JPH09183397A - Welded beam structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fatigue fracture while considering a flow of stress toward a weld bead in a welded beam structure used for a hull, an offshore structure, or a steel product on the land. SOLUTION: An end part, of a beam constructed by welding a face member 1 to the side edge part of a rib member 2 is installed to a mounting face in a structure member 9 by means of welding (a bead 8), and in a snip type end part of the rib member 2, a tip plate member 2a, which is thicker than the adjacent rib member 2 part, is arranged. A bead 7 of fillet welding, by which the face member 1 is installed to the rib member 2, is extended in both ends of the side edge part in the rib member 2, so that a pair of extended beads 7a are formed. The bead 8 of fillet welding, by which the rib member 2 is installed to the structure member 9, is extended on the structure member 9, so that a pair of extended beads 8a are formed. Because of existence of the extended beads 7a, 8a, the stresses in the welding beads flow properly, and in combination with the thickened tip plate member 2a, concentration of the stress in the structure member 9 and a rib member 2 can be eased, and consequently, generation of a fatigue strength deterioration part. is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welded girder structure used for ships, offshore structures or land-based steel products, and more particularly to a welded girder structure with improved arrangement of weld beads at the girder ends.

[0002]

2. Description of the Related Art As conventional welding girder structures, FIG. 19 (side view), FIG. 20 (enlarged view of portion J of FIG. 19) and FIG. 21 (K of FIG. 20)
(As viewed from the arrow), the end of the steel rib 2 is attached to the mounting surface of the steel structural member 9 by fillet welding (bead 8), and the side edge of the rib 2 is provided. The metal face plate 1 is attached to the end face of the structural member 9 by means of fillet welding (bead 7) so that its end is slightly separated from the structural member 9.

Then, the end of the rib 2 is subjected to fillet welding (bead 4) with the structural material 9 in the thickness direction of the rib 2,
A corner turning fillet weld is formed such that the bead 4 extends between the beads 8 on both sides. Also,
A fillet weld (bead 3) is applied between the end of the face material 1 and the rib 2 in the widthwise direction so that the bead 3 extends between the beads 7 on both sides. A turn fillet weld is constructed.

[0004]

By the way, in the above-mentioned conventional welded girder structure, a snip structure for reducing stress concentration at the girder end is adopted as shown in the drawing, and the corner turning fillet welded portion is adopted. However, under severe operating conditions, it is feared that fatigue strength lowering portions (stress concentrated portions) 5 and 6 as shown in FIGS. 22 and 23 will occur. The present invention is intended to solve such a problem, in consideration of the flow of stress to the weld bead, it is possible to prevent the decrease in fatigue strength by reducing the local stress, It is intended to provide a welded girder structure.

[0005]

In order to achieve the above-mentioned object, the welding girder structure of the present invention increases the height of the mounting surface of a metal structural member while curving the side edges toward the mounting surface. The metal ribs attached by welding the ends of the snip shape, and the metal surface attached by welding so that the edges are slightly separated from the above-mentioned structural materials at the side edges of the ribs. In the girder structure consisting of the timber, a substantially trapezoidal tip plate material that is sandwiched between the structural material and the face material at the end of the rib and further protrudes from the end of the same material is adjacent. It is characterized in that it is formed with a thicker board than the rib material. As described above, when the end plate material having a substantially trapezoidal shape at the end portion of the rib member is formed so as to have a plate thickness larger than that of the adjacent rib member portion, the fatigue strength lowering portion which has been conventionally concerned in this portion The increase of the plate thickness allows the generation to be properly suppressed.

Further, the welded girder structure of the present invention is characterized in that the tip plate member is connected to the rib member portion adjacent to the tip plate member by welding. Accordingly, the trapezoidal tip plate member can be easily installed by welding means to the adjacent rib members.

Further, in the welded girder structure of the present invention, the above-mentioned tip plate material is integrally formed on the above-mentioned rib material portion adjacent to the tip plate material through the difference thickness plate material whose thickness is gradually increased. It is characterized by being. In this way, when the trapezoidal tip plate member is integrally formed on the adjacent rib members through the thickness difference plate member, the stress in the boundary region between the tip plate member and the rib member adjacent to the plate member is reduced. It does not cause concentration, which is extremely advantageous in terms of strength.

