| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reinforcement structure around a man through-hole in an underground beam such that a structure is simple without a high manufacturing cost, construction is facilitated, sufficient strength is obtained at any part around the man through-hole, and the strength is maintained over a long period of time without executing special treatment even after the construction. <P>SOLUTION: The following members are buried in concrete: hole periphery reinforcing bars including four sets of oblique reinforcing bars 8 arranged in an X shape forming a set by two on both sides of a man through-hole 5 formed in an underground beam 3, tightened to a beam main reinforcement by a hook at an end on the man through-hole side, fixed to concrete at the other end, and arranged facing each other at an interval in a beam width direction and hole periphery shear reinforcing bars 11 wound and arranged over upper and lower beam main reinforcement groups in an effective range of shear reinforcement on both sides of the man through-hole, and a pair of upper and lower hole part reinforcing bars including lower part stirrups 14 wound and arranged over a plurality of axial direction reinforcing bars 13 arranged in parallel with the beam main reinforcement at an upper part and a lower part of the man through-hole and hole upper and the beam main reinforcement on the outermost side. <P>COPYRIGHT: (C)2013,JPO&INPIT |
