Construction Points of CPVC Cable Protection Pipe in Municipal Weak Current Engineering

Key points for verification of type selection before construction

The entering CPVC cable protection pipe needs to first check the wall thickness parameters, match the pressure requirements of the underground laying of the municipal weak current project, and check the appearance of the pipe one by one for cracks, bubbles, depressions and other defects. Different specifications of pipes are stacked in different categories to avoid high temperature exposure areas to prevent deformation. At the same time, it is necessary to check the product insulation performance and acid and alkali corrosion resistance test report to confirm that it meets the municipal underground complex environment use standards, and prevent unqualified pipes from entering the market.

Requirements for trench excavation and pipeline laying

The trench excavation depth of the weak current pipeline must comply with the municipal road pipeline planning standards. After the bottom of the trench is cleaned and leveled, a 3-5cm thick fine sand cushion is laid to completely remove sharp stones, metal residues and other hard objects to avoid scratching the outer wall of the pipe. Keep the CPVC pipe straight when laying, and make a circular arc transition in the turning area. The radius of curvature is not less than 15 times the outer diameter of the pipe to prevent late threading. When laying multiple pipes in the same groove, reserve a gap of more than 2cm between the pipes to avoid extrusion deformation when backfilling.

Specification for pipe connection and sealing

CPVC cable protection pipe docking is preferentially connected by socket rubber ring. Before connecting, clean up the impurities and burrs of the nozzle. The sealing rubber ring is evenly embedded in the socket groove. After confirming that there is no distortion and misalignment, insert it into the socket. The socket depth meets the product labeling requirements. After docking is completed, check the sealing of the interface one by one, and wrap 2 layers of anti-corrosion tape around the outside of the interface to avoid underground sewage from seeping into the lumen and corroding the cable.

Backfill and later acceptance points

After the pipeline is laid, first backfill it with fine sand to a position 10cm above the top of the pipe, and then layer it with plain soil. It is strictly forbidden to directly backfill large masonry and construction waste to avoid gravitational impact damage to the pipe. After the backfill is completed, carry out a ball test to confirm that the lumen is smooth and free of blockage. Simultaneously draw the pipeline direction map to mark the burial depth and interface position, providing a basis for later operation and maintenance maintenance maintenance.

Standardizing the implementation of the whole process construction control of CPVC cable protection pipes can effectively reduce the risk of external damage and corrosion of weak current pipelines, improve the operation stability of municipal weak current systems, and reduce long-term operation and maintenance costs.