en.Wedoany.com Reported - On April 30, as the final cubic meter of concrete was precisely placed, the Jiangjiagou Extra-Large Bridge on the Mianyang-Suining-Ziyang-Neijiang Railway project, constructed by China Railway Construction Bridge Engineering Bureau Group Co., Ltd., was successfully closed. The Jiangjiagou Extra-Large Bridge is located within Daying County, Suining City, Sichuan Province, China. It has a total length of 560.6 meters and uses a continuous beam with a 100-meter main span to cross the Suining-Daying Expressway, with a minimum clearance of 16.97 meters from the bottom of the beam to the existing road.
This bridge is a major and challenging project on the Mianyang-Suining-Ziyang-Neijiang Railway. Construction faced significant organizational difficulties, high quality standards, prominent risks associated with construction over an active road, and extensive utility relocation. The project team established a standardization-led overall approach from the start of construction. For the closure process, they organized expert reviews to optimize the specialized plan and strictly implemented safety planning and three-level technical disclosure. During construction, standardized industrial equipment for prestressing and rebar positioning was fully utilized, combined with a full-time supervision system for key processes. Real-time monitoring of the bridge structure's alignment and stress ensured the safe passage of traffic on the expressway below during the continuous beam closure.
Facing technical challenges such as the complex stress system conversion during continuous beam closure and high precision control requirements, the project team adopted the mature technique of cantilever casting using form travelers combined with temporary rigid locking, supplemented by precise counterweighting, low-temperature closure, and symmetrical pouring. In terms of environmental protection and intelligent technology, waste concrete test blocks were simply processed and used as counterweights for the form travelers, achieving resource utilization of solid waste. Intelligent tensioning equipment, relying on cloud-based data collection, enabled automation and transparency throughout the entire prestressing tensioning process. An integrated protection system featuring external platforms and standardized railings further enhanced the safety level of high-altitude edge work.
The successful closure of this continuous beam has opened the transportation corridor for the beam segments in the initial erection direction. The Mianyang-Suining-Ziyang-Neijiang Railway is a key project in the national medium- and long-term railway network plan and the special plan for rail transit in the Chengdu-Chongqing Economic Circle. Once completed and operational, it will end the history of Santai County and Shehong City having no railway access.
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