The high-rise residential building of the New Feijinchen Building is a basement level and has 27 floors above the ground. The total construction area is 37,500m2. All the inner walls of the exterior walls, the partition walls, and the bottom of the floor of the building are all made of 20mm thick polystyrene foam board insulation. Material, externally attached *4 steel wire mesh, and the surface is decorated with plastering. The applied area is 25,800 square meters. It has the advantages of fire prevention, good thermal insulation performance, energy conservation, and high construction speed. The construction method successfully solved the common problem of difficult plastering of steel wire frame polystyrene insulation board and the easy-to-create long-length cracks on the surface, and formulated the construction method to obtain good economic benefits. This method changes the traditional spray mortar process, and applies 25 to 30 fine-grained fine-grained concrete on the wire mesh polystyrene insulation board. The fine-grained concrete and cross-threads are used as the base layer, and technical measures are taken to effectively solve the surface of the plastering layer. The common problem of cracks has greatly increased the strength, stiffness, insulation, waterproof, fire-retardant and other indicators of the wall surface, accelerated the construction speed, and met the requirements for the use of the wall. Second, the plastering layer construction method, process flow and operating points Construction method of the plastering layer structure: Based on the previous construction experience, based on the joint analysis and study of the construction, design, supervision and construction unit, determine the following Construction method. 1.1 Substrate: steel mesh polystyrene insulation board; cement (the ratio determined by the test room test match); mm thick 1:37 cement mortar; process for the installation of a polystyrene insulation board a handover process C25 fine stone concrete base technology Intermittent for more than 15 days A touch of medium mortar A technical interval of more than 5 days An overcoat of gray spray water retention maintenance inspection and acceptance. 3.1 Process handover: Before plastering, on the basis of the self-test of the steel wire frame polystyrene insulation board installation unit, according to the floor, construction section and deformation joints, divide inspection batches to carry out the process handover acceptance, and then go through the procedure handling procedures after passing the qualification. 3.2 Primary treatment: Prior to plastering, dust, dirt, and oil stains on the surface of steel wire mesh and polystyrene foam should be removed in advance. 3.3 Anti-cracking measures for the plaster layer at the corners of doors and windows: Due to the perturbation of the window screed at the corners of the window openings, the 45 degree diagonal cracks are likely to occur after use. To this end, in the corners of the doors and windows on both sides of the 45-degree angle to strengthen the net reinforcement, the length is greater than 700 3.4 fine stone concrete foundation essentials: 3.4.1 steel wire mesh polyethylene insulation board base layer using 25 ~ 30m thick stone concrete and horizontal Wire, "the, glyph mesh form steel mesh concrete base, in order to increase its strength and overall stiffness. The fine stone concrete strength grade of the project is C25. 3.4.2 adjust the construction mix ratio, reasonable mixing of sand and sand, to reduce During the painting period, concrete walls, ceilings, and other parts of the mortar are left to sand with a large amount of fines containing fine slag, which, if not properly utilized, will result in significant waste of resources, so adjust the ratio of C25 fine stone concrete according to the actual situation. , The rational addition of sand residue in the fine stone concrete base can effectively reduce the cost of the project and ensure that the site is clean and civilized. 3.4.3 When applying fine-grained concrete to the bottom layer, apply a wooden trowel to separate and wipe the trowel, and rub it again and again, not less than 3 times, so that the fine-grained concrete base is compact, the surface is smooth, and the grazing effect is good. The thickness is covered. Additional mesh is appropriate. 3.4.4 For the construction interval of fine stone concrete base layer and middle and surface layers, because the fine-grained concrete at the base layer is thick, the concrete base layer should be fully shrunk and the deformation should be stabilized before the middle and surface layer mortar is wiped. Therefore, it is necessary to scientifically and reasonably divide the construction section so that the interval time is more than 15 days. If the temperature is low, the interval should be appropriately extended. 3.4.5 For smearing, surface mortar, vertical, set of squares and plastering plaster can be hung in the corners of windows, concrete walls, walls, etc., and then applied. If the thickness of the ash cake is between 5 and 8 m, the surface mortar can be directly applied. If the thickness of the ash cake is too large, it should be divided into two layers in the middle and the surface. 3 Cement mortar, leveled with a screed, the surface should be flattened with a wooden trowel. After wiping, check the verticality and flatness of the middle ash, squareness and straightness of the yin and yang corners, and whether the plastering of the pipeline is smooth. If problems are found, they must be promptly corrected. 3 cement mortar, sand, medium and fine sand should be used to facilitate calendering. After wiping, use a screed to level the wood trowel, squeezing hair, compacting, and using a steel trowel to calender after the water is collected. Make it able to meet the light requirements under refined decoration conditions. 