JP2933426B2 - Connection structure for synthetic sleepers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a composite sleeper used at a branch portion of a track.

[0002]

2. Description of the Related Art In a railway, a branching portion is provided to branch a vehicle on a track to another track or to cross another track.

[0003] In the sleeper used for the branch portion, the types of the branch portion (single-opening branch, double-opening branch, distribution branch, crossover branch, double branch, three-branch branch, three-wire branch, diamond) Crossing, scissor crossing, etc.), a length of 6 to 9 m is required.

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, the workability is inevitably reduced. Update work becomes extremely difficult.

[0005] For this reason, a joint sleeper is used, and a sleeper piece is inserted under the rail from both sides of the branch portion, and the inserted sleeper piece is joined. Conventionally, in joining the sleeper pieces, as shown in FIG. 7, the ends of the sleeper pieces 1 ′, 1 ′ are so-called half-cut processing into steps 11 ′, 12 ′ related to male and female.
A structure is used in which these steps are overlapped and the overlapped portion is fastened with bolts and nuts 2 ',... (Normally the number of bolts is four).

[0006] With regard to the dynamic state of the track, it can be approximately assumed that the vehicle load is distributed as an evenly distributed load on the track bed via the sleeper, and therefore, the bending moment acting on the center of the sleeper is the sleeper. Becomes larger as the length becomes longer, and the bending moment acting on the center connecting portion of the crossties of the track branching portions becomes larger because the overall length of the crossties is longer. Therefore, it is necessary to provide a large bending strength to the center connecting portion of the crossties of the branch portions.

[0007]

Recently, the use of a thermosetting resin foam sleeper reinforced with long fibers (referred to as a synthetic sleeper) instead of a beech sleeper has been studied.

[0008] However, even if the composite sleeper is connected by applying the above-mentioned conventional beechwood long sleeper joint structure, the bending strength of the connection portion can be only about 30% of the original bending strength of the sleeper. .

[0009] Since only about 30% of the original bending strength of the synthetic sleeper can be imparted to the connecting portion of the synthetic sleeper, it is not possible to use the synthetic sleeper instead of the conventional beechwood sleeper as the sleeper at the branch portion. It is a danger.

[0010] An object of the present invention is to make it possible to connect a synthetic sleeper with a bending strength of 90% or more of the original bending strength of the sleeper, and to replace the conventional beechwood sleeper with a synthetic sleeper as the sleeper at the track branching section. Is to make it possible to

[0011]

A connecting structure for a synthetic sleeper according to the present invention is characterized in that a resin sleeper reinforced with long fibers is bonded with an adhesive on a surface having a substantially vertical surface and a tapered surface. The end of the resin columnar body reinforced with long fibers is processed into a tapered face having a substantially vertical tip end face, butts at the tip end face, and the tapes of these sleeper members are tapered. A joint made of a resin reinforced with long fibers and having a taper surface conforming to the taper surface is loaded between the parting surfaces, and at least between the tip end faces of the sleeper member and the parting material of the sleeper member. A structure in which the gap between the paper surface and the tapered surface of the joint is adhered with an adhesive;

[0012]

The taper bonding surface can support the bending and pulling region of the joint, and the taper angle of the bonding surface is reduced to effectively exert the effect of reinforcing long fibers at the joint. The bending strength of the connection can be made to be comparable (90% or more) to the original bending strength of the synthetic sleeper. Therefore, even if a synthetic sleeper is used as the sleeper at the track branching portion, a sufficient bending strength can be imparted to the connection portion at the center of the sleeper, and the sleeper at the branching portion can be replaced with a synthetic sleeper from a conventional beechwood sleeper.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention.

In FIG. 1, reference numerals 1, 1 denote synthetic sleepers, which have vertical tip end faces 12, 12, and tapered surfaces 111, 112 in a male-female relationship are formed on the lower end surfaces. . The height of the taper surface is set to approximately 1/3 of the thickness of the sleeper. Reference numeral 3 denotes an adhesive, which bonds between the end surfaces 12 and 12 and between the taper surfaces 111 and 112.

FIG. 2A is a perspective view showing another embodiment of the present invention. In FIG. 2A, reference numerals 1 and 1 denote a composite sleeper member. The height of the taper surface is set to approximately 1/3 of the thickness of the sleeper. 2 is a joint,
Molded from the same long fiber reinforced resin as the synthetic sleeper member 1,
The sleeper member 1 has a tapered surface 21 that matches the tapered surface 11. The tapered surface 21 of this joint 2 and the sleeper member 1
The taper surface 11 and the end surfaces 12, 12 of the sleeper members 1, 1 are bonded with an adhesive 3.

