JPH0533351A - Steel column base of steel frame structure and execution thereof - Google Patents

Abstract

PURPOSE:To improve workability by fusion-welding a first base plate and an anchor plate to the respective upper and lower ends of a column-shaped section formed in the shape of a cross for a cross-sectional area with plate material provided with penetration holes to be penetrated with reinforcing bars, and by forming a base section. CONSTITUTION:Broken stones 25 are laid, and a position for a steel frame column 10 to be erected at is coated with mortar 26. After that, on the mortar 26, a PC plate 25 is set, and a concrete subslab 27 is placed. After that, the bolt holes of the angles 11F of the column 10 are penetrated with hole-in-anchor bolts 24, and a base section 11 is bonded to the plate 23 with nuts 11H. Then, reinforcing bars 22 are arranged to surround the periphery of the base section 11, and the penetration holes 11D of a column-shaped section 11A are penetrated with the reinforcing bars 22, and concrete 21 is placed. Besides, the main body section 12 of the column 10 is put together with the base section 11 so that the bolt holes of the second base plate 12B of the main body section 12 may be penetrated with the bolts 11E of the first base plate 11A of the base section 11, and the bolts are jointed to the base section 11 and the main body section 12 with the nuts 11H.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel column base of a steel structure and a fixing method therefor, and more particularly, to a steel column that can be easily and firmly fixed to a foundation concrete and cost reduction of field work. It relates to a method of fixing a steel column pedestal that can be achieved.

[0002]

2. Description of the Related Art As a method of joining a steel column in a conventional method of constructing a steel column base of a steel structure, a fixed end method that supports all of axial force, shear force and bending moment of the column in structural calculation, There are three methods: a pin end method that supports two forces of axial force and shearing force, and a semi-fixed end method that supports a part of axial force, shearing force, and bending moment.

Therefore, a conventional fixed end method capable of fixing the pillar most strongly will be described with reference to FIG. In the construction method using the fixed end method, after the reinforcing bars 1 shown in the same figure are arranged as desired, the steel frame columns 2 are passed through the rectangular space for the steel frame columns 2 formed by the bar arrangement, and the anchor The plate 3 was fixed to the anchor bolt 4, and then the concrete 5 was poured.

[0004]

However, the conventional steel column 2 is manufactured as a long one in a factory, and a large number of protrusions are formed in the embedded portion by fixing the stud dowel 2A to the embedded portion in advance by welding. Since these stud dowels 2A enhance the adhesive force to the foundation 5, when the steel column 1 is fixed to the foundation 5, the stud dowels 2A interfere with the rebar 1 to distort the rebar 1. There is a problem that it may be damaged or damaged.

Further, in the conventional construction of a steel frame column of a reinforced structure, since the steel frame column 2 is assembled separately from the erection of other upper frameworks, only the work of assembling the steel frame column 2 requires heavy equipment such as a wrecker. Stud givel 2A of the buried part
However, there is a problem that the steel pillar 2 must be lifted up so as not to interfere with the reinforcing bar 1 and the height and verticality must be adjusted to perform the work carefully.

Moreover, in the conventional steel column base, most of the area of the anchor plate 3 is occupied by the steel column 2. Therefore, in order to obtain a large pulling force of the steel column 2 from the foundation 5, the steel column 2 is increased accordingly. There is a problem in that the area of the anchor plate 3 that projects from the area must be large and the anchor plate becomes large accordingly.

Therefore, an object of the present invention is to fix the steel column to the foundation without using heavy equipment such as a wrecker and to construct only the embedded portion separately from the main body portion. An object of the present invention is to provide a steel column base for a steel structure and a construction method thereof, which can improve the workability of the steel column base, reduce the construction cost, and increase the pulling force from the foundation of the steel column.

[0008]

The present invention comprises a leg portion embedded in the foundation of a reinforcing bar structure and a main body portion above the base top surface which is joined to and integrated with the leg portion. A steel frame pillar of a steel frame structure, wherein the leg portion includes a columnar portion formed in a cross shape by a plate material, and a first base plate and an anchor plate welded to upper and lower ends of the columnar portion. The above object can be achieved by providing a steel column base of a steel frame structure in which a plurality of through holes through which the reinforcing bars for the basic bar arrangement are formed are formed in the plate material of the columnar portion.

