508346 五、 發明說明（1 ) [ 發明所屬技術領域】 本發明係有關用以補強混凝土之混凝土補 強 纖 維，進 一 步而言，係爲已混合前述凝土補強纖維之預 拌 混 凝土， 藉 由 前述纖維所補強的混凝土製品以及混凝土 構 築 物，以 及 有 關纖維補強混凝土構築物的施工方法。 [ 習知技術】 在習知的混凝土補強纖維方面，乃係以不 易 產 生裂縫 者 爲 其重點，與一般的混凝土相較之下，乃是 以 提 昇拉伸 強 度 及拉伸彈性率爲其目標。此外，亦重新審 核 用 以替代 鋼 纖 維之碳纖維或玻璃纖維，及以代替石綿的 維 尼 龍。另 外 在最近於審核混凝土之技術性方面的進展 結 果 ，形成 相 較 於防止裂縫的發生之外，更加重視防止裂 縫 的 擴大， 在 混 凝土補強纖維這方面，形成了更加要求拉伸 強 度以及 拉 伸度的提昇。 本發明係爲提供一種即便顯示有裂縫的情 況 9 亦可防止 其持續擴大的混凝土補強纖維，藉由前述纖 維 所 補強的 混 凝 土製品以及混凝土構築物，且以提供其施 工 方 法爲主 要 課 題，係爲已經硏究之結果及所完成之物。 [ 解決問題之手段】 本發明之目的係有關，爲解決上述問題點 ， 而形成具 有 單 絲纖維度爲300〜15000dtex、纖維拉伸度至少爲10% 、 纖 維斷面之扁平率爲5/4〜10/1之異形斷 面的 聚醯胺 單 絲 纖維所形成之混凝土補強纖維。建議無機 -3- 纖 維 之平均粒 508346 五、發明說明（2 ) 子徑爲0.1〜l〇//m，且最佳爲0.3〜0.5 em，相對於該無機 纖維，其纖維重量建議添加爲0.1〜20重量部，且最佳爲 添加1〜10重量部。在此種混凝土補強纖維中，所適用的 平均纖維長度爲10〜60mm者，而纖維強度至少係爲3.5cN / dtex 者。 將此種混凝土補強纖維加以混合，最佳爲已混合有0.5 〜2vol%之補強纖維混合預拌混凝土、纖維補強混凝土製 品、纖維補強混凝土構築物等，皆係爲出色的混凝土素 材，亦可作爲混凝土成形物加以利用。 此外，本發明之另一目的係爲提供纖維補強混凝土構築 物的施工方法，將於作爲混凝土基料之主原料的水泥、 砂、砂礫及水混合揉捏前述的混凝土補強纖維，利用混凝 土輸送泵將含有補強纖維的混凝土噴塗、抑或澆灌於所定 的位置。 又，本發明之又一目的係爲提供纖維補強混凝土構築物 的施工方法，將於作爲混凝土基料之主原料的水泥、砂、 砂礫及水，使用攪拌車搬運於施工現場，且於一邊攪拌一 邊混合揉捏前述的混凝土補強纖維，利用混凝土輸送泵將 含有補強纖維的混凝土噴塗、抑或澆灌於所定的位置。 【本發明較佳實施例之詳細說明】 以下係爲針對本發明進行更詳細之說明。另外，於本發 明中’纖維強度係以JIS L1070中所記載之方法爲依據而所 測定之値。 508346 五、發明說明（3) 在本發明之混凝土補強纖維中，係爲使用聚醯胺纖維。 在其中，建議亦可使用尼龍纖維。此種尼龍纖維中所含有 的尼龍，亦可使用尼龍6、尼龍66、高收縮性聚合尼龍、 柔軟性聚合尼龍、低融點尼龍等。 所使用補強纖維的單絲纖維度，建議爲 300〜 15000dtex，最佳係爲2000〜8000dtex。未達到300dtex則會 因爲過細而使得於混凝土中產生分散不均、易產生纖維球 (fiber ball)進而造成施工性或補強強度之問題，另一方 面，超過15000dtex時，會減少與混凝土之間的接著面積， 造成補強纖維易受到拉拔而使得補強效果惡化。 在本發明之混凝土補強纖維中，係爲使用扁平同時於表 面具有凹凸之異形斷面纖維。扁平率，意即在相對於纖維 方向之垂直斷面（橫斷面）中的寬（W)與厚（T)的比値 (W/T)，建議範圍爲5/4〜10/ 1，最佳係爲4/3〜5 /2。大於10/1時，相對於混凝土的接著力便會增大而使 得補強纖維的強度減低造成補強效果的下降，此外，亦會 產生於混凝土中的分散性趨於惡化情況。即便是增大厚度 的比率而使扁平率達到5/4時，其補強效果亦會減低。 在本發明之混凝土補強纖維中，係爲添加有如氧化矽、 鈦、滑石、珪、鈷等無機纖維，用以使能更加提昇纖維剛 性。無機纖維的平均粒徑爲0.1〜ΙΟ/zm，最佳係爲0.3〜 0.5em，相對於纖維重量之範圍爲0.1〜20重量部，最佳 係爲1〜10重量部之範圍。倘若添加20重量部以上時，會 508346 五、發明說明（4 ) 減低纖維的拉伸度而造成補強效果的減低。低於0.1重量 部則會無法獲得提昇纖維剛性的效果。 纖維表面的凹凸，最佳係爲於纖維軸向斷面（縱斷面） 所呈現之凹凸或突起，該高低差係適於0.1〜〇.5mm。小於 0.1mm時，則會降低補強效果，大於0.5mm時，則會增加 相對於混凝土的接著力，而減低補強纖維的強度進而減低 補強效果。 將補強纖維扁平化、在表面形成凹凸之異形斷面纖維加 工之中，於斷面形狀爲圓形的纖維進行滾軋加工的實施方 法，係適用於朝纖維軸向所進行的連續加工。 經由前述異形斷面加工之混凝土補強纖維，係爲使用拉 伸度至少爲10%，建議爲20%以上，纖維強度至少爲 3.5cN/dtex，建議爲 5cN/dtex 以上，最佳係爲 7cN/dtex 以上者。拉伸度未達到10%的補強纖維，因具有無法充分 達到作爲混凝土構造物等的延展性、韌性，故無法充分達 到防止裂縫擴大的效果。此外，拉伸強度未達到3.5 cN/ dtex時，作爲混凝土補強纖維之強度便顯不足。平均纖維 長度建議爲10〜60mm，最佳係爲20〜5 0mm。未達到1 0mm 時，則易產生自混凝土的拉拔，超過60mm時，則會有分 散性惡化的情況產生。藉由於兩面異形斷面的加工而減低 纖維剛性，且提昇與混凝土、灰泥等的接著性。 進一步而言，本發明之混凝土補強纖維，亦可使用混合 2種以上之纖維度相異的纖維。意即，可以使用纖維度在 508346 五、發明說明（5) 300〜15000dtex之間，且以纖維度相異之2種種類以上的 纖維混合使用。藉由使用纖維度相異之本發明的補強纖 維，具有使在混凝土中的分散性爲佳之利點。進行混合之 補強纖維的纖維度方面，纖維度比最佳係爲1.5〜3倍的範 圍。 又，本發明之混凝土補強纖維，亦可使用混合2種、抑 或是3種以上之長度相異的纖維。意即，可以使用平均纖 維長度最佳爲在10〜60mm的範圍、且混合長度相異之2 種種類以上的本發明混凝土補強纖維，抑或是，可使用纖 維長度係分布在10〜60mm之範圍內者。藉由使用長度相 異之本發明補強纖維，而可改善在混凝土中的分散性。進 行混合的補強纖維之長度比率最佳係爲在1.5〜3倍的範 圍。 前述本發明之混凝土補強纖維，一般相對於已混合有水 泥、砂、砂礫及水之混凝土基料，係爲添加0.5〜2vol%之 程度。未達0.5 vol%，則不易獲得充分的補強效果，超過 2 vol%時，則會造成混凝土中的分散性惡化。本發明之混 凝土補強纖維，係於作爲預伴混凝土的混凝土基料中混合 0.5〜2vol%之補強纖維，可便利的利用於噴塗、澆灌等之 用。 本發明之混凝土補強纖維，因其素材含有聚醯胺，故具 有耐鹼性，且可維持在混凝中的半永久性之特性，混合於 各種混凝土製品中時，可達到提昇製品強度以及輕量化之 508346 五、 發 明 說明（6 ) 巨 標 〇 此 種效果會藉由使用尼丨 龍6等的尼龍，而使功效 更 爲 提 昇 〇 可利用的混凝土製品 ，囊括各種的建築板材、 導 管 枕木 、電柱等多樣製品。 