Research on Construction Technology of Science and Technology and Engineering Energy-saving Building Exterior Wall Insulation Board Liu Fang (Guangxi Communications Vocational and Technical College, Nanning 530023) See. In view of this situation, the purpose is to enhance the insulation effect of the insulation board on the outer wall. The method of optimizing the construction technology to control the quality of each construction process is combined with the actual engineering, and the countermeasures against the common defects in the construction of the thermal insulation board by the external wall make the thermal insulation board play a greater role in the actual building. External thermal insulation is an integral part of energy-efficient buildings. The good or bad construction directly affects the energy-saving effect, so the research on construction technology is very important.
External wall insulation refers to an engineering practice that uses a certain fixed way of insulation material to be integrated with the wall of the building to increase the average thermal resistance of the wall to achieve insulation or heat insulation. See the schematic diagram of the wall insulation structure.
1 Analysis of energy-saving wall insulation method As the enclosure structure of the house, the external wall insulation method has the greatest impact on the energy-saving effect of the house. At present, the wall insulation in China usually adopts three methods, namely, external wall insulation, external wall insulation and Sandwich insulation form. The advantages and disadvantages are shown in Table 1. As can be seen from Table 1, whether from the effect of heat preservation or economic efficiency, the use of external insulation has other insulation parties received on August 2, 2012, August 22 Revised the lecturer of the hospital and the master of engineering of Guangxi University. Research direction: construction engineering technology, engineering management. Unparalleled advantages. Because of this, the country is also demanding energy-saving methods for external thermal insulation of the external walls while improving energy-saving standards step by step.
2 External thermal insulation wall construction control points 2.1 The quality of the base cleaning powder has a decisive effect on the laying of the thermal insulation board. The requirement for flatness is not more than 4mm per 2m (check with a ruler of 2m or more). Painting base layer inspection: Before the insulation board is laid (as usual after 7 days of painting, it can be adjusted according to the weather conditions), the sampling of the base layer of the painting is performed (the bond strength is equal to 0.45 MPa, the water content is equal to 10%), and the pass can be qualified. The following process is carried out. m. 2.2 The material used for the bonding mortar mixing system is the finished material. Therefore, the requirements for the special adhesive (sand mortar) are as follows (because the requirements for the special binder for mixing are high, it is necessary Carry out special person responsible for mixing): The composition of the bonding plaster is dry powder and water. After the dry powder enters the field, it is evenly stirred at a weight ratio of 4:1 (dry powder: water). After stirring for 5 minutes, stir again for half a minute. . When the temperature is below 30 °C, the material must be used up within 3040min. When the temperature is above 30C (including 30C), the material must be mixed. After the construction of the 152.3 insulation board, the benzene board is started. Paving.
Before the paving, the following preparatory work needs to be carried out: hanging wire, in the 1 operation layer, table 1, wall insulation method, comparison project, external wall, internal insulation, external wall, external insulation, sandwich insulation process, insulation material, composite material on the inner side of the load-bearing wall, and thermal insulation material on the wall. On the outside, the whole building is wrapped in the thermal insulation material and the thermal insulation material is placed in the middle of the outer wall. Advantages 1. Uncomplicated technology and simple construction 1. Wide application range 1. Conducive to better exerting the wall itself 2. Low thermal insulation material requirements Technical requirements 2. Protect the main structure and prolong the life of the building (Note: The real estate business must have a lifetime warranty on the external structure compared to the external insulation.) 2. The strength of the insulation material is not strict 3. The cost is relatively Lower 3. Basically eliminate the influence of the hot and cold bridge to improve the moisture condition of the wall, which is conducive to the stability of the room temperature. Improving the quality of the indoor thermal environment is conducive to improving the waterproof and airtightness of the wall, so that the energy-saving renovation of the old building can be relatively reduced. The use of insulation materials increases the disadvantage of the use area of ​​the house. 1. It is difficult to avoid the generation of hot and cold bridges. 1. In the wall 1. Because the insulation layer is on the outside of the wall, the environment is harsh. It is easy to produce heat bridge surface on the thermal insulation body. It is easy to produce condensation, moisture, and even mildew. The quality of each material is stricter and the internal air convection is easy to form. Poor waterproof and airtightness 2. Required materials and compatibility with each other are relatively difficult to construct. 