JPH0430001A - Bridge crosstie - Google Patents

Abstract

PURPOSE:To distribute the weight pressure of wheels by providing packings mounted on at least one of track bridge beams and a crosstie main body slantly arranged between the bridge beams, and making the width of the packings wider than the width of the crosstie main body. CONSTITUTION:Track bridge beams 11, 12 with the same height, packings 21, 22, and a crosstie main body 20 integrally arranged between the bridge beams 11, 12 are provided, the width W2 of the packings 21, 22 is made wider than the width W1 of the crosstie main body 20, and the height of one of them is made higher than that of the other. The main body 20 is slantly arranged between the bridge beams 11, 12, hook sections 31 and nuts 32 are fastened to the packings 21, 22 and the main body 20 to hook them on the bridge beams 21, 22, and they are fixed to crossties 2. When the stress generated on the crossties 2 and the packings 21, 22 by the action of the wheel weight on rails 4 is transferred to the bridge beams 11, 12, the stress is distributed because the width of the packings 21, 22 is made wider. The shock of a train is absorbed, and the occurrence of track aberration can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a bridge sleeper used in a curved track section of a bridge girder type.

<Conventional technology> Gradual artificial destruction caused by train loads is unavoidable on railway tracks, and well distributing the train loads over the roadbed reduces such artificial destruction and suppresses track deviations. This is essential for reducing maintenance and inspection man-hours.
This makes it possible to reduce track correction costs and train oscillations.

In railway tracks, a track bed is usually provided on the roadbed, and sleepers are placed on the track bed at predetermined intervals, and the rails are supported by the sleepers. The state of wheel load support on this track is such that the rails directly support the vehicle, the sleepers distribute the pressure from the rails to the roadbed, and the trackbed distributes the pressure from the sleepers to the roadbed. The more dispersed the falling pressure distribution is, the more effective it is at absorbing shocks when trains pass and preventing track deviations.

On the other hand, in the railway track mentioned above, the rails are actually in contact with the trackbed even between the sleepers. Therefore, mechanically, the entire length of the beam is supported on a continuous planar foundation, and the amount of subsidence y of the rail due to the wheel load, or the pressure p received from the track bed or sleepers, is d 4 y ■ EIR + ky = O p = given by 3' ■ (
EI is the bending rigidity of the rail, and k is the rail subsidence coefficient, that is, the reaction force coefficient when the rail subsides by a unit depth). Therefore, if the wheel load is W and the point of application of the wheel load is χ = 0, then d
From the boundary condition of 2EI stop lead d2.3-W in y-o arrangement dχ, y=o at χ→ω, y = A e ” (cosβz+sinβχ)-■
Therefore, P=-e"(cosβz+sinβχ)-〇The problem to be solved〉T.Is it necessary to make the rail height on the outer track side higher than the rail height on the inner soft side to balance the circumstances? Conventionally, in bridges, the sleepers are supported by bridge girders, and the height of the bridge girder on the outer track side is higher than the height of the bridge girder on the inner soft side. There is a gap between the bridge girder and the width of this gap is considerably larger (approximately 1.5 times) than the width of the sleeper. Therefore, it is difficult to expect effective dispersion of the wheel load pressure by the above-mentioned type 0.Therefore, it is disadvantageous for shock absorption when a train passes through a curve.

An object of the present invention is to provide a bridge sleeper that can effectively disperse wheel load pressure on a bridge girder type track.

<Means for Solving the Problems> The bridge sleeper according to the present invention comprises packing mounted on at least one of the bridge girders on both sides of the track and a sleeper main body installed in an inclined state between the bridge girders via the packing. The width of the upper end of the packing is equal to that of the sleeper body, and the width of the lower end of the packing is wider than the width of the sleeper body. It is the composition.

<Explanation of Examples> Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1A is a perspective view showing a bridge girder type track using sleepers of the present invention, FIG. 1B is a front view showing the same track, and FIG. 1C is a side view showing the same track. In the first countryman to Figure 1C, 11 and 12 are bridge girders, and the heights of the bridge girders are the same. 2 is a sleeper according to the present invention, and has packings 21 and 22 mounted on each bridge girder, and a sleeper main body 20 installed between the bridge girders via these packings, and these are integrally connected. It has become a reality. Each packing 21/22 ll W
, is wider than the width W2 of the sleeper body 20, and the height of one packing 21 is higher than the height of the other packing 22. Therefore, the sleeper main body 20 is installed in an inclined state between the bridge girders. 3 is a hook bolt,
As shown in FIG. 2, it is inserted into the packings 21, (22) and the sleeper main body 20, and the hook portion 31 is locked to the bridge girder,
The sleeper is fixed to the bridge girder by tightening the oak 1-32. 4.4 is a rail fixed on the railroad ties.

Reference numeral 5 denotes a footboard laid between the rails, which can be omitted. The sleepers can be made of natural wood or synthetic wood, such as long M&fibers (e.g., crow roving) that are continuous in the longitudinal direction and impregnated with thermosetting resin foam (e.g., hard urethane resin). Usually iron is used.

