of a mold segment 3 contact as seen in fig2 then the conveying bridge 34 is moved in the direction of production 6 until the two mold segment halves 4 5 that already form a mold segment 3 bear against the mold segment halves 4 5 that lead in the direction of production 6 and are seized and moved on by the driving pinions 8 and 16 then the clamping devices 57 are released and the conveying arms 53 are again moved outwards away from the molding path 2 the conveying bridge 34 is then again displaced as far as to the downstream end 69 as described above if it is desired to form a socket 73 in the continuous pipe 71 the main conveying device 29 is moved into the position shown by a dash dot line according to fig3 in which it is able to take up the socket mold segment halves 74 75 from their parking positions 76 77 as shown by the drawing these parking positions 76 77 are disposed between the guide rails 31 u2032 32 u2032 of the auxiliary conveying device 29 u2032 the longitudinal movement of the main conveying device 29 towards the end 69 of the apparatus is stopped by way of the proximity switches 65 taking up the socket mold segment halves 74 75 is performed in the same manner as described above with respect to the mold segment halves 4 5 afterwards the socket mold segment halves 74 75 are.