in municipal drainage, residential pipe network and other projects, PE pipes are widely used due to their corrosion resistance and good flexibility, and plastic inspection wells have become common supporting equipment for drainage systems due to their advantages of light weight, environmental protection and easy installation. Many engineers will ask: Can PE pipes be connected to plastic inspection wells? The answer is yes - but to ensure the sealing and durability of the system, the correct connection method and construction details must be mastered.

PE pipes and plastic inspection wells are connected to the feasibility of the material compatibility. Both are made of plastic, the thermal expansion coefficient is close, and the interface will not crack due to inconsistent shrinkage when the temperature changes; and the plastic itself is corrosion-resistant and not easy to age, which can avoid the common leakage and corrosion problems of the connection between traditional brick wells and metal pipes. After connection, an integrated drainage system can be formed to improve the overall reliability.

Common connection method

1. Hot melt connection: This is the most classic connection method of PE pipe, which is suitable for the docking of large-diameter PE pipe (usually De63) and plastic inspection well. During operation, the PE pipe end and the inspection well interface need to be heated to a molten state of 200-230 ° C at the same time, and the pressure is maintained to be completely cooled after quick alignment. Note that the heating temperature needs to be strictly controlled - if the temperature is too high, the material will degrade, and if it is too low, the adhesion will be insufficient, which will affect the sealing effect.

2. Electrofusion connection: The connection is realized by electrofusion pipe fittings (such as electrofusion sleeves), which is suitable for small diameter PE pipes (De63) or scenes with narrow spaces. First, the electrofusion pipe fittings are sleeved at the end of the PE pipe, and then inserted into the reserved interface of the inspection well. After the power is turned on, the electric heating wire in the pipe fittings heats up and melts the surrounding materials to form a sealed connection. This method has high precision and good sealing, but it is necessary to ensure that the pipe fittings match the pipe specifications.

3. Socket connection: Plastic inspection wells usually reserve sockets. Just choose a rubber ring that matches the specifications of the PE pipe. After inserting the PE pipe into the socket, seal the Simple operation, fast speed, suitable for quick installation on site, but pay attention to the installation position of the rubber ring - it must be stuck into the groove of the socket port to avoid displacement and leakage.

4. Flange connection: suitable for parts that need to be disassembled frequently (such as valve wells, maintenance wells). Install flanges at the interface between the PE pipe end and the inspection well, add a sealing pad in the middle, and fasten with bolts. This method has good sealing performance, but the cost is high, and is generally used in special scenarios.

Key considerations

1. Material compatibility: try to use PE pipes, plastic inspection wells and connecting accessories (such as rubber rings, electric fusion pipe fittings) of the same material to avoid chemical reactions or inconsistent expansion coefficients due to material differences, which will affect the life of the interface.

2. Construction environment: The construction temperature needs to be controlled between 5-35 ° C - too low temperature will reduce the fusion effect of hot melt/electrofusion, and too high temperature will soften and deform the material; during construction in rainy or humid environments, the interface needs to be covered with plastic cloth to avoid moisture entering the molten surface.

3. Interface pretreatment: Before connection, the oil, dust and burrs of the PE pipe end and the inspection well interface must be cleaned to ensure that the interface is flat and clean; after hot melt/electrofusion connection, wait for at least 10 minutes for cooling (the specific time is extended with the increase of the pipe diameter) to avoid external force collision resulting in interface deformation.

4. Sealing inspection: After the connection is completed, a closed water test (full water for 24 hours) or a gas pressure test (pressure 0.05MPa for 30 minutes) must be done to check whether the interface is leaking. If leakage is found, it needs to be re-treated immediately, and no flukes should be taken.

5. Post-maintenance: Check the interface status regularly during use - for example, pay attention to whether the interface cracks due to low temperature shrinkage in winter, and pay attention to whether it is deformed due to high temperature expansion in summer; if leakage or damage is found, repair or replace accessories in time.

In general, the connection between PE pipes and plastic inspection wells is not a problem. As long as the right method is selected and the specifications are followed, a stable and reliable docking can be achieved. In the project, it is necessary to choose the appropriate connection method according to the pipe diameter, construction space, and use scenarios. For example, large-diameter pipes are selected for hot melt, small-diameter pipes are selected for electric fusion, and sockets are quickly installed. The key is to put the "details" in place to make the drainage system operate stably for a long time.