Simply Talking about the Causes of Roof Water Leakage and Prevention Measures

Brief introduction to the causes of roof waterproof leakage and preventive measures Wei Li's prevention measures to reduce the leakage phenomenon and improve the quality of waterproofing projects.

1 Causes of leakage 1.1 Objective factors 1) Temperature changes. Most housing materials are subject to thermal expansion and contraction due to changes in temperature. The components of a building also produce expansion and contraction under the effect of temperature changes. When the internal stress generated by the expansion and contraction of some constrained members exceeds the capacity that the members themselves can withstand, they will crack and leak. The surface temperature of the building can reach up to 50*C in summer under direct sunlight, and 0*C when there is a minimum in winter, and the temperature difference can reach 50*C. The reinforced concrete wall with 3.3m general open space is under the condition of temperature difference. , Stretch up to 2mm The larger the opening, the more powerful the telescopic.

Water-proofing is one of the main functions of a building. It plays a role in guaranteeing that the structure of a building is not eroded by water, and the internal space is not affected by water. It has always received widespread attention. With the increasingly complex use of building features, higher and higher quality requirements, more and more waterproof materials, waterproof technology is higher than ever before, and the quality of construction waterproofing projects should be improved. The effective service life of waterproof engineering in developed countries is getting longer and longer, and the guarantee period of waterproof engineering can reach 15 to 20 years and develop to a longer time. The waterproof quality of some important projects in China is also good. However, in the case of large-scale buildings, the leakage phenomenon is serious. Solving housing leakage has become an important work that cannot be ignored.

Do not leave seams in accordance with the requirements of the drawings, and the steel bars were stepped and bent during construction. At the same time, it is necessary to prevent the part of the formwork and pillars from being removed before the concrete is poured, which will result in the formation of cantilever beams and deformation. 5) For the thicker line pipe or multiple line pipe distribution, the vertical line pipe can be reinforced with anti-cracking short steel mesh. The anti-cracking short steel bar should be 6~8, and the span length not more than 150. Less than 300mm.6) Before the erection of the template support in the area of ​​the planned temporary large opening area material lifting and stacking area, it is considered in advance that the use of the encryption pole and the grille to increase the rigidity of the formwork support frame should be considered. The old wooden molds were placed on the concrete surface of the newly constructed area to protect and spread the stress, further preventing the occurrence of cracks. 7) Strengthen the conservation of floor concrete. 8) Strictly control the thickness of the protective layer of negative reinforcement on the board surface: The negative reinforcement of the cast-in-place board is generally placed on the steel bar of the support beam and tied together with the beam reinforcement. In addition, iron bars or concrete pads are used to fix the negative reinforcement. The position ensures that the steel plate no longer sinks during the construction process, so that the protective layer can be effectively controlled, and the crack at the support is reduced due to negative reinforcement, and the thickness of the protective layer is increased. The thickness of the protective layer of the plate should not be greater than 1.5cm2 3 Design For uneven settlement of the foundation, the settlement and settlement difference of the building can be controlled by adjusting the selection of the foundation. For example, deep foundations and foundations can be used to reduce the occurrence of such cracks. 2) Add radiating ribs at the corners of the board. The design of the cast-in-place plate has negative ribs all around, but for most cracks generated at the plate angle, additional ribs are placed around the plate angle so that the direction of the stress acting on the crack is consistent with the applied ribs. Inhibition of cracks, in addition to more reinforcement, relatively speaking, can significantly improve the generation or expansion of cracks, according to the distance from the crack from the plate angle, the laying of ribs length of about 1.5m 3) the layout of the surface to minimize the bump phenomenon and set the necessary Expansion joints. Excessive plane angles, that is, the more weak parts, and these parts due to stress concentration, are often multiple areas of cracks.

3 crack treatment method For the cracks of the general concrete floor surface, you can first clean the cracks, epoxy slurry after drying or sealing with a surface brushing. If cracks are found before final coagulation during construction, it can be applied once and for all. 2) For other general cracks treatment, the board seams can be cleaned with a 1:2 or 1:1 cement mortar, and the joints can be repaired. 3) When the cracks are large, the grooves should be cut along the cracks and rinsed. Employing epoxy mortar can also be used to smooth out with 1:2 cement mortar. 4) When the crack area of ​​the floor slab is large, the static load test of the floor slab shall be carried out to check the structural safety. If necessary, a layer of reinforced mesh may be added to the floor slab to improve the integrity of the slab. 5) Long and open dangerous structural cracks, crack width greater than 0.3mm can be reinforced with structural adhesive flat steel reinforcement, and the board seam is filled with high-pressure glue.

4 Conclusion For some non-structural cracks that are prone to appear on the floor slab of the building roof, many experts at home and abroad have analyzed and researched it, as well as cases of prevention and treatment in actual projects, which have accumulated rich experience. However, to completely eliminate the phenomenon of cracks, it is still necessary to continuously improve the construction technology and accumulate experience, and carry out technological innovation, using more scientific solutions.

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