GB2273728A - Railway sleeper - Google Patents
Railway sleeper Download PDFInfo
- Publication number
- GB2273728A GB2273728A GB9326058A GB9326058A GB2273728A GB 2273728 A GB2273728 A GB 2273728A GB 9326058 A GB9326058 A GB 9326058A GB 9326058 A GB9326058 A GB 9326058A GB 2273728 A GB2273728 A GB 2273728A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sleeper
- sheet metal
- under surface
- baseplates
- strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
- E01B3/16—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from steel
- E01B3/20—Sleeper construction for special purposes, e.g. with openings for ballast working
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Description
2273728 RAILWAY SLEEPER This invention relates to railway sleepers When
track is laid in tunnels, it is conventional to lay sleepers across the tunnel so that the ends of the sleepers bear on the tunnel wall, and to locate a pad at the end of each sleeper in order to distribute stress applied by the sleeper on the tunnel wall. We have found, however, that the stress exerted on the wall can still lead to damage of the wall.
According to the present invention, there is provided a railway sleeper having an under surface that is curved in order to enable the sleeper to be positioned in a tunnel so that a major part of the under surface is in contact with the tunnel wall.
Preferably the sleeper is designed so that at least 75% of the under surface, and especially substantially the entire under surface, is capable of bearing on the tunnel wall in use. This has the advantage that the stresses applied by the sleeper on the tunnel wall are substantially reduced with respect to existing designs, with consequential reduction or even elimination of damage to the tunnel wall by the sleeper.
The sleeper may conveniently be formed from sheet metal. In such a case the central part of the sleeper,spanning the rails in use is preferably formed from a single strip of sheet metal that is curved to lie flat 2. on the tunnel wall. This construction has the advantage that it has a very low profile in the central part of the sleeper and exhibits little or no obstruction for example to personnel walking along the track. The sleepers can have a relatively low weight and can easily be transported. installed and removed.
Normally a baseplate for a rail of the track will be provided in the region of each of the sleeper, the baseplate preferably also being formed from sheet metal. It is possible for the baseplates to be formed from the same sheet metal as that of the remainder of the sleeper. for example by folding back the ends of the sleeper preform to form a pair of flat surfaces, but in the preferred design, the baseplate is formed from sheet metal that is thicker than that forming the remainder of the sleeper. For example the baseplates may be formed from steel having a thickness of from 12 to 15mm while the remainder may be formed from steel having a thickness in the range of 8 to 12mm.
One form of sleeper in accordance with the present invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a side elevation of the sleeper; and Figure 2 is a top plan view of the bleeper.
Referring to the accompanying drawings a sleeper 1 according to the present invention comprises a base 2 that spans the distance between the rails (one such rail 3. 3 being shown in phantom), and a pair of baseplates 4 and 5 that are located at either end of the base 2. The base 2 is curved to form a segment of a circle of radius 1.22m which corresponds to the internal radius of the tunnel in which the sleeper will be used. Each baseplate 4 and 5 is generally in the shape of an upturned U having one side arm 6 that is longer than the other side arm 61 so that the central part 7 thereof that forms a base for the rails between two locating ribs 8 and 9 will be horizontal.
A supporting rib 10 is formed in the steel sheet forming the base 2 of the sleeper beneath the central part 7 of each baseplate 4 and 5 so that is apex abuts the under surface of the central part and is directly below the centre of the rail placed on the baseplate. By this means the load on the rail is transferred to the base 2 via the arms 6 and 7 of the baseplates and the supporting rib 10, and is transferred to the tunnel floor over substantially the entire under surface of the sleeper base 2.
4.
Claims (1)
- CLAIMS 1. A railway sleeper having an under surface that is curved inorder to enable the sleeper to be positioned in a tunnel so that a major part of the under surface is in contact with the tunnel wall. 2. A sleeper as claimed in claim 1, wherein substantially the entire under surface is capable of bearing on the tunnel wall in use. 3. A sleeper as claimed in claim 1 or claim 2, which is formed from sheet metal. 4. A sleeper as claimed in claim 3 which has a central part that is formed from a single strip of sheet metal that is curved to lie flat on the tunnel wall. 5. A sleeper as claimed in claim 4 which includes a baseplate in the region of each end thereof for supporting rails, the baseplates being formed from sheet metal. 6. A sleeper as claimed in claim 5, wherein the baseplates have been formed by folding back each end of the strip of sheet metal to form a pair of flat surfaces. 7. A sleeper as claimed in claim 5, wherein the baseplates are formed from separate pieces of sheet metal that are thicker than the sheet metal forming the central part of the sleeper.5.8. A sleeper as claimed in any one of claims 5 to 7, which includes a pair of supporting ribs formed in the strip of sheet metal, each supporting rib abutting the under surface of an associated baseplate.9. A sleeper as claimed in claim 8, wherein each rib is formed as a fold in the strip of sheet metal.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB929226651A GB9226651D0 (en) | 1992-12-22 | 1992-12-22 | Railway sleeper |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9326058D0 GB9326058D0 (en) | 1994-02-23 |
GB2273728A true GB2273728A (en) | 1994-06-29 |
GB2273728B GB2273728B (en) | 1995-12-06 |
Family
ID=10726977
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB929226651A Pending GB9226651D0 (en) | 1992-12-22 | 1992-12-22 | Railway sleeper |
GB9326058A Expired - Fee Related GB2273728B (en) | 1992-12-22 | 1993-12-21 | Railway sleepers |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB929226651A Pending GB9226651D0 (en) | 1992-12-22 | 1992-12-22 | Railway sleeper |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0604202A2 (en) |
GB (2) | GB9226651D0 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB629872A (en) * | 1942-02-14 | 1949-09-29 | Eugene Freyssinet | Railway sleepers and other articles made of pre-stressed reinforced concrete, and a method of and apparatus for manufacturing such parts |
GB2063972A (en) * | 1979-11-27 | 1981-06-10 | Omark Industries Inc | Steel railroad sleeper |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE598188C (en) * | 1934-06-07 | Kurt Wiesinger | Rolling forced run for rail vehicles |
-
1992
- 1992-12-22 GB GB929226651A patent/GB9226651D0/en active Pending
-
1993
- 1993-12-21 GB GB9326058A patent/GB2273728B/en not_active Expired - Fee Related
- 1993-12-21 EP EP93310399A patent/EP0604202A2/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB629872A (en) * | 1942-02-14 | 1949-09-29 | Eugene Freyssinet | Railway sleepers and other articles made of pre-stressed reinforced concrete, and a method of and apparatus for manufacturing such parts |
GB2063972A (en) * | 1979-11-27 | 1981-06-10 | Omark Industries Inc | Steel railroad sleeper |
Also Published As
Publication number | Publication date |
---|---|
EP0604202A3 (en) | 1994-08-31 |
GB2273728B (en) | 1995-12-06 |
GB9326058D0 (en) | 1994-02-23 |
EP0604202A2 (en) | 1994-06-29 |
GB9226651D0 (en) | 1993-02-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20001221 |