HDPE 사이펀 우수관 설치 및 시공

The roof rainwater drainage system uses HDPE siphon rainwater pipes, which can quickly and effectively drain rainwater from the roof, avoid water accumulation on the roof, and ensure the waterproof performance and structural safety of the building.

• HDPE 파이프 and fittings must have quality certification documents, and their specifications, models, and wall thickness must meet design requirements. The inner and outer surfaces of the pipes must be smooth and flat, free of defects such as bubbles, cracks, dents, uneven color, or decomposition discoloration lines.
• The matching sealing rubber ring material must comply with relevant standards and exhibit good elasticity and aging resistance. The rubber ring must be free of defects such as distortion, deformation, and cracks.
• Stainless steel clamps, bolts, and other connecting accessories must be of qualified material, with specifications matching the pipes and fittings, and free of rust and damage.

• Prepare pipe cutting tools, such as electric pipe cutters and manual pipe cutters. Ensure the cutting blades are sharp and can ensure a flat, vertical cut surface.
• Equip a dedicated pipe hot-melt welder (for hot-melt connections). The welder should be of good quality, with accurate temperature control, and capable of meeting the hot-melt welding requirements for pipes of varying diameters.
• Prepare other tools required for installation, such as a tape measure, level, plumb bob, wrench, hammer, etc., and ensure all tools are complete and in good condition.

• Construction personnel should be familiar with the construction drawings and clearly understand the route, slope, connection method, and installation requirements for each part of the siphonic rainwater pipe. For complex joints, such as where the rainwater gutter connects to the pipe and where the pipe passes through floors or walls, they should pay special attention to the construction details.
• The technical leader should provide detailed technical briefings to the construction team, covering the construction process, quality standards, safety precautions, and measures to protect the finished product, to ensure that construction personnel are fully aware of all construction requirements.

• The rain gutter should be positioned accurately according to the design drawings, ensuring that the centerline of the gutter aligns with the watershed of the roof’s drainage slope to ensure smooth rainwater flow into the gutter.
• The connection between the rain gutter and the roof waterproofing layer should be tight to prevent rainwater leakage. Before installing the rain gutter, waterproof the roof first, then secure the gutter base to the roof structure with expansion bolts or welding.
• The water inlet of the rain gutter should be horizontal, and a slightly lowered depression should be formed around it to facilitate rainwater collection. After installation, remove any debris from the gutter to ensure smooth drainage.

• Pipe Cutting: Use appropriate cutting tools to cut HDPE pipes according to design requirements and actual site conditions. Ensure the cut surface is perpendicular to the pipe axis and that the cut is smooth and burr-free. Manual pipe cutters can be used for pipes with diameters less than or equal to DN160; electric pipe cutters are recommended for pipes with diameters greater than DN160.
• Pipe Connections:
• Hot Melt Connection: Suitable for pipes with diameters less than DN160. Preheat the hot melt welder to the specified temperature and heat the pipe and fitting joints separately. The heating time and temperature should be strictly followed according to the welder’s operating instructions, based on the specifications and materials of the pipe and fitting. After heating, quickly insert the pipe into the fitting to the marked depth and hold for a sufficient time to allow the pipe and fitting to fully fuse. During the connection process, maintain concentricity between the pipe and fitting to avoid eccentricity.
• Rubber Ring Connection: Suitable for pipes with diameters greater than or equal to DN160. First, clean the rubber ring and place it over the connecting end of the pipe. Then, insert the pipe into the socket of the fitting to the required insertion depth. During insertion, use a special tool to evenly push the rubber ring into the socket to ensure it is correctly positioned and seals properly. After the connection is complete, manually twist the pipe to check the connection’s security.
• Pipe Installation: Install the pipe according to the design’s route and slope. The slope of a siphonic rainwater pipe is generally 0.003-0.005°, which can be achieved by setting the pipe supports at different heights. The pipe should be installed horizontally and vertically to avoid twisting and deformation. During installation, the pipe should be secured promptly to prevent displacement.
• Pipe Support Installation: Pipe supports should be appropriately positioned based on the pipe diameter, weight, and installation location. The spacing between supports should comply with regulatory requirements. Generally, for pipes with a diameter of DN160 or less, the support spacing should not exceed 2 meters; for pipes with a diameter greater than DN160, the support spacing should not exceed 3 meters. The brackets must be securely installed, ensuring close contact with the pipes, without any looseness or shaking. For horizontal pipes, the brackets should be installed horizontally; for vertical pipes, the brackets should be installed vertically.
• Floor and wall penetrations: When pipes pass through floors and walls, a sleeve should be installed. The sleeve diameter should be 1-2 sizes larger than the pipe. The space between the sleeve and the pipe should be filled with fireproof, waterproof, and sealing materials, such as fireproof putty or waterproof grease. For sleeves passing through floors, the top should be 20-50mm above the finished floor, and the bottom should be flush with the floor. For sleeves passing through walls, both ends should be flush with the wall.

-After the piping system is installed, a water filling test should be conducted. Close all rain gutters and fill the piping system with water until the water level reaches the top edge of the most unfavorable rain gutter. Observe for 1-2 hours and check for leaks in pipe joints, rain gutter areas, and other locations. If leaks are found, repair them promptly until they are completely eliminated.

-After the water filling test is completed, a water flow test of the siphonic rainwater system should be conducted. Turn on the roof drainage system to simulate heavy rain conditions and observe the system’s drainage capacity and siphoning effectiveness. Check the water inflow into the rain gutter, the smooth flow of water in the pipes, and any air blockage. If any problems are found, analyze the cause and make adjustments to ensure the proper operation of the siphonic rainwater system.

1. The specifications, models, and quality of HDPE pipes and fittings must comply with design requirements and relevant standards. Quality certification documents and on-site inspection reports must be inspected.
2. The installation position of the rain gutter must be accurate, and the connection to the roof waterproofing layer must be tight and leak-free. The rain gutter inlet must be level, and the surrounding drainage slope must meet design requirements.
3. Pipe connections must be secure, well-sealed, and leak-free. For hot-melt joints, the joints must be flat and even, with no weak or missing welds. For rubber ring joints, the rubber rings must be correctly positioned and free of distortion or deformation.
4. The slope and direction of the pipe installation must comply with design requirements, with deviations not exceeding ±0.0005 of the design value. The pipe must be horizontally and vertically aligned, with no noticeable distortion or deformation.
5. Pipe supports must be appropriately positioned, with spacing meeting regulatory requirements, securely installed, and in close contact with the pipe.
6. System commissioning should meet the design drainage capacity requirements, ensure good siphoning performance, and be free of air blockage, leakage, etc.

1. Safety warning signs should be clearly displayed at the construction site, especially in hazardous areas such as rain gutter installation and elevated pipe work.
2. Construction workers should properly wear personal protective equipment, such as hard hats and safety belts. When working at height, safety belts should be hung high and used low, and attached securely.
3. When using power tools, check their insulation to ensure that the wires are not damaged or aged, and that the switches are flexible and reliable. During operation, strictly follow the operating procedures to avoid electric shock accidents.
4. Fire prevention measures should be taken during pipe cutting and welding operations. Firefighting equipment, such as fire extinguishers and fire sand, should be readily available at the work site. Smoking is strictly prohibited in the work area.
5. When handling pipes and pipe fittings, care should be taken to prevent them from rolling or slipping, potentially injuring anyone. When multiple people are working together, unified command and coordinated efforts should be maintained.
6. Waste and garbage generated during construction should be promptly removed to ensure a clean and tidy construction site.