Water Retaining Structures
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Seven Oaks Dam on the Santa Ana River, CA, USA
Concrete intake structure for largest earth dam in North America formed with PERI VARIO and SKSF 240
Constructed by the US Army Corps of Engineers in Highland, San Bernardino County, California this earth dam is currently the largest structure of this type under construction in North America. The dam is being built on the Santa Ana River and contains 40 million cubic yards (30.58 million m³) of earth aggregate and is 550' (152.4 m) tall. The dam is 2,300' (700 m) wide at the base and 40' (12.20 m) wide at the top. It is a flood control project. The earth material was transported on a conveyor belt system to construct the dam.
Odebrecht Construction, the general contractor, chose PERI as their forming vendor to engineer, fabricate, and supply the forms for the concrete intake structure. This structure is 145' (44.20 m) high with gates every 10' (3.05 m) in height to control the water level of the dam. The intake structure has 10,000 cubic yards (7,646 m³) of concrete. The structure has 5' (1.50 m) thick circular walls that meet a straight section of the structure that has a vertical wet well.
The horizontal shape of the form is an ellipse that is tilted back on a 75 degree angle with the horizontal and meets the straight section that is tilted back at a different angle, causing the transition form between these two different shapes to constantly enlarge at every lift. It was a complex structure to form, and Fritz Huber, the project engineer and concrete superintendent for Odebrecht Construction was very satisfied with PERI's solution and product. PERI used their VARIO GT 24 forms in conjunction with SKSF 240 one sided forming brace for each lift.
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| PERI Systems In Use |
SKS Single Sided Climbing System
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| Contractor: |
Odebrecht Contractors of California, Highland, CA |
| Field Service: |
PERI Fontana |
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PERI scope 2/1998
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