201219632 六、發明說明： 【發明所屬之技術領域】 本發明是鋼管補強撐材及其製造方法，尤其是有關設 置在建築物等鋼結構物的鋼管補強撐材及其製造方法。 【先前技術】 設置在鋼結構物的鋼管補強撐材是將扁鋼所成的軸材 插入補強鋼管對角線的位置，壓縮力作用於軸材的長方向 時約束面外（長方向的直角方向）的撓曲，可增大能量吸 收能力。 此時’軸材與補強鋼管內面即使滑動而爲了防止摩擦 聲音的發生或爲了降低摩擦，將墊板插入兩者的間隙，或 是對鋼結構物的確實設置，在軸材的管軸方向的端部設置 比補強鋼管對角線長度寬的寬接頭構件（以下稱「端構件 j ) ° 此外’揭不有可谷易進行塾片的插入，並可提闻端構 件形狀的自由度的撐材（與鋼管補強撐材相同）的製造方 法（例如，參閱專利文獻1 )。 ' 〔先前技術文獻〕 ' 〔專利文獻〕 〔專利文獻1〕日本特開20(Π-1321 12號公報（第3-4頁 、第2圖） 【發明內容】 -5- 201219632 〔發明所欲解決的課題〕 上述專利文獻1所揭示的撐材的製造方法是將一對鋼 板彎曲加工成剖面逆C字型或剖面〈字型（或可爲L字型 。以下皆同），配置該等包圍著軸材，並將各個側緣彼此 焊接接合形成剖面矩形的補強鋼管。 因此，可容易進行墊板的配置，並提升間隙的精度， 提高補強效果。此外，可選定端構件的形狀而不爲補強鋼 管的大小所左右但具有以下的問題。 (a)補強鋼管爲長尺寸，爲了精度良好地進行長尺 寸的扁鋼的彎曲加工，必須具備有相當能力的高壓機。因 此，從製造用之設備上的限制，會導致製造者（ applicator)的限定。 (b )針對扁鋼的彎曲加工所形成的補強鋼管，軸材 相對的補強鋼管外側角部的曲率半徑在扁鋼的板厚爲6mm 以上的場合，必須要板厚的1 0倍以上，小於板厚的1 0倍的 場合必須取得特別材料的認定（參照日本建築基準法「 H12建告2464第1三號八」）。因此，爲確實抑制面外壓曲 必須取得特別材料的認定。 因此，不須進行彎曲加工，並配置可包圍軸材的補強 鋼管的製造方法可考慮將4片扁鋼焊接成角形狀加以組裝 方法（以下稱「焊接4面箱」）。但是，使用焊接4面箱作 爲鋼管補強撐材的補強鋼管的場合，會有以下的問題。 (c )在主軸材的側緣附近，由於藉主軸材的面外壓 曲對補強鋼管施加由內側向外擴開的力，因此鋼管角部的 -6- 201219632 焊接上，對板厚內面側有未焊接的部份使用熔透焊接時， 會降低補強效果，形成鋼管斷裂的起點。 (d)對鋼管角部的焊接使用焊接板厚全厚的完全熔 透焊接的場合，有在鋼管內側（鋼管內面側）設置襯環的 必要，會與軸材或墊板接觸，不能確保適當的間隙。 本發明是爲解決上述問題所硏創而成，提供一種不須 進行扁鋼的彎曲加工，並可防止鋼管的斷裂，並可形成確 保適當間隙的補強鋼管的撐材之製造方法及藉該製造方法 所製造的撐材爲目的。 〔解決課題用的手段〕 (1) 本發明涉及的鋼管補強撐材，具有：扁鋼所成 的主軸材，及包圍該主軸材約束該主軸材的面外變形用的 補強鋼管，其特徵爲： 上述補強鋼管是將4片的扁鋼側緣對接’藉部份熔透 焊接形成外側角部，並藉著塡角焊形成與上述主軸材側緣 相對的鋼管內側角隅部，形成爲剖面矩形。 (2) 並且，上述（1)中’其特徵爲：在上述補強鋼 管的塡角焊後的內側角隅部和上述主軸材的側緣的間隙， 配置有墊板。 (3) 另外’上述（1)或（2)中’其特徵爲：上述 主軸材的側面設置有扁鋼所成的副軸材。 (4) 又，上述（1)至（3)的任一項中’其特徵爲 :上述主軸材軸方向的端部設置有比上述補強鋼管對角線 201219632 的長度寬的扁鋼所成的端構件。 (5)本發明涉及的鋼管補強撐材之製造方法，具有 :扁鋼所成的主軸材，及包圍該主軸材約束該主軸材的面 外變形用的補強鋼管，其特徵爲： 將一對扁鋼的側緣對接，藉塡角焊內側角隅部成最終 焊接，並藉部份熔透焊接將外側角部在軸方向斷續進行臨 時焊接，形成剖面〈字型的補強構件的步驟； 在上述主軸材的側緣與上述補強構件最終焊接後的內 側角隅部相對的狀態，將一對的補強構件的側緣對接，藉 部份熔透焊接將外側角部在軸方向斷續進行臨時焊接，臨 時組裝剖面矩形的補強鋼管的步驟；及 藉部份熔透焊接進行上述補強鋼管臨時焊接後之外側 角部的最終焊接，最終組裝補強鋼管的步驟。 (6 )並且，最終組裝上述（5 )的補強鋼管的步驟中 ’其特徵爲：同時進行上述補強鋼管臨時焊接後之外側角 部中的2處外側角部的最終焊接。 (7) 另外，上述（5)或（6)中，其特徵爲：臨時 組裝上述補強鋼管的步驟之前，具有在上述補強構件最終 焊接後的內側角隅部和上述主軸材側緣的間隙，配置墊板 的步驟。 (8) 另外，上述（5)至（7)的任一項中，其特徵 爲：上述主軸材的側面設置有扁鋼所成的副軸材。 (9) 另外，上述（5)至（8)的任一項中，其特徵 爲：上述主軸材軸方向的端部設置有比上述補強鋼管對角 -8- 201219632 線的長度寬的扁鋼所成的端構件。 〔發明效果〕 (I )本發明涉及的鋼管補強撐材是將4片的扁鋼側緣 對接，藉部份熔透焊接形成外側角部，並藉著塡角焊形成 與上述主軸材側緣相對的鋼管內側角隅部，形成爲剖面矩 形，不須進行扁鋼的彎曲加工，並可對主軸材的面外壓曲 產生從鋼管內側的推壓力以防止補強鋼管的破裂。 再者，除去和主軸材的側緣相對之鋼管內側角隅部的 內面角隅部雖未實施塡角焊，但是對於後者不會產生有如 前者的應力，因此補強鋼管不會斷裂。 並且，在與主軸材的側緣相對的鋼管內側角隅面沒有 設置襯環的必要，補強鋼管與軸材或墊板之間，可確保適 當的間隙。 (II) 並且，在補強鋼管的內側角隅部和主軸材側緣 的間隙配置有墊板，因此可正確約束主軸材的面外變形（ 撓曲），且即使兩者滑動仍可獲得摩擦聲的發生防止及摩 擦的降低。 (III) 另外，在主軸材的側面設置有扁鋼所成的副軸 材，因此可約束軸方向對壓縮力的面外變形，增大吸收能 量。 (IV) 又，在主軸材軸方向的端部設置有比補強鋼管 對角線的長度寬的扁鋼所成的端構件，因此可確實形成對 鋼結構物的連接，使得主軸材的能量吸收更爲確實。 -9 - 201219632 (V) 此外’本發明所涉及鋼管補強撐材之製造方法 ，具有：藉塡角焊內側角隅部成最終焊接，並藉部份熔透 焊接來臨時焊接外側角部形成補強構件的步驟；藉部份熔 透焊接來臨時焊接外側角部進行補強鋼管臨時組裝的步驟 ;及藉部份熔透焊接來最終焊接外側角部進行補強鋼管最 終組裝的步驟’因此不須進行扁鋼的彎曲加工，並可抑制 因焊接熱導致鋼管的彎曲或翹曲形成補強鋼管。 (VI) 並以排列配置的半自動焊接機同時進行補強鋼 管臨時焊接後之外側角部中的2處外側角部來進行補強鋼 管的最終組裝’因此可減少焊接時使鋼管補強撐材旋轉的 次數，縮短製造步驟。 (VII )另外’在補強構件臨時組裝之前具有配置墊 板的步驟’因此可容易進行墊板的配置，並可提高精度， 提升補強效果。 (VIII )並在上述主軸材的側面設置有扁鋼所成的副 軸材’可約束軸方向對壓縮力的面外變形，增大吸收能量 〇 (IX)又由於製造時端構件不貫穿補強鋼管的內部， 因此端構件的大小或形狀不會爲補強鋼管的大小所左右。 因此’可設置比補強鋼管對角線的長度寬的扁鋼所成的端 構件’可形成對鋼結構物的連接，使主軸材的能量吸收更 爲確實。 【實施方式】 -10- 201219632 〔實施形態1〕 第1圖及第2圖是說明本發明實施形態1所涉及的鋼管 補強撐材，第1圖的（a )爲上視圖，第1圖的（b )圖側視 圖’第2圖的（a)爲前視方向的剖面圖（第1圖的（b)的 X-X剖面）’第2圖的（b)爲第2圖的（a)部份放大表示 的前視方向的剖面圖。並且，各圖是以模式表示，各構件 相對的大小或板厚等不爲圖示的尺寸所限定。再者，共同 部份的說明中，省略符號的添加文字「a、b」的記載。 (鋼管補強撐材） 第1圖及第2圖中’鋼管補強撐材1〇〇，具有··軸材1〇 ;包圍軸材10約束主軸材的面外變形用的補強鋼管20;在 軸材10長方向的兩端分別固定，可確實對（未圖示）鋼結 構物進行設置用的端構件（相當於接頭構件）30a、30b: 及配置在軸材1 〇的側緣與補強鋼管2 0內面的間隙的墊板 40a 、 40b ° (軸材） 軸材1 0 ’係由：較補強鋼管2 0短的扁鋼所成的主軸材 1 1 ’及分別固定在主軸材1 1兩側面的扁鋼所成的副軸材i 2 、1 3所形成’呈剖面十字型。此時，—方副軸材丨2的側緣 和另一方副軸材1 3的側緣的距離（以下，稱「寬度B 2」） 是形成小於主軸材1 1兩側緣間的距離（以下，稱「寬度B j 」）（B2 < B1 )。 -11 - 201219632 再者，本發明不僅限於軸材1 0的圖示形態，也可以僅 未固定有副軸材12、13的主軸材11。 (補強鋼管） 補強鋼管2 0是比軸材1 0長的剖面四角形的筒狀，將4 片扁鋼21、22、23、：24的側緣彼此互相焊接結合。 亦即，在扁鋼2 1側面對接扁鋼2 2的側端面呈剖面〈字 型，內側角隅部（凹面側的對接部）25a是藉塡角焊W1， 外側角部（凸面側的對接部）25b是藉部份熔透焊接W4 ( 在長方向斷續地部份熔透焊接W24 )來焊接結合。 又，扁鋼23和扁鋼24對接的內側角於部26a及外側角 部26b也同樣實施塡角焊W1及部份熔透焊接W4 (在長方向 斷續地部份熔透焊接W24)。 此外，扁鋼24的側端面對接於扁鋼2 1側面呈剖面〈字 型，角部（凸面側的對接部）28b是以部份熔透焊接W5 ( 在長方向斷續地部份熔透焊接W35)來焊接結合。此時， 角隅部（凹面側的對接部）未施以塡角焊。並且，由於扁 鋼23和扁鋼22的結合也是同樣，因此省略說明。 並且，補強鋼管20是藉以上焊接形態所形成，因此彎 曲或翹曲少，且無矯正的必要。（對此，在實施形態2中 詳細說明。） (端構件） 端構件30a、30b (以下’匯集或一方稱爲「端構件30 -12- 201219632 」），具有：固定於主軸材11的長方向端部的主端構件31 ，及固定在副軸材12、13的長方向端部的副端構件32、33 。主端構件3 1的兩側面固定著副端構件3 2、3 3 ’呈剖面十 字型。 此時，主端構件31及副端構件32在接近軸方向的補強 鋼管20的範圍，寬度變窄，進入到補強鋼管2〇的內部。另 —方面，從補強鋼管20突出的軸方向的端部附近，主端構 件3 1兩側緣間的距離（以下，稱「寬度B3」）及副端構件 32的側緣和另一方的副端構件33的側緣的距離（以下，稱 「寬度B4」）皆充分大於補強鋼管20之內面對角線的長度 〇 此外，以上的說明中，雖在主端構件3 1及副端構件3 2 、33形成有設置於鋼結構物用之螺栓貫穿的貫穿孔34等， 但是本發明不僅限於圖式的形態。例如，也可以不設置貫 穿孔3 4等，而是將主端構件3 1及副端構件3 2、3 3的端部焊 接結合在鋼結構物。此時’在鋼結構物設置有形成和主端 構件3 1及副端構件3 2、3 3所形成端部形狀相同的端部形狀 的角撐板。 (墊板） 墊板40是配置在主軸材1 1的側緣部與補強鋼管2〇內面 的間隙，當主軸材11成面外變形（撓曲）時，適當設定約 束面外變形的變形量’可提升補強效果。又，主軸材丨丨的 側緣部和補強鋼管2 0的內面是透過墊板4 〇對接，不會直接 -13- 201219632 滑動，可獲得摩擦聲的發生防止及摩擦的降低。 再者，形成墊板的材質並不限定爲特定的材質，也可 以是硬質的合成樹脂及天然橡膠或人工橡膠等。 〔實施形態2〕 第3圖〜第5圖是說明本發明實施形態2所涉及的鋼管補 強撐材的製造方法，第3圖是表示各步驟的流程圖，第4圖 的（a)爲模式表示各步驟的上視圖，第4圖的（b)爲其 側視圖，第4圖的（c )爲其前視方向的剖面圖（第4圖的 (b )的X-X剖面），第5圖是分別以模式表示各步驟的前 視方向的剖面圖。並與實施形態1相同部份或相當的部份 賦予相同符號，省略一部份的說明。 第3圖及第4圖中，補強鋼管撐材的製造方法，具有： 在扁鋼所成的主軸材1 1的兩側面分別固定扁鋼所成的副軸 材1 2、1 3，形成剖面十字型的軸材1 〇的第1步驟（S 1 )， 及在軸材10的兩端部分別固定剖面十字型的端構件30a、 30b的第2步驟（S2 )。 此時，在主端構件3 1的兩側面分別固定副端構件32、 3 3形成剖面十字型的端構件3 0之後’分別將主端構件3 1固 定在主軸材1 1 ’將副端構件3 2、3 3固定在副軸材1 2、1 3 ’ 或者也可以分別將主端構件3 1固定在主軸材1 1 ’將副端構 件3 2、3 3固定在副軸材1 2、1 3之後’形成剖面十字型的端 構件3 0。 另外，也可以在主端構件31和主軸材11的連接物上’ -14- 201219632 固定副端構件3 2、3 3與副軸材1 2、1 3，即同時執行第1步 驟與第2步驟。 第3圖及第5圖的（a)中，接著形成補強構件25、26 。亦即，具有將扁鋼22的端面對接在扁鋼21的側面，形成 剖面〈字型，藉塡角焊W1進行內側角隅部25a的最終焊接 ，並藉著部份熔透焊接W2將凸面側的角部（以下，稱「 外側角部」）25b在軸方向斷續進行臨時焊接，形成剖面 〈字型的補強構件25，同樣地形成補強構件26的第3步驟 (S3)。以下，有稱上述對接部爲「主軸材角隅部」的場 合。 此時，對扁鋼22的兩側緣預先施以倒角（C倒角）加 工，因此外面角部在扁鋼2 2的板厚中間形成有底的k型斜 切（單刃型斜切）。並對於扁鋼23、24也同樣形成補強構 件26。 再者，部份熔透焊接W2是指熔透深度比扁鋼22的板 厚淺，殘留爲焊接部的焊接，在長方向（補強鋼管2 0的長 方向）進行斷續地焊接熔透。例如，指每以1 m間隔有 5 0mm長度的1層或少數層的隆起。 第3圖及第5圖的（b)中，接著，具有在軸材10的主 軸材1 1的兩側緣對接墊板40a、40b的第4步驟（S4 )。 第3圖及第5圖的（c)中，接著，臨時組裝包圍軸材 1 0的補強鋼管2 0。即，具有使軸材1 0的主軸材1 1的兩側緣 ，透過墊板40與補強構件25、26的內側角隅部對向的方式 ，以補強構件25、26包圍軸材10，並使得補強構件25和補 -15- 201219632 強構件26的側緣彼此（正確爲扁鋼22與扁鋼23的側緣彼此 、扁鋼24與扁鋼21的側緣彼此）對接，將外側角部27a、 28b以部份熔透焊接W3在軸方向斷續進行臨時焊接’以臨 時組裝剖面矩形的補強鋼管20的第5步驟（S5)。 此時，形成補強構件25與補強構件26側緣彼此的對接 部（以下，有稱爲「副軸材角隅部」的場合）的內側角隅 部27 a、28a不予焊接，部份熔透焊接W3是以部份熔透焊接 W2爲準，使得熔透深度比扁鋼22、24的板厚還淺，在板 厚方向殘留著未焊接部，並在長方向斷續地加以焊接，因 此來自外側的焊接不會熔透內側角隅部27a、28a。 