Building Construction Technology Application and Quality Control of Exterior Wall Insulation Construction Technology Wang Yu Shaanxi Province Fifth Construction Engineering Co., Ltd. 710032 Xi'an) A layer of heat insulation material to block indoor and outdoor heat through the wall material plastic polystyrene board (XPS) Species. Expanded polystyrene board insulation effect is better (guided to send a copy of the Wei Wai wall to protect and decorate the role. Ishine heat.. .0 2 P weight in recent years, the state has strengthened the construction quality of energy-saving construction projects, 2007 In the year, the state formulated a number of corresponding systems and measures, and “Code for Acceptance of Construction Energy Conservation Engineering Quality (GB50411-2007)†was implemented on October 1, 2007. The building energy-saving project will be used as a division project of the unit construction project. Acceptance of the acceptance of the divisional engineering can only be completed after acceptance of the construction of the unit project, which shows that the building energy conservation project has been incorporated into the project quality system and the wall energy conservation project is a sub-project, in which the heat loss of the exterior wall cladding structure is relatively large and the external wall is developed. Insulation technology has become an important part of building energy efficiency.
Most areas in Shaanxi Province are cold areas. In recent years, the external wall insulation has gradually changed from the original external wall insulation to external wall insulation. At present, the external insulation methods of Shaanxi Province for construction projects include: polystyrene powder, polystyrene slurry, external wall insulation, polystyrene foam, thin plastering, external wall insulation, cast-in-place concrete, built-in insulation board, and external insulation. And so on. The outer wall insulation of rubber powder polyphenylene granule slurry has not been used since the heat insulation effect is not ideal; the cast-in-place concrete template has built-in heat insulation board external wall insulation. After several projects have been used, the quality is not good enough to control. Now used Less; Polystyrene foam board thin plaster external wall insulation application is more extensive. This article only discusses polystyrene foam panels and thin plastering exterior insulation.
1. The basic principle of external wall insulation: Exterior wall insulation is the advantage of external insulation on the outer wall of the building's exterior wall. The advantages of exterior insulation are: Compared with exterior insulation, external insulation has a significant Advantages: good energy-saving effect; protection of main structure, prolong the life span of buildings; can eliminate the influence of “heat bridgesâ€; help to improve the indoor environment; help improve the waterproof and airtightness of walls; The area of ​​use of the house is conducive to the transformation of the old house; it has a high overall economic efficiency.
3 Insufficient outer wall insulation: The external wall insulation is more difficult to construct than the outer wall insulation. It is necessary to use the outer frame or hanging blue construction. The wall area is large, the flatness and verticality requirements are high; the external insulation system itself is durable. Not as good as the durability of the main structure and internal insulation; common external insulation of organic thermal insulation material is not high fire performance; external wall insulation projects should not be used to paste decorative tiles do decorative layer; when used, its safety and durability Sex must meet the design requirements.
4 Application of exterior wall thermal insulation construction technology: 4. Styrofoam foam board thin plaster external thermal insulation technology is to use adhesive mortar or special fixed parts, the polystyrene foam plastic board fixed on the outer wall, and then wipe The polymer anti-cracking mortar is pressed into a glass fiber mesh to form a reinforced protective layer and finally added as a decorative surface layer. Styrofoam is mainly used for expanded polystyrene board (EPS) and extruded m). The price is relatively cheap and the strength is slightly lower. (0 Long-term moisture resistance is poor, but it can usually meet the energy-saving insulation requirements of building walls. Generally, there is no need for interface. Treatment; Extruded polystyrene board itself has high compressive tensile strength ((025*05MPa) heavy bulk density ((35*50)kg/m) thermal conductivity (Q03Wm.K) is lower than EPS board thermal insulation effect is better than EP board with the same thickness) but the price is more expensive, the interface needs to be processed before construction.
42 Construction process: Base wall treatment ※ line-up typesetting - sticking polystyrene board - installation of fixed parts ※ dividing grid concave lines wipe the bottom layer of polymer mortar - pressed into the grid cloth, wipe surface layer of polymer mortar ※ decorative surface layer.
43 Quality Control of Plaster Foam Plaster Thin Plaster External Insulation 431. The base wall must be clean, free of dirt, oil-free, empty and loose.
432 must be placed on the layout.
433 Install insulation boards according to typesetting, proceed block by block from inside corners or side of window openings; polystyrene boards should be horizontally glued, and the top and bottom two rows of polystyrene boards should be vertically offset by 1/2 board length to ensure minimum stitching Size not less than 200mm At the corner of the wall, the size should be arranged to ensure that the polystyrene board at the corner is interlaced and interlocked: The insulation board should be placed on the top of the door and window openings, and no horizontal stitching shall be allowed except for seams between floors. Seam joints, vertical joints from top to bottom consistent, find the width of the patch is not less than 600mm When installing, attention should be paid to the board joints tightly stitched, the board surface is flat, when the board seam exceeds 1.5 when packing with polyphenylene sheets; should increase the bonding area as much as possible To meet the requirements of wind pressure destruction. The tensile bond strength between base layer and adhesive should not be lower than 0 3MPa. The bond interface disengagement area should not be more than 50%. 5 Common External Quality Problems for External Wall Insulation Common External Heat Insulation Engineering Quality Problems: Adhesion plates tend to shift Bits, hollowing and shedding; cracks on the surface of the protective layer or the appearance of external facing bricks off; external thermal insulation project moldy, condensation or even cream; the wall heat transfer coefficient does not meet energy-saving standards is more common.
