在主要枢纽机场，对于忙碌的旅行者来说，几乎没有什么比航班之间平稳的联系更重要的。因此，在长达45亿美元的重建计划的第一阶段和第二阶段之间，盐湖城国际机场（SLC）（SLC）几乎无法检测到的交接是适当的。

On Sept. 16, 2020, the day after SLC officially unveiled its 909,000-sq-ft terminal and 457,000-sq-ft, 25-gate south concourse, crews from the joint venture of Holder Construction and Big-D Construction (HDJV) began demolition work for the program’s $540-million second phase.

Included are a 22-gate east extension to the south concourse that will open in stages beginning in May 2023 and a 990-ft-long central access tunnel to the 477,000-sq-ft, 22-gate north concourse—another Phase 1 project built by the Austin Commercial/Okland Construction Co. joint venture and opened in October 2020.

“No rest for the weary,” jokes HDJV project director Kevin Fauvell, who adds that “the transition was planned to be seamless, and it worked out that way.”

A new 990-ft five-bay underground connection between the north and south concourses can accommodate the eventual addition of an automated people mover system.
照片由SLC国际机场提供

Just months before the Phase 1 opening, the urgency to sustain such a major aviation building program might have seemed incongruous with the uncertainties of a pandemic-depressed airline industry.

盐湖城机场部执行董事比尔·怀亚特（Bill Wyatt）回忆说：“在这里，我们将开设一个全新的机场，我们的乘客数量约为它的10％。”Although SLC worked with the airlines to build as much flexibility into the Phase 2 construction plan as possible, such as incorporating “off and on ramps” to pause and restart work if needed, 2020’s gradual trend toward normalcy provided confidence to keep the program at full speed.

“We priced it out, and the airlines approved,” Wyatt says.

SLC’s rebound has been so strong that earlier this year, HDJV was authorized to begin a $333-million Phase 3, which includes the first eight gates of what will eventually be a 22-gate east extension of the north concourse, a central connecting plaza to that facility’s west gates and the interior finishes and systems in the central tunnel.

大厅的设计使自己易于扩展，包括在添加新大门时将不断发展的机械，电气和信息技术系统纳入。
照片由SLC国际机场提供

一种地方感

While the new concourses’ linear layout is better suited to incremental need-driven expansion and efficiency than SLC’s previous configuration of finger-style concourses, the HOK-led design team sought to incorporate a sense of place into the buildings.

“The problem with hub airports is that they tend to evolve and often end up being rather generic,” explains Matt Needham, director of aviation for HOK, which led the design of SLC’s redevelopment program. Because SLC is, in essence, a brand-new airport, “We wanted to do what we could to make sure passengers know where they are,” he says.

虽然附近的瓦萨奇提供了一个明信片,前面perfect backdrop, Needham says it was important not to overdo windows and compromise the project’s ability to achieve LEED Gold certification.

“Instead, we use daylight harvesting, with automatic controls on the windows to adjust tint during the day,” he says.

Wyatt补充说，该设计的另一个优点是，很少需要适应后期的现实。他说：“我们将过滤器升级为Merv 14，并将打喷嚏的警卫添加到柜台和其他固定工人与乘客打交道的地方。”

铜护套与自动控制的窗户着色相结合，回荡了盐湖谷的独特景观。
照片由SLC国际机场提供

Tearing Down, Building Up

HDJV’s first major task under Phase 2 was removal of most of the last vestiges of the “old SLC” to make way for the south concourse expansion. The newly decommissioned terminals and concourses and a parking deck were demolished in six months, creating 280,000 tons of material, of which 85% was reused. Concrete was ground into onsite backfill material while steel and other components were sent to offsite recycling plants.

Mike Williams, hired by SLC in 2012 to serve as an independent program director for the redevelopment, notes that despite decades of use, the cleared site for the terminal expansion presented few significant underground obstacles to continuing construction.

