科罗拉多州的运输部正在押注，其最大的项目（12亿美元的中央70扩展）将证明，高速公路公私伙伴关系在科罗拉多州的效果比在该国其他地区的效果更好。70号州际公路项目包括重建从丹佛市中心的布莱顿大道到东部奥罗拉的钱伯斯路10英里的高速公路。

该项目在每个方向上增加了一个新的快车通道，并取下了57岁的1.8英里长的高架桥，用降低的高速公路代替了它，其中包括1,000英尺长的帽子，这是一条公路的覆盖部分将是一个占地四英亩的公园的所在地，以帮助重新连接长途划分的社区。

This aerial from February shows vehicles on the viaduct before the Mile High Shift of traffic through the covered section north of the highway. Cross streets that previously ran under the viaduct are being rebuilt at grade and run above the covered section.
图片由CDOT提供

纠正旧错误

CDOT于2004年首次提议，CDOT表示，Central 70项目将减轻I-70的现有交通拥堵，可容纳预计的交通增加，并解决了高架桥的问题，而高架桥的问题是六车道道路的关键部分，并在2008年被视为结构上的缺陷。。

Originally designed and built through Denver in the 1960s and ’70s (a time with many fewer environmental regulations), the highway and its viaduct cut a swath directly through the Denver neighborhoods of Globeville and Elyrea-Swansea (GES), located just northeast of downtown.

CDOT项目总监鲍勃·海斯（Bob Hays）说：“挑战是，我们如何尽最大努力使这一正确的权利。”他说，完成后，Central 70将减少高速公路噪声对社区的影响并改善移动性。高速公路上的新十字街和桥梁包括8英尺至10英尺的人行道和ADA符合ADA的十字路口，大大改善了行人安全性，而不是在旧的高架桥下穿过，这是一个没有人行道的黑暗走廊。

该计划并非没有争议。它需要拆除56个住宅和17个企业，并面临有关该项目影响的邻里和环保组织的反对。

Multiple pieces of litigation to stop the project were largely unsuccessful, except for an eventual settlement approved by the Colorado Transportation Commission in December 2018, resolving the last legal challenge.

Per the agreement, CDOT contributed $550,000 for an independent neighborhood health study, $25,000 for a monitoring position on the study’s team and another $25,000 for additional trees and landscaping along neighborhood boundaries.

CDOT is monitoring and reporting PM10 (particulate matter with a diameter of 10 micrometers or less) on its project website, per NEPA regulations.
But Gregg Thomas, director of the Denver Dept. of Public Health and Environment’s environmental quality division, said via email that the project goes beyond NEPA’s legal requirements, citing the city’s partnership with CDOT to independently monitor a “full suite of real-time air pollutants.”

这包括在斯旺西小学对较小的PM2.5和黑碳进行小时监控，他们的学生将使用在高速公路上限上建造的公园和足球场。

托马斯说：“这是我知道的第一个主要的高速公路重建项目，正在监视附近该项目附近的一套实时空气污染物。”

The monitoring will continue post-construction for at least six months, with ongoing monitoring at the school funded by the city’s Love My Air program.

替代交付

中央70的早期挑战是弄清楚CDOT将如何付出12亿美元的账单。CTC建议通过2015年初的公私合作伙伴关系实施该项目。

“一旦您评估了与该项目相关的所有风险（我们作为所有者可以共享或转移风险向私营部门的方式），这使我们很有意义，在所有这些风险分析之后，我们可以使用P3，海斯说。

在2017年1月，联邦高速公路管理局的最终批准之后，CDOT开始了为期30年的设计建造 - 筹集资金 - 操作性自我维护（DBFOM）合作伙伴的长达18个月的采购过程。在30年期结束时，CDOT将承担所有权并负责持续的维护。

海斯说：“我们能够与四个入围的团队进行谈判，与他们会面并谈判风险应该在哪里。”“到最后，我们已经达到了私人一方愿意竞标该项目的平衡，但是我们仍然获得了将风险从纳税人转移的所有好处。”

投资集团Meridiam与总部位于奥马哈的Kiewit Corp.合作，创建了Kiewit Meridiam合作伙伴（KMP），该团队于2017年8月被选为P3开发人员。

拆除I-70高架桥剩余部分的剩余部分在新的Cross Street交通以及现有房屋和相邻企业周围的一根针头。
南希·克里斯托夫（Nancy Kristof）的图像

开球协调

With a groundbreaking targeted for summer 2018, the KMP team relied on strong relationships and “good old-fashioned communication” with CDOT, the city and multiple third-party stakeholders, including Denver Water and Union Pacific Railroad.

