PROBLEM TO BE SOLVED: To enable traction of a machine frame by a traveling machine body while the machine frame turns horizontally by a pivot mechanism even when a traveling direction is curved and changed since a movement mechanism for moving the machine frame in a lateral direction perpendicular to the traveling direction of the traveling machine body is provided, and also the pivot mechanism for connecting the machine frame in a horizontally turnable way with respect to the traveling machine body is provided, thereby enabling continuous trench digging operation without stopping the traveling machine body as well as lifting up or down trench-cutting bodies and a plow member in a stop state.SOLUTION: An attachment frame 3 is connected to a traveling machine body 1 by a connection mechanism 2. A body frame 4 is provided in the attachment frame, and a machine frame 5 is provided in the body frame. The machine frame is provided with trench-cutting bodies 9 and 10 capable of forming trenches on a field surface M, and a plow member 13 capable of scooping field soil at the rear position of the trench-cutting bodies in a traveling direction and discharging the soil to the side. A movement mechanism 8 for moving the machine frame in a lateral direction perpendicular to the traveling direction of the traveling machine body is provided between the attachment frame and the body frame. A pivot mechanism 6 for connecting the machine frame in a horizontally turnable way with respect to the traveling machine body is provided. A posture holding mechanism 33 capable of holding a non-load time posture in the traveling direction of the traveling machine is provided.COPYRIGHT: (C)2015,JPO&INPIT【課題】機枠を走行機体の進行方向に対して直交する左右方向に移動させる移動機構を設け、機枠を走行機体に対して水平旋回自在に連結する枢着機構を設けてなるから、進行方向を折曲変向しても、機枠は枢着機構により水平旋回しながら牽引され、従って、走行機体を停止したり、停止状態において、溝切体及びすき部材を上昇及び下降動作させたりすることなく、連続的に溝掘作業を行うことができる。【解決手段】走行機体1に連結機構2により取付枠3を連結し、取付枠に本体枠4を設け、本体枠に機枠5を設け、機枠に圃場面Mに溝切り可能な溝切体9・10を設け、溝切体の進行方向後方位置の圃場土を掬い取って側方に排出可能なすき部材1
