Answer:
(i) Currently, all multi-story residential buildings in China have foundation-based rainwater collection tanks; therefore, wherever there is severe leakage in the basement, it can be effectively drained into the foundation using a drainage system. However, the design of the elevator pit and mechanical parking pit does not include this drainage system; especially, if the base of the base plate is not thoroughly sealed, installing it recklessly will lead to endless trouble. Moreover, the construction seam formed between the bottom of the mechanical parking pit and the beam of the wall is also the reason for the continuous leakage; if there is a large crack in the bottom of the pit, the water will not be able to drain away, which in turn indicates the negligence in waterproofing the elevator pit and mechanical parking pit. I suggest that when commissioning a new construction site, these two items should be kept separate; they should not be lumped together with waterproofing paint. Please be careful.
(ii) Thoroughly implement repair techniques:
- The original waterproof plaster layer on the ground must be thoroughly removed to the original structure—usually when a builder encounters a leak, they mistakenly believe that by adding another layer of waterproof plaster (or seven-stone plaster), the leak will be “cured”; however, they do not realize that these layers of plaster waste society’s resources and also cause the high cost of subsequent repairs.
- The part caused by structural defects that caused the leakage is punched out, and a quick-drying cement with no shrinkage or a hydrophilic PU foam is used to apply high-pressure injection to seal the leak.
- Apply 2-3 coats of silicate-based penetrating waterproofing material.
- After the water-resistant primer is applied, apply the 1:2 waterproof paint.