KR20120110457A - H type tie for railroad - Google Patents

H type tie for railroad Download PDF

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Publication number
KR20120110457A
KR20120110457A KR1020110028327A KR20110028327A KR20120110457A KR 20120110457 A KR20120110457 A KR 20120110457A KR 1020110028327 A KR1020110028327 A KR 1020110028327A KR 20110028327 A KR20110028327 A KR 20110028327A KR 20120110457 A KR20120110457 A KR 20120110457A
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KR
South Korea
Prior art keywords
rail
resistance
donor
sleeper
main pedestal
Prior art date
Application number
KR1020110028327A
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Korean (ko)
Inventor
김해곤
Original Assignee
김해곤
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Priority to KR1020110028327A priority Critical patent/KR20120110457A/en
Publication of KR20120110457A publication Critical patent/KR20120110457A/en

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B1/00Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
    • E01B1/001Track with ballast
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B1/00Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
    • E01B1/008Drainage of track
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B3/00Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
    • E01B3/28Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
    • E01B3/32Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone with armouring or reinforcement
    • E01B3/34Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone with armouring or reinforcement with pre-tensioned armouring or reinforcement
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2204/00Characteristics of the track and its foundations
    • E01B2204/07Drainage

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)

Abstract

The present invention relates to an H-type sleeper, and more specifically, a railroad sleeper made of prestressed concrete (PC) and RC (Reinforced concrete) or RC (Reinforced concrete), and a donor gal resistance band is installed at the center. The rail support part is installed horizontally to prevent track inaccuracies, improve the shape and structure to reinforce the track, and H type sleepers that significantly increased the safety of the train operation.
The present invention is a railway sleeper (T) is installed in the lower portion of the rail 100, the rail 100 is seated on the upper surface, two straight main pedestal 200 is spaced apart from each other in the width direction; A donor gal resistance band 300 connecting the central portion of the side of the main pedestal 200 to each other; It relates to an H-type sleeper comprising a.
In the present invention, the main pedestal is made of PC (prestressed concrete) and the box box resistance band may be made of RC (Reinforced concrete), or both the main stand and the box box resistance band to be made of RC (Reinforced concrete) The rail support part 200R, on which the rail is seated, may be formed in a plane such that no inclination is formed on the upper surface of the main pedestal 200.
In the present invention, the main pedestal 200 is connected to the upper inclined surface 210 inclined in the outward direction while both sides of the width direction in the downward direction from the upper side, the upper inclined surface 210 and the upper inclined surface 210 It may include a lower inclined surface 220 inclined outward while going downward with a larger slope than), and the main pedestal 200 and the donor gal resistance band 300 is interconnected to be formed in the vertical direction The reinforcement part 500 having a triangular horizontal cross section may be formed to protrude further along the vertical direction.
In the present invention, one end portion 511 of the exposed surface 510 exposed to the outside of the reinforcement portion 500 is rounded in a horizontal direction and connected to the main pedestal 200, the reinforcement portion 500 The other end 512 of the exposed surface 510 exposed to the outside is rounded in the horizontal direction and may be connected to the donor galvanic resistance band 300, which is engraved from the bottom surface of the donor galvanic resistance band 300. The recessed portion 330 may be formed, and the recessed portion 330 may be semi-circular in the tip portion and may be conical or parabolic in the circumferential surface from the tip portion to the open portion.
In the present invention, the distance from both sides of the width direction of the donor galvanic resistance 300 to the bottom of the rail 100 are each 15 cm or more, and the width of the donor galvanic resistance 300 is 15? It may be 90cm, the flow prevention projections 700 that can contact the main pedestal 200 of the rail sleepers (T) which are installed adjacent to each other on the width direction outer surface of the main pedestal 200 may be formed to protrude.
In addition, the present invention has been devised to solve the problems of the existing railway sleepers, railway H-type sleepers can improve the drainage of the track. In addition, in order to prevent track inaccuracies and to increase the lateral resistance and longitudinal resistance by more than 1.8 times, a donor claw connection is installed at the center of the sleeper, and a slope is placed on the side of the sleeper to prevent up and down flow of the sleeper. It is designed to reduce. In addition, by making the rail support flat, it is possible to reduce uneven wear and noise of the rail and to safely operate the train by reducing the lateral resistance of the wheel. Cone-shaped recesses are made on the bottom of the box, and the tip of the recess is made in a semi-circular shape to increase the longitudinal resistance and transverse resistance and prevent the damage of the sleeper due to the intaglio. The joints of the sleepers and the rails should be horizontally diagonally or perpendicular to the rails or the length of the rails to prevent the tracks from being inaccurate and twisted, thereby preventing the train from derailing and improving the ride comfort. In addition, the donor galvanic resistance of the track is to increase the lateral resistance and longitudinal resistance further, to provide a railroad sleeper to prevent railway accidents in advance by securing the safety of the track.

