Apparatus for forming in-ground concrete pilings

Apparatus for forming an in-ground concrete piling comprising:

• (a) an elongate, drivable, hollow mandrel having an upper end and a lower end, said mandrel having grout-transmitting apertures located proximate said lower end;
• (b) means defining a downwardly-facing surface adjacent the lower end of said mandrel for forming a hole which is larger in cross section than the cross section of said mandrel when said mandrel is driven into the ground;
• (c) means defining an upwardly-facing reaming surface adjacent the lower end of said mandrel for forming a hole which is larger in cross section than the cross section of said mandrel when said mandrel is withdrawn from the ground;
• and
• (d) means for selectively opening and closing said grout-transmitting apertures so as to open said apertures in response to the driving of said mandrel into the ground and close said apertures in response to the withdrawal of said mandrel from the ground.

An apparatus for forming an in-ground concrete piling comprising:

• (a) an elongate, drivable, hollow mandrel having an upper end and a lower end, said mandrel having grout transmitting openings located proximate said lower end;
• (b) foot means at said lower end of said mandrel for forming a hole which is larger in cross section than the cross section of said mandrel when said mandrel is driven into the ground;
• (c) a collar having a central opening longitudinally slidably receiving said mandrel;
• (d) means for introducing fluid grout into said hollow mandrel;
• (e) sealing means on said collar for preventing the flow of grout from said mandrel outwardly through said grout transmitting openings when said collar and foot means are proximate to each other, and permitting said flow when said collar and foot means are remote from each other;
• (f) said sealing means including selectively operable force-applying means for selectively pressing said collar downwardly toward said lower end of said mandrel.