JPH07119169A - Joint structure of steel central pillar - Google Patents

Abstract

PURPOSE:To improve the accuracy of construction, and to enhance profitability by carrying out the mutual connection of steel central pillars through flanges having mutually fittable structure. CONSTITUTION:One steel central pillar 1 and the other steel central pillar 2 are formed by steel pipes, and flanges 4 and 6 are welded at each end connection of the pillars 1 and 2. An inverted conical shape 3a is formed at the center of the flange 4 of one steel central pillar 1, and the front end section of the inverted conical shape 3a is formed in a spherical projection 3 having a shape, in which a part of a sphere is cut off. A hole 6 is made in the center of the flange 6 of the other steel central pillar 2, and a recessed section 5 with a curved surface having a complement shape to the spherical projection 3 is arranged into the hole 6. The spherical projection 3 of one steel central pillar 1 is fitted into the recessed section 5 of the other steel central pillar 2, and centering is completed. The steel central pillar 1 is turned, boltholes formed to the flanges 4, 6 are aligned, and the flanges are fixed by bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for connecting steel core columns which are main structures of a reinforcing bar structure.

[0002]

2. Description of the Related Art Various types of steel frames are used for the structure of a reinforced structure, and in particular, there is a method of using a steel core column as a part for connecting with a foundation part. That is, when forming a pillar of concrete, a steel material filled with mortar or concrete is placed inside it, but since this steel material is located in the center part of the pillar, the steel material placed in the core, that is, the steel core. It is called a pillar.

Since the steel core column is used as an integrated structure by sequentially connecting the steel core columns in the above-ground part to the underground steel core columns buried in the underground part, no inclination should occur during the connection. It goes without saying that the accuracy of the part is extremely important.

Therefore, conventionally, the structure shown in FIG. 5 has been adopted. The figure shows a case where the upper steel core column 30 is connected to the lower steel core column 31, and flanges 33 and 34 are welded to the respective connection ends of the lower steel core column 31 and the upper steel core column 30. Then, a large number of bolt holes penetrating the respective flanges 33 and 34 are bored, and the bolts 35 are passed through the bolt holes and fastened by the nuts 36.

Therefore, the flanges 33, 34 are in a so-called metal touch state in which the mutual contact surfaces are in close contact with each other over the entire area thereof and at a plurality of points on the close contact surface are all in contact with a predetermined accuracy.

Although this connection structure is simple at first sight, the steel core column generally has a long span. Therefore, even if there is a slight error in the angle of connection, it will be a large deviation at the upper end and extremely high accuracy is required. Therefore, after attaching the flange to the steel core column in the factory, the contact surface between the flanges is cut to control the angle.

[0007]

However, in the above-mentioned conventional one, there is a limit to the processing accuracy, and the predetermined accuracy may not be obtained depending on the processing state of the mating flange to be connected. Moreover, there is a problem that it is difficult to perform the construction on the site because it is necessary to secure the accuracy while matching the hole positions of the flanges with each other, and it is also difficult to correct (rebuild).

The present invention has been made in view of the above matters, and provides a joint structure for a steel core column which is easy to manufacture, can be easily and accurately connected on site, and can be easily finely adjusted. Is a technical issue.

[0009]

In order to solve the above technical problems, the present invention has the following constitution. That is, in the joint structure provided on the one and the other steel core columns 1 and 2 to be connected, the spherical projection 3 provided at the center of the connection end of the one steel core column 1 and the one steel core column One of the flanges 4 provided so as to project around the connection end of No. 1 and the connection end of the other steel core column 2 are provided with the spherical projection 3
1 and the other flange 6 formed so as to surround the recess 5, and a fastener 7 for fastening the one and the other flanges 4, 6 at an arbitrary angle.

A bolt and nut can be used as the fastener 7.

[0011]

When the spherical projection 3 provided at the center of the connection end of one steel core column 1 is fitted into the recess 5 provided at the connection end of the other steel core column 2, the spherical projection 3 and the recess 5 are formed. Surfaces contact each other. And one and the other flange 4,
After being temporarily fixed by the fastener 7 provided between the 6 and 6, the fastener 7 is finely adjusted and fastened with a predetermined accuracy.

Therefore, the manufacturing precision is not required as in the conventional manufacturing, and the manufacturing is easy. Further, since the construction can be performed while finely adjusting the angle and the like of the steel core pillar, it is possible to connect with high accuracy on site. Moreover, by fitting the spherical projections and the recesses together, the lateral displacement of the steel core columns can be completely prevented and centering becomes easy.

Furthermore, since the fasteners can be readjusted, fine adjustments can be easily made after construction. Since the load of the steel core column located on the upper side is received by the spherical surface formed by the spherical projection 3 and the concave portion 5, there is no problem in strength, and between the one and the other flanges 4 and 6, the concrete is used in a later step. Therefore, the same strength as the conventional one can be obtained.

