JP2022108978A - Friction joint structure - Google Patents

Abstract

To provide a friction joint structure for frictionally joining a base material and a splint plate overlappingly with high-strength bolts, which can reduce the weight of a splint plate while reducing the number of high-strength bolts used in a joint part.SOLUTION: In a friction joint structure, a base material and a splint plate are frictionally joined in an overlapped manner with high-strength bolts, where the overlapping surfaces of the base material and the splint plate are subjected to roughening, and the tensile strength of the splint plate is 1.1 times or more the tensile strength of the base material.SELECTED DRAWING: Figure 3

Description

The present invention relates to a friction joint structure.

Patent Document 1 discloses a structure in which a base material made of high-strength steel and a support plate made of steel having a strength of 1.06 times or less than the base material are superimposed and friction-bonded with high-strength bolts. there is

JP 2012-087935 A

By the way, a friction-joint structure using high-strength bolts is widely used as a joining method for steel structures because of its high rigidity and high fatigue strength. However, in a joint where a large stress is borne, the number of high-strength bolts used increases and the weight of the attachment plate also increases, which tends to increase the construction load.

In Patent Literature 1, the superimposed surface of the base material and the splint plate has a surface mode in which a slip coefficient of 0.45 or more is ensured. Therefore, an increase in the number of high-strength bolts used can be suppressed. However, with the technique disclosed in Patent Document 1, it is difficult to suppress the increase in mass of the splint plate.

In the market, in friction joints using high-strength bolts, it is desired to reduce the number of high-strength bolts used and to reduce the weight of the support plate.

The present invention provides a structure in which a base material and a splint plate are superimposed and friction-joined with high-strength bolts, and the number of high-strength bolts used in the joint is achieved by a relatively simple method without applying special processing to the steel material. It is an object of the present invention to provide a friction-bonded structure capable of reducing the weight of the attachment plate while reducing the

A friction-joint structure according to a first aspect of the present invention is a friction-joint structure in which a base material and an attachment plate are superimposed and friction-joined with a high-strength bolt, and is roughened, and the tensile strength of the attachment plate is 1.1 times or more the tensile strength of the base material.

In the friction-bonded structure of the first aspect, since the respective overlapping surfaces of the base material and the support plate are roughened, the coefficient of slip between the base material and the support plate increases. In addition, since the tensile strength of the splint plate is 1.1 times or more the tensile strength of the base material, the superimposed surface of the splint plate is harder than the superimposed surface of the base material, and the superimposed surface of the base material is applied to the superimposed surface. The bite of the overlapping surfaces of the plates increases. Therefore, the coefficient of slip between the base material and the splint plate is improved, and the slip strength between them is improved. As a result, even if the number of high-strength bolts used in the joint portion is reduced, the slip resistance between the attachment plate and the base material can be ensured. In this way, by reducing the number of high-strength bolts used by improving the slip resistance and reducing the bolt arrangement area, it is possible to reduce the size of the backing plate and reduce the weight of the backing plate. In addition, since the tensile strength of the splint is 1.1 times or more that of the base material, even if the thickness of the splint is reduced in order to reduce the weight of the splint, there will be no gap between the splint and the base material. of the joint strength can be ensured.
Therefore, in the above-described friction-bonded structure, for example, compared to a structure in which the tensile strength of the attachment plate is less than 1.1 times the tensile strength of the base material, it is possible to achieve the following by a relatively simple method without applying special processing to the steel material. It is possible to reduce the weight of the attachment plate while reducing the number of high-strength bolts used in the joint.

A friction-joint structure of a second aspect of the present invention is the friction-joint structure of the first aspect, wherein the roughening treatment is blasting or rusting treatment.

In the friction-joint structure of the second aspect, since blasting or rusting treatment among friction surface treatments of steel materials is used as the roughening treatment, for example, regular irregularities are formed on each overlapping surface of the base material and the attachment plate. can be roughened by a simple process compared to a structure in which each of the base material and the support plate is processed.

A friction-bonded structure according to a third aspect of the present invention is the friction-bonded structure according to the first aspect, wherein the roughening treatment of the base material is rusting treatment, and the roughening treatment of the attachment plate is blasting treatment.

In the friction joint structure of the third aspect, red rust is generated on the overlapping surface of the base material, and the overlapping surface of the attachment plate is subjected to blasting treatment to generate red rust on the attachment plate, which has higher strength than the base material. It is possible to increase the biting into the base material by the splint plate and to secure a larger slip coefficient than to cause a change in the surface condition of the overlapping surfaces.

A friction-bonded structure according to a fourth aspect of the present invention is the friction-bonded structure according to any one of the first to third aspects, wherein the base material and the attachment plate are 2.0<(Nb/Nbs)×(Wb /Wbs).
Nb: Required number of bolts when the slip coefficient is set to 0.45 using a backing plate with the same tensile strength as the base metal Nbs: Using a backing plate with a higher tensile strength than the base metal and setting the slip coefficient to 0.45 or more Wb: Weight of backing plate when using a backing plate with the same tensile strength as the base metal and with a slip coefficient of 0.45 Wbs: Using a backing plate with a higher tensile strength than the base metal and setting a slip coefficient of 0.45 Attachment plate mass when 45 or more

In the friction-bonded structure of the fourth aspect, since the base material and the splint plate satisfy the relationship of 2.0<(Nb/Nbs)×(Wb/Wbs), for example, the relationship between the base material and the splint plate is 2.0≧ Compared to the structure of (Nb/Nbs)×(Wb/Wbs), it is possible to reduce the number of high-strength bolts used in the joint and reduce the weight of the support plate.

A friction-joint structure according to a fifth aspect of the present invention is the friction-joint structure according to any one of the first to fourth aspects, and has an elongated plate-like portion. The pair of base materials whose ends are arranged to face each other and the plate-shaped portions of the pair of base materials are overlapped in the thickness direction, and the overlapping portions are fastened to the plate-shaped portions by the high-strength bolts. and at least one splint plate that connects the pair of base materials.

In the friction joint structure of the fifth aspect, at least one splint plate overlaps each plate-like portion of a pair of base materials in the thickness direction, and the overlapped portion of the splint plate is fastened to the plate-like portion by a high-strength bolt, A pair of base materials are connected to each other.
Here, in the above-described friction-bonded structure, since the superimposed surfaces of the base material and the support plate are roughened and the tensile strength of the support plate is higher than that of the base material, the strength at the joint is high. It is possible to reduce the weight of the attachment plate while reducing the number of bolts used. Therefore, at the construction site, the construction load (work load at the construction site) when connecting a pair of base materials with at least one splint plate can be reduced.

