JP4820968B2 - Synthetic sleeper and manufacturing method thereof - Google Patents

Synthetic sleeper and manufacturing method thereof Download PDF

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JP4820968B2
JP4820968B2 JP2000202615A JP2000202615A JP4820968B2 JP 4820968 B2 JP4820968 B2 JP 4820968B2 JP 2000202615 A JP2000202615 A JP 2000202615A JP 2000202615 A JP2000202615 A JP 2000202615A JP 4820968 B2 JP4820968 B2 JP 4820968B2
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fiber bundle
fiber
cured
resin
mold
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JP2002021002A (en
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水 浩 文 清
坂 匡 石
村 朗 北
岸 健 峰
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NHK Spring Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、鉄道線路用のまくらぎ、特に強化長繊維を束ねた繊維束（以後「繊維束」と略す）によって補強された合成まくらぎおよびその製造方法に関するものである。
【０００２】
【従来の技術】
鉄道用のまくらぎには、木材やコンクリートが広く用いられてきた。しかし、木材は雨水を受けて朽ち、損傷を受けるなど耐久性が劣り、さらに資源的にも限られているという問題がある。コンクリートは丈夫で、資材の入手も容易、安定しているが、重く、防振性や防音性に劣っている。
【０００３】
そこで木材やコンクリートに代わるまくらぎとして、硬質発泡ウレタン樹脂などを母材樹脂として、長繊維で強化した複合材料を用いた所謂「合成まくらぎ」が提案された〔実公昭６１−２３００４２号公報〕。さらに合成まくらぎについて、まくらぎ上部および下部で強化繊維の密度を高くして強度を維持し、全体で強化繊維の含有量を減らすことで軽量化を図るという提案〔特開平５−１３８７９７号公報〕、強化繊維を束にまとめ繊維束とし、これを母材樹脂に分散させ強度の向上を図る提案〔特開２０００−１２０００１号公報〕などその改良が図られている。
【０００４】
【発明が解決しようとする課題】
合成まくらぎは、強化長繊維あるいは強化長繊維の束を、母材樹脂と混合し、金型中で硬化させて製造する。このとき、強化長繊維あるいは繊維束は母材樹脂中に均一に分布していることが必要で、不均一に分布していると、部分的に繊維あるいは繊維束が少ない場所ができ、まくらぎとしたとき、その部分に犬くぎが打ち込まれると引き抜き強度が満たされないという問題が発生する。
【０００５】
このように母材樹脂中で繊維あるいは繊維束が均一に分布されないのは、繊維あるいは繊維束同志が重なり合い、それらの間に母材樹脂が入り込まないことが原因である。繊維束は均一性を改善するために繊維の代わりに用いられたものであるが、依然として繊維束が部分的に偏在するという問題があり、そこで繊維束と母材樹脂を一度に混ぜないで、成形途中で数回に分けて混合するなどの方法が採られているが、それでも、繊維束の沈み、母材樹脂の硬化の時間差、それに伴う粘度の不均一などから繊維束の問題を有していた。
【０００６】
本発明は、上記の問題点を解決し、品質の向上した合成まくらぎ、および繊維束の分散が容易、かつ均一分散ができる合成まくらぎの製造方法を提供するものである。
【０００７】
【課題を解決するための手段】
本発明者らは、繊維束を均一に分散させる方法について鋭意研究を行った結果、繊維束表面に突起部を作ると、繊維束同志の重なり合いが緩和され、母材樹脂が入り込む間隙を作り、これにより繊維束が母材樹脂中に均一に分散されることを見出し本発明をなすに至った。
【０００８】
