Tokyo Gate Bridge
をテンプレートにして作成
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開始行:
*Tokyo Gate Bridge [#g447b1e9]
*東京ゲートブリッジ[#g447b1e9]
**1.Field of application [#u117486c]
>Tokyo Gate Bridge in Tokyo, Japan.&br;
>東京ゲートブリッジ（東京都）
**2.Circumstances of Repair [#od37398f]
>The large block of the bridge(Length=113.3m,weight=2500t) was assembled at the fabricator of the order receiver.Then the large block was carried by a barge.Finaly the large block was erected by large block erection method.The transport by sea was carried out from Sakae in Osaka to Ichihara in Chiba from May 11th to May 13th 2010.The circumstances of towing is shown in [[Fig.1>#fig1]].The projecting length of the block from the barge was 22.5m,and the cantilever length from the support point of the block to top of it was 38.5m.
>
>ファブリケーターのヤードで大ブロック（長さ113.3m、重量2500t）に地組され、バージで現場へ輸送し大ブロック架設を行った。2010年5月11日～13日に大阪府堺市から千葉県市原市へ海上輸送を行った。[[図.1>#fig1]]に曳航の状況を示す。大ブロックのバージからの突出長は22.5mで、支持点からの片持ち長は38.5mであった。
CENTER:&aname(fig1);&attachref(./Tokyo_Gate_Bridge_4.jpg,50%);
&br;
CENTER:Fig.1 The circumstances of towing &br;
CENTER:図.1 曳航の状況&br;
**3.Types of structure [#ve3f5184]
>The outline of the bridge structure is as follows.
>橋梁の構造諸元は次のとおりである。
-Bridge length : 760.0m
-Span length : 160.0 + 440.0 + 160.0 m
-Structure : Tree spans continuous composite truss-box bridge
-Structural steel : SBHS
-橋長：760.0m
-支間長：160+440+160m
-橋梁形式：3径間連続合成箱断面トラス橋
-使用鋼材：SBHS
>Photograph of Tokyo Gate Bridge is shown in [[Fig.2>#fig2]].
>[[Fig.2>#fig2]]に東京ゲートブリッジの写真を示す。
CENTER:&aname(fig2);&attachref(./Tokyo_Gate_Bridge_1.jpg,50%);
&br;
CENTER:Fig.2 Tokyo Gate Bridge (Photograph by Wikipedia)&br;
CENTER:図.2 東京ゲートブリッジ (Photograph by Wikipedia)&br;
**4.Details of loading [#q1562a36]
>Repeated loads of waves while the large block was carried by a barge.
>バージによる大ブロック海上輸送時の波力による繰り返し荷重
**5.Description of damage [#m4455f24]
>The deformed parts were found by inspection when the barge arrived in Ichihara on May 13th at 15:00.Then the visual inspection was carried out over 7:00 on the next morning from 16:00 of the day.[[Fig.3>#fig3]] shows the placement of the diaphragms in the box of the truss girder.The damages due to buckling and the peeling of coating were found in the diagonal members and the bottom lateral ribs at R92,R93 and R94([[Fig.4>#fig4]]).Under the assumption that detailed investigation and examining repair method were carried out after the large block was erected,it was erected on schedule at May 16th 2010.
The visual inspection was carried out for all of the large bolck from May 24th 2010.The most important failures which were found by the inspection were some fatigue cracks.The fatigue cracks which were found at R92 and R93 were found in the welded joints of bottom lateral rib and lower flange and the welded joints of bottom lateral rib and longitudinal rib([[Fig.5>#fig5]]).The fatigue cracks were generated from the both sides of toes of the boxing welded joints of the tips of the members.The fatigue cracks developed and coalesced into the penetrating cracks.The fracture surfaces of the fatigue cracks were flat,but they showed the aspect that a dimple was crushed.Therefore,those cracks were regarded as a fatigue crack by the repetition of high stress.
