That the common council of any city and the board of trustees of any village in this state are hereby authorized to construct, enlarge and maintain sewers, hereby declared to be public improvements, in private property; and may enter, by committee and by agents and servants, into and upon private property where it is proposed to construct a sewer, and make necessary examinations and surveys, the better to enable them to determine the necessity for using such private property for a sewer and to locate the same, and for any such entry no action shall be maintainable. But the common council or board of trustees before constructing a sewer in private property shall acquire the right to take and use the property for such purpose, by agreement or purchase, or by proceedings in the proper court in behalf of the municipality, in the manner provided by law in that behalf. All laws in conflict with the provisions of this act are hereby repealed.