The present invention also provides a method of constructing a steel frame pillar of a reinforced structure using the steel frame pillar, wherein the first base plate of the leg portion has a plurality of bolts, and the main body portion is provided through these bolts. The steel column base of the steel structure according to claim 1, which is joined and fixed to a second base plate welded to the lower end of the steel column.

[0010]

According to the method of constructing a steel-framed column of a steel-framed structure using a steel-framed column of a steel-framed structure according to the present invention, the legs are fixed to anchor bolts, and concrete is poured while the legs are fixed. Then, after embedding the leg portion in the concrete foundation, the main body portion of the steel frame pillar can be joined and fixed to the leg portion at appropriate times by using heavy equipment such as a wrecker.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS. In each drawing, FIG. 1 is a cross-sectional view showing a state where a steel frame column of a reinforcing bar structure of one embodiment of the present invention is installed, FIG. 2 is an exploded perspective view showing the steel frame column shown in FIG. 1, and FIG. 1 is a III-III sectional view of the steel column shown in FIG. 1, and FIG. 4 is a IV-IV sectional view of the steel column shown in FIG.

As shown in FIG. 1, the steel column 10 of the present embodiment has a leg portion 11 embedded in a concrete 21 of a foundation 20 of a reinforced structure and an integral portion of the leg portion 11 by being joined to the leg portion 11. And a main body 12 that forms an upper part from the top surface of the.

As shown in FIGS. 2 and 3, the leg portion 11 is welded to the columnar portion 11A formed of a plate material in a cross-shaped cross section and the upper and lower ends of the columnar portion 11A ( A welded first base plate 11B and an anchor plate 11C, and the plate material of the columnar portion 11A is provided with a plurality of through holes 11D through which the reinforcing bars 22 for basic reinforcement are inserted (in this embodiment, four cross-shaped plates). 3 for each section
Are formed one by one (see FIG. 1). Further, bolts 11E are erected at four even-angled portions of the first base plate 11B with their screw portions facing upward, and angles 11F are located outside the cross-shaped plate material on the lower surface of the anchor plate 11C. A plurality of holes (four in this embodiment) are provided by partially projecting, and the hole-in anchor bolts are provided in the prestressed concrete plate (PC plate) 23 of the foundation 20 in the bolt holes 11G formed in the projecting portions of each angle 11F. It is configured such that the leg portion 11 is fixed to the foundation 20 by passing each through hole 24 and fastening each hole-in anchor bolt 24 with the nut 11H.

Further, if necessary, a stud dowel may be attached to the plate material of the columnar portion 11A of the leg portion 11 at the position indicated by + in FIG. 1 to further strengthen the adhesive force with the foundation 20. it can.

Further, as shown in FIGS. 2 and 4, the main body 12 is formed as a hollow steel quadrangular prism similar to the conventional one, and a second base plate 12B is welded to the lower end thereof, The base plate 12B is formed with four bolt holes 12E corresponding to the respective bolts 11E of the first base plate 11B, and the main body is attached to the first base plate 11B of the leg portion 11 embedded in the concrete 21 of the foundation 20. The second base plate 12B of the portion 12 is overlapped and the two 11 and 12 are joined together by a nut 11I.

Next, a preferred embodiment of the method of the present invention using the steel column 10 will be described. First, the split stone 2
After laying 5, mortar 2 at the position to build the steel pillar 10.
Apply 6 and adjust its level. After that, the PC board 23 is set on the mortar 26, and the discarded concrete 27 is cast to fix the PC board 23. Further, before arranging the reinforcing bars 22, the bolt holes 11G of the angles 11F of the steel frame columns 10 are arranged.
Through the hole-in anchor bolt 24 to the nut 11H
The leg portion 11 is fixed to the PC plate 23 by being fastened. After installing the legs 11 on the PC board 23, the rebar 2
The reinforcing bar 22 is arranged so as to surround the periphery of the leg 11 at 2, and the reinforcing bar 22 surrounding the leg 11 is fixed through the through hole 11D of the columnar section 11A, and the reinforcing bar 22 is finished. After arranging the reinforcing bars 22, concrete 21 is placed and the fixing of the legs 11 to the foundation 20 is completed.

