1. Usually, the diameter of the depressed part of the high pole lamp is chosen as the bottom diameter + 100-150; If the bottom diameter of the lamp post is 500, the diameter of the recessed part should be 600-650.

2. The height of the lamp pole is one tenth of that of the lamp pole. For example, the height of the concave part of the 25m lamp pole is 2.5m.

3. The excavation depth is one-seventh that of the lamp pole. For example, the excavation of a 25 m long light pole is about 3.5 m (less than 15 m, the calculation is based on one-eighth to one-ninth)

4. The excavation width is usually 3-4 times the standard of the concave part. For example, the excavation width of a 700 diameter recessed section should be 2100 (depending on the weight and height of the lamp pole) 15 m or less, usually 2-3 times.

5. In general, recessed parts longer than 15 m should be equipped with decorative flanges to prevent deformation of recessed parts. Usually, a thickness of 6-8 cm is sufficient. There is a 150-200 tap hole in the center that can be passed through the pipeline. The standard of decorative flanges is the same as that of chassis.