JP2008008019A - Friction joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized and low-cost friction joint structure which can make an apparent coefficient of friction higher than that of a conventional friction joint structure, so that members, having cross-shaped corners unadjacent to each other, among four joint members provided in a first member can be fastened to each other. <P>SOLUTION: The friction joint structure 1 has cross-shaped members 2a and 2b, and joint members 3a, 3b, 3c and 3d are provided on the mutually crossing surfaces of the cross-shaped members 2a and 2b, respectively. The joint members, in positions in which the cross-shaped corners of the cross-shaped members 2a and 2b are un adjacent to each other, among the joint members 3a, 3b, 3c and 3d are fastened together by means of a high-strength bolt as a fastening means. In other words, the cross-shaped members 2a and 2b and the joint members 3a, 3b, 3c and 3d are fastened together by using the axial force of the high-strength bolt. Thus, the cross-shaped members 2a and 2b and the joint members 3a, 3b, 3c and 3d are joined together by frictional forces which are generated among the cross-shaped members 2a and 2b and the joint members 3a, 3b, 3c and 3d. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a friction bonding structure.

  Conventionally, as a method for connecting a building structure such as a beam, a column, or a streak, friction bonding using a high-strength bolt has been used.

Friction welding is a method in which an axial force is introduced into a high-strength bolt to fasten a joining member, and the members are connected by frictional force generated between the members.
In addition, the following methods are known as a joining method of a strut (Patent Document 1).
Japanese Patent Laying-Open No. 2005-42537

  On the other hand, in friction welding, the friction force depends on the friction coefficient of the joint and the axial force of the bolt. However, the friction joint surfaces of steel materials used in building structures are usually treated as red rust surfaces or shot blast surfaces, but it is difficult to stably obtain a large friction coefficient, and the friction coefficient is 0. .45 is set. Therefore, in order to obtain a large frictional force, the axial force of the bolt must be increased.

  For this reason, the number of bolts must be increased or the diameter of the bolts must be increased, resulting in a problem that the joint becomes larger and the cost is increased.

  The present invention has been made in view of such problems, and an object thereof is to provide a friction bonding structure that is small in size and low in cost.

  In order to achieve the above-described object, the present invention provides a first member having a substantially cross-shaped cross-section, and four members each provided so as to contact two surfaces of the first member that intersect each other. A joining member, and fastening means for fastening the joining members provided at positions where the corners formed by the cross are not adjacent to each other through the first member, among the joining members, The friction joining structure is characterized in that the first member and the joining member are joined by a frictional force generated between the first member and the joining member.

  The joining member has two joining members provided at positions adjacent to each other at an angle formed by the cross, or an end of the four joining members opposite to the side to be joined to the first member. The connected end portions are formed in one or a plurality of substantially plate-like shapes, have a pin joint portion having a first pin insertion hole, and correspond to the one or more pin joint portions. An attachment member having a substantially plate-like shape and having a second pin insertion hole; and a pin provided through the first pin insertion hole and the second pin insertion hole. The connected end portions of the joining members may be joined by the pins.

The fastening means is a high strength bolt.
The joining member may have a protrusion on a surface in contact with the first member.

  In the present invention, the friction joining structure includes a first member having a substantially cross-shaped cross section and four joining members provided so as to be in contact with the crossing surface of the first member. Among the two joining members, members that are not adjacent to each other at an angle formed by the cross are fastened.

  According to the present invention, among the four joining members provided on the first member, the members that are not adjacent to each other at the angle formed by the cross are fastened, so that the apparent friction coefficient is higher than that of the conventional friction joining structure. The friction joining structure can be reduced in size and cost.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.
FIG. 1 is a perspective view showing a friction joining structure 1 according to the first embodiment, and FIG. 2 is a view in the direction of arrow A in FIG.

3 is a perspective view showing the joining member 3a of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB of FIG.
Further, FIG. 5 is an enlarged view of the vicinity of the joining member 3a of FIG.

As shown in FIGS. 1 and 2, the friction joining structure 1 has a cross-shaped member 2a as a first member and a cross-shaped member 2b as a second member.
The cross-shaped members 2a and 2b are members whose cross-sectional shapes in the axial direction are substantially cross-shaped, and the crossing angle of the surfaces intersecting each other is approximately 90 °.
The material of the cross-shaped members 2a and 2b is structural carbon steel or the like.

  Joining members 3a, 3b, 3c, and 3d are provided on the crossing surfaces of the cross-shaped members 2a and 2b.

