The Conco Companies recently completed all structural concrete renovations for the LA Memorial Coliseum Renovation Project. Conco’s services included finishing, formwork,pumping, and shotcrete.
The Los Angeles Memorial Coliseum underwent the largest renovation in its 100-year history. Newly named, United Airlines Field at the Los Angeles Memorial Coliseum, the $315 million makeover will host the University of Southern California (USC) Trojans, LA Rams football teams and prepare for the 2028 Olympic Games in Los Angeles.
The Conco Companies placed approximately 24,000 cubic yards of concrete, including mat foundations, slab over metal decks,structural decks, shotcrete and new concrete seating in a large portion of the stadium bowl.
The whole north and south concrete seating bowl was replaced in order to add wider seats, more legroom, and extra aisles. Additionally, an eight-story structure was built to house new press boxes and luxury suites. A specially designed concrete mix was poured to protect reinforcing. This was necessary due to the concrete exposure to the environment. Concrete Admixtures were used for corrosion inhibitors and waterproofing.
Like every high-profile project, theLos Angeles Memorial Coliseumpresented its own challenges. Conco’s planning and execution skills were tested by some of these challenges, such as:
Swiftly installing high quality, unique formwork systems with tight radius and slope seating.
Rigorous schedules to perform the work without impacting the 2018-2019 football season of both USC Trojans and LA Rams.
The Conco Companies was selected based on our vast stadium experience and multiple concrete services. Conco successfully completed the job on schedule and meeting the client’s expectations.
Conco is one of the foremost suppliers of concrete services for the Western U.S. We got our start in 1959 in the Bay Area by offering clients the best value on a broad range of concrete services and products. Since that time, we have taken a leading role as top concrete contractors in the region. We have regional offices serving California, Oregon, Nevada, Colorado and Washington.
The Conco Companies topped off the new mid-rise Epic Tower in February 2019. Conco provided all cast-in-place concrete services, including finishing, formwork, pumping and shotcrete.
Developed by Hudson Pacific Properties and designed Gensler Architects and Nabih Yousef and Associates, the project, under Hathaway Dinwiddie features a 14-story tower with 300,000 square feet of office space, 18,400 square feet of new retail space, and 5 levels of structured parking. The $150 million-dollar development will be an expansion to the Sunset Bronson Studios Complex directly across the street.
The unique building includes terraces at every level with modern appearance landscapes, providing a seamless transition to outside workspaces through tall glass walls that overlook the city of Los Angeles. Office space features new 15-foot lower profile ceilings with open floorplans.
The project started in December 2017 and presented logistic challenges due to its location, high volume of traffic, and limited site access. Epic Tower took nearly 43,000 cubic yards (cy) of concrete to be completed. A total of 11,000 cy was poured on footings and 12-foot mat slabs surrounding the concrete core. The methods used to place mass concrete had to be taken into consideration with thermal control plans. Vertical elements on the structure such as columns and the concrete core tower required a 7,000 PSI and a high modulus of elasticity (MOE).
To overcome these challenges, Catalina Pacific provided a mix design using Orca rock and provided a mix that would reach nearly 9,000 PSI at 56 days. The concrete decks which comprised 50% of the overall yardage of the project, also had high requirements on MOE and Orca rock with a 6,000 PSI requirement. Additional challenges included a 10-foot cantilever deck, which was completed successfully by our formwork team.
Conco was selected for this project because of our experience and commitment to high-quality planning and execution on complex projects.
Conco is one of the foremost suppliers of concrete services for the Western U.S. We got our start in 1959 in the Bay Area by offering clients the best value on a broad range of concrete services and products. Since that time, we have taken a leading role as top concrete contractors in the region. We have regional offices serving California, Oregon, Nevada, Colorado and Washington.
Saturday, August 24th was not your typical day for Conco. While many projects are shutdown for the weekend, this Saturday was one of the busiest Saturdays in Conco’s 60-year history.
The activity began Friday evening in Southern California. Starting at 9:30 PM, Conco began to pump, place, and finish 10,400 cubic yards in downtown Los Angeles on a project known as The Grand. The Grand is a mixed-use project with retail, residential and a hotel across the street from the Disney Concert Hall. The developers for The Grand are The Related Cos. and CORE USA for this Frank Gehry designed structure.
