All claims of any contractor or others, which may, under the provisions of this chapter, be due to such contractor or other persons for labor done or materials furnished in and about the construction, reconstruction or improvement of a road or bridge under the jurisdiction of the county court, shall be presented to the county court at the proper session thereof, and if found correct, shall, upon the order or warrant of such court, signed by the president and clerk thereof, be paid by the sheriff. No claim shall be paid by the county court until a thorough investigation of its validity has been made.