China News Service, Guangzhou, January 8 (Cai Minjie Liu Yang) After 150 days of fully closed construction, the bridge deck part of the large and medium repair project of Guangzhou Hedong Bridge was successfully completed, and the bridge deck will be officially resumed at 0:00 on January 10th. Twenty days earlier than the construction schedule, this move has restored and strengthened the two major urban traffic “arteries” of Haizhu and Liwan, promoted the improvement of urban traffic quality, and helped the old city rejuvenate.
The Hedong Bridge is located on the rear channel of the Pearl River between Haizhu District and Liwan District in Guangzhou. It consists of a main bridge and an east-west approach bridge. The main line is 2013 meters long (the main bridge is 648 meters long). It is a composite cable-stayed double tower and double cable plane. bridge.
When the bridge was completed in 1998, it was the largest bridge of the same type (I-beam composite beam) in China and the bridge with the largest span in Guangzhou urban area.
As a major traffic road connecting the two main urban areas of Guangzhou, Haizhu and Liwan, with a two-way average daily traffic volume of nearly 130,000 vehicles, it is an important traffic channel for cross-river traffic in Guangzhou, and is closely related to the production and life of residents on both sides of the strait.
Guangzhou Hedong Bridge major and medium repair project completed Photo by Chen Jimin
According to the reporter's understanding, the Hedong Bridge was completed and opened to traffic in 1998, and years of overload operation caused certain damage to the bridge structure.
According to Jiang Weizhong, the engineering director of the Hedong Bridge major and medium repair project of Guangzhou Communications Investment Group Co., Ltd., the construction scope of the Hedong Bridge major and medium repair project involves the replacement of the whole bridge stay cables, the reinforcement of piers and columns, the removal of the old bridge deck and the new bridge. Surface paving and other special projects.
Compared with the previous cable replacement projects, due to the asymmetry of the main span flexible and the side span rigid, the bridge deck will be deformed greatly during the cable replacement period, and there is a greater structural safety risk.
Jiang Weizhong said that in the absence of precedents for reference, the project pioneered the rapid cable replacement technology for hybrid beam cable-stayed bridges, creatively adopted the single-tower symmetric double-tower anti-symmetric cable replacement technology, and adopted the step-by-step cable control technology for the first time. Through technological innovation and optimization of the process, the cable replacement period was shortened from the original plan of 144 days to 83 days.
In addition, the project also used the intelligent manned cable maintenance vehicle to maintain the stay cables for the first time.
This maintenance vehicle can realize two ways of walking by fiber rope traction and hydraulic drive. It has the functions of double safety protection, anti-falling self-locking, wind resistance and self-stabilization, and real-time intelligent monitoring. It is a new type of intelligent cable detection and maintenance. platform.
Jiang Weizhong said that through the application of new technologies, new processes, new materials and new equipment "four new" technologies, the project will eliminate structural diseases of the bridge and ensure that the bridge continues to serve safely.
Today's Hedong Bridge has been put on a stronger "armor" and will continue to fulfill the responsibility and mission of the city's "big artery" and serve the economic and social development of southwestern Guangzhou.
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