  As shown in FIGS. 3 and 4, the joining member 3a is a member having a triangular cross section, and through holes 8a, 8b, 8c, and 8d are provided so as to penetrate the center of the triangle. The structure of the joining members 3b, 3c, and 3d is the same.

The joining members 3a, 3b, 3c, and 3d are provided so as to be in contact with both surfaces of the cross-shaped members 2a and 2b that intersect each other.
The material of the joining members 3a, 3b, 3c and 3d is the same as that of the cross-shaped members 2a and 2b.
Note that the joining members 3a, 3b, 3c, and 3d may have protrusions on the surfaces in contact with the cross-shaped members 2a and 2b.

  The high-strength bolts 5a, 5b, 5c, 5d, 7a, 7b, 7c, 7d are inserted into through holes provided in the joining members 3a, 3b, 3c, 3d, and further penetrate the cross-shaped members 2a, 2b. Is provided.

  And the joining member 3a and the joining member 3c are fastened by the high strength bolts 5a, 5b, 5c, and 5d, and the joining member 3b and the joining member 3d are fastened by the high strength bolts 7a, 7b, 7c, and 7d. Yes.

  In other words, the joining members 3a, 3b, 3c, and 3d are fastened by high-strength bolts as fastening means at the corners formed by the crosses of the cross-shaped members 2a and 2b that are not adjacent to each other.

  The cross-shaped members 2a, 2b and the joining members 3a, 3b, 3c, 3d are fastened by the axial force of the high strength bolts 5a, 5b, 5c, 5d, 7a, 7b, 7c, 7d, and thereby the cross-shaped member 2a. The cross-shaped members 2a, 2b and the joining members 3a, 3b, 3c, 3d are joined by a frictional force generated between 2b and the joining members 3a, 3b, 3c, 3d.

  In this way, the joining members 3a, 3b, 3c, and 3d connect the cruciform member 2a and the cruciform member 2b.

  Here, the frictional force generated between the cross-shaped members 2a, 2b and the joining members 3a, 3b, 3c, 3d will be described.

  As shown in FIG. 5, the high-strength bolts 5a fasten the joining member 3a and the cruciform member 2a, so that vertical drag forces 12a and 12b are generated between the joining member 3a and the cruciform member 2a.

When the vertical drag forces 12a and 12b are N and the crossing angle 10 of the cruciform member 2a is θ, the relationship between the pressing force C between the joining member 3a and the cruciform member 2a is expressed by the following equation.
C = 2N · sinθ

Accordingly, when the frictional force is F, the apparent friction coefficient μ between the joining member 3a and the cross-shaped member 2a is expressed by the following equation.
μ = F / C = F / (2N · sin θ)

  Since μ (F / C) increases as θ decreases, when 2θ = 90 ° as in the first embodiment, μ is smaller than when plates are fastened together (when 2θ = 180 °). The value is about 1.4 times.

Accordingly, as in the first embodiment, the joining member 3a is provided so as to be in contact with both surfaces of the cross-shaped members 2a and 2b that intersect each other, and the angle formed by the cross of the cross-shaped members 2a and 2b is determined. By fastening members that are not adjacent to each other with high-strength bolts, the apparent friction coefficient can be obtained without changing the material of the joining member 3a and the cross-shaped members 2a and 2b, the tightening force of the bolts, and the number of bolts. Can be increased.
In addition, when a protrusion is provided on the surface of the joining member 3a, a resistance force is generated by digging between the protrusion and the cross-shaped member 2a, so that the apparent friction coefficient can be further increased.

  That is, the friction joining structure 1 can reduce the number of bolts and the diameter of the bolt as compared with a conventional friction joining structure in which flat plates are fastened together. Structure.

  As described above, according to the first embodiment, the friction joining structure 1 includes the cruciform members 2a and 2b and the joining members 3a and 3b provided so as to contact the crossing surfaces of the cruciform members 2a and 2b. 3c and 3d, and of the joining members 3a, 3b, 3c and 3d, the joining members 3a and 3c and the joining members 3b and 3d which are not adjacent to each other at the corners formed by the cross are fastened by high-strength bolts. Has been.

  Therefore, the apparent friction coefficient can be increased as compared with the case where the flat plates are fastened to each other, and the friction bonding structure 1 can be reduced in size and cost.

Next, a second embodiment will be described.
6 is a side view showing the structure 19 provided with the friction joining structures 1a and 1b according to the second embodiment. FIG. 7 is a perspective view of the vicinity of the friction joining structure 1a in FIG. 6, and FIG. It is a figure which shows the 7 gusset plate 25a.
FIG. 9 is a perspective view showing another embodiment of the striation 27 and the strut 27 in FIG.