Description

H sleepers {H type tie for railroad}

The present invention relates to an H-type sleeper, and more specifically, a railroad sleeper made of prestressed concrete (PC) and RC (Reinforced concrete) or RC (Reinforced concrete), and a donor gal resistance band is installed at the center. The rail support part is installed horizontally to prevent track inaccuracies, improve the shape and structure to reinforce the track, and H type sleepers that significantly increased the safety of the train operation.

Railroad sleepers refer to sleepers made of wood or concrete, which are laid under the rails in order to fix the rails in a predetermined position on the track and to distribute the load of the trains received from the rails to the road.

In this case, the railroad sleepers are generally formed in a straight shape, and a plurality of railroad sleepers are disposed in the direction perpendicular to the rail.

Recently, however, various types of sleepers have been proposed that are effective and competitive in terms of stability, durability, and ease of installation and economical maintenance and future maintenance.

These conventional straight sleepers and multi-stage railroad sleepers have the following problems.

Conventional straight rail sleepers are vulnerable in terms of safety of the track, such as vulnerable to the lateral resistance and longitudinal resistance, causing the long run of the track threatening the safe operation of the train.

In the case of the conventional multi-stage railroad sleeper, firstly, due to the complexity of the shape, not only the production is difficult but also the manufacturing cost increases. Second, there is a problem in that the length of the sleeper has a limit in increasing the transverse resistance and the longitudinal resistance, and finally, the line is settled because it is not drained by the sleeper transverse supports on both sides of the central connection. The problem remains a lot of trouble.

In addition, the conventional sleepers for railroads have difficulty in maintenance due to the twisting of the track and frequent track twisting due to the straight shape, which is a major cause of deterioration of ride comfort, and the twisting phenomenon is caused by the three-point support of the train bogie. There is a problem of derailment.

Japanese Unexamined Utility Model Publication No. 50-148702 (published Dec. 10, 1975) The sleepers did not function well as sleepers due to poor drainage, which promoted the generation of bunnies and required twisting and frequent repairs. And it was proved that there was no economic feat of sleepers because it was difficult to work with multiple typ stamps, ballast cleaners, ballast compacts, etc., which were large repair equipments of the track. In this way, the sleepers should be designed to support the rails, to facilitate drainage, and to be able to work with large-scale maintenance equipment while increasing the longitudinal and lateral resistances to ensure safe operation of the train.

1. Korea Utility Model Registration No. 20-0264304. 2. Japanese Utility Model Model No. 50-148702. 3. Japanese Patent Application Laid-Open No. 09-273102 4. Korean Registered Patent

Accordingly, the present invention has been made to solve the above-described problems, to provide an H-type sleeper that can improve the drainage of the track.

In addition, the present invention can be installed in the center of the sleeper to prevent the inaccuracy of the track and to increase the lateral resistance and longitudinal resistance by more than 1.8 times, by placing the slope on the side of the sleeper to prevent the up and down flow of the sleeper It is intended to provide railroad sleepers that can reduce the accuracy of tracks.

