Construction Engineering EPS board thin plastering external wall insulation system construction technology Zhang Guangxing 1 Chen Yong 2 EPS board paste exterior wall insulation system is a new type of wall insulation system and decorative features in one, and other types of architectural insulation Than, EPS board paste external wall insulation has a good overall insulation effect, small thermal conductivity, cut off the cold and heat bridge, no condensation point, good durability and so on.
At the same time, the weight of such systems is light, which can effectively reduce the load and foundation load of the load-bearing wall outside the building, and reduce the basic treatment cost of seismic fortification. This type of system is a building energy-saving insulation system that can be widely promoted and popularized.
The basic structure of EPS external wall heat preservation system is shown in Table 1. Table 1 Basic structure of exterior wall heat preservation External wall heat preservation method Adhesive layer Heat preservation layer Protective layer External facing reinforcement Reinforced concrete wall, block wall 1 clay brick wall 1 frame Rui Insulation Sticky Polystyrene Foam Alkali Resistant Fiberglass Mesh, 35mm Gree Water Resistant Cracking Plastering Mortar 4 Press Segments f Mercury To Do Mortar Board Exterior Finishing One, EPS Exterior Wall Insulation System Construction Technical issues At present, the domestic and foreign construction methods used for the paste of EPS boards for external wall insulation are all using the "flat paste" method. This kind of construction process is to apply the polymer adhesive mortar on the surface of the EPS board, and then paste it on the base surface of the outer wall. The area of ​​the wiper is required to account for 30 percent of the EPS board. Although this process can meet the required standards, The bond strength when the panel itself is in a positive wind pressure is guaranteed, but once it is in the state of a negative wind pressure, it may be torn from the side of the EPS board attaching surface. The main reason is that due to the sticking of the EPS board to the base of the wall, the stress on the surface of the outer wall is concentrated on the skin of the board, and 30-40% of the bonded area is the weak link where the force is destroyed. In other words, no matter if the cement is hardened after being hardened, it is just a layer of skin. Because the material quality of the polyphenyl plate is very soft, the molecular monomer has poor strength and is easily destroyed under stress conditions. The commonly used remedial measures are reinforced with anchor bolts, but this practice has certain requirements on the wall base. For example, low-strength blocks such as aerated concrete and perlite cannot make it. (1. Quality of Lushan County Construction Project Supervision station; 2. Pingdingshan City Construction Engineering Testing Technology Center). In addition, after adding anchor bolts, it will not only increase the cost, but also increase the construction difficulty and complexity.
From the "flat paste" to "three-dimensional paste" construction process, you can change the EPS board paste plane force conditions. After calculation, the average increase in paste area of ​​about 25%, can enhance the EPS board and the external wall of the tensile, compressive shear strength, which is a simple and easy, significant effect of the construction method. Mechanical treatment is applied to the surface of the adhesive. After pasting, several hundred cement nails each having a diameter of about 5 mm and a length of about 5 mm per square meter are formed on the base surface of the adhesive substrate. The nail cap firmly grasps the EPS board, and each glue nail forms a The independent force body not only disperses and reduces the external force on the benzene plate, but also increases the adhesive force of the external wall body to the benzene plate.
In construction, different protections can be done according to the requirements of the reserved holes. First of all, after the EPS board is finished, the outer surface is polished and leveled. At the same time, according to design requirements, the reserved hole is opened with a drill, and the inner liner material is selected according to different requirements. Ordinary holes can be lined with PVC pipe. Special requirements for holes can be made with thin-walled iron or steel pipes to make inner linings. Iron pipes must be protected against pounds both inside and outside. At the same time, the required PVC crucible or iron pipe) is sawed according to the required size and spared. Its length is equal to the thickness of the insulation layer plus 50-0mm. After the exterior wall thin layer is completely solidified, the surface of the hole is reserved. Press the "m" shape to cut, and press the sawed PVC pipe inward from the outer hole. When pressing in, the net cloth must be pressed on the outside of the PVC pipe. The pipe head is pressed into (below) the outer surface by about 5mm, and the nozzle is sealed with adhesive glue. The reserved holes treated by this construction method can well protect the EPS insulation layer.
When using a hanging basket for construction, there are few openings that need to be repaired. As for the wall surface constructed with scaffolding, there are a number of openings that need to be repaired. The method is as follows: After the scaffold is separated from the wall, the holes in the joint should be filled immediately and flattened with cement mortar.
Pre-cut a piece of insulation board of the same size as the hole and polish the edge part so that it can be tightly added to the reserved hole.
After the cement mortar has been cured for a period of time, the surface has been dried. Apply a proper amount of adhesive to the back of the board, press it into the hole, and press it flat.
After the adhesive is cured for 24 hours, it has a certain strength, and it is better to embed an anchor in the repairing insulation board.
