| 摘要 |
A method of operation to effectively excavate an underdrain in the field ground having a long service life and ensuring that the underdrain will not be closed after a long period of time and a device for such operation. The method comprises attaching a plurality of buckets to an endless chain, driving said endless chain to excavate a slit in the field ground, reforming inner side walls of the slit by a reformer, pressing earth from both sides of the slit laterally inwardly by a pressing member attached to the reformer to form a block to separate said slit into an upper space and a lower space, and charging the upper space with discarded dirt.
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