Skip to main content

An expert group of engineers, including Cornell Engineering Dean Lance Collins and Professor Tom O'Rourke, tour the Canarsie Tunnel. A benchwall lines the tunnel on the right.

男女做爱视频免费

While speaking at an event in early December, Lance Collins, the Joseph Silbert Dean of Engineering, noticed his phone receiving an unusual number of messages. He continued his speech, not knowing until later that he was being contacted on behalf of New York Gov. Andrew Cuomo for a special project.

The governor wanted to ask Collins some questions regarding New York City’s Canarsie Tunnel, a vital underwater subway path connecting Manhattan to Brooklyn. Flooding from Superstorm Sandy in 2012 had badly damaged the century-old tunnel, which was set to close for 15 months of repairs beginning in April. The shutdown of the tunnel’s L train service was so dreaded by commuters in New York that some had dubbed it “L-pocalypse.”

Professor Tom O'Rourke, left, speaks with N.Y. Gov. Andrew Cuomo during a tour of the Canarsie Tunnel on Dec. 14.

But thanks to Ivy League ingenuity – and engineering – there’s a good chance “L-pocalypse” won’t befall the Big Apple. What began with a few questions resulted in an entirely new plan to avert the shutdown, and perhaps a new model for how major infrastructure projects can be evaluated.

Assessing the problem

Collins and Cuomo were joined on a conference call by a number of officials and engineers, including Tom O’Rourke, the Thomas R. Briggs professor of civil and environment engineering with expertise in underground infrastructure and transportation systems.

“Cuomo said he wanted a fresh set of eyes to look at the tunnel plan. He wanted us to see if we thought it was the best way forward or if we had any alternative ideas that might help keep the tunnel operational,” said Collins.

高清视频麻豆

The group discussed the work that needed to be done to the tunnel, parts of which were beginning to erode from the salt water that had flooded it six years earlier. Its concrete benchwall – a 2-foot-wide walkway stretching the length of the tunnel – was deteriorating in some areas, endangering the track and exposing the power and signal cables encased within.

Soon after the call, Collins and O’Rourke received a detailed analysis of the tunnel and its proposed rehabilitation plan. After an in-depth review of the report, they were asked to join a midnight tour of the tunnel with Cuomo and engineering professors from Columbia University, including Mary Boyce, the dean of the Fu Foundation School of Engineering and Applied Science.

With flashlights, hardhats and other protective gear, the team descended into the tunnel during the early morning hours of Dec. 14. They observed that while some areas of the benchwall remained intact, others had begun to crumble. In other areas, the benchwall had acted as a sponge, absorbing salt water that, in turn, was corroding the cables inside.

Collins described the tour as informative and an exhilarating experience for the engineering team. He added that Cuomo was equally engaged.

“I was amazed by the command the governor had of the details regarding the tunnel,” said Collins. “If you think about everything it takes to run a state government, you wouldn’t think he could have this level of understanding. It was impressive.”

The team emerged later that night, galvanized and ready to dig deeper.

In 2012, Hurricane Sandy filled the Canarsie Tunnel with salt water, from the Avenue D Fan Plant to the North 7th Street Fan Plant.

Proposing a new solution

The Cornell and Columbia engineers began examining different rehabilitation options. They worked collaboratively through winter break, mostly in New York City so they could exchange ideas and begin to piece together an alternative proposal to the existing rehabilitation plan. They toured the Hudson River Tunnel, consulted extensively with officials from the Metropolitan Transportation Authority (MTA) and Amtrak, peppered consultants with questions, and studied state-of-the-art rail tunnels in other big cities, including Hong Kong, London and Riyadh.

The end result: a proposal to renovate the Canarsie Tunnel while keeping it operational, safe, on time and on budget. Night and weekend closures would be required, but only one of the tunnel’s two tracks would close at a time, allowing for continuous service.

“This is really a unique design, a unique system,” Cuomo said as he announced the new proposal during a Jan. 3 press conference. “It’s faster, it’s cheaper, it’s better than the way we’ve been doing it now.”

“Technology is typically advanced through the integration of existing innovations as opposed to the invention of something completely new from whole cloth.”

Lance Collins, the Joseph Silbert Dean of Engineering at Cornell

Instead of replacing miles of cables inside the benchwall, as the original plan had proposed, a racking system would suspend new cables on the side of the tunnel. This would allow the existing cables to continue powering the train while new cables are installed and jacketed in fireproof material. And instead of laboriously replacing 32,000 feet of benchwall, the plan proposes the wall remain where structurally stable and be fortified with fiber-reinforced polymer wrap where needed.

