JP4848567B2 - Synthetic sleepers - Google Patents

Synthetic sleepers Download PDF

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JP4848567B2
JP4848567B2 JP2007124089A JP2007124089A JP4848567B2 JP 4848567 B2 JP4848567 B2 JP 4848567B2 JP 2007124089 A JP2007124089 A JP 2007124089A JP 2007124089 A JP2007124089 A JP 2007124089A JP 4848567 B2 JP4848567 B2 JP 4848567B2
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fiber bundle
embedded
synthetic sleeper
reinforcing fiber
plug
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JP2008280689A (en
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岸 健 峰
木 克 明 鈴
野 健 次 岡
井 明 則 永
平 豊 治 兼
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NHK Spring Co Ltd
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NHK Spring Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite sleeper which enhances its bearing capacity, that is, withdrawal resistance by increasing strength after the hardening of an adhesive for fixing an embedded plug of the composite sleeper. <P>SOLUTION: In this composite sleeper in which a bundle of continuous glass fibers is longitudinally arranged and hardened by a resin, the embedded plug, in which a flange is mounted on the bottom of a through female screw by means of an anti-coming-off bolt, is inserted into a non-through prepared hole which is drilled into the composite sleeper; and a bundle of reinforcing fibers is embedded along a vertical direction in the periphery of the embedded plug, and fixed by means of an epoxy resin-based adhesive, an unsaturated polyester resin-based adhesive, or a vinylester adhesive. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、鉄道レール用の合成枕木に係り、より詳細には、レールを固定する固定ボルトの引き抜き抵抗力を充分に大きくすることができる合成枕木に関する。   The present invention relates to a synthetic sleeper for railroad rails, and more particularly to a synthetic sleeper that can sufficiently increase the pull-out resistance of a fixing bolt that fixes a rail.

鉄道レール用の枕木は、木材やコンクリートのものが広く使用されている。しかし、木材は雨などに対する耐久性に劣り、コンクリートは耐久性に優れるが、重くて防振性や防音性に劣る。そこで、木材やコンクリートに替わる枕木として、硬質ウレタン樹脂を母材樹脂として使用し、ガラス長繊維またはガラス長繊維束を埋め込んだ合成枕木が製品化されている。   Sleepers for railroad rails are widely used for wood and concrete. However, wood is inferior in durability against rain and the like, and concrete is excellent in durability, but is heavy and inferior in vibration and sound insulation. Therefore, synthetic sleepers in which hard urethane resin is used as a base material resin and glass long fibers or glass long fiber bundles are embedded are commercialized as sleepers to replace wood and concrete.

ガラス長繊維束は、直径が約２３μｍのガラス繊維（約４４００ＴＥＸのもの）をバインダ樹脂で束ねたものである。ガラス長繊維束の外径は、約２ｍｍである。ＴＥＸとは、長さ１０００ｍあたりの重量のことで、４４００ＴＥＸは、約４．４ｇ／ｍとなる。   The long glass fiber bundle is obtained by bundling glass fibers having a diameter of about 23 μm (about 4400 TEX) with a binder resin. The outer diameter of the long glass fiber bundle is about 2 mm. TEX is a weight per 1000 m in length, and 4400 TEX is about 4.4 g / m.

一般的に、レールは合成枕木にレール用ねじくぎで固定される。これに代わって、合成枕木に雌ねじを有する埋込栓を埋め込み、雌ねじに固定ボルトを螺合させてレールを固定する技術がある。特許文献１には、埋込栓を埋め込む埋設穴を角型とし、埋込穴の周囲に径を突出させた拡大部を設け、固定ボルトの引き抜き抵抗力を大きくすることが記載されている。特許文献２には、枕木に貫通孔を空け、貫通孔の下部に鍔の径に合致した拡径孔を設け、鍔付き雌ねじである埋込栓を拡径孔に挿入し、接着剤で固定して引き抜き抵抗力を大きくすることが記載されている。   Generally, a rail is fixed to a synthetic sleeper with a rail screw. As an alternative, there is a technique in which an embedded plug having a female screw is embedded in a synthetic sleeper and a rail is fixed by screwing a fixing bolt into the female screw. Patent Document 1 describes that an embedding hole for embedding an embedding plug is a square shape, and an enlarged portion having a diameter protruding around the embedding hole is provided to increase the pulling resistance force of the fixing bolt. In Patent Document 2, a through hole is made in a sleeper, an enlarged hole corresponding to the diameter of the flange is provided at the lower part of the through hole, an embedded plug which is a female screw with a hook is inserted into the enlarged hole, and fixed with an adhesive. It is described that the pulling resistance force is increased.