“丹佛水与我们是一个巨大的界面，因为整个项目中有三个水导管，” Kiewit的设计建筑经理Jason Proskovec说。“每英亩有850英尺的实用程序，在我们的世界中，这有点不在图表上。”

他补充说：“从公用事业的角度来看，这取得了巨大的成功。”他认为CDOT使用Prostar Pointman软件的倡议来帮助管理从Potholing收集的所有数据，并说：“我可以准确地看到所有实用程序的实时位置。”

Proskovec noted an added schedule benefit of the team’s “hefty level” of collaboration with Union Pacific Railroad, which ultimately “changed the track phasing to help save about five months on the schedule,” he says, even though track-phasing changes were originally off the table.

KMP团队还包括由WSP领导的27家不同的设计公司，这些公司“与承包商，开发商和所有者共同列为。WSP设计经理Jason Buechler说。

Proskovec补充说：“让所有这些不同的利益相关者成为项目目标的一部分是成功的关键。”

重新连接社区

KMP公共信息官Matt Sanman表示，整个项目范围已完成约80％。除了安装收费设备，标牌和美化环境外，该项目的五英里长的东段扩大了。

沿3.5英里长的中央部门完成的活动包括建造I-70的内车道，新的和重新定位的坡道，沿北部正面路的公用事业安装和搬迁，以及拆除丹佛岩石岛铁路（DRIR）桥梁在十字路口上有四座I-70桥。沿着外道建造了新的桥梁。

Additional ramp, bridge and street reconstructions, including the DRIR bridge, are continuing as portions of the highway are repaved. But the signature element of Central 70 is placement of the freeway cap and its four-acre park located in the 1.5-mile-long west segment that runs through the GES neighborhoods.

The cap’s 1,000-ft-wide, two-span structure is like a tunnel that required installation of life-safety systems, says Buechler. The cap supports two cross streets and the park, which includes a soccer field and playground used by Swansea Elementary students during school days as well as a small amphitheater, splash park and landscaped areas for community use when school is out.

Buechler says the cap also is one of the first road tunnels where the fixed firefighting system (FFFS) and ventilation system designs were fully integrated, allowing for a reduction in ventilation capacity because of mitigation provided by the FFFS.

他说：“形成隧道屋顶的桥梁是用耐火混凝土设计的，消除了天花板上的防火，并最大程度地减少了未来的维护成本。”新利18备用官网登录

The tunnel’s active ventilation system includes eight fans (and one spare) on each side of the structure. Monitoring devices will activate an appropriate number of fans if certain emissions or smoke levels are reached.

在低年级的高速公路上转移高速公路交通需要平衡使道路表面远离地下水，同时维持足够的垂直间隙，用于桥梁交叉和公园。

“We basically built a bathtub,” says Hays, a solution that also presented stormwater challenges. Working with Jacobs as a subconsultant, the team devised a solution where runoff flows through trench drains to the low point, entering a lift station that pumps it 35 ft back up to grade.

Hays says this is a unique part of the system, which then transitions to a traditional water-quality pond before it’s discharged into conduits carrying it into the South Platte River.

一个单独的混凝土储罐是adjacen建造的t to the pump station to accommodate the 3,500 gallons of water per minute that the deluge system would drop if triggered by a fire. This potentially contaminated water is diverted into a separate drainage system and tank until it can be tested and treated as necessary.

“It was very important to us that we made sure to keep those two water sources separate so that we don’t end up contaminating the Platte River,” Hays says.

The project involves rebuilding many cross street intersections and bridges. A plan to communicate the impacts of construction activity to residents and businesses adjacent to the project was put in place early to ensure a seamless transition into construction operations.
Image courtesy of CDOT

一个高度可见的里程碑

CDOT在5月庆祝了所谓的“英里高档”，将高速公路交通转移到高架桥，并通过部分完成的隧道将高速公路交通转移到每个方向上的三个车道。这使Kiewit可以开始自我表现，因为隧道最终的东行车道的发掘仍在继续自我表现。完成后，隧道将在每个方向上携带四个车道，包括新的Express车道。

Hays says viaduct materials are being 100% recycled. The steel is melted down for reuse while the concrete is processed on site at a crushing yard at Quebec Street.

The concrete will be reused as new road base for the eventual eastbound lanes of I-70, with any excess available for other road projects.

仅剩下的高架桥的几部分要删除，该项目的进度更为明显。海斯说，一旦高架桥终于下降了“这将是一个很棒的改进，不仅对于科罗拉多州的通勤者，而且对于社区而言。”

He expects the project to come in or under budget, noting good fortune so far when it comes to unforeseen conditions as well as the benefits from the P3 in refinancing some of the debt.

“It’s incredibly complex,” he says. “All aspects of it are complex, the community involvement, coordination with third parties, the number of utilities we’ve had to move, the way the public-private-partnership contract is laid out, all the way down to the engineering.”

He adds: “It’s a once-a-career-type project, and it is awesome to be a part of it.”