A friction-joint structure according to a sixth aspect of the present invention is the friction-joint structure according to the fifth aspect, in which the attachment plates are superimposed on both side surfaces of the pair of base materials.

In the friction-joining structure of the sixth aspect, the support plate is overlapped on both sides in the thickness direction of each of the plate-shaped portions of the pair of base materials. Since the plates are sandwiched, the coefficient of slip between the base material and the support plate due to the high-strength bolt is improved compared to a structure in which the support plate is superimposed only on one side of each plate-like portion in the thickness direction.

A friction-bonded structure according to a seventh aspect of the present invention is the friction-bonded structure according to any one of the first to sixth aspects, wherein the total thickness of the support plate is thinner than the thickness of the base material.

In the friction-bonded structure of the seventh aspect, since the tensile strength of the support plate is higher than the tensile strength of the base material, even if the total thickness of the support plate is smaller than the thickness of the base material, deformation of the support plate does not occur. It is possible to suppress the reduction in rigidity of the joint portion that accompanies this.

A friction-joined structure according to an eighth aspect of the present invention is the friction-joined structure according to any one of the first to seventh aspects, wherein the attachment plate is a steel material that satisfies the relationship 0.7≦YR≦0.9. be.
YR: Ratio of yield strength to tensile strength of steel

In the friction-joined structure of the eighth aspect, steel material satisfying the relationship of 0.7≦YR≦0.9 is used as the attachment plate. Here, since the support plate satisfies the relationship of 0.7≦YR≦0.9, it is possible to suppress a decrease in rigidity of the joint due to deformation of the support plate.

The present invention provides a structure in which a base material and an attachment plate are superimposed and friction-bonded with high-strength bolts, and the friction-joint structure is capable of reducing the weight of the attachment plate while reducing the number of high-strength bolts used in the joint. can provide.

It is a top view which shows the friction-joint structure of 1st Embodiment. It is the side view which looked at the friction-joint structure shown by FIG. 1 from the arrow 2X direction. 3 is an enlarged view of a cross section along line 3X-3X of FIG. 1; FIG. It is a top view which shows the joint structure of 2nd Embodiment. 5 is a side view of the friction-joining structure shown in FIG. 4 as viewed in the direction of arrow 5X; FIG. 6X is an enlarged view of a cross section along line 6X-6X of FIG. 5; FIG. 7X is an enlarged view of a cross-section along line 7X-7X of FIG. 5; FIG. FIG. 8X is an enlarged view of a cross section along line 8X-8X of FIG. 5; 9X-9X of FIG. 5 is an enlarged cross-sectional view. (A) is a plan view of a specimen; (B) is a cross-sectional view of a specimen; 4 is a graph showing the relationship between the slip coefficient of each test piece and the material strength (ratio of strength between attachment plate and base material). 4 is a graph showing the relationship between the average value of the slip coefficient of each test piece and the material strength (ratio of strength between attachment plate and base material).

(First embodiment)
A friction-joint structure according to a first embodiment of the present invention will be described with reference to the drawings.

1 to 3 show the friction joint structure FS of this embodiment. The friction-joint structure FS of this embodiment is a structure in which a pair of base materials and a plurality of attachment plates are joined using high-strength bolts. This friction joint structure FS has a pair of base materials 20, a pair of splint plates 26 and 30, and high-strength bolts 34. As shown in FIG.

(base material 20)
The base material 20 is a steel plate having an elongated plate-like portion 22, as shown in FIGS. 1, the longitudinal direction of the plate-like portion 22 of the base material 20 is indicated by L, and the width direction of the plate-like portion 22 is indicated by W. As shown in FIG. Moreover, in FIG. 2, the thickness direction of the plate-like portion 22 of the base material 20 is indicated by reference symbol T. As shown in FIG.

The plate-like portion 22 of the base material 20 is formed with a plurality of bolt holes 24 through which the high-strength bolts 34 (shaft portions of the high-strength bolts 34) pass. These bolt holes 24 are formed on the side of the longitudinal end 22E of the plate-like portion 22 and overlapped with the support plate 26 and the support plate 30 in the thickness direction. In this embodiment, two bolt holes 24 are formed in the overlapping portion of the plate-like portion 22 .

As shown in FIGS. 1 and 2, the pair of base materials 20 are arranged such that the end portions 22E of the plate-like portions 22 face each other, and the attachment plates 26 and 30 and the high-strength bolts are attached to each other. 34 and the like. The high-strength bolt 34 used in this embodiment is a high-strength hexagonal bolt.

(attachment plate 26)
The attachment plate 26 is a long steel plate, as shown in FIGS. In the state where the support plate 26 is friction-bonded to the base material 20, as shown in FIG. substantially coincides with the width direction of the plate-like portion 22 . Further, when the support plate 26 is friction-bonded to the base material 20 , the thickness direction of the support plate 26 substantially coincides with the thickness direction of the plate-like portion 22 as shown in FIG. 2 .

A plurality of through holes 28 through which the shafts of the high-strength bolts 34 pass are formed in the attachment plate 26 . These through-holes 28 are formed at positions corresponding to the bolt holes 24 in portions of the attachment plate 26 overlapping the plate-like portion 22 in the thickness direction. In the present embodiment, since the support plate 26 overlaps the plate-like portion 22 in the thickness direction, two through-holes 28 are formed in each overlapping portion of the support plate 26, for a total of four.

As shown in FIGS. 1 to 3, the attachment plate 26 overlaps one plate surface of the plate-like portion 22 (the lower plate surface of the attachment plate 26 in FIG. 2), and is secured to the plate by high-strength bolts 34 and the like. It is joined to the portion 22 .

(attachment plate 30)
The support plate 30 is a steel plate having the same shape as the support plate 26 . In the state where the splicing plate 30 is friction-bonded to the base material 20 , the longitudinal direction of the splicing plate 30 substantially coincides with the longitudinal direction of the plate-like portion 22 , and the width direction of the splicing plate 30 corresponds to the width direction of the plate-like portion 22 . roughly agrees with In addition, when the attachment plate 30 is friction-bonded to the base material 20 , the thickness direction of the attachment plate 30 substantially coincides with the thickness direction of the plate-like portion 22 as shown in FIG. 2 .

A plurality of through holes 32 through which shafts of high-strength bolts 34 pass are formed in the support plate 30 . These through holes 32 are formed at positions corresponding to the bolt holes 24 at portions of the attachment plate 30 overlapping the plate-like portion 22 in the thickness direction. In the present embodiment, since the support plate 30 overlaps the plate-like portion 22 in the thickness direction, two through-holes 32 are formed in each of the overlapping portions of the support plate 30, for a total of four.