すなわち、本発明の合成まくらぎは、直径が１５〜２０μｍの強化長繊維が５０００〜１００００本束ねられバインダ樹脂に含浸、硬化された繊維束の複数本を母材樹脂に分散、硬化させた合成まくらぎであって、前記繊維束には、長手方向に繊維束径方向の外形寸法に対し５０倍〜２５０倍となる所定の間隔をおいて、繊維束の前記外形寸法に対して１．２〜３．０倍となる所定の最大外形寸法で外側に突出する突起部が前記繊維束が完全硬化する前に繊維束を押圧して扁平部分を形成させた後硬化することによって設けられており、前記突起部が設けられた繊維束が金型中に金型深さの７０％以上の嵩高さで積み重ねられた状態で、前記金型中に母材樹脂が一度に加えられ、前記母材樹脂が繊維束間の隙間に浸透してから硬化され、繊維束が均一に分散していることを特徴とする。
【０００９】
これにより、繊維束同志の重なり合いが緩和され、母材樹脂が入り込む間隙を作り、繊維束を母材樹脂中に均一に分散させることができ、製造された合成まくらぎの品質は一段と向上する。
【００１０】
また、本発明の合成まくらぎの製造方法は、直径が１５〜２０μｍの強化長繊維を５０００〜１００００本束ねてバインダ樹脂に含浸、硬化した繊維束の複数本を母材樹脂に分散、硬化させる合成まくらぎの製造方法であって、前記繊維束には、長手方向に繊維束径方向の外形寸法に対し５０倍〜２５０倍となる所定の間隔をおいて、繊維束の前記外形寸法に対して１．２〜３．０倍となる所定の最大外形寸法で外側に突出する突起部を前記繊維束が完全硬化する前に繊維束を押圧して扁平部分を形成させた後硬化することによって設けておき、前記突起部を設けた繊維束を金型中に金型深さの７０％以上の嵩高さで積み重ねた状態で、前記金型中に母材樹脂を一度に加え、前記母材樹脂が繊維束間の隙間に浸透してから硬化させることを特徴とする。
【００１１】
これにより、繊維束同志の重なり合いが緩和され、母材樹脂が入り込む間隙を作り、繊維束を母材樹脂中に均一に分散させることができ、容易に、かつ品質の優れた合成まくらぎを製造することができる。
【００１２】
【発明の実施の形態】
この実施の形態における繊維束１は、図１に示すように、直径が１５〜２０μｍ程度の強化長繊維２を５０００〜１００００本束ねることにより製造される。この強化繊維２に対し１０％程度（重量比）のバインダ樹脂３に含浸させた後加熱して硬化させ、所定の長さに切断して製造される。バインダ樹脂３は、不飽和ポリエステル樹脂、エポキシ樹脂、ポリスチレン樹脂、アクリル樹脂、フェノール樹脂、尿素樹脂などが使用される。強化長繊維２は、ガラス長繊維が良好であるが、その他芳香族ポリアミド（アラミド）繊維、炭素繊維などであってもよい。繊維束１の直径は約２ｍｍ程度，長さは使用目的により異なるが２〜８ｍである。
【００１３】
以上に加えて、この実施の形態の繊維束１は、繊維束１の長手方向に外側に突出する突起部４、５が設けられている。すなわち、図２、３に示すように繊維束１の長手方向に対し、適宜の間隔に突起部４，５を突出させるものである。図２（ａ）は、繊維束１を押圧して扁平部分を形成させた後硬化することにより突出部４を形成させており、（ｂ）（ｃ）は、その断面図である。繊維束１上に突起部４を作るには、例えば、繊維束１を完全硬化させる前に繊維束１の一部分を押圧して扁平にさせることにより作製することができる。
【００１４】
図３（ａ）は、繊維束１の外面に樹脂を付着して硬化することにより突起部５を形成させており、（ｂ）は、その断面図である。繊維束１上に突起部５を作るには、例えば、繊維束１の一部分に常温硬化型の樹脂を付着し硬化させることにより達成される。ここで使用される常温硬化型の樹脂として、不飽和ポリエステル樹脂、エポキシ樹脂、アクリル樹脂、フェノール樹脂、尿素樹脂などがある。
【００１５】
図２、３において、ａは突起部のない部分の径方向の外形寸法、ｂは突起部の内で最も大きい部分の径方向の外形寸法、ｃは、突起部間の間隔の長さである。
【００１６】
繊維束１上の突起部間の間隔ｃは、代表的には１００〜５００ｍｍである。突起部４，５の径方向の外形寸法ｂは、突起部のない部分の繊維束外形寸法ａに対し、１．２〜３．０倍、好ましくは１．５〜２．５倍である。またその形状は、繊維束１を取り囲むように全円周に亘ってもよいし、あるいは円周の一部であってもよい。さらに、円周の一部の場合にその向きは、互いに同じでもよいし、また異なっていてもよい。ここに挙げた突起部４，５間の間隔、大きさ、形状は、本発明の目的とする効果が大きいという観点から選ばれたもので、本発明はこれらに限定されるものではない。
【００１７】
図４（ａ）は、この実施の形態の繊維束１を金型７中に積み重ねた状態を示したものを、図４（ｂ）は従来の繊維束１１を金型７中に積み重ねた状態を示している。図４（ａ）、（ｂ）は、それぞれ同数の繊維束１，１１を積み重ねた状態であるが、この実施の形態の繊維束１は、繊維束１の周囲に突起部４，５があることからすきまができ、嵩高になっている。
