JP2003001476A - Steel column base part and reinforcing method therefor - Google Patents
Steel column base part and reinforcing method thereforInfo
- Publication number
- JP2003001476A JP2003001476A JP2001184435A JP2001184435A JP2003001476A JP 2003001476 A JP2003001476 A JP 2003001476A JP 2001184435 A JP2001184435 A JP 2001184435A JP 2001184435 A JP2001184435 A JP 2001184435A JP 2003001476 A JP2003001476 A JP 2003001476A
- Authority
- JP
- Japan
- Prior art keywords
- rib
- steel pipe
- pipe column
- base
- inverted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Road Signs Or Road Markings (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば道路照明用
ポールや道路標識用ポール等の鋼管柱を、道路等の躯体
に固定するための鋼管柱基部及び鋼管柱基部の強化方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe column base for fixing a steel pipe column such as a road lighting pole or a road marking pole to a frame such as a road and a method for strengthening the steel pipe column base. .
【０００２】[0002]
【従来の技術】道路照明用ポールや道路標識用ポール等
の鋼管柱をコンクリート等からなる躯体に固定するため
の鋼管柱基部としては、図７に示すように鋼管柱１０の
下端部にベースプレート１１を溶接するとともに、鋼管
柱１０とベースプレート１１との間を複数のリブ１２に
より補強した構造が一般的である。各リブ１２は上端部
が斜めになった平板状の三角リブであり、各リブ１２は
鋼管柱１０にＴ字溶接されている。そしてベースプレー
ト１１をアンカーボルト１３を用いて躯体に固定するこ
とにより、鋼管柱１０を垂直に支持している。2. Description of the Related Art As a steel pipe column base for fixing a steel pipe column such as a road lighting pole or a road marking pole to a frame made of concrete or the like, a base plate 11 is provided at the lower end of a steel pipe column 10 as shown in FIG. In general, a structure in which the steel pipe column 10 and the base plate 11 are reinforced by a plurality of ribs 12 is welded together. Each rib 12 is a flat plate-shaped triangular rib having an inclined upper end, and each rib 12 is T-welded to the steel pipe column 10. Then, the base plate 11 is fixed to the body using the anchor bolts 13 to vertically support the steel pipe column 10.
【０００３】しかし上記のような従来の鋼管柱基部は、
風や交通振動などを受けて鋼管柱１０に曲げモーメント
が作用したとき、リブ１２の上端部１４である溶接止端
部付近に大きい応力集中が生じ、繰返し応力によりこの
部分の強度が低下するおそれがあった。また、リブ１２
の上端部１４の回し溶接部が溶接熱による引張り残留応
力と熱影響部材質劣化との重複により構造欠陥となりや
すく、耐力や疲労特性が低下するという問題があった。However, the conventional steel pipe column base as described above is
When a bending moment acts on the steel pipe column 10 due to wind or traffic vibration, a large stress concentration occurs near the weld toe, which is the upper end portion 14 of the rib 12, and the strength of this portion may decrease due to repeated stress. was there. Also, the rib 12
There is a problem that the turn welded portion of the upper end portion 14 of Fig. 3 is likely to be a structural defect due to overlap of tensile residual stress due to welding heat and deterioration of heat-affected member material, resulting in deterioration of proof strength and fatigue characteristics.
【０００４】このような問題は構造部材に補強用のリブ
をＴ字溶接した構造体に共通するものであって、日本鋼
構造協会「鋼構造物の疲労設計指針・同解説」でも、ガ
セットをすみ肉溶接した継手が鋼部材の耐力や疲労特性
を低下させるので、設計に配慮するように指摘されてい
る。Such a problem is common to a structure in which reinforcing ribs are T-welded to a structural member, and the gusset is also described in "Guideline for Fatigue Design of Steel Structures-Commentary" of the Japan Steel Structural Association. It has been pointed out that design considerations should be taken because fillet welded joints reduce the yield strength and fatigue properties of steel members.
