Linea Los Angeles Wins ACI Award for Decorative Uses of Concrete

The American Concrete Institute (ACI) gave the “Decorative Uses of Concrete Construction” award to the Linea Apartments in Los Angeles, CA. Click here to view a list of all the projects which received recognition at this years virtual event and check out the Linea project video below:

The Linea mid-rise luxury apartment complex is centrally located along Sepulveda Blvd. between Pico and Exposition in West Los Angeles. The 545,000gsf development features two levels of below grade parking, three levels of retail and commercial space starting at street level, and residential units from the podium deck up. A total of 911 parking stalls are provided for the 566 market rate and 66 affordable housing units. Residential space is spread out across one ten level and three five level structures rising from the podium. The boomerang shaped nine level structure is located toward the back of the podium and has post-tensioned slabs and a concrete moment frame with both upturned and downturned beams. The five level buildings are light gauge metal stud structures facing Sepulveda Blvd.

The 125,000sf of slab on grade area starts two levels below grade with 1,550CY of shotcrete applied to the perimeter and radial ramp walls of the subterranean parking levels. Due to rebar congestion shotcrete crews utilized a “hybrid method” to place the pilasters in the perimeter basement walls. This is accomplished by forming the pilaster with Stayform then pouring and vibrating readymix into the form without the air component. The Stayform is then removed and the surface is pneumatically applied and finished in the traditional shotcrete fashion. 14,000sf of 22’ tall decks are also featured in the podium structure where teams used Titan XL 625 posts for shoring. During the height of construction in the J-shaped shaped podium Largo had two boom pumps onsite utilizing four masts.

The podium plaza level features a landscaped courtyard with two pools and communal outdoor dining and recreation areas. The modern outdoor living space is decorated with 10,000sf of architectural board-formed concrete parapet walls and planters. The exposed concrete look is carried on to the courtyard roof deck on level ten of the cast-in-place structure, where more concrete benches and board-formed planters can be found lining another pool, a spa, daybeds and cabanas.

Designed by Van Tilburg, Banvard & Soderbergh Architects with Englekirk providing the structural engineering, the development opened during the summer of 2020. The penthouse currently rents for over $15,000/month with impressive views of the I-10 and I-405 interchange. Overall, Largo Concrete placed 53,200CY of concrete over 11 months. 73 elevated deck pours were accomplished over a 9.25-month duration averaging a pour ever 2.7 working days.

Ivy Station Wins ACI Award for Outstanding Performance in Design and Engineering

The American Concrete Institute (ACI) recently awarded the Ivy Station project the award for Outstanding Performance in Design and Engineering. Click here to view a list of all the projects which received recognition this year and check out the Ivy Station project video below:

The new development sits adjacent to the Culver / Venice Metro Line Station in Culver City, CA along Venice and Jefferson Blvd. This city-block-wide transit-oriented development is a true mixed-use project with a commercial office space, hospitality rooms and residential units with a retail plaza at street level. Each component sits atop a three level below grade, 607,000sf parking podium housing 1,538 stalls, 300 of which are dedicated to Metro riders.

The versatility of the podium is also depicted with three different building types rising from the 218,000sf plaza level lined with space for retail and food stores. The 148-room hotel utilizes structural steel while the 200 residential units are spread across wood frame. Both components are five stories tall sitting atop an elevated deck of concrete while the entire commercial building is cast-in-place concrete.

Over 23,600CY was placed for the 236,700sf mat foundation ranging from 17” to 60” thick three levels below the street. Largo utilized their own powerful City Pumps to hose the readymix hundreds of feet from the street down to the jobsite. Nearly 3,000CY of shotcrete walls were pneumatically placed around the perimeter of the basement parking levels. Interior structural walls up to 3’ thick enclose staircases and radial ramps giving pedestrians and vehicles access to the below grade parking.

At the plaza level, structural columns switch from rectangular to circular which juxtapose the angular shaped decks. Typical levels have a 13’8” floor-to-floor height with the first and fifth levels at 15’. The concrete columns, interior walls and soffits remain exposed throughout the commercial building to usher views outward to the street and plaza with a grand entrance off Venice reaching 28’5” in height. Largo worked with general contractor Bernards, KFA architects and Englekirk structure engineers to place 81,500CY of concrete over 14 months.

