JP2001254301A - Anti-vibration track structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To protect the entire unit sleeper as a single unit by installing a plurality of vibration isolators without separately interposing an elastic body or the like in the lower part near the connection part of the ladder type sleeper. By vibrating, a very excellent vibration-proof performance can be exhibited. SOLUTION: The lower surface of a longitudinal beam 2, 2 and a track slab in a ladder type sleeper 4 formed by combining a pair of right and left vertical beams 2, 2 from a plurality of joint members 3 arranged at predetermined intervals in a rail longitudinal direction. 5, one or a plurality of vibration isolators 6F disposed at both ends in the rail longitudinal direction among a plurality of vibration isolators 6, 6 interposed at predetermined intervals in the rail longitudinal direction. , 6R, the spring constant in the vertical and horizontal directions of one or more vibration isolators 6C, 6C arranged at the center in the longitudinal direction of the rail is set. ing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration track structure and, more particularly, to an elevated track or underground track of a railway,
A vibration-absorbing track structure that absorbs vertical and horizontal front-rear vibrations generated when a railcar travels on rails and suppresses the transmission of the vibrations to track slabs. is there.

[0002]

2. Description of the Related Art Conventionally, as a vibration isolating track structure of this type, a track slab having a pair of rails and a track bed are disclosed, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-248606. The track slab can be displaced up and down, left and right and back and forth with respect to the rail longitudinal direction by arranging a plurality of anti-vibration rubber bearings at predetermined intervals in the longitudinal direction of the rail only at the upper and lower sides and inclined at right and left and back and forth. A floating slab type vibration isolating track structure supported on a roadbed as possible, and a pair of ladder type sleepers extending in the longitudinal direction of a ladder type sleeper supporting a pair of rails as disclosed in, for example, Japanese Patent Application Laid-Open No. 9-268504. Rubber that undergoes shear elastic deformation due to vertical load at predetermined intervals in the longitudinal direction of the rail between the lower surface of vertical beams and the track slab such as concrete roadbed Such as anti-vibration track structure formed by interposing a plurality of anti-vibration apparatus having a sexual body is present.

[0003]

By the way, in the former vibration isolating track structure in which vibration isolating rubber bearings are inclined only between the upper and lower sides of the track slab and the track bed, the vertical and horizontal directions along the longitudinal direction of the rail are used. It is possible to set the vibration characteristics independently of each other, compared to the case where the vertical vibration isolating rubber bearing and the horizontal anti-vibration rubber bearing are installed separately,
Although the installation of the rubber bearings and the maintenance of the rubber bearings after installation are easy and the total number of rubber bearings installed can be reduced, crushed stone or gravel is generally used for the roadbed. Ballast track was adopted, and a drainage layer was required underneath.
For example, in the case of an elevated track, the load applied to the elevated railway becomes heavy, not only has a problem in terms of seismic performance, but also the ballast roadbed gradually collapses due to the impact force and vibration accompanying the vehicle passing,
As a result, there is a problem that the vibration-proofing performance of the vibration-proof rubber bearing decreases with time.

On the other hand, a ladder type sleeper is used, and shear elastic deformation occurs between a lower surface of a pair of longitudinal beams extending in a rail longitudinal direction of the ladder type sleeper and a track slab such as a concrete roadbed by a vertical load. In the case of the latter vibration isolating track structure, in which a vibration isolating device equipped with a rubber elastic body is interposed, the ballast ballast and the drainage layer thereunder are not required, so that not only can construction costs be reduced, but also in the case of elevated tracks, The seismic performance can be improved by reducing the load applied to the vehicle. Furthermore, the strength of the ladder type sleeper is large, and the load when passing through the vehicle is widely distributed along the vertical beam of the sleeper, and is transmitted to the track slab such as the concrete roadbed via multiple vibration isolators Therefore, there is an advantage that the load acting on each vibration isolator can be reduced and the durable life of the vibration isolator can be extended as compared with the former.

In a vibration isolating track structure using a ladder-type sleeper, the characteristics of the vibration isolator alone for sufficiently absorbing the vibrations in the vertical and horizontal directions when passing through the vehicle are as follows. As described above, it is desirable to set the ratio of the vertical spring constant of the rubber elastic body in the vibration isolator to the left-right longitudinal spring constant to 1.0 or less.

