JPH1046601A - Base plate for fixing column base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the kinds of production by applying a base plate to various column base having different cross sectional shapes, and to reduce cost by forming a second projecting section on the inside of a first projecting section formed so as to be welded to the lower end of the leg. SOLUTION: Anchor-bolt inserting holes 9 are formed to the peripheral section of a base plate 1 prepared of cast steel, and a first projecting section 2 is shaped while being placed on the side inner than the inserting holes 9. Crossed second projecting sections 3 are formed while being crossed at right angles with the inside of the first projecting section 2. Air vent holes 4, 4, 5, 5 are formed at places, where mortar filled between the base plate and base concrete is brought into contact. When the cross sectional shapes of legs are formed in a round shape or a square shape, the base plate 1 is welded and fixed at the lower ends of the column bases. When the cross sectional shapes are formed in an H form, the base plate is welded and fastened by the opposed two sides of the first projecting section 2 and the second projecting sections 3 tying the two sides. Accordingly, the base plate 1 can be applied to a various kind of the column bases having different sectional shapes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedestal fixing base plate used for fixing a pedestal such as an iron pipe column or a steel column.

[0002]

2. Description of the Related Art Conventionally, a column base having an exposed anchor bolt is considered to be a pin structure in terms of structural mechanics, and it is interpreted that it does not bear a bending resistance moment. I had to.

[0003] In order to fix the column pedestal, generally, the column pedestal is buried in the underground beam or the footing, or the column pedestal is wrapped around, so that the column pedestal can bear the bending resistance moment. There must be.

[0004] To this end, it has been a time-consuming method to once stop the concrete with the steel frame under the base of the column base, construct the steel column, and then cast the concrete again.

[0005] In view of the above, a method of increasing the degree of fixation of the column base portion using an exposed anchor bolt type has been considered.
It has been adopted as a column base fixing structure.

FIG. 6 is an explanatory view of the column base fixing structure.
First, as shown in FIG. 6 (a), an anchor bolt 101, which is a main member, is installed at a predetermined position with a template 102, an anchor frame 103 and the like to form a frame body 120. As shown in b), reinforcement 1
04. Forming is performed and foundation concrete 105 is placed. Thereafter, the template 102 is removed, and the foundation concrete 1 is supported so as to support the center of the base plate 107.
Level adjustment body on 05 (usually called "bun")
113 is placed.

Then, instead, a base plate 107 welded and fixed to the lower end of the column base 106 is previously fitted to the anchor bolt 101 through an anchor bolt insertion hole 107a (FIG. 7) provided on the periphery thereof.
Is fixed with a nut 109.

After the column base is constructed, the base plate 107
6C, an injection frame 110 is provided by a crosspiece or the like so as to provide an opening for mortar injection, and as shown in FIG. 6C, a mortar 112 is injected into the gap 114 from this opening as a grout material by an injection tool 111. . That is, the mortar 112 reaches the base concrete 105 and the base plate 107 through the opening, is filled in the gap 114, and closely adheres the base concrete 105 and the base plate 107.
Fix it.

The base plate used in this column base fixing structure has a column base 10 in order to reduce weight and facilitate handling.
Only at a portion to be welded to 6, a welding convex portion 107b having the same shape as the cross-sectional shape of the column base is formed to be thick. Therefore, FIG.
As shown in (a), (b) and (c), round pillar, BOX pillar, H
It is necessary to prepare various types of base plates 107 that match the cross-sectional shape of the column base 106 such as a column.

[0010]

Since the conventional base plate for fixing column bases is constructed as described above, there are the following problems.

[0011] 1) Since the convex portions to be formed on the base plate are determined for each cross-sectional shape and size of the column base, it is necessary to prepare various types of base plates having different shapes and sizes of the convex portions. is there.

2) Since the base of the welding convex portion is at a right angle,
There is a fear that stress concentrates on the base and the base is broken.

