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The nation’s first DF30/120 integrated bridge-erection machine, pioneered by Xindafang, has been fully assembled and is poised to enter service.
Xin Dafang News: Recently, China’s first domestically developed DF30/120 integrated bridge-erection machine, independently researched and designed by Xin Dafang, has been fully assembled on site and is poised to be deployed in the expansion project of the Shantou–Lufeng to Shenzhen–Longgang section of the Shenyang–Haikou National Expressway, undertaken by China Railway Fourteenth Bureau Group.
In accordance with the “Green Bridge” construction requirements and leveraging prefabrication at the factory combined with on-site assembly techniques for urban expressways, elevated bridges, and other bridge structures, Xindafang has developed an intelligent bridge-erection machine capable of fully prefabricated bridge construction. This machine breaks through conventional limitations by integrating advanced intelligent control of composite operations between the front and rear gantry cranes; powered by 5G network communication technology, it enables precise adjustment and positioning throughout the erection process of all bridge components. It effectively addresses the longstanding technical challenge of using a single piece of equipment to simultaneously erect pier shafts, cap beams, and the entire bridge superstructure, making it China’s first integrated bridge-erection machine.
The integrated bridge-erection machine consists of a main girder composed of twin truss girders and connecting girders, four support legs, a front trolley, a rear trolley, a mobile platform, ancillary structures, a hydraulic system, and an electrical system. It can be used for the installation of piers and cap beams, is suitable for erecting and installing box girders and double-T girders with spans of 30 meters or less, and is also capable of erecting standard 40-meter-span, 160-ton highway girders.
Its advantages are as follows:
1. Expand the functions of standard bridge erectors
Erecting precast piers and cap beams; suitable for erecting precast bridges on routes with pier and cap-beam structures; suitable for erecting ordinary highway bridges;
2. Enhance the operational efficiency of standard bridge-launching gantry cranes
Three work fronts operate simultaneously: at the front, pier columns and cap beams are installed; once these are completed, wet-joint grouting is carried out and the concrete is allowed to reach its design strength, while at the rear, precast girders are erected. The integrated erection machine is equipped with lifting, positioning, and installation functions for pier column corbels (used for temporary support and fixation of the piers) and cap-beam clamps (used for temporary support of the cap beams), eliminating the need for additional lifting equipment. The machine’s overall transverse passage is driven by a roller-truck system, ensuring excellent stability during transit and strong adaptability to longitudinal grades. Its multi-leg, automatically suspended traveling mechanism requires no bridge-deck track laying, enabling continuous operation and high levels of equipment automation. During the erection of pier columns and cap beams, intelligent positioning systems such as RTK navigation and laser positioning are employed. All of these features significantly enhance construction efficiency.
3. Enhance construction safety
During the construction of the integrated machine, the RTK intelligent navigation initial positioning system is used to guide the operation of the overhead crane, bringing the pier column into the laser precision positioning range, where the laser precision positioning system then guides the precise placement of the pier column. In addition, the integrated machine’s movements are controlled via a remote control, reducing the time personnel spend observing and operating at close range and thereby enhancing safety.
Background: The Shantou–Lufeng to Shenzhen–Longgang section of the Shenyang–Haikou National Expressway is part of the “Two Verticals” corridor in the national expressway network plan for the G15 Shenyang–Haikou National Expressway, and also forms the fifth horizontal axis within Guangdong Province’s “Ten Verticals, Five Horizontals, and Two Rings” expressway backbone. It serves as a major transportation artery connecting eastern Guangdong with the core area of the Pearl River Delta. The Shenzhen–Shantou–Xiamen Expressway begins in Tanxi Town, Lufeng City, and ends in Longgang District, Shenzhen, with a total length of 146.55 km. The TJ9 contract section served by Xindafang starts in Meilong Town, Haifeng County, and terminates at the Ping’andong Reservoir in Meilong Town, Haifeng County, spanning a route length of 4.047 km from chainage 0+000 to 4+047.
Keywords:
Df30, erection, bridge-launching girder, bridge, positioning, expressway, simultaneously, construction, prefabrication, national
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