As described above, it was possible to improve the economical efficiency of the construction, shorten the construction period, and improve the construction accuracy.

[0015]

Embodiments of the present invention will be described with reference to FIGS. The one and the other steel core columns 1 and 2 are each made of a steel pipe, and the other steel core column 2 is an existing one, and the one steel core column 1 is connected to this, which will be described below.

One flange 4 formed in a disc shape so as to project around the connecting end is welded to the connecting end (lower end) of the one steel core column 1. And this one flange 4
An inverted conical convex portion 3a is provided at the center of the. A spherical projection 3 having a shape obtained by cutting out a part of a sphere is formed at the tip of the convex portion 3a.

On the other hand, the other flange 6 having a circular hole 6b formed at the center is welded to the connecting end (upper end) of the other steel core column 2. A recess 5 having a curved surface having a shape opposite to that of the spherical projection 3 is arranged in the hole 6b. The recess 5 is formed by pressing a steel plate into a spherical shape.

Eight bolt holes 7c are formed at the same position on each of the one and the other flanges 4 and 6 at an angle of 45 degrees. Then, the bolt 7a and the nut 7b as the fastener 7 are mounted in the bolt hole 7c.

The one and the other flanges 4 and 6 and the side surfaces of the steel core columns 1 and 2 are at a right angle, and reinforcing plates 4a and 6a are welded to the corners of the flanges 8 and 8 respectively. The positions of the reinforcing plates 4a and 6a are the bolt holes 7c.
And are arranged in an alternating positional relationship.

Concrete (mortar) 8 is filled inside the one and the other steel core columns 1 and 2. In the above configuration, when connecting the one and the other steel core columns 1 and 2, first, the spherical projection 3 provided at the center of the connecting end of the one steel core column 1 is made into the recess of the other steel core column 2. Fit to 5. In this state, the centering of the one and the other steel core columns 1 and 2 is automatically completed. Then, one steel core column 1 is rotated to accurately overlap the bolt holes 7c provided in the one and the other flanges 4 and 6, respectively, and then the bolt 7a is inserted.

After the insertion, two nuts 7b are screwed into the bolt 7a, and one nut 7b is fastened to fix the bolt 7a to the one flange 4. Subsequently, the nut 7b is further screwed into the tip of the bolt 7a inserted into the bolt hole 7c of the other flange 6, and the other flange 6 is clamped and fastened together with the previous nut. Thus, the one and the other flanges 4, 6 are fixed by the bolt 7a and the nut 7b.

It is needless to say that this fixing is performed while maintaining the verticality of the one steel core column 1, but the nut 7 is also used.
It can be corrected many times by loosening b. Then, after the position is determined, the form 9 is constructed around the integrated steel core column and concrete is placed to form the column 9. At this time, since concrete will flow into the gaps formed in the one and the other flanges 4 and 6, there is no fear that the strength will decrease.

As described above, according to the present invention, since the processing accuracy is not secured by the processing accuracy, the processing accuracy at the time of manufacturing is not required and the manufacturing is easy. And since it can be installed while finely adjusting the angle of the steel core pillar, it can be connected with high accuracy at the site, and
When the spherical projection 3 and the concave portion 5 are fitted to each other, there is no room for lateral displacement, and centering is easy.

[0024]

According to the present invention, since high precision is not required at the time of manufacturing, the manufacturing is extremely easy. Also,
Since the construction can be performed while finely adjusting the angle and the like of the steel core pillar, it is possible to connect with high accuracy on site.

Moreover, the spherical projections and the recesses are fitted to each other to facilitate the centering and prevent the lateral displacement, and the readjustment of the fastening tool allows the fine adjustment after the construction to be easily performed.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention.

FIG. 2 is a perspective view of a use state showing an embodiment of the present invention.

FIG. 3 is a side view with a partial cross section of a main part showing an embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 5 is a side view showing a conventional joint structure for a steel core column.

[Explanation of symbols]

 1 ・ ・ One steel core column, 2 ・ ・ Other steel core column, 3 ・ ・ Spherical projection, 4 ・ ・ One flange, 5 ・ ・ Concave, 6 ・ ・ Other flange, 7 ・ ・ Fastening tool .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Mizuguchi 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. Construction Industry Co., Ltd. (72) Inventor Hiroshi Motoda 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Yoichi Takaya 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industrial Co., Ltd. (72) Inventor Tatsushi Yamazaki 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) In-house Shinji Kato 2-1026 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Co. In the company

Claims (1)

[Claims] 1. A joint structure provided on one and the other steel core columns to be connected, wherein a spherical projection provided at the center of the connecting end of the one steel core column and one steel core column are connected. One flange provided so as to project around the end, a recess corresponding to the spherical projection provided at the connection end of the other steel core column, and the other flange formed so as to surround this recess, and these A joint structure for a steel core column, comprising: a fastener for fastening one and the other flange at an arbitrary angle.