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The application of JS waterproof coating in the emergency treatment of rain leakage in the train house

the application of JS waterproof coating in the emergency treatment of rain leakage in the train house

November 30, 2018

Introduction

railway train houses, such as signal stations, substations, dispatching stations, etc., are internally equipped with important train dispatching equipment, which is an important infrastructure to ensure the production and dispatching command of railway transportation, It is necessary to ensure the good condition and safe use of railway driving houses to promote the harmonious development of society. In case of diseases, it is necessary to organize emergency repair in time and quickly resume use. Among them, the train house leakage disease is the disease that the Railway Housing construction department focuses on. Once the rain leaks, it may lead to the abnormal operation of electronic and electrical equipment, which will directly affect the railway transportation production. Therefore, it is very critical to ensure that the main train house is free of serious rain leakage and can be quickly solved after the rain leakage disease occurs

1 current situation of emergency treatment of rain leakage disease in driving houses

1) affected by weather conditions, there is a problem that the treatment of rain leakage disease is not timely

2) due to improper waterproof material selection, unreasonable construction methods and other reasons, the rain leakage disease cannot be cured, resulting in frequent repair

3) due to the weak bonding with the base, the waterproof layer was lifted by strong wind, and some were blown down the line or contacted by the wind, causing varying degrees of impact on driving equipment and transportation production

2 basic requirements for emergency treatment of rain leakage diseases of driving houses

1) due to the potential serious hidden dangers of rain leakage diseases of driving houses to transportation and production, it is necessary to carefully check before, during and after the rain to find the rain leakage diseases in time. Once found, the treatment of rain leakage diseases must be timely and effective, and it is necessary to make full use of the short time when it does not rain in rainy days to speed up the construction, It is not allowed to wait for the weather to clear up before arranging construction, just like dealing with the rain leakage of ordinary houses. Try to choose waterproof materials that are less affected by weather conditions, can adapt to wet base and can be constructed quickly

2) since most of the main driving houses are close to the existing railway line and railway contact, the selection of waterproof materials and the determination of waterproof construction scheme must ensure that they will not affect the driving and transportation. Waterproof materials with good adhesion and waterproof layers that are not easy to be lifted by sudden winds should be used

3 it is suitable to be used as the necessary characteristics of waterproof materials for the emergency treatment of rain leakage diseases of driving houses

considering the basic requirements for the emergency treatment of rain leakage diseases of driving houses, the waterproof materials selected must meet the requirements of short construction period, simple operation, construction on wet base, good waterproof effect, firm bonding, good durability and environmental protection

4 previous commonly used methods for dealing with house leakage and their disadvantages

the commonly used waterproof coiled materials in railway houses in the past mainly include SBS modified asphalt waterproof coiled materials, polymer composite waterproof coiled materials, asphalt felt waterproof, polyurethane waterproof spraying. These waterproof materials have some disadvantages in the emergency treatment of rain leakage in main railway driving houses, which are briefly described below

the construction of these waterproof materials has strict requirements for base treatment, and the base must be flat, so the base treatment time is long and the construction cycle is long; The waterproof base must be dry and cannot be constructed on the wet base; The bonding strength between the waterproof layer and the base course is not high, so it is easy to clear the torque value in the software, which is lifted by the strong wind, thus affecting the driving; The treatment of edges and corners is complex, and the quality is difficult to control; The hollow part is easy to be punctured by sharp objects, resulting in rain leakage. In addition, the construction of polymer composite waterproof membrane requires compaction and exhaust, which is easier to empty; Asphalt felt waterproof construction is mainly restricted by environmental protection and is not allowed to be used in many places. Spray polyurethane waterproof construction has some disadvantages, such as high construction technology requirements and dry base course

5 characteristics of JS polymer cement waterproof coating

through the comparison of existing waterproof materials, it is found that JS polymer cement waterproof coating can meet the necessary characteristics as a waterproof material for the emergency treatment of rain leakage diseases in driving houses

1) it can be directly constructed and cold constructed on the base surface of wet or dry materials, with simple construction and short construction period

2) the coating is tough and high-strength, firmly bonded to the base, and has good waterproof effect

3) it has good weather resistance and excellent durability. The service life of the four layer waterproof layer is generally 20 ~ 25 years

4) during construction, the waterproof coating can penetrate into small cracks and condense, so that the base can be well repaired

5) there is no need for blowtorch, liquefied gas tank, spraying machine and other equipment, so the construction is safe

6) non toxic, tasteless or slight odor, pollution-free, green and environmental protection

7) it is applicable to a variety of base surfaces and finishes, can penetrate into the base and surface layers of various materials, and is firmly bonded without delamination

8) ceramic tiles, stones and decorative coatings can be directly bonded on the waterproof layer without leveling layer

9) low cost. The consumption of JS waterproof coating per square meter is about 3.5 kg, the unit price of JS polymer cement waterproof coating per kilogram is about 9 yuan, and the material cost per square meter is about 31.5 yuan. Bulk purchase can be greatly preferential, which is 13.5 yuan lower than the material cost of SBS of 45 yuan per square meter. Due to the convenient construction, its labor cost is also lower than SBS and asphalt felt waterproof construction

6 JS polymer cement waterproof coating classification and scope of application

after more than ten years of development, j s polymer cement waterproof coating technology has been very mature, and the country has also specially formulated gb/t JS polymer cement waterproof coating. JS polymer cement waterproof coating is composed of liquid material and powder material. It is divided into type I, type II and type III according to physical properties. Type I is applicable to the base course with a large amount of activities, and types II and III are applicable to the base course with a small amount of activities. Generally speaking, the base course of the roof has a large amount of activities, so type I is suitable. For roofs with small area, stable base and small deformation, type II can also be selected

