Bollard for floor installation

A bollard for floor installation, comprising:

• a base that is installed on the ground;
• an intermediate outer cylinder that is installed on a top of the base, has a compressive separating portion formed over an internal space thereof, and has a locking supporting plate at a lower portion thereof and a spring locking hook at an end of the locking supporting plate;
• a connector that is fitted in the base through the internal space of the intermediate outer cylinder;
• a spring that is fitted on the connector;
• and
• an extension outer cylinder that extends a length by being coupled to the intermediate outer cylinder,
• wherein the base comprises:
• a grounding fixing portion that can be installed and fixed on the ground by a fixing member;
• and an upright fixing portion that protrudes upward from a top of the ground fixing portion and has an insertion fastening groove, and the connector comprises:
• an insertion fastening portion that is formed at a lower portion thereof to be fitted in an insertion fastening portion of the base;
• and a main body that is integrally formed on a top of the insertion fastening portion,
• wherein the main body is formed in an “8” shape by combining an upper ellipsoidal solid and a lower ellipsoidal solid, which are different in outer diameter, with a coupling groove therebetween.