| 摘要 |
PROBLEM TO BE SOLVED: To crush only concrete sections without shredding the reinforcing bars of a welded structure of a structure embedded with the reinforcing bars of the welded structure. SOLUTION: This concrete crusher is provided with rotary drums 3, 3 which rotates reverse from each other in juxtaposition. The outer peripheries of these rotary drums 3 are projectingly provided with circular tooth trains 11 constituted by successively connecting 4 to 8 crushing teeth 10 of prescribed shapes in a circumferential direction. These circular tooth trains 11 forms V-shaped tooth grooves 12 between the adjacent crushing teeth and are alternately formed at a prescribed pitch along the axial direction of the rotary drums 3. The contours of the crushing teeth consist of arcuate bottom lands in contact with the outer peripheries of the rotary drums 3, arcuate tooth crests along the bottom lands, dedendum flanks of which the bottom ends intersect with both ends in the longitudinal direction of the bottom lands along the radial direction of the rotary drums 3 and oblique tooth surfaces forming the tooth grooves by intersecting with both ends in the longitudinal direction of the tooth crests from the top ends of the display flanks thereof. These oblique tooth surfaces intersect with both flanks of a lightweight concrete structure W of a cubic shape having a plate thickness of 150 mm as the raw material to be crushed respectively at a bite angle of 15 to 25 deg. at the ridge parts with the dedendum flanks.
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