China News Service, Ma'anshan, January 3 (Liu Wenting) On the evening of the 2nd, the south main tower of the Chao-Ma Railway Ma'anshan Highway Yangtze River Bridge, which was constructed by the China Communications Second Navigation Bureau, successfully completed the concrete pouring of the caps.
As the world's first kilometer-class three-tower dual-purpose cable-stayed bridge, the bridge's three main towers are designed to be more than 300 meters high, and the two main spans are 2,240 meters long. The tower height and span are the highest in the design of the same type of bridge.
The foundation construction of a 300-meter-high tower and a kilometer-level main span is particularly important, and the cap is the most important as a key conversion process for the construction of the superstructure.
The Z5 main tower bearing platform formed this time is a dumbbell-shaped structure, covering an area of more than 3,000 square meters, equivalent to the size of 7 basketball courts.
The cap is 9.5 meters thick and is poured in three layers.
The final layer to be constructed is 3.1 meters thick, and the pouring volume is about 8,000 cubic meters.
The concrete pouring of the cap of the south main tower of the Ma'anshan Gongtie Yangtze River Bridge on Chaoma Railway was successfully completed.
Photo by Liu Wenting
Mass concrete pouring has always been a difficult point in the construction of the platform, and the temperature control of the concrete inner and surface is a huge challenge.
Chen Yueyun, the leader of the main pier shelf, said: "During this period, the lowest temperature is only 2 degrees. To avoid excessive temperature difference causing structural cracks in the concrete, we use automated and intelligent means, like installing a'central air conditioning' in the concrete of the cap. Based on the addition of internal cooling circulating water, measures such as optimizing the mix ratio, controlling the mold temperature, installing heaters, installing insulation cotton, etc., form a mechanism of'internal dispersion and external protection', and at the same time introduce a cloud temperature control system and deploy wireless sensors , Automatic flow valve, real-time monitoring, early warning and control." "Since the first layer of concrete was poured on the platform on November 16, all staff have been working hard for 47 days, and the operators have been working in two shifts 24 hours a day, with a variety of large-scale Equipment, and finally the pouring of the south main tower cap was successfully completed.” Qu Hongchun, the person in charge of the Chao-Ma Railway 2nd bid project of the China Communications Second Navigation Bureau, added.
The Chaoma Intercity Railway is an important part of the Hefei-Shanghai section of the Shanghai-Hanrong Railway, one of the "eight vertical and eight horizontal" main passages of the national railway network. It is of great significance to promote the deep integration of Maanshan City into the two metropolitan areas of Nanjing and Hefei, and to promote the integration of the Yangtze River Delta and the higher-quality development of the Yangtze River Economic Belt.