7 JS waterproof coating construction method

1) base course treatment

repair the cracks and low-lying damages on the surface of the base course to ensure that the surface is flat, solid and free of honeycomb, pitted surface and dust. Remove sharp objects and avoid puncturing the waterproof layer. The internal and external corners and pipe roots of the roof are made into arc angles with R ≥ 15 mm with cement mortar. Use wrapping cloth and program to control arbitrarily, and use a blower to remove the open water on the surface of the base course. The base course with oil stain shall be polished with sandpaper to ensure the surface is clean and improve the bonding strength

2) selection and quality control of JS polymer cement waterproof coating

JS polymer cement waterproof coating that meets the gb/t standard and passes the inspection of authoritative testing units shall be selected. When the construction time is urgent, the waterproof coating with short film-forming time should be selected to shorten the time interval of layered coating. When the purchased JS polymer cement waterproof coating is mobilized, the product certificate, product test report and other quality assurance documents shall be checked. Drinking water shall be used for mixing. Sewage, muddy water and rainwater are strictly prohibited to avoid excessive impurities in the water reacting with powder, thus affecting the performance index of the film

3) reasonable ingredients

there are many manufacturers and varieties of JS composite waterproof materials on the market, and the types of raw materials used and the addition ratio are also different, so the configuration ratio of each component during construction is also different. The proportion of liquid material, powder material and water marked on the product package or instructions shall be followed. Common mix proportion: the ratio of liquid material, powder material and water of the bottom coating is 1:1:1, and the amount of coating is about 0.5 kg/m2 for each layer; The ratio of liquid material, powder material and water of the lower layer, middle layer and upper layer coating is 1:1:0.2, and the amount of coating is about 0.8 kg/m2 for each layer. For the amount of water added, the amount of water can be appropriately reduced according to the roof slope, base moisture content, air humidity and other conditions, so as to ensure the appropriate viscosity of the coating and prevent the coating from flowing and uneven coating thickness

4) construction method

mixing of waterproof coating: in order to ensure the uniformity of mixing coating, portable mechanical mixer should be used instead of manual mixing. When mixing, first pour the liquid material and water into the mixing bucket, and add the powder while continuously mixing with a portable mixer. The mixing time shall not be less than 5 min

waterproof coating brushing: select appropriate brushing tools, such as brushes and scrapers

painting sequence of waterproof coating: complete layer by layer from bottom layer to lower layer, middle layer and upper layer. After the first coating is formed, the next layer of coating is coated. The time interval of each layer is about 1 h ~ 8 h. The specific adjustment should be made according to the weather and environmental conditions, and it is better not to stick to your hands

when coating, ensure that the thickness of each coating is uniform and there is no missing coating. In order to improve the coating speed, block construction can also be carried out, but great attention should be paid to that the joints of blocks should not be missed or the coating is too thick, and the coating interval of adjacent blocks should not exceed half an hour to enhance its integrity

5) construction of matrix reinforcement materials

when JS composite waterproof material is constructed on a large roof, in order to enhance the strength of the waterproof layer, the matrix reinforcement material can be laid after the second coating or before the third coating. The matrix reinforcement material is generally glass fiber cloth or polyester felt. In order to increase the thickness of the waterproof layer, both can be used. The lower layer is laid with polyester felt and the upper layer is laid with glass fiber cloth

there are two construction methods for laying matrix reinforcement materials: dry laying method and wet laying method. The wet paving method is to lay and paste while coating. First, evenly coat the coating on the dried coating, then lay the rolled carcass reinforcement material flat on the roof, and then slowly roll it, so that the reinforcement material can be laid and pasted on the just brushed coating. Roll it with rollers while laying and pasting, so as to ensure that the reinforcement material eye is soaked in the coating

the dry paving method is to flatten the glass fiber cloth on the dried coating, and then apply the upper coating on it. The upper coating is soaked in the glass fiber cloth and fully bonded with the lower coating. In order to ensure the flatness, the edges and center of the flattened glass fiber cloth can be fixed with paint spots

quality requirements: the matrix reinforcement material shall be fully bonded with the lower coating film, without wrinkles, paint missing, hollowing, and the internal and external corners and pipe roots of the roof shall be reinforced

comparison of two methods: using dry paving method for construction, the reinforcement material is easy to be paved smoothly, and it is not easy to have wrinkles and poor bonding, so the quality is easier to control. The wet paving method can directly lay the reinforcement material on the freshly brushed and viscous coating, which is not easy to be blown up by the wind, so it can be constructed in windy weather, but the coating thickness and the overlapping width of matrix reinforcement are difficult to control, which is easy to produce wrinkles that we hope to share our research results in this field. It should be noted that when polyester felt is used as matrix reinforcement, dry paving method cannot be used. During construction, appropriate paving methods can be selected according to the actual situation

6) if the leakage part can be determined, the construction can be directly carried out on the leakage point of the existing waterproof layer, even in special parts such as pipes and holes, which greatly saves construction time

8 precautions

1) before construction, a practical construction scheme should be formulated according to the actual situation, and safety technical disclosure should be made to the construction personnel, so as to complete the construction better and faster on the basis of ensuring safety

2) when dealing with roof corners, pipes and holes, reinforcement measures should be taken. It is best to use glass fiber cloth as matrix reinforcement, and wrap and wrap these parts

3) for accessible roofs, they can be laid directly on the waterproof layer after the construction of the waterproof layer is completed