第3圖及第5圖的（d)中，接著，最終組裝補強鋼管 20。即，具有使部份熔透焊接W2、W3所執行的外側角部 25b、26b及外側角部27b、28b，分別藉部份熔透焊接W4 、W5進行最終焊接，最終組裝補強鋼管20的第6步驟（S6 )° 此時，在外側角部25b、26b以長方向斷續地執行部份 熔透焊接W2，可部份地執行部份熔透焊接W4熔透於部份 熔透焊接W2上的部份熔透焊接W24。 同樣地，在外側角部27b、2 8b以長方向斷續地執行部 份熔透焊接W3，可部份地執行部份熔透焊接W5熔透於部 份熔透焊接W3上的部份熔透焊接W3 5。 如上述，本發明所涉及鋼管補強撐材的製造方法是以 臨時焊接外側角部25b、26b的一對補強構件25、26包圍著 端構件30固定後狀態的軸材1 〇，臨時焊接一對補強構件25 -16- 201219632 、26的外側角部27b、2 8b以臨時組裝補強鋼管20之後，在 保持著矩形的狀態下最終焊接進行最終組裝，不須進行扁 鋼2 1等的彎曲加工，並且，可形成抑制最終焊接時因焊接 熱的影響而使得扁鋼21等彎曲或翹曲的補強鋼管20。 〔實施形態3〕 第6圖是說明本發明實施形態3所涉及鋼管補強撐材的 製造方法的圖，模式表示第6步驟（S6 )的前視方向的剖 面圖。並與實施形態2相同部份或相當的部份賦予相同符 號，省略一部份的說明。 實施形態3中，藉著具備2連續的焊槍的焊接機（半自 動焊接機）執行實施形態2的第6步驟（S6 )。焊接機70， 具有：作業架71 ;作業站72;可自由移動地設置在作業架 7 2的作業臂7 3 ;設置在作業臂7 3的焊槍6 0 a、6 Ob ;對焊槍 6 0a、60b供應預定電流的電源手段（含控制手段。未圖示 );及對焊槍6〇a、60b供應焊接資材（焊絲、惰性氣體等 )的資材供應手段（未圖示）。 第6圖的（a)中，旋轉補強鋼管20使兩側形成有k型 斜切的扁鋼24 (參閱第5圖的（d ))呈水平且位於上側， 載放於作業台7 1。 並且’設置使焊槍前端61a、61b來到形成於扁鋼24兩 側的k型斜切（外側角部）2 6 b、2 8 b的正上方。 因此’並移動作業臂7 3 (焊槍前端6 1 a、6 1 b與補強鋼 管20的軸方向平行一起移動），同時進行外側角部26b、 -17- 201219632 28b的部份熔透焊接。 接著，設置使補強鋼管20逆轉180度使扁鋼22呈水平 且來到上面，以下以同樣的順序，同時進行外側角部2 5b 、27b的部份熔透焊接。 如上述，臨時焊接後的外側角部中，由於同時最終焊 接2處的外側角部進行補強鋼管20的最終焊接，因此可抑 制因焊接熱影響導致鋼管的彎曲或翹曲。 再者，扁鋼24和扁鋼22的焊接順序何者爲先皆可。 並且’本發明不僅限於焊接機70的型式，也可以移動 作業台71來取代作業臂73。或也可將焊槍60a、60b分別設 置在各個的作業臂上。 第6圖的（b )中，在扁鋼2 1的單側、扁鋼23的單側， 並在扁鋼24的兩側分別設置k型斜切，在扁鋼22未施以斜 切的部份是以第6圖的（a)爲準，在各角形成有外側角部 25b、26b、27b、28b > 並且’轉動補強鋼管20使外側角部27b及外側角部28b 彼此成水平且位於上側，載放在作業台7 1上。 因此，設置使焊槍前端6 1 a、6 1 b來到外側角部2 7b、 2 8b的正上方，移動作業臂73 (焊槍前端61a、61b與補強 鋼管20的軸方向平行一起移動），同時進行外側角部27b 、28b的部份熔透焊接。 接著’將補強鋼管20成180度逆轉，設置使外側角部 2 5b、26b彼此成水平且來到上面，以後以同樣的順序，同 時進行外側角部25b、26b的部份熔透焊接。 -18- 201219632 因此可獲得與第6圖的（a)表示的焊接方法相同的效 果。 (實施例） 其次，針對比較實施形態1所涉及鋼管補強撐材（與 藉著實施形態2涉及的鋼管補強撐材的製造方法所製造的 鋼管補強撐材相同，以下有稱「焊接4面箱型」的場合） 的實施例，及將一對鋼板彎曲加工成剖面〈字型，配置該 等包圍著軸材，並將各個端緣彼此焊接形成剖面矩形的補 強鋼管的補強鋼管撐材（以下有稱「〈字型加壓式」）的 比較例之性能的實驗說明如下。 第7圖是說明使用於實驗的試片的圖，（a)爲實施例 的上視圖，（b )爲實施例的側視圖' (c )爲實施例的前 視方向的剖面圖（第7圖的（a )的A-A剖面）、（d )爲比 較例前視方向的剖面圖。 第7圖的（a)〜（c)中，實施例相對於鋼管板厚9mm ，內側塡角焊爲腳長3 mra、外側部份熔透焊接爲斜切角度 45度、斜切深度爲7mm。 第7圖的（d )中，比較例針對軸材剖面形狀、鋼管徑 及板厚都是與實施例相同，但是補強鋼管的製造方法不同 〇 表1是顯示實施例及比較例的各條件與進行等幅承載 試驗的結果。 表1中的「重複次數」是表示作爲鋼管補強撐材之疲 -19- 201219632 勞特性的指標，顯示軸材的最大耐力以後，到耐力降低至 最大耐力的70%爲止的重複次數。又，表1中的「累積塑性 變形倍率」是表示作爲鋼管補強撐材之能量吸收能力的指 標，以到達上述重複次數爲止的滯後曲線（耐力-變形曲 線）的內側面積除以「屈服耐力X屈服變形」的長方形面 積後的値。 表1〕 試片 軸材 補強f 岡管 * :驗結果 鋼種 剖面形狀 鋼種 剖面 形狀 製作方法 重複 次數 累積塑性 變形倍率 實施例 LY225 152Βχ94Ηχ16ι SS400 140¾ 焊接偭箱型 48 2064 比較例 LY225 152βχ94ηχ16' SS400 140Dxg' 〈字型加壓式 45 2240 表1中，對於重複次數，實施例（焊接4面箱型）的一 方若干多於比較例（〈字型加壓式）。 並且，對於累積塑性變形倍率雖然實施例的一方形成 若干低於比較例的値，但是兩者和相當於大地震兩次量的 必要累積塑性變形倍率的「3 00」比較時是形成充分大的 値。並且，兩者的差可謂在誤差的範圍內，因此實施例可 謂和比較例相同，具備充分的性能。 再者，實施例在耐力低於最大耐力的70%之後’也未 見有急遽的耐力降低，最後不會產生鋼管焊接部的斷裂° (變形例） 第8圖及第9圖是模式表示實施形·態2所涉及鋼管補強 -20- 201219632 撐材的製造方法的補強鋼管變化例的圖’第8圖爲前視方 向的剖面圖、第9圖的（a)及（b)爲表示製造步驟的前 視方向的剖面圖、第9圖的（c )是使成品的一部份穿透而 表示的側視圖。再者’與實施形態1相同部份或相當的部 份賦予相同符號’並省略一部份的說明。 第8圖的（a)中，在扁鋼22、24的兩側緣進行倒角（ C倒角）加工，使扁鋼2 1、2 3維持著剖面矩形的狀態（參 閱第2圖）。並且，上述實施形態3說明用的第6圖的（a) 是相當於第8圖的（a )的補強鋼管2 0的例。 第8圖的（b)中，扁鋼21、22、23、24皆在單方的側 緣施以倒角（C倒角）加工。 第8圖的（c )中，扁鋼2 1、2 3是在一方的側緣施以倒 角（C倒角）加工，扁鋼2 4則是在兩側緣施以倒角（C倒角 )加工，扁鋼22則是維持著剖面矩形的狀態。另外，上述 實施形態3說明用的第6圖的（b)是相當於第8圖的（c) 的補強鋼管20的例。 第9圖的（a)中，剖面〈字型的補強構件25、26的側 緣，在長方向隔開3處預定的間隔設置有定位材50a、50b ο 第9圖的（b)及（c)表示的第5步驟中，臨時組裝有 補強鋼管20。此時，定位材50a、50b可容易進行補強構件 25和補強構件26的對位，並且可提高兩者的對接精度，而 可臨時組裝形狀精度高的補強鋼管20。 並且，定位材5 0 a、5 Ob並非補強鋼管2 0的強度構件， -21 - 201219632 因此設置可供定位的程度（例如，點焊等）。再者，定位 材5 0a、50b的數量不加以限定，並且，也可以分別設置於 扁鋼22及扁鋼24來取代扁鋼21及扁鋼23。此外，也可在形 成補強構件2 5、2 6之後（執行塡角焊W 1或部份熔透焊接 W2之後）設置定位材50a、50b，也可使用預先設有定位材 50a、50b的扁鋼21、23形成補強構件25、26。 〔產業上的可利用性〕 根據本發明，由於不須進行扁鋼的彎曲加工，並可抑 制因焊接熱導致鋼管的彎曲或翹曲形成補強鋼管，因此可 廣泛利用於各種形態的撐材的製造方法，及藉該製造方法 所製造的撐材。 【圖式簡單說明】 第1圖是表示本發明實施形態1所涉及的鋼管補強撐材 的上視圖與側視圖。 第2圖是表示本發明實施形態丨所涉及的鋼管補強撐材 的前視方向的剖面圖。 第3圖是說明本發明實施形態2所涉及的鋼管補強撐材 的製造方法的流程圖。 第4圖爲模式表示本發明實施形態2所涉及鋼管補強撐 材的製造方法之各步驟的上視圖、側視圖及前視圖的剖面 圖。 第5圖爲模式表示本發明實施形態2所涉及鋼管補強撐 -22- 201219632 材的製造方法之各步驟的前視方向的剖面圖。 第6圖爲模式表示本發明實施形態3所涉及鋼管補強撐 材的製造方法之第6步驟（S6)的前視方向的剖面圖。 胃7 0是使用於實施例的性能比較實驗的試片的上視 圖及側視圖與前視圖的剖面圖。 第8圖爲模式表示實施形態2所涉及鋼管補強撐材的製 造方法的補強鋼管變化例的前視圖的剖面圖。 第9 Η是表示使模式表示之實施形態2所涉及鋼管補強 撐材的製造方法的補強鋼管變化例的一部份穿透的側視圖 【主要元件符號說明】 I 0 :軸材 II :主軸材 1 2 .副軸材 1 3 _副軸材 2 〇 :補強鋼管 21 :扁鋼 2 2 :扁鋼 2 3 :扁鋼 2 4 :扁鋼 25 :補強構件 25a :內側角部 25b :外側角部 -23- 201219632 26 :補強構件 26a :內側角部 26b :外側角部 2 7 a :內側角隅部 27b :外側角部 2 8 a :內側角隅部 2 8b :外側角部 3 0 :端構件 3 1 :主端構件 3 2 :副端構件 3 3 :副端構件 3 4 :貫穿孔 3 5 :貫穿孔 40 :墊板 5 0 :定位材 70 :焊接機 100 :鋼管補強撐材 B 1 :寬度（主軸材） B 2 :寬度（副軸材） B 3 :寬度（主端構件） B4 :寬度（副端構件） W1 :塡角焊 W2 :部份熔透焊接 W3 :部份溶透焊接 -24 201219632 W4 :部份熔透焊接 W5 :部份熔透焊接 W24 :部份熔透焊接 W35 :部份熔透焊接201219632 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a steel pipe reinforcing struts and a method for producing the same, and more particularly to a steel pipe reinforcing struts disposed on a steel structure such as a building and a method of manufacturing the same. [Prior Art] The steel pipe reinforcing struts provided in the steel structure are inserted into the diagonal line of the reinforcing steel pipe by the flat steel, and the compression force acts on the outer side of the shaft when the compressive force acts (the right angle in the long direction) The deflection of the direction increases the energy absorption capacity. At this time, even if the inner surface of the shaft material and the reinforcing steel pipe slides, in order to prevent the occurrence of friction sound or to reduce the friction, the backing plate is inserted into the gap between the two, or the steel structure is surely disposed in the tube axis direction of the shaft material. The end portion is provided with a wider joint member than the diagonal length of the reinforcing steel pipe (hereinafter referred to as "end member j" °. In addition, it is not possible to insert the bracts, and the degree of freedom of the shape of the end member can be improved. A method for producing a struts (the same as the steel tube reinforcing struts) (for example, see Patent Document 1). '[Prior Art Document] '[Patent Document] [Patent Document 1] Japanese Patent Laid-Open No. 20 (Π-1321 No. 12 ( [Embodiment 3-4] and Fig. 2] [Claim of the Invention] -5-201219632 [Problems to be Solved by the Invention] The method for manufacturing a susceptor disclosed in Patent Document 1 is to bend a pair of steel sheets