  Note that, in the second embodiment, elements having the same functions as those of the friction joining structure 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the second embodiment, in the first embodiment, the friction bonding structures 1a and 1b are used to connect the strut 27 and the columns 21a and 21b and the beams 23a and 23b.

As shown in FIG. 6, the structure 19 has columns 21a and 21b, and beams 23a and 23b are provided between the columns 21a and 21b.
Both ends of the beams 23a and 23b are connected to the columns 21a and 21b, respectively.

  A gusset plate 25a is provided at a connecting portion between the column 21b and the beam 23b. Similarly, a gusset plate 25b is provided at a connecting portion between the column 21a and the beam 23a.

A streak 27 is provided between the gusset plate 25a and the gusset plate 25b.
Both ends of the strut 27 are connected to the gusset plates 25a, 25b via the friction joining structures 1a, 1b.

As shown in FIG. 7, the end portion of the strut 27 has a substantially cross-shaped cross section, and corresponds to the cross-shaped member 2a in the first embodiment.
On the other hand, as shown in FIG. 8, the end portion of the gusset plate 25a also has a substantially cross-shaped cross section, which corresponds to the cross-shaped member 2b in the first embodiment.

  Further, joining members 3a, 3b, 3c (not shown) and 3d (not shown) are provided on the crossing surfaces of the strut 27 and the gusset plate 25a.

  In the joining members 3a, 3b, 3c, and 3d, the members 27 and the gusset plate 25a that are not adjacent to each other at the corners of the cross are fastened by high-strength bolts as fastening means. Yes.

  That is, the strut 27 and the gusset plate 25a and the joining members 3a, 3b, 3c, 3d are fastened by the axial force of the high-strength bolts 5a, 5b, 5c, 5d, 7a, 7b, 7c, 7d. 2a and 2b and the joining members 3a, 3b, 3c and 3d are joined by frictional force generated.

  In addition, since the structure of the friction joining structure 1b is the same as that of the friction joining structure 1a, description is abbreviate | omitted.

  Thus, by using the friction joining structures 1a and 1b for connecting the strut 27 and the gusset plates 25a and 25b, the connecting portion can be made smaller and less expensive.

  In addition, the shape of the striation 27 may be such that at least the cross-sectional shape of the end portion is substantially cross-shaped.

Therefore, the portion other than the end portion may be a column as shown in the streak 27 shown in FIG. 9A, or the portion other than the end portion is plate-like like the streak 27a shown in FIG. 9B. You may have the shape of.
Note that the overall cross-sectional shape may be a substantially cross shape, as in a streak 27b shown in FIG.

  Thus, according to 2nd Embodiment, as for the structure 19, the both ends of the strut 27 are connected with the gusset plates 25a and 25b via the friction joining structures 1a and 1b, The structure of the friction joining structure 1a Has a cross-shaped striation 27, and a structure in which gusset plates 25a and 25b are connected to joining members 3a, 3b, 3c and 3d.

  Accordingly, the same effects as those of the first embodiment are obtained.

Next, a third embodiment will be described.
10 is a perspective view showing a friction joining structure 31 according to the third embodiment, FIG. 11 is an exploded perspective view of FIG. 10, and FIG. 12 is a plan view showing a clevis-like member 33a.
Further, FIG. 13 is a view in the direction of arrow D in FIG.

  In the third embodiment, elements having the same functions as those of the friction joining structure 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the friction joining structure 31 according to the third embodiment, in the first embodiment, the joining member 3a and the joining member 3d, the joining member 3b and the end of the joining member 3c are connected to each other, and the clevis-like members 33a and 33b are connected. It is a thing.

As shown in FIG. 10 to FIG. 13, the joining members located at the positions adjacent to each other at the corners of the cross of the cruciform member 2 a, that is, the ends of the joining members 3 a and 3 d are pin joints The connecting portion 37a is provided with a pin insertion port 39a as a first pin insertion hole.
Similarly, end portions of the joining member 3b and the joining member 3c are connected by a connecting portion 37b, and a pin insertion port 39b is provided in the connecting portion 37b.

The joining members 3a and 3d and the connecting portion 37a constitute a clevis-like member 33a.
Similarly, the clevis-like member 33b is constituted by the joining members 3b and 3c and the connecting portion 37b.