3.4.8 For the interval between the middle layer and the surface layer, the middle layer mortar should be 70% to 80% dry. The interval time should be determined according to the temperature conditions. The general interval time is not less than 5 days. If the temperature is too low, the interval should be appropriately extended. 3.4.9 For protective corners, indoor walls, door openings and openings can be made of 1:2 cement mortar for dark corners, height not less than 2 meters, width of not less than 50 3.4.10 for each plastering layer Maintenance, if the base layer, the middle layer of mortar after the final condensation temperature is too high, the use of sprayer appropriate spray, moisturizing conservation, maintenance days depending on the actual situation may be. Surface maintenance can be sprayed with spray water moisturizing maintenance methods, to arrange personnel, regular, fixed-point maintenance, conservation time of not less than 7 days. 4.1 Fine stone concrete and cement mortar should be used up before initial setting. Because concrete or mortar is hard to be used after being hardened, it has poor workability and water retention, and it has a large shrinkage after hardening and a low bond strength, so it cannot be used continuously. 4.2 The external wall insulation of high-rise residential buildings, office buildings, kitchens shall be installed before the plastering of the steel wire mesh polyphenylene insulation board, and then the second renovation. 4.3 Since the thickness of the fine stone concrete on the steel wire mesh base is too thick, the interval between the fine stone concrete and the middle and surface layers should be carried out according to regulations, so that the base layer can be fully contracted and deformed. After stable, it can wipe the middle and surface mortar. 5.1 Cement: 32.5 Ordinary Portland Cement should be adopted, and the factory certification must be issued before entering the site, and re-inspection should be conducted as required. 5.2 Medium sand: The clay content is not more than 3%. It must not contain organic substances such as clay and grass roots. The indicators should meet the requirements. 5.3 fine stone: the largest particle size should not be greater than 10 paintings, uniform particle size, mud content is not more than 2%, the indicators should be consistent with "construction cobbles, gravel" requirements. 6.1.1 The steel wire rack polystyrene insulation plastering should be undertaken by a professional construction team. 6.1.2 Steel mesh polystyrene insulation construction for new materials, new technologies, new processes, so the operator should be pre-job training before construction to understand the process characteristics, operating points, quality standards and construction precautions, etc. Seriously do a good job of technical disclosure. 6.1.3 The personnel organization shall be determined according to the quantity of plastering work and the project duration requirements. The operation of the JZ350 concrete mixer and 350 liters mobile mortar mixer should be strictly in accordance with the "Technical Safety Regulations for Construction Machinery" and the product specification requirements. 6.2.2 Before the construction of plastering subprojects, the construction personnel of the project department shall make a special safety disclosure to the construction team and earnestly perform the signing procedures. 6.2.3 The safety inspection personnel shall seriously implement the relevant provisions of the “Construction Safety Inspection Standardsâ€. The quality standards of this engineering method shall be implemented in accordance with the relevant provisions of the “Code for the Quality Acceptance of Building Decoration Engineering†and the “Construction Regulations for House Decoration Engineeringâ€. In addition there are the following requirements: 7.1 base fine stone concrete strength should meet the requirements. The test pieces used to check the strength of the base concrete shall be appropriately retained in accordance with the “Code for Acceptance of Construction Quality of Concrete Structure Engineeringâ€, but the sampling of concrete with the same mix ratio of each floor shall not be less than one set. 7.2 fine stone concrete base and middle, surface interval time should not be less than 15 days, and should try to extend. 7.3 After the construction of the plastering surface, the construction technology plan shall be followed to take effective conservation measures. Third, the effect of the process and features of insulation, heat insulation and other properties can be improved. After spraying the fine stone concrete, due to the compact concrete base layer and the smooth surface, the effect of heat preservation and heat insulation is greatly improved. After testing, all indicators exceeded the corresponding national standards. Strength, stiffness performance is improved. After fine stone concrete is sprayed, the middle and surface plastering procedures are applied to greatly increase the strength and rigidity of the wall surface. Drilling on the wall and hanging the decoration are safe and reliable. Good fire resistance. Plasterboard with single-sided plastering is an excellent fire protection measure. According to actual measurement, its fire-resistant limit is higher than 2.5 hours. The economic benefits are better. The plastering base adopts fine-grained concrete to replace the traditional cement mortar technology. Because the fine stone is cheaper than the medium and coarse sand, and at the same time the residual gravel residue of the plastering project is properly mixed in the fine stone concrete, the engineering cost can be greatly reduced, and the economy can be greatly reduced. Social benefits. Passenger Conveyor Spare Parts
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Steel wire frame polystyrene foam insulation board construction process and crack control