JP2001040764A - Threaded hardware and high strength bolt joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide threaded hardware and high strength bolt joint structure facilitating the formation of a tool engaging part of the threaded hardware and the engagement of a tool without forming a special hole for alignment and retention and free from the action of locally concentrated bending force even if bending force is applied to the bolt. SOLUTION: A plug nut 3 has a threaded hole part 10 on one side of an axial hole 9, and a hexagonal large-diameter hole part 11 larger than the threaded hole part 10, on the other side. The plug nut 3 is fitted thread-fastened into a threaded hole 6 of a rectangular steel pipe column 1, and a bolt 4 is thread-fastened to the threaded hole part 10 of the plug nut 3 through a bolt through-hole 7 of an end plate 2 and the large-diameter hole 11 of the plug nut 3, to joint the column 1 and the end plate 2 by the high strength bolt 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw hardware and a high strength bolt joining structure.

[0002]

2. Description of the Related Art For example, as shown in FIG.
There are (a) and (b). In this high-strength bolt joint structure, a screw hole 56 having a diameter larger than the threaded portion of the bolt 54 is provided on the side surface of the square steel tubular column 51.
A nut member 53 as a screw is attached by screwing a screw portion 58 formed on the outer periphery of the nut member 53 from the outside of the square steel pipe column 51, and a bolt 54 is inserted through a bolt through hole 57 of the end plate 52. The screw 53 is screwed into the screw hole 60 and tightened.
2 is joined with a high-strength bolt.

[0003]

However, in the above-described high-strength bolted joint structure, when a large force acts on the end plate 52 and the column 51 in a direction away from each other due to an earthquake or the like, FIG. As shown in ()), the wall surface of the rectangular steel tube column 51 is deformed outwardly convex, and accordingly, the nut member 53 tries to change its direction.
4 acts on the nut member 53, and locally concentrated refractive power acts on the protruding base end 54a of the bolt 54 in the nut material 53.
There is a problem that the bolt 54 may be damaged, its proof strength may be reduced, and eventually the proof strength of the joint may be reduced.

[0006] As a method of maintaining the alignment when joining the end plate 52 and the column 51, separately provided holes 61 and 62 are formed in the end plate 52 and the column 51, as shown in FIG. The holes 61 and 62 are inserted into the holes 61 and 62 to hold the holes 61 and 62 in alignment with each other, thereby positioning the column 51 and the end plate 52 in an appropriate positional relationship. Although there is a method, it is necessary to separately form the holes 61 and 62 between the square steel tube column 51 and the end plate 52, and there is a problem that the processing is troublesome.

Further, in the above-mentioned high-strength bolt joining, a method of screwing the nut member 53 into the screw hole 60 of the column 51 from outside the rectangular steel tube column 51 and setting the annular member of the nut member 53 with a tool engagement. A method is adopted in which a tool is engaged with the engagement recess 66 and the tool is rotated. The engagement recess 66 is formed in an annular end face eccentric from the axis of the nut material 53. , The processing is troublesome. In addition, the size of the recess 66 that can be formed on the annular end face is naturally limited,
It is rather cumbersome to engage with the, and it is necessary to prepare a special tool.

The present invention has been made in view of the above-mentioned conventional problems, and is intended to be applied to a bolt even when a large tensile force acts in a direction in which the members are separated from each other at a joint portion between the members so that the bolt is bent. It is possible to alleviate the action of localized concentrated refracting power and prevent a decrease in proof stress, and to easily perform centering and holding of members at the time of joining without separately forming a hole for the member. Can, in addition,
A screw fitting and a high-strength bolt joining structure capable of easily forming a tool engaging portion provided on a screw fitting and enabling a tool to easily engage with a tool engaging portion of the screw fitting. Make it an issue.

