JP6174531B2 - Method for producing steel for evaluation - Google Patents

Method for producing steel for evaluation Download PDF

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JP6174531B2
JP6174531B2 JP2014147396A JP2014147396A JP6174531B2 JP 6174531 B2 JP6174531 B2 JP 6174531B2 JP 2014147396 A JP2014147396 A JP 2014147396A JP 2014147396 A JP2014147396 A JP 2014147396A JP 6174531 B2 JP6174531 B2 JP 6174531B2
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steel material
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JP2016024003A (en
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憲宏 藤本
憲宏 藤本
孝 澤田
孝 澤田
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Nippon Telegraph and Telephone Corp
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Description

本発明は、評価用鋼材の作製方法に関し、例えばクリープ現象による劣化を評価するための評価用鋼材の作製方法に関する。   The present invention relates to a method for producing an evaluation steel material, for example, a method for producing an evaluation steel material for evaluating deterioration due to a creep phenomenon.

鋼材等の金属材料は、高温下で力が加わり続けると、組織変化、炭化物の粗大化、および空孔や亀裂の発生等が生じ、徐々に塑性変形が進行することがある。この現象は、一般に、クリープ現象と呼ばれている。
クリープ現象による鋼材の耐久性を評価するための試験として、金属材料に定荷重試験機等によって引張力を加えて、ひずみや破断時間等の測定を行うクリープ試験やクリープ破断試験が知られている（非特許文献１参照）。
クリープ現象は常温条件下でも見られる現象であるが、上記クリープ試験等は、通常、高温条件下でクリープ現象による劣化を加速させることによって行われている。 When a force is continuously applied at a high temperature, a metal material such as a steel material may undergo a structural change, carbide coarsening, generation of pores or cracks, and the like, and plastic deformation may gradually progress. This phenomenon is generally called a creep phenomenon.
As tests for evaluating the durability of steel materials due to the creep phenomenon, creep tests and creep rupture tests are known in which tensile force is applied to a metal material with a constant load tester and the like to measure strain and rupture time. (Refer nonpatent literature 1).
The creep phenomenon is a phenomenon that can be seen under normal temperature conditions, but the creep test and the like are usually performed by accelerating deterioration due to the creep phenomenon under high temperature conditions.

ところで、金属材料における空孔の発生は、水素脆化の進行に関係することが知られており（非特許文献２参照）、クリープ現象によって発生する空孔も水素脆化に関与している可能性がある。一方、空孔は１００〜２００℃でアニールすることで消滅することが知られている。そのため、上記のように、高温条件下において鋼材のクリープ現象を加速させて試験を行うと、クリープ現象によって生じた空孔が消滅するため、クリープ現象による鋼材への影響や、クリープ現象により生じた空孔が及ぼす水素脆化に対する影響等を正確に知ることができない。
このような空孔の影響も含めたクリープ現象による鋼材の劣化を精度良く評価するためには、常温条件下において荷重を負荷した試験片（鋼材）を数年間安定な状態で保管することによって、クリープ現象によって経年劣化した鋼材を作製する必要があった。 By the way, it is known that the generation of vacancies in a metal material is related to the progress of hydrogen embrittlement (see Non-Patent Document 2), and vacancies generated by the creep phenomenon may also be involved in hydrogen embrittlement. There is sex. On the other hand, it is known that vacancies disappear by annealing at 100 to 200 ° C. Therefore, as described above, when the test was performed by accelerating the creep phenomenon of steel under high temperature conditions, the voids caused by the creep phenomenon disappeared, so the effect on the steel by the creep phenomenon and the creep phenomenon occurred. The effect of vacancies on hydrogen embrittlement cannot be known accurately.
In order to accurately evaluate the deterioration of steel materials due to the creep phenomenon including the effect of such voids, by storing test pieces (steel materials) loaded under normal temperature conditions in a stable state for several years, It was necessary to produce a steel material that deteriorated over time due to the creep phenomenon.

神鋼溶接サービス株式会社、“（１０）クリープ試験、クリープ破断試験”、［平成２６年７月３日検索］、インターネット＜ＵＲＬ： http://www.sws-shinko.co.jp/pdf/sws_pr_09.pdf>.Shinko Welding Service Co., Ltd., “(10) Creep test, creep rupture test”, [searched July 3, 2014], Internet <URL: http://www.sws-shinko.co.jp/pdf/sws_pr_09 .pdf>. K. Takai et al., ”Lattice defects dominating hydrogen-relatedfailure of metals” 2008, ScienceDirect, Acta MATERIALIA, 56(2008) 5158-5167.K. Takai et al., “Lattice defects dominating hydrogen-relatedfailure of metals” 2008, ScienceDirect, Acta MATERIALIA, 56 (2008) 5158-5167.