【００１８】
図５（ａ）は、この実施の形態の繊維束１を用いて製造した合成まくらぎ９の概念図であり、図５（ｂ）は、従来の繊維束１１を用いて製造した合成まくらぎ１９の概念図である。
【００１９】
合成まくらぎの製造は、本発明では特に限定するものではなく、種々の方法を用いることができる。すなわち、金型に繊維束を入れ、この中に母材樹脂を加え、母材樹脂が繊維束に充分浸透してからこれを硬化させる。このとき、従来は、繊維束１１の分散が良くなかったことから繊維束１１と母材樹脂８を成形途中で数回に分けて混合するなどの方法が採られることがあったが、この実施の形態の繊維束１は、繊維束１周囲に突起部４，５があることから繊維束１間に隙間ができ、そこに母材樹脂８が浸透していくので、繊維束１の均一分散が容易となる。従って、繊維束１と母材樹脂８を分けて混合する必要がなく、繊維束１に母材樹脂８を一度に入れることでも充分満足のいく均一性が得られる。
【００２０】
図５（ａ）に示すように、突起部４，５を有した繊維束１を用いて製造した合成まくらぎ９は、繊維束１間に隙間ができ、そこに母材樹脂８が浸透し繊維束１の均一分散が可能となっている。これに対し、従来の合成まくらぎ１９は、繊維束１１が、図５（ｂ）に示すように積み重ねが密になり隙間がなく、母材樹脂８の浸透できないところができて分散が不均一となっている。このように、表面や内部に繊維束１１が少なく、母材樹脂８だけの部分があると、その部分は犬くぎ引き抜き強度が低くなり、まくらぎとして使えなくなる。
【００２１】
発明者らの実験では、繊維束を所定本数金型に積層した時の嵩高さが、金型深さの７０％以上であれば繊維束間に母材樹脂が浸透するに充分な隙間が確保されていた。このように繊維束を金型深さの７０％以上の嵩高さにするには、突起部４，５の大きさが、突起部のない部分の外形寸法に対し、１．２〜３．０倍突出するときであった。
【００２２】
この実施の形態では、外側に突出する突起部４，５のある繊維束１を使うことにあるが、この実施の形態の効果が損なわれない範囲において、従来の突起部のない繊維束１１を一部混合して使用することを制限するものではない。
【００２３】
【実施例】
金型７に繊維束１，１１を入れ、この上から母材樹脂８として硬質発泡ウレタン樹脂を入れて、試験用合成まくらぎ９，１９を製造した。繊維束１，１１と硬質発泡ウレタン樹脂の比は５０：５０（重量比）とした。この合成まくらぎ９，１９について、犬くぎ引き抜き試験を行った。結果を表１に示した。尚、実施例の試験体１〜３は繊維束１に突起部４（間隔：２５０ｍｍ、突起部で最も大きい外形寸法は突起部のないところの外形寸法の２．０倍）をつけたもの、試験体４〜５は繊維束１に突起部５（間隔：２５０ｍｍ、突起部の外形寸法は突起部のないところの外形寸法の２．２倍）をつけたものである。
【００２４】
犬くぎの引き抜き試験は、試験体〔１４０×２００×７００ｍｍ〕に、直径１５ｍｍ、深さ１１０ｍｍの下穴をせん孔し、スパイキハンマにより犬くぎ〔ＪＩＳ Ｅ １１０８、Ｌ＝１３０ｍｍ〕を首下２０ｍｍまで打ち込み、次いでＪＩＳ Ｚ ２１０１に準拠して引き抜き試験を行い、引き抜き強度を測定した。
【００２５】
【表１】

Figure 0004820968
【００２６】
合成まくらぎの犬くぎ引き抜き強度は、１５ｋＮがその合格の目安となっている。従来の繊維束１１を用いて製作した合成まくらぎ１９では、１５ｋＮ以上の仕様は満足しているもののその値は低く、ばらつきも多かったが、本発明の繊維束１を用いることにより犬くぎ引き抜き強度の安定性が大幅に改善された。
【００２７】
【発明の効果】
本発明によると、繊維束同志の重なり合いが緩和され、母材樹脂が入り込む間隙を作り、繊維束を母材樹脂中に均一に分散させることができ、製造された合成まくらぎの品質は一段と向上させることができる。
【図面の簡単な説明】
【図１】 繊維束の断面図である。
【図２】 （ａ）は、突起部を形成した繊維束の斜視図、（ｂ）は、（ａ）のＸ−Ｘ線断面図、（ｃ）は、Ｙ−Ｙ線断面図である。
【図３】 （ａ）は、別の突起部を形成した繊維束の斜視図、（ｂ）は、（ａ）のＺ−Ｚ線断面図である。
【図４】 （ａ）は、突起部を有する繊維束を積み重ねた状態の断面図、（ｂ）は、突起部のない繊維束を積み重ねた状態の断面図である。
【図５】 （ａ）は、突起部を有する繊維束を用いて製作した合成まくらぎの斜視図、（ｂ）は、従来の繊維束を用いて製作した合成まくらぎの斜視図である。
【符号の説明】
１：繊維束
２：強化長繊維
