JP2000345501A - Rail fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rail fastening device whose screws are not easily slackened by train traveling, promoting work efficiency, maintaining pull-out resistance over long period of time and facilitating the manufacturing and supply of bolts. SOLUTION: A rail 3 are mounted on a rail bearing member 4 such as a sleeper or the like through a track pat 5, rail holding members 6 are arranged between both ends of the base of the rail 3 and the rail bearing member 4, hexagon headed bolts 2 are inserted in embedded pins buried in the rail bearing member 4 from bolt through- holes of the rail holding members 6 to screw them into screw sections provided to the inside circumferential surfaces of the embedded pins, in a rail fastening device for fastening the rail 3 on the rail bearing member 4, the upper parts 1b of the embedded pins 1 are formed in the shape of a thin cylinder, the lower parts 1c are formed in the shape of a thick cylinder having an outside diameter larger than that of the upper parts, oval projections 1d are provided on the circumferential surfaces of the lower parts 1c, at the same time, each of the embedded pins 1 is constituted of thermoplastic polymer reinforced by glass fiber and inorganic filler, and meter coarse threads 1a and 2a are provided respectively to the inside circumferential surfaces of lower parts of the embedded pins 1 and the circumferential surfaces of the lower ends of the hexagon headed bolts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail fastening device for fastening a rail on a rail support member (sleeper or concrete slab).

[0002]

2. Description of the Related Art A conventional rail fastening device will be described with reference to FIG. 7. A rail pressing clip which supports a rail 03 on a rail support member 04 via a track pad 05 and is supported by a spring support 08 on the rail support member 04. 06 is placed on the base end of the rail 03, and the hexagon bolt 02 is
7 and the rail holding clip 06 are inserted into the embedding plug 01 embedded in the rail support member 04 from the bolt through hole, and the hexagonal bolt 02 is screwed into a screw portion provided on the inner peripheral surface of the embedding plug 01. The rail 03 is fastened on the rail support member 04.

FIGS. 8 to 10 show details of the embedding plug 01. FIG. In order to maintain insulation, the plug 01 is made of plastic, and in order to maintain the strength of the screw, a trapezoidal shape with a large screw pitch p and a large difference between the root diameter and the peak diameter from the lower part to the upper part of the inner peripheral surface. In order to prevent the rotation of the embedding plug 01 and obtain a pull-out resistance, the screw 01a is provided with an oval projection 01d in multiple stages from the lower part to the upper part of the outer peripheral surface. 01b is the upper part of the plug, and 01c is the lower part of the plug.

FIGS. 11 and 12 show the hexagonal bolt 02 in detail. The trapezoidal screw 02a extends from the lower part to the upper part of the outer peripheral surface corresponding to the trapezoidal screw 01a of the embedding plug 01.
Is provided. 02b is a bolt head, and 02c is a bolt shaft.

[0005]

The screws provided on the inner peripheral surface of the plug 01 and the outer peripheral surface of the hexagonal bolt 02 are trapezoidal screws, and the lead angle β of the screw is large and the half angle α of the screw is also large. In addition, the screws are easily loosened due to the running of the train, and it is necessary to frequently perform maintenance work such as inspection and retightening, resulting in poor workability.

[0006] Further, in order to secure an effective number of threads in the embedding plug 01 under the constraint of the sleeper thickness, the trapezoidal screw 01a of the embedding plug 02 and the trapezoidal screw 02 of the hexagonal bolt 02 are required.
a must be formed from the lower part to the upper part. Therefore, when a concentrated load is applied to the upper part of the screw of the embedding plug 01 due to tolerance of each part or the like, a crack is easily generated on the upper surface of the concrete slab around the upper part of the embedding plug 01, and the pull-out resistance decreases early.

The hexagonal bolt 02 has a trapezoidal screw 02a having a large screw pitch p and a large difference between the root diameter and the peak diameter on the outer peripheral surface corresponding to the screw shape of the embedding plug 01. Cannot be manufactured by ordinary cold heading, but is manufactured by hot forging, and manufacture and procurement are not easy.

Although the bolt strength is governed by the minimum cross-sectional area of the valley, the bolt cross-section is A (423 mm ² ), B (206 mm ² ), and B / A = 0.48. Low proof stress. There was a problem.

