JP2021095776A - Sleeper with embedded plug and manufacturing method for the same - Google Patents

Abstract

To provide a sleeper with an embedded plug and manufacturing method for the same.SOLUTION: A sleeper with an embedded plug comprises: a sleeper body 2 having an embedded hole 3; and an embedded plug 5 embedded in the embedded hole 3. The embedded plug 5 includes: a cylindrical body 5a; a first flange part 5d provided on a base end side of the cylindrical body 5a; and a second flange part 5g provided on a tip end side of the cylindrical body 5a. The first flange part 5d is arranged on a bottom side of the embedded hole 3. At least a part of an outer peripheral surface of the second flange portion 5g is in contact with an inner peripheral surface of the embedded hole 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to sleepers with an embedded plug and a method for manufacturing the same.

In recent years, railway companies have been promoting anti-vibration measures for tracks with the renewal of turnouts, and anti-vibration measures are being promoted by fixing anti-vibration rubber around pillows.
When fixing the anti-vibration rubber around the pillow, a resin embedding plug (hereinafter referred to as an insert) for fixing the anti-vibration rubber is embedded in a predetermined position of the synthetic pillow, and the screw hole provided in the embedding plug is used. Anti-vibration rubber is fastened by screwing hexagon bolts (see Patent Documents 1 and 2).

Further, in the case of a PC (precast concrete) sleeper, when the sleeper is molded, the insert is fixed to the formwork in advance and concrete is poured into the pillow to integrate it with the pillow.
On the other hand, in the case of a synthetic sleeper, a hole for inserting an insert is made after molding the pillow, an adhesive or the like is injected into the hole, and the insert is inserted to integrate the insert with the pillow.

FIG. 5A shows one side end 101 of the conventional PC sleeper 100, and is a U-shaped frame in a plan view so as to be along the bottom side of both side surfaces 102 and the bottom side of the end surface 103 in this one side end portion 101. A shape-like anti-vibration rubber 104 is arranged. Further, the anti-vibration rubber 104 is fixed to the PC sleeper 100 by screwing a hexagon socket head cap screw 105 into the side surface 102 and the end surface 103 of the PC sleeper 100 through the anti-vibration rubber 104.
In the case of the conventional PC sleeper 100, the inserts 110 having a flange portion 109 provided on the bottom side of the bottomed tubular main body portion 108 shown in FIGS. 5 (b) and 5 (c) are provided on both sides of the PC sleeper 100. It is embedded in the face and end face. Further, a screw hole 111 is formed inside the main body 108, and the insert 100 is embedded in the PC sleeper 100 so that the screw hole 111 is exposed on the side surface or the end surface of the PC sleeper 100.
Therefore, the anti-vibration rubber 104 can be fixed to the PC sleeper 100 by screwing the hexagon socket head cap screw 105 penetrating the anti-vibration rubber 104 into the screw hole 111 of the insert 100.

Japanese Patent No. 3615678 Japanese Patent No. 3818636

In the case of the PC sleeper 100 shown in FIG. 5A, since the insert 110 is fixed to the mold at the time of molding, the insert 110 can be accurately positioned.
On the other hand, in the case of a synthetic pillow, it is necessary to provide an embedding hole at a required position of the pillow and fix the insert inside the embedding hole with an adhesive or the like.
FIG. 6 shows an example of a state in which an embedding hole 113 is provided at a required position of the synthetic sleeper 112, and an insert 114 is embedded and fixed in the embedding hole 113 with an adhesive 115.

The anti-vibration rubber 116 attached to the synthetic sleeper 112 is formed with a pilot hole 118 as a stepped hole for fixing into which a hexagon socket head cap screw 117 can be inserted in advance at a predetermined position.
The embedded hole 113 formed in the synthetic sleeper 112 has an inner diameter slightly larger than that of the insert 114. Therefore, as shown in FIG. 6, when the adhesive is cured while the center of the prepared hole 113 and the axis of the insert 114 are deviated from each other, the hexagon socket head cap screw 117 can be screwed into the screw hole of the insert 114. Therefore, there is a problem that the anti-vibration rubber 116 cannot be fixed.
Further, as shown in FIG. 7, if the adhesive 115 filled in the embedding hole 113 may overflow from the opening of the embedding hole 113, the adhesive 115 may be hardened in a state of entering the inside of the insert 114. There is. In this case, the adhesive may be hardened while a part of the adhesive is still in the screw hole 114a of the insert 114. In this case as well, the hexagon socket head cap screw 117 cannot be screwed into the screw hole 114a. There was a risk that the anti-vibration rubber could not be fastened with the square hole bolt 117.

The present invention has been made in view of the above circumstances, and even in a type of sleeper in which the insert is adhered and fixed to the embedding hole, the insert can be accurately positioned and adhered to the embedding hole. An object of the present invention is to provide a sleeper with an embedded plug that can accurately and reliably attach anti-vibration rubber using an insert.
It is also an object of the present invention to provide a method of manufacturing a sleeper that can provide a sleeper with an insert that is accurately positioned in the embedding hole.