[0007]

The object of the present invention is to provide a shaft hole having a screw hole on one side in the axial direction.
The other side is a large-diameter hole having a larger cross-sectional size than the screw hole, the large-diameter hole is opened to the end, and the bolt is screwed into the screw of the screw hole through the large-diameter hole. And a screw member attached to the first member, and the bolt is passed through a bolt through hole of the second member and a large-diameter hole portion of the screw member.
The problem is solved by a high-strength bolt joint structure in which the first member and the second member are joined by a high-strength bolt by being screwed and fastened to a screw hole of the screw hardware.

That is, the bolt is screwed into the screw hole of the shaft hole of the screw through the large-diameter hole, and the large-diameter hole has a larger cross-sectional size than the screw hole. A space is formed between the inner peripheral surface surrounding the large-diameter hole and the outer peripheral surface of the bolt. For this reason, even if the screw hardware tries to change the direction by applying a large tensile force in the direction of separating the members to the joint portion between the members and the bending is applied to the bolt, the bolt applies this bending to the above. By utilizing the space of the bolt, it can be dispersed and received over a wide range in the longitudinal direction, so that the localized concentrated refractive power acting on the bolt can be alleviated, and the bolt and the joint can be removed. A decrease in proof stress can be prevented.

In addition, since the screw hardware is provided with a large-diameter hole having such a function, even if the member to which the screw hardware is attached is thin, the screw hardware is sufficient. A screw hole having a length and a large-diameter hole having a sufficient length can be provided, so that a firm screw coupling force and a sufficient relaxation of localized concentrated refracting power to bending can be achieved. .

In the shaft hole of the screw, the large-diameter hole is provided on the side where the bolt is inserted, that is, on the side of the second member provided with the bolt through hole, ie, on the joint surface side between the members. Therefore, the bolt through hole of the second member is used as a hole, and the large-diameter hole of the screw hardware integrally attached to the first member is used as a hole. By inserting, the members can be held in a centered state, and there is no need to separately form a hole, and centering and holding can be performed easily.

The above screw has a screw portion on its outer periphery, and the screw is screwed into a screw hole having a diameter larger than that of a high-strength bolt provided in the first member. If it is of a structure that can be integrally attached to the member,
In such a high-strength bolt joint structure of a specific structure,
The above-described problems can be solved and the above-described effects can be obtained.

In the above screw hardware, when the cross-sectional shape of the large-diameter hole portion is an irregular shape other than a perfect circle, the tool is engaged with the large-diameter hole portion as a tool engagement portion, and the tool is rotated. The screw hardware can be screwed into the screw hole of the first member. Since there is only one tool engaging portion on the shaft of the screw, machining is easy, and a large-sized tool engaging portion can be obtained, so that the tool can be easily engaged. Can be. In addition, it is possible to make the shape of the tool engaging portion engageable with a conventional tool, and in such a case, it is possible to eliminate the necessity of preparing a special dedicated tool.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings.

In the high-strength bolted joint structure shown in FIGS. 1 and 2, reference numeral 1 denotes a square steel tubular column as a first member, 2 a beam end plate as a second member, and 3 a nut material (hereinafter referred to as a screw member). , 4) are bolts. 5 is a washer.

The rectangular steel column 1 has bolts 4 on its side walls.
A plurality of screw holes 6 having a diameter larger than that of the male screw portion are provided. Some or all of the screw holes 6 are provided at positions eccentric to the side from the center in the width direction of the side surface of the column 1 as shown in the drawing.

The end plate 2 is provided with through holes 7 through which the bolts 4 pass, corresponding to the screw holes 6 of the column 1.

The plug nut 3 has a screw portion 8 on the outer periphery thereof, which can be screwed into the screw hole 6 of the column 1. The outer thread 8 is formed over the entire length of the plug nut 3.

The plug nut 3 is provided with a shaft hole 9. The shaft hole 9 is opened at both ends of the plug nut 3, and one side thereof is formed as a screw hole 10 which can be screwed with the bolt 4.
The other side is a large-diameter hole portion 11 having a diameter larger than that of the screw hole portion 10, and an annular step portion 12 facing the inside of the large-diameter hole portion 11 is formed at a boundary between the hole portions 10 and 11. ing.