into a cross-sectional inverse C-shape. Type or profile < font (or may be L-shaped. All of the following), configured to surround the shaft material, and weld the side edges to each other to form a cross-section rectangular reinforcing steel tube. Therefore, the backing plate can be easily Configuration and mention The accuracy of the gap is increased to improve the reinforcing effect. In addition, the shape of the end member can be selected instead of the size of the reinforcing steel pipe, but the following problems are encountered. (a) The reinforcing steel pipe is long in size, and the long-sized flat steel is accurately formed. The bending process must have a high-pressure machine with considerable capacity. Therefore, restrictions on the equipment used in manufacturing will lead to the limitation of the manufacturer (applicator). (b) Reinforced steel pipe formed by bending of flat steel, shaft When the thickness of the outer corner of the reinforced steel pipe is 6 mm or more, the thickness of the flat steel must be 10 or more times, and if it is less than 10 times the thickness of the steel plate, it is necessary to obtain special materials. The Japanese Building Standards Act "H12 Construction 2464 No. 1 No. 8"). Therefore, it is necessary to obtain special materials for the suppression of out-of-plane buckling. Therefore, it is not necessary to perform bending processing and to provide reinforcing steel pipes that can surround the shaft material. The manufacturing method is considered to be a method of assembling four flat steels into an angular shape (hereinafter referred to as "welding four-sided box"). However, a welded 4-sided box is used as the steel pipe. In the case of a reinforcing steel pipe with strong struts, there are the following problems. (c) In the vicinity of the side edge of the main shaft material, the force is applied to the reinforcing steel pipe by the out-of-plane buckling of the main shaft material. -6-201219632 at the corners. When welding is used for the unwelded part of the inner side of the plate thickness, the reinforcing effect is reduced and the starting point of the fracture of the steel pipe is formed. (d) Welding is used for the welding of the corners of the steel pipe. In the case of full penetration welding with a full thickness, there is a need to provide a liner on the inside of the steel pipe (on the inner side of the steel pipe), which is in contact with the shaft or the backing plate, and an appropriate gap cannot be ensured. The present invention is to solve the above problems. The invention provides a method for manufacturing a struts which do not require bending of a flat steel and which can prevent breakage of the steel pipe and can form a reinforcing steel pipe which ensures a proper gap, and the struts which are manufactured by the manufacturing method are purpose. [Means for Solving the Problem] (1) The steel pipe reinforcing struts according to the present invention include: a main shaft material formed of flat steel, and a reinforcing steel pipe for surrounding the outer surface deformation of the main shaft material surrounding the main shaft material, wherein : The above-mentioned reinforcing steel pipe is formed by abutting the side edges of four flat steels by partial penetration welding to form an outer corner portion, and forming a corner portion of the inner side of the steel pipe opposite to the side edge of the main shaft material by meandering welding. rectangle. (2) The above-mentioned (1) is characterized in that a backing plate is disposed in a gap between the inner corner portion after the corner welding of the reinforcing steel pipe and the side edge of the main shaft member. (3) Further, in the above (1) or (2), the side surface of the main shaft member is provided with a sub-shaft member formed of flat steel. (4) In any one of the above (1) to (3), the end portion of the spindle shaft in the axial direction is provided with a flat steel having a length wider than a diagonal of the reinforcing steel pipe of 201219632. End member. (5) A method for producing a steel pipe reinforcing struts according to the present invention, comprising: a main shaft material formed of flat steel; and a reinforcing steel pipe for surrounding the outer surface deformation of the main shaft material surrounding the main shaft material, wherein: The side edges of the flat steel are butt jointed, and the inner corner joint of the fillet weld is finally welded, and the outer corner portion is intermittently welded in the axial direction by partial penetration welding to form a cross-section <shaped reinforcing member; In a state in which the side edge of the main shaft member is opposed to the inner corner portion after the final welding of the reinforcing member, the side edges of the pair of reinforcing members are butted, and the outer corner portion is intermittently in the axial direction by partial penetration welding. Temporary welding, a step of temporarily assembling a rectangular reinforcing steel pipe; and a step of finally assembling the reinforcing steel pipe by partially welding the above-mentioned reinforcing steel pipe after the temporary welding of the outer side corner portion. (6) Further, in the step of finally assembling the reinforcing steel pipe of the above (5), the feature is that the final welding of the two outer corner portions in the outer corner portion after the temporary welding of the reinforcing steel pipe is simultaneously performed. (7) In the above (5) or (6), the step of temporarily assembling the reinforcing steel pipe has a gap between the inner corner portion and the side edge of the main shaft after the final welding of the reinforcing member. The steps to configure the pad. (8) In any one of the above (5) to (7), the side surface of the main shaft member is provided with a sub-shaft member formed of flat steel. (9) In any one of the above (5) to (8), the end portion of the spindle shaft in the axial direction is provided with a flat steel having a length wider than a diagonal line of the reinforcing steel pipe -8 - 201219632. The resulting end