To improve workability by providing a pair of crushing teeth plates that rotate reversely to each other and a block scattering-prevention plate in the bucket of a civil engineering machine.

In a bucket 1 attached to the manipulating arm 3 of a civil engineering machine, a pair of rotating shafts 4, 5 are so supported that they can rotate adversely each other via teeth wheels, a hydraulic motor, and the like. For example, a plural sheets of crushing teeth plates 12, 13 with crushing teeth such as angular teeth 16 and acute angle thrusting teeth 17 provided radially projectingly at some places are secured to the shafts 4, 5. Then, the shafts 4, 5 are rotated inwardly each other to thereby concrete blocks (k) are broken by the teeth plate 12, 13 and crushed matters are ejected from the falling port 19 at the bottom of the bucket 1. In addition, a jumping up prevention plate 20 for concrete blocks (k) being crushed is pivoted at the upper part of the bucket to be freely opened and closed by an operation arm 3 and connection rod 22. In this way, disposal blocks scooped up by the bucket can be disposed safe as it is.