JP4912734B2 - Embedded plug and method for embedding embedded plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an embedded plug which can be easily and accurately inserted into an embedding hole provided in a sleeper or a concrete slab. <P>SOLUTION: This embedded plug comprises a cylindrical body 2, and annular member 3 which are mounted at the outside upper and outside lower ends of the cylindrical body 2, respectively. A female screw 4 is formed in the inside surface of the cylindrical body 2; a lower end surface of the cylindrical body 2 is closed; and a plurality of protrusions of the same shape are formed at circumferentially regular intervals on the outside surface of the annular member 3. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an embedding plug used for fixing a member such as a tie plate of a railroad track to a support member such as a sleeper or a concrete slab and an embedding method thereof.

  Conventionally, as a device for fixing a member such as a rail holding tie plate of a railroad track to a support member such as a sleeper or a concrete slab, an embedded plug having a female screw hole for screwing is embedded in the support member. There is known a fixing device having a structure in which a rail holding tie plate is placed on an upper surface via an insulating pad and a fastening bolt inserted through the tie plate and the insulating pad is screwed into the embedded plug.

  For example, as this type of embedding plug, one shown in FIG. 5 is known. In FIG. 5, 21 is a concrete sleeper, 22 is an embedding plug, 23 is an embedding hole, 24 is an insulating pad, 25 is a tie plate, 26 is a track pad, 27 is a rail, 28 is a fastening bolt, and 29 is a spring washer. It is.

  Conventionally, the inner diameter of the embedding hole for embedding the embedding plug is made 3 to 5 mm larger than the outer diameter of the embedding plug, and a liquid adhesive is poured into the gap between the outer surface of the embedding plug and the embedding hole forming wall surface, There are many types in which the embedded plug is fixed by curing the adhesive. However, if the inner diameter of the embedding hole is larger than the outer diameter of the embedding plug, it is difficult to insert the embedding plug accurately into the embedding hole (so that the center of the embedding plug and the center of the embedding hole coincide). In addition, even if it can be inserted accurately, it takes a considerable amount of time (about several hours at room temperature) for the adhesive to harden to a practical hardness, so it is difficult to maintain the initial insertion state of the embedded plug. There's a problem.

  The present invention has been made in view of such problems of the prior art, and the object thereof is to embed which can be easily inserted accurately into an embedding hole provided in a sleeper or a concrete slab. To provide a stopper. Moreover, the objective of this invention is providing the method of embedding the embedding stopper in the embedding hole provided in the sleeper or the concrete slab.

  In order to achieve the above object, an embedding plug of the present invention comprises a cylindrical body and an annular member attached to an outer upper end and an outer lower end of the cylindrical body, and an inner surface of the cylindrical body. Is formed with a female screw and the lower end surface of the cylindrical body is closed, and the outer surface of the annular member is formed with a plurality of protrusions in the circumferential direction.

  For the reasons described later, it is preferable that the protrusions have the same shape.

  Moreover, although the projection part consists of several projection groups and the shape of the projection part which comprises each projection group is the same, the projection part shape of a different projection group may differ.

  The protrusions are preferably formed at equal intervals in the circumferential direction.

  For the reason described later, the annular member is preferably made of resin.

  Further, the embedding method of the embedding plug of the present invention, which is constituted by a cylindrical body and an annular member and has the above-described features, has an inner diameter slightly smaller than the outer diameter of the embedding plug including a protrusion on a sleeper or a concrete slab. An embedding hole is provided in the vertical direction, and then an embedding plug is press-fitted into the embedding hole, and a paste adhesive is poured into the gap between the outer surface of the cylindrical body and the wall surface forming the embedding hole. It is characterized by that.

  Furthermore, another embedding method of the embedding plug according to the present invention, which is constituted by a cylindrical body and an annular member and has the above-described characteristics, is slightly smaller than the outer diameter of the embedding plug including a protrusion on a sleeper or a concrete slab. An embedding hole having an inner diameter is provided in the vertical direction, a paste-like adhesive is then poured into the embedding hole, and an embedding plug is press-fitted into the embedding hole.

Since this invention is comprised as mentioned above, there exists the following effect.
(1) According to the embedded plug of the first aspect, the annular member is attached to the outer upper end portion and the outer lower end portion of the cylindrical body, and a plurality of protrusions are provided circumferentially on the outer surface of the annular member. Since it is formed, the protrusion acts to hold the cylindrical body by pulling it against the embedding hole, so that the center of the embedding plug and the center of the embedding hole are easily aligned. In this case, as described in claim 2, it is preferable that the protrusions have the same shape, since the tension effect is easily exerted evenly, and the center of the embedded plug and the center of the embedded hole are more easily matched. As described in claim 3, the protrusions are composed of a plurality of protrusion groups, and the protrusions constituting each protrusion group have the same shape, but the protrusions are different even if the protrusion portions of different protrusion groups are different. The effect can be expected. If the projections are formed at equal intervals in the circumferential direction as described in claim 4, the tension effect is maximized, and the center of the embedded plug and the center of the embedded hole easily coincide. I can expect that.
(2) According to the embedded plug of the fifth aspect, the protrusion formed on the outside of the annular member is elastically deformed according to the shape of the embedded hole when the embedded plug is press-fitted into the embedded hole. The press-fitting of the embedded plug can be relatively easy.
(3) The embedding method according to claims 6 and 7 can provide a method suitable as an embedding method of the embedding plug. In particular, when the viscosity of the paste-like adhesive is high, it takes a little time to pour the paste-like adhesive into the narrow gap when the embedding plug is first pressed into the embedding hole. After the paste-like adhesive is poured into the embedding hole, the embedding plug is press-fitted into the embedding hole, and the operation of removing excess adhesive overflowing at the upper portion can be facilitated.

