JPH01158117A - Column base structure - Google Patents

Abstract

PURPOSE:To raise the efficiency of operation by a method in which the center of a projected contour in relation to the horizontal face of base plate and the center of a projected contour in relation to the horizontal face of column are biassedly formed. CONSTITUTION:Under a condition that the center of projected contour for the horizontal face of a column 1 and the center of projected contour for the horizontal face of a base plate 2 are biassed, the column 1 is integrally connected with the plate 2 by welding. The dimensions from the center of the column 1 to the right side of the concrete foundation 3 can thus be cut down and working space can be secured on the right side of the foundation 3. The efficiency of operation can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a column base structure of a steel frame structure or a steel reinforced concrete structure.

[Conventional technology]

When installing conventional steel columns on concrete foundations,
Generally used is a method in which a base plate made of a steel plate is welded to the base of a steel column and then fixed using anchor bolts buried in a concrete foundation. FIG. 15 is a sectional view of a main part showing an example of a conventional column base structure.

In the same figure.

First, a base plate 2 made of a steel plate is attached to a column l made of a steel plate.
are joined together by welding and placed on a pre-cast concrete foundation 3 with a portion of mortar 4 interposed therebetween. In this case, since a predetermined number of anchor bolts 5 are buried in the concrete foundation 3, positioning is performed using bolts 66 drilled into the base plate 2. Thereafter, a wooden frame 7, for example, is placed, and mortar 8 is filled between the base plate 2 and the concrete foundation 3. After the mortar 8 is sufficiently hardened, a washer 9 is inserted into the anchor bolt 5 and a nut 10 is fastened to fix the column l.

[Problem that the invention seeks to solve]

FIG. 16 is a plan view of the arrangement of columns in an architectural building. In such a column arrangement, when the conventional column base structure shown in FIG.
As is clear from FIG. 15, the side surface of the concrete foundation 3 protrudes outward from the building from the center of the column 1, making site work extremely difficult. That is, the side pillars 20 and the corner pillars 21 are usually provided close to the boundary line 22 of the neighboring property, and especially in the vicinity of the boundary line 22 of the neighboring property.
In a work environment where it is not possible to enter the adjacent land beyond the concrete foundation 3 shown in Figure 15.
Not only the work of pouring concrete foundations 31 but also the work of installing mortar 8, etc. must be carried out in a narrow work space, which not only greatly impairs work efficiency, but also makes it difficult to place concrete foundations 31, mortar 8, etc. This will also affect the quality after installation. Furthermore, as mentioned above, since the side of the concrete foundation 3 protrudes outward from the building from the center of the pillar 1, it may be necessary to secure more distance than necessary between the building and the adjacent land, and the building area may be reduced. There is a problem in that the size of the site has been reduced and the site area cannot be used effectively.

The present invention solves the problems existing in the above-mentioned prior art, improves workability at construction sites without deteriorating quality and other characteristics, expands the building area, and makes effective use of the site. The purpose is to provide

[Means for solving problems]

In order to solve the problems existing in the above-mentioned prior art, in the first invention of the present application, a base plate made of one or more steel plates joined to the leg of a column made of steel and a concrete foundation are provided.

Anchor bolts buried in concrete foundation
In the column base structure that is joined through □, the center of the projected profile of the base plate with respect to the horizontal plane and the center of the projected profile of the column with respect to the horizontal plane are eccentrically formed. A technical method was adopted.

Further, in a second invention of the present application, in addition to the first invention, a means for preventing out-of-plane deformation of the base plate is provided on the non-eccentric side of the base plate. This technical method was adopted.

[For production]

With the above configuration, in the side pillars and corner pillars,
The dimension from the center of the projected contour of the column to the plane of the concrete foundation to the outer surface of the concrete foundation can be made much shorter than that of the central column, making it possible to secure a working space between the columns and the adjacent land.

In addition, in the second invention, it is possible to prevent so-called out-of-plane deformation in which the non-eccentric side of the base plate deforms by making the upper surface convex, and to ensure the stability of the column.

The above-mentioned out-of-plane deformation prevention means include a means for restraining the base plate by increasing the projected area on a plane of a washer interposed in the anchor bolt, a means for increasing the number of anchor bolts installed on the non-eccentric side of the base plate, Alternatively, there is a means for reinforcing the base plate on the non-eccentric side with a rib provided between the column and the base plate, which can be selected as appropriate in consideration of the dimensions, shapes, etc. of the column and the base plate.

