JP4053145B2 - High-strength bolt joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-strength bolt joint structure.
[0002]
[Related technologies]
For example, in the case where an end plate of an H-shaped steel beam is joined to a side surface portion of a square steel pipe column by high-strength bolts, adopting the following joining method is considered as an extremely effective joining method.
[0003]
That is, as shown in FIG. 6, a screw hole 55 having a diameter larger than that of the high-strength bolt 53 is formed on the side wall of the square steel pipe column 51, and a nut member 54 whose outer periphery is a screw portion 54 b is formed in the screw hole 55. The high-strength bolt 53 is screwed into the inner peripheral threaded portion 54a of the nut member 54 through the bolt hole 59 of the end plate 52, and tightened. This is a technique in which the square steel pipe column 51 and the end plate 52 are joined by high-strength bolts by the screw coupling forces of the nut material 54 and the square steel pipe column 51 and the high-strength bolt 53 and the nut material 54.
[0004]
According to this joining method, since the nut material 54 is set in the wall of the side wall of the square steel pipe column 51, the protrusion of the high-strength bolt 53 tip side into the square steel pipe column 51 can be suppressed to a small value.
[0005]
In addition, since the high-strength bolt 53 is screwed into the nut member 54, the bolt 53 does not come out of the nut member 54 due to the tightening of the high-strength bolt 53, and the square steel pipe column. 51 has a diameter larger than that of the high-strength bolt 53, and thus the screw length of the screw hole 55 in the spiral direction is ensured to be long. Therefore, the screw coupling portion between the nut member 54 and the square steel pipe column 51 is secured. As for the nut material 54, it is possible to obtain a tight screwed state in which it is difficult to remove the screw from the square steel pipe column 51. Therefore, the square steel pipe column 51 and the end plate 52 can be brought into a solid high-strength bolt joint state without screw removal, that is, a solid friction joint state.
[0006]
In addition, the nut member 54 may be attached to the screw hole 55 of the square steel pipe column 51 by screwing into the screw hole 55 from the outside of the square steel pipe column 51. There is no need to make any access.
[0007]
[Problems to be solved by the invention]
However, the high-strength bolt joint structure described above still has room for improvement in the following points. That is, in the process of tightening the high-strength bolt 53, the high-strength bolt 53 is configured so that the nut member 54 does not float on the frictional joint surface side between the square steel pipe column 51 and the end plate 52. Is rotated in the same direction as the rotation direction in which the screw hole 55 is screwed into the screw hole 55 and screwed into the nut member 54. Therefore, in the process of tightening the high-strength bolt 53, the nut material 54 set on the square steel pipe column 51 causes an unintentional co-rotation, leading to the depth of the screw hole 55, that is, the inside of the square steel pipe column 51. It may be displaced and the proof stress of the screw joint part between the nut material 54 and the square steel pipe column 51 may be lowered.
[0008]
The present invention solves the above problems and can effectively prevent the nut material from co-rotating in the process of tightening the high-strength bolts, and joins the members together with high strength and reliability. It is an object of the present invention to provide a high-strength bolt joint structure that can be used.
[0009]
[Means for Solving the Problems]
The above problem is that the first member is provided with a screw hole having a diameter larger than that of the high-strength bolt,
A nut member having an outer periphery as a screw portion is attached to the first member by screwing the outer periphery screw portion into the screw hole,
The high-strength bolt is screwed into the inner peripheral thread portion of the nut member through the bolt through hole of the second member and tightened, and the nut member and the first member, and each screw of the high-strength bolt and nut member The first member and the second member are joined by a high-strength bolt by the binding force,
The nut member can be installed by screwing into the screw hole of the first member from the side of the friction joint surface between the first member and the second member, and the high strength bolt is the same as the nut member. Rotated in the direction and screwed into the nut material,
The nut member has a radially outward projecting portion at a base end portion thereof, and the projecting portion is brought into contact with the peripheral edge portion of the screw hole of the first member so as to extend further into the screw hole inward. This is solved by a high-strength bolt joint structure characterized in that the screw-in is restricted.
