On May 18, the main tower on the north bank (Huanggang side) of Yanji Yangtze River Bridge, which was constructed by China Railway Bridge Bureau invested by Hubei Trading and Investment Company, completed the first hoisting of steel bar parts, achieved precise docking, and fully opened the construction acceleration of the main tower.
Yanji Yangtze River Bridge
Yanji Yangtze River Bridge, with a main span of 1860 meters, is the world's first suspension bridge with four main cables of different sag. The north main tower is 195 meters high and is divided into 35 sections for pouring. From the fourth section of the tower column, the "aerial factory" construction is formed with the help of the super climbing formwork system. From the eighth section, the hoisting process of steel bar components is carried out. At present, the builders of China Railway Bridge Bureau are making every effort to promote the construction of the main tower, which is growing rapidly at the speed of 9 days. For the first time in Hubei Province, the integral hoisting technology of the main tower reinforcement parts is adopted for the
Tower
Yanji Yangtze River Bridge. The hoisting reinforcement parts are the eighth section of the north main tower, which is octagonal outside and circular inside. The total weight of the reinforcement skeleton, lifting tools and slings is about 115 tons. Firstly, the semi-finished products shall be processed in the reinforcement processing workshop and transported to the reinforcement storage area of the main pier site. The semi-finished products shall be lifted to the binding jig frame platform by truck crane and assembled into reinforcement parts. Then the whole shall be lifted to the designated position of the tower column, and the taper sleeve shall be used to lock the reinforcement joint for connection and installation.
In order to realize the rebar of tower column, the builders of China Railway Bridge Bureau have taken many measures simultaneously from the in-situ loose binding to the hoisting alignment of rebar components.
• High-precision CNC cutting equipment is used to cut the semi-finished steel bars, the uniformity of the length of the sectional steel bars is strictly controlled, and the special new tooling is designed according to the distribution and change law of the tower column steel bars.
• The upper and lower double-layer positioning system is adopted for the steel bar binding jig, which is adjustable and can adapt to the distribution change law of steel bars in each section, so as to realize the precise positioning of each steel bar;
• A new type of lifting appliance is designed and manufactured. The lifting point of the lifting appliance can adjust and adapt to the change of the section and the center of gravity of the steel bar, so as to ensure the stable and safe posture of the large-tonnage whole section of steel bar after lifting.
• In order to make the top opening of the vertical reinforcement of the seventh section (in-situ loose binding section) of the tower column flush and realize the lifting and docking, the project department uses laser level to measure and inspect the top surface of the seventh section of the reinforcement, and cuts the local uneven parts to ensure that the relative height difference of the top surface of the reinforcement is not more than 5 mm.
Why is it necessary to adopt the construction technology of steel bar components?
According to Jiang Benjun, Deputy Engineer of China Railway Bridge Bureau and Chief Engineer of Yanji Yangtze River Bridge, the steel skeleton binding of bridge towers usually adopts high-altitude loose binding technology with high risk and low efficiency. On the one hand, it reduces the number of high-altitude workers, reduces the risk of operation safety, ensures the safety of the project, and at the same time, it embodies the people-oriented construction concept. On the other hand, the traditional manual high-altitude loose binding of steel bars has a harsh working environment and difficult quality control, so the component construction is more conducive to improving the quality of engineering construction. At the same time, the operation is more efficient, and the workload of 2-3 days for high-altitude steel bar binding can be shortened to more than ten hours at present.
It is understood that the relevant departments of the state are promoting the development of prefabrication, factory and standardization in the field of engineering construction, and the technology of steel bar parts is an important measure to respond to the above concepts, which represents the future development direction of the field of engineering construction.
The project links
the Ehuang Second River-crossing Channel (Yanji Yangtze River Bridge and Connection) with a total length of about 26.4 kilometers, which is a comprehensive supporting project for Hubei Province to build the fourth international logistics hub (Huahu Airport) in the world and the first in Asia. It is of great significance to construct a comprehensive transportation system of waterway and air transport in eastern Hubei and to promote the high-quality development of the integration of Wuhan, Hubei, Yellow River and Yellow River.
浙公网安备33010802003254号