wān huán ㄨㄢ ㄏㄨㄢˊ 弯环（弯环）
可更换弯环式扣件混凝土轨枕涉及铁路部件。
A concrete sleeper capable of changing bent loop type fastener relates to a railway part.
针对矿车用三环链，设计了一种新颖而简单易行的自动弯环机。
Thus, for the mine-used tri-ring chains, the novel and simple auto-bending ring machine have been designed.
铺轨时，“U”形弯环的环部被砸弯，压住钢轨的底脚，即可将轨枕与钢轨联结在一起。
During rail laying, the loop part of the U-shaped bent loop is knocked bent to hold down the foot of the rail and in this way, the sleeper and the rail are connected together.
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