しかしながら、常温条件下において荷重を加えた状態の鋼材（試験片）を作製するためには、長期間、定荷重試験機などの大型の試験装置を占有しなければならないという問題がある。   However, in order to produce a steel material (test piece) in a state where a load is applied under normal temperature conditions, there is a problem that a large-scale test apparatus such as a constant load tester must be occupied for a long period of time.

そこで、本願発明者は、本願発明に先立って、大型の試験装置を長期間占有することなく、常温条件下において荷重を加えた状態で安定させた評価用鋼材を作製する方法として、プレストレストコンクリートの製造方法を用いることを検討した。しかしながら、プレストレストコンクリートの製造方法を用いた場合、以下に示すような問題があることが明らかとなった。   Therefore, prior to the present invention, the inventor of the present application, as a method of producing a steel material for evaluation that is stabilized in a state of applying a load under normal temperature conditions without occupying a large test apparatus for a long time, The use of manufacturing methods was studied. However, when the prestressed concrete manufacturing method was used, it became clear that there existed the following problems.

一般に、プレストレストコンクリートの製造方法として、コンクリートを打設する前に鋼線に張力を与えるプレテンション方式と、コンクリートを打設した後に鋼線に張力を与えるポストテンション方式の２つの方式が知られている。
プレテンション方式によって荷重を負荷した鋼材（試験片）を作製する場合、コンクリートと鋼材の付着力でプレストレスを保持するため、丸棒状の鋼材をそのまま用いることができず、鋼材の形状を異形にする（例えば鋼材に凹凸を設ける）必要がある。 In general, there are two known methods for producing prestressed concrete: a pre-tension method that applies tension to the steel wire before placing concrete and a post-tension method that applies tension to the steel wire after placing concrete. Yes.
When producing a steel material (test specimen) loaded with the pre-tension method, the prestress is maintained by the adhesion between concrete and steel material, so the round bar-shaped steel material cannot be used as it is, and the shape of the steel material is irregular. (For example, unevenness is provided in the steel material).

一方，ポストテンション方式によって荷重を加えた鋼材を作製する場合、プレテンション導入後にグラウトを導入する必要があり、通常のコンクリートの打設と比較して、コストが高く、また、高度な技術が必要となる。   On the other hand, when producing a steel material with a load applied by the post tension method, it is necessary to introduce grout after the pre-tension is introduced, which is more costly and requires advanced technology compared to ordinary concrete placement. It becomes.

本発明は、上記の問題に鑑みてなされたものであり、本発明の目的は、大型の試験装置を長期間占有することなく、荷重を加えた状態で安定させた鋼材を容易に作製できるようにすることにある。   The present invention has been made in view of the above-described problems, and an object of the present invention is to make it possible to easily produce a steel material stabilized in a loaded state without occupying a large test apparatus for a long period of time. Is to make it.

本発明に係る評価用鋼材の作製方法は、型枠を構成し、互いに対向する２つの壁部材（１０１Ａ、１０１Ｂ）に夫々形成された貫通孔（１０１１、１０１２）に棒状の鋼材（１０）を挿入する第１工程（Ｓ１０１）と、前記第１工程の後に、前記鋼材の軸方向に荷重（Ｓ）を加えた状態で固定部材（１０２）によって前記鋼材を前記型枠に固定する第２工程（Ｓ１０２）とを含むことを特徴とする。   In the method for producing a steel material for evaluation according to the present invention, a rod-shaped steel material (10) is formed in through holes (1011 and 1012) that are formed in two wall members (101A and 101B) that constitute a mold and are opposed to each other. A first step (S101) to be inserted and a second step of fixing the steel material to the formwork by a fixing member (102) in a state where a load (S) is applied in the axial direction of the steel material after the first step. (S102).

上記評価用鋼材の作製方法において、前記第２工程の後に、前記型枠内にコンクリート（１０３）を打設する第３工程（Ｓ１０３）を含んでもよい。   The method for producing a steel material for evaluation may include a third step (S103) of placing concrete (103) in the mold after the second step.

