SAFETY NET FOR CASING

PURPOSE: To provide a safety net for casing capable of completely preventing a worker from falling down in a longitudinal hole during the work for placing concrete, simplify the loading of the safety net, provide no hindrance to concrete casting work, make it possible to apply to the casing with a different outside diameter and to simply handle it since it is lightweight. CONSTITUTION: In a casing safety net provided between a casing C buried into the ground and a tremie pipe T inserted into the same casing C, it is equipped with a rope-like upper ring 2 with the roughly same outside diameter as the inside diameter of the casing C, a lower ring 3 with a diameter smaller than the rope-like upper ring 2 placed to a lower position of the rope-like upper ring 2 and a cone-shaped net 4 bearing the upper end and lower end on the rope-like upper ring 2 and lower ring 3 respectively. A plurality of interlocking hooks 5 to the upper end of the casing C are provided on the rope-like upper ring 2, and a hook 6 with rope is provided to the lower ring 3.