JP2015034397A - Friction joint structure for high-strength bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable obtainment of stable strength by stably securing a between-materials compressive force distribution range, while enabling enlargement of a movable range of steel plates for being joined to each other, by enlarging a positioning range of a high-strength bolt.SOLUTION: A friction joint structure for a high-strength bolt joins two steel plates 3 (3A and 3b) together. Bolt holes opened in the two steel plates 3A and 3b to be joined together are formed as slots 31 and 32. The slots 31 and 32 of the respective steel plates 3A and 3b overlap each other in such a manner as to be orthogonal to each other in a major-axis direction. The high-strength bolt 2 is inserted through a crossing part, in which the slots 31 and 32 overlap each other, via a washer 4 and fastened.

Description

  The present invention relates to a friction bonding structure for high-strength bolts.

  Conventionally, when using excessive holes in friction welding of high-strength bolts, in the case of joints using accessory plates on both sides of the intermediate plate, excessive holes are formed in the intermediate plate, and the accessory plate is a standard hole. Is common. For example, when the nominal diameter d of the high-strength bolt is d ≦ 22 mm, the oversized hole has a hole diameter of up to d + 4 mm, and when a single structural steel material is used, the yield strength reduction coefficient is 0.85. Further, when the middle plate is a long hole, when the major axis is within 2.5d and the stress direction is other than orthogonal, the yield strength reduction factor is generally set to 0.7. It is also stipulated in the “Design Guidelines for Architectural Design”

  In addition, in the bolt joining, the excessive holes opened in the two thin plates are relatively shifted, the thin plate is tightened with a bolt, and the plate in the peripheral portion of the hole is pushed into the bolt hole, so that the relative shift described above is achieved. The suppression is described in, for example, Patent Document 1.

  In Patent Document 1, in addition to the above-described method, the joint portion of the thin plate material is sandwiched and opposed, between the convex portion and the concave portion of the washer that forms the inclined surface, or the convex portion of the high-strength bolt head that forms the inclined surface. And the washer or the concave part of the joint metal that also serves as a washer, the joint of the thin sheet material sandwiched is pushed in with the fastening force of high strength bolts and nuts to create a deformed part in the out-of-plane direction on the deformed sheet material. A high-strength bolt joint structure that reinforces the joint strength is disclosed by restraining the movement of the thin plate material in the out-of-plane direction with a washer, a high-strength bolt, or a joint metal.

Japanese Patent No. 4805189

However, the conventional high-strength bolt friction joint structure has the following problems.
In other words, in the conventional case, if the steel plates having oversized holes are friction-joined, the joining is performed via the standard plate, so that a simple friction-joined part that directly bolts thin steel plates together In this case, the number of parts increases and the cost increases. In addition, if oversized holes cannot be used for simple friction joints between thin steel plates, high construction accuracy is required. There was a problem that there was. On the other hand, when a washer of a high-strength bolt is brought into direct contact with the excessive hole, the contact area between the washer and the steel plate is small, so that a particularly thin steel plate may crush the portion where the washer abuts.

  In the case of Patent Document 1, if the washer and the bolt hole are concentric, there is a problem that the washer is pressed into the bolt hole unless the washer diameter is considerably increased.

  The present invention has been made in view of the above-described problems. The position adjustment range of the high-strength bolts can be increased, and the movable range of the steel plates to be joined can be widened. An object of the present invention is to provide a friction joint structure for a high-strength bolt capable of obtaining a stable proof stress by stably securing a contact area.

  In order to achieve the above object, the high-strength bolt friction joint structure according to the present invention is a high-strength bolt friction joint structure in which steel plates having a thickness of 1/2 or less of the nominal diameter of the bolt are overlapped and joined. In the two steel plates to be joined, the bolt holes opened in each are formed into long holes, and the long holes of each steel plate are overlapped so that the major axis directions are orthogonal to each other, The high-strength bolt is inserted and fastened through a washer at the intersection.

  Moreover, in the high strength bolt friction joint structure according to the present invention, the high strength bolts that join the steel plates having a thickness of 1/2 or less of the nominal diameter of the bolts, but are overlapped with each other and joined together. In the friction joining structure, the two steel plates to be joined are each formed such that a bolt hole opened in each is formed into a long hole, and the long holes of each steel plate are orthogonal to each other in the major axis direction, Or, in the superposed portion corresponding to each of the two steel plates in the accessory plate, a bolt hole opened in each is formed into a long hole, and the accessory plate has long holes in the superposed portions. The two steel plates are overlapped so that the major axis directions are orthogonal to each other, and the high-strength bolt is inserted into the elongated hole via a washer and fastened.

