Container House Drainage System
The container house drainage system achieves efficient drainage and leak prevention through the coordinated operation of multiple aspects, including external, internal, and roof drainage, as well as pipe design, ventilation, and odor prevention. Details are as follows:
The external drainage system serves as the fundamental safeguard. During installation, ensure that the ground level of the container house is higher than the surrounding terrain. Dig drainage ditches around the container body and use gravity to guide rainwater and wastewater to drain naturally, preventing waterlogging and backflow. In humid and rainy regions, a gable-shaped canopy can be added to the roof to increase the drainage slope and enhance the efficiency of rainwater diversion, reducing the pressure of water accumulation on the roof.
The internal drainage system focuses on the treatment of domestic wastewater. Waterproof floor drains should be installed in areas such as kitchens and bathrooms, connected to pre-embedded sewer pipes. The drainage design primarily adopts same-floor drainage: the drainage branches of sanitary fixtures on the ground floor converge under the floor to the main drainage horizontal pipe (with a slope ≥ 2%), which is ultimately connected to the main drainage vertical pipe at the bottom or to an outdoor septic tank/municipal sewer network; the drainage branches on the second floor also converge under the floor of that level, with the main drainage horizontal and vertical pipes arranged in the ceiling space of the ground floor, enabling sewage discharge through pipe 'penetration'. This design reduces pipe penetration through floors, lowers the risk of leakage, and facilitates maintenance.
The roof drainage system needs to balance drainage and sealing. Some container houses are designed with circular drainage troughs on the roof, which direct rainwater into the ground through downspouts inside the columns, preventing rainwater from seeping down along the side walls of the container. The seams of the roof iron sheets should be sealed with structural adhesive, and the moisture-proof membrane should be tightly adhered to prevent rainwater from leaking into the interior through the seams.
The materials and slope of drainage pipes are crucial for smooth drainage. Drainage pipes are mainly made of PVC-U pipes, which are corrosion-resistant and have tight connections. During design, accurately calculate the pipe slope, and strictly follow the slope during construction to ensure that sewage flows naturally due to gravity and prevent blockages.
The ventilation system balances the air pressure in the pipes. The top end of each main drainage vertical pipe must extend above the roof or high on the side wall, and a ventilation cap should be installed to prevent negative pressure from forming in the pipes during drainage, which could damage the water seal, leading to odor backflow or poor drainage.
Water seals and odor prevention serve as the final line of defense. P-type or S-type traps should be installed below each drainage fixture (floor drains, sinks, basins) to create a water seal with the stored water, isolating sewer odors and pests and ensuring indoor air quality.
