JP2002348801A - Synthetic sleeper connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic sleeper connecting structure which dispenses with metallic members for ensuring connecting strength, ensures sufficient bending strength even at a location where the bending strength is the minimum, and is available in a concrete slab track. SOLUTION: The synthetic sleeper connecting structure is implemented by abutting longitudinal ends of respective synthetic sleepers 1a, 1b on each other to bond the same together. According to the structure, connecting portions 2a, 2b of the respective synthetic sleepers 1a, 1b have mutually complementary connecting ends, and the connecting portions 2a, 2b are longitudinally extended over a predetermined length from their ends, respectively. Then, a reinforcing plate 3 is arranged at least on one of upper and lower surfaces, and both side surfaces of each of the synthetic sleepers 1a, 1b, which plate is then bonded to a surface of the other sleeper 1b, 1a facing thereto. Further, a lower surface of the reinforcing plate 3 is rendered flush with the lower surface of each of the synthetic sleepers 1a, 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure and a connecting method of a synthetic sleeper for obtaining a long sleeper used for a branch portion of a railway track or the like, and more particularly, to a connecting structure of a resin reinforced with a long fiber. The present invention relates to a connection structure of a so-called synthetic sleeper made of synthetic wood.

[0002]

2. Description of the Related Art Generally, at a branch portion of a railway track,
Type of branch (single-sided branch, double-sided branch, split branch, jump-over branch, double branch, three branch, three-wire branch, diamond crossing, shisa crossing, etc.)
A long sleeper as long as 6 to 9 m is required, depending on the situation.

However, in an overcrowded urban area, an elevated section, or a place surrounded by a soundproof wall, if the above-mentioned long sleepers of 6 to 9 m are integrally treated, workability is inevitably reduced. Replacement work becomes extremely difficult.

[0004] Therefore, since the old days, the ends of the sleepers are abutted, and this portion is sandwiched from above and below or from the left and right sides by an iron plate having a bolt insertion hole, and the iron plate and the sleeper are inserted and fastened with bolt nuts. Is used.

The applicant of the present application manufactures and sells a sleeper made of synthetic wood made of a thermosetting resin foam reinforced with long fibers instead of a general-purpose beechwood or the like. Various improvements have been made so far so as to obtain excellent bending strength (for example, JP-A-6-248604, JP-A-6-240).
601 and JP-A-5-98601 and JP-A-5-98601
-51901 and JP-A-4-149302).

However, in the case of the conventional connection structure of these composite sleepers, there is a large difference in bending strength depending on the position in the longitudinal direction of the composite sleeper. Therefore, there is an inconvenience that the connecting portion between the composite sleepers must be positioned at the site for each individual sleeper, and if the positioning is not performed in this manner, insufficient strength may be concerned.

In order to improve such a problem, the present applicant has already proposed a technique disclosed in Japanese Patent No. 2809997. According to the connection structure of the synthetic sleeper, the synthetic sleepers can be connected to each other with a sufficient bending strength comparable to the original bending strength of the solid synthetic sleepers, and the bending stress is applied to the joint portion where the strength is insufficient. In this case, sufficient bending strength can be exhibited even when bending stress is applied from both upper and lower directions. Therefore, when laying a long sleeper having such a structure, there is an advantage that the construction can be performed without troublesome positioning of each sleeper on site so that the track does not overlap the joint.

[0008]

However, in the connection structure disclosed in Japanese Patent No. 2809997, the metal bolts and washers are exposed on the upper surface of the connection portion, and the tie plate and the like are fixed to the sleeper. It interferes with driving nails and dog nails. In particular, it is desirable that the attachment position of the tie plate for each sleeper is not constant in a sea crossing or the like, and that a screw nail or the like can be driven into an arbitrary position on the site.

[0009] In some cases, such as a slab track, a sleeper is laid directly on concrete, and if a connecting member or a reinforcing plate protrudes from the lower surface of the sleeper, there is a serious problem in construction. Further, even if the connecting member or the reinforcing plate protrudes from the side surface, there is a problem in construction such as an obstacle to the formwork of the filler.

