JPH047761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rail fastening device for elastically fastening rails, a track pad used in a so-called elastic fastening device.

(Conventional technology) In recent years, in order to deal with track damage due to higher train speeds, increased vehicle weight, and increased transportation volume, concrete sleepers have been developed, as well as so-called elastic fastening devices that elastically fasten rails. It has progressed and is widely put into practical use.

Among the above-mentioned elastic fastening devices, in the double elastic fastening device, a track pad made of an elastic material such as rubber is interposed under the rail, and the rail is elastically pressed from above and below by the track pad and a fastening spring. The track pad is the most important part. That is, the track pad has a cushioning effect due to its own elasticity,
By utilizing the vibration damping effect, it reduces the transmission of dynamic vibrations generated in the rail to the sleeper and trackbed, reducing deterioration such as trackbed subsidence and flow. In addition, the load on a single sleeper is reduced by dispersing the load of the train. Furthermore, it plays many roles such as improving the insulation between the rail and sleepers due to its electrical insulation properties.

Furthermore, in order to enhance the vibration damping effect, the spring constant of the raceway pad can be lowered, but if the spring constant is lowered, the deterioration becomes severe due to an increase in strain. Conventionally, this problem has generally been addressed by increasing the thickness of the raceway pad.

(Problem to be solved by the invention) However, increasing the wall thickness of the track pad increases lateral shear deformation, making it necessary to strengthen lateral pressure members such as fastening springs. Noise and vibration damage has become a social problem, and the effective use of the vibration damping effect of track pads is attracting attention. It is necessary to change to one with a low spring constant that can follow the deformation. In addition, since the slight deflection of the rail caused by the lateral pressure applied to the rail from the wheels increases, it is necessary to take measures to control this. Therefore, as shown in FIG. In this method, a rubber pad 3 for supporting the tie plate 2 is interposed under the rubber pad 3, which results in a complicated and expensive structure, and requires time and effort for maintenance. 4 is a rail, 5 is a sleeper, 6 is a fastening bolt, and 7 is a screw nail.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and eliminates the above-mentioned conventional problems by increasing the vibration damping effect of the raceway pads without lowering the spring constant of the raceway pads. The purpose is to

(Means for Solving the Problems) For this purpose, in the present invention, the track pad is made of a porous crystal plate-like body formed by pressurizing and sintering gray cast iron strips, and a non-conductive material such as rubber. The elastic material is wrapped in an elastic material, and the elastic material and a porous sintered plate-like body are integrated.

(Function) A porous sintered plate-like body having particularly excellent sound-absorbing and vibration-absorbing properties is used as a track pad (for this porous sintered plate-like body, please refer to Patent No. 1218991-Japanese Patent Publication No. 58-52528).
Please refer to the publication No. ), the track pad can absorb the vibrations and noise of the train on the rail without increasing the thickness of the elastic material such as rubber on the track pad to reduce the spring constant. Can be absorbed sufficiently.

(Example) The present invention will be described below with reference to an illustrative example.

A is a rail fastening device that fastens the rail 12 to the concrete sleeper 11, which is a concrete support, and includes a fastening bolt 13, a leaf spring 14, an embedded plug 15, a washer 16, a spring cradle 17, a track pad 18, etc. It is configured.

The embedded plugs 15 are installed on both sides of a groove-shaped fastening seat surface 19 that is formed in advance in the rail fastening portion of the concrete sleeper 11 along the laying direction of the rail 12. It is embedded with an opening on the surface. Further, the spring cradle 17 has concrete sleepers 1 on both sides of the fastening seat surface 19.
It is integrally formed with 1.

The track pad 18 includes a porous sintered plate-like body 20 formed by pressurizing and sintering gray cast iron strips, which is wrapped in a non-conductive elastic material 21 such as rubber. A solid sintered plate-like body 20 is integrated.

Note that the track pad 18 is a porous sintered plate-like body 2.
Although it is conceivable to form the porous sintered plate-like body 20 by itself, the compressive strength is sufficient, but it is brittle because it is a pressure-formed material. Weak against friction. There are problems such as dislike of moisture and humidity and lack of insulation. All of these problems can be solved by wrapping it with a non-conductive elastic material 21 such as rubber or synthetic resin.

To fasten the rail 12 to the concrete sleeper 11 using the rail fastening device a, first, the track pad 18 is placed on the fastening seat surface 19 of the concrete sleeper 11, and the rail 12 is placed on it. Next, the leaf spring 14 is attached to the rail 12 and the spring holder 1.
7 to position the rail 12 in the left and right direction. After that, the fastening bolt 13 is inserted into the plate spring 14 via the nut 17, and the embedded plug 15 is inserted.
The rail 12 is fastened and fixed by screwing it.

(Effects of the present invention) As described above, according to the present invention, the track pad interposed between the fastening seat surface of the rail fastening part of the concrete support and the rail lower surface is pressurized with gray cast iron strips. The porous sintered plate-like body formed by sintering is wrapped in a non-conductive elastic material such as rubber, and the elastic material and the porous sintered plate-like body are integrated. It was possible to obtain a track pad with a high vibration damping effect without increasing the wall thickness of the track pad to lower the spring constant.

Therefore, there is no need to change the fastening spring to one with a lower spring constant, and there is no need to use tie plates or rubber pads, so the structure does not become complicated and maintenance is easy. It has the following.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing a rail fastening device according to the present invention, and FIG. 2 is a longitudinal sectional front view showing a conventional rail fastening device. 11 is a concrete sleeper, 12 is a rail, 18 is a track pad, 20 is a porous sintered plate, and 21 is an elastic material.

Claims (1)

[Claims] 1. In a rail fastening device that elastically fastens the rail by interposing a track pad between the rail fastening seat surface of a concrete support such as a concrete sleeper or slab track and the lower surface of the rail,
The track pad is a porous sintered plate-like body formed by pressurizing and sintering gray cast iron strips, which is wrapped in a non-conductive elastic material such as rubber, and the elastic material and the porous sintered plate are wrapped in a non-conductive elastic material such as rubber. A track pad in a rail fastening device, characterized in that it is configured by integrating a shaped body with a shaped body.