As shown in FIGS. 2 and 3, the attachment plate 30 overlaps the other plate surface of the plate-like portion 22 (the upper plate surface of the attachment plate 26 in FIG. 22. Specifically, in a state in which the plate-like portion 22 is sandwiched between the support plate 26 and the support plate 30 from both sides in the thickness direction of the plate-like portion 22, the through hole 32, the bolt hole 24, and the through hole 28 are passed through, and the shaft The plate-like portion 22 of the base material 20 and the support plate 26 and the support plate 30 are friction-joined by a high-strength bolt 34 whose tip 34A is screwed into a nut 36 . A washer 38 is arranged between the head 34</b>B of the high-strength bolt 34 and the splint plate 26 , and a washer 40 is arranged between the nut 36 and the splint plate 30 .

The overlapping surfaces of the base material 20 and the attachment plates 26 and 30 are roughened. Here, when the base material 20 and the support plates 26 and 30 are friction-welded, the plate surface of the base material 20 at the portion where the base material 20 and the support plate 26 overlap is referred to as an overlapping surface 22A. A plate surface of the attachment plate 26 is referred to as an overlapping surface 26A. Further, the plate surface of the base material 20 at the portion where the base material 20 and the splint 30 overlap is referred to as an overlapping surface 22B, and the plate surface of the splint 30 at this overlapping portion is referred to as an overlapping surface 30A.

Fine irregularities are formed on the overlapping surfaces 22A and 22B of the plate-like portion 22 of the base material 20 by roughening treatment. The fine irregularities improve the slip coefficient between the overlapping surfaces 22A, 22B of the plate-like portion 22 of the base material 20 and the attachment plates 26, 30. As shown in FIG. As the roughening treatment applied to the overlapping surfaces 22A and 22B in the plate-like portion 22 of the base material 20, it is preferable to use blasting treatment or rusting treatment among the friction surface treatments of the steel materials. This is preferable from the viewpoint of securing a coefficient of slip between the plates 26 and 30 . The term "frictional surface treatment" as used herein refers to treatment for increasing the slip coefficient (synonymous with friction coefficient) of the target plate surface. This friction surface treatment includes aluminum thermal spraying, blasting, rusting treatment (treatment to form a red rust surface by removing floating rust), and the like. Phosphate treatment is also included when the base material is galvanized. In this embodiment, the overlapping surfaces 22A and 22B are roughened so that the slip coefficients between the overlapping surfaces 22A and 22B and the overlapping surfaces 26A and 30A, which will be described later, are 0.45 or more. It has been subjected.

In addition, the overlapping surface 26A of the attachment plate 26 and the overlapping surface 30A of the attachment plate 30 have fine irregularities due to the roughening treatment, similarly to the overlapping surfaces 22A and 22B of the plate-like portion 22 of the base material 20. formed. The slip coefficients between the base material 20 and the overlapping surface 26A of the attachment plate 26 and the overlapping surface 30A of the attachment plate 30 are improved by the fine unevenness. As the roughening treatment applied to the overlapping surface 26A of the attachment plate 26 and the overlapping surface 30A of the attachment plate 30, similarly to the plate-shaped portion 22 of the base material 20, among the friction surface treatments of steel materials, blasting or rusting is performed. It is preferable to use the treatment from the viewpoint of ensuring the coefficient of slip between the overlapping surfaces 26A and 30A and the overlapping surfaces 22A and 22B.

Further, the roughening treatment applied to the overlapping surface 22A of the plate-like portion 22 of the base material 20 and the roughening treatment applied to the overlapping surface 26A of the attachment plate 26 may be the same roughening treatment or different roughening treatments. Although it does not matter, from the viewpoint of securing the coefficient of slip, it is preferable to apply a rusting treatment to the overlapping surface 22A of the base material 20 and to apply a blasting treatment to the overlapping surface 26A of the attachment plate 26 . Similarly, the roughening treatment applied to the overlapping surface 22B of the plate-like portion 22 of the base material 20 and the roughening treatment applied to the overlapping surface 30A of the attachment plate 30 are the same roughening treatment but different roughening treatments. However, from the viewpoint of securing the slip coefficient, it is preferable to apply a rusting treatment to the overlapping surface 22B of the base material 20 and to apply a blasting treatment to the overlapping surface 30A of the attachment plate 30 .
The present invention is not limited to the above configuration, and the overlapping surface 22A of the base material 20 may be blasted and the overlapping surface 26A of the attachment plate 26 may be rusted. The mating surface 22B may be blasted, and the mating surface 30A of the attachment plate 30 may be rusted.

Further, in the present embodiment, the slip coefficients between the overlapping surfaces 26A and 30A of the attachment plate 26 and the overlapping surfaces 30A of the attachment plate 30 and the overlapping surfaces 26A and 30A of the base material 20 are each set to 0.45 or more. In addition, the overlapping surface 26A of the attachment plate 26 and the overlapping surface 30A of the attachment plate 30 are roughened.

Moreover, the tensile strength of each of the attachment plates 26 and 30 is 1.1 times or more the tensile strength of the base material 20 . Specifically, the tensile strength of each of the attachment plates 26 and 30 is 1.1 times or more the tensile strength of the plate-like portion 22 of the base material 20 . In this embodiment, as an example, the tensile strength of the base material 20 is set to 490 Mpa, and the tensile strength of the support plates 26 and 30 is set to 980 Mpa. Note that the tensile strengths of the attachment plates 26 and 30 may be different from each other as long as they are 1.1 times or more the tensile strength of the base material 20 .

Further, in the present embodiment, as shown in FIG. 3, when the thickness of the plate-like portion 22 of the base material 20 is t0, the thickness of the support plate 26 is t1, and the thickness of the support plate 30 is t2, t0>t1+t2. satisfy the relationship In other words, the sum of thicknesses t1 and t2 of attachment plates 26 and 30 is smaller than thickness t0 of base material 20 . In this embodiment, the thickness t1 of the support plate 26 and the thickness t2 of the support plate 30 are the same thickness, but the present invention is not limited to this configuration. The thickness t1 and the thickness t2 may be different.

Also, the support plates 26 and 30 are steel plates satisfying the relationship of 0.7≦YR≦0.9.

