Classification And Reliability Appraisal Of Outdoor Column Type LED Display

Publisher: Supplier of LED Display Time: 2017-02-21 10:23 Views: 2314

Outdoor LED display has become an important media equipment for advertising, and it can be seen in urban commercial streets, high-rise commercial districts and squares. The investment cost of each outdoor LED display is very high, so how to use it safely for a long time is a problem that manufacturers and advertisers are very concerned about. The following is the sharing of Lianchengfa:

 

Outdoor column type LED displays are classified into single column LED displays and double column LED displays according to the size of the screen. Due to the stronger load-bearing effect of double columns, double column displays will be used for larger screens. It is mostly installed in places with a wide view and relatively open space, such as squares, parking lots, etc. In addition to the steel structure of the screen body, the column LED display needs to be made of concrete or steel columns, mainly considering the geological conditions of the foundation. Reliability appraisal of outdoor column type LED display.

户外立柱式LED显示屏
  

First, conduct identification and testing on the basis of the column LED display.

Balanced gravity type: the upper load is mainly balanced by the gravity of the mass foundation, which is generally a concrete foundation. This foundation form is suitable for use when the soil is soft and there is an open construction site. Pile foundation type: Among them, reamed piles are the main ones. This type of foundation type can be used when the construction site is limited. When appraising the foundation of the advertising screen, the original drawings and construction materials must be checked first, and then the foundation must be excavated when conditions permit, to find out whether the foundation form, buried depth, size, etc. are consistent with the drawings, and the advertisement The screen foundation concrete is sampled for strength testing. In addition, for advertising screens with balanced gravity foundations during site surveys, special attention must be paid to whether the foundation soil is uplifted or loose around the roots of the steel pillars, and the soil surface is formed after the foundation shakes under the action of wind load. If there is a collapse, it means that the anti-overturning of the foundation can no longer meet the requirements, and there is a danger of collapse under the action of strong wind at any time, and it must be reinforced immediately. Under normal circumstances, this kind of situation is rarely seen in the column LED display with deep pile foundation.

 

Second, inspect and appraise the material of the column.

Inspection of the connection quality between the steel column and the foundation: the advertising screen steel pipe column and the foundation are generally bolted or welded. For bolted connections, check for missing bolts during inspection, and the bolts must not be deformed or slipped or loosened; for design drawings, the specifications and models of the bolts must meet the design requirements; the bolts should be rust-proofed. If the corrosion is serious, it must be replaced immediately. The bolts should be fastened firmly and reliably; for high-strength bolts, the number of exposed threads should be 2 to 3 threads, and 10% of the bolt threads should be exposed to 1 or 4 threads; bolts are embedded The depth must meet the requirements of the specification. Inspection of the steel column: firstly, the tilt of the steel column of the LED screen must be measured, and the tilt of the steel column must not be greater than 1000/H. It must be measured in two directions; secondly, the quality of the steel column of the advertising screen must be tested. The appearance quality inspection can be divided into items such as uniformity, whether there are interlayers, cracks, non-metallic inclusions and obvious segregation. When there is doubt about the quality of the steel, samples can be taken from the components to inspect the mechanical properties of the steel and analyze the chemical composition, but the safety of the structural components should be ensured. Finally, check whether the steel pipe column is corroded and the quality of the protective coating for the steel structure. The quality of protective coatings for steel structures shall be tested in accordance with the current relevant national product standards on the quality of coatings.

 

Third, the inspection of the upper steel frame member system.

At present, there are two types of connection between the steel column and the upper steel frame member system: 1. One is T-shaped. The body area is connected with the T-shaped rigid frame structure through various pendants and diagonal braces. 2. The other is a space truss type. The main frame is welded by an independent steel column and several parallel horizontal main beams on the upper part. The main beams are connected by horizontal and diagonal supports to form a space truss system. The LED display is directly installed on the main frame.