本發明補強纖維的混 合量 係依 據 使 用目的的不同，而需 要另行試驗加以硏討 ，在 -- 般 的 混 凝 土製品中，加入0.5〜 2vol%之程度即可。 本發明之混凝土補強纖維， 即便是相對於用以道 路或 滑 行 用 通 路 之舖裝用、隧道、建 築用地面厚板、永久 鑲板 、 斜 面 的 保 護壁等的混凝土構築 物而言，亦可與混凝 土製 品 相 同 且 可有效的利用。用以防 止裂縫的擴大者，係 可有效 的 防 止 如 隧道內壁的剝落等。 混合量方面，係與前 述混 凝 土 製 品 相 同，會隨使用目的的 不同，而需要另行試 驗加以 硏討 y —* 般而言，加入0.5〜2vol%之程度即可。 利用前述之本發明的混凝土補強纖維以進行施工 之際 除 可 將 補 強纖維作爲粗原料而 混合至任意的階段之 中， 亦 可 如 一 般 情況下，將於作爲混 凝土基料之主原料的 水泥 砂 砂 礫 及水混合揉捏混凝土 補強纖維，利用混凝 土輸 送 泵 等 將 含 有補強纖維的混凝土噴塗抑或澆灌於所 定的 位 置 〇 亦 可 將於作爲混凝土基料 之主原料的水泥、砂 、砂 礫 及水 ， 使 用攪拌車搬運於施工 現場，且於一邊攪拌 一邊 混 合 揉 捏 混 凝土補強纖維，利用 混凝土輸送泵將含有 補強 纖 維 的 混 凝 土噴塗抑或澆灌於所 定的位置。此外，本 發明 之 補 強 纖 維 除可適於應用上述的 混凝土外，亦可適用 於灰 泥 或 水 泥 灰 漿。 -8 - 508346 五、發明說明（7) (實施例） 所揭露之實施例係爲用以說明本發明之效果。相對於纖 維補強劑之混凝土，其附著力的評價標準係以】CI— SF8爲 依據，用以進行最大拉拔荷重與柔韌度（韌性）之測定。 柔韌度係藉由計算測量纖維自拉拔到切斷爲止之應力-歪 斜的面積。彎曲特性的評價標準係以JISR5201爲依據，用 以進行最大彎曲強度與柔韌度（韌性）之測定。柔韌度係 藉由計算自彎曲開始到5mm變形爲止的應力一歪斜的面 積。 (實施例1 ) 於纖維度6600dtex的尼龍6單絲纖維，使用壓花滾筒 (絞擰模式：斜格子狀）以實施異形斷面加工，且利用纖 維束切割器於長度30mm處切斷。所得到的混凝土補強纖 維的斷面形狀係爲，寬度：1.68mm、厚度：0.54mm、扁平 率：3.1、拉伸強度·· 5_8cN/dtex、拉伸度：38.5%、表面 凹凸差：0.24mm。相對於此種混凝土補強纖維之混凝土， 其附著力藉由前述方法之評價結果如表1所示。 (比較例1 ) 同實施例1，然扁平率係以作爲1.2進行加工，將拉伸 度爲32.0%之尼龍6的混凝土補強纖維與實施例1進行相 同的評價，其評價結果如表1所示。 (比較例2，3 ) 以2種種類的合成纖維作爲混凝土之補強纖維，與實施 508346 五、發明說明（8) 例1進行相同的評價，其評價結果如表1所示。 (實施例2 ) 已添加1重量％氧化矽之纖維度6600dtex的尼龍6單 絲纖維以實施例2的方法進行異形斷面化，切斷所得的混 凝土補強纖維之斷面形狀係爲，寬度：1.37mm、厚度： 0.95mm、扁平率：1.4、拉伸強度：5.8cN/dtex、拉伸度： 50%。將此種混凝土補強纖維添加1.0體積％於混凝土 內，混凝土的彎曲特性則藉由前述方法進行評價，其結果 如表1所示。 (實施例3 ) 已添加3重量％氧化矽之纖維度6600dtex的尼龍6單 絲纖維以實施例2的方法進行異形斷面化，切斷所得的混 凝土補強纖維之斷面形狀係爲，寬度：1.37mm、厚度： 0.95mm、扁平率：1.4、拉伸強度：5.9cN/dtex、拉伸度： 44%。此種混凝土補強纖維則藉由實施例2的方法進行評 價，其結果如表1所示。 (實施例4 ) 已添加5重量％氧化矽之纖維度6600 dtex的尼龍6單 絲纖維以實施例2的方法進行異形斷面化，切斷所得的混 凝土補強纖維之斷面形狀係爲，寬度：L37mm、厚度： 0.95mm、扁平率：丨.4、拉伸強度：5·8 cN/ dtex、拉伸 度.32%。此種混凝土補強纖維則藉由實施例2的方法進 行評價，其結果如表1所示。 -10- 508346 五、發明說明（9 ) (實施例5 ) 已添加3重量％氧化矽之纖維度9000 dtex的尼龍6單 絲纖維以實施例2的方法進行異形斷面化’切斷所得的混 凝土補強纖維之斷面形狀係爲，寬度：1.68mm、厚度= 1.00mm、扁平率：1.7、拉伸強度·· 6.0、拉伸度：34%。此 種混凝土補強纖維則藉由實施例2的方法進行評價’其結 果如表1所示。 (比較例4 ) 纖維度6600dtex的尼龍6單絲纖維以實施例2的方法 進行異形斷面化，切斷所得的混凝土補強纖維之斷面形狀 係爲，寬度：寬度：1.37mm、厚度：0.95mm、扁平率： 1.4、拉伸強度：5.7 cN/dtex、拉伸度· 50%。此種混凝土 補強纖維則藉由實施例2的方法進行評價，其結果如表1 所示。 (比較例5 ) 於比較例3所用的混凝土補強用合成纖維以實施例2的 方法評價，其結果如表1所示。 【於產業上利用之可能性】 本發明之混凝土補強纖維，係爲較習知所使用的鋼纖維 的重量較輕、且在處理上也較爲容易，於施工時，不易因 突出的補強纖維而產生刺傷等事故，同時，亦不會產生生 鏽而損害表面的美觀。此外，本發明之補強纖維係爲具有 親水性的尼龍，相較於以烯系纖維作爲素材之補強纖維， -11- 508346 五、發明說明（1 o) 與混凝土的接著性、以及混凝土泥漿中的分散性良好，同 時，因拉伸強度爲高之故，具有接著性良好且相輔地具有 較佳的混凝土物性之特長。即便與維尼龍係補強纖維相互 比較，亦具有更大的拉伸度、且藉由適度的接著性便可給 予混凝土延性或是柔韌度之特長。 圖式簡單說明 第1圖所示係揭露於實施例中之相對於纖維補強劑之混 凝土的附著特性曲線圖。 第2圖所示係揭露於實施例中之相對於纖維補強劑之混 凝土的彎曲特性之應力一歪斜曲線圖。 -12- 508346 五、發明說明（11) 比較例 6400 寸 15.6 m (N 〇 ON CO 1.13 寸 尼龍6 6600 〇 0.24X2 00 〇 m 1 6400 寸 15.6 m (N 534 0.76 (N 維尼， 4000 卜 414 0.32 1 i 尼龍6 6600 〇 〇〇 ίη (N m (N 0.10 386 j 0.58 〇 實施例 9000 氧化砂 ο 卜 0.24X2 1--- ON in 1.33 寸 6600 οο ΙΤ) (N m 寸· O MD 1.18 m m σ\ yn 5 m H r—H (N 1—1 οο 寸· — ο οο 38.5 0.24 592 〇 ™_ 纖維度 dtex 種類 ！ 