JPH07138903A - Elastic mat for underside of sleeper - Google Patents

Abstract

PURPOSE:To provide a sleeper to which an elastic mat is bonded so that quarried stones can not be crushed easily into small pieces and lateral slippage of sleeper can be avoided, and further productivity of elastic mat having durability can be improved. CONSTITUTION:The central portion 1a of an elastic mat 1 is made thinner than the opposite end portions 1b, and the central portion 1a is made from an elastic material softer than those of the opposite end portions 1b. And by the elastic mat 1 is vulcanized and simultaneously the central portion of the elastic mat is bonded to the thick opposite end portions by vulcanization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substantially band-shaped elastic mat which is arranged on the bottom surface of a railroad sleeper and elastically supports the sleeper,
In particular, it reduces the train load applied to the central part of the sleepers and prevents lateral sleepiness.

[0002]

2. Description of the Related Art In order to reduce vibration and noise when a vehicle travels on a track, an elastic mat 13 is conventionally arranged on the bottom surface of a sleeper 12 supporting a rail 11 as shown in FIG. 3 (a). There is. The elastic mat of FIG. 3A is adhered to the entire bottom surface of the sleeper with the same thickness, and the entire elastic mat is made of the same elastic material. As described above, it is uneconomical to dispose the elastic mat on the entire bottom surface of the sleeper, and if the lower surface of the elastic mat is flat, the sleeper is easily swayed in the lateral direction. Therefore, the elastic mat shown in FIG. Is also known. That is, in this case, no elastic mat is provided in the central portion 400 to 600 mm of the sleepers, and the elastic mats 13a are arranged only at both ends of the sleepers to prevent the sleepers from being laterally displaced. Further, as shown in FIG. 3 (c), the elastic mat 1 at the center of the sleeper
It is also known that 4a and the elastic mats 14b at both ends of the sleeper are made of different elastic materials, and both elastic mats are formed to have the same thickness and adhered to the bottom surface of the sleeper.

[0003]

Among the conventional elastic mats on the bottom of the sleepers, there is one in which the elastic mat is not arranged in the central part of the sleepers in order to prevent the sleepers from sideways shifting. In that case, the crushed stones when the sleepers sink. The bottom of the center of the sleeper hits the gravel of the roadbed, and a bending moment with the center of the sleeper as a fulcrum is added to promote sleeper damage and quarry grain refinement. There was a problem. When another elastic mat is arranged on the bottom surface of the central part of the sleeper, the elastic mat at the central part and the elastic mats at both ends are not joined and are in a three-divided state. For this reason, many steps are required to attach the elastic mat to the sleeper, and the quarry enters the two mating portions of the elastic mat, which lowers the elastic function of the elastic mat and makes it easier for the elastic mat to peel off. There was a problem. Therefore, the present invention, in an elastic mat that elastically supports the sleeper, enables the sleeper to which the elastic mat is adhered to make it difficult to granulate the quarry and prevent the sleeper from being laterally shunted. The purpose is to improve.

[0004]

DISCLOSURE OF THE INVENTION The present invention has achieved the above object in a substantially band-shaped elastic mat which is arranged on the bottom surface of a track sleeper and elastically supports the sleeper. Therefore, the central part of the elastic mat is made thinner than both ends, and the central part of the elastic mat is made of an elastic material softer than both ends. The joint surface with the part was vulcanized. The central portion of the elastic mat is made of an elastic material having a JIS hardness of 50 to 75 degrees, and both ends thereof are made of an elastic material having a JIS hardness of 35 to 50 degrees.

[0005]

In the elastic mat on the bottom of the sleeper of the present invention, the central portion is formed thinner than the both ends, so that the stepped portion serves as a resistance to prevent the sleeper from sideways slipping, and the crushed stones under the sleeper form the center of the sleeper. It is possible to prevent the particles from hitting the bottom surface of the portion and being atomized. Furthermore, since the central portion of the elastic mat is formed of an elastic body that is softer than both ends, the elastic mat can prevent the spring constant from increasing due to the thin central portion. In addition, since the elastic mat has vulcanized joints between the central thin portion and the thick portions on both ends, crushed stones do not enter the joint surface, and the elastic function of the elastic mat is impaired or the elastic mat is There is no problem such as peeling.