特許文献１では埋設穴が角型であり、特許文献２では両側から径の異なる穴が穿設されるので、いずれも穴の穿設工数が大きい。また、埋設栓の周囲は接着剤で固化されるので、埋込栓に引抜力や局部的な圧縮力が作用した場合、固化した接着剤にひび割れが発生して破損するおそれがある。鉄道用品は、長期間に亘り大きな荷重下におかれるため、本発明の構成は、このようなことがない効果が期待される。
特開平７−１８６０３号公報 特開２００２−１６１５０１号公報 In Patent Document 1, the embedded hole is a square shape, and in Patent Document 2, since holes having different diameters are drilled from both sides, the number of holes is large. In addition, since the periphery of the embedded plug is solidified with an adhesive, if a pulling force or a local compressive force acts on the embedded plug, the solidified adhesive may be cracked and damaged. Since railroad supplies are subjected to a large load for a long period of time, the configuration of the present invention is expected to have such an effect.
JP 7-18603 A Japanese Patent Laid-Open No. 2002-161501

本発明の目的は、合成枕木における埋込栓を固定する接着剤の硬化後の強度を増大させ、その支持力すなわち引き抜き抵抗力を向上させた合成枕木を提供することにある。   The objective of this invention is providing the synthetic sleeper which increased the strength after hardening of the adhesive agent which fixes the embedding stopper in a synthetic sleeper, and improved the supporting force, ie, drawing-out resistance.

上記の目的を達成するため、請求項１記載の発明による合成枕木は、ガラス長繊維束が長手方向に配置され樹脂で固められた合成枕木において、貫通雌ねじの底部に抜け防止ボルトで鍔を取り付けた埋込栓が、前記合成枕木に穿設された非貫通の下穴に挿入されるとともに、前記埋込栓の周囲に上下方向に沿って強化繊維束が埋め込まれて、エポキシ樹脂系接着剤、不飽和ポリエステル樹脂系接着剤またはビニルエステル系接着剤で固定されることを特徴とする。   In order to achieve the above object, the synthetic sleeper according to the first aspect of the present invention is a synthetic sleeper in which long glass fiber bundles are arranged in the longitudinal direction and hardened with a resin. The embedded plug is inserted into a non-penetrating pilot hole drilled in the synthetic sleeper, and a reinforcing fiber bundle is embedded in the vertical direction around the embedded plug, and an epoxy resin adhesive It is characterized by being fixed with an unsaturated polyester resin adhesive or a vinyl ester adhesive.

前記下穴の径は、前記雌ねじ外径の１．２５〜２倍の範囲にあることが好ましい。   The diameter of the pilot hole is preferably in the range of 1.25 to 2 times the external diameter of the female screw.

前記強化繊維束は、前記下穴と前記埋込栓の間に３０〜６０％の充填率で充填されることが好ましい。   The reinforcing fiber bundle is preferably filled at a filling rate of 30 to 60% between the prepared hole and the embedded plug.

本発明による請求項１の合成枕木によれば、埋込栓周囲の上下方向に、強化繊維束が埋め込まれるので、接着剤のみで強化繊維束が埋め込まれていない場合に比較し、埋込栓に螺合されるレール固定用の固定ボルトの引き抜き力を約９％程度向上させることができる。また、埋込栓の下穴は、円形の非貫通穴であるから加工工数も少ない。この強化繊維束は、タイプレートの圧縮力に対しても強くできる。   According to the synthetic sleeper of claim 1 according to the present invention, the reinforcing fiber bundle is embedded in the vertical direction around the embedded plug, so that the embedded plug is compared with the case where the reinforcing fiber bundle is not embedded only by the adhesive. The pull-out force of the fixing bolt for fixing the rail that is screwed to can be improved by about 9%. Moreover, since the prepared hole for the embedded plug is a circular non-through hole, the number of processing steps is small. This reinforcing fiber bundle can be strong against the compressive force of the tie plate.

