JP4153867B2 - Tube with frame for rail insulation joint - Google Patents

Description

The present invention relates to a bolt for fastening a seam plate used for an insulation joint portion of a railroad rail, and a tube with a housing attached to the bolt for insulating the rail.
The railroad rails carry signals, commands, and other currents and radio waves necessary for safe operation of the vehicle. For this reason, a rail having a normal length is connected to the rail or welded to be electrically insulated every predetermined section (blocking section) to form a circuit. Insulation is performed between the rail connection part of the insulation section and the next insulation section, between the metal joint plate that sandwiches the end and end of the connection section, between both sides (abdomen) of the rail, and between the metal joint plates. It is also applied to bolts for fastening.

No. 7-7362

  Railroad rails are closed due to expansion and contraction due to the cold and warm weather of the season, repeated load of vertical vibration due to wheel load that occurs every time the vehicle passes, and as the number of connected vehicles increases and the load increases due to frequent operation. Insulation required for the rail joint portion forming the wire is required to be reliable, long-term and highly safe.

  The rail insulation joint part of the rail is composed of an insulating plate with a rail cross-section that is inserted into the rail-to-rail connection part (interval), and an insulating material that sandwiches two rails in the length direction of the joint part from both sides. A joint plate made of metal is applied to the outside of the joint plate made of an insulating material sandwiching the two rails of the insulation joint portion, and a fastening bolt hole including the rail between them is penetrated. Is provided. A tube made of an electrically insulating material is inserted in order to insulate the bolt to be fastened through the bolt hole of the metal seam plate passing through these and the bolt hole provided in the rail, and the fastening bolt is inserted into the tube. The insulation seam is formed by tightening with a nut. Insulation plates are also installed between the rails of the insulation seam and sleepers.

  A tube with a casing in which a casing made of an insulating material is fixedly integrated with the tube is known at one end of a tube for bolt insulation used for an insulating joint portion of a rail (see, for example, Patent Document 1). ). As shown in FIG. 1 of the above-mentioned prior art document 1, the tube with a housing is formed by integrally fixing a housing made of composite reinforcing fiber and resin to the tube.

This tube with a casing is made by laminating a glass fiber cloth and a vinylon fiber cloth, and processing a plate made of a laminated body integrally cured with a thermosetting resin into a disk shape. Aramid fiber cloth is laminated on a cylindrical body, impregnated with a thermosetting resin of the same quality as that used for the casing, cured to form a tube, and this is fitted to the casing, and the fitting portion is These are fixed together with the same quality thermosetting resin.
In addition, the central part of the housing created in the same manner as above is hollowed out to a diameter equal to the thickness of the tube part, placed in a mold, the mold is closed, and a tube is formed in the hollowed part of the housing. A thermosetting resin such as a polycarbonate resin is injected and then heat-cured to integrally fix the housing and the tube.

  The present invention has a long service life that does not bend or break even under severe loads at all times, especially in long-distance trains, long trains, frequent operation, and long-term safe, reliable trains, trains, etc. It is intended to provide a tube with a casing for insulation of rail insulation joint bolts that can contribute to the maintenance of a signal circuit that can be operated safely and on time.

  The present invention comprises a laminated body of a glass fiber cloth impregnated with an epoxy resin and a vinylon fiber cloth, and a casing formed by curing the impregnated epoxy resin, the glass fiber cloth impregnated with the epoxy resin as an outer layer, and an aramid fiber cloth. And an intermediate layer made of a laminated body of glass fiber cloths and an end of a tube made of a laminated body having a polycarbonate resin as an inner layer and screwed and fixed to the tube with a frame for a rail insulation joint.

Further, in the present invention, the screw groove provided in the housing is screwed to the screw thread provided at one end of the tube, and an adhesive is injected into the screwed portion to firmly fix the housing and the tube portion. It exists in the said tube with a frame for insulation joints formed.
Furthermore, the present invention resides in the above-described tube with a casing for an insulating seam in which a casing is rectangular and a plurality of tubes are screwed and fixed thereto.

