Analysis on the Gutter of Heilongjiang Steel Structure Maintenance System

Overview of 1. Roof Maintenance System Gutter
Gutter is an essential component in roof drainage system. Gutter is mainly used to temporarily collect rainwater and drain it away through downpipe. Try to use external gutter, small size, but also when the cornice trim. The color is suitable, and the installation of exquisite gutters and finishes will undoubtedly add a lot of color to the decorative effect of the whole project. 
 

2.Heilongjiang steel structureCommon Problems in Gutter Fabrication and Installation
Advantages and Material Selection of (I) Color Steel Plate Gutter
In a large steel structure plant,color steel plateThe amount of steel used in the gutter is also a large part, but the color steel gutter also has its own advantages, and the wind load in the coastal area is generally relatively large. If the color plate gutter is used, under the strong wind load, the color steel plate gutter is fragile and weak, and is easily lifted by the suction of the wind. The design quality of the color steel plate gutter also has a great influence on its durability, so the design and material selection of the color steel plate gutter can not be ignored.
The most commonly used gutter material is 1.2mm, 2mm or 2.5mm thick stainless steel; 3mm or 5mm thick galvanized color steel plate; according to the importance of the building, cost, the use of other materials grade comprehensive consideration. The depth of the gutter in general civil buildings shall not be less than 250mm, and shall be reasonably determined according to the clearance between the bottom of the roof slab and the top of the roof truss, and the space required for adjusting the slope of the gutter shall be considered. Two factors should be considered when determining the width: first, whether the drainage can pass through should be calculated; Second, the commonly used gutter board width is 1.0m, 1.2m and 1.5m in three specifications. The board shall be used reasonably as far as possible. The gutter must be designed to be retractable for buildings with high requirements.
(II)color steel plateWater Leakage Treatment at Overlap of Gutter
The gutter plate can be overlapped by 100mm, and the overlapped part is connected by rivets. If you want to ensure that the gutter does not leak, you can use waterproof glue to make it. The specific method is to overlap the color steel plate gutter with two neutral silica gel (acid glue and alkaline glue cannot be used, and the compatibility and durability with the color steel plate are problematic). The sealing positions are 10mm away from the edges of the two overlapping plates respectively, and the overlapping parts are fixed with two waterproof rivets. The center distance of each waterproof rivet is 80mm, and the two are distributed in the wrong way. The rivet shall be hit on the sealing line. Note that pull rivets should be waterproof and should not be used with pull rivets that penetrate in the middle. After such careful construction, there is still a water leakage problem, which may be that the silica gel is not full. Rivet rust through; The colored steel plate at the rivet is rusted through. Silicone failure. The main reason for the failure of silica gel is that ultraviolet radiation causes the polymer chain to break, and the life of good silica gel in the color steel plate should be very long.
(III)Heilongjiang steel structurePlant steel gutter sagging treatment
In the construction of steel gutter, it is sometimes found that the phenomenon of deflection under the gutter will occur when the column distance is large and the gutter thickness is small. The solutions are:
1. Set up a long tie beam under the gutter and serve as the support of the gutter to ensure that it will not sag, or make a support below. It is best to weld the gutter with a larger slope in the middle. During installation, try to avoid walking in the gutter to avoid scratching.
2. With the welding combination of gutter, the middle of the gutter arch to both ends of a certain slope can completely solve this problem, but the right and wrong will cause the gutter processing costs to increase.
(IV) gutters and downspouts
The size of the steel gutter does not have much to do with the area of the roof. The height of the steel gutter is consistent with the height of the purlin. The main thing is the number of rainwater pipes. The accumulated water area of rainwater pipes is generally not more than 180 m2 according to the accumulated water area of rainwater pipes with a diameter of 110mm. The rest is calculated on this basis. In this way, the water in the ditch will not overflow. If precise values are required, they must be calculated according to the formula. 

 

(V)Heilongjiang steel structureWhether it is necessary to find slope for the inner gutter in the factory building
color steel plateIn theory, gutters can be used to find slopes, and the specifications are 5. But there are very fewHeilongjiang steel structureThe company will go to the slope, only the node is not high processing is more troublesome. In fact, I have always thought that it is the concept of concrete tiangou to find slopes. Concrete tiangou is required to find slopes due to its large friction coefficient and poor drainage. The surface of the color steel plate is much smoother than the concrete, the resistance to water is very small (the friction coefficient is small), and because the color steel gutter stiffness is larger, if the stainless steel gutter, the gutter bracket will be added, and the water will gradually discharge, the load is small, the deflection is not very large, so even if there is water, it is very little, will soon volatilize. Moreover, the rainfall in the northwest region itself is quite small, so there is no need to find slopes in the gutter. Moreover, the outer gutter plays a beautiful decorative role, and it is difficult to be uniform when installing the outer wrapping edge of the gutter after finding the slope, so the outer gutter does not need to find the slope.
In fact, it is also very difficult to find the slope of the inner gutter, especially when the color steel gutter is used for about 9m, there will be deflection in the span, the part resting on the top of the column will be higher, and the downpipe cannot be all made in the span. even if the neoprene waterproof layer is used to find the slope, it can only be slightly flattened. therefore, in general, water will definitely accumulate in the depression after the roof, therefore, we have repeatedly requested that the anti-corrosion performance of the color steel gutter must be better. However, it is not easy to find slopes for color steel plate gutter. Such data can be obtained by calculation. Slope can be found according to the minimum 5‰. If there is a downpipe of 9m, the height difference between the two ends of the gutter needs 45mm. This is difficult to make, and the overlap of the gutter is also difficult to deal.
If it is in rainy areas in the south, it is suggested that the inner gutter should be 2% sloped. In this way, attention should be taken in the design and manufacture. During the design, the cross sections at both ends of the gutter should be divided into high and low sections. The steel plate cutting should be cut according to the slope. During the manufacture, the high section and the high section are welded, and the low section and the low section are welded to make a long sloped inner gutter.
(VI)Heilongjiang steel structureImprovement of Steel Gutter Design in Factory Building
In the field construction can find a lot of design is not appropriate, to the processing production and installation of a lot of trouble, such as incolor steel plateIn the design of combined gutter, the gutter designed with old design ideas sometimes brings inconvenience to the construction during installation. Why does the bottom plate and outer plate of the gutter have to be 90 degrees straight knot? When the upper edge of the gutter is reinforced by bracing, the middle of the outer plate of the gutter is slightly raised, and the veneer of the gutter cannot be close to it during installation. When the outer plate and the bottom plate are welded, tilting outward at a certain angle will bring convenience to the installation of the edge of the gutter. Through the installation of the large edge under the gutter, the height of the bulge can be ignored, and the dust is not easy to adhere, thus reducing the number of cleaning. Although a small discovery, it has reduced a lot of human and financial resources. 

 

3. epilogue
To sum up, in the Heilongjiang steel structure roof maintenance system, in order to make the gutter play its due function and play a good decorative effect, the following principles should be followed:
1. The rationality of the design. The design should conform to the standard, according to the local environment, roof area size, design a practical, economic, beautiful gutter.
2. Strict quality control. Calculate the size from the setting out, reduce the error, and avoid the deformation of the components in the production and transportation.
3. Fine installation. Skilled and fine installation will make the decorative effect completely natural.
The above summary comes from the experience and discovery of the construction site, and the building structure often shows individual characteristics, so it is necessary to formulate an appropriate construction plan according to the actual project.
For more exciting content, please visit the official website of Heilongjiang Zhongjie Steel Structure Engineering Co., Ltd. www.hljzhongjie.com
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