３：バインダー樹脂
４：突起部
５：突起部
７：金型
８：母材樹脂
９：合成まくらぎ
１１：従来の繊維束
１９：従来の合成まくらぎ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sleeper for railroad tracks, and more particularly to a synthetic sleeper reinforced by a fiber bundle in which reinforcing long fibers are bundled (hereinafter abbreviated as “fiber bundle”) and a method for manufacturing the same.
[0002]
[Prior art]
Wood and concrete have been widely used for railway sleepers. However, there is a problem that timber is deteriorated due to rain water, is inferior in durability such as being damaged, and is limited in terms of resources. Concrete is strong and easily available and stable, but heavy and inferior in vibration and sound insulation.
[0003]
Therefore, as a sleeper to replace wood and concrete, a so-called “synthetic sleeper” using a composite material reinforced with long fibers using a hard foamed urethane resin or the like as a base resin was proposed (Japanese Utility Model Publication No. 61-230042). . Further, with respect to synthetic sleepers, a proposal to reduce the weight by increasing the density of reinforcing fibers at the upper and lower portions of the sleepers to maintain the strength and reducing the content of reinforcing fibers as a whole [Japanese Patent Laid-Open No. 5-13897 ] Improvements such as a proposal [JP-A 2000-12001], in which reinforcing fibers are bundled into a fiber bundle and dispersed in a matrix resin to improve the strength, have been attempted.
[0004]
[Problems to be solved by the invention]
Synthetic sleepers are manufactured by mixing reinforcing long fibers or bundles of reinforcing long fibers with a base resin and curing them in a mold. At this time, it is necessary for the reinforcing long fibers or fiber bundles to be uniformly distributed in the base resin, and if they are unevenly distributed, there will be areas where there are few fibers or fiber bundles, and sleepers Then, when a dog nail is driven into that portion, there arises a problem that the pulling strength is not satisfied.
