of the fresh concrete to the grout 11 accordingly this arrangement is sufficient to facilitate the withdrawal of the tension member it is also possible to prevent the bonding action between the concrete and the tension member in other ways for facilitating the removal of the tension member another embodiment of the invention is illustrated in fig4 and 5 in this embodiment a tension member 21 including a number of individual tension elements 23 extends through a sheathing member 24 to the right hand or first end surface of the concrete component 22 the tension elements 23 extend through the concrete component 22 within a duct 25 formed by an outer sheathing tube 26 and an inner sheathing tube 26 39 at the left hand end or second end surface of the concrete component 22 the tension elements 23 are secured in a cylindrical block 27 by anchoring nuts 29 and the cylindrical block bears against an anchoring body 28 encased within the concrete component duct 25 formed by the sheathing tubes 26 26 39 has a radially widened portion 30 extending inwardly from the first end surface widened portion 30 includes a transition support surface 30 39 extending radially inwardly from the outside diameter of the widened portion to the diameter of the sheathing tubes 26 26 39 additional tension elements 31 are secured at one end in anchoring bodies 32 and the tension elements 31 are located radially outwardly from the tension elements 23 adjacent the anchoring bodies 32 the tension members 31 extend parallel to the tension elements 23 and pass through the transition support surface 30.