member. [Effect of the Invention] (I) The steel pipe reinforcing struts according to the present invention are obtained by butting four side edges of flat steel, forming a lateral corner portion by partial penetration welding, and forming a side edge with the above-mentioned main shaft material by corner welding. The inner corner portion of the opposite steel pipe is formed into a rectangular cross section, and it is not necessary to perform bending processing of the flat steel, and the outer surface buckling of the main shaft material can generate a pressing force from the inner side of the steel pipe to prevent cracking of the reinforcing steel pipe. Further, although the inner corner corner portion of the inner corner portion of the steel pipe which is opposed to the side edge of the main shaft member is not subjected to the fillet welding, the former does not cause the former stress, so that the reinforcing steel pipe does not break. Further, it is not necessary to provide a liner ring on the inner corner surface of the steel pipe opposite to the side edge of the main shaft material, and a proper gap can be secured between the reinforcing steel pipe and the shaft material or the backing plate. (II) Further, a backing plate is disposed in the gap between the inner corner portion of the reinforcing steel pipe and the side edge of the main shaft member, so that the out-of-plane deformation (deflection) of the main shaft member can be correctly restrained, and the friction sound can be obtained even if both are slid. The occurrence of prevention and the reduction of friction. (III) In addition, since the sub-shaft made of flat steel is provided on the side surface of the main shaft material, it is possible to restrain the out-of-plane deformation of the compression force in the axial direction and increase the absorbed energy. (IV) Further, an end member made of a flat steel having a longer length than a diagonal line of the reinforcing steel pipe is provided at the end portion in the direction of the main shaft axis, so that the connection to the steel structure can be surely formed, so that the energy absorption of the main shaft material is achieved. More certain. -9 - 201219632 (V) In addition, the manufacturing method of the steel pipe reinforcing struts according to the present invention has the following method: the inner corner of the inner corner of the fillet is welded to form a final weld, and the outer corner is temporarily welded by a partial penetration weld to form a reinforcement. The step of the component; the step of temporarily welding the outer corner to temporarily assemble the reinforcing steel pipe by partial penetration welding; and the step of finally welding the outer corner to weld the final assembly of the steel pipe by partial penetration welding 'so no need to flatten The bending process of steel can suppress the bending or warping of the steel pipe due to welding heat to form a reinforcing steel pipe. (VI) The semi-automatic welding machine arranged in an array is used to simultaneously perform the final assembly of the reinforcing steel pipe at the two outer corners of the outer corner after the temporary welding of the reinforcing steel pipe. Therefore, the number of times the steel pipe reinforcing struts are rotated during welding can be reduced. , shorten the manufacturing steps. (VII) Further, 'the step of arranging the mat before the temporary assembly of the reinforcing member' can easily perform the configuration of the mat, and the precision can be improved to enhance the reinforcing effect. (VIII) and the auxiliary shaft member formed by the flat steel on the side surface of the above-mentioned main shaft material can restrain the out-of-plane deformation of the compression force in the axial direction, increase the absorption energy 〇 (IX), and the end member does not penetrate through reinforcement during manufacture. The inside of the steel pipe, so the size or shape of the end member is not about the size of the reinforcing steel pipe. Therefore, the end member ' formed of flat steel which is wider than the diagonal length of the reinforcing steel pipe can form a connection to the steel structure, making the energy absorption of the main shaft material more reliable. [Embodiment] -10-201219632 [Embodiment 1] Figs. 1 and 2 are views showing a steel pipe reinforcing struts according to Embodiment 1 of the present invention, and Fig. 1(a) is a top view, and Fig. 1 is a view (b) FIG. 2A is a cross-sectional view in the front view (the XX cross section of FIG. 1(b)). FIG. 2(b) is a part (a) of the second drawing. A cross-sectional view of the front view in an enlarged view. Further, each drawing is shown by a mode, and the relative size, thickness, and the like of each member are not limited by the dimensions shown in the drawings. In addition, in the description of the common part, the description of the added character "a, b" of the symbol is omitted. (Steel tube reinforcing struts) In Fig. 1 and Fig. 2, 'the steel pipe reinforcing struts 1〇〇, including the shaft member 1〇; the reinforcing steel pipe 20 for surrounding the out-of-plane deformation of the main shaft member surrounded by the shaft member 10; The ends of the material 10 in the longitudinal direction are fixed, and the end members (corresponding to the joint members) 30a and 30b for the steel structure (not shown) can be reliably provided: and the side edges and the reinforcing steel pipes disposed on the shaft 1 〇 The backing plate 40a, 40b ° (shaft material) of the inner surface of the inner surface of the 0 0 is composed of: the main shaft material 1 1 ' formed by the flat steel which is shorter than the reinforcing steel pipe 20, and is fixed to the main shaft material 1 1 The secondary shafts i 2 and 13 formed by the flat steel on both sides are formed in a cross-shaped cross section. At this time, the distance between the side edge of the side sub-shaft member 2 and the side edge of the other sub-shaft member 13 (hereinafter referred to as "width B 2") is formed to be smaller than the distance between the side edges of the