[0005]
The reason why the fibers or fiber bundles are not uniformly distributed in the base material resin is that the fibers or fiber bundles overlap each other and the base material resin does not enter between them. The fiber bundle is used instead of the fiber to improve the uniformity, but there is still a problem that the fiber bundle is partially unevenly distributed, so do not mix the fiber bundle and the base resin at one time, A method such as mixing several times during the molding is adopted, but it still has problems with the fiber bundle due to the sinking of the fiber bundle, the time difference in curing of the base resin, and the accompanying nonuniform viscosity. It was.
[0006]
The present invention solves the above problems and provides a synthetic sleeper with improved quality and a method for producing a synthetic sleeper that facilitates uniform dispersion of fiber bundles.
[0007]
[Means for Solving the Problems]
As a result of diligent research on a method for uniformly dispersing a fiber bundle, the inventors have made a protrusion on the surface of the fiber bundle, which reduces the overlap of the fiber bundles and creates a gap for the base resin to enter. As a result, the present inventors have found that the fiber bundle is uniformly dispersed in the base material resin and has made the present invention.
[0008]
That is, the synthetic sleeper of the present invention is a synthetic sleeper in which 5,000 to 10,000 reinforced long fibers having a diameter of 15 to 20 μm are bundled and impregnated in a binder resin, and a plurality of cured fiber bundles are dispersed and cured in a base material resin. It is a sleeper, and the fiber bundle has a predetermined interval of 50 to 250 times the outer dimension in the fiber bundle radial direction in the longitudinal direction, and 1.2% of the outer dimension of the fiber bundle. protruding portion protruding outward the fiber bundle is provided et been by curing after forming the pressure to flattened section of the fiber bundle prior to complete cure at a predetermined maximum external dimension which is a 3.0-fold The base material resin is added to the mold at a time in a state where the fiber bundle provided with the protrusions is stacked in the mold with a bulkiness of 70% or more of the mold depth, and the mother resin The material resin penetrates into the gaps between the fiber bundles and is then cured Wherein the are uniformly dispersed.
[0009]
As a result, the overlapping of the fiber bundles is relaxed, a gap into which the base material resin enters can be created, and the fiber bundle can be uniformly dispersed in the base material resin, so that the quality of the manufactured synthetic sleeper is further improved.
[00 10 ]
In the synthetic sleeper manufacturing method of the present invention, 5000 to 10,000 reinforcing long fibers having a diameter of 15 to 20 μm are bundled , impregnated in a binder resin, and a plurality of cured fiber bundles are dispersed and cured in a base material resin. A synthetic sleeper manufacturing method, wherein the fiber bundle has a predetermined interval of 50 to 250 times the outer dimension in the fiber bundle radial direction in the longitudinal direction, and the outer dimension of the fiber bundle. Protrusions protruding outward with a predetermined maximum outer dimension of 1.2 to 3.0 times are provided by pressing the fiber bundle to form a flat portion before the fiber bundle is completely cured, and then curing it. The base material resin is added to the mold at a time in a state where the fiber bundles provided with the protrusions are stacked in the mold at a bulkiness of 70% or more of the mold depth, and the base resin solving but Rukoto cured after penetration into gaps between the fiber bundles To.
[00 11 ]
This alleviates the overlap between the fiber bundles, creates a gap for the base resin to enter, allows the fiber bundle to be uniformly dispersed in the base resin, and easily produces a synthetic sleeper with excellent quality. can do.