  An internal thread is formed on the inner surface of the cylindrical body to be screwed with the fastening bolt, and the lower end surface of the cylindrical body is closed to prevent the paste-like adhesive for fixing the embedded plug from entering. The material of the cylindrical body is not particularly limited and may be made of metal, but plastics such as polyethylene, polypropylene, polyamide, and fiber reinforced plastic can be used. In addition, what does not melt | dissolve in the paste-form adhesive to be used is preferable.

  The material of the annular member attached to the outer upper end and the outer lower end of the cylindrical body is not limited, but has elasticity so that it can be easily press-fitted into the embedding hole, and has electrical insulation properties. Therefore, it is possible to employ foamed plastic as the material of the cylindrical body. For example, as the annular member, polystyrene foam, polyethylene foam, polypropylene foam, vinyl chloride foam, viscose sponge, rubber foam, EVA foam, ABS foam, polyamide foam, acrylic foam, or other thermoplastic resin foam, urethane foam, phenol Thermosetting resin foams such as foam, urea foam, silicon foam, and epoxy foam can be used, but those that do not dissolve in the paste adhesive used are preferred.

  As means for mounting the annular member on the cylindrical body, for example, an adhesive can be used.

  The shape of the protrusion formed on the outer surface of the annular member is not limited, and various shapes such as a rectangular shape and a trapezoidal shape can be employed.

  Further, the number of the plurality of protrusions can be selected as necessary. This protrusion has the function of holding and holding the cylindrical body against the embedded hole and the centering function (the function of aligning the center of the embedded hole and the center of the embedded plug), so that the protruding effect of the protrusion is sufficient In order to achieve this, the inner diameter of the embedding hole is preferably slightly smaller than the outer diameter of the embedding plug including the protrusion. Specifically, the sum of the thickness of the annular member and the height of the protruding portion may be not less than W and not more than 2 W when the difference between the inner diameter of the embedding hole and the diameter of the cylindrical body is 2 W. preferable. As an example of specific numerical values, the inner diameter of the embedding hole is smaller by about 3.0 to 4.0 mm than the outer diameter of the embedding plug. If the inner diameter of the embedding hole is too smaller than the outer diameter of the embedding plug, it is difficult to press-fit the embedding plug into the embedding hole. The difference between the inner diameter of the embedding hole and the outer diameter of the embedding plug can be appropriately selected depending on the material of the annular member.

  It is preferable that a groove is formed on the outer surface of the cylindrical body along the longitudinal direction. The embedding plug is generally fixed by a paste-like adhesive poured between the outer surface of the embedding plug and the wall surface for forming the embedding hole, but air can be entrained in the paste-like adhesive. is there. In that case, the embedding plug may float due to the air until the adhesive is cured. Further, if air remains in the adhesive, the bonding force may be reduced. Since air tends to pass through a wider cross-sectional area with less resistance, if a groove is formed along the longitudinal direction on the outer surface of the cylindrical body, this groove becomes a passage for the air, and in the adhesive. Air easily escapes upward through this groove. As a result, the embedded plug does not float up until the adhesive is cured, and the bonding force does not decrease. This type of paste-like adhesive does not contain volatile solvents, hardly shrinks even after curing, does not crack even if the adhesive layer is large, and does not decrease adhesive strength for a long time Although it is preferable to use a system adhesive, it is not limited to this.

  Examples of the present invention will be described below. However, the present invention is not limited to the following examples, and can be appropriately changed and modified without departing from the technical scope of the present invention.

  FIG. 1A is a front view including a cross-section of an embedded plug 1 of the present invention. The embedded plug 1 includes a cylindrical body 2 made of low carbon steel, an outer upper end portion and an outer lower end portion of the cylindrical body 2. It is comprised from the cyclic | annular member 3 of the polyethylene foam mounted | worn with the adhesive agent. An internal thread 4 is formed on the inner surface of the cylindrical body 2. FIG. 1B is a front view of the cylindrical body 2, and the female screw 4 is formed over the entire length from the upper end 2 a to the lower end 2 b, leaving a part on the lower end 2 b side. FIG.1 (c) is a bottom view of the cylindrical body 2 which shows a lower end surface, and the lower end surface of the cylindrical body 2 is closed.