Next, the operation of this embodiment will be described.
In the friction-joining structure FS of the present embodiment, the overlapping surfaces of the pair of base material 20 and the support plates 26, 30 are roughened. The slip coefficient of each increases. Further, since the tensile strength of the attachment plates 26 and 30 is 1.1 times or more the tensile strength of the base material 20, the overlapping surfaces 26A and 30A of the attachment plates 26 and 30 are the plate-like portions of the base material 20. 22 are harder than the overlapping surfaces 22A and 22B of the base material 22, and the overlapping surfaces 26A and 26B of the splint plates 26 and 30 bite into the overlapping surfaces 22A and 22B of the plate-like portion 22 of the base material 20 more. Therefore, the slip coefficient between the base material 20 and the attachment plates 26, 30 is improved, and the slip strength between them is improved. As a result, even if the number of high-strength bolts 34 used in the joint portion (friction joint portion) is reduced, the slip strength between the attachment plates 26 and 30 and the base material 20 can be ensured. In this way, by reducing the number of high-strength bolts 34 used by improving the slip resistance and reducing the bolt arrangement area, it is possible to reduce the size of the attachment plates 26 and 30, thereby reducing the weight of the attachment plates 26 and 30. can be achieved. Further, since the tensile strength of the support plates 26 and 30 is set to 1.1 times or more that of the base material 20, the thickness of the support plates 26 and 30 is reduced to reduce the weight of the support plates 26 and 30. Also, the bonding strength between the attachment plates 26 and 30 and the base material 20 can be ensured.
Therefore, in the friction-bonded structure FS, for example, compared to a structure in which the tensile strength of the attachment plates 26 and 30 is less than 1.1 times the tensile strength of the base material 20, the steel material is specially processed (to improve the slip coefficient). It is possible to reduce the weight of the attachment plates 26 and 30 while reducing the number of high-strength bolts 34 used in the joint by a relatively simple method without applying additional processing. As a result, at the construction site, the construction load (work load at the construction site) when connecting the pair of base materials 20 with the attachment plates 26 and 30 can be reduced.

In the friction-joining structure FS, the slip coefficients between the overlapping surfaces 22A and 22B of the plate-like portion 22 of the base material 20 and the overlapping surface 26A of the attachment plate 26 and the overlapping surface 30A of the attachment plate 30 are 0, respectively. Roughening treatment is applied to obtain 0.45 or more. For this reason, in the friction-joint structure FS, it is possible to ensure the slip strength at the joint portion, for example, compared to the structure in which the slip coefficient on the overlapping surfaces is less than 0.45. As a result, in the friction joint structure FS, it is possible to reduce the weight of the support plates 26 and 30 while reducing the number of high-strength bolts 34 used in the joint.

In addition, in the friction-joint structure FS, blasting or rusting treatment is used among friction surface treatments of steel materials as roughening treatment of the base material 20, the attachment plate 26, and the attachment plate 30. Therefore, for example, the base material and the attachment plate The overlapping surfaces of the base material 20 and the attachment plates 26 and 30 are roughened (friction surfaces) by a simple process, compared to the structure in which regular irregularities are processed on the overlapping surfaces of each. be able to.

Furthermore, by generating red rust on the overlapping surface 22A of the plate-like portion 22 of the base material 20 and performing a blasting treatment on the overlapping surface 26A of the attachment plate 26, the plate-like portion 22 of the base material 20 has a higher strength than that of the plate-like portion 22. It is possible to increase the biting of the splint plate 26 into the base material 20 rather than causing red rust to occur on a splint plate 26 to cause a change in the surface mode of the overlapping surface 26A. , a larger slip coefficient can be ensured. Similarly, red rust is generated on the overlapping surface 22B of the plate-shaped portion 22 of the base material 20, and the overlapping surface 30A of the attachment plate 30 is subjected to blasting treatment. It is possible to increase the biting of the attachment plate 30 into the base material 20 rather than causing red rust to occur on the attachment plate 30 to cause a change in the surface mode of the overlapping surface 30A. A larger slip coefficient can be secured between

In addition, in the friction-joining structure FS, the attachment plates 26 and 30 overlap each of the plate-like portions 22 of the pair of base materials 20 in the thickness direction. are sandwiched between the support plates 26 and 30 from both sides in the thickness direction, for example, compared to a structure in which the support plates 26 and 30 are superimposed only on one side of each plate-shaped portion 22 in the thickness direction, the base material 20 and the support plate formed by the high-strength bolts 34 The slip strength between the plates 26 and 30 is improved.

Further, in the friction-bonded structure FS, since the tensile strength of the attachment plates 26 and 30 is higher than that of the base material 20, the total thickness of the attachment plates 26 and 30 is thinner than the thickness of the base material 20. Even so, it is possible to suppress a decrease in rigidity of the joint due to deformation of the attachment plates 26 and 30 .

Furthermore, in the friction-joint structure FS, steel materials satisfying the relationship of 0.7≦YR≦0.9 are used as the support plates 26 and 30 . Here, since the support plates 26 and 30 satisfy the relationship of 0.7≦YR≦0.9, it is possible to suppress a decrease in rigidity of the joint portion due to deformation of the support plates 26 and 30 . Specifically, in the case of a steel material with a small yield ratio YR, the cost of adding alloying elements, heat treatment, and the like is high. On the other hand, if the yield ratio YR is too large, the steel may lose its toughness and cause unexpected deformation. Therefore, by using a steel material having a yield ratio YR of 0.7≦YR≦0.9 for the support plates 26 and 30, it is possible to secure the strength necessary for the joint while keeping the manufacturing cost relatively low.

(Second embodiment)
Next, a joint structure JS according to a second embodiment of the invention will be described. This joint structure JS is a joint structure to which the frictional joint structure of the present invention is applied, and a pair of base materials 60 are connected by splicing plates 76, 80, 84, 88, 92, 96 by means of high-strength bolts 34. . It should be noted that the high-strength bolt 34 used in the second embodiment is the same bolt as in the first embodiment.

(base material 60)
As shown in FIGS. 4 to 6, the base material 60 is, for example, H-section steel as a structural member used for beams or columns of steel frame construction. This base material 60 has a web portion 62 and a pair of flange portions 64 and 66 . The web portion 62 and the pair of flange portions 64 and 66 of the present embodiment are examples of the plate-like portion of the present invention. 4, the longitudinal direction of the base material 60 is indicated by L. As shown in FIG.

As shown in FIGS. 5 and 6, the web portion 62 is formed with a plurality of bolt holes 63 (see FIG. 7) through which the shaft portions of the high-strength bolts 34 pass. Specifically, these bolt holes 63 are formed at the ends of the web portion 62 in the longitudinal direction and at portions where the attachment plates 76 and 80 overlap the web portion 62 in the thickness direction. In this embodiment, 12 bolt holes 63 are formed in the overlapped portion of the web portion 62 .

