The maintenance of membrane structure is related to the design, aesthetics, function, environment and so on, especially the material and environment, which is directly related to the service life of the building. In general, the tensile membrane structure building is not necessary to maintain, but in the later stage it must be maintained. Bad weather should be checked at any time, the membrane structure of the life of the building generally in the 15 to 30 years, the impact of membrane structure life has many factors, but the most important thing is to learn how to maintain and maintenance, so as to prolong the service life.
There are six factors to consider when maintaining the tensile membrane structure:
1, anti-corrosion. Corrosion prevention measures and materials should be selected according to the environment of the membrane structure site. Regular inspection of the supporting structure, cable, splint and bolted joints and other places of corrosion protection. If there is corrosion, first we have to remove the anti-corrosion layer, and then re-do the surface of the anti-corrosion treatment. If the bolt connection is corroded, it must be replaced.
2, clean. The fouling on the membrane surface is related to the local environmental conditions, membrane properties and the shape of the membrane surface. From a technical point of view, the membrane structure does not necessarily need to be cleaned. In the case of most membranes, cleaning does not prolong the working life, and conversely, improper cleaning can shorten the life of the material. Clean the membrane structure should be guaranteed not to destroy the surface treatment layer of the coating film material. Therefore, scrubbing agents, hard brushes and high-pressure water cannons are not allowed. In addition, the cleaning personnel must wear soft-soled shoes when walking on the membrane surface.
3, repair. In the installation process will inadvertently or intentionally caused minor damage to the membrane surface, at this time can be repaired on site. The basic fiber cloth and coating should be regularly inspected, for small holes can be directly on the outside side of the membrane welding patches to repair, patches must be rounded, should be welded surface dust, grease and grease to clean up. Repair PVC membrane material is generally used hot gas welding. PVDF surfaces in the weld zone must be carefully removed. With the long-term effect of ultraviolet radiation PVC coating will become brittle, on the old film roofing welding is more difficult and weld instability. Therefore, some processors recommend the use of adhesive repair.
4, replace. Preserving all processing drawings throughout the lifetime of the structure makes the membrane replacement very simple. The new membrane material should be re-tested to determine its compensation value. If the original width of the membrane material is out of stock, you need to re-cut the design. It may also be necessary to re-shape the structure based on the specific dimensions of the existing support structure. Before replacing, the steel frame, cable, splint, bolts, nuts and other structural originals should be inspected to determine whether to continue or replace. The continued use of the splint and steel should be cleaned, and to check whether the corrosion occurred. All corrosion layers should be removed and adequate protective measures should be adopted. The corroded or damaged steel cables should be replaced completely.
5, stagnant water and drainage. If stagnant water is generated, it is necessary to immediately remove stagnant water or snow. If the rain and snow continues, the water will make the membrane damaged, so the public to close the space covered by the film, and immediately take measures to avoid new water. Due to the deformation of the membrane structure under the load, there may be stagnant water in the lower slope of the film surface. When rainfall or snowfall is large and snow melts, the tensile membrane structure should be tested to avoid stagnant water.
6, pre-tension and two times pull. The stability of membrane structure depends on the retention of prestressing force inside the membrane structure. The level of prestress affects the deformation of the membrane under the action of load. Because the membrane structure in the continuous action of the load will cause relaxation, so during the use of the membrane internal prestressing will change. The properties of the membrane material used for a particular structure can be determined by biaxial experiments and applied in prestressed design. There are two ways to treat the relaxation and creep during the use of the membrane material, one is to apply a higher initial stress at the time of installation, and the other is to implement two pulls after a period of use.
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