JPH10159253A - Fixed column base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the shape and structure and improve the constructive workability and reduce the material cost and the construction cost, by embedding an anchor box in a foundation or a slab and erecting a column into the anchor box. SOLUTION: An anchor box 3 is embedded in a foundation 1 or a slab and a column 2 is erected in the anchor box 3. A curing material 8 such as mortar or the like is charged in the gap between the column 2 and the anchor box 3 to integrally form the column and the anchor box. In this time, a level- adjusting bolt 4 and horizontal position-adjusting bolts 5, 5 are rotated to precisely adjust the erected position of the column 2 in the vertical and horizontal planes. When necessary, reinforcing plates 6, 9 are extended at the upper and lower peripheral sides of the anchor box 3 and anchored in the foundation or the slab by anchoring members 7 such as a shear key or the like. In this way, the structure is simplified and the construction is facilitated and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed column base used when building a column of a building on a foundation or a slab.

[0002]

2. Description of the Related Art Conventional fixed column bases include a base plate system in which a base plate fixed to the lower end of a column is fastened and fixed to a foundation with anchor bolts, and a root winding system in which a lower portion of a column provided with stud bolts is covered with reinforced concrete. However, lessons learned from the recent Great Earthquake have demanded the strengthening of fixed column bases, and various improvements have been made. However, most of the improvements proposed so far are
Since the shape and structure are complicated and many functional members are used in combination, the material cost is increased, the workability of construction is poor, and the construction cost is unnecessarily increased.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fixed column base having a simplified structure, simple construction and low cost.

[0004]

Means for Solving the Problems In the fixed column base of the present invention, the anchor box is embedded in the foundation or slab,
A pillar is erected from the upper opening of the anchor box, and a gap between the pillar and the anchor box is filled with a hardening material such as mortar.

As described above, the anchor box is embedded and fixed in the concrete of the foundation or the slab, and the column built from the opening on the upper surface of the anchor box is made of a hardening material such as mortar filled in the gap between the column and the anchor box. The columns are tightly bonded and integrated by hardening of the material, so that the columns are firmly fixed and supported upright on the foundation or slab.

[0006] The anchor box can be provided with a level adjusting bolt abutting on the lower surface of the column and a horizontal position adjusting bolt abutting on the side surface of the column. In this case, before the pillar is built in the anchor box, the level of the pillar is set by placing the level measuring jig on the head of the level adjustment bolt. When the initial measurement level is higher than the design level, the level adjustment bolt is rotated in the direction in which the bolt head descends by inserting the rotary operation tool from the upper opening of the anchor box. Conversely, when the initial measurement level is lower than the design level, the level adjustment bolt is rotated in the direction in which the bolt head rises. Thus, the pillar, whose lower surface abuts the head of the level adjustment bolt, is adjusted in the vertical plane so as to come to the designed level.

[0007] After the pillars are built in the anchor box at the design level, and before the mortar is filled, it is checked whether the pillars are arranged at the designed positions in the horizontal plane. When the pillar is shifted from front to back and left and right from the design position, rotate the horizontal position adjustment bolt in the required direction,
The position of the pillar is adjusted in a horizontal plane by pressing the side face of the pillar with a screw motion.

In addition, a reinforcing plate can be provided on the anchor box so as to protrude, and the reinforcing plate can be fixed to a foundation or a slab by a fixing member such as a shear key. When the reinforcing plate is attached in this way,
The stress transmission from the columns and the anchor box to the foundation and slab is distributed and the foundation around the upper part of the anchor box is reinforced.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An anchor box is made of a steel pipe cut to a predetermined length, and preferably, the anchor box and the column have the same sectional shape. That is, when the pillar is a square steel pipe, a square steel pipe is used, and when the pillar is a circular steel pipe, a circular steel pipe is used. When attaching a level adjusting bolt, a screw hole is drilled vertically at the center of the bottom wall of the anchor box, or a thick nut member is welded so that the screw hole is vertical, and the level adjusting bolt is attached to the vertical screw hole. Screwed into. In addition, when the horizontal position adjusting bolt is attached, horizontal screw holes are provided in four directions of front, rear, left and right on side wall portions of the anchor box protruding from the upper surface of the foundation, and the horizontal position adjusting bolt is screwed into the horizontal screw hole.

When a reinforcing plate is attached, an anchor box is fitted into the central opening of the reinforcing plate, and the reinforcing plate is welded to the anchor box. A required number of fixing members are welded to the lower surface side of the reinforcing plate. The fixing member is formed of a shear key, a stud, or the like, and has a shape suitable for connecting and integrating the reinforcing plate and the foundation.