The Grand Concrete Pour
The Grand 10,400 concrete pour was the second of three foundation pours for the structure. Eight concrete pumps were positioned around the foundation to receive concrete at the scheduled delivery rate of 750 cubic yards per hour. In order to supply concrete at this rate, Calportland, with the assistance of Associated Concrete, utilized five batch plants and over 120 concrete mixer trucks.
In addition to the work performed on The Grand, Conco had another large concrete pour on this day in downtown Oakland, CA. Working for the Holland Partner Group, the project located at 24th & Harrison, site of the old Acura dealership, will comprise of luxury apartments with retail and other amenities.
Before placing the concrete, Conco was responsible for fabricating and installing all the rebar. Comprised of mainly #11 bar, more than 4.1 million pounds were needed for the entire mat foundation.
24th & Harrison Concrete Pour
The 24th & Harrison project by the Holland Group was the second of two foundation pours at the site, requiring 7,300 cubic yards of concrete supplied by Central Concrete out of five concrete batch plants. Prior to pouring the concrete, Conco provided the fabricated rebar and installation. The challenging site necessitated that six concrete pumps (five were active at any given time) be used with a scheduled delivery rate of 600 cubic yards per hour being delivered by 120 concrete mixer trucks. The concrete pour began at 1:00 AM.
950 Market Street Concrete Pour
Furthermore, in addition to the Los Angeles and Oakland pours, a mat foundation pour also took place simultaneously in San Francisco, CA. The project at 950 Market Street will be a mixed-use development consisting of housing, a hotel, retail, and a dedicated non-profit space. This project is being developed by Group i, a San Francisco-based real estate development company. Working for the general contractor, Pankow Builders, Conco also fabricated and installed the rebar for the foundation. More than 1.7 million pounds were needed to be put in place prior to concrete placement for the entire foundation.
The mat pour for the 950 Market Street project was the first of two for the site and was supplied by CEMEX out of three concrete plants. A total of 3,195 yards of concrete was pumped, placed and finished by Conco through three concrete pumps that were supplied at a scheduled rate of 300 cubic yards per hour.
For the activity in three separate markets to transpire, multiple internal and external meetings were held to discuss every facet of activity associated with making each concrete pour a success. For Conco, success comes from developing the proper plan and executing that plan. Items such as safety, concrete mix designs, pump placement, street closures, individual company responsibilities, and contingencies are just a few of the details that must seamlessly be ironed out.
The resources that were used and vital statistics for Saturday, August 24, 2019 were:
The Grand
Los Angeles
24 & Harrison
Oakland
950 Market
San Francisco
Total
Concrete Placed
10,400
7,300
3,195
20,895
Concrete YPH Placed
750
600
300
1,650
Square Feet Finished
41,000
44,800
18,000
103,800
Mixer Trucks Used
120
140
60
220
With the combined effort of Conco, our customers and suppliers, all three projects finished on time with only 5 extra yards of concrete for all three projects combined. More importantly, all were completed without so much as a first aid claim.
Large mat foundation pours require extensive planning and collaboration with customers, suppliers, public agencies and various other third parties. Conco’s success is dependent on everyone doing their part and we at Conco are thankful to work with great customers and suppliers day in and day out, who give us the opportunity to succeed.
By 2020-21, Los Angelinos will have access to a large portion of its newest multi-use development project in the Inglewood neighborhood of the city: Hollywood Park. Since its conception, the expansive 300-acre campus has brought together the city’s best designers, developers, and commercial concrete contractors in Los Angeles. Now, Hollywood Park continues to add world-class amenities to its site and boasts an impressive array of attractions. Once completed, the development will have a total of 2,500 homes, 500,000 square feet of retail space, a 6,000 seat concert venue, over 900,000 square feet of office space, 300 hotel rooms, 25 acres of parks, 12 miles of walkable paths, and the new LA Stadium for the Rams and Chargers with 70,000 seats.
