Hangzhou Plugging Company - basement leakage repair The grouting method is mainly used for large water leakage, 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.
3.1.2 Concrete construction steps of grouting a. Surface cleaning: clean the concrete surface about 10cm around the crack to find the position of the crack and the water source.
b. Cutting or drilling: 3cm to the left and right of the seepage gap cutting machine Cut 6-8cm deep seam to prepare for grooving.
c. Gouging: manually chisel out the groove with a height of 8cm (construction joint) or 6cm (lining crack), generally chisel into an inverted trapezoidal groove with a large inside (6cm) and a small outside (4cm), to ensure that the external waterproof layer is 2-3cm thick.
d. Embedded grouting pipe: for the water leakage between the water supply pipe and the buried casing joint, first chisel the leakage point with a height of no more than 70mm, after washing with water, install hemp rope, and then use plugging materials to plug and embed 1-2 grouting pipes for diversion.
e. Grouting: inject grout from the grouting pipe after the waterproof mortar of the plugging material reaches a certain strength; The grouting effect shall be judged according to the grout flowing out of the corresponding grouting pipe nearby, and the grout shall be filled with gaps and evenly distributed; The grouting pressure is controlled at 0.3-0.4MPa, which is generally determined through on-site testing; After grouting, fasten the grouting pipe orifice with iron wire to prevent grout from flowing out; After the grout hardens, cut off the grouting pipe.
f. Brush mortar for leveling: after the waterproof mortar reaches a certain strength, spray wet the repair area, brush 1:2 ordinary mortar for leveling, with a thickness of 0.5-0.8cm.
g. Curing: spray curing within 3 days
3.1.3 Grouting principle For point leakage grouting, the amount of water injected is smaller first and larger later; The circumferential cracks are grouted from bottom to top; The horizontal or inclined cracks are grouted from the small water volume end to the large end; The surface leakage shall be grouted from the periphery to the center.
3.1.4 The criteria for grouting completion shall be based on the principle of whether the surface leakage water has been effectively blocked. Dredging and plugging technical measures during grouting: consideration on hole layout
The existing leakage water shall be blocked during grouting, and the dredging grouting shall be carried out during grouting, that is, the slurry shall be injected first. When the leakage water overflows, the slurry concentration shall be gradually changed, and the gel time of the slurry shall be adjusted so that the leakage water can be dredged and blocked from inside to outside through grouting. If part of the leakage points cannot reach the purpose of slurry overflow during grouting, the leakage points shall be set with holes for grouting, so as to fill and block the grout from the outside to the inside.
3.2 Classified treatment of leakage parts
3.2.1 Expansion joint leakage treatment scheme Expansion joint (deformation joint) is a special part prone to water leakage. According to the requirements of Party A and the actual situation of the project, it is necessary to carry out waterproof grouting for the leakage part of the crack. According to the specific situation, the construction of rigid waterproof protective layer of compressive sealant shall be carried out again.
a. First chisel a "V" joint 40mm deep and 60mm wide at the construction joint, and flush it with water.
b. The PE foam strip of the grouting channel shall be fixed with ordinary Portland cement of grade 2.5 or above to fix the grouting channel and grouting pipe. When fixing the PE foam strip, a grouting pipe shall be buried every 50cm or so. The grouting pipe adopts 10-13mm pressure resistant rubber hose, which has been used as both the water diversion pipe and the grouting pipe.
c. Grouting for leak stopping and water stopping and flexible sealing waterproof construction starts from one side and the grouting pressure of polymer grouting material is controlled between 0.3-0.5MPa. When the grouting comes out from one hole next to the grouting, the grouting can be stopped, and the valve can be closed before grouting for leak stopping from another hole, and then proceed in sequence. After all grouting is completed, observe whether there is leakage, If there is still leakage in some places, grouting can be supplemented from a nearby hole until there is no leakage. Sealant shall be applied after pipe cutting.
3.2.2 Large area (honeycomb) leakage treatment scheme
a. Surface layer method: applicable to the treatment of large-area leakage of structures.
3.2.3 Leakage treatment scheme for holes, point seepage, embedded parts and through wall pipes A. Leakage treatment method for holes and point seepage
a、 Plugging method: use inorganic plugging materials to plug directly. In case of slow water leakage with small holes or large holes but small water pressure, inorganic waterproof plugging materials can be used for direct plugging. The operation procedure is: according to the leakage situation, find out the leakage point, drill a hole with the leakage point as the center of the circle (1-3cm in diameter and 2-5cm in depth), make the hole wall as vertical as possible to the base surface, clean it with clean water, twist the leakage blocking material into a cone shaped ball similar to the shape of the hole, and when it starts to solidify, quickly press it into the hole, and compact it around the hole wall, The plugging material shall be closely combined with the hole wall. When there is no water seepage after plugging, polymer cement mortar can be used to plaster and press until it is flush with the plate or wall. Advantages of polymer grouting materials
a. The groutability and gel time of polymer grouting materials can be adjusted as required.
b. The shrinkage of polymer grouting material after curing is small, and the bonding performance with concrete is good.
c. The consolidated body of polymer grouting material has certain compressive and tensile strength, and has good durability and stability.
d. Polymer grouting materials are rich in sources and have little environmental pollution. e. The operation of polymer grouting materials is safe and convenient, and the pressure injection equipment is simple. Hangzhou Plugging Company - basement leakage repair