In order to solve the above problems, the present invention proposes the following forms.
(1) The sleeper with an embedding plug according to the present embodiment includes a sleeper main body having an embedding hole and an embedding plug embedded in the embedding hole, and the embedding plug has a tubular shape. It has a main body portion, a first flange portion provided on the base end portion side of the tubular main body portion, and a second flange portion provided on the tip end portion side of the tubular main body portion. The flange portion is arranged on the bottom side of the embedding hole, and at least a part of the outer peripheral surface of the second flange portion is in contact with the inner peripheral surface of the embedding hole.

By providing an embedding plug in the embedding hole so that the second flange provided on the tip side of the tubular body is in contact with the inner peripheral surface of the embedding hole, the tubular body is positioned at the center of the embedding hole. Can be accurately positioned. Therefore, by using the embedding plug accurately positioned at the center of the embedding hole, it is possible to accurately and surely attach a member such as a vibration isolator that needs to be fixed at a predetermined position of the sleeper main body.

(2) In the sleeper with an embedding plug according to the present embodiment, a configuration in which an adhesive layer is provided around the embedding plug arranged in the embedding hole can be adopted.

By surrounding the embedding plug of the embedding hole with an adhesive layer, the mounting strength of the embedding plug to the embedding hole can be improved. Since the adhesive layer adheres and fixes the first flange portion provided on the embedding plug into the embedding hole, the mounting strength of the embedding plug is improved.
Further, the opening of the tubular main body of the embedding plug is located at the opening of the embedding hole, but since there is a second flange around the opening, the embedding hole is filled with an adhesive and embedded. When the stopper is inserted into the embedding hole, the second flange portion suppresses the infiltration of the adhesive into the tubular main body portion, assuming that the adhesive slightly overflows from the opening of the embedding hole. Therefore, there is no problem in attaching a member such as a vibration isolator to the sleeper main body.

(3) In the sleeper with an embedding plug according to the present embodiment, a screw hole is formed in the tubular main body portion to open on the tip end side of the tubular main body portion, and the tip opening of the screw hole is embedded. A configuration exposed in the opening of the hole can be adopted.

By providing a screw hole that opens on the tip side of the tubular body and is exposed at the opening of the embedding hole, the screw hole that is accurately positioned is used, and by using a bolt that is screwed into this screw hole, Members such as anti-vibration members can be securely attached to the sleeper body.

(4) In the sleeper with an embedding plug according to the present embodiment, the embedding plug is outside the resin tubular main body portion obtained by integrally molding the first flange portion and the tip portion of the tubular main body portion. A configuration including a resin square nut that is inserted to form the second collar portion can be adopted.

By forming the embedding plug with a resin tubular body and a square nut, it contributes to weight reduction and cost reduction of the embedding plug. By forming the second flange portion from a resin square nut, the second flange portion that can be fitted into the opening of the embedding hole can be realized inexpensively and easily.

(5) In the sleeper with an embedded plug according to the present embodiment, a plurality of the embedded holes are formed at the end of the sleeper main body, and a vibration isolator is attached to the end of the sleeper main body. It is possible to adopt a configuration in which the vibration-proof member is fixed to the sleeper by a mounting bracket joined to the embedding plug by inserting a through hole formed in the vibration-proof member.

An embedding plug that is accurately positioned can be provided at the center of the embedding hole, and the anti-vibration member can be accurately and securely attached to the target position of the sleeper body by using the mounting bracket joined to this embedding plug. be able to.

(6) The method for manufacturing a brim according to the present embodiment includes a step of filling an embedding hole provided in the brim main body with an adhesive, and a tubular main body and the tubular main body in the embedding hole. In arranging the embedding plug having the first flange portion provided at the base end portion of the above and the second flange portion provided at the tip end portion of the tubular main body portion, the first flange portion is used as described above. It is characterized by having a step of inserting it into the bottom side of the embedding hole and inserting the second flange portion so as to be in contact with the inner peripheral surface of the opening of the embedding hole.

An adhesive is filled in the embedding hole provided in the sleeper main body, and an embedding plug having a tubular main body, a first flange and a second brim is inserted into the embedding hole, and a second By inserting the flange portion so as to contact the inner peripheral surface of the opening of the embedding hole, an embedding plug in which the tubular main body portion is accurately positioned can be provided at the center of the embedding hole by using the second flange portion as a guide. it can. Therefore, it is possible to provide a sleeper in which a member such as a vibration isolator is attached at an accurate position by using this embedding plug.

(7) In the method for manufacturing a kuragi according to the present embodiment, the tubular main body is made of a resin molded product in which the first flange is integrally molded, and is extrapolated to the tip of the tubular main body. The embedding plug provided with a resin square nut constituting the second collar can be used.

An embedding plug provided with a resin tubular body and a resin square nut can provide a sleeper equipped with a lightweight and inexpensive embedding plug.

According to the present invention, the tubular main body portion is provided by providing an embedding plug in the embedding hole so that the second flange portion provided on the tip end side of the tubular main body portion is in contact with the inner peripheral surface of the embedding hole. Can provide sleepers with embedding plugs that are precisely positioned at the center of the embedding hole.
For this reason, using an embedding plug that is accurately positioned at the center of the embedding hole, embedding that can accurately and reliably attach members such as anti-vibration members that need to be fixed at a predetermined position on the sleeper body. We can provide sleepers with stoppers.

