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CN114131981A - 钢筋棒体的制造方法 - Google Patents

钢筋棒体的制造方法 Download PDF

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CN114131981A
CN114131981A CN202111024894.4A CN202111024894A CN114131981A CN 114131981 A CN114131981 A CN 114131981A CN 202111024894 A CN202111024894 A CN 202111024894A CN 114131981 A CN114131981 A CN 114131981A
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resin
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中川裕茂
中川敬章
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Nakagawa Sangyo Co Ltd
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Abstract

本发明提供能够简易并且廉价地制造具有足够强度的钢筋棒体的钢筋棒体的制造方法。本发明的钢筋棒体的制造方法包括下述工序：在截面中心部配置热塑性树脂纤维(2)，在热塑性树脂纤维(2)的外周配置增强纤维(1)，将热塑性树脂纤维(2)加热至熔融温度以上而使其熔融，然后进行冷却，在截面中心部形成棒状的树脂层(91)，并且在该树脂层(91)的外周形成纤维增强树脂层(92)，从而制造钢筋棒体(9)。

Description

钢筋棒体的制造方法
技术领域
本发明涉及可以适用于增强混凝土等的钢筋棒体的制造方法。
背景技术
作为这种钢筋棒体代替现有的铁制钢筋棒体而使用了不生锈并且能够长时间维持混凝土的强度的玄武岩纤维的钢筋棒体受到瞩目。作为这样的钢筋棒体，例如如专利文献1所示那样，提出了以玄武岩纤维束为芯材并以规定厚度的热塑性树脂层包覆其周围的结构的钢筋棒体。作为在芯材的周围形成树脂层的方法，以往大多利用使芯材在树脂的熔融溶液中通过的浸渍法。另一方面，如专利文献2所示那样，尝试了通过以规定直径的树脂棒体构成芯材并在其周围卷绕增强纤维来确保强度。
现有技术文献
专利文献
专利文献1：日本特开2012-251378
专利文献2：WO2017/043654
发明内容
发明所要解决的问题
然而，浸渍法由于需要设置熔融树脂的蓄积槽等，存在装置整体的规模变大而制造成本变高的问题。另一方面，预先准备树脂棒体作为芯材的方法也存在需要通过挤出成型等来另行制造树脂棒体的劳动和时间等问题。
因此，本发明解决这样的问题，其目的在于：提供能够简易并且廉价地制造具有足够强度的钢筋棒体的钢筋棒体的制造方法。
用于解决问题的手段
为了达成上述目的，在本第一发明的钢筋棒体的制造方法中，具有下述特征：在截面中心部配置热塑性树脂纤维(2)，在上述热塑性树脂纤维(2)的外周配置增强纤维(1)，将上述热塑性树脂纤维(2)加热至熔融温度以上而使其熔融，然后进行冷却，在上述截面中心部形成棒状的树脂层(91)，并且在该树脂层(91)的外周形成纤维增强树脂层(92)。
由本第一发明的制造方法制造的钢筋棒体在截面中心部形成有棒状的树脂层，并且在围绕该树脂层的外周部形成有在树脂中埋设有增强纤维的纤维增强树脂层，能够得到具有棒状树脂层与纤维增强树脂层相互牢固结合的足够强度的钢筋棒体。而且，根据本第一发明的制造方法，由于不需要像利用现有的浸渍法的情况那样地设置熔融树脂的蓄积槽，因此装置构成得以简化；另外，由于也不需要通过挤出成型等来预先准备成为芯材的树脂棒体，因此制造的劳动和时间得以减少，从而能够在整体上大幅降低制造成本。
在本第二发明的钢筋棒体的制造方法中，在上述纤维增强树脂层(92)的外周进一步形成树脂的包覆层(101)。
由本第二发明的制造方法制造的钢筋棒体通过在外周形成包覆层，能够进一步增大其强度，而且耐化学药品性也提高。
在本第三发明的钢筋棒体的制造方法中，使用玄武岩纤维作为上述增强纤维(1)。
由本第三发明的制造方法制造的钢筋棒体由于使用玄武岩纤维作为增强纤维，因此作为设置于混凝土内的钢筋棒体是有效的。
此外，上述括号内的符号参考性地示出与后述的实施方式所记载的具体方法的对应关系。
发明效果
如上所述，根据本发明的钢筋棒体的制造方法，能够简易并且廉价地制造具有足够强度的钢筋棒体。
附图说明
图1是本发明的第一实施方式中的实施钢筋棒体的制造方法的装置的立体示意图。
图2是钢筋棒体的剖面概念图。