含有量％ 平均纖維長度mm 強度 cN/dtex 拉伸度 ％ 扁平率 W/T 表面凹凸差 最大拉伸荷重N 柔韋刃度比 纖維含有量 最大彎曲應力N 柔韌度比 微細 金屬 纖維 附著特性 (試塊型） 灰泥特性 -13-508346 V. Description of the invention (1) [Technical field of the invention] The present invention relates to concrete reinforcing fibers used to reinforce concrete, and more specifically, it is a ready-mixed concrete that has been mixed with the above-mentioned concrete reinforcing fibers, and the above-mentioned fibers Reinforced concrete products and concrete structures, and construction methods related to fiber-reinforced concrete structures. [Known technology] In terms of conventional concrete reinforcing fibers, the focus is on those that are not prone to cracks. Compared with ordinary concrete, the goal is to increase tensile strength and tensile elasticity. In addition, the nuclear and carbon fiber or glass fiber used to replace steel fiber, and Vinylon used to replace asbestos were also reviewed. In addition, as a result of recent progress in reviewing the technical aspects of concrete, it is more important to prevent the expansion of cracks than to prevent the occurrence of cracks. In terms of concrete reinforcing fibers, it has become more demanding for tensile strength and elongation. Promotion. The present invention is to provide a concrete reinforcing fiber that can prevent its continuous expansion even if it shows the condition 9 of cracks. The concrete products and concrete structures reinforced by the aforementioned fibers are provided, and the main task is to provide a construction method thereof. The results of research and what was done. [Means for Solving the Problem] The purpose of the present invention is to solve the above-mentioned problems by forming a monofilament fiber having a fiber density of 300 to 15000 dtex, a fiber elongation of at least 10%, and a flatness ratio of the fiber cross section of 5/4. ~ 10/1 Concrete reinforced fiber formed by polyamide monofilament fiber with a special section. It is recommended that the average particle size of the inorganic-3-fibers is 508346. 5. Description of the invention (2) The diameter of the inorganic fibers is 0.1 ~ 10 // m, and the best is 0.3 ~ 0.5 em. Relative to the inorganic fibers, the recommended fiber weight is 0.1. ~ 20 parts by weight, and preferably 1 ~ 10 parts by weight. Among such concrete reinforced fibers, those with an average fiber length of 10 to 60 mm are applicable, and those with a fiber strength of at least 3.5 cN / dtex. Mixing this kind of concrete reinforcing fiber, it is best to mix 0.5 ~ 2vol% reinforced fiber mixed ready-mixed concrete, fiber reinforced concrete product, fiber reinforced concrete structure, etc., all are excellent concrete materials, and can also be used as concrete Use the formed article. In addition, another object of the present invention is to provide a construction method for fiber-reinforced concrete structures. The above-mentioned concrete reinforcement fibers are kneaded by mixing cement, sand, gravel, and water as the main raw material of the concrete base material, and using a concrete conveying pump to The concrete containing reinforcing fibers is sprayed or poured at a predetermined location. Furthermore, another