In the welded girder structure of the present invention, the ends of the ribs are attached to the structural material by fillet welding on both sides, and the beads of the fillet welding are slightly extended on the structural material. A pair of extended beads with structural material are formed, and the face materials are attached to both sides of the side edges of the ribs by fillet welding, respectively, and the beads of the fillet welds are attached to the side edges of the ribs. It is characterized by a pair of extension beads with ribs that are slightly extended on both sides. In this way, the bead of each fillet weld that attaches both ends of the rib to the structural material is slightly extended on the structural material to form a pair of extended beads with structural material, and When the bead of each fillet weld attached to both sides of the side edge of the rib is extended slightly on both sides of the rib to form a pair of extension beads with ribs, the rib to the structural member is With the presence of the extension beads described above, the stress flow in the weld bead can be properly performed while sufficiently maintaining the attachment strength of the material and the attachment strength of the face material to the rib material. The concentration of stress on the timber and ribs is relieved, and in combination with the presence of the above-mentioned tip plate material of the thick plate, the effect of suppressing the occurrence of the fatigue strength reduced portion is appropriately performed.

Further, in the welding girder structure of the present invention, the end portion of the tip plate material is subjected to fillet welding with the structural material in the thickness direction of the plate material, and the bead of the fillet welding is the above. It is formed so as to straddle between a pair of extension beads with structural material, and the end portion of the face material is subjected to fillet welding with the tip plate material in the width direction of the same material to form the same corner. It is characterized in that a bead for meat welding is formed so as to extend between the pair of ribbed extension beads.

In the above structure, the bead of fillet welding applied to the structural member in the thickness direction of the plate member at the end of the thickened plate member is the extension with the pair of structural members. Since the beads are formed so as to straddle each other, the strength of attachment of the rib to the structural material is increased, and the watertightness of the joint surface between the two members is maintained.

Further, a bead of fillet welding applied to the end plate of the face material in the width direction of the same face material with the tip plate material extends between the pair of ribbed extension beads. When formed, the watertightness of the joint surface between both members is maintained while increasing the attachment strength of the same surface material to the rib material.

Further, in the welded girder structure of the present invention, a snip-shaped end portion, which is increased in height while the side edges are concavely curved, is attached to a mounting surface of a metal structural member by welding. In a girder structure consisting of a metal ribbed material and a metal face material attached by welding so that the end portion is slightly separated from the structural material at the side edge of the ribbed material, While being sandwiched between the structural material and the face material at the end portion, the side edge of the tip plate portion formed further upward and protruding from the end portion of the same surface material is more than the end of the face material. From the side edge position slightly separated from the upper,
It is characterized by having a curved shape with a larger curvature up to the side edge terminal position of the tip plate portion.

As described above, in the welded girder structure, the rib member has a snip-shaped end portion which is increased while concavely bending the side edge portion, and the side edge portion of the tip plate portion of the end portion is made of the face material. If the side edge of the rib has a curved shape with a larger curvature from the side edge position slightly above the end to the side edge end position, the side edge of the rib is appropriately concave at the end thereof in two steps. It becomes curved, the flow of stress in this portion becomes smoother, and it becomes possible to sufficiently prevent the occurrence of a fatigue strength reduced portion.

Further, in the welded girder structure of the present invention, the ends of the rib having the tip plate portion are attached to the structural member by fillet welding on both sides, and the beads for the fillet welding are attached to the structural member. A pair of extension beads with a structural material that are slightly extended above are formed, and the face material is attached to both sides of the side edge of the rib material by fillet welding, respectively, and the beads of the fillet weld are attached to the rib material. It is characterized by the formation of a pair of extension beads with ribs that are slightly extended on both sides of the side edges of the.

In this way, fillet-welding beads that join the ends of the ribs to the structural members are formed as extended beads extending from both sides of the end plate portion of the ribs onto the structural members. Moreover, when the bead of fillet welding that joins the face material to the side edge of the rib is formed with an extension bead extending from both sides of the side edge of the rib to the side edge of the rib. The flow of stress in the weld bead is appropriately performed, the concentration of stress on the structural material and ribs is relaxed, and the occurrence of fatigue strength lowering portions is suppressed. Furthermore, in the welding structure of the present invention, the end portion of the tip plate portion is subjected to fillet welding with the structural material in the thickness direction of the tip plate portion, and the bead of the fillet welding is the pair. Is formed so as to straddle between the extension beads with the structural material, and the end portion of the face material is subjected to fillet welding with the tip plate material in the width direction of the same surface material to form the same fillet. It is characterized in that a weld bead is formed so as to extend between the pair of ribbed extension beads.

