JP2511764Y2 - Leaf spring for PC fastening device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is to securely and securely fasten a rail to a concrete sleeper support on a railway track.
The present invention relates to a leaf spring for a PC fastening device. (However, "PC" in the present invention means "prestressed concrete"
Used in the sense of. Therefore, "PC fastening device" means "rail fastening device for prestressed concrete sleepers". [Conventional Technology] As shown in FIG. 5, a conventional rail fastening device for concrete sleepers has a rail 3, a leaf spring 4, and a fastening bolt 5 on a concrete sleeper support 1 via a track pad 2. And is fastened elastically by washers 6. The tip portion 4a of the lower spring that constitutes the leaf spring 4 is in close contact with the rail bottom upper surface 3a and the same side surface 3b, and the lower spring receives the lateral pressure due to the train load to directly act on the spring bottom curved portion. I am trying. Further, the holes for the fastening bolts 5 are bored so as to be elongated holes in consideration of the gauge adjustment amount.

[Problems that the device is trying to solve]

As described above, the system of FIG. 5 has a structure in which the lower spring receives the lateral pressure due to the train load and directly acts on the curved portion of the spring tail. The lateral spring constant of the leaf spring 4 is theoretically governed by the second moment of area, but the lateral spring constant is compared because the sectional modulus is selected from the maximum stress that occurs in the curved portion of the spring tail during the intended tightening. It becomes a very large value. For this reason,
Since the lateral pressure due to the train load acts on the bent portion of the spring tail without being almost dispersed, there is a possibility that other components supporting the bent portion of the spring tail are damaged. Also,
The hole for the fastening bolt 5 of the lower spring that affects the second moment of area or the section modulus is a long hole in consideration of the adjustment amount of the gauge. It is typically perforated within.

In addition, as in the method of FIG. 6, the leaf spring 4, the lateral presser spring
There are some fastening methods that use three different springs, 4x and circular spring 4y, to reduce the lateral spring constant, but this method has many components and the handling during construction is complicated, Material costs and construction costs increase.

[Means to solve the problem]

In order to eliminate this drawback, the present invention uses the tip 4a of the lower spring that constitutes the leaf spring 4, the rail bottom upper surface 3a and the same side surface.
Part of the center of the plate width of the portion that directly contacts 3b is formed so as to be continuously drilled with the long diameter side of the hole for the fastening bolt 5. In addition, the entire surface in the plate width direction excluding the perforated portion is in direct contact with the rail bottom upper surface 3a and the same side surface 3b, and the lower spring directly receives the lateral pressure due to the train load and acts on the spring tail curved portion. It is assumed that In this way, there are no cases where holes for directly contacting the lateral pressure, which are in close contact with the rail bottom surface 3a and the side surface 3b, are punched to reduce the lateral pressure and lateral spring constant and prevent damage to other components. .

The present invention comprises a concrete sleeper support 1 and a rail 3
To provide a leaf spring for a PC fastening device which is structured to elastically and firmly and securely fasten the rail to hold a stable rail pressing force and to directly receive the lateral pressure due to the train load to further enhance the cushioning effect. Is.

[Action]

The tip 4a of the lower spring that constitutes the leaf spring 4 for elastically fastening the rail has no gap at the contact portion with the rail bottom upper surface 3a and the same side surface 3b, and the plate width excluding the perforated portion is effectively used to directly Because of the close contact, the lower spring directly receives the lateral pressure from the train load and acts on the curved portion of the spring buttocks, increasing the rotation resistance between the concrete sleeper support 1 and the rail 3 and reducing the right angle deviation. Become. Moreover, a part of the vertical plate width center of the portion that comes into contact with the rail bottom side surface 3b that directly receives the lateral pressure of the lower spring is bored, so that the second moment of area is reduced and the lateral spring constant is reduced. The lateral pressure at the part is dispersed, and the lateral pressure acting on the curved portion of the spring tail is reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIGS. 1, 2, 3, and 4 are the embodiments described in the claims.

FIG. 1 shows an existing state of one of the leaf springs 4 on one rail 3 of the railroad track before fastening. The tip 4a of the lower spring constituting the leaf spring 4 is shaped so as to easily come into contact with the rail bottom upper surface 3a and the same side surface 3b, and as shown in the AA sectional view,
At a portion that directly contacts the rail bottom upper surface 3a and the same side surface 3b,
A part of the center of the plate width is formed so as to be continuously drilled with the long diameter side of the hole for the fastening bolt 5. Further, the spring tail curved portion of the leaf spring 4 is provided with a curvature such that the entire surface is in contact with other constituent members that support it.

