On June 7, it was learned from China Railway Bridge Bureau that on June 6, the G3 Tongling Yangtze River Railway Bridge, designed by China Railway Bridge Institute and constructed by China Railway Bridge Bureau, successfully completed the "ultimate physical examination" - bridge dynamic and static load test. A total of 214 heavy-duty trucks with a total weight of about 9,000 tonnes were put onto the bridge in batches to simulate future traffic loads and conduct a comprehensive test of the bridge.

A total of 214 loading vehicles were arranged for the bridge load test, with a maximum loading capacity of more than 9,000 tons, and about 700 sets (sets) of professional test equipment were invested to complete the static load and dynamic load double test, and the main beam, main tower, cable-stayed cable, sling and other comprehensive inspections were carried out. The static load test covers 19,000 measurement point nodes and more than 31,000 structural units, and scientifically evaluates the actual bearing performance of the bridge through the load efficiency verification of 17 typical working conditions at 9 loading stations. In the dynamic load test, 39 groups of dynamic characteristic monitoring points and 18 groups of dynamic response monitoring points are arranged to accurately collect key parameters such as beam vibration amplitude, acceleration, dynamic deflection, dynamic stress and dynamic displacement of the support.

As the world's first double-deck cable-stayed cable-suspension cooperation system bridge, the G3 Tongling Yangtze River Highway and Railway Bridge integrates the three functions of "expressway, intercity railway, and freight railway" to cross the river. The total length of the bridge route is 11.88 kilometers, which is composed of three parts: the road-railway joint section (including the main bridge across the river), the north bank highway approach bridge and wiring, and the south bank highway approach bridge and wiring. The main span of the bridge is 988 meters, and the upper deck is arranged as a 6-lane highway with a design speed of 100 kilometers per hour; The lower bridge deck is arranged as a 4-line railway, of which 2 lines are Hechi intercity railways with a design speed of 250 kilometers per hour, and 2 lines are Tongling South to Jiangbei Port Railway, which is extended to Zongyang in the later stage and connects Anqing with a design speed of 120 kilometers per hour.

The load test is the "ultimate physical examination" to verify the bearing capacity and safety of the bridge before it is opened to traffic, which is divided into static load test and dynamic load test, by applying the equivalent load of simulated traffic on the bridge deck, the engineer measures the displacement and strain data of the key parts of the bridge (such as steel beams, main towers, main cables, slings, etc.) in real time, and compares and analyzes them with the theoretical design values, so as to scientifically evaluate whether the actual working performance of the bridge meets the design and specification requirements.

The G3 Tongling Yangtze River Highway and Railway Bridge route is 11.877 kilometers long, integrating three river crossing functions: "expressway, intercity railway, and freight railway". The main span of the bridge is 988 meters, and the upper level is a 6-lane highway with a design speed of 100 kilometers per hour; The lower level is equipped with 4 lines of railway, including two lines of passenger railway and two lines of freight railway.

At present, the G3 Tongling Yangtze River Railway Bridge electromechanical, traffic safety facilities, pavement paving, housing construction and other follow-up projects are in full swing to ensure that the conditions for opening to traffic in July will be completed and opened to traffic will significantly improve the national and Anhui provincial highway network, greatly enhance the regional cross-river channel traffic capacity, as a transportation hub connecting the Anhui River and connecting the east and west, to strengthen the Yangtze River Delta region and Sichuan, Chongqing, Hubei and Jiangxi and other central and western provinces, promote the development of regional transportation integration, and optimize the layout of the Yangtze River cross-river channel. It has far-reaching strategic significance and an important driving role.(This article is from the official website of Seetao www.seetao.com. Reprinting without permission is strictly prohibited. Please indicate Seetao.com + original link when reprinting) Seetao.com Strategy Column Editor/Sun Fengjuan