on February 16, the No.5 pier of Xihoumen Highway and Railway Bridge of Yongzhou Railway, designed by China Railway Bridge Institute of Shanghai-Hangzhou Passenger Dedicated Railway Company and constructed by China Railway Bridge Bureau, arrived at the bridge site from the floating drilling platform.
This marks the beginning of the construction of the main tower pier of the world's largest highway and railway bridge, known as the "railway version of the Hong Kong-Zhuhai-Macao Bridge".
Why Do We Have to Work Hard to Transport a "Steel Fortress"? The main span of Xihoumen Bridge
on Yongzhou Railway is 1488 meters, which is the largest cable-stayed suspension bridge under construction in the world. Cable-stayed suspension cooperative system absorbs the advantages of large stiffness of cable-stayed bridge and stronger spanning capacity of suspension bridge, especially in kilometer-class long-span and heavy-duty bridges. Compared with single structural bridge type, in the case of the same material and technology, the span is easier to be enlarged, and the smoothness of high-speed rail crossing the bridge is better and the safety is higher. Xiao Haizhu, chief engineer of China Railway Bridge Institute and chief designer of Xihoumen Rail-cum-Road Bridge on Yongzhou Railway, said.
However, in front of the builders, there are strong winds, Rapids, bare rocks and deep water. Under such conditions, piling can be described as "hell difficulty". Li Yongqi, executive deputy manager of Xihoumen Highway and Railway Bridge of
China Railway Major Bridge Engineering Group Co., Ltd., said: We propose to adopt a self-floating steel truss drilling platform adapted to the conditions of bare rocks in deep water of the ocean. The platform is composed of steel piles and steel frames as the main load-bearing structure and has the function of self-floating. After the platform arrives at the pier, fixed legs are set up to form a "bench" drilling construction platform, which transforms water construction into land construction, saves the cost of large barge transportation at sea, reduces the interference of cable collection system operation at the pier, improves the efficiency of drilling operation and ensures the safety of drilling platform, which is the first attempt in bridge construction in the world.
In this way, with the design and construction scheme of pile foundation, the manufacture of self-floating drilling platform is advancing rapidly. With strict technical control and the full cooperation of manufacturing personnel, the platform was processed in the dock of Jinhai Heavy Industry in February. Only after the monsoon period, the platform can be floated to the pier position, and the pile foundation construction of Pier 5 can be officially started.
is about 30.
The drilling platform weighs 7600 tons." It is equivalent to the weight of 760 adult African elephants, with a plane size of 13000 square meters and an area equivalent to 31standard basketball courts. China Railway Bridge Engineering Group Co., Ltd. actively communicated with the meteorological department to understand the weather conditions during the floating operation, and entrusted the maritime department to do a good job in the supervision of the channel and the guidance of navigation ships during the construction period. The floating resistance calculation, the floating tug configuration calculation and the floating bollard calculation of the platform were carried out to ensure the feasibility of the floating operation scheme; According to the obstacles of the floating route, a detailed operation schedule was formulated, leaving Jinhai Heavy Industry Shipyard at the end of the rising tide, passing through Xiushan Bridge and Zhoudai Bridge during the slow flow at the end of the rising tide, and arriving at the site at the low tide; In order to ensure the quality of positioning operation, the platform uses the self-developed real-time positioning system and Beidou positioning system for positioning, and installs two GPS and two tilt sensors to obtain the platform tilt attitude and position information data in the positioning process in real time. In addition, a "wind, wave and current environment monitoring system" is established on the construction site to monitor the wind environment, tidal current and wave conditions in real time, and to monitor the stress and deformation of the construction platform and bridge structure, so as to ensure the safety of the bridge structure and construction personnel.
In order to ensure the smooth completion of the bridge, China Railway Bridge Institute and China Railway Bridge Bureau, two units with many brilliant achievements and profound experience in the field of bridge construction, have formed a "bridge-building group" to escort the "railway version of the Hong Kong-Zhuhai-Macao Bridge" from their respective professional fields, and strive to build the landmark project of China's high-speed railway cross-sea bridge.
On the same day, CCTV News made a live report on the first application of domestic self-floating drilling platform in world-class bridge construction.
Project Link
of Yongzhou-Zhoushan Railway is a key control project of the whole line, with large scale, novel bridge structure and high technology content. It is a super cross-sea project that challenges the limit and attracts worldwide attention. After the completion of the bridge, it will become a landmark project of China's high-speed railway cross-sea bridge.
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