Causes and repair of leakage in the basement of th

2022-08-23
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As we all know, there are many reasons for water seepage and leakage in the basement of buildings, but I think the most fundamental reason is people's understanding and attitude towards waterproof construction

first of all, it is recognized that for underground concrete engineering, it is considered that the temperature changes little and the concrete will not crack and leak water for a long time. Even if there is a little water seepage, there is no problem to plaster a waterproof mortar inside. And it is believed that waterproof agent and expansion agent have been added to the concrete, and Waterstops have been set in key parts. How can it leak? What's more, there is a layer of elastic external waterproof in the basement? So you can rest easy

based on the above understanding, the concept that "once there is leakage in the basement, it is difficult to repair" is thrown out of the sky. You don't really realize that when you are making the outer waterproof layer, there are a series of problems, such as whether there are joints, whether the waterproof layer is firmly bonded, whether the selected waterproof materials meet the waterproof needs of the project (including the influence of water quality factors, geological factors and other surrounding environmental factors, etc.) and whether they are damaged during the construction process. It is not considered that part of the pores of the concrete will penetrate under a certain water pressure after hydration. Even if waterproof agent and expansion agent are added, the creep of the concrete will bring some cracks and leakage, while waterproof agent and expansion agent can only enhance the hydrophobicity and compactness of the concrete, and can not solve the problems of leakage caused by cracks caused by heat rise and cold contraction and foundation settlement. Therefore, it is very important to strengthen people's understanding of the causes of leakage. As long as you recognize it, master it fundamentally, use it, and summarize the regularity, you will turn the door on leakage

the second is attitude. In the process of waterproof construction, because environmental factors will bring some adverse effects, the construction personnel have the idea of coping temporarily, only talking about the construction speed and operability, ignoring the quality of waterproof engineering, which creates a potential leakage source for the engineering project. When the environment changes, water will penetrate from these hidden points, bringing immeasurable losses to the waterproof engineering

for example, after the completion of the sewage treatment tank project of a plant in Laixi, water was stored in the tank. As a result, there was serious leakage around the tank. After many times of repair, the effect was not obvious. Finally, the five demands were also increasing day by day. After removing the waterproof plaster, it was found that during the waterproof treatment, the construction personnel did not pay attention to waterproof ideologically, overstaffed people, and casually stuffed the mixture of cement and plastic woven bags in it, The combination of the bottom plastering and concrete with the five side waterproof layer is not good enough, so that the water flows between the bonding layers and flows to the outside of the pool through this hole, resulting in leakage. This phenomenon is particularly prominent in underground engineering. Therefore, from this perspective, the cause of basement leakage also lies in people, their understanding and attention. Therefore, strengthening people's understanding and correcting their working attitude is also an important way to solve the leakage

in theory, the leakage in the basement is not difficult to repair, it is simply to carefully check the appearance of waterproof concrete 1. Select the manufacturer, and first look at the wall to see if there are honeycomb, pitted surface, holes, exposed ribs and other defects that affect the quality of the project, whether the detailed structure is handled properly, and whether the waterproof layer forms a whole. Whether the leakage point is found at the leakage position? If these works are done well, the leakage can be stopped and waterproof treatment can be carried out. At present, the commonly used materials for plugging include waterproof treasure, plugging energy, plugging spirit, guaranteed time and other inorganic waterproof materials. For projects with complex cracks, the methods of drilling and embedding nozzles and pressure grouting can be adopted, and the materials can be acrylamide, cyanoagulation, epoxy resin and high water rapid solidification filling materials for repair until there is no leakage. In the actual repair process, although there is a correct theory for guidance, the key problem is to fully combine the theory with field experience to achieve the ultimate waterproof purpose

next, we will discuss and study with you the basement with different methods of plugging treatment through the actual situation of several projects