[00 12 ]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the fiber bundle 1 in this embodiment is manufactured by bundling 5000 to 10,000 reinforcing long fibers 2 having a diameter of about 15 to 20 μm. About 10% (weight ratio) of the binder fiber 3 is impregnated with the reinforcing fiber 2 and then cured by heating and cut into a predetermined length. As the binder resin 3, an unsaturated polyester resin, an epoxy resin, a polystyrene resin, an acrylic resin, a phenol resin, a urea resin, or the like is used. The reinforcing long fibers 2 are good long glass fibers, but may be other aromatic polyamide (aramid) fibers or carbon fibers. The diameter of the fiber bundle 1 is about 2 mm, and the length is 2 to 8 m although it varies depending on the purpose of use.
[00 13 ]
In addition to the above, the fiber bundle 1 of this embodiment is provided with protrusions 4 and 5 that protrude outward in the longitudinal direction of the fiber bundle 1. That is, as shown in FIGS. 2 and 3, the protrusions 4 and 5 are projected at appropriate intervals in the longitudinal direction of the fiber bundle 1. FIG. 2A shows the protrusion 4 formed by pressing the fiber bundle 1 to form a flat portion and then curing, and FIGS. 2B and 2C are cross-sectional views thereof. In order to make the protrusion 4 on the fiber bundle 1, for example, it can be produced by pressing a part of the fiber bundle 1 to make it flat before the fiber bundle 1 is completely cured.
[00 14 ]
FIG. 3 (a) to form a butt raised portion 5 by curing adhering the resin to the outer surface of the fiber bundle 1, (b) is a cross-sectional view thereof. Producing the protrusions 5 on the fiber bundle 1 can be achieved, for example, by attaching a room temperature curable resin to a part of the fiber bundle 1 and curing it. Examples of the room-temperature curable resin used here include unsaturated polyester resins, epoxy resins, acrylic resins, phenol resins, and urea resins.
[00 15 ]
2 and 3, a is a radial outer dimension of a portion having no projection, b is a radial outer dimension of the largest portion of the projection, and c is a length of an interval between the projections. .
[00 16 ]
The interval c between the protrusions on the fiber bundle 1 is typically 100 to 500 mm. The outer dimension b in the radial direction of the protrusions 4 and 5 is 1.2 to 3.0 times, preferably 1.5 to 2.5 times the fiber bundle outer dimension a of the part without the protrusions. Further, the shape may extend over the entire circumference so as to surround the fiber bundle 1 or may be a part of the circumference. Further, in the case of a part of the circumference, the directions thereof may be the same or different. The spacing, size, and shape between the protrusions 4 and 5 listed here are selected from the viewpoint that the intended effect of the present invention is great, and the present invention is not limited to these.
[00 17 ]
FIG. 4A shows a state in which the fiber bundle 1 of this embodiment is stacked in the mold 7, and FIG. 4B shows a state in which the conventional fiber bundle 11 is stacked in the mold 7. Is shown. 4A and 4B show a state in which the same number of fiber bundles 1 and 11 are stacked, but the fiber bundle 1 of this embodiment has protrusions 4 and 5 around the fiber bundle 1. There is a gap from this, and it is bulky.
[00 18 ]
FIG. 5A is a conceptual diagram of a synthetic sleeper 9 manufactured using the fiber bundle 1 of this embodiment, and FIG. 5B is a synthetic sleeper manufactured using the conventional fiber bundle 11. FIG. 19 is a conceptual diagram of 19.
[00 19 ]
The production of the synthetic sleeper is not particularly limited in the present invention, and various methods can be used. That is, a fiber bundle is put into a mold, a base material resin is added thereto, and the base material resin is sufficiently permeated into the fiber bundle and then cured. At this time, conventionally, since the dispersion of the fiber bundle 11 was not good, a method such as mixing the fiber bundle 11 and the base material resin 8 several times during the molding was sometimes used. In the fiber bundle 1 having the form, since there are protrusions 4 and 5 around the fiber bundle 1, a gap is formed between the fiber bundles 1, and the base resin 8 penetrates there, so that the fiber bundle 1 is uniformly dispersed. Becomes easy. Therefore, it is not necessary to separately mix the fiber bundle 1 and the base resin 8, and even if the base resin 8 is added to the fiber bundle 1 at once, sufficiently satisfactory uniformity can be obtained.