6 Factors affecting project quality 61 Grassroots structural factors: uneven non-uniform settlement; deformation of masonry of frame structure; scaffolding openings, etc. are not solidified, and local insulation layer is not used, resulting in local hollowing of insulation layer, long-term seepage after cracks, and empty Drum or partial shedding.
62 Insulation structural factors: leveling mortar and emptying of the main wall, especially long-term seepage; the surface of the insulation board is overloaded, and it is easy to peel off the insulation directly to cause shedding; the use of negative wind pressure resistance measures is unreasonable; architectural decoration modeling structure Cracks, hollowing, long-term water seepage, frost heave, etc., are formed as a result of the formation of large stresses with the surrounding structures.
62 Insulation material performance factors: The density of the insulation board is too low; the self-stress of the insulation board is too large, and the formation of negative pressure causes partial hollowing or damage to the insulation board.
62 supporting product factors: thermal insulation board bonding glue and other ancillary products: bonding glue and anchoring directly affect the degree of firmness of the insulation layer, is also the main reason for the quality of external insulation projects. Miscellaneous types of adhesive paste can not meet the requirements of the reliability of bonding EPS; Unreasonable gradation of the glue caused a decline in the overall performance; improper selection of anchors causes potential emptying, displacement or shedding.
62 construction factors: point sticking method, when the bonding area is less than 30% and no anchors are fixed, potential hidden dangers of loose drums are formed; when the sticking method is used, the size of the adhesive glue groove is too small and it is full of stickiness. Or heat insulation board joints glued to death, the formation of drainage, exhaust is not smooth and expansion and contraction stress caused by the internal pressure peeling hollow drum; nail sticking way, the adhesive glue is too thin immediately after bonding adhesive anchor pressure Too large, making the insulation board “deformation and opening†and false bonding, and the anchor and the wall form an invalid connection, which may cause potential damage; 62 Other influencing factors: After the construction of the insulation layer, the construction and installation of the doors, windows, air conditioners, downspouts and other types of work in the later period Man-made damage; sealant should be applied at the place where the sealant is not sealed, and the insulation layer can be infiltrated with water for a long time and frozen.
7. Summarize the situation of destroying the exterior wall decoration members without displacing the formation of the push-ishin insulation board into the flatness can not meet the circumstances such as (turn to page n41) bookmark3 polystyrene foam board thin plaster external insulation in recent years in Shaanxi With a wide range of applications, the Company's use of the ABC Dong Building in Xi'an University of Architecture and Technology, the high-rise residential building in the C-dong of the Northwest Electric Power Design Institute, and the use of high-rise residential buildings in the Northwestern Power Design Institute ensure that the verticality and flatness can be guaranteed, and no cracking or other phenomena can be observed. Because the quality of the external insulation depends on the quality of the external shear wall, the partial shear wall is not even, and the external insulation is not properly processed before construction. When the minimum thickness of the 900 is 10900, the minimum thickness is 120. The riser of the balcony should be prefabricated as much as possible and welded with the embedded part of the pick-up plate. When the canopy and the balcony have inclined decorative plates, the steel plate of the plate is placed on the upper surface of the inclined plate, and the sealing plates on both sides of the wall ring beam (ie, the double-layer reinforcement plate of the picking plate) can be anchored through the lower part of the horizontal pick plate. Taibai board sealing, steel wire welding with steel and Thai board, do not have to use concrete structure.
The same size and additional ribs on the opening of the kitchen, toilets, electrical appliances and equipment shall not necessarily be anchored into the plate support. The LIP may be anchored from the hole. The additional ribs on the opening of the board can only be reinforced under the board if the board at the opening has only a positive bending distance; otherwise, additional ribs should be added on the board. The slabs left after being left in place shall be marked with dashed lines to indicate the scope of the slabs, and shall be marked with one level of expanded concrete. Before the pouring, effective support measures should be taken.
3 Basic plans and detailed drawings: Flexible foundations should be adopted when the width of the base under the wall is wider (greater than 2 meters and may be narrower in some areas) or the foundation is uneven and the foundation is soft. Should take into account the unfavorable factors of the bi-directional re-use of the base area at the node, and appropriately widen the foundation.
When the width of the hole on the basis of leaving a hole and the first layer opening a large hole is greater than the bottom to the base height, if the bearing capacity of the foundation in the area of ​​the opening is to be taken into consideration, the lower base of the opening should be made of dark beams. Or reduce the base locally.
Under the plain concrete foundation, it is not necessary to make a cushion, but when there are dark beams in it, it should be noted that the thickness of the protective layer at the bottom is 70 or a cushion. When the groundwater level is high or during winter construction, the lime soil foundation must not be used. The rigid foundation is generally at least 300 thick.
If the wall below the ground is weakened by the pipe ditch, the adverse effects of earthquake resistance should be taken into consideration. The underground wall should be thickened or a reinforced concrete ditch frame should be added.
Seismic joints and expansion joints are not provided below the ground. However, the wall foundation on both sides of the settlement joint must be separated.
The new building foundation should not be deeper than the existing foundation.
If it is deeper than its original foundation, the net distance between its bases should not be less than 1.5 to 2 times the height difference between the bases.
The base ring beam should be lowered at the entrance of the building or on the floor of the ground floor room. When the top height of the foundation ring beam is 0060, the moisture barrier layer can be eliminated. When the base is uneven, a base ring beam should be added to the base.
According to standards and
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