請求項２の発明によれば、下穴の径をさらに大きくして強化繊維束を周囲に多量に配置しなくても、十分な強度を得ることができる。   According to invention of Claim 2, sufficient intensity | strength can be acquired even if the diameter of a pilot hole is enlarged further and a reinforcement fiber bundle is not arrange | positioned in large quantities around.

また、請求項３の発明によれば、強化繊維束は、埋込栓の周囲に密に詰め込む必要はなく、このような充填率であれば十分な強度を得ることができる。   According to the invention of claim 3, the reinforcing fiber bundle does not need to be tightly packed around the embedding plug, and a sufficient strength can be obtained with such a filling rate.

以下、図面を参照して本発明による合成枕木を説明する。   Hereinafter, a synthetic sleeper according to the present invention will be described with reference to the drawings.

図１は本発明による合成枕木の斜視図である。図１に示すように、合成枕木１００は、一例として幅が２４０ｍｍ、高さが１５０ｍｍ、奥行きが２４００ｍｍの矩形体に形成される。合成枕木１００は、径が約２ｍｍのガラス長繊維束１２が前後方向とほぼ同じ長さで水平に多数積層され、硬質ウレタン液で固められたものである。レール４は、合成枕木１００の前後にそれぞれ設置され、合成枕木１００に固定される。   FIG. 1 is a perspective view of a synthetic sleeper according to the present invention. As shown in FIG. 1, the synthetic sleeper 100 is formed in a rectangular body having a width of 240 mm, a height of 150 mm, and a depth of 2400 mm as an example. The synthetic sleeper 100 is obtained by laminating a large number of long glass fiber bundles 12 having a diameter of about 2 mm horizontally and substantially the same length as in the front-rear direction, and solidifying with a hard urethane liquid. The rails 4 are respectively installed before and after the synthetic sleeper 100 and are fixed to the synthetic sleeper 100.

図２は、図１の前方側のレール４を右から左方向に見た側面図で、タイプレート２を介して合成枕木１００にレール４が取り付けられた例である。図２に示すように、レール４は、レール締結用座金３でタイプレート２に固定される。そしてタイプレート２は、固定ボルト１を通して合成枕木１００に固定される。埋込栓６は、中央を貫通する雌ねじ１０が設けられ、その底部には、鍔７が抜け防止ボルト９と雌ねじ１０の螺合により取り付けられる。そして埋込栓６は、非貫通の下穴１１に挿入される。埋込栓６の周囲には、強化繊維束５が、上下方向に埋め込まれ接着剤で固定される。固定ボルト１は、ワッシャーとタイプレートを介して雌ねじ１０に螺合される。このような構造によりタイプレート２が合成枕木１００に固定される。なお、非貫通孔の下孔１１は、座ぐりによる穴あけ加工によって形成される。また、埋込栓６の周囲上下方向に設けられた強化繊維束５は、長さが１２０ｍｍ程度であるので、短繊維であってもよく、前述のガラス長繊維束でもよい。他のカーボン繊維などを使用してもよい。本実施例では、ガラス長繊維束を使用した。   FIG. 2 is a side view of the front rail 4 of FIG. 1 as viewed from the right to the left, and is an example in which the rail 4 is attached to the synthetic sleeper 100 via the tie plate 2. As shown in FIG. 2, the rail 4 is fixed to the tie plate 2 with a rail fastening washer 3. The tie plate 2 is fixed to the synthetic sleeper 100 through the fixing bolt 1. The embedding plug 6 is provided with a female screw 10 penetrating through the center, and a flange 7 is attached to the bottom thereof by screwing of a bolt 9 and the female screw 10. The embedded plug 6 is inserted into the non-penetrating pilot hole 11. A reinforcing fiber bundle 5 is embedded in the vertical direction around the embedded plug 6 and fixed with an adhesive. The fixing bolt 1 is screwed into the female screw 10 via a washer and a tie plate. With such a structure, the tie plate 2 is fixed to the synthetic sleeper 100. The pilot hole 11 of the non-through hole is formed by drilling with a counterbore. The reinforcing fiber bundle 5 provided in the vertical direction around the embedded plug 6 has a length of about 120 mm, and thus may be a short fiber or the above-described glass long fiber bundle. Other carbon fibers may be used. In this example, a long glass fiber bundle was used.