【０００５】本発明は上記した従来の問題点を解決し、
鋼管柱に繰返し曲げモーメントが作用した場合において
も、リブの溶接止端部の強度低下を抑制することがで
き、またリブの上端部の回し溶接部の耐力や疲労性能の
低下を防止することができる鋼管柱基部及び鋼管柱基部
の強化方法を提供するためになされたものである。The present invention solves the above-mentioned conventional problems,
Even when a bending moment is repeatedly applied to the steel pipe column, it is possible to suppress the strength reduction of the weld toe of the rib, and prevent the deterioration of the yield strength and fatigue performance of the turn welded portion of the upper end of the rib. The purpose of the present invention is to provide a steel pipe column base and a method for strengthening the steel pipe column base.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明の鋼管柱基部は、鋼管柱の基部をＴ
字溶接されたリブにより補強した鋼管柱基部であって、
前記のリブは上端部が屈曲された逆Ｕ字状または逆Ｖ字
状のリブであり、かつリブの溶接止端部に超音波振動に
よるピーニング処理が施されたものであることを特徴と
するものである。また本発明の鋼管柱基部の強化方法
は、鋼管柱の基部に上端部が屈曲された逆Ｕ字状または
逆Ｖ字状のリブをＴ字溶接したのち、各リブの溶接止端
部に超音波振動によるピーニング処理を施すことを特徴
とするものである。The steel pipe column base of the present invention made in order to solve the above-mentioned problems has a base portion of the steel pipe column which is T-shaped.
A steel pipe column base reinforced by a welded rib,
The above-mentioned rib is an inverted U-shaped or inverted V-shaped rib having an upper end bent, and the weld toe of the rib is peened by ultrasonic vibration. It is a thing. Further, the method of strengthening a steel pipe column base of the present invention is such that an inverted U-shaped or inverted V-shaped rib whose upper end is bent is T-welded to the base of the steel pipe column, and then the welded toe of each rib is superfluous. It is characterized in that peening processing is performed by means of sound wave vibration.
【０００７】なお、処理区間の母材に鋼管軸方向の引張
応力が作用するような荷重を鋼管柱の基部に与えた状態
で、超音波振動によるピーニング処理を施すことによ
り、さらに強化効果を高めることができる。超音波振動
によるピーニング処理の好ましい条件は、振幅２０〜５
０μｍ、振動数１０〜５０ｋＨｚの範囲である。The strengthening effect is further enhanced by subjecting the base material of the steel pipe pillar to a peening treatment by ultrasonic vibration while applying a load to the base material of the treatment section such that tensile stress in the axial direction of the steel pipe acts. be able to. A preferable condition of the peening treatment by ultrasonic vibration is an amplitude of 20 to 5
The range is 0 μm and the frequency is 10 to 50 kHz.
【０００８】上記のように本発明では、溶接止端部とな
る上端部が屈曲された逆Ｕ字状または逆Ｖ字状のリブを
使用することにより、リブ上端部を鋼管柱の主応力方向
から直角方向になるまで逃がし、リブ上端部の剛性を低
下させている。この結果、鋼管柱に曲げ応力が作用した
場合に溶接止端部に生じる応力集中が大幅に緩和され、
また溶接熱による引張り残留応力をも大幅に緩和するこ
とができる。As described above, according to the present invention, by using the inverted U-shaped or inverted V-shaped rib whose upper end portion serving as the weld toe portion is bent, the upper end portion of the rib is set in the main stress direction of the steel pipe column. To the right angle to reduce the rigidity of the rib upper end. As a result, the stress concentration that occurs at the weld toe when bending stress acts on the steel pipe column is greatly reduced,
Further, the tensile residual stress due to welding heat can be relieved significantly.