上記評価用鋼材の作製方法において、前記固定部材は、ナットであり、前記鋼材は、前記型枠から露出した部分の表面の一部にねじ山（１０Ａ）が形成され、前記第２工程は、前記ナットを前記鋼材のねじ山に締め付けることによって、前記鋼材を前記型枠に固定する工程を含んでもよい。   In the method for producing a steel material for evaluation, the fixing member is a nut, and the steel material has a thread (10A) formed on a part of a surface of a portion exposed from the mold, and the second step includes: You may include the process of fixing the steel material to the formwork by tightening the nut to the thread of the steel material.

上記評価用鋼材の作製方法において、前記鋼材の前記型枠から露出した部分を両側から引っ張ることにより前記鋼材の軸方向に荷重を加える工程を含んでもよい。   The method for producing the steel material for evaluation may include a step of applying a load in the axial direction of the steel material by pulling a portion of the steel material exposed from the mold from both sides.

なお、上記説明において括弧を付した参照符号は、図面において当該参照符号が付された構成要素の概念に含まれるものを例示するに過ぎない。   In the above description, the reference numerals with parentheses merely exemplify what are included in the concept of the constituent elements with the reference numerals in the drawings.

本発明によれば、大型の試験装置を長期間占有することなく、荷重を加えた状態で安定させた鋼材を容易に作製することが可能となる。   ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to produce easily the steel material stabilized in the state which added the load, without occupying a large sized test apparatus for a long period of time.

図１は、本発明の一実施の形態に係る評価用鋼材の作製方法によって作製される試験片の材料となる鋼材の一例を示す図である。FIG. 1 is a diagram showing an example of a steel material that is a material of a test piece manufactured by a method for manufacturing an evaluation steel material according to an embodiment of the present invention. 図２は、本発明の一実施の形態に係る評価用鋼材の作製方法において用いる枠型の一例を示す図である。FIG. 2 is a diagram showing an example of a frame mold used in the method for producing an evaluation steel material according to an embodiment of the present invention. 図３は、本発明の一実施の形態に係る評価用鋼材の作製方法を説明するためのフローチャートである。FIG. 3 is a flowchart for explaining a method for producing an evaluation steel material according to an embodiment of the present invention. 図４Ａは、本発明の一実施の形態に係る評価用鋼材の作製方法の各工程を説明するための図である。FIG. 4A is a diagram for explaining each step of a method for producing an evaluation steel material according to an embodiment of the present invention. 図４Ｂは、本発明の一実施の形態に係る評価用鋼材の作製方法の各工程を説明するための図である。Drawing 4B is a figure for explaining each process of a production method of the steel material for evaluation concerning one embodiment of the present invention. 図４Ｃは、本発明の一実施の形態に係る評価用鋼材の作製方法の各工程を説明するための図である。FIG. 4C is a diagram for explaining each step of the method for producing the evaluation steel material according to the embodiment of the present invention. 図４Ｄは、本発明の一実施の形態に係る評価用鋼材の作製方法の各工程を説明するための図である。FIG. 4D is a diagram for explaining each step of the method for producing the steel for evaluation according to the embodiment of the present invention. 図５は、本発明の一実施の形態に係る評価用鋼材の作製方法によって製造された試験片の一例を示す図である。FIG. 5 is a view showing an example of a test piece manufactured by a method for producing an evaluation steel material according to an embodiment of the present invention.

以下、本発明の実施の形態について図を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

先ず、本実施の形態に係る方法によって評価用鋼材を作製する準備段階として、予め、評価対象の試験片の材料となる鋼材１０と型枠１０１を用意しておく。
図１は、本発明の一実施の形態に係る評価用鋼材の作製方法によって作製される試験片の材料となる鋼材の一例を示す図である。図２は、本発明の一実施の形態に係る評価用鋼材の作製方法において用いる枠型の一例を示す図である。 First, as a preparation stage for producing an evaluation steel material by the method according to the present embodiment, a steel material 10 and a mold 101 that are materials of a test piece to be evaluated are prepared in advance.
FIG. 1 is a diagram showing an example of a steel material that is a material of a test piece manufactured by a method for manufacturing an evaluation steel material according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a frame mold used in the method for producing an evaluation steel material according to an embodiment of the present invention.

