JP2007118032A - Method and structure for reinforcing deck plate - Google Patents
Method and structure for reinforcing deck plate Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 22
- 238000003466 welding Methods 0.000 claims abstract description 68
- 230000035515 penetration Effects 0.000 claims abstract description 45
- 239000011324 bead Substances 0.000 claims abstract description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
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- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 241001016380 Reseda luteola Species 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000012779 reinforcing material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000009661 fatigue test Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
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Abstract
Description
本発明は、Uリブ等の閉断面構造のリブで補剛された鋼床版橋梁等における補強技術に関するものである。 The present invention relates to a reinforcing technique for a steel floor slab bridge stiffened by a rib having a closed cross-sectional structure such as a U rib.
Uリブで補剛された鋼床版橋梁等は、鋼床版(デッキプレート)を補強するために、デッキプレートの下面にUリブ等の補強材を溶接することが行われている。これらの補強材は断面形状においては閉じた空間が形成されている(閉断面構造である)ため、剛性は高いが、補強材とデッキプレートとの接合部(補強材の止端部)を溶接する場合には、前記閉断面構造の外部からしか作業できない。すなわち、Uリブにおいては片側のすみ肉溶接または部分溶込み溶接(のど厚はUリブ板厚の75%が要求されている)しか施工ができないため、溶接ルート部が残存し、そこが大きな応力集中部となりこのルート部を起点として部分溶込み溶接ののど厚に沿った疲労クラックおよびデッキプレート母材の橋軸方向に疲労クラックが発生し伝播するものと推定されている(非特許文献1、Fig.1.2〜Fig.1.3)。
In order to reinforce the steel floor slab (deck plate), a steel floor slab bridge stiffened by the U rib is welded with a reinforcing material such as a U rib on the lower surface of the deck plate. Since these reinforcing materials have a closed space in the cross-sectional shape (closed cross-section structure), the rigidity is high, but the joint between the reinforcing material and the deck plate (the toe part of the reinforcing material) is welded. In this case, the work can be performed only from the outside of the closed section structure. In other words, since only U-rib fillet welding or partial penetration welding (the throat thickness is required to be 75% of the thickness of the U-rib plate), the weld root remains and there is significant stress. It is estimated that fatigue cracks along the throat thickness of partial penetration welding and fatigue cracks are generated and propagated in the bridge axis direction of the deck plate base material starting from this root part as a concentrated part (Non-Patent
全国の重交通下にあるUリブで補剛された鋼床版橋梁では、多くの疲労クラックが発生しており、重大な問題となりつつある。
また、発明者等は、既に、特願2005-200495において、従来の溶接技術では困難であったすみ肉溶接の裏波溶接を大電流パルスMAG溶接電源の適用によって可能とする技術を提案した。
Steel floor slab bridges stiffened with U-ribs under heavy traffic throughout the country are experiencing many fatigue cracks and are becoming serious problems.
In addition, the inventors have already proposed in Japanese Patent Application No. 2005-200495 a technology that enables back-wall welding of fillet welding, which was difficult with conventional welding technology, by applying a high-current pulse MAG welding power source.
そこで、本発明では、特願2005-200495において既に提案した大電流パルスMAG溶接方法を用いて、Uリブ等の閉断面構造の補強材とデッキプレートとの溶接を完全溶け込み溶接とする技術を提案し、溶接部分における疲労強度の向上を図る発明を提案するものである。 In view of this, the present invention proposes a technique in which welding of a reinforcing member having a closed cross-sectional structure such as a U-rib and a deck plate is completely penetration welded using the large current pulse MAG welding method already proposed in Japanese Patent Application 2005-200495. The present invention proposes an invention for improving the fatigue strength at the welded portion.