object of the present invention is to provide a construction method for fiber-reinforced concrete structures. Cement, sand, gravel, and water, which are the main raw materials of the concrete base material, will be transported to the construction site using a mixer truck, while stirring. The aforementioned concrete reinforcing fibers are kneaded and kneaded, and the concrete containing the reinforcing fibers is sprayed or poured at a predetermined position by a concrete conveying pump. [Detailed description of the preferred embodiment of the present invention] The following is a more detailed description of the present invention. In the present invention, the 'fiber strength' is measured based on the method described in JIS L1070. 508346 V. Description of the invention (3) In the reinforced concrete fiber of the present invention, polyamide fiber is used. Among them, nylon fibers are also recommended. As nylons contained in such nylon fibers, nylon 6, nylon 66, high-shrinkage polymer nylon, flexible polymer nylon, and low-melting-point nylon can also be used. The monofilament fiber density of the reinforcing fiber used is recommended to be 300 to 15000 dtex, and the optimal system is 2000 to 8000 dtex. If it is less than 300 dtex, it will cause uneven dispersion in the concrete due to being too thin, and fiber balls will easily be generated, which will cause problems in workability or reinforcing strength. On the other hand, if it exceeds 15,000 dtex, it will reduce the Following the area, the reinforcing fibers are susceptible to drawing and the reinforcing effect is deteriorated. In the concrete reinforcing fiber of the present invention, a fiber with a special cross section that is flat and has unevenness on the surface is used. Flatness ratio, which means the ratio of width (W) to thickness (T) in a vertical section (cross section) relative to the fiber direction 値 (W / T), the recommended range is 5/4 ~ 10/1, The best system is 4/3 ~ 5/2. When it is greater than 10/1, the adhesion force to the concrete will increase and the strength of the reinforcing fibers will decrease, resulting in a decrease in the reinforcing effect. In addition, the dispersion in the concrete will also deteriorate. Even if the thickness ratio is increased to achieve a flattening ratio of 5/4, the reinforcing effect is reduced. In the concrete reinforcing fiber of the present invention, inorganic fibers such as silicon oxide, titanium, talc, samarium, cobalt, etc. are added to enable the fiber stiffness to be further enhanced. The average particle diameter of the inorganic fiber is 0.1 to 10 / zm, the optimum system is 0.3 to 0.5em, and the range of the fiber weight is 0.1 to 20 parts by weight, and the optimum system is in the range of 1 to 10 parts by weight. If it is added more than 20 parts by weight, it will be 508346. V. Description of the invention (4) Decreasing the fiber elongation and reducing the reinforcing effect. Below 0.1 part by weight, the effect of improving the rigidity of the fiber cannot