No person, unless exempted under the provisions of section 8-3-2 of this chapter, shall encroach, obstruct, or cause any encroachment to be placed upon, in, or under any public street, alley, sidewalk, parkway, or other public property without a permit issued under the provisions of this chapter. (1962 Code §§ 7-2.04, 7-3.02, 7-3.04, 7-3.29, 7-1.27)