図３は、図１に示す合成枕木の埋込栓周りのＡ−Ａ断面図である。合成枕木１００には、ガラス長繊維束１２が、図３に示すように、合成枕木１００の長手方向つまり前後方向に沿って埋め込まれている。合成枕木１００の下穴１１に埋込栓６が埋設され、その周囲には強化繊維束５が埋込栓６の上下方向に沿って配列され、エポキシ樹脂接着剤、不飽和ポリエステル樹脂系接着剤またはビニルエステル樹脂系接着剤で固定されている。埋込栓６には、固定ボルト１が螺合する雌ねじ１０を有する。雌ねじ１０の下部には、円板状の鍔７に通された抜け防止ボルト９が螺合されている。合成枕木１００の高さは、約１５０ｍｍで、下穴１１の深さが１３８ｍｍ、下穴１１の径（符号ｄで示す）は６０ｍｍ、鍔７の径は５８ｍｍ、鍔９の厚さは９ｍｍとした。なお、寸法は一例であって、これに限るものではない。また、鍔７は、円形の他に多角形や正方形としてもよい。   FIG. 3 is a cross-sectional view taken along the line AA around the embedded plug of the synthetic sleeper shown in FIG. In the synthetic sleeper 100, the long glass fiber bundle 12 is embedded along the longitudinal direction of the synthetic sleeper 100, that is, the front-rear direction, as shown in FIG. An embedded plug 6 is embedded in the pilot hole 11 of the synthetic sleeper 100, and a reinforcing fiber bundle 5 is arranged around the embedded plug 6 along the vertical direction of the embedded plug 6, and an epoxy resin adhesive and an unsaturated polyester resin adhesive. Or it is fixed with a vinyl ester resin adhesive. The embedded plug 6 has a female screw 10 into which the fixing bolt 1 is screwed. At the lower part of the female screw 10, a drop prevention bolt 9 passed through a disk-shaped flange 7 is screwed. The height of the synthetic sleeper 100 is about 150 mm, the depth of the pilot hole 11 is 138 mm, the diameter of the pilot hole 11 (indicated by the symbol d) is 60 mm, the diameter of the flange 7 is 58 mm, and the thickness of the flange 9 is 9 mm. did. In addition, a dimension is an example and is not restricted to this. Further, the ridge 7 may be a polygon or a square in addition to a circle.

図４は、図１に示す合成枕木の埋込栓周りのＢ−Ｂ断面図である。図４は、埋込栓６を左右方向に切断したもので、下穴１１の周囲には、合成枕木１００に埋め込まれたガラス長繊維束１２の径の断面が見える。図４に示すように、下穴１１には埋込栓６が挿入され、その周囲には強化繊維束５が上下方向に沿って埋め込まれ、エポキシ樹脂接着剤、不飽和ポリエステル樹脂系接着剤またはビニルエステル樹脂系接着剤で固定されている。   4 is a cross-sectional view of the synthetic sleeper shown in FIG. FIG. 4 shows the embedded plug 6 cut in the left-right direction. A section of the diameter of the long glass fiber bundle 12 embedded in the synthetic sleeper 100 can be seen around the pilot hole 11. As shown in FIG. 4, an embedded plug 6 is inserted into the pilot hole 11, and a reinforcing fiber bundle 5 is embedded in the periphery along the vertical direction, and an epoxy resin adhesive, an unsaturated polyester resin adhesive or It is fixed with vinyl ester resin adhesive.

図５は、図１に示す合成枕木の埋込栓周りの平面図である。下穴１１の周囲には、前後方向（合成枕木の長手方向）にガラス長繊維束１２が配列されている。埋込栓６の周囲には、埋込栓６の長手方向に沿った強化繊維束５の径の断面が見える。雌ねじ１０には固定ボルト１が螺合される。下穴１１の径は６０ｍｍで、雌ねじ１０の外径（３２ｍｍ）の約２倍とした。   FIG. 5 is a plan view around the embedded plug of the synthetic sleeper shown in FIG. A long glass fiber bundle 12 is arranged around the pilot hole 11 in the front-rear direction (longitudinal direction of the synthetic sleeper). A section of the diameter of the reinforcing fiber bundle 5 along the longitudinal direction of the embedded plug 6 can be seen around the embedded plug 6. The fixing bolt 1 is screwed onto the female screw 10. The diameter of the pilot hole 11 was 60 mm, which was about twice the outer diameter (32 mm) of the female screw 10.