It is a side view which shows a part of the pillow of one Embodiment which concerns on this invention. It is a partial cross-sectional view which shows the embedding hole formed in the sleeper. The process of attaching the embedding plug to the same pillow is shown. (A) is an exploded perspective view of the tubular body and the hexagon nut, and (b) is the embedding with the hexagon nut attached to the tubular body. A perspective view showing a state in which the plug is configured, (c) is an explanatory view showing a state in which the adhesive is injected into the embedding hole of the pillow, and (d) is an embedding plug in the embedding hole into which the adhesive is injected. An explanatory view showing a state during insertion, (e) is an explanatory view showing a state in which a hexagon nut of an embedding plug inserted into the embedding hole is fitted into the opening of the embedding hole with a hammer. .. A comparative example of fixing a conventional embedding plug to a sleeper is shown, and (a) is an explanatory view showing a state in which the conventional embedding plug is inserted into a positioning jig and fixed with a hexagon nut, (b). ) Is a back view of the same state, (c) is an explanatory view showing a state in which an adhesive is injected into the embedding hole, and (d) is a conventional embedding plug inserted into the embedding hole using a positioning jig. It is explanatory drawing which shows the state which was done. (A) is a perspective view showing a state in which anti-vibration rubber is attached to a general PC sleeper, (b) is a side view showing a conventional embedding plug embedded in the PC sleeper, and (c) is the same embedding. It is a top view of the plug. FIG. 5 is a cross-sectional view showing a state in which the embedding position is displaced when the conventional embedding plug is fixed to the embedding hole of the pillow with an adhesive. It is sectional drawing which shows the state which the adhesive has penetrated inside the insert when the conventional embedding plug is fixed to the embedding hole of a pillow with an adhesive.

Hereinafter, a sleeper with an embedded plug and a method for manufacturing the sleeper according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the sleeper 1 includes a sleeper main body 2, an embedding plug 5 embedded in a plurality of embedding holes 3 formed in the sleeper main body 2, and each embedding. An adhesive layer 6 filled in the insertion hole 3 and a vibration-proof member (vibration-proof rubber) 8 fixed to the sleeper main body 2 by a mounting bolt (mounting bracket) 7 coupled to the embedding plug 5 are provided. There is.

The sleeper main body 2 is, for example, a synthetic sleeper formed in a rectangular parallelepiped shape that is long in the width direction of the rail 10 and has a wall thickness. In FIG. 1, only one of the pair of rails 11 constituting the rail 10 is shown, and the sleeper main body 2 in the vicinity of the one rail 11 is shown.
The synthetic sleepers are formed of, for example, urethane foam reinforced with glass fibers. Synthetic sleepers may contain solid fillers such as silica sand, fly ash and rubber chips. Further, a part of the synthetic pillow may contain different materials such as rubber and a resin sheet. Specifically, the sleeper main body 2 is preferably formed of, for example, Eslon Neo Lumber FFU (registered trademark, manufactured by Sekisui Chemical Co., Ltd.). Eslon Neo Lumber FFU is a thermosetting resin foam formed by aligning long glass fibers in a predetermined direction (for example, the length direction of the sleeper main body 2) and burying them in a thermosetting resin.

A wooden sleeper, a plastic sleeper, or the like may be used as the sleeper main body 2. The wooden sleepers are not particularly limited to any type of wood. Further, a part of the wooden pillow may contain different materials such as rubber and a resin sheet.
The plastic sleepers are formed of a molded body made of a thermoplastic resin. The plastic sleepers may contain solid fillers such as silica sand, fly ash and rubber chips. Further, a part of the plastic pillow may contain different materials such as rubber and a resin sheet.

The tie plate 12 is fixed at a position on the upper surface 2a of the sleeper main body 2 to receive the rail 11, and the width of the tie plate 12 along the width direction of the rail 11 (the width direction of the rail 10) is on both ends in the width direction of the rail 11. It is formed in a width that allows the fixing bolt 15 and the bolt shaft 17, which will be described later, to be installed.
Below both ends of the tie plate 12 in the width direction shown in FIG. 1 (below both ends of the tie plate 12 along the width direction of the rail 10), screw holes (not shown) that open on the upper surface side of the sleeper main body 2 are formed. The tie plate 12 is fixed to the upper surface 2a of the sleeper main body 2 by screwing the fixing bolt 15 into the screw hole through the end portion of the tie plate 12.

The method of fixing the rail 11 to the tie plate 12 is not particularly limited. In the form shown in FIG. 1, the bolt shaft 17 projects from the upper surface side of the tie plate 12, and the washer 16, the washer 20, 21, and the nut 22 are screwed into the bolt shaft 17 in this order from the tie plate 12 side.
One ends of the washers 16 and 16 arranged on the tie plate 12 are arranged above the rail base 11a of the rail 11. By tightening the nut 22 screwed into the bolt shaft 17, the rail base 11a is pressed against the lower tie plate 12 via the washer 20 and 21 and the washer 16. As described above, the rail 11 is fixed to the tie plate 12.

At the end of the tie plate 12, a washer 23 and a washer 24 are inserted between the head of the fixing bolt 15 and the tie plate 12, which is a portion through which the fixing bolt 15 is inserted.
Regarding the structure for fixing the rail 11 and the tie plate 12, the structure shown in FIG. 1 is only an example. For example, any of general fixing structures such as a structure in which the rail 11 and the tie plate 12 are fixed by using a spike driven into the sleeper main body 2 and a structure in which the spike and the mounting bolt are combined may be adopted.

