List of high-quality authors
On December 14, with the successful pouring of the last concrete, all 41 large-diameter variable-section ultra-deep bored piles of the No. 5 main pier of Qinglongmen Bridge were poured, marking the phased victory of the construction of the world's largest three-tower steel box girder cable-stayed bridge, and laying a solid foundation for the subsequent decentralization of the main pier steel gondola and the construction of the main pier bearing cap.
Construction of the No. 5 main pier
The 41 main pier foundations of Qinglongmen Bridge No. 5 have a diameter of 35-3 meters variable cross-section bored piles, all of which are large-diameter variable cross-section ultra-deep bored piles, with a single pile length of up to 112 meters, and a total of 41 bored piles with a total of 36,765 concrete pouring9 cubic meters. In view of the large diameter and large number of bored piles, and they are all variable cross-section rock-socketed piles, and it is difficult to identify and verify the bearing layer at the bottom of the pile, the project management team continuously improves the technical plan, and finally formulates the double drilling rig drilling measures with small improvements and big achievements, and the increased pump suction reverse circulation drilling rig not only effectively accelerates the drilling speed before entering the rock, but also effectively accelerates the drilling speed of the rotary drilling rig in the strong weathering and medium weathering layer.
Pumping concrete
In order to improve the construction efficiency, the project department innovates the construction technology, adopts the double drilling combination process of "pump suction reverse circulation drilling rig + rotary drilling rig", adopts different drilling methods for different geological stratifications, reasonably adjusts the mud specific gravity, drilling speed and drilling pressure, optimizes the drilling process to control the speed and quality of the hole, and the "double drilling convergence" greatly improves the work efficiency, and the inclination and reaming rate are greatly controlled, which effectively ensures the quality of the hole and ensures that the construction period is completed on schedule.
Renderings of the Qinglongmen Bridge
The second phase of the Liuheng Bridge project is the first world-class extra-large sea-crossing highway bridge project contracted by the group company, which fills the performance gap of the group company and even the joint-stock company's long-span bridge. As the key control project of the project, the Qinglongmen Bridge is the world's largest three-tower steel box girder cable-stayed bridge, with a double main span of 756 meters*2, spanning the Qinglongmen Waterway.
Renderings of the Liuheng Highway Bridge
Liuheng Bridge is the people's heart bridge that the people of Zhoushan are looking forward to, and it is of great significance to realize the linkage development of the port area and industries of Liuheng Island, Fodu Island and Meishan Island. Approaching the Spring Festival, the project department worked hard to successfully complete the pouring of bored piles for the Q5 main pier of Qinglongmen Bridge.
In the next step, all the employees participating in the construction will live up to their mission, strengthen their responsibility, adhere to overall planning, strengthen their confidence and determination, solidly promote various tasks, complete the construction task of Liuheng Bridge on schedule, and contribute to the high-level construction of Zhoushan as a modern marine city(Zhang Yihao).