US3878987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway track structure
Assignee: Japan National Railways
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Filing: 1973-02-12
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Granted: 1975-04-22
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Expires: 1993-02-12
Abstract
Abstract An improved track structure which can hold the progress track irregularities under high-speed, high axle load and high-density train operation to a minimum, with the settling of conventional ballasted track structures due to the ballast being minimized. In the improved track structure, large panel sleepers or reinforced concrete including prestressed concrete or of steel are placed on the bottom ballast previously fully rolled to flatness with the gaps filled in with smaller crushed stones; the top-ballast is spread and rolled around the sleepers; rails are laid and fastened over the sleepers; the rail top is lifted to a specified height; a quick-hardening material is injected into the space between the base of the sleepers and the top surface of the bottom ballast to form an elastic hardened layer; a waterproof coat made of a quick-hardening waterproofing material is provided on the surface of the top ballast; and a gutter to drain the rainwater from the ballast is provided along the sides of ballast.
Inventors
- 👤 Hankichi Uzuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:56
CPC Classifications
E; E01; E01B; E01B1/00; E01B1/008; E01B3/00; E01B3/28; E01B3/38; E01B3/40; E01B1/001; E01B2204/00; E01B2204/03; E01B2204/07
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
72 words
A railway track structure comprising a bottom ballast having a relatively flat upper surface, at least one large panel sleeper disposed over said bottom ballast; top ballast disposed around said large panel sleeper; a quick-hardening material injected between the base of said large panel sleeper and the adjacent upper surface of said bottom ballast and a waerproof layer of a quick-hardening waterproofing material provided on the upper surface of said top ballast.
Claim 2
Dependent Claim
72 words
A railway track structure comprising a bottom ballast having a relatively flat upper surface, at least one large panel sleeper disposed over said bottom ballast; top ballast disposed around said large panel sleeper; a quick-hardening material injected between the base of said large panel sleeper and the adjacent upper surface of said bottom ballast and a waerproof layer of a quick-hardening waterproofing material provided on the upper surface of said top ballast.
Claim 3
Dependent Claim
72 words
A railway track structure comprising a bottom ballast having a relatively flat upper surface, at least one large panel sleeper disposed over said bottom ballast; top ballast disposed around said large panel sleeper; a quick-hardening material injected between the base of said large panel sleeper and the adjacent upper surface of said bottom ballast and a waerproof layer of a quick-hardening waterproofing material provided on the upper surface of said top ballast.
Claim 4
Dependent Claim
72 words
A railway track structure comprising a bottom ballast having a relatively flat upper surface, at least one large panel sleeper disposed over said bottom ballast; top ballast disposed around said large panel sleeper; a quick-hardening material injected between the base of said large panel sleeper and the adjacent upper surface of said bottom ballast and a waerproof layer of a quick-hardening waterproofing material provided on the upper surface of said top ballast.
Claim 5
Dependent Claim
30 words
A railway track structure of claim 1 wherein gutters with at least one through hole in the wall adjoining the ballast are provided along the longitudinal sides of the ballast.
Claim 6
Dependent Claim
17 words
A railway track structure of claim 1 wherein the waterproof layer is provided with a drainage gradient.
Claim 7
Dependent Claim
41 words
A railway track structure of claim 1 wherein crushed stones of a size smaller than that of the bottom ballast are disposed on the upper surface of the bottom ballast thereby controlling the depth of the injected material into the ballast.
Claim 8
Dependent Claim
24 words
A railway track structure of claim 1 wherein the injected, quick-hardening material is of a thermoplastic nature which fills adjacent voids in the ballast.
Claim 9
Dependent Claim
14 words
A railway track structure of claim 5 wherein the injected quick-hardening material is asphalt.
Claim 10
Dependent Claim
16 words
A railway track structure of claim 5 wherein the injected quick-hardening material is a synthetic resin.
Claim 11
Dependent Claim
22 words
A railway track structure of claim 5 wherein the injected quick - hardening material is a mixture of asphalt and synthetic resin.
Claim 12
Dependent Claim
26 words
A railway track structure of claim 1, wherein the ballast around the large panel sleeper is consolidated with the injected material, thereby increasing the ballast resistance.
Claim 13
Dependent Claim
15 words
A railway track structure of claim 1 wherein said large panel sleeper is reinforced concrete.
Claim 14
Dependent Claim
13 words
The railway track structure of claim 1 wherein said large panel is Steel.
Claim 15
Independent Claim
89 words
A method for making a railway track structure comprising rolling bottom ballast to substantial flatness placing at least one large panel sleeper on said bottom ballast; spreading and rolling top ballast around said large panel sleeper; lifting said large panel sleeper; injecting a quick-hardening injection material into the space created between the base of said large panel sleeper and the surface of said bottom ballast beneath said large panel sleeper and coating with a waterproof layer of a quick-hardening waterproofing material the exposed top surface of said top ballast
Claim 16
Independent Claim
89 words
A method for making a railway track structure comprising rolling bottom ballast to substantial flatness placing at least one large panel sleeper on said bottom ballast; spreading and rolling top ballast around said large panel sleeper; lifting said large panel sleeper; injecting a quick-hardening injection material into the space created between the base of said large panel sleeper and the surface of said bottom ballast beneath said large panel sleeper and coating with a waterproof layer of a quick-hardening waterproofing material the exposed top surface of said top ballast
Claim 17
Dependent Claim
28 words
A method of claim 12 wherein gutters with at least one through hole in the wall adjoining the ballast are provided along the longitudinal sides of the ballast.
Claim 18
Dependent Claim
24 words
A method of claim 12 wherein the waterproof layer formed on the top surface of said top ballast is provided with a drainage gradient.
Claim 19
Dependent Claim
46 words
A method of claim 12 wherein crushed stones of a size smaller than that of said bottom ballast are spread on the rolled surface of said bottom ballast prior to placing said large panel sleeper thereby controlling the injected depth of the material into the ballast.
Claim 20
Dependent Claim
44 words
A method of claim 12 wherein said quick-hardening injection material is of a thermoplastic nature and is injected in a hot molten state and allowed to cool and harden whereby an extensive solid mass is formed with the voids in the ballast filled up.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |