JP2002285502A - Method for connecting composite sleeper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure sufficient bending strength even at the weakest place of bending strength, and to obtain sufficient bending strength and tensile strength immediately after the execution of works, reducing the number of reinforcing pins as much as possible and without using a metal for a member for assuring bond strength, solving the complicatedness of the positioning of the place of connection at a site. SOLUTION: In a method for bonding two or more of composite sleepers 1a and 1b by abutting end sections in the longitudinal direction of the composite sleepers, the end sections to be connected of the composite sleepers 1a and 1b are formed mutually in connecting sections 2a and 2b having a mutually complementary shape, the connecting sections 2a and 2b are formed extending over fixed length in the longitudinal direction from the end sections, a reinforcing plate 3 extending over both sleepers 1a and 1b is installed onto at least one surfaces of the top faces, undersides or both side faces of the composite sleepers 1a and 1b, the reinforcing plate 3 is bonded on the surfaces of both composite sleepers 1a and 1b, and both sleepers 1a and 1b are engaged in the longitudinal direction in the case of the execution of works.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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.

[0003] However, in an overcrowded urban area, viaducts, or places surrounded by soundproof walls, etc., if the above-mentioned long sleepers of 6 to 9 m are handled as one unit, the workability is inevitably reduced. Replacement work becomes extremely difficult.

For this reason, there has been used a sleeper connection structure in which ends of a sleeper are abutted from above and below, and this portion is sandwiched from above and below by an iron plate having a bolt insertion hole, and the iron plate and the sleeper are inserted and fastened by bolt nuts. ing.

The applicant of the present application manufactures and sells a sleeper using 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 to date so that excellent flexural strength can be obtained even when JIS is used (for example, JP-A-6-248604, JP-A-6-240601, JP-A-5-98601). JP, JP-A-5-51901, JP-A-4-1493
No. 02).

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 seam portion where the strength is most 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.

On the other hand, a connecting portion having a tapered surface is formed at an end portion of the synthetic sleeper, and the connecting portions of the pair of synthetic sleepers are fitted to each other in an uneven manner, and these joining surfaces are adhered to each other and reach both synthetic sleepers. If you drive in a resin reinforcing pin,
Without using metal members, sufficient bending strength can be obtained immediately after construction, but in terms of tensile strength, only the shear strength of the reinforcing pin is effective immediately after construction, and in order to obtain sufficient tensile strength There is an inconvenience that a large number of reinforcing pins must be driven.

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. Without using metal as a member to perform, for example, sufficient bending strength can be obtained only by bonding of a resin reinforcing plate or driving of a resin reinforcing pin, and the number of driving of the reinforcing pin has at least a sufficient tensile strength. An object of the present invention is to provide a connection method and connection structure of a synthetic wooden sleeper which can be obtained.

[0011]

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

That is, the present invention provides a pair of composite sleepers which are connected to each other in the longitudinal direction so that the longitudinal ends thereof are complementary to each other, so that at least one of the composite sleepers can be in contact with the surface of the other composite sleeper. A reinforcing plate made of fiber reinforced resin is bonded in advance, and the ends of the pair of synthetic sleepers are joined at the time of construction on site, and the reinforcing plate previously provided on the other synthetic sleeper is longitudinally attached to the other synthetic sleeper. Is characterized in that it is engaged with. More preferably, when joining the ends of the pair of synthetic sleepers, the end joining surfaces of these synthetic sleepers are bonded together, and the surface of the other synthetic sleeper that is in contact with the reinforcing plate is also bonded. In addition, the reinforcing plate,
It can be provided on at least one of the upper, lower or both sides of the composite sleeper, and the reinforcing plate can be adhered to the surfaces of both composite sleepers. In addition, the complementary connecting portion can be in various forms, and has a columnar shape having a cross section substantially the same as the original cross section in a state where both connecting portions are joined by uneven fitting or tapered surface butt. I just need. The reinforcing plate may be formed of a rectangular bottom plate or a side plate, or may be formed in an angle shape in which the bottom plate and the side plate are integrally formed. Further, the reinforcing plate may be formed on one of the sleeper bodies on both sides and the bottom. The reinforcing plate is preferably made of a long fiber reinforced resin foam (synthetic wood) whose fiber direction is aligned in the longitudinal direction of the sleeper. Further, in the present invention, an adhesive and a reinforcing pin are used for joining each member,
After the application, the above-mentioned reinforcing plate and the reinforcing pin function until the adhesive hardens and exhibits the desired adhesive strength, and exhibits sufficient sleeper strength. Therefore, the reinforcing plate is fastened to the synthetic sleeper using a conventional fastening tool such as a giant clam, and it is not necessary to use a process of removing the fastening tool after the expected adhesive strength is obtained, which is extremely simple. Can be used in any way. In this specification, the "longitudinal direction of the sleeper" is a direction orthogonal to the railway track, the "width direction of the sleeper" is a direction parallel to the railway track, and the "thickness direction of the sleeper" refers to the up-down direction. Shall be.

According to the connection method of the present invention, since the reinforcing plate and one of the composite sleepers are bonded in advance at a factory or the like, sufficient bonding strength is already obtained at the time of on-site construction, and the other composite sleeper is already bonded. Since the reinforcing plate is engaged with the sleeper in the longitudinal direction, both practical bending strength and tensile strength can be obtained even before the adhesive is hardened. In addition, since the material of the reinforcing plate is a fiber reinforced resin such as FRP or synthetic wood, a large adhesive strength between the synthetic sleeper and the reinforcing plate can be obtained with a plastic adhesive without using a metal fixing jig such as a bolt. Thus, practically sufficient bending strength can be obtained over the entire range of the connection portion. 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, by making the bonding surfaces of the connecting portions of the synthetic sleepers have a predetermined width in the longitudinal direction, the cutting positions of the long fibers embedded in the synthetic sleepers are dispersed in the longitudinal direction, Most of the long fibers in the longitudinal section at any position in the longitudinal direction can have a tensile stress bearing action,
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 provided on the upper surface side, the lower surface side, or both side surfaces of the portion. By arranging, it becomes possible to support the tensile stress also by 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, is 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 bonding between the other synthetic sleeper and the reinforcing plate is performed at the site during the maintenance hours at midnight, and the train operation starts several hours later,
Even before the adhesion between the other synthetic sleeper and the reinforcing plate is completely dried and hardened, sufficient bending strength and tensile strength are exhibited immediately after construction by the engagement structure in the longitudinal direction of these two members.

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 connection method of the present invention, after joining the ends of the pair of synthetic sleepers, a reinforcing pin made of a resin molded product extending over the reinforcing plate and the other synthetic sleeper can be driven. According to this, even before the adhesive bonding the reinforcing plate to the synthetic sleeper is hardened and exerts sufficient adhesive strength, the reinforcing pin has the shear strength of the bonding surface between the reinforcing plate and the synthetic sleeper. In addition, since the reinforcing pin is also made of a resin molded product, preferably synthetic wood, it is possible to drive a screw nail or the like into a portion where the reinforcing pin is driven. The resin molded article is preferably made of synthetic wood (long fiber reinforced resin foam) of the same kind as a synthetic sleeper or a reinforcing plate, but an appropriate one such as one molded only with a thermosetting resin is used. be able to. 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 driving hole for driving the reinforcing pin may be drilled on site, but preferably,
A pair of synthetic sleepers is temporarily assembled in a factory or the like in advance, and a driving hole at a portion where a reinforcing pin is to be driven is drilled.

The structure in which the reinforcing plate is longitudinally engaged with the other synthetic sleeper can be of various types. For example,
In a factory or the like, a locking projection is provided on one of the other synthetic sleeper and the reinforcing plate in advance, and the other,
Locking recesses corresponding to the locking protrusions are provided, and the reinforcement plate can be engaged with the other synthetic sleeper in the longitudinal direction by the engagement between the locking protrusions and the locking recesses. According to this, a longitudinal engagement structure can be obtained only by joining a pair of synthetic sleepers, and it is possible to easily and quickly obtain a tensile strength immediately after construction. In addition, it is preferable that these locking projections and locking recesses are provided in the longitudinal direction outside of the joining range of both sleepers (the fitting range of the connecting portions). Can be prevented from decreasing.

Also, after joining the ends of the pair of synthetic sleepers, a locking member is driven into the joint surface between the other synthetic sleeper and the reinforcing plate, thereby engaging the reinforcing plate with the other synthetic sleeper in the longitudinal direction. They can also be combined. The locking member engages both the other synthetic sleeper and the reinforcing plate in the longitudinal direction, and the tensile stress is transmitted through the locking member. In addition, it is preferable that a groove for driving is formed in advance on a joint surface between the other synthetic sleeper and the reinforcing plate at a portion where the locking material is driven. According to this, when joining a pair of composite sleepers from the longitudinal direction, there is no locking material, so it is possible to smoothly join the pair of synthetic sleepers, and then the locking material is removed. It is possible to obtain a longitudinal engagement structure by a simple operation of driving.

Further, according to the present invention, the longitudinal ends of a pair of composite sleepers connected to each other are formed in a complementary shape to each other, and the ends of the pair of composite sleepers are joined at the time of on-site construction, and this joint is formed. A reinforcing plate is adhered to at least one of the upper surface, the lower surface, and both side surfaces of the composite sleeper, and the reinforcing plate is engaged with both synthetic sleepers in the longitudinal direction. According to this, since the reinforcing plate is constructed on site, the reinforcing plate protruding from the end of the sleeper is not damaged at the time of transporting the synthetic sleeper, and a sufficient tensile strength is obtained immediately after the construction. It becomes possible.

In the above connection method, the reinforcing plate can contact at least one of the upper surface, lower surface, or both side surfaces of one of the composite sleepers and at least one surface of the upper surface, lower surface, or both side surfaces of the other synthetic sleeper. It is preferable to previously bond the composite sleeper so that it protrudes from the end. Then, at the time of on-site construction, the end joint surfaces of the two synthetic sleepers are adhered to each other, the surface where the other synthetic sleeper and the reinforcing plate are in contact with each other is adhered, and the resin is further bonded so as to reach the reinforcing plate and each synthetic sleeper. A reinforcing pin made of a molded product can be driven.

Preferably, a reinforcing pin made of a resin molded product is driven over both synthetic sleepers. According to this, even before the adhesive bonding the connection portions of the pair of synthetic sleepers is hardened and exhibits sufficient bonding strength, the reinforcing pin has the shear strength of the bonding surface between the connection portions. In addition, since the reinforcing pin is also made of a resin molded product, preferably synthetic wood, it is possible to drive a screw nail or the like into a portion where the reinforcing pin is driven. In addition, it is preferable to drive the reinforcing pin after applying the adhesive to the surface, and according to this, it is possible to maximize the tensile strength of the reinforcing pin in the axial direction,
It is possible to further improve the bending strength of the connecting portion between the synthetic woods.

Further, by making the bonding surfaces of the connecting portions of the synthetic sleepers have a predetermined width in the longitudinal direction, the cutting positions of the long fibers embedded in the synthetic sleepers are dispersed in the longitudinal direction, Most of the long fibers in the longitudinal section at any position in the longitudinal direction can have a tensile stress bearing action,
A large bending strength can be obtained. In addition, 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 the reinforcing plate over both sleepers is provided on the lower surface side or both side surfaces of the portion. By adhering, it becomes possible to support the tensile stress by the long fibers of the reinforcing plate,
The bond strength of the bonding surface between the reinforcing plate and the synthetic wood, which transmits this tensile force to the sleepers, is large because it is the same type of material. Is possible.

