| 摘要 |
<p>The present invention provides a pile head processing method that has high work efficiency and can suitably demolish and remove excess concrete from a pile head. An in-situ cast piling (1) is constructed by erecting a rebar cage (25), in which a CD tube (31) is installed near a main reinforcement (7) in a spiral manner, into a hole (2) and then filling with concrete. Then a charging hole (9) is drilled horizontally from a side face to the interior at a boundary face (5) between the excess concrete (3) of the pile head exposed above the surface and the structural concrete (27) under the same, and the hole is charged with a non-explosive demolition agent (15). Moreover, at the excess concrete (3), the CD tube (31) is charged with a linear explosive as a demolition agent (36), and a charging hole (37) is drilled in a portion more to the interior than the main reinforcement (7) and is charged with a linear explosive as a demolition agent (38). After wrapping the periphery of the excess concrete (3) with a sheet (40) and a wire (41), the non-explosive demolition agent (15) and the demolition agents (36, 38) are demolished in order. After the excess concrete (3) is vertically separated from the structural concrete (27) at the boundary face (5), the separated excess concrete (3) is fragmented.</p> |
