JP2002303003A - Friction type high-strength bolted connection structure using filler plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction type high strength bolted connection structure capable of attaining a specified bonding power, regardless of the frictional- surface treatment method in the friction type high-strength bolted connection structure which uses a filler plate aiming at the solving of a lap gap, because there is the lap gap larger than a size allowable on a design between abutted base metals. SOLUTION: In the friction type high-strength bolted connection structure in which the surface roughness of the base-metal faying surfaces of splice plates 3a and 4a and the filler plate 6a is larger than that of a base-metal surface layer or projections in height of 0.2-1.0 mm are formed on the base-metal side frictional surfaces of the splice plates 3a and 4a and the filler plate 6a, mutually engaged and retained irregularities are formed to the frictional surfaces of the splice plates 3a and 4a and the filler plate 6a, and stress working on the base metals due to the shear strength of mutual projecting sections in transmitted to the splice plate 3a and 4a through the filler plate 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength bolted friction joining structure for steel structures such as buildings and bridges, and more particularly, there is a gap between materials to be joined. The present invention relates to a high-strength bolt friction joining structure applied when is used.

[0002]

2. Description of the Related Art When a steel structure such as a building or a bridge is constructed, friction joining using high-strength bolts is often used as a method for joining members such as columns and beams of the steel structure. For example, as shown in FIG. 11, in the friction joining by the high-strength bolt, the base material 1 and the base material 2 having the same thickness are arranged so as to abut each other with a gap e, and straddle the base material 1 and the base material 2. The base material 1 and the base material 2 are joined by tightening the base material 1 and the base material 2 with the high-strength bolts 5 via the attachment plates 3 and 4 arranged to be sandwiched from both sides. The joining force in this case does not depend on the shearing force of the shaft portion of the high-strength bolt 5 but gives a strong tightening force to the high-strength bolt, and the contact surface between the base material 1, the base material 2 and the base plates 3, 4 is high. Obtained by creating a frictional force.

[0003] In this friction joining method, the joining force is obtained by the frictional force between the base material 1 and the base material 2 and the attachment plates 3 and 4. Red rust is generated on the surfaces of the base material 2 and the base plates 3 and 4, and fine irregularities are formed on the surfaces of the base plates 3 and 4 by, for example, shot blasting. In the micro unevenness ks obtained by these friction surface treatments, the slip coefficient (which corresponds to a friction coefficient generally called in the field of steel structural technology) is about 0.45 to 0.7, The design standard is 0.45 in the field and 0.4 in the bridge field. In such a high-strength bolt joining method using the attachment plate, in order to obtain the expected joining force, it is important to manage the friction surfaces of the base materials 1 and 2 and the attachment plates 3 and 4 and furthermore, It is essential that the materials 1 and 2 and the attachment plates 3 and 4 adhere to each other.

On the other hand, as shown in FIG. 12, a gap e is provided when a base material 1 and a base material 2 having different plate thicknesses are to be joined, or due to manufacturing tolerances of the base material, design problems, and the like. In some cases, a “bare plow” a may occur between the base materials 1 and 2 that are abutted against each other. When the “bare-cut” a is large, it is difficult to make the base material 2 on the thinner side and the auxiliary plate 3 adhere to each other, and the expected bonding strength cannot be obtained. Conventionally, when the "bare clearance" exceeds the "bare clearance" allowed by design, a friction surface is provided between the base material 2 on the side where the "bare clearance" occurs and the base plate 3 on both sides of the steel plate. A filler plate 6 having fine irregularities formed on the friction surface between the base material 2 and the base plate 3 by performing the treatment is inserted, and the base materials 1 and 2 and the base plates 3 and 4 are inserted through the filler plate 6. There is also adopted a method of obtaining a frictional force by bringing them into close contact with each other. The term "barrel that is allowable in design" as used herein refers to the size of "barrel" that can be ignored in terms of a decrease in bonding strength, and is 1 mm in JASS6 of the Architectural Institute of Japan.
It is prescribed.

