JPS5916041B2 - Anti-vibration track structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on patent application No. 115594 filed in 1973 (Japanese Patent Application Laid-Open No. 51-422), which is related to the invention of the present inventor.
This is related to the improvement of the anti-vibration track structure (see Publication No. 03), in which walls are provided on both sides of the concrete slab or concrete track bed, and grooves provided in each of the walls are inserted under both ends of the rail holding beam. The half parts are fitted and arranged, and an elastic material is interposed between the lower half parts on both end sides and the groove, and a laying elastic material is interposed between the rail holding beam and the track bed. is provided only in the lower part of the rail installation surface and is arranged eccentrically from the center of the rail to the outside of the gauge. The point is to reduce the moment of

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

In the figure, reference numeral 1 denotes a rail holding beam, in which walls are provided on both sides of a concrete slab or concrete trackbed 2, and grooves 2a, 2a provided in each of the walls are provided with lower half portions 1a on both ends of the rail holding beam 1. , 1a are fitted and arranged, and the lower half portions 1a, 1a on both end sides and the groove 2a.

Elastic members 5, 5 each having a U-shaped cross section are interposed between them and 2a.

Further, elastic materials 4, 4 are laid only between the lower part of the installation surface of the rails 3, 3 on the rail holding beam 1 and the track bed 2.
In addition, the laying elastic members 4, 4 are arranged eccentrically outward from the center of the rails 3, 3 as shown in the figure, and as described above, the laying elastic members 4, 4 are arranged eccentrically from the center of the rails 3, 3, as shown in the figure. By fitting the lower halves 1a, 1a on both ends of the rail holding beam 1 into the concave grooves 2a, 2a provided in the grooves 2a, 2a, and interposing the elastic members 5, 5, the rail holding beam 1 can be moved back and forth and left and right. The elastic material 4,
4 to maintain the elasticity of the track, and in this way, the laid elastic members 4, 4 do not need to resist the deflection of the rails 3, 3, making it possible to hold the rail holding beam 1 in a small area, and also This makes it possible to use an elastic material with an extremely low spring constant, thereby exhibiting excellent vibration-proofing effects.

Further, the elastic material 5 buffers and absorbs the movement of the rail holding beam 1 in the front, rear, left and right directions, and the contact surfaces of the front, rear, left and right ends of the rail holding beam 1 slide against the inner peripheral surfaces of the grooves 2a, 2a. This prevents movement from interfering with smooth movement in the vertical direction.

In addition, in the figure, 2-b is a drainage groove provided in the center of the track bed 2, 6 is a bolt for fastening the rail holding beam 1 to the track bed 2, and 7 is a drainage groove provided in the center of the track bed 2.
is an embedded plug into which the bolt 6 is screwed, and 8 is a filler used during construction, and the filler is made of a material such as styrofoam that is easily compressed and deformed by the train load. .

In the present invention, the laying elastic material 4 is not disposed directly below the installation surface of the rail 3 of the rail holding beam 1, but is installed on the rail 3.
It is arranged with an eccentric amount e outward from the center line XX of the rail, and is configured to efficiently reduce the bending moment acting on the rail holding beam 1 as described later.

Fig. 5 shows the external force and moment acting on the rail holding beam 1, where Pl and R2 are the rail pressures, Ml and M2 are the moments on the rail support section acting from the torsional moment of the rail, and Ql-Q2 is the same. Rail lateral pressure at rail support, Ll and R2
is the lateral resistance force received from the trackbed, R1 and R2 are the reaction forces of the elastic material 4 from the concrete trackbed, a and e are the lateral resistance force L1 s ''2, the central axis of the rail holding beam, and the center of the rail and the elastic material, respectively. is the amount of eccentricity between the center of

In this case, if the moment at point A directly below the rail on the rail support beam is M, then M=M1 + QI
X a RI X e.

Therefore, in curved sections where Ml and Ql have large values and wheel lateral pressure is large, eccentricity e as described above is not taken, and e =
If O, the moment) M becomes unnecessarily large, so the cross section of the rail holding beam must be made large in design.

