Method for bracing a concrete element lifting loop, and support piece for a concrete element lifting loop

Abstract

A method for bracing a lifting loop for a concrete element at least during a concrete element lifting operation effected by using the lifting loop, whereby the lifting loop is at least partially located inside a recess prepared on a surface of the concrete element, in which method at least forces, which are longitudinal relative to a concrete element to be lifted and which are applied to the lifting loop, are conveyed to the concrete element to be lifted by means of a support piece to be set at least partially in said concrete element's recess prepared in association with the lifting loop. The invention relates also to such a lifting loop support piece.

1 . A method for bracing a lifting loop of a slipform-cast concrete element at least during a concrete element lifting operation effected by using the lifting loop, whereby the lifting loop is formed from a metal bar and is at least partially located inside a recess prepared on a surface of the concrete element, in which method at least forces, which are longitudinal relative to a concrete element to be lifted and which are applied to the lifting loop, are conveyed to the concrete element to be lifted by means of a support piece to be set at least partially in said concrete element's recess formed in association with the lifting loop. 
     
     
         2 . A method according to  claim 1 , in which method also forces, which deviate from a longitudinal direction of the concrete element and which are applied to the lifting loop, are conveyed via the support piece to the concrete element to be lifted. 
     
     
         3 . A method according to  claim 1 , in which method said support piece is a separate element, which is placed, prior to a concrete element lifting operation, in association with said recess of the concrete element and the lifting loop located in the recess, and which support piece is removed from the concrete element after the lifting operation. 
     
     
         4 . A method according to  claim 1 , in which method said support piece is fitted in association with a lifting hook to be secured in the lifting loop. 
     
     
         5 . A method according to  claim 1 , in which method the support piece is clamped in position by placing a lifting hook in the lifting loop braced by the support piece. 
     
     
         6 . A method according to  claim 1 , wherein the slipform-cast concrete element is a massive or hollow core slab. 
     
     
         7 . A support piece for a lifting loop formed from a metal bar and located in a slipfom-cast concrete element, said support piece comprising a section setting against a wall of a recess prepared in association with a concrete element lifting loop, and a section connecting the section setting against said recess' wall and an outer surface of the lifting loop for conveying from the lifting loop to the concrete element at least forces, which are applied to the lifting loop in a concrete element lifting operation and which are longitudinal relative to the concrete element. 
     
     
         8 . A support piece according to  claim 7 , said support piece comprising, at an upper edge of said section setting against the wall of said recess, a section setting against a top surface of the concrete product. 
     
     
         9 . A support piece according to  claim 7 , said support piece having been fitted in association with a lifting hook to be used in a lifting operation of the concrete element. 
     
     
         10 . A support piece according to  claim 7 , wherein the section, which connects the section setting against a wall of the concrete element's recess and an outer surface of the lifting loop, has the length of its cross-section matching substantially the diameter of the concrete element's recess, this connecting section having an opening, the width of which opening matches substantially the width of the lifting loop.