Since the passage of Ordinance 183893 in 2015, the City of Los Angeles has been busy identifying non-ductile concrete buildings that require seismic retrofitting to come up code. Along with all of the other concrete services we provide, The Conco Companies is providing professional seismic retrofitting for pre-1978 non-ductile concrete buildings in L.A.
Utilizing our extensive experience, we have the expertise to strengthen concrete buildings to improve their safety and integrity as well as to preserve the historic or unique design elements of the building. Our portfolio includes several renowned area projects including the 1920s-era L.A. Hall of Justice, the iconic L.A. City Hall and the historic Rose Bowl Stadium. The goal of seismic retrofitting is to reduce structural deficiencies and improve the performance of the targeted non-ductile concrete buildings in the event of an earthquake. Without proper strengthening, these buildings may experience structural failure during and/or after seismic activity. In the case of the award-winning concrete seismic retrofit of Los Angeles’ City Hall, the project required 30,000 cubic yards of concrete, 3,000 tons of structural steel, and 5,000 tons of reinforcing steel. Part of the project included providing reinforced concrete shear walls to strengthen existing masonry walls. Another seismic retrofit and renovation we were proud to be involved with was the $231-million L.A. Hall of Justice project. The building had been extensively damaged in the 1994 Northridge earthquake. During the project, we utilized cost-effective solutions including using shotcrete to construct walls faster and with less material to save both time and money. To ensure the best outcome as well as to minimalize the costs, seismic retrofitting projects require experience as well as innovative thinking and Conco delivers plenty of both to all of our projects. In addition to being one of California’s top commercial concrete contractors, we have over sixty years of experience in the industry. Trust Conco’s expertise to help bring your pre-1978 non-ductile concrete building up to code. Please contact us to learn more. The Conco Companies are 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.
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At The Conco Companies, our portfolio includes a wide variety of projects that have required the use of various concrete mixes to meet their unique specifications. For projects that require extremely durable and/or high-strength concrete, High-performance Concrete (HPC) is used.
HPC is defined by the American Concrete Institute (ACI) as “meeting special combinations of performance and uniformity requirements that cannot always be achieved routinely using conventional constituents and normal mixing, placing, and curing practices.” The design mix of HPC basically contains the same materials as conventional concrete with the difference being the proportion of the materials added to provide the needed strength and durability. The ACI explains that HPC has a specified compressive strength of 8000 psi (55 MPa) or greater. They add that, “The value of 8000 psi (55 MPa) was selected because it represented a strength level at which special care is required for production and testing of the concrete and at which special structural design requirements may be needed.” In addition to strength requirements, HPC is used in projects that face tough environmental conditions. To achieve a project’s specifications, HPC uses other materials along with the cement such as flyash, ground blast furnace slag or microsilica fume. The characteristics of HPC include low shrinkage, low permeability, a high modulus of elasticity, and high strength. However not all high-strength concrete is high-performance. The HPC used in the construction of bridge decks and highways must contain properties such as high density, low permeability and resistance to environmental conditions. Other projects that benefit from HPC are the columns used in high-rises, especially the ones on the lower floors that will bear the greatest load, shear walls and foundations. Please visit Conco’s website to see some of our impressive projects we have had the honor to be a part of. Also while you are there, take a look at the wide range of premium concrete services we offer. The Conco Companies are a leading supplier of concrete services for the Western U.S. 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 taken a leading role as one of the top concrete contractors in the region. We have four regional offices serving California, Nevada, Washington, Oregon and Colorado. Sources:concrete.org/topicsinconcrete/topicdetail/high%20performance%20concrete The concrete industry produces approximately 10 billion tons of concrete worldwide. In the U.S. the industry has an annual production of 500 million tons with an estimated value of $35 billion and employs more than 2 million employees. It is suggested that with the amount of the U.S.’s yearly production that it equals to about two tons for every man, woman and child. To produce these types of volumes, it requires vast amounts of natural resources to supply the aggregate needed as well as to make the cement. Concrete is used to build highways, streets and bridges, commercial, industrial, medical and educational structures, residential housing and other construction markets.
