What are the causes of water leakage in various parts of Dongguan steel structure factory building?
Steel structure workshops mostly adopt color steel plate maintenance system, which has certain strength and rigidity. The qualified materials will not leak water. The reason for water leakage in the maintenance system is mainly whether the node treatment is appropriate, the quality of the materials, the maturity and completeness of the system design. The structural structure and installation technology also directly affect the waterproof effect of the enclosure system, and of course the ambient temperature and construction operation process. The leakage is summarized according to the location and is mainly distributed as follows: 1. The ridge of the steel structure factory: The main reason for the leakage of this part is: the peak at the ridge is too high, the roof slab can not guarantee waterproof; the longitudinal lap is not laid waterproof, forming a gap and leaking; the ridge cover is longitudinally overlapped with rivets, and the thermal expansion and contraction strength is not enough. The rivet is broken to form a water leakage; no plug is placed between the roof slab and the roof panel, or the plug is placed irregularly and falls off to form a leak. 2. Steel structure factory housing gas building parts: The main reason for the water leakage in this part is that no foam plug is placed under the junction of the gas building and the roof, and the longitudinal lap joint is not laid waterproof; the outer roof of the roof is not on the junction of the gas building; The hole part is not waterproofed; there is a hidden danger of water leakage in the gas building itself. 3. Steel structure plant lighting board parts: The waterproofing of the lighting plate is an important part of the waterproofing of the maintenance system. The laying of the rubber in the installation of the lighting plate and the waterproof screw are the main hidden dangers of the leakage of the roof; the plate type of the lighting plate does not match the shape of the roof panel, and the peaks on both sides of the lighting plate are higher than the roof panel. After installation, the sealing is too strict to form the difference between the inside and outside of the lighting panel. The capillary water leaks from the gaps on both sides of the lighting panel into the interior of the roof; the length of the longitudinal overlapping of the lighting panel is not enough, and the aging of the cement loses its viscosity; the longitudinal clay falls off; the lighting panel and the color steel plate There is a rigid overlap between them, and the gap in the middle is not sealed. 4. Opening parts of the roof of the steel structure factory: The opening of the color steel plate roof must be both to solve the appearance and to solve the problem of roof waterproofing. These two problems must be determined according to the opening form and the model of the color steel roof panel. The main reason for water leakage in this part is that the fan opening is not waterproofed according to the design node, and the steel plug is not laid waterproof; the reserved area around the fan opening is small, the rainwater is not smooth, and water is easy to accumulate; The lap joint is not waterproofed; no structural parts are added around the inside of the opening to form low-concave water; water-proof construction has water-blocking phenomenon and forms water. 5. Mouth part: The main source of water leakage in the mouth is the main reason for the leakage of the part: the roof outer panel is installed without foam plugging, the roof outer panel is not pulled down; the wall outer panel is not long enough, and the cornice is not waterproof. 6. Gutter parts: Lap joints and bridging seams are two key parts of water leakage. Compared with reinforced concrete roofing, the gutter depth of steel roofing is small, and there is no continuous waterproof structure between gutter and roof. When it is accumulated in gutter, it is difficult to guarantee Leaking water. The main reason for water leakage in this part is that there is a gap between the welded joints of the inner gutter and water seepage; the pipe diameter of the gutter and rainwater pipe is too small, which does not match the length of the plant; the end of the gutter does not have a head plate; If the length of the gutter is insufficient, the water will flow into the interior of the plant. 7. Rain cover parts: The main reason for the leakage of this part is that the interface between the awning and the attached room is not properly handled; there is no plug between the awning and the outer wall or it does not protrude into the outer wall panel according to the design requirements. 8. Steel structure workshop and attached room interface: The main reason for water leakage in this part is that the construction is unreasonable, and the installation of the interface does not meet the design requirements. 9. Brick wall and light steel roof connection: This part is easy to form a hidden danger of water leakage, and the water leakage at the joint between the roof panel and the cement wall surface is mainly caused by the stress being out of synchronization, causing the structural wall and the steel plate to be cracked and leaking. 