Application of new technology in the heat preserva

Application of new technology in EPS board exterior wall insulation construction

EPS board pasted exterior wall external insulation system is a new structural system integrating wall insulation and decoration functions. Compared with several other building insulation forms, EPS board pasted exterior wall external insulation has the characteristics of good overall insulation effect, small thermal conductivity, blocking the generation of cold and hot bridges, no condensation points, good durability, etc. At the same time, the self weight of this kind of system is light, which can effectively reduce the load of the bearing wall outside the building and the foundation load, and reduce the foundation treatment cost of seismic fortification. This kind of system is a building energy-saving and thermal insulation system that can be vigorously promoted and popularized

at present, people pay much attention to how to effectively enhance the overall bonding strength between EPS board and exterior wall base, how to solve the horizontal and vertical joints at the corners of door and window openings, how to save materials and improve work efficiency, how to deal with the sealing and protection of various reserved holes, and how to solve the pasting construction method of EPS board on arc wall (balcony). In fact, the construction process of EPS board pasting external wall insulation at home and abroad adopts the "plane pasting" method. This construction process is to apply polymer bonding glue on the surface of EPS board, and then paste it on the base surface of external wall. It is required that the area of plastering glue should account for 30 ~ 40% of EPS board. Although this process can meet the specified standards and ensure the bonding strength of the board when it is under positive wind pressure, it may be torn from the side of the EPS board bonding surface once it is under the frequency vibration state of negative wind pressure. Why is the number of the test object such a situation? Because after the EPS board is pasted with the base surface of the wall, the stress on the surface of its outer wall is concentrated on the surface of the board, and 30 ~ 40% of the pasted area is the weak link of the stress damage. In other words, no matter how hard the adhesive mortar is after curing, it is only adhered with a layer of skin. Because the material quality of polystyrene board is very soft and the strength of molecular monomer is poor, it is easy to be damaged under stress. The commonly used remedial measure is to reinforce with anchor bolts, foot switches, etc., which has certain requirements on the foundation surface of the wall. For example, low-strength blocks such as aerated concrete and perlite cannot be used. In addition, after adding anchor bolts, Will greatly increase the material cost and "Labor cost also increases the difficulty and complexity of construction.

how to solve this technical problem?

from the perspective of mechanics, if the skin force of benzene plate is transferred to the overall force of benzene plate, the weak link of skin force can be transferred, and the plane force can be changed into a three-dimensional force, which increases the absorption and reduction of external force of benzene plate as a whole, and the bonding strength between benzene plate and external wall can be effectively increased. From" plane pasting " Using the "three-dimensional pasting" construction process can change the stress state of the EPS board pasting plane. After calculation, the average increase of bonding area is about 25%, which can enhance the tensile and compressive shear strength of EPS board and exterior wall. This is a simple and effective construction method. Using the "three-dimensional bonding" construction process, the bonding surface of EPS board is mechanically treated with the simplest method. After bonding, hundreds of small cement glue nails with a diameter of about 5mm and a length of about 5mm per square meter are formed on the bonding wall base. The nail cap firmly holds the EPS board, and each glue nail forms an independent force bearing body, which can not only disperse and reduce the external force on the benzene board, but also increase the bonding tension of the external wall base to the benzene board

at present, the construction technology commonly used in the corner construction of door and window openings is that EPS plates within 200mm are not allowed to leave horizontal and vertical joints, in order to prevent the corner joints from cracking in the process of being affected by the change of external ambient temperature. Theoretically speaking, this process requirement is correct, but in the actual construction process, there are many difficulties. During construction, it shall be pasted in the order of plates, and the corners of doors and windows shall basically encounter horizontal and vertical joints. If the benzene plate at the corner of the door and window is cut 200mm in advance and pasted as required, and then the rest of the parts are pasted, small pieces of plate must be used for splicing. Although there are no horizontal and vertical joints in the corners, many joints are left in the rest of the parts, which seriously destroys the overall insulation effect of the insulation layer. Because of the collage of edges and corners, all kinds of benzene board edges and corners cut off are collected and reused, which will also leave many seams, and the operators are unwilling to use them because they are too time-consuming. If it is not picked up and used, it will cause waste of benzene board materials. Therefore, this construction method not only increases the material loss, but also increases the construction difficulty, and finally increases the comprehensive cost of the insulation system, with a total capacity utilization rate of about 73%; Chlor alkali has suffered losses in the whole industry for three consecutive years