【０００９】さらに本発明では、リブの溶接止端部に超
音波振動によるピーニング処理を施した。この処理は超
音波により棒状工具を軸方向に振動させ、その先端を処
理対象となる金属表面にあてがうことによって表面を窪
ませる方法である。この結果、溶接止端部に高密度のエ
ネルギが与えられて塑性変形が生じ、圧縮残留応力が付
与される。このため鋼管柱基部の弱点であった溶接止端
部がさらに強化され、鋼管柱に繰返し曲げモーメントが
作用した場合においても、リブの溶接止端部の強度低下
を抑制することができるとともに、リブの上端部の回し
溶接部の耐力や疲労性能の低下を防止することができ
る。Further, in the present invention, the weld toe of the rib is subjected to peening treatment by ultrasonic vibration. This treatment is a method in which the rod-shaped tool is vibrated in the axial direction by ultrasonic waves, and the tip is applied to the metal surface to be treated to make the surface indented. As a result, high density energy is applied to the weld toe to cause plastic deformation, and compressive residual stress is applied. For this reason, the weld toe, which was the weak point of the steel pipe column base, is further strengthened, and even when a repeated bending moment acts on the steel pipe column, it is possible to suppress the strength reduction of the weld toe part of the rib and It is possible to prevent deterioration of the yield strength and fatigue performance of the turn welded portion at the upper end of the.
【００１０】[0010]
【発明の実施の形態】以下に本発明の好ましい実施形態
を示す。図１において、１０は道路照明用ポールや道路
標識用ポール等として用いられる鋼管柱、１１はこの鋼
管柱１０の下端部に溶接されたベースプレート、１２は
鋼管柱１０とベースプレート１１との間を補強するため
にＴ字溶接された複数枚のリブである。この実施形態で
はリブ１２は逆Ｕ字状であるが、図２に示す他の実施形
態のように逆Ｖ字状のリブ１２としてもよい。ベースプ
レート１１はアンカーボルト１３により道路等の躯体に
固定され、鋼管柱１０を垂直に保持している。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention are shown below. In FIG. 1, 10 is a steel pipe column used as a pole for road lighting or a pole for road markings, 11 is a base plate welded to the lower end of the steel pipe column 12, and 12 is a reinforcement between the steel pipe column 10 and the base plate 11. It is a plurality of ribs welded in a T shape in order to do so. In this embodiment, the rib 12 has an inverted U shape, but the rib 12 may have an inverted V shape as in the other embodiment shown in FIG. The base plate 11 is fixed to a frame such as a road by anchor bolts 13 and holds the steel pipe column 10 vertically.
【００１１】鋼管柱１０の主応力方向は上下方向であ
り、リブ１２も全体としては鋼管柱１０の主応力方向に
延びている。しかしリブ１２の上部は円弧状に緩和屈曲
され、溶接止端部となるリブ１２の上端部１４は鋼管柱
１０の主応力方向に対して直角になるまで屈曲されてい
る。The principal stress direction of the steel tube column 10 is the vertical direction, and the rib 12 also extends in the principal stress direction of the steel tube column 10 as a whole. However, the upper portions of the ribs 12 are gently bent in an arc shape, and the upper ends 14 of the ribs 12 serving as weld toes are bent until they are perpendicular to the main stress direction of the steel pipe column 10.
【００１２】このようにリブ１２の上端部１４を鋼管柱
１０の主応力方向から逃げる方向に緩和屈曲させること
により、リブ１２の上端部１４を低剛性構造とすること
ができる。その結果、リブ１２の上端部１４における応
力集中が緩和されるとともに、溶接部の溶接残留熱応力
も大幅に緩和され、溶接構造体としての耐力や疲労性能
が大幅に向上する。As described above, the upper end portion 14 of the rib 12 can be made to have a low rigidity structure by gently bending the upper end portion 14 of the rib 12 in a direction away from the principal stress direction of the steel pipe column 10. As a result, the stress concentration at the upper ends 14 of the ribs 12 is alleviated, and the residual welding heat stress of the welded portion is significantly alleviated, so that the yield strength and fatigue performance of the welded structure are greatly improved.
