Xiaochang Dawu Road Reconstruction, Double Wall Corrugated Pipe as Construction Optimization

The double-wall corrugated pipe is a new type of composite pipe made of high-density polyethylene as the main raw material through a special extrusion molding process. The inner wall of the pipe is smooth and flat, and the outer wall is a continuous corrugated structure, which has both structural strength and fluid flow advantages. At present, the Xiaochang Dawu area is promoting the global municipal road upgrade project, including the replacement of the old pipe network and the expansion of the drainage system. The double-wall corrugated pipe has become the construction preferred pipe for this renovation project due to its adaptability advantages.

The core selling points mainly include four aspects: First, the drainage flow is good, and the operation and maintenance cost is low. The roughness coefficient of the inner wall of the double-wall corrugated pipe is only 0.009. Under the same pipe diameter conditions, the flow rate of sewage and rainwater is increased by about 30% compared with traditional concrete pipes, which can meet the needs of regional drainage capacity upgrade after road renovation. At the same time, the smooth inner wall is not easy to adhere to impurities such as sediment and oil. The frequency of daily cleaning and maintenance can be reduced by more than 40%, effectively reducing the manpower and material resources investment for long-term operation of the pipe network. Second, the anti-deformation ability is strong, and it is suitable for road load requirements. The special corrugated structure endows the pipe with good ring stiffness. When laid under the conventional municipal road with a depth of 1 to 3 meters, it can stably withstand the vertical load and soil lateral pressure caused by road traffic, and is not prone to cracking and deformation problems. It can adapt to the geological conditions of different sections of plains and hills in Xiaochang Dawu area without additional complicated foundation reinforcement treatment. Third, the construction and installation are convenient and the project cycle is shortened. The weight of the double-wall corrugated pipe is only 1/8 of that of the concrete pipe of the same specification. It can complete the transshipment and laying operations without large lifting equipment. The interface is connected by elastic sealing rubber ring socket, which has good sealing performance and simple installation and operation. The standard length of a single pipe can reach 6 meters. Compared with the traditional short-section pipe interface, the number is reduced by 60%. It can effectively compress the road occupation construction time of road renovation and reduce the impact on the daily travel of residents. Fourth, it has excellent corrosion resistance and long service life. The pipe raw material itself has good acid and alkali resistance and aging resistance. It will not be corroded by humus in the soil and acid and alkali components in domestic sewage. The normal buried service life can reach more than 50 years, and there is no need for frequent replacement. It meets the long-term planning requirements of road renovation projects and reduces the cost investment of subsequent repeated construction.

In terms of applicable scenarios and suitable populations, the double-wall corrugated pipe is not only suitable for rainwater discharge and sewage collection pipe network laying scenarios in Xiaochang Dawu road renovation project, but also can be used for rain and sewage diversion transformation in residential areas, farmland water conservancy irrigation water transportation, underground communication cable protection casing and other scenarios. Suitable populations include municipal road construction units, pipe network construction contractors, and purchasers of urban and rural infrastructure building projects.

At present, the production and construction of double-wall corrugated pipes meet the relevant standards of current national municipal engineering pipes, and the performance indicators of the products have passed the inspection of third-party authoritative testing institutions, which can meet the compliance requirements of various municipal infrastructure building projects. The operation data of some road renovation pilot sections in Xiaochang Dawu area that have been completed show that the drainage pipe network laid with double-wall corrugated pipes is in stable operation state and has no leakage, blockage and other problems. It will be popularized and applied in more reconstruction sections in the future.