JPH11293601A - Tie plug for prestressed concrete tie, manufacture of prestressed concrete tie using it, and prestressed concrete tie - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a rail spike for fixing a rail to a prestressed concrete tie and to dispense with a special rail fastening device. SOLUTION: A tie plug 2 comprises a fitting solid member of an approximately square pipe formed by alternately piling a plurality of two different sizes of thin rectangular parallelepiped parts 4, 5 and foam hardening resin reinforced by glass fibers 6. Grooves 7 are formed on the outer circumferential surface by using two different sizes of the thin rectangular parallelepiped parts 4, 5 in order to make ridges on the outer surface. The glass fibers 6 are molded together with the foam hardening resin so as to indicate approximately isotropy in the plane vertical to the direction of the axis of the tie plug 2 as a driving direction of a rail spike 8. In manufacturing a PC tie a piano wire for prestressing is positioned in a form so as to put a stress, and then concrete is poured and hardened after setting the tie plug 2 in the form. A rail spike 8 is driven into the tie plug 2 as well as a wooden tie for fixing a rail.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedding plug for a prestressed concrete sleeper for a railway track, a method of manufacturing a prestressed concrete sleeper using the same, and a prestressed concrete sleeper.

[0002]

2. Description of the Related Art As sleepers for railway tracks and the like, besides wooden sleepers, iron sleepers, synthetic sleepers, etc., prestressed concrete sleepers (hereinafter referred to as PC sleepers). .) Is also used for a relatively long time. PC sleepers are designed to apply a compressive force to concrete, which is strong in compression but weak in tension, to cancel the tensile load when train load is applied. Before the concrete is driven, a predetermined tension is applied to the PC steel wire in the formwork, the tension is released after the concrete is driven and hardened, and the compressive force ( Prestressing is widely used.

[0003] This PC sleeper has no corrosion or decay,
It has advantages such as long service life, heavy and stable, high buckling resistance (suitable for long rails), low progression of track deviation and reduction of maintenance cost, but price is low. Besides the fact that the electrical insulation is poor compared to wooden sleepers, etc.In addition, it is not possible to fix the rails by driving a dog nail into hardened concrete like a wooden sleeper. It is difficult to design, and such a rail fastening device or its mounting seat must be integrated at the time of manufacturing, which has a drawback that the manufacturing process becomes very troublesome.

[0004] The present invention has been made in view of such conventional problems,
An embedding plug for a prestressed concrete sleeper, a method of manufacturing a prestressed concrete sleeper using the same, and a prestressed concrete sleeper using the dog nail, which can use a dog nail for fixing the rail, so that a special rail fastening device is not required. With the goal.

[0005]

According to the first aspect of the present invention, there is provided an embedding plug for a prestressed concrete sleeper according to the present invention. It is made of a foam-hardening resin reinforced with glass fiber so as to have a substantially isotropic property in a plane perpendicular to the dog nail, and has a solid cylindrical shape to be embedded in the area where the dog nail is driven and in the vicinity thereof. Features.

According to a second aspect of the present invention, the outer peripheral side surface portion has a groove portion.

A third aspect of the present invention is characterized in that the upper surface of the prestressed concrete sleeper has a truncated conical shape.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a prestressed concrete sleeper according to the first to third aspects of the present invention, wherein a prestressed piano wire is disposed on a forming mold to achieve the above object. The embedding plug is set at a predetermined position, and concrete is poured into the mold to be hardened.

A prestressed concrete sleeper according to a fifth aspect of the present invention is characterized in that the plug according to any one of the first to third aspects is buried by the method according to the fourth aspect.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of an embedding plug for a prestressed concrete sleeper according to the present invention, and FIG. 2 is a sectional view of the same. A prestressed concrete sleeper (hereinafter referred to as a PC sleeper) 1 of the present embodiment has an embedding plug 2 embedded in a PC sleeper body 3. Note that FIG. 1 does not show the entire PC sleeper 1, and the necessary number of embedded plugs 2 is embedded as needed.