図６は、強化繊維束の埋め込み方向と圧縮強度の関係を調べる試験の概略図である。エポキシ樹脂接着剤に約３７％の強化繊維束５を含ませて硬化した試験体と、繊維束を含まない試験体とを使用して、（Ａ）強化繊維束５の繊維方向（上下）に圧縮した試験と、（Ｂ）強化繊維束５の繊維方向と直交する方向（横）に圧縮した試験を実施した。Ｐは最大荷重（Ｎ）を示す。荷重のかかる面積Ｓはａ×ａ（ｍｍ２）である。圧縮強さはＰ／Ｓで算出できる。このような試験によれば、（Ａ）は、ａを３０ｍｍとして、強化繊維束５を含まない試験体が７２．２Ｎ／ｍｍ２に対し、強化繊維束５を含んだ試験体は１６０．６Ｎ／ｍｍ２であり、縦方向の圧縮強度はおよそ２倍となる。（Ｂ）は、ａを２０ｍｍ、Ｐを３７．５ｋＮとして、強化繊維束５を含まない試験体への食込み量０．６ｍｍに対して、強化繊維束５を含んだ試験体は０．０５ｍｍであり、食込み量は１／１０程度に小さくなる。 FIG. 6 is a schematic diagram of a test for examining the relationship between the embedding direction of the reinforcing fiber bundle and the compressive strength. Using a test body cured by including about 37% reinforcing fiber bundle 5 in an epoxy resin adhesive and a test body not including the fiber bundle, (A) in the fiber direction (up and down) of the reinforcing fiber bundle 5 A compressed test and (B) a test compressed in a direction (lateral) perpendicular to the fiber direction of the reinforcing fiber bundle 5 were performed. P represents the maximum load (N). The area S on which the load is applied is a × a (mm 2 ). The compressive strength can be calculated by P / S. According to such a test, in (A), a is 30 mm, the test body not including the reinforcing fiber bundle 5 is 72.2 N / mm 2, whereas the test body including the reinforcing fiber bundle 5 is 160.6 N / Mm 2 and the compressive strength in the longitudinal direction is approximately doubled. In (B), a is 20 mm, P is 37.5 kN, and the test specimen including the reinforcing fiber bundle 5 is 0.05 mm with respect to the amount of biting into the test specimen not including the reinforcing fiber bundle 5 is 0.6 mm. Yes, the amount of biting is reduced to about 1/10.

従って、図２に示すような埋込栓６を有する合成枕木１００の構造は、タイプレート２の固定ボルト１を通す穴径が２５ｍｍであるから、例えば径が６０ｍｍの下穴１１に挿入された埋込栓６周囲の上下方向の強化繊維束５に対して圧縮力が作用し、縦方向の荷重に強い大きな圧縮強度を持たせることができる。加えて、車輪がレール長手方向に対して直角方向（水平）に作用する横圧は、レールからタイプレート２、固定ボルト１を介して強化繊維束５の繊維方向とは直交する方向に圧縮力として作用するから、横方向の荷重にも強く、その変位を小さなものとすることができる。埋込栓６の周囲に設けられた上下方向の強化繊維束５は、固定ボルト１の引抜き抵抗力も向上させる。これを次に示す。   Accordingly, the structure of the synthetic sleeper 100 having the embedded plug 6 as shown in FIG. 2 has a hole diameter of 25 mm through which the fixing bolt 1 of the tie plate 2 is passed. A compressive force acts on the reinforcing fiber bundle 5 in the vertical direction around the embedded plug 6 and can have a large compressive strength that is strong against a load in the vertical direction. In addition, the lateral pressure acting on the wheel in a direction perpendicular to the rail longitudinal direction (horizontal) is a compressive force in a direction perpendicular to the fiber direction of the reinforcing fiber bundle 5 through the tie plate 2 and the fixing bolt 1 from the rail. Therefore, it is strong against a lateral load, and its displacement can be made small. The up-and-down reinforcing fiber bundle 5 provided around the embedded plug 6 also improves the pull-out resistance of the fixing bolt 1. This is shown below.