However, a conventional anti-vibration track structure using a ladder-type sleeper in which the spring constant ratio of all of a plurality of anti-vibration devices arranged at predetermined intervals in the longitudinal direction of the rail is set to be equal to or less than 1.0. However, the following problems still remain in terms of anti-vibration performance. That is, in general, the ladder-type sleeper is limited to a certain length due to problems in production and transport construction, and a plurality of ladder-type sleepers are sequentially connected at a construction site to complete a sleeper of a desired length. Therefore, since the longitudinal beams of the ladder-type sleepers located adjacent to each other are not joined to each other, the longitudinal beams of the individual ladder-type sleepers are displaced in the vertical and horizontal directions at both ends in the longitudinal direction when passing through the vehicle. Is larger than the displacement of the central part in the longitudinal direction, and in the conventional one in which a plurality of vibration isolators are arranged at predetermined intervals in the longitudinal direction of the rail, all of which have the same ratio between the vertical spring constant and the left-right longitudinal spring constant. However, it is difficult to make the entire unit ladder type sleeper which is a rigid body have an anti-vibration function as an integral object, and consequently there is a problem that it takes a long convergence time to absorb vertical and horizontal vibrations.

[0007] The present invention has been made in view of the above-described circumstances, and only requires installing a plurality of vibration isolators without separately interposing an elastic body or the like in a lower portion near a connection portion of a ladder type sleeper. Accordingly, it is an object of the present invention to provide a vibration-isolating track structure capable of exhibiting extremely excellent vibration-isolating performance in a short time by making the entire unit sleeper function as an integral object.

[0008]

In order to achieve the above object, a vibration isolating track structure according to the present invention supports a pair of rails, and a pair of longitudinal beams extending in the rail longitudinal direction are provided in the rail longitudinal direction. In a ladder-type sleeper united by a plurality of joints arranged at intervals and integrated with the longitudinal beams and the joints, a laminated rubber type or hollow is provided between the lower surface of a pair of longitudinal beams and the track slab, respectively. A vibration isolation track structure in which at least three or more vibration isolation devices that absorb vibrations in the vertical and horizontal directions are interposed at predetermined intervals in the longitudinal direction of the rail. Of the vibration isolators, one is disposed at both ends in the rail longitudinal direction.
The spring constants of one or a plurality of vibration isolators in the up-down direction and the left-right front-rear direction are set at the center of the rail in the longitudinal direction.
It is characterized in that the spring constant of one or a plurality of vibration isolators is set to be greater than the spring constant in the vertical and horizontal directions.

According to the present invention having the above structure, the spring constant in the vertical and horizontal directions and the rail of the laminated rubber type or hollow laminated rubber type vibration isolator arranged on both ends in the longitudinal direction of the rail are shown. The spring constant in the up-down direction and the left-right front-rear direction of the vibration isolator arranged on the center side in the longitudinal direction is
It is rigid when passing the vehicle because it is set to have a large and small difference according to the large displacement in the vertical and horizontal directions acting on both ends in the longitudinal direction when passing through the vehicle and the small displacement acting on the central side in the longitudinal direction. The whole unit ladder type sleeper will exhibit the vibration isolation performance as an integral part, and the vertical and horizontal and front and rear directions can be achieved without interposing an elastic body separate from the vibration isolation device at the lower part near the connection part of the ladder type sleeper Can be absorbed and converged in a short time.

In the vibration isolating track structure having the above-described structure, the ratio of the spring constant in the left-right and front-rear directions to the spring constant in the vertical direction in the plurality of vibration-isolating devices is as described in claim 2.
It is desirable to set it to 0.5 times to less than 1.0 times, and in particular, as described in claim 3, the vertical direction of one or a plurality of vibration isolators arranged at both ends in the rail longitudinal direction. It is desirable to set the ratio of the spring constant in the left-right and front-rear directions to the spring constant in the range of 0.25 to less than 1.0. In this case, it is necessary to extend the durability life of a plurality of vibration isolators. Can be.

In addition, the spring constant in the vertical and horizontal directions of one or a plurality of vibration isolators arranged at both ends in the longitudinal direction of the rail is determined by setting one or more spring constants arranged in the center in the longitudinal direction of the rail. The anti-vibration track structure of the present invention, which is set to be larger than the spring constant in the up-down direction and the left-right front-rear direction of the anti-vibration device, as described in claim 4, at the both ends in the longitudinal direction of the rail, A mode in which the disposed vibration isolator is disposed at a position corresponding to both longitudinal ends of a pair of longitudinal beams in the ladder type sleeper (hereinafter, referred to as type 1), or as described in claim 5, The vibration isolator arranged at the most end on both ends in the longitudinal direction of the rail is located at the center of the ladder-type sleeper by a distance smaller than the pitch (pitch) between the longitudinal ends of the pair of longitudinal beams in the longitudinal direction. Biased to the side A conventional ladder type in which the spring constants in all of the plurality of vibration isolators are set to be equal in the up-down direction and in the left-right and front-rear directions, regardless of the type of arrangement (hereinafter referred to as type 2) arranged at the set position. The damping effect of the whole unit ladder type sleeper is greater than that of the sleeper using vibration sleeper, so that the time for absorbing and converging vibrations in the vertical and horizontal directions can be shortened.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the entire vibration-isolating track structure according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a bottom view in which a track slab is omitted.
1, 1 is a pair of left and right rails, 4 is a ladder type sleeper,
Reference numerals 6 and 6 denote vibration damping devices interposed between the ladder type sleeper 4 and a track slab 5 composed of a concrete roadbed or the like.

