A ladder is provided in a reinforcement lawn formed on a structure. According to an embodiment of the present invention, there is provided a ladder for installing a reinforced concrete, comprising: a pair of first vertical legs having an interior space; a pair of second vertical legs inserted into the pair of first vertical legs, And at least one joining member for joining the first vertical bar or the second vertical bar to the reinforcing rods protruding from the structure, Can be adjusted.
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