JPH0452241Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an elastic sleeper with a trackbed that not only has general vibration-proofing and sound-proofing effects, but also prevents wear of crushed stone on the trackbed and enhances the durability of the elastic material against track maintenance work.

As one method for reducing wheel load fluctuations, vibrations, and noise on railway tracks, elastic sleepers are used, in which the portion of concrete sleepers in contact with the track bed is covered with an elastic material.

However, conventional bedded elastic sleepers are made of concrete sleepers with a regular rectangular cross section and a thickness of 15 to 25 mm.
Since the structure is covered with elastic material of 1.5 mm in diameter, a large amount of expensive elastic material is required to cover the entire area, and the exposed part on the top of the concrete sleeper is easily damaged during track maintenance work. Ta. In addition, if the covering is stopped midway, it is inevitable that a step will occur at the end of the elastic material, and as the sleeper moves up and down when a train passes, the crushed stones of the roadbed diagonally above the step will be removed. This resulted in friction and wear, which caused the quality of the track bed to deteriorate. Furthermore, during track bed compaction, which is essential for track maintenance work, the tip of the working machine often impacts these elastic covering materials, causing damage to the elastic materials.

The following elastic sleeper with a track bed was devised to solve these problems.

The elastic sleeper with track bed according to the present invention will be explained according to the drawings. Figure 1 is an overall view of the elastic sleeper with a track bed. Figure 2 shows a concrete sleeper 1 having notches 3 on the lower side and end faces of the concrete sleeper, and as shown in the cross-sectional view in Figure 3, it is made of polyurethane, liquid polyptadiene, and liquid chloroprene synthetic resins. In addition, the material is synthetic rubber latex, etc., and if necessary, fillers such as rubber powder recycled from waste tires, foamed plastic particles, calcined minerals, and artificial aggregate are mixed in to reduce the cost, and to ensure elasticity. It is completed by covering the foamed elastic material 2.

In the elastic sleeper with track bed of the present invention, the uncovered portion of the side surface of the concrete sleeper is formed to stand upright as much as possible to the extent that it does not interfere with demolding from the formwork.
A notch 3 is provided on the side and end face of the lower part of the concrete sleeper, and this part is vertically covered, and the bottom of the concrete sleeper is covered horizontally with the elastic material 2 in a box-like manner. The surface of the end face is formed smoothly by removing steps, which prevents abrasion of the trackbed crushed stones and avoids damage during track maintenance work.

In addition, the notches 3 at the bottom of the side and end faces of the concrete sleeper 1 are provided to ensure the adhesion of the box-shaped elastic material 2 to the concrete sleeper 1, and the height thereof is 2 to 10 cm. The depth of the notch may be 5 to 20 mm, more preferably 10 to 15 mm. In addition, the thickness of the bottom needs to be thick in order to ensure sufficient elasticity without damaging the track bed, and from an economic point of view it is desirable to make it thinner. Preferably 10~
It is appropriate to set it to 20mm.

Regarding the spring modulus of the elastic material 2, it is desirable to have a small spring coefficient from the point of view of ensuring elasticity, but a large one is desirable from the point of view of roadbed compaction, and it is 20 to 1000 KN/cm, more preferably 50 KN/cm for a 10 x 10 x 2.5 cm specimen. ~
It should be 200KN/cm.

With this sleeper, the notch is 10 mm, and the elastic material at the bottom is 2
The thickness of is 20mm, and the spring modulus of elastic material 2 is 90KN/cm.
As a result of making a prototype and conducting repeated impact loading tests, it was confirmed that it achieved the intended purpose.

[Brief explanation of the drawing]

Figure 1 is an overall view of the elastic sleeper with a track bed, Figure 2 is an overall view of the concrete sleeper with the elastic covering material removed, and Figure 3 is a sectional view of the elastic sleeper with a track bed. 1... Concrete sleeper, 2... Elastic material,
3...Notch part.

Claims (1)

[Scope of utility model registration request] A notch of a certain depth is provided at the bottom of the side and end faces of the concrete sleeper, and this notch is made of a box-shaped elastic material having the required thickness at the bottom, which is flush with the side and end faces of the concrete sleeper. 1. An elastic sleeper with a track bed, characterized in that the elastic covering material is coated so that no step is formed between the elastic covering material and the side and end surfaces of the concrete sleeper.