The above-mentioned synthetic sleeper member 1 is formed from a thermosetting resin foam reinforced with long fibers buried in the longitudinal direction, and has a density of usually 0.6 to 1.0 g / cm ³ . ,
The content of the reinforcing long fiber is usually 40 to 60% by weight. As the long fiber, any of an inorganic material and an organic material can be used, but glass fiber is preferably used. The thermosetting resin foam is not particularly limited as long as the thermosetting resin foam can be molded into a hard resin foam, but in particular, a hard urethane resin or a hard polyester resin to which foamability is imparted. Is preferred.

It is preferable to use an epoxy resin for the adhesive 3. The composite sleeper connected according to the invention is used as a sleeper in a branch. The connection work is performed at the branch site. For example, in the case of the embodiment shown in FIG. 2A, a synthetic sleeper member is inserted from each side of the track immediately below the turnout, and an adhesive is applied to the tip end surface and the taper surface of each synthetic sleeper member. Then, the sleeper members are butted at the tip end face, a joint is loaded between the taper surfaces of these sleeper members, the joint is supported by a holder, and the adhesive is cured in this state. After the adhesive is hardened, the holder is removed, and the operation is completed.

In the holder, for example, FIG.
As shown in (b) [cross-sectional view of FIG. 5 (a)], push plates 4, 4, 4, 4 are brought into contact with the upper and lower surfaces of the joint, and the gap between these push plates 4, 4 is established. Those fastened with bolts 5 can be used.

In the above-mentioned synthetic sleeper, the Young's modulus against tension is smaller than the Young's modulus against compression, and the tensile region of bending is narrower (approximately 2: 1) than the compressing region of bending. In the connection structure of the sleeper, the tensile stress in the tensile region can be supported by the tape-bonding surface by making the height of the taper surface 11 equal to the thickness of the bending tensile region.

[0020] In FIG. 6, the Te - Pa - a tensile force between the long fibers F ₂ of the long fiber F ₁ of the sleeper member 1 to the boundary of adhesion surface T and the joint 2 transduction, the one long tensile force of the fiber F ₁ is, these are transferred to the resin in addition to the fiber F ₃ bridging topologically as a matrix between the long fibers F _1, F _2, the other from the fiber F ₃ a resin as a matrix other path to be transmitted to the fiber F ₂ is mainly, transmission efficiency of the pulling force increases as the deep overlapping margin between the fiber F ₁ one of the other fibers F _3. This overlap is taper
The smaller the angle θ, the larger the angle, and therefore, the taper angle θ
The smaller the value is, the more the tension supporting action of the long fiber can be promoted through the taper joining surface, and the effect of reinforcing the long fiber can be effectively exerted even at the joint.

Therefore, from the viewpoint of the efficiency of the tension transmission, it is advantageous to make the taper angle θ small, but if it is made too small, the rail is located above the bonding surface and the rail is positioned on the bonding surface. -The maximum bending moment immediately below the tool acts and is disadvantageous.
The par angle θ is set in consideration of these factors. Te - Pa - angle θ is preferably at normal 5 ^{0-20 0.}

In the above case, when the taper angle θ is relatively large, as shown in FIG.
In order to prevent the displacement of the joining surface due to the vertical pressing force, it is preferable to provide locking irregularities 13 on the taper surface.

FIG. 2 (c) shows another embodiment of the present invention, in which the tapered surfaces 11,
11, the synthetic sleeper member 1, 1 having a vertical end surface 12 at the front end, is butted on the vertical end surfaces 12, 12 at the front end,
The upper synthetic joint member 2 and the lower synthetic joint member 2 are loaded between the two synthetic sleeper members, and the tapered surface of the sleeper member 1 is formed between the distal end surfaces 12, 12 of the synthetic sleeper members 1, 1. The taper surface 11 of the joint 2 is adhered to the taper surface 21 of the joint 2 with an adhesive 3, and the height h of each taper surface is set to approximately 1/3 of the height of the sleeper. In this alternative embodiment, it is symmetrical up and down, and there is no need to distinguish between upper and lower sides, which is convenient in handling. The upper joint and the lower joint may be integrated at the intermediate wall 23 as shown in FIG.

FIG. 3 shows another embodiment of the present invention, in which the thickness of the upper joint 2a is increased, and the lower joint is increased in accordance with the increase in the bending tension area accompanying the upward movement of the neutral surface due to the increase. The height h of the tapered surface is increased by increasing the thickness of the joint 2b.

In the present invention, the stress acting on the vertical end faces 12, 12 is mainly a compressive stress, and even if the end faces are slightly inclined, there is almost no effect on the compressive strength. As shown in FIG.

In the composite sleeper connected according to the present invention, the efficiency of transmitting the tension of the long fiber at the joint surface can be sufficiently ensured, and the effect of reinforcing the long fiber can be sufficiently exhibited. Can be brought close enough to the bending strength of This can be confirmed from the comparison of the bending test results between the following examples and comparative examples.