The ladder type sleeper 4 supports a pair of rails 1 and 1 and a pair of long (for example, about 12 m) long longitudinal beams 2 and 2 extending in the longitudinal direction of the rail, and is disposed at predetermined intervals in the longitudinal direction of the rail. Then, a plurality of joint members 3 for connecting the pair of vertical beams 2 are integrated with each other, and the whole is configured in a ladder type (ladder type).

The vibration damping devices 6 and 6 are provided on the ladder type sleeper 4 so that the lower surfaces of the pair of longitudinal beams 2 and the track slab 5
And a plurality of them at predetermined intervals in the longitudinal direction of the rail, specifically, nine on each of the right and left sides, for a total of eighteen. Of the nine anti-vibration devices 6 each for left and right, the anti-vibration devices 6F and 6R disposed at the end portions at both ends in the longitudinal direction of the rails are, as shown in FIG. A pair of longitudinal beams 2, 2
Are arranged at positions corresponding to the both ends in the longitudinal direction, and are configured in the type 1 described above.

As shown in FIGS. 5 and 6, each of the vibration isolators 6, 6 has a plurality of elastic rubbers 6c and a plurality of steel plates 6d alternately stacked and fixed vertically between mounting plates 6a, 6b opposed to each other. It is made of laminated rubber, and is configured to absorb vibrations in the vertical and horizontal directions.
Out of the individual vibration isolator devices 6, 6, the three left and right vibration isolator devices 6F, 6R arranged at both ends in the longitudinal direction of the rail have a spring constant in the vertical and horizontal directions, which is the center of the rail in the longitudinal direction. Vibration isolator 6C, 6C, three on each side
About 1-3 than the spring constant in the vertical and horizontal directions
It is set about twice as large. In addition, each of the vibration isolators 6, 6
Among them, the ratio of the spring constant in the left-right and front-rear directions to the spring constant in the vertical direction in the center-side vibration isolator 6C, 6C is
The ratio of the spring constant in the left-right and front-rear directions to the spring constant in the up-down direction in the vibration isolator 6F, 6R at both ends is set between 0.55 and less than about 1.0. It is set to less than about 1.0 times.

As shown in FIGS. 5 and 6, the laminated rubber used as the vibration isolating devices 6 and 6 is composed of upper and lower mounting plates 6.
a, 6b, the plurality of elastic rubbers 6c and the steel plate 6d are not limited to those having a circular horizontal cross section. For example, the upper and lower mounting plates 6a, 6b are rectangular and the plurality of elastic rubbers 6c are formed. Even if the steel plate 6d is circular, even if all of the upper and lower mounting plates 6a and 6b, the plurality of elastic rubbers 6c and the steel plate 6d are rectangular, the upper and lower mounting plates 6a and 6b are circular and The elastic rubber 6c and the steel plate 6d may be rectangular.

A ladder-type sleeper 4 in which a total of 18 vibration isolator devices 6 and 6 having a spring constant set as described above and a total of 18 vibration isolator devices 6 and 6 are installed in a factory or the like is carried into a construction site.
A plurality of the loaded ladder-type sleepers 4 are arranged in a row on a track slab 5 at a construction site, and adjacent ones are sequentially connected as shown in FIG. The anti-vibration track structure is completed.

According to the sleeper type anti-vibration track structure completed as described above, each of the ladder type sleepers 4 has a laminated rubber type or a hollow laminated rubber type of three left and right parts disposed at both ends in the longitudinal direction of the rail. The spring constants of the vibration isolators 6F and 6R in the up-down direction and the left-right front-rear direction are set to be large corresponding to the large vertical and left-right front-rear displacements acting as a resultant force on both ends in the rail longitudinal direction when the vehicle passes. The spring constant in the vertical and horizontal directions of the three vibration isolator 6C, 6C arranged at the center in the longitudinal direction corresponds to a displacement smaller than both ends acting on the center in the longitudinal direction of the rail when the vehicle passes. Because the springs in the vertical and horizontal directions are set harder at both ends and softer toward the center. In some cases, the entire unit ladder type sleeper 4 which is a rigid body exhibits the vibration isolation performance as an integral body, and an elastic body or the like separate from the vibration isolation device 6 is interposed at the lower portion near the connection portion of the ladder type sleeper 4. Even without this, the vibrations in the vertical and horizontal directions can be absorbed and converged in a short time only by the vibration isolators 6 and 6 (6F, 6R and 6C).

