An earthquake-proof ＂artifact＂ came out in Xi ‘an, which can isolate 80% of earthquake energy.

　　Cctv newsTen days ago, earthquakes of magnitude 7 and 6.6 occurred in Jiuzhaigou, Sichuan and Jinghe, Xinjiang, respectively, causing casualties and property losses. Are there any effective ways to reduce casualties and property losses caused by the earthquake? The answer is yes. The reporter recently learned from the Fourth Academy of Aerospace Science and Technology that an earthquake-proof "artifact" was successfully developed in 41 institutes of the Institute.

Illustration: The anti-seismic effect of traditional anti-seismic technology and fake bearing after earthquake isolation.

　　The traditional anti-seismic technology is to firmly connect the superstructure and foundation of a building, so that the earthquake energy can still vibrate and deform the structure after being transmitted to the superstructure, and when the force exceeds the strength of the building structure, it will be destroyed or even collapsed.

　　The isolation technology refers to setting isolation layer between the superstructure and foundation of the building without changing the original architectural design scheme, that is, placing rubber isolation bearings. The vertical bearing capacity of the isolation layer is large, but it is soft in the horizontal direction. When the earthquake comes, it can isolate about 80% of the energy of the earthquake, which can effectively reduce the deformation caused by the acceleration response of the upper structure of the building caused by the earthquake, thus reducing the damage to the building caused by the earthquake.

　　Since 2014, the Ministry of Housing and Urban-Rural Development has issued a document stating that the housing and urban-rural construction departments of all provinces and autonomous regions need to promote the application of seismic isolation technology in an orderly manner to ensure the quality of the project. Subsequently, Gansu, Xinjiang, Qinghai and other high-intensity areas made it mandatory. All high-intensity areas with seismic fortification intensity of 8 degrees or above and 4-12-story school teaching buildings, student dormitories, hospital medical rooms, kindergartens, airports and other crowded public buildings rebuilt after the earthquake must be designed with base isolation technology. At present, about 7 billion square meters of building area under construction in China need to use seismic isolation equipment.

Schematic diagram of laminated rubber isolation bearing developed by No.41 Institute of No.4 Institute of Aerospace Science and Technology Picture provided by No.4 Institute of Aerospace Science and Technology.

　　After more than two years’ research, the 41 Institute of the Fourth Academy of Aerospace Science and Technology has successfully developed a laminated rubber isolation bearing, which is made up of a layer of steel plate and a layer of rubber, and the rubber and steel plate are firmly bonded together after processing, with sufficient rigidity and vertical bearing capacity, small horizontal rigidity and large horizontal deformation capacity.

　　"The products developed by 41 are in strict accordance with the national standards, fully combined with the design technology and process technology of flexible joints of solid rocket engines, and have their own characteristics. The overall indicators of the products are at the same level as those of similar domestic products. The series of products have passed the type inspection of isolation products designated by the state in Huazhong University of Science and Technology, and have fully met the market demand." Introduction of 41 scientific researchers from the Fourth Academy of Aerospace Science and Technology.

　　It is reported that the design method, rubber material, adhesive, molding process, process control and product performance of this isolation bearing have been improved due to the guarantee of aerospace technology, which can ensure that the vibration period of the building is extended by 2-3 seconds or more, thus avoiding greater damage caused by co-frequency resonance. At the same time, the bearing also has proper damping and stable elastic reset function, as well as good durability and fatigue resistance.

　　The researchers said that due to the optimization technology and molding control method of military products, the individual indicators and product quality reliability of this isolation bearing are better than those of similar domestic products. "However, due to the late start, there is still a gap between China and Japan, the United States and European countries in the field of seismic isolation products, especially the series of large-diameter products over 1.5 meters is still blank. These directions are also the direction of our follow-up efforts."

　　In 2017, in the "Shaanxi Youth Scientific and Technological Achievements Transformation Promotion Conference", the newly developed isolation bearings were selected into 22 integration of defense and civilian technologies projects screened and released by Shaanxi Province.