Constructora MECO delivered the new overpass in Paso Ancho to the Costa Rican country, a priority project to streamline the traffic in the city of San José, specifically on the Ring Road, where an estimated 90,000 vehicles drive daily.
The works consist of a 6-lane viaduct, 2 semicircular bridges, access ramps and exits from the roundabout.
This underpass also means an important progress for the construction field in for the country, since it is the first structure to use curved beams and a 600 meter-long and 12 meter-high pile wall, which makes this overpass a unique work.
The overpass in Paso Ancho incorporates innovative building systems which allowed permanent access to drivers in 2 lanes, despite the two especially complex tasks: the excavation of the viaduct and the lifting of the walls.
With an investment close to $500.000 in occupational security and safety, the construction achieved a zero-accident record along the 23 months of work. This amount includes personal protective equipment, environmental services, day and night signaling and ongoing maintenance.
A work of great proportions
The construction of the Paso Ancho overpass involved:
• Remove 118 thousand cubic meters of material from the old Paso Ancho roundabout (the initial estimate increased in 48.000 cubic meters, since the works were planned for the dry season and it was executed during the rainy, forcing to work in wet and less compact soils)
• 9800 truck trips were required to transport the material to private landfills in Tres Ríos, Desamparados and Pavas for proper disposal.
• The participation of 240 direct collaborators and 200 heavy machinery vehicles, like crawler tractors, bulldozers, excavators, soil compactors, trucks, asphalt distributors, pavers and piling rigs, among others.
• 4200 meters of active anchorages that support the 3500 square meters of pile wall.
Elementary Raw Materials
The underpass of Paso Ancho required strict planning and execution of materials, among them:
• 5.000 cubic meters of concrete
• 500.000 kg of steel
• 45.000 cubic meters of materials transported from the pit
• 6.000 tons of asphalt
• 170.000 kg of structural steel for bridge superstructure beams