On December 20, the reporter learned from the China Environmental Protection Industry Association that the Beijing-Xiong Inter-city Railway fully enclosed sound barrier project undertaken by China Railway Shanghai Engineering Bureau was recognized as the "Key Ecological Environmental Protection Technology Demonstration Project in 2021."
As an emerging technology, “noise reduction earphones” have already come close to the public’s sight. Taking the earphone concept of “noise reduction” as an extension, high-speed rail builders have innovatively designed the world’s first fully enclosed sound barrier suitable for 350km/h high-speed rail. project.
The unique "tunnel" fully enclosed shape and the comprehensive application of multiple technologies have realized the "silent" passage of high-speed trains through residential areas, putting a pair on the national strategic trunk line-the Guba Bridge of the Beijing-Xiong Intercity Railway. Noise-canceling headphones".
Different from common highway noise barriers, the appearance of Jingxiong sound barrier is more like a tunnel on a high-speed rail.
The main structure of the project adopts 435 round steel beams, and the steel beams form a stable unit through inter-column supports and tie rod auxiliary structures; the builders make and install metal sound barrier unit panels according to the measured distance between adjacent columns, and adopt a stereotyped seal The blocking piece blocks the bottom gap and the gap between the beam ends to avoid "gap vibration" caused by the airflow, forming a fully enclosed structure of "sound-proof tunnel".
When the train passes at a speed of 180-385km/h, when the noise generated is penetrating the metal sound barrier unit plate, it is absorbed and filtered by the sound-absorbing material embedded in the aluminum alloy shell, and the loss value can reach 19.0-21.1dB(A), reaching It has a good sound insulation and noise reduction effect.
According to reports, the sound barrier innovation adopts an assembly construction process. The main structure of the large-section component is split into three segment components. The centralized welding process is carried out in a standardized factory far away from the residential area, and the processed main steel arch is then processed. The rack is transported to the reconstructed beam-making yard for intelligent secondary assembly.
On the one hand, the centralized layout of temporary electricity consumption is realized through factory construction, which reduces production energy consumption and improves energy utilization; on the other hand, the project department introduces low-noise equipment, intelligent welding robots, welding fume purification and exhaust gas treatment equipment in the processing process. Advanced technology effectively reduces secondary pollution such as noise and exhaust emissions, and minimizes the impact of construction and production on the surrounding environment.
"Not only that, we use BIM technology to optimize the design of nodes, and use embedded parts precise positioning technology to ensure construction accuracy. We use wind tunnel simulation, numerical simulation, finite element analysis technology and 4 million fatigue tests to ensure that the project quality is fully up to standard. In the end, energy saving and material saving, cost reduction and efficiency increase have been realized.” said Zhang Tengfei, chief engineer of the project.
"The Jingxiong sound barrier project has a novel structural design and obvious noise reduction effect." Chang Zhongnong, an inspector from the Department of Environmental Impact Assessment and Emission Management of the Ministry of Ecology and Environment, conducted a field survey of the project in May this year and visited the villagers of Beiluodian Village. That's it.
Correspondent Chen Zhehao, reporter Chen Xi