In addition, the present invention by reducing the flat wear of the rail to reduce the noise by reducing the rail support portion of the upper surface of the sleeper is the rail seating area, and can reduce the lateral resistance of the wheel for the railroad that can safely drive the train To provide sleepers.

In addition, the present invention by engraving the bottom of the donor galvanic resistance to create a concave concave shape to make the tip of the main portion in a circular shape, H-type that can increase the image longitudinal resistance and the lateral resistance of the image and prevent the damage of the sleeper caused by the intaglio To provide sleepers.

In addition, the present invention is the height of the main pedestal and the height of the donor galvanic resistor, and the upper surface of the main pedestal and the upper surface of the donor galvanic resistor is located on the same horizontal plane, so as to prevent the incorrect and torsional (twist) of the track in advance train To prevent derailment and provide a good rail sleeper.

In addition, the present invention is designed so that the distance from the end of the width of the box to the rail to the rail 15cm or more, railroad sleeper that can be machined for large maintenance using multiple tie temp, ballast cleaner, ballast compact, ballast regulator, etc. To provide.

The present invention is a railway sleeper (T) is installed in the lower portion of the rail 100, the rail 100 is seated on the upper surface, two straight main pedestal 200 is spaced apart from each other in the width direction; A donor gal resistance band 300 connecting the central portion of the side of the main pedestal 200 to each other; It relates to an H-type sleeper comprising a.

In the present invention, the main pedestal is made of PC (prestressed concrete) and the box box resistance band may be made of RC (Reinforced concrete), or both the main stand and the box box resistance band to be made of RC (Reinforced concrete) The rail support part 200R, on which the rail is seated, may be formed in a plane such that no inclination is formed on the upper surface of the main pedestal 200.

In the present invention, the main pedestal 200 is connected to the upper inclined surface 210 inclined in the outward direction while both sides of the width direction in the downward direction from the upper side, the upper inclined surface 210 and the upper inclined surface 210 It may include a lower inclined surface 220 inclined outward while going downward with a larger slope than), and the main pedestal 200 and the donor gal resistance band 300 is interconnected to be formed in the vertical direction The reinforcement part 500 having a triangular horizontal cross section may be formed to protrude further along the vertical direction.

In the present invention, one end portion 511 of the exposed surface 510 exposed to the outside of the reinforcement portion 500 is rounded in a horizontal direction and connected to the main pedestal 200, the reinforcement portion 500 The other end 512 of the exposed surface 510 exposed to the outside is rounded in the horizontal direction and may be connected to the donor galvanic resistance band 300, which is engraved from the bottom surface of the donor galvanic resistance band 300. The recessed portion 330 may be formed, and the recessed portion 330 may be semi-circular in the tip portion and may be conical or parabolic in the circumferential surface from the tip portion to the open portion.

In the present invention, the distance from both sides of the width direction of the donor galvanic resistance 300 to the bottom of the rail 100 are each 15 cm or more, and the width of the donor galvanic resistance 300 is 15? It may be 90cm, the flow prevention projections 700 that can contact the main pedestal 200 of the rail sleepers (T) which are installed adjacent to each other on the width direction outer surface of the main pedestal 200 may be formed to protrude. have.

As described above, H-type sleepers according to the present invention has the following effects.

First, the present invention can be formed in the H-shape to provide an opening at the end of both sleepers under the rail to improve drainage to prevent the generation of bunnies on the track.

Second, the present invention significantly increases the longitudinal resistance and the lateral resistance of the sleeper in the H-shape, the axial force of the rail according to the transverse pressure and the temperature change of the rail, and the axial force and the running of the rail according to the stretching action of the rail. Strong and even resistance to the action of the axial force (force acting in the longitudinal direction of the rail) prevents the rail from derailing and overturning due to unloading, and has an excellent effect on the safe operation of the train and the track maintenance.

Third, the present invention is made of the H-shape, from the manufacturing process between the rail surface and the rail surface is made horizontally to reduce the inaccuracy of the track and to facilitate maintenance and eventually ride comfort is improved, three points support of the train bogie Eliminating the phenomenon has the advantage of preventing railway accidents by improving the safety of the track.