[0005]

A high "slip coefficient" in the design can reduce the number of bolts at the joint and the weight of the attachment plate, thereby reducing the processing and construction costs of the joint. Leads to. Therefore, the present inventors set the surface hardness and the surface roughness of the friction surface side of the base plate that is frictionally joined by being tightened by the high-strength bolt to be larger than the surface hardness and the surface roughness of the friction surface side of the base material. As a result, a high-strength bolted joint structure capable of relatively easily ensuring a "slip coefficient" of 0.6 or more was developed, and the invention according to Japanese Patent Application Laid-Open No. 6-146427 (hereinafter simply referred to as "A invention") was first developed. Filed.

The ratio of the surface hardness of the friction surface of the base plate of the high-strength bolt friction joint to the surface hardness of the base material is 2.5 or more, and the depth of the layer having a high surface hardness is high. Is set to 0.2 mm or more, and a plurality of triangular wavy or pyramid-shaped projections are provided along the surface of the attachment plate, and the height of the projections is set to 0.2 to 1.0 mm. By making the maximum surface roughness of the surface of the material sufficiently smaller than the height of the projections, we have developed a high-strength bolt friction joint structure that can stably secure a “slip coefficient” of 0.9 or more. We have applied for an invention according to Kaihei 8-209809 (hereinafter simply referred to as "B invention").

However, if the "bare clearance" at the joint having a special friction surface treatment as in the inventions A and B exceeds the "bare clearance" allowed by design, a filler plate generally used is used. In the present situation, the expected joining force cannot be obtained because of the small frictional resistance between the filler plate and the friction surface of the base material. Therefore, in the present invention,
In the high-strength bolt friction joining structure in which a special plate is subjected to a special friction surface treatment and a filler plate is inserted as in the inventions A and B, in order to solve the above-described problem, the friction surface treatment method is not limited. It is another object of the present invention to provide a high-strength bolt friction joining structure using a filler plate capable of achieving a predetermined joining force.

[0008]

The present invention has the following features (1) to (4) in order to achieve the above object. (1). There is a "bare plow" between the butted base metals that is larger than the design allows, and a filler plate is used to eliminate the "bare plow". The surface roughness of the surface layer contacting with the base material is greater than the surface roughness of the base material surface layer, or the surface layer contacting the base material of the base plate and the filler plate has a height of 0.2 to 1.0.
In the high-strength bolt frictional joint structure with protrusions of mm, irregularities are formed on the friction surface between the attachment plate and the filler plate to engage and lock with each other, and act on the base material by the shear strength of the mutually convex portions. A high-strength bolt friction joining structure using a filler plate, wherein stress is transmitted to the base plate via the filler plate. (2). In (1), at least one of the irregularities formed on the friction surface between the attachment plate and the filler plate and engaged with each other has an inclined surface of 60 degrees or less with respect to a vertical line, and is attached in a state where the engagement is established. A high-strength bolt friction joining structure using a filler plate, characterized in that mutual irregularities are formed so as to form a minute gap between the plate and the filler plate. (3). (1) or (2), wherein the height of the convex portion of the unevenness formed on the friction surface between the attachment plate and the filler plate and interlocked with each other is 0.2 mm or more; Force bolt friction joining structure. (4). (1) In any one of (1) to (3), the base material-side friction surface of the attachment plate on the side where "bare" occurs and the base material-side friction surface of the filler plate on the side where "bare" does not occur A high-strength bolt friction joint structure using a filler plate characterized by different specifications of the friction surface of the plate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is directed to a filler plate which has a "bare gap" between the base materials to be joined which is larger than a design-permissible size and which eliminates the "bare gap". In the high-strength bolt frictional joint structure using a steel plate, the roughness of the friction surface between the base plate and the base material of the filler plate is larger than the roughness of the base material surface, or the friction surface between the base plate and the base material of the filler plate This is applied when a protrusion (convex portion) having a height h of 0.2 mm or more is provided, and irregularities are formed on the friction surface between the attachment plate and the filler plate so as to be engaged with each other and locked. The stress acting on the base material due to the shear strength of the mutually projecting portions is transmitted to the base plate via the filler plate.