Further, a reinforcing plate is provided on the lower surface side and / or both side surfaces of the composite sleeper, and the reinforcing plate is bonded to both surfaces of the pair of sleepers, and the width of the reinforcing plate in the longitudinal direction is the same as that of the connection of the sleeper. It is preferable that the connecting portion is made larger than the longitudinal width of the portion and that the connecting portion is located inside both ends in the longitudinal direction of the reinforcing plate in plan view. Here, it is assumed that a reinforcing pin made of a resin molded product is driven into the reinforcing plate and each sleeper, or a reinforcing pin made of a resin molded product is driven into both the reinforcing plate and the pair of sleepers. It can also be.

In the present invention described above, the same material as the synthetic sleeper can be used as a raw material for the reinforcing plate. In addition, synthetic wood as a raw material for synthetic sleepers and reinforcing boards can be formed of a resin reinforced with long fibers buried with the fiber direction aligned in the longitudinal direction (this is referred to as "synthetic wood"), and is more preferable. Can be formed from a thermosetting resin foam in which long glass fibers are aligned in the longitudinal direction and embedded. 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 sleeper is generally 0.6 to 1.0 g / cm ³ , and the content of the long fiber as the 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.

[0027]

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

FIGS. 1 and 2 show a connection structure and a joining method of a composite sleeper according to an embodiment of the present invention. In the figure, 1a and 1b show a pair of synthetic sleepers, each of the sleepers 1a and 1b has a length of about 3 m in the longitudinal direction,
By connecting these sleepers 1a and 1b, a long branch sleeper of about 6 m is configured. As the synthetic sleepers 1a and 1b, a columnar body made of a long glass fiber reinforced resin composite material can be suitably used. In addition, the reinforcing long fiber directions of the synthetic sleepers 1a and 1b are aligned in the longitudinal direction (the longitudinal direction of the sleeper). These synthetic sleepers 1a, 1b
Are connected to each other as connecting portions 2a and 2b having complementary shapes. In the present embodiment, the joint surfaces between the connecting portions 2a and 2b of both the synthetic sleepers 1a and 1b are machined into tapered surfaces in a male-female relationship, and the tip surfaces of the connecting portions 2a and 2b are machined substantially vertically. Have been. Thus, the joining surface has a predetermined width in the longitudinal direction of the sleepers 1a, 1b.

More specifically, the connection portion 2a of one of the composite sleepers 1a has an upper surface flush with the main body of the sleeper, and a lower surface thereof is formed as a tapered surface which is gradually inclined upward toward the front end. I have. The upward inclination angle of this tapered surface is
In the illustrated example, the angle is set to 9 °, but it can be set to 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. In addition, the distal end surface of the connection portion 2a is located at the upper end of the sleeper 1a. The connecting portion 2b of the other synthetic sleeper 1b has a lower surface flush with the main body of the sleeper, and an upper surface thereof is formed as a tapered surface which is gradually inclined downward toward the front end side. It is formed at an angle suitable for the tapered surface of the synthetic sleeper 1a. 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 becomes larger as the other fiber is deeply wrapped 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 connecting portions 2a and 2b of the pair of synthetic sleepers 1a and 1b, and the joined surfaces are abutted and adhered. I have. 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.

A reinforcing plate 3 made of synthetic wood is provided on the lower surface side of the synthetic sleeper 1a. The reinforcing plate 3 is a plate material having a rectangular shape in a plan view, in which the direction of long fibers as the reinforcing material is aligned in the longitudinal direction. In addition,
It is also possible to use a reinforcing plate made of FRP.

The reinforcing plate 3 is adhered to the lower surface of the synthetic sleeper 1a with an adhesive. The longitudinal width of the reinforcing plate 3 is
The width in the longitudinal direction of the connection portions 2a and 2b (the length in the longitudinal direction of the tapered surface in the illustrated example) is larger. Furthermore, the connection parts 2a and 2b are located at the center inside the both ends in the longitudinal direction of the reinforcing plate 3 in plan view. Therefore, the reinforcing plate 3 is a pair of synthetic sleepers 1a,
The reinforcement plate 3 is bonded to the two sleepers 1a, 1b while straddling the seam of the pair of synthetic sleepers 1a, 1b exposed on the upper surface side in a plan view. The Rukoto.