It is on the one end side in the length direction of the sleeper main body 2, and is prevented so as to be located below the tie plate 12 from the end surface 2b side of the sleeper main body 2 to the bottom side of the side surface 2c of the sleeper main body 2. A U-shaped frame-shaped anti-vibration member 8 made of rubber is fixed.
The anti-vibration member 8 includes a strip-shaped elastic pad 8a for the end portion that is in close contact with the bottom side of the end surface 2b along the end surface 2b of the sleeper main body 2, and the anti-vibration member 8 along the side surface 2c of the sleeper main body 2. It is formed in a U-shaped frame in a plan view, which is formed of a strip-shaped elastic pad 8b for a side portion which is closely attached along the bottom side of the side surface 2c. In the form shown in FIG. 1, stepped through holes 8c are formed at three locations in the length direction of the elastic pad 8b for the side portion, and stepped through holes 8c are formed at one location in the central portion in the length direction of the elastic pad 8a for the end portion. 8c is formed. The anti-vibration member 8 is fixed to the sleeper main body 2 by mounting bolts 7 such as hexagon socket head bolts that penetrate the through holes 8c.

Although the detailed structure of the through hole 8c of the anti-vibration member 8 is omitted in FIG. 1, a stepped hole having the same structure as the prepared hole 118 formed in the anti-vibration rubber 116 of the conventional structure shown in FIG. 6 is adopted. ing. The anti-vibration member 8 is fixed to the sleeper main body 2 by joining the mounting bolt 7 through which the stepped hole is inserted to the embedding plug 5 described later.

The portion where the mounting bolt 7 penetrating the anti-vibration member 8 is connected to the sleeper main body 2 has an embedded hole 3 having a cross-sectional structure of FIG. 2 and a structure shown in FIGS. 3 (a) and 3 (b). However, an embedding plug 5 fixed in the embedding hole 3 is provided.
The embedding hole 3 has a round hole shape having an inner diameter of about several times the shaft diameter of the mounting bolt 7, and an embedding plug 5 having a tubular main body portion 5a at the center thereof is surrounded by an adhesive layer 6. It is inserted and fixed in the state. The embedded hole 3 is not limited to a round hole shape, and may be a hole having another shape such as a square hole shape, and the shape of the embedded hole 3 is not particularly limited.

The tubular main body 5a of the embedding plug 5 is made of a thick resin-made bottomed cylindrical body, has a bottom wall 5b on the base end side, and extends the bottom wall 5b from the bottom of the tubular main body 5a. It has a rectangular ring-shaped first flange portion 5d formed so as to project from the outer circumference. The amount of protrusion of the first flange portion 5d that projects from the bottom of the tubular body portion 5a in the outer peripheral direction is such that it does not hinder the insertion of the tubular body portion 5a into the embedding hole 3. The amount is set. In the rectangular ring-shaped first flange portion 5d, a triangular plate-shaped reinforcing rib 5e extending toward the center side in the length direction of the tubular main body portion 5a is integrally formed at each corner portion.

The length of the tubular main body 5a is formed to be slightly shorter than the depth of the embedding hole 3. Further, as shown in FIG. 3A, a screw hole 5f is formed on the inner peripheral side of the tubular main body 5a, and the previous mounting bolt 7 is screwed into the screw hole 5f.
Next, a square nut 31 made of a hexagon nut made of resin or the like is fitted to the tip of the tubular main body 5a, and the square nut 31 causes a second flange to be attached to the tip of the tubular main body 5a. 5 g is formed. The inner diameter of the central hole 31a of the square nut 31 is set to a size that allows the tip of the tubular main body 5a to be fitted. Further, in the square nut 31 extrapolated to the tip end portion of the tubular main body portion 5a, the outer end surface 31b is fitted so as to be flush with the tip end surface of the tubular main body portion 5a.

The outer diameter of the second flange portion 5g is substantially the same as or slightly larger than the inner diameter of the opening of the embedding hole 3.
The outer diameter of the second flange portion 5g is formed to be substantially equal to or slightly larger than the inner diameter of the opening of the embedding hole 3, so that the center of the square nut 31 is located at the center of the opening of the embedding hole 3. In addition, it means that the square nut 31 can be easily inserted into the opening or driven by a tool such as a hammer.
For this purpose, when the second flange portion 5 g is composed of a hexagon nut as an example, the diameter of the circumscribed circle of the hexagon nut may be equal to or slightly larger than the inner diameter of the opening of the embedding hole 3. desirable. Even if the diameter of the circumscribed circle of the hexagon nut is slightly larger than the inner diameter of the opening of the embedding hole 3, the opening of the embedding hole 3 can be opened at the corner of the hexagon nut by driving with a tool such as a hammer. If the hexagon nut can be fitted into the embedding hole 3 while being slightly deformed, it can be applied to the present embodiment. As the square nut, any polygonal nut such as a square nut, a pentagon nut, a hexagon nut, or an octagon nut may be used.

