Due to its good thermal insulation performance and excellent waterproof performance, polyurethane is widely used in exterior wall insulation, roof insulation and cold storage, grain storage, archives, pipelines, door windows and other special parts of the insulation. Today we will take a look at the polyurethane spray construction process and the polyurethane spray construction process. We hope to help everyone.
Polyurethane spraying construction process Polyurethane spraying process
First, the construction points
1, construction preparation
The basic wall shall meet the requirements of the Code for the Acceptance of Construction Quality of Concrete Structures (GB50204-2002) and the Code for the Acceptance of Masonry Construction Quality (GB50203-2002) and the corresponding basic wall quality acceptance standards, and shall pass the inspection and acceptance. The performance index of polyurethane should meet the requirements of JC/T998-2006 "spray polyurethane rigid foam insulation material". Walls should be clean, free from oil and dust. Holes in construction holes, scaffold eyes, and cracks in balcony boards and walls shall be repaired with mortar; windows shall be loosened and weathered parts shall be removed. The error of the flatness of the grass-roots wall shall not exceed 3mm.
2, system construction flow chart
3, environmental requirements:
a. Meteorological conditions during construction work should meet the following conditions: The ambient temperature during on-site spraying operations should be 15°C to 40°C, but should not be lower than 10°C or higher than 40°C; the wall moisture content should be 9%, and the wind strength should not be greater than The relative humidity of 5m/s (Grade 3 wind) should be less than 80%, and construction is not allowed on rainy days. When the ambient temperature during construction is less than 10°C, reliable technical measures shall be taken to ensure the spraying quality. No work under high humidity or exposure to sunlight.
b. Technical conditions for construction and operation of external insulation are as follows:
Outside along single- or double-row steel scaffolds, steel pipe door scaffolds; from the wall decorative surface should be (00-2.5 meters), the largest place does not exceed 5 meters; with no more than 1.2 meters of fences; its construction must In line with the current national security technical regulations. Scaffold erection should meet the spraying progress requirements.
c. Polyurethane white material and black material should be sealed and stored in a dry, ventilated, cool place. The storage temperature of white material should be 15°C～20°C. It should not exceed 30°C. Do not expose to sunlight. The storage temperature of the black material should be 15°C-35°C, it should not exceed 35°C, and the minimum storage temperature should not be lower than 5°C. The polyurethane white material and polyurethane black material have a shelf life of 6 months. Polyurethane white and black materials should have sun protection measures during storage and transportation.
Second, the primary treatment
Walls should be cleaned, cleaned of grease, dust removed, etc. Loose walls and weathered parts should be removed. The wall surface roughness is controlled within ±3mm. If the base layer deviation is too large, mortar should be used for leveling. Remove all defects, adhesion of external walls, oil stains, and expansion of concrete beams. The height of projections is less than 6mm. The masonry is treated with steel nets between beams and columns, and steel nets are widened to a width of 200mm on both sides of the joints. Doors and windows are installed and partially filled.
Third, hang vertical, elastic control line
Expand bolts at the top of the wall and the bottom of the wall to serve as a hang-up point for large wall-hanging wire. High-rise buildings use a theodolite to drill and hang lines. Multi-storey buildings use a large wire to suspend and suspend the fine steel wire and tighten it with a tightener. The steel vertical lines are installed on the large and negative corners of the wall. The distance from the steel vertical line to the wall is the total thickness of the insulation layer. After the thread is hung, the flatness of the wall is first checked on each floor with a 2m-feet, and the squareness of the wall is checked with a 2m-stranding board. Only flatness requirements can be achieved.
Fourth, the construction process
1, the door window and other parts of the shelter
Before the rigid polyurethane foam is sprayed after the polyurethane prefabricated parts are bonded, the shielding work shall be done well. The door window and the like are generally cut with a plastic cloth cut into a piece of cloth corresponding to the area of ​​the door window. For the pipe, iron and other irregular parts need to be protected by plastic film winding protection.
2, spray polyurethane moisture primer
Use a spray gun or roller brush to evenly spray the polyurethane moisture-proof primer without penetrating the bottom. Spray twice for a time interval of 2 hours. Humidity of the weather, appropriately extended intervals, with the first dry surface as the standard.
3, spray hard polyurethane foam insulation layer
Open the polyurethane sprayer to spray the rigid foam polyurethane evenly on the wall surface. Multi-layer spray method: start spraying along the top corner of the wall, first top 0.5mm bottom layer, then apply multiple layers of thickness 20mm to spray polyurethane foam Form multilayer foam. The heat storage effect of the cold storage is better, and the strength of the polyurethane foam is higher, and cracking and shedding will not occur.
4, spray polyurethane interface mortar
Polyurethane insulation layer is finished and polyurethane insulation should be fully matured for 24-48h, and then the polyurethane interface mortar construction process, using a bucket or roller brush evenly sprayed polyurethane interface mortar on the surface of rigid polyurethane insulation layer. Uniform coverage can not have missing spray or leaking brush. After spraying 12-24 hours of polyurethane interface mortar, construction of the next process is carried out. Be careful not to spray the polyurethane interface mortar on rainy days.
5, hang vertical line
About 100mm from the top of the floor and about 100mm from the bottom of the floor, and about 100mm from the overcast or sun corner of the big wall, vertical ash cakes should be made according to the vertical control line (they should be completed together when the floor is higher) as a reference ash. The pie, and then the line of reference between the two gray cakes in the vertical direction,
The thickness of the gray screed of the wall-leveling screed is made, and the distance between each ash cake is affixed at an interval of about 1.5 m. The gray cake can be made of granules made of polystyrene powder, and can also be cut into 50mm x 50mm pieces. After the gray cake is fixed in the vertical direction, the horizontal control line is pulled between the two horizontal gray cakes. The specific method is to insert the small garden nail with a small line into the gray cake and straighten the small line so that the small line control is slightly higher than the gray cake by 1 mm. Between the two ash cakes, several gray cakes or punching ribs are horizontally affixed at an interval of about 1.5m.
Each layer of gray cake paste construction work after the completion of the horizontal direction with 5m small wire pull to check the consistency of the ash cake, the vertical direction with the 2m pallet check the verticality, and measure the thickness of the ash cake, the thickness of the rampen should be consistent with the thickness of the ash cake. Check the consistency of the thickness of the punching bar with a 5m small cable and record it.
6, leveling layer wipe powder polystyrene particles
When the powdered polystyrene particles are used to insulate the slurry, the deviation of the flatness should not be greater than ±4 mm, and the thickness of the plaster is slightly higher than the thickness of the gray cake. Insulation pastes are applied from top to bottom and left to right. After smearing the entire wall, use a ruler to wipe back and forth across the wall to make up for it. Finally, press it again with iron trowel to make the surface smooth and uniform in thickness. Insulation surface depressions are smoothed with a thin slurry, and trowels can be used to flatten the raised areas. After wiping the insulation surface for 30 minutes, use a trowel to wipe the wall again, first horizontally and then vertically, and then use a wire ruler to reach the acceptance standard. Insulation slurry construction should pay attention to the cleaning of floor ash, landing ash should be used in a small number of times to re-use.
7, laying galvanized steel wire mesh
Wiping powder polystyrene granule insulation layer (72 hours later) galvanized steel mesh flat, with expansion nails and pressing pieces pressed, the nails should be uniform pressing force, stencil butt. The partial gap between the steel mesh and the insulating layer should not be too large. Splicing at the stencils is carried out with double strands of 22# galvanized tie-in straps with a spacing of 200-250mm. The stencil joints at the outside corners are spliced ​​with a double-stranded 22# galvanized tie-in cable at a distance of 100-150mm. The edges of the corners must be pressed with expansion nails (Note: The connection of the steel wire mesh must be staggered to not less than 50mm.) Galvanized steel wire mesh anchor nails.
8, anti-cracking mortar
The mortar with a good anti-cracking mortar from the center of the wire to the trowel around the trowel leveling, the wire mesh should not be leveled within the mortar level, the construction is completed 3-7 days and the construction quality of the insulation layer acceptance, you can Anti-crack construction.
9, allow deviation items and test methods.
The above about the polyurethane spray construction process and polyurethane spray construction process is briefly introduced here, and I hope to help you. For more information, please visit this website. Stay tuned.
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