Fourth, the present invention is made of an H-shape, not only can replace the existing sleepers and PC sleepers, but also increase the axial force and lateral pressure of the rail rail by more than 1.8 times to increase the safety of the long rail, especially the safety of the track There is an advantage that can also contribute to the improvement.

Fifth, the present invention has the advantage of engraving the bottom of the donor galvanic resistance to make a concave recess, to make the tip of the recess in a circular shape to increase the image longitudinal resistance and the lateral resistance of the wound and prevent damage to the sleeper due to the intaglio have.

Sixth, the present invention has an advantage to prevent the vertical vibration of the track to increase the vertical longitudinal resistance and lateral resistance by increasing the slope from the bottom to the top of the sleeper to improve the riding comfort.

Seventh, since the present invention is H-type, the transverse displacement of the rail is reduced and the longitudinal rigidity of the rail is increased.

Figure 1 is an installation of the rail mounting example 1 according to the present invention.
Figure 2 is a vertical cross-sectional view of Figure 1;
Figure 3 is a perspective view of the main part of Figure 1;
4 is a plan view of Embodiment 1. FIG.
5 is a cross-sectional view taken along the line AA ′ of FIG. 4.
Fig. 6 is a sectional view taken along line BB 'in Fig. 4;
7 is a cross-sectional view taken along line CC ′ of FIG. 4.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Example 1

Example 1 relates to an H-type sleeper according to the present invention.

1 is a view showing the installation of a rail mounted example 1, Figure 2 is a vertical cross-sectional view of Figure 1, Figure 3 is a perspective view of Example 1, Figure 4 is a plan view of Example 1, Figure 5 is a view 4 is a sectional view taken along line AA ′, FIG. 6 is a sectional view taken along line BB ′ of FIG. 4, and FIG. 7 is a sectional view taken along line CC ′ of FIG. 4.

1 and 2, the railroad sleeper T of the first embodiment is installed at a lower portion of the rail 100. Railroad sleepers (T) are buried surrounded by donor gal (P) to expose the upper surface.

Referring to Figure 3 railway sleepers (T) is formed to form an H type. Railroad sleepers (T) includes two straight main pedestal 200 and the donor gal resistance band (300). The two straight main pedestals 200 are spaced apart from each other in the width direction. The railroad sleepers T form an H-shape by connecting the center portion of the two main pedestals 200 with each other. Since the present invention forms an H shape, the transverse displacement of the rail is reduced and the bending force along the longitudinal direction of the rail is reduced.

2 and 3, the rail 100 is seated and fixed on an upper surface of the main pedestal 200. In order to fix the rail 100, shoulders 400 are respectively installed on both sides of the rail support part 200R on which the rail 100 is seated, among the upper surfaces of the main pedestal 200.

Referring to FIG. 4, the rail support part 200R formed on the upper surface of the main pedestal 200 is formed in a plane. Therefore, since the rail 100 is seated and fixed to the flat rail support 200R having no inclination, track inaccuracy, noise and vibration are reduced, and uneven wear of the rail 100 is reduced, thereby increasing the life of the rail 100. .

Referring to Figure 3, the railroad sleepers (T), since the two main pedestal 200 is connected by the donor galvanic resistance 300, an opening is formed between both ends of the two main pedestal 200 is good drainage Is done. Therefore, it is possible to prevent the occurrence of Bunny in the track, reducing the track wrong.

3 and 4, the reinforcement part 500 having a triangular horizontal cross section is further along the vertical direction at a corner portion where the main pedestal 200 and the donor gal resistance band 300 are connected to each other and formed in the vertical direction. Is formed to protrude.