The ratio of the spring constant in the left-right and front-rear directions to the spring constant in the up-down direction of each of the vibration isolator devices 6 and 6 is 0.5 to less than about 1.0 at the center and at both ends. A conventional ladder-type sleeper is used, in which the spring constants in all the vertical and horizontal directions are set to be equal to each other from 0.25 to less than about 1.0. As compared with the track structure, not only the damping effect of the entire unit ladder type sleeper 4 can be increased, but also the durable life of all the vibration damping devices can be uniformly increased.

In the above-described embodiment, of the nine vibration-damping devices 6 and 6 on the left and right sides, the vibration-damping devices 6F and 6R disposed at the end portions at both ends in the longitudinal direction of the rail are ladder-type sleepers. 4, the case of the type 1 type arranged at the position corresponding to both ends of the pair of longitudinal beams 2 and 2 in the longitudinal direction has been described. However, as shown in FIG. Vibration damping devices 6F and 6R
Is located at a position deviated toward the center by a distance L smaller than an arrangement interval (pitch: P) of the vibration isolators from both longitudinal ends of the pair of longitudinal beams 2 in the ladder type sleeper 4. Even when applied to the second embodiment, the same vibration damping effect as described above is achieved. In addition, when applied to the type 2 form, as shown in FIG.
The vibration isolator 6A, in which the spring constant in the up-down direction and the left-right front-rear direction is set to be larger than that at the center,
6A may be arranged.

In the above-described embodiment, a total of 18 vibration damping devices 6, 6 are provided on the lower surfaces of the pair of longitudinal beams 3, 3 of the ladder type sleeper 4 at predetermined intervals in the longitudinal direction of the rail. Has been described, but it is sufficient if three or more vibration isolator devices 6 and 6 in total are provided on each of the right and left sides. The spring constant of each of the three left and right vibration isolators 6F and 6R arranged on both ends in the longitudinal direction of the rail is set to be larger than the spring constant of the three left and right vibration isolators 6C and 6C. As described above, the number of the vibration isolator 6F, 6R at both ends for increasing the spring constant may be one or two.

Further, in the above-described embodiment, the case where the laminated rubber type vibration damping devices 6 and 6 are used has been described.
Instead, hollow laminated rubber type vibration damping devices 6 ′, 6 ′ having a hollow central portion may be used. Examples of the hollow laminated rubber type vibration damping device 6 ′ include those illustrated in FIGS. 10A to 14A and FIG. 14B. FIG. 10 shows an upper and lower mounting plate in which a plurality of annular elastic rubbers 6c and steel plates 6d are alternately stacked and fixed between circular upper and lower mounting plates 6a and 6b, and a rectangular upper and lower mounting plate is shown in FIG. Annular elastic rubber 6c and steel plate 6d between 6a and 6b
In FIG. 12, a plurality of circular elastic rubbers 6c and a plurality of circular steel plates 6d are alternately stacked and fixed alternately between rectangular upper and lower mounting plates 6a and 6b. Things. Further, the one shown in FIG. 13 has a plurality of substantially sector-shaped elastic rubbers 6c... Divided in the circumferential direction and a plurality of circular steel plates 6d alternately stacked and fixed between rectangular upper and lower mounting plates 6a and 6b. The one shown in FIG. 14 is one in which a plurality of rectangular elastic rubbers 6c... Divided in the circumferential direction and a plurality of circular steel plates 6d are alternately stacked and fixed alternately between rectangular upper and lower mounting plates 6a and 6b. It is. Regarding the hollow laminated rubber type vibration damping device 6 ′, a plurality of shapes other than the combination of the shapes illustrated in FIGS. 10 to 14 may be used in a state where a hollow is formed at the center between the upper and lower mounting plates 6 a and 6 b. It is sufficient that the elastic rubber 6c and the steel plate 6d are layered and fixed alternately in the upper and lower layers.