本発明にかかる請求項1のデッキプレートの補強方法は、
閉断面構造のリブをデッキプレートに溶接することによって前記デッキプレートを補強するデッキプレートの補強方法において、
前記リブの止端部と前記デッキプレートとは裏波完全溶け込み溶接方法によって溶接することを特徴としている。
請求項2において、前記裏波完全溶け込み溶接方法は、
裏はつり不要なI形開先、レ形開先またはK形開先を有するリブの止端部を大電流パルスMAGによるガウジングレス完全溶込み溶接方法を用いる。
請求項3いおいて、前記大電流パルスMAGによるガウジングレス完全溶込み溶接方法は、下記の条件(1)〜(10)を満足する溶接方法である。
(1)溶接入熱量は1,500〜5,000J/mm
(2)裏ビード脚長は1.5〜6.0mm
(3)最適溶接電流は、
板厚が約20mmの場合には390±25Aの範囲、
板厚が約17mmの場合には360±25Aの範囲、
板厚が約12mmの場合には320±25Aの範囲、
板厚が約9mmの場合には310±25Aの範囲、
板厚が約6mmの場合には360±25Aの範囲、
板厚が約3.2mmの場合には300±25Aの範囲、
(4)最適溶接速度は40±10cpmの範囲
(5)最適パルスピーク電圧は40〜55Vの範囲
(6)最適パルス周波数は、約300〜400Hzの範囲
(7)最適パルス幅は1.0〜1.5msの範囲
(8)最適なワイヤの狙い位置はルートから水平手前に0〜+1mm且つ上方向に0〜+1mmの範囲
(9)最適移動角は、板厚が9mm〜20mmの場合には後退角20°に対して前進角側に0〜+5°の範囲で、板厚が9mm未満の場合には後退角0±10°の範囲
(10)最適シールドガス流量は20〜25L/minの範囲
請求項4では、リブの止端部の板厚を3〜20mmとする。
請求項5のデッキプレートの補強構造においては、
前記リブの止端部と前記デッキプレートとは、裏波完全溶け込み溶接方法によって溶接されている。
請求項6において前記裏波完全溶け込み溶接方法は、大電流パルスMAGによるガウジングレス完全溶込み溶接方法が用いられている。
The deck plate reinforcing method according to
In the deck plate reinforcement method of reinforcing the deck plate by welding a rib having a closed cross-sectional structure to the deck plate,
The toe end of the rib and the deck plate are welded by a reverse wave complete penetration welding method.
In
A gouging-less full penetration welding method using a high-current pulse MAG is used for the toe portion of a rib having an I-shaped groove, a ledge-shaped groove, or a K-shaped groove that does not require a backside.
In
(1) Weld heat input is 1,500 to 5,000 J / mm
(2) Back bead leg length is 1.5-6.0mm
(3) The optimum welding current is
When the plate thickness is about 20mm, the range is 390 ± 25A.
When the plate thickness is about 17mm, the range is 360 ± 25A.
When the plate thickness is about 12mm, the range is 320 ± 25A.
When the plate thickness is about 9mm, the range is 310 ± 25A.
When the plate thickness is about 6mm, the range is 360 ± 25A.
When the plate thickness is about 3.2mm, the range is 300 ± 25A.
(4) Optimal welding speed is in the range of 40 ± 10 cpm (5) Optimal pulse peak voltage is in the range of 40 to 55 V (6) Optimal pulse frequency is in the range of about 300 to 400 Hz (7) Optimal pulse width is in the range of 1.0 to 1.5 ms (8) The optimum wire aiming position is 0 to +1 mm horizontally from the root and 0 to +1 mm upward. (9) The optimum moving angle is a receding angle of 20 mm when the plate thickness is 9 mm to 20 mm. In the range of 0 to + 5 ° on the advancing angle side with respect to ° and the plate thickness is less than 9 mm, the range of the receding angle of 0 ± 10 ° (10) The optimal shielding gas flow rate is in the range of 20 to 25 L / min. 4, the thickness of the toe portion of the rib is 3 to 20 mm.
In the reinforcing structure of the deck plate according to claim 5,
The toe portion of the rib and the deck plate are welded by a reverse wave complete penetration welding method.
In the sixth aspect of the present invention, the gougeless full penetration welding method using a large current pulse MAG is used as the reverse wave full penetration welding method.