【００１３】このような効果を十分に発揮させるために
は、リブ１２の上端部１４の曲率半径をリブ１２の肉厚
の３倍以上としておくことが好ましい。曲率半径がこれ
よりも小さくなると、リブ１２を屈曲させる際に材質劣
化が生じ易くなり、また剛性を低下させる効果も小さく
なる。In order to sufficiently bring out such an effect, it is preferable that the radius of curvature of the upper end portion 14 of the rib 12 is three times or more the wall thickness of the rib 12. If the radius of curvature is smaller than this, material deterioration is likely to occur when the rib 12 is bent, and the effect of lowering rigidity is also reduced.
【００１４】参考のために、図１に示す鋼管柱基部と図
７に示す従来の鋼管柱基部とをＦＥＭ解析した応力集中
図を、図３、図４として示す。これらの図は、鋼管柱１
０の上端に等しい水平荷重を与えたときのリブ１２の周
辺の発生応力分布を等高線によって示したものであり、
図中の単位はＭＰａである。図３と図４を対比すれば明
らかなように、リブ１２の上端部１４を屈曲させること
により、集中応力の最大値は従来構造に比較して半減す
ることが分かる。For reference, stress concentration diagrams obtained by FEM analysis of the steel pipe column base shown in FIG. 1 and the conventional steel pipe column base shown in FIG. 7 are shown in FIGS. 3 and 4. These figures are for steel pipe column 1
The stress distribution around the rib 12 when a horizontal load equal to the upper end of 0 is applied is shown by contour lines,
The unit in the figure is MPa. As is clear from comparison between FIG. 3 and FIG. 4, by bending the upper end portion 14 of the rib 12, the maximum value of the concentrated stress is halved compared with the conventional structure.
【００１５】しかも本発明においては、屈曲されたリブ
１２の溶接止端部にさらに超音波振動によるピーニング
処理が施される。ピーニング処理部２０は図１中に拡大
して示したように、リブ１２の中心線の両側の中心角α
の領域であり、一般的には３０°≦α≦６０°の範囲と
すればよい。図１ではαはほぼ４５°である。Moreover, in the present invention, the welded toe of the bent rib 12 is further subjected to peening treatment by ultrasonic vibration. As shown in the enlarged view of FIG. 1, the peening processing unit 20 has center angles α on both sides of the center line of the rib 12.
The range of 30 ° ≦ α ≦ 60 ° may be generally set. In FIG. 1, α is approximately 45 °.
【００１６】この超音波振動によるピーニング処理は、
図５に示されるように超音波打撃装置２１の棒状工具２
２の先端を処理対象となる金属表面に当てて軸方向に超
音波振動させ、処理対象部分に打撃を与え表面を窪ませ
る方法である。棒状工具２２の先端は一般的に断面円形
であり、その直径は１〜６ｍｍ程度が好ましい。直径が
１ｍｍ未満では強度が不足して十分な打撃を与えること
ができず、直径が６ｍｍを超えると質量が大きくなるた
めに超音波振動を行なわせ難くなるためである。The peening process using this ultrasonic vibration is
As shown in FIG. 5, the rod-shaped tool 2 of the ultrasonic impacting device 21.
In this method, the tip of No. 2 is applied to the metal surface to be treated, ultrasonically vibrated in the axial direction, and the portion to be treated is hit to make the surface depressed. The tip of the rod-shaped tool 22 is generally circular in cross section, and its diameter is preferably about 1 to 6 mm. This is because if the diameter is less than 1 mm, the strength is insufficient to give a sufficient impact, and if the diameter exceeds 6 mm, the mass becomes large and it becomes difficult to perform ultrasonic vibration.
【００１７】棒状工具２２の振動数は１０〜５０ｋＨ
ｚ、振幅は２０〜５０μｍが望ましい。これは、鋼材に
与えられる打撃のエネルギーがこの周波数の領域で効率
よく大きくなることによる。また振幅が２０μｍ未満で
は十分な打撃を与えることができない一方、振幅が５０
μｍを超えると、鋼材に入る塑性変形が大きくなり過ぎ
ることがあり、好ましくない。The vibration frequency of the rod-shaped tool 22 is 10 to 50 kHz.
