| 摘要 |
Improved rail clip support shoulders are less expensive than conventional shoulders. The rail seat includes a concrete rail tie; a pair of rail clip support shoulders cast in place in said rail tie each said shoulder having a rail face between its external sides; a pair of shoulder insulators each shaped to lie against the rail face of the rail shoulder; a pair of rail clips each having a base section adapted to seat within the rail clip support shoulder and a toe section adapted to seat on the rail base, the toe section comprising a pair of bifurcated arms extending from said base section and being bent in a curve so that the toes lie adjacent but beyond the base; the arrangement being such that the clamping force exerted by each installed clip is at least 8 kilonewtons and the leading edge of the base section of the rail clip first engages a loading incline on either side of the rail clip ramp, while the line of contact of the trailing edge of base section is on the concrete rail tie and the trailing edge does not contact the rail clip ramp in the support shoulder until at least 40% of the distance to fully install the clamp has been traveled.
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