Therefore, the present invention can secure a sufficient bending strength even at the position where the bending strength is weakest, and can eliminate the trouble of locating the connection position in the field while securing the connection strength. Sufficient bending strength can be obtained only by bonding synthetic wood members or driving synthetic wood pins, for example, without using metal as a member to perform, and furthermore, there is a protrusion on the lower surface or side surface of the sleeper It is an object of the present invention to provide a connection structure of a synthetic wood sleeper that can be used without any problem without being laid on concrete.

[0011]

In order to achieve the above object, the present invention takes the following technical measures.

That is, the present invention is a connection structure of a composite sleeper which is connected by abutting and adhering two or more longitudinal ends of a composite sleeper. The connecting portions are complementary to each other, and the connecting portions are provided over the predetermined length in the longitudinal direction from the end portions, and the reinforcing plate is provided on at least one of the lower surface and the front and rear side surfaces of the synthetic sleeper. The reinforcing plate is adhered to the surfaces of both the synthetic sleepers, and the lower surface or the side surface of the reinforcing plate is flush with the lower surface or the side surface of the synthetic sleeper. In addition, the connection part of the complementary shape can be made into various forms, such as a so-called finger joint, a pillar shape having substantially the same cross section as the original cross section of the sleeper in a state where both connection parts are joined by uneven fitting or tapered surface butt. What is necessary is just to exhibit. Further, the reinforcing plate may be formed of a rectangular bottom plate or a side plate, or may be formed of an angle-shaped member obtained by integrally molding the bottom plate portion and the side plate portion. Further, it is preferable that the fiber direction of the reinforcing plate is along the longitudinal direction of the sleeper.

According to the connection structure of the present invention, the following effects can be obtained. That is, since the material of the reinforcing plate is made of the same kind of synthetic wood as the synthetic sleeper, a large adhesive strength is obtained by the plastic adhesive without using a metal fixing jig such as a bolt, and the entire connecting area is covered. Practically sufficient bending strength can be obtained. Therefore, even when used for shisa crossing, etc., since metal is not used for the structural members, screw nails and dog nails can be driven into arbitrary positions, which hinders the work of mounting the tie plate for supporting the rail. Not even.

Further, since the bonding surface between the connecting portions of the synthetic sleeper has a predetermined width in the longitudinal direction, the cutting positions of the long fibers embedded in the synthetic sleeper are dispersed in the longitudinal direction, and the longitudinal Most of the long fibers in the longitudinal section at an arbitrary position in the direction can be provided with a tensile stress supporting action, and a large bending strength can be obtained. Since the number of long fibers capable of supporting the tensile stress in the vicinity of the distal end of the connection portion is minimized, the bending strength of the portion is relatively small, but a reinforcing plate is disposed on the lower surface side or both side surfaces of the portion. Thereby, it becomes possible to support the tensile stress even by the long fibers of the reinforcing plate, and as described above, the bonding strength of the bonding surface between the reinforcing plate and the synthetic wood, which has an effect of transmitting this tensile force to the sleeper, as described above. By making it sufficiently large, it is possible to obtain practical strength while being easy to construct with a simple structure.

In addition, the lower surface or side surface of the reinforcing plate is also flush with the lower surface or side surface of the composite sleeper at the joint, and no convex portion is formed on the lower surface or side surface of the sleeper. I can do it.

As the synthetic sleepers, those made of resin pillars reinforced with long fibers can be used. In addition, the connection part shape of the pair of synthetic sleepers is, for example, processing one synthetic sleeper end into a tapered surface having a substantially vertical tip end face, and forming the other synthetic sleeper end into a taper of one synthetic sleeper. It can be processed into a tapered surface with a substantially vertical tip end surface that is complementary to the surface, and these synthetic sleepers can be abutted at the tip end surface, and these end surfaces can be bonded together with an adhesive. It may be shaped.

In the composite sleeper connecting structure according to the present invention, more preferably, all the surfaces of the joints formed by connecting the connecting portions of the synthetic sleepers to be connected to each other and bonding the reinforcing plate to the surfaces of the synthetic sleepers. It is good to be flush. According to this, two or more synthetic sleepers are connected to form one long sleeper, and the surface of the sleeper is
Since the upper surface, the front and rear side surfaces, and the lower surface or the side surfaces are all flush, there is no configuration that hinders mounting such as a tie plate, and the convenience is improved.

