Any snow, ice, slippery substance, hole, obstruction or defect in or upon any sidewalk, parking strip or curb open to the public in the city is declared to be a nuisance. It is unlawful hereafter for any owner, occupant or person, firm or corporation having charge of any premises or portion thereof abutting upon any portion of any sidewalk, parking strip and/or curb to allow such nuisance to remain in or upon such abutting portion of sidewalk, parking strip and/or curb for more than twenty-four hours continuously. It is the obligation and responsibility hereafter of any and all owners, occupants, and/or persons, firms or corporations having charge of any such abutting premises or portions thereof to keep all abutting portions of sidewalks, parking strips and curbs clear of such nuisances at all times. Any portion of sidewalks, parking strips and curbs lying between such premises and any public avenue, street or alley adjoining such premises shall for purposes of this chapter be included in the term “abutting portion.”