In the present invention, as shown in FIG. 1, basically, the high-strength bolt is tightened in a state where the irregularities formed on the friction surface of the attachment plate 3a and the filler plate 6a are engaged with each other and locked. For example, the protrusions 7 are formed on the filler plate 6a, the recesses 8 are formed between the protrusions, and the recesses 9 are formed on the auxiliary plate 3a. 10 is also formed. Attached plate 3a
And the state where the unevenness of the filler plate 6a is locked,
In order to obtain a preferable locked state of the unevenness between the attachment plate 3a and the filler plate 6a and to make the management of the friction surface easy or unnecessary, at least one of the mutually unevennesses to be locked has the inclination angle α or β. A gap c between the convex portion 7 of the filler plate 6a and the concave portion 9 of the attachment plate 3a locked at the locking start point in a state where they are engaged with each other and locked.
Are formed, and the protrusion 10 of the attachment plate 3a and the filler plate 6 are formed.
It is preferable that a gap b is formed between the concave portions 8a and between the lower surface of the attachment plate 3a and the upper surface of the filler plate 6a. Generally, the rust-preventive coating is performed after the assembly of the high-strength bolted joint, so that the gap b and the gap c are preferably 1 mm or less in order to perform reliable coating.

The shape of the convex portion is a shape that provides sufficient shear strength against a load, for example, an independent convex portion such as a truncated cone, a truncated pyramid, or a prism, or a shape viewed from a direction perpendicular to the load direction. May be trapezoidal, square, or the like, and a shape viewed from a direction perpendicular to the load direction may be a trapezoid, square, or the like, and may be a shape continuous in the direction perpendicular to the load direction, for example, a convex portion having a parallel waveform. Basically, the shape of the concave portion to be engaged with the convex portion is such that when the engaging surface with the convex portion starts engaging with the convex portion, the shape is brought into surface contact or line contact with the convex portion, thereby increasing rigidity. It is preferable in securing. Either the width i of the flat surface at the tip of the convex portion having a small inclination angle is larger than the width j of the concave portion that locks, or the width k of the bottom side of the convex portion having a large inclination angle is larger than the width l of the concave opening surface that locks By increasing the size, a surface contact or a line contact is obtained at the concave portion which is engaged with the convex portion. In addition, as long as surface contact or line contact is obtained at the concave portion engaging with the convex portion, the tip of the convex portion and the valley of the concave portion do not need to be flat surfaces. Angle of inclination α, β
The larger the angle with respect to the vertical line, the easier the construction, but if the inclination angles α and β exceed 60 degrees, the base plate will rise along the inclined surface when stress acts on the base material. Therefore, a sufficient bonding force may not be obtained.

[0012] For example, the inclination angles α, β of
Is selected within a range of 60 degrees or less with respect to the vertical line (however, 0 degrees is not included), and the angle difference (difference between α and β) between the locking surfaces of the irregularities is a factor in securing the joint strength. However, when it is difficult to make α and β the same angle in production, it is preferable that the angle be equal to or less than 20 degrees. If the angle difference between the locking surfaces in the locking region exceeds 20 degrees, sufficient shear strength cannot be obtained, so that sufficient bonding strength cannot be obtained. It is preferable that the height h of the projection is 0.2 mm or more. If it is less than 0.2 mm, sufficient shear strength cannot be secured and sufficient bonding strength cannot be obtained. The upper limit depends on the thickness conditions of the base plate and filler plate corresponding to the thickness of the base material, etc.
Select within a range where strength reduction can be ignored.

It is preferable that the above-mentioned conditions for forming the unevenness are the same in order to easily match the locking positions of the unevenness when the unevenness is locked and to secure uniform shear strength. In the example of FIG. 1, the leading edge of the convex portion 7 of the filler plate 6 a is locked to the inclined surface 9 t of the concave portion 9 of the auxiliary plate 3 a, but the convex portion (flat surface) 1 of the auxiliary plate 3 a is locked.
0 may be locked to the inclined surface 6t of the convex portion 7 of the filler plate 6a. Further, if the filler plate 6a is fixed to the base plate with an adhesive or the like in advance before assembling the joint, not only the workability at the site can be greatly improved, but also the base plate 3a It is possible to eliminate the need for management during transport of the locking surface of the filler plate 6a.

