JPH0667604U - Joint structure of steel column base and anchor bolt - Google Patents

Abstract

(57) [Summary] [Purpose] Since it is not necessary to provide a base plate at the lower end of a steel frame column as in the past, it is economical with a small number of members, and this base plate does not need to overhang. Can be made smaller,
A steel column base with high reliability can be obtained. [Structure] A cylindrical body as a threaded bar insertion portion on one end surface
10 is provided, and a joint plate 7 having a bolt through hole 9 in the thickness direction at the other end is used. The upper end of the anchor bolt 13 having a screw structure 13a is bolted to the lower end side surface of the steel column 1 through the hole 9 and the upper end of the cylindrical body 10 is formed.
The nut 17 for tightening is screwed onto the upper end of the anchor bolt 13 coming out of the tubular body 10, and the grout material 20 is injected and filled into the tubular body 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint structure of a steel column base and an anchor bolt.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 5, a base plate 3 having a bolt through hole 2 is provided at the lower end of a steel column 1 by welding or the like, and the bolt penetration of the base plate 3 is performed in order to join the steel column base and the anchor bolt. The upper end of the anchor bolt 4 is inserted into the hole 2 and the nut 5 is fitted to the protruding end thereof.

[0003]

[Problems to be solved by the device]

 In such a conventional joint structure of a steel column post and an anchor bolt, the base plate 3 must be provided at the lower end of the steel column 1, which is cumbersome, and the clearance between the hole of the base plate and the anchor bolt is small, so that the bolt is misaligned. I have a hard time setting it. In addition, the base plate 3 is projected horizontally at the lower end of the steel column 1, and the column main bars 6 and the like in the case of a steel-framed reinforcing bar structure must be arranged avoiding the base plate 3 and the entire column becomes thick. It is uneconomical.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, to eliminate the need for a base plate, which is economical with a small number of members, and which does not need to be bulged, and the joining work of individual anchor bolts. There is a clearance with the cylinder so that it can be installed easily and quickly, and because the cylinder is stronger than the conventional base plate, it is possible to bear the bending moment of the steel column base and also in terms of strength. It is to provide a highly reliable joint structure between a steel column base and an anchor bolt.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention uses a joining plate having a cylinder as an insertion portion of a screw rebar on one surface and a bolt through hole at the other end in the thickness direction. Bolt the bottom surface of the steel column through the bolt through hole so that the surface opposite to the surface on which the cylinder is abutted, and move the upper end of the anchor bolt with a screw structure from the bottom to the top of the cylinder. The gist is to insert the grout material through the injection hole provided in the tubular body by screwing a nut for tightening onto the upper end of the anchor bolt coming out of the tubular body.

[0006]

[Action]

 According to the present invention, the joint plate is bolted to the lower end side surface of the steel column, so that the threaded reinforcing bar insertion portion is provided in the vertical direction on the lower end side surface of the steel column. Therefore, if the upper end of an anchor bolt having a screw structure is passed through this insertion part and a tightening nut is screwed into the protruding end, the nut will prevent the upper end of the anchor bolt from coming out of the insertion part. A tightening force is given by the nut, and the anchor bolt fixes the lower end of the steel column through the joint plate.

Further, there is a clearance between the inner diameter of the cylinder and the anchor bolt in order to absorb a planar deviation, and the grout material is injected into the cylinder through an injection hole provided in the cylinder to cause rattling. Can be held down.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of the joint structure of a steel column foot and an anchor bolt of the present invention, and FIG. 2 is a transverse plan view of the same as above. In the figure, 1 is a steel column and 7 is a joint plate. This joining plate 7 will be explained. As shown in FIG. 3, one end side of the elongated plate 8 is provided with a suitable number of bolt through holes 9 penetrating in the thickness direction, and one end of the other end is provided with a screw rebar. The cylindrical body 10 as the insertion part was attached by welding. An injection hole 19 for injecting grout is provided on a side portion of the cylindrical body 10.

A bolt hole is provided in the flange 1a, which is the lower end side surface of the steel frame pillar 1, and the joint plate 7 is configured so that the surface opposite to the surface where the cylindrical body 10 is present contacts the surface of the flange 1a. The high-strength bolts 11 are used to bolt the steel column 1 through the bolt holes on the side 1 and the bolt through holes 9 on the side of the joining plate 7.

On the other hand, it is assumed that the anchor bolts 13 embedded in the concrete foundation 12 are made of screw rebars or deformed rebars, and at least the upper end of the concrete top 14 of the foundation 12 has a screw structure 13a. In the figure, reference numeral 15 is a base mortar.