Further, by driving in a reinforcing pin made of a resin molded product extending between the reinforcing plate and the synthetic sleeper, even before the adhesive bonding the reinforcing plate to the synthetic sleeper is hardened and exhibits sufficient adhesive strength, The reinforcing pins can provide the shear strength of the bonding surface between the reinforcing plate and the synthetic sleeper. Also, since the reinforcing pins are also made of a resin molded product, preferably synthetic wood, the site where the reinforcing pins are driven It is also possible to drive a screw nail or the like into the hole. The resin molded product is preferably made of the same type of synthetic wood (long fiber reinforced resin foam) as a synthetic sleeper or a reinforcing plate,
Nylon, polypropylene, those molded only with synthetic resins such as polyester, and those synthetic resins reinforced with reinforcing fibers such as glass fiber and carbon fiber,
An appropriate one can be used. In order to further improve the strength, the reinforcing plate is bonded to two or more surfaces of both side surfaces and upper and lower side surfaces, and the reinforcing pin is driven over the reinforcing plate bonded to each surface and one or both of the sleepers. Is preferred.

It is also possible to drive a reinforcing pin made of a resin molded product over both the reinforcing plate and the pair of crossties. According to this, not only the bonding surface between the reinforcing plate and the synthetic sleeper, but also the shear strength of the bonding surface between the pair of synthetic sleepers can be improved by the reinforcing pin, and the bending strength is further improved. Becomes possible. Such a reinforcing pin is particularly suitable when the joint surface between the connecting portions of the pair of synthetic sleepers is a tapered surface inclined in the thickness direction along the longitudinal direction, or in a case where both connecting portions are fitted vertically. It can be suitably used.

The above-mentioned connection structure can be constructed by various methods. For example, the reinforcing plate can be bonded to a synthetic sleeper at a construction site, and can be previously bonded and fixed to one of the synthetic sleepers at a factory or the like. You can keep it. A preferred method of joining the composite sleepers is to form the longitudinal ends of the two synthetic sleepers to be connected to each other in a mutually complementary shape, and to provide at least one of the upper surface, the lower surface, or both side surfaces of one of the composite sleepers with synthetic wood. A reinforcement plate made of is bonded in advance, and is projected from an end of one of the composite sleepers so as to be able to face at least one of the upper surface, the lower surface, or both side surfaces of the other synthetic sleeper. Attach the end joining surfaces of the synthetic sleeper, bond the surface where the other synthetic sleeper is in contact with the reinforcing plate, and drive in a reinforcing pin made of a resin molded product from the surface of the reinforcing plate to the synthetic sleeper. It is characterized by the following. According to this, since the reinforcing plate and one synthetic sleeper are bonded in advance at a factory or the like, sufficient adhesive strength has already been obtained at the time of on-site construction, and the bonding strength with the other synthetic sleeper is
Since it can be reinforced by the reinforcing pin, a practical bending strength can be obtained even before the adhesive is cured.

In the above joining method, preferably, one reinforcing plate is bonded in advance to one synthetic sleeper,
On the other synthetic sleeper, another reinforcing plate having a position different from that of the one reinforcing plate is bonded in advance. According to this, even after the construction, one of the reinforcing plates is firmly adhered to the synthetic sleeper, so that a sufficiently large bending strength can be obtained.

In the above connection structure, the plurality of reinforcing pins are arranged so that the intersection between the joint surface between the composite sleepers and the plurality of reinforcing pins is shifted in the longitudinal direction of the composite sleeper and in one of the width direction and the thickness direction. It can be assumed that it is driven so as to shift. According to this, when a large concentrated load acts on the longitudinal position where the bending strength becomes the smallest (that is, near the tip of the connection portion), the bending stress changes depending on the longitudinal position of the sleeper, so that it can withstand fracture. Although the adhesive strength that can be obtained also varies depending on the position in the longitudinal direction, the bending stress generated in the crossties is reduced by shifting the plurality of intersections shifted in the longitudinal direction in the width direction and / or the thickness direction. , And the tensile / compressive strength of the pin is generally higher than the shear strength, so that the bending strength of the connection portion can be effectively improved.

