(b)where such payment is made after the 28th day of February, 1983, such programme involves work by way of construction of any building or other structure (whether for use as a dispensary, school, training or welfare centre, workshop or for any other purpose) or the laying of any road or the construction or boring of a well or tube-well or the installation of any plant or machinery, and such work has commenced before the 1st day of March, 1983.