JP2007113300A - Track structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a track structure which is proof against deviation of a track pad from a rail due to expansion/contraction of the rail. <P>SOLUTION: According to the track structure, the track pad 3 is formed of a rubber plate, and interposed between a tie plate 2 and a bottom surface of the rail 5. Then a resin plate 4 is interposed between the track pad 3 and the bottom surface of the rail 5. The resin plate 4 exerts insulation properties, and a friction coefficient on an upper surface thereof is lower than that of an upper surface of the track pad 3. The resin plate 4 is stuck to the upper surface of the track pad 3 such that both ends 4a, 4b thereof in a rail 5 longitudinal direction are bent at respective edges of the track pad 3 in the rail 5 longitudinal direction along respective external end faces of the track pad. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a track structure in which a track pad is provided between a tie plate and a rail bottom surface.

  In a general track structure, a track pad made of a rubber plate is provided between the tie plate and the rail bottom surface in order to absorb vibration and reduce noise when the train is running. In addition, as shown in FIG. 6, in order to remove the rail joint, which is the greatest weak point of the track, a long rail 100 which is a continuous rail by welding the rail joint is widely used. The long rail 100 has a length of one rail of 200 m or more.

  The rail expands and contracts according to temperature changes. As shown in FIG. 6, the long rail 100 cannot be expanded and contracted at the intermediate portion 101 of the rail, but is expanded and contracted at both end portions 102 of the rail, mainly due to a resistance force generated between the road bed and the sleepers. The joint section 103 is provided between the adjacent rails so that a gap is not generated between the adjacent rails due to the expansion and contraction or the ends of the adjacent rails collide and bend. In the joint section 103, the end of the extended rail is allowed to escape to the outside.

  The conventional track pad has a problem that it moves with the expansion and contraction of the rail at both ends 102 of the long rail 100 and shifts from a predetermined position. In order to solve this problem, a steel sheet pasted on a track pad is used (for example, see Patent Document 1 or 2). In this track pad with a steel plate, the steel plate and the bottom surface of the rail are in contact with each other, so that it is easy to slip and prevents the rail from shifting due to the expansion and contraction of the rail.

JP-A-10-237802 JP 2004-44113 A

  However, in the track pad with a steel plate described in Patent Document 1 or 2, rust is gradually generated on the surface of the steel plate, and the rail becomes difficult to slide on the steel plate due to the frictional resistance of the surface roughened by the rust. There existed a subject that the track pad with a steel plate slipped. If the track pad is displaced and disengaged from the rail, maintenance labor increases.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide a track structure in which a track pad is hardly displaced due to expansion and contraction of a rail.

  The track structure according to the present invention is a track structure in which a track pad is provided between a tie plate and a rail bottom surface, the track pad is made of a rubber plate, and the friction coefficient of the top surface is the friction of the top surface of the track pad. A resin plate having an insulating property lower than a coefficient is provided between the track pad and the rail bottom surface, and the rail is placed on the resin plate.

  In the track structure according to the present invention, the rail is mounted on the resin plate whose upper surface friction coefficient is lower than the friction coefficient of the upper surface of the track pad, and the rail is easy to slide on the resin plate. The movement of the track pad is difficult to occur, and the track pad is difficult to shift. For this reason, the labor for maintenance of the displaced track pad can be reduced.

  In the track structure according to the present invention, the resin plate may be affixed on the track pad. In this case, the resin plate and the track pad are integrated and are not easily displaced from each other. For this reason, it is effective to make it difficult for the resin plate and the track pad to move and shift due to the expansion and contraction of the rail.

  In the track structure according to the present invention, the resin plate may be attached to the track pad such that both ends of the rail in the length direction are bent downward outside the track pad. In this case, the resin plate and the track pad are not easily displaced from each other in the length direction of the rail. For this reason, it is effective to make it difficult for the resin plate and the track pad to move and shift due to the expansion and contraction of the rail.

