McCarran International Airport MSE Wall/Helix Bridge/Taxiway Bridge Repair
After almost twenty (20) years of service, sections of a Mechanically Stabilized Earth (MSE) wall located near the main Terminal were jutting out of plane because of a buildup of hydrostatic pressure behind the wall. In order to prevent infiltration that would contribute to...
I-15 Design-Build South NDOT Bridge H-2948
Bridge H-2948 is a 435-foot long, 4-span Cast-In-Place Post-Tensioned (CIP P/T) concrete box girder bridge of uniform width with an intermediate straddle bent that carries the Southbound Collector/Distributor (C/D) Road 1 over Blue Diamond Road. Sigma prepared all construction plans, specifications, and estimates. Sigma also provided...
I-15 Design-Build South NDOT Bridge H-2956
Bridge H-2956 is a 356-foot long, three-span Cast-In-Place, Post-Tensioned (CIP P/T) concrete box girder bridge with a straddle bent and a single column bent that carries the Southbound Collector/Distributor (C/D) Road 2 over the Southbound I-15 to Eastbound I-215 Ramp. Sigma prepared all construction plans,...
Vegas Verdes Elementary School Modernization
Sigma provided civil engineering services for the renovation of a fifty-year-old school on an 8.1 acre site that involved HVAC, plumbing, and ADA improvements. This project included utility design for new water connections, fire hydrants, fire protection loop, backflow preventers, and sewer connections. The parking...
I-15 Design-Build South Structural Lead
The I-15 South Design-Build project stretches from Tropicana Avenue to just south of Silverado Ranch Boulevard in Clark County, Nevada. The project involves the widening of I-15, the addition of collector-distributor roads, redesigned interchanges, and the delivery of the design of 26 new bridges and...
Tropicana Hotel 3000 Wing Implosion
Sigma provided on-site structural monitoring, visual observation, and three-dimensional survey recording of structural movement throughout all phases of the demolition sequence for the 3000 Wing of the Tropicana Hotel. Sigma engineers advised the contractor regarding structure safety and stability during the process. Footage of the...
Boulder City Special Events Sign
Sigma designed a structural wall to hold a 15 foot, 7 inch x 8 foot, 6 inch light emitting diode (LED) display sign and developed the land in the project area at the northeast corner of the intersection of U.S. 93 and Nevada...
Clark County Real Property Management Parking Lots
Sigma provided civil engineering design services for parking lot and accessibility improvements at a fire station, a community center, and a park in Clark County, Nevada. The resulting design deliverables for each location included a demolition plan, a grading plan, and a signage and striping...
YouTube Engineered Demolition Channel
Check out Sigma's YouTube Engineered Demolition Channel! Featured projects include the McCarran ATS Tunnel Demolition and the Hunters Point Power Plant Demolition.
North Las Vegas Airport Flood Control Channel Improvements
Sigma designed and prepared project plans, specifications, and construction cost estimates for flood channel improvements located at the North Las Vegas Airport. These improvements addressed two major hazards associated with flood control. The first hazard involved frequent flooding of the V-ditch storm drain channel adjacent...
Christchurch, New Zealand Demolition Support
Sigma was contracted to assist the United States Army Corps of Engineers Pacific Command with earthquake recovery efforts in Christchurch, New Zealand in March and April 2011. Sigma’s primary tasks were to provide demolition engineering expertise and valuable advice to the team from the United States...
Duck Creek Channel Construction Support Services
Sigma provided Civil Engineering Construction Support Services for the Duck Creek Channel project between Mountain Vista Street and Green Valley Parkway. The scope of work included a site visit to investigate existing conditions and to document and review proposed improvement areas. Sigma assisted with the...
Flight Path Temporary Traffic Signal
Sigma prepared a temporary traffic signal plan during a traffic control phase for a roadway realignment project at McCarran International Airport. Sigma staff reviewed the contractor's initial plans, coordinated meetings with Clark County Public Works, and prepared and submitted plans for approval to Bechtel.
Hunters Point Power Plant Engineered Demolition
Sigma provided the analysis and the preparation of the engineered demolition plan for PG&E’s Hunters Point Power Plant in San Francisco, California. Footage is available on our YouTube Channel[http://www.youtube.com/user/SigmaNV]. The power plant was originally constructed circa 1928 at Hunters Point at the edge of the...
Las Vegas National Golf Course Bridge Replacement
Sigma prepared bridge hydraulic analysis and design for the replacement of two pedestrian/golf cart bridge structures at the Las Vegas National Golf Course located in Las Vegas, Nevada. The two structures were replaced with structures of similar size, span, configuration, and overall length. One of...
McCarran International Airport Automated Transit System Tunnel Demolition
Sigma provided demolition engineering services for the isolation and partial demolition of this post-tensioned concrete tunnel that was built as part of the new Terminal 3 expansion project. A tunnel demolition plan was designed for 60 linear feet of an existing Automated Transit Tunnel located...
McCarran International Airport C-Tram Bridge
The C-Tram bridges provide automated transit system (ATS) service for passengers traveling between the main terminal and the C-Gates at McCarran International Airport. At the time of this project, the two elevated parallel bridge structures for the ATS were approximately 25 years old and started...
McGuire/Carpenters Building
Sigma was the engineer of record, and is presently involved in the conventional demolition of the 26 story McGuire building, located in downtown Seattle, WA. This project involves the demolition of a post-tensioned concrete slab building, including a complex removal scheme, piece-by-piece removals, and use...
Mountain View Generating Station
Sigma provided plans, procedures, and structural calculations for the engineered demolition of two steam boiler units and the associated steel framing support system located at the Southern California Edison Mountain View Generating Station in San Bernardino, California. The demolition of the boilers consisted of 28 separate...
Red Rock Resort Event Area
Sigma provided civil engineering design services for an 8,800-seat concert venue with a 60-foot by 40-foot stage located at a hotel-casino in Clark County, Nevada. These design services included a demolition plan, a grading and drainage plan, a utility plan, and retaining wall profiles and...
Nye County Jail
Sigma provided civil engineering design services associated with a new 225-bed detention facility on a partially developed 3.2 acre site. The scope included on-site demolition, grading, storm drain design, open channel design, sanitary sewer design, water main design, masonry retaining wall design, a Traffic Mitigation Letter,...
I-15 Design-Build South Falsework and Shoring Design
Sigma provided falsework design for eleven bridges (Numbers 2, 3, 5, 6, 7, 9, 10, 11, 20, 21, and 24) and shoring design for five bridges (Numbers 9, 10, 20, 21, and 24) for the Interstate 15 (I-15) South Design-Build Project. Sigma staff provided...