JP2006299740A - Vibration damping fastener and rail track - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress a shock applied to a ballast way, to improve a ride quality of a train, and to reduce a noise, in a vibration damping fastener for fastening a rail to a crosstie. <P>SOLUTION: A vibration absorbing pad 8 comprising a highly damping rubber 81 and a second class rail track pad 82 glued to the damping rubber 81 is interposed between a synthetic crosstie 2 and a rail 3. The damping rubber 81 abuts on a wall part 72 of a pad case 7 so that the expansion in a direction perpendicular to the direction of vibrations of the rail 3 may be suppressed. Accordingly, railway vibrations generated by travelling of the train are sufficiently absorbed and damped by compression of the damping rubber 81 of the vibration absorbing pad 8 in a direction of the thickness (the direction of vibrations of the rail 3). Since the damping rubber 81 expands in a horizontal direction (the direction perpendicular to the direction of the vibrations of the rail 3) when it is compressed in the direction of the thickness by receiving the railway vibrations, it is pressed back by the wall part 72 of the pad case 7. Consequently, the vibration absorbing pad 8 is restored to its original state soon after its compression. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration damping fastening device for fastening a rail to a sleeper.

Conventionally, in this type of track, a second type track pad made of synthetic rubber such as SBR is inserted between the sleeper and the rail to absorb and attenuate the railroad vibration generated by the vehicle running. (For example, refer nonpatent literature 1).
Fastening Device Research Group, “Fastening Device Handbook”, published by Japan Railway Facility Association (revised 1984), pages 23-24

  However, with the conventional second-type track pad, a sufficient damping effect cannot always be desired.

  Therefore, it is conceivable to substitute a low-repulsion member (high damping rubber or the like) having a high damping effect. However, railway vibrations are affected by repeated loads at a certain frequency over a certain period of time, and the frequency is high. Therefore, if low repulsion members are used, the repeated loads cannot be accommodated by displacement. That is, the track pad using the low repulsion member is not restored to the original position at the time of receiving the second load after being deformed by receiving the first load. It cannot be mitigated. As a result, not only does the impact on the roadbed through sleepers increase, the ride comfort of the train worsens, and there is also the inconvenience that loud noise is generated.

  An object of this invention is to provide the vibration damping fastening apparatus and track | orbit which can eliminate such inconvenience.

First, the invention of a vibration damping fastening device according to claim 1 is a vibration damping fastening device for fastening a rail to a sleeper, wherein a vibration absorbing pad including a low repulsion member is inserted between the sleeper and the rail. The low-rebound member is characterized in that expansion in a direction perpendicular to the vibration direction of the rail is suppressed.
The invention of a vibration damping fastening device according to claim 2 is characterized in that the low repulsion member is housed in a pad case, and a side surface of the low repulsion member is in contact with a wall portion of the pad case. To do.
The invention of a vibration damping fastening device according to claim 3 is characterized in that the low repulsion member is a high damping rubber.
The vibration damping fastening device according to a fourth aspect of the invention is characterized in that the vibration absorbing pad is formed by attaching a second-type track pad to high damping rubber.
The invention of the track according to claim 5 is characterized in that the rail is fastened to the sleeper by the vibration damping fastening device according to any one of claims 1 to 4.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing the impact given to a roadbed through a sleeper, the riding comfort of a train can be improved, and also noise can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the track 1, as shown in FIG. 1, a large number of synthetic sleepers 2 are horizontally mounted on a pair of steel girders (not shown) made of H-section steel. On the upper side of these synthetic sleepers 2, a pair of rails 3 are placed in parallel with each other so as to extend in a direction perpendicular to the plane of FIG. In FIG. 1, only one rail 3 is shown.

  Here, as shown in FIG. 1, each synthetic sleeper 2 and each rail 3 are fastened by a vibration damping fastening device 5, which includes a tie plate 6, a pad case 7, and a vibration absorbing pad. 8, square root bolt 9, clip 4, clip packing 14, bamboo shoot spring 12, hexagon nut 13, rail screw 15 and the like.

  That is, a cast iron tie plate 6 is placed on the synthetic sleeper 2 as shown in FIG. As shown in FIG. 2, the tie plate 6 has a rectangular flat plate-like substrate 61, and a rectangular pad fitting hole 62 is formed through the central portion of the substrate 61. Further, two bolt locking holes 63 are formed through the substrate 61 so as to be positioned on both the left and right sides of the pad fitting hole 62. Further, two clip engaging grooves 64 are formed in the substrate 61 in a form positioned outside the bolt locking holes 63, that is, on the opposite side to the pad fitting holes 62. In addition, circular nail holes 65 are formed in the vicinity of the four corners of the substrate 61 so as to penetrate each of the corners.