As shown in FIGS. 5 and 6, the flange portion 64 is formed with a plurality of bolt holes 65 (see FIG. 8) through which the shaft portions of the high-strength bolts 34 pass. Specifically, these bolt holes 65 are formed at the ends of the flange portion 64 in the longitudinal direction and at portions where the support plates 84 and 88 overlap the flange portion 64 in the thickness direction. In this embodiment, 12 bolt holes 65 are formed in the overlapped portion of the flange portion 64 .

As shown in FIGS. 5 and 6, the flange portion 66 is formed with a plurality of bolt holes 67 (see FIG. 9) through which the shaft portions of the high-strength bolts 34 pass. Specifically, the bolt holes 67 of the flange portion 66 are formed at the ends of the flange portion 66 in the longitudinal direction and in portions where the attachment plates 92 and 96 overlap the flange portion 66 in the thickness direction. . In this embodiment, 12 bolt holes 67 are formed in the overlapped portion of the flange portion 66 .

As shown in FIGS. 4 and 5, the pair of base materials 60 are connected to the attachment plates 76, 80, 84, 88, 92, and 96 with their longitudinal ends facing each other. They are connected by high-strength bolts 34 and the like.

(attachment plate 76)
The attachment plate 76 is a long steel plate, as shown in FIG. When the splint plate 76 is friction-bonded to the web portion 62 of the base material 60, as shown in FIG. The width direction substantially coincides with the width direction of the web portion 62 . Further, when the support plate 76 is friction-bonded to the base material 60, the thickness direction of the support plate 76 substantially coincides with the thickness direction of the web portion 62, as shown in FIG.

A plurality of through holes 78 through which the shafts of the high-strength bolts 34 pass are formed in the attachment plate 76 . Specifically, these through holes 78 are formed at positions corresponding to the bolt holes 63 in portions of the attachment plate 76 overlapping the web portion 62 in the thickness direction. In this embodiment, since the support plate 76 overlaps the web portion 62 in the thickness direction, 12 through-holes 78 are formed in each overlapping portion of the support plate 76, for a total of 24 holes.

As shown in FIGS. 5 and 6, the attachment plate 76 overlaps one plate surface of the web portion 62 (the left plate surface of the web portion 62 in FIG. 6), and is attached to the web portion 62 by the high-strength bolt 34 or the like. are spliced.

(attachment plate 80)
The support plate 80 is a steel plate having the same shape as the support plate 76 . Note that when the splicing plate 80 is friction-bonded to the base material 60 , the longitudinal direction of the splicing plate 80 substantially coincides with the longitudinal direction of the web portion 62 , and the width direction of the splicing plate 80 substantially coincides with the width direction of the web portion 62 . match. In addition, when the support plate 80 is friction-bonded to the base material 60 , the thickness direction of the support plate 80 substantially coincides with the thickness direction of the web portion 62 as shown in FIG. 6 .

A plurality of through holes 82 through which the shafts of the high-strength bolts 34 pass are formed in the support plate 80 . Specifically, these through-holes 82 are formed at positions corresponding to the bolt holes 63 in portions of the attachment plate 80 overlapping the web portion 62 in the thickness direction. In this embodiment, since the support plate 80 overlaps the web portion 62 in the thickness direction, 12 through-holes 82 are formed in each overlapping portion of the support plate 80, for a total of 24 holes.

As shown in FIGS. 5 and 6, the attachment plate 80 overlaps the other plate surface of the web portion 62 (the plate surface on the right side of the web portion 62 in FIG. 6), and is attached to the web portion 62 by the high-strength bolt 34 or the like. are spliced. Specifically, in a state in which the web portion 62 is sandwiched between the attachment plates 76 and 80 from both sides in the thickness direction, the through holes 78, the bolt holes 63, and the through holes 82 are passed through, respectively, and the tip 34A of the shaft portion is penetrated. The web portion 62 of the base material 60 and the support plates 76 and 80 are friction-joined by the high-strength bolt 34 screwed into the nut 36 . A washer 38 is arranged between the head 34</b>B of the high-strength bolt 34 and the splint plate 26 , and a washer 40 is arranged between the nut 36 and the splint plate 30 .

The overlapping surfaces of the base material 60 and the support plates 76 and 80 are roughened as in the first embodiment.

The overlapping surface 62A and the overlapping surface 62B of the web portion 62 of the base material 60 are roughened to form fine irregularities. Note that, in the present embodiment, as in the first embodiment, the overlapping surfaces 62A and 62B and the overlapping surfaces 76A and 80A are overlapped so that the slip coefficients are 0.45 or more, respectively. Surfaces 62A and 62B are roughened.

Also, the overlapping surface 76A of the attachment plate 76 and the overlapping surface 80A of the attachment plate 80 are each formed with fine unevenness by a roughening treatment in the same manner as the overlapping surfaces 62A and 62B of the base material 60 . Note that, in the present embodiment, as in the first embodiment, the slip coefficient between the overlapping surface 76A of the attachment plate 76, the overlapping surface 80A of the attaching plate 80, and the overlapping surfaces 62A, 62B is 0.45. As described above, the overlapping surface 76A of the attachment plate 76 and the overlapping surface 80A of the attachment plate 80 are roughened.

(attachment plate 84)
The attachment plate 84 is a long steel plate, as shown in FIG. When the splint plate 84 is friction-bonded to the flange portion 64 of the base material 60, as shown in FIGS. The width direction of the plate 84 substantially coincides with the width direction of the flange portion 64 . Further, when the support plate 84 is friction-bonded to the base material 60, the thickness direction of the support plate 84 substantially coincides with the thickness direction of the flange portion 64, as shown in FIG.

A plurality of through holes 86 through which the shafts of the high-strength bolts 34 pass are formed in the attachment plate 84 . Specifically, these through holes 86 are formed at positions corresponding to the bolt holes 65 in portions of the support plate 84 that overlap the flange portion 64 in the thickness direction. In this embodiment, since the attachment plate 84 overlaps the flange portion 64 in the thickness direction, 12 through-holes 86 are formed in each overlapping portion of the attachment plate 84, for a total of 24 holes.

As shown in FIGS. 5 and 6, the attachment plate 84 overlaps one plate surface of the flange portion 64 (the plate surface positioned above the flange portion 64 in FIG. It is joined to portion 64 .

(attachment plate 88)
The attachment plate 88 is a long steel plate, as shown in FIG. When the splint plate 88 is friction-bonded to the flange portion 64 of the base material 60, as shown in FIG. The width direction substantially coincides with the width direction of the flange portion 64 . Further, when the support plate 88 is friction-bonded to the base material 60, the thickness direction of the support plate 88 substantially coincides with the thickness direction of the flange portion 64, as shown in FIG.