  The track structure according to the present invention may have a steel plate on the track pad, and the resin plate may be placed on the steel plate with a friction coefficient of an upper surface being lower than a friction coefficient of the upper surface of the steel plate. In this case, since the existing track pad with steel plate can be used as it is and the track pad can be made difficult to shift, the introduction cost can be reduced. As a result of investigating the cause of rust on the surface of the steel plate with the conventional track pad with steel plate, it was found that the major cause is galvanic corrosion due to the contact between the steel plate and the bottom of the rail. In the track structure according to the present invention, since the rail is not on the steel plate but on the insulating resin plate, there is no electric corrosion, and the rail is less likely to slip due to the electric corrosion rust, and the rail expands and contracts. At the same time, the track pad can be prevented from shifting.

  When it has a steel plate on the said track pad, it is preferable that the said resin plate is welded to the upper surface of the said steel plate. In this case, since the resin plate adheres to the steel plate and the rail easily slides on the resin plate, the track pad does not easily move due to the expansion and contraction of the rail, and the track pad does not easily shift.

  Moreover, when it has a steel plate on the said track pad, the said steel plate has two pairs of bending pieces hold | maintained on both sides of the length direction of the rail of the said track pad, and the both ends of the length direction of a rail are the said The outer side of the track pad may be bent downward, the resin plate may be welded to the upper surface of the steel plate, and both ends in the length direction of the rail may be bent downward along the upper surface of the steel plate. In this case, since the rail is easy to slide on the resin plate, the track pad hardly moves due to the expansion and contraction of the rail, and the track pad is not easily displaced. Since the resin plate is in close contact with the steel plate and both ends are bent downward along the upper surface of the steel plate, the resin plate is not easily displaced in the length direction of the rail with respect to the steel plate. Since the steel plate holds the track pad with two pairs of bent pieces, the steel plate is not easily displaced from the track pad. For this reason, the phenomenon that the resin plate and the track pad move and shift due to the expansion and contraction of the rail can be effectively prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the track structure which cannot produce the shift | offset | difference of the track pad by expansion / contraction of a rail can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a track structure according to an embodiment of the present invention.
As shown in FIG. 1, the track structure 1 includes a tie plate 2, a track pad 3, a resin plate 4, a rail 5, and a leaf spring 6.

  As shown in FIG. 1, the tie plate 2 is made of iron and has a substantially rectangular substrate 2a and a pair of shoulders 2b that are integrally provided so as to protrude substantially vertically upward with respect to the upper surface of the substrate 2a. is doing. Each shoulder 2b extends along the width direction of the substrate 2a, and is provided in parallel to each other with a predetermined interval. The tie plate 2 is provided on a sleeper (not shown) with the width direction of the substrate 2a aligned with the length direction of the track.

  As shown in FIG. 2, the track pad 3 is made of a rectangular rubber plate, and has a plurality of U-shaped grooves 3 a provided on the bottom surface in parallel with each other at equal intervals along the length direction. The resin plate 4 is rectangular and insulative, and is affixed on the track pad 3 with its length direction aligned with the track pad 3 length direction. The resin plate 4 has both ends 4a and 4b in the length direction bent toward the track pad 3 at both ends 3b and 3c in the length direction of the track pad 3, and the both ends 3b and 3c of the track pad 3 are sandwiched and held. . The resin plate 4 is preferably made of nylon 66, and the friction coefficient of the upper surface is lower than the friction coefficient of the upper surface of the track pad 3. As shown in FIG. 1, the track pad 3 and the resin plate 4 are provided between the shoulders 2 b of the tie plate 2 with the length direction aligned with the length direction of the track.