be obtained. The unevenness on the fiber surface is preferably the unevenness or protrusions present on the axial section (longitudinal section) of the fiber, and the height difference is suitable for 0.1 to 0.5 mm. If it is less than 0.1mm, it will reduce the reinforcement effect, and when it is more than 0.5mm, it will increase the adhesion force to the concrete, and reduce the strength of the reinforcing fiber and then the reinforcement effect. The method of flattening reinforcing fibers to form irregularities on the surface to form irregularities on the surface, and rolling the fibers with a circular shape in the cross section is suitable for continuous processing in the fiber axial direction. The reinforced concrete fibers processed through the aforementioned special-shaped cross-sections are used with a tensile strength of at least 10%, a recommendation of 20% or more, a fiber strength of at least 3.5cN / dtex, and a recommendation of 5cN / dtex or more. Above dtex. Reinforced fibers with a stretch of less than 10% cannot sufficiently achieve the ductility and toughness of concrete structures and the like, so they cannot sufficiently prevent the effects of cracks from expanding. In addition, when the tensile strength does not reach 3.5 cN / dtex, the strength as a concrete reinforcing fiber is insufficient. The average fiber length is recommended to be 10 to 60 mm, and the optimal system is 20 to 50 mm. If it is less than 10 mm, it is easy to cause the drawing of concrete. If it is more than 60 mm, the dispersion may be deteriorated. By processing the two-sided profiled section, the fiber rigidity is reduced, and the adhesion to concrete, plaster, etc. is improved. Furthermore, as the concrete reinforcing fiber of the present invention, two or more fibers having different fiber densities may be used. In other words, you can use two or more kinds of fibers with a fiber degree between 508346 and 5. Description of the Invention (5) 300 ~ 15000 dtex. By using the reinforcing fibers of the present invention having different fiber densities, it has the advantage of making the dispersibility in concrete better. In terms of the fiber content of the reinforced fibers to be mixed, the fiber ratio is optimally in the range of 1.5 to 3 times. The concrete reinforcing fiber of the present invention may be a mixture of two or more fibers having different lengths. In other words, two or more types of concrete reinforcing fibers of the present invention having an average fiber length in the range of 10 to 60 mm and having different mixed lengths can be used, or the fiber length can be used in the range of 10 to 60 mm. Insider. By using reinforcing fibers of the present invention having different lengths, the dispersibility in concrete can be improved. The length ratio of the reinforcing fibers to be mixed is preferably in the range of 1.5 to 3 times. The aforementioned concrete reinforcing fiber of the present invention is generally added to a level of 0.5 to 2 vol% relative to a concrete base