  Further, as shown in FIG. 1, a pad case 7 made of synthetic resin is installed in the pad fitting hole 62 of the tie plate 6 so as to contact the upper surface of the synthetic sleeper 2. As shown in FIG. 3, the pad case 7 has a rectangular flat plate-shaped bottom portion 71 having an inner surface inclined by 1/40, and a wall portion 72 is provided around the bottom portion 71.

  Further, as shown in FIG. 1, a rectangular flat plate-shaped vibration absorbing pad 8 is inserted into the pad case 7. As shown in FIG. 4, the vibration absorbing pad 8 has a high damping rubber 81 such as polynorbornene rubber, and a second type orbit pad 82 is stuck on the high damping rubber 81. Here, the side surface of the high damping rubber 81 is in contact with the wall portion 72 of the pad case 7 as shown in FIG. As shown in FIG. 1, the second type track pad 82 is in contact with the lower surface of the rail 3, and the upper surface of the second type track pad 82, that is, the surface in contact with the rail 3, has a spring constant. Several grooves (not shown) are formed for the purpose of adjustment.

  Further, as shown in FIG. 1, square root bolts 9 are locked in the respective bolt locking holes 63 of the tie plate 6. As shown in FIG. 5A, the square root bolt 9 has a dish-shaped head 91, and a square portion 92 for preventing rotation is integrally provided at the base of the head 91. Yes. A shaft portion 93 is integrally connected to the square portion 92, and a male screw portion 94 is formed at the tip of the shaft portion 93. And since the square part 92 of the square root bolt 9 is engaged with each bolt locking hole 63 of the tie plate 6, the square root bolt 9 is in a state in which the rotation is restricted with respect to the tie plate 6. .

  Further, as shown in FIG. 1, a cast iron clip 4 is loosely inserted into the shaft portion 93 of the square root bolt 9. As shown in FIG. 6, the clip 4 has a main body 41 having a J-shaped cross section, and a circular bolt insertion hole 42 is formed through substantially the center of the main body 41. The main body 41 has a fulcrum part 43 formed at one end and a rail pressing part 44 formed at the other end. Further, a packing fitting portion 45 is recessed in the rail pressing portion 44, and two boss holes 46 are formed in the packing fitting portion 45.

  Further, as shown in FIG. 1, a synthetic rubber clip packing 14 is fitted to the packing fitting portion 45 of the clip 4. As shown in FIG. 7, the clip packing 14 has a rectangular flat plate-shaped main body 141, and two bosses 142 are projected on the upper surface of the main body 141. These bosses 142 are fitted in the boss holes 46, and the main body 141 is fitted in the packing fitting portion 45.

  Further, as shown in FIG. 1, the bamboo spring 12 is placed on the upper side of the clip 4 so as to be loosely inserted into the shaft portion 93 of the square root bolt 9. As shown in FIG. 8, the bamboo shoot spring 12 has a structure in which an iron plate is wound in a bamboo shoot shape.

  Further, as shown in FIG. 1, a hexagonal nut 13 is placed on the upper side of the bamboo shoot spring 12 so as to be engaged with the male threaded portion 94 of the square root bolt 9. As shown in FIGS. 5 (b) and 5 (c), the hexagon nut 13 has a hexagonal columnar main body 131, and a female screw portion 132 is formed at the center of the main body 131. And the internal thread part 132 of the hexagon nut 13 is in the state screwed with the external thread part 94 of the square root bolt 9.

  Therefore, the clip 4 is urged downward by the elasticity of the bamboo spring 12 and the fulcrum portion 43 engages with the clip engaging groove 64 of the tie plate 6, and at the same time, the rail pressing portion 44 passes through the clip packing 14. The bottom of the rail 3 is pressed down.

  Further, as shown in FIG. 1, the rail screw nails 15 are screwed into the synthetic sleepers 2 in the nail holes 65 of the tie plate 6, and as a result, the tie plate 6 has the synthetic sleepers 2. It is in a fixed state.

  Since the track 1 has the above-described configuration, railway vibrations generated by vehicle travel are absorbed by the vibration absorbing pad 8 and attenuated.

  At this time, since the damping pad 8 includes the high damping rubber 81, the high damping rubber 81 is sufficiently compressed in the thickness direction (vibration direction of the rail 3) to sufficiently absorb the railway vibration. it can.

  Further, when the high damping rubber 81 is subjected to railway vibration and is compressed in the thickness direction, it expands in the horizontal direction (a direction perpendicular to the vibration direction of the rail 3), but the side faces the wall portion 72 of the pad case 7. Since they are in contact, they are pushed back from the wall 72. As a result, the vibration absorbing pad 8 returns to the original state immediately after compression.

