JPH041301A - Vibration-proof device for roadbed - Google Patents

Abstract

PURPOSE:To obtain sufficient damping property by interposing a highly damping laminated rubber etc. which inhibits horizontal vibration between the bracket and roadbed slab on concrete subgrade and gives sufficient damping property against vertical vibration. CONSTITUTION:A laminated rubber 2 is installed on a concrete subgrade 1, the laminated rubber 2 being a damping laminated rubber with less damping amount than the standard laminated rubber of natural rubber base which has no problem of creep etc. on a concrete subgrade 1 or the conventional highly damping laminated rubber, and being soft in the vertical direction. Next, a roadbed slab 3 is positioned on the laminated rubber 2 by interposing laminated rubber 4 between the incline face 3a of roadbed slab 3a and the inclined face 1a, which is parallel to the inclined face 3a, on a bracket 1a of the subgrade 1. The laminated rubber 4 is formed from highly damping rubber or viscoelastic material which inhibits horizontal vibration and has sufficient damping property against vertical vibration. This construction offers sufficient damping property against vertical and horizontal vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration isolating device for a trackbed of a railway, an automobile road, or the like.

[Conventional technique fJ] In general, houses, mass buildings, hotels, theaters, etc. built near sources of traffic vibration such as railways and automobile roads.
Buildings such as hospitals, precision machinery factories, computer facilities, and other structures need to take measures to prevent damage from traffic vibrations in addition to the earthquake countermeasures mentioned above.

As shown in Figure 2, conventional anti-vibration measures for railways involve interposing pads or palast mats between the rails and sleepers or between the ballast and the concrete roadbed to pass the rails through the concrete roadbed to buildings, etc. There was something to control it so that the vibrations were not transmitted.

[Problem to be Solved by the Invention 1] However, the conventional ballasted track described above must constantly repair deformation caused by repeated loads from trains, which not only requires high costs, especially labor costs, but also There are problems such as noise and dust during the repair of the train, and in addition, if the anti-vibration mat is softened, it will move horizontally when the train is running, and in order to prevent this, horizontal steady rests are required. Special measures had to be taken, and there were also problems such as creep in the rubber mat or parasmat.

For this reason, it was not possible to make it sufficiently soft, and it had almost no vibration-proofing effect against the low vibrations (60 Hz) that occur when trains run.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to reduce vertical minute vibrations,
That is, the object of the present invention is to provide a road bed vibration isolating device that not only can exhibit a sufficient vibration isolating effect against traffic vibrations, but also is stable over a long period of time without deteriorating its function.

[Means for Solving the Problems] The roadbed vibration isolator of the present invention installs a damping laminated rubber whose damping amount is smaller than that of natural rubber-based standard laminated rubber or conventional high-damping laminated rubber on a concrete roadbed. Then, a roadbed slab is placed on the laminated rubber, and sufficient damping performance is achieved by stopping horizontal vibrations and vertical vibrations between the bracket part formed on the concrete roadbed and the roadbed slab. It is characterized by interposing a laminated rubber made of a highly attenuating laminated rubber or a viscoelastic material.

Further, it is characterized in that the facing surfaces of the trackbed slab and the bracket portion with the laminated rubber interposed therebetween are inclined.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a concrete roadbed, on which are integrally constructed structures 5 such as buildings such as houses, condominiums, hotels, etc., and buildings in which precision machinery and the like are installed.

Laminated rubber 2 is installed on the concrete roadbed 1. The laminated rubber 2 is a natural rubber-based standard laminated rubber that does not cause problems such as creep, or a damping laminated rubber that has less attenuation than conventional high-damping laminated rubber, and has a structure that is soft in the lamination direction, that is, in the vertical direction. ing. A plurality of laminated rubbers 2 may be arranged.

A trackbed slab 3 is placed on the laminated rubber 2. In this embodiment, a single track rail is installed on the trackbed slab 3, but it may also be a single track rail such as IJ[#I or a convenient track. It may be a public road.

The steel surface 3a of the roadbed slab 3 is slightly inclined downward, and the laminated rubber 4 is interposed between it and the bracket portion 1a of the concrete roadbed 1, which forms an inclined surface 1 m' parallel to the inclined side surface 3a. There is.

The laminated rubber 4 is made of high-damping laminated rubber or a viscoelastic material that stops vibrations in the horizontal direction and provides sufficient damping performance for vibrations in the vertical direction.

Since the vibration isolator of this embodiment is constructed as described above, when minute vibrations in the vertical direction due to traffic vibration act on the track bed slab 3, the minute vibrations in the vertical direction are absorbed by the laminated rubber 2. Transmission to the roadbed 1 is prevented. In addition, the laminated rubber 4 attached to the side of the track bed slab 3
It also stops vibrations in the horizontal direction, exhibits sufficient damping performance against vibrations in the vertical direction, and does not transmit to the concrete roadbed 1.

In addition, the inclination angle of the above-mentioned inclined side surface 3a and inclined surface 1a' may be changed, the dimensions such as the size and thickness of the laminated rubber 4, etc.
By changing the attenuation characteristics etc., the required attenuation performance can be obtained.

[Effect of the invention 1 (1) Sufficient vibration isolation performance against minute vibrations such as traffic vibrations can be achieved.

(2) For structures such as houses, condominiums, hotels, theaters, hospitals, etc. built in spaces near sources of traffic vibration such as tracks and roads, as well as buildings such as precision machinery factories and hump equipment facilities. However, it is possible to take measures to prevent damage caused by traffic vibrations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the vibration isolating device of the present invention, and FIG. 2 is a sectional view of a track having a conventional vibration isolating structure. 1... Concrete roadbed, 1a... Bracket part,
1m'... Sloped surface, 2... Laminated rubber, 3... Roadbed slab, 3a... Slanted side, 4... Laminated rubber.

Claims (1)

[Scope of Claims] 1. Damping laminated rubber having a lower attenuation amount than natural rubber-based standard laminated rubber or conventional high-damping laminated rubber is installed on the concrete roadbed, and a roadbed slab is placed on the laminated rubber. The structure is made of high-damping laminated rubber or viscoelastic material that stops vibrations in the horizontal direction and provides sufficient damping performance against vibrations in the vertical direction between the bracket part formed on the concrete roadbed and the roadbed slab. A vibration isolating device for a road bed characterized by interposing laminated rubber. 2. The track bed vibration isolating device according to claim 1, wherein opposing surfaces of the track bed slab and the bracket portion with the laminated rubber interposed therebetween are inclined.