Lushan Building is strong and restored. Its isolation technology is worth promoting.
The Lushan County People's Hospital Complex, which was dubbed by the netizens as “Building Strong”, has been subjected to the Lushan earthquake test due to the building orientation and the 83 rubber isolation bearings used in the building, in promoting the building isolation technology. Has important value.
No cracks in the load-bearing wall
The comprehensive building of Lushan County People's Hospital was more than ten kilometers away from the epicenter. When the reporter visited, it was found that although there were traces of ceramic tiles falling on the inner wall of the building, there was no crack in the load-bearing wall. The window was intact, the building was flooded with electricity, and was used by the government as an emergency after the earthquake. Refuge and ambulance center.
Liang Wei, chairman of Sichuan Jianye Engineering Quality Inspection Co., Ltd., said that he was entrusted by the Sichuan Provincial Department of Housing and Construction. He took several experts to test the building layer by layer, and initially ruled out the danger and suggested to resume use. “The main structure of the building is safe, and some envelope structures and non-load-bearing structures need to be repaired, but it does not affect normal operations,” he said. At present, some departments such as the Obstetrics and Gynecology Department and Laboratory of Lushan County People's Hospital have begun to prepare to move back from the tent to the building.
Rubber isolation bearing
It is reported that the "Fengjianqiang" design meets the seismic requirements of 8 degrees of intensity. The intensity of the Lushan earthquake reached 9 degrees, exceeding the design requirements. Liang Wei explained that this is closely related to the short-term construction of the building facing the source direction and some damping techniques used. Liang Zhenyu, technical director of Sichuan Huayuan Construction Engineering Co., Ltd., who built the project for the construction of the hospital complex, said that they designed 83 rubber isolation bearings with a diameter of 500mm and 600mm between the foundation and the ground building. "Once the earthquake occurs, the isolated structure will concentrate the deformation of the building on the isolation layer, preventing the seismic wave energy from propagating from the bottom to the top, so that the layers of the upper structure will not be deformed substantially, thereby protecting the ground building structure from being destroyed. By comparing with adjacent buildings, Lushan County Hospital was much less damaged by the earthquake."
Liang Zhenyu said that some buildings use rubber isolation technology, which does not mean that the cost must increase, and sometimes it may be reduced. For example, saving the amount of reinforced concrete used in the building, etc., is “saving more money on the foundation and saving on the ground. Big money." In the construction cost of Lushan County Hospital, the isolation bearing only accounts for about 5% of the project cost, but it will increase the seismic intensity of the ground building by 1 to 2 degrees.
Liang Zhenyu said that the isolation bearing is the most widely used isolation technology.