Construction of steel metal corrugated pipe culvert

The method of manual excavation or a combination of manual labor and small machinery is used for controlled excavation of foundation pits. When constructing ditches with existing irrigation water flow, temporary channels are excavated to ensure normal irrigation of farmland. After excavating to the design elevation, lay a gravel cushion layer and pour foundation concrete. Reinforced concrete pipe sections are prefabricated on-site according to design specifications and installed using lifting equipment approved by the supervising engineer.

The installation of the complete pipe section starts from the downstream, with the joint facing upstream. Each pipe section forms a smooth straight line along the slope of the water flow, and the entire length of each culvert pipe is closely attached to the already laid foundation, ensuring even stress distribution on the culvert pipe.

The culvert pipe section adopts a ring joint, and the joint form is filled tightly with asphalt wool, cement slurry or asphalt sand to make it stable, durable and leak water. Before filling the asphalt sand, apply an asphalt coating on the outer surface of the circular culvert and the inner surface of the ring to enhance its adhesion, and fix the tying rope according to the location shown on the drawing to prevent the asphalt sand from leaking out.

After the installation of the circular culvert pipe is completed and approved by the supervising engineering inspection, backfilling operations can be carried out. Backfilling is carried out by layering cohesive soil on both sides of the pipe section and compacting it with small compacting machinery.