The most commonly used connection methods for HDPE corrugated pipes include the following. Select the appropriate method based on project requirements, pipe diameter and construction conditions:
Rubber ring socket connection
Socket-and-spigot connection is the most commonly used connection method for PE corrugated pipes. One end of the PE double-wall corrugated pipe is made into a socket and the other end is a spigot. There are two ways to form a socket on the corrugated pipe:
Expanding molding method
The double-wall corrugated pipe is first formed, and then one end is locally heated and expanded into a socket after it comes off the line. The advantage of this method is that the socket part is a structural wall with good rigidity and reliable connection.
Expanding molding method
The corrugated pipe is first formed, and then one end is locally heated and expanded into a socket after it comes off the line. The advantage of this method is that the socket part is a structural wall with good rigidity and reliable connection.
Socket online forming method
Generally, a pair of special forming mold blocks are used on the corrugation forming machine to directly press the inner and outer layers of the double-wall corrugated pipe to form the socket. When the socket wall thickness and socket length meet the standard requirements, the reliability of the connection is guaranteed, and the produced pipe is formed in one step, and the quality is more guaranteed.
In actual operation, turn the rubber ring to the first or second groove of the pipe socket, and apply lubricant to the inner wall of the socket and the rubber ring of the socket before inserting it, to ensure that at least 4 grooves are connected to the socket. If the outer diameter exceeds 400, the pipe joint can be pulled into place by two hand hoists. When closing the interface, the hand hoists on both sides of the pipe joint need to be pulled together to make its sealing ring in the right position to ensure that it will not be twisted or fall off.
In order to prevent leakage in the double-wall corrugated pipe drainage system, the socket of the corrugated pipe needs to be placed upstream of the drainage system, and the plug needs to be placed downstream of the drainage system, so as to ensure that the connecting part of the pipe will not leak.
Heat shrink sleeve (belt) connection
This connection method overlaps the fiber-reinforced heat shrink sleeve at the joint. After cross-linking, the polyethylene forms cross-linked bonds between the molecular chains to form a three-dimensional network structure. This structure significantly changes the stress cracking resistance, wear resistance, deformation resistance, chemical resistance and low temperature resistance, making it have good insulation, corrosion resistance, sealing, waterproof and other characteristics.
When constructing this method, attention should be paid to waterproofing, and space for heating operations should be left in the groove at the interface. Heat shrink sleeve connection is mostly suitable for application scenarios with high requirements for waterproofing and corrosion resistance.
결론
The above two are the two mainstream connection methods on the market. In addition, there are also Haff external fixed connection and sleeve pipe connection, but due to the high cost and limitations of the use environment, they are not commonly used.
