| 摘要 |
<p>An apparatus for breaking a hard surface such as a concrete road (38) or bridge deck and essentially consists of a support for a torsional spring (111) which is horizontally fixed to the support with a spaced rotational journal so that the torsional spring is mounted substantially horizontally. An oscillating member (115) of desired mass characteristics is rigidly attached to the torsional spring (111) with a force generating apparatus such as a hydraulic vibrator (117) on one end and a road crushing tool (44) on the opposite ends of the oscillating member. Apparatus is also provided for positioning the impact or road crushing tool against the surface to be crushed and for maintaining the tool in that position during the crushing operation. Operation of the hydraulic vibrator (117) causes axial oscillation in the torsional spring/mass system, which is then transferred to an axial oscillation of the impact tool (44), causing the tool violently to impact the surface to be crushed. The apparatus is preferably operated at the resonant frequency of the spring/mass system to obtain maximum amplitude and a corresponding increase in energy generated in the resonant mode.</p> |
