Method for producing a screw foundation

Abstract

A method for producing a screw foundation ( 1 ) for anchoring building parts or structures in the ground, comprising the following steps: providing a tubular starting material ( 10 ) with a required length, laying a free end ( 12 ) of the tubular starting material ( 10 ) between at least two shaped elements ( 20 ), securing the tubular starting material ( 10 ) in its longitudinal direction, compressing the free end ( 12 ) of the tubular starting material ( 10 ) by moving together the at least two shaped elements ( 20 ), with the result that an at least partially tapering region ( 14 ) is formed on the free end ( 12 ) of the tubular starting material ( 10 ), and forming a screw-like or helical thread ( 16 ) on the at least partially tapering region ( 14 ).

1 . A method for producing a screw foundation ( 1 ) for anchoring building parts or structures in the ground, comprising the following steps:
 providing a tubular starting material ( 10 ) with a required length,   laying a free end ( 12 ) of the tubular starting material ( 10 ) between at least two shaped elements ( 20 ),   securing the tubular starting material ( 10 ) in its longitudinal direction,   compressing the free end ( 12 ) of the tubular starting material ( 10 ) by moving together at least two shaped elements ( 20 ), with the result that an at least partially tapering region ( 14 ) is formed on the free end ( 12 ) of the tubular starting material ( 10 ), and   forming a screw-like or helical thread ( 16 ) on the at least partially tapering region ( 14 ).   
     
     
         2 . The method according to  claim 1 , characterised in that when moved together the shaped elements ( 20 ) are acted upon evenly by a hydraulic press ( 22 ). 
     
     
         3 . The method according to  claim 1  or  2 , characterised in that at least three, preferably at least four shaped elements ( 20 ) are used to compress the free end ( 12 ) of the tubular starting material ( 10 ). 
     
     
         4 . The method according to any of the preceding claims, characterised in that the shaped elements ( 20 ) are configured and moved together such that the free end ( 12 ) of the tubular starting material ( 10 ) is moulded to form a blunt end ( 18 ). 
     
     
         5 . The method according to  claim 4 , characterised in that the free end ( 12 ) of the tubular starting material is moulded by the shaped elements ( 20 ) such that it has an axial through hole ( 12   a ). 
     
     
         6 . The method according to any of the preceding claims, characterised in that at least one shaped element ( 20 ) has at least one projection ( 24 ) on its surface facing towards the tubular starting material. 
     
     
         7 . The method according to any of the preceding claims, characterised in that the tubular starting material ( 10 ) has a rectangular or round cross-section. 
     
     
         8 . The method according to any of the preceding claims, characterised in that there is additionally formed on the tubular starting material ( 10 ) a connection section ( 30 ) which is provided on the side of the tubular starting material ( 10 ) lying opposite the at least partially tapering region ( 14 ). 
     
     
         9 . The method according to  claim 8 , characterised in that the connection section ( 30 ) is formed with a flange ( 30 ) extending around the tubular starting material and which has through holes and/or welded on threaded nuts. 
     
     
         10 . The method according to any of the preceding claims, characterised in that the tubular starting material ( 10 ) is made at least partially of stainless steel. 
     
     
         11 . The method for producing a screw foundation ( 10 ) for anchoring building parts or structures in the ground, comprising the steps:
 providing a tubular starting material ( 10 ) in one piece;   dividing the starting material ( 10 ) into at least two base elements ( 40 ) respectively along a spiked line ( 42 ), by means of which base elements ( 40 ) respectively having at least two toothed sections ( 44 ) are formed;   deforming the toothed sections ( 44 ) such that the latter form a tapering section ( 14 ) of the base element ( 40 );   connecting the toothed sections ( 44 ) to one another along at least one welded seam ( 46 ).   
     
     
         12 . The method according to  claim 10 , characterised in that at least one welded seam ( 46 ) is provided in the tapering section ( 14 ).