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Do you really understand the construction method of polyvinyl chloride (PVC) waterproof rolls?
（1） Construction method for large surface coiled materials:
The large-scale construction methods for PVC waterproof rolls include: ① mechanical fixation method; ② Bonding method; ③ Empty paving (capping) method.
① Mechanical fixation method:
Mechanical fixation method is a construction method that uses specialized fixing components to fix the coil on the base (which can be divided into point fixation and line fixation). Commonly used for some steel roofs, light steel roofs, etc.
② Bonding method:
The bonding method is not difficult to understand. During construction, adhesive is applied to the coil and substrate, and the coil is fixed to the substrate through adhesive bonding. This construction method is commonly used for waterproofing construction of some concrete structures. The bonding method can be divided into full bonding method, strip bonding method, and point bonding method, which involves applying adhesive to the local strip and point areas to bond the coil.
③ Empty laying (covering) method:
The hollow drum paving method is a method that does not apply adhesive on the entire large surface, only adheres and fixes the edges of the construction base within a certain range (usually 800mm), and covers with pressure paving materials. It is commonly used in some concrete structure roofs and other parts.
(2) Lap joint hot air welding construction method:
The treatment method for lap edges of coils is hot air welding.
This welding method is non-contact welding, which uses a welding machine to heat hot air with high heat and a certain wind pressure intensity, heat the upper and lower coils on the overlap surface to melt and flip, and then use tools such as rollers to press and fuse to achieve the welding result.
Commonly used hot air welding machines include but are not limited to: manual hot air welding guns, automatic hot air welding machines, etc.
Hot air welding can be divided into two types based on the number of welds: single seam welding and double seam welding.
In the construction of some civil and industrial engineering such as single-layer roofs and underground structure, the single seam welding method is often used. In municipal and road bridge construction projects such as tunnels, artificial lakes, and landfills, double seam welding methods are often used.