JP2523952Y2 - High strength bolted joint of square steel pipe and its filler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a high-strength bolted joint of a square steel pipe used for a pillar of a structure and a filler used for the joint.

[Prior Art] Square steel pipes have been widely used for columns of building structures, etc., and when these square steel pipes are axially joined to each other, usually a torcia-type high-strength bolt is used at the joint. Is used. This torcia-type high-strength bolt is formed by drilling a pin tail at the tip of a threaded portion through a groove so that a predetermined tightening axial force can be obtained (see Japan Steel Structure Association Standard JSSII09-1981). .

In such a joint of a square steel pipe, a hand hole is drilled near the joint, the thread portion of the torcia-type high-strength bolt is inserted into the circular bolt hole from the inside, and then the washer and nut are fitted from the outside, and The nut is tightened while fixing the pin tail with a bolt tightening machine.

[Problem to be Solved by the Invention] In a conventional high-strength bolted joint of a square steel pipe, it is essential to form a hand hole for inserting a screw portion of a bolt into a bolt hole from the inside. The ratio of the cross-sectional area to the cross-sectional area of the square steel pipe is relatively large, and there is a problem that the cross-sectional performance of the square steel pipe is significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to provide a high-strength bolted joint of a square steel pipe which can be configured without drilling a hand hole, and a method of manufacturing the same. The purpose of the present invention is to provide a filler that is suitable for use in a vehicle.

[Means for Solving the Problems] In order to achieve the above object, the high-strength bolted joint of the present invention has a long diameter common to the square steel pipe and the attached plate superimposed on the square steel pipe, and the major axis is set to the pipe axis of the square steel pipe. An oblong or rectangular bolt hole which is parallel and slightly larger than the planar shape of the head of the torcia-shaped bolt having an oblong or rectangular head whose vertical shape is perpendicular to the shaft portion is formed. A bolt having a filler, a washer, and a nut mounted on a shaft is inserted from the head from the outside into the bolt hole, rotated 90 °, and then the nut is tightened.

Further, the filler according to the present invention has a cross section having an oval or rectangular outer shape slightly smaller than an oval or rectangular bolt hole and a bolt hole at the center, and a length slightly shorter than the total thickness of the plate to be tightened. Or a steel U-shaped cross section obtained by dividing the cylindrical body into approximately two equal parts by a plane passing through the central axis of the bolt hole and the short diameter of the cross section. I do.

It is preferable that the washer has an outer diameter slightly larger than the major diameter of the bolt hole.

In the above, the oval to rectangular shape is an oval,
Includes oval, rectangular, rectangular, etc.

[Operation] In the high-strength bolted joint of the square steel pipe configured as described above and the filler thereof, the planar shape perpendicular to the bolt head and the shaft of the filler mounted on the bolt shaft is formed into an elliptical shape or more. Since it is rectangular and its outer shape is slightly smaller than the elliptical or rectangular inner shape of the common bolt hole of the square steel pipe and attachment plate, the filler attached to the bolt head and bolt shaft must be After turning the bolt head 90 ° and tightening the nut, the back surface of the head can contact the inner surface of the square steel pipe or the inner attachment plate to obtain the reaction force of bolt tension, Performs the original tightening function of the bolt.

In addition, since the filler is installed in the gap between the oval or rectangular bolt hole of the rectangular steel pipe and the attachment plate and the bolt shaft portion of the circular cross section, friction due to bolt tension between the square steel pipe and the attachment plate If no force acts, the joint and the bolt can resist shearing forces acting between the square steel tube and the backing plate, so that the joint can act as a shear bolt joint.

Example An example will be described below with reference to the drawings.

As shown in FIG. 1, the bolt used in the present invention has an oval-shaped head 12 integrally formed at one end of a shaft 11 with a flat minor axis slightly larger than the shaft diameter. A special high-strength torcia-shaped bolt 1 is formed and formed with a screw portion 13, a groove portion 14 and a pin tail 15 toward the other end. The end face of the pin tail 15 was provided with a marker 16 parallel to the major axis of the head 12.