  Therefore, even when a repeated load having a high frequency is applied, the load every time can be sufficiently relaxed. As a result, it is possible to suppress the impact on the roadbed through sleepers, improve the riding comfort of the train, and further reduce noise.

  In order to confirm such an effect, the vibration absorbing pad 8 in which the second type track pad 82 is pasted on the high damping rubber 81 and the vibration absorbing pad 8 composed only of the second type track pad 82 are manufactured as trials, and a compression spring test is performed for each. Went. The results are shown graphically in FIG. In the graph of FIG. 9, the horizontal axis represents the displacement (mm) of the vibration absorbing pad 8, and the vertical axis represents the load (kN) acting on the vibration absorbing pad 8.

  As is clear from FIG. 9, the vibration absorbing pad 8 in which the second type track pad 82 is affixed to the high damping rubber 81 is more effective in absorbing the vibration of the railway than the vibration absorbing pad 8 made up of only the second type track pad 82. (Area surrounded by history curve) increased. This is probably because the high-damping rubber 81 has a higher damping effect than the second-type track pad 82. In addition, the vibration absorbing pad 8 in which the second type track pad 82 is bonded to the high damping rubber 81 is returned to the original state after the unloading, similarly to the vibration absorbing pad 8 including only the second type track pad 82. .

  From the above results, the above-described operational effects are proved.

  In the above-described embodiment, the case where the synthetic resin pad case 7 is used has been described. However, the material of the pad case 7 is not limited to the synthetic resin, but a pad made of a hard material such as hard rubber. Case 7 may be used.

  In the above-described embodiment, the case where the vibration absorbing pad 8 in which the second type track pad 82 is pasted on the high damping rubber 81 has been described, but the insulating property is not required between the pair of rails 3 ( For example, in the case of using the synthetic sleeper 2 or the wooden sleeper, the vibration absorbing pad 8 made of only the high damping rubber 81 may be used. In this case, the second-type track pad 82 is not necessary, and the manufacturing cost of the vibration absorbing pad 8 can be reduced.

  In the above-described embodiment, the case where the high damping rubber 81 is used as the low resilience member has been described. However, a low resilience member other than the high damping rubber 81 can be substituted.

  In addition, in the above-mentioned embodiment, although the case where the synthetic sleeper 2 was used as a sleeper was demonstrated, sleepers other than the synthetic sleeper 2 (for example, a wooden sleeper, RC sleeper, PC sleeper, iron sleeper) And cast iron sleepers) can be substituted.

1 is a half sectional view showing an embodiment of a vibration damping fastening device according to the present invention. It is a figure which shows a tie plate, Comprising: (a) is the top view, (b) is the front view. It is a figure which shows a pad case, Comprising: (a) is the top view, (b) is the front view. It is a figure which shows a vibration absorption pad, Comprising: (a) is the top view, (b) is the front view. It is a figure which shows a fastener, Comprising: (a) is a front view of a square root bolt, (b) is a top view of a hex nut, (c) is a front view of a hex nut. It is a figure which shows a clip, Comprising: (a) is the top view, (b) is the front view. It is a figure which shows clip packing, Comprising: (a) is the top view, (b) is the front view. It is a figure which shows a bamboo child spring, Comprising: (a) is the top view, (b) is the front view. It is a graph showing the damping characteristic of railway vibration.

Explanation of symbols

1 …… Orbit 2 …… Synthetic sleeper
3 ... Rail 4 ... Clip 5 ... Vibration damping fastening device 6 ... Tie plate 7 ... Pad case 71 ... Bottom 72 ... Wall 8 ... Damping pad 81 ... High damping rubber (low resilience member)
82 …… Type 2 orbit pad

Claims (5)

A vibration damping fastening device for fastening a rail to a sleeper,
A vibration absorbing pad including a low resilience member is inserted between the sleeper and the rail,
2. The vibration damping fastening device according to claim 1, wherein the low repulsion member is restrained from expanding in a direction perpendicular to the vibration direction of the rail. The low resilience member is housed in a pad case,
The vibration damping fastening device according to claim 1, wherein a side surface of the low repulsion member is in contact with a wall portion of the pad case.   The vibration damping fastening device according to claim 1, wherein the low repulsion member is a high damping rubber.   The vibration damping fastening device according to any one of claims 1 to 3, wherein the vibration absorbing pad is formed by pasting a second-type track pad on high damping rubber.   A track, wherein a rail is fastened to a sleeper by the vibration damping fastening device according to any one of claims 1 to 4.

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