Method for improving the structural stability of an existing building construction

Abstract

The present invention relates to a method for improving considerably the structural stability of a building construction of already existing reinforced concrete (for example building constructions, schools, hospitals, bridges, etc.).

1 . A method for improving the structural stability of an existing building construction of reinforced concrete having one or more pillars and one or more beams comprising the following steps:
 a) performing a first horizontal drilling according to a cross direction to said pillar so as to involve the beam insisting on said respective pillar;   b) inserting a first reinforcement in said first drilling;   c) casting cementitious filling material, in particular fluidized expanding mortar, inside said first drilling;   d) performing a second vertical drilling in substantially central position and along the longitudinal axis of said one or more pillars;   e) inserting a second reinforcement in said vertical drilling having a plurality of openings apt to make a cementitious filling material to flow from inside towards outside of said second reinforcement.   f) casting said cementitious filling material, in particular fluidized expanding mortar, inside said second reinforcement until the complete filling-up of said second drilling.   
     
     
         2 . The method according to  claim 1  wherein said second reinforcement comprises a metal pipe or a metal cage. 
     
     
         3 . The method according to  claim 1 , wherein said horizontal and vertical drillings are performed with continuous core boring at the centre of the section of said one or more pillars and said one or more beams. 
     
     
         4 . The method according to  claim 1 , wherein said second drilling is performed for the whole longitudinal size of said one or more pillars. 
     
     
         5 . The method according to  claim 1  wherein said second reinforcement is inserted for the whole longitudinal size of said first drilling. 
     
     
         6 . The method according to  claim 1  wherein said openings are distributed along the entire first reinforcement, preferably arranged staggered to each other. 
     
     
         7 . The method according to  claim 1 , wherein said first reinforcement comprises a threaded bar, an iron bar or a metal tube. 
     
     
         8 . The method according to  claim 1 , wherein said first reinforcement is inserted for the whole longitudinal size of said beam. 
     
     
         9 . The method according to  claim 1 , wherein a drawing of said beam to said pillar is performed by fastening means placed at the head of said beam. 
     
     
         10 . The method according to  claim 1  wherein said one or more pillars are an intermediate peripheral pillar and/or a corner peripheral pillar and/or an internal pillar. 
     
     
         11 . The method according to  claim 1  wherein in the step a) one or more horizontal drillings are performed, so as to involve said beams positioned at the structural nodes of said construction. 
     
     
         12 . A building construction of reinforced concrete having one or more pillars and one or more beams insisting on a respective pillar, wherein said one or more beams comprise a first horizontal reinforcement for the whole longitudinal axis of said beam and wherein said one or more pillars comprise in substantially central position and for the whole longitudinal axis of said pillar a second vertical reinforcement, and wherein said second vertical reinforcement has a plurality of openings apt to drain off a cementitious filling material, in particular expanding mortar, from the inside di said reinforcement to the outside of said reinforcement and wherein said second reinforcement is filled with said cementitious material. 
     
     
         13 . The building construction according to  claim 12  wherein said first reinforcement comprises pre-stressed strands or a threaded bar with a diameter of at least 20 mm. 
     
     
         14 . The building construction according to  claim 12  wherein said second reinforcement comprises a metal pipe or a metal cage. 
     
     
         15 . The building construction according to  claim 12  comprising fastening means. 
     
     
         16 . The building construction according to  claim 15  wherein said fastening means comprises a nut and a metal plate screwed so that said beam are drawn to the pillar. 
     
     
         17 . The building construction according to  claim 12  wherein said one or more pillars are an intermediate peripheral pillar and/or a corner peripheral pillar and/or an internal pillar. 
     
     
         18 . The building construction according to  claim 12  wherein said second vertical reinforcement is extended into the subsoil below the foundations of said pillar. 
     
     
         19 . The building construction according to  claim 12  wherein said second vertical reinforcement is extended into the subsoil below the foundations of said pillar. 
     
     
         20 . The building construction according to  claim 19  wherein said second vertical reinforcement is extended into the subsoil for at least 70 cm to the foot of the pillar and for at least 70 at the head of said pillar. 
     
     
         21 . The building construction according to  claim 12  wherein said beam inserted in said first vertical reinforcement is a flooring beam with bearing or connecting thickness. 
     
     
         22 . The building construction according to  claim 12  wherein said beam sustains the covering flooring or inter-floor. 
     
     
         23 . The building construction according to  claim 12  wherein said pillar comprises two, three or more vertical reinforcements.