The present invention has been made in view of the above problems, and has as its object to eliminate the need for frequent maintenance work such as inspection and retightening because the screws are not easily loosened by running the train. To provide a rail fastening device capable of improving workability, maintaining the pull-out resistance for a long period of time, obtaining a strong pull-out resistance, facilitating the production and procurement of bolts, and improving the bolt resistance. It is in.

[0010] In order to achieve the above object, the present invention provides:
A rail is placed on a rail support member such as a sleeper via a track pad, a rail holding member is arranged between both ends of the base of the rail and the rail support member, and a hexagon bolt is used for the rail holding member. A rail for fastening the rail on the rail support member by inserting the bolt from the bolt through hole into an embedding plug embedded in the rail support member and screwing it into a screw portion provided on the inner peripheral surface of the embedding plug In the fastening device, the upper part of the embedding plug is formed in a thin-walled cylindrical shape, and the lower part is formed in a thick-walled cylindrical shape having an outer diameter larger than that of the upper part. The spigot is made of glass fiber, a thermoplastic polymer reinforced with inorganic filler,
A metric coarse screw is provided on a lower inner peripheral surface of the buried plug and a lower outer peripheral surface of the hexagonal bolt.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Next, a rail fastening device according to the present invention will be described with reference to a first embodiment shown in FIGS. 1 to 5. FIG. 1 to FIG. Upper part 1 of the plug 1
b is formed into a thin cylindrical shape, the lower portion 1c is formed into a thick cylindrical shape having an outer diameter larger than that of the upper portion 1b, and an elliptical protrusion 1d is provided on the outer peripheral surface of the lower portion. ,
It is composed of a thermoplastic polymer reinforced with an inorganic filler. The upper part 1b only has to serve to prevent the inflow of concrete when the pillow is made, and has a thin cylindrical shape. The lower part 1c is formed in a thick cylindrical shape having a large cylindrical cross-sectional area in order to maintain strength. An oblong projection 1d is provided on the outer peripheral surface of the lower part 1c in order to prevent the insertion plug 1 from rotating. With the above configuration, the entire embedding plug 1 is enlarged toward the lower portion, and a strong pull-out resistance is obtained.

A metric coarse thread 1a (coarse with metric thread, JISB) is provided on the inner peripheral surface of the lower part 1c of the plug.
0205). Same meter coarse thread 1a
The screw pitch p and the difference between the root diameter and the peak diameter are smaller than those of the trapezoidal screw.

1, 2, and 5 are hexagonal bolts, and a metric coarse screw 2a is provided on the lower outer peripheral surface corresponding to the metric coarse screw 1a of the embedding plug 1. A standard bolt (see JIS 1180) can be used for the hexagon bolt 2. 5 is a bolt head, and 2c is a bolt shaft. 1 and 2, 3 is a rail, 4 is a rail support member (sleeper or concrete slab), 5 is a track pad, 6 is a rail presser, and 7 is a leaf spring.

Next, the operation of the rail fastening device of the present invention will be described. (1) In the screw connection, the smaller the loosening torque, the easier the loosening. The loosening torque is expressed by the following equation.

[0015]

T ₁ = 1/2 F ₁ ｛α _p tan (ρ′−β)
+ D _w・ U _w ｝

Where T ₁ = loosening torque F ₁ = tightening axial force ρ '= friction angle of the screw (tanρ' = Us / Cosα) β = lead angle of the screw (tan β = p / πd _p ) α _p = screw friction coefficient of the friction coefficient U _w = the seating surface of the half angle Us = threaded portion in the radial p = thread pitch alpha = thread effective diameter d _w = seat surface

When the bolt diameter and the friction coefficient of each part are the same, in order to increase the loosening torque, it is necessary to increase the screw friction angle ρ 'and reduce the screw lead angle β. That is, it is necessary to reduce the half angle α of the screw and the screw pitch p. In this regard, the conventional plug and hexagon bolt are different from the plug and hexagon bolt of the present invention in the following points. That is, conventionally, trapezoidal screws 01a and 02a are provided on the inner peripheral surface of the embedding plug 01 and the outer peripheral surface of the hexagonal bolt 02, and the lead angle β of the screw is large and the half angle α of the screw is also large. Is easy to loosen, and it is necessary to frequently perform maintenance work such as inspection and retightening, resulting in poor workability.