main-axis material 1 1 ( Hereinafter, it is called "width B j ") (B2 < B1 ). -11 - 201219632 Further, the present invention is not limited to the illustrated form of the shaft member 10, and only the main shaft member 11 to which the sub-shaft members 12 and 13 are not fixed may be used. (Reinforcing Steel Pipe) The reinforcing steel pipe 20 is a tubular shape having a rectangular cross section longer than the shaft member 10, and the side edges of the four flat steels 21, 22, 23, and 24 are welded to each other. That is, the side end face of the flat steel 2 2 on the side of the flat steel 2 1 has a cross section <shaped shape, and the inner corner portion (the abutting portion on the concave side) 25a is a fillet weld W1, and the outer corner portion (butt on the convex side) The part 25b is welded by a partial penetration weld W4 (partially through the weld W24 in the longitudinal direction). Further, the inner corners of the flat steel 23 and the flat steel 24 but also the outer corner portions 26a and the outer corner portions 26b are similarly subjected to the fillet weld W1 and the partial penetration weld W4 (partially penetrated and welded W24 in the longitudinal direction). In addition, the side end surface of the flat steel 24 is butted to the side of the flat steel 2 1 and has a cross section <shaped shape, and the corner portion (the abutting portion on the convex side) 28b is a partially penetration welded W5 (intermittent portion in the long direction) Through-welding W35) to weld the bond. At this time, the corner portion (the abutting portion on the concave side) is not subjected to the fillet welding. Further, since the combination of the flat steel 23 and the flat steel 22 is also the same, the description thereof will be omitted. Further, since the reinforcing steel pipe 20 is formed by the above welding form, there is little bending or warpage, and there is no need for correction. (This will be described in detail in the second embodiment.) (End member) The end members 30a and 30b (hereinafter referred to as "the end member 30 -12 - 201219632") have a length fixed to the main shaft 11 The main end member 31 at the direction end portion and the sub-end members 32 and 33 fixed to the longitudinal end portions of the sub-shaft members 12 and 13. Both side faces of the main end member 31 are fixed with the sub-end members 3 2, 3 3 ' in a cross-sectional shape. At this time, the main end member 31 and the sub-end member 32 are narrowed in the range of the reinforcing steel pipe 20 in the axial direction, and enter the inside of the reinforcing steel pipe 2〇. On the other hand, in the vicinity of the end portion in the axial direction in which the reinforcing steel pipe 20 protrudes, the distance between the side edges of the main end member 31 (hereinafter referred to as "width B3") and the side edge of the sub-end member 32 and the other side are The distance of the side edge of the end member 33 (hereinafter, referred to as "width B4") is sufficiently larger than the length of the diagonal line inside the reinforcing steel pipe 20. Further, in the above description, the main end member 31 and the secondary end member are 3 2 and 33 are formed with through holes 34 and the like which are provided for the bolts for the steel structure, but the present invention is not limited to the form of the drawings. For example, the end portions of the main end member 3 1 and the sub end members 3 2, 3 3 may be welded to the steel structure without providing the through holes 34 and the like. At this time, the steel structure is provided with a gusset having the same end shape as that of the end portions formed by the main end member 31 and the sub-end members 3 2, 3 3 . (Cushion) The backing plate 40 is a gap disposed between the side edge portion of the main shaft member 11 and the inner surface of the reinforcing steel pipe 2, and when the main shaft member 11 is deformed (deflected) out of plane, the deformation of the outer surface deformation is appropriately set. The quantity 'can enhance the reinforcing effect. Further, the side edge portion of the spindle material 和 and the inner surface of the reinforcing steel pipe 20 are butted against the backing plate 4, and do not slide directly from -13 to 201219632, thereby preventing occurrence of friction sound and reduction in friction. Further, the material for forming the backing plate is not limited to a specific material, and may be a hard synthetic resin, natural rubber or artificial rubber. [Embodiment 2] Figs. 3 to 5 are views showing a method of manufacturing a steel pipe reinforcing struts according to a second embodiment of the present invention. Fig. 3 is a flow chart showing each step, and Fig. 4(a) is a mode. The top view of each step is shown, (b) of FIG. 4 is a side view thereof, and (c) of FIG. 4 is a cross-sectional view of the front view direction (XX section of (b) of FIG. 4), FIG. A cross-sectional view showing the forward direction of each step in a mode. The same or equivalent portions as those in the first embodiment are denoted by the same reference numerals, and a part of the description will be omitted. In the third and fourth figures, the manufacturing method of the reinforcing steel pipe struts has: a sub-shaft material 2, 1 3 formed by flat steel is fixed on both side faces of the main shaft material 1 1 made of flat steel, and a section is formed. The first step (S 1 ) of the cross-shaped shaft member 1 , and the second step (S2) of fixing the cross-shaped cross-shaped end members 30a and 30b at both ends of the shaft member 10 are respectively performed. At this time, after the auxiliary end members 32, 3 are respectively fixed on both sides of the main end member 31 to form the cross-shaped cross-shaped end member 30, the main end member 31 is fixed to the main shaft member 1 1 ' 3, 3 3 are fixed to the sub-shafts 1 2, 1 3 ' or the main end member 3 1 can be fixed to the main shaft material 1 1 ' respectively, and the sub-end members 3 2, 3 3 are fixed to the sub-shaft 1 2 . After 1 3', a cross-shaped end member 30 is formed. In addition, it is also