WO2003012204A1

WO2003012204A1 - Rail vibration isolator

Info

Publication number: WO2003012204A1
Application number: PCT/KR2002/001418
Authority: WO
Inventors: Tae Woong Choi
Original assignee: Tae Woong Choi
Priority date: 2001-07-28
Filing date: 2002-07-26
Publication date: 2003-02-13
Also published as: KR20030011000A; KR100397870B1

Abstract

The present invention relates to a rail vibration isolator for improving efficiency of vibration isolation, laying the rail conveniently, carrying out simple replacement +of functionally disordered or abnormal parts, reducing cost for maintenance. The rail vibration isolator according to the present invention comprises: a rail coupling plate (2) provided at each side thereof with an upper packing insert hole (2a), a hooking protrusion (2i) for a central washer (6), a vibration isolating pad projection insert hole (2c), a spring clip coupling bolt hole (2b), a clip slip preventing protrusion (2e), a rail placing bottom (2d), rail slip preventing protrusion (2f), a rail pad slip preventing protrusion (2g), and a spring clip rotation preventing protrusion (2h), the lower inside part of said rail coupling plate (2) being thin and the edge of said rail coupling plate (2) being projected; a thick vibration isolating pad (1) having a stay anchor insert hole (la) drilled on each side thereof; an upper packing (7) having a stay anchor insert hole (7b) drilled in the central portion thereof; a pressing washer (10) for pressing said upper packing (7); and a washer and a nut (9) for fastening a spring clip (11). The rail vibration isolator is assembled by the steps of: fixing the stay anchor to the concrete roadbed; putting the supporting plate (8), the vibration isolating pad (1) and the rail coupling plate (2) on the stay anchor; putting the central washer (6), the upper packing (7), and the pressing washer (10) on the stay anchor; fastening the central washer (6), the upper packing (7), and the pressing washer (10) using the nut (5); laying the rail pad (3) and the rail; placing the spring clip (11) on the rail flange (13a); putting the washer thereon; and fastening the piled parts together using the bolt (9).

Description

RAIL VIBRATION ISOLATOR

TECHNICAL FIELD

The present invention relates generally to a rail vibration isolator for protecting a train, relevant facilities on a rail concrete roadbed, and buildings near a railroad from vibration and shock generated when the trail runs on the rail, thereby running quietness of the train being increased and feeling of taking the train being improved.

BACKGROUND ART In the subway, it is a general tendency that a gravel roadbed is replaced by a concrete roadbed for the purpose of convenience of the maintenance and isolation of the environmental pollution.

In a underground railway in a city, a rail is laid on the concrete roadbed. Consequently, the effect of vibration isolation is satisfactory less than the conventional gravel roadbed. For this reason, noise generated between the running wheel of the train and the rail of the underground railway may be more than a standard value. As a result, passengers may have difficulty in talking with each other, the use of the wireless telephone may be inconvenient, and the relevant iacilities such as the structures, the train, and rail, and the neighboring buildings may be affected adversely. A rail vibration isolator according to the prior art laid on a railway bridge, subway, or the like is shown in Fig. 1. As shown in Fig. 1, a thin support plate B is laid on a concrete roadbed, a rail coupling unit C is laid on the thin support plate, a stay anchor bolt D is fixed to the concrete roadbed A, a packing E and a spring washer F are inserted and then Hastened by a nut G, a spring clip H is arranged on the side of the rail, which is fastened by a bolt I so as to stabilize the rail. When the train is passed, the primary shock is absorbed by a rail pad J_> and vibration isolation is accomplished by a vibration isolating pad K. With the rail vibration isolator according to the prior art, however, the cost for manufacturing the same is very high. Since all the rail vibration isolator is covered by rubber so as to insulate the isolator, it is very difficult to find out any abnormal condition of the rail vibration isolator. Furthermore, the cost and time incurred for replacement of the rail vibration isolator are required too much since the rail vibration isolator must be replaced as a whole.

DISCLOSURE OF THE INVENTION

Accordingly, it is an object of the present invention to provide a rail vibration isolator wherein efficiency of vibration isolation is improved, replacement of a vibration isolating pad is simple, maintenance of the railroad line is convenient, thereby it is helpful to a safety operation.