  In the high-strength bolt friction joint structure according to the present invention, the contact area of the washer with the steel plate is always symmetrical with respect to the major axis of the long hole and is more than a fixed value compared to the concentric oversized hole. Can be secured. In particular, a thin steel plate having a bolt nominal diameter of ½ or less has a small inter-material compressive force distribution range. Therefore, securing a contact area of a certain level or more can effectively realize a friction bonding structure having long holes. it can.

  In the present invention, since the major axis direction of the elongated holes of the two steel plates or the overlapping portions of the laminated plates are orthogonal, the position adjustment range of the high strength bolt can be increased, and the movable range of the steel plates Can be secured widely in the XY2 direction. Therefore, it becomes possible to ease the construction accuracy of the two steel plates to be joined, and the construction efficiency can be increased.

  Moreover, in the high-strength bolt friction joint structure according to the present invention, a sandwich plate having a circular hole may be interposed between the steel plates.

  In the present invention, it is possible to adjust the distance (height) between the two steel plates to an appropriate size by adjusting the thickness dimension of the sandwiching plate. An XYZ 3-axis position adjustment mechanism can be provided in the part. Therefore, the construction accuracy on the steel sheet side can be further reduced, and the construction efficiency can be improved.

  In the high strength bolt friction joint structure according to the present invention, it is more preferable that the outer diameter of the washer exceeds 2.5 times the nominal diameter of the bolt.

  In this case, because the washer has a large diameter, it is possible to prevent the bolt hole (long hole) from being crushed by the washer. Friction joints can be used. Thereby, the use of a conventional accessory plate can be omitted, and an increase in the number of components can be suppressed.

  Moreover, in the high-strength bolt friction joint structure according to the present invention, the thickness of the washer is preferably 0.35 times or more the nominal diameter of the bolt.

  In this case, deformation caused by increasing the diameter of the washer can be suppressed, which is more effective.

  In the friction joint structure for high strength bolts according to the present invention, the steel plate is preferably a galvanized steel plate.

  With the high-strength bolt friction joint structure configured as described above, corrosion resistance can be ensured, and reduction of slip resistance due to the long hole can be suppressed.

  Moreover, in the high-strength bolt friction joining structure according to the present invention, it is preferable that the friction surface of the steel plate is subjected to a phosphate treatment.

  In the friction joint structure of the high strength bolt of the present invention, a stable slip coefficient can be secured on the friction surface when the steel plate is a galvanized steel plate.

  According to the friction joint structure of the high strength bolt of the present invention, the position adjustment range of the high strength bolt can be increased, and the movable range between the steel plates to be joined can be widened, while the contact area between the steel plate and the washer is increased. By ensuring the stability, there is an effect that a stable yield strength can be obtained.

It is a partially broken side view showing the bolted joint structure according to the first embodiment of the present invention. It is the partially broken side view seen from the direction which shifted the bolt joining structure of Drawing 1 90 degrees by plane view. It is a top view of a bolt joining structure. It is a perspective view which shows the state before joining two steel plates. (A)-(c) is a figure for demonstrating the basis of a washer diameter and a washer thickness. It is a partially broken side view which shows the bolt joining structure by a 1st modification, Comprising: It is a figure corresponding to FIG. FIG. 7 is a plan view of the bolt joint structure shown in FIG. 6, corresponding to FIG. 3. It is a partially broken side view which shows the bolt joining structure by 2nd Embodiment. It is a top view before joining of the steel plate shown in FIG. FIG. 9 is a plan view of the bolt joint structure shown in FIG. 8, in which a high-strength bolt is omitted. It is a figure which shows the bolt joining structure by a 2nd modification, Comprising: It is a top view before joining of a steel plate and a accessory board. FIG. 12 is a plan view of the bolt joint structure shown in FIG. 11 and corresponds to FIG. 10. FIG. 13 is a plan view of a bolt joint structure according to a third modification, corresponding to FIG. 12.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a high strength bolt friction joint structure according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIGS. 1 to 3, the high-strength bolt friction joint structure (hereinafter simply referred to as “bolt joint structure 1”) of the first embodiment includes two steel plates 3 (3 </ b> A, 3 </ b> B). The bolt holes opened in the two steel plates 3A and 3B to be joined are formed in the long holes 31 and 32, and the long holes 31 and 32 are directly overlapped with each other. A configuration in which the major axis directions X and Y of each other (see FIG. 4) are arranged orthogonal to each other, and the high-strength bolt 2 is inserted and fastened through the washer 4 at the intersecting portion where the long holes 31 and 32 overlap each other. It has become.