&br;
>5月13日15:00にバージが市原に到着した際の点検により、部分的に変形が生じていることが確認された。その後、翌朝7：00まで目視点検が行われた。[[図.3>#fig3]]に箱断面トラス桁のダイヤフラム配置を示す。R92、R93、R94の位置で斜材と下側横リブに座屈と塗膜剥離が見つかった([[図.4>#fig4]])。
&br;
CENTER:&aname(fig3);&attachref(./Tokyo_Gate_Bridge_5.jpg,40%);&br;
&br;
CENTER:Fig.3 The placement of the diaphragms in the box of the truss girder(In Japanese).
&br;
&br;
CENTER:&aname(fig4);&attachref(./Tokyo_Gate_Bridge_6.jpg,50%);&br;
&br;
CENTER:Fig.4 The buckling of the bottom lateral rib and diagonal members.
&br;
CENTER:&aname(fig5);&attachref(./Tokyo_Gate_Bridge_7.jpg,50%);&br;
CENTER: (a) (b)
&br;
CENTER:Fig.5 The fatigue cracks which were found at R92.((a):The fatigue crack at the welded joint of bottom lateral rib and longitudinal rib.(b):The fatigue crack at the welded joint of bottom lateral rib and lower flange.)
&br;
**6.Repair method applied [#nbeaff9c]
>The damaged block which was from J32 to J34 was replaced to new block.The damaged block was removed at Jan 9th 2011,and the new block was erected at Jan 23th 2011([[Fig.6>#fig6]]).
&br;
CENTER:&aname(fig6);&attachref(./Tokyo_Gate_Bridge_8.jpg,50%);&br;
CENTER: (a) (b)
&br;
CENTER:Fig.6 Replacement of the damaged block((a):Removal of the damaged block.(b):Erection of the new block.)
&br;
**Reference [#g233bbdd]
>Chitoshi Miki:The damage of the truss girder that occurred during marine transportation,'''Journal of the Japan Society of Civil Engineers''',vol.97,No.4.April.2012(In Japanese)
&br;
終了行:
*Tokyo Gate Bridge [#g447b1e9]
*東京ゲートブリッジ[#g447b1e9]
**1.Field of application [#u117486c]
>Tokyo Gate Bridge in Tokyo, Japan.&br;
>東京ゲートブリッジ（東京都）
**2.Circumstances of Repair [#od37398f]
>The large block of the bridge(Length=113.3m,weight=2500t) was assembled at the fabricator of the order receiver.Then the large block was carried by a barge.Finaly the large block was erected by large block erection method.The transport by sea was carried out from Sakae in Osaka to Ichihara in Chiba from May 11th to May 13th 2010.The circumstances of towing is shown in [[Fig.1>#fig1]].The projecting length of the block from the barge was 22.5m,and the cantilever length from the support point of the block to top of it was 38.5m.
>
>ファブリケーターのヤードで大ブロック（長さ113.3m、重量2500t）に地組され、バージで現場へ輸送し大ブロック架設を行った。2010年5月11日～13日に大阪府堺市から千葉県市原市へ海上輸送を行った。[[図.1>#fig1]]に曳航の状況を示す。大ブロックのバージからの突出長は22.5mで、支持点からの片持ち長は38.5mであった。
CENTER:&aname(fig1);&attachref(./Tokyo_Gate_Bridge_4.jpg,50%);
&br;
CENTER:Fig.1 The circumstances of towing &br;
CENTER:図.1 曳航の状況&br;
**3.Types of structure [#ve3f5184]
>The outline of the bridge structure is as follows.
>橋梁の構造諸元は次のとおりである。
-Bridge length : 760.0m
-Span length : 160.0 + 440.0 + 160.0 m
-Structure : Tree spans continuous composite truss-box bridge
-Structural steel : SBHS
-橋長：760.0m
-支間長：160+440+160m
-橋梁形式：3径間連続合成箱断面トラス橋
-使用鋼材：SBHS
>Photograph of Tokyo Gate Bridge is shown in [[Fig.2>#fig2]].