The member constituting the second flange portion 5g can be easily applied as long as it is a square nut 31, but it is not limited to the square nut 31 and has an outer diameter equivalent to the inner diameter of the opening of the embedding hole 3. It may be a cylindrical member.
When the second flange portion 5 g is formed from the cylindrical member, it is possible to adopt a configuration in which a required number of protruding burr pieces or the like is provided on the outer peripheral surface of the cylindrical member to prevent it from coming off. The burr piece is a protrusion or a ridge that extends diagonally from the back side of the embedding hole 3 toward the opening side when the cylindrical member is inserted into the opening of the embedding hole 3, and is a cylindrical member. Means a member that acts as a retaining resistance when the is inserted into the opening of the embedding hole 3.
Since the hole shape of the embedding hole 3 is not particularly limited as described above, the outer shape of the second flange portion 5g fitted to the opening of the embedding hole 3 is also not particularly limited. A second flange portion 5 g having a shape that can be fitted to the embedded hole 3 having a predetermined shape can be applied.
Whichever shape is used, it is desirable that the outer circumference of the second flange portion 5g is fitted into the opening of the embedding hole 3 and positioned. When the second flange portion 5g is configured from the above-mentioned square nut 31, the square nut 31 is fitted by fitting the square nut 31 while bringing the outer peripheral corner portion 31c of the square nut 31 into contact with the opening of the embedding hole 3. The tip of the tubular body 5a can be positioned.

The material constituting the tubular main body portion 5a and the second flange portion 5g is not particularly limited, but if it is made of metal, it is preferably made of a corrosion-resistant metal material such as plated steel or stainless steel. In addition, the tubular main body portion 5a and the second flange portion 5g may be formed of either a resin such as a vinyl chloride resin or a polycarbonate resin, or a fiber reinforced resin or a ceramic. If the tubular main body portion 5a and the second flange portion 5g are made of resin, they can be provided as inexpensive parts.

Inside the embedding hole 3, the first flange portion 5d is arranged on the bottom side of the embedding hole 3, and the second flange portion 5g is embedded on the opening side of the embedding hole 3. The stopper 5 is inserted. An adhesive is filled inside the embedding hole 3 so as to surround the periphery of the embedding plug 5, and the embedding plug 5 is surrounded by an adhesive layer 6 on which the adhesive is cured. Further, the embedding plug 5 is fixed to the embedding hole 3 so that the outer end surface 31b of the square nut 31 constituting the second flange portion 5g is flush with the opening surface of the embedding hole 3. In this way, the second flange portion 5g is arranged in the embedding hole 3 so as not to protrude outward from the opening of the embedding hole 3.
The adhesive for forming the adhesive layer 6 is not particularly limited, but an epoxy-based adhesive, a urethane-based adhesive, a polyester-based resin adhesive, an acrylic-based adhesive, or the like can be used.

As shown in FIG. 2, a second flange portion 5g is installed in the opening of the embedding hole 3, and a screw hole 5f shown in FIGS. 3A and 3B is provided at the center of the second flange portion 5g. It is open. Therefore, the anti-vibration member 8 is attached to the sleeper main body 2 by screwing the mounting bolt 7 penetrating the through hole 8c of the elastic pads 8a and 8b described above into the screw hole 5f.

In the structure shown in FIG. 2, the adhesive layer 6 is formed inside the embedding hole 3, but the second flange portion 5g is driven so as to bite into the opening of the embedding hole 3, and the second flange portion 3 is formed. When the portion 5 g is firmly fixed to the opening of the embedding hole 3, the adhesive layer 6 may be omitted. Since the adhesive layer 6 is provided as an auxiliary when the bonding strength of the embedding plug 5 to the embedding hole 3 is considered to be low, the bonding strength of the second flange portion 5g to the embedding hole 3 can be increased. In some cases, it may be omitted.
If both the tubular main body portion 5a and the second flange portion 5g are made of resin in the embedding plug 5 having the above-described configuration, it is possible to provide the embedding plug 5 having a lightweight, inexpensive and simple configuration.

"Manufacturing method of pillow with embedded plug"
As shown in FIG. 3A, a resin tubular main body portion 5a and a square nut 31 are prepared, and as shown in FIG. 3B, the tubular main body portion is formed in the central hole 31a of the square nut 31. Fit the tip of 5a. At this time, the tubular body portion 5a is fitted so that the tip end portion does not protrude from the end surface 31b of the square nut 31. By this fitting, a second flange portion 5g made of a square nut 31 is formed on the tip end side of the tubular main body portion 5a. Further, it is preferable to attach a masking tape (not shown) to the end surface 31b of the square nut 31 so as to cover the central hole 31a of the square nut 31.

Next, as shown in FIG. 3C, a required amount of the adhesive 41 is injected from the container 40 containing the adhesive into the embedded holes 3 formed at the predetermined positions of the sleeper main body 2.
When injecting the adhesive 41, in order to prevent the adhesive from leaking from the embedding hole 3 when the embedding plug 5 is inserted in the next step, the volume of the embedding plug 5 is taken into consideration, for example, the embedding hole. It is desirable to inject the adhesive so as to fill about 50 to 60% of the internal volume of 3. The embedded hole 3 formed in the sleeper main body 2 is formed at an accurate position of the sleeper main body 2 by using an NC lathe or the like.