Referring to FIG. 4, the reinforcement part 500 includes an exposed surface 510 exposed to the outside. On the other hand, one end 511 of the exposed surface 510 is rounded in the horizontal direction and connected to the main pedestal 200, the other end 512 of the exposed surface 510 is rounded in the horizontal direction and It is connected to the gravel resistance band (300). As both ends 511 and 512 of the exposed surface 510 are rounded, the railroad sleepers T and the donor gal P closely adhere to each other, and both ends 511 and 512 of the exposed surface 510 are smoothly adhered to each other. Its rigidity against breakage is enhanced.

On the other hand, the main pedestal 200 is made of PC (prestressed concrete), the donor gal resistance band 300 can be made of RC (reinforced concrete) or all of the RC or PC. The reason why the donor galvanic resistance 300 is made of RC (reinforced concrete) is to reduce the loss of the PC steel wire, avoid the complexity of the production, and reduce the cost.

PC (prestressed concrete) is a structure for increasing the force to withstand the external force received in use by pre-stressing the member using a piano wire or special steel wire. In general, concrete is subjected to tensile strain, and cracks often occur. If such compressive force is applied to a member such as a piano wire in advance, the tensile strain is canceled by compressive deformation force such as a piano wire. As a result, the member itself is not subjected to substantially large tensile strain.

RC (reinforced concrete) is a structure that stores the weakness of tensile stress of concrete with rebar. In other words, the compressive force of the concrete and the tensile force of the reinforcing bar are integrated with respect to the external force, so that the defects can be complemented with each other. RC (reinforced concrete) structure is made of wooden boards or iron plates in the form of beams, walls, columns, etc. If you wait until the mold is demolded, a RC (reinforced concrete) member is created.

Referring to FIG. 6, four longitudinal reinforcing bars 310 are disposed in the donor galling resistor 300 to form a rectangular lattice shape along the longitudinal direction of the donor galling resistor 300. In addition, when looking at the cross-sectional cross-section of the donor gal resistance band 300, the widthwise reinforcing bar 320 is disposed to surround the four longitudinal reinforcing bars 310 arranged in the longitudinal direction. Width reinforcing bars 320 are spaced apart from each other and are arranged in plurality. Referring to FIG. 5, eight widthwise reinforcing bars 320 may be disposed, including those arranged on the main pedestal 200.

5 and 7, a plurality of 16 steel wires 230 are disposed along the longitudinal direction of the main pedestal 200 in the main pedestal 200. As described above, concrete may be poured in a state in which tensile force is applied to the plurality of 16 steel wires 230.

Referring to FIG. 7, upper inclined surfaces 210 and lower inclined surfaces 220 are formed on both side surfaces of the main pedestal 200 in the width direction. The upper inclined surface 210 is formed to be inclined outward while going downward from the top of the main pedestal 200. The lower inclined surface 220 is connected to the lower end of the upper inclined surface 210 and is inclined in an outward direction while going downward with a larger inclination than the upper inclined surface 210. The reason why the inclination angle of the lower inclined surface 220 is increased in the inclined surface of the upper inclined surface 210 is that the donor gal (P) presses the main pedestal 200, thereby preventing the up and down flow of the track, thereby reducing the inaccuracy of the track and the riding comfort. Is to make it good.

Referring to FIG. 4, the width W of the donor galvanizing rod 300 is 15? It is formed to be 90cm. This is for the distance (d) from the both sides of the width direction of the donor gal resistance band 300 to the rail support portion 200R formed on the upper surface of the main pedestal 200 is 15 cm or more. That is, since the distance R between the rails 100 is 143.5 cm as a standard, since the narrow gauge has a wide gauge, the width W of the donor gal resistance band 300 is 15? It should be less than 90cm so that the distance (d) from the both sides in the width direction of the donor gal resistance band 300 to the rail support portion (200R) formed on the upper surface of the main pedestal 200 are each 15cm or more. By designing the width W of the donor gal resistance band 300 to 15 to 90 cm, it is possible to operate a large-scale maintenance machine using multiple tie temps, ballast cleaners, ballast compacts, ballast regulators, and the like. On the other hand, the main pedestal 200 has a length (L) of 100cm? It may be formed to be 450cm.

