Oxidation reaction tank expansion joint Leakage plugging, leakage pool, crack repair

Water leakage of expansion joint of oxidation reaction tank, plugging of cracks in leakage tank, and leakage repair

1. The self waterproof function of the structure is emphasized unilaterally, and no flexible additional waterproof layer is set. Structural concrete is a kind of heterogeneous composite material composed of several materials. There are many pores of different sizes inside, which are usually seepage channels. Even though the compactness of the concrete itself for waterproofing and plugging in Longhu Town has been improved by various means, the rigid structure still cannot resist the effects of external forces such as earthquake, temperature difference deformation, uneven settlement, etc., resulting in cracks in the structure and forming leakage channels.

2. For basements of some projects, no waterproof layer is designed for the baseplate, or the baseplate is used for internal waterproof, but only the waterproof layer is set on the exterior facade of the enclosure wall, Waterproof roll It is not uncommon for the witness sampling table to cause that the waterproof layer does not intersect and cannot reach the overall sealing state, resulting in leakage.

（2） Material causes

1. The raw materials of waterproof concrete are poorly selected, cement The grade is too low, overdue caking, the aggregate particle size does not meet the requirements, the mud content is too large, and the quality of the admixture is unqualified.

2. Improper material selection of flexible additional waterproof layer. For example, ordinary paper based linoleum or jute based linoleum with poor durability are used; The thickness of waterproof coiled material used is too small, which is not durable and easy to be damaged; Emulsion type waterproof coating coating , due to long-term immersion in the ground be launched In the middle, the film deteriorates due to re emulsification and loses its waterproof ability; When synthetic polymer coiled material is selected, the matching adhesive is not used.

3. The higher the grade and impermeability grade of concrete used as structural self waterproofing, the more cement is used per unit volume. As a result, a large amount of hydration heat accumulates inside the concrete. During the cooling process, the concrete shrinks due to temperature difference, causing cracks in the structure; In addition, at present, the basement structure mostly adopts pumping highly impermeable concrete, and the unit cement consumption and water cement ratio are large, resulting in dry shrinkage cracks in the structure.

4. Other reasons,

The construction unit uses inferior waterproof materials or jerry built materials. If the thickness of the film waterproof layer is too thin to meet the requirements, it will not play a waterproof role.

（3） Construction reasons

1. Poor foundation treatment leads to uneven settlement of buildings, resulting in structural cracking and damage of waterproof layer.

2. The construction quality of waterproof concrete is poor. The concrete mix proportion and water cement ratio are not strictly controlled, the vibration is not solid, the maintenance is not complete, there are honeycombs, pitted surfaces, holes and other problems, resulting in the basement structure concrete is not dense, and there are many leakage channels.

3. The construction quality of flexible waterproof layer is poor. Including that the base course is constructed before meeting the requirements, and the corners are not strengthened; Improper treatment of through wall pipes, embedded parts, deformation joints and other parts, and poor bonding between coiled materials and coiled materials.

4. The coating waterproof layer adopts the construction of external waterproofing and internal brushing method As the strength of the film is low and it is firmly bonded to the protective wall, when the main structure subsides, it is easy to crack the waterproof layer of the film and cause leakage.

5. The backfill contains garbage, broken bricks and other sundries, or is not compacted to form a waterproof curtain, forming a catchment area around the basement. When the structure and waterproof layer have problems, water leakage will occur.

Quotation IV) Management reasons and other factors

1. Poor management, unreasonable construction process arrangement, random opening and pipe burying on the side wall or bottom plate with waterproof requirements, but not careful waterproof repair treatment, resulting in leakage.

2. Leakage is caused by structural damage caused by non-human factors such as earthquake.

2、 Governance method ：

1. Surface method:

It is applicable to the treatment of large-area leakage of structures. Generally, the treatment and burial of large area seepage water in the basement cannot be carried out on the upstream surface, but only on the downstream surface. Therefore, before construction, water diversion and drainage should be carried out to prevent the newly made waterproof surface from being damaged by pressurized water. The specific method of surface layer method is: select the location with concentrated leakage, open holes and bury pipes to make water flow out of the conduit. According to the amount of water leakage, pipes can be buried at one or more places for water diversion. If no leakage point can be found, pipes can be buried at the lower part of the wall for water diversion. Then, according to the material use requirements, large areas of polymer cement waterproof mortar shall be coated on the watertight parts, which shall be plastered and compacted layer by layer, in the order of waterproof plain mortar - waterproof mortar - waterproof plain mortar, and then pull the pipe to block the water. For slight water seepage of concrete, inorganic quick setting water stop material can be applied to the concrete surface, and rubber gloves can be worn to rub repeatedly until no water shadow is seen. For obvious seepage Leaky Holes and cracks, treated as leakage water of holes and cracks method Water stop treatment shall be carried out one by one. For the surface of the concrete structure of the basement, when there is not serious slow water leakage with small water pressure (such as sweating, moisture absorption, etc.), the polymer cement paste can be applied on the back surface to form an impermeable covering layer on the surface, which plays a role in seepage prevention. The specific method is as follows: the surface of the base course shall be treated flat and smooth, the uneven places shall be filled with cement mortar, compacted and trowelled, and the dust and oil stain on the surface of the base course shall be removed at the same time, so as to facilitate the bonding of the waterproof layer. After the above work is completed and inspected as qualified, the selected polymer cement plain slurry can be coated according to the instructions.

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How to deal with leakage at the plugging price is also a combination of three schemes: plugging/drainage/plugging and drainage, which can be divided into traditional plugging methods and chemical grouting methods.

1. The traditional method of leak stoppage is to chisel the crack or leakage place to conduct surface leak stoppage, but the result is often to plug here, and then start to leak there. Because water can move irregularly in the cracks inside the concrete and seep out from the relatively weak parts.

2. Chemical grouting generally refers to injecting grout prepared by chemical materials into structural cracks by drilling holes and embedding grouting nozzles, so as to diffuse and solidify them and achieve the purpose of waterproofing, plugging, reinforcement and reinforcement. It is often used to repair deep cracks in concrete structures. According to the pressure and speed of grouting, it can be divided into high-pressure rapid grouting method and low-pressure slow grouting method. At present, chemical grouting method has been widely used in dam foundation, foundation reinforcement and seepage prevention, underground tunnel excavation, concrete defect repair and many other engineering fields.

3. For water leakage, it is advisable to cut a circular groove along the pipeline from the upstream surface, clean it, embed sealing materials, and level it with polymer cement mortar,

Flexible film waterproof layer shall be applied within 250mm.

4. If it is impossible to control from the upstream, the circular groove can be cut from the back surface along the pipeline periphery, cleaned up, and the grouting nozzle can be embedded in the circular groove with quick setting plugging material, and the polymer chemical grouting material can be poured to stop the leakage and stop the water; After no leakage is found through inspection, the sealing material shall be embedded and leveled with polymer cement mortar, and a flexible film waterproof layer shall be set.

5. Expansion joints shall be embedded with water swelling waterstop.

Water leakage of expansion joint of oxidation reaction tank, plugging of cracks in leakage tank, and leakage repair