Next, before the adhesive 41 is cured, the tubular main body portion 5a is inserted into the embedding hole 3 while the first flange portion 5d is directed toward the bottom side of the embedding hole 3 as shown in FIG. 3D. Then, the second flange portion 5g is arranged on the opening side of the embedding hole 3. Since the outer diameter of the second flange portion 5g is the same as the inner diameter of the opening of the embedding hole 3 or slightly larger than the opening diameter of the embedding hole 3, the second flange portion 5g is used as the opening of the embedding hole 3. It can be fitted and fitted into the opening of the embedding hole 3 by manually fitting it into the hole 3 or by tapping it lightly from above with a hammer 43 as shown in FIG. 3 (e).
When the second flange portion 5g is fitted and fitted into the opening of the embedding hole 3, the second flange portion 5g positions the tip of the tubular main body portion 5a at the center of the opening of the embedding hole 3. Can be supported to do. Further, the central axis of the tubular main body 5a can be supported so as not to be inclined with respect to the central axis of the embedded hole 3. That is, it can be accurately positioned and supported so that the tubular main body 5a is oriented at a right angle to the upper surface 2a of the sleeper main body 2.

When the embedding plug 5 is inserted into the embedding hole 3, if the amount of the adhesive filled in the embedding hole 3 is too large, the adhesive is adhered through the gap of the opening of the embedding hole 3 around the second flange portion 5g. Leakage of the agent may occur. Here, even if the adhesive leaks out, as described above, the masking tape is attached to the end surface 31b of the square nut 31, so that the adhesive is adhered to the screw hole 5f of the tubular main body 5a. There is no risk of the agent infiltrating. If the adhesive penetrates into the screw hole 5f, there is a possibility that the mounting bolt 7 cannot be screwed as in the case described above with reference to FIG. 7.
If the masking tape is attached, it is possible to prevent the adhesive from entering the screw hole 5f even if the adhesive leaks from the embedding hole 3. If the amount of adhesive injected into the embedding hole 3 is appropriate, the adhesive does not leak, or even if it leaks, the amount is small, so that an appropriate amount of adhesive can be injected. May be carried out without applying masking tape.

The masking tape may be peeled off if there is no leakage of the adhesive after fixing the second flange portion 5 g by manual operation or with a hammer.
Alternatively, if the adhesive leaks after the adhesive is cured, it is preferable to grind the surface of the leaked portion with a sanding machine, so that it is removed at the time of grinding, or the sleeper 1 of the present embodiment is used. It should be peeled off before shipping.

In FIG. 3 (e), when the embedding plug 5 is inserted into the embedding hole 3, the internal space of the embedding hole 3 is not completely filled with the adhesive, but is slightly in the vicinity of the second flange portion 5g. It shows a state in which the adhesive is filled so as to leave a small space where the adhesive layer 6 does not exist. As shown in FIG. 3E, if the injection amount of the adhesive is underestimated and the injection work is performed, even if there is some variation due to the injection work of the adhesive, the leakage of the adhesive can be eliminated. Can be done.

When the fixing of the embedding plug 5 is emphasized, it is best to set the filling state so that the adhesive leaks to some extent from the opening of the embedding hole 3 when the embedding plug 5 is inserted into the embedding hole 3. preferable.
When there is some leakage of the adhesive from the opening of the embedding hole 3 in this way, it can be easily confirmed that the adhesive is sufficiently filled. Even if some leakage occurs in this way, the surface portion of the peripheral edge of the opening of the embedded hole 3 can be finished flat by grinding the surface of the leaked portion with the sanding machine as described above. By finishing the opening of the embedding hole 3 flat, the vibration isolator member 8 can be brought into close contact with the end surface 2b and the side surface 2c of the sleeper main body 2 when the vibration isolator member 8 is fixed.

According to the fixing structure of the embedding plug 5 using the embedding plug 5 and the adhesive layer 6 of the present embodiment, the adhesive layer 6 reliably covers most of the tubular main body portion 5a and the first flange portion 5d. As a result, a high-strength structure can be obtained as the fixed structure of the embedding plug 5. Further, when the second flange portion 5g is fitted in the opening of the embedding hole 3, the fixing strength improving effect due to this fitting force can also be obtained.
Therefore, the embedding plug 5 can be firmly fixed to the embedding hole 3 assuming that the injection amount of the adhesive is estimated to be slightly underestimated as described above based on FIG. 3 (e).

In the state shown in FIG. 3 (e), the tubular main body portion 5a is accurately positioned at the center position of the embedding hole 3 by fitting or fitting the second flange portion 5g into the opening of the embedding hole 3. Can be positioned. Further, the tubular main body 5a can be positioned at a right angle to the upper surface of the sleeper main body 2. Therefore, the mounting bolt 7 penetrating the through holes 8c of the elastic pads 8a and 8b described above can be reliably screwed into the screw holes 5f of the tubular main body 5a, and the vibration-proof member composed of the elastic pads 8a and 8b. 8 can be accurately and securely attached to the sleeper main body 2.

Next, the embedded hole 3 formed in the sleeper main body 2 is formed at an accurate position by an NC lathe or the like, and the through hole 8c formed in the elastic pads 8a and 8b is also formed at an accurate position. ing. Therefore, when the anti-vibration member 8 is mounted on the sleeper main body 2, the center position of the embedded hole 3 and the center position of the through hole 8c of the anti-vibration member 8 can be aligned with sufficiently high accuracy. is there. Further, in the present embodiment, as a result of being able to accurately align the tubular main body 5a of the embedding plug 5 with the center position of the embedding hole 3, the mounting bolt 7 is surely screwed into the screw hole 5f of the tubular main body 5a. It can be fitted, and the anti-vibration member 8 can be securely attached to the sleeper main body 2.

