发明授权
US4720043A Resilient ballast underlayment mat including nonwoven fiber fleece layers 失效
弹性压载垫,包括非织造纤维羊毛层

Resilient ballast underlayment mat including nonwoven fiber fleece layers
摘要:
A road bed for railway rails comprises a ballast underlayment mat in the form of a body of elastomeric material. The mat has, at its bottom, prominent projecting parts of the elastomeric material and is covered by stone ballast. At least one fiber fleece layer on the top of the mat limits penetration of the stone ballast into the elastomeric material.
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