| 摘要 |
The bridge for a trench or ditch spanning is hand assembled and consists of two pairs of track supports, laid in parallel with tie rods (4) connecting them laterally. The : support (1) is formed into a ramp (2) at one end and at the other end hasa a hinged ramp (3). The hinged ramp comprises hinged flaps pivotted on a hinge pin and on the surface there is a folding running section, which rests on a projection from the surface of the ramp, when in the raised position.
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