本発明による効果をFEM(有限要素法)解析によって検討した結果、部分溶込み溶接の場合のルート部の応力は約100MPaと非常に大きいが、これを完全溶込み裏波とすると、応力集中部は当然ルート部ではなくなり、溶接止端部で60MPa程度に減少することが示された。従って、疲労寿命は(100/60)の3乗=4.6倍程度に延伸されることが期待でき、疲労強度が大幅に改善される。
As a result of examining the effect of the present invention by FEM (finite element method) analysis, the stress of the root part in the case of partial penetration welding is very large as about 100 MPa. Of course, it was shown that it is no longer the root part and decreases to about 60 MPa at the weld toe. Therefore, it can be expected that the fatigue life is extended to the cube of (100/60) = 4.6 times, and the fatigue strength is greatly improved.
以下に、本発明にかかるデッキプレートの補強方法を、その実施の形態を示した図面に基づいて詳細に説明する。
本発明のデッキプレートの補強方法は、閉断面構造のリブをデッキプレートに溶接することによって前記デッキプレートを補強するデッキプレートの補強方法において、前記リブの止端部(デッキプレートと突き合わされて溶接される端部)と前記デッキプレートとは裏波完全溶け込み溶接方法によって溶接することを特徴としている。
Below, the reinforcement method of the deck plate concerning this invention is demonstrated in detail based on drawing which showed the embodiment.
The deck plate reinforcing method of the present invention is a deck plate reinforcing method in which a rib having a closed cross-sectional structure is welded to the deck plate to reinforce the deck plate. The end plate) and the deck plate are welded by a reverse wave full penetration welding method.
そして、前記裏波完全溶け込み溶接方法としては、裏はつり不要なI形開先、レ形開先またはK形開先を有するリブの止端部を大電流パルスMAGによるガウジングレス完全溶込み溶接方法を用いることが好ましい。 As the reverse wave complete penetration welding method, a gouging-less complete penetration welding method using a high-current pulse MAG is applied to the toe portion of a rib having an I-shaped groove, a ledge-shaped groove, or a K-shaped groove, which does not require a back surface. Is preferably used.
さらに、前記大電流パルスMAGによるガウジングレス完全溶込み溶接方法は、下記の条件(1)〜(10)を満足する溶接方法であることが好ましい。
(1)溶接入熱量は1,500〜5,000J/mm
(2)裏ビード脚長は1.5〜6.0mm
(3)最適溶接電流は、
板厚が約20mmの場合には390±25Aの範囲、
板厚が約17mmの場合には360±25Aの範囲、
板厚が約12mmの場合には320±25Aの範囲、
板厚が約9mmの場合には310±25Aの範囲、
板厚が約6mmの場合には360±25Aの範囲、
板厚が約3.2mmの場合には300±25Aの範囲、
(4)最適溶接速度は40±10cpmの範囲
(5)最適パルスピーク電圧は40〜55Vの範囲
(6)最適パルス周波数は、約300〜400Hzの範囲
(7)最適パルス幅は1.0〜1.5msの範囲
(8)最適なワイヤの狙い位置はルートから水平手前に0〜+1mm且つ上方向に0〜+1mmの範囲
(9)最適移動角は、板厚が9mm〜20mmの場合には後退角20°に対して前進角側に0〜+5°の範囲で、板厚が9mm未満の場合には後退角0±10°の範囲
(10)最適シールドガス流量は20〜25L/minの範囲
また、前記リブの止端部の板厚は3〜20mmとする。
Furthermore, it is preferable that the gouging-less complete penetration welding method using the high-current pulse MAG is a welding method that satisfies the following conditions (1) to (10).
(1) Weld heat input is 1,500 to 5,000 J / mm
(2) Back bead leg length is 1.5-6.0mm
(3) The optimum welding current is
When the plate thickness is about 20mm, the range is 390 ± 25A.
When the plate thickness is about 17mm, the range is 360 ± 25A.
