What are the construction conditions of bridge deck waterproofing?

Technical requirements for bridge deck waterproofing construction, including requirements for base treatment. Waterproof material structure and construction requirements, etc.

Deck treatment requirements

(1), the bridge deck should be free of laitance and sundries. Before the construction of waterproof adhesive layer, the cement concrete bridge deck should be sandblasted and finely milled according to the actual situation of the bridge deck to remove laitance and sundries, and remove excessive protruding parts.

(2) The bridge deck should be dry and clean. If the bridge deck is treated, it should be washed with water to ensure that the surface is clean and there can be no visible secondary pollution such as dust and oil pollution. Before the construction of waterproof adhesive layer, ensure that the cement concrete bridge deck is dry and clean.

Deck base cleaning

(1), sand and roughen the bridge deck with shot blasting equipment.

(2) For the foundation surface of concrete bridge deck, firstly, a large amount of gravel and dust are cleaned manually, and loose sundries are cleaned manually. Mechanical equipment such as slag remover and milling machine can be used to treat the bridge deck, and the surface is required to be free of laitance, smooth, clean and clear water.

Construction machinery preparation

(1), road and bridge waterproof coating should be sprayed on a large area with a sprayer at room temperature. If the construction area is small, hand painting can also be used.

(2) Before construction, the spraying machine and spraying pipeline should be thoroughly cleaned, and before loading this material, it should be thoroughly cleaned, and there is no residue of the previous batch of materials.

(3) Before construction, check the nozzles, and the nozzles are free from blockage, so as to ensure the normal construction process. Spraying machine is forbidden to heat at high temperature and spread cloth at room temperature.

(4) Immediately after spraying, rinse the spraying machine.

Waterproof glue coating?

(1). After the water washed on the bridge deck is dried, it can be sprayed with the special waterproof coating for road and bridge with the spray machine.

(2), should be layered spraying, appropriate points 3 ~ 4 times. The latter pass shall be cured in the previous pass and form a film, and shall be carried out perpendicular to the direction of the previous pass.

(3) The construction temperature shall be 5℃ ~ 35℃. When the temperature is lower than 5℃ and it rains (including rain within 6 hours after construction), construction is not allowed.

Waterproof layer maintenance?

(1), during construction, it is forbidden to trample on the wet operation surface to prevent sharp objects such as nails, wooden sticks and steel bars from damaging the operation surface.

(2) After the waterproof layer is dried, asphalt mixture should be paved as soon as possible. Before paving asphalt, the method of spreading fine asphalt mixture on the surface of waterproof layer can be used as isolation layer to prevent the coating from being damaged.

The above is Song Xiao's simple acceptance of bridge deck waterproof construction conditions. If you don't understand anything, you can pay attention to Song Xiao and answer your questions at any time!