JPH0671534U - Fixed structure of column base - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the appearance of the joint between the base plate and the steel column, and to improve the fit between the steel column and the outer wall. [Structure] Anchor bolt 10 fixed to footing 3
The base plate 5 at the lower end of the column 4 is fixed to the anchor bolt 10, and the anchor bolt 10 is made of unbonded high-tensile steel. The lower end of the anchor bolt 10 is fixed to the footing 3 and the anchor bolt 1
Tighten the base plate 5 to the upper end of 0 with the nut 9,
Even if the anchor bolt 10 is extended by tightening the nut 9, the extension force of the anchor bolt 10 is not transmitted to the concrete of the footing 3. Further, since the position of the nut 9 is set within the contour of the cross section of the column 4 so that the area of the pace plate 5 can be made smaller than the contour of the cross section of the column, the nut 9 can be well fitted to the outer wall.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for fixing a column base, and more particularly to a structure for fixing a column base of a steel frame column to a footing by using anchor bolts.

[0002]

[Prior art]

 FIG. 4 shows a conventional column base fixing structure. An anchor bolt 2 whose lower end is engaged with an anchor plate 1 is embedded in a footing 3 with its upper end protruding, and a base plate 5 of a steel column 4 is fixed to the upper end using a nut 9. In this case, the rising part 6 made of concrete is interposed between the footing 3 and the base plate 5. Further, here, the height of the lower surface of the base plate 4 is the floor level 7. The footing 3 is integrally connected with an underground beam 8 to support the load of the building in cooperation with the footing 3.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, since the anchor bolt 2 is arranged on the outer side of the steel frame column 4, the shape of the base plate 5 becomes large, and the anchor bolt 2 is exposed. There was a problem in fitting with the outer wall.

[0004]

[Means for Solving the Problems]

 The fixing structure of the column base of this invention is the fixing structure of the column base in which the base plate at the lower end of the column is fixed to the anchor bolt fixed to the footing. The bottom end of the anchor to the footing, apply tension to the anchor bolt to fix the base plate above the footing, and then place the steel column on the base plate and weld the anchor bolt within the outline of the steel column. It will be joined.

[0005]

[Action]

 Since the anchor bolt fits within the contour of the column, the base plate can be small and interference between the base plate and the rise of the outer wall can be avoided. Also, since the base plate is fixed to the footing by introducing tension to the anchor bolt, the column base is elastically fixed.

[0006]

【Example】

 1 and 2 show a first embodiment of the present invention, in which an anchor bolt 10 having a lower end head engaged with an anchor plate 1 is embedded in a footing 3 with its upper end protruding. is there. The anchor bolt 10 is made of high-strength steel and is unbonded. The anchor bolt 10 is installed in the form of the footing 3 in a state of being engaged with the anchor plate 1, and is positioned by hardening and hardening the concrete so that the upper end thereof protrudes. Therefore, footing 3 is configured. Further, although the underground beam 8 is also formed by concrete casting when forming the footing 3, the underground beam 8 may be formed before or after the footing 3.

A base plate 5 is arranged on the upper surface of the footing 3 via a leveling mortar 3 a, the base plate 5 is arranged through the upper end of the anchor bolt 10, and the nut 9 is tightened to the upper end of the anchor bolt 10. In addition, the procedure for forming the footing 3 is that the nut 9 is temporarily tightened in advance by passing the upper end of the anchor bolt 10 through the base plate 5, and then the concrete for the footing 3 is placed below the base plate 5 and the upper portion of the anchor bolt 10 is placed. It is also possible to adopt a procedure of casting and hardening so as to embed most of the material except the material. In this case, the nut 9 should be fully tightened after the concrete for the footing 3 has hardened.

In any case, after the concrete forming the footing 3 is hardened, the base plate 5 is crimped and fixed to the footing 3 by tightening the nut 9 screwed onto the anchor bolt 10 on the upper surface of the base plate 5. . Since the anchor bolt 10 is made of high-tensile steel, the crimping and fixing can be made firm, and even if the anchor bolt 10 is stretched due to the tightening of the nut 9, the anchor bolt 10 is unbonded. Since it is not adhered to the footing 3, it can be freely extended and tension can be easily introduced.

After the base plate 5 is crimped and fixed to the footing 3, the steel post 4 is welded to the base plate 5. At this time, the steel column 4 is a hollow column made of steel and having a square cross section, and the anchor bolt 10 and the nut 9 are put inside the steel column 4 to perform the welding. Therefore, the area of the base plate 5 can be reduced by the amount that the anchor bolts 10 and the nuts 9 do not appear outside the steel column 4, and conversely, the steel column having a large thickness relative to the area of the base plate 5 can be obtained. 4 can be used. Further, as described above, the difference in size between the base plate 5 and the thickness of the steel frame pillar 4 is reduced, so that the appearance is improved, and the fitting with the outer wall is improved.

The steel frame column 4 is not limited to having a square cross section, and may have any other polygonal or circular shape as long as it can surround the nut 9 and the anchor bolt 10 and can be welded to the base plate 5. Reference numeral 7 in FIG. 1 indicates a floor level. FIG. 3 is a view showing a second embodiment of the present invention, in which a rising portion 6 is formed on the upper surface of the footing 3, and a base plate 5 is installed on the upper surface of the rising portion 6 so that the rising portion 6 is substantially footed. It is used as part of 3. Therefore, the anchor bolt 10 penetrates the rising portion 6 from the lower part of the footing 3, and the base plate 5 is crimped and fixed to the footing 3 via the rising portion 6 by the anchor bolt 10. Also in this embodiment, since the anchor bolt 2 is made of high-strength steel and is unbonded, the peripheral surface of the anchor bolt 2 is not adhered to the footing 3 and the rising portion 6. The floor level 7 is at the height of the upper surface of the rising portion 6. Other configurations and operations are the same as those in the first embodiment.

In both of the above embodiments, the hollow steel frame post 4 surrounds the nut 9 and the anchor bolt 10. However, the nut 9 and the anchor bolt 10 are in the line connecting the perimeters of the steel frame post 4. If they are arranged, they have the same effect as those of the above-described embodiments in relation to the size of the base plate 5. For example, this is the case where the steel column 4 is made of H-shaped steel and the nut 9 and the anchor bolt 10 are arranged between both flanges.

[0012]

[Effect of device]

 As described above, in the present invention, since the anchor bolt made of high-tensile steel is used, the column can be firmly connected to the footing without increasing the diameter of the anchor bolt. Since it is unbonded, there is no adhesion of concrete forming footing on the peripheral surface of the anchor bolt. For this reason, the anchor bolt can freely extend and tension can be easily introduced. In addition, the anchor bolt fits within the outline of the cross section of the column, so the appearance is good, and it fits well with the outer wall.

[Brief description of drawings]

FIG. 1 is a front view of the first embodiment.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view of the second embodiment.

FIG. 4 is a front view of a conventional example.

[Explanation of symbols]

 1 ... Anchor plate 3 ... Footing 4 ... Steel column 5 ... Base plate 6 ... Rise 9 ... Nut 10 ... Anchor bolt

Claims (1)

[Scope of utility model registration request] 1. In a column base fixing structure comprising an anchor bolt fixed to a footing and a base plate at the lower end of the column, the anchor bolt is made of unbonded high-tensile steel, and the lower end of the anchor bolt is used as a footing. In addition to fixing, the base plate is fixed to the upper side of the footing by applying tension to the anchor bolt, and a steel frame column is further mounted on the base plate, and the anchor bolt is housed within the outline of the steel frame column and welded. The fixed structure of the column base.