Bay Area Archives | Page 6 of 7 | The Conco Companies

After the highly publicized reports from this past summer regarding the failure of 32 anchor rods on the eastern span of the new Bay Bridge, the highly regarded concrete contractor, Conco was retained by the general contractor, American Bridge/Fluor Enterprises, Inc. JV, to assist with the repair work. Based on their earlier performance with other critical and technically challenging components of the new bridge structure, Conco was the logical choice. “Every aspect of this project had complex technical challenges.” said Brian Petersen, the contractor’s Project Director, and “Conco’s skill and expertise was a great asset to our team.”

The defective anchor rods were supposed to secure the bridge deck to the concrete crossbeam support. Since the failed rods were embedded and inaccessible, replacement was not feasible. After extensive collaboration and analysis, a fix was designed. It involved a complex series of steel saddles and post-tensioned (PT) jacket walls that would provide the required clamping force to secure the bridge deck framing to the E2 crossbeam. Temporary steel shims were inserted into the stabilizers while the repairs were being done, and in order for the Labor Day opening to go forward as planned. “The SAS bridge is part of a world-class megaproject which features a large amount of challenging concrete work associated with temporary support structures that are not part of the completed bridge,” noted Jim Klinger, Conco’s project manager.

For this very complicated problem, Conco’s first task was to close in a steel-framed trestle platform to give work crews access to the site and eliminate the potential for materials to fall into the San Francisco Bay. Once the platform was complete, crews roughened the crossbeam surface and epoxied over 3,000 drilled dowels into place. Reinforcing steel and PT cable ducts were then installed by Harris Salinas. Conco crews followed behind them, placing custom-made PT trumpet blockouts and setting forms for the jacket walls.

The concrete jacket wall structures were placed in three pours totaling 380 cubic yards. Due to restricted access and rebar congestion, much of the concrete had to be pumped 250 feet and then injected into the forms through ports at strategic locations. Conco worked closely with concrete supplier, Central Concrete, to develop an injectable SCC mix with silica fume that would meet the project’s specifications. A full-scale mockup was constructed and successfully tested to ensure the long-distance pumping and injection of the highly-flowable SCC mix would work.

“Almost all of the concrete work items Conco was asked to perform by ABFJV were custom, one-of-a-kind scopes that we will probably never see again,” said Klinger. In late November, the third and final injection was finished and the repairs were completed successfully.

Conco is a leading supplier of concrete services for the Western United States. As one of the leading commercial concrete contractors in the Bay Area, we have been involved with large-scale projects in the area including the new 49ers Stadium. Our concrete services include commercial, educational, parking and other construction development as well as public works projects and highways.

Conco is once again an essential part of a team that is constructing the new Kaiser San Leandro Medical Center by providing concrete services. The facility is scheduled to open this year. The overall project consists of 740,000 sq. ft. of new construction, which includes a six-story, 436,000 sq. ft. hospital with 264 licensed, acute-care beds. The Medical Center will also have a new central 30,000 sq. ft. utility plant to house the mechanical and electrical equipment.

The plan calls for an abundance of surface parking for up to 2,100 vehicles, and a 275,000 sq. ft. Hospital Support Building that is connected to the main hospital. The 63 acre lot is located just off the freeway, which makes it highly accessible, and the new Center will be a replacement for the old Kaiser Hayward Hospital. Since the new construction covers only 30 acres, there is plenty of opportunity to showcase the scenic rolling hills on the property.

This is Kaiser’s eighth template hospital, and while it is still constructed to be site-specific, it reduces building costs by approximately $89 less per sq. ft. The project is designed by Hawley Peterson & Snyder in association with AECOM partner, Ellerbe Becket. The general contractor for the Medical Center is Rudolph & Sletton, Inc. and the engineer is Rutherford & Chekene. This is Rudolph & Sletton’s third hospital project they have worked on with Kaiser over the last few years. According to their website, “This ‘second generation’ template hospital, which reflects Kaiser Permanente’s program to establish standardized, yet customizable, state-of-the-art models for design and construction of its hospitals, includes the latest technology for patient care and support.”

Conco performed all of the structural concrete work for the project and belted and placed more than 18,000 tons of aggregate underslab material. In addition, the project incorporated sustainable design features based on the Green Guide for Healthcare as well as environmentally responsible purchasing. A prime example is during the demolition of the old building on the property; close to 97% of all waste was recycled on-site including grinding up old concrete. It was used in the soil mixture process and for fill and pavement base. It is estimated that 98,000 tons of construction waste material was diverted from landfills.

Conco is a leading supplier of concrete services for the Western United States. We got our start in the Bay Area in 1959 by offering clients the best value on a wide range of concrete services and products. Since that time, we have steadily taken a leading role as one of the Bay Area’s top concrete contractors. Our concrete services include commercial, educational, parking and other construction development as well as public works projects and highways.

