olympics" team of Chongqing University, said that Chongqing University took the lead in undertaking a number of topics and tasks in the key special projects of the "Science and Technology Winter Olympics", in addition to the safety of temporary facilities for the Winter Olympics, it also undertook the "Beijing-Zhang high-speed rail supporting visual full program design technology demonstration for the Winter Olympics" and "the impact assessment of environmental elements of the snow project site and the on-site decision-making auxiliary support system" and other projects, providing scientific analysis and decision-making basis for China's snow sports athletes and coaches, highlighting the Olympic spirit and Chinese culture.
Source: Science and Technology Daily The picture in the article was taken by Yong Li, a reporter of Science and Technology Daily
Editor: Wang Yu
Review: Julie
Final Judge: Liu Haiying