China News Service, Guangzhou, October 13 (Cai Minjie, Yang Dehui, Zhang Pu) On the 13th, after more than 10 hours of continuous operation, the first full-width TY-type pier of the Huangmaohai Passage Project was completed, and a breakthrough was achieved in the construction of the approach bridge in the sea area of the project. sexual progress.
The TY-type composite pier of the project is the first to be used in bridges with sub-sections of expressways in my country.
The Huangmaohai Passage Project has a total length of 31 kilometers, of which the sea-crossing section is about 14 kilometers long. It is mainly composed of the world's largest three-tower cable-stayed bridge-Huangmaohai Bridge, Gaolangang Bridge and Shui Zhongdong, Middle and West Approach Bridges. composition.
Among them, 19 full-width TY-type composite piers, such as auxiliary piers, transition piers and middle approach piers of Huangmaohai Bridge and Gaolangang Bridge, were constructed by the China Railway Bridge Bureau Huangmaohai Sea-crossing Channel T4 Contract Section. The maximum height of the pier body is Up to 62 meters, the length of the cover beam is 37.4 meters.
The first full-scale TY-shaped pier of the Huangmaohai Passage Project in the Greater Bay Area has been completed Photo courtesy of Guangdong Provincial Communications Group
According to Sun Wenjin, manager of the safety production management department of the Huangmaohai Channel Management Center: "The Huangmaohai Channel project is located in a typhoon-prone area, and the waters where floods and tides intersect violently, and ships at sea are busy. Type solid piers can effectively reduce the water resistance ratio and significantly improve the anti-ship collision capability of the piers. In addition, according to the experience of the whole-width bridge piers in previous projects, the use of TY type composite piers can effectively reduce the length and weight of the cantilever of the cover beam, and meet the structural requirements. On the basis of strength, it can achieve a beautiful and stable effect.”
The first full-scale TY-shaped pier of the Huangmaohai Passage Project in the Greater Bay Area is completed Photo by Zhang Pu
The key node in the construction of the whole-type TY-type composite pier is the construction of the cover beam. Based on the structural stress and the overall landscape design of the project, the Y leg adopts a variable-section arc shape, and the inclination angle is 45 degrees. There are 37 types of steel bars used, which greatly increases Due to the difficulty of steel bar processing and on-site binding, it is necessary to solve the problems of high-altitude large cantilever cover beam bracket stress, safety protection settings and construction efficiency.
"In order to ensure the safety, quality and ergonomics of the construction of the structure, the project carried out a special structural design for the composite pier through the 'three simultaneous' measures of synchronous design, synchronous manufacturing, synchronous installation and acceptance of the safety protection structure and the main structure of the bracket, and commissioned The third-party unit reviewed the construction plan, and organized and implemented the construction plan after internal audit and expert review and demonstration to ensure smooth operation channels and safety of personnel working at heights. During the construction process, the pier body and the cover beam were constructed in parts and in strict accordance with the requirements of the specification. Carry out piling load preloading and stress monitoring of key stress-bearing parts, as well as the mechanism for inspection and acceptance of the compaction process." said Liu Hongda, project leader of the China Railway Bridge Bureau Group.
The first full-scale TY-shaped pier of the Huangmaohai Passage Project in the Greater Bay Area has been completed Photo courtesy of Guangdong Provincial Communications Group
The Huangmaohai Passage Project is another sea-crossing project in the Guangdong-Hong Kong-Macao Greater Bay Area. At present, all work is progressing smoothly. The key control projects of Huangmaohai Bridge and Gaolangang Bridge are more than half of the tower construction, and the sea is "small waist". It has grown to the waistline, and the trend of Dinghai reaching the sky is beginning to show.
The project is expected to be completed and opened to traffic by the end of 2024. After completion, it will form a cross-sea and cross-river channel group in the Greater Bay Area together with the Hong Kong-Zhuhai-Macao Bridge, the Shenzhen-Zhongshan Bridge, the Nansha Bridge and the Humen Bridge, helping the Greater Bay Area to form a world-class transportation hub at an early date.
(Finish)