In this embodiment, the connection portions 2a, 2b
At a position outside the longitudinal direction, the reinforcing plate 3 and each sleeper 1a,
1b, a reinforcing pin 4 made of glass fiber reinforced resin is driven in the thickness direction, and a reinforcing pin 3 made of glass fiber reinforced resin is formed on both the reinforcing plate 3 and both connecting portions 2a, 2b of the pair of sleepers 1a, 1b. 5 are driven in the thickness direction. When the reinforcing pins 4 and 5 are driven, an adhesive is applied to the reinforcing pins 4 and 5 to effectively use the axial strength of the pins 4 and 5 to bend the connecting portion between the synthetic sleepers. The strength can be further improved.

The reinforcing pins 5 are driven into a plurality of locations (two locations in the illustrated example) in the longitudinal direction, and the sleepers 1a, 1b
1 (b), and the intersection of the joint surface and the right reinforcement pin 5 in FIG. 1 (b) is such that the joint surface extends along the longitudinal direction. Because of the vertical inclination, these intersections are also displaced in the thickness direction.

Further, in the present embodiment, the locking projection 7 is provided on the upper surface of the tip of the reinforcing plate 3, and the locking recess 8 corresponding to the locking projection 7 is formed on the lower surface of the sleeper 1b. The reinforcing plate 3 and the sleeper 1b are engaged in the longitudinal direction by the engagement between the locking projections 7 and the locking recesses 8. The locking projection 7 may be formed by cutting or turning a reinforcing plate, but in the illustrated example, the plate thickness is 5 m.
The locking projection 7 is formed by bonding a resin plate material of about m in advance.

Next, a connection method for constructing the connection structure will be described. As shown in FIG. 2, the reinforcing plate 3 is previously bonded to the lower surface of one of the composite sleepers 1a in a factory or the like, and the reinforcing plate 3 is attached to the other synthetic sleeper 1 at the time of on-site construction.
b so that it can be in contact with the lower surface of one of the synthetic sleepers 1a. At the position where the reinforcing pins 4 and 5 are driven, a hole 6 in the thickness direction is drilled in a state where the pair of synthetic sleepers 1a and 1b are temporarily assembled at a factory or the like.

At the time of construction on site, the synthetic sleepers 1a, 1
An adhesive is applied to the joining surfaces of the ends to be joined in b, 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 portion from abutting against the proximal end portion of the connecting portion 2a of the one sleeper 1a, the tapered surfaces can be reliably contacted with each other, and a strong connection can be achieved by the wedge effect of the tapered surface. Can be performed. Further, an adhesive is also applied to the contact surface between the reinforcing plate 3 and the other sleeper 1b, and these contact surfaces are bonded to each other. In addition, by joining the both sleepers 1a and 1b, the locking projections 7 of the reinforcing plate 3 are fitted so as to bite into the locking recesses 8 of the other sleeper 1b, and a longitudinal engagement structure is obtained. . Thereafter, the reinforcing pins 4 and 5 are sequentially driven into the holes 6 to complete the construction. In this case, if the reinforcing pins 4 that penetrate the reinforcing plate 3 and the one sleeper 1a are previously driven in at a factory or the like to complete the adhesive bonding, the construction is facilitated.

According to this joining method, the bonding area at the site can be reduced, so that the number of man-hours can be reduced, the laying and rectification of the ties can be performed quickly, and the one tie 1a and the reinforcing plate can be connected. 3 is already firmly bonded at the time of construction, and the site joined at the site can be provided with a large tensile strength by the engagement of the locking projection 7 and the locking recess 8. With the tensile strength of the reinforcing pins 4 and 5 in the axial direction and the taper fitting structure of both sleepers, sufficient bending strength can be obtained even at the joint, and practical strength can be obtained immediately after construction. The present invention can be suitably implemented for nighttime work during which operation is suspended, and it is possible to prevent the operation of the train in the early morning from being hindered.