Le Conté Apartments becomes UCLA’s Tallest Building

Largo Concrete topped out at the UCLA Le Conté Apartments this summer making it the tallest building on campus. The undergraduate student housing project is located at the corner of Le Conte and Gayley Avenue on the south side of the campus. The south building is 11 cast-in-place levels above grade and the north is 19. The overall project is 301,761gsf and will add 1,167 beds in 192 rooms. General contractor PCL Construction, Studios Architecture and Nabih Yousseff & Associates structural engineers are on track for temporary occupancy in the Winter of 2021.

Circa and Disney win Pankow Awards from the American Concrete Institute

The American Concrete Institute’s Southern California Chapter has selected the Disney Frontierland Expansion and the Circa projects for the annual Pankow awards!

Charles Pankow Jr. Award – Circa at 1200 S. Figueroa

The focal point of this $500 million mega-project are the twin high-rises adjacent to the Staples Center in downtown Los Angeles.  26 residential levels sit atop eight levels of podium parking, two of which are below grade, with commercial space at grade level. Designed by architects Harley Ellis Devereaux both towers stand 420’ and hold 648 total units. The 2-acre amenity deck complete with swimming pool and fitness center is located on the podium level above 1,645 stalls of parking. Situated between LA Live, the Convention Center and the Metro Pico Station in the city’s South Park district, the high-rise buildings feature an elliptical north face to enhance views of the skyline and mimic design themes from surrounding architecture.

Structural engineer Cary Kopczynski & Company utilized cast-in-place concrete with post-tensioned slabs which minimizes internal columns for maximum openness. The use of a two-way post-tensioned slab system allowed for continuity of framing between the retail/parking podium and the residential levels above, eliminating the need for transfer beams. A combination of shear walls and ductile frames resist seismic loads.

In June 2015, Largo started by pouring four large mat foundations totaling 15,985CY with ready mix supplier Holliday Rock.  Over the course of 24 months Largo poured a total of 110,000 cubic yards installed by 600,000 man-hours without any days away from work safety incidents.  All this was all accomplished across the street from the home court/rink of multiple professional sports teams and millions of convention center guests.

Outstanding Performance in Design and Engineering Award – Disney Frontierland Expansion

The goal of this project was to prepare the Disneyland park for the new Star Wars attraction. In addition to four tunnels, multiple retaining walls and a marina, Largo’s scope included a concrete trestle bridge for the railroad at the Rivers of America attraction. Although the visual aspect of the end product is exquisite, the details that were put into the fabrication of the two elements of the structure; the columns and hammerheads, and the concrete mix design used to simulate an aged wooden railroad trestle bridge, is also noteworthy.

The columns started in the back lots of Walt Disney Imagineering as an image in the mind of the design team. This image was transformed into approximately 50 lineal feet of hand carved foam positive. This was reviewed by the Disney team to confirm their vision and sent out to Fitzgerald Formliners to confirm that the positive would produce a usable form liner. A number of changes were made in the foam positive to ensure that no negative spaces existed in the positive to allow for smooth removal of the form liner. To allow for proper alignment of the four columns that attached to each of the twelve hammerheads, relative to each other, the column forms were fastened to a wall form.

With all of the details in the form liner, Largo contacted Holliday to discuss the appropriate concrete mix design to ensure a perfect positive from the very detailed form liner. Although self-consolidating concrete is not frequently used in the Southern California Market, it was determined that with the details, the importance of exact alignment of the columns and the limited space within the column form to allow for a vibrator, that this would be the appropriate mix design to yield the best finished product.

4000 psi @ 28 days Self Consolidating Concrete mix with a water to cement ratio of 0.44. The cementitious content was 8.5 sacks that was 70% Type II/V cement and 30% Type F Fly Ash. Nominal spread was 25” to 30” but it was usually in excess of 27”. It has a maximum aggregate size of 3/8”, but since the mix needed to reveal very fine details it was proportioned to contain 70% Washed Concrete Sand. All of the aggregates are from Holliday Rocks Upland California Facilities. The admixtures in the mix design included: a Type F High Range Water Reducing Superplastizing polycarboxylate, a workability-retaining admixture that provides flexible degrees of slump retention without retardation. And when needed (in this case it wasn’t but was always available) a viscosity-modifying admixture that is specially developed for producing concrete with enhanced viscosity and controlled rheological properties that increases resistance to segregation while facilitating placement and consolidation.