The z and the amplitude are preferably 20 to 50 μm. This is because the energy of impact given to the steel material increases efficiently in this frequency region. If the amplitude is less than 20 μm, sufficient impact cannot be given, while the amplitude is 50
If it exceeds μm, the plastic deformation into the steel material may become too large, which is not preferable.
【００１８】上記のような条件で処理された金属表面
は、高密度のエネルギにより塑性変形を生じて０．１〜
０．５ｍｍ程度の深さに凹み、表層から１０ｍｍ以上の
深さまで引張応力を導入することができる。また表層か
ら１００μｍ程度の深さまで金属組織に大きな変化を生
じてホワイトレイヤーと呼ばれる組織層が形成され、良
好な耐食性、耐磨耗性、摩擦抵抗の低減を図ることがで
きる。The metal surface treated under the above conditions undergoes plastic deformation due to high-density energy, and is 0.1 to 0.1
It can be recessed to a depth of about 0.5 mm and tensile stress can be introduced from the surface layer to a depth of 10 mm or more. Further, a large change occurs in the metal structure from the surface layer to a depth of about 100 μm to form a structure layer called a white layer, and good corrosion resistance, abrasion resistance, and friction resistance can be reduced.
【００１９】本発明ではこのような超音波振動によるピ
ーニング処理部２０を、図１、図２に示されるように各
リブ１２の溶接止端部に形成する。この結果、溶接止端
部の応力集中が緩和されるとともに、溶接止端部に引張
応力が導入され、疲労強度が飛躍的に向上する。また前
記したようにリブ１２の溶接止端部は溶接熱による引張
り残留応力と熱影響部材質劣化との重複により構造欠陥
となり易い部分であるが、超音波振動によるピーニング
処理により組織変化を生じさせることによって、微細な
クラックなどの構造欠陥をも修復することができる効果
がある。In the present invention, the peening processing portion 20 by such ultrasonic vibration is formed at the weld toe portion of each rib 12 as shown in FIGS. As a result, the stress concentration at the weld toe is alleviated, and tensile stress is introduced into the weld toe, resulting in a dramatic improvement in fatigue strength. Further, as described above, the weld toe portion of the rib 12 is a portion which is apt to be a structural defect due to overlap of tensile residual stress due to welding heat and deterioration of heat-affected member material, but a structural change is caused by peening treatment by ultrasonic vibration. This has the effect of repairing structural defects such as fine cracks.
【００２０】このように本発明の方法の鋼管柱基部は、
上端部１４が屈曲された逆Ｕ字状または逆Ｖ字状のリブ
１２の溶接止端部に超音波振動によるピーニング処理を
施したものであるから、それぞれの構成による効果が組
み合わされる。その結果、風や振動などによって鋼管柱
１０に曲げモーメントが作用したときにリブ１２の溶接
止端部付近に生ずる応力集中を大幅に緩和することがで
き、また後記する実施例のデータに示されるように、こ
の部分の疲労強度を著しく向上させることができる。し
かも本発明は超音波打撃装置２１以外の付帯設備を必要
とせず、現場においても容易に施工できる利点がある。Thus, the steel pipe column base of the method of the present invention is
Since the welded toe of the rib 12 having an inverted U-shape or an inverted V-shape in which the upper end 14 is bent is subjected to peening treatment by ultrasonic vibration, the effects of the respective configurations are combined. As a result, when a bending moment acts on the steel pipe column 10 due to wind or vibration, the stress concentration generated near the weld toe of the rib 12 can be relieved significantly, and it will be shown in the data of Examples described later. As described above, the fatigue strength of this portion can be significantly improved. Moreover, the present invention does not require any auxiliary equipment other than the ultrasonic impacting device 21, and has an advantage that it can be easily installed on site.
