VIP exclusive Structural Drawing of Reinforced Concrete Circular Pipe Culvert Orthogonal Straight Wall Portal (including BOQ)
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Main technical standards: 1. Design load: highway - Class I; 2. Environment category of the structure: Class I; 3. Design safety level: Level III Main materials: 1. Pipe body concrete: C30 concrete. 2. Pipe body reinforcement: R235 reinforcement and HRB335 reinforcement are used. 3. Foundation: C 20 concrete is used for pipe body foundation. 4. Opening: C20 concrete is used as cap stone. 6. C20 concrete is used for splayed wall body, straight wall body, straight wall body and foundation. 7. C20 rubble concrete shall be used for the river bed paving and diaphragm wall at the portal, and the strength grade of rubble stone shall not be less than MU50. ...... Design calculation: ①. This general drawing checks the strength and crack width of the section according to the bearing capacity limit state and the normal service limit state. ② Calculation theory: the calculation is based on rigid pipe joint, that is, the deformation of the pipe joint is not considered, and the friction between the soil column at the top of the culvert and the surrounding fill is not considered. The angle distribution method is used for calculation, and the semi infinite elastic body theory is used for calculation. ③ The pipe joint reinforcement is analyzed according to the pure bending section. The two-way reinforcement pipe wall is used to set two layers of reinforcement inside and outside the circle. The pipe joint reinforcement is designed by crack control. ④ The vehicle load is used as a variable action, and the self weight of the fill and pipe body is used as a permanent action. The effect combination shall be carried out according to the specification requirements. ⑤ . Soil weight: calculated according to soil column weight theory, internal friction angle φ= 35 °, soil unit weight: 18KN/m3. ...... Structure: ①. Pipe joints are divided into standard pipe joints and auxiliary pipe joints for length adjustment. The standard pipe joint is 2m long, and the auxiliary pipe joint is 1m and 0.5m long. ② The water flow condition at the portal is good, and the splayed wall type portal should be used. When the splayed portal is used, the tapered slope protection should be used to ensure the stability of the end wall and improve the drainage. ③ Pipe joint structure: the gap between pipe joints shall be filled with asphalt yarn and asphalt oakum soaked in asphalt, and the outer ring shall be fully coated with two layers of hot asphalt. ④ . Foundation structure: C20 concrete foundation is used for general soil sections, and sand gravel cushion is used below; C20 reinforced concrete is used in soft foundation section. ... 1 sheet in total.