図１に示される鋼材１０は、評価対象の試験片の材料となる鋼を主成分とした合金であり、例えば丸棒状に形成されている。鋼材１０としては、例えば、Ｆｅ−Ｓｉ合金（Ｓｉ：０．２５％）から成り、引張強度が１４５０ＭＰａ、直径Φが９ｍｍの高強度の鋼棒を用いることができる。   A steel material 10 shown in FIG. 1 is an alloy having steel as a main component as a material of a test piece to be evaluated, and is formed in a round bar shape, for example. As the steel material 10, for example, a high-strength steel rod made of an Fe—Si alloy (Si: 0.25%), having a tensile strength of 1450 MPa and a diameter Φ of 9 mm can be used.

図２に示される型枠１０１は、鋼材１０を固定するためのものである。型枠１０１は、例えば、平面視矩形状で箱状の部材である。型枠１０１の側面を構成する壁部材１０Ａ、１０Ｂは、例えば鋼を主成分とする金属材料から構成されており、後述するように鋼材１０に引張力を加えた状態で固定しても、型枠１０１が変形しない程度の強度を有している。   A mold 101 shown in FIG. 2 is for fixing the steel material 10. The mold 101 is a box-like member having a rectangular shape in plan view, for example. The wall members 10A and 10B constituting the side surface of the mold 101 are made of, for example, a metal material whose main component is steel, and even if the steel member 10 is fixed in a state where a tensile force is applied as described later, The frame 101 has such a strength that it does not deform.

図２示されるように、型枠１０１の互いに対向する２つの壁部材１０１Ａ、１０１Ｂには、貫通孔１０１１、１０１２が夫々形成されている。貫通孔１０１１、１０１２の形状は、鋼材１０の軸線に直交する断面形状に合わせて形成されている。例えば、後述するように貫通孔１０１１，１０１２に鋼材１０を挿入したときに、貫通孔１０１１，１０１２と鋼材１０との間に隙間ができないように、貫通孔１０１１、１０１２の径が調整されている。   As shown in FIG. 2, through holes 1011 and 1012 are formed in two wall members 101 </ b> A and 101 </ b> B of the mold 101 facing each other. The shape of the through holes 1011 and 1012 is formed in accordance with the cross-sectional shape orthogonal to the axis of the steel material 10. For example, as described later, when the steel material 10 is inserted into the through holes 1011 and 1012, the diameters of the through holes 1011 and 1012 are adjusted so that there is no gap between the through holes 1011 and 1012 and the steel material 10. .

また、型枠１０１のサイズは、試験片としての鋼材の長さに応じて適宜決定することができる。例えば、鋼材の長さが４０〜５０ｃｍ程度の試験片を作製する場合には、型枠１０１の貫通孔１０１１，１０１２に鋼材１０を挿入したときに、型枠１０１内の鋼材１０の長さが４０〜５０ｃｍ程度になるように型枠１０１のサイズ（長さＬと幅Ｗ）を決めれば良い。なお、型枠１０１の高さＨは、例えば、後述するように型枠１０１内にコンクリートを打設したときに、型枠１０１内の鋼材１０がコンクリートに十分に埋まるように決定すれば良い。   Moreover, the size of the mold 101 can be appropriately determined according to the length of the steel material as the test piece. For example, when producing a test piece having a length of about 40 to 50 cm, the length of the steel material 10 in the mold 101 when the steel material 10 is inserted into the through holes 1011 and 1012 of the mold 101. What is necessary is just to determine the size (length L and width W) of the formwork 101 so that it may become about 40-50 cm. The height H of the mold 101 may be determined so that the steel material 10 in the mold 101 is sufficiently embedded in the concrete when concrete is placed in the mold 101 as described later, for example.

図３は、本発明の一実施の形態に係る評価用鋼材の作製方法を説明するためのフローチャートである。図３には、例えば鉄筋コンクリート等に用いられる鋼材のクリープ現象による劣化を評価するために、その評価に用いる試験片としての評価用鋼材を作製する手順が示されている。   FIG. 3 is a flowchart for explaining a method for producing an evaluation steel material according to an embodiment of the present invention. FIG. 3 shows a procedure for producing an evaluation steel material as a test piece used for evaluation in order to evaluate deterioration due to a creep phenomenon of a steel material used for reinforced concrete, for example.

本発明の一実施の形態に係る評価用鋼材の作製方法では、先ず、図４Ａに示されるように、型枠１０１の２つの貫通孔１０１１、１０１２に鋼材１０を挿入する（Ｓ１０１）。   In the method for producing an evaluation steel material according to an embodiment of the present invention, first, as shown in FIG. 4A, the steel material 10 is inserted into the two through holes 1011 and 1012 of the mold 101 (S101).

