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Exterior insulation technology of building exterior wall and building energy saving
At present, building energy conservation is the trend of the times. In the building wall insulation, our country has invested considerable manpower, financial and material resources in building energy conservation, and has made certain achievements. But the research work is mainly limited to the building energy saving technology and building energy conservation policy, and the quality management and control of the construction phase. The system is still not enough to study the construction management process of exterior wall heat preservation in energy saving building. In the actual analysis of the foundation soil, the corresponding management measures and suggestions are put forward to improve the quality management level of the exterior wall insulation construction of energy saving building.
1 main technical features of external wall external insulation system
Heat preservation for external wall, whether external insulation, internal heat preservation or sandwich insulation, can improve the temperature of the inner surface of the exterior wall, and improve the indoor climate. However, the effect of external insulation is better.
You can avoid thermal insulation 1.1. When using the same thickness of insulation material, the external insulation is less than the internal thermal insulation loss of about 1/5, thereby saving energy consumption.
1.2 after the external heat preservation, the internal heat capacity of the solid wall is large and the indoor temperature can be stored more. The indoor temperature, such as the sun light or intermittent heating, is slow, the indoor stability is more stable and the life is more comfortable: it also causes the solar radiation, the human body heat dissipation, the household appliances and cooking heat dissipation. The "free heat" is better used and is beneficial to energy saving. In summer, the external heat insulation layer can reduce the entry of solar radiation heat and the comprehensive influence of indoor high temperature, so that the inner surface temperature and the indoor air temperature can be reduced. It can be seen that external thermal insulation is conducive to making the building cool in winter and warm in summer.
1.3 the temperature that indoor residents actually feel, both indoor temperature and inner surface temperature of enclosure structure, proves that it can also get a comfortable heat environment, even under the premise of strengthening external heat preservation and maintaining the quality of indoor thermal environment. Properly reducing room temperature can reduce heating load and save energy.
1.4 as the result of external heat preservation, the inner brick wall or concrete wall is protected. The changing outdoor climate causes the greater temperature change inside the wall inside the outer thermal insulation layer, which makes the inner wall of the main wall increase in winter, the humidity is reduced, the temperature change is relatively gentle and the thermal stress is reduced, thus the main wall is produced. The danger of cracks, deformation and breakage is greatly reduced, and the life span is greatly extended.
2 external temperature technology
Compared with the internal heat preservation, the external thermal insulation is reasonable and has its obvious superiority. The insulation material with the same specifications, the same size and the performance is better than the internal heat preservation. The external insulation technology is not only suitable for the new structural engineering, but also suitable for the old building. It is suitable for the wide range and high technical content. External insulation can protect the main structure and prolong the life of the building; it effectively reduces the heat bridge of the building structure and adds the effective space to the building; at the same time, it is eliminated. Condensing to improve the comfort of living.
2.1 external insulation external insulation
In the construction, the external insulation materials include rock (ore) cotton, glass wool felt, polystyrene foam board (polystyrene board, EPS, XPS), ceramsite concrete composite polystyrene imitation stone decorative insulation board, steel wire mesh sandwich wall plate and so on. Polystyrene board has been widely applied in external wall thermal insulation technology in the world due to its excellent physical properties and low cost. The technology is to paste and hang the insulation material on the external wall with adhesive mortar or special fixer, then apply the anti cracking mortar, press into the glass fiber mesh cloth to form the protective layer, and finally add the decorative surface. Another way is to use special fixings to fix all kinds of heat insulation boards that are not easy to absorb on the exterior wall, and then hang the aluminum plate, natural stone, color glass and so on on the premade keel to form the decorative surface directly. The external thermal insulation installation is time-consuming and difficult to construct, and the construction takes up the lead time. After construction is completed, the construction can only be completed. When carrying out high-rise construction, the safety of construction personnel is not guaranteed.
2.2 polystyrene board and wall forming
In the concrete frame shear system, polyphenyl plates are built into the building formwork in the concrete frame shear system, and the concrete is poured on the outside wall of the wall, and the concrete and the polystyrene board are poured into the composite wall at one time. The technology solves the main problem of external thermal insulation, and its advantage is obvious. Due to the primary survival of the external wall and the insulation layer, the work efficiency is improved, the construction period is greatly shortened, and the safety of the construction personnel is guaranteed. Moreover, during the winter construction, the polystyrene board plays the role of thermal insulation, which can reduce the insulation measures of the external enclosure. But when pouring concrete, we should pay attention to uniform and continuous pouring. Otherwise, the effect of concrete side pressure will cause the polystyrene board to be deformed and stubble after dismantling, and influence the post order construction. The built-in polystyrene board can be either double-sided wire mesh or single-sided wire mesh. The connection between the double-sided wire mesh polystyrene board and the concrete is mainly based on the binding of the inner steel mesh frame with the outside wall of the wall and the bond between the concrete and the polystyrene board. The bonding performance is good, and it has high safety. The connection between the single side steel wire mesh polystyrene board and the concrete, mainly depends on the adhesion of concrete and polystyrene board, the anchoring force of the inclined steel bar, L type steel and the concrete wall, and the combination of the concrete and the anchoring force of the concrete wall.