>[[Fig.2>#fig2]]に東京ゲートブリッジの写真を示す。
CENTER:&aname(fig2);&attachref(./Tokyo_Gate_Bridge_1.jpg,50%);
&br;
CENTER:Fig.2 Tokyo Gate Bridge (Photograph by Wikipedia)&br;
CENTER:図.2 東京ゲートブリッジ (Photograph by Wikipedia)&br;
**4.Details of loading [#q1562a36]
>Repeated loads of waves while the large block was carried by a barge.
>バージによる大ブロック海上輸送時の波力による繰り返し荷重
**5.Description of damage [#m4455f24]
>The deformed parts were found by inspection when the barge arrived in Ichihara on May 13th at 15:00.Then the visual inspection was carried out over 7:00 on the next morning from 16:00 of the day.[[Fig.3>#fig3]] shows the placement of the diaphragms in the box of the truss girder.The damages due to buckling and the peeling of coating were found in the diagonal members and the bottom lateral ribs at R92,R93 and R94([[Fig.4>#fig4]]).Under the assumption that detailed investigation and examining repair method were carried out after the large block was erected,it was erected on schedule at May 16th 2010.
The visual inspection was carried out for all of the large bolck from May 24th 2010.The most important failures which were found by the inspection were some fatigue cracks.The fatigue cracks which were found at R92 and R93 were found in the welded joints of bottom lateral rib and lower flange and the welded joints of bottom lateral rib and longitudinal rib([[Fig.5>#fig5]]).The fatigue cracks were generated from the both sides of toes of the boxing welded joints of the tips of the members.The fatigue cracks developed and coalesced into the penetrating cracks.The fracture surfaces of the fatigue cracks were flat,but they showed the aspect that a dimple was crushed.Therefore,those cracks were regarded as a fatigue crack by the repetition of high stress.
&br;
>5月13日15:00にバージが市原に到着した際の点検により、部分的に変形が生じていることが確認された。その後、翌朝7：00まで目視点検が行われた。[[図.3>#fig3]]に箱断面トラス桁のダイヤフラム配置を示す。R92、R93、R94の位置で斜材と下側横リブに座屈と塗膜剥離が見つかった([[図.4>#fig4]])。
&br;
CENTER:&aname(fig3);&attachref(./Tokyo_Gate_Bridge_5.jpg,40%);&br;
&br;
CENTER:Fig.3 The placement of the diaphragms in the box of the truss girder(In Japanese).
&br;
&br;
CENTER:&aname(fig4);&attachref(./Tokyo_Gate_Bridge_6.jpg,50%);&br;
&br;
CENTER:Fig.4 The buckling of the bottom lateral rib and diagonal members.
&br;
CENTER:&aname(fig5);&attachref(./Tokyo_Gate_Bridge_7.jpg,50%);&br;
CENTER: (a) (b)
&br;
CENTER:Fig.5 The fatigue cracks which were found at R92.((a):The fatigue crack at the welded joint of bottom lateral rib and longitudinal rib.(b):The fatigue crack at the welded joint of bottom lateral rib and lower flange.)
&br;
**6.Repair method applied [#nbeaff9c]
>The damaged block which was from J32 to J34 was replaced to new block.The damaged block was removed at Jan 9th 2011,and the new block was erected at Jan 23th 2011([[Fig.6>#fig6]]).
&br;
CENTER:&aname(fig6);&attachref(./Tokyo_Gate_Bridge_8.jpg,50%);&br;
CENTER: (a) (b)
&br;
CENTER:Fig.6 Replacement of the damaged block((a):Removal of the damaged block.(b):Erection of the new block.)
&br;
**Reference [#g233bbdd]
>Chitoshi Miki:The damage of the truss girder that occurred during marine transportation,'''Journal of the Japan Society of Civil Engineers''',vol.97,No.4.April.2012(In Japanese)
&br;
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