In the above-mentioned present invention, the raw material of the synthetic sleeper and the reinforcing plate can be formed of a resin reinforced with long fibers buried in the longitudinal direction (this is called "synthetic wood"). Preferably, a thermosetting resin foam (FF) in which long glass fibers are aligned in the longitudinal direction and embedded.
U). Further, the synthetic sleeper may be formed from the above-mentioned synthetic wood alone, but the synthetic sleeper can also be formed from a composite material in which a plate made of synthetic wood, a resin foam or the like is vertically stacked. The density of the synthetic sleepers is generally 0.6 to 1.0 g / cm ³ ,
The content of the long fiber as a reinforcing material can be about 40 to 60% by weight. Either inorganic or organic long fibers may be used, but glass fibers are preferably used. As the thermosetting resin foam, a hard polyurethane resin or a hard polyester resin can be suitably used.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a connection structure of a composite sleeper according to an embodiment of the present invention. In the figure, 1a, 1
b shows a pair of synthetic sleepers. This synthetic sleeper 1a,
As 1b, a columnar body made of a long glass fiber reinforced resin composite material can be suitably used. In addition, synthetic sleeper 1
a, 1b reinforced long fiber direction is longitudinal direction (sleeper longitudinal direction)
Are aligned. The longitudinal ends of the composite sleepers 1a and 1b joined to each other are formed as connecting portions 2a and 2b having complementary shapes, respectively. In the present embodiment, the joint surface between the connecting portions 2a and 2b of both the synthetic sleepers 1a and 1b is
The connection portions 2a and 2b are processed substantially perpendicularly while being processed into a tapered surface in a male-female relationship. Thus, the joining surface has a predetermined width in the longitudinal direction of the sleepers 1a, 1b.

More specifically, the connecting portion 2a of one of the composite sleepers 1a is formed with a tapered surface whose lower surface is gradually inclined upward toward the front end. The upward inclination angle of the tapered surface is 9 ° in the illustrated example, but may be a desired angle. The width in the thickness direction of the tapered surface is preferably about one third of the width in the thickness direction of the sleeper 1a. The connecting portion 2b of the other synthetic sleeper 1b is formed as a tapered surface whose upper surface is gradually inclined downward toward the tip end, and this tapered surface is formed at an angle that matches the tapered surface of the one synthetic sleeper 1a. Have been. In addition, the tension transmission between the long fibers whose cut ends face each other with the tapered surface as a boundary, the tension of one fiber is transmitted as a matrix to the other fibers that are topologically bridged between the cut ends, A path mainly transmitted from the other fiber to the other fiber is mainly used, and the efficiency of the tension transmission increases as the other fiber wraps deeper between the fiber ends. Therefore, the smaller the taper angle is, the more advantageous in transmitting the tension.

Then, an adhesive is applied to the joint surfaces (that is, the tapered surface and the substantially vertical surface) of the two connection portions 2a and 2b of the pair of synthetic sleepers 1a and 1b, and these joint surfaces are abutted and adhered. Upper and lower reinforcing plates 3a, 3
b is bonded over both the sleepers 1a and 1b, and the cross-sectional shape of the joint including the upper and lower reinforcing plates 3a and 3b is the same as the cross-sectional shape of the other portions of the synthetic sleepers 1a and 1b. The adhesive is not particularly limited as long as it can bond the bonding surface between the synthetic sleepers 1a and 1b. Examples of the adhesive include a long fiber and a thermosetting resin foam constituting the synthetic sleeper. It can be appropriately selected according to the material. For example, when the synthetic sleeper is composed of long glass fibers and a hard urethane resin foam, an epoxy resin can be suitably used as the adhesive.

An upper reinforcing plate 3a, a lower reinforcing plate 3b, and a front reinforcing plate 3 are provided around the joint between the pair of composite sleepers 1a and 1b.
c, 3 d of rear-surface reinforcing plates are provided on the front, rear, upper and lower side surfaces, respectively. Each reinforcing plate 3a, 3b, 3c, 3d is bonded to both sleepers 1a, 1b across the joint between the connecting portions 2a, 2b of the pair of synthetic sleepers 1a, 1b. As these reinforcing plates, FFU or rectangular plate-shaped members made of FRP can be used, and it is preferable to use FFU in which the long fiber direction as the reinforcing material is aligned in the longitudinal direction.