[0014]

(Embodiment 1) FIGS. 2 to 4 show Embodiment 1 of the present invention.
It will be described based on. In the first embodiment, as shown in FIG. 2, the "bare gap" a generated between the thick base material 1 and the thin base material 2 is large, and the thin base material 2 4a
Since it is difficult to adhere the filler plate 6a, the filler plate 6a
The present invention is applied to a structure in which the base materials 1 and 2 and the attachment plates 3a and 4a are brought into close contact with each other via a filler plate 6a and tightened with high-strength bolts 5 to obtain a frictional force. The frictional surface between the filler plate 3a and the filler plate 6a is formed with irregularities having an inclined surface as shown in FIG. 1 and engaged with each other and locked, and the stress acting on the base material 2 due to the shear strength of the mutually convex portions. Is transmitted to the attachment plate 3a via the filler plate 6a.

The filler plate 6a of the first embodiment
Forms a triangular wave-shaped unevenness kp having a slip coefficient of 0.9 or more according to the invention B (hereinafter, referred to as “triangular wave-shaped unevenness kp according to the invention B”) as shown in FIG. A convex portion 7 having a height h of 1.0 mm and a concave portion (flat surface) 8 having two parallel wavy inclined surfaces 7t as shown in FIG. And has an insertion hole 11 for the high-strength bolt 5. On the other hand, as shown in FIG. 4 (a), the attachment plate 3a has unevenness k on the friction surface with the base material 1 having the same shape as the base material side friction surface of the filler plate 6a.
and a concave portion 9 having a height (depth) h of 1.0 mm having the same number of parallel corrugated projections 7 as the parallel corrugated convex portions 7 of the filler plate 6a on a friction surface with the filler plate 6a. A flat surface (corresponding to a convex portion) 10 is formed as shown in FIG. 4B, and has a plurality of insertion holes 12 for high-strength bolts 5. Further, as shown in FIG. 4B, the attachment plate 4a is provided with a filler plate 6 on a friction surface between the base material 1 and the base material 2.
In this figure, irregularities kp having the same shape as the friction surface with the base material 2 of a are formed.

When the base material 1 and the base material 2 are joined by high-strength bolts, as shown in FIG. 2, the base material 1 and the base material 2 are arranged so as to abut each other with a gap e provided therebetween. And attachment plate 4a
Are arranged so as to straddle the base material 1 and the base material 2, and a filler plate 6a for eliminating the "bare" is inserted between the lower surface of the thin base material 2 and the upper surface of the base plate 3a. As shown in FIG. 1, the inclined surface 9t of the concave portion 9 of the auxiliary plate 3a and the leading edge of the convex portion 7 of the filler plate 6a are engaged with each other and locked, and sandwiched between the auxiliary plate 3a and the auxiliary plate 4a. The irregularities of the attachment plate 3a and the filler plate 6a, which are fastened and locked by the high-strength bolts 5, are press-fitted to obtain a joining force mainly between the irregularities.

In the state shown in FIG. 2, lightly tightened with the high-strength bolt 5, as shown in FIG. 1, the tip edge of the convex portion 7 of the filler plate 6a is securely fitted to the inclined surface 9t of the concave portion 9 of the attachment plate 3a. Locked, flat lower surface of attachment plate 3a (tip surface of projection 10)
Uniform gap b between the upper surface and the flat upper surface of the filler plate 6a
Are formed, and a gap c equal to or larger than the gap b is formed between the tip end surface of the projection 7 of the filler plate 6a and the upper surface of the recess 9 of the attachment plate 3a. From this state, in the process of further tightening the high-strength bolt 5 to reach a predetermined bolt tension, the convex portion 7 of the filler plate 6a is formed.
Is press-fitted into the concave portion 9 of the auxiliary plate 3a, and when the tightening is completed, the adhesion between the inclined surface 7t of the convex portion 7 of the filler plate 6a and the inclined surface 9t of the concave portion 9 of the auxiliary plate 3a increases, and the solidity increases. Joined state. In this manner, the stress acting on the base material 2 due to the shear strength of the projections 7 of the filler plate 6a is transmitted to the base plate 3a via the filler plate 6a, so that both the joint strength and the rigidity are significantly higher than in the past. It can be increased, and it can be easily applied regardless of the friction surface treatment of the base material and the base plate, and the friction surface management on the contact surface between the base plate and the filler plate at the site is unnecessary. Become.