In the above structure, the bead of fillet welding applied to the structural material in the thickness direction of the plate portion at the end of the increased thickness of the tip plate portion is formed by the pair of structural materials. Since it is formed so as to straddle between the extended beads, the watertightness of the joint surface between both members is maintained while increasing the attachment strength of the rib to the structural member.

Further, the bead of the fillet weld applied to the end plate portion in the width direction of the same face material in the width direction of the same face material extends between the pair of ribbed extension beads. When it is formed, the watertightness of the joint surface between both members is maintained while increasing the attachment strength of the same surface material to the rib material.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a welding girder structure as a first embodiment of the present invention. FIG. FIG. 1 is a side view showing a schematic configuration when adopted, and FIG.
FIG. 3 is a side view of an essential part showing an enlarged A part of FIG.

As shown in FIGS. 1 to 3, the end portions of the steel ribs 2 are attached by welding between the attachment surfaces of the flat steel structural members 9, 9 and the upper edge of the ribs 2 is attached. A steel face plate 1 is attached to the portion by welding so that the end portions thereof are slightly separated from the structural members 9, 9. In the girder structure constituted by the face material 1 and the rib material 2 in this way, a snip shape for relaxing concentration of stress at both ends thereof is adopted as shown in the figure. That is, the rib 2 has a snip-shaped end that is increased while the side edge is concavely curved toward the mounting surface of the structural member 9.

In this manner, the end plate 2a having a substantially trapezoidal shape which is sandwiched between the structural member 9 and the face plate 1 at the end of the rib 2 and further protrudes from the end of the face plate 1 is formed. , It is formed with a thicker board than the adjacent ribs. In the present embodiment, the tip plate material 2a is connected to the adjacent rib material portion by welding (bead 10).

Further, as a means for avoiding the occurrence of a portion where the fatigue strength is reduced, both ends of the rib 2 are attached to the structural members 9 and 9 by fillet welding (beads 8) on both sides, and the fillet is the same. Extension beads 8a, 8 with a pair of structural members obtained by slightly extending the weld bead 8 on each structural member 9, 9
a is formed. The face material 1 is attached to both sides of the upper edge of the rib 2 by fillet welding (bead 7), and the bead 7 of the fillet weld is extended slightly on both sides of the upper edge of the rib 2. A pair of extended beads with ribs 7a, 7a are formed.

In the welding girder structure of the first embodiment, as described above, in addition to the tip plate member 2a having an increased plate thickness being provided at the end of the rib member 2 where cracks are likely to occur, the rib member 2 is also provided. The bead 8 of each fillet weld that attaches both sides of the end to the structural material 9 is slightly extended on the structural material to form a pair of extended beads 8a with structural material and the face material 1 The bead 7 of each fillet weld attached to both sides of the side edge of the rib 2 is slightly extended on both sides of the rib 2 to form a pair of extension beads with ribs 7a, 7a. While maintaining sufficient attachment strength of the rib 2 to 9 and attachment strength of the face piece 1 to the rib 2, the flow of stress in the weld bead is appropriately performed by the presence of the extension beads 7a and 8a. Then, the stress concentration on the structural material 9 and the ribs 2 is relieved, and the plank The effect of suppressing the occurrence of the presence coupled with fatigue strength reduction portion of the tip plate 2a (reference numeral 5 and 6 of FIG. 22 and FIG. 23) is obtained.

The trapezoidal tip plate member 2a having an increased plate thickness
The installation can be performed very easily because it is connected by welding (bead 10) to the rib material portion adjacent to the tip plate material.

Next, a welding girder structure as a second embodiment of the present invention will be described. FIG. 4 is a side view showing a schematic structure when the present structure is adopted for a hull or the like, and FIG. 5 shows a portion C of FIG. FIG. 6 is an enlarged side view of an essential part, and FIG. 6 is a view on arrow D of FIG. As shown in FIGS. 4 to 6, also in the case of the present embodiment, similarly to the welding girder structure of the above-described first embodiment, a configuration including a substantially trapezoidal tip plate member 2a having an increased plate thickness is further provided. In order to avoid the occurrence of the fatigue strength reduced portion, the welded structure is provided with the following means.

