Southern California Archives | The Conco Companies

This four-story medical office building in Pasadena will also contain 3 levels of subterranean parking. The structure will be comprised of structural slabs up to ground level, as well as metal deck slabs and a steel structure above.

VE & ConFoam

As part of our VE efforts, Conco eliminated the gravel beneath the SOG and will utilize the excavated and recompacted native material, as was consistent with allowable methods identified by the soils report. This not only produced a substantial savings to the project owner, but also eliminated the need to off-haul and dispose of hundreds of yards of useful soil.

In addition, deep sewer ejector and sump pits had massive footprints for their benched excavations. We elected to use ConFoam to backfill around these pits, which produced a substantial time savings to the operation as well as allowed for simple future utility installations within the footprint.

Conco is working on a 4 story performing arts center that includes a subterranean basement which is encased by cast in place walls that support the steel structure above. With a start date of Nov. 21, 2022, this project is expected to wrap up by October 1, 2023.

Project – Mixed use: affordable housing and commercial space for medical offices and a grocery market. The unique name is a reference to the A 1 Eastern Homemade Pickle Company, which was a long-time occupant at the development site.

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 Conco Companies began construction on the new 100,000 SF Mt. San Antonio College (SAC) Student Center on December 10, 2020. The original center opened in 1953 on a much smaller campus and needs to be expanded and updated for Mt. SAC’s current needs. Conco is providing a multitude of concrete services including but not limited to formwork, shoring, pumping, and rebar fabrication. Working alongside Conco are the general contractor Tilden-Coil (CM), HPI Architecture, and MHP Structural Engineers.

Conco came out on top of a competitive bid process. Our approach varied drastically from that of CM. Our understanding of how to sequence the footings and tie the second-level elevated slabs into the slab on grade at level 2 were key factors in meeting an aggressive schedule. Since then we’ve proven our efforts, and have been requested for opinions on future projects that the CM is undertaking.

When open, the Mt. SAC Student Center will welcome students into an inclusive and comfortable environment that fosters student engagement. The first floor will have a convenience store and added study spots for individual students and groups. The second floor will feature a multi-cultural center, student club kitchen, and an updated room for Associated Student meetings. On all three floors will be event space and conference rooms.

Planned for substantial completion by December 22, 2021, Conco is excited to provide a much-needed space to support education and build a stronger future.