When the plate thickness is about 12mm, the range is 320 ± 25A.
When the plate thickness is about 9mm, the range is 310 ± 25A.
When the plate thickness is about 6mm, the range is 360 ± 25A.
When the plate thickness is about 3.2mm, the range is 300 ± 25A.
(4) Optimal welding speed is in the range of 40 ± 10 cpm (5) Optimal pulse peak voltage is in the range of 40 to 55 V (6) Optimal pulse frequency is in the range of about 300 to 400 Hz (7) Optimal pulse width is in the range of 1.0 to 1.5 ms (8) The optimum wire aiming position is 0 to +1 mm horizontally from the root and 0 to +1 mm upward. (9) The optimum moving angle is a receding angle of 20 mm when the plate thickness is 9 mm to 20 mm. In the range of 0 to + 5 ° on the advancing angle side with respect to °, and in the case where the plate thickness is less than 9 mm, the range of receding angle 0 ± 10 ° (10) The optimal shielding gas flow rate is in the range of 20 to 25 L / min. The plate thickness of the toe portion of the rib is 3 to 20 mm.
以上のようにして補強されたデッキプレートの補強構造は、前記リブの止端部と前記デッキプレートとは、裏波完全溶け込み溶接方法によって溶接され、前記裏波完全溶け込み溶接方法には、大電流パルスMAGによるガウジングレス完全溶込み溶接方法を用いることができる。
なお、リブとしては、閉断面構造であればよく、Uリブに限定されるものではない。
The reinforcing structure of the deck plate reinforced as described above is such that the toe portion of the rib and the deck plate are welded by a reverse wave full penetration welding method, and the reverse wave full penetration welding method includes a large current. A gouging-less complete penetration welding method using pulse MAG can be used.
In addition, as a rib, what is necessary is just a closed cross-section structure, and it is not limited to a U rib.
ここでは、以下の解析モデルを設定して、溶接部分における応力の分布状況をFEM(有限要素法)解析によって検討する。
本解析に用いる小型試験体形状図を図1に示す。
図1の(a)は平面図、(b)は正面図、(c)は側面図である。
Here, the following analysis model is set, and the stress distribution in the welded part is examined by FEM (finite element method) analysis.
Fig. 1 shows the shape of a small test specimen used in this analysis.
1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a side view.
各図において、
1は板厚12mmのデッキプレート、2は320×240×6-40のUリブである。そして、前記デッキプレート1の下面に前記Uリブ2が溶接された形状である。前記Uリブ2は、溶接時の状態では閉断面構造となっているので、内側から溶接することはできない。そのため、外側から完全溶け込み溶接方法によって溶接するのである。
3は直径20mm程度の円筒面でデッキプレート1を支持する支持治具であり、負荷治具4で繰り返し負荷をかけて疲労試験のFEM解析を行う。
解析では、Uリブを中心として600mm幅でデッキプレートを単純支持し、Uリブ中央部に強制変位1mm載荷した。
材質は、弾性係数2.0×105N/mm2、ポアソン比0.3の鋼材を模した値とし、溶接金属も同じ特性値とした。
In each figure,
1 is a deck plate having a thickness of 12 mm, and 2 is a U-rib of 320 × 240 × 6-40. The
A
In the analysis, the deck plate was simply supported with a width of 600 mm around the U rib, and a forced displacement of 1 mm was loaded at the center of the U rib.
The material was a value imitating a steel material having an elastic modulus of 2.0 × 105 N /
また、今回の追加解析で考慮した溶接形状を図2に示す。
ここで検討する解析モデルは以下の5種類である。
図2の(a)に示した解析モデルA:75%部分溶け込み溶接モデル
このモデルは、止端部の厚み6mmの内の75%の4.5mmまでの部分溶け込み溶接モデルである。
図2の(b)に示した解析モデルB:完全溶け込み溶接1
このモデルは、止端部の厚み6mmの100%の部分溶け込み溶接モデルである。
図2の(c)に示した解析モデルC:完全溶け込み溶接2
このモデルは、裏波が4mm完全溶け込み溶接モデルである。裏波の表面は平面状とした。
図2の(d)に示した解析モデルD:完全溶け込み溶接2#1
このモデルは、裏波が4mm完全溶け込み溶接モデルである。裏波の表面は1mmの凸面状とした。
図2の(e)に示した解析モデルE:完全溶け込み溶接2#2
このモデルは、裏波が4mm完全溶け込み溶接モデルである。裏波の表面は1mmの凹面状とした。
Moreover, the welding shape considered in this additional analysis is shown in FIG.