possible to fix the secondary end members 3 2, 3 3 and the secondary shaft members 1 2, 1 3 on the joint of the main end member 31 and the main shaft member 11 at the same time, and perform the first step and the second step simultaneously. step. In Figs. 3 and 5(a), reinforcing members 25 and 26 are formed next. That is, the end surface of the flat steel 22 is butted against the side surface of the flat steel 21 to form a cross section <shaped shape, and the final welding of the inner corner portion 25a is performed by the fillet welding W1, and by partial penetration welding W2 The corner portion on the convex surface side (hereinafter referred to as "outer corner portion") 25b is intermittently welded in the axial direction to form a reinforcing member 25 having a cross section <-shaped shape, and the third step (S3) of forming the reinforcing member 26 is similarly formed. Hereinafter, there is a case where the abutting portion is referred to as a "spindle material corner portion". At this time, the both side edges of the flat steel 22 are subjected to chamfering (C chamfering) in advance, so that the outer corner portion forms a bottomed k-shaped chamfer in the middle of the flat thickness of the flat steel 22 (single-blade type chamfering) ). The reinforcing member 26 is also formed for the flat steels 23, 24. Further, the partial penetration weld W2 means that the penetration depth is shallower than the thickness of the flat steel 22, and the weld remaining in the welded portion is intermittently welded and penetrated in the longitudinal direction (longitudinal direction of the reinforcing steel pipe 20). For example, it refers to a 1 or a few layers of ridges each having a length of 50 mm at intervals of 1 m. In Fig. 3 and Fig. 5(b), there is provided a fourth step (S4) of abutting the pads 40a and 40b on both side edges of the main shaft member 1 of the shaft member 10. In Fig. 3 and Fig. 5(c), the reinforcing steel pipe 20 surrounding the shaft member 10 is temporarily assembled. In other words, the side members of the main shaft member 11 of the shaft member 10 are opposed to the inner corner portion of the reinforcing members 25 and 26 through the backing plate 40, and the reinforcing members 25 and 26 surround the shaft member 10, and The side edges of the reinforcing member 25 and the reinforcing member -15-201219632 strong member 26 are mutually abutted (correctly, the side edges of the flat steel 22 and the flat steel 23, the side edges of the flat steel 24 and the flat steel 21 are butted each other), and the outer corner portion is The second step (S5) of reinforcing the steel pipe 20 having a rectangular cross section is temporarily formed by temporarily welding the partial penetration welds W3 in the axial direction by the partial penetration welds W3. At this time, the inner corner portions 27a and 28a forming the abutting portions of the side edges of the reinforcing member 25 and the reinforcing member 26 (hereinafter referred to as "the sub-shaft corner portion") are not welded, and the partial melting is performed. The through-welding W3 is based on the partial penetration welding W2, so that the penetration depth is shallower than the thickness of the flat steels 22 and 24, and the unwelded portion remains in the thickness direction, and is welded intermittently in the longitudinal direction. Therefore, the welding from the outside does not penetrate the inner corner portions 27a, 28a. In Fig. 3 and Fig. 5(d), the reinforcing steel pipe 20 is finally assembled. That is, the outer corner portions 25b and 26b and the outer corner portions 27b and 28b which are executed by the partial penetration welds W2 and W3 are finally welded by partial penetration welding W4 and W5, and finally the reinforcing steel pipe 20 is finally assembled. 6 Step (S6) ° At this time, the partial penetration welding W2 is intermittently performed in the longitudinal direction at the outer corner portions 25b, 26b, and the partial penetration welding W4 may be partially performed to penetrate the partial penetration welding W2. The upper part is penetrated and welded to W24. Similarly, the partial penetration welding W3 is intermittently performed in the longitudinal direction at the outer corner portions 27b, 28b, and partial melting of the partial penetration welding W5 through the partial penetration welding W3 can be partially performed. Through-welding W3 5. As described above, in the method of manufacturing the steel pipe reinforcing struts according to the present invention, the pair of reinforcing members 25 and 26 which temporarily weld the outer corner portions 25b and 26b surround the shaft member 1 in the state in which the end member 30 is fixed, and temporarily weld a pair. After the outer side corner portions 27b and 28b of the reinforcing members 25 -166-1201219632 and 26 are temporarily assembled and reinforced, the final assembly is finally performed while maintaining the rectangular shape, and the bending process of the flat steel 2 1 or the like is not required. Further, it is possible to form the reinforcing steel pipe 20 which suppresses the bending or warping of the flat steel 21 or the like due to the influence of the welding heat at the time of final welding. [Embodiment 3] Fig. 6 is a view for explaining a method of manufacturing a steel pipe reinforcing struts according to Embodiment 3 of the present invention, and a schematic cross-sectional view showing a sixth step (S6) in a front view. The same or equivalent portions as those in the second embodiment are denoted by the same reference numerals, and a part of the description will be omitted. In the third embodiment, the sixth step (S6) of the second embodiment is executed by a welding machine (semi-automatic welding machine) having two continuous welding torches. The welding machine 70 has a work frame 71, a work station 72, a working arm 7 3 that is movably disposed on the work frame 7 2, a welding torch 60a, 6 Ob provided on the work arm 73, and a welding torch 60a, 60b is a power supply means (including a control means, not shown) for supplying a predetermined