On the other hand, according to the present invention, the plug 1 is made of a thermoplastic polymer reinforced with glass fiber and an inorganic filler, and the screw portion is reinforced, so that the metric coarse screw 1a can be formed. I have. The metric coarse screw 1a has a small lead angle β of the screw and a half angle α of the screw.
Is small, so screw loosening hardly occurs due to train running,
The frequency of maintenance work such as inspection and retightening is reduced, and workability is improved.

(2) The pull-out resistance of the plug (anchor) is governed by the screw strength of the plug, the shear strength of the plug cylindrical part, and the concrete strength around the plug. The shear strength of the embedding cylinder is determined by the cross-sectional area,
The concrete strength at the outer periphery of the plug is generally expressed by the following equation (see FIG. 13).

[0020]

P = α × Ac × σ _ch (Architectural Institute of Japan Structural Design Guideline)

Here, P = concrete strength Ac = effective projected area at the time of cone-shaped fracture (π (L + d /
2) ² ) σ _ch = reference design strength of concrete (3) The conventional buried plug differs from the buried plug of the present invention also in terms of pull-out resistance. That is,

In the conventional plug 01, if the number of effective threads is to be secured under the restriction of the thickness of the sleeper,
The trapezoidal screw 01a of the embedding plug 02 and the trapezoidal screw 02a of the hexagonal bolt 02 must be formed from the lower part to the upper part. Therefore, when a concentrated load is applied to the upper part of the screw of the embedding plug 01 due to tolerance of each part or the like, a crack is easily generated on the upper surface of the concrete slab around the upper part of the embedding plug 01, and the pull-out resistance decreases early.

On the other hand, according to the present invention, the screws of the plug 1 and the hexagonal bolt 2 are metric coarse screws 1a and 2a, and the screw pitch p is small. Even if it is limited to the peripheral surface and the lower peripheral surface of the hexagonal bolt 2, the number of effective threads can be ensured, and there is no need to provide a screw on the top of the embedding plug 1 and the hexagonal bolt 2. Therefore, even when a concentrated load acts on the upper part of the plug 1 due to tolerances of the respective parts, cracks are less likely to be generated on the upper surface of the concrete slab around the upper part of the plug, and the pull-out resistance is maintained for a long time. . In the conventional buried plugs and hexagon bolts as well, if metric coarse screws are provided on the lower inner peripheral surface of the buried plug and the lower outer peripheral surface of the hexagon bolts, the loosening of the screws is prevented, and the pull-out resistance is maintained. It is valid.

Further, in addition to the above points, the present invention forms the upper portion 1b of the plug 1 in a thin cylindrical shape and the lower portion 1c in a thick cylindrical shape having a larger outer diameter than the upper portion 1b. The surface is provided with an elliptical projection 1d, and the whole shape is enlarged toward the lower portion, so that a strong pull-out resistance can be obtained.

(4) The conventional hexagon bolt differs from the hexagon bolt of the present invention in the following points. That is, in the conventional hexagonal bolt 02, a trapezoidal screw 02a having a large thread pitch p and a large difference between the root diameter and the peak diameter is formed on the outer peripheral surface corresponding to the screw shape of the embedding plug 01. The bolt 02 cannot be manufactured by ordinary cold heading, but is manufactured by hot forging, and manufacturing and procurement are not easy. Although the bolt strength is governed by the minimum cross-sectional area of the valley, the axial cross-sectional area A
(423 mm ² ), trough diameter cross-sectional area B (206 mm ² ), B
/A=0.48, low bolt strength.

On the other hand, the hexagonal bolt 2 of the present invention has a metric coarse thread 2a on the outer peripheral surface, and a standard bolt (see JIS1180) can be used. Since the bolt can be manufactured by cold heading, the manufacture and procurement of the bolt are facilitated. Also, a metric coarse thread 2a having a large valley diameter cross section is provided on the lower outer peripheral surface of the hexagonal bolt 2, and the valley diameter cross sectional area is large, so that the bolt strength is improved.

(Second Embodiment) The rail fastening device of the present invention can be applied to a rail fastening device other than the above embodiment. For example, as shown in FIG. 6, the rail retainer 6 of FIG. 1 is replaced with a rail retainer clip 6 ', the leaf spring 7 is replaced with a washer 7', and a spring support is provided between the rail retainer clip 6 'and the rail support member 4. The present invention can also be applied to a rail fastening device with the base 8 interposed. In FIG. 6, 1 is an embedding plug, 1b is an upper part thereof, 1c is a lower part thereof, 1d is an oblong projection, 2 is a hexagonal bolt, 3 is a rail, and 5 is a track pad.

