Science and Technology Information bookmark0 Construction and Engineering EPS Board Thin Plastering External Wall External Insulation System Construction Technology Yu Chenjun1 Cheng Yanmiao2 (1. Xinpu Construction Group Co., Ltd., Zhengzhou 450052, China;. Zhengzhou First Construction Engineering Co., Ltd., Zhengzhou, Henan 450004, China) Cheng Zhong’s experience has systematically introduced the construction process of EPS boards, including the base layer, adhesive layer, insulation layer, plaster layer, and decorative layer.

The EPS board thin plastering system has been initially applied in foreign countries in the early 1960s. This type of external insulation system has a good thermal insulation effect, is safe and reliable during use, and has comprehensive economic benefits. In the application, it has been continuously improved and developed, and gradually became a relatively mature external insulation system, which was introduced to China in the 1980s.

An EPS board, namely a Styrofoam board, is an interconnected crucible honeycomb structure in which polystyrene resin particles are heated in a container and infused with a flame retardant and swelled into particles, in a process of natural health and aging. Plate.

Deformation of EPS boards generally takes two forms. The first is the deformation due to changes in temperature. This deformation is reversible. As the temperature recovers, the EPS board will return to its original shape and size. The second is shrinkage deformation caused by heat forming. It is generally called post-shrinkage. The shrinkage rate is faster in the initial stage after molding. As time goes by, the shrinkage rate gradually becomes slower and shrinks to a certain limit. After the value, it will no longer shrink. According to the on-site construction experience, generally after 18 to 22 days of Chen Fang, the EPS board's Rongzhong tends to be stable. Therefore, the sampling of the EPS board should be at least 18 days after the molding, and it is better to follow the national industry standard JGJ144-2004. The EPS board with more than 42 days has good stability, so as to ensure that the EPS board will not shrink after the wall, resulting in cracking of the entire insulation system.

Second, the EPS board exterior insulation system construction process: grass-roots: refers to the outer wall of the external insulation system depends on the external structure of the building, usually brick or reinforced concrete wall. During the construction process, the surface of the grass-roots level should not be too dry, and the oil on the surface of the grass-roots level should be cleaned up, and the release agent should be cleaned. The protruding, empty drums and loose parts should be removed and leveled. The surface layer must not be chalked, peeled, returned to alkali, etc. Phenomenon, if necessary, clean the wall with water, the wall must be cleaned before the net can be dry before the construction of the next process, if the flatness of the wall does not meet the requirements, but also applied 1: cement mortar leveling, the surface is not Calendering and guaranteeing no defects such as emptying, falling off, cracks, etc.

Adhesive layer: This is the adhesive material used between the EPS board and the base layer. When preparing the polymer mortar binder, according to the requirements of the manufacturer's instruction manual, the person in charge shall be responsible for it. The portable electric mixer may be used for stirring. The mixing ratio is usually water: powder material = 1:4, stirring with water The time for delivery shall not be less than 5 minutes. The stirring shall be sufficient, uniform, moderate in consistency, and have a certain viscosity. After the preparation is completed, it shall be allowed to stand for 5 minutes and stirring shall be performed before use. The formulated adhesive should pay attention to sun protection and wind protection so as to prevent water from evaporating too quickly. The binder should not be mixed too much at one time. When the binder is mixed, the binder is generally used according to the different opening time of the materials produced by different manufacturers. It should be used within 1 to 2 hours, and water can not be added or added after the plastic is overtime.

There are two ways to apply the adhesive: 1 point sticking method: apply a 5mm wide adhesive on the periphery of each polystyrene board with a trowel, and require gradually from the edge to the middle of the house, thickness 5mm10mm, average thickness stone wall surface The actual degree of flatness may be determined, and then wiped on the polystyrene board 6 to 8, thickness 10mm, diameter of about 100mm circular binder ash cake, evenly distributed in the backbone of the board. The point-adhesion method is suitable for the poorly flattened wall surface.