次に、鋼材１０の型枠１０１から露出した部分を両側から引っ張ることにより、鋼材１０の軸方向に引張力を加えた状態で固定部材１０２によって鋼材１０を型枠１０１に固定する（Ｓ１０２）。
具体的には、図４Ｂに示されるように、鋼材１０の型枠１０１から露出した部分の両側を例えばジャッキ等によって一定の力Ｓで引っ張ることにより、鋼材１０に荷重を加える。鋼材１０に与える応力（引張力）の大きさは、試験内容に応じて適宜調整すればよい。例えば、ＪＩＳ Ａ ５３６４の試験を行う場合には、鋼材１０の引張強度の０．７倍の応力を与えればよい。 Next, the steel material 10 is fixed to the mold frame 101 by the fixing member 102 in a state where a tensile force is applied in the axial direction of the steel material 10 by pulling a portion of the steel material 10 exposed from the both sides from both sides (S102).
Specifically, as shown in FIG. 4B, a load is applied to the steel material 10 by pulling both sides of a portion of the steel material 10 exposed from the mold 101 with a constant force S using, for example, a jack. What is necessary is just to adjust suitably the magnitude | size of the stress (tensile force) given to the steel material 10 according to the content of a test. For example, when the test of JIS A 5364 is performed, a stress that is 0.7 times the tensile strength of the steel material 10 may be applied.

固定部材１０２は、鋼材１０に荷重を加えた状態で鋼材１０を型枠１０１に固定するための部材であり、例えばナットを用いることができる。
固定部材１０２としてナットを用いる場合、図４Ｂに示すように鋼材１０の型枠１０１から露出した部分の表面にねじ山１０Ａを形成しておき、図４Ｃに示すように、ジャッキ等によって一定の力Ｓで引っ張った状態において鋼材１０の２つのねじ山１０Ａにナット１０２を夫々締め付けることによって、鋼材１０を型枠１０１に固定する。鋼材１０をナット１０２によって型枠１０１に固定したら、鋼材１０をジャッキ等から取り外す。 The fixing member 102 is a member for fixing the steel material 10 to the mold 101 in a state where a load is applied to the steel material 10, and for example, a nut can be used.
When a nut is used as the fixing member 102, a thread 10A is formed on the surface of the portion exposed from the mold 101 of the steel material 10 as shown in FIG. 4B, and a constant force is applied by a jack or the like as shown in FIG. 4C. In the state pulled by S, the steel material 10 is fixed to the mold frame 101 by fastening the nuts 102 to the two screw threads 10A of the steel material 10 respectively. After the steel material 10 is fixed to the mold 101 with the nut 102, the steel material 10 is removed from the jack or the like.

なお、ねじ山１０Ａは、例えば、ステップＳ１０１で鋼材１０を貫通孔１０１１、１０１２に挿入する前に形成しても良いし、鋼材１０を貫通孔１０１１、１０１２に挿入した後に形成しても良く、ねじ山１０Ａを形成するタイミングに特に制限はない。   The screw thread 10A may be formed, for example, before the steel material 10 is inserted into the through holes 1011 and 1012 in step S101, or may be formed after the steel material 10 is inserted into the through holes 1011 and 1012. There is no restriction | limiting in particular in the timing which forms the screw thread 10A.

次に、型枠１０１にコンクリートを打設する（Ｓ１０３）。具体的には、図４Ｄに示されるように、セメント、砂、砂利、および水を予め決めた分量で配合したコンクリート１０３を型枠１０１内に流し込み、養生させる。その後、コンクリート１０３が固まったら、ナット１０２を残して鋼材１０の両端部を切断する（Ｓ１０４）。これにより、図５に示されるような、引張力が加えられた試験片（評価用鋼材）１を作製することができる。   Next, concrete is placed on the mold 101 (S103). Specifically, as shown in FIG. 4D, concrete 103 in which cement, sand, gravel, and water are mixed in a predetermined amount is poured into the mold 101 and cured. After that, when the concrete 103 is hardened, both ends of the steel material 10 are cut leaving the nut 102 (S104). Thereby, the test piece (steel material for evaluation) 1 to which a tensile force is applied as shown in FIG. 5 can be produced.