  2A is an enlarged plan view showing the annular member 3, and FIG. 2B is a side view thereof. The outer surface of the annular member 3 is spaced 3 from the circumferential direction with an equal interval D therebetween. A plurality of protrusions 5 having the same shape are formed. Although the protrusion 5 has a rectangular cross section and a vertical cross section, it is needless to say that protrusions having various shapes can be adopted and the number of protrusions is not limited to three.

  FIG. 3 shows a case where the groove 8 is formed along the longitudinal direction of the outer surface of the cylindrical body 7 made of low carbon steel constituting the embedded plug 6, and FIG. FIG. 3B is a plan view of the embedded plug 6. Although the cross section of the groove 8 is semicircular, it is needless to say that a groove having another cross sectional shape can be adopted as long as it can function as a passage for air entrained in the paste adhesive.

  FIG. 4 is a view for explaining a method of embedding the embedded plug 1 configured as described above in the concrete sleeper 9 and a method of fastening a fastening bolt to the embedded plug 1.

  First, an embedding hole 10 having an inner diameter slightly smaller (3.0 mm smaller) than the outer diameter of the embedding plug 1 is provided in the concrete sleeper 9 in the vertical direction. Next, the embedded plug 1 is press-fitted into the embedded hole 10. Further, a paste-like adhesive is poured into the gap between the outer side surface of the cylindrical body 2 and the wall surface 11 forming the embedding hole 10. When the paste adhesive is cured, the embedding of the embedding plug 1 is completed.

  Next, the insulating pad 13 having the long hole 12 is placed on the concrete sleeper 9, and the tie plate 14 having the long hole 12 is placed on the insulating pad 13, and the fastening bolt 15 is attached to the long hole 12. Then, it is inserted into the embedded plug 1 and the male screw 16 of the fastening bolt 15 is screwed with the female screw of the embedded plug 1. Reference numeral 17 is a washer, and 18 is a spring washer. It is also possible to partially change the above-described work order and press the embedded plug 1 into the embedded hole 10 after pouring the paste adhesive into the embedded hole 10.

1A is a front view including a cross section of an embodiment of the embedding plug of the present invention, FIG. 1B is a front view of a cylindrical body, and FIG. 1C is a bottom view of the cylindrical body. . 2A is an enlarged plan view showing the annular member, and FIG. 2B is a side view thereof. FIG. 3 (a) is a front view of another embodiment of the embedding plug of the present invention, and FIG. 3 (b) is a plan view thereof. It is a figure explaining the method of embedding an embedded plug in a concrete sleeper, and the method of fastening a fastening bolt to an embedded plug. It is a side view including the cross section which shows the use condition of the conventional embedded stopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Embedded plug 2 Cylindrical body 3 Ring member 4 Female screw 5 Protrusion part 6 Embedded plug 7 Cylindrical body 8 Groove 9 Concrete sleeper 10 Embedded hole 11 Wall surface 12 Long hole 13 Insulation pad 14 Tie plate 15 Fastening bolt 16 Male screw 17 Washer 18 Spring washer

Claims (7)

An embedding plug embedded in an embedding hole provided in a sleeper or a concrete slab, wherein the embedding plug includes a cylindrical body, and annular members mounted on an outer upper end portion and an outer lower end portion of the cylindrical body. The inner surface of the cylindrical body is formed with an internal thread and the lower end surface of the cylindrical body is closed, and a plurality of protrusions are formed in the circumferential direction on the outer surface of the annular member. An embedded plug characterized by being made. 2. The plug according to claim 1, wherein the protrusions have the same shape. 3. The embedding plug according to claim 1, wherein the protrusions are composed of a plurality of protrusion groups, and the protrusions constituting each protrusion group have the same shape, but the protrusions of the different protrusion groups have different shapes. . 4. The embedding plug according to claim 1, wherein the protrusions are formed at equal intervals in the circumferential direction. The embedded plug according to claim 1, 2, 3, or 4, wherein the annular member is made of resin. A method of embedding an embedding plug according to claim 1, 2, 3, 4 or 5 in a sleeper or a concrete slab,
An embedding hole having an inner diameter slightly smaller than the outer diameter of the embedding plug including the protrusion is provided in the sleeper or concrete slab in the vertical direction, and then the embedding plug is press-fitted into the embedding hole. A method of embedding an embedding plug, characterized by pouring a paste-like adhesive into a gap between an outer surface of a body and a wall surface forming an embedding hole. A method of embedding an embedding plug according to claim 1, 2, 3, 4 or 5 in a sleeper or a concrete slab,
An embedding hole having an inner diameter slightly smaller than the outer diameter of the embedding plug including the protrusion is provided in the sleeper or the concrete slab in the vertical direction, and then a paste-like adhesive is poured into the embedding hole. A method of embedding an embedding plug, wherein the embedding plug is press-fitted into the embedding hole.

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