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10. What is double wall corrugated pipe and what are its applications?
Double wall corrugated pipe is made up of two layers of corrugated tubes that are nested together, with a smooth outer surface and a corrugated inner surface. The outer wall provides structural strength, while the inner wall provides stiffness and resistance to deformation from external pressure or soil settlement. This type of pipe is primarily used for underground stormwater drainage and sewer applications.
1. How is double wall corrugated pipe installed?
Double wall corrugated pipe is typically installed using a trenchless method, such as horizontal directional drilling or pipe bursting, to reduce disturbance to the surrounding land. For traditional open trench installation, the trench should be dug to the appropriate depth and width. The pipe should be placed on a level bed of clean, compacted soil, and the trench should be backfilled with the same type of soil in layers no more than six inches thick. It is important to verify proper slope and alignment during installation, and to use appropriate backfill materials and compaction techniques to prevent settling or damage to the pipe.
2. What types of joints are available for double wall corrugated pipe?
Double wall corrugated pipe joints can be either bell-and-spigot or plain-end. Bell-and-spigot joints involve inserting the spigot end of one pipe into the bell end of the next pipe, creating a leak-tight seal. Plain-end joints require an appropriate coupling or flange to connect two pipes. Both types of joints should be properly sealed to prevent infiltration or exfiltration of water and debris.
3. What maintenance measures should be taken for double wall corrugated pipe?
Periodic inspection and cleaning are important for maintaining the performance of double wall corrugated pipe. Regular visual inspections can identify any visible damage or signs of corrosion, while cleaning the pipe can reduce the buildup of sediment or debris that can obstruct flow. Flushing the pipe with high-pressure water or using specialized cleaning equipment can effectively remove buildup without damaging the pipe. Additionally, monitoring the surrounding soil conditions can help identify any issues with settling or shifting that could affect the integrity of the pipe.
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