Application and Research of Polyurethane Waterproof and Thermal Insulation System for Exterior Wall of High-rise Buildings Ni Yaxing (Yangzhou Construction Engineering Company, Yangzhou, Jiangsu 225002, China) introduced the construction technology and construction difficulties of polyurethane waterproof insulation system, and analyzed the construction technology of the surface bricks on the external insulation surface. Building energy saving; waterproof; heat preservation; exterior wall brick project is located in Shanghai area, is a high-rise residential building consisting of 1925 floors, with a total construction area of ​​20,000 m2, building height of 5480m building adopts shear wall structure system, outside The wall is a 200mm thick reinforced concrete wall. The surface area of ​​the building is 13811 m2. Due to the serious air pollution wall surface in Shanghai and the aesthetic requirements of the building facade, the project is pasted with a tile facing on the external insulation of the exterior wall. 1 system structure (see) 2 construction materials are made of organic polymer polymer and inorganic reactive powder composite two-component waterproof material, strong adhesion to the base layer, and good integrity, after film formation with cement mortar and other adhesives Excellent affinity. In the whole system, it mainly plays the role of waterproofing and interface treatment, so that the rigid polyurethane foam is well combined with the base layer, and the adhesion of the system surface crack-resistant putty to the rigid polyurethane foam is strengthened. Rigid polyurethane foam is a two-component material composed of a combination of polyether and isocyanate, and is sprayed by special equipment to provide excellent heat preservation. It adopts on-site spraying construction to form a continuous low-absorbency foam, so it has excellent waterproof performance. Rigid polyurethane foam is very important in the whole system. In the technical index of product number, water absorption rate, etc., it is necessary to master the foaming time, foaming flatness and thickness during the construction process, so the construction equipment and The construction personnel have high technical requirements. Fiber-reinforced anti-cracking putty mainly serves as surface protection and leveling. It is based on solid water-soluble polymer and inorganic silicate materials, adding various additives and glass fibers, and is high-speed in dry powder mixing equipment. Decentralized. The utility model solves the defects that the conventional putty has poor adhesion on the surface of the heat insulation board and is prone to cracking. The steel mesh covers the outer surface of the rigid polyurethane foam as a mechanical connection reinforcement for the entire system. During construction, it is placed in the middle of the anti-cracking putty layer, and the surface load portion is transferred to the base layer by the anchor. The steel mesh used in the construction of this project has a hole diameter of 10mm×10mm and a plate thickness of 0.5mm. The anchors anchor the iron parts of the steel mesh. The construction of this project uses US solid nails, the total length is 80mm, anchored into the base layer is about 6Qmm, and the exposed construction is about 3. 3.1 Measurement, laying and anchoring are placed at the corner of the building's outer wall (positive angle, negative angle) and other necessary places ( For example, the outer wall line, the window, etc.) hang the vertical reference line. According to Ni Yaxing (1976-) of the baseline, male, Yangzhou, Jiangsu, engineer of Yangzhou Construction Engineering Company, 2C standard, No. 12, Lane 1097, Pudong Avenue, Shanghai, set the reference point of the flatness of the rigid foam insulation layer. Set no less than one interface flatness reference point every 2m on the base layer. The reference point material is made of polystyrene foam board with a density of 2030kgin3, the size is 30mm, and it is adhered to the wall surface with reinforced anti-cracking putty. After curing for 48h, the next process can be carried out. Shown. An L-shaped steel mesh is attached to the female corner, and the length of each side is not less than 50 mm, and other construction practices are the same as the wall surface. According to the specifications of the stencil of the steel wall surface of the later cover, the slabs are arranged, and the anchor bolt positioning line is ejected on the wall surface, and at the same time, the bolts are fixed at the lap joint of the steel mesh. According to the positioning line, drill holes in the wall and place the anchor. 3.2 Spraying rigid polyurethane insulation layer Rolling coating 1 waterproof coating film slurry (solid phase: liquid phase: water = 1:1:1). When rolling, it should be evenly placed, completely covered and cured for more than 24 hours. The hard polyurethane layer is completed by spraying. The spray thickness meets the design thermal calculation requirements. The design thickness requirement of this project shall not be less than the continuous spraying of the construction work surface on the same day, and the curing shall be for more than 24 hours. Pay attention to the protection of windows, doors and other components when spraying. If there is pollution, clean it immediately. 