The National Ready Mixed Concrete Association (NRMCA) reports that there is an estimated 5,500 ready mixed concrete plants located throughout the country. They also report that the industry has around 55,000 ready mixed concrete mixer trucks that are used to deliver the material to the jobsite. It is critical to the success of the placement of the concrete to have plants located close to urban areas as well as to rural locations as the material needs to be delivered to the site in a timely manner. This means that concrete production facilities are typically located “within 60 to 90 minutes travelling distance from any construction project.” It is also interesting to note that approximately 75% of the cement shipped to the U.S. is used by the ready mixed concrete industry. In addition to the portland cement, concrete may also contain industrial byproducts such as fly ash derived from coal burning power plants and slag from the manufacturing of iron. Silica fume, a byproduct of the silicon and ferrosilicon alloy production, is used as a pozzolanic material for high performance concrete. The Conco Companies are one of the leading concrete contractors in the Western U.S. and offer a wide range of quality services and products. Our experience includes providing services for commercial, educational, parking and other construction development as well as public works projects. We serve California, Washington State, Oregon, Colorado and Nevada. Sources: nrmca.org/concrete/data.asp columbia.edu/cu/civileng/meyer/publications/publications/83%20Concrete%20Materials%20and%20Sustainable%20Development.pdf The Conco Companies have an impressive fleet of modern, state-of-the-art concrete pumps in addition to Telebelts. We use this equipment to help us complete projects faster and more efficiently for our customers.
One of our more recent additions to our fleet is a couple of Telebelt® TB 105 Telescopic Belt Conveyors that are available from our Southern California and Washington State locations. The Telebelt is a versatile tool that can be used to convey a wide variety of materials ranging from sand all the way to 4-inch rock. It has an operating capacity of up to 360 cubic yards per hour and provides a cost-effective alternative to transporting materials with a crane and skid-steer. The belt conveyors can eliminate the labor-intensive process of having to re-handle the material and are ideal in congested jobsites with uneven, muddy ground. They can also be the solution in areas with low clearances or a tight access point as well as a job that requires material to be deposited below grade. Conco uses our Telebelts to assist with mat pours, large foundations and footings, and backfill. The 105 Telescopic Belt Conveyors come with a variety of hopper options and have a horizontal reach of 105 ft. and an 18” conveyor belt width. They can handle concrete from 0” to 12” slumps and can be setup and operated under heights as low as 16 ft. In addition to transporting concrete, the belt conveyors are used to transport rock, gravel, backfill and other materials. Our Telebelt® TB 110 offers many of the same benefits as the 105 Telescopic Belt Conveyors but with a capability of 5 cubic yards per minute. It too has an easy setup even in congested areas or rough terrain. Please visit our website for more information and specifications on our Telescope Belt Conveyors along with our concrete pumps. The Conco Companies are 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 four regional offices serving California, Oregon, Nevada, Colorado and Washington. An interesting report from the Portland Cement Association (PCA) illustrates the various uses for portland cement as it is one of the key ingredients in concrete. They suggest that while concrete is very important to the way we live, and in fact surrounds us, it is often overlooked. They explain that concrete “makes our homes and offices durable and more resilient in natural disasters, it makes our roads and bridges strong and last longer, and thanks to its permanence and energy efficiency, it helps sustain our environment.”
From their illustration, the PCA’s breakdown of how concrete is used includes 8.4% on water and waste systems, 8.9% for industrial and commercial buildings, 27.5% on one-and-two family houses, and 30.8% on the construction of highways, streets and bridges. The other 22.1% is used to build offices, hotels, hospitals, religious institutions, educational institutions and public utilities. Concrete is a mixture of cement paste (cement and water) and coarse and/or fine aggregate. Almost all modern cement is portland cement, which was patented in 1824 by the Englishman, Joseph Aspdin, who named it for its similarity to a building stone quarried on the Isle of Portland. The PCA also describes the various components of concrete as containing 7 to 15% cement, 14 to 21% water, 60 to 75% of aggregate and as much as 8% of air. At The Conco Companies, we have been involved in a wide range of projects from towering skyscrapers, to mixed-use high-rises, hospitals, educational, public utilities and parking structure projects. Conco Pumping is one of the largest pumping and belting companies in the United States and has a reputation for delivering first-class concrete pumping services since 1975. At Conco Reinforcing, we own and operate two state-of-the-art facilities that give us the resources to be a single source for all your rebar fabrication and installation needs regardless of the project size. Please visit our website to learn more about the various concrete services offered by Conco. Conco is one of the leading concrete contractors in the Western U.S. and offer a wide range of quality services and products. Our experience includes providing services for commercial, educational, parking and other construction development as well as public works projects. We serve California, Washington State, Oregon, Colorado and Nevada. Source: cement.org/civilization At The Conco Companies, we have a long history of adopting the latest concrete technologies as well as purchasing the latest state-of-the-art equipment to provide our customers with the best range of options for their project. One of the types of pumps that we find are very beneficial in projects with challenging placement specifications is our articulating boom pumps.