In the example shown in the figure, the embedding stopper 2 is a solid member having a cylindrical shape as a whole, in which thin rectangular parallelepiped portions 4 and 5 having different sizes are alternately stacked in a plurality of stages. The groove 7 is formed by a step formed on the outer peripheral side surface due to the difference in the size of the rectangular parallelepiped portions 4 and 5 made of a curable resin. The glass fiber 6 is substantially isotropic in a plane perpendicular to the axial direction of the embedding plug 2 in which the dog nail 8 is driven, that is, in a plane parallel to the upper surface shown in FIG. Molded with foam-setting resin,
For example, a hard urethane foam resin reinforced with a glass continuous strand mat. The glass continuous strand mat is formed by swirling a continuous glass continuous fiber strand to which an adhesive has been previously attached, as disclosed in Japanese Utility Model Publication No. 43-234, for example, so that the direction of the continuous fiber has little orientation. Progress while shaking in a certain pattern such as shape, join the contact parts of the strands,
The mat is formed into a mat having a constant thickness, and various patterns can be obtained by a combination of the manner in which the strand is swung and the traveling speed. There is little difference in physical properties such as tensile strength in any direction in the plane direction of the mat. It is also possible to use a glass chopped strand mat instead of a glass continuous strand mat. It should be noted that various known materials for the method of molding the glass curable resin reinforced with the material of the glass fiber and the foaming effect resin and the glass fiber,
Since a method exists, an appropriate method may be adopted. Further, the shape and number of the grooves 7 are not limited to the illustrated example.

PC using embedded plug 2 of this embodiment
The manufacturing process of the sleeper 1 will be described. First, a prestressing piano wire is arranged on a molding frame to give a predetermined tension, and then the embedding plug 2 is set at a predetermined position in the molding frame by an appropriate means. The upper surface of the embedding plug 2 is of course set so as to be exposed on the upper surface of the PC sleeper 1. Then, concrete is poured into the form and hardened, and the tension applied to the piano wire is released, and a compressive force (prestress) is given by the adhesive force of the piano wire. Since the concrete enters the groove 7, the embedding plug 2 is firmly fixed in the PC sleeper body 3 and does not come off.

[0013] The fixing of the rail at the site where the rail is laid can be achieved only by driving the dog nail 8 into the embedding plug 2.
It is the same as rail fixing with conventional wooden sleepers. Since the embedding plug 2 is isotropic, even if the dog nail 8 is driven, not only is it hard to be broken but also it is difficult to form a gap, and the isotropic nature of the glass fiber 6 increases the dog nail pull-out resistance.

FIG. 3 is a sectional view showing another embodiment of the prestressed concrete sleeper according to the present invention.
The PC sleeper 10 of the present embodiment differs from the previous embodiment in that the embedding plug 2 has a length that penetrates the sleeper body 3. The manufacturing process of the PC sleeper using the embedding plug 10 of this embodiment is the same as that of the first embodiment, and the description is omitted.

FIGS. 4A to 4C are perspective views showing still another embodiment of the embedding plug for a prestressed concrete sleeper according to the present invention. The embedding plug 11 shown in FIG. 4A has thin frusto-conical portions 12a having different diameters.
13a, 12b, 13b, 12c, 13c, and 12d are stacked in a plurality of stages to form a groove 7 so as to form a tapered shape in which the upper surface side of the PC sleeper is widened. Further, the embedding plug 14 of FIG. 4B is formed by alternately stacking two types of thin frustoconical portions 15 and 16 having different diameters in a plurality of stages to form the groove 7. Further, the embedding plug 17 of FIG. 4 (C) has a groove 7 formed in a female screw shape on the outer peripheral surface of the cylinder. The embedding stoppers 11, 14, 1 of these embodiments
The manufacturing process of the PC sleeper using the PC sleeper 7 is the same as that of the first embodiment.

In the plugs of any of the embodiments described above, the specific gravity is 0.5 to 0. 0 due to the relationship with PC sleepers commonly used concrete.
8. The glass content is preferably 30 to 50%.

[0017]

The embedding plug for a prestressed concrete sleeper according to the present invention, as described above,
It is made of a foam-hardening resin reinforced with glass fiber so as to have substantially isotropic properties in at least a plane perpendicular to the direction in which the dog nail is driven into the prestressed concrete sleeper. Since it has a solid cylindrical shape to be buried, the rail can be fixed only by driving a dog nail, and there is an effect that a rail fastening device and a mounting seat for the rail, which are conventionally required, are not required.