The racking system has been used in the construction of modern subway tunnels and the fireproof material is used in the airline industry, but neither has been applied to a rehabilitation project of this kind, according to Collins, who said the fiber-reinforced polymer wrap is also a proven technology borrowed from other infrastructure projects.

“It’s used today to hold together pillars of bridges that were damaged in earthquakes,” Collins said. “That is a far more structurally challenging environment than a benchwall. We’re simply using it for a very different application.”

To monitor the Canarsie Tunnel’s interior, “smart” fiber-optic sensor cables would run along the remaining benchwall to detect small shifts or cracks. Like the other technologies, it has proven effective in projects outside of the U.S., and has even been tested in O’Rourke’s Cornell laboratory.

O’Rourke said data gained from the fiber-optic cables would allow engineers to learn more about the Canarsie Tunnel’s condition than previously possible.

“The fiber optics and other proposed sensors allow us to create a ‘smart’ tunnel that can detect very small levels of deformation and changes in structural integrity before there is serious loss of capacity in the system,” said O’Rourke, who added the plan also calls for a complementary high-resolution LiDAR system – a laser detection technology – to periodically map the surface of the tunnel and monitor it for deterioration.

An opportunity to lead the country

Collins said he is genuinely impressed with the original rehabilitation plan and emphasized that the new proposal could not have been conceived without the comprehensive work that had already been done. But he added that letting a group of outside experts re-examine the plan and “kick the tires” was an excellent idea that could be replicated in the future.

“I see this as a case study of how major infrastructure projects could be done,” said Collins, who noted that academia is a good place to find experts with knowledge of emerging technology and outside-the-box thinking.

An expert panel, including Columbia Engineering Dean Mary Boyce, left, and Cornell Engineering Dean Lance Collins, presents recommendations Jan. 3 for the Canarsie Tunnel rehabilitation project.

“Technology is typically advanced through the integration of existing innovations as opposed to the invention of something completely new from whole cloth,” said Collins, “and that’s what we were able to do, come up with a creative solution that weaves proven technologies into an integrated system.”

O’Rourke pointed out that rehabilitating the tunnel with smart sensor technology provides an enormous opportunity for New York agencies and engineering firms to partner with universities and assume a leadership role in developing intelligent infrastructure.

“This shifts the paradigm from current practice to construction empowered by distributed sensors and artificial intelligence,” O’Rourke said. “It can be an important step forward as the nation faces the challenge of addressing its aging infrastructure and bringing service and resources more effectively to the people, not only in New York, but across the United States.”

City officials hope renovations can begin sometime around April, as originally planned, but this time with the L train remaining in service.

Syl Kacapyr is public relations and content manager for the College of Engineering.

Watch highlights from the governor's Jan. 3 press conference.

