How to deal with the leakage of underground garage connecting crack According to the actual situation of the project, our company first needs to carry out waterproof grouting and plugging for the crack leakage parts, then carry out the flexible waterproof layer, and then carry out the rapid plugging and flexible rigid waterproof protective layer construction again. The waterproof and leakage blocking scheme of rigid protection and flexible waterproof is carried out according to the requirements of the National Technical Code for Waterproofing of Underground Works.
1、 Process principle:
1. The basic principle of the waterproof and leak stopping method is chemical grouting. Chemical grouting is to use manual or mechanical means to plug leakage with water. Under the pressure, special chemical grouting materials are poured into the cracks of the building structure to solidify the grouting materials in the cracks, so as to fill the cracks and stop water.
2. Through cracks can be treated by sealing, burying pipes and chemical grouting. For non penetrating fractures, it is difficult to inject grout into the crack tip area due to the gas tight relationship, so the stress concentration area formed in this high area cannot be eliminated. Therefore, various factors should be carefully considered in the treatment to improve the grout filling rate. For temperature cracks, considering the "lag effect" of concrete buildings on air temperature, grouting is generally selected at the low point of concrete body temperature to block the leakage water, with good results.
3. Grouting is a new chemical grouting plugging technology, which uses double liquid grouting. The three kinds of raw materials weighed in proportion are added with water and stirred to make liquid A, and the sulfur fixation weighed in proportion is added with water and stirred to make liquid B. When the two kinds of liquids are mixed, polymerization reaction occurs. The initial setting is 30 seconds, and the reaction is completed in 2-3 minutes, and the final setting is colloidal. The grouting is injected into the structural layer in the form of water solution, the slurry viscosity is low, the permeability is good, and the crack below 0.1mm can be injected; The slurry can agglomerate under the conditions of humidity, high water speed and large amount of water; The gel also has good impermeability, water expansion, corrosion resistance and other characteristics. The compressive strength of the gel is 0.01-0.06MPa, and the tensile strength is 0.02-0.04MPa.
4. Grouting method is mainly used for large water leakage and dispersed water flow, which is not conducive to sealing cracks and individual water outlet points and surfaces. Determine the plugging position according to the crack condition. Carry out internal grouting to seal the water channel and cracks, or make the water flow relatively concentrated, so as to facilitate plugging. For centralized water outlet points with water leakage greater than 150mL/min, water diversion grouting method shall be used for water plugging. At the outlet first drill hole The drilling height should not penetrate the structural layer and should not be less than 20cm, which can not only avoid the super diffusion of grout during grouting, but also dredge the surrounding water outlet Packing Staggered tiny cracks play the role of pressure relief. Then clean the crushed stone floating debris in the hole, and use quick gel mud to clean the plastic with an outer diameter of 25mm Hose Buried in the diversion hole, and then mortar Trim the mouth.
2、 Process characteristics:
The waterproof plugging scheme of rigid protection and flexible waterproof can effectively solve the joints of concrete structures in underground works, Construction joint , deformation joints, honeycombs and pockmarks, concrete shrinkage cracks and other water leakage, water stop, waterproof leakage repair effect is remarkable.
1. The construction process is simple and effective, and the equipment is compact, which is not limited by the size of the waterproof repair construction site.
2. The waterproof construction grouting materials and caulking materials currently used in the waterproof plugging method, such as oil soluble and water soluble grouting materials, 821BF water swelling rubber, 888 bentonite caulking glue, etc., have reached the domestic advanced level, and some have reached the international level.
3. In the waterproof and leak stoppage method, special processes and materials can be used to reinforce the concrete cracks, especially for the small cracks caused by the shrinkage of the large area of poured and tamped concrete.
3、 Large area leakage treatment scheme:
1. Surface layer method: applicable to the treatment of large-area leakage of structures. Generally, the treatment of large area leakage 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 water. For slight water seepage of the concrete, the compressive plugging spirit can be applied to the concrete surface, and the scraper can be used for construction. Generally, the construction shall be conducted for 2-3 times until no water shadow is seen. For holes and gaps with obvious water leakage, water stop treatment shall be carried out one by one according to the method of hole and crack leakage water treatment.