In order to eliminate such distortions and make an economical design, the moment (M) acting on the rail holding beam 1 is reduced by providing an eccentricity e that matches the applied load and moment. It is.

In this case, the moment generated by another load condition is set to a reasonable amount of eccentricity in consideration of the moment in the opposite direction and the designed cross section of the rail holding beam.

For example, a representative example of the case where ordinary wooden sleepers are used as rail holding beams is shown below, and the economic effects thereof are as follows.

That is, as a design condition, the thickness of the rail holding beam is 14 cI.
rL, and the embedding depth of the lower half of both ends is 10 cIrL.

Keep the rail level constant, M1=28 t-crn Qt=6 t R1:st
a=9cm28+6X9 =5.1cfrL Appropriate eccentricity e=-, wa.

, -, and the eccentricity e of the laid elastic body is 5±2 to 3
A sufficient effect can be obtained by using CrrL.

Further, under the above design conditions, the maximum positive bending moment M+ that is convex upward and the maximum negative bending moment M- are as follows: M+=28+6 X 9-8 X 5.1=41.2
j-bo M-2-8
It is enough.

On the other hand, when the eccentricity e is not taken, M-=28+6 , this effect can be obtained in almost the same way for various rail holding beams.

Furthermore, the laying elastic body 4 of the present invention holds the rail holding beam 1 in a minimum area, is an elastic material having a low spring constant, and also reduces the bending moment generated in the rail holding beam, making it mechanically stable. In particular, by making the area of the elastic material small (narrowing its width), not only can a low spring constant be obtained, but also the position where the reaction force occurs (R1 in Figure 5) can be clarified to determine the appropriate amount of eccentricity e. can be given with certainty.

In the case of materials with equal positive and negative bending moments, such as wooden sleepers, this appropriate eccentricity e is generally given by M1+Q1a e-□. This requires a large amount of medium waves 2e, making it uneconomical and making it impossible to secure a low spring constant.Therefore, it is best to place the laid elastic material eccentrically to the outside of the track as in the present invention. Furthermore, if the width is expanded more than necessary, it will be difficult to provide uniform elastic support during actual construction, and the point where the reaction force will be generated will become unclear, causing a bending moment on the rail holding beam. Therefore, it is important to keep the necessary minimum area and limit it to the area below the rail installation surface.

The installed elastic material of the present invention is set with sufficient consideration of the mechanical properties of the rail holding beam, load conditions, etc.

As described above, the present invention provides walls on both sides of a concrete slab or a concrete track bed, and arranges the lower halves of both ends of the rail holding beam by fitting into grooves provided in each of the walls. An elastic material is interposed between the lower half of both ends and the groove, and a laying elastic material interposed between the rail holding beam and the track bed is provided only in the lower part of the rail installation surface. In addition, by eccentrically arranging the rail from the center of the rail to the outside of the track, the moment applied to the rail holding beam can be reduced and an economical cross section of the rail holding beam can be designed.

Note that the length of the groove, that is, the depth of engagement in the lower half of both ends of the rail holding beam can be increased or decreased as necessary.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional front view of the left half of an embodiment of the vibration-proof track structure according to the present invention, Fig. 2 is a partial plan view thereof, and Figs. 3 and 4 are respectively shown in the direction indicated by the arrows - ■Figures and IV-IV
FIG. 5 is an explanatory view of the operation of the present invention. 1... Rule holding beam, 2... Track bed, 2a
...Concave groove, 3...Rail, 4...
...Elastic material.

Claims (1)

[Claims] 1. Walls are provided on both sides of the concrete slab or concrete track bed, and the lower halves of both ends of the rail holding beam are fitted into the grooves provided in each of the walls, and the lower halves of the rail holding beams are arranged so that the lower halves of the both ends and the An elastic material is interposed between the rail holding beam and the track bed, and an elastic material is interposed between the rail holding beam and the track bed only at the lower part of the rail installation surface, and from the center of the rail to the outside of the track. A vibration-proof track structure characterized by being eccentrically arranged.