3) Since the surface of the lower end of the base plate is flat, when the mortar filled between the base plate and the foundation concrete hardens, the mortar shrinks due to gravity and due to the evaporation of water, and the mortar shrinks at the center. There is a possibility that the air is trapped and the base plate and the mortar do not adhere completely.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is applicable to various types of column base cross-sectional shapes, is excellent in strength, and can reduce the cost. The purpose is to obtain.

It is another object of the present invention to provide a base plate in which the mortar filled between the base plate and the foundation concrete is completely adhered and the state of filling of the mortar can be checked from the outside.

[0016]

According to a first aspect of the present invention, there is provided a base plate for fixing a column base, wherein an anchor bolt insertion hole provided in a peripheral portion and a lower end of the column base positioned inside the anchor bolt insertion hole. It has a first convex portion provided so as to be welded, and a second cross-shaped convex portion provided perpendicularly to the inside of the first convex portion.

According to a second aspect of the present invention, there is provided a column base fixing base plate in which reinforcing ribs are provided at the bases of the first convex portion and the second convex portion.

According to a third aspect of the present invention, there is provided a column base fixing base plate in a position where an anchor bolt insertion hole provided in a peripheral edge portion and a mortar filled between the anchor bolt insertion hole and a foundation concrete are in contact with each other. An air vent hole is provided.

According to a fourth aspect of the present invention, in the base plate for fixing a column base, a hole edge of a side of the air release hole that contacts the mortar is formed in a funnel shape.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a plan view showing a base plate according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1. In the figure, reference numeral 1 denotes a base plate made of cast steel; A first convex portion for welding integrally provided on the surface of the base plate 3 is a cross-shaped convex portion provided integrally with the base plate 1 inside the first convex portion 2 and 4 is a first convex portion. An air vent hole 5 located inside the convex portion 2 and provided in the base plate 1 is an air vent hole located outside the first convex portion 2 and provided in the base plate 1.

At the bases of the first and second convex portions 2 and 3, triangular ribs or gentle gradients 2a and 3a are provided to avoid concentration of stress. In addition, the air vent hole 5 is formed in a funnel shape as shown in an enlarged view in FIG. 3 on the edge 5a, 5b of the surface in contact with the mortar filled with the base plate 1.

Next, the operation will be described. First, the base plate 1 is integrally attached to the lower end of the column base 6 by welding. In this case, when the cross-sectional shape of the column base 6 is round or square, welding fixation is performed by the first convex portion 2, and when the cross-sectional shape is H-shaped, the first convex portion 2 is opposed to the first convex portion 2. 2 sides and 2
Welding and fixing are performed by the second convex portions 3 connecting the sides. Therefore, one type of base plate can be applied to many types of column bases 6 having different cross-sectional shapes.

Next, as shown in FIG. 4, an anchor bolt 8 provided at a predetermined position by pouring the foundation concrete 7 is engaged with an anchor bolt insertion hole 9 provided on the peripheral portion of the base plate 1 to form a set. wear. And
The washer 10 is fitted to the anchor bolt 8 that has penetrated the insertion hole 9, and the nut 11 is tightened and fixed. Reference numeral 12 denotes a level adjuster placed on the foundation concrete 7 so as to support the central portion of the base plate 1.

4 and 5 (FIG. 1B)
As shown in a cross-sectional view taken along line -B, which schematically shows an air flow during mortar injection), an injection frame 13 is provided around the base plate 1 at a distance from the base plate 1 to form an injection opening. The mortar 15 is injected from the opening by the injection tool 14. This mortar 15 is filled in the gap between the foundation concrete 7 and the base plate 1. In this case, since the base plate 1 has the air vent holes 4 and 5, the air in the gap is filled according to the filling of the mortar 15. The mortar 15 flows out to the outside, and the mortar 15 is smoothly and uniformly filled in the gap with this outflow, so that the air pool as shown by the dotted line in FIG. 5 does not occur.

When the mortar 15 is filled, the mortar is formed through the air vent hole 5 when the column base 6 has a round or square cross section and through the air vent holes 4 and 5 when the column base 6 has an H cross section. 15 can be confirmed. Moreover, since the air vent holes 5a and 5b on the surface of the base plate 1 which are in contact with the mortar 15 are formed in a funnel shape, the mortar 1
5 can smoothly flow into the air vent hole 5, and the above-mentioned checking operation can be performed easily and reliably.