Referring to FIG. 6, a recess 330 having a predetermined cross-sectional shape is formed in the donor gal resistance band 300. The recess 330 is engraved in the upward direction from the bottom surface in the donor gal resistance band 300. The recess 330 may be a semicircular shape of the tip portion located at the upper end thereof, and a circumferential surface from the tip portion to the opening portion located at the bottom portion thereof may be conical or parabolic. The tip portion of the recess 330 is manufactured in a semicircular shape to increase the lateral resistance and the longitudinal resistance of the statue, and to prevent the damage of the donor gal resistance band 300. On the other hand, since the recess 330 is formed in the donor gal resistance band 300, the frictional force between the 1 donor gal resistance band 300 and the donor gal (P) is increased.

Example 2

Example 2 relates to another railway H-type sleepers according to the present invention.

FIG. 8 is a plan view of Embodiment 2, and FIG. 9 is an installation view of Embodiment 2. FIG.

8 and 9, the second embodiment includes two main pedestals 200 and a donor galvanic resistor 300 as in the first embodiment.

8 and 9, one of the two main pedestals 200 protrudes from the flow preventing protrusion 700. The flow preventing protrusion 700 protrudes in the longitudinal direction of the rail 100 on the outer side in the width direction of the main pedestal 200, and is formed to be positioned on the longitudinal extension line of the donor rib 300. When the railroad sleeper T is installed, the flow preventing protrusion 700 is connected to or connected to the main pedestal 200 of the railroad sleeper T installed adjacent to each other.

The flow preventing protrusion 700 is in contact with or connected to the main pedestal 200 of the railroad sleeper T, which is installed next to each other, thereby increasing the force that obstructs the movement of the railroad sleeper T as a whole. In addition, the movement along the longitudinal direction of the rail 100 is relatively much smaller and the movement due to the vehicle load is smaller, thereby ensuring safe driving of the vehicle and reducing track trajectory of the track. have. A shock absorbing material 710 may be attached to the front end of the flow preventing protrusion 700.

Other matters are the same as those described in Example 1.

20a, 20b: main base forming part
21: steel wire holding unit 21a: steel wire groove
22: bottom 23: plate
24: Bolt 25: Nut
27: interval maintenance
Fig. 30: Winner gal resistance band forming portion 31: Moving plate
32: fixed pin
50: Guide part
100: rail
200: Main stand 200R: Rail support part
210: upper inclined surface 220: lower inclined surface
300: Warrior Gal Resistance 330:
500: reinforcement part 510: exposure surface
511: one end of the exposed surface 512: the other end of the exposed surface
700: flow prevention protrusion

Claims (3)

In the railroad sleeper T installed in the lower portion of the rail 100,
Two rail-shaped main pedestal 200, the rail 100 is seated on an upper surface thereof and spaced apart from each other in the width direction;
A donor gal resistance band 300 connecting the central portion of the side of the main pedestal 200 to each other;
Including but, the width (W) of the donor galvanic resistance 300 is limited to 15 ~ 90cm or less and the distance (d) from both sides in the width direction of the donor galvanic resistance 300 to the rail bottom (200R) 15 cm or more, respectively H-type railway sleepers, characterized in that as possible.
The method of claim 1,
H-type railway sleepers, characterized in that formed on both sides of the connecting base having a rail bottom width or less on the lower rail between the main support and the main support.
The method of claim 2,
H-type railway sleepers, characterized in that the lower connection between the main support and the main support base to form a lower than the rail base width lower than the main support for drainage.
KR1020110028327A 2011-03-29 2011-03-29 H type tie for railroad KR20120110457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110028327A KR20120110457A (en) 2011-03-29 2011-03-29 H type tie for railroad

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Application Number Priority Date Filing Date Title
KR1020110028327A KR20120110457A (en) 2011-03-29 2011-03-29 H type tie for railroad

Publications (1)

Publication Number Publication Date
KR20120110457A true KR20120110457A (en) 2012-10-10

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