The reinforcing plate 3 may be bonded to the synthetic sleeper 1b in advance, and the synthetic sleeper 1a may be positioned and bonded thereto.

Next, the embodiment shown in FIGS. 3 and 4 will be described. The same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. .

In this embodiment, reinforcing plates 3a and 3b are provided not only on the lower reinforcing plate 3 but also on the front and rear side surfaces of the joint. Each of the reinforcing plates 3a and 3b has the same length as the reinforcing plate 3 on the lower surface side in the longitudinal direction.
The upper end surfaces of a and 3b are flush with the upper surface of the sleeper body, and the lower end surfaces of the reinforcing plates 3a and 3b are flush with the lower surface of the reinforcing plate 3.

As shown in FIG. 4, the reinforcing plate 3a on the rear side is previously bonded to the rear side of the sleeper 1a on the left side in the drawing. The reinforcing plate 3a protrudes from the connecting portion 2a of the sleeper 1a to the distal end side, and a locking projection 7 is provided on the inner surface of the protruding portion. On the other hand, a reinforcing plate 3 is provided on the back side of the sleeper 1b on the right side in the drawing on the rear side closer to the base end than the connecting portion 2b.
A locking concave portion 8 corresponding to the locking convex portion 7 of FIG.

The reinforcing plate 3b on the front side is the sleeper 1 on the right side in the figure.
a is adhesively bonded in advance to the front side surface. This reinforcing plate 3b
Project from the connecting portion 2b of the sleeper 1b toward the distal end side, and a locking convex portion 7 is provided on the inner surface of the projecting portion. On the other hand, a locking recess 8 corresponding to the locking projection 7 of the reinforcing plate 3b is formed in advance on the back side of the sleeper 1a on the left side of the drawing on the rear side closer to the base end than the connection portion 2a.

At the time of on-site construction, both sleepers 1a, 1b
An adhesive is applied to the joint surfaces of the ends to be joined and the joint surfaces between the reinforcing plates 3, 3a, 3b and the sleepers 1a, 1b, and the both sleepers 1a, 1b are approached from the longitudinal direction, These joining surfaces are butted against each other. At this time, both the sleepers 1a, and the thickness of the front and rear locking projections 7 (about 5 mm)
1b is shifted back and forth, and after the joining end faces of the sleepers are abutted with each other, the positions of the both sleepers 1a and 1b in the front-rear direction are adjusted so that each locking projection 7 bites into the locking recess 8 in the front-rear direction. Can fit. Other steps are the first
The detailed description is omitted because it is the same as the embodiment.

FIGS. 5 and 6 show a third embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. explain.

In the present embodiment, both the crossties 1a, 1b are straddled over the joint at the end of the connecting portion exposed on the upper surface side of the crossties 1a, 1b.
1b, an upper surface reinforcing plate 3c bonded to the upper surface,
A lower surface reinforcing plate 3 is provided, which is bonded to the lower surfaces of both sleepers 1a, 1b so as to straddle the joint at the distal end of the connecting portion exposed on the lower surfaces of the a and 1b. The upper surface reinforcing plate 3c includes both sleepers 1a, 1
The upper surface of the reinforcing plate 3c is flush with the upper surface of the sleeper main body portion. The lower surface reinforcing plate 3 is fitted into a concave portion 12 provided on the lower surface of the sleepers 1a and 1b so as to extend over the sleepers 1a and 1b.
The lower surface of the reinforcing plate 3 is flush with the lower surface of the sleeper body.

On the lower surface at both ends in the longitudinal direction of the sleeper of the upper reinforcing plate 3c, locking projections 7 projecting downward are provided. On the other hand, a locking recess 8 corresponding to the locking projection 7 is provided on the bottom surface of the recess 11 of each of the sleepers 1a and 1b, and the reinforcing plate 3c is engaged with the both sleepers 1a and 1b in the longitudinal direction. Are adapted.