以上、本実施の形態に係る評価用鋼材の作製方法によれば、定荷重試験機等の大型の試験装置を用いることなく、常温条件下において荷重を加えた状態の評価用鋼材を作製することが可能となる。これにより、例えば風雨にさらされない屋内等の予め決められた場所に作製した試験片１を設置して、予め決められた期間だけ保管し、試験片１を調べることにより、クリープ現象による鋼材の劣化を評価することが可能となる。   As described above, according to the method for producing an evaluation steel material according to the present embodiment, an evaluation steel material in a state where a load is applied under normal temperature conditions can be produced without using a large-sized test apparatus such as a constant load tester. Is possible. Accordingly, for example, by installing the test piece 1 prepared in a predetermined place such as indoors where it is not exposed to wind and rain, storing it for a predetermined period, and examining the test piece 1, thereby deteriorating the steel material due to the creep phenomenon. Can be evaluated.

また、本実施の形態に係る評価用鋼材の作製方法によれば、鋼材１０を型枠１０１に固定した後に、枠型１０１内にコンクリートを打設するので、鋼材１０の表面に形成された不働態膜とそれを覆うアルカリ性のコンクリートにより、荷重を加えた状態の鋼材１０１を非常に安定した状態で保管することが可能となる。   In addition, according to the method for producing an evaluation steel material according to the present embodiment, since the concrete is placed in the frame mold 101 after the steel material 10 is fixed to the mold frame 101, the irregularities formed on the surface of the steel material 10 are not affected. Due to the working film and the alkaline concrete covering the working film, the steel material 101 under a load can be stored in a very stable state.

また、本実施の形態に係る評価用鋼材の作製方法によれば、プレストレストコンクリートの製造方法をそのまま適用する場合に比べて、制約が少なく、容易に評価用鋼材を作製することが可能となる。例えば、本作製方法によれば、プレストレステンション方式のようにコンクリートと鋼材との付着力を利用してプレストレスを保持するのではなく、固定部材によって鋼材を型枠に固定することにより鋼材に加える荷重を一定にするので、例えば丸棒状の鋼材をそのまま用いることができ、鋼材の形状を異形にする等の制約が少ない。また、ポストテンション方式のようにグラウトを導入する必要がないので、高度な技術が不要となり、作製コストも抑えることができる。   In addition, according to the method for producing an evaluation steel material according to the present embodiment, the evaluation steel material can be easily produced with less restrictions compared to the case where the prestressed concrete production method is applied as it is. For example, according to this production method, the prestress is not retained using the adhesion force between concrete and steel as in the prestress tension method, but the steel is fixed to the formwork by fixing the steel to the formwork by a fixing member. Since the load to be applied is constant, for example, a round bar-shaped steel material can be used as it is, and there are few restrictions such as making the shape of the steel material irregular. Further, since it is not necessary to introduce grout as in the post-tension method, advanced technology is not required, and manufacturing costs can be reduced.

また、本実施の形態に係る評価用鋼材の作製方法によれば、固定部材としてナットを用いるので、容易に、鋼材を型枠に固定して荷重を加えることが可能となる。   Moreover, according to the method for producing an evaluation steel material according to the present embodiment, since a nut is used as a fixing member, it is possible to easily fix the steel material to the mold and apply a load.

以上、本発明者らによってなされた発明を実施の形態に基づいて具体的に説明したが、本発明はそれに限定されるものではなく、その要旨を逸脱しない範囲において種々変更可能であることは言うまでもない。   Although the invention made by the present inventors has been specifically described based on the embodiments, it is needless to say that the present invention is not limited thereto and can be variously modified without departing from the gist thereof. Yes.

例えば、上記実施の形態において、鋼材１０を型枠１０１に固定した後に枠型１０１内にコンクリートを打設する場合を例示したが、例えば温度や湿度等が管理された場所に試験片１を長期間保管することができる場合には、枠型１０１内にコンクリートを打設しなくても良い。これによれば、作業工程を減らすことができるので、評価用鋼材の作製コストの更なる低減を図ることができる。   For example, in the above embodiment, a case where concrete is placed in the frame mold 101 after the steel material 10 is fixed to the mold frame 101 is illustrated. However, for example, the test piece 1 is extended to a place where temperature, humidity, and the like are controlled. When it can be stored for a period of time, it is not necessary to place concrete in the frame mold 101. According to this, since a work process can be reduced, the further reduction of the production cost of the steel material for evaluation can be aimed at.

