An installation apparatus for constructing a prestressed concrete beam work path is provided to install the work path quickly, and to cut down expenses by simply mounting a safety net in a lower part of the work path with simple structure. An installation apparatus(100) includes an installation body(103) welded into a clamp(102) regulating a scaffold pipe, and a retaining arm(105) inclined downward for a prestressed concrete beam and formed in an upper part of the installation body. The retaining arm is contacted perpendicularly to an inclined surface of the prestressed concrete beam, and a contact unit(108) is formed at an end(107) of the retaining arm to prevent a slip by increasing the contact force with the inclined surface. A rotation restricting unit is formed to prevent the scaffold pipe from rotating around the installation body, and an upper part of the installation body is connected to a horizontal bar. Vertical bars are fixed at both ends of the horizontal bar, and the retaining arm is fastened to the top of the vertical bar.
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