[00 20 ]
As shown in FIG. 5 (a), the synthetic sleeper 9 manufactured using the fiber bundle 1 having the protrusions 4 and 5 has a gap between the fiber bundles 1, and the base resin 8 penetrates there. The fiber bundle 1 can be uniformly dispersed. On the other hand, in the conventional synthetic sleeper 19, the fiber bundle 11 is densely stacked as shown in FIG. 5 (b), there is no gap, and the base resin 8 cannot penetrate and the dispersion is uneven. It has become. Thus, if there are few fiber bundles 11 on the surface or inside and there is only a portion of the base material resin 8, the strength of pulling out the dog nail becomes low and the portion cannot be used as a sleeper.
[00 21 ]
In the experiments by the inventors, if the bulk when the fiber bundle is laminated on a predetermined number of molds is 70% or more of the mold depth, a sufficient gap is secured between the fiber bundles to allow the base resin to penetrate. It had been. Thus, in order to make the fiber bundle bulky 70% or more of the mold depth, the size of the protrusions 4 and 5 is 1.2 to 3.0 with respect to the external dimensions of the portion without the protrusions. It was when it doubled out.
[00 22 ]
In this embodiment, the fiber bundle 1 having the protruding portions 4 and 5 projecting outward is used. However, the fiber bundle 11 having no conventional protruding portion is used as long as the effect of this embodiment is not impaired. It is not limited to use a part of the mixture.
[00 23 ]
【Example】
Fiber bundles 1 and 11 were placed in a mold 7, and hard foamed urethane resin was placed as the base material resin 8 from above to produce synthetic sleepers 9 and 19 for testing. The ratio between the fiber bundles 1 and 11 and the hard foamed urethane resin was 50:50 (weight ratio). The synthetic sleepers 9 and 19 were subjected to a dog nail pull-out test. The results are shown in Table 1. In addition, the test bodies 1-3 of an Example attached | subjected the projection part 4 (The space | interval: 250 mm, the largest external dimension in a projection part is 2.0 times the external dimension of a place without a projection part) to the fiber bundle 1, The test bodies 4 to 5 are obtained by attaching the protrusions 5 (interval: 250 mm, the external dimensions of the protrusions are 2.2 times the external dimensions without the protrusions) to the fiber bundle 1.
[00 24 ]
In the dog nail pull-out test, a pilot hole [140 × 200 × 700 mm] is drilled with a pilot hole 15 mm in diameter and 110 mm deep, and a dog nail [JIS E 1108, L = 130 mm] is driven to 20 mm under the neck with a spiking hammer. Subsequently, a pull-out test was performed in accordance with JIS Z 2101 to measure the pull-out strength.
[00 25 ]
[Table 1]
Figure 0004820968
[00 26 ]
As for the pull-out strength of the synthetic sleeper, 15 kN is a standard for passing. In the synthetic sleeper 19 manufactured using the conventional fiber bundle 11, although the specification of 15 kN or more was satisfied, the value was low and there were many variations. However, by using the fiber bundle 1 of the present invention, the dog sleeper was pulled out. The strength stability was greatly improved.
[00 27 ]
【The invention's effect】
According to the present invention, the overlapping of the fiber bundles is relaxed, a gap into which the base material resin enters can be created, the fiber bundle can be uniformly dispersed in the base material resin, and the quality of the manufactured synthetic sleeper is further improved. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a fiber bundle.
2A is a perspective view of a fiber bundle in which a protrusion is formed, FIG. 2B is a sectional view taken along line XX of FIG. 2A, and FIG. 2C is a sectional view taken along line YY.
3A is a perspective view of a fiber bundle in which another protrusion is formed, and FIG. 3B is a cross-sectional view taken along the line ZZ of FIG. 3A.
4A is a cross-sectional view of a state in which fiber bundles having protrusions are stacked, and FIG. 4B is a cross-sectional view of a state in which fiber bundles without protrusions are stacked.