図７は、固定ボルトの引き抜き試験の方法を示す概略図である。埋込栓６にＭ２０の固定ボルト１を首下３０ｍｍまで締め込み、固定ボルト１に引抜荷重Ｐｔをかけた。また、その時の、枕木上面の浮き上り量つまり距離ｇを測定した。枕木の押え治具の開口部の幅ｆは、下穴１１の径より大きくし、ｆは６５ｍｍとした。固定ボルト１に伝えられた力は、雌ねじ１０を介して、抜け防止ボルト９に伝えられ、鍔７が上方に持ち上げられるように作用する。この試験では、ｆを６５ｍｍとして、下穴１１の径６０ｍｍより大きくしたので、埋込栓６の周囲、上下方向の強化繊維束５の付近で引きはがされるものとなる。つまり、上下方向の強化繊維束５には圧縮力を掛けない悪い条件で試験をした。   FIG. 7 is a schematic view showing a method of a pull-out test for fixing bolts. The fixing bolt 1 of M20 was tightened to the embedded plug 6 to 30 mm below the neck, and a pulling load Pt was applied to the fixing bolt 1. At that time, the floating amount of the upper surface of the sleeper, that is, the distance g was measured. The width f of the opening of the sleeper pressing jig was made larger than the diameter of the pilot hole 11, and f was 65 mm. The force transmitted to the fixing bolt 1 is transmitted to the drop prevention bolt 9 via the female screw 10 and acts so that the flange 7 is lifted upward. In this test, f was 65 mm and the diameter of the pilot hole 11 was larger than 60 mm, and therefore, it was peeled around the embedded plug 6 and in the vicinity of the reinforcing fiber bundle 5 in the vertical direction. That is, the test was performed under bad conditions in which the compressive force was not applied to the reinforcing fiber bundle 5 in the vertical direction.

図８は、固定ボルト引き抜き試験Ｔ１、Ｔ２における最大抵抗力の測定結果である。試験Ｔ１は、上下方向に強化繊維束５がある場合である。試験Ｔ２は、上下方向の強化繊維束５がない場合である。最大引き抜き力は、Ｔ１が１６６．５ｋＮ／ｍｍ２、Ｔ２が１５３．１ｋＮ／ｍｍ２であった。Ｔ１はＴ２より８．７％改善される。Ｔ２は上下方向の強化繊維束５がないので、Ｔ１のように上下方向に強化繊維束５を入れると固定ボルト１が引き抜き難くなることを意味する。上下方向の強化繊維束５の下穴１１と埋込栓６との間の充填率は、約５５％とした。充填率が低いと上下方向の強化繊維束５が倒れやすく強化繊維束の効果が出にくくなる。 FIG. 8 shows measurement results of the maximum resistance force in the fixing bolt pull-out tests T1 and T2. Test T1 is a case where the reinforcing fiber bundle 5 is present in the vertical direction. Test T2 is a case where there is no reinforcing fiber bundle 5 in the vertical direction. Maximum pulling force, T1 is 166.5kN / mm 2, T2 was 153.1kN / mm 2. T1 is 8.7% better than T2. Since T2 has no reinforcing fiber bundle 5 in the vertical direction, it means that it is difficult to pull out the fixing bolt 1 when the reinforcing fiber bundle 5 is inserted in the vertical direction as in T1. The filling rate between the prepared hole 11 of the reinforcing fiber bundle 5 in the vertical direction and the embedded plug 6 was about 55%. When the filling rate is low, the reinforcing fiber bundle 5 in the vertical direction is likely to fall down, and the effect of the reinforcing fiber bundle is difficult to be obtained.

図９は、固定ボルト引き抜き試験Ｔ１、Ｔ２において、引抜き荷重Ｐ＝１００ｋＮをかけた時の浮き上り量の測定結果である。浮き上り量は、Ｔ１が１．４１ｍｍ、Ｔ２が１．５０ｍｍであった。Ｔ１はＴ２より６．４％改善される。Ｔ２は上下方向に強化繊維束５がないので、Ｔ１のように上下方向に強化繊維束５を入れると固定ボルトが引き抜き難くなることを意味する。   FIG. 9 shows the measurement results of the floating amount when a pulling load P = 100 kN is applied in the fixing bolt pulling tests T1 and T2. The amount of lifting was 1.41 mm for T1 and 1.50 mm for T2. T1 is 6.4% better than T2. Since T2 has no reinforcing fiber bundle 5 in the vertical direction, it means that it is difficult to pull out the fixing bolt when the reinforcing fiber bundle 5 is inserted in the vertical direction as in T1.

