Super Large Box Culvert 'Super Wide Box (SWB)'
Super large box culvert with post-tensioned PC steel materials arranged in the top slab.
■NETIS CB-080002-A (Publication Ended) ■This is a box culvert constructed with PC steel materials for the top slab and side wall components, designed with a PRC structure. ■It is suitable for ultra-large cross-sections ranging from 10.0m to 13.0m in width. (Please consult us if exceeding 13.0m) ■The top slab and side wall components are made of precast concrete, while the bottom slab component is constructed with cast-in-place concrete. ■To shorten the construction period, it is also possible to use precast components for the bottom slab. ■The angle can be freely set up to 75°. (Please contact us for angles less than 75°) ■It is widely adopted at many sites as an alternative to small-scale bridges.
basic information
【Design Conditions】 Soil Cover: 0.2m to 2.0m Dead Load Unit Weight of Reinforced Concrete: 24.5 kN/m³ Unit Weight of Soil: 18.0 kN/m³ Unit Weight of Asphalt: 22.5 kN/m³ Live Load (Road Crossing): T-25t Horizontal Earth Pressure Coefficient: 0.50 Groundwater Level: Not considered Applicable Ground: Generally, good ground of ordinary ground or better. Allowable Tensile Stress of Reinforcement: 180 N/mm² Side Wall Joint Method: Jointed with PC Steel Bars Concrete Design Standard Strength: Top Slab Member: 50 N/mm² Side Wall Member: 40 N/mm² Bottom Slab Member: 30 N/mm² (cast in two locations) *Separate considerations can be made outside the above design conditions. *If the inside of the box contains a roadway, sidewalk, and high external water level, water-stopping measures need to be considered.
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