[0028]

According to the present invention, the plug is made of a thermoplastic polymer reinforced with glass fiber and an inorganic filler, and the thread portion is reinforced so that a metric coarse thread can be formed. The metric coarse screw has a small screw lead angle β and a small half angle α of the screw, so it is difficult for the screw to loosen due to running of the train, and there is no need to frequently perform maintenance work such as inspection and retightening. Performance can be improved.

Further, in the present invention, since the screw of the plug and the hexagonal bolt are metric coarse screws and the screw pitch p is small, the setting area of the screw is limited to the lower inner peripheral surface of the plug and the lower outer periphery of the hexagonal bolt. Even if it is limited to the surface, the number of effective threads can be secured, and there is no need to provide a screw above the embedding plug and the hexagonal bolt. Therefore, even if a concentrated load acts on the upper part of the plug due to tolerances of the respective parts, cracks are unlikely to occur on the upper surface of the concrete slab around the upper part of the plug, and the pull-out resistance can be maintained for a long time. In addition, the upper part of the embedding plug is formed in a thin cylindrical shape, and the lower part is formed in a thick cylindrical shape having a larger outer diameter than the upper part, and an oblong projection is provided on the lower outer peripheral surface, and Since the whole shape is enlarged toward the lower part, a strong pull-out resistance can be obtained.

Further, according to the present invention, a hexagonal bolt is provided with a metric coarse thread on the outer peripheral surface thereof, and a standard bolt (JIS 1180) is used.
Reference) can be used. Since this bolt can be manufactured by cold heading, it is easy to manufacture and procure the bolt.

Further, according to the present invention, the screw provided on the outer peripheral surface of the lower part of the hexagonal bolt is a metric coarse thread having a large root diameter cross-sectional area, and the bolt strength can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of a rail fastening device of the present invention, and the right half is a longitudinal sectional front view thereof.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view showing an embedding plug of the rail fastening device.

FIG. 4 is a vertical sectional front view of FIG. 3;

FIG. 5 is a front view showing a hexagon bolt of the rail fastening device.

FIG. 6 is a front view showing a second embodiment of the rail fastening device of the present invention, and the right half is a longitudinal sectional front view thereof.

FIG. 7 is a front view showing a conventional rail fastening device.

FIG. 8 is a plan view showing a conventional embedding plug.

FIG. 9 is a vertical sectional front view of the embedding plug, and a right half is a front view.

FIG. 10 is a vertical sectional front view showing a screw portion of the embedding plug in an enlarged manner.

FIG. 11 is a front view showing a conventional hexagon bolt.

FIG. 12 is an enlarged vertical sectional front view of a portion A in FIG. 11;

FIG. 13 is an explanatory view of concrete strength at the outer peripheral portion of the embedding plug.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Embedding plug 1a Metric coarse screw of embedding plug 1 1b Upper part of embedding plug 1 1c Lower part of embedding plug 1 1d Oval projection 2 Hexagon bolt 2a Hexagon bolt 2 Metric coarse screw 2b Hexagon bolt 2 2c Hexagonal bolt 2 shaft 3 Rail 4 Rail support member (sleeper or concrete slab) 5 Track pad 6 Rail presser (rail presser) 7 Leaf spring

Claims (1)

[Claims] 1. A rail is mounted on a rail support member such as a sleeper via a track pad, and a rail holding member is disposed between both ends of a base of the rail and the rail support member. The rail is inserted into the embedding plug embedded in the rail support member from the bolt through hole of the rail holding member, and screwed into a screw portion provided on the inner peripheral surface of the embedding plug, thereby connecting the rail to the rail support member. In the rail fastening device to be fastened on the upper part, the upper part of the embedding plug is formed in a thin cylindrical shape, the lower part is formed in a thick cylindrical shape having a larger outer diameter than the upper part, and an oval projection is formed on the lower outer peripheral surface. The embedding plug is made of glass fiber, a thermoplastic polymer reinforced with an inorganic filler, and a metric coarse thread is provided on the lower inner peripheral surface of the embedding plug and the lower outer peripheral surface of the hexagonal bolt. Characteristic rail fastening equipment Place.