Patent ID: 8117787

Claim:
A length-adjustable construction support, comprising: a first pipe; a second pipe having an outer diameter smaller than an inner diameter of the first pipe; an inner stopper coupled to an outer circumference of the second pipe at a set position, the inner stopper includes a plurality of pressure ridges formed on an inner circumference thereof to press and fix the outer circumference of the second pipe, a separation guide flange protruding outward from an outer circumference thereof by a set length, at least one cutout slot formed in a lengthwise direction thereof, and at least one ring retaining groove formed in at least one of upper and lower ends thereof, and the at least one ring retaining groove is fitted with a snap ring; and an outer stopper having a support wall formed on an inner circumference thereof such that the inner stopper is inserted and supported, and a stop step formed at a lower end of the support wall to be supported on the first pipe.