For the surface of the concrete structure of the basement, when there is not very serious slow leakage with small water pressure (such as sweating, moisture absorption, etc.), anti leakage grams can be applied on the back surface to form an impermeable covering layer on the surface to play the role of seepage prevention. The specific method is as follows: the surface of the base course shall be treated flat and smooth, the uneven parts shall be filled with cement mortar, flattened and trowelled, and the dust and oil stain on the surface of the base course shall be removed to facilitate the bonding of the waterproof layer. After the above work is completed and inspected as qualified, the anti leakage gram can be used for construction.
2. Grouting method: grouting method can also be used in case of large area leakage in the basement. According to the leakage situation, grouting holes can be arranged on the structure, which can be arranged in plum blossom, triangle or straight shape, and then grouting treatment can be carried out to form a waterproof curtain inside the structure. In addition, the method of "surface sealing grouting" can also be used, that is, first lower the pipe for water diversion, and then use the quick plugging spirit to plaster a large area. After the strength of the waterproof coating meets the requirements, grout from the water diversion pipe for water plugging.
4、 The construction steps of waterproof and leakage blocking and structural reinforcement are as follows:
1. First chisel a 70mm deep and 60mm wide "V" joint at the construction joint and flush it with water.
2. Fix the grouting channel and grouting pipe, and fix the PE foam strip of the grouting channel with the quick plugging spirit. When fixing the PE foam strip, a grouting pipe shall be buried every 50cm or so, and the grouting pipe shall be 10~13mm pressure resistant rubber hose, which is used as both the water diversion pipe and the grouting pipe.
3. Grouting for leak stopping and water stopping and polysulfide flexible sealing waterproof construction. Polymer grouting material (grouting for leak stopping king) shall be injected from one side, and the grouting pressure shall be controlled between 0.3~0.5MPa. When the grout comes out from one hole next to the grouting, the grouting can be stopped, and the valve shall be closed before grouting for leak stopping from another hole, and then the grouting shall be carried out in sequence. After all grouting is completed, whether there is leakage shall be observed, If there is still leakage in some places, grouting can be supplemented from the nearest hole until there is no leakage. PG321 two-component polysulfide sealant shall be applied after pipe cutting.
4. For the construction of rigid protective layer, after the waterproof plugging grouting, the cracks will not leak again, and the fast plugging spirit will be used as the rigid waterproof protective layer.
5、 Scope of application:
5.1. Construction, settlement, expansion joints, water leakage, waterproofing and plugging of cracks at the bottom of the pool of expressway, seabed, river crossing, underground * * * tunnel engineering structures.
5.2. Underground foundation construction, subway engineering, civil air defense engineering, sewage treatment tank, bottom plate and other concrete structures leak water plugging construction.
5.3. Water seepage and leakage stoppage construction of various underground works such as basement, underground garage, underground passage, thermal pipeline, foundation pit, etc.
5.4 Construction of construction joints of water pool, cable trench pit, mine passage, elevator shaft and foundation pit works for leakage plugging with water.
5.5. Concrete structure, cooling cooling tower circulation channel, pipeline, sewage treatment tank project leakage water treatment, anti-corrosion and leak stoppage construction.
5.6 Leakage control and plugging construction of culverts, open caissons, pump houses, dams, bridge decks, roofs, tunnels, water intake and drainage works.
5.7. Grouting of reservoir dam body of water conservancy and hydropower projects, leak stoppage and seepage prevention of water conveyance tunnel cracks, and seepage prevention and reinforcement of dam concrete cracks.
5.8. Coal conveying system, coal conveying bridge, drilling, oil well wall protection, and shaft concrete crack leakage water plugging and reinforcement of geological drilling engineering.
5.9. It is applicable to the waterproof and plugging construction of various underground projects, such as the waterproof and plugging of civil air defense basement, underground passage, underground garage and other projects How to deal with the leakage of underground garage connecting crack