2 sticking methods: apply adhesive on the back of polystyrene board, then use a professional trowel to make a 45 degree angle with the board surface, tightly scrape the insulation board, leaving some adhesive tape on the board surface, bandwidth 10mm, Thickness 13mm, spacing 10mm, paste extrusion on the wall. The sticking method is applicable to walls with good flatness.

After the polyphenyl board and the base layer adhesive are compacted, the coverage area of ​​the adhesive is not less than 40% of the surface area of ​​the board to ensure that the wind load, safety factor, and on-site construction uncertainty affect the bonding strength. . When adhering, it is not allowed to adjust the flatness between the plates by means of up and down, right and left shifts, but should be adjusted with a rubber hammer to prevent the adhesive from overflowing between the plate and the plate due to the left and right movement of the polystyrene plate. The formation of cold bridges within the gaps has a negative impact on the insulation effect of the external insulation system.

In the external thermal insulation system, the adhesive is subjected to the full load of the system. For buildings larger than 20 meters, the vibration is generated due to the high wind pressure, which affects the firmness of the bonding. In this case, the pressure of the system should be considered. Large parts use anchor bolts to assist wind pressure fixation.

Insulation layer: EPS insulation board, which is the key link in the external insulation system. If the pressure on the polystyrene board is not controlled enough, the natural health will not be aged for 42 days according to the requirements of JGJ144-2004 “Insulation Technical Specifications for Exterior Walls”. , It is used in the construction of the project. As a result, due to the high shrinkage rate of the sheet, the localized shrinkage and uneven temperature stress of the polyphenylene sheet occur, causing cracking of the board's indirect joint until it falls off.

Plastering layer: It is composed of cementless screed and glass fiber mesh cloth, and plays a key role in the prevention of cracking, waterproofing and impact resistance of the external insulation system. If inferior mesh is used, the water will directly affect the impact resistance of the surface layer. If the alkali resistance of Wangebu is poor, it will be corroded by the alkalinity of the cement in the surface layer for a long time, and the tensile strength will be reduced to make the surface layer. There is cracking and shedding.

During construction, the plaster is evenly applied to the surface of the insulation board, and the thickness is 3 to 4 mm. Immediately cutting the pre-cut alkali-resistant mesh cloth into the plaster with an iron trowel, the adjacent mesh cloth is laid. Width not less than 50 mm, and must not make the grid folds, empty drums, Alice. The first floor should be paved with a double-layer mesh cloth, with the first storey reinforced, the second storey common type, and the two-story mesh cloth to be full of plaster. The two sides of the inner corner of the female corner are overlapped with each other, and the overlapping width is not less than 200 mm. Additional 300x400 meshes should be added to the four corners of the door and window openings, and the direction of the shop should be 45° to resist cracks at the corners of the hole. At the position of the reserved hole, the grid cloth is disconnected, and the location of the sparse layer must be considered in order to compensate for the overlapping of the grid cloth and the original large-area grid cloth.

Finishing layer: that is, the exterior wall paint, the choice of finish material should pay attention to the compatibility and matching between various materials, otherwise, the finish layer will crack, peel or peel due to the drying shrinkage or temperature difference deformation. Such phenomena.

Third, the development prospects of EPS external insulation systems With the continuous improvement of building energy conservation and environmental awareness, all countries in the world have given full attention to this, from the formulation and implementation of laws and regulations, the research and development of new materials, various Many efforts have been made to try and perfect the construction process. China is a world leader in energy production and consumption. Energy conservation is of immeasurable significance. All of these are good prospects for the development of exterior insulation systems.

(Continued from page 227) Machinery and equipment are moving in the direction of high power, large size, and high work resistance. Only by making the machinery and equipment scientifically and reasonably fit together, can we achieve the high output and high efficiency of mines. At present, the supporting equipment for the fully mechanized coal mining face has been atlas, and the user can select and reconfigure it according to the actual situation. This article has a certain theoretical and practical guiding significance for improving the scientificity of the selection of the comprehensive mining equipment and better serving the production and service. .

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