6, the attachment plates 88 are arranged on both sides of the flange portion 64 in the width direction with the web portion 62 interposed therebetween.

A plurality of through holes 90 through which the shafts of the high-strength bolts 34 pass are formed in the attachment plate 88 . Specifically, these through holes 90 are formed at positions corresponding to the bolt holes 65 at portions of the attachment plate 88 that overlap the flange portion 64 in the thickness direction. In the present embodiment, since the support plate 88 overlaps the flange portion 64 in the thickness direction, six through-holes 90 are formed in each overlapping portion of the support plate 88, for a total of 12 holes.

As shown in FIG. 6, the attachment plate 88 overlaps the other plate surface of the flange portion 64 (the plate surface located on the lower side of the flange portion 64 in FIG. 6), and is attached to the flange portion 64 by the high-strength bolts 34 and the like. are spliced. Specifically, in a state in which the flange portion 64 is sandwiched between the mounting plate 84 and the mounting plate 88 from both sides in the thickness direction, the through hole 86, the bolt hole 65, and the through hole 90 are penetrated, respectively, and the tip 34A of the shaft portion is inserted. The flange portion 64 of the base material 60 and the attachment plates 84 and 88 are friction-joined by the high-strength bolt 34 screwed into the nut 36 . A washer 38 is arranged between the head 34</b>B of the high-strength bolt 34 and the splint plate 84 , and a washer 40 is arranged between the nut 36 and the splint plate 88 .

The overlapping surfaces of the base material 60 and the support plates 84 and 88 are roughened as in the first embodiment.

Fine irregularities are formed on the overlapping surfaces 64A and 64B of the flange portion 64 of the base material 60 by roughening treatment. Note that, in the present embodiment, as in the first embodiment, the sliding coefficients between the overlapping surfaces 64A and 64B and the overlapping surfaces 84A and 88A are each set to 0.45 or more. Surfaces 64A and 64B are roughened.

Also, on the overlapping surface 84A of the attachment plate 84 and the overlapping surface 88A of the attachment plate 88, similar to the overlapping surfaces 64A and 64B of the base material 60, fine unevenness is formed by roughening treatment. Note that, in the present embodiment, as in the first embodiment, the slip coefficient between the overlapping surfaces 84A and 88A of the attachment plate 84 and the overlapping surfaces 64A and 64B is 0.45, respectively. As described above, the overlapping surface 84A of the attachment plate 84 and the overlapping surface 88A of the attachment plate 88 are roughened.

(attachment plate 92)
The attachment plate 92 is a long steel plate, as shown in FIG. When the splint plate 92 is friction-bonded to the flange portion 66 of the base material 60, as shown in FIG. The width direction substantially coincides with the width direction of the flange portion 66 . Further, when the support plate 92 is friction-bonded to the base material 60, the thickness direction of the support plate 92 substantially coincides with the thickness direction of the flange portion 66, as shown in FIG.

A plurality of through holes 94 through which the shafts of the high-strength bolts 34 pass are formed in the attachment plate 92 . Specifically, these through holes 94 are formed at positions corresponding to the bolt holes 67 in portions of the support plate 92 that overlap the flange portion 66 in the thickness direction. In the present embodiment, since the support plate 92 overlaps the flange portion 66 in the thickness direction, 12 through-holes 94 are formed in each overlapping portion of the support plate 92, for a total of 24 holes.

As shown in FIGS. 5 and 6, the attachment plate 92 overlaps one plate surface of the flange portion 66 (the plate surface located on the lower side of the flange portion 66 in FIG. It is joined to the portion 66 .

(attachment plate 96)
The attachment plate 96 is a long steel plate, as shown in FIG. When the splint plate 96 is friction-bonded to the flange portion 66 of the base material 60, as shown in FIG. The width direction substantially coincides with the width direction of the flange portion 66 . Further, when the support plate 96 is friction-bonded to the base material 60, the thickness direction of the support plate 96 substantially coincides with the thickness direction of the flange portion 66, as shown in FIG.

In addition, as shown in FIG. 6, the attachment plates 96 are arranged on both sides in the width direction of the flange portion 66 with the web portion 62 interposed therebetween.

A plurality of through holes 98 through which the shafts of the high-strength bolts 34 pass are formed in the attachment plate 96 . Specifically, these through holes 98 are formed at positions corresponding to the bolt holes 67 of the flange portion 66 at portions of the attachment plate 96 overlapping the flange portion 66 in the thickness direction. In this embodiment, since the attachment plate 96 overlaps the flange portion 66 in the thickness direction, six through-holes 98 are formed in each overlapping portion of the attachment plate 96, for a total of 12 holes.

As shown in FIG. 6, the attachment plate 96 overlaps the other plate surface of the flange portion 66 (the plate surface positioned above the flange portion 64 in FIG. 6), and is attached to the flange portion 66 by the high-strength bolts 34 and the like. are spliced. Specifically, in a state in which the flange portion 66 is sandwiched between the support plate 92 and the support plate 96 from both sides in the thickness direction, the through hole 94 of the support plate 92, the bolt hole 67 of the flange portion 66, and the support plate 96 are formed. The flange portion 66 of the base material 60 and the attachment plates 92 and 96 are friction-joined by a high-strength bolt 34 that penetrates through the through hole 98 and has the tip 34A of the shaft portion screwed into the nut 36 . A washer 38 is arranged between the head 34</b>B of the high-strength bolt 34 and the support plate 92 , and a washer 40 is arranged between the nut 36 and the support plate 96 .

The overlapping surfaces of the base material 60 and the attachment plates 92 and 96 are roughened as in the first embodiment.

Fine irregularities are formed on the overlapping surfaces 66A and 66B of the flange portion 66 of the base material 60 by roughening treatment. Note that, in the present embodiment, as in the first embodiment, the sliding coefficients between the overlapping surfaces 66A and 66B and the overlapping surfaces 92A and 96A are each set to 0.45 or more. Surfaces 66A and 66B are roughened.

Also, on the overlapping surface 92A of the attachment plate 92 and the overlapping surface 96A of the attachment plate 96, similar to the overlapping surfaces 66A and 66B of the base material 60, fine unevenness is formed by roughening treatment. Note that, in the present embodiment, as in the first embodiment, the slip coefficients between the overlapping surfaces 92A of the attachment plate 92 and the overlapping surfaces 96A of the attachment plate 96 and the overlapping surfaces 66A and 66B are each 0.45. As described above, the overlapping surface 92A of the attachment plate 92 and the overlapping surface 96A of the attachment plate 96 are roughened.