FIG. 5A is a perspective view of a synthetic sleeper manufactured using a fiber bundle having protrusions, and FIG. 5B is a perspective view of a synthetic sleeper manufactured using a conventional fiber bundle.
[Explanation of symbols]
1: Fiber bundle 2: Reinforced long fiber 3: Binder resin 4: Protruding part 5: Protruding part 7: Mold 8: Base material resin 9: Synthetic sleeper 11: Conventional fiber bundle 19: Conventional synthetic sleeper

Claims (2)

直径が１５〜２０μｍの強化長繊維が５０００〜１００００本束ねられバインダ樹脂に含浸、硬化された繊維束の複数本を母材樹脂に分散、硬化させた合成まくらぎであって、
前記繊維束には、長手方向に繊維束径方向の外形寸法に対し５０倍〜２５０倍となる所定の間隔をおいて、繊維束の前記外形寸法に対して１．２〜３．０倍となる所定の最大外形寸法で外側に突出する突起部が前記繊維束が完全硬化する前に繊維束を押圧して扁平部分を形成させた後硬化することによって設けられており、
前記突起部が設けられた繊維束が金型中に金型深さの７０％以上の嵩高さで積み重ねられた状態で、前記金型中に母材樹脂が一度に加えられ、前記母材樹脂が繊維束間の隙間に浸透してから硬化され、繊維束が均一に分散していることを特徴とする合成まくらぎ。 A synthetic sleeper in which 5000 to 10,000 reinforcing long fibers having a diameter of 15 to 20 μm are bundled , impregnated in a binder resin, and a plurality of cured fiber bundles are dispersed and cured in a base resin,
The fiber bundle is 1.2 to 3.0 times the outer dimension of the fiber bundle at a predetermined interval that is 50 to 250 times the outer dimension in the fiber bundle radial direction in the longitudinal direction. projections projecting outward at a predetermined maximum external dimensions made has provided et been by curing after presses the fiber bundle to form a flat portion before the fiber bundle is completely cured,
In a state where the fiber bundles provided with the protrusions are stacked in a mold with a bulk height of 70% or more of the mold depth, a matrix resin is added to the mold at a time, and the matrix resin Synthetic sleepers , wherein the fiber bundles are uniformly dispersed by being cured after penetrating into the gaps between the fiber bundles . 直径が１５〜２０μｍの強化長繊維を５０００〜１００００本束ねてバインダ樹脂に含浸、硬化した繊維束の複数本を母材樹脂に分散、硬化させる合成まくらぎの製造方法であって、
前記繊維束には、長手方向に繊維束径方向の外形寸法に対し５０倍〜２５０倍となる所定の間隔をおいて、繊維束の前記外形寸法に対して１．２〜３．０倍となる所定の最大外形寸法で外側に突出する突起部を前記繊維束が完全硬化する前に繊維束を押圧して扁平部分を形成させた後硬化することによって設けておき、
前記突起部を設けた繊維束を金型中に金型深さの７０％以上の嵩高さで積み重ねた状態で、前記金型中に母材樹脂を一度に加え、前記母材樹脂が繊維束間の隙間に浸透してから硬化させることを特徴とする合成まくらぎの製造方法。 Impregnating a reinforcing long fibers of 15~20μm diameter 5000-10000 present bundled binder resin, a plurality of cured fiber bundles dispersed in the matrix resin, a method for producing a synthetic sleepers cured,
The fiber bundle is 1.2 to 3.0 times the outer dimension of the fiber bundle at a predetermined interval that is 50 to 250 times the outer dimension in the fiber bundle radial direction in the longitudinal direction. A protrusion projecting outward with a predetermined maximum outer dimension is provided by pressing the fiber bundle to form a flat portion before the fiber bundle is completely cured, and then curing it,
In a state where the fiber bundles provided with the protrusions are stacked in a mold with a bulkiness of 70% or more of the mold depth, a base resin is added to the mold at once, and the base resin is a fiber bundle. method for producing a synthetic sleepers, characterized in Rukoto cured after penetration into the gap between.
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