As shown in FIG. 2 or FIG. 3, the filler has a cross section having the same outer shape as the planar shape of the bolt head 11 and a bolt hole 72 at the center, and is formed of the rectangular steel pipe 4 and the plate of the attachment plate 5. A steel tubular body 7 having a length slightly shorter than the total thickness or a steel U-shaped body 71 obtained by dividing the steel tubular body 7 into approximately two parts by a plane passing through the central axis of the bolt hole 72 and the minor axis of the cross section.
And

Further, as shown in FIGS. 4 and 5,
The round washer whose outer shape was slightly larger than the major axis of the bolt hole 6 described later was formed.

As shown in FIG. 4, a high-strength bolted joint of a square steel pipe using the above-described bolt, filler, and washer has a rectangular steel pipe 4 and a side plate 5 superimposed on the same, and has a long diameter of the square steel pipe 4. An oval bolt hole 6 that is parallel to the pipe axis and slightly larger than the outer shape of the bolt head 12 is drilled, the filler 7, the washer 2, and the nut 3 are mounted on the shaft 11, and the pin tail 15 is bolted. It is fixed by the inner socket (not shown) of the tightening machine, and the nut 3 is inserted into the bolt hole 6 from the head 12 of the bolt 1 gripped by the outer socket (not shown).
By rotating the head 12 by 90 °, the head 12 is rotated by 90 ° and the head 12 is locked by the steel pipe 4 as shown in FIG. 6, and then the nut 3 is rotated and tightened by the outer socket to obtain a predetermined tightening torque value. 4, the groove 14 was broken and the pin tail 15 was removed as shown in FIG. 4, and it was confirmed that the marker 16 was located in the minor axis direction of the bolt hole 6 and completed.

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained.

In the high-strength bolted joint for a rectangular steel pipe according to claim 1, a torcia-shaped bolt having a T-shaped head can be inserted and set from the outside into the bolt hole of the rectangular steel pipe and the attachment plate, and
Similarly, since the bolts can be tightened by attaching the filler, the washer and the nut only from the outside, the completion of the joint does not require the trouble as in the past, and the workability is very good. In addition, since the conventional handhole is not provided and the bolt hole has its major axis formed parallel to the pipe axis, it is possible to prevent the cross-sectional performance of the rectangular steel pipe from deteriorating.

Further, in the filler according to claims 2 and 3, since this joint can also function as a shear bolt joint, safety is ensured even if the friction joint that this joint should originally exhibit does not work. Can be secured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a bolt used in the present invention, and FIG.
FIG. 3 and FIG. 3 are perspective views showing an embodiment of the filler of the present invention.
FIG. 4 is a partial longitudinal sectional view of the high-strength bolted joint of the square steel pipe according to the present invention when a bolt is inserted, FIG. 5 is a partial longitudinal sectional view of the completed rectangular joint, and FIG. 6 is a sectional view taken along the line AA of FIG. It is. 1 ... bolt, 11 ... shaft, 12 ... head, 13 ... screw, 14 ... groove, 15 ... pin tail, 16 ... sign, 2 ...
... washer, 21 ... round hole, 3 ... nut, 4 ... square steel pipe,
5 ... attachment plate, 6 ... bolt holes, 7 ... filler, 71 ...
U-shaped body, 72 bolt holes

Claims (3)

(57) [Scope of request for utility model registration] 1. A rectangular steel pipe (4) and a side plate (5) superimposed thereon have a major axis parallel to the pipe axis of the rectangular steel pipe (4) and a flat shape perpendicular to the shaft part. An oblong or rectangular bolt hole (6) slightly larger than the planar shape of the head (12) of the torcia-shaped bolt (1) having an oblong or rectangular head (12) is formed. Insert the bolt (1) with the filler (7), washer (2) and nut (3) attached to the shaft (11) from the outside through the bolt hole (6) from the head (12) and rotate it 90 ° After that, a nut (3) is tightened to form a high-strength bolted joint of a square steel pipe. 2. A cross section having an oval or rectangular outer shape slightly smaller than an oval or rectangular bolt hole (6) and a bolt hole (72) at the center, and slightly shorter than the total thickness of the plate to be tightened. A filler characterized by being a steel tubular body having a length. 3. A steel U-shaped cross-section which is substantially divided into two parts by a plane passing through a central axis of a bolt hole (72) and a short diameter of a cross-section. Item 7. The filler according to Item 2.