The upper and lower reinforcing plate 3a has a front and rear width of the sleeper 1.
a, 1b, which is the same as the front and rear width, and is a pair of synthetic sleepers 1a, 1b.
1b are fitted into recesses 4a provided on both upper surfaces, so that the upper surface of the reinforcing plate 3a is flush with the upper surfaces of the sleepers 1a and 1b, and the front and rear end surfaces of the reinforcing plate 3a are
The front and rear side surfaces of a and 1b are flush with each other. The lower surface of the reinforcing plate 3a is adhered to the entire surface of the bottom surface of the concave portion 4a.
It is adhered over the upper surfaces of a and 1b.

The lower reinforcing plate 3b has a front-rear width of the sleeper 1.
a, 1b, which is the same as the front and rear width, and is a pair of synthetic sleepers 1a, 1b.
1b, the lower surface of the reinforcing plate 3b is flush with the lower surfaces of the sleepers 1a, 1b, and the front and rear end surfaces of the reinforcing plate 3b are
The front and rear side surfaces of a and 1b are flush with each other. Further, the lower surface of the reinforcing plate 3b is adhered to the entire bottom surface of the recess 4b.
a and 1b are adhered over the lower surfaces.

The upper and lower widths of the front reinforcing plate 3c and the rear reinforcing plate 3d are the same as the upper and lower widths of the sleepers 1a and 1b, and the longitudinal width thereof is the longitudinal width of the connecting portions 2a and 2b (shown in the drawing). In this case, the length is larger than the length of the tapered surface. The connecting portions 2a and 2b are provided with reinforcing plates 3c and 3
d is located at the center of the inside of both ends in the longitudinal direction. The longitudinal ends of the reinforcing plates 3c and 3d are connected to the upper and lower reinforcing plates 3c and 3d.
a, 3b at the same position as the outer ends of the front and rear reinforcing plates 3c,
3d is a pair of synthetic sleepers 1a, 1b exposed on the front and rear side surfaces.
They are bonded to the front and rear side surfaces of both composite sleepers 1a, 1b, respectively, so as to cover all the joints between them and the joints between the upper and lower reinforcing plates 3a, 3b and the respective composite sleepers 1a, 1b. The upper end surfaces of the front and rear reinforcing plates 3c and 3d are both sleepers 1a and 1b.
And the front and rear reinforcing plates 3
The lower end surfaces of c and 3d are flush with the lower surfaces of both sleepers 1a and 1b.

In this embodiment, the connection portions 2a, 2b
At a position outside the longitudinal direction than the upper surface reinforcing plate 3a or the lower surface reinforcing plate 3b and one of the both sleepers 1a, 1b, a resin reinforcing pin 5a is driven in the thickness direction (vertical direction). A resin reinforcing pin 5b is driven in the thickness direction over both the upper reinforcing plate 3a or the lower reinforcing plate 3b and both the connecting portions 2a, 2b of the pair of sleepers 1a, 1b.

The reinforcing pins 5b are driven into a plurality of locations (two locations in the illustrated example) in the longitudinal direction, and the sleepers 1a,
1 and the intersection of the reinforcing pin 5b on the left side in FIG. 1 and the intersection of the joining surface and the reinforcing pin 5b on the right side in FIG. Because of the inclination, these intersections are also displaced in the thickness direction.

The front and rear reinforcing plates 3c and 3d and each sleeper 1
Reinforcing pins 5c extending between a and 1b are driven in the width direction (front-back direction). The driving position of the reinforcing pin 5c is shifted in the longitudinal direction from the driving position of the reinforcing pins 5a and 5b.

When the reinforcing pins 5a, 5b, and 5c are driven, an adhesive is applied to the reinforcing pins so that the bending strength of the joint between the synthetic sleepers can be further improved by effectively utilizing the axial strength. Can be improved.

It is to be noted that a bolt and nut made of nylon or FRP may be used in place of the reinforcing pin.