In addition, using synthetic pillow (Eslon Neo Lumber FFU synthetic pillow: Sekisui Chemical Co., Ltd. trade name), a resin outer diameter of 14 mm and length is used for a round hole type embedded hole with an inner diameter of 27 mm and a depth of 40 mm. An embedding plug assembled from an M16 size vinyl chloride resin hexagon nut fitted to the tip of a tubular main body with a diameter of 40 mm and an outer diameter of 16.5 mm x 16.5 mm and the tip of the tubular main body. The structure shown in FIG. 3 (e) was prepared by inserting and filling the embedding hole with an adhesive (epoxy adhesive / Eslon # 4000: Sekisui Fuller Co., Ltd. trade name) adhesive. The screw hole of the tubular main body is M8.
In this structure, when the pull-out strength of the tubular main body was measured, it showed a value of around 6.0 kN, and it was confirmed that a sufficient pull-out strength could be obtained.

"Comparison example"
4 (a) to 4 (d) assume an embedding plug 45 composed of only the tubular main body 5a, and fix the embedding plug 45 to the embedding hole 3 with an adhesive with high positioning accuracy. It is a figure explaining the comparative example process of.
As shown in FIG. 4A, an L-shaped iron angle member 46 is prepared in order to position and fix the embedding plug 45. This angle material 46 is an angle material composed of two plates 46A and 46B having a size that can be attached to the side corners of the sleeper main body 2, and when attached to the side corners of the sleeper main body 2, Two through holes 46a are formed in the plate 46A so as to be aligned with the embedded holes 5 formed in advance in the sleeper main body 2. These through holes 45a can be inserted through the shaft portion of the mounting bolt 7 screwed into the screw hole 5f of the tubular main body portion 5a, and the head portion of the mounting bolt 7 is formed to have an inner diameter that cannot be inserted.

As shown in FIGS. 4A and 4B, the mounting bolt 7 is inserted into the through holes 46a and 46 of the plate 46A and protrudes from the plate 46A in parallel along the plate material 46B to the tip end side of the mounting bolt 7. It is assumed that the embedding plug 45 composed of only the tubular main body 5a is screwed. In this screwed state, the tubular main body 5a and the mounting bolt 7 are tightly screwed so as to sandwich the plate 46A and be orthogonal to the plate 46A.
When the tubular main body 5a and the mounting bolt 7 are attached to the plate 46A, the required amount of adhesive 47 is injected from the container 48 into the embedding hole 3 of the sleeper main body 2 as shown in FIG. 4 (c). ..
Next, the angle member 46 is installed along the corner portion of the sleeper main body 2 while aligning the tubular main body 5a with respect to the embedding hole 3.

As shown in FIG. 4D, the tubular main body portion 5a can be inserted into the embedding hole 3 by using the angle member 46 as a ruler for alignment.
When the tubular main body 5a is inserted into the embedding hole 3, the embedding plug 45 composed of only the tubular main body 5a can be attached to the sleeper main body 2 by solidifying the adhesive.
When the adhesive has solidified, the mounting bolt 7 is rotated to remove the mounting bolt 7 from the screw hole 5f of the tubular main body 5a, and the plate 46 is removed from the sleeper main body 2 to remove the inside of the embedded hole 3. A structure in which the embedding plug 45 is fixed can be obtained.

The embedding plug 45 can be fixed to the embedding hole 3 by using the angle member 46 according to the steps of the comparative examples shown in FIGS. 4 (a) to 4 (d). There are various problems when carrying out the steps of the comparative examples shown.
First, a large-scale metal jig called an angle member 46, which has a large weight, is required, which causes a problem in workability. Next, when the angle member 46 is installed at which position of the sleeper main body 2, there is a problem that it is not possible to visually confirm whether the tubular main body 5a is accurately aligned with the center of the embedding hole 3.
Therefore, it is necessary to draw a mark for alignment of the angle member 46 on the sleeper main body 2 to determine at which position of the sleeper main body 2 the angle member 46 should be installed for accurate alignment. In some cases, it is necessary to manually correct the alignment of the angle member 46 in mm units, and the alignment work is not easy.

Next, assuming that the angle member 46 can be accurately aligned, it is not possible to visually confirm whether or not the adhesive has leaked from the embedding hole 3 due to the large amount of the adhesive injected.
It is necessary to apply a mold release material or the like in consideration of the case where the adhesive leaks out and the angle material 46 is adhered to the sleeper main body 2. If the release material is forgotten to be applied, the adhered angle material 46 cannot be removed from the sleeper main body 2, and if it is forcibly removed, the embedding plug 45 fixed with the adhesive is embedded together with the angle material 46. It may be pulled out from the hole 3.
As described above, when the embedding plug 45 is attached by using the angle member 46 like a positioning jig, various problems may occur.

In these points, based on the method described above based on FIGS. 3 (a) to 3 (e) using the embedding plug 5 provided with the tubular main body portion 5a and the second flange portion 5g described above. , If the sleeper 1 is manufactured, it is possible to provide a sleeper manufacturing method capable of solving all the above-mentioned problems.

