(10) US 2021/0025157 Al
(57) The precast structural element is made by a method including preparing one or more layers of plurality of horizontal and vertical reinforcement bars. The method further includes fixing a plurality of hollow tubes to the layers at predefined locations by holding means. Specifically, the hollow tubes are provided with openings at predefined locations. The hollow tubes are characterized by having any one of plurality of protrusions, plurality of corrugation, plurality of ribs, plurality of serrations and combination thereof ...
(71) PRECAST INDIA INFRASTRUCTURES PVT. LTD., Pune (IN)