River tunnel waterproofing materials and river tunnel waterproofing construction plan
General tunnel waterproofing construction plan
1. Construction tools: special hot-melt spray gun and blowtorch, high-pressure hair dryer, pressure roller, measuring tape, elastic cord, electric mixer, material bucket , roller brush, small flat shovel, wallpaper knife and fire-fighting equipment.
2. Supporting materials: base treatment agent (cold base oil), coil adhesive, industrial gasoline, etc.
3. Construction method
Hot-melt method: A construction method that uses professional hot-melt equipment or a blowtorch to bake the bottom layer of materials in a near-melted state for bonding. The thickness of hot melt coil should be >3mm. Full melting: The bottom of the coil is completely melted. It is generally used for bonding between coils and coils, and can be used for bonding with the base layer under special circumstances.
Cold bonding method (cold construction): Adhesive is used to bond the coiled material to the base layer. Under normal circumstances, the spot bonding method is used.
Cold bonding and hot melting method: refers to the construction method in which the roll material and the base layer are cold bonded, and the roll overlap, closing, special-shaped parts and facade construction adopt the hot melt method.
4. Process flow: clean the base layer and apply base treatment agent (cold primer) to the special-shaped parts of the reinforcement layer to determine the direction of paving, spread the base line over a large area, seal the rolled material, close the head, repair, and self- Inspection and inspection.
5. Construction points
The construction base should comply with the requirements of national specifications, the leveling surface should be compacted and flat, and the drainage slope should meet the design requirements. Special-shaped parts should be rounded according to regulations. Or eight-shaped slope, after smoothing with cement mortar, it should be calendered twice and fully maintained, and there should be no looseness, sanding or peeling. The base layer should be dry and the moisture content should not be greater than 8%.
The base treatment agent should be consistent with the properties of the coiled material, and the base treatment agent should be applied evenly.
Treatment of special-shaped parts: Make additional layers for special-shaped parts according to the specification requirements. The width and material of the additional layer are required to meet the design requirements and are constructed using the hot melt method.
Rolled material paving requirements: Paving direction: When the slope of the layer is ≤3%, it should be paved parallel to the ridge direction. The slope of 3%-15% can be freely selected according to the site conditions. When the slope is ≥15%, it should be vertical. Pave in the direction of the roof ridge. Laying order: The connected levels should be high span or bottom span. For the same layer, first lay the reinforcement layer for rainwater outlets, parapets and other special-shaped parts, and then lay a large-area waterproof layer. When the exterior-proofing method is used in the basement, the flat surface should be laid first and then the facade. When the exterior-proof internal sticking method is used in the basement, the roll material should be laid first on the facade and then on the flat surface.
All roll overlapping and closing hot melt construction requires the extrusion of an asphalt strip to ensure the tightness of the waterproof layer.
If the self-inspection is qualified, the cleaning site shall be submitted for acceptance.