  That is, the friction joining structure 31 includes a cruciform member 2a and clevis-like members 33a and 33b provided so as to sandwich the cruciform member 2a.

By adopting such a structure, the joint can be mechanically completely pinned. Moreover, a junction part can be made small and cost can be reduced. Furthermore, it can be set as the junction part excellent in the designability.
The clevis-like member 33a and the clevis-like member 33b can be integrated by inserting pins (not shown) into the pin insertion openings 39a, 39b.

As described above, according to the third embodiment, the friction joining structure 31 includes the cross-shaped member 2a and the joining members 3a, 3b, 3c provided so as to contact the crossing surfaces of the cross-shaped member 2a. Among the joining members 3a, 3b, 3c, and 3d, the joining members 3a and 3c and the joining members 3b and 3d that are not adjacent to each other at the corners formed by the cross are fastened by high-strength bolts. .
Accordingly, the same effects as those of the first embodiment are obtained.

In addition, according to the third embodiment, the end portions of the joining members 3a and 3d and the joining members 3b and 3c, which are joining members at positions adjacent to each other at the angle formed by the cross of the cruciform members 2a and 2b, are provided. The connecting portions 37a and 37b are connected to each other, and the connecting portions 37a and 37b are provided with pin insertion ports 39a and 39b.
Therefore, the joint can be mechanically completely pinned. Moreover, a junction part can be made small and cost can be reduced. Furthermore, it can be set as the junction part excellent in the designability.

  Next, a fourth embodiment will be described. 14 is a side view showing the structure 41 provided with the friction bonding structures 31a and 31b. FIG. 15 is a perspective view of the vicinity of the friction bonding structure 31a of FIG. 14, and FIG. 16 is an exploded perspective view of FIG. is there.

  Note that, in the fourth embodiment, elements having the same functions as those of the friction bonding structure 31 according to the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the fourth embodiment, in the third embodiment, the friction joining structures 31a and 31b are used to connect the strut 27 and the columns 21a and 21b and the beams 23a and 23b.

  As shown in FIG. 14, a gusset plate 45a as an attachment member is provided at the connecting portion between the column 21b and the beam 23b, and a gusset plate 45b is provided at the connecting portion between the column 21a and the beam 23a.

  A strut 27 is provided between the gusset plate 45a and the gusset plate 45b, and both ends of the strut 27 are connected to the gusset plates 45a, 45b via the friction joining structures 31a, 31b.

As shown in FIGS. 15 and 16, the clevis-like members 33a and 33b are provided so as to sandwich the end portion of the strut 27 and the gusset plate 45a.
Further, the pin 43 is provided through a pin insertion port 40 as a second pin insertion hole provided in the pin insertion ports 39a and 39b and the gusset plate 45a.

  In addition, since the structure of the friction joining structure 31b is the same as that of the friction joining structure 31a, description is abbreviate | omitted.

  Thus, by using the friction joining structures 31a and 31b for joining the strut 27 and the gusset plates 45a and 45b, the joint between the stiffening 27 and the clevis-like members 33a and 33b of the friction joining structures 31a and 31b can be reduced. can do. Further, since the clevis-like members 33a and 33b and the gusset plates 45a and 45b are joined by the pins 43, the joints can be mechanically completely pinned.

  Thus, according to the fourth embodiment, the structure 41 has a structure in which both ends of the strut 27 are joined to the gusset plates 45a, 45b by the pins 43 via the friction joining structures 31a, 31b. Therefore, the joint can be mechanically completely pinned. Moreover, a junction part can be made small and cost can be reduced. Furthermore, the same effect as that of the third embodiment can be obtained, that is, a joint having excellent design properties.

Next, a fifth embodiment will be described.
FIG. 17 is a perspective view showing a friction joining structure 71 according to the fifth embodiment, and FIG. 18 is an axial sectional view of FIG.

  Note that, in the fifth embodiment, elements having the same functions as those of the friction joining structure 1 in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The friction joining structure 71 according to the fifth embodiment is the friction joining structure 1 according to the first embodiment in which the angles of the crossing surfaces of the cross-shaped members are acute angles.

  As shown in FIGS. 17 and 18, the friction joining structure 71 has a cross-shaped member 72a, and joining members 73a, 73b, 73c, 73d are provided on the crossing surfaces of the cross-shaped member 72a.

At the ends of the joining members 73a, 73b, 73c, 73d, a plate-like connecting part 79 is provided as a pin joining part, and the connecting part 79 connects the joining members 73a, 73b, 73c, 73d.
The connecting portion 79 is provided with a clevis 76, and the clevis 76 is provided with a pin insertion hole 78.