First, it is embedded by a simple structure in which a second flange portion 5 g made of a square nut 31 is provided on the tubular main body portion 5a without using a large-scale heavy jig such as an angle member 46. The work of attaching the stopper 5 to the embedded hole 3 can be realized. Further, the tubular main body portion 5a can be installed while being aligned with the center of the embedding hole 3 by a simple operation of fitting the second flange portion 5g into the opening of the embedding hole 3 or driving it. Can be done.

When the second flange portion 5 g is fitted into or driven into the opening of the embedding hole 3, even if the adhesive leaks, the operator can easily visually confirm the leak and leaks. With respect to the adhesive that has been taken out, it is possible to prevent the adhesive from entering the screw hole 5f by a simple operation of attaching a masking tape to the outer surface side of the second flange portion 5g.
Since the second flange portion 5g can be left inside the embedding hole 3 as a part of the embedding plug 5, it is not necessary to remove the member used for positioning after construction. Further, if a sufficient amount of adhesive is filled inside the embedding hole 3, the second flange portion 5g can be fitted into the opening of the embedding hole 3, and further fixed by the adhesive layer 6. It also plays a role of reinforcing the opening of the embedding hole 3 because the state is changed.

A mounting bolt 7 for fixing the anti-vibration member 8 is screwed into the embedding plug 5, but vibration and impact during vehicle running repeatedly act on the anti-vibration member 8 fixed to the sleeper main body 2. However, even if these vibrations and shocks repeatedly act, the opening of the embedded hole 3 is reinforced by the second flange portion 5 g and the adhesive, so that the structure of the mounting portion of the vibration isolator member 8 is strong. Can provide structure.

In the embodiment described above, the embodiment in which the embedding plug 5 is provided in the mounting portion of the vibration isolator member 8 has been described, but the structure in which the embedding plug 5 is fixed to the embedding hole 3 has various other mounting portions. It can be applied to.
For example, in the structure of the sleeper 1 shown in FIG. 1, it can be applied to a structure in which a fixing bolt 15 is screwed and fixed to the upper surface 2a of the sleeper main body 2. When an embedding hole is formed in the upper surface 2a of the sleeper main body 2 and an embedding plug 5 composed of a metal tubular main body 5a and a square nut 31 is embedded and fixed in the embedding hole, the tubular main body is formed. The fixing bolt 15 can be screwed into the screw hole 5f of the portion 5a, and the structure of the above embodiment can be applied to the structure of the mounting portion of the tie plate 12.

1 ... sleeper, 2 ... sleeper body, 3 ... embedding hole, 5 ... embedding plug, 5a ... tubular body, 5b ... bottom wall, 5d ... first rail, 5g ... second rail Parts, 5f ... Screw holes, 6 ... Adhesive layer, 7 ... Mounting bolts (mounting brackets), 8 ... Anti-vibration members, 8a ... End elastic pads, 8b ... Side elastic pads, 8c ... Through holes, 10 ... Rails, 11 ... Rails, 12 ... Typrates, 31 ... Square nuts, 41 ... Adhesives.

Claims (7)

A sleeper main body having an embedding hole and an embedding plug embedded in the embedding hole are provided.
The embedding plug includes a tubular main body portion, a first flange portion provided on the base end portion side of the tubular main body portion, and a second flange portion provided on the tip end portion side of the tubular main body portion. Has a part
A sleeper with an embedding plug, wherein the first flange portion is arranged on the bottom side of the embedding hole, and at least a part of the outer peripheral surface of the second flange portion is in contact with the inner peripheral surface of the embedding hole. Gi. The sleeper with an embedding plug according to claim 1, wherein an adhesive layer is provided around the embedding plug arranged in the embedding hole. Claim 1 or claim 2 in which a screw hole is formed in the tubular main body portion to be opened on the tip end side of the tubular main body portion, and the tip opening portion of the screw hole is exposed in the opening of the embedded hole. Sleepers with embedded plugs described in. The embedding plug is made of a resin tubular body portion in which the first flange portion is integrally molded, and a resin tubular body portion that is extrapolated to the tip portion of the tubular main body portion to form the second flange portion. The brim with an embedding plug according to any one of claims 1 to 3, which is provided with a square nut. A plurality of the embedded holes are formed at the end of the sleeper main body, a vibration isolator is attached to the end of the sleeper main body, and a through hole formed in the vibration isolator is inserted through the sleeper main body. The sleeper with an embedding plug according to any one of claims 1 to 4, wherein the anti-vibration member is fixed to the sleeper by a mounting bracket joined to the embedding plug. The process of filling the embedded holes provided in the sleeper body with adhesive,
In the embedding hole, a tubular main body portion, a first flange portion provided at the base end portion of the tubular main body portion, and a second flange portion provided at the tip end portion of the tubular main body portion are provided. In arranging the embedding plug to have
A pillow with an embedding plug having a step of inserting the first flange portion into the bottom side of the embedding hole and inserting the second flange portion so as to be in contact with the inner peripheral surface of the opening of the embedding hole. Production method. The tubular main body is made of a resin molded product obtained by integrally molding the first flange, and is a resin square mold that is extrapolated to the tip of the tubular main body to form the second flange. The method for manufacturing a brim with an embedding plug according to claim 6, wherein the embedding plug provided with a nut is used.

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