  The tube with a frame used for the rail insulation joint portion of the railway of the present invention has moderate elasticity and abrasion resistance, and also has extremely high pressure resistance and excellent toughness. In contrast to the case where the housing and the tube part are detached or the case is cracked in the vibration application test of 100,000 times, the insulation strength is reduced and the replacement is required. The attached tube does not break the housing and / or the tube even when subjected to vibration 1 million times in the vibration application test, and the tube portion and the housing are not detached. Therefore, it is possible to reduce the frequency of disassembling complicated rail insulation joints and replacing the tube with the frame, which contributes to the effect of improving the reliability of railway maintenance, safe driving and operation. .

  In addition, when using a tube with a housing in which a plurality of, for example, 2 to 6 tubes are integrally provided on a rectangular housing, and assembling or replacing a rail insulation joint, when using a tube with a circular housing It is not necessary to individually fit into the tightening bolt holes as in the case of, and it is usually necessary to finish the work in a short time. Work efficiency can be significantly increased. In particular, it is very significant that it can be exchanged in a short time in a frequent operation section near a large city.

  The pressure applied to the tube with the frame for the rail insulation joint, that is, the fastening force of the bolt required to fix the rail is usually 10 tons or more. If the bolt is normally fastened, the pressure should be sufficient. Although it can withstand, in addition to the repeated sinking of the rail due to the wheel load when the vehicle passes, the rail subsidence changes due to the strength of the railway laying ground, repeated vibrations, expansion and contraction of the rail in the length direction in the summer and winter, etc. The tube part is pushed and bent along the bending of the bolt even though the casing is fixed at a right angle to the joint plate at the beginning of assembly due to the force by which the fastening bolt is pushed and bent. The tube may be detached from the tube portion, and as a result, the insulation strength may be reduced.

In the present invention, a casing made of a laminated material of glass fiber cloth and vinylon fiber cloth impregnated with an epoxy resin is composed of an outer layer of glass fiber cloth, an intermediate layer made of an alternating laminate of aramid fiber cloth and glass fiber cloth, and polycarbonate. This is a tube with a casing for a rail insulation joint, in which a casing is fixed by screwing to a tube portion made of a laminate having a resin layer as an inner layer.
Furthermore, the present invention is a tube with a frame for a rail insulation seam in which the screw and fixing portion are impregnated and infiltrated with an adhesive so that the frame and the tube are firmly bonded.

  The accompanying drawings are for explaining an embodiment of the present invention, and FIG. 1 shows a tube with a housing in which a tube portion 2 is screwed and fixed to a circular housing 1 of the present invention. 1 (1) is a longitudinal sectional view, FIG. 1 (2) is a sectional view taken along line AA in FIG. 1 (1), and FIG. 2 is an enlarged sectional view of a screwing portion.

  In FIG. 1, the outermost layer (A) of the tube portion 2 is a threaded layer made of a laminated body of glass fiber cloth. A reinforced resin layer using a glass fiber cloth laminate as a reinforcing fiber has a feature that threading can be performed cleanly and easily. In the case of a laminated body made of other composite reinforcing fibers such as an aramid fiber cloth, for example, this cannot be threaded cleanly. As a result, the coupling force of the threaded portion between the housing 1 and the tube portion 2 becomes weak. It is not preferable.

  The intermediate layer (b) constituting the tube part 2 is a layer in which aramid fiber cloth and glass fiber cloth are alternately laminated, both impregnated with epoxy resin, and sequentially wound around a cylindrical body (c) made of polycarbonate resin. After the glass cloth (a) impregnated with several epoxy resins is finally laminated, the resin is heat-cured and cut to the required dimensions to form the tube portion 2.