That is, both ends of the rib 2 are attached to the structural members 9 and 9 by fillet welding (beads 8) on both sides, and the bead 8 of the same fillet welding is applied to the structural members 9 and 9.
9 Extension beads with a pair of structural members extended slightly on 8
a, 8a are formed, and the tip plate member 2 of the rib member 2 is formed.
The edge portion of a is subjected to fillet welding (bead 4) with the structural material 9 in the thickness direction of the plate material 2a, and the bead 4 of the same fillet welding is performed.
Are formed so as to straddle between the pair of extension beads 8a having the structural material.

The face material 1 is attached to both sides of the upper edge of the rib 2 by fillet welding (bead 7), and the bead 7 of the fillet weld is attached on both sides of the upper edge of the rib 2. A pair of slightly extended extension beads 7a, 7 with ribs
In addition to the formation of a, the end portion of the face material 1 is subjected to fillet welding (bead 3) with the tip plate material 2a in the width direction of the face material 1, and the bead 3 of the same fillet welding is described above. It is formed so as to straddle between the pair of extension beads 7a, 7a with ribs.

In the welding girder structure of the second embodiment, as described above, the trapezoidal tip plate member 2a having an increased plate thickness is provided at the snip-shaped end of the rib member 2, and Bead 8 for each fillet weld that attaches both sides of the end to the structural material 9
Are slightly extended on the same structural material 9 to form a pair of extended beads 8a with structural material, and the bead 7 of each fillet weld that attaches the face material 1 to both sides of the side edge portion of the rib 2. Since the pair of extension beads 7a and 7a with ribs are formed by being slightly extended on both sides of the rib 2, the rib 2 to the structural material 9 is formed.
With the presence of the extension beads 7a and 8a, the flow of stress in the welding bead is properly performed while sufficiently maintaining the attachment strength of the surface material 1 to the rib material 2 and the attachment strength of the face material 1 to the rib material 2. In the case of the embodiment as well, like the first embodiment, the concentration of stress on the structural material 9 and the ribs 2 is alleviated, and the presence of the tip plate material 2a of the thick plate contributes to the fatigue strength reduced portion (see FIGS. 22 and 23). The effect of suppressing the occurrence of reference numerals 5 and 6) is obtained.

In the second embodiment, the bead 4 for fillet welding is applied between the end of the tip plate 2a of the rib 2 and the structural member 9 in the thickness direction of the plate 2a. Since it is formed so as to straddle between the pair of extension beads 8a having a structural material, the attachment strength of the rib 2 to the structural material 9 is increased, and the watertightness between the joint surfaces of the two members 2 and 9 is increased. Sex is maintained.

Further, the bead 3 for fillet welding, which is applied to the end plate of the face plate 1 in the width direction of the face plate with the tip plate member 2a, has the above-described pair of ribbed extension beads 7a and 7a. Since it is formed so as to straddle the space, the rib 2 of the same face material 1
The watertightness of the joint surface between the two members 1 and 2 is maintained while increasing the attachment strength to the member.

Next, a welding girder structure as a third embodiment of the present invention will be described. FIG. 7 is a side view showing a schematic structure when the present structure is adopted for a hull or the like, and FIG. 8 shows an E portion of FIG. FIG. 9 is an enlarged side view of the main part, and FIG. 9 is a view taken in the direction of arrow F in FIG. In the welding girder structure of the third embodiment, the installation means of the tip plate material 2a in the welding girder structure of the first embodiment described above is
While the adjacent ribs are welded (beads 10), the difference thickness plate material is made to change the plate thickness in sequence 11.
The other configuration is exactly the same as that of the first embodiment, except that it is performed by means of a smooth connection integrally via.

As described above, when the trapezoidal tip plate member 2a is formed integrally with the adjacent rib members through the thickness difference plate member 11, the boundary between the tip plate member 2a and the rib member adjacent to the plate member 2a is formed. There is no concentration of stress in the region, which is extremely advantageous in terms of strength. The other operational effects of the welded girder structure of the second embodiment are substantially the same as those of the first embodiment described above.

Next, a welding girder structure according to a fourth embodiment of the present invention will be described. FIG. 10 is a side view showing a schematic structure when the present structure is adopted for a hull or the like, and FIG. 11 shows a G portion of FIG. FIG. 12 is an enlarged side view of an essential part, and FIG. 12 is a view on arrow H in FIG. In the welding girder structure of the fourth embodiment, the installation means of the tip plate member 2a in the welding girder structure of the second embodiment described above is
While the adjacent ribs are welded (beads 10), the difference thickness plate material is made to change the plate thickness in sequence 11.
The other configuration is exactly the same as that of the second embodiment, except that it is performed by means of a smooth connection integrally via.