[0023]

As described above, according to the present invention, a hard vibration isolator having a large spring constant in the vertical and horizontal directions is disposed at both ends in the longitudinal direction of the rail. By placing a soft vibration isolator in the center where the spring constant in the vertical and horizontal directions is smaller than the extension of the vibration isolator on both ends, the difference between the two ends in the longitudinal direction and the center when the vehicle passes is large. The entire unit ladder type sleeper, which is rigid, can be made to function as a vibration-proof function as a unit against displacements in the vertical and horizontal directions that act in the presence of ruggedness. The ladder-type sleeper absorbs and converges vibrations in the vertical and horizontal directions in a short period of time without interposing an elastic body separate from the vibration isolator at the bottom An effect that can be exhibited fruit.

The ratio of the spring constant in the left-right and front-rear directions to the spring constant in the vertical direction in a plurality of vibration isolators is
The ratio of the spring constant in the left-right and front-rear directions to the spring constant in the vertical direction in one or a plurality of vibration isolators arranged at both ends in the longitudinal direction of the rail. By setting the value between 0.25 times and less than 1.0 times, the vibration damping effect can be improved and the durability life of each of the plurality of vibration damping devices can be uniformly increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the entirety of an anti-vibration track structure according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a bottom view in which a track slab is omitted.

FIG. 4 is a model diagram showing a type 1 ladder-type sleeper.

FIG. 5 is an enlarged vertical sectional view of the laminated rubber type vibration damping device.

FIG. 6 is a plan view of the laminated rubber type vibration damping device.

FIG. 7 is a bottom view showing a connection state of the ladder type sleeper.

FIG. 8 is a model diagram showing a ladder type sleeper of type 2;

FIG. 9 is a bottom view showing a connection state of the ladder type sleeper of the same type 2;

10A is an enlarged longitudinal sectional view showing an example of a hollow laminated rubber type vibration damping device, and FIG. 10B is a cross-sectional bottom view taken along line AA in FIG.

11A is an enlarged longitudinal sectional view showing another example of the hollow laminated rubber type vibration damping device, and FIG. 11B is a cross-sectional bottom view taken along line BB of FIG. 11A.

12A is an enlarged longitudinal sectional view showing another example of the hollow laminated rubber type vibration damping device, and FIG. 12B is a cross-sectional bottom view taken along the line CC in FIG.

13A is an enlarged longitudinal sectional view showing another example of the hollow laminated rubber type vibration damping device, and FIG. 13B is a cross-sectional bottom view taken along line DD of FIG. 13A.

14A is an enlarged longitudinal sectional view showing another example of the hollow laminated rubber type vibration damping device, and FIG. 14B is a cross-sectional bottom view taken along line EE in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rail 2 Longitudinal beam 3 Splicing material 4 Ladder type sleeper 5 Track slab 6 (6F, 6R, 6C, 6A), 6 'Anti-vibration device

Claims (5)

[Claims] 1. A pair of longitudinal beams that respectively support a pair of rails and extend in the longitudinal direction of the rails are joined by a plurality of joints arranged at predetermined intervals in the longitudinal direction of the rails, and the longitudinal beams and the joints are integrated. In the ladder-type sleeper, a rubber isolator that absorbs vibration in the vertical and horizontal directions is provided between the lower surface of a pair of longitudinal beams and the track slab. A vibration isolating track structure comprising at least three or more vibration isolating devices interposed at predetermined intervals in a direction, wherein one or more of the three or more vibration isolating devices are disposed at both ends in the rail longitudinal direction. The spring constant in the vertical and horizontal directions of the vibration isolator is set to be greater than the spring constant in the vertical and horizontal directions of one or a plurality of vibration isolators arranged at the center in the longitudinal direction of the rail. Vibration damping track structure, characterized in that there. 2. The vibration isolator according to claim 1, wherein a ratio of a spring constant in the left-right and front-rear directions to a spring constant in a vertical direction in each vibration isolator is set between 0.5 and less than 1.0. Swing orbit structure. 3. The ratio of the spring constant in the left-right and front-rear directions to the spring constant in the vertical direction in one or a plurality of vibration isolators arranged at both ends in the longitudinal direction of the rail is 0.
2. The value is set between 25 and less than 1.0.
The anti-vibration track structure described in 1. 4. The vibration damping device disposed at the end portion at both ends in the longitudinal direction of the rail is located at a position corresponding to both longitudinal ends of a pair of vertical beams in the ladder type sleeper. 4. The anti-vibration track structure according to any one of 1 to 3. 5. A vibration-isolation device disposed at the most end portion on both ends in the longitudinal direction of the rail is smaller than an arrangement interval of the vibration-isolation devices than both longitudinal end portions of a pair of vertical beams in the ladder type sleeper. 4. The anti-vibration track structure according to claim 1, wherein the anti-vibration track structure is arranged at a position deviated toward the center by a distance.