また、上記実施の形態において、鋼材１０に引張力を加えて型枠１０１に固定する場合を例示したが、例えば鋼材の圧縮試験用の試験片を作製する場合には、鋼材１０を両端から圧縮させた状態で型枠１０１の内側からナット１０２で固定してもよい。   Moreover, in the said embodiment, although the case where the tensile force was applied to the steel material 10 and it fixed to the mold 101 was illustrated, when producing the test piece for the compression test of steel materials, for example, the steel material 10 is compressed from both ends. In this state, the nuts 102 may be fixed from the inside of the mold 101.

また、上記実施の形態において、鋼材１０が丸棒形状である場合を例示したが、これに限られず、例えば鋼材１０が角状であってもよい。   Moreover, in the said embodiment, although the case where the steel material 10 was a round bar shape was illustrated, it is not restricted to this, For example, the steel material 10 may be square shape.

また、上記実施の形態において、型枠１０１が平面視矩形状である場合を例示したが、対向する２つの壁部材に形成された貫通孔に挿入した鋼材に荷重を加えた状態で型枠に固定することができれば、型枠の形状に特に制限はない。   Moreover, in the said embodiment, although the case where the formwork 101 was a planar view rectangular shape was illustrated, in the state which applied the load to the steel materials inserted in the through-hole formed in the two opposing wall members, There is no particular limitation on the shape of the mold as long as it can be fixed.

１…試験片（評価用鋼材）、１０…鋼材、１０Ａ…ねじ山、１０１…型枠、１０１１、１０１２…貫通孔、１０１Ａ、１０１Ｂ…壁部材、１０２…固定部材（ナット）、１０３…コンクリート、引張力…Ｓ。   DESCRIPTION OF SYMBOLS 1 ... Test piece (steel material for evaluation), 10 ... Steel material, 10A ... Thread, 101 ... Formwork, 1011, 1012 ... Through-hole, 101A, 101B ... Wall member, 102 ... Fixing member (nut), 103 ... Concrete, Tensile force ... S.

Claims (4)

型枠を構成し、互いに対向する２つの壁部材に夫々形成された貫通孔に棒状の鋼材を挿入する第１工程と、
前記第１工程の後に、前記鋼材の軸方向に荷重を加えた状態で固定部材によって前記鋼材を前記型枠に固定する第２工程と、を含む
ことを特徴とする評価用鋼材の作製方法。 A first step of constituting a formwork and inserting a rod-shaped steel material into through-holes respectively formed in two wall members facing each other;
After the first step, a second step of fixing the steel material to the formwork by a fixing member in a state in which a load is applied in the axial direction of the steel material. 請求項１に記載の評価用鋼材の作製方法において、
前記第２工程の後に、前記型枠内にコンクリートを打設する第３工程を含む
ことを特徴とする評価用鋼材の作製方法。 In the manufacturing method of the steel materials for evaluation according to claim 1,
After the second step, the method includes a third step of placing concrete in the mold. 請求項１または２に記載の評価用鋼材の作製方法において、
前記固定部材は、ナットであり、
前記第１工程の前あるいは後に、前記鋼材には、前記型枠から露出する部分の表面の一部にねじ山を形成し、
前記第２工程は、前記ナットを前記鋼材のねじ山に締め付けることによって、前記鋼材を前記型枠に固定する工程を含む
ことを特徴とする評価用鋼材の作製方法。 In the manufacturing method of the steel material for evaluation of Claim 1 or 2,
The fixing member is a nut;
Wherein before or after the first step, wherein the steel material, the thread is formed on part of the surface of the portion exposed from the mold,
Said 2nd process includes the process of fixing the said steel material to the said formwork by fastening the said nut to the thread of the said steel material. The manufacturing method of the steel material for evaluation characterized by the above-mentioned. 請求項１乃至３の何れか一項に記載の評価用鋼材の作製方法において、
前記第２工程は、前記鋼材の前記型枠から露出した部分を両側から引っ張ることにより前記鋼材の軸方向に荷重を加える工程を含む、
ことを特徴とする評価用鋼材の作製方法。 In the manufacturing method of the steel material for evaluation as described in any one of Claims 1 thru | or 3,
The second step includes a step of applying a load in the axial direction of the steel material by pulling a portion exposed from the mold of the steel material from both sides.
A method for producing a steel material for evaluation characterized by the above.
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