As described above, when the trapezoidal tip plate member 2a is formed integrally with the adjacent rib members through the thickness difference plate member 11, the boundary between the tip plate member 2a and the rib member adjacent to the plate member 2a is formed. There is no concentration of stress in the region, which is extremely advantageous in terms of strength. The other operational effects of the welded girder structure of the fourth embodiment are almost the same as those of the above-described second embodiment.

Next, a welding girder structure as a fifth embodiment of the present invention will be described. FIG. 13 is a side view showing a schematic configuration when the present structure is adopted for a hull or the like, and FIG. 14 shows a portion M of FIG. FIG. 15 is an enlarged side view of the main part, and FIG. 15 is a view on arrow N of FIG. As shown in FIGS. 13 to 15, also in the case of the fifth embodiment, the end portions of the steel ribs 2 are attached by welding between the attachment surfaces of the flat plate-shaped steel structural members 9 and 9, At the upper edge of the rib 2, the steel face plate 1 has the end portions of the structural members 9, 9
It is attached by welding so that it is slightly separated from it.

As described above, the girder structure composed of the face material 1 and the rib material 2 has a snip shape for alleviating the concentration of stress at both ends thereof as shown in the figure. That is, the rib 2 has a snip-shaped end that is increased while the side edge is concavely curved toward the mounting surface of the structural member 9. In this way, the end plate portion 2a formed between the structural material 9 and the face material 1 at the end portion of the rib 2 and further protruding from the end portion of the same surface material 1 and tapering upward. ′ Is provided, and the side edge of the tip plate portion 2 a ′ is located at a side edge position 2 slightly separated from the end of the face material 1.
From b to the side edge termination position 2c of the tip plate portion 2a ',
It has a shape 2d that is concavely curved with a larger curvature.

Further, as a means for avoiding the occurrence of the fatigue strength lowering portion, both ends of the rib 2 are attached to the structural members 9 and 9 by fillet welding (beads 8) on both sides, respectively. A pair of extension beads 8a, 8 with a structural material obtained by slightly extending the bead 8 for meat welding on each structural material 9, 9
a is formed. The face material 1 is attached to both sides of the upper edge of the rib 2 by fillet welding (bead 7), and the bead 7 of the same fillet welding is slightly extended on both sides of the upper edge of the rib 2. A pair of extended beads with ribs 7a, 7a are formed.

In the welded girder structure of the fifth embodiment, as described above, the rib 2 has the snip-shaped concavely curved end portion,
Shape 2 in which the tip plate portion 2a 'has a concave curvature with a larger curvature
In addition to the addition of d, both sides of the end of the rib 2 are provided with structural members 9
The bead 8 of each fillet weld to be attached to is extended slightly on the same structural material 9 to form a pair of extended beads 8a, 8 with structural material.
The bead 7 of each fillet weld that attaches the face material 1 to both sides of the side edge of the rib 2 while the a is formed is slightly extended on both sides of the rib 2 to form a pair of extension beads with ribs. 7a,
Since 7a is formed, the flow of stress in the welding bead is increased by the extension beads 7a and 8a while the attachment strength of the rib 2 to the structural member 9 and the attachment strength of the face material 1 to the rib 2 are sufficiently maintained. The stress concentration on the structural member 9 and the ribs 2 is alleviated by the presence of the ribs, and the shape 2d further curved in the tip plate portion 2a 'at the end of the ribs 2 is formed.
In addition to the presence of the above, the effect of sufficiently suppressing the occurrence of the fatigue strength lowering portion (see reference numerals 5 and 6 in FIGS. 22 and 23) can be obtained.

As described above, in the fifth embodiment, the rib 2 has a snip shape in which the end portion is concavely curved, and the end plate portion 2a 'of the end portion of the rib member 2 is concave with a larger curvature. Since the curved shape 2d is given, the above-mentioned first
As compared with the case of the fourth to fourth embodiments, the stress concentration relaxing action at the end portion of the rib 2 is sufficiently performed in two steps.

