The first lower crossbeam of the main tower pier of the Hongqili Waterway Road-Rail Bridge on the Shenzhen-Jiangmen Railway has been poured.

　　Recently, the first lower crossbeam of the main tower pier of the Hongqili Waterway Road-Rail Bridge on the Shenzhen-Jiangmen Railway was completed. The project is managed by Xiamen-Shenzhen Railway Guangdong Co., Ltd., designed by China Railway Siyuan Survey and Design Group, and constructed by China Railway Major Bridge Engineering Group. Construction is about to proceed to the middle tower column.

　　The newly built Shenzhen-Jiangmen Railway has a main line length of approximately 116 kilometers. The main bridge of the road-rail combined section of the Hongqili Waterway in Section 8 of the Shenzhen-Jiangmen Railway, constructed by China Railway Major Bridge Engineering Group, is 1.41 kilometers long with a main span of 808 meters. It is the world's first road-rail combined cable-stayed bridge with super-short side spans and a steel-concrete box-truss composite girder, and is one of the key control projects of the entire line. The upper deck of the bridge carries an eight-lane urban expressway, while the lower deck carries a four-track high-speed railway.

　　The lower crossbeam of Main Tower Pier No. 49 poured this time has a total length of 59 meters, a width of 17.2 meters, and a height of 10 meters. It is a C60 high-strength prestressed concrete structure with a total volume of 6,000 cubic meters, poured in two stages. The cross-section of this lower crossbeam is large, and controlling the quality of mass concrete is the main challenge during construction.

　　The project department actively communicated and cooperated fully with design and research units, gave full play to the strength of the back-office technical support team, carried out technical research and process innovation, and accurately calculated the staged pouring heights. By prestressing part of the lower crossbeam in advance, optimizing the support structure's load conditions, and improving the concrete's crack resistance; and by adopting dual-admixture technology to optimize the concrete mix proportion, strictly controlling the source quality of raw materials, lowering the concrete placement temperature, using an intelligent temperature control system, and strengthening the standardization of vibration processes, the quality of the mass concrete has been comprehensively improved.