The connection structure can be constructed by an appropriate construction procedure, but preferably, the following joining method can be used. That is, each reinforcing plate 3a, 3b, 3
c and 3d are bonded to one of the composite sleepers in advance at a factory or the like, and the reinforcing plate protrudes from the end of one of the composite sleepers so that the reinforcing plate can face the lower surface of the other synthetic sleeper during construction on site. Let it be. Further, the reinforcing pins 5a, 5b,
A driving hole is formed in advance at a position where 5c is driven.
Then, at the time of on-site construction, an adhesive is applied to the joining surfaces of the ends of the synthetic sleepers 1a and 1b to be joined, and the joining surfaces are joined by butting. At this time, the above-mentioned butting can be performed by bringing the other synthetic sleeper 1b close to the other synthetic sleeper 1b while sliding the same in the horizontal direction, and appropriately cutting the end of the connection portion 2b of the other synthetic sleeper 1b. By keeping the distal end from abutting against the proximal end of the connecting portion 2a of the one sleeper 1a, the tapered surfaces can be reliably contacted with each other,
Strong connection can be achieved by the wedge effect of the tapered surface. Further, an adhesive is applied to a contact surface between each of the reinforcing plates 3a, 3b, 3c, and 3d previously fixed to one of the sleepers and the other sleeper, and these contact surfaces are bonded to each other. . Thereafter, the construction is completed by sequentially driving the reinforcing pins. In this way, the construction can be easily performed without requiring special jigs and tools at the construction site. In this case, the reinforcing pin 5a that penetrates one of the upper and lower reinforcing plates 3a and 3b and one of the crossties can be previously driven in a factory or the like. In addition, the reinforcing plate 3 is connected to the sleeper 1 so that the adhesive strength after construction is surely developed.
It is also possible to hold down the adhesive on the sides a and 1b by using a fastening tool such as a gilt until the adhesive is hardened.

According to the above-mentioned connection method, the bonding area at the site can be reduced, so that the number of man-hours can be reduced, the sleepers can be laid and rectified quickly, and each reinforcing plate can be provided with any one of the reinforcing plates. At the time of construction, it is already firmly adhered to the sleeper, and the part adhered at the site can be given strength by the shear strength and tensile strength of the reinforcing pin, making it practical immediately after construction Since the strength is obtained, it is possible to carry out the work suitably at night.

The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, the front and rear reinforcing plates 3
The c and 3d need not be provided, and the reinforcing pins to be driven in the width direction need not be provided as shown in FIG.

Further, as in the embodiment shown in FIG. 5, only the lower surface reinforcing plate 3b may be provided without providing the upper surface reinforcing plate. In this case, in order to reinforce the connection between the distal end portion of the connecting portion 2a of the sleeper 1a and the base end portion of the connecting portion 2b of the sleeper 1b, a reinforcing pin 5d extending over the two connecting portions 2a and 2b is driven in the vertical direction. Is preferred.

As shown in the embodiment shown in FIG. 6, the front surface of the connecting portion 2a of one of the composite sleepers 1a is formed as a tapered surface that is gradually inclined backward toward the front end, and the other of the composite sleepers 1b is formed. The rear surface of the connecting portion 2b is formed as a tapered surface that is gradually inclined forward along the front end side,
By forming this tapered surface at an angle suitable for the tapered surface of one connecting portion 2a, the connecting portions 2a and 2b can also be configured to be connected in front and back.
In this case, the front and rear reinforcing plates 3c, 3d are connected to both sleepers 1a, 1b.
Recesses 4 respectively formed on the front and rear side surfaces so as to extend
a, 4d, the outer surfaces of the reinforcing plates 3c, 3d
It can be configured to be flush with the front and rear side surfaces of the sleepers 1a, 1b.

Further, as shown in FIG. 7, in addition to the upper and lower reinforcing plates, the front and rear reinforcing plates may all be flush with the sleeper surface. FIG. 8 shows an example of the structure of the left and right sleepers in this case.
Shown in

The sleeper, the reinforcing plate and the reinforcing pin are
Preferably, it is made of a glass fiber reinforced plastic foam (synthetic wood). Examples of the type of foamed resin in this foam include urethane,
Hard thermosetting resins such as epoxy resins, vinyl ester resins, unsaturated polyester resins, and phenol resins are preferably used. In order to improve the compressive strength and reduce the cost in the foamed resin, inorganic fillers such as calcium carbonate, gypsum, talc, aluminum hydroxide, and clay, and lightweight bones such as shirasu balloons, pearlite, and glass balloons are used. A material may be added.

