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UPRR Bridge 24.75 Emergency Replacement Sioux City Sub - Total Bridge Replacement in 8 days

机译：UPRR桥梁24.75紧急更换苏城分局-8天的总桥梁更换

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The existing UPRR Bridge 24.75 on the Sioux City Subdivision consisted of a four span (45'-90'-60'-45') bridge across the Monona Harrison Ditch just north of the mouth of the Little Sioux River. The afternoon of August 19, 2015, UPRR got the call that their bridge had washed out. The call came in time to stop the next train and prevent a derailment. The main river pier had fallen and the center 90' and 60' spans were partially submerged. UPRR immediately mobilized crews and emergency response teams to the site. By mid-afternoon on the 20~(th), the 90' and 60' spans were removed with a plan in place to replace the fallen bridge with a new 5-span structure that would utilize the existing abutments. OCCI would construct innovative pipe pile bents with precast concrete caps incorporating materials that were immediately available. OCCI, Inc. began mobilization on Aug 22~(nd) to move crews and equipment to the site. UPRR had possession of the 3 long spans and procured the 2 new custom short end spans that allowed for significantly reduced loads on the existing abutments. The two new river bents were the most challenging, and constructed utilizing two 300-ton crawler cranes (one on each river bank). The two end bents were constructed by UPRR forces using a locomotive crane on each end of the bridge. The first train crossed the new bridge on the evening of August 28~(th). Ultimately, the project team designed and constructed the new bridge, working around the clock, in 8 days.
机译：苏城市分区上现有的UPRR桥24.75由四跨（45'-90'-60'-45'）桥组成，横跨小苏河河口以北的莫诺纳·哈里森沟。 2015年8月19日下午，UPRR接到了他们的桥梁被冲走的电话。呼叫及时到来，以停止下一班火车并防止脱轨。主要河墩已经跌落，中心的90'和60'跨度被部分淹没。 UPRR立即动员了工作人员和应急小组到现场。到20日下午中旬，拆除了90'和60'的跨度，并制定了计划，用新的5跨度结构替换倒塌的桥梁，该结构将利用现有的基台。 OCCI将用预制的混凝土盖建造创新的管桩弯管，并采用可立即使用的材料。 OCCI，Inc.从8月22日开始动员，将工作人员和设备转移到现场。 UPRR拥有3个大跨度，并采购了2个新的定制短端跨度，从而大大减少了现有基台的载荷。这两个新的河道最具挑战性，它们是使用两台300吨履带式起重机（每条河岸一台）建造的。两端弯头是由UPRR力在桥的两端使用机车起重机构造的。 8月28日晚上，第一列火车过了新桥。最终，项目团队在8天之内全天候设计和建造了新桥。

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