The plug nut 3 has a sufficient length in the screw hole 10 to screw the bolt 4 and a sufficient length in the large diameter hole 11 to exert its function. In the illustrated embodiment, the overall length is greater than the wall thickness of the rectangular steel tubular column 1. It goes without saying that the entire length of the plug nut may be equal to or smaller than the wall thickness dimension of the rectangular steel tubular column.

The large-diameter hole 11 has a hexagonal cross-sectional shape, and is used to connect the plug nut 3 to the screw hole 6 of the square steel tube column 1.
It functions as a tool engagement portion when screwed into the device.

For joining the end plate 2 with the high-strength bolt to the square steel pipe column 1, first, the plug nut 3 is connected to the square steel pipe column 1.
Screw holes 6 and attached to the column 1. In this installation, the plug nut 3 is screwed into the screw hole 6 from outside the rectangular steel tubular column 1 with the large-diameter hole portion 11 facing backward. As shown in FIGS. 5A and 5B, the screw 13 is screwed into the large-diameter hole 1 of the plug nut 3 as shown in FIGS.
This can be performed by rotating the tool 13 in the state of being inserted in the first position. The insertion of the tool 13 into the large-diameter hole portion 11 of the plug nut 3 is much easier than in the case of the conventional structure, and the tool 13 can be firmly engaged with the plug nut 3. The screwing of the plug nut 3 into the screw hole 6 can be performed stably. Processing of the large-diameter hole portion 11 functioning as such a tool engagement portion is also easy.
The screwing is performed until the rear end surface of the plug nut 3 is flush with the outer surface of the rectangular steel tube column 1 or is slightly inserted into the screw hole of the column 1.

Then, the end plate 2 is connected to the square steel tubular column 1.
As shown in FIG. 4, one or several of the bolt through holes 7 of the end plate 2 are formed as holes, and a square steel pipe corresponding to the hole 7 is formed. The large-diameter hole portion 11 of the plug nut 3 of the column 1 is used as a hole, and a shirashi 14 is inserted into these holes 7 and 11, and the shir holes 7 and 11 are connected to each other at the shih 14. The end plate 2 is held in a centered state, and thus each bolt through hole 7 of the end plate 2 is held in a centered state with the corresponding plug nut 3 of the square steel tube column 1. In the plug nut 3, a step 14 at the boundary between the screw hole 6 and the large-diameter hole 11 is formed.
By making the tip of the
The reed 14 does not damage the screw hole 10 of the plug nut 3.

Thereafter, as shown in FIGS. 1 and 2, the bolt 4 is passed through the bolt through hole 7 of the end plate 2 where the sill 14 is not fitted, and further the diameter of the plug nut 3 of the square steel tubular column 1 is increased. It is screwed into the screw hole 10 of the plug nut 3 through the large hole 11 and tightened. Finally, the shino 14 is removed, and the bolt 4 is attached thereto.

As described above, the beam end plate and the square steel tube column 1 are frictionally joined to each other, and a high-strength bolt joint structure is formed. In this high strength bolt joint structure,
A space portion 15 is formed between the bolt 4 and the inner peripheral surface surrounding the large-diameter hole portion 11 of the plug nut 3.

