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China's longest offshore steel trestle bridge completed in Dalian_我的网站

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一 | (ECNS) -- An 11.6-kilometer offshore steel trestle bridge, the longest of its kind currently under construction in China, was fully connected on Tuesday in Dalian, located in China's northeastern Liaoning Province. The steel trestle bridge is a key supporting facility for the Dalian Changhai Bridge project. Changhai County, China's only island border county, has long relied on maritime transport. However, ferry services are suspended for more than 60 days each year due to tides, strong winds and heavy fog, while round-the-clock navigation is unavailable even when services are operating. These limitations have restricted residents' mobility and hindered local economic development. The Changhai Bridge project stretches 25.5 kilometers across the Lichangshan Strait, linking Dachangshan Island in Changhai County with the mainland at Pikou Port in Pulandian District. Once completed, the bridge is expected to end the county's long-standing dependence on maritime transport. Construction in the Yellow Sea has posed significant challenges due to frequent changes in wind, waves and tides, as well as shallow waters that prevent conventional construction vessels from operating. To overcome these difficulties, the project team built the steel trestle bridge as a key support facility. Serving as the main transport route for construction materials, heavy machinery and personnel, it acts as a "lifeline" for offshore construction, according to the project team. Ni Jiaming, project manager for the third section of the Changhai Bridge project under China State Construction Engineering Corporation (CSCEC), said the steel trestle bridge required 3,431 piles and 67,000 metric tons of steel. Construction was completed in 423 days, 10 days ahead of schedule. Gong Baokai, deputy chief commander of the Dalian Changhai Bridge project under China State Construction Eighth Engineering Division, said completion of the trestle bridge has helped overcome construction difficulties in shallow waters, significantly improving the efficiency of transporting materials and personnel while reducing offshore construction risks. Its connection also marks the southern section of the Changhai Bridge project entering the main foundation construction phase. The Changhai Bridge is expected to open to traffic in 2029. (By Tang Yuxian) 。

[ 资讯] 日前，小米汽车官方就“在赛道测试小米YU7(参数|询价)时刹车片起火”做出回应。小米汽车官方表示，在赛道驾驶车辆往往需要频繁在超高速行驶中紧急制动，制动盘温度会急剧上升，若未采取有效散热，将引发材料起火。这属于一种正常的物理现象，但制动性能不会失效。

以下是官方回复：小米YU7 Max在天津V1赛车场进行1个暖胎圈+1个飞行圈后，在未进行散热圈的极端情况下，直接驻车，高温导致制动片有机物材料发生起火，但制动系统整体未出现任何制动失效等问题，功能健全，使用正常。

此外，测试车辆未使用小米YU7 Max大师模式中的“能量回收增强”功能。该功能会增强赛道工况下的能量回收强度，降低机械制动系统的负荷，即便出现ABS抱死情况，依然可以提供最大0.2G的制动能量回收，有效减少制动系统温度超过600℃的极端情况发生。在赛道驾驶时，车辆往往需要频繁在超高速行驶中紧急制动，此时制动系统承受的负荷将远高于日常驾驶。

二 | 在这种工况下，制动盘温度会急剧上升，若未采取有效散热，将引发材料起火。同时，小米YU7作为中大型SUV，相比尺寸更小的SUV车重更高，同时高动力带来的赛道尾速更快，制动系统在猛烈制动过程中产热也会更加明显。因此，有效散热是非常关键且基本的赛道驾驶常识。

三 | 小米YU7 Max采用低金属制动片，材料包含金属纤维、磨料、树脂等有机物。树脂及其他有机物在高温下(一般大于300°C)产生聚合物支链裂解反应产生部分气体，如水分、一氧化碳、二氧化碳、烷基、芳香族气体等，其中部分可燃气体在高温（一般制动盘温度＞600?C）及氧气充足的环境下可能会产生短暂明火现象。