The analysis models examined here are the following five types.
Analytical model A shown in FIG. 2 (a): 75% partial penetration welding model This model is a partial penetration welding model up to 4.5mm, which is 75% of the 6mm thickness of the toe.
Analytical model B shown in FIG. 2 (b):
This model is a 100% partial penetration welding model with a thickness of 6 mm at the toe.
Analytical model C shown in FIG. 2 (c):
This model is a full penetration welding model with a back wave of 4 mm. The surface of the back wave was flat.
Analytical model D shown in FIG. 2 (d):
This model is a full penetration welding model with a back wave of 4 mm. The surface of the back wave was 1 mm convex.
Analytical model E shown in Fig. 2 (e):
This model is a full penetration welding model with a back wave of 4 mm. The surface of the back wave was 1 mm concave.
以下に、各解析モデルにおける検討結果を示す。
1)75%部分溶け込み溶接(解析モデルA)
解析モデルAでの要素分割の状態を図3に示す。解析モデルAは対称性を考慮して1/4をモデル化した。要素分割は、デッキプレート、Uリブとも板厚方向は6分割とした。
解析モデルAの解析結果を図4に示す。図では板幅端部の断面のvon Mises 相当応力分布をコンター図で示している。図および解析結果より、以下のことがわかる。
・デッキプレート、Uリブとも曲げ応力が卓越している。
・裏側止端部に応力集中がみられる。
・デッキプレートの板曲げ40N/mm2程度。裏側止端部の応力集中100N/mm2程度。載荷荷重4.65kN。載荷点変移1mm。
解析モデルAの主応力ベクトル図を図5に示す。図より、裏側止端部に大きな引張応力が発生していることがわかる。
The results of examinations for each analysis model are shown below.
1) 75% partial penetration welding (analysis model A)
The state of element division in the analysis model A is shown in FIG. Analytical model A was modeled as 1/4 considering symmetry. The element division was set to 6 divisions in the thickness direction for both the deck plate and the U rib.
The analysis result of the analysis model A is shown in FIG. In the figure, the von Mises equivalent stress distribution in the cross section at the plate width end is shown in a contour diagram. From the figure and analysis results, the following can be understood.
・ Bending stress is outstanding for both deck plate and U-rib.
・ Stress concentration is observed at the back end.
・ Deck plate bending about 40N / mm2. Stress concentration at the back side toe is about 100 N / mm2. Loading load 4.65kN. Loading point shift 1mm.
The principal stress vector diagram of the analysis model A is shown in FIG. From the figure, it can be seen that a large tensile stress is generated at the back side toe.
2)完全溶け込み溶接1(解析モデルB)
解析モデルBでの要素分割の状態を図6に示す。基本的な要素分割は解析モデルAと同じである。
解析モデルBの解析結果を図7に示す。図では板幅中央部の断面のvon Mises 相当応力分布をコンター図で示している。図および解析結果より、以下のことがわかる。
・表側止端部の応力集中の方が裏側止端部より大きい。
・デッキプレートの板曲げ40N/mm2程度。表側止端部の応力集中60N/mm2程度。載荷荷重4.68kN。載荷点変移1mm。
解析モデルBの主応力ベクトル図を図8に示す。図より、表側止端部に大きな引張応力が発生していることがわかる。
2) Complete penetration welding 1 (analysis model B)
The state of element division in the analysis model B is shown in FIG. Basic element division is the same as analysis model A.
