Door descent preventing apparatus

A door descent preventing apparatus comprising:

• a plurality of support bars;
• an upper fixing unit configured to connect upper ends of the support bars to each other, the upper fixing unit including a first upper fixing piece having a semicircular arc shape and a second upper fixing piece having a semicircular arc shape;
• and
• a lower fixing unit configured to connect lower ends of the support bars to each other, the lower fixing unit including a first lower fixing piece having a semicircular arc shape and a second lower fixing piece having a semicircular arc shape,
• wherein
• the first upper fixing piece is provided with a first protrusion having a first through-hole,
• the second upper fixing piece is provided with a second protrusion having a second through-hole,
• wherein the first through-hole and the second through-hole are aligned when the first protrusion and the second protrusion overlap each other, and
• wherein the door descent preventing apparatus further comprises an upper locking loop positioned in the first through-hole and the second through-hole.