Further, the tensile strength of each of the attachment plates 76 , 80 , 84 , 88 , 92 , 96 is 1.1 times or more the tensile strength of the base material 60 as in the first embodiment. Specifically, the tensile strength of each of the attachment plates 76 and 80 is 1.1 times or more the tensile strength of the web portion 62 of the base material 60 . Further, the tensile strength of each of the attachment plates 84 and 88 is 1.1 times or more the tensile strength of the flange portion 64 of the base material 60 . Moreover, the tensile strength of each of the attachment plates 92 and 96 is 1.1 times or more the tensile strength of the flange portion 66 of the base material 60 . In this embodiment, the tensile strength of each of the web portion 62, the flange portion 64, and the flange portion 66 of the base material 60 is set to the same tensile strength. , 80, 84, 88, 92, and 96 each have a tensile strength of 980 Mpa. The tensile strengths of the attachment plates 76 , 80 , 84 , 88 , 92 , 96 may be different from each other as long as they are 1.1 times or more the tensile strength of the base material 60 . Also, the tensile strength of each of the web portion 62, the flange portion 64, and the flange portion 66 of the base material 60 may be different.

Further, in the present embodiment, as shown in FIG. 7, when the thickness of the web portion 62 of the base material 60 is t0, the thickness of the support plate 76 is t1, and the thickness of the support plate 80 is t2, t0>t1+t2. fulfill the relationship. In other words, the sum of the thicknesses t1 and t2 of the attachment plates 76 and 80 is less than the thickness t0 of the web portion 62 of the base material 60 . In this embodiment, the thickness t1 of the attachment plate 76 and the thickness t2 of the attachment plate 80 are the same.

Further, in this embodiment, as shown in FIG. 8, when the thickness of the base material 60 at the flange portion 64 is t3, the thickness of the support plate 84 is t4, and the thickness of the support plate 88 is t5, t3>t4+t5. fulfill the relationship. In other words, the sum of the thicknesses t4 and t5 of the attachment plates 84 and 88 is thinner than the thickness t3 at the flange portion 64 of the base material 60 . In this embodiment, the thickness t4 of the attachment plate 84 and the thickness t5 of the attachment plate 88 are the same.

Further, in this embodiment, as shown in FIG. 9, when the thickness of the base material 60 at the flange portion 66 is t7, the thickness of the support plate 92 is t8, and the thickness of the support plate 96 is t9, t7>t8+t9. fulfill the relationship. In other words, the sum of thicknesses t8 and t9 of attachment plates 92 and 96 is thinner than thickness t7 at flange portion 66 of base material 60 . In this embodiment, the thickness t8 of the attachment plate 92 and the thickness t9 of the attachment plate 96 are the same.

Further, in the joint structure JS of the present embodiment, the base material 60 and the attachment plates 76, 80, 84, 88, 92, 96 satisfy the relationship 2.0<(Nb/Nbs)×(Wb/Wbs). .
However, in the above formula, Nb: the number of bolts required when a splint plate with the same tensile strength as the base material is used and the slip coefficient is set to 0.45, The number of bolts required when the coefficient is 0.45 or more, Wb: the weight of the splint plate when the slip coefficient is 0.45 using the splint plate with the same tensile strength as the base material, Wbs: higher tensile strength than the base metal This is the mass of the splint plate when the slip coefficient is set to 0.45 or more using the splint plate.
The "necessary number of bolts" and "supporting plate mass" referred to here are "2.4 Beam joints" of SCSS-H97 Steel frame structure standard joints/H-shaped steel edition [2nd edition] (published by Gihodo Publishing) can be obtained based on the beam joint calculation flow described in . Specifically, the required number of bolts and the thickness of the splint plate are determined based on the beam joint calculation flow described above, and the total mass of the splint plate is calculated from the thickness and shape of the splint plate. By appropriately changing the combination of the slip coefficient and the tensile strength of the support plate, the values of Nb, Nbs, Wb, and Wbs can be derived.
In addition, for high-strength bolt friction joints of steel structures in general, including column joints and beam-to-column joints, the calculation flow described in SCSS-H97 Steel Structure Standard Joints/H-beam Steel Edition [2nd edition] Based on this, it is possible to obtain the "necessary number of bolts" and the "support plate mass".

Also, the attachment plates 76, 80, 84, 88, 92, and 96 are steel plates satisfying the relationship of 0.7≦YR≦0.9.

Next, the operation of this embodiment will be described. It should be noted that description of the effects obtained by using the friction-joint structure FS of the first embodiment will be omitted as appropriate.

In the joint structure JS of the present embodiment, the web portion 62 and the flange portions 64, 66 of the pair of base materials 60 are connected by attachment plates 76, 80, 84, 88, 92, 96, respectively. Here, since the joint structure JS uses the same friction-joint structure as the friction-joint structure FS of the first embodiment, deformation of the base material 60 (the web portion 62 and the pair of flange portions 64 and 66) and attachment plate Since the deformation of 76, 80, 84, 88, 92, 96 is suppressed, the reduction in slip resistance between base material 60 and attachment plates 76, 80, 84, 88, 92, 96 due to high-strength bolt 34 is suppressed. be.

Further, in the joint structure JS, since the pair of base materials 60 and the attachment plates 76, 80, 84, 88, 92, and 96 satisfy the relationship of 2.0<(Nb/Nbs)×(Wb/Wbs), for example, Compared to a structure in which the relationship between the base material and the splint plate is 2.0≧(Nb/Nbs)×(Wb/Wbs), the splint plates 76 and 80 can be , 84, 88, 92, 96 can be made lighter.

(Other embodiments)
Although the high-strength hexagonal bolt is used as the high-strength bolt 34 in the friction joint structure FS of the first embodiment, the present invention is not limited to this configuration. For example, instead of high-strength bolts 34, Torsia-type high-strength bolts may be used. It should be noted that the use of Torsia-type high-strength bolts instead of the high-strength bolts 34 may be applied to the joint structure JS of the second embodiment.

In the friction-bonded structure FS of the first embodiment, the support plates 26 and 30 are stacked on both sides of the pair of base materials 20 in the thickness direction, but the present invention is not limited to this configuration. A configuration in which one splint plate (split plate 26 or splint plate 30) is stacked on one side of the pair of base materials 20 in the thickness direction may be employed, or a structure in which a plurality of splint plates are stacked may be employed. Furthermore, a plurality of splint plates may be stacked on both sides of the pair of base materials 20 in the thickness direction. Note that the above configuration may be applied to the joint structure JS of the second embodiment.