After that, the main body portion 12 of the steel column 10 is joined to the leg portion 11 at the time of erection of another upper object. To perform this joining, the main body 12 is lifted by heavy equipment such as a wrecker, and the main body 12 is moved so that the bolts 11E of the first base plate 11A of the leg 11 pass through the bolt holes 12E of the base plate 12B of the main body 12. After overlapping the upper ends of the legs 11, the nut 11H
The erection of the steel pillar 10 is completed by joining and fixing 1 and 12.

As described above, the steel column 10 of this embodiment
According to one embodiment of the present invention using, the following operational effects can be obtained.

That is, when the steel column 10 is installed on the foundation 20, the portion to be embedded in the foundation 20 and the portion above the top surface of the foundation 20 can be installed separately, so that the steel column 10 can be installed. When the legs of 10 are fixed to the base 20, only the legs 11 independent of the main body 12 can be easily fixed to the base 20 without using heavy equipment such as a wrecker.

Further, since the reinforcing bars 22 are laid out after the leg sections 11 are installed, the leg sections 11 can be easily fixed to the foundation 20 without damaging the reinforced reinforcing bars 22 as in the conventional case. it can.

Further, since the reinforcing bars 22 are arranged so as to pass through the through holes 11D of the leg portions 11, the leg portions 11 are formed into the foundation 2
The steel pillar 10 can be fixed more firmly to the foundation 20 by being integrated with 0.

Further, since the columnar portion 11A of the leg portion 11 is formed in a cross shape, the contact area of the anchor plate 11C with the concrete 21 becomes larger than in the conventional case, and the steel frame column 1
It is possible to increase the pullout resistance from the foundation 20 of 0.

The present invention is not limited to the above-described embodiment, but the leg portion embedded in the foundation of the reinforcing bar structure and the main body above the base top surface which is joined to and integrated with the leg portion. A steel frame pillar of a steel frame structure comprising a portion, wherein the leg portion is a columnar portion formed in a cross-shaped cross section by a plate material, and a first welded to the upper and lower end portions of the columnar portion. One base plate and an anchor plate, a plurality of through-holes through which the reinforcing bar for the basic bar arrangement is formed in the plate material of the columnar portion and the method of constructing a steel column base using such a steel column, All are included in the present invention.

[0024]

According to the method for constructing the steel column base of the steel structure using the steel column of the steel structure of the present invention, when fixing the steel column to the foundation, heavy equipment such as a wrecker is used. Instead, the embedded part is constructed independently of the main body to improve the workability of the steel column pedestal, reduce the construction cost, and increase the pull-out force from the foundation of the steel column pedestal. be able to

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a steel frame column of a steel frame structure according to an embodiment of the present invention is installed.

FIG. 2 is an exploded perspective view showing the steel frame column shown in FIG.

FIG. 3 is a sectional view taken along the line III-III of the steel frame column shown in FIG.

4 is a IV-IV cross-sectional view of the steel column shown in FIG.

FIG. 5 is a partial perspective view showing a buried portion of a conventional steel frame structure in a state where a steel frame column has been installed.

[Explanation of symbols]

10 Steel columns 11 legs 11A pillar 11B First base plate 11C anchor plate 11D through hole 12 Main body 20 Basic

Claims (3)

[Claims] 1. A leg portion embedded in a foundation of a reinforcing bar structure,
A steel-framed column of a steel-framed structure, comprising a main body part above a basic top surface which is joined to and integrated with a leg part, wherein the leg part is a columnar shape formed by a plate material in a cross-shaped cross section. And a first base plate and an anchor plate welded to the upper and lower ends of the columnar portion, the plate material of the columnar portion is formed with a plurality of through-holes through which the reinforcing bars for basic bar arrangement are formed. Steel column base of steel structure. 2. The first base plate of the leg portion has a plurality of bolts, and is joined and fixed to a second base plate welded to the lower end of the main body portion via the bolts. Steel column base of steel structure. 3. A method for constructing a steel column of a steel structure in which the legs of the steel column are embedded and fixed in basic concrete, and the legs embedded in the foundation are fixed to anchor bolts, and concrete is further constructed. A method for constructing a steel-framed column base for a steel-framed structure, comprising the steps of: placing the base and burying the leg in the foundation concrete, and then joining and fixing the main body of the steel-framed column to the leg in a timely manner.