Next, a welding girder structure as a sixth embodiment of the present invention will be described. FIG. 16 is a side view showing a schematic structure when this structure is adopted for a hull or the like, and FIG. 17 shows a portion P of FIG. FIG. 18 is an enlarged side view of the main part, and FIG. 18 is a view on arrow Q in FIG. As shown in FIGS. 16 to 18, in the case of the present embodiment as well, similar to the welding girder structure of the fifth embodiment described above, the end portion of the rib 2 projects beyond the end portion of the face material 1 and is tapered upward. The plate portion 2 having a configuration including a tip plate portion 2a 'formed in a shape
A concave curved shape 2d having a large curvature is formed in a ',
Further, in order to avoid the occurrence of the fatigue strength reduced portion, the welded structure is provided with the following means.

That is, both ends of the rib 2 are attached to the structural members 9 and 9 by fillet welding (beads 8) on both sides, and the beads 8 of the same fillet welding are attached to the structural members 9 and 9.
9 Extension beads with a pair of structural members extended slightly on 8
a and 8a are formed, and the end portion of the tip plate portion 2a 'of the rib 2 is subjected to fillet welding (bead 4) with the structural member 9 in the thickness direction of the plate portion 2a'. , The bead 4 of the same fillet weld is the above-described pair of extension beads 8a, 8 with a structural material.
It is formed so as to straddle each other.

The face material 1 is attached to both sides of the upper edge of the rib 2 by fillet welding (bead 7), and the bead 7 of the fillet weld is attached to both sides of the upper edge of the rib 2. A pair of slightly extended extension beads 7a, 7 with ribs
In addition to the formation of a, the end portion of the face material 1 is subjected to fillet welding (bead 3) with the tip plate portion 2a 'in the width direction of the face material 1 to form a bead 3 of the same fillet welding. Is formed so as to straddle between the pair of extension beads 7a, 7a with ribs described above.

In the welded girder structure of the sixth embodiment, as described above, the rib 2 has the concavely curved snip-shaped end,
A tip plate portion 2 having a concave curved shape 2d with a larger curvature
a'is provided, and the structural members 9 are provided on both sides of the end of the rib 2.
The bead 8 of each fillet weld to be attached to is slightly extended on the same structural material 9 to form a pair of extended beads 8a with structural material, and the face material 1 is attached to both sides of the side edge portion of the rib material 2. The bead 7 of each fillet weld is slightly extended on both sides of the rib 2 to form a pair of ribbed extension beads 7a, 7a. The flow of stress in the welding bead is increased by the extension beads 7a, 8a while maintaining sufficient attachment strength of the face material 1 to the rib 2.
Due to the presence of the stress, the stress concentration on the structural material 9 and the ribs 2 is alleviated in the same manner as the fifth embodiment in the case of the sixth embodiment, and the concave curved shape 2d is provided. Combined with the presence of the tip plate portion 2a ', the effect of suppressing the occurrence of fatigue strength reduced portions (see reference numerals 5 and 6 in FIGS. 22 and 23) can be obtained.

In the sixth embodiment, the bead of fillet welding is applied between the end of the tip plate portion 2a 'of the rib 2 and the structural member 9 in the thickness direction of the plate portion 2a'. 4 is formed so as to straddle the above-mentioned pair of structural material-equipped extension beads 8a, 8a, so that the strength of attachment of the rib 2 to the structural material 9 is increased, and the two members 2, 9 are joined together. The watertightness of the surface is maintained. Further, the bead 3 of the fillet weld applied between the end plate portion 1 and the tip plate portion 2a 'in the width direction of the face material is formed between the pair of ribbed extension beads 7a, 7a described above. Since it is formed to span
While increasing the attachment strength of the same surface material 1 to the rib material 2, the watertightness of the joint surface between the two members 1 and 2 is maintained.

The tip plate portions 2a 'in the fifth and sixth embodiments of the present invention described above are also
It can be said that it is possible to increase the plate thickness or to provide the portion of the difference thickness plate material 11 similarly to the tip plate material 2a in the above-described first to fourth embodiments, which further improves the fatigue strength. There is no end.