Embodiment 2 Embodiment 2 of the present invention will be described with reference to FIGS. In the second embodiment, as shown in FIG. 5, similarly to the first embodiment, the "bare gap" a generated between the base material 1 having a large thickness and the base material 2 having a small thickness is large and the thickness is small. Since it is difficult to bring the base material 2 and the base plate 4a into close contact with each other, a filler plate 6a is inserted between the base material 2 and the base plate 4a on the side where "bare clearance" a is generated, and the base materials 1, 2 Attached plates 3a, 4
a and a filler plate 6a and a filler plate 6a.
A triangular-wave-shaped continuous unevenness having an inclined surface as shown in FIG. 1 is formed on the friction surface of FIG. 1A and engaged with each other to be locked, and the stress acting on the base material 2 due to the shear strength of the mutually convex portions. Is transmitted to the attachment plate 3a via the filler plate 6a.

The filler plate 6a of the second embodiment
6A, a triangular wave-shaped unevenness kp according to the invention B is formed on the friction surface with the base material 2 as shown in FIG.
As shown in FIG. 1 and a plane as shown in FIG. 6 (b), a triangular wave-shaped height h is 0.2 mm or more.
f (convex portion 7, concave portion 8) is formed, and has an insertion hole 11 for the high-strength bolt 5. On the other hand, the attachment plate 3a
7A, a triangular wave-shaped unevenness kp according to the invention B is formed on the friction surface with the base material 1 as shown in FIG. 7A, and the friction surface with the filler plate 6a has a cross section of FIG. ), The triangular wave-shaped unevenness k of the filler plate 6a
f (the convex portion 7 and the concave portion 8), and the height (depth) h of the triangular wave shape to be engaged and locked is 0.2 mm or more.
The convex hole 10) is formed, and the insertion hole 1 of the high-strength bolt 5 is formed.
2. The attachment plate 4a is shown in FIG.
As shown in the figure, the frictional surface between the base material 1 and the base material 2 has unevenness k of the same shape as the unevenness of the friction surface between the base material 2 and the filler plate 6a.
p is formed.

In the case of joining the base material 1 and the base material 2 with high-strength bolts, the triangular wave-shaped continuous irregularities kf (projections 7 and depressions 8) of the filler plate 6a and the base plate 3a are different from those of the first embodiment. Although the arrangement of the triangular wave-shaped continuous unevenness kf (the concave portion 9 and the convex portion 10) is not the same, a method substantially similar to that in the first embodiment is employed, and therefore, detailed description is omitted here. In this manner, the stress acting on the base material 2 due to the shear strength of the convex portion (convex portion 7) of the triangular wave-shaped continuous unevenness kf of the filler plate 6a is transmitted to the auxiliary plate 3a via the filler plate 6a. Both the joint strength and the rigidity can be dramatically increased as compared with the related art. The attachment plates 3a, 4
a of the friction surfaces of the base material 1 and the base material 2 with the base material 2 of the filler plate 6a and the friction surface of the base plate 2 with the same shape. The unevenness of the friction surface between the base plate and the filler plate 3a of the filler plate 6a has the same shape. Since these unevennesses are all triangular waves, they can be easily formed by common equipment. Processing costs can be reduced as compared with the above.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIGS. In the second embodiment, as in the first embodiment, the "bare gap" a generated between the thick base material 1 and the thin base material 2 is large, and the thin base material 2 and the auxiliary plate 4a are formed.
Since it is difficult to adhere the filler plate 6a, the filler plate 6a
Is inserted into the base materials 1 and 2 and the attachment plates 3a and 4a are brought into close contact with each other via a filler plate 6a, and the structure is applied in a structure in which a frictional force is obtained by tightening with high-strength bolts 5. On the friction surface of the filler plate 6a, irregularities having an inclined surface as shown in FIG. 1 are formed and engaged with each other and locked, and the stress acting on the base material 2 due to the shear strength of the mutually convex portions is reduced by the filler. Attached plate 3a via plate 6a
It is intended to be transmitted to. In the third embodiment, the unevenness of the frictional surface of the base plate 3a with the base material 1 is reduced.
This embodiment differs from the first embodiment in that the specifications of the irregularities of the friction surface of the base material 2 with the base material 2 and the irregularities of the friction surface with the base materials 1 and 2 of the attachment plate 4a are changed.