【００２１】なお、通常は鋼管柱１０の基部に溶接され
た各リブ１２の溶接止端部に超音波打撃装置２１の棒状
工具２２の先端を当ててピーニング処理を施せばよい
が、処理区間の母材に鋼管軸方向の引張応力が作用する
ような荷重（例えば曲げ荷重）を鋼管柱基部に与えた状
態で、超音波振動によるピーニング処理を施すこともで
きる。このように外力を加えて引張応力を作用させた状
態でピーニング処理を施して溶接止端部に圧縮応力を与
えれば、外力を取り除くとさらに大きい圧縮応力を溶接
止端部１４に残留させることが可能となる。このため一
段と優れた補強効果を得ることができるようになる。[0021] Normally, the tip of the rod-shaped tool 22 of the ultrasonic striking device 21 may be applied to the weld toe of each rib 12 welded to the base of the steel pipe column 10 for peening treatment. It is also possible to perform peening treatment by ultrasonic vibration in a state where a load (for example, a bending load) such that tensile stress in the axial direction of the steel pipe acts on the base material is applied to the steel pipe column base. Thus, if a peening treatment is applied in a state where a tensile stress is applied by applying an external force to give a compressive stress to the welding toe portion, a larger compressive stress may remain in the welding toe portion 14 when the external force is removed. It will be possible. For this reason, it becomes possible to obtain a more excellent reinforcing effect.
【００２２】以上の説明では各リブ１２の溶接止端部の
みに超音波振動によるピーニング処理を施したが、その
他の溶接部にもピーニング処理を施しても差し支えない
ことはもちろんである。しかしリブ１２の下方部分等は
鋼管柱基部の疲労強度を直接左右する部分ではないた
め、あまり実益はないと考えられる。In the above description, only the weld toe of each rib 12 is subjected to peening treatment by ultrasonic vibration, but it goes without saying that other welded portions may be subjected to peening treatment. However, since the lower portion of the rib 12 does not directly affect the fatigue strength of the steel pipe column base, it is considered to be of little practical benefit.
【００２３】[0023]
【実施例】図１に示す本発明の鋼管柱基部に試験機によ
り繰返し曲げ応力を加え、疲労強度試験を行なった。使
用した材料は鋼管、リブともにＳＭ４９０である。また
比較のために、図７に示す構造の鋼管基部リブ廻りの部
分試験片に繰返し引張り応力を加える疲労強度試験を行
なった。その結果、図６に黒丸で示すように図７に示す
従来構造の疲労特性は、鉄道橋設計示方書の設計寿命曲
線のＥ等級〜Ｄ等級に相当するものであった。これに対
して本発明品の疲労特性は、白丸で示すように設計寿命
曲線のＡ等級にまで大幅に上昇した。なお、先端工具の
振幅は４０μｍであり、振動数は３０ｋＨｚとした。EXAMPLE A fatigue strength test was carried out by repeatedly applying bending stress to the steel pipe column base of the present invention shown in FIG. The material used was SM490 for both steel pipes and ribs. For comparison, a fatigue strength test in which a tensile stress was repeatedly applied to a partial test piece around the steel pipe base rib having the structure shown in FIG. 7 was conducted. As a result, as shown by the black circles in FIG. 6, the fatigue characteristics of the conventional structure shown in FIG. 7 corresponded to grades E to D of the design life curve of the railway bridge design specifications. On the other hand, the fatigue characteristics of the product of the present invention significantly increased to the A grade of the design life curve as shown by the white circles. The amplitude of the tip tool was 40 μm and the frequency was 30 kHz.
【００２４】さらに引張応力が作用する荷重を鋼管柱基
部に与えた状態で、超音波振動によるピーニング処理を
施した場合には、その疲労特性は白三角で示すように設
計寿命曲線のＡ等級以上にまで上昇した。なお、図６中
に示される右上向きの矢印は、その時点で試験体に変化
が見られなかったので、載荷を終了したことを意味する
ものである。ここで本試験に使用した従来構造の部分試
験片の溶接品質は非常にグレードの高いものであり、通
常の工業製品レベルでは疲労寿命が若干低くなるはずで
ある。Further, when the steel pipe column base is subjected to a load exerted by tensile stress and subjected to peening treatment by ultrasonic vibration, the fatigue characteristics thereof are A grade or more of the design life curve as shown by white triangles. Rose to. The arrow pointing to the upper right in FIG. 6 means that the loading of the test specimen was completed because no change was observed in the test specimen at that time. Here, the welding quality of the partial test piece of the conventional structure used in this test is very high grade, and the fatigue life should be slightly lower at the level of ordinary industrial products.
