Conco was selected to perform a dome roof metal deck fill with shotcrete. The project required a unique application of approximately 6,000 cubic yards of shotcrete that had to be pumped over 300 feet. While Conco does not currently operate in Nevada, Conco was the only contractor that was able to provide solutions with a job-specific plan including pumping, shotcrete/place, and finish sequence, and access-egress to perform the scope of work.
MSG Sphere is the first of its kind. The building consists of a sphere-shaped amphitheater that will feature nearly 20,000 seats. The interior of the building will be completely wrapped with over 13,500 high-resolution LED screens. As the building itself, Conco provided a unique dome roof fill with shotcrete application. Conco coordinated manpower from all the regions to work together and complete such a complex project.
The first challenge that Conco had to face, was to provide a complete pumping plan to push over 6,000 cubic yards over 300 ft vertically plus another 100 feet horizontally at each pump system location. The plan included engineering, calculations of maximum pressure of the system, and the rate of yardage per hour required to meet the project expectations. A total of (3) complex pump systems were installed, utilizing high-pressure pumps at ground level that fed trailer pumps installed on the roof through hard pipes. Finally, a combination of pipes and rubber hoses were used from the upper pumps to place the whole dome.
The second challenge was to tailor and create shotcrete and cast-in-place mix design that can meet a specified 0.02% shrinkage requirement on the whole dome. Conco worked hand in hand with a local Ready-Mix Supplier (Silverstar Ready Mix) performing multiple trial batches, adjusting aggregates sources and multiple admixtures dosages until it was achieved.
The structural engineer required the dome to be placed in dome shape form starting from the crown of the dome. Every day the placement had to be completed around the whole circumference of the dome for the structure be able settled evenly with the added weight of the concrete. Conco planned a construction joint sequence with the following parameters:
▪ Being able to place a total circumference on a daily basis to meet the engineer’s requirement.
▪ Achieve an optimum rate of yardage per hour on daily basis with three crews running simultaneously at every pump location.
▪ Coordination with ready mix supplier on the concrete delivery rate.
▪ Complete the fill of the whole dome in 23 days or less as required on the project schedule.
▪ Conco had to fully coordinate every single step of the work with other trades to avoid project delays.
▪ Planned a scaffold system that was easy enough to be able to be moved on a daily basis but strong enough to support crews on a safely manner.
▪ Provided easy access-egress on areas of the dome that were up to 50-degree incline.
The Enso Village Project is a new 220-unit senior independent living facility that promotes mindful aging through the joys of environmental stewardship and appreciation of nature. It’s also the first senior living startup to be approved for “Green Bonds,” which distinguishes the project as a sustainable investment.
Conco will be servicing the concrete pumping, concrete reinforcement, concrete formwork, concrete finishing, shotcrete, and Confoam services. Throughout the duration of the build process, Conco expects to place 17,000 cubic yards of concrete, shotcrete, and Confoam, including 2,800,000 pounds of rebar and post tension reinforcement.
This environmentally-conscious community will contain studios, 2-bedroom units, 24 memory care units, and 30 assisted living units. Its amenities include a community room, bistro, maker studio, salon, physical therapy clinic, guestroom, tearoom, clubroom, mail room, and wellness center. This includes a 4-level dwelling, with 1 subgrade level of 289 parking stalls for tenants only.
Conco is excited to help create this Zen-inspired community, providing a thoughtful home for its future residents. It is expected to be completed in 2023.
Conco is partnering with Clark Construction to create the Block 34 Mission Bay Parking Garage, a 9-level parking structure for the UCSF Medical Center Campus in San Francisco, CA. Conco’s services include concrete pumping, concrete reinforcement, concrete formwork, concrete finishing, and shotcrete.
The garage will be located at the corner of Mariposa Street and 3rd Street, and designed to be as visually open as possible, allowing for higher security and easier wayfinding. It will provide 500 total parking stalls, with 371 for public and campus access, 34 accessible stalls, 31 charging stations, 48 bicycle units, and 16 motorcycle stalls. It will also have an attached Transportation Department Administration Office.
With an estimated opening day of August 2022, the garage will have about 8,600 cubic yards of concrete and shotcrete, and 2,400,000 pounds of rebar and post tension reinforcement. When viewed from a pedestrian scale, the garage will knit together with the surrounding campus buildings and neighborhood, creating a seamless addition to UCSF.