Stylish, Class A Office Space
The most recent project to begin construction in the ambitious development is the NFL Media Building. This eight-story high rise tower commenced construction in summer of 2019 and will include a connected two-story studio support facility and an adjacent studio structure to become the headquarters of the West Coast NFL Operations and Media. Slated to welcome tenants in summer of 2021, the project will provide 434,000 square feet of office space, 220,000 square feet of which will be available to lease for companies outside of NFL Operations and Media. Given the large scale and fast timeline of the project, the general contractors Pankow Builders selected the Conco Companies to provide commercial concrete contractor services.
Reliable, Quality Concrete Services
Conco was chosen for their ability to meet the project’s unique requirements, particularly the large amount of quality concrete finishing on a very accelerated schedule. Conco began work on the project in July 2019 and is expected to finish in September 2020. Within this fast turnaround, Conco will provide concrete pumping, placement, and finishing on all slab on grade and structural decks, including a studio level with stringently high tolerances for floor flatness and floor levelness.
Meeting Strict Standards
Floor flatness and floor levelness are indicated by an F-number, which is a quantitative way to indicate the flatness and levelness of a concrete floor. The F-number is an important metric for floors with random traffic patterns, as with the studio level of the NFL Media Building. For both measures, a high F-number is desired, and in particular, a high F-number for floor flatness is a result of a skilled concrete finisher working the surface of the concrete to achieve a flat floor. Conco’s reputation for quality concrete work ensures that the strict standards for the NFL Media Building will be met, while still keeping the project on time and on budget.
Hire Local
A significant part of this project is the local hire requirements. On June 26, 2019, The Conco Companies partnered with Pankow Builders, America’s Job Center and the Southern California Unions-Carpenters and Laborers among other entities at a Jobs Information & Resource Fair in Inglewood. Together we introduced local residents to the construction industry and the upcoming job opportunities.
Local residents were informed of the various projects. They were also informed of the different trades we work with at Conco as well as the process of becoming employed.
Superintendent Carlos Ambriz, Project Manager Nestor Miranda, Dispatcher Michael Calderon, and office Manager Dora Veronica were in attendance.
The Conco Companies’ mission is to be the best supplier of concrete services in the Western U.S. and to bring expertise and incomparable quality to each project. We continue to upgrade and expand our facilities to better serve the growing market for commercial, educational, parking structures, public works projects, and other development. Contact us to learn more about the services from one of the most trusted concrete contractors in Los Angeles.
The Grand is an immense, much anticipated mixed-use development project in the Los Angeles neighborhood of Bunker Hill that commenced construction in May 2019. To kick off the project, Los Angeles commercial concrete contractors, The Conco Companies delivered an impressive demonstration of its skills and expertise. For the first of the two towers to be erected for the project, Conco provided the second-largest continuous casting of a foundation in Los Angeles in a mere 15 hours. The project with the top honors in this category and the recipient of Guinness World Record recognition in 2014 was the Wilshire Grand Center, also completed by Conco.
The metrics for the foundation mat pour of this 39-story residential tower designed by Frank Gehry are staggering: 140 skilled Conco employees placed 13,275 cubic yards of concrete at an approximate rate of 1,000 cubic yards per hour. The 39,303 square foot concrete mat varies in thickness from 6 feet to 12 feet and weighs roughly 27,000 tons. Throughout the 15-hour mat pour, eight state-of-the-art concrete pumps worked to pump and place the concrete while 1,348 truck trips to six batch plants were completed.
In addition to the speed of its service delivery and the seamless coordination with multiple stakeholders such as developer Related Companies, the Los Angeles City Council, and the Department of Transportation, Conco also achieved the feat of zero injuries during this first phase of the project. Conco prides itself on prioritizing job site safety, and true to Conco’s focus, despite the dizzying speed of the mat pour, there were no injuries. The experience and expertise behind Conco’s reputation as the top supplier of commercial concrete services – no matter the scale or difficulty of the project – was certainly on full display during this massive mat pour.
The Conco Companies’ mission is to be the best supplier of concrete services in the Western U.S. and to bring expertise and incomparable quality to each project. We continue to upgrade and expand our facilities to better serve the growing market for commercial, educational, parking structures, public works projects, and other development. Contact us to learn more about the services from one of the most trusted concrete contractors in Los Angeles.
