What problems do you need to pay attention to when building color steel?

Color steel plate construction is not casual, it needs to pay attention to a few problems, from the following aspects to read what problems should be paid attention to in the construction?

First, there are two fixing methods for color steel plate installation: penetrating type and concealed buckle. Penetrating fixing is the most common way to install roof and wall color steel plates, that is, using self-tapping screws or rivets to fix the color plate on the support (such as purlins), and the penetrating fixing is divided into wave peak fixation, trough fixing or a combination thereof. Concealed locking fixing is a special concealed buckle that matches the concealed buckle color plate to be fixed on the support (such as purlins) first, and the mother rib of the color board and the center rib of the concealed buckle are fixed in a fixed method, which is generally used for the installation of roof panels.

Second, the lateral and end lap of the color plate. When installing each steel plate, its side lap should be accurately placed on the previous steel plate and clamped with the previous steel plate until both ends of the steel plate are fixed. A simple and effective method is to use a pair of clamp pliers to clamp the steel plates that are lapped separately. When the steel plate is in place along the longitudinal direction, its end, especially the upper end, needs to be clamped with pliers to clamp the lap part, which can ensure that one end of the steel plate is in place, and the lap joint at one end is also in the correct position, so as to fix the steel plate, in the process of fixation, the clamp should always clamp the steel plate in the longitudinal direction. Each plate must be completely secured before the next plate can be installed. The fixation must start in the center of the plate, then stretch to both sides, and finally fix the lap edge of the plate. For end lap, since the roof and wall profile panels are made by continuous processing, the steel plate can be supplied according to the length limited by the transportation conditions, usually without lapping, and the length of the steel plate is sufficient to meet the needs of roof laying.

For on-site handling and transportation considerations, if necessary, two shorter steel plates can be used to cover the entire length by lapping at the ends, and each column of steel plates is joined in the order from bottom to top, and then the next column is lowered. For roofing and wall steel plate end lap using the penetrating fixing method, it is necessary to position it on the support. For roofs with a slope between 1/12 (50) ~ 1/4 (150), the overlapping length of the end of the steel plate is at least 200mm; When the slope exceeds 1/4 (150), the overlapping length is at least 150mm, and the midpoint of the overlapping part of the end of the steel plate should be in the center of the support. The minimum overlapping length of the wall panel is 100mm.

Third, the selection of self-tapping screws. When selecting the fixing screw, the fixing parts and color steel should be selected according to the service life of the structure, and special attention should be paid to whether the life of the covering material is consistent with the life of the specified fixing part. At the same time, pay attention to the thickness of the steel purlins should not exceed the self-drilling capacity of the screws. Screws are available today with plastic heads, stainless steel top covers or coated with a special durable protective layer. In addition, except for the screws for concealed buckle fixing, all other screws are equipped with waterproof washers, and corresponding special washers are equipped for lighting panels and special wind pressure.

Fourth, the installation of color plates is easier to master, and the processing of some details is more important. For roofing color panels, the color board should be edged accordingly on the roof and eaves, the purpose of which is to prevent rainwater from entering the roof more effectively.

Where the roof exterior panel is on the ridge, the chassis between the ribs of the steel plate can be folded upwards with the edge pulling tool. It is used at the upper end of all roofing steel sheets with slopes below 1/2 (250) to ensure that water blown in by the wind under the flashing or cover does not flow into the building. The edge operation can be carried out before the positioning of the steel plate or after the steel plate is installed, but the latter method should leave enough clearance (about 50mm) at the top of the steel plate to facilitate the operation of the edge pulling tool. The specific operation method is: position the edge pulling tool on the steel plate terminal chassis, and slide the tool on the steel plate as soon as possible, the more miles the better. Hold the steel plate terminal with a tool and fold the chassis upwards, about 800 upwards. As mentioned above, bend each chassis. When the plate is used on a roof with a slope of less than 1/5 (100), the bottom end of the steel plate should be slightly bent down (lip-shaped), which can be achieved with the same edge pulling tool, so as to ensure that rainwater is discharged along the end of the steel plate and will not flow back to the lower side of the flat chassis due to capillary or wind action.

The downward folding operation must be fixed after the roof steel plate is fixed, otherwise this operation will be hindered. When the edge end of the lower folding plate, properly open the mouth of the lower pry tool, clamp the tool to the chassis end, and push it inward as much as possible. The tool is attached to the end of the chassis while shaking the handle by about 200 so that a downward hem is formed at the end of the steel plate.

For very long roofing steel plates, telescopic nodes should be set up at a distance not greater than the data listed in the table below in order to overcome longitudinal thermal displacement. For the penetration fixed type, only one penetration fixed lap can be set between the two telescopic nodes.

In general, of all the metals used for roofing and wall paneling, steel has by far the lowest thermal expansion and contraction.

In fact, the expansion or contraction displacement between the terminal and the final support of the steel plate is only a small part of the data shown in the table, because the fixed steel plate displacement usually tends to each end of the steel plate from the center. The amount of displacement at each end is only half the amount of expansion or contraction. There are also some temperature change displacements in the building structure or roof frame, which, although not as large as the roof, still reduce the displacement between the roof panels and their supporting surfaces. Ultimately, this differential displacement is further reduced due to the buckling of the purlins, especially in the span.

The profile plates have corresponding molded foam seals. When embedded between the eaves support surface and the underside of the roof panel (used as an eaves seal), this bottom seal prevents dust, insects, birds, rodents and rainwater from entering the rib space.

A contoured molded strip can be embedded under the flashboard and between the top surface of the roof panel along the underside of the flashboard and the cover, and properly fixed with double-sided adhesive, thus acting as a similar seal. This is important because not doing so will cause water leakage in the house.

Fifth, in the south color board

is generally designed as a single-layer color board, in order to reduce solar radiation heat into the interior of the building, when installing the roof panel, you can install thermal insulation in the roof system. A very simple, cost-effective method is to lay a double-sided reflective foil film on the purlins or slats before installing the roofing steel plates, which also acts as steam isolation to reduce coalescence.

Do you understand the above matters that need to be paid attention to in the construction of color steel? If you want to consult more, you can directly call the following consultation number and get in touch with Xirong steel structure.