material in which cement, sand, gravel, and water have been mixed. If it is less than 0.5 vol%, it is difficult to obtain a sufficient reinforcing effect, and if it exceeds 2 vol%, the dispersibility in concrete deteriorates. The reinforced concrete fiber of the present invention is a 0.5 to 2 vol% reinforced fiber mixed in a concrete base material as pre-accompanied concrete, and can be conveniently used for spraying, pouring and the like. The reinforced concrete fiber of the present invention has alkali resistance and can maintain the semi-permanent characteristics in the coagulation because its material contains polyamidine. When mixed in various concrete products, it can improve the strength and lightness of the product. No. 508346 V. Description of the invention (6) Huge standard 〇 This effect will be improved by using nylon 6 and other nylons. Available concrete products, including various building boards, conduit sleepers, electric poles And other diverse products. The mixing amount of the reinforcing fibers of the present invention depends on the purpose of use, and needs to be tested separately for discussion. It is only necessary to add about 0.5 to 2 vol% to the ordinary concrete product. The reinforced concrete fiber of the present invention is also compatible with concrete, even for concrete structures such as paving, tunnels, building floor slabs, permanent panels, sloped protective walls, etc. for roads or taxiways. The products are the same and can be effectively used. To prevent the cracks from expanding, they can effectively prevent the peeling of the inner wall of the tunnel. In terms of mixing amount, it is the same as the concrete product mentioned above, and it will need to be tested separately depending on the purpose of use. Y — * Generally speaking, it is only necessary to add 0.5 ~ 2vol%. When using the aforementioned reinforced concrete fiber of the present invention for construction, the reinforced fiber can be used as a raw material and mixed into any stage, or, as usual, the cement sand which is the main raw material of the concrete base material will be used. Grit and water are mixed to knead the reinforcing fibers of the concrete, and the concrete containing the reinforcing fibers is sprayed or poured at a predetermined position by using a concrete pump. It can also be used as the main raw material of the concrete base, such as cement, sand, gravel and water. The mixer truck is carried at the construction site, and the concrete reinforcing fibers are mixed and kneaded while stirring, and the concrete containing the reinforcing fibers is sprayed or poured at a predetermined position by using a concrete conveying pump. In addition, the reinforcing fiber of the present invention can be used in addition to the above-mentioned concrete, and can also be applied to plaster or cement mortar. -8-508346 V. Description of the Invention (7) (Examples) The disclosed examples are used to illustrate the effects of the present invention. Compared with fiber reinforced concrete, the