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.
研究了在不同入射波向时每个方墩的群墩影响系数随墩距变化的规律并与折算圆墩的结果进行了比较。
Using Bretschneider spectrum as incident wave spectrum, the grouping coefficients of square caissons are obtained for various incident wave direction and caisson spacing.
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