The casing 1 is made by laminating several to several tens of vinylon fiber cloths (e) impregnated with an epoxy resin and glass fiber cloths (d) impregnated with an epoxy resin while changing the angle in parallel or alternately. The laminated body heated and cured is cut into a circle or a rectangle. The casing cut into a circle cuts out a circle having a required radius from the center of the circle (corresponding to the outer diameter of the tube portion 2), and cuts the thread groove 4 in the cross section.
On the other hand, at one end portion of the tube portion 2, a thread 3 is cut in the laminated portion of the glass fiber cloth of the tube portion 2 (outer layer (i) of the tube portion) in a width corresponding to the thickness of the casing 1. The screw thread 3 is screwed into a screw groove 4 provided in the housing 1 so that the housing 1 and the tube portion 2 are integrated. The thread provided on the tube portion 2 is preferably slightly longer than the width of the housing 1. The screw preferably has a pitch of 1.0 to 1.5 mm and a height (thread groove depth) of 0.25 to 1.0 mm.

  The screwed connection in the present invention is very strong and does not easily cause the housing 1 and the tube 2 to come off or partly remove the housing and cause a decrease in insulation. After joining, a strong liquid instant adhesive, for example, cyanoacrylate instant adhesive, is injected into the threaded portion and solidified, so that the connection between the housing 1 and the tube 2 becomes stronger and the threaded portion is prevented from loosening. And preferred.

  In the present invention, the casing 1 is not limited to a circular shape, and a plate in which a thermosetting resin is impregnated and cured on a laminate of vinylon fiber cloth (e) and glass fiber cloth (d) is provided on both sides of the rail of the rail joint. The surface (belly) is cut into a rectangular shape as shown in FIG. 3 (2) so that the surface (belt) can be brought into contact with a steel seam plate sandwiched through an insulating material. A bolt insertion hole is drilled, a thread groove is cut in the same manner as a circular housing, and a plurality of tube portions 2 are screwed and fixed to the thread groove as shown in FIG. Also good. This has good work efficiency such as assembly of rail insulation joints and bolt replacement, and is suitable for railways in and around metropolitan areas that are frequently operated. Of course, in this case as well, the adhesive is permeated and solidified into the threaded portion, and the fixing of the rectangular plate, which is the casing, and the tube is further strengthened, so the effect of the present invention can be further improved.

  Next, the present invention will be further described with reference to examples. The conventional product used for comparison with the tube with the casing of the present invention obtained in the examples was a tube with a flange described in the latter part of the paragraph No. 0006 as a control product. The pull-out strength was measured by the apparatus shown as a conceptual diagram in FIG.

[Create tube section]
A polycarbonate resin tube (manufactured by Teijin Ltd.) having an inner diameter of 19.5 mm and an outer diameter of 19.75 mm (thickness of 0.25 mm) is prepared. To this, 1,500 d × 17 aramid fibers (both vertically and horizontally) Product name: Teijin Technora, manufactured by Teijin Limited, number of shots: vertical and horizontal 17 each / 25mm, and 22.5dtex glass fiber driven number: vertical, horizontal 60 / 25mm plain weave cloth, This was impregnated with an epoxy resin (Dainippon Color Co., Ltd.) and then wound around the polycarbonate resin tube to form a pressure-resistant and wear-resistant layer. A glass fiber of 22.5 dtex on both sides, the number of shots: length, 60 horizontal / 60 mm high density plain weave cloth is impregnated with the same epoxy resin as above, and the thickness of the layer is 3 mm so that the thickness becomes 0.5 mm after curing ~ 4 rolls After conditioning the outer diameter by 3-point roll rotating it by a conventional method, the epoxy resin impregnated heated and cured to prepare an outer diameter 25 mm, inner diameter 19.5mm tube.
This is cut into a length of 37 mm, and a meter defined in “JIS B 0205” is formed on the outer glass layer of the tube part 2 up to a position of 4 mm (corresponding to the thickness of the casing 1) from one end. Coarse thread “pitch 1” threading was performed.