涟源全干华服务有限公司

东川祥进新有限公司

江西省圣顺富设备有限公司

香蕉女郎在线观看 yellow高清在线观看 md2.pud 麻豆传媒在线 啊 啊下面好大污视频 琪琪热热see色20岁无码 爱情岛论谈网址大全 污软件免费 日本一区二区不卡免费乱码 向日葵视频app最新污下载 强奸电影 成事在人电影免费观看 亚洲欧美偷拍类另图在线播放 国产自产一区c久久播 av成人在线观看 富二代app成版人抖音免费 抽搐一进一出gif试视频 全程肉肉的共妻 9090xoxo在线观看 西元性自由免费XXX 女爆乳娇妻在线观看 国产91熟女人妻在线观看 青青青青久在线视频免费观看 高清视频麻豆 麻豆传媒映画剧情视频 小肉饼可以让我尝一下 开车120秒免费视频 人妻斩村上凉子 亚洲人成AV网站 暖爱视频大全 20709在线 人妻斩五十路在线播放 5g影院资讯在线年龄 秋葵视频男人的加油站二维码 汅动漫在线观看全集免费 一进一出抽搐免费观看gⅰf 蜜柚app下载网址 chinese青年大学生GAy 丁字裤美女 男生和女生那个对那个在线观看 app 向日葵视频app污视频在线观看免费 91live 微杏十年 樱桃视屏入口视频 四虎影视免费大全在线看 色yeye高清在线视频 薰衣草在线视频在线观看 一射到底 AV在线视频 男女做爱视频免费 抖阴网 国产在线视频免费观看 神马影院888 食色APP下载 5分钟听了会湿的声音 国产网红刘婷演绎视频 swag视频网站网在线 丝瓜视频免费 野外调教性奴456视频 宅女午夜福利免费视频 姐姐的朋友在线线观高清 老师你下面好紧小黄文 美女大便POOPING 爱你爱你直播在线观看 久青草 亚洲乱图区欧美 偷拍 日韩AV电影 小蜜桔破解版下载 国产精品视频在线 日本无码 马匹窝视频 猫咪软件 人成菠萝蜜免费视频观看 4tube4在线观看 国产剧情吴梦梦在线观看 香蕉app下载视频污 app 禁18怕啦啦啦视频 麻豆传媒映画最新入口网址 女人自慰一级看片 偷窥女厕国产在线视频 69在线看片免费视频 91chinese honemade video 小草观看免费播放 巴巴影院 汅动漫在线观看全集免费 中原镖局第三部全集56 皮猴5.0下载 年轻女教师6在线播放 小草观看免费高清 yy44880 亚洲人成AV网站 免费观看男女性高视频 无码专区6080yy电影 听了会湿的女喘声音 10_10_2828电影 千千影院 三上悠亚在线 污污高清完整视频菠萝蜜 四虎1515 swag里面的弯弯 试看120秒小视频动态图 s8视频app下载页加密路线 豆奶短视频下载2.2.3 成年免费观看性视频 幸福花园 柳州门 桑田实喂奶在线观看 妈妈的朋友9 最新2019视频免费观看 抖阴污下载 向日葵app最污在线观看 xrk77.向日葵视频app在线观看 烈火动漫动画为什么看不了 香草视频app官网免费 亚洲 综合 欧美在线 精品 欧美贵妇性派对俱乐部视频 秋葵app官方下载网址 2828在线影视网线观看 中文字幕白白布布永久视频 yy6090私人理论 暖暖视频免费视频播放 f2d2富二代官网下载 久播影院中文无码 菠萝菠视频app汅免费观看 茄子短视频app官网 lh8d直播app 金发美女大战黑大长吊 国产自产一区c久久播 男女做爱视频免费 亚洲а∨天堂2019无码 老人下面的几几 无敌电影免费观看 抖阴小视频 亚洲 日韩 国产 另类 污污app软件免费观看 app 秘密教学漫画免费 向日葵app最污在线观看 拔擦拔擦永久华人免费 草莓丝瓜app深夜释放自己 9090xoxo在线观看 向日葵视频app污视频在线观看免费 可乐视频在线播放手机 草莓视频app污下载 免费人成视频19674不收费 苍井空在线Av播放 深爱视频在线观看 欧美女优 阿甘正传免费观看完整版全视频 青青青青久在线视频免费观看 最新国产自产拍视频在线观看 水果视频app新版官网下载ios 水果视频app新版官网下载ios 鸭脖视频草莓视频向日葵视频黄瓜视频下载 色噜噜噜亚洲视频在线播放 人阁色第四影院在线 泷泽萝拉AV教师在线观看 荔枝APP下载 莉莉卡奥特曼 男女男免费精品视频网站 柳州莫菁第06集m3u8 3ATV 秋葵视频下载榴莲视频 日韩片 小草免费观看 视频 