本発明の合成枕木は、鉄道レールの固定に好適である。   The synthetic sleeper of the present invention is suitable for fixing railroad rails.

本発明による合成枕木の斜視図である。（実施例１）It is a perspective view of the synthetic sleeper by this invention. Example 1 本発明による合成枕木にレールが取り付けられた例である。It is the example where the rail was attached to the synthetic sleeper by this invention. 図１に示す合成枕木の埋込栓周りのＡ−Ａ断面図である。（実施例１）It is AA sectional drawing around the embedding stopper of the synthetic sleeper shown in FIG. Example 1 図１に示す合成枕木の埋込栓周りのＢ−Ｂ断面図である。（実施例１）It is BB sectional drawing around the embedding stopper of the synthetic sleeper shown in FIG. Example 1 図１に示す合成枕木の埋込栓周りの平面図である。（実施例１）It is a top view around the embedding stopper of the synthetic sleeper shown in FIG. Example 1 強化繊維束の埋め込み方向と圧縮強度の関係を調べる試験の概略図である。It is the schematic of the test which investigates the relationship between the embedding direction of a reinforcing fiber bundle, and compressive strength. 固定ボルトの引き抜き試験の方法を示す概略図である。It is the schematic which shows the method of the pull-out test of a fixing bolt. 固定ボルト引き抜き試験Ｔ１、Ｔ２における最大抵抗力の測定結果である。It is a measurement result of the maximum resistance force in fixed bolt pull-out tests T1 and T2. 固定ボルト引き抜き試験Ｔ１、Ｔ２における浮き上り量の測定結果である。It is a measurement result of the amount of floating in fixed bolt pull-out test T1 and T2.

符号の説明Explanation of symbols

１ 固定ボルト
２ タイプレート
３ レール締結用座金
４ レール
５ 強化繊維束
６ 埋込栓
７ 鍔
８ 接着剤
９ 抜け防止ボルト
１０ 雌ねじ
１１ 下穴
１２ ガラス長繊維束
４０ 試験体１
５０ 試験体２
１００ 合成枕木
Ｐ 圧縮荷重
Ｐｔ 引抜荷重 DESCRIPTION OF SYMBOLS 1 Fixing bolt 2 Tie plate 3 Washer for rail fastening 4 Rail 5 Reinforcing fiber bundle 6 Embedded stopper 7 鍔 8 Adhesive 9 Retaining prevention bolt 10 Female screw 11 Pilot hole 12 Glass long fiber bundle 40 Test specimen 1
50 Specimen 2
100 Synthetic sleepers P Compressive load Pt Pull-out load

Claims (3)

ガラス長繊維束が長手方向に配置され樹脂で固められた合成枕木において、
貫通雌ねじの底部に抜け防止ボルトで鍔を取り付けた埋込栓が、前記合成枕木に穿設された非貫通の下穴に挿入されるとともに、前記埋込栓の周囲に上下方向に沿って強化繊維束が埋め込まれて、エポキシ樹脂系接着剤、不飽和ポリエステル樹脂系接着剤またはビニルエステル系接着剤で固定されることを特徴とする合成枕木。 In a synthetic sleeper in which long glass fiber bundles are arranged in the longitudinal direction and hardened with resin,
An embedding plug with a hook attached to the bottom of the penetrating female screw is inserted into a non-penetrating pilot hole drilled in the synthetic sleeper and reinforced along the vertical direction around the embedding plug A synthetic sleeper in which a fiber bundle is embedded and fixed with an epoxy resin adhesive, an unsaturated polyester resin adhesive, or a vinyl ester adhesive. 前記下穴の径は、前記雌ねじ外径の１．２５〜２倍の範囲にあることを特徴とする請求項１に記載の合成枕木。   The synthetic sleeper according to claim 1, wherein the diameter of the pilot hole is in a range of 1.25 to 2 times the outer diameter of the female screw. 前記強化繊維束は、前記下穴と前記埋込栓の間に３０〜６０％の充填率で充填されることを特徴とする請求項１に記載の合成枕木。   The synthetic sleeper according to claim 1, wherein the reinforcing fiber bundle is filled between the prepared hole and the embedded plug at a filling rate of 30 to 60%.
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