[Create body]
The number of glass fibers driven in 22.5 dtex both vertically and horizontally: The same epoxy resin as described above was applied and impregnated onto a 60 mm / 25 mm flat weave cloth, and a plurality of these were laminated. The same epoxy resin is applied and impregnated onto a vinylon plain woven cloth (manufactured by Saito Textile Co., Ltd.) having a length of 34/50 mm and a width of 33.5 / 50 mm. Were alternately pressed and heated by a conventional method so that the thickness after curing was 4 mm, to prepare a plate-like laminate having a thickness of 4 mm. The obtained plate-like laminate is cut into a disk having a diameter of 42.5 mm, and then cut from the center to a radius of 12 mm (corresponding to the outer diameter of the tube portion), and then the glass fiber of the tube is formed on the inner surface of the cut portion. The thread groove 4 corresponding to the threaded portion 3 provided at one end of the layer (a) was processed.

[Production of tube with housing]
The thread portion 3 provided at the end of the outer surface of the tube portion 2 obtained as described above and the screw groove portion 4 provided on the inner surface of the housing are screwed together as shown in FIG. A tube with a housing was created.
Furthermore, a cyanoacrylate adhesive (product name: Aron Alpha Co., Ltd., manufactured by Toa Gosei Co., Ltd.) is injected and infiltrated into the threaded portion of the tube with the casing thus obtained as a liquid instantaneous adhesive, and fixed for adhesion and rail insulation. A tube with a housing was obtained.

[Control example]
A tube with a casing manufactured in the conventional example described in the latter part of paragraph No. 0006 was used as a comparative product. The dimensions of the contrasted tube with the casing are the same as those in this example.

[Example 2]
As shown in FIG. 3 (2), the casing was cut into a rectangular shape having a length of 50 mm and a width of 336 mm, and one box was obtained at a position 38 mm from both ends. A hole with a diameter of 26 mm is drilled in the middle, and a thread groove for threading a tube is cut in the cross section of each hole in the same manner as in the first embodiment. The tube portion is screwed, and a liquid instant adhesive is injected and fixed, and a rectangular housing 1 integrated with a plurality of tube portions 2 as shown in FIGS. 3 (1) and 3 (2) is attached. A tube with a housing was obtained.

[Action]
In the tube with a casing of the present invention, the inner layer polycarbonate resin layer (c) of the tube part 2 protects the contact surface of the fastening bolt and is a laminate of the aramid fiber cloth and the glass fiber cloth of (b) which is an intermediate layer. The layer serves as a pressure-resistant and wear-resistant layer for the tube with the housing. A threaded layer is formed on the high-density glass fiber cloth laminate (A) on the surface of the tube portion 2. The threaded layer may be a layer made of an aramid cloth and a glass fiber cloth. However, the threading process cannot be performed in an orderly manner, and therefore, the screwed portion between the housing and the tube cannot be firmly fixed.

  The pull-out strength from the housing 1 of the tube portion 2 formed of the three layers (A), (B), and (C) obtained in Example 1 reaches 4.51 kN.

[Pullout test]
Table 1 shows the results of the pull-out test between the tube with the casing obtained in Example 1 and the conventional product. The pull-out test was performed according to JIS E3023 “Rail insulation material test method”.
As shown in FIG. 4, the tube with the housing is inserted from the tube side until the housing 1 comes into contact with the jig 5, and the jig 6 is adjusted by the tube pressurizing jig 6 with the thickness of the tube portion. The load P is applied so that the position is approximately ½, and the load is applied until the housing 1 is detached from the tube portion 2 (the device uses an autograph machine 1S-500 manufactured by Shimadzu Corporation, temperature 20 ° C., humidity (Measured at 70%), and the fixing state (bonding strength) of the housing 1 and the tube portion 2 is measured. The unit is kilonewtons (kN).
The pull-out test was performed on a test object that was given 1 million times of vibration in a vibration test described later.

