Methods for providing piled foundations for constructions, piled foundations and a balloon for porviding an enlarged footing

Abstract

The present invention relates to methods for providing piled foundations for constructions, piled foundations, and a balloon for providing an enlarged footing.

1 . A method for providing a piled foundation for constructions, where said piled foundation is provided in-situ by the following steps: 
 i) a hole for a foundation pipe is drilled with a first worm auger, and a foundation pipe is positioned in said hole,    ii) a further section below the lower end part of the positioned foundation pipe is drilled,    iii) a cavity is provided in said section by means of a scraper and water pressure,    iv) the loose material from said cavity is removed with said first worm auger,    v) a tool implement pipe is lowered down through said foundation pipe into the lower part of said section, and said tool implement pipe comprises a second worm auger and a resilient balloon surrounding a lower part of said second worm auger,    vi) said balloon is pressurised and a casting material is injected into the walls of said cavity, upon which any displaced material is removed with said second worm auger,    vii) after said casting material has hardened, said balloon is deflated and removed through said foundation pipe,    viii) a reinforcement unit is lowered down through said foundation pipe,    iv) a concrete material is poured down through said foundation pipe, and said cavity is filled and said reinforcement unit is embedded in said concrete providing an enlarged footing for said foundation pipe.    
     
     
         2 . A method for providing a piled foundation for constructions, where said piled foundation is provided in-situ by the following steps: 
 i) a hole for a foundation pipe is drilled with a first worm auger, and a foundation pipe is positioned in said hole,    ii) a further section below the lower end part of the positioned foundation pipe is drilled,    iii) a cavity is provided in said section by means of a scraper and water pressure,    iv) the loose material from said cavity is removed with said first worm auger,    v) a tool implement pipe is lowered down through said foundation pipe into the lower part of said section and said tool implement pipe comprises a second worm auger and a resilient balloon surrounding a lower part of said second worm auger,    vi) said balloon is pressurised and a casting material is injected into the walls of said cavity, upon which any displaced material is removed with said second worm auger,    vii) after said casting material has hardened, said balloon is deflated and removed through said foundation pipe,    viii) a number of holes are formed into an upper part of said cavity, where each of said holes are adapted to receive a further foundation pile with a number of reinforcement units protruding into said cavity,    ix) a reinforcement unit is lowered down through said foundation pipe,    x) a concrete material is poured down through said foundation pipes, and said cavity is filled and said reinforcement units are embedded in said concrete providing an enlarged footing for said foundation pipes.    
     
     
         3 . A piled foundation provided by the method according to  claim 1 , characterised in that said enlarged footing comprises an outer layer of a casting material and a core of concrete wherein a reinforcement unit is embedded, and where said reinforcement unit is connected via a number of connecting means to said construction.  
     
     
         4 . A piled foundation provided by the method according to  claim 2 , characterised in that said enlarged footing comprises an outer layer of a casting material and a core of concrete wherein a number of reinforcement units are embedded, and where each of said reinforcement units is connected with said construction by connecting means extending through either said first or said further foundation pipes.  
     
     
         5 . A balloon for providing said enlarged footing of said foundations according to claims  1 - 2 , characterised in that said balloon on an outer surface is provided with a number of injection channels.