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世界最长猫道拆除 燕矶长江大桥冲刺年底通车,世界最长猫道拆除 燕矶长江大桥冲刺年底通车_我的网站

一 |     　　武汉8月24日电(葛利龙 余哲)随着最后一根猫道承重索精准下放至桥面，由湖北交投投资、中交二航局承建的湖北燕矶长江大桥猫道拆除工程23日全部完成，标志着这座世界最大跨径四主缆悬索桥全面进入上部结构施工收尾阶段，正全力冲刺年底建成通车目标。    CABO SAN LUCAS, Mexico -- Residents of Mexico’s Los Cabos resorts rushed to prepare as Hurricane Norma headed toward the southern tip of Mexico’s Baja California Peninsula for an expected landfall Saturday, while in the Atlantic, Tammy grew into a hurricane and threatened to batter the islands of the Lesser Antilles. Businesses in Cabo San Lucas nailed up sheets of plywood over their windows and government personnel hung up banners warning people not to try to cross gullies and stream beds, after Hurricane Norma regained strength and once again became a major storm Friday.Baja California Sur Gov. Victor Manuel Castro urged people to stay at home.“Nobody should leave their house after six, seven in the evening," Castro said. "Nobody should go out.”In the Atlantic, the U.S. National Hurricane Center said Hurricane Tammy had winds of 80 mph (130 kph), and hurricane warnings were issued for the islands of Guadeloupe, Antigua, Barbuda, Montserrat, and St. Kitts and Nevis.The center said Norma had 120 mph (195 kph) maximum sustained winds and was centered about 145 miles (235 kilometers) south of Cabo San Lucas. The Category 3 storm was moving north-northwest at 9 mph (15 kph), and the center said its outer bands of rain were already reaching the Baja peninsula.Hotels in Los Cabos, which are largely frequented by foreign tourists, remained about three-quarters full and there was no major move by visitors to leave, Baja California Sur state tourism secretary Maribel Collins said.With rain already falling in Los Cabos, some flights in and out were canceled Friday, there was no way out anyway. Airports will be closed Saturday, according to the local civil defense office.The local hotel association estimated there were about 40,000 tourists still in Cabo San Lucas and San Jose del Cabo on Friday.A couple from San Diego walked through the largely deserted streets of Cabo San Lucas on Friday. Because their sports fishing tournament had been postponed until next week, they had little choice but to stay. The local port was closed to navigation as a precaution. At the marina in Cabo San Lucas, José Ceseña was hauling out of the water the boat he usually uses to ferry tourists around on tours. With the port closed and a hurricane coming, he said it wasn’t worth risking his craft.Homero Blanco, the state commander of the National Guard, said beaches at the resort had been ordered closed and Guard troops were sent to clear people from the seashore.“This morning there were a few people on the beach when we cleared it,” Blanco said. “We invited them to leave.” The federal government posted 500 marines to the resort to help with storm preparations, and municipal officials said as many as 39 emergency shelters could be opened if needed.A hurricane warning was issued for the southern tip of the Baja California Peninsula, and the forecast track would take a weakened Norma toward the mainland of Mexico’s western Pacific coast as a tropical storm.Norma was expected to weaken somewhat as it neared land, but not as much as originally forecast. In the Atlantic, Hurricane Tammy was about 55 miles (85 kilometers) east of Martinique and 135 miles (220 kilometers) southeast of the Caribbean island of Guadeloupe and was moving west-northwest at 9 mph (15 kph).Tammy was expected to remain at hurricane strength and even strengthen slightly as it moved toward the Lesser Antilles through Saturday passing by Guadeloupe, Antigua and Barbuda. Both Martinique and Guadeloupe are French overseas departments.The hurricane center said in a report that “heavy rainfall and flooding (are) likely over much of the Lesser Antilles.”Hurricane warnings were issued for the islands of Guadeloupe, Antigua, Barbuda, Montserrat, and St. Kitts, Nevis, Anguilla, St. Maarten, St. Martin and St. Barthelemy.___Follow AP’s climate coverage at: https://apnews.com/hub/climate-and-environment。图为猫道全部拆除完成的燕矶长江大桥。

二 | 　(无人机照片) 葛利龙 摄　　燕矶长江大桥横跨鄂州与黄冈两地，采用一跨过江设计，主跨达1860米，项目全长约26公里。上层为六车道高速公路，设计时速100公里；下层为四车道城市快速路，设计时速80公里。

三 | 作为串接鄂州和黄冈沿江发展轴、对接湖北国际物流核心枢纽机场的重大交通工程，大桥建成后将打通沿线交通瓶颈，强化两市经济联系，极大完善区域“公、铁、水、空”综合交通运输体系。

四 | 　　猫道是悬索桥施工中不可或缺的临时高空作业通道，平行布设于主缆下方，主缆索股牵引、紧缆压实、索夹与吊索安装、主缆防腐涂装等全部关键工序均依托猫道展开。

五 | 燕矶长江大桥采用独特的四主缆设计，内外主缆下方各设一条猫道，将南北两岸主塔相连。单条猫道宽3.45米，长约3公里，四条猫道总长达12公里，是目前世界上最长的猫道。

六 | 图为猫道全部拆除完成的燕矶长江大桥。　(无人机照片) 葛利龙 摄　　此次拆除面临极高风险与巨大挑战。大桥横跨长江主航道，猫道承重索采用直径60毫米高强度钢丝绳，抗拉强度达2160兆帕，为国内之最，拆除安全风险高、施工难度大。而外缆猫道拆除更是难上加难，受双层钢桁梁结构限制，猫道挤在钢梁外侧与上层桥面下方，作业空间局促犹如“高空夹缝”。施工团队需先将猫道承重索整体向上提举、翻越外主缆后再平稳下放，对姿态控制精度要求极高。　　为此，中交二航局项目建设团队为猫道量身定制了“翻缆方案”。

七 | 通过增设辅助导向轮对索体进行限位导向，实时监测两侧高差变化，动态调整提吊参数，有效避免承重索在翻越过程中发生扭转或滑移，防止与主体结构发生磕碰损伤。针对绳索直径大、自身索力高等难题，团队优化卷扬机配置，设计多级滑轮组牵引系统，成功化解大直径钢丝绳平稳下放的技术瓶颈。

八 | 图为猫道全部拆除完成的燕矶长江大桥桥面。　(无人机照片) 葛利龙 摄　　随着猫道全部拆除完成，燕矶长江大桥施工进入最后冲刺阶段。下一步，建设团队将有序推进桥塔涂装等附属工程施工、荷载试验及交工验收等工作，全力冲刺年底建成通车。

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