As a connection method for obtaining this connection structure, for example, as shown in FIG. 6, a lower surface reinforcing plate 3a is bonded in advance to the left sleeper 1a shown in the figure, and these two sleepers 1a and 1b are connected to the site. Can be joined. After this,
An upper surface reinforcing plate 3 is provided at the butting portion of both sleepers 1a and 1b.
c is bonded and the reinforcing pin is driven in. Conversely, the upper surface reinforcing plate 3c may be adhesively bonded to the sleeper 1b, and the lower surface reinforcing plate 3a may be adhesively bonded to the sleeper 1b. Further, in the case of being attached so as to bite into both sleepers 1a and 1b like the upper surface reinforcing plate 3c, the reinforcing plate 3
It is also possible to bond c to the both sleepers 1a, 1b on site.

FIGS. 7 and 8 show a fourth embodiment of the present invention. The difference from the first embodiment is that instead of the engaging structure using the locking projections and the locking recesses, a connecting surface is provided. In that a longitudinal engagement structure is obtained by driving the locking member 9. That is, the upper surface of the reinforcing plate 3 (the joint surface with the other sleeper 1b) is formed with a groove 14 (recess) for driving a locking material extending inward from the front and rear ends. on the other hand,
On the lower surface (joint surface with the reinforcing plate 3) of the other sleeper 1b, a groove 15 (recess) for engaging material driving is formed at a position corresponding to the groove 14 and extends inward in the front-rear direction from the front-rear end. And these two groove portions 14 and 15 are connected to both sleepers 1a and 1b.
Are matched to form a locking material driving hole.

Therefore, in this embodiment, after the reinforcing plate 3 is bonded to the sleeper 1a, the front and rear driving holes formed in the joint surface between the sleeper 1b and the reinforcing plate 3 are wedge-shaped from the front and rear sides. When the locking member 9 is driven, the sleeper 1b and the reinforcing plate 3 are engaged with each other in the longitudinal direction via the locking member 9.

By driving in the reinforcing pins 4 and 5 also before the operation of driving the locking member 9, it is possible to obtain sufficient bending strength and tensile strength immediately after construction.

FIG. 9 and FIG. 10 show a fifth embodiment of the present invention.
The front and rear reinforcing plates 3a and 3b extending in the longitudinal direction over a range exceeding the joining range of the a and 2b are provided.
A longitudinal engagement structure is obtained by driving a locking member 9 into a joint surface between the 3b and the sleepers 1a, 1b.

More specifically, an inner surface of the rear reinforcing plate 3a (joining surface with the right sleeper 1b in the drawing) is formed with a groove 14 for driving a locking material extending downward from the upper end. On the other hand, on the rear side surface (joint surface with the reinforcing plate 3a) of the sleeper 1b on the right side in the drawing, a groove portion 15 for driving a locking material extending downward from the upper end portion is formed at a position corresponding to the groove portion 14. , These two groove portions 14 and 15 are both sleepers 1a,
1b is matched to form a locking material driving hole.

Similarly, on the inner surface of the reinforcing plate 3b on the front side (the joint surface with the sleeper 1a on the left side in the figure), there is formed a groove 14 for driving a locking material extending downward from the upper end. On the other hand, also on the front side surface (joining surface with the reinforcing plate 3b) of the sleeper 1a on the left side in the figure, a groove 15 for driving a locking material extending downward from the upper end is formed at a position corresponding to the groove 14. The two groove portions 14 and 15 coincide with each other when the both sleepers 1a and 1b are abutted with each other to form a locking material driving hole.

Therefore, in this embodiment, both sleepers 1
a, 1b and the reinforcing plates 3a, 3b are adhesively bonded to each other, and then a locking member 9 is formed from above in a driving hole formed in a joint surface between each of the sleepers 1a, 1b and the reinforcing plate 3a, 3b to be connected thereto. , The two sleepers 1
a and 1b are engaged in the longitudinal direction. Therefore, a sufficient tensile strength can be obtained immediately after the construction, and a sufficient bending strength can be obtained by the combination of the taper fitting structure and the functions of the reinforcing pins 4 and 5. In FIGS. 9 and 10, the side reinforcing plates are joined to both the sleepers 1a and 1b, respectively, but both side reinforcing plates may be attached to one of them, for example, the sleeper 1a.

