Jack base of construction scaffolding

Abstract

The invention is a jack base 10 of construction scaffolding which includes a base plate 20 that is fixed to the ground surface 1 and has a hole 21 formed through the center thereof; a screw shaft 30 whose lower end is engaged in the hinges 22,31 on opposite side of the periphery of the hole 21 on the base plate 20 and whose upper end is connected to the lower end of the vertical pipe 4; a support member 40 that is screwed to the screw shaft 30 and supports the vertical pipe 4 of the scaffolding 3; and a fixing bar 50 that penetrates the hole 21 in a swingable manner and is fixed by being embedded in a ground surface 1.

1 . A jack base ( 10 ) of construction scaffolding used to fix a vertical pipe ( 4 ) of a scaffolding ( 3 ) to a ground surface ( 1 ), which includes a base plate ( 20 ) that is fixed to the ground surface ( 1 ) and has a hole ( 21 ) formed through the center thereof in an upper and lower direction; a screw shaft ( 30 ) whose lower end is engaged in the hinges ( 22 , 31 ) on opposite side of the periphery of the hole ( 21 ) on the base plate ( 20 ) and whose upper end is connected to the lower end of the vertical pipe ( 4 ); a support member ( 40 ) that is screwed to the screw shaft ( 30 ) and supports the vertical pipe ( 4 ) of the scaffolding ( 3 ); and a fixing bar ( 50 ) that penetrates the hole ( 21 ) in a swingable manner and is fixed by being embedded in a ground surface ( 1 ). 
     
     
         2 . A jack of construction scaffolding of  claim 1 , wherein a tapered portion ( 51 ) whose diameter becomes narrower toward the bottom is formed at the lower end of the fixing bar ( 50 ), and a plurality of discharge grooves ( 52 ) extending vertically and spaced apart along the circumferential direction are formed in the tapered portion ( 51 ) so that soil or concrete powder of a ground surface ( 1 ) is discharged as the fixing bar ( 50 ) is driven into the ground surface ( 1 ).