[0045]

As described in detail above, the welding girder structure of the present invention has the following effects. (1) Since the end plate of a trapezoidal shape at the end of the snip-shaped rib is formed so as to have a plate thickness larger than that of the adjacent rib, the fatigue strength-reduced portion, which has been a concern in this area, has been reduced. The increase of the plate thickness allows the generation to be properly suppressed. (2) The trapezoidal tip plate member can be easily installed by welding means to the adjacent rib members. (3) When the trapezoidal tip plate material is integrally formed on the adjacent rib material portion via the difference thickness plate material, stress concentration occurs at the boundary area between the tip plate material and the rib material portion adjacent to the plate material. It is not advantageous to the strength, which is extremely advantageous. (4) The bead of each fillet weld that attaches both sides of the end of the rib to the structural material is slightly extended on the same structural material to form a pair of extended beads with structural material and the face material. When the bead of each fillet weld attached to both sides of the side edge of the rib is extended slightly on both sides of the rib to form a pair of extension beads with ribs, the rib to the structural member is With the presence of the extension beads described above, the stress flow in the weld bead can be properly performed while sufficiently maintaining the attachment strength of the material and the attachment strength of the face material to the rib material. Stress concentration on timber and ribs is relieved,
Combined with the presence of the above-mentioned tip plate material of the thick plate, the action of suppressing the occurrence of the fatigue strength reduced portion is appropriately performed. (5) The bead of fillet welding performed between the structural material in the thickness direction of the thickened end plate of the end of the rib is between the pair of structural extension beads. When it is formed so as to straddle, it is possible to maintain the watertightness of the joint surface between both members while increasing the attachment strength of the rib member to the structural member. (6) The bead of fillet welding performed between the end plate of the same surface material in the width direction of the same surface material at the end portion of the above surface material and the tip plate material with the thickness increased, In the case of being formed so as to straddle each other, it is possible to increase the attachment strength of the same surface material to the rib material while maintaining the watertightness of the joint surface between both members. (7) Since the tip plate part of the rib end that is concavely curved into a snip shape is formed with a concave curvature with a larger curvature, the fatigue strength lowering part, which was previously a concern in this part, is sufficiently generated. Suppressed. (8) The bead of each fillet weld that attaches both sides of the end of the rib that has the tip plate part with the above-mentioned large concave curvature to the structural material is slightly extended on the structural material. ,
A pair of extension beads with structural material are formed, and the bead of each fillet weld that attaches the face material to both sides of the side edge of the rib is slightly extended on both sides of the rib to form a pair of ribs. When the extended beads are formed, the flow of stress in the weld bead is increased while maintaining sufficient attachment strength of the ribs to the structural material and attachment strength of the face material to the ribs. With the presence of the above, the stress concentration on the above structural materials and ribs is alleviated, and the presence of the above-mentioned tip plate portion having a concave curvature shape with a large curvature contributes to the fatigue strength reduction portion. The action of suppressing the occurrence of is properly performed. (9) The bead of fillet welding performed with the structural material in the thickness direction of the tip plate portion having a concave curvature shape with a large curvature at the end of the rib material is the extension bead with the pair of structural materials. When the ribs are formed so as to straddle each other, it is possible to increase the attachment strength of the ribs to the structural material while maintaining the watertightness of the joint surface between the two members. (10) The bead of fillet welding performed between the end plate portion of the rib in the width direction of the same surface material at the end of the surface material,
When it is formed so as to extend between the pair of extension beads with ribs, it is possible to increase the attachment strength of the same surface material to the ribs while maintaining the watertightness of the joint surface between both members. it can.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration when a welding girder structure as a first embodiment of the present invention is adopted in a hull or the like.

FIG. 2 is a side view of an essential part showing an enlarged part A of FIG.

FIG. 3 is a view as seen in the direction of arrow B in FIG. 2;

FIG. 4 is a side view showing a schematic configuration when a welding girder structure as a second embodiment of the present invention is adopted in a hull or the like.

FIG. 5 is a side view of a main part showing an enlarged part C of FIG.

FIG. 6 is a view as viewed in the direction of arrow D in FIG. 5;

FIG. 7 is a side view showing a schematic configuration when a welding girder structure as a third embodiment of the present invention is adopted in a hull or the like.

FIG. 8 is a side view of a main part showing an enlarged part E of FIG.

9 is a view on arrow F of FIG.

FIG. 10 is a side view showing a schematic configuration when a welding girder structure as a fourth embodiment of the present invention is adopted in a hull or the like.

FIG. 11 is a side view of a main part showing an enlarged part G of FIG. 10.

FIG. 12 is a view on arrow H in FIG. 11.

FIG. 13 is a side view showing a schematic configuration when a welding girder structure as a fifth embodiment of the present invention is adopted in a hull or the like.

FIG. 14 is a side view of a main part showing an enlarged part M of FIG. 13.

15 is a view taken in the direction of arrow N in FIG. 14.