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. Further, as the reinforcing pin, a synthetic resin molded product such as nylon, polypropylene, or polyester can be used.

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 order to secure weight reduction, durability and workability.

[0058]

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 withstand practical use, and it is difficult to cause shear fracture even when a large bending stress is applied, and due to the longitudinal engagement structure, it has sufficient tensile strength immediately after construction and Flexural strength can be obtained. In particular, by using the same type of material as the synthetic sleeper as the reinforcing plate or the reinforcing pin, it is possible to obtain an excellent adhesive strength between these members, and to carry out the present invention suitably for the correction of the sleeper within a limited time at night. Is possible.

[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 and (b) is a front view.

FIG. 2 is an exploded perspective view of the connection structure.

3A and 3B show a connection structure for a composite sleeper according to a second embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a front view.

FIG. 4 is an exploded perspective view of the connection structure.

5A and 5B show a connection structure for a composite sleeper according to a third embodiment of the present invention, wherein FIG. 5A is a plan view and FIG. 5B is a front view.

FIG. 6 is an exploded perspective view of the connection structure.

FIG. 7 shows a connection structure of a synthetic sleeper according to a fourth embodiment of the present invention, wherein (a) is a plan view, (b) is a front view, and (c) is an enlarged cross-sectional view taken along line AA of (b). It is.

FIG. 8 is an exploded perspective view of the connection structure.

FIG. 9 shows a connection structure for a composite sleeper according to a fifth embodiment of the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 10 is an exploded perspective view of the connection structure.

[Explanation of symbols]

1a, 1b Composite sleepers 2a, 2b Complementary connection parts 3, 3a, 3b, 3c Reinforcement plate 4 Reinforcement pins driven over reinforcement plate and composite sleeper 5 Reinforcement pins driven over a pair of composite sleepers connected to each other 7 locking projection 8 locking recess 9 locking material

Claims (6)

[Claims] 1. The longitudinal ends of a pair of synthetic sleepers connected to each other are each formed in a complementary shape to each other, and at least one synthetic sleeper is made of a fiber-reinforced resin so as to be able to face the surface of the other synthetic sleeper. The reinforcement plate is bonded in advance and the ends of the pair of composite sleepers are joined at the time of on-site construction, and the reinforcement plate previously provided on the other composite sleeper is longitudinally engaged with the other composite sleeper. A method of connecting a synthetic sleeper, characterized in that: 2. When joining the ends of a pair of synthetic sleepers, the end joining surfaces of these synthetic sleepers are bonded together, and the surface of the other synthetic sleeper that is in contact with the reinforcing plate is also bonded. The method of connecting a synthetic sleeper according to claim 1, wherein: 3. After joining the ends of a pair of synthetic sleepers,
The method of connecting a synthetic sleeper according to claim 1 or 2, wherein a reinforcing pin made of a resin molded product is inserted between the reinforcing plate and the other synthetic sleeper. 4. A locking projection is provided on one of the other synthetic sleeper and the reinforcing plate in advance, and
A locking concave portion corresponding to the locking convex portion is provided, and the reinforcing plate is longitudinally engaged with the other synthetic sleeper by engagement of the locking convex portion and the locking concave portion. The method of connecting a synthetic sleeper according to claim 1, 2 or 3. 5. After joining the ends of a pair of synthetic sleepers,
The composite according to claim 1, wherein the reinforcing plate is longitudinally engaged with the other composite sleeper by driving a locking material into a joint surface between the other composite sleeper and the reinforcing plate. How to connect sleepers. 6. A pair of composite sleepers which are connected to each other in a longitudinal direction are formed to have mutually complementary shapes, and the ends of the pair of composite sleepers are joined at the time of on-site construction. A method of connecting a composite sleeper, wherein a reinforcing plate is bonded to at least one of the two side surfaces, and the reinforcing plate is longitudinally engaged with both of the composite sleepers.