An apparatus is provided for making drainage elements in a vertical
manner. In one embodiment, a vertically disposed hollow rotatable mandrel
with a screw-threaded flight is used for guiding a length of perforated
pipe and filling an annular space between the pipe and a cylinder of mesh
material secured at one end to the pipe with aggregate. A hopper is used
for directing the aggregate into the space between the mandrel and a
cylindrical outlet of the hopper. A motor for driving the mandrel may be
reversed at a slower speed than the forward speed to stop delivery of
aggregate and to allow time for the upper end of the cylinder of mesh
material to be severed and secured to the pipe to form a drainage element
as well as to allow severance of the pipe. In another embodiment, the
perforated pipe is driven through the hopper and the aggregate flows
under gravity into the mesh sleeve.