33 waterproof layer construction due to the low level of flatness requirements, hard polyurethane foam spray construction after 24h, the use of a dense tooth hand saw to repair the wave peak trim. On the surface of the finished rigid polyurethane foam, brush the waterproof coating film (solid phase: liquid phase: water = 1:: 1), and mix fine sand to increase the roughness. Roller should be evenly placed in place to completely cover the base layer. Do not apply less or leak. After the curing for 24 hours, the next process will be carried out. 3.4 batches of embedded anti-cracking putty, set up the steel plate to enhance the flatness of the anti-cracking putty interface, and should be no less than one every 2m on the wall. The thickness of the anti-cracking putty in the first step is to be leveled on the surface of the hard foam body, and should be controlled at about 5 mm. After the curing for 24 hours, the next process is carried out. After the first anti-cracking putty construction is completed, the steel mesh is hung according to the size of the front row of the construction. The joint between the steel mesh and the anchor bolt is pressed and anchored with a rustproof gasket. The lap length of the steel mesh is not less than 50mm. The thickness of the anti-cracking putty in the second pass is set to cover the steel mesh as the standard, generally 34mm. After the curing for 24h, the next process is carried out. The batch-embedded layer enhances the anti-cracking putty to ensure that the surface flatness meets the requirements of the base layer for the construction of the next process. After 48 hours of maintenance, the next process will be carried out. The size of the outer wall brick selected for this project is 73mmX water absorption <0.5% breaking strength>700N, modulus of rupture>30MPa, ash seaming degree 7mm. According to the model requirements, the bullet dividing line is required at the corner of the temple and the door and window. Whole brick. The intersection of the corners of the corners is 45° trimming. Use flexible tile adhesive inlay tile to ensure that the back of the tile is covered with adhesive. After affixing, use a small shovel to gently tap and squeeze, so that the tile and the base layer are firmly bonded. When the flexible surface brick caulking agent is used for jointing and jointing, the construction sequence of the first hook horizontal joint and the vertical joint joint is carried out. Ensure that the seam is smooth, no blisters, cracks, and the seam depth is about 2mm. After the tile inlay is completed, it should be strengthened. Generally, it should be no less than 7d. 4 Notes on each process The anchor should be pulled and tested at the site, and the layout plan should be calculated according to the measured data. The position of the anchor bolt must be determined in conjunction with the position of the steel mesh panel to ensure that the anchor bolt is fixed at the steel mesh joint. The surface flatness of the hard foam should be effectively controlled mainly during spraying, and the artificial flattening should be avoided as much as possible in the later stage, so as to ensure that the closed membrane body of the hard foam body is not damaged. The paving of the steel mesh is a difficult point in the construction of the whole system. It is necessary to do the underlying leveling putty first in strict order, then hang the net, and finally make the surface layer putty. It is not allowed to directly crack the putty on the surface of the hard foam body. . Because: 1 When there is a large gap between the steel mesh and the hard foam body, the crack-resistant putty can not effectively fill the void through the mesh and firmly bond with the hard foam body, which will cause the hanging phenomenon, resulting in the putty layer and the hard foam body. 2 empty steel; 2 steel mesh directly contact with the hard foam body, lack of putty protection, easy to be affected by moisture and rust; 3 steel mesh clamped in the middle of the putty layer, can effectively improve the ability of the entire system to resist deformation stress. The smaller size of the exterior wall tiles should be chosen to help reduce the deformation stresses that can occur on each tile. When bonding the exterior wall tiles, special adhesives and grouts with flexibility index (lateral deformation, flexibility) should be selected. Compared with ordinary ceramic tile adhesives, the flexible adhesive used in this project is 46 times the lateral deformation and 22 times the tensile bond strength. It should be avoided to strengthen the construction of the anti-cracking putty surface (small lateral deformation, such as ordinary ceramic tile adhesive, etc.), which will have a restraining effect on the base flexible putty. 