FIG. 16 is a side view showing a schematic configuration when a welding girder structure as a sixth embodiment of the present invention is adopted in a hull or the like.

FIG. 17 is a side view of an essential part showing an enlarged part P of FIG. 16.

18 is a view on arrow Q in FIG. 17.

FIG. 19 is a side view showing a schematic configuration of a conventional welding girder structure.

FIG. 20 is a side view of an essential part showing an enlarged part J of FIG. 19.

21 is a view on arrow K in FIG. 20.

22 is a side view showing a situation of occurrence of a fatigue strength reduced portion corresponding to FIG. 20.

23 is a view on arrow L in FIG. 22.

[Explanation of symbols]

 1 face material 2 rib material 2a tip plate material 2a 'tip plate portion 2b position on side edge of tip plate portion 2c side edge end position of tip plate portion 2d concave shape of side edge of tip plate portion 3,4 fillet welding Bead 5,6 Fatigue strength reduced part (stress concentrated part) 7,8 Fillet weld bead 7a Extended bead with rib 8a Extended bead with structural material 9 Structural material 10 Weld bead 11 Different thickness plate material

Claims (8)

[Claims] 1. A metal rib member attached to a mounting surface of a metal structural member by welding a snip-shaped end portion which is increased while the side edge is concavely curved toward the mounting surface, In a girder structure consisting of a metal face material attached by welding so that the end portion is slightly separated from the structural material on the side edge portion of the rib material, the structural material at the end portion of the rib material is A substantially trapezoidal tip plate material further protruding from the end of the surface material while being sandwiched between the surface material and the surface material is formed to have a plate thickness larger than that of the adjacent rib material portion, Welded girder structure. 2. The welded girder structure according to claim 1,
The welding girder structure, wherein the tip plate member is connected to the rib member portion adjacent to the tip plate member by welding. 3. The welding girder structure according to claim 1,
A welded girder structure, wherein the tip plate member is integrally formed on the rib member portion adjacent to the tip plate member via a difference thickness plate member whose plate thickness is sequentially increased. 4. The welding girder structure according to any one of claims 1 to 3, wherein the end portions of the ribs are attached to the structural member by fillet welding on both sides, and A pair of extension beads with a structural material is formed by slightly extending the bead on the structural material, and the face material is attached to both sides of the side edge portion of the rib material by fillet welding, and at the same time A welded girder structure characterized in that a pair of extension beads with ribs are formed by slightly extending the bead on both sides of the side edges of the ribs. 5. The welding girder structure according to claim 4,
The end portion of the tip plate material is subjected to fillet welding with the structural material in the thickness direction of the plate material so that the bead of the fillet welding extends between the pair of extension beads with structural material. And the end portion of the face material is subjected to fillet welding with the tip plate material in the width direction of the face material, and the bead of the fillet weld is the pair of ribbed extension beads. A welded girder structure characterized by being formed so as to straddle each other. 6. A metal rib member attached to a mounting surface of a metal structural member by welding a snip-shaped end portion increased in height while curving the side edge toward the mounting surface, In a girder structure consisting of a metal face material attached by welding so that the end portion is slightly separated from the structural material on the side edge portion of the rib material, the structural material at the end portion of the rib material is The side edge of the tip plate part, which is sandwiched between the face material and further protrudes from the end portion of the same face and is tapered upward, is separated from the end of the face material by a side edge position. To a side edge terminal position of the tip plate portion, the welding girder structure is characterized by having a concavely curved shape with a larger curvature. 7. The welded girder structure according to claim 6,
The ends of the ribs are attached to the structural material by fillet welding on both sides, and a pair of extended beads with structural material formed by slightly extending the beads of the fillet welding on the structural material are formed. Face plates are attached to both sides of the side edges of the ribs by fillet welding, respectively, and a pair of extension beads with ribs in which the beads of the fillet welds are slightly extended on both sides of the side edges of the ribs. Welded girder structure characterized by being formed. 8. The welded girder structure according to claim 7,
The end portion of the tip plate portion is subjected to fillet welding with the structural material in the thickness direction of the tip plate portion, and the bead of the fillet welding is between the pair of extension beads with the structural material. The end of the face material is subjected to fillet welding with the tip plate portion in the width direction of the same face material so that the bead of the fillet weld forms a pair of ribs. A welded girder structure, characterized in that the welded girder structure is formed so as to extend between the extended beads with lumber.