Tianhong Pipe Industry (Nantong) Co

Siphon drainage square steel links
The siphon drainage system is a negative pressure or pressure drainage system. It is widely used in large roof buildings, such as stadiums, factories and other roofs with large spans and complex structures. It is an effective solution to roof drainage. way. The siphon roof rainwater drainage system consists of anti-whirlpool rainwater buckets, rainwater suspension pipes, rainwater risers, buried pipes, and rainwater outlet pipes. The siphon rainwater drainage system forms a siphon, which can be divided into stages such as wave flow, pulse flow (pulsating flow), piston flow (pulling flow), foam flow (emulsified flow), and full pipe flow. In the early stages of rainfall, the rainwater drainage system is suspended in the pipe. The rainwater is a non-full pipe flow, mainly wave flow and pulse flow, and the system is in a gravity flow state. As the amount of rainfall increases, the water depth in front of the bucket gradually increases, and the water flow gradually transitions to plug flow and foam flow, and intermittently produces a siphon full pipe flow pattern, and an obvious negative pressure appears in the suspension pipe. The formation of siphon will suddenly increase the drainage capacity of the system, the water depth in front of the bucket will drop again, and the system will return to the gravity flow mode. This transformation will continue for a period of time until the rainfall further increases, the water depth in front of the bucket tends to be stable, the air volume of the system decreases, and finally a stable siphon full pipe flow is formed.
According to the regulations, the suspended pipes of the gravity flow roof rainwater drainage pipe system should be designed for non-full flow. The fullness should not be greater than /, the flow rate in the pipe should not be less than /, and the slope should not be less than /, which requires a larger suspension pipe. Pipe diameter and slope. At the same time, in order to ensure that the rainwater from each rainwater bucket on the same rainwater pipe can be discharged normally, the number of rainwater buckets in a rainwater suspension pipe is limited to no more than 2, which also leads to an increase in the number of rainwater suspension pipes and rainwater risers. , at the same time, the roof load is increased, and the cost of the project is also increased.
The siphonic roof rainwater drainage system improves the drainage capacity, can quickly remove roof rainwater, reduce the roof load, and reduce the harm of roof water accumulation to the building roof structure. The number of suspended pipes connected to the rainwater bucket is not limited. It saves rainwater riser suspension pipes and does not need to be sloped. It is easy to install and beautiful. Only one installation height is always maintained in the mechanical and electrical installation space, which facilitates comprehensive mechanical and electrical coordination. There is no need to set up inspection ports or cleaning ports (because the design of the siphon rainwater bucket can The system can intercept garbage and large granular materials from entering the system and the system has a self-cleaning function. The system can reduce the diameter of the selected pipeline according to the siphon pressure flow calculation. Engineering practice has proven that it can significantly reduce the project cost.
Principle of siphon system
The siphon roof rainwater drainage system uses a specially designed rainwater bucket, so that rainwater can form a full flow state in the pipe under a very shallow gutter water depth. The height of the building and the flow are used to obtain additional pressure, causing the siphon phenomenon. Utilize the siphon effect to greatly accelerate the flow rate of water in the drainage pipe and quickly discharge roof rainwater.
Advantages of siphon system
Traditional gravity flow drainage system
Suspension pipes require a certain slope
A large number of rainwater risers
Extensive ground excavation work
Large amount of on-site construction
Large amount of pipes and accessories used
Large pipe diameter
Waste of space
Pipes are easy to block and require a large number of internal kilns
Construction speed Slow
Siphonic drainage roof rainwater drainage system
No slope required for pipes
Few rainwater risers
Flexible arrangement of rainwater buckets
Flexible pipeline direction can be set according to building needs
The amount of on-site construction is greatly reduced
Minimum ground excavation work and fewer rainwater wells
Small pipe diameter facilitates construction processing
Saving space
Pipes have self-cleaning ability
Construction is simple and fast