3. Not conducive to the protection of building maintenance structures. 3. High wall cracks are not easy to control for the weather resistance and durability of thermal insulation systems. Cracks in the inner insulation board are a common requirement for poor earthquake resistance. 4. Construction is difficult. It is necessary to have a good quality construction team and the difference between the inner and outer walls of the technology. The wall is easy to be broken in the home decoration after the small owner stays. The support body cannot be deformed synchronously, and the structure is not bad, so that the actual insulation effect is reduced, and the paving start surface ejects a horizontal line around the wall surface. Install the aluminum bracket at the bottom and use the spirit level when installing. Considering that the insulation board does not have sufficient bearing capacity before the binder is dry, the laying order of the benzene board should be carried out from the bottom up, and the construction must be carried out by the ruler to ensure the flatness requirement. It is required to align the layout boards from the bottom of the wall surface, paste them one by one, and paste each row in order, and paste the gap between the rows and the rows. The outer corners should also be staggered. The indirect seam of each row of plates and plates shall be staggered by 1/2 plate length, and the minimum length of the benzene plates shall be guaranteed to be more than 200 mm (including 200 mm). The gap between all insulation boards should not exceed 1.5mm. See the insulation board sticking practice.
2.4 The adhesion of the insulation board is controlled by the amount of the adhesive. The square tooth trowel is scraped at an angle of about 45°, and the gray strip is pulled out, and the width is about 5 cm. The application area of ​​the adhesive should be greater than 40% of the entire board area. Try to position the position as much as possible. If there is any deviation, you can slide it in place. The paste should be gentle. Use a tool to press against the wall surface (no hand slap), and use 2m or more to measure it to ensure smoothness. As close as possible, the seams are as small as possible. The paste should be placed as far as possible. If there is any deviation, it can be slid in place. The paste should be gentle. Use a tool to press against the wall surface (no hand slap), and use 2 meters or more to measure it to ensure smoothness and heat preservation. The board should be as close as possible, and the seams should be as small as possible.
2.5 The gap caused by the dimensional deviation of the gap repair and the sanding insulation board (greater than 1.5mm width) should be sealed with strip insulation material. After the paving is completed, sanding is performed at intervals of 24 hours. Use a utility knife to cut off the surface of the wall, and then use the sanding plate to grind the unevenness of the seam; use 2m or more to check the flatness, so that the flatness of the entire insulation wall does not exceed 4mm/2m. The polystyrene chips should be cleaned at any time with a brush, broom or compressed air. The place where the board is broken or closed is sealed with a sealant.
2.6 Before the construction of the reinforcement layer, check whether the board is dry and clean. The entire wall is fully primed with an adhesive plaster. The alkali-resistant mesh cloth is applied to the bonding plaster before the bonding plaster is solidified. Adhesive plaster should be adequately wrapped around the mesh, but the mesh should be as close as possible to the surface of the reinforcement layer approximately 2/3. Specifically, the construction quality can be controlled by seeing the grid cloth color and seeing the grid cloth grid standard (meaning that the less the outer layer of the mesh cloth is, the better the adhesive is pressed into the mesh cloth or the outer layer. After the end, use a 2m scraper to scrape the outer surface.) This process emphasizes mutual cooperation and qi. Alkali-resistant glass fiber mesh cloth should be overlapped by 10cm regardless of the top, bottom, left and right. The thickness of the bonding plaster in the reinforcing layer is about 3 mm. In order to prevent the cracking of the reinforcing layer, the reinforcing layer and the facing layer cannot be made too thick to cover the unevenness of the heat insulating board. At room temperature, the construction of the finish layer can be carried out after one day of drying. Drying time may be extended to 2 days in low temperature and high humidity environments. In the case of high temperature weather, the bonded plaster can be sprinkled and moisturized on the surface after final setting to prevent the surface from losing water and causing capillary cracks. It is necessary to apply the glue first and then bury the net. When encountering the door and window openings, a standard grid length of 30cmX20cm should be subsidized at a 45-degree angle at the four corners of the hole to prevent cracking (see). Moreover, this step should be completed before the large area is laid. Acrylic sealant is required to infiltrate the water at the door and window and at the interface.
