外文翻译--摊铺机的熨平板（适用于毕业论文外文翻译+中英文对照）.doc

Paver screed 1.1 Function Fulfilled by the Screed The screed, the road paver‘s working tool, fulfils the function of uniformly compacting the paving material across the entire pave width and producing a close-textured and level surface. The screed‘s compacting systems shall pre-compact the mix to the greatest possible extent. This is to minimize the influence of layer thickness upon the amount of subsequent compaction by rolling when bringing about the pavement’s final density. For pre-compaction, different compacting systems are available: T = Tamper (an eccentric shaft causes the tamper bar to move up and down) V = Vibrators (vibrations are generated by an eccentric shaft acting on the screed plates at right angles to the direction of motion) P = Pressure Bar(s) (the pressure bar(s) are hydraulically pressed onto the mix at a frequency of 68 Hz (approx.) and a maximum pressure of 130 bar) P1 = Screed equipped with 1 Pressure Bar P2 = Screed equipped with 2 Pressure Bar 1.2 Extending Screeds and Bolt-on Extensions For all VOGELE screeds, bolt-on extensions are available. The VOGELE system of bolt-on extensions allows to easily and sturdily build up screeds to any pave width desired. Even when paving in large widths, VOGELE screeds work with highest precision and achieve superb degrees of uniform density right up to the pavement edges. When fitting bolt-on extensions, care must be taken to ensure that the bottom edge of the screed plate is flush with the adjacent units, otherwise a step may be produced in the pavement or the screed planning angle may change. During the paving process, this can have a negative effect on pre-compaction, surface structure and floating behaviour of the screed. 1.3 Set-Up of the Extending Screed 1. Position both extending units in place so that the screed plate of the basic unit and the screed plates of the extending units are roughly level. 2. Slacken the chains connecting the spindles on the extending unit so that each spindle can be a