Abstract: In addition to ensuring the quality of the screen body, the pillar-type LED display has another important point that must be considered. That is the pillar of the LED display. The safety of the outdoor LED display can be investigated from the following three Aspects.
In addition to ensuring the quality of the screen body, the pillar-type LED display has another important point that must be considered. That is the pillar of the LED display. The safety of the outdoor LED display can be investigated from the following three aspects .
01. Check the base of the LED display column
There are two main types and layouts of the base: 1. One is the balanced gravity type, that is, the upper load is mainly balanced by a large volume of basic gravity, generally a concrete base. This base form is suitable for use when the soil is soft and there is an open construction site. 2. The other is a pile foundation type, in which the hole-expanding pile is the main type. This type of base method can be selected under the condition of limited construction site. When judging the base of the advertising screen, the initial drawings and construction materials must be checked first, and then the base must be excavated under the conditions agreed, to find out whether the base mode, buried depth, scale and other conditions are consistent with the drawings, and The base bolts of the LED display screen are subjected to strength sampling inspection. When selecting other gravity-based advertising screens during the on-site survey, special attention must be paid to whether the foundation soil around the root of the steel column is raised or loose, and formed after the foundation is shaken under wind If the surface of the soil is collapsed, it means that the anti-overturning of the base can no longer meet the requirements. At any time, there is a risk of collapse under the action of strong winds, and it must be reinforced immediately.
02. Check the material of the column and the quality of the connection with the foundation
First, the deflection of the steel column of the LED display must be measured. The deflection of the steel column cannot be greater than 1000 / H. It must be measured in two directions; second, the quality of the steel tube column of the advertising screen, and the appearance of the steel It can be divided into uniformity, whether there are items such as interlayers, cracks, non-metallic impurities and significant segregation. When there is doubt about the quality of steel, the safety of structural members should be ensured. Finally, check whether the steel pipe column is corroded and the quality of the steel structure protective coating. The quality of protective coatings for steel structures shall be tested in accordance with the relevant national product standards.
The outdoor LED display steel pipe column and foundation are generally bolted or welded. If the bolts are connected, check whether there are missing bolts during the inspection. The bolts must not be damaged by deformation, slippage, etc .; if there are design drawings, the specifications and models of the bolts should meet the design requirements; If the corrosion is serious, it must be replaced immediately, and the bolt fastening should be firm and reliable; for high-strength bolts, the embedding depth of the bolts should meet the requirements of the specifications.
03. Inspection of the upper steel frame rod system
At present, the connection between the steel column and the upper steel frame rod system is usually in the following two forms: 1. One is T-shaped, and its main skeleton is formed by the steel column and the upper horizontal main beam in a T-shaped fixed connection. The LED display screen is connected to the T-shaped rigid frame structure through various pendants and diagonal braces. 2. The other is a space truss type, the main skeleton of which is welded by an independent steel column and several horizontal main beams parallel to each other, and the main beams are connected by horizontal and diagonal supports to form a space truss system. The display is directly mounted on the main frame.
Due to the top-heavy weight of the outdoor LED display column, there will be some hidden safety hazards after a period of use. The main structure of the LED display must be regularly inspected and maintained to ensure safety.