[0026]

According to the first aspect of the present invention, there is provided an anchor bolt insertion hole provided in a peripheral portion, and a first hole provided inside the anchor bolt insertion hole and welded to a lower end of a column base. Since it is configured to have a convex portion and a cross-shaped second convex portion provided orthogonally to the inside of the first convex portion, it can be used for various types of column bases having different cross-sectional shapes. The present invention has the effect of reducing the number of types of production and reducing costs.

According to the second aspect of the present invention, since the reinforcing ribs are provided at the bases of the first convex portion and the second convex portion, the strength is improved and the second convex portion is provided. Also function as reinforcing ribs, and the overall strength is significantly improved. As a result, it is possible to produce an arbitrary shape with a mold from cast steel, cut unnecessary portions, reduce the thickness and weight, and have an effect that handling becomes easy.

According to the third aspect of the present invention, an air vent hole is provided at a position where the anchor bolt insertion hole provided in the peripheral edge portion and the mortar filled between the anchor bolt insertion hole and the foundation concrete are in contact. With this configuration, the mortar filling the gap between the base plate and the foundation concrete flows smoothly into the gap, and there is an effect that the base plate and the mortar are completely adhered to each other without causing air pockets.

Further, when the mortar is filled, the filling condition of the mortar can be confirmed from the air vent hole regardless of whether the column base has a round cross section, a square shape or an H shape.

According to the fourth aspect of the present invention, since the hole edge of the air vent hole on the surface in contact with the injection mortar is formed in a funnel shape, the injection mortar flows into the air vent hole smoothly. Thus, there is an effect that the above checking operation can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a plan view showing a base plate according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view including a lower part of a column base along a line AA in FIG. 1;

FIG. 3 is an enlarged vertical cross-sectional view of a portion of an air vent hole corresponding to a circle in FIG. 2;

FIG. 4 is a side view of the base plate showing a state before filling with a grout material.

FIG. 5 is a sectional view taken along line BB in FIG.
It is a longitudinal cross-sectional view along a line.

FIG. 6 is an explanatory view showing a conventional anchor bolt construction process.

FIG. 7 is a plan view showing a conventional base plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column base 2 1st convex part 3 2nd convex part 2a, 3a Slope (reinforcement rib) 4,5 Air vent hole 5a, 5b Hole edge 9 Anchor bolt insertion hole 15 Mortar

Continued on the front page (71) Applicant 396018863 Shigeto Tanaka Ueki 78, Uki, Kamakura City, Kanagawa Prefecture 606 (72) Inventor Motoomi Ogata 1413-2 Kamiyari, Matsudo City, Chiba Prefecture (72) Inventor Eiji Suzuki Chiba Prefecture 9 at 129 Komagaki, Nagareyama-shi (72) Shoichi Takahashi 2-6-2 Otemachi, Chiyoda-ku, Tokyo Within Kotobuki Industry Co., Ltd. (72) Masayuki Kato 1-3-3 Takadanobaba, Shinjuku-ku, Tokyo No. 13 Inside Masato Kato Architectural Research Institute (72) Inventor Shigeto Tanaka 606 Ofuna Corpobianaise Ueki 78 Ueki, Kamakura City, Kanagawa Prefecture

Claims (4)

[Claims] An anchor bolt insertion hole provided in a peripheral portion, a first convex portion located inside the anchor bolt insertion hole and welded to a lower end of a column base,
And a second cross-shaped projection provided orthogonally to the inside of the projection. 2. The column base fixing base plate according to claim 1, wherein reinforcing ribs are provided at bases of the first convex portion and the second convex portion. 3. A base plate fixing base plate provided with an air vent hole at a position where an anchor bolt insertion hole provided in a peripheral portion and a mortar filled between the anchor bolt insertion hole and a foundation concrete are in contact with the anchor bolt insertion hole. 4. The base plate for fixing a column base according to claim 3, wherein a hole edge of the air vent hole on a side in contact with the mortar is formed in a funnel shape.