The fiber for reinforcing the foam may be any of inorganic fibers such as glass fiber, carbon fiber and metal fiber, and organic fibers such as natural fiber and synthetic fiber. Glass fiber is suitable in terms of properties. Examples of the glass fiber include a glass roving, a glass roving cloth, a glass mat, and a continuous strand mat. This fiber may be used alone, or two or more layers may be laminated,
Also, long fibers and short fibers may be mixed and used. In addition,
Glass long fibers were aligned in the longitudinal direction to form reinforcing fibers,
Glass long fiber reinforced hard urethane foam (for example, manufactured by Sekisui Chemical Co., Ltd., trade name "Eslon Neo Lumber FF"
U ”) is most preferable in terms of weight reduction, durability and workability.

[0045]

According to the present invention, a long branch sleeper can be constituted only by a member such as synthetic wood which is easy to cut and pierce without using a metal fixing member such as a bolt. For example, it is possible to drive a screw nail or the like for fixing the tie plate at an arbitrary position in the longitudinal direction of the sleeper, and it is not necessary to perform a complicated operation such as adjusting the position of the connection portion according to the site, In addition, it is possible to improve the minimum bending strength to at least a level that can be practically used. In particular, by using the same type of material as the synthetic sleeper as the reinforcing plate, it is possible to obtain excellent bonding strength between these members, and further, it is possible to secure the shear strength of the bonding surface immediately after construction by the reinforcing pin,
The present invention can be suitably applied to the sleeper rectification within a limited time at night. Also, at the joint between the pair of composite sleepers, the surface, especially the lower surface or side surface, is flush with the lower surface or side surface of the composite sleeper, so that it can be used without problems for laying on concrete, and for slab tracks and the like. Can be used without any problems.

[Brief description of the drawings]

FIG. 1 shows a connection structure of a synthetic sleeper according to a first embodiment of the present invention, wherein (a) is a plan view, (b) is a front view, and (c) is a bottom view.

FIG. 2 is an enlarged view of a main part of the connection structure, in which (a) is a plan view, (b) is a front view, and (c) is a bottom view.

FIG. 3 is an enlarged longitudinal sectional view of a main part of the connection structure.

FIG. 4 is an enlarged longitudinal sectional view of a main part of a connection structure of a synthetic sleeper according to a second embodiment of the present invention.

FIG. 5 is an enlarged longitudinal sectional view of a main part of a connection structure for a composite sleeper according to a third embodiment of the present invention.

FIG. 6 shows a connection structure of a synthetic sleeper according to a fourth embodiment of the present invention, wherein (a) is a plan view and (b) is a front view.

7A and 7B show a connection structure for a composite sleeper according to a fifth embodiment of the present invention, wherein FIG. 7A is a plan view, FIG. 7B is a front view, and FIG.

8 (a) and 8 (c) are plan views, and FIGS. 8 (b) and 8 (d) are front views, respectively.

[Explanation of symbols]

 1a, 1b Synthetic sleepers 2a, 2b Complementary connection parts 3b, 3c, 3d Reinforcement plates 5a, 5b, 5c Reinforcement pins

Claims (3)

[Claims] 1. A connection structure for a composite sleeper connected by abutting and bonding longitudinal ends of two or more composite sleepers, wherein the connected ends of the composite sleepers have complementary shapes. A connecting portion, wherein the connecting portion is provided over a predetermined length in the longitudinal direction from the end portion, and a reinforcing plate is provided on at least one of the lower surface and the front and rear side surfaces of the synthetic sleeper; A connection structure for a composite sleeper, wherein the plate is adhered to both surfaces of the composite sleeper and the lower surface or side surface of the reinforcing plate is flush with the lower surface or side surface of the composite sleeper. 2. The joint sleeper according to claim 1, wherein the joints formed by connecting the joints connected to each other and bonding the reinforcing plate are flush with the surface of the synthetic sleeper. Connection structure of the described synthetic sleeper. 3. The connection structure according to claim 1, wherein a reinforcing pin made of a resin molded product is driven into the reinforcing plate and the synthetic sleeper.