【００２５】[0025]
【発明の効果】以上に説明したように、本発明によれば
上端部が屈曲された逆Ｕ字状または逆Ｖ字状のリブの溶
接止端部に超音波振動によるピーニング処理を施すこと
により、リブ上端の回し溶接部の耐力や疲労性能の低下
を大幅に防止することができる。その結果、鋼管柱に繰
返し曲げモーメントが作用した場合においてもリブの溶
接止端部付近の強度低下がなく、長期間にわたり使用し
ても安全上の問題がない。しかも本発明は鋼管柱基部の
構造を変える必要がないため、既存の設備に対しても容
易に適用できる利点がある。As described above, according to the present invention, the welding toe of the inverted U-shaped or inverted V-shaped rib having the bent upper end is subjected to the peening treatment by ultrasonic vibration. It is possible to largely prevent deterioration of the proof strength and fatigue performance of the turn welded portion at the upper end of the rib. As a result, even when a bending moment is repeatedly applied to the steel pipe column, there is no reduction in strength near the weld toe of the rib, and there is no safety problem even when used for a long period of time. Moreover, since the present invention does not need to change the structure of the steel pipe column base, it has an advantage that it can be easily applied to existing equipment.
【図１】本発明の第１の実施形態を示す正面図である。FIG. 1 is a front view showing a first embodiment of the present invention.
【図２】本発明の第２の実施形態を示す斜視図である。FIG. 2 is a perspective view showing a second embodiment of the present invention.
【図３】逆Ｕ字状のリブを用いた鋼管柱基部をＦＥＭ解
析した応力集中図である。FIG. 3 is a stress concentration diagram obtained by FEM analysis of a steel pipe column base using an inverted U-shaped rib.
【図４】従来構造の鋼管柱基部をＦＥＭ解析した応力集
中図である。FIG. 4 is a stress concentration diagram obtained by FEM analysis of a steel pipe column base having a conventional structure.
【図５】超音波打撃装置の側面図である。FIG. 5 is a side view of the ultrasonic impacting device.
【図６】実施例における疲労強度試験の結果を示すＳ-
Ｎ曲線である。FIG. 6 is an S- showing the results of a fatigue strength test in Examples.
It is an N curve.
【図７】従来例を示す斜視図である。FIG. 7 is a perspective view showing a conventional example.
１０ 鋼管柱 １１ ベースプレート １２ リブ １３ アンカーボルト １４ 上端部 ２０ ピーニング処理部 ２１ 超音波打撃装置 ２２ 棒状工具 10 steel pipe columns 11 base plate 12 ribs 13 Anchor bolt 14 Upper end 20 Peening processor 21 Ultrasonic striking device 22 Bar tool
フロントページの続き (72)発明者 近藤 哲己 東京都千代田区大手町２−６−３ 新日本 製鐵株式会社内 Ｆターム(参考） 2D064 AA11 AA22 BA01 BA19 CA04 DB03 Continued front page (72) Inventor Tetsumi Kondo 2-6-3 Otemachi, Chiyoda-ku, Tokyo New Japan Steelmaking Co., Ltd. F term (reference) 2D064 AA11 AA22 BA01 BA19 CA04 DB03
Claims (4)
り補強した鋼管柱基部であって、前記のリブは上端部が
屈曲された逆Ｕ字状または逆Ｖ字状のリブであり、かつ
リブの溶接止端部に超音波振動によるピーニング処理が
施されたものであることを特徴とする鋼管柱基部。1. A steel pipe column base part in which a base part of the steel pipe column is reinforced by a T-welded rib, wherein the rib is a reverse U-shaped or inverted V-shaped rib with an upper end bent. The steel pipe column base is characterized in that the weld toe of the rib is peened by ultrasonic vibration.
