Waterproof construction technology for exterior walls

Exterior wall waterproof construction technology:
1, wall inspection and treatment
1, exterior wall masonry requirements: masonry to avoid wall weight seams, light transmission, mortar ash seams should be uniform, walls and beam columns junction, should clean up the waste pulp Brick masonry should be moist, masonry wall can not be once to the top, should be divided into two to three times to complete, in order to prevent mortar shrinkage, so that the wall is fully solid, and pay attention to the wall flatness detection, in order to prevent the next process batch of gray too thick or too thin.
2, wall hole inspection and treatment: before the batch of gray should check the wall hole, sealing as a wall body of various holes, uneven place with 1:3 cement mortar to find flat, if too thick, should be layered to find flat, or hanging steel mesh, bonding cloth and other batch ash, scaffolding, tower hanging, construction Elevator pull rod and so on in the outer wall left holes should be clean and moist, with vegetarian cement slurry sweep full, and then with dry hard crucible 2 times each semi-blocking, first inside and after, fully mashed solid, water drop pipe card drill hole tilted down 3 degrees -5 degrees, nail sleeve expansion hose brush epoxy resin embedded, strictly prohibited the use of wood wedges. The screw holes in the concrete shear wall should be chiseled into horns, stuffed with expanded cement mortar, sealed with polymer waterproof slurry, and sealed tightly
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3, the outer wall to repair the outer wall local appearance of a small number of rising mold, honeycomb hemp surface phenomenon, according to the actual situation to take the following methods to repair the surface: (1) the mold repair, first of all, will not meet the design and specification requirements of the protruding part of the chisel, and clean up, followed by a wire brush or pressurized water washing the grass, and then with 1:2 or 1:2.5 cement mortar to find flat, and finally water conservation for fourte days. (2) cellular repair (all found honeycomb hemp surface area is small area without deep hole phenomenon), first of all, the surface of loose stone, crumbs chisel, and clean up. Second, before repair should be watered to rinse the dust on the surface to be repaired, keep the patching substation moist, and then use 1:2 or 1:2.5 water mortar to find flat, and finally sprinkle maintenance for fourteen days.
II, to ensure that the construction quality of the flat layer
1, to find the flat layer before the dust work: should pay attention to the masonry batch ash front surface wet, sprayed with sufficient water, masonry part and concrete part of the junction of the outer wall before the dust to be covered with 200mm wide 16 x steel mesh cover and fixed, in order to resist the expansion coefficient of different materials caused by the cracking. For the concrete wall of floating pulp, residual template wood chips, exposed steel bars, wire must be cleaned up, in order to help the ash mortar and the grass bond firmly.
2, when looking for flat layer ash should pay attention to: (1) mortar should be strictly in accordance with the ratio, strict measurement, control the water ash ratio, strictly prohibited in the construction process of random doping of water; (2) the ash mortar should be layered ash, especially high-rise buildings, local external wall dust thicker, which requires layered ash, each layer of ash thickness should not exceed 2cm, such as the thickness is too large, in the layer should be set up wire mesh; (3) the batch of ash mortar can be waterproof mortar with polymer; (4) the outer wall to wipe the gray scaffolding to pull the ribs, etc. , should be cut, the horn mouth is solidly flattened, after the slurry, can be cut into reverse with iron smears, and then brush a vegetarian cement slurry.
3, to ensure the construction quality of the exterior wall tiles
1, mounted tiles should first check to find the flat layer whether there are empty drums, shells, cracks and uneven, if there should be immediate repair qualified, and then with pure cement slurry (with 10%107 glue) in the find flat layer full brush and pull treatment.
2, tiles should meet product quality requirements, before setting should be uniform color of the tile No, flat corner edge no selection, tiles should be 1 to 2 years in advance immersion in the pool, when dry surface floating water.
3, surface brick can be used 1:1 water sewing fine mortar mounting, mosaic first in the back of the tile scraped a layer of 7mm thick mixed with 107 glue slurry, to make up for uneven and enhance the bonding force, surface brick mounting should be pressed tightly squeezed into place, squeeze pulp to make the narrow seam full, the remaining pulp timely removal.
4, the surface brick paste finished in time to tew, the seam should be used 1:1 polymer waterproof mortar, to reduce the brittleness of cement mortar, the general seam set width of about 8mm, the stitching order must be horizontal and vertical seams at the same time, to prevent the appearance of excessive head, the form of the seam is concave, slightly less than the surface brick 2 to 3 mm. After the hook is finished, after checking for leak-free hooks or other defects, wipe the surface of the tile clean with cotton wire. Finally, sprinkler maintenance is carried out for several days.
5, in order to prevent the cracking of the tile and bonding layer caused by leakage of the wall, can be left on each floor side beam, 2 horizontal section seams, so that the tile bonding layer separation. The section seams should be cleaned and filled with weather-resistant glue before removing the outer scaffolding, which is flat with the tile surface. The corners of the yin are also closed with weather-resistant glue.
4, to ensure the quality of door and window construction
before the installation of doors and windows to check the size of the door and window holes, the size deviation of large to be processed, so as not to be too large or too small around the window frame to affect the quality of the seam, generally requires the edge of the box and the hole between the seam width of about 20mm. Installation must be in accordance with the specifications, horizontal vertical, fixed, and do a good job of concealed project acceptance. After the window frame is fixed, after using polymer waterproof mortar to plug the perimeter of the window frame, before the plug first brush a cement waterproof mortar to help the mortar bonding, the seam to be pressurized, full, there must be no light transmission phenomenon, check to confirm the quality of the plug before continuing the window frame around the ash construction. Cement mortar whitewashed window cover trays must be done with drip lines. The outer port of the concrete mortar with a brown back brick surface must be lower than the mouth. Doors and windows installed, whitewashed molding, to carry out product protection, doors and windows can not be destroyed.
, to ensure the quality of roof construction
roof and exterior wall closely linked, roof node design and construction is very important. "Roof Engineering Technical Specification" and "Roof Engineering Quality Acceptance Code" GB50207-2002 clearly requires that one head (waterproof layer of the head), two seams (deformation seams, split seams), three mouths (water drop, entrance, eaves) and four (daughter wall root, equipment root, pipe root, chimney root) and other water-wide parts of the fine structure treatment. For solving the problem of leakage of roof nodes, from the design, designers are required to strengthen the treatment of these parts, detailed drawings. Fully consider the structural deformation, temperature difference deformation, dry shrink deformation, vibration and other effects, the use of node sealing, anti-row combination, just soft complement each other, multi-channel defense and other methods to meet the needs of grass-roots deformation. From the construction, before the construction should be formulated roof waterproof construction special program, the construction staff to pay the bottom in detail, so that they have a number of operational points in mind, to ensure the reliability of node waterproofing.
6, external wall leakage inspection measures
the use of continuous water leakage method, can use a water pipe of 20mm, the use of 3kpa pressure water, in the top floor of the building continuous water 6h, to observe the inner wall and window around the occurrence of water seepage phenomenon.
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