current; and a supply means (not shown) for supplying a welding material (a welding wire, an inert gas, etc.) to the welding torch 6A, 60b. In Fig. 6(a), the rotary reinforcing steel pipe 20 has a k-shaped chamfered flat steel 24 (see (d) of Fig. 5) which is horizontally placed on the upper side and placed on the work table 71. Further, the welding gun front ends 61a and 61b are placed directly above the k-shaped chamfers (outer corner portions) 2 6 b and 2 8 b formed on both sides of the flat steel 24. Therefore, the working arm 7 3 is moved (the tip ends 6 1 a and 6 1 b of the welding torch are moved in parallel with the axial direction of the reinforcing steel pipe 20), and the partial penetration welding of the outer corner portions 26b and -17-201219632 28b is simultaneously performed. Next, the reinforcing steel pipe 20 is reversely rotated by 180 degrees so that the flat steel 22 is horizontal and comes to the upper surface, and the partial penetration welding of the outer corner portions 25b and 27b is simultaneously performed in the same order. As described above, in the outer corner portion after the temporary welding, since the outer corner portion of the final welding 2 is simultaneously welded to the reinforcing steel pipe 20, the bending or warpage of the steel pipe due to the influence of the welding heat can be suppressed. Furthermore, the welding sequence of the flat steel 24 and the flat steel 22 is the first one. Further, the present invention is not limited to the type of the welding machine 70, and the work table 71 may be moved instead of the working arm 73. Alternatively, the welding torches 60a, 60b may be provided on each of the working arms. In (b) of Fig. 6, on one side of the flat steel 2 1 and one side of the flat steel 23, k-type chamfering is respectively provided on both sides of the flat steel 24, and the flat steel 22 is not obliquely cut. The part is based on (a) of Fig. 6, and the outer corner portions 25b, 26b, 27b, 28b > are formed at the respective corners; and the 'rotating reinforcing steel pipe 20 makes the outer corner portion 27b and the outer corner portion 28b horizontal to each other. It is located on the upper side and is placed on the work table 71. Therefore, it is provided that the welding gun front ends 6 1 a, 6 1 b are directly above the outer corner portions 27b, 28b, and the working arm 73 is moved (the welding gun front ends 61a, 61b move in parallel with the axial direction of the reinforcing steel pipe 20), and at the same time Partial penetration welding of the outer corner portions 27b, 28b is performed. Next, the reinforcing steel pipe 20 is reversed at 180 degrees, and the outer corner portions 25b, 26b are placed horizontally and come to the upper surface, and then the partial penetration welding of the outer corner portions 25b, 26b is performed in the same order. -18-201219632 Therefore, the same effect as the welding method shown in (a) of Fig. 6 can be obtained. (Examples) The steel pipe reinforcing struts according to the first embodiment are the same as those of the steel pipe reinforcing struts manufactured by the method for producing a steel pipe reinforcing struts according to the second embodiment, and the following are referred to as "welding 4 side boxes. Example of the case of the type), and a reinforcing steel pipe rib (hereinafter referred to as a reinforcing steel pipe in which a pair of steel plates are bent into a cross section <-shaped shape, and the shaft members are surrounded and the end edges are welded to each other to form a rectangular cross section. An experimental example of the performance of a comparative example called "<字型压式") is as follows. Fig. 7 is a view for explaining a test piece used in the experiment, (a) is a top view of the embodiment, and (b) is a side view of the embodiment '(c) is a cross-sectional view of the front view of the embodiment (No. 7) The AA cross section (a) of (a) of the figure is a cross-sectional view of the comparative example in the front view direction. In (a) to (c) of Fig. 7, the embodiment is 9 mm thick with respect to the steel pipe, the inner corner fillet is 3 mra, and the outer part is welded to have a chamfer angle of 45 degrees and a bevel depth of 7 mm. . In (d) of Fig. 7, the cross-sectional shape, the diameter of the steel pipe, and the thickness of the comparative example are the same as those of the embodiment, but the manufacturing method of the reinforcing steel pipe is different. Table 1 shows the conditions of the examples and the comparative examples. The results of the equal-width load test were carried out. The "number of repetitions" in Table 1 indicates the number of repetitions until the endurance of the shaft is reduced to the maximum endurance of 70% after the maximum endurance of the shaft is indicated as the index of the fatigue of the steel tube reinforced struts. In addition, the "accumulated plastic deformation ratio" in Table 1 is an index indicating the energy absorption capacity of the steel pipe reinforcing struts, and the inner area of the hysteresis curve (endurance-deformation curve) up to the number of repetitions is divided by the yield endurance X. The 値 of the rectangular area after yielding deformation. Table 1] Test piece shaft reinforcement f Gang tube *: Test result Steel type profile shape Steel type profile shape preparation method Repeat number cumulative plastic deformation magnification Example LY225 152Βχ94Ηχ16ι SS400 1403⁄4 Welded box type 48 2064 Comparative example LY225 152βχ94ηχ16' SS400 140Dxg' Font type pressure type 45 2240 In Table 1, for the number of repetitions, one of the examples (welding four-sided box type) is more than the comparative example (<-type pressure type). Further, in the case of the cumulative plastic deformation magnification, although one of the examples is formed to be smaller than the comparative example, the two are sufficiently large in comparison with the "300" which is equivalent to the required cumulative plastic deformation magnification of the large earthquake. value. Further, the difference between the two can be said