JPH0781314B2 - Joint structure of upper and lower steel columns - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a joining cylinder body in which only cylindrical upper and lower steel frame columns having the same closed cross section are attached between the upper and lower steel frame columns, and the joining cylinder body. And a plurality of high-strength bolts that are bolted to one of the upper and lower steel frame columns to join the upper and lower columns.

[Conventional technology]

Various inventions relating to a method of joining upper and lower steel columns having a closed cross section such as a rectangular steel pipe have been developed and applied for conventionally.

The applicant of the present invention has also developed and applied various inventions of this kind up to now, but they have a metal joint between the upper and lower columns at the portion intersecting the beam, and the upper and lower columns and the metal joint are welded or raised. They were joined by force bolts (for example, Shokai 61).
-185805 and 61-73746).

[Problems to be solved by the invention]

However, these techniques have a problem that they cannot be applied as they are when joining upper and lower steel columns in the middle of the second floor and the third floor of a building, for example. It was clarified that in the midway joining of such steel columns, it is necessary to consider the lateral stress applied to the columns and the effect on the wall foundation.

This invention has been made to solve the above problems, and can easily and easily fit the upper and lower steel frame columns with a closed cross section,
Moreover, it is an object of the present invention to provide a joint structure of upper and lower steel frame columns that can be securely and firmly joined.

[Means for Solving the Problems]

The joint structure of the upper and lower steel frame columns according to the present invention is the joint structure of the upper and lower steel column columns in which only the cylindrical upper and lower steel frame columns 1 and 2 having the same closed cross section are joined to each other by the joining cylinder body 3 to face each other. The joining cylindrical body 3 has a cylindrical insertion portion 3a which is inserted into one of the upper and lower steel columns 1 and 2, and a radial direction of the cylindrical insertion portion 3a along the periphery of the axial tip of the insertion portion 3a. A protrusion formed to have a size equal to or slightly larger than the outer diameter
5b, the insertion portion 3a has a plate thickness larger than the plate thickness of the upper and lower steel frames 1 and 2, and has a plurality of screw holes 6 into which the high-strength bolts 4 are screwed, and the protrusion 5b has a radial direction on its front side. Flat surface
5c is formed, a groove 5 for welding and a cylindrical backing portion 5a are formed on the back side, and the insertion portion is provided at a joint portion where a plurality of bolt holes 7 are provided in one of the upper and lower steel frame columns 1 and 2. 3a is inserted, and a plurality of high-strength bolts 4 are screwed into the screw holes 6 through the bolt holes 7 in a state where the end surface of the joint portion and the flat surface 5c are in surface contact with each other. One of them is joined to the joining cylinder body 3, and the other of the upper and lower steel frame columns 1 and 2 has the groove 5 with the backing portion 5a inserted in the inner portion of the end thereof.
It is characterized in that it is joined to the joint tube body 3 by welding utilizing the above.

〔Example〕

Hereinafter, a description will be given of an example of a joint structure of upper and lower steel frame columns according to the present invention. The upper and lower steel frame columns 1 and 2 made of square steel pipes are joined by a joining cylinder 3 and a plurality of high-strength bolts 4. Has been done.

The joining tube body 3 is a tubular insertion part formed in a rectangular cross-section shape that can be inserted into the ends of the upper and lower steel frame columns 1 and 2 by the fabrication or casting.
It has 3a and is formed thicker than the upper and lower steel frame columns 1 and 2.

A protrusion 5b is formed along the peripheral edge of the axially distal end of the insertion portion 3a of the joining cylinder 3, and a radial flat surface 5c is formed on the front side thereof. Further, by forming a taper on the back side of the protrusion 5, a groove 5 for welding to the upper end portion of the lower steel column 1 is continuously formed in the circumferential direction of the joining cylinder body 3, and the tip portion of the groove 5 is formed. The tubular backing portion 5a is formed continuously in the circumferential direction of the joining tubular body 3.

The flat surface 5c is brought into contact with the end face of the joining cylinder 3 when the insertion part 3a is inserted into the joining part 2a at the end of the upper steel frame 2. The outer diameter of the protrusion 5b is equal to or slightly larger than the outer diameter of the upper and lower steel frame columns 1 and 2, and is formed continuously in the circumferential direction of the joining cylinder 3.

Then, in the joint cylinder 3, the groove 5 is abutted on the end of the lower steel column 1 and the backing part 5a is attached to the inner side of the end of the lower steel column 1, and the inside of the groove 5 is welded all around. By doing so, it is integrally attached to the upper end of the lower steel column 1.

It should be noted that the welding accuracy between the joining cylinder 3 and the lower steel frame column 1 can be improved by performing factory welding.

Further, a plurality of screw holes 6 for screwing the high-strength bolts 4 are formed on the four side surface portions of the insertion portion 3a of the joining cylinder body 3. A plurality of vertical slits 8 are formed at the lower end of the upper steel column 2.

By providing the vertical slit 8, the lower end portion of the upper steel column 2 can be slightly deformed in the radial direction, so that there is an effect that the joint cylinder 3 can be easily inserted into the lower end portion of the upper steel column 2.

However, the end surface of the upper steel column 2 is in surface contact with the flat surface 5c in a horizontal plane, and the weight of the upper steel column 2 is safely supported.

When the insertion portion 3a of the joining cylinder 3 is inserted into the joining portion 2a of the upper steel column 2, the end surface of the joining portion 2a of the upper steel column 2 contacts the flat surface 5c, so that the screw hole 6 and the upper portion Steel column 2
There is an effect that it is easy to align with the bolt hole 7 formed in the joint portion 2a.

