膨胀螺丝用途是将灯箱底座与其下面的水泥方墩固定。
The purpose of the expansion screw is to fix the light box base and the concrete pier below.
水泥方墩要求砌在地面以下位置，方墩大小由广告灯箱的重量和大小而定。
The concrete pier is required to be built in the following position, and the size of the square pier is determined by the weight and size of the advertising light box.
虽然说广告灯箱的的重量不轻，但为了防止恶劣天气对广告灯箱的影响，还是先砌一水泥方墩为好。
Although it is said that the weight is not light, but in order to prevent the impact of bad weather on the advertising light box, or to build a cement square pier is good.
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