In the process of waterproofing the basement roof in Chongqing , some reasons for the formation of water leakage in the basement roof were found. Among them, the basement has high waterproof requirements and is difficult to solve. The part of basement waterproofing that has a serious impact and a large impact area is the basement floor. The basement floor is subject to the buoyancy of groundwater, and the commonly used waterproofing method now is the composite waterproofing combining flexible waterproofing on the water front with reinforced concrete self-waterproofing. This external waterproofing technology has the following disadvantages:
① It is difficult to adapt the flexible waterproof membrane to the high-rise building in the durability. The durability of waterproof membrane is much shorter than that of reinforced concrete self-waterproof.
② Once the flexible waterproof membrane leaks water, because the waterproof membrane is located on the water front, it is difficult to repair and even difficult to achieve.
③ Because the waterproof membrane and the basement floor structural layer are not fully adhered, there is a gap, so there is a shortcoming of "a little break, full line failure".
Waterproofing proposes the following solutions to the problem of water leakage in the basement roof:
1. If it is the penetration caused by the concrete is not dense or cracks in the joints of the back cast belt of the bottom plate, the joints can be sealed in sections with epoxy adhesive, and then a high-pressure pump is used to inject water-soluble ammonia into the joints Fat plugging agent (or other water-soluble plugging agent or epoxy filling liquid), the injection amount depends on the other end of the liquid. The product can self-emulsify and polymerize into solid when it encounters water. After curing, it can continue to swell in the presence of water, and play a role in stopping water and plugging.
2. For the water seepage at the sporadic point, the electric hammer drill can be used to fill the waterproofing agent to achieve the effect of plugging and preventing seepage. Specific method: Use an electric hammer to drill one or several holes with a diameter of 25 mm at the water seepage location, and the depth depends on the thickness of the bottom plate. After punching the holes, clean the holes, moisten them with water, and mix the powdery water-repellent (such as plugging agent) with water at a ratio of about 1: 8, insert them into the holes, and compact them with steel bars. Plugging effect.
Roof waterproofing has always troubled many residents. After so many years of development in building technology, even now, water leakage problems often occur. Why do developers leak water when they do waterproof work? How to make waterproof technology a new step is a very meaningful thing.