兰戈

A |     人民网北京4月19日电 （记者王仁宏）近日，经过136辆总重约5000吨的大货车组的重压测试，中交二航局参建的深中通道伶仃洋大桥完成动静载试验，这是世界首次在全离岸海中超大跨径悬索桥上完成的荷载试验。此前，深中通道中山大桥、非通航孔引桥已完成荷载试验。    CONCORD, N.H. -- The New Hampshire presidential primary filing period starts Wednesday, a ritual unruffled by either a changing of the guard or changes to the nominating calendar elsewhere.For the first time in more than four decades, candidates will file paperwork with a new secretary of state thanks to the retirement last year of longtime elections chief Bill Gardner. But his successor, David Scanlan, is carrying on the tradition of ensuring New Hampshire remains first, waiting for the dust to settle in other states before scheduling the 2024 contest.“I’m really in no hurry,” he said in an interview Tuesday.In contrast, the candidates themselves — particularly the longshots — often are in a race to sign up first in hopes that a bit of media attention will boost their campaigns. In 1991, a writer from New York drove 11 hours in a snowstorm only to find another perennial candidate waiting at the door. In 2007, a Minnesota fugitive living in Italy sent a package by courier that arrived just before an ex-convict embarked on a 90-minute rant that included five costume changes.Current candidates have until Oct. 27 to sign up, and dozens are expected to do in part because it’s relatively cheap and easy. They need only meet the basic requirements to be president, fill out a one-page form and pay a $1,000 filing fee.In 2020, 33 Democrats and 17 Republicans signed up. The all-time high was 1992, when 61 people got on the ballot. But this cycle could be notable instead for whose name isn’t on the ballot.New Hampshire, with its state law requiring its primaries to be held first, is defying the Democratic National Committee’s new primary calendar which calls for South Carolina to kick off voting on Feb. 3, followed by New Hampshire and Nevada. The shakeup came at the request of President Joe Biden in a bid to empower Black and other minority voters crucial to the party’s base.Biden’s campaign won’t comment on whether he will be on the ballot in New Hampshire. But he wouldn’t be the first reelection-seeking incumbent missing from the primary ballot: President Lyndon Johnson won the 1968 Democratic primary as a write-in, though a shockingly strong-second place showing by Sen. Eugene McCarthy helped push him out of the race.Scanlan, who served as deputy secretary of state for 20 years, said he was excited to welcome candidates starting Wednesday. Like his predecessor, he plans to greet them with a few encouraging words, but don’t expect the obscure trivia Gardner often added.“I don’t have any history lessons planned,” Scanlan said. “That was Bill’s style, and he was really, really good at it.”。

B | 深中通道桥梁工程顺利通过“大考”，朝着今年6月具备通车条件又迈进关键一步。深中通道是世界级“桥、岛、隧、水下互通”跨海集群工程，全长约24公里。其中，桥梁工程总长约17公里，包括伶仃洋大桥（悬索桥）、中山大桥（斜拉桥）和非通航孔引桥。荷载试验是大桥通车前必须经历的关键环节，分为静载试验和动载试验。通过等效模拟通车后的荷载情况，现场测试桥梁各部位的反应数据，判断桥梁承载能力是否符合设计要求和相关规范要求，为今后长期健康监测提供初始数据，也为日后养护、管理的决策提供科学依据和支持。

C | 据悉，在最大荷载工况的伶仃洋大桥静载试验过程中，136辆总重约5000吨大货车分批行驶上桥，按照17行×8列的要求停放在桥面预先划定的停靠点，进行分级加载，实测主梁、主塔、主缆和吊索的位移和应变，并与理论值进行比较，从而评估桥梁工作性能。在动载无障碍行车试验中，两辆满载共70吨、相当于约45辆小汽车重量的载重卡车，以每小时10至60公里不等的时速在大桥上匀速行驶，通过布置在中跨中断面的动应变传感器，测试结构在行车荷载作用下的动力反应，分析得到桥梁的冲击系数。“从目前掌握的数据来看，深中通道伶仃洋大桥、中山大桥、非通航孔引桥的实测值均小于理论值，且大部分指标富余较大。这意味着，深中通道桥梁工程不仅通过‘体检’，还可以说是在‘体能达标测试’中取得了不错的成绩。”广东交通集团深中通道管理中心副主任姚志安表示。目前，深中通道的机电、交安、路面、房建附属等工程正在全力推进，为6月具备通车条件冲刺。项目建成通车后，深圳至中山的车程将从目前的约2小时缩短至30分钟内。