他说：“您总是计划意外的事情，尤其是在一个旧机场已经存在了很长时间的情况下。”“我们所遇到的只是几个旧的会议周围的燃料污染土壤。”

As with Phase 1, the north and south concourse extensions and central tunnel required ground stabilization measures necessary to accommodate SLC’s location in a seismically active former lake bed. Hundreds of 3-ft-dia holes laid out in 10-ft by 10-ft grids and drilled 45 ft deep are pressure filled with small stones to prevent liquefaction in the event of an earthquake, such as the magnitude 5.7 event that rattled Salt Lake City in March 2020.

威廉姆斯说，该建筑物和隧道建立在驱动的复合材料和H-Piles的结合下，最平均65英尺至75英尺的深度。South Concourse扩展将估计包含5800吨钢筋结构钢和17,657立方英尺的混凝土，而向北部大厅的3期扩展将需要3,000吨钢和8,500立方米的混凝土。

Phase 2’s other major element, the new central tunnel, will augment an existing mid-concourse connecting the north and south concourses.

Constructed using a cut-and-cover method, the 106,140-sq-ft tunnel’s passenger walkway cell will be highlighted by “The River,” a full-length membrane sculpture made up of individual aluminum-framed “fins” wrapped with a fabric material. Separate tunnel cells are provided for high-speed baggage systems, central utility plant distribution and the eventual addition of automated people movers.

Hok的Needham说：“这些细胞旨在容纳几乎每种可用的技术，为机场的长期决策提供了灵活性。”

With SLC’s water table only 7 ft below the surface, excavating 65 ft deep to construct the tunnel required sheet piles and an extensive dewatering system. Less than a year after the first bottom slab was placed in July 2021, Fauvell says, the tunnel was complete and backfilled.

他补充说：“到今年年底，我们应该将表面铺成铺成并完全开放为Concourses之间的滑行道。”

威廉姆斯说，迄今为止，建筑能够在繁忙的盐湖城建筑市场中均领先于行业范围内的供应链问题和劳动力短缺。

他说：“我们最近对水泥粉有一个问题，幸运的是，这似乎正在放松。”“但是，接下来的一两年可能具有挑战性。授予后，我们将与贸易承包商合作，尽快完成所有提交和批准，以便他们订购材料。”

Fauvell补充说，该团队一直关注这些材料的状态和移动，尤其是因为该项目的40％来自海外。

“The airport has been good about allowing the trades to bill for more stored material and makes sure what we need is here,” he adds.

Unfortunately, the project has not been immune to tragedy. Last November, a worker for subcontractor SoNev Construction was fatally injured while performing equipment maintenance away from the construction site. SLC says the Occupational Safety and Health Administration completed its investigation but has yet to take any action.

第二阶段的基础将超过32英里的驱动桩与广泛的地面稳定措施相结合，以确保新的Concourses承受重大的地震事件。
照片由SLC国际机场提供

Flight Planning

Plans call for the first four gates of the south concourse extension to open in May 2023, with the remaining 18 gates to follow later that year. The staggered opening of the north concourse’s Phase 3 gates in 2024 and 2025 will enable the airport to smoothly phase out the last of its temporary “hardstand” operations, where passengers access parked aircraft via shuttles. The remainder of the north concourse’s east side extension, being designed by HOK, will give SLC a total of 94 gates—a capacity that Wyatt says could be achieved by 2027.

他说：“就市场上的航空公司座位而言，我们可能是该国最恢复的机场。”“航空公司对继续扩张表示强烈的兴趣。”

Fauvell calls participating in construction of the nation’s first major airport in a generation “a once in a lifetime opportunity” and praises the teamwide cooperation. “We didn’t always agree, but we always found a resolution,” he says.

Wyatt adds that SLC’s ability to reinvent itself, literally and figuratively, and nearly double the number of jet bridges in just seven years is a credit to the administrative structure that oversees such a massive multi-faceted construction operation.

“Building a structure of communications that keeps us up to speed and puts decisions in front of us as we need to make them has been invaluable,” he says. “Had we tried to manage construction without this structure in place, I don’t think we’d be open today.”

Adds Williams: “When you have a big machine like this moving, you don’t want it to stop.”