Blasting, Volume. 42, Issue 3, 126(2025)
One-time Combined Blasting Demolition of Cross-Line Overpass Group in Long Section of Expressways
In the reconstruction and expansion projects of expressways, a large number of cross-line bridges cannot meet the development needs of modern transportation and are facing demolition and reconstruction. Traditional manual and mechanical demolition methods have drawbacks, including low efficiency, prolonged timelines, and substantial traffic interference. In contrast, blasting demolition-with its inherent benefits of safety, economic viability, and operational efficiency has emerged as the optimal technique for dismantling cross-line bridges on expressways. Based on the reconstruction and expansion project of the section from the Hubei-Henan boundary to Junshan on the Beijing-Hong Kong-Macao Expressway, one-time combined blasting demolition was carried out on five cross-line bridges in the K1018+990~K1048+550 section. Through the quantitative design, fine construction, and multidimensional protection of four types of bridges-such as equal-section catenary hingeless arch bridges, inclined-leg rigid frame bridges, half-through arch bridges, and steel frame arch bridges-the goal of safe and efficient blasting demolition was realized. The practical results show that the collapse mode and disintegration effect of the bridge can be effectively controlled by reasonably designing the blasting cut and initiation sequence. The distributed cooperative detonation system, based on radio communication, overcomes the spatiotemporal coordination problem of synchronously detonating group bridges over a long interval. The protection measures of ‘covered protection+near body protection’ were adopted to control the splash of individual flying debris effectively. The ‘rigid support layer+elastic buffer layer’ protection system effectively prevents the impact damage of the bridge collapse on the high-speed pavement. The engineering practices presented herein demonstrate that through meticulous design, synchronized control strategies, and multi-tiered protective measures, the safe and efficient demolition of cross-line bridge groups across extensive expressway sections in complex environments can be accomplished.
Get Citation
Copy Citation Text
SHEN Dian-dong, ZHOU Zi-zheng, YU Xin, JIA Yong-sheng, LIU Bo-ping, HUANG Xiao-wu, JIANG Hai-guang, CAI Qin-feng. One-time Combined Blasting Demolition of Cross-Line Overpass Group in Long Section of Expressways[J]. Blasting, 2025, 42(3): 126
Category:
Received: Mar. 19, 2025
Accepted: Sep. 18, 2025
Published Online: Sep. 18, 2025
The Author Email: JIA Yong-sheng (jason03566@163.com)