[Vibration test]
In the fixing jig, four tubes with housings that have been subjected to the pull-out test obtained in Example 1 are set, and the bolts set on the vibration generation side are inserted into the tube, and the frequency is 10 Hz and the amplitude is 10 mm. A vibration test was performed by applying vibrations up to 1 million times in the vertical direction. At the time of the number of times of vibration given in Table 2, the state and appearance of the fixed part between the housing 1 and the tube part 2 were visually evaluated. In addition, the penetration | invasion of the volt | bolt in the tube was performed by setting to 25 mm from the fixing jig front-end | tip.

表２において、「抜け」とは、鍔体が平行に移動するのではなく、一部はチューブに固定されており、一部がチューブより移動し鍔体がチューブに対し斜めになっている状態を指す。

In Table 2, “missing” means that the housing does not move in parallel, but part of it is fixed to the tube, part of it moves from the tube, and the housing is inclined with respect to the tube. Point to.

FIG. 5 shows an example of the usage state of the tube with a casing of the present invention.
The tube portion 2 of the tube with the housing is inserted into the fastening bolt 10, the flange portion 1 is brought into contact with the washer 11, and the bolt 10 with the tube portion 2 inserted into the bolt is attached to the metal joint plate 8, its insulating plate 9 and the rail. Through the provided bolt insertion hole, it protrudes to the other end through the insulating plate 9 and the metal joint plate 8 on the opposite side, and a tube with a casing is inserted from the tube portion 2 into the protruding portion, and a washer 11 is inserted into the bolt protruding portion. Abutting against the flange 1, the bolt 10 is strongly tightened with two nuts 12 via a washer 11 to form an insulating seam. At this time, the force at the time of fastening the nut exceeded 10 tons. In FIG. 6, reference numeral 13 denotes an insulating plate between the rail and sleepers.
The tube with a casing of the present invention is used as described above, and as shown in Tables 1 and 2, the pull-out strength is 1.6 times that of the conventional product, and the variation of each product is the conventional. It is extremely small compared to products, and in the vibration test results, there is very little detachment of the fixing part of the frame and tube. Used for fastening bolts for insulation joints on railroad rails, trains, trains, rental cars The operational safety of railways has increased, and long-term use is possible, and the reliability and contribution to safe driving of railways are extremely high.

FIG. 1 (1) is a secondary sectional view of the tube with a frame for rail insulation joint of the present invention, and FIG. It is an expanded sectional view of the screwing part of a housing and a tube part. It is the top view and side view of a tube with a housing which made the housing square. It is a conceptual diagram of a drawing strength test apparatus. It is sectional drawing which shows the use condition of the tube with a frame for this invention rail insulation seams.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Tube part 3 Screwing part 4 Thread 5 Jig 6 Pushing jig 7 Rail 8 Metal rail joint board 9 13 Insulation board 10 Fastening-like bolt 11 Washer 12 Nut

Claims (4)

  It consists of a laminated body of glass fiber cloth impregnated with epoxy resin and vinylon fiber cloth, and a casing formed by curing the impregnated epoxy resin is made of glass fiber cloth impregnated with epoxy resin as an outer layer, aramid fiber cloth and glass fiber, respectively. A tube with a housing for a rail insulation joint, which is screwed and fixed to an end portion of a tube made of a laminated body having a cross-layered body and an inner layer made of a polycarbonate resin.   The tube with a frame for a rail insulation joint according to claim 1, wherein the screwing and fixing portion between the frame and the tube is hardened and fixed by an adhesive.   The tube with a frame for a rail insulation joint according to claim 1, wherein the frame has a disk shape.   The tube with a housing for a rail insulation joint according to claim 1 or 2, wherein the housing is rectangular, and a plurality of the tubes are screwed and fixed thereto.

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