When the steel pillar 1 is erected on the base mortar 15, the upper end of the anchor bolt 13 having the screw structure 13 a is penetrated from below the cylinder 10 of the joint plate 7 to above the cylinder 10. A tightening nut 17 is screwed onto the upper and lower ends of the anchor bolt 13 with a washer 16 interposed. In this way, the nut 17 applies a tightening force to the anchor bolt 13 to fix the lower end of the steel column 1. If a grout material 20 such as high-strength non-shrink mortar is injected into the cylinder 10 through the injection hole 19 of the cylinder 10, this will fill the gap between the inner diameter of the cylinder 10 and the anchor bolt 13 and suppress rattling. .

By making the inner diameter of the tubular body 10 larger than the diameter of the anchor bolt 13, it is possible to absorb the planar deviation of the steel frame column 1 and the vertical relationship of the steel frame column 1 is that of the tubular body 10. This can be done by adjusting the protruding length of the anchor bolt 13 for the above.

Further, as shown in the drawing, an angle member 17 having a bolt insertion hole may be attached to the web 1b of the steel column 1, and the upper end of the anchor bolt 13 may be fixed with a nut through the angle member 17. .

FIG. 4 shows another example of the joint plate 7 used in the present invention. The elongated plate body 8 is wider than that shown in FIG. 3, and the cylinder body 10 and the bolt through holes 9 are provided in a plurality of rows. You can also do it. The joining structure between the steel column base and the anchor bolt of the present invention using the joining plate 7 in the second embodiment is almost the same as that described with reference to FIG. 1 in the first embodiment.

[0015]

[Effect of device]

 As described above, the joint structure between the steel column base and the anchor bolt of the present invention eliminates the need to provide a base plate at the lower end of the steel column as in the conventional case, is economical with a small number of members, and the base plate is not overhanging. It is possible to reduce the cross section of the column by using steel-reinforced concrete construction. Further, it becomes possible to bear a part of the column base bending moment of the steel frame without the tubular body being deformed by tension and compression unlike the conventional base plate, and the column main bar can be reduced.

[0016] Further, since there is a clearance between the tubular body and the anchor bolt due to a slight planar deviation, the joining work can be done easily and quickly, and if screw rebars are used, the anchor bolt without a hook at the tip can also be used. However, it is possible to obtain a steel column base with high reliability in terms of strength.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a joint structure of a steel column base and an anchor bolt of the present invention.

FIG. 2 is a cross-sectional plan view showing an embodiment of the joint structure of the steel column base and the anchor bolt of the present invention.

FIG. 3 is a perspective view showing an example of a joining plate used in the present invention.

FIG. 4 is a perspective view showing another example of the joining plate used in the present invention.

FIG. 5 is a side view showing a conventional example.

[Explanation of symbols]

 1 ... Steel column 1a ... Flange 1b ... Web 2 ... Bolt through hole 3 ... Base plate 4 ... Anchor bolt 5 ... Nut 6 ... Column main bar 7 ... Joining plate 8 ... Slender plate 9 ... Bolt through hole 10 ... Cylindrical body 11 ... High Power bolt 12 ... Concrete foundation 13 ... Anchor bolt 13a ... Screw structure 14 ... Concrete top 15 ... Base mortar 16 ... Washer 17 ... Nut 18 ... Angle material 19 ... Injection hole 20 ... Grout material

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Ken Kitamura Ken 2 Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Creator Masahiro Ishizuke 520 Yokokura Shinta, Oyama City, Tochigi Prefecture Iron Steel Co., Ltd. (72) Inventor Tomomi Masuda 520 Yokokura Nitta, Oyama City, Tochigi Prefecture Tokyo Steel Corp. (72) Inventor Shinichi Nawada 520 Yokokura Nitta, Oyama City, Tochigi Prefecture Tokyo Steel Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A joining plate having a cylindrical body as an insertion portion of a screw rebar on one end surface and a bolt through hole provided in the other end in the thickness direction is used, and the joining plate has a cylindrical body surface. And a bolt to the lower end side surface of the steel column through the bolt through hole so that the surface opposite to the abutment is abutted, and the upper end of the anchor bolt having a screw structure is passed through from the bottom to the top of the tubular body. A joint structure between a steel column pillar and an anchor bolt, characterized in that a tightening nut is screwed onto the upper end of the anchor bolt, and a grout material is injected and filled from an injection hole provided in the cylinder.