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农用枕梁桥是由埋设在土中的枕梁来支撑桥面维持平衡的一种结构型式。这种桥梁构造简单、容易施工、投资较少,已在许多灌排渠道上采用。但是在使用中不少桥梁出现枕梁脱落现象。黑龙江省青冈县中和涝区有70余座枕梁桥,经几年运用后,有10％枕梁脱落,影响工程正常利用。经调查分析,枕梁脱落的原因主要是由于水流测向侵蚀造成的。
Agricultural bolster bridge is a type of structure that is supported by a bolster embedded in the soil to maintain the balance of the deck. This bridge structure is simple, easy construction, less investment, has been adopted in many irrigation channels. However, there are many bridges in use bolster shedding phenomenon. In Qinglong County, Heilongjiang Province, there are more than 70 bolster bridges in the middle and waterlogged areas. After several years of use, 10% of the bolster fall off, affecting the normal utilization of the project. After investigation and analysis, the main reason for the shedding of the bolster is caused by the erosion of water flow direction.