Support structure for hdpe
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This document provides instructions for properly supporting pressure pipes. Pipes need supports at fittings, valves, and ends to prevent stress peaks. Supports are made of reinforced concrete and are designed to withstand pressures 1.5 times the design pressure. Fittings like bends and tees must be completely surrounded by concrete. Pipes must be supported before pressure testing on site. Tables provide dimensions for pipe supports based on pipe diameter and type of fitting. The design should consider soil properties and pipe depth to ensure structural limits are not exceeded.
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- 2. INSTALLATION 8.12 Reaction Force in a Pipe Bend P = p A = p p D2 / 4 R = 2 P sin a / 2 where p = pressure D = pipe diameter under water pressure a = pipe bend
- 3. INSTALLATION 8.13 Support length (l) mm h b Reinforcement Bend = mm mm Steel A 40 H Pipe 100 (300) 400 500 300 150 ø 8 k/k 200 # 150 (500) 600 800 450 150 ø 8 k/k 200 # I.D. 200 (400) 600 700 1000 600 200 ø 8 k/k 200 # 250 (500) 800 1000 1400 700 200 ø 10 k/k 200 # mm 300 700 1000 1200 1800 800 250 ø 10 k/k 180 # 400 900 1400 1800 2500 1000 300 ø 10 k/k 150 # 500 1100 1600 2100 3000 1300 350 ø 12 k/k 200 # 600 1300 1900 2400 3400 1600 400 ø 12 k/k 190 #
- 4. INSTALLATION 8.14 Design of support 1. Basic table in frictional soil. Friction angle = 28°. Density 17 kN / m3 (1.7 t / m3 ). Depth of the pipe - center line Z = 2 m. Pressure in the pipe 10 bar, 1 MPa. 2. If the friction angle > 35° (ex. gravel) the support slab can be decreased by 30% (factor 0.7). In cohesive and intermediate soils the slab must be increased by 50% (factor 1.5), if the shear strength is higher than 1.5 kPa (1.5 t / m2 ), and 100% (factor 2.0) if the shear strength is higher than 10 kPa (1.0 t / m2 ) and smaller than 15 kPa (1.5 t / m2 ). 3. The depth of the pipe is paid attention to by using a correction factor 2 / Z. Z is the depth of the center line of the pipe. EXAMPLE 1. D = 300 mm = 68°, frictional soil = 40° Z = 2,5 m A = 2 / Z x 0.7 (1.4 x 0.2) = 0.63 m2 , take 800 mm x 800 mm = 0.64 m2 EXAMPLE 2. T-piece = 90° Soil clay, shear strength 12 kPa Z = 1.8 m A = 2 / 1.8 x 2.0 x (1.0 x 0.6) m2 = 1.33 m2 , take 2250 mm x 600 mm