| 摘要 |
A portable, demountable bridge to ford rivers and the like, includes a pair of footings for supporting the bridge buried at different heights in the soil on one side of the river. The footing closer to the river receives a load in a downward direction, and the footing further from the river resists an upward force produced by the weight of the bridge and objects on the bridge. Soil located over this further footing acts as a counterweight of the bridge. At least two bridge supporting units are located over the footing closer to the river. Preferably each supporting unit includes two support tubes. A removable first bracket is fixed to each supporting unit, and a second bracket is connected to the first bracket. The panels forming a roadway track for the bridge are connected to the second bracket via a first elongated support. A second elongated support connects to the footing further from the river to the second bracket. The supporting units are connected to the footing closer to the river through a pivot point which is made of two brackets connected together with a rod. A protective railing may be included on the roadway track of the bridge. The protective railing includes a plurality of U-shaped elements connected to the panel of the roadway track, and crossbars connect at least two of the U-shaped elements.
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