Zhongjiang Assembly: The participating project won the "China Steel Structure Gold Medal"

   Recently, China Construction Metal Structure Association announced the 15th“China Steel Structure Gold Award”(The second batch) The winners of the project won the award for the construction project of Nanjing Lvdu Avenue crossing Qinhuai New River Bridge, which was built by Zhongjiang ShengXiang Heavy Industry, affiliated to Zhongjiang Assembly Company.

   The construction project of Lvdu Avenue is located in Dongshan Street, Jiangning District, Nanjing City. It crosses Binhe Road, Qinhuai Xinhe, Qinhuai Road South to the intersection of Dongcun Road and Tonghuai Street in the form of a bridge, with a total length of about 1.26 kilometers. It is mainly responsible for the traffic connection between Nanjing South Railway Station in Jiangning District and Baijiahu Central Area, and is an important part of the collection and distribution system of Nanjing South Railway Station. The project spans the main bridge of Qinhuai Xinhe River, with a span combination of 317m, and the structure is a steel-concrete composite beam; the steel main beam adopts a separate steel box structure, and the left and right steel boxes are connected by concrete bridge decks and steel diaphragms. The steel girder of the whole bridge is divided into 56 sections, with a total steel consumption of about 8000 tons. It is currently the largest height difference sliding method construction bridge in China, the largest single-span steel-mixed composite continuous beam bridge, and the second CA-RPC coarse aggregate reactive powder concrete application bridge in China.

   After Zhongjiang Shengliang Heavy Industry undertook the project, the technical team prepared the special construction plan for the steel structure of the project according to the actual conditions on site, formulated the construction arrangement according to the requirements of the project construction period, established and improved the organizational structure and responsibilities, established the project management objectives, improved the construction process, prepared the construction schedule, tracked the construction progress, and optimized the beam section transportation plan. The special construction of the project was unanimously praised by the project evaluation expert group.

   This project adopts the method of pre-assembling and transporting to the installation site by the processing plant, and the first batch of secondary steel plates entered the plant on October 22, 2021 to start processing.“Side-span sectional pushing sliding cumulative assembly, cross-river closing lifting method”To realize the construction of large-span variable cross-section steel-mixed composite beams. Through the separation of the sliding shoe bracket, the linear adjustment of the longitudinal height difference beam segment is realized, the stepped bracket system is used to improve the stability of the installation of the large height difference beam segment, and the different curing methods of coarse aggregate reactive powder concrete are studied in the process, and the reasonable curing method is selected to save the project duration. At the same time, in view of the characteristics of novel bridge structure, large span, high precision requirements and complex system conversion, BIM digital technology combined with real-time monitoring safety system is used to realize the data collection and comparative control of the whole process of bridge construction, obtain the real-time state of the structure, and ensure the construction safety. Due to the large volume of the beam section and the maximum transportation weight of a single beam section exceeding 300 tons, in order to solve the transportation problem of the beam section, the project adopts the shipping mode, and the company coordinates the dock wharf of Jiangsu Rongsheng Heavy Industry Co., Ltd., 900 tons gantry crane and other equipment and facilities to ensure the smooth shipment of the beam section according to the daily tidal time.

   Through unremitting efforts, the project successfully completed the erection of the main bridge in May and September 2022, and completed the demolition of the temporary support on May 15, achieving the scheduled goal of completing the construction in the flood season at the end of May. The project has won the Nanjing Municipal Transportation Bureau”Quality Engineering Creation Demonstration Project“1 Gold Award in Hong Kong International BIM Competition, China Construction Metal Structure Association“Gold Association Cup”BIM Grand Prize and other honors.