In order to accomplish the aforesaid object of the present invention, there is provided a rail vibration isolator comprising: a support plate having an anchor hole for a stay anchor drilled at the right and left sides of the rail; a thick vibration isolating pad having an anchor hole for a stay anchor, said anchor hole of said thick vibration isolating pad corresponding to said anchor hole of said support plate; a rail coupling plate including an upward projecting anchor tube having an upper packing insert hole drilled, use of said upper packing insert hole being the same as that of said anchor holes, and having a bolt hole for fixing a spring clip; a stay anchor stuck in the concrete roadbed through said support plate, said vibration isolating pad, and said upper packing of said rail coupling plate; and a nut engaged with an outer screw provided at the upper end of said stay anchor.

With a rail vibration isolator according to the present invention, disassembly and replacement of the rail vibration isolator are simple since the vibration isolating pad and the packing are separated from each other, and a linear adjustment of the rail vibration isolator can be made up to +/- 5 mm on both sides since the position of the holes of the anchor hole of the vibration isolating pad and the upper packing can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

The preferred embodiment of the present invention will hereinafter be described in conjunction with the accompanying drawings in which:

Fig. 1 is a sectional view and a plan view of a rail raid using a rail vibration isolator according to the prior art;

Fig. 2 is a plan view and a sectional view of a rail raid using a rail vibration isolator according to the present invention;

Fig. 3 is a plan view of Fig. 2, a sectional view taken along the line B-B, and a sectional view taken along the line C-C; Fig. 4 is a perspective view of a rail coupling plate and a perspective view of a rail pad;

Fig. 5 is a perspective view of au upper packing and a perspective view of an adjustable upper packing; and

Fig. 6 is a perspective view of a vibration isolating pad and a perspective view of an adjustable vibration isolating pad.

BEST MODE FOR CARRYING OUT THE INVENTION

A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. As shown in Fig. 2, a rail vibration isolator comprises a vibration isolating pad 1, a rail coupling plate 2, a rail pad 3, a stay anchor 4, a nut 5, an upper packing 6, a pressing washer 10, a spring clip 11, and a bolt 9.

The rail coupling plate 2 is inserted between a concrete roadbed and a rail The vibration isolating pad 1 is arranged beneath the rail coupling plate 2, so that it can carry out the function of the secondary vibration isolation to the rail. The vibration isolating pad 1 is rectangular in a manner that the width between the front and the rear is longer than that between the right and the left, and made of thick rubber or urethane of low elasticity. The vibration isolating pad 1 is provided at projecting portions at both sides thereof with a drilled anchor hole la into which the stay anchor 4 is inserted.

The rail coupling plate 2 is provided for supporting substantially the laid rail. The rail coupling plate 2 is made of metal or plastic with high degree of strength, which is the same as the vibration isolating pad 1 in its shape and the plain area of the rail coupling plate 2 is about as large as that of the vibration isolating pad. And a projecting insert hole 2c, into which the projecting portion lb of the vibration isolating pad 1 is inserted, is provided at the position corresponding to that of the anchor hole la of the vibration isolating pad 1, for fixing the vibration isolating pad 1. The rail coupling plate 1 has a flanged lower circumferential edges such that the lower circumferential edges are thicker than the inner part, to prevent any slip of the vibration isolating pad 1 and increase the stocking force of the rail coupling plate 1.

The rail pad 3 is provided for accomplishing the function of the primary vibration isolation, which is made of rubber or urethane with low elasticity. The rail pad 3 is formed such that it has a dimension fitted to a rail pad seat 2d of the rail coupling plate 2. The rail pad 3 is provided at the front and the rear thereof with slip preventing protrusions, which are engaged with the rail pad slip preventing protrusions 2g of the rail coupling plate 2,

The stay anchor 4 is provided for stabilizing the supporting plate 8, the vibration isolating pad 1, and the rail coupling plate 2 under the condition that each of the anchor holes 8a, la and 7b is inserted into them while the stay anchor is inserted fixedly into the concrete roadbed, moreover, the stay anchor 4 acts as a guide rod for guiding smoothly the vertical movement like a piston when the rail pad 3, the rail coupling plate 2 and the vibration isolating pad 1 , all of which are subject to the dynamic load so that they go down by 1 mm - 2 mm as the train passes on the rail or when they are returned to the original states as the dynamic load of the train disappears. The stay anchor 4 is provided at the upper end thereof with an outer screw

4a, which is engaged into the nut 5. The stay anchor 4 is provided at the lower end thereof with a anchoring portion 4b, which is inserted into the anchor hole drilled vertically in the concrete roadbed in case that the stay anchor is provided at the existing rail in use. Between the anchoring portion 4b and the anchor hole is filled a strong adhesive agent.