  The two steel plates 3A and 3B are in contact with each other in an overlapping manner, and each has a plate thickness t1 that is 1/2 or less of the nominal diameter of the high strength bolt 2. And the steel plate 3 which has the elongate hole 31 (or 32) consists of a galvanized steel plate, and the friction surface 3a is phosphate-processed over the whole surface.

  As shown in FIG. 3, the washer 4 has an outer diameter that exceeds 2.5 times (2.5d) the bolt nominal diameter d (see FIG. 5 (a)) (≧ 2.5d), and a washer thickness t2 ( 1) is set to 0.35 times or more (t2 ≧ 0.35d) of the bolt nominal diameter d. Although the washer 4 is circular, it may be rectangular. In the case of a rectangle, the diameter of the inscribed circle may be 2.5 times.

As shown in FIG. 5A, when the bolt hole is a circular hole, when the nominal diameter d of the high strength bolt 2 is 16 mm, the bolt hole diameter Dh is 18 mm, and the washer outer diameter Do is 32 mm, the washer 4 is The first contact area A1 in contact with the steel plate 3 is 550 mm ² .

On the other hand, as shown in FIG. 5B, in the case where the bolt hole is a long hole 31 (32) as in the present embodiment, the minimum contact is assumed when the long hole 31 (32) is assumed to be infinite. It becomes an area, and the proof stress beyond this (a certain level or more) can be secured stably. This minimum contact area is cos θ = Dh / Do. When the nominal diameter d of the high-strength bolt 2 is 16 mm, the bolt hole diameter is 18 mm, and the washer outer diameter Do is 40 mm, the second contact area A2 is 562 mm ² (≈first contact area A1). As a result, the washer outer diameter Do is 40 mm and the second contact area A2 and the first contact area A1 are substantially the same. As shown in FIG. 5C, the washer outer diameter Do of 40 mm is the bolt nominal diameter d = 16 mm. 2.5 times as much.

  And as shown in FIG.5 (c), when the nominal diameter d of the high strength volt | bolt 2 is 16 mm, the thickness of the washer 4 is compared with the thickness of the conventional washer usually 4.5 mm (0.28 d). In the embodiment, it is 6 mm (0.35 d or more). The diameter (Dn) of the surface where the nut 2A for the nominal diameter d of the high-strength bolt 2 is 16 mm contacts the washer 4 is usually 25 mm, and the length L of the free end of the washer 4 increases the outer diameter of the washer 4. Therefore, it is 7.5 mm, which is longer than the length of the conventional washer (= 3.75 mm). Therefore, in the washer 4 of the present embodiment, the thickness is increased in order to prevent deformation, and the rigidity of the conventional washer is approximately twice ((6.0 / 4.5) ^ 3). Yes.

Another reason why the thickness of the washer 4 is 0.35 times the nominal diameter of the high-strength bolt 2 will be described.
For example, assuming that stress is transmitted in a direction of about 55 degrees, the required thickness of the washer 4 is 5.3 mm. At this time, the thickness of the washer 4 is 0.33 which is the nominal diameter of the high strength bolt 2. Therefore, if the thickness of the washer 4 is 0.35 times the nominal diameter of the high-strength bolt 2, the desired strength can be ensured. The transmission angle of 55 degrees is an angle with a margin of 5 degrees added to reliably cover 40 degrees to 50 degrees, which is said to be a general transmission angle.

