As a commonly used wall structure in the current building system, the strength and wall quality of steel reinforced concrete walls are to a certain extent in line with the current public housing needs. The reinforced concrete wall has certain advantages in the structural level, wall material and wall stiffness correction level, but the exterior insulation of reinforced concrete wall is always a difficult point of construction. Therefore, in order to make the construction of insulated walls closely integrated with the construction of reinforced concrete walls, we need to have a thorough understanding of the two technologies in all aspects.
1 Concept of reinforced concrete wall insulation construction
1.1 Precise selection of materials
First of all, the requirements of the polymer selected to do the insulation layer, the conventional reinforced concrete wall insulation construction of polymer materials selected in most of the following three kinds: the first is a powder, this type of polymer in the construction site directly according to the corresponding proportion into the water, and then fully stirred can be used; the second is composed of part of the powder and liquid colloid, the use of cement in proportion to the mixture of powder and Liquid colloid components, and then fully stirred can be used; the third is composed of quartz sand, cement and suspension provided by the supplier, the three in proportion to the fusion of mixing can be.
Secondly, the choice of netting woven fabric. Usually in the construction of reinforced concrete wall insulation selected mesh woven fabric, is a mixture of waterproof polymer and alkali-resistant fiber woven, it has the effect of enhancing the strength of the wall insulation and enhance its ability to resist cracking. Finally, the choice of anchorages, in the construction of reinforced concrete wall insulation, anchorages are used to fix the insulation board for splicing, often selected plastic nails and metal nails with anti-corrosion coating.
1.2 Construction environment rationalization
First, for the consideration of the factors of the cracks generated after the construction of reinforced concrete wall exterior insulation, the construction operation should be carried out when the temperature is greater than or equal to 5 ℃; wind outside the wall is less than or equal to 5 levels of the premise. To avoid the construction operation wall surface temperature is too high, cut try to avoid the rainy season construction.
Second, before carrying out the construction of reinforced concrete wall insulation must ensure that the building’s fire protection system, various pipelines, the wall must be a variety of buried parts, doors / windows are to construction is completed and inspected. Third, must ensure that the construction wall surface is smooth, no convex and concave; to ensure that it is firmly attached with the leveling layer without “delamination” phenomenon and “bulging” phenomenon; at the same time, the base wall wall humidity should be up to standard, too dry or too wet will affect the construction of reinforced concrete wall insulation.
1.3 Paste the wall according to the regulations
Before construction, we should carry out the deployment of polymer adhesive, use manual or electric stirrer to fully stir the prepared polymer adhesive, observe its viscosity and leveling treatment with water, then let it rest for a few minutes and repeat once, its viscosity should be not flowing and moderate viscosity. In the process of pasting construction, when using the point adhesive construction method, use the adhesive knife to smear the adhesive according to the back of the board, the width depends on the specifications of the adhesive knife, the thickness should be moderate not too thin or too thick, along the long distance of the board to leave two openings, the area of the adhesive coating shall not be less than 1/3 of the board area, because the point adhesive construction method has relatively low requirements for the flatness of the wall, so it is a method that is currently used more often. When the paste construction is completed, after the glue dries, use sandpaper to sand the uneven place for leveling.
2 Specific construction plan of external insulation of reinforced concrete wall
2.1 Construction design detailing
Building construction requires design is very critical to the implementation of the overall project of the building, so we need to put more effort on the design of the building project, and for the architectural design of reinforced concrete wall and insulation construction design is also the same, in the design level to consider the actual characteristics of the reinforced concrete wall and building engineering is the contradictory construction process between the construction, and from the perspective of design to avoid this.
The data of the window of the reinforced concrete wall is marked in red, and the insulation board is made with this data to ensure that the insulation version of the construction layer can be seamlessly embedded in the wall, and the further processing requirements are designed in the parts where there is a need for docking, and the docking can be improved by the design of the enterprise mouth type plate structure, and on this basis it is marked in the form of a number to facilitate the actual construction of the At a glance.
2.2 Improve the joint of insulation board
Insulation board butt joint is best to use the more detailed glue structure for a certain degree of bonding, but at the same time also to avoid bonding seams of the tight seam so as not to affect the beauty, while the bonding is not solid will also affect the actual insulation effect, so in the actual operation can be used to anchor the way to further fix the insulation board, in this process may appear anchoring with reinforcement sticks out of the wall In this process, the steel reinforcement for anchoring may protrude beyond the wall, which should be brushed with anti-rust paint to avoid corrosion of the protruding part and rust stains, which will affect the construction quality of the whole wall. When the reinforced concrete is poured to the elevation of the top floor of the building, an opening of the same thickness as the floor slab should be left on the outside of the wall; in the process of installing each specification of the formwork, attention should be paid to the calibration of the formwork to ensure the sturdiness and tightness of the splicing of the formwork, and the mutual pressure between the insulation board and the formwork should be avoided in this process.
2.3 Level processing of reinforcement concrete pouring
Each layer should not be too thin or too thick when pouring (the conventional pouring thickness range is 80cm~1m); when pouring reinforcement concrete, the material should be placed from both sides at the same time, and the height of the material should be guaranteed to be at the same level. When the pouring height reaches the design requirements the upper surface will be flush, after the completion of the pouring to monitor when the concrete strength reaches the standard (such as when mixed with antifreeze pay attention to the specification of the concrete strength increment) can be carried out demoulding steps, from the outside to the inside, pay attention to the trimming work on the sides, corners and other parts. If there is a part of the insulation board fall or missing, it is necessary to timely add with the corresponding insulation materials.
2.4 Temperature monitoring when demoulding
The demoulding of reinforced concrete wall is also a key construction point worthy of attention, because the actual demoulding requires a certain temperature for support, and once the temperature does not meet the standard of demoulding, there will be a failure of demoulding and other imaginary, and then cause adverse effects on the construction of the wall schedule.
Once the temperature is lower than the demolition temperature standard, it is necessary to carry out certain treatment on the mold body by sprinkling water, etc., so that the demolition process can be carried out smoothly. In case of quality problems, timely response mechanisms should be carried out and secondary treatment of the wall should be carried out through certain repair-type processes, thus ensuring the actual construction quality of the reinforced concrete wall.
Conclusion
All in all, the technology of external insulation construction of reinforced concrete walls must be systematically planned to avoid construction problems in the building process, so that the construction of walls can be more rationalized.
This is conducive to the development of the construction of reinforced concrete walls and the construction technology innovation of reinforced concrete walls, and also conducive to the improvement of the overall quality and overall thermal insulation performance of China’s buildings, thus promoting a new progress and development of China’s construction industry.