In addition to ensuring the quality of the screen body, the pillar type outdoor fixed LED billboard display has an important aspect that must be considered, that is, the pillar of the LED display. The inspection of the safety of the pillar of the outdoor fixed LED display can be carried out in the following three aspects. .
01. Inspection of the base of the LED display column
There are two main forms and layouts of the foundation: 1. One is the balanced gravity type, that is, the upper load is mainly balanced by the large-volume foundation gravity, which is generally a concrete foundation. This base form is suitable for use when the soil is soft and has an open construction site. 2. The other is a pile foundation type, which is mainly a reamed pile. This type of foundation method can be selected under the condition of the limited construction site. When determining the base of the advertising screen, it is first necessary to check its initial drawings and construction materials, and then excavate the base if the conditions agree, and check whether the conditions of the base method, burial depth, and scale are in accordance with the drawings. The outdoor fixed LED screen display base bolts are sampled for strength testing. For other site surveys, when choosing an advertising screen with a balanced gravity foundation, special attention must be paid to the presence or absence of foundation soil bulges around the roots of the steel columns, and the foundation formed after the foundation is shaken under wind load. The collapse of the soil surface, if any, indicates that the base's anti-overturning has failed to meet the requirements, and there is a danger of collapse under the action of the strong wind at any time, and it must be immediately reinforced.
02, check the material of the column and the quality of the connection with the foundation
First of all, it is necessary to measure the distortion of the steel column of the LED display. The distortion of the steel column cannot be greater than 1000 / H, and it must be measured in two directions. Second, the quality of the steel of the advertising screen steel pipe column and the appearance of the steel It can be divided into uniformity, whether there are interlayers, cracks, non-metallic inclusions, 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 steel structure protective coatings shall be tested in accordance with the relevant national product standards for the quality of coatings.
Outdoor fixed LED sign display steel pipe columns and foundations are generally bolted or welded. For bolted connections, check for missing bolts during the inspection, and the bolts must not be deformed, slipped, loosened, etc .; if there are design drawings, the specifications and models of the bolts must meet the design requirements; the bolts must be rust-proofed. If the corrosion is serious, it must be replaced immediately, and the bolts should be fastened firmly and reliably. For high-strength bolts, the depth of the bolts must meet the requirements of the code.
03 、 Inspection of the upper steel frame member system
At present, the connection between the steel column and the upper steel frame member system is usually in the following two forms: 1. One is T-shaped, and the mainframe is formed by the T-shaped fixed connection between the steel column and a horizontal main beam on the upper part. The LED display screen is connected to the T-shaped rigid frame structure through each pendant and diagonal support. 2. The other is a space truss type, whose main skeleton is welded by an independent steel column and several horizontal main beams parallel to each other. The main beams are connected by horizontal and diagonal supports to form a space truss system. The display is mounted directly on the mainframe.
Due to the heavyweight of the pillars of outdoor fixed LED billboard display, there will be some safety hazards after using it for a period of time. The main structure of the LED display must be regularly inspected and maintained to ensure safety.