FIG. 2 shows a state in which the leaf spring 4 in the state of FIG. 1 is fastened by the fastening bolt 5 and the washer 6 under a predetermined tightening condition. The upper spring contacts both the lower spring tip 4a and the rail bottom top surface 3a, or the lower spring tip 4a
Make sure to contact 4a. The leaf spring 4 elastically fastens the rail 3 to the concrete sleeper support 1 via the track pad 2.

The lateral pressure due to the train load is directly received by the tip end portion 4a of the lower spring and acts on the spring tail curved portion. The tip 4a of the lower spring is in close contact with the rail bottom upper surface 3a and the same side surface 3b without any gap at the contact portion, and the spring tail curved portion is also in full contact with other constituent members supporting it. Therefore, the rolling resistance between the rail 3 and the concrete sleeper support 1 with respect to the train load increases. Moreover, the tip end 4a of the lower spring is a portion that comes into contact with the side surface 3b of the rail bottom, and the partial pressure at the center of the plate width in the vertical direction is drilled to distribute the lateral pressure at that portion, which acts on the curved portion of the spring tail. Lateral pressure is reduced.

FIGS. 3 and 4 show a fastening device for one set of one side rail 3 of a railroad track and an embodiment of the present invention with respect to the fastening state thereof, in which a concrete sleeper support 1 is provided with a track pad 2 interposed therebetween. The rail 3 is elastically fastened to the leaf spring 4 by the fastening bolt 5 and the washer 6. The leaf spring 4 acts as an elastic resistance force against the repeated load from the train and the rail axial force acting in the longitudinal direction of the rail 3.

[Effect of device]

If the leaf spring for the PC fastening device according to the present invention is used in a railroad track, the rail 6 is fixed to the concrete sleeper support 1
It can be securely and firmly fastened. Moreover,
The tip end portion 4a of the lower spring that constitutes the leaf spring 4 has its both ends, except for the perforated portion at the center of the leaf width, directly contacting the rail bottom upper surface 3a and the same side surface 3b without a gap at the contact portion, and the leaf spring 4 has a width of Since it is used effectively, the rolling resistance between the rail 3 and the concrete sleeper support 1 is increased, and the right angle deviation is small, which greatly contributes to the stability of the track.

In addition, since a part of the vertical plate width center at the tip end portion 4a of the lower spring is continuously bored with the long diameter side of the hole for the fastening bolt 5, the lateral spring constant is reduced and the lateral pressure at the same portion is reduced. Are dispersed. For this reason, the lateral pressure acting on the curved portion of the spring tail is reduced, and the leaf spring for the PC fastening device can withstand a relatively large lateral pressure generated by the train load.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a leaf spring according to the present invention is present on one side rail before fastening, and FIG. 2 is also fastening a leaf spring for a PC fastening device according to the present invention on one side rail. It is a front view when doing. 3 and 4 are a plan view and a front view of a leaf spring for a PC fastening device according to the present invention when the leaf spring is fastened. 5 and 6 are front views of a conventional elastic fastening device used for a concrete sleeper support, FIG. 5 shows a double spring type, and FIG. 6 shows three different types. FIG. 7 is a view of an elastic fastening device of the type configured with the spring of FIG. 1 ... Concrete sleeper support, 2 ... Track pad, 3 ... Rail, 3a ... Rail bottom upper surface, 3b ... Rail bottom side surface, 4 ... Leaf spring, 4a ... Lower spring tip, 4x
...... Side presser spring, 4y ...... Circular spring, 5 ...... Fastening bolt,
6 ... Washer.

Front page continuation (72) Shigeru Hayashi 19 19 Mamitsuka, Asoda-cho, Toyokawa-shi, Aichi Prefecture 2 (72) Inventor Tsuneo Ukai 289 Examiner, Ryoji Kawashima, 74, Owaki-noya, Owaki-cho, Toyohashi-shi, Aichi Prefecture

Claims (1)

(57) [Scope of utility model registration request] 1. A leaf spring for elastic rail fastening used in a concrete sleeper support, wherein a portion of the leaf spring center portion of the leaf spring which is in direct contact with the rail top surface and the side surface is used for fastening bolts. A leaf spring for a PC fastening device, characterized in that it is continuously drilled on the long diameter side of the hole.