[0011]

In the illustrated embodiment, since the column 2 is a square steel pipe, the anchor box 3 is formed of a square steel pipe one size larger than this, and the bottom opening of the anchor box 3 is a welded bottom cover plate. 3a. The anchor box 3 is embedded and fixed at a predetermined position when the concrete of the foundation 1 or the slab is cast in place. The nut member 10 is welded to the center of the upper surface of the bottom cover plate 3a, and the level adjustment bolt 4 screwed into the vertical screw hole 11 of the nut member 10 has a large diameter head 4a. A rotary operating tool for changing the height position of the level adjustment bolt 4 is inserted from the opening on the upper surface of the anchor box 3 before filling the mortar 8, and the tip drive unit is attached to the bolt head 4a. . An end plate 2a is welded to the lower end of the column 2, and the end plate 2a is placed on the head 4a of the level adjustment bolt 4 set at a predetermined height.

A horizontal screw hole 12 is formed in the center of the upper part of the front, rear, left and right side walls 3b, 3c, 3d, 3e of the anchor box 3.
, And a horizontal position adjustment bolt 5 is screwed into each of them. The tips of the four front, rear, left and right horizontal position adjustment bolts 5 are the front, rear, left and right side surfaces 2b, 2c, 2d, 2e of the column 2.
And the column 2 is anchored by the screw motion.
In the front, rear, left and right directions. The head 5a of the horizontal position adjustment bolt 5 is attached to the base 1 for convenience of the rotation operation.
Projecting a certain distance from the upper surface of.

An upper reinforcing plate 6 is attached to the outer periphery of the upper part of the anchor box 3. The upper reinforcing plate 6 is a square steel plate, and the anchor box 3 is fitted in the central square opening 6a. The upper reinforcing plate 6 is welded to the anchor box 3 at a position slightly lower than the horizontal position adjusting bolt 5. Have been. A fixing member 7 such as a shear key or a stud is welded to the lower surface of the upper reinforcing plate 6 downward. In the present embodiment, a lower reinforcing plate 9 is attached to the lower outer periphery of the anchor box 3 in the same manner as the upper reinforcing plate 6, and a required fixing member 7 is also welded to the lower reinforcing plate 9.

In the above embodiment, the anchor box 3 is simply buried in the concrete of the foundation 1 or the slab. However, as another embodiment, the lower part of the anchor box is formed by the underground beam or slab of the foundation. Can be fixed to the built-in beam.

[0015]

As described above, in the fixed column base according to the first aspect of the present invention, the anchor box is embedded in the foundation or slab, the column is erected in the anchor box, and the mortar or the like is hardened in the gap between the column and the anchor box. Since the column and the anchor box are integrated by filling with a conductive material, the shape and structure are simplified, the material cost is reduced, the workability is improved, and the cost is reduced.

[0016] In the fixed column base according to the second aspect of the present invention,
The level adjustment bolts that contact the bottom of the pillar and the horizontal position adjustment bolts that contact the side of the pillar are provided in the anchor box. It can be adjusted to a high level, and the built-in position of the pillar can be easily and accurately adjusted in a horizontal plane by rotating the horizontal position adjusting bolt.

According to the third aspect of the present invention,
The reinforcing plate was extended around the upper part of the anchor box, and the reinforcing plate was fixed to the foundation or slab with a shear key, etc., so the shearing force acting on the column base due to the bending moment acting during a storm or an earthquake, etc. Since the burden is distributed to the surrounding basic concrete and the basic concrete in the relevant portion is not crushed, a necessary and sufficiently large supporting force is stably secured for a long period of time.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a fixed column base according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 2 Column 2a End plate of pillar 3 Anchor box 3a Bottom cover plate of anchor box 4 Level adjustment bolt 4a Head of level adjustment bolt 5 Horizontal position adjustment bolt 5a Head of horizontal position adjustment bolt 6 Upper reinforcing plate 7 Fixing member 8 Curable substance such as mortar 9 Lower reinforcing plate 10 Nut member 11 Vertical screw hole 12 Horizontal screw hole

Claims (3)

[Claims] 1. A fixed column base in which an anchor box is embedded in a foundation or slab, a column is built in the anchor box, and a gap between the column and the anchor box is filled with a hardening material such as mortar. 2. A level adjusting bolt abutting on a lower surface of the column,
The fixed column base according to claim 1, wherein a horizontal position adjusting bolt abutting on the column side surface is provided in the anchor box. 3. The fixed column base according to claim 1, wherein a reinforcing plate is extended around an upper portion of the anchor box, and the reinforcing plate is fixed to the foundation or the slab by a fixing member such as a shear key. .