Next, the effect | action of the bolt junction structure 1 mentioned above is demonstrated in detail based on drawing.
As shown in FIG. 5B, in the bolted joint structure of the present embodiment, the contact area S of the washer 4 with the steel plates 3A and 3B is smaller than the long axis of the long holes 31 and 32, compared to the concentric excessive holes. Therefore, stable joining performance can be ensured, and the washer 4 has a large diameter, so that it is possible to prevent the steel plate 3 from being recessed into the long hole portion. In particular, a thin steel plate 3 having a bolt nominal diameter of ½ or less has a small inter-material compressive force distribution range. Therefore, securing a contact area of a certain level or more is effective for the bolt joint structure 1 having the long holes 31 and 32 opened. Can be realized.

  Moreover, in this Embodiment, as shown in FIG. 3, since the long diameter direction XY of the long holes 31 and 32 of the two steel plates 3A and 3B is orthogonal, the position adjustment range of the high strength bolt 2 is increased. The movable range of the steel plates 3A and 3B can be secured widely in the XY2 direction. Therefore, the construction accuracy on the two steel plates 3A and 3B to be joined can be relaxed, and the construction efficiency can be increased.

  Further, in the bolt joint structure 1, the outer diameter of the washer 4 is larger than 2.5 times the nominal diameter of the bolt, thereby suppressing the collapse of the bolt holes (long holes 31 and 32) by the washer 4. Therefore, the high-strength bolt friction joint can be used also in the case of the long holes 31 and 32 as in the present embodiment. In addition, the use of a conventional accessory plate can be omitted, and an increase in the number of components can be suppressed.

  In the present embodiment, the thickness of the washer 4 is 0.35 times the nominal diameter of the bolt or more, so that deformation caused by increasing the diameter of the washer 4 can be suppressed. Can be increased.

  Furthermore, in the bolted joint structure 1 of this Embodiment, since the steel plate 3 is a galvanized steel plate, corrosion resistance can be ensured and the reduction in slip strength due to the long holes 31 and 32 can be suppressed.

  Furthermore, in the bolt joint structure 1 of the present embodiment, since the phosphate surface is applied to the friction surface of the steel plate 3, a stable slip coefficient can be secured on the friction surface of the steel plate 3.

  In the bolted joint structure 1 of the present embodiment, by increasing the position adjustment range of the high-strength bolt 2, while extending the movable range during construction of the two steel plates 3A and 3B to be joined, By stably securing the contact area between the open steel plate 3 and the washer 4, there is an effect that a stable proof stress can be obtained.

As another form of the first embodiment, for example, a bolt joint structure 1A (friction joint structure of high-strength bolts) according to a first modification shown in FIGS. It is good also as a structure by which the clamping board 5 which has the circular hole 51 is inserted.
In this case, by adjusting the thickness dimension of the sandwiching plate 5, it becomes possible to adjust the distance (height) between the two steel plates 3 </ b> A, 3 </ b> B to an appropriate dimension. An XYZ triaxial position adjusting mechanism can be provided at the joint between the steel plates 3A and 3B. Therefore, the construction accuracy on the steel plate 3 side can be further relaxed, and the construction efficiency can be improved. As with the washer 4, the size of the sandwiching plate is preferably 0.35d or more and the outer diameter (of the inscribed circle) is preferably 2.5d or more, and may be circular. When the two steel plates 3A and 3B are galvanized steel plates, the sandwich plate 5 is preferably a galvanized steel plate, and the surface treatment is preferably a phosphate treatment.

(Second Embodiment)
Next, a high-strength bolt friction joint structure according to a second embodiment will be described with reference to FIGS.
In the first embodiment described above, the steel plates 3A and 3B having a thickness of ½ or less of the nominal diameter of the bolt are overlapped and joined to each other, but the bolt joining structure 1B according to the second embodiment ( In the high-strength bolt friction joining structure), the steel plates 3A and 3B having a thickness of 1/2 or less of the nominal diameter of the bolt are brought into contact with each other, and the accessory plate 6 is overlapped and joined to both the steel plates 3A and 3B. is there.

  The two steel plates 3A and 3B to be joined have bolt holes opened in the long holes 31 and 32, respectively, and the long holes 31 and 32 of the steel plates 3A and 3B are orthogonal to each other in the major axis direction. Is arranged. The bolt hole of the accessory plate 6 is formed in a circular hole 61. And the high strength volt | bolt 2 is inserted through the long holes 31 and 32 of each steel plate 3A, 3B and the circular hole 61 of the accessory plate 6 via the washer 4A, 4B, and is fastened.