Also known as roll-and-fold or Z-fold, articulating boom pumps are available in four-section multi-Z booms or five-section Z-Fold booms and provide us with lots of versatility and a large working range. The pump is it a good choice for hard-to-reach areas or when you need the ease of their maneuverability. In addition to providing a good vertical reach, articulating booms are very easy to transport as they fold into a compact size. At all of our pumping locations, we have a Putzmeister 28Z, which is the perfect example of the versatility of a four-section Multi-Z boom. Its compact size and great flexibility makes it a great choice for congested job sites. Features include the smallest front outrigger footprint of all models in its class, a smooth concrete flow, and a vertical reach of 89 feet 7 inches. Also since the 28Z does not need a large vertical clearance to unfold, it can be set up and used inside of a building. The versatility of the multi-Z’s configuration does not require the boom to be fully extended in order to pump; and as the longer, straighter pipe allows for a less stressful concrete flow, it can result in better wear on parts. The Putzmeister 28Z is also adaptable to a variety of material. Please visit our website to see our full list of concrete pumps and Telebelts that are available at each of our Southern California, Northern California and Washington State locations. The Conco Companies are a leading supplier of concrete services for the Western U.S. and 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 taken a leading role as one of the top concrete contractors in the region. We currently serve California, Washington, Oregon, Nevada and Colorado. Recently The Conco Companies announced the topping out of the East County Detention Center, a 500,000 SF expansion and replacement to the existing Riverside County Jail. The project’s General Contractor is Clark Construction and the architect is HOK. The $330 million project will add another 1,626 beds to the facility once it is complete.
Since the jail is located in Indio, CA, one of the most challenging aspects to the job was safely dealing with an average temperature of around 100°F and sometimes reaching as high as 120°F. To ensure the safety of all the workers, we had a full-time safety manager on site. Furthermore, all Conco employees as well as our subcontracted employees followed the ACI’s Hot Weather Concreting procedures. Workers were provided with lots of water, rest and shade as well as educated to recognize the signs of heat-related illnesses in themselves or in a co-worker. Our hard-working crews formed, pumped and placed 55,000 CY on the project, which also includes the construction a 990-stall concrete parking structure adjacent to the new facility. We also used our pumps to pour piles 60’ below ground-level for Becho, another one of our trade partner on the job. Phase One of the project includes a three-story administration and support building with an extension of the existing below grade tunnel. Phase Two includes a four-story structure consisting of two housing units and mezzanine levels. The entire project is expected to be completed this winter. To celebrate the topping out of the structure and as a thank you to our crews and their families, we held a Pre-Father’s Day Company picnic at Prado Dam. Over 250 people showed up to enjoy the hotdogs, BBQ, and other treats. Prizes were awarded and games were played by the kids and grownups alike. Please visit Conco’s website to learn more about the various scope of our large portfolio and the range of our professional concrete solutions. The Conco Companies are a leading supplier of concrete services for the Western U.S and we got our start in the Bay Area in 1959. Our success has come from offering clients the best value on a wide range of concrete services and products and we are now one of the region’s top commercial concrete contractors. We currently serve the areas of Southern and Northern California, Oregon, Washington Colorado, and Nevada. Conco Reinforcing has been extremely busy over the last couple of years and our services have been employed on a number of different types of projects. From airports to mixed-use high-rises, public works, highway projects and others, our two fabrication plants and installation crews have remained hard at work.
One recent project from The Conco Companies includes providing a full range of concrete services for the new five-level Midfield Satellite Concourse North and the Baggage Optimization Project (BOP). This will be a large addition to LAX’s Tom Bradley International Terminal (TBIT). Along with providing concrete reinforcement, we are also providing concrete pumping, formwork and shotcrete. The Conco Companies also recently began work on the new Tacoma Convention Center Hotel in Tacoma, WA. For the $20 million mixed-use development, Conco services will include the concrete reinforcement along with concrete pumping, formwork, shotcrete and finishing. We were selected for the job due to our successful portfolio of big projects as well as our proven ability to handle aggressive deadlines. When finished, the high-rise will be the second tallest building in the city. Conco Reinforcing has also done a lot of highway work over the last couple of years including the $2,200,000 Highway I80/SR12 Separation Interchange in Cordelia, CA. Working with Viking Construction, the project was started in November 2014 and completed in 2016. Another project was the $6,700,000 Highway 4/I-5 Expansion in Stockton, CA with Brosamer & Wall that was also complete in 2016. This is just a few of the construction projects up and down the West Coast that have taken advantage of Conco’s premium concrete services. Our large resources and talented pool of employees allow us to successfully take on the most challenging projects. The Conco Companies are 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 four regional offices serving California, Oregon, Nevada, Colorado and Washington. |
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