The former Riverside Continuation High School not only has a brand new building, but it also has a new name. As part of the Pittsburg Unified School District in Pittsburg, CA, the new Black Diamond High School opened its doors to students in time for the start of the new 2012 school year. It is an alternative school that serves students in grades 9-12 that are ages 16 to 18 years old.

The old Riverside High School building was in a deteriorated state when the decision was made to totally replace the structure with a new 34,000 sq. ft. state-of-the-art facility. The contractor for the project was Broward Builders, Inc. and the architect was California Design West. The building was engineered by Buehler and Buehler Structural Engineers. Conco was brought in to provide concrete services on the new structure.

The project was completed in slightly under a year from the groundbreaking in August of 2011. The construction team worked diligently throughout the project to effectively meet all timelines and to stay on budget. According to California Design West, the new campus features a steel framed building and walls that are a brick/CMU veneer. There is a large, enclosed courtyard tastefully landscaped and clerestory windows in the breezeway.

In total, the building has 19 general classrooms and two special education rooms, an up-to-date media center, and a large multipurpose/cafeteria complete with a prep kitchen. Furthermore the new school was provided with a designated area for a child development program with its own outdoor playground. Conco recognizes that while this was not one of our large-sized or well-known projects, we are proud of our continued commitment to provide exemplary concrete services that enhance and benefit our communities.

Conco’s team of professional concrete contractors in the Portland area brings the highest level of integrity and principles to each project from pre-construction to finish. With the rapidly growing construction market, Conco is taking an active role in the Portland area with our expansion of high-quality commercial concrete services.

While we have built our reputation on concrete work for large-sized and notable projects, we have also been a part of smaller jobs that are just as important to those who benefit. A commuter bike connection was sorely needed to link two major roads in Novato, CA. to give bike riders a safe alternative to riding along the side of a very busy freeway.

Opened in Dec of 2011, the beautiful Enfrente Pathway is a 0.6-mile, multi-use trail that is completely separated from cars and provides a critical link to central and south Novato. The project was made possible by a grant of $1.95 million from the federal government and is a part of the Non-Motorized Transportation Pilot Program for Marin County. The contractor was Ghilotti Construction and the engineer was SOHA Engineers.

Conco’s expert concrete services were used to help with the construction of the path. The project required installation of soil nails used to retain the hillside. Sculpted shotcrete was applied as a finish over the soil nail walls. Once the walls were constructed, the area was graded in preparation for the paving of the concrete pathway. A concrete retaining wall was constructed at one end of the project and a concrete barrier was built at the other end. For added safety, fencing was also put up along the path.

Now that the connector is complete and offers a safer route, the hope is that more cyclists will opt to ride to work, which will help to reduce traffic and create less greenhouse gas emissions. Conco is pleased to have been a part of a project that enhances the lives of those in the Novato area and helps to keep cyclists and pedestrians safe.

Conco is one of the leading concrete contractors in San Francisco offering a range of innovative, quality services. We have been honored to work on many high-profile projects and were recently awarded the concrete package for the San Francisco 49ers Stadium. Our concrete services include commercial, educational, parking and other construction development as well as public works projects.

Several years ago Conco provided concrete services for United Spiral Pipe to help build a new state-of-the-art spiral welded pipe manufacturing plant in Pittsburg, Calif. United Spiral Pipe LLC (USP) is a joint venture of United States Steel Corporation and two South Korean firms, the steelmaker Posco and SeAH, a spiral steel pipe manufacturer.

The USP facility broke ground in February, 2008 and started commercial production in January, 2010. It is estimated that over 320,000 hours of building and construction trade labor was used in the project. The plant is one of the most advanced and efficient spiral pipe mills in North America to-date with an overall cost of $130 million. It was constructed to LEED standards and exceeds California’s Title 24 lighting requirements. The architect and engineer on the project was the Continental Design And Management Group.

USP is a great addition to the city of Pittsburg as well as the whole Bay Area community. When the plant first opened, it provided 120 new, full-time manufacturing jobs. That was a good step in the right direction for an area that they had been losing manufacturing jobs.

The size of the new facility is enormous. The rectangular shaped building is 35 ft. tall, more than six city blocks long, and approximately a block and a half wide. According to the USP website the “new plant will have world-class pipe making and coating facilities and be capable of producing 300,000 net tons of API specification line pipe per year in outside diameters ranging from 24 inches to 64 inches.” The massive steel pipes are used to transport oil and natural gas for the expanding North America pipe market.

Discover the experience of working with one of the top professional commercial concrete contractors in the Colorado Springs area. Conco has been in business since 1959 delivering first-rate concrete services and has all the experience and expertise to handle even the most challenging projects.

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