The delivery, checking and assembly of several hundred elements for a complex cable-net roof structure had the potential to create a logistical nightmare for engineers at the Allegiant Stadium in Las Vegas.

Not only did the roof construction have to meet a very tight timescale, but all information was provided in digital format, as mandated by the design-build contractor.

  • Name of the owner
    LV Stadium Events Company, LLC
  • Name of the client
    Mortenson-McCarthy Las Vegas Stadium JV
  • Delivery date of the project
    March 2020
  • Partners of the project
    Design-build contractor: Mortenson-McCarthy Las Vegas Stadium JV
    Designer: Arup
Key figures

A cable roof
for the Allegiant Stadium

Freyssinet was contracted to design, supply and erect a cable-net roof structure for the Allegiant Stadium, a new venue which seats up to 72,000 people for sporting and other events. The lens-shaped roof is made of 100 fully locked-coil cables of various diameters on a perpendicular grid, with 152 struts connecting the top and bottom nets by means of a large number of connectors and anchors. An ETFE membrane on top of the cables enables the stadium to be turned into an indoor venue.

Digital working

In the event, the requirement to work with a BIM model proved advantageous to Freyssinet’s team and prompted them to develop and implement a digital tool to support their own production, checking and quality control regimes.

The contract was for design and supply of locked-coil cables, cable clamps and steel struts, design and installation of temporary works and supervision of the lifting and installation process. The net structure was assembled on the ground before being raised into place by 50 Hebetec strand jacks and 100 hollow jacks.

 

“DigitalSite was used to help us install and inspect the roof of the stadium, which incorporated more than 150,000 different elements. This innovative tool allowed us to carry out the quality control process very efficiently and also proved useful to the site team thanks to its 3D viewer. It is one of the main factors contributing to the success of the project.” Nicolas Wotschke –  Deputy project manager

 

Effective management was key to the program

Hundreds of elements of a range of sizes, types and specifications were necessary for the cable-net structure, and with the associated volume of paperwork related to quality control procedures, it was clear that effective management would be key to the program. The team brainstormed the process to map out what capabilities they would need from a digital tool, and subsequently worked with sister company Sixense to build on its existing Digitalsite system with this in mind.

The main requirements were to have a tablet-based data control system through which users could access up-to-date information direct from the BIM model and understand how each cable-net element fitted in the global system via a 3D viewer; fill in control sheets and submit them for approval; identify components using a QR code and check that they matched the necessary specs and requirements; submit and follow-up non conformance reports; all in a paperless environment.

  • 200
    Number of Hyend Open Spelter sockets
  • 213
    Span of cable-net structure (m)
  • 1,174
    Clamps
  • 100k+
    Bolts

Cable roof stadium track and trace

Freyssinet and its partner Sixense spent several months developing the digital tool and user interface ahead of work starting on site. The main benefits were that it enabled traceability of all information – both that which was sent to site and the as-built data that was returned; the tablet was light and portable for use on site; it eliminated the use of printed copies; and the 3D viewer enabled operatives to easily understand the assembly of a very complex structure. Non-conformance reports were much easier to resolve as they could accompanied by photos of the relevant product, eliminating potential problems with translation when suppliers were overseas.

The digital tool improved productivity and quality control, cutting down on the time taken to submit and resolve problems and creating traceability and proper documentation. This pilot project has the potential to be developed further, building on feedback from its successful use on the Allegiant Stadium.

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