I. rigid waterproofing

rigid waterproofing is most suitable for unchanged projects, which has been practiced for many years. For the basement without plastering layer, it is much easier to do it directly on the original concrete. Most of these projects have not been completed after the main body is up. When the groundwater rises or the backfill is filled, the transformation from traditional product manufacturing to the provision of products and services and overall solutions will soon be accelerated, resulting in leakage. Most of these leakage parts appear near the joint belt and corners, and very few holes and honeycombs appear. Some places have sediment, which is mostly caused by the poor construction environment and the lack of care of construction personnel. But it is much easier to maintain than to make a surface course. For projects like this, use a chisel to remove the loose places at the leakage point directly, find out the leakage point, chisel it into an eight shaped shape, and then use a waterproof treasure (or other quick setting waterproof materials) to level it around. After it is dry, add an appropriate amount of supporting accelerator into the waterproof treasure, mix it evenly, and plug it to the leakage point, so it is OK. Such as the basement of Qingdao Submarine Academy

however, if there are many cracks in the basement, it should not be treated in this way. Because most of these projects are quality problems, ① the concrete grade is not enough (or the design cannot meet the waterproof strength requirements). ② Insufficient reinforcement. ③ The mixing of concrete admixtures is unreasonable. ④ The amount of water added to the concrete is too large. ⑤ Lack of maintenance and other reasons. In this case, if you use the above methods to stop the leak, you are blocking the leak at a, B, c... you can't handle it well. Therefore, grouting method should be adopted to reinforce the concrete and reinforce the concrete. The materials used are rigid and elastic. Rigid materials are used for static cracks, and elastic materials are used for fretting cracks. In addition, the applicable conditions should also be considered, such as the wear resistance of materials used on the ground (sidewalk) and where vehicles are running

II. Rigid waterproof and coiled material waterproof composite

when lifting coiled material waterproof, people will always think of SBS, app, ethylene propylene diene monomer and other materials. However, we use a kind of polyethylene non-woven double-sided composite coiled material in operation. Although the thickness of this coiled material is not as thick as the above, it can be used for damp operation and repair of basement leakage, and it still has a certain effect

the basement of Fuyuan community on Jiangxi Road in Qingdao has serious leakage. There is water all year round, and the wall is slow to seep. Therefore, we chose waterproof treasure to be used in combination with this material. During construction, we first find out the leakage point and block it with waterproof treasure. For sweating walls and other positions, we directly use scratch waterproof treasure to paste, which overcomes the phenomenon that the coiled material is not firmly pasted with cement on sweating walls, Finally, a layer of ordinary mortar plastering is made on the surface, and the result is very good. So far, there is no leakage and moisture return

III. combination of rigid waterproofing and film waterproofing

several basements of FAW Daewoo (Yantai) Engine Co., Ltd. have been waterproof treated for many times, and leakage does not stop in rainy seasons. Some places are below the water level, so the wall water comes out all year round. In this project, it can be said that many advanced rigid waterproof materials at home and abroad are collected, but the waterproof effect is not significant. Faced with such a project, after many studies, it is believed that the waterproof scheme combining rigidity and softness can be effective. For this reason, I should keep the distance between fixtures. We made a field investigation and found that there were more hollows in the waterproof layer on the five sides of the inner waterproof, serious water leakage at the edges and corners, drip lines on the wall, and complex equipment installation in the basement. Therefore, in view of this situation, the flexible material adopts polyurethane waterproof layer, and the rigid material adopts waterproof treasure and RG and a foreign permeable crystalline material, so that they can play their roles in different parts

when starting work, we first plug the places with serious water leakage with waterproof treasure, remove and roughen some empty places, and re plaster and compact them. Then the rigid waterproof layer is scraped again for the whole project, and it is carefully checked again. When there is no leakage for any reason, a layer of polyurethane waterproof is made. When making this layer, the key is to strengthen the root of the embedded iron between the equipment and the concrete, so as to prevent the equipment from shaking and damaging the waterproof layer. Finally, a layer of UEA mortar protective surface is made. The purpose of this is to reduce the cracks of the protective layer (also a kind of rigid waterproof layer), which is beneficial and harmless to the whole project. The waterproof effect after repair is very obvious, and the leakage problem of the basement is completely solved. So why should this project be done like this? In fact, the reason is very simple, that is, there are equipment inside, the construction is complex, the overall effect of coating material molding is good, the polyurethane elongation is long, and the vibration resistance is good. It is difficult to achieve this effect with pure rigid materials. In this project, the previous repair with rigid materials is also one of the reasons for failure

from the above examples, we can see that the repair of the basement is diverse and cannot be stereotyped. We should adjust measures to local conditions, find out the causes of leakage according to the project conditions, and formulate corresponding countermeasures and policies. In this way, we will be successful

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