Precast concrete reinforcing block assembly for seismic strengthening and method for constructing same

Abstract

The present invention relates to a precast concrete reinforcing block assembly for seismic strengthening and a method for constructing the same that are capable of allowing internal reinforcing bars to be inserted into hollow holes of a plurality of precast concrete reinforcing block units stacked outside or inside an existing structural member and filling the hollow holes with filling materials, thereby providing excellent constructability, having no additional fire protection coating, and allowing reinforcement of internal force against an axial force of the member.

1 . A precast concrete reinforcing block assembly for seismic strengthening, which is adapted to reinforce an existing member ( 1   a ,  1   b , or  1   c ), the precast concrete reinforcing block assembly comprising:
 a plurality of precast concrete reinforcing block units ( 2 ) each having a cuboidal body ( 2   a ), an upper extension portion ( 2   b ) protruding from the upper portion of the body ( 2   a ) in one direction, and a lower extension portion ( 2   c ) protruding from the lower portion of the body ( 2   a ) in the other direction, so that the plurality of precast concrete reinforcing block units ( 2 ) are interlockingly stacked on top of each other in every direction by means of hollow holes ( 20 ) formed therein to pass therethrough in longitudinal directions thereof;   internal reinforcing bars ( 3 ) adapted to pass through the hollow holes ( 20 ) of the plurality of precast concrete reinforcing block units ( 2 ) stacked up and down on top of each other; and   filling materials ( 4 ) filled in the hollow holes ( 20 ) of the plurality of precast concrete reinforcing block units ( 2 ).   
     
     
         2 . The precast concrete reinforcing block assembly according to  claim 1 , wherein the precast concrete reinforcing block unit ( 2 ) has first receiving grooves ( 23 ) formed on at least one or more outer surfaces thereof in the longitudinal direction thereof, so that first external reinforcing bars ( 6 ) are received in the first receiving grooves ( 23 ) in such a way as to be located over the plurality of precast concrete reinforcing block units ( 2 ) stacked on top of each other in the longitudinal directions of the plurality of precast concrete reinforcing block units ( 2 ), and the filling materials ( 4 ) are filled in the first receiving grooves ( 23 ). 
     
     
         3 . The precast concrete reinforcing block assembly according to  claim 1 , wherein the precast concrete reinforcing block unit ( 2 ) has second receiving grooves ( 24 ) formed on at least one or more surfaces of the front and rear surfaces thereof in a transverse direction thereof, so that second external reinforcing bars ( 7 ) are received in the second receiving grooves ( 24 ) in such a way as to be located over the plurality of precast concrete reinforcing block units ( 2 ) adjacent to one another in the transverse directions of the plurality of precast concrete reinforcing block units ( 2 ), and the filling materials ( 4 ) are filled in the second receiving grooves ( 24 ). 
     
     
         4 . The precast concrete reinforcing block assembly according to  claim 1 , wherein the hollow holes ( 20 ) pass through the body ( 2   a ), the upper extension portion ( 2   b ), and the lower extension portion ( 2   c ), respectively, in vertical directions. 
     
     
         5 . A method for constructing the precast concrete reinforcing block assembly for seismic strengthening according to  claim 1 , the method comprising the steps of:
 (a) stacking the plurality of precast concrete reinforcing block units ( 2 ) on the outer surfaces of the existing member ( 1   a ,  1   b , or  1   c );   (b) insertedly building the internal reinforcing bars ( 3 ) into the hollow holes ( 20 ) formed on the plurality of precast concrete reinforcing block units ( 2 ) stacked up and down on top of each other; and   (c) filling the hollow holes ( 20 ) with the filling materials ( 4 ).