As shown in FIG. 1, the rail 5 is placed on the resin plate 4 between the shoulders 2 b of the tie plate 2. The rail 5 is provided along the length direction of the track.
As shown in FIG. 1, the leaf spring 6 has a shape in which the other end 6b side is superimposed on the one end 6a side, and the rail bottom 5a is pressed from above by the one end 6a, and the mounting hole and the other end on the one end 6a side are pressed. The bolt 7 protruding upward from the shoulder 2b is inserted into the mounting hole on the 6b side, the intermediate bent portion is held by the projections 2c and 2d of the substrate 2a so as to cover the shoulder 2b, and the nut 8 is fastened to the bolt 7 to tighten the shoulder 2b. It is fixed to.

Next, the operation will be described.
In the track structure 1, the rail 5 is placed on the resin plate 4 whose upper surface friction coefficient is lower than that of the upper surface of the track pad 3, and the rail 5 easily slides on the resin plate 4. The track pad 3 does not easily move due to the track pad 3, and the track pad 3 is difficult to shift. For this reason, the repair expense for returning the track pad 3 which shifted | deviated to the original even if the rail 5 is lifted can also be reduced.

  The resin plate 4 is affixed on the track pad 3, and the resin plate 4 and the track pad 3 are integrated so that they are not easily displaced from each other. Further, both ends 4a and 4b in the length direction of the rail 5 of the resin plate 4 are bent toward the track pad 3 at both ends 3b and 3c in the length direction of the rail 5 of the track pad 3, and both ends 3b and The resin plate 4 and the track pad 3 are not easily displaced from each other in the length direction of the rail 5. For this reason, it is effective in making it difficult for the resin plate 4 and the track pad 3 to move and shift due to the expansion and contraction of the rail 5.

  In the track structure 1, the rail 5 is not on the steel plate of the existing track pad with steel plate, but on the insulating resin plate 4. It becomes difficult to slip, and the track pad 3 can be prevented from shifting as the rail 5 expands and contracts.

  As shown in FIG. 3, a steel plate 9 may be bonded on the track pad 3. The steel plate 9 has its lengthwise ends 9a and 9b protruding outside the lengthwise ends 3b and 3c of the track pad 3 so as to sandwich the tie plate 2 in its width direction and bent to the track pad 3 below. ing. The steel plate 9 has two pairs of bent pieces 9c that are held between both ends 3b and 3c of the track pad 3. The bent piece 9c is formed by cutting the steel plate 9 and bending the cut portion downward. Although omitted in FIG. 3, the resin plate 4 is welded to the entire upper surface of the steel plate 9, and both ends of the resin plate 4 are bent downward along the upper surface of the steel plate 9. The welding of the resin plate 4 can be performed by heating the steel plate 9 to a temperature at which the resin plate 4 melts and placing the resin plate 4 thereon.

  In the modification shown in FIG. 3, the rail 5 is likely to slide on the resin plate 4, so that the track pad 3 is not easily moved due to the expansion and contraction of the rail 5, and the track pad 3 is not easily displaced. Since the resin plate 4 is in close contact with the steel plate 9 and both ends are bent downward along the upper surface of the steel plate 9, the resin plate 4 is less likely to be displaced in the length direction of the rail 5 with respect to the steel plate 9. Since the steel plate 9 holds the track pad 3 with the two pairs of bent pieces 9c, the steel plate 9 is not easily peeled off from the track pad 3 and is not easily displaced. Further, since the steel plate 9 sandwiches the tie plate 2, it is more effective in preventing the phenomenon that the resin plate 4 and the track pad 3 move and shift due to the expansion and contraction of the rail 5. Instead of welding the resin plate 4 to the steel plate 9, the resin plate 4 may be formed in the shape of the steel plate 9, the resin plate 4 may be used instead of the steel plate 9, and the welding of the resin plate 4 may be omitted.

[Friction resistance test]
The test which investigates the friction resistance of the track pad 3 with the resin board 4 which concerns on the track structure 1 of embodiment of this invention, and the existing track pad with a steel plate was done.
Two test samples were prepared as existing track pads with steel plates, one that was actually used in the track and causing contact rust, and one new one that did not generate contact rust. The steel plate is made of stainless steel. As the track pad 3 with the resin plate 4, one using a resin plate made of HMP and one using a resin plate made of nylon 66 were prepared.

