The project team at Allegiant Stadium in Las Vegas has been running two races: first, a sprint to finish the $1.9-billion domed stadium in time for the NFL’s Raiders to play their first season in Las Vegas this fall, and second, staying a step ahead of the pandemic. Mortenson-McCarthy, the joint venture between M.A. Mortenson Co. and McCarthy Building Cos. that is serving as general contractor on the project, reports the 65,000-seat stadium remains on track for substantial completion in July, with the Raiders and University of Nevada Las Vegas football teams scheduled to play their first games there in August.

Allegiant Stadium, named for the Las Vegas-based airline, will be the biggest indoor venue in southern Nevada. The stadium will be available to host at least two-dozen non-football events a year, starting with a Garth Brooks concert set for August.

At least 15 new active cases of coronavirus have emerged among workers after the Southern Nevada Health District conducted nearly 850 tests at the site in early June. That’s in addition to 16 workers on site who tested positive before May 1, SNHD says.

Other employees have missed work because they were sheltering in place or taking care of sick relatives, but work at the site never stopped, and absences haven’t been a major issue, Mortenson-McCarthy says. The joint venture team says it is meeting all regulatory protocols and has instituted widespread safety policies because of the pandemic, including a focus on cleanliness and requiring masks and social distancing on the jobsite, whenever possible.

Eric Grenz, project director and vice president for the joint venture, says the additional safeguards, engineering controls and CDC preventative measures have added to costs, but the stadium will come in on budget and on time.

在tertainment Landmark

The sleek 1.8-million-sq-ft stadium, encased in black glass, creates a new landmark at the south end of the city’s tourist corridor and just west of the Las Vegas Strip. It will offer amenities worthy of what’s been dubbed the Entertainment Capital of the World, starting with the scenery.

The stadium, which sits on a northeast-southwest axis, is fully enclosed, but fans can view the nearby Strip through a 90-ft by 200-ft opening when four 50-ft-wide glass-and-steel lanai doors are opened. Lucas Oil Stadium in Indianapolis and U.S. Bank Stadium in Minneapolis offer fans views of their respective downtowns through similar window and sliding door systems.

“这确实是钱，也是在体育场里的地方。这就像打开前门，将条带作为您的风景一样，”格伦茨说。“这些是您在任何地方都可以找到的一些最大的可操作功能。”

忠实的体育场门将在活动期间保持开放，除非在拉斯维加斯夏季的灼热期或风速前25英里 /小时。袭击者还将被要求在沙漠雷暴时在附近有警告的气象监测站。

一个93英尺高的永恒火炬是已故突袭者Al Davis的纪念馆，将向体育场内的游客致意。火炬将具有特殊效应的火焰，是使用3D打印机在225个印刷块上创建了5500层的。突袭者正在寻求将其纳入《吉尼斯世界纪录》中，这是有史以来最大的3D打印结构。火炬被一个圆形的酒吧包围，该酒吧将成为55,000平方英尺的蠕动俱乐部的一部分，这是计划参加该体育场的九个俱乐部之一。该体育场还将设有10个活动空间，127个套房，8,000个俱乐部座位，2,200台电视和LED标志以及1,700个WiFi访问点。

“People will recognize this as part of the Las Vegas entertainment experience,” says Lanson Nichols, vice president of sports architecture for Kansas City, Mo.-based HNTB Corp., the architect of record for the project.

The project, which is being built with all union labor, is topped by a 7-acre ethylene tetrafluoroethylene (ETFE) roof that designers say will give fans an outdoor feel but with an indoor, climate-controlled setting. A cable net truss system of 100 stainless steel cables creates the diaphragm of the roof structure.

迄今为止，建筑需要超过125,000立方英尺的混凝土和28,000吨结构钢。

Crews encountered the project’s most significant construction setback in October when a subcontractor was jacking and tensioning the cable net system and a compression ring splice plate connection failed. The erection and tensioning of the cable net system needed to be done in a way to prevent connections on the ring beam from being overstressed.

经过十多个星期的学习和计划，提升操作恢复了无障碍。新利luck延迟需要格伦茨所说的“全动手甲板方法来完成ETFE屋顶”，并保护内部免受元素的侵害。

“Although we experienced the splice plate connection failure, the cable net truss system looks stunning,” he says.

If the airy ETFE roof and gigantic window facing the Strip weren’t enough of an outdoor feel, fans can watch the players get real grass stains on their uniforms.

Allegiant Stadium will have an artificial surface for the UNLV Rebels, but the Raiders will play on a grass field that’s retracted when not in use. It’s the second stadium in the country with such a system and one of just a few in the world.

“That was Mr. Davis’ commitment,” says stadium designer Nichols of current Raiders’ owner Mark Davis, son of Al Davis. “He’s a football purist, and football must be played on grass.”

天然草皮田将保持在400英尺x 220英尺的托盘中，当充满土壤和草时重10,000吨。将其800英尺移到体育场的外部，那里的草在沙漠阳光下生长，需要540个车轮，由72个电动机供电。这次旅行将需要71分钟，使托盘平均每分钟3英寸3英寸。

Along with the opening for the turf tray, the stadium’s big bay doors will allow trucks direct access to the field to deliver and remove equipment.

“Event changeover is everything in any arena. That’s what makes you competitive in the trade-show businesses,” says Nichols, who envisions the space also being used for trade shows and product launches.

Vegas Speed

该体育场于2017年11月破土动工，以“维加斯速度”汇聚在一起。他的成员安装了野外托盘，并执行了许多其他工作，包括屋顶安装，混凝土放置，铺设摊铺机，园林绿化，消毒，地下公用事业安装以及为基础爆炸了30英尺。

“We built one of the best-looking stadiums in a short period of time,” White says.

从开始到完成的三年不到三年的压缩时间表被视为团队面临的最大挑战。“时间不是朋友。尼科尔斯说，他在其他NFL体育场工作，并说Allegiant的时间表最紧。他将设计构建视为“您可以达到必要的时间表压缩的唯一途径”。

格伦茨同意，说设计建造是该项目的“秘密酱汁”。他说：“可能没有另一个体育场在它带走的时间进行设计和建造。”

“它使我们能够与设计师并肩作战，并在预算和时间表上锁着一个设施。”

As of early June, workers had logged more than 5.8 million hours, with the workforce averaging about 2,200 people during peak construction. The project’s OSHA recordable incident rate is 1.1, compared with a national average of more than 3.0.

Nearly 25% of all work awarded on the project has gone to small businesses. That beats the goal of 15% that was set after state and local officials agreed to contribute $750 million in public funding toward construction. The joint venture reports that workforce utilization for minority- and women-owned (MBE) firms has reached 62%, compared with the initial goal of 38%.

“We know that the success of each of our projects is directly linked to those efforts and partnerships with minority-owned, woman-owned and small businesses,” Grenz says.

Grenz has worked on college and pro stadiums and arenas for most of his career, but he says he will remember Allegiant Stadium as an opportunity to overcome “the incredible obstacles put in our way,” from early steel supply chain issues to challenges with the cable net truss system to the ongoing COVID-19 pandemic.

“Getting to work on a project of this size and complexity through times of adversity, ambiguity and unchartered territories has been tremendous,” he says.