JPS63151701A - Track pad in rail clamping apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

(Conventional technology) In order to deal with track damage due to the recent increase in train speeds, increased vehicle weight, and increased transportation volume, concrete sleepers have been developed and rails have been elastically fastened. So-called elastic fastening devices have been developed and are now widely put into practical use.

One of the above-mentioned elastic fastening devices is a double elastic fastening device in which a track pad made of an elastic material such as rubber is interposed under the rail, and the track pad and a fastening spring elastically press the rail from one side. Yes.

The orbits P and D are the most important parts. That is,
By utilizing the buffering effect and vibration damping effect of its own elasticity, the track pad reduces dynamic vibration generated in the rail and transmission to the roadway, thereby reducing deterioration such as trackbed subsidence and flow. It also distributes the load of one train and reduces the load on one sleeper. Furthermore, it plays many roles such as improving the insulation between the rail and sleepers due to its electrical insulation properties.

Further, in order to enhance the vibration damping effect, the spring constant of the track 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 track pad.

(Problems to be Solved by the Invention) However, when the thickness of the track pad is increased, lateral shear deformation increases, so lateral pressure members such as fastening springs need to be strengthened.

In recent years, noise and vibration damage to railway lines 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 of the track pad. In addition, since the rail deflection caused by the lateral pressure applied to the rail from the wheels increases, it is necessary to take measures to control this. Therefore, a tie plate 2 is installed under the rail pad 1 as shown in Fig. 2. In addition, a rubber pad 3 for supporting the tie plate 2 is interposed therebelow, 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 track pad without lowering the spring constant of the track pad. The purpose is to

(Means for Solving the Problems) For this purpose, in the present invention, the track pad is made of a porous sintered plate-like body formed by pressurizing and sintering gray cast iron strips, and a non-conductive rubber plate. 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 for the track pad (for this porous sintered plate-like body, see Japanese Patent No. 1218991-Japanese Patent Publication No. 52528 of 1977) ) By using the track pad, vibrations and noise of the train on the rail can be reduced without increasing the thickness of the elastic material such as rubber of the track pad to reduce the spring constant. can be sufficiently absorbed.

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

13. Leaf spring 14. Embedded plug 15.
Washer 16. It is composed of a spring holder 17, a track pad 18, and the like.

The embedded plugs 15 are attached to 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 so as to open on the surface of 9. Further, the spring pedestal 17 is integrally formed with the concrete bridge 11 on both side edges of the fastening seat surface 19.

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 may be formed only from the porous sintered plate-like body 20;
Although it has sufficient compressive strength, it is brittle because it is a pressure-formed material.

It has problems such as being susceptible to scratches, being sensitive to moisture and humidity, and lacking insulation. To solve these problems, wrap the fastening surface 1 of the concrete sleeper 11 with a non-conductive elastic material 21 such as rubber or synthetic resin.
Place the track pad 18 on top of the track pad 18, and attach the rail 12 to the
, place the leaf spring 14 on the rail 12 and the spring holder 1
7 to position the rail 12 in the left and right direction. After that, the fastening port 13 is fitted into the leaf spring 14 via the bolt 17.

The rail 12 is fastened and fixed by screwing into the embedded plug 15.

(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 low spring constant, and there is no need to use tie plates or rubber pads, so the structure does not become complicated and maintenance management is easy. It is something.

[Brief explanation of the drawing]

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. a is a rail fastening device, 11 is a concrete sleeper, 1
2 is a rail, 18 is a track pad, 20 is a porous sintered plate, and 21 is an elastic material.

Claims (1)

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