Light steel structure has been developed rapidly in recent years due to its light weight, high degree of industrialization, fast construction speed, short cycle, excellent comprehensive economic benefits, good seismic performance, environmental protection and beautiful appearance. Industrial plants and civil buildings, but also bring some new problems in use. Because the roof of light steel structure is mainly composed of color profiled steel plate and color steel sandwich panel, the plate has light weight, high strength, rich color, convenient production and installation, quick construction, good seismic performance, fireproof, waterproof and durable. Durable, maintenance-free, etc., it has a certain strength, stiffness and anti-corrosion performance, and generally there is no possibility of water leakage. However, if the seams between the plates are not handled properly, the roof will often leak. Therefore, the connection of the roof color steel profiled board is the most important link in the roofing system, and the design, material selection and construction of the color steel roofing must be highly valued.
Reasonably determine the slope of the roof. Standard roof drainage design
In terms of design, the design specifications should be strictly followed, and the design indicators should not be reduced at will because of the cost savings. At the same time, the design should be combined with the actual situation of the construction site. For areas with large rain and snow, when the building roof span is large, the slope of the roof should not be less than 10%. Design roofing purlins should be conservative, not blindly saving steel, and reducing the height of the purlins. The height of the purlins is high, which helps to prevent uneven downward deflection of the roof and avoid the water in the house.
Seam construction treatment measures for color steel roof panels
Long-term lap processing
When the slope of a single slope is less than 12 m, the roof may not have a transverse joint; when the slope of a single slope is greater than 12 m, a transverse joint is required between the panels. The transverse joint is generally lapped with water. In order to ensure the waterproof effect, a certain lap length must be satisfied, and the length of the lap length is related to the slope of the roof. When the slope is less than or equal to 1/10, it is generally not less than 300mm; when the slope is greater than 1/ At 10 o'clock, it should not be less than 200mm, and it is required to be staggered at the height of the lap joint. A waterproof sealing strip is attached between the upper and lower plates. This not only effectively prevents water seepage, but also prevents oxidation corrosion at the steel plate incisions. At the same time, it should be noted that the lap joint is generally fixed at the peak position by a self-tapping screw. If it is placed on the trough, it must have reliable waterproof measures.
The roof low-wave color steel plate is directly connected to the stringer with a connecting piece, one wave per wave or one wave, but a connecting piece must be provided at the overlapping wave. The roof high-wave color steel plate is connected to the fixing bracket by a connecting piece, and one wave is arranged. Another method for connecting the upper and lower plates is a plate pressing method. A galvanized steel plate having the same color as that of the color steel plate is disposed on the upper and lower sides of the two color steel plates, and a waterproof sealing strip is arranged between the two plates, and the fastening plate is used for fastening the bolts. Tightly squeezed together. In order to avoid water leakage caused by the long lap joint of the board, the pressure plate production equipment can also be transported to the site for installation, rolling the entire roof panel from the ridge to the cornice, and installing while rolling, without long-distance lapping, avoiding Unnecessary leakage. Under normal circumstances, it is best to use long plates without overlapping, but in actual engineering, it is found that when the plates are too long, the expansion and contraction of the plates will cause the expansion of the screw holes to cause leakage; at the same time, because the plates are too long, they are manufactured. It is easy to damage the coating during transportation or construction, which affects the quality.
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