[0010]
That is, in this high-strength bolt joint structure, even if a rotating force acting on the nut material acts in the process of rotating and tightening the high-strength bolt, the nut material has a base end protruding portion that is the first one. Since it is abutted to the peripheral edge of the screw hole of the member and further screwing is restricted, it does not happen that it rotates together with the high-strength bolt, so the nut material is unintentionally behind It is possible to reliably prevent the screw joints between the nut member and the first member from lowering the yield strength by screwing, and to join the members with high-strength bolts appropriately and firmly with high strength and reliability. be able to.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0012]
This embodiment relates to a high-strength bolt joint structure in the case where an end plate provided at the end of an H-shaped steel beam is joined to a peripheral wall outer surface of a square steel pipe column with a high-strength bolt. 1 is a square steel pipe column as a first member, 2 is an end plate as a second member, 3 is a high strength bolt with a pin tail, and 4 is a plug nut as a nut material.
[0013]
The square steel pipe column 1 is made of a structural steel material of an ordinary mild steel class, and a screw hole 5 having a diameter larger than that of a high-strength bolt 3 used for joining is formed in a side wall 1a in a penetrating state.
[0014]
The plug nut 4 has a hardness determined as a set with the high strength bolt 3, and a screw hole 4a into which the high strength bolt 3 is screwed is formed in the shaft core portion. . The plug nut 4 is designed to have a circular cross-sectional outer peripheral shape and an outer peripheral size corresponding to the size of the screw hole 5 of the square steel pipe column 1. A matable male screw 4b is formed. The plug nut 4 is screwed into the screw hole 5 from the outer side of the square steel pipe column 1, that is, the friction joint surface between the square steel pipe column 1 and the end plate 2 with respect to the screw hole 5 of the square steel pipe column 1. It is set as the structure aspect which can be attached.
[0015]
Tool engaging portions 4 c and 4 c are provided on the base end surface of the plug nut 4 for screwing the plug nut 4 from the outside of the square steel pipe column 1. In the present embodiment, a plurality of small holes 4c and 4c for rotation operation are provided in an eccentric state on the base end surface of the plug nut 4, and this is used as a tool engaging portion, and a protrusion of a rotary tool (not shown) is provided in the small holes 4c and 4c. The plug nut 4 is screwed into the screw hole 5 from the outside of the square steel pipe column 1 by inserting and rotating the rotary tool. The tool engaging portion may be in any form that allows the tool to engage with the plug nut 4 and rotate the plug nut 4 by operating the tool, in addition to those using the small holes 4c and 4c as described above. The plug nut 4 may have various forms such as a minus-shaped groove or a plus-shaped groove crossing the base end surface.
[0016]
The base end of the plug nut 4 is provided with a flange 4d that protrudes outward in the radial direction as a protrusion in the present invention, and this flange 4d is the screw hole 5 of the square steel pipe column 1. In the process of screwing the plug nut 4 into the screw hole 5, the plug nut 4 is restricted from being screwed further into the screw hole 5 by contacting the peripheral edge of the screw hole 5. Yes. In this abutting state, the screw hole 5 has an outer end portion so that the base end surface of the plug nut 4 does not protrude outward from the outer surface of the square steel pipe column 1, that is, the frictional joint surface with the end plate 2. In addition, a large flange receiving recess 6 having a predetermined depth is provided, and the flange portion 4d is received on the annular bottom surface of the flange receiving recess 6. The plug nut 4 may be set in the screw hole 5 so that the base end surface thereof is flush with the outer surface of the square steel pipe column 1. However, the plug nut 4 has a reliable frictional connection between the square steel pipe column 1 and the end plate 2. Therefore, it is preferable that the base end surface is set in a state where it slightly enters the inside of the screw hole 5 rather than the outer surface position of the square steel pipe column 1.
[0017]
The rectangular steel pipe column 1 and the end plate 2 are joined as follows. That is, as shown in FIGS. 3A and 3B, first, the plug nut 4 is screwed into the screw hole 5 from the outside of the square steel pipe column 1 to set the plug nut 4 in the square steel pipe column 1. To do. At that time, the plug nut 4 is screwed in until the flange portion 4 d comes into contact with the annular bottom surface of the flange receiving recess 6. As a result, the base end surface of the plug nut 4 is flush with the outer surface of the square steel pipe column 1 or slightly enters the inside of the screw hole 5 from the position of the outer surface of the square steel tube column 1.
[0018]
Thereafter, the high-strength bolt 3 is passed through the washer 8, passed through the bolt hole 9 of the end plate 2, screwed into the screw hole 5 of the plug nut 4 of the square steel pipe column 1, and tightened. In this tightening process, the plug nut 4 is subjected to a rotational force that tries to rotate together with the high-strength bolt 3, and the plug nut 4 has an annular bottom surface of the flange receiving recess 6 of the screw hole 5. The plug nut 4 is set in the screw hole 5 in an appropriate arrangement state without being further screwed into the depth of the screw hole 5 due to the contact with the screw hole 5. As described above, the end plate 2 and the square steel pipe column 1 are appropriately high-strength bolted from the outside of the square steel tube column 1 as shown in FIG.