The analysis result of the analysis model B is shown in FIG. In the figure, the von Mises equivalent stress distribution in the cross section at the center of the plate width is shown in a contour diagram. From the figure and analysis results, the following can be understood.
・ The stress concentration at the front side toe is larger than that at the back side.
・ Deck plate bending about 40N / mm2. Stress concentration at the front side toe is about 60 N / mm2. Loading load 4.68kN. Loading point shift 1mm.
A principal stress vector diagram of the analysis model B is shown in FIG. From the figure, it can be seen that a large tensile stress is generated at the front side toe portion.
3)完全溶け込み溶接2(解析モデルC)
解析モデルCでの要素分割の状態を図9に示す。要素は1辺の最大寸法0.25mmで要素分割されている。基本的な要素分割は解析モデルAと同じである。
解析モデルCの解析結果を図10に示す。図では板幅中央部の断面のvon Mises 相当応力分布をコンター図で示している。図および解析結果より、以下のことがわかる。
・表側止端部の応力集中の方が裏側止端部より大きい。
・デッキプレートの板曲げ40N/mm2程度。表側止端部の応力集中60N/mm2程度。載荷荷重4.69kN。載荷点変移1mm。
解析モデルCの主応力ベクトル図を図11に示す。図より、表側止端部に大きな圧縮応力が発生していることがわかる。
3) Complete penetration welding 2 (analysis model C)
The state of element division in the analysis model C is shown in FIG. The element is divided into elements with a maximum dimension of 0.25mm on one side. Basic element division is the same as analysis model A.
The analysis result of the analysis model C is shown in FIG. In the figure, the von Mises equivalent stress distribution in the cross section at the center of the plate width is shown in a contour diagram. From the figure and analysis results, the following can be understood.
・ The stress concentration at the front side toe is larger than that at the back side.
・ Deck plate bending about 40N / mm2. Stress concentration at the front side toe is about 60 N / mm2. Loading load 4.69kN. Loading point shift 1mm.
A principal stress vector diagram of the analysis model C is shown in FIG. From the figure, it can be seen that a large compressive stress is generated at the front side toe portion.
4)完全溶込み溶接2#1(解析モデルD)
解析モデルDの要素分割の状況を図12に示し、解析結果を図13に示す。図より、裏ビード形状が凸形状となっていることから応力集中が見られている。
4)
FIG. 12 shows the element division status of the analysis model D, and FIG. 13 shows the analysis result. From the figure, stress concentration is seen because the back bead shape is convex.
5)完全溶込み溶接2#2(解析モデルE)
解析モデルEの要素分割の状態を図14に示し、解析結果を図15に示す。図より、裏ビード形状が凹形状となっていることから、応力集中が減少していることがわかる。
5)
FIG. 14 shows the element division state of the analysis model E, and FIG. 15 shows the analysis result. From the figure, it can be seen that the stress concentration is reduced because the back bead shape is concave.
本発明のデッキプレートの補強方法、補強構造は、橋梁等のデッキプレートにかぎらず、種々の構造物の補強構造に応用することができる。
The deck plate reinforcing method and reinforcing structure of the present invention are not limited to deck plates such as bridges, and can be applied to reinforcing structures of various structures.
1 デッキプレート、鋼床版
2 Uリブ、閉断面構造のリブ
3 支持治具
4 負荷治具
1 Deck plate, steel floor slab 2 U rib, rib with
Claims (6)
前記リブの止端部と前記デッキプレートとは裏波完全溶け込み溶接方法によって溶接することを特徴とするデッキプレートの補強方法。 In the deck plate reinforcement method of reinforcing the deck plate by welding a rib having a closed cross-sectional structure to the deck plate,
A reinforcing method of a deck plate, wherein the toe portion of the rib and the deck plate are welded by a reverse wave complete penetration welding method.
