Construction method of a tower foundation

Abstract

The invention provides an in-situ concreting construction method of tower foundations ( 10 ), particularly wind turbine tower foundations, configured by a base slab ( 11 ) with a circular or a polygonal shape, a pedestal ( 13 ) with a cylindrical or a prismatic shape and a plurality of radial walls ( 15 ) with a prismatic-triangular or a prismatic-trapezoidal shape extending from the pedestal ( 13 ) towards the outer edge of the base slab ( 11 ). The construction method comprises a curing step in which water is supplied to the foundation in an automatically controlled mode from a plurality of water emitters ( 59 ) arranged in water distribution pipes ( 55, 57 ) placed over predetermined locations of the foundation ( 10 ).

1 . Construction method of the foundation ( 10 ) of a tower;
 comprising the following steps: a) Preparation of the site including the construction of a pavement ( 25 ) of plain cement concrete; b) Placing the anchor cage ( 21 ) and the reinforcement; c) Formwork; d) Concreting; e) Formwork stripping; f) Curing;   wherein:
 Step b) is carried out in the following sub-steps: b1) Placing leveling legs ( 37 ) with base plates ( 39 ) fixed to the pavement ( 25 ) as positioning means for the anchor cage ( 21 ); b2) placing the reinforcement ( 41 ) of the base slab ( 11 ); b3) placing in position the anchor cage ( 21 ) with the leveling legs ( 37 ) fastened to the lower flange ( 33 ); b4) placing the reinforcement ( 43 ,  45 ) of the pedestal ( 13 ) and the radial walls ( 15 ); 
 Steps c), d), and e) are carried out sequentially for the whole foundation ( 10 ); 
 Step f) is carried out supplying water in an automatically controlled mode to the foundation ( 10 ) from a plurality of water emitters ( 59 ) arranged in water distribution pipes ( 55 ,  57 ) placed over predetermined locations of the foundation ( 10 ). 
   
     
     
         2 . Construction method according to  claim 1 , wherein the automatically controlled mode of supplying water to the foundation ( 10 ) comprise controlling at least the supply times along a predetermined period of time. 
     
     
         3 . Construction method according to  claim 1 , wherein said water distribution pipes ( 55 ,  57 ) are located, respectively, over the radial walls ( 15 ) and the base slab ( 11 ). 
     
     
         4 . Construction method according to  claim 1 , wherein the base slab ( 11 ) is configured with a circular or a polygonal shape. 
     
     
         5 . Construction method according to  claim 4 , wherein the base slab ( 11 ) is configured with a uniform thickness or a decreasing thickness between the pedestal ( 13 ) and the outer edge. 
     
     
         6 . Construction method according to  claim 1 , wherein the pedestal ( 13 ) is configured with a cylindrical or a prismatic shape. 
     
     
         7 . Construction method according to  claim 1 , wherein the radial walls ( 15 ) are configured with a prismatic-triangular or a prismatic-trapezoidal shape. 
     
     
         8 . Construction method according to  claim 7 , wherein the radial walls ( 15 ) are configured with a prismatic-triangular shape having a uniform thickness along its length or a decreasing thickness in the direction towards the outer edge. 
     
     
         9 . Construction method according to  claim 7 , wherein the radial walls ( 15 ) are configured with a prismatic-trapezoidal shape leaving a void space ( 48 ) between them and both the pedestal ( 13 ) and the base slab ( 11 ). 
     
     
         10 . Construction method according to  claim 1 , wherein the tower belongs to a wind turbine. 
     
     
         11 . Tower foundation ( 10 ) wherein is being configured by a base slab ( 11 ), a pedestal ( 13 ) and a plurality of radial walls ( 15 ) extending from the pedestal ( 13 ) towards the outer edge of the base slab ( 11 );
 the pedestal ( 13 ) including an anchor cage ( 21 ) as attachment means of the tower to the foundation ( 10 ) which is formed by upper flange ( 33 ) and a set of bolts ( 35 ) and cooperating nuts for fastening them to the lower flange ( 33 ).