A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PROBLEM TO BE SOLVED: To enhance fatigue strength of a box type structure and to improve operability in welding a plate material closing the box type structure.SOLUTION: A first front lower plate 17A having a plate thickness t3 equal to a plate thickness t4 of a lower joint plate 33F of an arm-side fitting member 33, and a second front lower plate 17B having a plate thickness t3b equal to a plate thickness t3c of a third front lower plate 17C have both their surfaces welded together from both plate thickness-directional sides so as to form one different-thickness plate 18. One-side welding using a backing material 23 from outside the box structure 12 can be performed on a lower joint plate 33F of the arm-side fitting member 33 and the first front lower plate 17A constituting the different-thickness plate 18. Further, one-side welding using a backing material 26 from outside the box type structure 12 can be performed on the third front lower plate 17C joined to lower end sides of left and right side plates 13, 13' and a second front lower plate 17B constituting the different-thickness plate 18.
【課題】 箱型構造体の疲労強度を高めることができ、箱型構造体を閉塞する板材を溶接するときの作業性を高める。【解決手段】 アーム側取付部材３３の下接合板３３Ｆの板厚ｔ４と等しい板厚ｔ３ａを有する第１の前下板１７Ａと、第３の前下板１７Ｃの板厚ｔ３ｃと等しい板厚ｔ３ｂを有する第２の前下板１７Ｂとを、板厚方向の両側から両面溶接することにより１枚の差厚板１８を形成する。これにより、アーム側取付部材３３の下接合板３３Ｆと、差厚板１８を構成する第１の前下板１７Ａとに対し、箱型構造体１２の外側から裏当て材２３を用いた片面溶接を行うことができる。一方、左，右の側板１３，１３′の下端側に接合された第３の前下板１７Ｃと、差厚板１８を構成する第２の前下板１７Ｂとに対し、箱型構造体１２の外側から裏当て材２６を用いた片面溶接を行うことができる。【選択図】 図５
PROBLEM TO BE SOLVED: To enhance fatigue strength of a box type structure and to improve operability in welding a plate material closing the box type structure.SOLUTION: A first front lower plate 17A having a plate thickness t3 equal to a plate thickness t4 of a lower joint plate 33F of an arm-side fitting member 33, and a second front lower plate 17B having a plate thickness t3b equal to a plate thickness t3c of a third front lower plate 17C have both their surfaces welded together from both plate thickness-directional sides so as to form one different-thickness plate 18. One-side welding using a backing material 23 from outside the box structure 12 can be performed on a lower joint plate 33F of the arm-side fitting member 33 and the first front lower plate 17A constituting the different-thickness plate 18. Further, one-side welding using a backing material 26 from outside the box type structure 12 can be performed on the third front lower plate 17C joined to lower end sides of left and right side plates 13, 13' and a second front lower plate 17B constituting the different-thickness plate 18.
【課題】 箱型構造体の疲労強度を高めることができ、箱型構造体を閉塞する板材を溶接するときの作業性を高める。【解決手段】 アーム側取付部材３３の下接合板３３Ｆの板厚ｔ４と等しい板厚ｔ３ａを有する第１の前下板１７Ａと、第３の前下板１７Ｃの板厚ｔ３ｃと等しい板厚ｔ３ｂを有する第２の前下板１７Ｂとを、板厚方向の両側から両面溶接することにより１枚の差厚板１８を形成する。これにより、アーム側取付部材３３の下接合板３３Ｆと、差厚板１８を構成する第１の前下板１７Ａとに対し、箱型構造体１２の外側から裏当て材２３を用いた片面溶接を行うことができる。一方、左，右の側板１３，１３′の下端側に接合された第３の前下板１７Ｃと、差厚板１８を構成する第２の前下板１７Ｂとに対し、箱型構造体１２の外側から裏当て材２６を用いた片面溶接を行うことができる。【選択図】 図５
BOOM FOR CONSTRUCTION MACHINE
建設機械用ブーム
YAMASHITA SATORU (author)
2015-12-21
Patent
Electronic Resource
Japanese
IPC:
E02F
Baggern
,
DREDGING