A construction prop comprising: • an outer pipe with a longitudinal central axis, the outer pipe being provided with: ∘ a foot at a lower end of the outer pipe; ∘ screw thread adjacent an upper end of the outer pipe; ∘ two slotted holes which are located at the screw thread and which extend in a direction parallel to the longitudinal central axis and which are provided diametrically relative to each other in the outer pipe; • an inner pipe which is slideably received in the outer pipe and which is provided with: ∘ a series of pairs of holes arranged over a part of the length of the inner pipe, wherein the two holes of each pair of holes are disposed diametrically relative to each other in the inner pipe; characterized in that the outer pipe comprises a foot reinforcement adjacent a lower end of the outer pipe, having a plurality of creases which each extend in tangential direction around the entire circumference of the outer pipe, wherein each crease extends in an imaginary plane (P1, P2,... Pn) which extends perpendicularly to the longitudinal central axis, wherein the tangential creases are provided in an area of the outer pipe which extends from adjacent the lower end of the outer pipe over a length of 10 - 50 cm, and wherein the tangential creases are provided through plastic deformation of the pipe wall and have a wave-shaped cross-sectional profile viewed in a cross-sectional plane in which also the longitudinal central axis extends. • an outer pipe with a longitudinal central axis, the outer pipe being provided with: ∘ a foot at a lower end of the outer pipe; ∘ screw thread adjacent an upper end of the outer pipe; ∘ two slotted holes which are located at the screw thread and which extend in a direction parallel to the longitudinal central axis and which are provided diametrically relative to each other in the outer pipe; ∘ a foot at a lower end of the outer pipe; ∘ screw thread adjacent an upper end of the outer pipe; ∘ two slotted holes which are located at the screw thread and which extend in a direction parallel to the longitudinal central axis and which are provided diametrically relative to each other in the outer pipe; • an inner pipe which is slideably received in the outer pipe and which is provided with: ∘ a series of pairs of holes arranged over a part of the length of the inner pipe, wherein the two holes of each pair of holes are disposed diametrically relative to each other in the inner pipe; characterized in that the outer pipe comprises a foot reinforcement adjacent a lower end of the outer pipe, having a plurality of creases which each extend in tangential direction around the entire circumference of the outer pipe, wherein each crease extends in an imaginary plane (P1, P2,... Pn) which extends perpendicularly to the longitudinal central axis, wherein the tangential creases are provided in an area of the outer pipe which extends from adjacent the lower end of the outer pipe over a length of 10 - 50 cm, and wherein the tangential creases are provided through plastic deformation of the pipe wall and have a wave-shaped cross-sectional profile viewed in a cross-sectional plane in which also the longitudinal central axis extends. ∘ a series of pairs of holes arranged over a part of the length of the inner pipe, wherein the two holes of each pair of holes are disposed diametrically relative to each other in the inner pipe;