To provide a levee body concrete excavating method, efficiently and economically penetrating and excavating levee body concrete and finishing an excavated wall surface, and making the excavated finished surface smooth even if dam concrete and aggregate have high strengths.
An outer peripheral continuous hole 15 is formed in the vicinity of the outer periphery of a hole planned position 11 of the levee body concrete 3, and isolation is performed for an excavated part. Subsequently, a horizontal continuous cut-hole 17a and a vertical continuous cut-hole 17b are formed in an excavated part surrounded with the outer peripheral continuous hole 15 to divide the excavated part into a plurality of blocks 25. The blocks 25 are crushed by a hydraulic breaker 27 to form a hole 19, and then the axial and circumferential projecting and recessed parts of the wall surface 24 of the hole 18 are sequentially removed by the hydraulic breaker 27 and a twin header.
COPYRIGHT: (C)2004,JPO&NCIPI
Ikuro Jinuchi
Fumiaki Kanaya
Yoshihisa Ishida
Toyo Construction Co., Ltd.
Nippon Rock Engineering Co., Ltd.
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