The hammerheads that span across the columns were formed out of rough sawn dimensional lumber of varying widths on top of the above-mentioned columns. Each of the twelve hammerheads were formed with no common joint plan of the rough sawn lumber. Steps were taken to raise the texture of the rough sawn lumber. Each board was soaked in water overnight and sealed with form release to accentuate the rough sawn look to the vision of the Imagineers. The hammerheads were also poured with the self-consolidating concrete mix design that was used in the columns.

Typically, these decorative types of concrete elements are a post installed façade covering a structural column, but with the load requirements of the train, envisioned size of the elements and the environmental concerns of the river, the above summarized use of concrete was developed and put to use.

Park 5th Tops Out

Across the street from Pershing Square, Largo topped out at the Park 5th development in downtown Los Angeles this week. The building rests on a 4,700CY mat foundation which was poured in August 2017, with two levels below grade and 25 levels above. Patrons of the 347 unit high-rise will enjoy a rooftop deck with a club room, fitness center, a bar/kitchen, TVs, a business center, and an infinity pool with cabanas. Designed by architect Ankrom Moisan and Nabih Youssef & Associates structural engineers, the buildings is seeking LEED Silver certification by the USGBC. Working with general contractor Suffolk Construction the building is scheduled to be open in the first quarter of 2019.

437 S. Hill Podium

The MacFarlane Partners are also developing the site adjacent to the high-rise into a new mid-rise apartment complex. Largo worked with Bernards on this project pouring the concrete in a 5 level parking podium with wood frame above.

High-Rise Topping-Out at 732 Spring, Los Angeles

Located in downtown LA’s historic core, the 732 Spring Street high-rise topped out this week with the Holland Partner Group. The tower stands 24 stories above grade with two additional levels of subterranean parking and retail on the ground floor. 300 residential units are spread across the upper 20 levels sitting above 430 parking stalls across the lower levels. The architecture blends a historic base with contemporary design with distinguished vertical elements alongside an all-glass facade. The building is designed by MVE Architects and Glotman Simpson Structural Engineers and is scheduled to open during the summer of 2018.

High-Rise Topping Out at 8th and Spring, Los Angeles

Located between downtown’s Historic Core and the Fashion District, this 32 level residential building is on the north corner of West 8th and Spring Street. Designed by MVE Architects and Glotman Simpson Structural Engineers, the building features 275 residential units across 19 levels and 612 parking stalls across 9 of the lower levels. The building façade incorporates the old with the new and features parapet walls and defined vertical elements from the ground floor to level 19 where an all-glass skin continues the rest of the way up. The amenities deck on level 7 includes a pool, spa, barbecues, outdoor lounges, a fitness room and a common area with additional public viewing area on the roof deck. Working with general contractor Holland Partner Group the development is scheduled to open during the summer of 2018.

Park 5th Mat Foundation Pour

Largo placed 4,700CY of concrete at the Park 5th Development in downtown Los Angeles right across from Pershing Square over the weekend. The large foundation sits at the based of a 25 story residential high-rise building scheduled to open early 2019. Working with architect Ankrom MoisanNabih Youssef & Associates structural engineers and general contractor Suffolk Construction, Largo anticipates topping out in August of 2018.

High-Rise at Wilshire & Crescent Tops Out

One block west of the Miracle Mile in Los Angeles, Largo recently topped-out on a high-rise residential tower on the corner of Wilshire and Crescent Heights Blvd. Working with Matt Construction the high-rise building consists of 20 levels above grade and 3 levels below for a total of 393,137gsf. The building is designed by Steinberg Architects and Nabih Youssef Structural Engineers and features 150 apartment units, 7 levels of parking providing 411 stalls and a rooftop terrace complete with lounge, swimming pool, fire pit and a hot tub. Typical levels provide 10’6″ floor-to-floor heights while the level 17 penthouse and 18 skydeck are 14′ and 18′ respectively. The project also includes 6,000sf of retail space on the ground floor, a open space terrace at the back of the development and two levels of structural steel at the top housing MEP support facilities.