Type B Cold-formed Foldable Pipe, B-type Corrugated Pipe, Plastic Pipe for Drainage and Sewage Proje

      In the reconstruction of urban and rural pipe networks, residential infrastructure construction and park supporting projects, the laying of buried drainage and sewage pipelines faces numerous on-site challenges. Conventional rigid pipes require trenches to be excavated with high straightness. For sites with limited space or where slight directional changes of pipelines are needed, a large number of fittings must be installed for angle adjustment, increasing material and labor costs for construction. Some pipes are heavy, requiring substantial manpower for handling and lowering into trenches, which slows down long-distance construction progress. As an engineering plastic pipe, Type B cold-formed foldable pipe balances the ring stiffness and bendability of pipelines, offering a new pipe option for rainwater and sewage drainage network construction.

      Type B cold-formed foldable pipe is extruded from high molecular plastic raw materials. Corrugated structures on the pipe wall improve the radial pressure resistance of the pipeline. Featuring inherent cold bending and folding performance, the pipe can be bent directly on-site within the allowable range without cutting or elbow fittings to realize minor adjustment of pipeline routes. Each pipe section is manufactured in long lengths, reducing the number of joints and lowering the risk of leakage at connections. The pipe has light self-weight; short-distance transportation can be handled by a single worker, cutting manpower input for pipe lowering operations, and suiting construction environments such as open fields and narrow trenches. Its outer wall is corrosion-resistant. After being buried underground, it can resist erosion by acidic and alkaline substances in soil and maintain structural stability under long-term buried service conditions.

      Municipal rainwater and sewage diversion renovation is one of the main application scenarios for Type B cold-formed foldable pipes. Old urban areas feature complicated underground pipeline layouts and narrow trench excavation space, where pipeline directions need frequent fine-tuning. Using this pipe reduces the use of supporting fittings such as elbows and tees, simplifies on-site pipeline layout procedures and shortens the construction period. When buried beneath motor vehicle roads, the corrugated structure bears overlying soil and vehicle loads to preserve pipe shape and meet drainage transmission requirements under urban roads. It is also applicable to township sewage treatment projects. Narrow rural roads restrict the access of construction equipment, and the lightweight pipe is easy to transport, suitable for the laying of decentralized sewage pipe networks.

      For infrastructure construction in residential communities, the construction of rainwater collection and domestic sewage discharge pipe networks inside residential areas often involves pipeline layout around green belts and underground garages. Pipelines are interlaced on-site and slight directional adjustments are frequently required. The bending property of Type B cold-formed foldable pipe adapts to such complex routes. When buried under green belts, the pipe resists extrusion from plant roots and reduces the frequency of later pipeline inspection and maintenance. For phased project construction, the pipe can be stored conveniently and delivered in batches, matching the phased construction schedule of real estate projects.

      In the construction of supporting pipe networks for industrial parks, buried pipelines are required for the collection and discharge of factory production wastewater and site rainwater. Heavy-duty vehicles frequently travel on factory ground, so pipelines need to withstand soil pressure and dynamic loads. The corrugated structure of Type B cold-formed foldable pipe enhances ring stiffness to cope with buried pressure conditions in factory zones. Many structures are distributed on some factory sites, and pipelines need to bypass equipment foundations and building caps. The on-site cold bending feature of the pipe reduces on-site cutting and fitting assembly, improving the efficiency of pipe network laying.

      This pipe can also be adopted in cultural tourism parks and landscape supporting projects. Landscape areas are characterized by undulating terrain, and rainwater pipe networks need to adjust routes following terrain changes. The pipe can be slightly bent to conform to terrain, reducing large-scale trench excavation and earthwork volume while protecting the original green landscape. The smooth inner wall creates low fluid resistance for fast rainwater discharge and alleviates site water accumulation.

      The product is formed by an automated extrusion production line, with indicators such as pipe wall thickness and ring stiffness controlled throughout production. The pipe joint structure is simple for easy connection, enabling construction workers to quickly join pipe segments on site. Different calibre specifications are available according to project requirements to adapt to drainage and sewage projects with varying flow rates.  Supporting accessories including sealing rings are supplied to ensure sealing performance at pipe joints, preventing sewage seepage and groundwater infiltration into pipes, and meeting procurement and construction demands for various buried drainage projects.