  Here, the second washer 4B located on the long holes 31 and 32 side has a larger diameter and a thicker member than the first washer 4A located on the circular hole 61 side of the accessory plate 6. As with the washer 4 of the first embodiment described above, the second washer 4B has an outer diameter that exceeds 2.5 times the nominal diameter of the bolt and a washer thickness that is set to 0.35 times or more the nominal diameter of the bolt. The effect is the same as that of the first embodiment.

  In this case, as shown in FIG. 10, since the major axis directions of the long holes 31 and 32 of the steel plates 3A and 3B are orthogonal to each other, the movable range of the steel plates 3A and 3B can be secured widely in the XY2 direction. Therefore, it becomes possible to ease the construction accuracy of the two steel plates to be joined, and the construction efficiency can be increased.

  Further, as another form of the second embodiment, for example, the two steel plates 3A and 3B in the accessory plate 6 can be individually handled as in the bolt joint structure 1C according to the second modification shown in FIGS. In the superposed portions 6a and 6b (two-dot chain line portions in FIG. 11), bolt holes are formed in the long holes 62 and 63, respectively, and the accessory plate 6 is a long hole in each superposed portion 6a and 6b. 62 and 63 are superposed on two steel plates 3A and 3B having bolt holes formed in the circular hole 33 so that the major axis directions thereof are orthogonal to each other. And this bolt joining structure 1C is good also as a structure by which the high strength volt | bolt was penetrated through the long holes 62 and 63 of the accessory plate 6, and the circular holes 33 of the steel plates 3A and 3B through a washer, and was fastened.

  In this case, in addition to obtaining the same effect as the bolt joint structure 1B according to the second embodiment described above, for example, as shown in FIG. 13, the width W of the accessory plate 6A (the butt direction of the steel plates 3A and 3B) The length dimension in the direction perpendicular to the second plate) is made wider than that of the accessory plate 6 of the second modification described above, or the thickness of the accessory plate 6 is increased so that the two sheets of the second embodiment described above are obtained. There is an advantage that the effective cross section can be increased as compared with the structure in which the long holes 31 and 32 are provided on the steel plates 3A and 3B side.

  As mentioned above, although the embodiment of the friction joining structure of the high strength bolt according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist thereof.

1, 1A, 1B, 1C, 1D Bolt joint structure (friction joint structure of high strength bolt)
2 High-strength bolts 3, 3A, 3B Steel plates 4, 4A, 4B Washers 5 Clip plates 6 Attachment plates 6a, 6b Overlapping portions 31, 32, 62, 63 Long holes 33, 51, 61 Circular holes

Claims (7)

A friction joint structure for high-strength bolts in which steel plates having a thickness of 1/2 or less of the nominal diameter of the bolt are joined together.
In the two steel plates to be joined, bolt holes opened in each are formed into long holes,
The long holes of each steel plate are overlapped so that the major axis directions are orthogonal to each other,
The high-strength bolt friction joining structure, wherein the high-strength bolt is inserted and fastened through a washer at an intersection of the long holes.   The friction bonding structure for high-strength bolts according to claim 1, wherein a sandwich plate having a circular hole is interposed between the steel plates. A high-strength bolt friction joining structure in which steel plates having a thickness of 1/2 or less of the nominal diameter of a bolt are butted together and joined to each other by overlapping the accessory plates,
The two steel plates to be joined are each formed such that a bolt hole opened in each is formed into a long hole, and the long holes of each steel plate are mutually orthogonal in the major axis direction,
Or
Bolt holes opened in the superposed portions corresponding to each of the two steel plates in the accessory plate are formed as long holes, and the elongated holes in the superposed portions of the superposed portions of each of the superposed portions have a long diameter. Superimposed on the two steel plates so that the directions are orthogonal,
The high-strength bolt friction joining structure, wherein the high-strength bolt is inserted into the elongated hole through a washer and fastened.   4. The high-strength bolt friction joint structure according to claim 1, wherein an outer diameter of the washer exceeds 2.5 times a nominal bolt diameter.   The friction joint structure for a high strength bolt according to claim 4, wherein the washer has a thickness of 0.35 times or more of a nominal diameter of the bolt.   The friction joining structure of a high strength bolt according to any one of claims 1 to 5, wherein the steel plate is a galvanized steel plate.   The friction joint structure of a high strength bolt according to claim 6, wherein the friction surface of the steel plate is subjected to a phosphate treatment.

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