China News Service, Foshan, July 1 (Cai Minjie, Wei Panfeng, Yang Ning) China Railway Bridge Bureau announced on July 1 that the main channel bridge of the Longxiang Bridge Project of the Greater Bay Area Project has been fully connected, and it is planned to complete the entire bridge by the end of this year.

After the project is completed and opened to traffic, it will further improve the regional transportation structure in Foshan, improve the transportation capacity of the river crossing channel, and promote the social and economic integration of the Guangdong-Hong Kong-Macao Greater Bay Area.

  The city of Foshan in the Greater Bay Area is located in the hinterland of the Pearl River Delta, and the development of comprehensive transportation has ushered in a major opportunity.

In order to accelerate the co-urbanization of Guangzhou and Foshan, Foshan focuses on improving the urban hub system, and promoting the balanced layout and interconnection of road and rail facilities.

  Longxiang Bridge is a control project in the Longxiang Bridge and Approach Project. The total length of the bridge is 1549.04 meters, and the main span is (118+2×202+93) meters of steel-concrete mixed continuous beams.

Photo courtesy of China Railway Bridge Bureau

  About 2,500 meters upstream of the Longxiang Bridge in Foshan City is Xiqiao Bridge, and about 2,500 meters downstream is Beijiang Bridge. Due to the limited height of the upstream and downstream waterways, large floating cranes cannot be accessed in the waterway construction area, and it is difficult to use water hoisting methods. Installation of steel beams in the mid-span joint section.

At the same time, the main girder of the bridge is made of steel-concrete hybrid girder, which has complicated connection of construction procedures, frequent structural system transformation, difficult control of the construction quality of the steel-concrete joint section, difficulty in the control of the bridge alignment, and long-span steel girder in the middle of the long-span construction. Risk high technical issues.

  To this end, the builders of the China Railway Bridge Bureau promoted the innovation of "bridge + technology", carried out research on the construction of a complete set of technologies for the construction of large-span double-span rigid frame-continuous beam combination system steel-concrete hybrid beams, and developed a new multi-functional lifting system to achieve The integrated construction of concrete suspension pouring, steel-concrete combined section installation, and overall lifting of large-section and large-tonnage steel beams.

  This includes the use of multi-main-span hybrid beam construction method, which solves the problems of steel beam close-out matching and eccentric loading of middle piers under the action of unbalanced loads, realizes precise control of linearity, and ensures structural safety; successfully lifts 75 meters The steel box girder has created a precedent for the overall lifting and closing of large-section steel girder in tidal inland rivers and densely navigable areas without the participation of large-scale floating cranes, laying the foundation for the subsequent widespread application of international leading technologies.

  "The fourth 75-meter steel box girder lifting construction is the most critical construction node in the entire project cycle, and it is also the most complex and difficult process in the entire project construction technology." According to project manager Guo Zhanping, in order to ensure that each lifting work is carried out, The project department has organized expert review meetings for many times to study the difficulties and key technologies in the lifting process. According to the first piece, continuously optimize the lifting technical plan and deduce the lifting process to ensure the installation accuracy of the steel box girder.

Up to now, all 75-meter steel box girder lifting tasks have been completed.

  According to reports, the Longxiang Bridge and the approach road project are connected to Gaoming District, Foshan City in the west and Xiqiao Town, Nanhai District in the north. An important project to promote the construction of the Guangdong-Hong Kong-Macao Greater Bay Area as a priority for transportation.

After the project is completed, the travel time from Chancheng to Nanhai will be shortened, which will bring positive significance to the economic development of Foshan and surrounding areas.