The base materials 1 and 2 of Example 3 were subjected to shot blasting on the surfaces of the friction surface with the attachment plate 3a and the friction surface with the filler plate 6a to obtain a ten-point average roughness Rz (DI
N) is about 50 to 60. Also, the filler plate 6a covers the entire friction surface with the base material 2 as shown in FIG.
As shown in FIG. 9B, fine irregularities k of about Rz (DIN) 130 in the invention A are formed by grid blast, and the frictional surface with the attachment plate 3a is the same as that of the first embodiment as shown in FIG. Are formed with two convex portions 7 and concave portions 8 (flat surfaces) having a height of 1.0 mm and having a parallel-wave-shaped inclined surface 7t, and having an insertion hole 11 for the high-strength bolt 5.

On the other hand, as shown in FIG. 10 (a), the attachment plate 3a has fine irregularities k of the same shape as the friction surface of the filler plate 6a with the base material formed on the friction surface with the base material 1, As shown in FIG. 10 (b), a height (depth) having the same number (two lines) of parallel wave-shaped inclined surfaces 9t as the parallel wave-shaped protrusions 7 of the filler plate 6a is formed on the friction surface with the filler plate 6a. H) is formed with a concave portion 9 having a height of 1.0 mm and a flat surface (corresponding to a convex portion) 10 and having an insertion hole 12 for a high-strength bolt 5. Further, as shown in FIG. 10B, the attachment plate 4a has a triangular wave-shaped unevenness kp according to the invention B formed on a friction surface with the base materials 1 and 2, and has a bolt insertion hole 12. . When the base material 1 and the base material 2 are joined by high-strength bolts, the case of the first embodiment is different from the case of the first embodiment in that the friction surface of the filler plate 6a with the base material 2 and the friction surface of the base plate 3a with the base material 2 Although the specifications are not the same, a method substantially the same as that of the first embodiment is employed, and thus the detailed description is omitted here.

In the first, second, and third embodiments, the number of the filler plates 6a is one. However, the number of the filler plates is not necessarily one, and a small filler plate 6a is obtained due to restrictions on processing equipment. May be advantageous, and in that case, dividing into two or more sheets is also considered. The present invention is not limited to the above embodiments 1, 2 and 3. For example, although the base material to be joined is shown as a plate, a flange and a web of H-section steel and a square steel pipe are used. It can also be applied to channel steels and the like. In addition, the conditions (including arrangement) of the unevenness in the filler plate and the auxiliary plate, the number and arrangement of the bolt holes, and the like are determined according to the conditions to be joined, the high-strength bolt conditions, the load conditions, the required friction joining strength, and the like. Modifications may be made without departing from the scope of the present invention.

[0025]

According to the present invention, since the stress transmission on the friction surface between the base plate and the filler plate is performed by the uneven shear force, the joining strength and the rigidity can be drastically increased as compared with the prior art. It can be easily applied to high-strength bolted joints where the friction surface of the plate has been specially treated, and has the effect of eliminating the need to manage the friction surface at the contact surface between the base plate and filler plate on site. Things.

[Brief description of the drawings]

FIG. 1 (a) is a partial cross-sectional explanatory view showing an example of forming irregularities between a base plate and a filler plate and an example of an engaged state of irregularities in a friction joining structure of a high strength bolt according to the present invention.

FIG. 2 is an explanatory side view showing the high-strength bolt friction joining structure according to the first embodiment of the present invention.

3A is an explanatory plan view showing a base material side friction surface (upper surface) of the filler plate used in Example 1, and FIG. 3B is a plan view showing a base plate side friction surface (lower surface). FIG.

