Examples of leakage survey and repair schemes for the housing surface of industrial plants.

Abstract
for the damage to the insulation layer of an industrial plant and the phenomenon of condensation and dripping on the equipment pipeline, the plant metal roof defect detection technology and system solutions are used. The technology uses the infrared thermal imager to determine the defects of the metal roof, and then uses the maintenance-specific waterproof film-filled system to carry out the overall renovation of the roof, after the renovation of the roof no longer leakage phenomenon, waterproof seal performance is good.
01 Project Overview
An industrial plant project roof using metal plate and rock wool composite steel plate as the main structural layer, metal roof panel is not waterproof breathable film and vapor film, resulting in indoor water vapor and external water into the interior insulation layer, so that its long-term water absorption in a saturation state . During the survey, it was found that the condensation and dripping phenomenon occurs in the roof panel between the 37-43 axis/B-E axis of the plant and the following equipment lines, and when the external environment humidity is greater, the more serious this phenomenon is, threatening the production and safety of the plant, and professional maintenance is required as soon as possible.
02 Site Survey and Cause Analysis
Site Drip Area Infrared Equipment Survey
According to the infrared equipment survey of the factory's housing surface, two drip areas were selected for field infrared scanning, and the infrared thermal imager converted the invisible temperature field into a visible thermal image through external temperature changes, and the defect site of the roof could be determined by analyzing the thermal image through special software. According to the analysis of map data, the survey temperatures of A, B and C in scan area 1 are 22.4 degrees C, 27.5 degrees C and 24.2 degrees C respectively, and the survey temperatures of D, E, F and G in scan area 2 are At 19.1 degrees C, 24.5 degrees C, 22 degrees C and 20.5 degrees C, the temperature in the dark area is lower than that in lighter areas, which proves that the water content inside the insulation layer in these areas is higher than other parts, and is also the key maintenance site.
the cause of leakage is
the design of water leakage is unreasonable. Because the metal roof panel does not have waterproof breathable film and vapor film, resulting in indoor water vapor and external water into the interior insulation layer, insulation layer long-term water absorption saturation, resulting in local insulation function failure, but also caused the waterproof function to lose its function;
Combined with the project site situation and equipment survey results analysis, the condensation area roof seam part seal is not strict, there is leakage and leakage phenomenon, so that indoor and outdoor moisture and air through the defective part of the circulation, resulting in the indoor roofing local areas of condensation, drip phenomenon.
Roof leakage control
construction process: grass-roots clean-up →d node consolidation→ additional reinforcement treatment→ large surface full of adhesive maintenance dedicated waterproof film→ edge treatment.
budget clean-up
thoroughly clean up the roof panel surface of garbage, dust, stains, the aging cracked waterproof, sealing materials to eliminate, and remove the silt at the trench, eaves, repair the broken parts of the roof panel.
node consolidation
the roof loose fasteners re-tightened, replace the rusted fastening screws, and tie the deformed part of the open to tighten the riveting. In addition, first remove the later reinforced steel strip, do a good job of marking, until the large-face waterproof film laying is completed and then restored.
additional reinforcement treatment
the metal plate mating site, the roof ridge upright lock edge, flat facade joint and other parts with maintenance-specific waterproof tape for intensive treatment. Take the lighting window and metal roof panel joint site as an example, the construction will first strengthen the steel belt removal, cleaning the tie-up edge and fastening belt, laying a 100 mm wide maintenance special waterproof tape for sealing reinforcement treatment, repeated roller pressure or scraping tight, until the completion of the large-faced paving to restore the reinforced steel belt.
Large surface full of adhesive maintenance special waterproof film
the use of maintenance-specific waterproof film full of adhesive system for the overall renovation of the metal roof, the system integrates fluorine film weather resistance and ultra-resistant membrane butyl rubber excellent air tightness, water tightness, with high weather resistance, sealing waterproof, barrier aging, self-cleaning, reflective insulation and other functions. Before the construction of the pre-laying, the natural relaxation of waterproof film coils arranged according to the outline on the original roof steel plate, smooth straight, not distorted, length and short edge mating width of not less than 80mm, and make appropriate tailoring, to ensure that the short side mating position in the original pressure-type steel plate valley
Construction, first open the coil end 30 to 50cm wide isolation film, flat paving on the roof panel, so that the glue surface and metal plate naturally close together, the isolation film from the finished product under the roll, will lead out of the isolation film roll, to avoid the film unevenly wrinkled coil. Edge scraping with scraping plate, so that the coil and the base tight paste, the joint site repeated roller pressure or scraping tight, the house panel fine concave surface needs to use scraper film evenly pressed into to ensure that the coil and the grass is completely tightly attached
Metal plate mating loose riveting fastening and then coating, filming, the use of homogenous tape for intensive treatment.
the receiving edge
water-resistant edge treatment with pressure strips, and then restore reinforced steel bars to ensure the oneness of the roof.
House renovation process schematic
Construction Precautions
waterproof construction should be carried out under temperature conditions above 5 degrees C, not in rain, snow and above 5 strong windy weather construction

Because of the strong light reflection on the surface of the white coil, workers should wear sunglasses to protect their eyes when construction,
in the lower roof of the daughter wall to do a good job of protection measures to ensure construction safety,
coils should not be concentrated on the roof surface, to avoid local overload caused by the roof grass deformation, while trying to avoid laying the roof walk, drag items, to avoid damage to the finished roof.
03
Conclusion
Due to the failure to set up waterproof permeable film and diaphragm, the project from the roof completed soon after the leakage, seriously affecting industrial production and safety. Through the specific infrared equipment survey and diagnosis means, scientific repair technology system and standardized construction technology, finally make the factory roof leakage problem can be solved, roof maintenance has not yet occurred leakage. The successful implementation of this project provides a new technical basis and experience for the detection and treatment of leakage in industrial plants.
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