In case that new construction is carried out, the vibration isolator is provided on the rail and the spring clip 11 is attached. After linear and height adjustment is carried out, the construction is finished by a concrete top down method.

The nut 5 presses the pressing washer 10, the upper packing 7, the rail coupling plate 2, the vibration isolating pad 1 and the supporting plate 8 by the engagement with the outer screw 4a provided at the upper end of the stay anchor 4, to prevent any shake of the vibration isolator.

When the stay anchor 4 is inserted fixedly into the concrete roadbed, on which the supporting plate 8, the vibration isolating pad 1, and the rail supporting plate 2 are put in order, and the stay anchor 4 is engaged at the upper end thereof into the nut 5, the upper packing 7 prevents any physical contact between the upper edge of the upper packing insert hole of the rail coupling plate 2 made of metal and the bottom surface of the nut 5, keeps the rail coupling plate 2 tight all the time, and eliminate the shock from the sides. The upper packing 7 is made of rubber with low elasticity or of urethane with low elasticity. Furthermore, the upper packing 7 provides insulation effects.

The pressing washer 10 is put on the upper packing 7, through which the stay anchor is inserted, for pressing the rail at a prescribed pressure to fix the rail. Furthermore, the pressing washer 10 prevents the lower side of the rail from coming off the ground at the curved section so that the train is not derailed.

The central washer 6 has a thickness enough to endure the press of the upper packing, and is provided with an anchor insert hole drilled with clearance so that it can not be in contact with the stay anchor even under the side pressures. Furthermore, the central washer 6 is insulated, In order to integrate the rail and the rail coupling plate 2 in a body, the spring clip 11 is put on the rail coupling plate 2, and the bolt 9 is inserted into the bolt hole 2b formed in the rail coupling plate 2. Consequently, the rail and the rail coupling plate 2 are pressed by the pressure of the spring clip 14, so that they are stabilized. Fig. 3 and Fig. 4 show the rail vibration isolator according to the present invention.

When the rail vibration isolator according to the present invention is laid on the existing concrete roadbed by replacement, the stay anchor hole is drilled at both sides of the rail between the existing rail and the rail tie on the concrete roadbed 12; the supporting plate 8, the vibration isolating pad 1, and the rail coupling plate 2 are integrated in a body by means of the adhesive agent; the integrated body of the supporting plate 8, the vibration isolating pad 1 , and the rail coupling plate 2 is placed under the lower part of the rail; the rail is fixed temporarily by measurement of the linearity and the height of the rail while the spring clip 11 is pressed by the bolt 9; epoxy is poured into the stay anchor hole at the concrete roadbed; the stay anchor is inserted vertically into the holes at both sides of the rail coupling plate 2 from top to bottom; the concrete is poured into the space between the vibration isolator and the concrete roadbed while the upper packing 7 and the pressing washer 10 is fixed and fastened by the nut temporarily; the poured concrete is cured; and the nut of the stay anchor 4 is fastened permanently.

If the adjustment of the height of the rail is required, the adjustment can be made by the thickness of the supporting plate 8. Between the rail coupling plate 2 and the stay anchor 4 are arranged the vibration isolating pad 1 and the upper packing 7 made of low elastic rubber or urethane. As a result, there is no additional insulator necessary.

When the train pass on the rail laid as shown in Fig. 2, the dynamic load from the train is absorbed by the rail pad 3 primarily before the dynamic load is transmitted to the rail coupling plate 2. The rest of the dynamic load is transmitted to the rail coupling plate 2. The rail coupling plate 2, which is subject to the rest of the dynamic load, is lowered by 1 mm - 2 mm along the stay anchor, and the vibration isolating pad 1 is pressed by the lowering rail coupling plate 2, to accomplish the secondary absorbing effect.

After the secondary absorbing effect has been completed, the concrete roadbed is hardly influenced by the vibration caused from the dynamic load of the train. Immediately after the train has passed on the rail, the rail coupling plate 2 is raised to return to its original state by virtue of the force of restoration of the vibration isolating pad 1. The rail 13 is returned to its original position by virtue of the dynamic stability of the rail pad 3 as well as the aforementioned force of restoration of the vibration isolating pad 1.