In any of the following examples and comparative examples, the synthetic sleepers and the joints had a long fiber made of glass fiber, a thermosetting resin foam made of a foam-cured urethane resin, and a glass fiber content of 40% by weight, density 0.74
g / cm ² . An epoxy resin adhesive was used as the adhesive.

Example 1 In FIG. 2C, the thickness of the sleeper was 140 mm, the width was 230 mm, the total length was 1400 mm, and the height h of the end of the sleeper member and the tapered surface of the joint were 140/140. 3mm, the width L ₂ of the joint 2 is set to 600mm.

Example 2 In FIG. 3, the sleeper was 140 mm thick and 230 m wide.
m, the total length is 1400 mm, and the maximum thickness of the lower joint 2b is 5
The upper joint 2a used was 10 mm thicker than the lower joint 2b, and the upper end 2a had a thickness of 40 mm.

Comparative Example 1 In FIG. 7, the sleeper was 140 mm thick and 230 m wide.
m, the total length is 1400 mm, the short side length L 'is 550 mm and the long side length L is 850 m among the upper and lower lengths of the sleeper member.
m, the length l of the joining step surface was 300 mm, the number of screw nails was 4, the length of the screw nails was 102 ± 10 mm, and the diameter of the screw portion was 16 mmφ.

Comparative Example 2 The slope of the taper surface of the sleeper member and the joint was the same as in Example 1, and the height of the taper surface was 面 of the height of the sleeper (the state without the end end surface). ). Accordingly, the length of the joint was increased from 600 mm in Example 1 to 900 mm.

With respect to the product of the example and the product of the comparative example, a load was applied at the center point to bend at a speed of 5 mm / min with a simple support having a span of 1120 mm, and the load at the time of breakage was measured. 19t and 22t in the example product 2, which was 95% or more of the breaking load of the non-bonded product (the original breaking load of the synthetic sleeper was 20t). On the other hand, the breaking load of the comparative example product 1 was only 6 t (30% of the original breaking load of the sleeper). The breaking load of the comparative example product 2 was 19 t as in the case of the example 1, but the joint length was the same as that of the example 1.
When it is used at the junction branch, there is a fear that the junction crosses the rail.

[0033]

As described above, according to the present invention, a long sleeper having a bending strength of 90% or more of the original bending strength of the synthetic sleeper can be obtained by joining the synthetic sleeper member, and it is used for a branch portion. In that case, the bending strength of the intermediate joint can be sufficiently guaranteed, and the sleeper members are inserted from both sides of the branch,
By joining these with an adhesive via a joint, the sleeper work at the branch part can be performed easily and with a sufficient safety factor using a synthetic sleeper.

Further, in the case of the synthetic sleeper, the bending tension area is narrower than half the height of the sleeper, and in the connection structure of the present invention, the taper having a small gradient effective for transmitting the tension of the long fiber. -The surface can be present only in its tensile region, the presence of a small gradient taper surface in the compression region can be reduced or eliminated, and the presence of extra taper surface can be reduced. Since it can be eliminated, the length of the joint can be sufficiently reduced. Furthermore, since it is bonded with an adhesive and no metal is used, there is no corrosion and the characteristic of the synthetic sleeper can be retained well.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another different embodiment of the present invention.

FIG. 3 is an explanatory view showing another embodiment of the present invention.

FIG. 4 is an explanatory view showing another embodiment of the present invention.

5 (A) is a side view showing a holder used for connection of the synthetic sleeper of the present invention, and FIG. 5 (B) is a cross-sectional view taken along the line B-B of FIG. 5 (A). .

FIG. 6 is an explanatory view showing a tension transmitting mechanism of long fibers at a joint surface in the connection structure of the synthetic sleeper of the present invention.

FIG. 7 is an explanatory view showing a conventional sleeper joining structure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sleeper member 11 taper surface of sleeper member 111 taper surface of sleeper member 112 taper surface of sleeper member 12 vertical end surface of sleeper member 2 joint 21 taper surface of joint 3 adhesive

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) E01B 7/22 E01B 3/00 E01B 3/10 E01B 3/18 E01B 3/36 E01B 3/44-3 / 46

Claims (2)

(57) [Claims] 1. A connection structure for a composite sleeper, wherein a resin sleeper reinforced with long fibers is bonded with an adhesive on a surface having a substantially vertical surface and a taper surface. 2. A sleeper member formed by processing the end of a resin columnar body reinforced with long fibers into a tapered surface having a substantially vertical tip end face, butts on the tip end face, and ties these sleeper members. -A joint made of a resin reinforced with long fibers and having a taper surface conforming to the taper surface is loaded between the taper surfaces, and at least the taper surface of the sleeper member and the joint are mounted. Taper
A connection structure for a synthetic sleeper, characterized in that the surface and the surface are bonded with an adhesive.