The connecting portion 79 and the clevis 76 are members corresponding to the connecting portion 37a in the third embodiment, and the pin insertion hole 78 is a member corresponding to the pin insertion port 39a in the third embodiment.
A steel pipe 80 is connected to the end of the cross-shaped member 72a.

Here, as shown in FIG. 18, the angle 75 formed by the crossing surfaces of the cross-shaped member 72a is an acute angle.
Thus, by making the angle 75 an acute angle, the angle 10 shown in FIG. 5 can be further reduced as compared with the first embodiment.

  For example, in the first embodiment, the angle formed by the surfaces intersecting each other is 90 °, and the apparent friction coefficient is about 1.4 times that in the case where the planes are brought into contact with each other. When it is set to °, the apparent coefficient of friction is about twice that of the case where the flat surfaces are brought into contact with each other.

  Therefore, the apparent friction coefficient can be further increased, and the friction joining structure 71 can be further reduced in size.

  The cross-shaped member 72 a is formed by providing a steel round bar or a groove having an angle 75 on the side surface of the square bar.

  As described above, according to the fifth embodiment, the friction joining structure 71 includes the cruciform member 72a and the joining members 73a, 73b, 73c, and 73d provided so as to contact the crossing surfaces of the cruciform member 72a. The joining members 73a, 73c and joining members 73b, 73d that are not adjacent to each other among the joining members 73a, 73b, 73c, 73d are fastened by high-strength bolts.

  Accordingly, the same effects as those of the first embodiment are obtained.

Further, according to the fifth embodiment, the angle 75 formed by the intersecting surfaces of the cruciform member 72a is an acute angle.
Therefore, the apparent friction coefficient can be further increased, and the friction joining structure 71 can be further reduced in size.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

The perspective view which shows the friction joining structure 1 Is a view in the direction of arrow A in FIG. The perspective view which shows the joining member 3a of FIG. BB sectional view of FIG. Enlarged view of the vicinity of the joining member 3a in FIG. Side view showing the structure 19 provided with the friction bonding structures 1a and 1b FIG. 6 is a perspective view of the vicinity of the friction joining structure 1a of FIG. The figure which shows the gusset plate 25a of FIG. The perspective view which shows the other Example of the striation 27 of FIG. The perspective view which shows the friction joining structure 31 10 is an exploded perspective view of FIG. Top view showing clevis-like member 33a D direction view of FIG. 10 Side view showing the structure 41 provided with the friction bonding structures 31a and 31b 14 is a perspective view of the vicinity of the friction bonding structure 31a of FIG. Exploded perspective view of FIG. The perspective view which shows the friction joining structure 71 Axial sectional view of FIG.

Explanation of symbols

1 ………… Friction joining structure 2a ………… Cross-shaped member 3a ………… Joining member 5a ………… High strength bolt 7a ………… High strength bolt 19 ……… Structure 25a …… Gusset plate 27 ………… Streaks 31 ..... Friction joint structure 33a ... Clevis-like member 37a ... Connecting part 41 ... ... Structure 43 ... ... Pin 45a ... Gusset plate 51 ... ... Friction joint structure 53a ... Joining member 57 ... ...... Protrusions 61... Friction joining structure 63 a .. Joining member 65 a... Projection 67 a ....... Groove 71... Friction joining structure 72 a.

Claims (4)

A first member having a substantially cross-shaped cross section;
Four joining members each provided so as to contact two surfaces of the first member intersecting each other;
Fastening means for fastening the joining members provided at positions not adjacent to each other at the corners formed by the cross among the joining members, through the first member;
Comprising
A friction joining structure characterized in that the first member and the joining member are joined by a frictional force generated between the first member and the joining member. The joining member has two joining members provided at positions adjacent to each other at an angle formed by the cross, or an end of the four joining members opposite to the side to be joined to the first member. The connected end portions are formed in one or a plurality of substantially plate-like shapes, and have a pin joint portion having a first pin insertion hole,
An attachment member having a second pin insertion hole formed in one or a plurality of substantially plate-like shapes corresponding to the pin joint portion, and penetrating the first pin insertion hole and the second pin insertion hole. And pins provided
Further comprising
The friction joining structure according to claim 1, wherein the connected end portions of the joining members are joined by the pins.   The friction joining structure according to claim 1, wherein the fastening means is a high strength bolt.   The friction joining structure according to claim 1, wherein the joining member has a protrusion on a surface in contact with the first member.

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