[0019]
In the modification shown in FIG. 4, the flange portion 4 d of the plug nut 4 is notched at a predetermined portion in the circumferential direction 11, 11, and the notch portions 11, 11 serve as an inner peripheral surface of the flange receiving recess 6. In the space formed between the two, the weld W is applied. By doing so, it is possible to prevent the plug nut 4 from returning to the outer side of the square steel pipe column 1 due to vibration or the like after the high-strength bolt is joined. In addition, since welding W is performed in the space formed by the notches 11, 11, the welding bead may jump out outward on the outer surface of the square steel pipe column 1. Absent. In addition, as a detent means for the plug nut 4, other than filling the space formed by the notches 11 and 11 with an adhesive or notching the flange 4d. Alternatively, the plug nut 4 and the square steel pipe column 1 may be joined to each other by interposing an adhesive in the fitting region.
[0020]
The modification shown in FIG. 5 relates to a method of forming the flange receiving recess 6, and there is no flange receiving recess in the screw hole 5. Instead, the hole is larger in diameter than the screw hole 5 of the square steel pipe column 1. The auxiliary plate 13 is used, and the auxiliary plate 13 is attached to the outer surface of the square steel pipe column 1 by welding W or the like so that the large-diameter hole 12 is concentric with the screw hole 5. 12 is a flange receiving recess. The depth dimension of the large-diameter hole 12 of the auxiliary plate 13 is set equal to or larger than the thickness dimension of the flange part 4d of the plug nut 4 so that the flange part 4d does not protrude out of the large-diameter hole 12. Has been.
[0021]
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the case where the square steel pipe column 1 is employed as the first member and the end plate 2 of the beam is employed as the second member has been described. May be. Moreover, although the case where the high strength bolt with a head is employ | adopted as said high strength bolt is shown in said embodiment, it is good also as a joining structure which tightens by screwing a nut to this using a high strength full screw bolt.
[0022]
【The invention's effect】
Depending on the above, the high-strength bolt joint of the present invention has the above-described structure, and therefore can effectively prevent the nut material from co-rotating in the process of tightening the high-strength bolt. Thus, the members can be appropriately joined with high strength and reliability. Naturally, it is possible to suppress the protrusion on the bolt tip side to a small size, to obtain a firm joined state without screw removal, and to be able to join even when it can only be accessed from one side Needless to say, it is something that plays.
[Brief description of the drawings]
FIG. 1 shows a structure of an embodiment, in which FIG. (A) is a sectional view and FIG.
FIG. 2 is a perspective view showing a joint portion in a separated state.
3A is a cross-sectional view showing a state before the plug nut is attached, and FIG. 3B is a cross-sectional view showing a state after the plug nut is attached.
4A and 4B show a modification, in which FIG. 1A is a perspective view of a plug nut, and FIG.
FIGS. 5A and 5B show another modification, in which FIG. 1A is a cross-sectional view showing a state in which a plug nut is set, and FIG.
6A and 6B are diagrams showing a related technique, in which FIG. 1A is a cross-sectional view showing a state before a plug nut is attached, and FIG.
[Explanation of symbols]
1 ... Square steel pipe column (first member)
2. End plate (second member)
3 ... High strength bolt 4 ... Plug nut (nut material)
4b ... Screw part 4d ... Flange part 5 ... Screw hole 9 ... Bolt through hole

Claims (1)

The first member is provided with a screw hole having a diameter larger than that of the high strength bolt,
A nut member having an outer periphery as a screw portion is attached to the first member by screwing the outer periphery screw portion into the screw hole,
The high-strength bolt is screwed into the inner peripheral thread portion of the nut member through the bolt through hole of the second member and tightened, and the nut member and the first member, and each screw of the high-strength bolt and nut member The first member and the second member are joined by a high-strength bolt by the binding force,
The nut member can be installed by screwing into the screw hole of the first member from the side of the friction joint surface between the first member and the second member, and the high strength bolt is the same as the nut member. Rotated in the direction and screwed into the nut material,
The nut member has a radially outward projecting portion at a base end portion thereof, and the projecting portion is brought into contact with the peripheral edge portion of the screw hole of the first member so as to extend further into the screw hole inward. A high-strength bolt joint structure characterized by being restricted from screwing in.

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