Water leakage from expansion joints will first reach the negative floor. Reasons for water leakage in expansion joints:
1. The waterstop is buried in an inaccurate position
The positioning is inaccurate. The waterstop is twisted and deflected and severely out of position when buried. The hollow ring in the middle of the waterstop does not coincide with the center of the expansion joint, which affects the ability of the waterstop to adapt to deformation. In addition, if the fixing method is improper, the waterstop is often not firmly fixed.
2. The waterstop is not tightly combined with the concrete on both sides
When installing a horizontal waterstop on the bottom plate, the concrete under the waterstop is difficult to vibrate and compact, and honeycombs often appear. , pockmarked noodles. In addition, the water between the waterstop and the concrete evaporates, leaving a gap that becomes a water seepage channel. When pouring concrete on both sides of the vertical expansion joint, the vibration is not dense.
Extended information:
How to deal with water leakage in building expansion joints:
1. Check the location of the leak: If you want to fundamentally solve the problem, you must first find out Cause of water leakage. First, you need to check whether there is leakage in the expansion joint itself, or there is a problem with the waterstop, or the original waterproof layer is damaged.
2. If there is leakage in the expansion joint itself, you can first use ointment to fill the joint. This method is only suitable for leaks with small gaps and minor leakage problems.
3. Water-swelling waterstop strips can be placed and fixed with cement nails close to the chiseled surface. Reinstall the stainless steel water-stopping steel plate at the original expansion joint location according to the original drawings.
4. If the waterproof layer is damaged, the waterproof membrane needs to be re-paved to avoid greater losses. Remember to clean the base surface during construction, as it will be difficult to construct on rainy days.
5. Lay the extruded polystyrene board, and then pour the concrete again. The concrete should be higher than the original level, vibrate and compact, follow the post-casting belt processing requirements, and maintain it.
6. Grouting is used directly in small areas, commonly known as injection, which means using a grouting machine to plug leaks. The principle is that grouting can penetrate the concrete layer and fill the gaps.