In the above, when wheel load acts on the rail, stress is generated on the sleepers and packing, and under such stress, the wheel load pressure is transmitted to the bridge girder, or the packing 111 is made wider than the sleeper l-+. Therefore, the pressure can be well distributed during packing. Therefore, the impact when a train passes can be better absorbed, and the occurrence of track deviation can be better prevented.

” 1, it is desirable that the packing “11” be as wide as possible, and usually the sleeper body “11 1.4 ~
It is 2.0 times. If it is less than 1.4 times, the above-mentioned pressure dispersion effect is insufficient, and if it is more than 2.0 times, it becomes difficult to arrange the packings due to collisions between them. It is convenient for handling to integrate the sleeper main body and the packing in advance, and adhesives such as epoxy adhesives are usually used to secure them together, but nails, wood screws, Pol I... Oak 1~
They can also be integrated by, etc. Furthermore, as shown in FIG. 3, a groove 23 may be provided on the sleeper main body 20, and the packing 21 (22) may be fitted into this groove 23. This fitting can also be combined with adhesives, nails, wood screws, or bolts and nuts. When synthetic wood is used for the packing, it is preferable that the direction of the long fibers of the sleeper body and the direction of the long fibers of the packing are perpendicular to each other.

In addition, when packing is made of synthetic wood, multi-layer 1'M
fi, and the directions of the long fibers of the layers that are in contact with each other in the upper and lower directions can be perpendicular to each other. The length of the packing (not shown by q in Figure 2) needs to be slightly longer than the bridge girder plate [11] to secure the bolt insertion hole 30.
Normally, it is about 1.5 to 2.5 times the bridge girder grade "11," and preferably about 2.0 times.The lower surface of the packing is attached to the plate part of the bridge girder, as shown in Figure 4. It is also possible to provide a notch and a groove 24 for matching.

In the bridge sleeper according to the present invention, as shown in FIG.
Packing 21 may be provided only on the outer track side of the sleeper main body, only a height adjustment lever 25 may be provided on the inner soft side, and the rail 25 may be supported on the bridge girder 12. Alternatively, as shown in FIG. 6, the inner soft side may be supported on the bridge girder 12 by a horizontal plane 26 cut by a predetermined dimension without providing a height adjustment mechanism. Also,
As shown in FIG. 7, +jJ of the inner soft side packing 22 may be equal to the width of the sleeper main body 20. The relationship between the height and width of the outer track side packing needs to be determined from the viewpoint of stability against axial pressure, and is particularly important when the height of the packing is greater than the height of the sleeper body. As shown in Figure 8, the rails of the track are subject to parallel components due to the weight of the vehicle on the arrangement surface, the running or braking force of the motor vehicle, and the friction force due to wheel slippage that occurs when turning when passing through a curve. The Heisei component etc. act as an axial force, and this axial corner I
・The moment MI that tries to overturn 22 (the overturning fulcrum is A) is Mt-(h+4-h2) I-1,
On the other hand, due to the wheel load F, the moment M that resists the above-mentioned fall
2 is M2-FW-U-, and the safety factor S against falling is S-concave U2 h up, H0 M2 W, F. In order to reduce the burden of 3), W, is h,
, h2 is effective.

As described above, in the bridge sleeper according to the present invention, the inside of the packing is made wider than the width of the sleeper body, and this packing disperses the wheel load pressure while propagating it to the bridge girder, thereby effectively absorbing the impact when a train passes. The pressure distribution state in the packing is roughly as shown by the dotted line in FIG. The lower end of the packing can also be made wider than [11] of the sleeper body.

<Effects of the Invention> The bridge sleepers according to the present invention have the configuration as described above, and unlike the case where the rails are supported on a continuous planar foundation composed of sleepers and the trackbed on conventional tracks, the bridge sleepers according to the present invention are Support at multiple points at intervals is also σ), or the packing is wider under the sleeper body than in the body itself.Ra! Therefore, this packing can disperse the wheel load pressure well, effectively absorb the shock when a train passes on a bridge girder type track curve, and can effectively prevent the occurrence of track stiffness.

[Brief explanation of drawings]

Fig. 1A is a perspective view showing a bridge girder type track using sleepers according to the present invention, Fig. 1B and Fig. 1C are respectively Fig. 1Δ
2 is an explanatory view showing the details of the hook port tightening part located at 11'ff113, and Figures 3, 4, 5, and 6 are the same as the front view and side view. FIG. 7 is an explanatory diagram showing another embodiment of the present invention, FIG. 8 is an explanatory diagram showing the falling stability of the sleeper of the present invention, and FIG. 9 is an explanatory diagram showing another embodiment of the present invention. .

Claims (3)

[Claims] (1) It has a packing mounted on at least one of the bridge girders on both sides of the track and a sleeper main body installed in an inclined state between the bridge girders via the packing, and the width of the packing is wider than the width of the sleeper main body. A bridge sleeper characterized by the fact that (2) It has a packing mounted on at least one of the bridge girders on both sides of the track and a sleeper main body installed in an inclined state between the bridge girders via the packing, and the width of the upper end of the packing is equal to the width of the sleeper main body. , a bridge sleeper characterized in that the width of the lower end of the packing is wider than the width of the main body of the sleeper. (3) The bridge sleeper according to claim (1) or (2), characterized in that the width of the packing is larger than the height of the packing.