This part shall not be construed to conflict with chapter 2 of this title, providing for the construction of workhouses in any county or declaring any county jail a workhouse, but shall be construed as supplementary to that chapter, and this part shall apply to such counties as are not actually working all of their inmates confined in the county jail for nonpayment of fines and costs adjudged against them or that may hereafter not be actually working the inmates according to chapter 2 of this title.