字状または逆Ｖ字状のリブをＴ字溶接したのち、各リブ
の溶接止端部に超音波振動によるピーニング処理を施す
ことを特徴とする鋼管柱基部の強化方法。2. An inverted U having an upper end bent at the base of a steel pipe column.
A method for strengthening a steel pipe column base, which comprises performing T-welding on a rib having a V-shape or an inverted V-shape, and then subjecting a weld toe of each rib to peening treatment by ultrasonic vibration.
が作用するような荷重を鋼管柱の基部に与えた状態で、
超音波振動によるピーニング処理を施すことを特徴とす
る鋼管柱基部の強化方法。3. A base material of the steel pipe column is subjected to a load such that tensile stress in the axial direction of the steel pipe acts on the base material of the treatment section,
A method for strengthening a steel pipe column base characterized by performing peening treatment by ultrasonic vibration.
ｋＨｚの条件下で超音波振動によるピーニング処理を施
すことを特徴とする請求項２または３に記載の鋼管柱基
部の強化方法。4. An amplitude of 20 to 50 μm and a frequency of 10 to 50
The steel pipe column base strengthening method according to claim 2 or 3, wherein a peening treatment by ultrasonic vibration is performed under a condition of kHz.
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| JP2001184435A JP4537621B2 (en) | 2001-06-19 | 2001-06-19 | Steel tube column base and method for strengthening steel tube column base |
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| JP2001184435A JP4537621B2 (en) | 2001-06-19 | 2001-06-19 | Steel tube column base and method for strengthening steel tube column base |
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| JP4537621B2 JP4537621B2 (en) | 2010-09-01 |
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|---|---|---|---|
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Cited By (6)
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| WO2004033144A1 (en) * | 2002-10-08 | 2004-04-22 | Nippon Steel Corporation | Boxing joint with excellent fatigue strength, method of manufacturing the boxing joint, and welded structure |
| US7182543B2 (en) | 2003-07-22 | 2007-02-27 | Nippon Steel Corporation | Joining structure |
| EP1775391A1 (en) * | 2004-07-15 | 2007-04-18 | Nippon Steel Corporation | Boom/arm member for construction machine, having high welded portion fatigue strength, and method of improving the fatigue strength |
| JP2007283369A (en) * | 2006-04-18 | 2007-11-01 | Nippon Steel Corp | Method for improving fatigability of fillet welded zone |
| KR100939406B1 (en) | 2007-10-31 | 2010-01-28 | 구희정 | Reinforce rib |
| CN113802913A (en) * | 2021-09-18 | 2021-12-17 | 国网安徽省电力有限公司经济技术研究院 | Power transmission and transformation double-steel-pipe tower connecting node reinforcing structure and installation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004033144A1 (en) * | 2002-10-08 | 2004-04-22 | Nippon Steel Corporation | Boxing joint with excellent fatigue strength, method of manufacturing the boxing joint, and welded structure |
| US7695825B2 (en) | 2002-10-08 | 2010-04-13 | Nippon Steel Corporation | Circularly welded joint featuring excellent fatigue strength, method of producing circularly welded joint and welded structure |
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| EP1775391A1 (en) * | 2004-07-15 | 2007-04-18 | Nippon Steel Corporation | Boom/arm member for construction machine, having high welded portion fatigue strength, and method of improving the fatigue strength |
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| JP2007283369A (en) * | 2006-04-18 | 2007-11-01 | Nippon Steel Corp | Method for improving fatigability of fillet welded zone |
| KR100939406B1 (en) | 2007-10-31 | 2010-01-28 | 구희정 | Reinforce rib |
| CN113802913A (en) * | 2021-09-18 | 2021-12-17 | 国网安徽省电力有限公司经济技术研究院 | Power transmission and transformation double-steel-pipe tower connecting node reinforcing structure and installation method thereof |
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