to be within the range of the error, and therefore the embodiment can be said to have sufficient performance as in the comparative example. Furthermore, in the embodiment, after the endurance is less than 70% of the maximum endurance, there is no sudden decrease in endurance, and finally the fracture of the welded portion of the steel pipe is not generated. (Modification) Figs. 8 and 9 are modes showing implementation. Fig. 8 is a cross-sectional view in the front view, and (a) and (b) in Fig. 9 shows the manufacturing. Fig. 8 is a cross-sectional view in the front view, and Fig. 9 is a view showing the manufacturing process. The cross-sectional view in the forward direction of the step and (c) in Fig. 9 are side views showing a part of the finished product being penetrated. In addition, the same or equivalent components as in the first embodiment are denoted by the same reference numerals, and a part of the description will be omitted. In Fig. 8(a), chamfering (C chamfering) is performed on both side edges of the flat steels 22 and 24, and the flat steels 2 1 and 2 3 are maintained in a rectangular cross section (refer to Fig. 2). Further, (a) of Fig. 6 for explaining the third embodiment is an example of the reinforcing steel pipe 20 corresponding to (a) of Fig. 8. In (b) of Fig. 8, the flat steels 21, 22, 23, and 24 are all chamfered (C chamfered) on the side edges of the single side. In (c) of Fig. 8, the flat steels 2 1 and 2 3 are chamfered (C chamfered) on one side edge, and the flat steel 24 is chamfered on both side edges (C Angle), flat steel 22 is maintained in a rectangular shape. Further, (b) of Fig. 6 for explaining the third embodiment is an example of the reinforcing steel pipe 20 corresponding to (c) of Fig. 8. In (a) of Fig. 9, the side edges of the reinforcing members 25 and 26 of the cross-section are provided with positioning members 50a and 50b at predetermined intervals spaced apart from each other in the longitudinal direction. (b) and (b) of Fig. 9 In the fifth step indicated by c), the reinforcing steel pipe 20 is temporarily assembled. At this time, the positioning members 50a and 50b can easily perform the alignment of the reinforcing member 25 and the reinforcing member 26, and the docking accuracy of both can be improved, and the reinforcing steel pipe 20 having high shape accuracy can be temporarily assembled. Further, the positioning members 5 0 a, 5 Ob are not the strength members of the reinforcing steel pipe 20, and -21 - 201219632 thus set the degree of positioning (for example, spot welding, etc.). Further, the number of the positioning members 50a, 50b is not limited, and may be provided in the flat steel 22 and the flat steel 24 instead of the flat steel 21 and the flat steel 23. Further, the positioning members 50a, 50b may be provided after the reinforcing members 25, 26 are formed (after the beryll weld W1 or the partial penetration weld W2 is performed), and the flat members 50a, 50b may be used in advance. The steels 21, 23 form reinforcing members 25, 26. [Industrial Applicability] According to the present invention, since it is not necessary to perform bending processing of the flat steel, it is possible to suppress bending or warping of the steel pipe due to welding heat to form a reinforcing steel pipe, and therefore, it can be widely used for various types of struts. a manufacturing method, and a struts manufactured by the manufacturing method. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a top view and a side view showing a steel pipe reinforcing struts according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing the front side of the steel pipe reinforcing struts according to the embodiment of the present invention. Fig. 3 is a flow chart for explaining a method of manufacturing the steel pipe reinforcing struts according to the second embodiment of the present invention. Fig. 4 is a cross-sectional view showing a top view, a side view, and a front view of each step of a method for producing a steel pipe reinforcing struts according to a second embodiment of the present invention. Fig. 5 is a cross-sectional view showing a front view of each step of a method for producing a steel pipe reinforcement -22-201219632 according to a second embodiment of the present invention. Fig. 6 is a cross-sectional view showing a sixth step (S6) of the method for producing a steel pipe reinforcing struts according to a third embodiment of the present invention. The stomach 70 is a top view and a cross-sectional view of a side view and a front view of a test piece used in the performance comparison experiment of the examples. Fig. 8 is a cross-sectional view showing a front view of a modified example of a reinforcing steel pipe in a method of manufacturing a steel pipe reinforcing struts according to a second embodiment. The ninth aspect is a side view showing a part of penetration of a modified example of the reinforcing steel pipe in the method for manufacturing the steel pipe reinforcing struts according to the second embodiment of the mode. [Main component symbol description] I 0 : Shaft material II: Spindle material 1 2 . Secondary shaft 1 3 _ secondary shaft 2 〇: reinforced steel tube 21 : flat steel 2 2 : flat steel 2 3 : flat steel 2 4 : flat steel 25 : reinforcing member 25a : inner corner portion 25b : outer corner portion -23- 201219632 26 : reinforcing member 26a: inner corner portion 26b: outer corner portion 2 7 a : inner corner portion 27b: outer corner portion 2 8 a : inner corner portion 2 8b : outer corner portion 3 0 : end member 3 1 : main end member 3 2 : secondary end member 3 3 : secondary end member 3 4 : through hole 3 5 : through hole 40 : backing plate 50 : positioning material 70 : welding machine 100 : steel tube reinforcing struts B 1 : Width (spindle material) B 2 : Width (sub-shaft) B 3 : Width (main end member) B4 : Width (secondary member) W1 : Corner welding W2 : Partial penetration welding W3 : Partially welded -24 201219632 W4 : Partial penetration welding W5 : Partial penetration welding W24 : Partial penetration welding W35 : Partial penetration welding