[0006]

EXAMPLE An example of the present invention will be described with reference to FIG. On the track, sleepers 2 having an elastic mat 1 adhered to the bottom surface are arranged at regular intervals on the crushed stone roadbed 3, rails 4 are laid on each sleeper 2, and the vehicle travels on the rails 4 by the elastic mat 1. It is designed to reduce the vibration and noise at the time. The elastic mat 1 is formed in a substantially strip shape and adhered to the entire bottom surface of the sleeper 2, and the central portion 1a of the elastic mat 1 has both end portions 1b.
It is formed to be thinner (about 1/2 in this embodiment), and the central portion 1a is formed to be about 1/3 of the entire length of the elastic mat 1. The step between the central portion 1a and the both ends 1b increases the resistance force to prevent the sleepers 2 from laterally shifting.
The central portion 1a of the elastic mat is formed of a soft elastic body having a JIS hardness of 35 to 50 degrees, and both end portions 1b are formed of a hard elastic body having a JIS hardness of 50 to 75 degrees. The reason why the central portion 1a is formed of a soft elastic body is to prevent the spring constant from increasing due to its thinness.

When manufacturing the elastic mat 1, the central portion 1a and both end portions 1b are formed of an unvulcanized elastic material,
After temporarily joining the two, the temporarily joined portion is inserted so as to match the stepped portion of the mold, and the mold is further heated while being pressurized to cause a vulcanization reaction to be vulcanized. Simultaneously with this vulcanization treatment, the joint surface between the central portion 1a and both end portions 1b of the elastic mat is vulcanized and adhered to integrally and firmly join the whole.

In the above embodiment, the entire elastic mat is integrally formed, but the elastic mat may be divided into two parts at the central portion as shown in FIG. In this case, at the time of manufacture, the central portion 1a of the elastic mat 1 is formed in half and each is vulcanized and bonded to both end portions 1b. When the elastic mat 1 is divided into two parts in this way, one extra joint portion is generated. However, since the elastic mat 1 may be formed in half, the mold and the vulcanizing machine to be manufactured are halved. It can be downsized to some extent and can be manufactured economically.

[0009]

EFFECT OF THE INVENTION Since the central portion of the elastic mat of the sleeper bottom of the present invention is formed to be thinner than the both ends, the stepped portion serves as a resistance to prevent the sleeper from being laterally swayed, and the central bottom surface of the sleeper is It can prevent the crushed stones from becoming finer. Furthermore, since the central portion of the elastic mat is made of an elastic material that is softer than both ends, the elastic mat can prevent the spring constant from increasing due to the thin central portion. Further, the elastic mat has a joint surface between the central thin portion and the thick portions on both ends firmly joined by vulcanization joining, and crushed stones do not enter between the joined surfaces, impairing the elastic function of the elastic mat, There is no problem such as the elastic mat coming off.

[Brief description of drawings]

FIG. 1 is a front view and a side view of a state in which an elastic mat of the present invention is adhered to a sleeper.

FIG. 2 is a front view and a side view of a state in which an elastic mat manufactured in two parts is bonded to a sleeper.

FIG. 3 is a front view and a side view, respectively, showing a state in which three types of conventional elastic mats are bonded to a sleeper.

[Explanation of symbols]

 1 Elastic mat 1a Central part 1b End part 2 Sleepers

Claims (1)

[Claims] 1. A substantially band-shaped elastic mat which is disposed on the bottom surface of an orbital sleeper and elastically supports the sleeper, wherein the central part of the elastic mat is formed thinner than both ends, and the central part of the elastic mat is defined from both ends. An elastic mat on the bottom of a sleeper, which is formed of a soft elastic body, and the joint surface of the central thin portion and the thick portions on both ends of the elastic mat is vulcanized and joined together with the vulcanization of the elastic mat.