The vertical slit 8 is provided in the central portion or the corner portion of the upper steel column 2. In that case, the vertical slit 8 of the upper steel column 2
Is formed to be shorter than the insertion portion 3a of the joining cylinder body 3.

The insertion portion 3a of the joint cylinder 3 thus formed is inserted into the joint portion 2a of the upper steel column 2, and the high-strength bolt 4 is screwed into the screw hole 6 from the bolt hole 7 to thereby form the upper steel frame. It is integrally fixed to the column 2, and thus the lower steel column 1 and the upper steel column 2 are integrally joined by the joining cylinder 3 and the plurality of high-strength bolts 4.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

(1) The present invention does not join the upper and lower steel frame columns at the joint portion between the steel frame column and the steel frame beam as in the prior art, but joins only the upper and lower steel frame columns by the joining cylinder.

Therefore, since there is no support by a steel beam as in the conventional structure especially for the lateral stress, the joining must be able to withstand the lateral stress, but according to the configuration of the present invention, the lateral stress is not applied. At this time, the shearing force is applied to the high-strength bolt 4, but the end face of the steel column to which the bolt is joined is projected.
Since it is supported in contact with the flat surface 5d of 5b, the movement of the steel column in the axial direction is restricted at that portion, and it is possible to control the fracture due to shearing of the high-strength bolt and its surroundings.

Since the cylindrical backing part 5a in the butt welded part is inserted and contacted with the inner part of the steel column to be joined, it prevents the flow of weld metal during welding and also applies lateral stress to the steel column. The stress resistance of the welded part is improved.

Since the joining cylinder 3 is inserted into the steel column to be bolted and the high-strength bolt 4 is screwed in the state where the flat surface 5c of the projection 5b is in contact with the end face of the steel column, the bolt hole 7 of the steel column is joined. The screw holes 6 of the cylindrical body 3 are easily and accurately positioned, so that the high-strength bolts 4 are evenly shared with each other, so that a particular one of the high-strength bolts 4 and its periphery are not unduly burdened. In addition, the stress resistance in the lateral direction does not decrease.

In addition, this configuration is similar to the embodiment in the present invention, in the case where the slit 8 is provided at the joint portion of the steel column to facilitate the insertion of the steel column 3 of the joint tube 3 into the steel column, Furthermore, the effect is greatly exhibited.

That is, when the steel frame pillar is lowered from above into the joining cylinder body 3 at the site, the end face thereof is supported by the flat surface 5c of the projection 5b in horizontal surface contact, so that the portion where the slit 8 of the steel frame pillar is provided is in the radial direction. The self-weight of the steel column can be stably supported at its contact surface without opening.

Therefore, even in such a case, the bolt 7 of the steel frame pillar and the screw hole 6 of the joining cylinder 3 are accurately positioned without axial deviation.

(2). In the present invention, the upper and lower steel frame columns are not the steel beam parts,
For example, since it is to be joined in the middle of the pillar portion such as between the second floor and the third floor, it is necessary to avoid protrusions that interfere with the wall foundation or the like when joining.

In the present invention, since the outer diameter of the projection 5b supporting the end face of the steel column is formed to be the same as or slightly protrudes from the outer diameter of the steel column, it is high in the state where the joining cylinder 3 and the steel column are joined. No protrusion beyond the head of the force bolt.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a joint portion structure of upper and lower columns according to the present invention, FIG. 2 is a vertical sectional view of a joint portion of upper and lower columns, and FIG. 3 is a side view of a joint cylinder. is there. 1,2 …… Upper and lower steel columns, 2a …… Joined part, 3 …… Joined cylinder, 3a …… Insert part, 4 …… High-strength bolt, 5 …… Groove, 5a
…… Backing part, 5b …… Protrusion, 5c …… Flat surface, 6 …… Screw hole, 7 …… Bolt hole, 8 …… Vertical slit.

Claims (1)

[Claims] 1. A joint structure of upper and lower steel columns in which only tubular upper and lower steel columns 1 and 2 having the same closed cross-section are joined to each other by a joining cylinder 3, and the joining cylinder 3 is composed of upper and lower steel frames. A cylindrical insertion portion 3a to be inserted into one of the columns 1 and 2, and the outer diameter of the upper and lower steel columns 1 and 2 in the radial direction from there along the periphery of the axial tip of the insertion portion 3a, or that It has a projection 5b formed in a slightly projecting size, and the insertion portion 3a has a plate thickness thicker than that of the upper and lower steel frames 1 and 2 and a plurality of screw holes 6 into which the high-strength bolts 4 are screwed. The projection 5b has a flat surface 5c in the radial direction formed on the front side thereof, a groove 5 for welding and a cylindrical backing portion 5a formed on the back side thereof, and a plurality of upper and lower steel columns 1 and 2 are formed. The insertion portion 3a is inserted into the joint portion provided with the bolt hole 7 and the end surface of the joint portion and the flat surface 5c are in surface contact with each other. By screwing a plurality of high-strength bolts 4 into the screw holes 6 through the bolt holes 7, one of the upper and lower steel frames 1 and 2 is joined to the joining cylinder body 3, and the other of the upper and lower steel frame columns 1 and 2 has its end portion. The backing part 5a on the inner side of
Is joined to the joint cylinder 3 by welding using the groove 5 in the inserted state.