5 polyurethane waterproof insulation system performance analysis This insulation system will be unified with waterproof and thermal insulation, eliminating the defects of traditional waterproof and thermal insulation combination. In the construction, it has convenient construction, short cycle, low requirements for the flatness of the base layer, high bonding strength with the base layer, the cap does not exceed the EPS board, the amount of anchors is >4 m2, and is pasted in the corner and the hole. Before, the anchors around the wall and the edge of the hole should be properly encrypted. The narrow EPS corner mesh is pre-applied on the EPS board (provided by the EPS board manufacturer). When pasting the tundish mesh cloth, apply 25mm thick IDL bonding mortar to the overturning part, lay the mesh cloth on the bonding mortar, press it into the bonding mortar with iron trowel, and make the popped mortar Cover the mesh cloth and pry part of the length around the end of the board to expose the board larger than 100mm (see ). EPS boards EPS boards should be arranged in horizontal order. The installation should be glued from the bottom to the top. The yin and yang corners should be treated with wrong smashing. The upper and lower boards should be staggered 1/2 long. The board and the board must be tight. No more than 2mm, the height difference between the boards is not more than 1.5mm. When pasting the EPS board, it should be pasted from the periphery of the window. The board to be cut is placed in the middle. When bonding, all the bonding strips are in contact with the base layer at the same time. After the EPS board is glued to the wall surface, it is inspected with a 2m ruler to flatten and compact the board. The bonding mortar on the side of the extrusion plate was cleaned with a gray knife when pasting. After grinding and smoothing the EPS board, it will be polished and smoothed after 24 hours. The sanding action should be carried out in a gentle circular motion, not in the direction parallel to the seam of the EPS. While polishing, check whether the EPS paste is firm and flat. The anchors are installed after the EPS paste is completed for 72 hours before the anchors can be installed (the anchors are provided by the EPS board manufacturer). First use the impact drill to drill the hole according to the outer diameter of the anchor; tap the anchor nail, nail 3.5IDL-23 insulation cover mortar paint IDL-23 insulation cover mortar to separate the bottom layer and the surface layer 2 layers, the configuration of the overlay mortar and IDL -21 bonded mortar has the same configuration. After the installation of the EPS board of the underlying surface mortar is checked and accepted, the underlying mortar is painted. The mixed thermal insulation mortar is evenly applied to the surface of the EPS board, which is 23 mm thick, and the tundish mesh is pressed into the mortar. Lay the mesh cloth and tighten the mesh cloth to the mortar on the bottom cover. Press the mesh cloth from the center to the surface of the mortar with the iron trowel. Flatten the mesh cloth as soon as possible. Wrinkles. The mesh must not be pushed too deep and the surface must be exposed to the underlying mortar. If there is a lap joint, the lap length of 100 mm in the horizontal direction and 80 mm in the longitudinal direction must be satisfied. The surface layer mortar is applied to the surface layer of the mortar before the condensing of the underlying surface mortar, and the thickness is 12 mm. It is only suitable to cover the mesh cloth and the contour of the mesh cloth. The surface mortar is strictly prohibited from stopping, so as to avoid the formation of empty drums. The construction gap of the surface layer mortar should be in the natural disconnection, such as the yin and yang angle, the hole and other parts. If you need to pause on the continuous wall, the surface mortar should not completely cover the paved mesh cloth. It needs to be made with the mesh cloth and the bottom mortar as a stepped slope. The spacing between the mortar and the mortar is not less than 150mm. 36 Exterior wall coating Before the construction exterior wall coating is applied, the IDL insulation cover layer is repaired, and the water-resistant flexible putty is used to make the foundation. The construction of the coating can be carried out by polishing with fine sandpaper. The construction method is the same as that of the ordinary wall surface coating. (Finish) Island Light is a type of Pendant Light commonly used over the central island in a kitchen or over a long table in a dining room. It typically has multiple bulbs to provide sufficient light to illuminate the entire area. Island Lights come in a wide variety of designs, ranging from traditional pendant styles to modern, industrial, or artistic designs. Island Lights not only provide light but can also serve as a decorative element in a room. 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