裏はつり不要なI形開先、レ形開先またはK形開先を有するリブの止端部を大電流パルスMAGによるガウジングレス完全溶込み溶接方法を用いることを特徴とする請求項1に記載のデッキプレートの補強方法。 The reverse wave complete penetration welding method is:
2. The gouging-less full penetration welding method using a high-current pulse MAG is used for the toe portion of a rib having an I-shaped groove, a re-shaped groove, or a K-shaped groove, which does not require a back side. Reinforcement method of the deck plate.
(1)溶接入熱量は1,500〜5,000J/mm
(2)裏ビード脚長は1.5〜6.0mm
(3)最適溶接電流は、
板厚が約20mmの場合には390±25Aの範囲、
板厚が約17mmの場合には360±25Aの範囲、
板厚が約12mmの場合には320±25Aの範囲、
板厚が約9mmの場合には310±25Aの範囲、
板厚が約6mmの場合には360±25Aの範囲、
板厚が約3.2mmの場合には300±25Aの範囲、
(4)最適溶接速度は40±10cpmの範囲
(5)最適パルスピーク電圧は40〜55Vの範囲
(6)最適パルス周波数は、約300〜400Hzの範囲
(7)最適パルス幅は1.0〜1.5msの範囲
(8)最適なワイヤの狙い位置はルートから水平手前に0〜+1mm且つ上方向に0〜+1mmの範囲
(9)最適移動角は、板厚が9mm〜20mmの場合には後退角20°に対して前進角側に0〜+5°の範囲で、板厚が9mm未満の場合には後退角0±10°の範囲
(10)最適シールドガス流量は20〜25L/minの範囲 The deck plate reinforcing method according to claim 2, wherein the gouging-less complete penetration welding method using the large current pulse MAG is a welding method that satisfies the following conditions (1) to (10).
(1) Weld heat input is 1,500 to 5,000 J / mm
(2) Back bead leg length is 1.5-6.0mm
(3) The optimum welding current is
When the plate thickness is about 20mm, the range is 390 ± 25A.
When the plate thickness is about 17mm, the range is 360 ± 25A.
When the plate thickness is about 12mm, the range is 320 ± 25A.
When the plate thickness is about 9mm, the range is 310 ± 25A.
When the plate thickness is about 6mm, the range is 360 ± 25A.
When the plate thickness is about 3.2mm, the range is 300 ± 25A.
(4) Optimal welding speed is in the range of 40 ± 10 cpm (5) Optimal pulse peak voltage is in the range of 40 to 55 V (6) Optimal pulse frequency is in the range of about 300 to 400 Hz (7) Optimal pulse width is in the range of 1.0 to 1.5 ms (8) The optimum wire aiming position is 0 to +1 mm horizontally from the root and 0 to +1 mm upward. (9) The optimum moving angle is a receding angle of 20 mm when the plate thickness is 9 mm to 20 mm. In the range of 0 to + 5 ° on the advancing angle side with respect to °, and when the plate thickness is less than 9 mm, the range of receding angle 0 ± 10 ° (10) The optimum shielding gas flow rate is in the range of 20 to 25 L / min
前記リブの止端部と前記デッキプレートとは、裏波完全溶け込み溶接方法によって溶接されていることを特徴とするデッキプレートの補強構造。 In the reinforcing structure of the deck plate that is reinforced by welding the rib of the closed cross-sectional structure to the deck plate,
The reinforcing structure of the deck plate, wherein the toe portion of the rib and the deck plate are welded by a reverse wave complete penetration welding method.
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| JP2005312975A JP2007118032A (en) | 2005-10-27 | 2005-10-27 | Method and structure for reinforcing deck plate |
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| JP2005312975A JP2007118032A (en) | 2005-10-27 | 2005-10-27 | Method and structure for reinforcing deck plate |
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| JP2010046682A (en) * | 2008-08-20 | 2010-03-04 | Ihi Corp | Weld joint structure, structure provided with the same weld joint structure and steel deck plate |
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| WO2022082982A1 (en) * | 2020-10-23 | 2022-04-28 | 中铁山桥集团有限公司 | Butt-welding method for u-shaped stainless steel rib with drainage function |
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