10. Aluminum alloy window parts: The connection between the aluminum alloy window and the color steel wall and the brick wall is one of the waterproof problems. The main reason for the leakage of this part is: there is a gap between the wall purlin and the aluminum alloy; the window bottom and the steel structure, the brick wall and the window The sealing between the glass and the profile is not strict; there is a large gap between the window sill and the table degree or there is a phenomenon of reversing water; the water-filled edge piece on the window is not waterproofed during installation. 11. Analysis of other causes of water leakage: 11.1 Design reasons: (1) The roof drainage system does not provide overflow measures according to the specifications. When the storm intensity exceeds the discharge capacity of the rainwater system, it will exceed the lap joints and even flood the roof, causing accidents; (2) The number of downpipes is insufficient, the rainwater flows far along the gutters, and the time is long, causing drowning; the L-shaped edge parts are not added to the outer wall of the wall, causing hidden dangers of water leakage inside the gutter; (3) The design of color steel flooding fittings is unreasonable and cannot achieve waterproof effect. (4) The specification specifies the deformation control value of the component, the deflection of the beam L/180, the deflection of the roof beam L/180 (where L is the span of the bent member), the cross-section design of the roofing beam is too small, the spacing is too large, under the wind load The deformation of the purlin and the profiled sheet will be too large; (5) The effects of structural deformation, temperature difference deformation, dry shrinkage deformation, vibration, etc. are not fully considered, and the fortification does not satisfy the need for deformation of the base layer. (6) The slope of the light house roof of the portal frame should be taken from 1/8 to 1/20. In areas with more rain, the larger value should be taken. The slope of the roof in the south should not be less than 5%. In the actual design project, many engineering roofs are too small, and roof rainwater cannot be discharged into the gutter in time. (7) There is a phenomenon of reversing water in the design of the awning, which causes leakage of the awning; 11.2 improper selection of materials: (1) Plastic pipes for rainwater pipes are of poor strength, and the steel structure plant is easy to be damaged from installation to commissioning. (2) Because the steel gutter is relatively thin, the weld is prone to problems. (3) The shape of the plate type and the roof color plate of the appropriate lighting plate is not selected according to the slope of the roof. The peak is small and the side overlap is too small, which is not conducive to drainage. (4) The color plate of the enclosure is too thin. After a period of use, the outer panel is corroded or deformed by temperature, and the gap between the panels is increased. (5) The quality of the galvanized layer of the pressed plate substrate is not good, and the coating is too thin, so that the pressed plate has a short service life and is easily corroded and damaged; (6) The self-tapping screw pad is easy to crack and the glass sealant is easy to aging. (7) The gusset plate is obviously deformed, and the height and spacing of the adjacent two plates are different; the rivet pull nail should be waterproof rivet. 11.3. Construction measures: (1) Plugging is effective for water leakage caused by wind, and should not be ignored. For example, to ensure that the color steel plate and the roof slab plug are installed in place, the lower part of the plug between the lighting plate and the roof slab is reinforced, and the roof fan is colored. A steel plug is placed at the end of the wave crest of the steel plate to enhance waterproofing; (2) When the lap joint is easily affected by the temperature, the lap length should be sufficient; (3) Water should be unsuitable for plugging. Generally, sealant is applied inside the steel plate during installation. (4) The adverse effects of thermal expansion and contraction of the steel structure roofing system must be paid enough attention to take reasonable structural measures: 11.4 During use: (1) The load on the roof raft is arbitrarily increased, resulting in deformation of the roof panel. (2) There is more pollution in the rainwater and there is water blocking. (3) Waterproof glue and sealant are aging, and necessary maintenance is lack of during use. 5, review Steel structure roof leakage is not an individual phenomenon, and there are many factors that cause water leakage. In order to solve the problem fundamentally, it is necessary to design seriously, determine a reasonable design plan, do a good job (the end of the waterproof layer), two seams (deformation joint , divided into three parts (water drop, entrance, mouth) and four (daughter wall roots, equipment roots, pipe roots, chimney roots) and other parts of the flooding structure.
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