Kiewit Infrastructure West Co. has begun replacing the Virgin River Bridge No. 1 on Interstate 15 near the town of Littlefield in northwest Arizona. Kiewit is working as construction manager at risk for the $56-million Arizona Dept. of Transportation project.

“The contractor and its team will be replacing the bridge in its entirety and modifying the existing five-span structure to a three-span structure in the process, thus eliminating two columns and associated foundations in the river bottom,” says Brenden Foley, ADOT’s assistant district engineer of construction for the Northcentral District.

Kiewit的范围包括Cofferdams，以在大约100英尺深的大约钻孔轴上构建基础。此外，团队将取代基台基础，码头和桥梁甲板，并添加人行道，路面标记，护栏和标牌。

The Kiewit team also will erect a three-span temporary bridge above the river for construction access to build the bridge, explains Kiewit project manager Matt Lacey.

ADOT has divided the project into two main phases: a construction phase of 900 calendar days for demolition of the old bridge and construction of the new one, followed by a one-year landscape establishment phase to monitor and maintain the revegetation process.

在其范围内，Kiewit将以五个阶段完成该项目。

在大多数情况下,第一阶段将包括贝尔工作ow the bridge without impact to motorists, Foley explains. This phase will establish the staging area and access roads to the river bottom, as well as construction of the substructure, including drilled shafts, columns and piers.

在第二阶段，将通过转移所有交通以共享桥的北半部（南行车道），并在每个方向上有一个行进车道来建造桥的南半（北行车道）。

In phase three, traffic will shift to the completed northbound lanes to share that portion of the bridge, with one lane in each direction, while Kiewit constructs the southbound lanes.

交通流量为第四阶段的正常模式，但每个方向都有一条车道，而工作人员完成了桥梁甲板的最终混凝土位置。

最后的第五阶段将完成道路铺路，并在每个方向上打开两条车道，交通转移到新桥上的正常模式，以及最终的清理和植被。

“The proximity of the river and numerous protected species and plants requires a comprehensive environmental management program,” Lacey explains.

All construction is scheduled for completion in May 2024. Standard penalties apply if work is not completed within the allotted time frame, and no early delivery incentive is included, Foley says.

第一号桥梁的重建继续在2014年初开始在七个I-15 Virgin River Bridges上进行一系列ADOT康复项目。18luck官网7已完成，最近一次是在2016年进行了重建第6号桥梁，其中包括扩大和替换上层建筑。

偏远的亚利桑那州道路是盐湖城，拉斯维加斯和洛杉矶之间的重要运输联系，以及连接加拿大和墨西哥的Canamex走廊的一部分。结果，该项目将包括在施工期间使用的移动应用程序，以使旅行者了解。

莱西说：“这将使人们穿越走廊的人们可以获取有关任何临时关闭，延迟，交通控制配置和其他与施工相关的更新的信息。”