In the above-mentioned high-strength bolted structure, a large tensile force acts in the direction of separating the rectangular steel tube column 1 and the end plate 2 due to an earthquake or the like, as shown in FIG. Bolt 4
Even if a bend is applied to the bolt 4, the bolt 4
Utilizing the space portion 15 described above, the bolts 4 can be dispersed and received in a wide range in the length direction. Therefore, it is possible to alleviate the locally concentrated refractive power acting on the bolt 4 as in the related art. As a result, it is possible to prevent the strength of the bolts 4 and the joints from decreasing.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the invention. For example, in the above embodiment, the case where the square steel tubular column 1 and the beam end plate 2 are joined is shown. However, the present invention is not limited to this, and may be widely used for joining various members. In the above-described embodiment, the plug nut 3 having a specific structure is shown as the screw metal of the present invention. For example, a screw metal having a threaded portion only in a part of the outer circumferential length direction may be replaced with a square steel pipe column. 1 may be screwed into the screw hole 6 of the column 1 and attached. Alternatively, the screw may be structured so as not to have a screw on its outer periphery. You may make it attach by other methods. Also, as described above, the screw may not be attached from the side of the frictional joint surface between the members, and specifically, may be configured to be attached from the inside of the rectangular steel tube column 1. Good. Further, in the above-described embodiment, the large-diameter hole portion 11 of the plug nut 3 is a hexagonal cross section as the tool engagement portion, but may be a quadrangle, a triangle, or another polygon. Needless to say, various shapes other than a perfect circle that cannot be engaged in the rotation direction, such as an elliptical cross, may be employed. In addition, the present invention cites, as its operation and effect, the resistance to bending, the function of a hole for a hole, and the function of engaging a tool. However, the present invention is configured to have at least one of these effects. It should just be.

[0027]

As described above, since the present invention has the above-mentioned structure, the bolt is bent by applying a large tensile force in the direction of separating the members at the joint between the members. In this case, it is possible to alleviate the localized concentrated refractive power acting on the bolt, prevent the reduction of the proof stress, and maintain the alignment of the members when joining. Without separately forming holes
It can be done easily. Further, the tool engaging portion provided on the screw can be easily formed, and the tool can be easily engaged with the tool engaging portion of the screw.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment, and FIG. 1A is a plan sectional view of a joint between a column and a beam end plate, and FIG. 1B is an enlarged view of a main part of FIG.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 shows a state in which a force is applied. FIG. 3 (a) is a plan sectional view of a joint between a column and a beam end plate, and FIG. 3 (b) is an enlarged view of a main part of FIG. 3 (a). .

4A and 4B show a method of attaching a shino, wherein FIG. 4A is a cross-sectional view before mounting, and FIG. 4B is a cross-sectional view after mounting.

FIGS. 5A and 5B are perspective views each showing a method of attaching a plug nut.

6A and 6B show a conventional example, in which FIG. 1A is a cross-sectional plan view of a joint between a column and a beam end plate, and FIG. 2B is an enlarged view of a main part of FIG. Is a cross-sectional plan view in a state where a force is applied, and FIG. (D) is an enlarged view of a main part of FIG. (C), and FIG.
It is sectional drawing which shows the attachment method of a ladder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Square steel pipe column (1st member) 2 ... End plate (2nd member) 3 ... Plug nut (Screw hardware) 4 ... Bolt 6 ... Screw hole 7 ... Bolt through hole 8 ... Screw part 9 ... Shaft hole 10 ... Screw hole 11 ... Large diameter hole 13 ... Tool 14 ... Shino 15 ... Space

Claims (5)

[Claims] 1. An axial hole having a screw hole on one side in the axial direction and a large-diameter hole having a larger cross-sectional size than the screw hole on the other side. A screw fitting characterized in that the large hole is opened to the end and the bolt is screwed into the screw in the screw hole through the large diameter hole. 2. The screw hardware according to claim 1, which has a screw portion on an outer periphery. 3. The screw according to claim 2, wherein the cross section of the large-diameter hole is a shape other than a perfect circle. 4. The screw member according to claim 1, wherein the screw member is attached to the first member, and the bolt includes a bolt through hole of the second member and a large-diameter hole portion of the screw member. Wherein the first member and the second member are joined by a high-strength bolt by being screwed and tightened into a screw hole of the screw hardware. 5. A screw hole having a diameter larger than that of a high-strength bolt is provided in a first member, and the screw metal according to claim 2 is screwed into the screw hole of the first member. The bolt is screwed into the screw hole of the screw through the bolt hole of the second member and the large-diameter hole of the screw, and the first bolt is tightened. A high-strength bolt joint structure, wherein the member and the second member are joined by high-strength bolts.