  As shown in FIG. 4, the test sample is prepared by arranging two tie plates 2 on which a track pad 3 with a resin plate 4 or a track pad with a steel plate is placed and attaching a rail 5 thereon. At this time, the rail 5 has a length of 70 cm and a weight of 60 kg, and the fastening torque of the rail 5 is 600 kgf · cm.

  As shown in FIG. 4, in the test, the test sample is placed on the test stand 51 and fixed, and both ends of the rail 5 are sandwiched between a pair of hydraulic cylinders 52 and pushed in one direction, and the bottom surface of the rail 5 and the resin are fixed. The pressure applied to the rail 5 when the plate 4 or the steel plate was displaced was measured. The test was performed three times for each test sample.

  As shown in Table 1 and FIG. 5, the existing track pad with a steel plate has a very small frictional resistance between the steel plate and the bottom surface of the rail 5 when it is new, but has a large frictional resistance when contact rust occurs. Become. Thereby, it was confirmed that generation | occurrence | production of electrolytic corrosion rust causes the track pad 3 to shift | deviate with the expansion-contraction of the rail 5. FIG.

  Further, the track pad 3 with the resin plate 4 made of nylon 66 has a frictional resistance smaller than that of a new track pad with a steel plate, but is smaller than that of a track pad with a steel plate in which contact rust has occurred. Since the track pad 3 with the resin plate 4 made of nylon 66 does not generate electric contact rust, the rail 5 is less likely to slip due to electric corrosion rust, and the track pad 3 can be prevented from being displaced along with the expansion and contraction of the rail 5. . For this reason, compared with the existing track pad with a steel plate, a lifetime is long and the maintenance labor and cost can be reduced.

  In addition, since the track pad 3 with the resin plate 4 made of HMP has the same frictional resistance as the track pad with the steel plate with the contact rust, the track pad 3 may be shifted as the rail 5 expands and contracts. It was confirmed that there was.

It is a cross-sectional view which shows the track structure of embodiment of this invention. It is (a) top view, (b) right side view, and (c) front view showing a track pad and a resin plate of the track structure shown in FIG. It is (a) top view which shows the principal part of the modification of the track structure shown in FIG. 1, (b) Right view, (c) Front view. It is a front view which shows the frictional resistance test apparatus of a track pad. It is a graph which shows the result of the frictional resistance test of the track pad with a resin board, and the track pad with a steel plate. It is a top view which shows a long rail.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Track structure 2 Tie plate 2a Shoulder 3 Track pad 4 Resin board 5 Rail 6 Leaf spring 7 Bolt 8 Nut 9 Steel plate

Claims (6)

A track structure in which a track pad is provided between the tie plate and the bottom of the rail,
The track pad is made of a rubber plate,
Between the track pad and the rail bottom surface, a resin plate having an insulating property lower than the friction coefficient of the top surface of the track pad and having a friction coefficient on the top surface,
That a rail is placed on the resin plate,
Characteristic orbit structure. The resin plate is affixed on the track pad,
The track structure according to claim 1, characterized in that: The resin plate is attached to the track pad with both ends in the length direction of the rail bent downward on the outside of the track pad,
The track structure according to claim 1 or 2, characterized in that A steel plate on the track pad;
The resin plate has a friction coefficient on the upper surface lower than that on the upper surface of the steel plate, and is placed on the steel plate,
The track structure according to claim 1, characterized in that: The resin plate is welded to the upper surface of the steel plate,
5. The track structure according to claim 4, wherein The steel plate has two pairs of bent pieces that are held between both ends of the track pad in the length direction of the rail, and both ends in the length direction of the rail are bent downward outside the track pad, and the resin The plate is welded to the upper surface of the steel plate, and both ends in the length direction of the rail are bent downward along the upper surface of the steel plate,
5. The track structure according to claim 4, wherein

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