老人下面的几几 md2.pud 麻豆传媒在线 百媚下载 新67194免费入口 靠比较件下载免费 桑田实喂奶在线观看 麻豆剧情AV在线看 金鱼app在线直播 茄子在线 swag里面的弯弯 豆奶短视频破解版2020 52bh.xyz 妈妈的朋友在观看视频 日本免费一区 airshowzhengzhou.com 鬼逝绝叫痉挛地狱n0531 日本无码 聚盒子app 名优馆下载路径 日韩AV电影 水果app下载网站 秋葵视频男人的加油站 男女做污污的事情免费 芭乐app-草莓app黄下 小草在线视频高清 烈火动漫动画为什么看不了 交换温柔 欧美高清vjcossexo 芒果视频app污黄下载安装 黑粗大硬长爽 猛 d2天堂在线观看 国产剧情吴梦梦在线观看 s8视频网 8050网 免费男女性高爱潮视频粉网 欧美成年性色生活视频 9uu.coo下载 高清大众女浴池摄像头 蝶恋直播app 一级A片直播免费国语视频 www.hjslsd.com hjslsd.com www.gztiangua.com 日本人做真爱高清视频 5 三 X 5 · M 林海导航烈火动漫 添阴 午夜微博免费观看 台湾swag在线高清观看 高清全自动录播系统在线直播 swag台湾官网怎么进入 向日葵视频app下载安卓免费 在线播放中文字幕乱码 三人性交 蜜桔视频app免费下载安装 18种最常用的嘿嘿嘿姿势 抖阴污下载 淫荡视频 5g影院资讯在线年龄确认18 偷偷鲁 豆奶短视频破解版最新版破解 尤物网 韩国三级 国产喷水女同 thunder 小草视频在线观看播放视频 芭乐app-草莓app黄下 全程肉肉的共妻 红颜app 婬乱免费视频播放 歪歪漫画免费观看 依恋直播app下载污 东北老人做受视频国产 烈火动漫动画为什么看不了 让少妇爽到高潮视频 青青河边草免费观看 小草在线视频高清 抖阴App 草莓污app下载 日韩片 91香蕉app官网 水果视频app黄在线观看 免费91成版人抖音app官网 猛虎视频下载污版app 工口里番全彩无肉码3d 破女视频国语中文免费观看 全程肉肉的共妻 小草手机在线 食色短视频app成版人抖音免费下载无限看 不花钱裸交软件下载 水果视频下载免费安装视频 午夜微博免费观看 亚洲 春色 古典 小说 自拍 超pen个人视频2020 国产精品夜色视频 蝶恋花APP japonensis18 一19 欧美缚绳sm军妓调教视频 爱做网站图片 swag视频网站网在线 想他好多年1v1 男女做污污的事情免费 XX 日本XX免费完整网站 xy21app黄瓜下载 青娱乐视频 11K手机影院三级 圣诞小麋鹿在线 国产剧情吴梦梦在线观看 55爱网 西元性自由免费XXX 女人和男人高朝床叫视频 食色短视频app成版人抖音免费下载无限看 丝瓜app视频污版免费 男生和女生那个对那个在线观看 app 玉蒲团在线观看伦理 日本黄在免 日本撒尿大合集 在线 奇忧 柳州莫菁+12部全集视频大全 001ttt新网站 小草观看免费视频播放 7m分类凹凸精品大全 老师的诱惑 DIY101 烈火动漫动画为什么看不了 凤凰拍拍拍无挡视频免费1000 国产手机精品福利视频 尤物网 老湿机69福利区 四虎影院2019 小苹果app下载视频免费 七色影院 强奸电影 叼嗨视频 奇奇影院 亚洲AV国产AV资源 柠檬TV ww.5app最新网 爱情岛爱情亚洲品质 茄子短视频app最新版下载安装 恐怖000 樱桃视频官网在线观看 宜家16分3视频观看 456.ty 山西万荣9分45秒在线资源 火豆网 可以试看一分钟做受视频链 亚洲欧美日产综合网通 桔子直播app下载安装 美国特色一大片 年轻的嫂子 是羊大一点还是狗大一点 求个www男人都懂 蜜柚app下载网址 女性裸体撤尿高清视频 艺伎禁密史 国产自产一区c久久播 72966b,con樱桃直播app下载 微杏 橘梨纱AV在线观看 欧美女优 小象看片 丝瓜影院下载 风骚少妇 亚洲人成AV网站 麻豆国产第一集在线播放 2828在线影视网线观看 美女禁区 ta12app 向日葵污版app在线观看 香草视频免费下载无限看污app app 2020一二三四五地址 yh1.live樱花直播怎么进不去 中文 视频 video one 香草视频免费下载无限看污app app 