Irrigation Structures I-(10-1).pdf - 2 Example of Box Culverts A canal of cross section shown in figure(1 Has to cross a highway through a reinforced

# Irrigation Structures I-(10-1).pdf - 2 Example of Box...

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2 Example of Box Culverts Moving loads = 70 ton lorry (Figure (2)) Canal bed slope = 20 cm/km Manning's coefficient (1/n) = 40 The heading up is not to exceed 20 cm Minimum submersion = 0.50 m For screen loss, kesc = 0.2 For friction loss, a = 0.00316 & b = 0.0305 For soil, γ = 1.8 t/m3 & Φ = 30 ° A canal of cross section shown in figure (1). Has to cross a highway through a reinforced concrete culvert, it is required to design the culvert according to the following data: Required : Check the heading up and fix the number and dimensions of the barrels. Design the most critical section and show the reinforcement of the box culvert. Give detailed sketches for the following: Plan half earth removed Sectional elevation
3 Example of Box Culverts
4 For bending moment calculations, you can use the following table Example of Box Culverts
5 Design of culvert Hydraulic design 2 ( ) (5 2.2) 2.2 15.84 A b zd d m = + = + = 2 2 5 2 2 2.2 11.22 P b d m = + = + = 1 5 .8 4 1 .4 1 1 1 .2 2 A R m P = = = ( ) 1 / 2 2 / 3 2 / 3 1 / 2 3 5 1 2 0 4 0 1 .4 1 1 5 .8 4 1 1 .2 7 / 1 0 Q R S A m s n = = = 1 1 .2 7 0 .7 / 1 5 .8 4

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• Winter '13
• ayman zakaria