Problem to be solved: to prevent the occurrence of abnormal noise and to consider the environmental aspects such as reclamation and material regeneration, the assembly and welding work of the core member, the upper and lower members, and the welding work can be carried out easily and easily. Provide a steel top plate so that sufficient strength can be obtained.Core material 3A3b,Forward and backward downward edges 12 of top memberArranged along 13An edge reinforcing member 3a of a cross section hat shape having a length reaching the left and right downward edges 13 of the upper surface member 1 andA plurality of edges are provided in parallel with the edge reinforcement 3A between the edge reinforcing membersIt is composed of an intermediate reinforcing member 3B having a cross section hat shape having a length reaching the left and right downward edges 13 of the upper surface member 1On the upper and lower members 1 and 2The edge stiffener 3a and intermediate stiffener 3b areBy welding eachThey are integrated into boxes.Diagram
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