The method for producing a prestressed concrete sleeper according to the present invention, as described above,
After arranging the piano wire for prestress on the mold for molding,
Since the embedding stopper according to any one of claims 1 to 3 is set at a predetermined position and concrete is poured into the form and hardened, a conventional rail fastening device or a mounting seat thereof is required. There is an effect that it can be manufactured in a very simple process at a low cost as compared with the manufacturing method.

Further, as described above, the prestressed concrete sleeper according to the present invention has the embedded plug manufactured by the above-described manufacturing method embedded therein, so that the rail is fixed only by driving the dog nail. This eliminates the need for a rail fastening device and a mounting seat for the rail fastening device, and thus has the effect of reducing costs.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an embedding plug for a prestressed concrete sleeper according to the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a sectional view showing another embodiment of the prestressed concrete sleeper according to the present invention.

FIG. 4 is a perspective view showing still another embodiment of the embedding plug for prestressed concrete sleepers according to the present invention.

[Explanation of symbols]

1, 10 PC sleepers (prestressed concrete sleepers) 2, 11, 14, 17 Embedding stoppers 3 PC sleeper main body 4, 5 rectangular parallelepiped part 6 glass fiber 7 groove 8 dog nails 12a to 12d, 13a to 13c, 15, 16 Frustoconical part

[Procedure amendment]

[Submission date] May 26, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

In the example shown in the figure, the embedding stopper 2 is a solid member having a cylindrical shape as a whole, in which thin rectangular parallelepiped portions 4 and 5 having different sizes are alternately stacked in a plurality of stages. The groove 7 is formed by a step formed on the outer peripheral side surface due to the difference in the size of the rectangular parallelepiped portions 4 and 5 made of a curable resin. The glass fiber 6 is substantially isotropic in a plane perpendicular to the axial direction of the embedding plug 2 in which the dog nail 8 is driven, that is, in a plane parallel to the upper surface shown in FIG. Molded with foam-setting resin,
For example, a hard urethane foam resin reinforced with a glass continuous strand mat. The glass continuous strand mat is formed by swirling a continuous glass continuous fiber strand to which an adhesive has been previously attached, as disclosed in Japanese Utility Model Publication No. 43-234, for example, so that the direction of the continuous fiber has little orientation. Progress while shaking in a certain pattern such as shape, join the contact parts of the strands,
The mat is formed into a mat having a constant thickness, and various patterns can be obtained by a combination of the manner in which the strand is swung and the traveling speed. There is little difference in physical properties such as tensile strength in any direction in the plane direction of the mat. It is also possible to use a glass chopped strand mat instead of a glass continuous strand mat. It should be noted that various known materials are used for the method of forming the glass curable resin reinforced with the material of the glass fiber or the foam curable resin and the glass fiber,
Since a method exists, an appropriate method may be adopted. Further, the shape and number of the grooves 7 are not limited to the illustrated example.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoho Tozaki 1-1-18-1, Nishiarai Sakaemachi, Adachi-ku, Tokyo Nisshin Spinning Co., Ltd. Tokyo Plant (72) Inventor Kunio Iwasaki Nishinakajima, Yodogawa-ku, Osaka-shi, Osaka 7-16-76 Chuo PS Co., Ltd.

Claims (5)

[Claims] 1. A method for driving a dog nail, comprising a foam-hardening resin reinforced with glass fiber so as to have a substantially isotropic property at least in a plane perpendicular to a direction in which the dog nail is driven into the prestressed concrete sleeper. An embedding plug for a prestressed concrete sleeper having a solid cylindrical shape to be embedded in a part and a part in the vicinity thereof. 2. An embedding plug for a prestressed concrete sleeper according to claim 1, wherein said embedding groove has a groove-like portion on an outer peripheral side surface portion. 3. The embedding plug for a prestressed concrete sleeper according to claim 1, wherein the prestressed concrete sleeper has a truncated cone shape in which the upper surface side is widened. 4. After arranging a prestressing piano wire on a forming mold, setting the embedding plug according to claim 1 at a predetermined position, and pouring concrete into the forming form. A method for producing a prestressed concrete sleeper, which is cured. 5. A prestressed concrete sleeper, wherein the plug according to claim 1 is buried by the method according to claim 4.