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1. Raw materials comparison
The weight of the same diameter wrapped reinforcing pipe produced by the Clark Tube Equipment is more than 60% heavier than that of the double-wall bellows. In order to ensure its quality flexibility and good weldability, 100% of the new raw materials must be used, so the quality of the produced pipe is reliable and stable. The extrusion process of double-wall corrugated pipe is simple, and the pipe structure is relatively stratified, so the pipe loses flexibility; and the addition of reclaimed material often exceeds 70%, which increases the quality of the pipe instability and vulnerability, changes the pipe flexibility and melt mass flow rate, resulting in the appearance of the pipe is not smooth, and ring stiffness. The tensile strength of the weld is reduced, and the area where the uneven settlement of geology is easy to cause breakage and cracking. Because the recycled material added in the production process is much larger than polyethylene material, it will appear in the market can be bought at a very low price.
2. Comparison of production processes
The winding reinforcing pipe is controlled by computer and cooled by natural wind. The structure wall has no internal stress, no weld, and the pipe wall thickness is uniform. The large diameter pipe produced by winding molding mainly produces DN300mm - DN4000mm, which is strengthened by spiral ribbed pipe, thus greatly increasing the ring stiffness of the pipe. Ring stiffness is more than 20 KN / m2, and the ring stiffness can be continuously adjusted according to the engineering requirements, the maximum depth of burial can reach 20 m.
The double wall bellows are pipes which are directly extruded through two concentric tube embryos and are molded by suction. It is an extrusion process. Because the diameter of the extruded pipe is proportional to the die of the equipment when it reaches a certain diameter, the equipment is developed into a technical problem and the production cost is increased, so the diameter of the production pipe is small, mainly producing DN 600 mm below the pipe, in addition, because the double-wall corrugated pipe is not well composite, it is easy to appear inside and outside the wall when pressed. Layer, and the outer ribbed wall thin, poor mechanical capacity, when squeezed into the depression and other phenomena, so the ring stiffness is low, the larger the caliber, the lower the safety, although there are a few manufacturers can produce DN 1200mm below the pipe, but the actual application cases are not many.
3, ring stiffness comparison
All special-shaped pipes adopt the method of adjusting the moment of inertia (the distance between the center of gravity of the structure wall and the top of the outer diameter of the pipe) to raise the stiffness of the adjusting ring. The inertia distance of HDPE winding reinforced pipes is continuously adjustable, and the inertia moment (i.e. the main PR type of the two layers, the maximum value of the moment of inertia can reach 19.8 cm, and the SQ type can be four. The inertia moments above the floor are greater than 2 * 19.8 cm, so the stiffness of all calibres of pipe rings is high, which can exceed the maximum SN16 (> 16KN /) stipulated in the national standard GB / T19472.2-2004. The stiffness of double-walled bellows under DN600 can only reach S2 (S2 < 8KN /) and above DN800 can only reach S1 (S1 < 4KN /).
4. Comparison of connection modes
The connection mode of the winding reinforcement pipe is "plug-in electric fuse connection". One end of the pipe is a socket with embedded electric fuse, and the other end is a flat wall socket (socket and socket are shown below). During construction, only the socket is put into the socket. When the electric fuse is turned on, the pipe is fused into a whole, and the whole course of the pipe is like a whole dozens of kilometers long. Tube.
Socket welding has the following advantages:
The A and socket are fully fused. The stiffness and strength of the interface are identical with that of the pipe body, and belong to the body connection. When the pipe is deformed by force, the deformation will be smoothly dispersed through the joint to the whole pipe without forming stress concentration at the joint. In complex geological conditions such as soft foundation or beach, the foundation often undergoes uneven settlement. The socket fused wound reinforcement pipe, like a whole pipe, gives full play to its sealing and flexibility, and adapts to geological changes. In geologically unstable areas, buried pipes with frequent heavy loads and socket-and-socket electro-fusion connections have strong impact resistance. This is unthinkable for double wall bellows.
B. The winding reinforcement pipe with plug-in electro-fusion connection can really make the construction quicker, and when there is groundwater and the drainage is difficult, it is easy to collapse in the area and long-term excavation will affect the safety of traffic, buildings and personnel, the HDPE winding reinforcement pipe with plug-in electro-fusion connection can achieve the backfilling while excavating. Because the joint is connected entirely and has strong resistance to stress, the pipeline can be welded at the edge of the groove and put into the groove with a whole section of the pipe. Besides the strict backfilling density required by other plastic pipes, the requirements for the smoothness of the groove, the width of the groove excavation and the slope setting are low, which reduces the excavation amount. And the amount of earthmoving. However, the double-wall corrugated pipe should not only pay attention to the smoothness of groove, increase the engineering quantity, but also adopt the sealing ring connection. This kind of connection uses the material other than polyethylene, which makes the joint leakage or plastic deformation due to the difference of expansion coefficient in the case of large temperature difference in the pipeline system. Flow capacity and tightness. Usually, the anti-aging ability and long life of polyethylene are undeniable, but because the existing double-wall corrugated pipe joints are all made of rubber sealing rings, the anti-aging ability and life of rubber materials are far lower than that of polyethylene materials, and the rubber materials are not corrosion-resistant and easy to aging, and the aging performance is hardening inelastic or non-elastic. Erosion of rubber rings (for example, the world's best sealing rings only last 15 years) will greatly reduce the quality of polyethylene pipeline systems and the life of polyethylene pipeline systems.
5, maintenance and service life comparison
The main material (HDPE) used for winding reinforcing pipes has a life span of more than 50 years, and the plug-in fused connection (i.e. bulk connection) requires no auxiliary material, so the pipeline system has a life span of more than 50 years. The impact (plus the addition of reclaimed materials in the production process, generally less than 15 years), the pipeline system needs to be maintained and maintained more difficult.
Conclusion: By comparing the above two kinds of pipes, it can be seen that the weight, quality and comprehensive performance of the wound reinforced pipes are much higher than that of the double-wall bellows. As a mature product, winding reinforcing pipe has been widely used abroad for a long time, and has been appraised as a key product by the Ministry of Construction in China. It has been widely used in municipal, electric power, wharf, chemical industry and other fields in coastal areas (only the large caliber part in Fujian Province has exceeded 200 km, and has been applied in Shenzhen and Harbin). DN2200 and below pipes. At present, HDPE winding reinforced pipe has been successfully used by Sinopec, PetroChina, China Nuclear Power, Guangdong Nuclear Power, China Aluminum, Metallurgy and other important national projects and industries, as the only new material drainage pipe; China's five major power groups are also widely used in coastal areas. Environmental protection and engineering quality are the concerns of the world, but also human engineering, which requires that these difficult to maintain underground pipelines have stable quality, longer life, high safety, maintenance-free.
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