小草视频免费观看视频 向日葵视频下载app视频免费 男女男免费精品视频网站 小草观看免费视频播放 富二代app官网国产污 恐怖000 秋葵下载app最新版免费 4438 最大成网免费 小象看片 依恋直播免费观看 工口里番全彩无肉码3d 荔枝APP下载 人人揉揉香蕉大免费 聚盒子app 色yeye高清在线视频 成人抖音版短视频app污 宝贝你的奶可真大给我吃 魔道香炉篇完整篇 漫画 3D肉蒲团 男女做污污的事情免费 茄子视频在线直播app在线 橘梨纱AV在线观看 秋葵视频安卓版下载网址大全 秋葵视频污最新版 暖暖暖视频大全免费高清 抽搐一进一出gif试视频 黄瓜直播 swag里面的弯弯 离婚与儿子做 午夜视频在线观看大全 蜜柚app下载网址 强奸电影 免费观看男女性高视频 微杏 china中国人自拍 男女男免费精品视频网站 色噜噜噜亚洲视频在线播放 虎头鹰视频 花姬直播在线观看 猛虎视频app下载免费污破 picacg网址是多少 桔子直播app下载安装 丝瓜在线观看视频免费下载 免费男女性高爱潮视频粉网 富二代app官网安卓免费下载 强奸新娘 香蕉女郎在线观看 蜜柚视频APP 欧美黑人肉体狂欢大派对 丝瓜视频下载APP 国产自产一区c久久播 火葡萄视频 琪琪热热see色20岁无码 05后早恋互摸热吻污污视频 无码专区6080yy电影 孕妇怀孕高潮潮喷视频 高清全自动录播系统在线直播 盘她s直播官方下载 app 火影忍者纲手 エロマンガ动漫 超pen个人视频97 菠萝视频是爱就要做出来app 亚洲乱图区欧美 偷拍 蜜柚3视频app直播下载 久久/这里只精品99re66 蝶恋直播app 爱做网站图片 最新午夜国内自拍视频 蜜柚污版app 偷偷鲁 那些污污的视频在线观看 香蕉伊思人视频 两个人的视频全免费直播 9uu有你有我足矣最多播放 橘梨纱AV在线观看 大奶牛app 国内kTv女厕所WC偷窥 苍井影院 小草视频免费观看视频 麻豆国产第一集在线播放 水果视频下载免费安装视频 古装性艳史电影在线观看 妈妈的朋友9 三上悠亚在线 向日葵视频下载app视频免费 草莓视频app污下载 xrk.77向日葵视频app下污 演示裸体瑜伽在线播放 向日葵成视频人app污片在线 鸭脖视频草莓视频向日葵视频黄瓜视频下载 初恋直播下载并安装 9悠悠免费 初恋app官方版下载 向日葵视频下载app免费观看 琳琅网站在线观看免费高清 麻豆在线视频 欧美前后双交 野外调教性奴456视频 桔子直播app下载安装 老司机福利ae精品视频 经典亚洲女厕所偷拍 a无限资源无限看 97免费人妻在线视频 向日葵视频下载app视频污版下载 youjizz.com 日本黄在免 亚洲AV国产AV资源 lh8d直播app 芭乐app-草莓app黄下 向日葵视频下载app视频污版iOS 靠比较件下载免费 成版人视频app破解版大全 2020一二三四五地址 小草观看免费高清 免费人成视频19674不收费 亚洲AV在线观看 高清无码爆乳潮喷在线观看 猫咪官方社区app 官网风险提示 求个www男人都懂 哈哈操 亚洲AV国产AV资源 蜜桔2视频app下载官网 韩国大尺完全无遮掩电影视频 抖阴App XX 日本XX免费完整网站 使劲操 九九热 8050网 强 电影大全 暖暖视频免费视频播放 初学生裸体视频在线观看 秋霞A级毛片在线观看 黄页网络站大全免费 高清视频麻豆 斗罗大陆小舞喷水视频 做暖暖的视频大全免费 欧美前后双交 性直播视频在线观看免费 114三级APP不卡 s8加密普通线路 貔貅直播app下载 富二代f2抖音app污版抖音app污 污的视频带痛的声音在线 爱情岛论谈网址大全 柠檬tv柠檬免费频道 草莓视频app污在线观看ios H网站 2020国拍自产初高中生免费 亚洲AV优女天堂 七色影院 98综合图区亚洲偷自拍 欧美高清vjcossexo 8x8x海外华人免费纹身 杏吧直播1314tⅴ 香草视频app官网免费 52bh.xyz 明星换脸自慰喷潮 中文字幕白白布布永久视频 四虎影视app ios 毛色毛片免费观看 丝瓜视频免费观看 爱情岛爱情亚洲品质 美逼 日本 二手网站 在线看隔壁放荡人妻藤浦 龙猫资源网 蚂蚁超碰在线 丝瓜视频免费 本色视频软件下载 百度网盘 国产精品视频在线