走秀步道重建
格伦伍德（Glenwood）
Region新利18备用西南
小型项目（1000万美元以下）
项目团队
Owner/Developer:Federal Highway Administration, Central Federal Lands Highway Division
设计公司：Bohannan Huston Inc.
General Contractor:AUI Inc.
民用/结构工程师：Bohannan Huston
岩土工程师：NV5
Subcontractors:Saguaro GeoServices Inc.；Kimo Constructors Inc.；富兰克林钻探和爆破；西南混凝土公司
重建一条穿过吉拉国家森林偏远地区的狭窄峡谷的小径提出了许多挑战和所需的替补工程。自然事件促成了该项目。2012年的野火是新墨西哥州历史上最大的野火，烧毁了297,000英亩，使该地区更容易遭受洪水的影响。第二年，一次严重的暴雨淹没了白水峡谷，破坏了历史悠久的时装秀。
The parameters of the trail’s rebuild included the design and construction of three steel bridges along with 700 ft of suspended catwalk in the slot canyon. Workers restored primitive trails leading to the bridges, removed creek obstructions and flood-damaged structures, and preserved historical and archaeological elements.
The rock faces of the angulating canyon walls, with their pockets and overhangs, presented spatial puzzles. In addition, the trail’s vertical grade had to comply with accessibility guidelines, while its horizontal positioning had to keep the trail close to the canyon walls to minimize material used and the structure’s visual impact.
Due to the complex facets of the slot canyon walls, the project team used light detection and ranging (LiDAR) scanning, supplemented by a conventional ground survey, to accurately capture every nook and cranny of the canyon in a dense 3D mesh made up of millions of survey points. According to the construction team, mapping the canyon was critical to the project’s success because it allowed designers to locate with pinpoint accuracy where the support beams should be placed in the canyon walls and thereby minimize potential construction delays.
扫描，测量和建模还提供了必要的准确数据，以设计和确定小溪地板上方的时装秀的高度，以最大程度地减少未来洪水损失的风险。现场条件导致了标记光束放置的独特解决方案：将钢筋驱动到峡谷墙壁并弯曲以匹配所需的轴承。
大石块不得不被删除以反式port excavators, loaders, forklifts and man lifts to the site. To avoid the hazards associated with scaffolding and temporary ladders, the majority of the catwalk was constructed using man lifts. During the construction phase, from January through May, water levels in the canyon were typically at 1 to 2 ft, adding a bit more effort to the workers’ hike to the jobsite.
有了60英里以上的总材料的最接近来源，至关重要的是最大程度地减少进口需求。结果，使用现场材料构建了用于侵蚀控制的Gabion篮子和RIP RAP。
安排是一个问题，因为这条小径是小镇格伦伍德的主要经济吸引力。它的重新开放对于该镇小型企业的生存至关重要。由于时间表紧密和偏远位置，团队确定，在12英尺至20英尺的截面中，将场外钢供应商的人行道平台预先制动会更有效。该策略在最大程度地减少现场拟合和按时完成项目的能力方面发挥了重要作用。
新结构是cantilever beam-supported catwalk that embraces the historical vision of floating above the canyon floor while functionally avoiding debris-catching structural elements. The $4.6-million project was completed a month ahead of schedule.