evaluation standard of adhesion is based on [CI-SF8], which is used to determine the maximum drawing load and flexibility (toughness). Flexibility is calculated by measuring the stress-skewed area of the fiber from drawing to cutting. The evaluation standard of bending characteristics is based on JISR5201, and is used to measure the maximum bending strength and flexibility (toughness). Flexibility is calculated by calculating the stress-skewed area from the start of bending to 5mm deformation. (Example 1) A nylon 6 monofilament fiber having a fiber density of 6600 dtex was subjected to a profiled cross section using an embossing roller (twisting mode: diagonal grid), and cut at a length of 30 mm by a fiber bundle cutter. The cross-sectional shape of the obtained concrete reinforcing fiber was: width: 1.68 mm, thickness: 0.54 mm, flattening ratio: 3.1, tensile strength · 5_8 cN / dtex, elongation: 38.5%, surface unevenness: 0.24 mm . Compared to this kind of concrete reinforced fiber concrete, the evaluation results of the adhesion by the aforementioned method are shown in Table 1. (Comparative Example 1) Same as Example 1, except that the flatness ratio was processed as 1.2, and the concrete reinforced fiber of nylon 6 with a stretch of 32.0% was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. Show. (Comparative Examples 2, 3) Two types of synthetic fibers were used as the reinforcing fibers of concrete. The same evaluation was performed as described in Example 508346 V. Invention (8) Example 1. The evaluation results are shown in Table 1. (Example 2) A nylon 6 monofilament fiber having a fiber density of 6600 dtex with 1% by weight of silica added was profiled by the method of Example 2. The section shape of the concrete reinforced fiber obtained by cutting was: width: 1.37mm, thickness: 0.95mm, flatness ratio: 1.4, tensile strength: 5.8cN / dtex, elongation: 50%. When 1.0% by volume of this concrete reinforcing fiber was added to the concrete, the bending characteristics of the concrete were evaluated by the aforementioned method. The results are shown in Table 1. (Example 3) A nylon 6 monofilament fiber having a fiber density of 6600 dtex with 3% by weight of silica added was profiled by the method of Example 2. The section shape of the concrete reinforced fiber obtained by cutting was: width: 1.37mm, thickness: 0.95mm, flatness ratio: 1.4, tensile strength: 5.9cN / dtex, elongation: 44%. This concrete reinforcing fiber was evaluated by the method of Example 2. The results are shown in Table 1. (Example 4) A nylon 6 monofilament fiber having a fiber density of 6600 dtex with 5% by weight silica added was profiled by the method of Example 2. The shape of the section of the concrete reinforced fiber obtained by cutting was: width : L37mm, thickness: 0.95mm, flattening ratio: 丨 .4, tensile strength: 5.8 cN / dtex, elongation: 32%. This concrete reinforcing fiber was evaluated by the method of Example 2. The results are shown in Table 1. -10- 508346 V. Description of the