In the second embodiment, the high-strength bolts 34 and the attachment plates 76, 80, 84, 88, 92, and 96 are used to connect the pair of H-shaped steel base materials 60, but the present invention is limited to this configuration. not. For example, splint plates 76, 80, 84, 88, 92, and 96 may be used to connect the base material 60, which is an H-section steel, to another base material having an H-shaped cross section. Here, when the base material 60 is a beam material, the other base material is, for example, an end member of the beam material provided on a pillar or the like. Note that the base material 60 may be used as a pillar material, and another base material may be used as an end member of the pillar material provided on a beam or the like.

Table 1 below shows the values of (Nb/Nbs)×(Wb/Wbs) for each combination of the slip coefficient of the base material and the splint plate and the tensile strength of the splint plate used in the friction-bonded structure of the present invention. As the base material, an H-shaped steel having a tensile strength of 490 Mpa and a size of 700 (H) x 350 (B) x 16 (t1) x 35 (t2) is set. In addition, in Table 1, the reference plate has a tensile strength of 490 MPa and a coefficient of slip with the base metal of 0.45.

As shown in Table 1, by setting the tensile strength of the splint to 1.1 times or more the tensile strength of the base material, the thickness of the splint can be reduced and the weight of the splint can be reduced. . In addition, by setting the slip coefficient between the base material and the splint plate to 0.45 or more (surface mode with a slip coefficient of 0.45 or more), the number of high-strength bolts used can be reduced compared to when the slip coefficient is less than 0.45. It is possible to simultaneously achieve a reduction in the weight of the splint plate and a reduction in the size of the splint plate. Therefore, by making the tensile strength of the backing plate higher than the tensile strength of the base material and setting the slip coefficient to 0.45 or more, it is possible to reduce the number of high-strength bolts used and reduce the weight of the backing plate. Become.

Next, a sliding test was carried out using the strengths of the base material and attachment plate used in the friction-joined structure of the present invention and the roughening treatment method for each overlapping surface as variables. In addition, the specimen used for the test is as shown in FIGS. 10(A) and 10(B). Note that the unit of dimensions in FIG. 10 is mm. The plate thickness of the base material constituting the specimen is 19 mm, and the plate thickness of the support plate is 9 mm. Also, the bolts used for fastening the base material and the support plate are F10T-M22 high-strength bolts. Each parameter and slip coefficient of the specimen are as shown in Table 2 below.

FIG. 11 shows the relationship between the slip coefficient and material strength (strength ratio between the attachment plate and the base material) of each specimen. Symbols ◯, Δ, ◇, and □ in FIG. The roughening treatment of the overlapping surfaces of the base material and the support plate is performed by blasting or rusting. In addition, by making the tensile strength of the splint plate higher than that of the base material, the surface hardness of the splint plate increases, and the splint plate bites into the base plate more. It can be seen that a large slip coefficient can be secured.

FIG. 12 shows the relationship between the average value of the slip coefficient of each test piece and the material strength (ratio of strength between attachment plate and base material). The roughening treatment of the overlapping surfaces of the base material and the backing plate was compared to the test specimen with the base metal blasting and the backing plate with red rust treatment (specimen indicated by the symbol □ in the figure). It can be seen that the specimens with blasted splints (the specimens indicated by symbol ⋄ in the figure) have a larger slip coefficient. In other words, rather than generating red rust on the attachment plate, which is stronger than the base material, and causing a change in the surface condition, red rust is generated on the base material, and the surface condition is maintained by blasting the attachment plate, which is stronger than the base material. It can be seen that by doing so, it is possible to increase the biting into the base material by the splint plate, and to secure a larger slip coefficient.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be implemented in various modifications other than the above without departing from the spirit of the present invention. is of course.

20 base material 22 plate-like portion 22A overlapping surface 22B overlapping surface 22E longitudinal end portion 26 attachment plate 26A overlapping surface 26B overlapping surface 30 attachment plate 30A overlapping surface 30B overlapping surface 34 high-strength bolt 60 H shape Steel (base material)
62 web part (plate-like part)
62A overlapping surface 62B overlapping surface 64 flange portion (plate-like portion)
64A overlapping surface 64B overlapping surface 66 flange portion (plate-like portion)
66A overlapping surface 66B overlapping surface 76 attachment plate 76A overlapping surface 80 attaching plate 80A overlapping surface 84 attaching plate 84A overlapping surface 88 attaching plate 88A overlapping surface 92 attaching plate 92A overlapping surface 96 attaching plate 96A overlapping surface FS friction joint structure

Claims (8)

A friction-joint structure in which a base material and an attachment plate are superimposed and friction-joined with high-strength bolts,
Roughening treatment is performed on the overlapping surfaces of the base material and the attachment plate,
A friction-bonded structure, wherein the tensile strength of the attachment plate is 1.1 times or more the tensile strength of the base material. 2. The friction joint structure according to claim 1, wherein said roughening treatment is blasting treatment or rusting treatment. 2. The friction joint structure according to claim 1, wherein the roughening treatment of the base material is rusting treatment, and the roughening treatment of the attachment plate is blasting treatment. 4. The friction-joining structure according to claim 1, wherein the base material and the attachment plate satisfy a relationship of 2.0<(Nb/Nbs)×(Wb/Wbs).
Nb: Necessary number of bolts when the slip coefficient is set to 0.45 using a backing plate with the same tensile strength as the base metal Nbs: Using a backing plate with a higher tensile strength than the base metal and setting the slip coefficient to 0.45 or more Wb: Mass of splint plate when slip coefficient is set to 0.45 using splint plate with same tensile strength as base metal Wbs: Slip coefficient using splint plate with higher tensile strength than base metal Attachment plate mass when is 0.45 or more a pair of base materials having elongated plate-shaped portions, the longitudinal ends of the plate-shaped portions being arranged to face each other;
At least one attachment plate that overlaps the plate-like portions of each of the pair of base materials in the thickness direction, and that the overlapping portions are fastened to the plate-like portions by the high-strength bolts to connect the pair of base materials. When,
The friction joint structure according to any one of claims 1 to 4. 6. The friction-joining structure according to claim 5, wherein said splint plate is superimposed on both side surfaces of said pair of base materials. The friction-joined structure according to any one of claims 1 to 6, wherein the total thickness of said attachment plate is thinner than the thickness of said base material. The friction joint structure according to any one of claims 1 to 7, wherein the attachment plate is a steel material that satisfies a relationship of 0.7≤YR≤0.9.
YR: Ratio of yield strength to tensile strength of steel

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