| 摘要 |
The apparatus (100) comprises a mobile chassis (112), e.g. supported at either end by a suitable tractor (102, 104), an elongate support (114) carried on the chassis and long enough to span several sleepers, with a number of flexible tethers (126) depending from respective points spaced along the support and adapted to suspend a batch of sleepers simultaneously. An alignment template extends beneath the elongate support (114) and is formed so as to engage the suspended batch of sleepers simultaneously and fix their positions. A mechanism is provided whereby the alignment template and suspended sleepers are made moveable so as to permit an efficient sequence of lifting, aligning and depositing batches of sleepers, without the need for fine manual adjustment. In one embodiment, the alignment template comprises spaced projections (122) formed on the underside of the chassis (112), while the elongate support (114) is a lifting beam extending above the chassis. The apparatus can be adapted for laying fourteen or even twenty-eight sleepers in one batch. |