At this time, the upper packing 7 presses the rail coupling plate at a prescribed pressure to stabilize the rail and to eliminate the repulsive shock. The projecting portion lb of the vibration isolating pad fixes the side pressure of the rail and eliminates the shock to the stay anchor 1. If the adjustable upper packing 7a and the adjustable vibration isolating pad Id are used instead of the aforementioned upper packing and the vibration isolating pad, the adjustment of the position by +/- 5 mm from side to side can be made simply to the vibration isolator, which overcomes the drawback that the vibration isolator is slipped from side to side as in the existing elliptical anchor bolt hole while the train is run,

INDUSTRIAL APPLICABILITY

As described in detail above, with the rail vibration isolator according to the present invention, the rail coupling plate is vertically moved along the stay anchor 4 when the rail coupling plate 2 is lowered as the dynamic load is applied to the rail coupling plate and the rail coupling plate 2 is raised to return to its original state as the dynamic load of the train disappears. Consequently, the vertical movement of the rail coupling plate is made freely, while the movement occurred back and forth and the movement occurred from side to side are prevented, so that the rail is subject to uniform elasticity, with the results that no derailment of the train is possible, and thus safety is secured. Furthermore, the vibration isolator according to the present invention uses two of stay anchors of at least 32 MM, which provides excellent durability, while the existing vibration isolator uses four of small ( 22 MM) anchor bolts, which should be replaced due to corrosion in the damp situation.

In particular, the rail coupling plate, which is put on the stay anchor to be stabilized, is provided with a thick vibration isolating pad, which is provided for increasing the vibration isolating effect. Since the stay anchor 4 fixes the side pressures, any slip from side to side does not occur even if the thickness of the vibration isolating pad 1 is increased. Consequently, the vibration isolating effect is maximized without occurrence of the problems in connection with safety. The upper packing 7, which is made of rubber or urethane, eliminates the side shock during the movement of the train. Consequently, reduction of the noise is excellent at the curved section. Moreover, the durability of the concrete roadbed, the rail and the train is increased, and the passenger's feeling of taking a train is improved.

With the vibration isolator according to the present invention, the adjustment of the height cane be made by means of the supporting plate 8. The adjustment of the position of the hole of the packing can be made by the replacement of the adjustable upper packing 7a and the adjustable vibration isolating pad Id, so that the rail can be adjusted by +/- 5 mm from side to side. Besides, the current flowing through the rail coupling plate 2 is not transmitted to the stay anchor 4 by means of the vibration isolating pad 1 and the upper packing 7. As a result, any electrolytic corrosion of the concrete roadbed is prevented. Furthermore, the replacement of the upper packing 7 needs only to loosen the nut of the stay anchor, so that the quick replacement is possible. When the vibration isolating pad 1 is to be replaced, it is sufficient to raise the rail by 10 cm and remove the rail coupling plate 2. Consequently, it is simple and convenient to replace the vibration isolating pad L

Claims

WHAT IS CLAIMED IS:

1. A rail vibration isolator comprising: a rectangular vibration isolating pad (1) having a stay anchor insert hole (la) drilled near the both ends thereof, a thick inner part, and a thin edge, said vibration isolating pad (1) being made of rubber or urethane; a rail coupling plate (2) having a lower part, which said vibration isolating pad (1) is inserted beneath, and a upper part, which is provided with a upper packing insert hole (2a), a rail slip preventing protrusion (2f), a spring clip bolt hole (2b), a spring clip shp preventing protrusion (2e), and a rail pad slip preventing protrusion (2g); an upper packing (7) pressed against said rail coupling plate for preventing the movement from side to side and absorbing shock from the sides; a washer (6) for supporting said upper packing (7); a pressing washer (10) for pressing said upper packing (7); a stay anchor (4) for placing said vibration isolator between said concrete roadbed and said rail secured; and a nut, wherein an insulator made of rubber or urethane is arranged between said concrete roadbed and the rail thereby additional insulator being unnecessary.

2. The rail vibration isolator as claimed in claim 1 , wherein the adjustment of the height of said rail can be made by the adjustment of the thickness of said supporting plate (8), and further comprising an adjustable vibration isolating pad (Id) having a stay anchor insert hole located in different position from said stay anchor insert hole (la) of said vibration isolating pad (1), and an adjustable upper packing (7a) having a stay anchor insert hole located in different position from said stay anchor insert hole (7b) of said upper packing (7), so that said rail can be moved by +/- 5 mm from side to side without movement of said stay anchor (4).