图3是本发明的第一实施方式中的实施钢筋棒体的制造方法的装置的侧面示意图。
图4是钢筋棒体的剖面概念图。
符号说明
1玄武岩纤维(增强纤维)、2聚丙烯树脂纤维(热塑性树脂纤维)、5第一模具、6第二模具、7冷却装置、9钢筋棒体、91树脂层、92纤维增强树脂层、10钢筋棒体、101包覆层、20挤出成型模具、40冷却装置。
具体实施方式
此外，以下进行说明的实施方式只是一个例子，在不脱离本发明的主旨的范围内，本领域技术人员所进行的各种设计的改良也包含于本发明的范围中。
(第一实施方式)
图1示出用于实施本发明的钢筋棒体的制造方法的装置构成的一例。在图1中，作为强化纤维的玄武岩纤维1、和作为成为基体树脂的热塑性树脂纤维的聚丙烯(PP)树脂纤维2分别卷绕于线轴3、4。这些线轴3、4由省略图示的架子(rack)支撑。
从各线轴3、4抽出的玄武岩纤维1与PP树脂纤维2从在预备加热用的第一模具5的端面开口的各贯穿孔51、52通过。此时，PP树脂纤维2在第一模具5的端面中心部形成的贯穿孔51中贯通，另一方面，玄武岩纤维1在上述第一模具5的端面外周部形成的贯穿孔52贯通。此外，线轴3、4、贯穿孔51、52的数量、即玄武岩纤维1、PP树脂纤维2的根数(束数)可以根据成型后的钢筋棒体所要求的规格来适当决定。作为一例，玄武岩纤维1的根数为4根，细度为4800TEX，PP树脂纤维的根数为5～6根，细度为15000dTEX。
在第一模具5的贯穿孔51、52中通过的玄武岩纤维1及PP树脂纤维2在加热至PP树脂纤维2的熔融温度以上的第二模具6的端面中心开口的单一的贯穿孔61内聚集贯通。而且，在通过该贯穿孔61通过期间，熔融的PP树脂纤维2在截面中心部相互融合，并且熔融树脂的一部分浸入位于截面外周部的玄武岩纤维1之间而得到原棒体8，原棒体8从第二模具6的贯穿孔61送出。此外，也可以设置多个将贯穿孔61逐渐缩小直径而成的第二模具6，并使原棒体8依次通过这些第二模具6的贯穿孔61依次通过而得到期望截面直径和期望截面形状的原棒体8。
从第二模具6送出的原棒体8在最终的冷却装置7中通过，在冷却装置7内PP树脂固化而成为钢筋棒体9并被输出。将钢筋棒体9的概念性截面示于图2。钢筋棒体9在截面中心部形成有规定直径的棒状的仅由PP树脂形成的树脂层91，并且在围绕该树脂层91的外周部形成有在PP树脂中埋设有玄武岩纤维1的纤维增强树脂层92。作为一例，树脂层91的直径为1.5mm～3.5mm，纤维增强树脂层92的厚度为0.75mm～1.75mm。
就这样的结构的钢筋棒体9而言，截面中心部的棒状树脂层91、和与该树脂层91一体化而成的截面外周部的纤维增强树脂层92相互牢固地结合而具有足够强度(作为一例，拉伸强度为15kN左右)，可以适用于增强混凝土等用途。而且，根据本实施方式的制造方法，不需要像利用现有的浸渍法的情况那样设置熔融树脂的蓄积槽，因此装置构成得以简化；另外，也不需要通过挤出成型等预先准备成为芯材的树脂棒体，因此制造的劳动和时间得以减少而能够在整体上大幅降低制造成本。
(第二实施方式)
可以将由第一实施方式的方法制造的钢筋棒体9供给至如图3所示的挤出成型模具20，在纤维增强树脂层92的外周形成如图4所示的规定厚度的包覆层101。即，在图3中，将由第一实施方式的制造方法得到的钢筋棒体9供给至连接了挤出机30的挤出成型模具20，该挤出机30设置有蓄积成为热塑性树脂的例如PP树脂的粒料的加料斗301，将熔融PP树脂挤出至钢筋棒体9的纤维增强树脂层92的外周，使挤出了的熔融PP树脂在后段的冷却装置40中固化而制成包覆层101。形成了包覆层101的钢筋棒体10通过以足够的厚度形成该包覆层而使其强度进一步增加，并且能够提高耐化学药品性。
(其它的实施方式)
在上述实施方式中，使用了聚丙烯树脂纤维作为热塑性树脂纤维，但不限定于此，也可以使用聚乙烯树脂纤维、尼龙树脂纤维、聚酯树脂纤维等。
另外，作为增强纤维，不限于玄武岩纤维，也可以使用玻璃纤维、碳纤维等其他无机纤维、芳纶纤维、丙烯酸纤维等有机纤维。
包覆层并不必须使用与纤维增强树脂层的树脂相同的树脂，设定为相同树脂更有利于包覆层与纤维增强树脂层的一体化。
可以在将热塑性树脂纤维、增强纤维向模具供给时进行加捻。

Claims (3)

1.一种钢筋棒体的制造方法，其特征在于，其包括下述工序：
在截面中心部配置热塑性树脂纤维，在所述热塑性树脂纤维的外周配置增强纤维，将所述热塑性树脂纤维加热至熔融温度以上而使其熔融，然后进行冷却，在所述截面中心部形成棒状的树脂层，并且在该树脂层的外周形成纤维增强树脂层。
2.根据权利要求1所述的钢筋棒体的制造方法，其中，在所述纤维增强树脂层的外周进一步形成树脂的包覆层。
3.根据权利要求1或2所述的钢筋棒体的制造方法，其使用了玄武岩纤维作为所述增强纤维。
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