invention (9) (Example 5) Nylon 6 monofilament fiber with a fiber density of 9000 dtex to which 3% by weight of silicon oxide has been added is cut by the method of Example 2 The cross-sectional shape of the reinforced concrete fiber is: width: 1.68 mm, thickness = 1.00 mm, flattening ratio: 1.7, tensile strength · 6.0, elongation: 34%. This concrete reinforcing fiber was evaluated by the method of Example 2 '. The results are shown in Table 1. (Comparative Example 4) A nylon 6 monofilament fiber having a fiber degree of 6600 dtex was profiled by the method of Example 2. The cross-sectional shape of the concrete reinforced fiber obtained by cutting was: width: width: 1.37 mm, thickness: 0.95 mm, flattening ratio: 1.4, tensile strength: 5.7 cN / dtex, elongation · 50%. This concrete reinforcing fiber was evaluated by the method of Example 2. The results are shown in Table 1. (Comparative Example 5) The synthetic fiber for concrete reinforcement used in Comparative Example 3 was evaluated by the method of Example 2. The results are shown in Table 1. [Possibility of industrial use] The reinforced concrete fiber of the present invention is lighter than conventionally used steel fiber, and it is easier to handle. It is not easy to be protruded by the reinforcing fiber during construction. Accidents such as stab wounds will occur, and at the same time, rust will not be generated to damage the appearance of the surface. In addition, the reinforcing fiber of the present invention is a hydrophilic nylon. Compared with the reinforcing fiber using olefinic fiber as a material, -11-508346 V. Description of the invention (1o) Adhesion to concrete and concrete slurry It has good dispersibility, and at the same time, because of its high tensile strength, it has the characteristics of good adhesion and complementary good physical properties of concrete. Even when compared with Vylon-based reinforcing fibers, they have greater elongation, and can impart concrete ductility or flexibility with moderate adhesion. Brief Description of the Drawings Fig. 1 is a graph showing the adhesion characteristics of concrete with respect to the fiber reinforcing agent disclosed in the examples. Fig. 2 is a stress-deflection curve of the bending characteristics of the concrete with respect to the fiber reinforcement disclosed in the examples. -12- 508346 V. Description of the invention (11) Comparative example 6400 inch 15.6 m (NONON CO 1.13 inch nylon 6 6600 〇0.24X2 00 〇m 1 6400 inch 15.6 m (N 534 0.76 (N Winnie, 4000 414 0.32 1 i Nylon 6 6600 〇〇〇ίη (N m (N 0.10 386 j 0.58) Example 9000 sand oxide ο 0.24X2 1 --- ON in 1.33 inch 6600 οο ΙΤ) (N m inch · O MD 1.18 mm σ \ yn 5 m H r—H (N 1— 1 οο inch · — ο οο 38.5 0.24 592 〇__ Fiber type dtex type! Content% Average fiber length mm Strength cN / dtex Elongation% Flatness W / T Surface unevenness maximum tensile load N Rowell blade ratio fiber content maximum bending stress N flexibility ratio fine metal fiber adhesion characteristics (test block type) plaster characteristics -13-