FIG. 4A is an explanatory plan view showing a friction surface (upper surface) on the filler plate side of the attachment plate used in Example 1, and FIG.
FIG. 3 is an explanatory plan view showing a base material side friction surface (lower surface) of an anti-filler plate side attachment plate used in Example 1.

FIG. 5 is an explanatory side view showing a high-strength bolt friction joining structure according to a second embodiment of the present invention.

6A is an explanatory plan view showing a base material side friction surface (upper surface) of a filler plate used in Example 2, and FIG. 6B is a plan view showing a base plate side friction surface (lower surface). FIG.

7A is an explanatory plan view showing a filler plate-side friction surface (upper surface) of a base plate used in Example 2; FIG. 7B is a plan view showing an anti-filler plate side used in Example 2; FIG. 3 is an explanatory plan view showing a base material side friction surface (lower surface) of the attachment plate.

FIG. 8 is a side view illustrating a high-strength bolt friction joining structure according to a third embodiment of the present invention.

9A is an explanatory plan view showing a base material side friction surface (upper surface) of a filler plate used in Example 3, and FIG. 9B is a plan view showing a base plate side friction surface (lower surface). FIG.

10A is an explanatory plan view showing a filler plate-side friction surface (upper surface) of a base plate used in Example 3, and FIG.
The figure is a plane explanatory view showing the base material side friction surface (lower surface) of the auxiliary plate on the side opposite to the filler plate used in Example 3.

FIG. 11 is an explanatory side view showing a conventional high-strength bolt friction joining structure using a base plate of a base material having the same thickness.

FIG. 12 is an explanatory side view showing a conventional high-strength bolt friction joining structure using a base plate and a filler plate of a base material having different thicknesses.

[Explanation of symbols]

 1, 2 Base material 3, 3a Lower surface side mounting plate 4, 4a Upper surface side mounting plate 5 High strength bolt 6 Filler plate 6a Filler plate having convex portion 7 Filler plate convex portion 7t Convex portion inclined surface 8 Filler plate 9 Depression of flat plate 9 Depression of auxiliary plate 9t Inclined surface of concave portion 10 Convex portion of auxiliary plate (flat surface) 11, 12 Bolt insertion hole kp Triangular wave shape unevenness kf Triangle wave shape continuous unevenness k Micro unevenness

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuyoshi Uno 20-1 Shintomi, Futtsu-shi, Chiba F-term in the Technology Development Division, Nippon Steel Corporation (reference) 2E125 AA52 AA56 AE13 AG06 AG12 BA55 BB02 BB22 BD01 BE03 BE08 BF04 CA05 CA71 DA01

Claims (4)

[Claims] 1. There is a "barrel" between the butted base materials that is larger than the design allows, and a filler plate is used to eliminate the "barrel". The surface roughness of the surface layer in contact with the base material of the filler plate is larger than the surface roughness of the surface layer of the base material, or the height of 0.2 to
In a high-strength bolt friction joint structure with a 1.0 mm projection, irregularities are formed on the friction surface between the base plate and the filler plate to engage and lock with each other. A high-strength bolt frictional joint structure using a filler plate, wherein the acting stress is transmitted to the base plate via the filler plate. 2. At least one of irregularities formed on a friction surface between a base plate and a filler plate and interlocking with each other has an inclined surface of not more than 60 degrees with respect to a vertical line, and is interlocked with each other. 2. The structure according to claim 1, wherein the concave and convex portions are formed such that a minute gap is formed between the plate and the filler plate.
2. The high-strength bolt friction joining structure according to 1. 3. The method according to claim 1, wherein the height of the projections formed on the friction surface between the base plate and the filler plate and engaging with each other is 0.2 mm or more. High-strength bolt friction joining structure using a filler plate. 4. A specification of a base material-side friction surface of the attachment plate on the side where "bare" occurs and a base material-side friction surface of the filler plate, and a specification of a friction surface of the attachment plate on the side where "bare" does not occur. The high-strength bolt friction joining structure using the filler plate according to any one of claims 1 to 3, characterized in that: