1 The bridge deck should be flexible and waterproof, and it is not appropriate to lay a rigid waterproof layer separately. Coatings, coiled materials, adhesives and auxiliary materials used for bridge deck waterproof layer must meet the requirements of environmental protection.
2 The waterproof layer of bridge deck shall be constructed after the cast-in-place bridge deck structure concrete or cushion concrete reaches the design strength and is accepted.
The waterproof layer of bridge deck should be directly laid on the concrete surface, and mortar leveling layer should not be added between them.
4 waterproof base surface should be solid, flat, smooth and dry, and the angle of yin and yang should be made into an arc according to the specified radius. Before the waterproof layer construction, the floating dust and loose materials should be removed, and the grass-roots treatment agent should be painted. The basic treatment agent should use materials that match the performance of the coil or coating. The coating shall be evenly and completely covered, and the waterproof layer of coiled material or coating film shall penetrate into the base, and the surface shall be dried before application.
Waterproof coiled material and waterproof coating should have high elongation, high tensile strength, good elasticity and plasticity, high and low temperature resistance and aging resistance. Waterproof coiled material and waterproof coating should meet the current national standards and design requirements.
6 When the hot-laid asphalt mixture is used as the wear layer on the bridge deck, waterproof coiled material and waterproof coating such as polymer modified asphalt with high temperature resistance of 140 ~ 160℃ should be used.
7 bridge deck waterproof layer should be full paste method; The total thickness of waterproof layer and the number of layers of coiled material or carcass should meet the design requirements; Kerbs, ground coverings, deformation joints, sinks, drains, etc. should be strengthened locally according to the requirements of design and waterproof specifications. The waterproof layer must be firmly bonded and tightly closed with the sink and drain.
8 After the waterproof layer is completed, the finished product protection should be strengthened to prevent the waterproof layer from being crushed, punctured and scratched, and the bridge deck pavement should be laid after timely acceptance.
9 The waterproof layer is strictly forbidden to be constructed in rainy days, snowy days and windy weather above Grade 5 (inclusive), and it is not suitable for construction when the temperature is below -5℃.
10 coating waterproof layer construction shall meet the following requirements:
1) After the base treatment agent is dried, the base reinforcement can be laid with waterproof coating. Coating waterproof layer should be firmly bonded with the grassroots.
2) The carcass material of coating waterproof layer should be overlapped in the direction of running water, and the overlapping width should be not less than 50㎜ for the long side and 70㎜ for the short side. The overlapping seam of upper and lower carcass should be staggered by 1/3 width.
3) After the lower layer is dried, the upper layer can be constructed, and each layer of coating should be uniform in thickness and smooth in surface.
1 1 The construction of coiled material waterproof layer shall meet the following requirements:
1) Adhesive should be matched with coiled material and primary treatment agent, and can only be used after passing the sampling inspection after entering the site.
2) After the treatment agent at the grass-roots level is dried, it can be coated with adhesive, so that the coil can be firmly bonded with the grass-roots level, and the coil between layers should also be firmly bonded, and the coil can not be folded or folded.
3) The coiled material shall be laid along the direction of the bridge, and overlapped along the direction of flowing water from the lowest edge. The lap width of the long side should be 70 ~ 80 ㎜, the lap width of the short side should be 100㎜, and the staggered distance between the upper and lower layers should not be less than 300㎜.
12 waterproof adhesive layer construction shall meet the following requirements:
1) The varieties, specifications and properties of waterproof bonding materials shall meet the design requirements and current national standards.
2) The adhesive layer shall adopt high-viscosity modified asphalt and epoxy asphalt waterproof coating.
3) The ambient temperature and relative humidity during the construction of waterproof adhesive layer shall meet the requirements of the product manual of waterproof adhesive material.
4) Strictly control the heating temperature and paving temperature of waterproof adhesive layer materials during construction.
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