Door and window opening and overturning mesh cloth practice 3 Construction quality defects and countermeasures 3.1 Construction quality defects For the quality defects of external thermal insulation with external walls, comprehensive practical engineering questionnaires are drawn, and the influencing factors are arranged for analysis.
Guarantee S1 board MMWMWVIKW; gray extraction W post school paste anti-5 sand purple t his external wall thermal insulation quality defect analysis can be seen, the cumulative frequency of thermal insulation board paste and glass fiber mesh paste construction quality defects reached 77%, It is an important construction factor and is a major problem affecting energy conservation projects. In addition, due to the effect of negative wind pressure and air pressure, a single thermal insulation board has a large force-bearing blind zone, and the service life is between five and ten years. The long-term wind and rain will inevitably lead to the fall of the thermal insulation board, which will be for residents. Production and life have a greater impact, and even endanger human life. H. 3.2 Countermeasures implementation 3.2.1 Pop up the horizontal and vertical control lines according to the specifications; before the corners of the door and window openings are pasted with the whole board, the horizontal control line is popped according to the specifications. And hang the verticality control line, paste from the bottom to the top, first test the row, the upper and lower plates are staggered 1/2 plate length, the plate and the plate are strictly stable, the seam height difference is not more than 1mm. Non-standard size The thermal insulation board is cut into an L shape by a whole plate at the corner of the door and window opening, and the incision should be flat and accurate in size. Uniformly apply 5cm wide adhesive glue along the circumference of the standard board. The middle part is arranged at 8 points with a spacing of 200mm. Each point is 10cm in diameter. The application area of ​​the bonding glue is not less than 1/ of the board area. 4. The number of points in the middle part of the non-standard board is controlled at 4 to 6 points, and the application area of ​​the bonding glue is not less than 1/3 of the board area. After the bonding glue is applied, the board is flatly attached to the base wall. , squeezing and evenly squeezing, in order to ensure the flatness, the flattening operation is carried out with a 2m ruler to ensure that the seams are tight and flush; the mesh cloth is turned over at the door and window openings and joints, and the board surface is turned out to be 10cm. It is overlapped with the surface mesh to make the insulation board a stable whole. Effect check: The insulation board is firmly adhered, there is no looseness and thermal bridge phenomenon, and the qualification rate of the insulation board is 96%. 5.2.2 Using a special cutting tool for electric heating wire, try the 1mm diameter copper wire and connect the low voltage current to make it. The electric heating wire is cut by the hot melt method. After the actual operation on the spot, it is found that the slit formed by the electric heating wire cutting method is smooth and straight, and the operation is safe and convenient. Effect check: The quality of the slit for secondary processing of the insulation board is guaranteed.
3.2.3 Using the correct paste method, the mesh cloth is pasted from top to bottom, and the overlap length between the mesh cloths is not less than 100 mm; the length on the side of the corner of the outer wall is not less than 200 mm; at the seams It is overlapped with the overturning net; the part cut at the joint is overlapped by a mesh, and its length is not less than 100mm. Immediately after the crack-resistant mortar is scraped, the mesh cloth is pressed against it, and the pressure is pressed from the center. Wipe around and the mesh cloth should be pressed into the mortar to leave its surface. At the entrance and exit of the door and window, the package is processed, and the mesh cloth which is originally reserved is turned over along the end surface, and immediately pressed into the anti-cracking mortar of the surface layer with an iron trowel. Effect check: the mesh cloth is flat and war-free, and the pass rate is 97%. 3.2.4 Grasp the weather forecast, make rain prevention measures and contact the weather forecast department to understand the daily weather forecast and keep abreast of the changes in the daily report. Arrange the construction period reasonably and avoid the rainy days. Use steel pipe scaffolding around the parapet to set up a rain-proof outer shed to prevent the outer layer from wetting in the rain. Use drainage pipes for drainage of floor construction water to avoid leakage to the outer wall. Effect check: The outer wall surface is basically dry during the whole construction process, and it does not affect the construction of the insulation board and the mesh cloth. 3. 3 effect check insulation board glue å‚¥ æ ¼ æ ¼ 侪 侪 侪 粘贴 粘贴 粘贴 粘贴 粘贴 粘贴 粘贴 粘贴 粘贴 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过 通过
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