Henan Science and Technology 2007.10 Construction Powder Spray Treatment Soft Foundation Construction Quality Control Quiet 1 Wang Fang 2 Chen Jianrui 2 Yang Baohong 3 Li Chaofeng 4 Powder spray is the abbreviation of “powder spray mixingâ€, which is the use of a special powder mixing rig to cement powder The solidifying agent is sprayed into the soft soil and the soft soil and the solidifying agent are forced to stir. A series of physical and chemical reactions between the solidifying agent and the soft soil are used to form soft soil into a cement body with a certain strength to form a composite. A construction method for the foundation. I combine the following experiments and specific engineering construction practices to discuss some of the quality control measures that should be taken during the construction process of the powder-jet treatment soft foundation.
I. Quality Control Measures Before Powder Spraying Construction 1. Strengthen the inspection of construction machinery and equipment.
Site construction personnel check before drilling: Each machine must be equipped with a recorder that can control the amount of powder sprayed per meter, and any operable buttons and switches on the recorder must not be used to set or operate time, depth, spray Powder weight, bit number, re-stir depth, re-stir times and other parameters; check the integrity and accuracy of the rig's meter and printer.
(1. Luoyang Luxing Highway Engineering Supervision Co., Ltd.; 2. Luoyang Highway Planning Survey and Design Institute; 3. Luoyang Municipal Health Workers Continuing Education School; 4. Zhengzhou Newcom Engineering Consulting Co., Ltd.) On-board barometer and tachometer , Ammeters, and electronic scales must be calibrated and unqualified instruments must be replaced. Draw a tick mark on each machine's drill frame to mark the depth of the eye.
The wear of the drill bit diameter shall not be greater than 1cm. The fuselage leveling shall be based on whether the drill pipe is vertical or not, and the drill string shall be used for control when operating. The mast of the host tower is marked with a tick mark per m, so that the drilling depth, re-stirring depth and re-stirring speed can be determined visually.
In order to ensure that the verticality of the construction can meet the design or specification requirements, a weight is hung on the main tower, and the verticality of the main tower is adjusted by the lifting and lowering of the legs of the rig to ensure the verticality of the drill pipe and the body. degree.
2. Strengthen the inspection of raw materials.
The cement used in the construction must have a factory certificate and a quality test report; for each batch of cement that comes in, the cement must be tested in a timely manner at the frequency of the various physical properties of the cement before it can be used.
After the cement enters the construction site, it is stored in a cement shed. The stacking of cement should meet the requirements of rainproof and moisture proof. It is forbidden to use expired, damp, agglomerated, and deteriorated cement. In order to prevent the cement from getting damp in the shed, planks need to be placed on the ground as support pads. After the cement is put into storage and out of the warehouse, the cement table is strictly registered to cut a piece of net cloth, the size of which can cover the entire repair area, and overlaps with the original net fabric by at least 65 mm. The operation of other steps is the same as the construction of the protective surface layer.
After many studies and experiments, polyurethane can be used as a bonding material for bonding benzene board joints. Polyurethane foam used as insulation material, in the state before the uncatalyzed reaction, is a polyvalent organic isocyanate liquid, such as honey, after catalytic reaction, the volume expansion of more than 30 times, a few minutes later to form a closed independent micro Foamed plastic foam. Polyurethane performance indicators are better than polyphenylene, the use of polyurethane liquid state before foaming, injected polystyrene board in the horizontal and vertical seams, in the foaming process, not only to fill the gap, but also The strong adhesion force makes the joints of the styrofoam foam glued together, avoiding cracks at the corner seams of the window.
From an economic point of view, in the construction operations, polyurethane saves benzene board, saves man-hours, and improves work efficiency. In addition, polyurethane can also be injected into weak benzene plate gaps and repair cracks. Polyurethane material can be selected from single-component polyurethane foam sealant, and use the spray gun to insert foam into the gap. After the gun is used up, it must be cleaned with special cleaning agent. The injection foaming time should be selected after the benzene board is attached. Before the plastering, the best one continuous operation and all the injections are completed.
EPS foam boards for exterior wall insulation must be completely closed after completion. However, due to the small diameter of various reserved holes, including air-conditioning pipes, natural gas pipes, and threading pipes, it is difficult to effectively treat the hole through the inner surface during construction. Poor handling and destruction of the EPS board directly affect the quality and overall service life of the external wall insulation system.
In addition, the external wall insulation often encounters arc-shaped walls to make it difficult to paste EPS boards. If the EPS board is cut into slender strips, the paste construction is very troublesome and destroys the integrity of the thermal insulation board. According to the actual situation in the construction, there may be the following practices: during construction, the standard insulation board shall be arranged vertically, and be cut along the length of the straight edge of the wallpaper knife. When pasting, the mouth will be curved to the outside of the curve. If the exterior wall has decorative components, it can be attached to On the inside of the balcony, after cutting the plate, the sticking method is simple, the overall thermal insulation performance is good, and the appearance is also beautiful.
Paste exterior wall thermal insulation system with EPS board is a new structural system that has been vigorously promoted and popularized by the country in recent years. All localities are improving relevant technical standards. It is believed that the construction technology of EPS board exterior insulation system will be continuously improved in practice. The better you do.
Henan Science and Technology 2007.10
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