Railroad track bed using injection materials and method therefor
AssigneesJapanese National Railways, Nippon Oil Co., Ltd.
InventorsYasuo Katoh, Hideo Kakegawa, Shigeyuki Hayashi, Tadakazu Yamashita
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Abstract
In a railroad track bed, an injection layer is formed between the railroad ties and the raodbed so as to protect the latter. The injected layer is composed of an injection material injected through openings formed in the tie. The injection material has a viscosity below 30 poise at a temperature not higher than 200.degree. C. before hardening, and when hardened it has a compressive stress at 10% strain of 0.4 to 30 kg/cm.sup.2 at a compressive strain rate at 40.degree. C. of 1.5% per minute.
Claims7
A method of providing a protective layer between railroad ties and a railroad track bed, which comprises the steps of:
- (a) injecting through openings suitably provided in the ties of said bed an injection material selected from thermoplastic injection materials and reaction-hardenable injection materials and having a viscosity below 30 poise at a temperature not higher than 200.degree. C. before hardening and having after hardening a compressive stress at 10% strain of 0.4-30 Kg/cm.sup.2 at a compression strain rate at 40.degree. C. of 1.5% per minute, said injecting being effected at a temperature below 200.degree. C.;
- (b) allowing said injection material to extend through and to fill substantially completely said openings in said ties;
- and
- (c) allowing said injection material to solidify into a single layer between said bed and the lower surface of said ties.
A railroad track structure comprising a ballast roadbed having a relatively flat surface;
- a plurality of substantially rectangular ties arranged on said roadbed and supporting I-shaped rails;
- apertures within and through said ties for injecting an injection material;
- means on said ties to rigidly attach said rails thereto;
- and a layer of said injection material between said tie and said ballast roadbed, said injection material having a viscosity below 30 poise at a temperature not higher than 200.degree. C. before hardening and having after hardening a compressive stress at 10% strain of 0.4-30 Kg/cm.sup.2 at a compressive strain rate at 40.degree. C. of 1.5% per minute said injection material being selected from thermoplastic injection materials and reaction-hardenable injection materials.
Dependencies are inferred from the claim text.