〔Example〕

1 and 2 are a sectional view and a sectional plan view of a main part showing an embodiment of the first invention of the present application, respectively, and the same parts are indicated by the same reference numerals as in FIG. 15. As shown in both figures, the column 1 and the base plate 2 are joined together by, for example, welding, with the center of the projected contour of the column 1 on the horizontal plane and the center of the projected contour of the base plate 2 on the horizontal plane being eccentric. .

With the above configuration, as is clear from FIGS. 1 and 2, the dimension from the center of the column 1 to the right side of the concrete foundation 3 can be shortened.

In other words, a work space can be secured to the right of the concrete foundation 3 in both figures above.

Next, FIGS. 3 to 6 are cross-sectional plan views of main parts showing other embodiments of the first invention of the present application, and the same parts are shown in the first embodiment of the present invention.
The same reference numerals as in the embodiment shown in FIG. 2 and FIG.

3 to 5 show cases in which the columns 1 are respectively a cylindrical steel pipe, an H-beam, and an assembled column, all of which are for side columns. FIG. 6 shows a corner column in which the column 1 is formed of a rectangular steel tube, and the center of the contour of the column 1 with respect to the horizontal plane is eccentric to the upper right corner of the base plate 2.

Next, FIGS. 13 and 14 are explanatory views of out-of-plane deformation, and the same parts are designated by the same reference numerals as in FIGS. 1 to 6. As described in the first invention, the center of the projected profile of the pillar 1 with respect to the horizontal plane and the center of the projected profile of the base plate 2 with respect to the horizontal plane are eccentrically formed.

The distance between the outer surface of the pillar 1 and the edge of the base plate 2 becomes uneven. That is, as shown in FIG. 13, the distance L2 on the eccentric side (the right side of the column l) is larger than the distance L2 on the non-eccentric side (the left side of the column l).

Therefore, when a bending moment such as M, for example, is applied to the column 1, the base plate 2 may undergo so-called out-of-plane deformation in which the upper surface becomes convex as shown in FIG.

When such out-of-plane deformation occurs, the stress generated in the column l cannot be smoothly transmitted to the concrete foundation 3,
This is inconvenient because it may lead to deformation of the entire building. In the second invention of the present application, a means for preventing out-of-plane deformation of the base plate 2 is added to the technical means of the first invention on the non-eccentric side of the base plate 2.

7 and 8 are a sectional view and a sectional plan view of a main part showing an embodiment of the second invention of the present application, respectively, and FIG. 7 shows a cross section taken along the line A--A in FIG.

In both figures, the same parts are indicated by the same reference numerals as in FIGS. 1 to 6. In both figures, the anchor bolt 5 on the non-eccentric side is interposed with a washer 9a whose projected contour on the horizontal plane is shaped like an abbreviated letter. That is, the washer 98 has a larger projected area on the horizontal plane than the washer 9 interposed on the anchor bolt 5 on the eccentric side.

With the above configuration, the fastening pressure can be applied over a wide range to the upper surface of the base plate 2 on the non-eccentric side, so that out-of-plane deformation in the base plate 2 can be prevented from occurring.

Next, FIG. 9 and FIG. 1O are a side view of a main part and a sectional plan view of a main part, respectively, showing other embodiments of the second invention of the present application.
Identical parts are designated by the same reference numerals as in the previous drawings. In both figures, the number of anchor bolts 5 installed on the non-eccentric side is greater than the number of anchor bolts 5 installed on the eccentric side.

With the above configuration, the restraining force on the base plate 2 on the non-eccentric side can be increased, and the occurrence of out-of-plane deformation in the base plate 2 can be prevented as in the previous embodiment.

11 and 12 are a side view and a cross-sectional plan view of a main part showing still another embodiment of the second invention of the present application, respectively, and the same parts are indicated by the same reference numerals as in the above drawings. . In both figures, a rib 11 is provided on the side surface of the column l to reinforce the base plate 2. And the rib l on the non-eccentric side
The projected area of la on the vertical plane is expressed as the rib ll on the eccentric side.
Form it larger than that of b.

With the above configuration, it is possible to prevent out-of-plane deformation of the base plate 2 on the non-eccentric side, as in the previous embodiment.

In the above embodiment, an example was shown in which the base plate was formed from one steel plate, but it may also be formed by polymerizing two or more sheets, or by polymerizing a plurality of steel plates with a rib in between. The effect is the same. Further, the shape and dimensions of the washer used as the out-of-plane deformation prevention means are not limited to those in the above embodiments.

The shape and dimensions of the pillar and base plate can be freely selected. Furthermore, the diameter of the anchor bolt on the non-eccentric side may be increased, the number of installed ribs may be increased, and known means other than the above-mentioned embodiments may be used as appropriate to prevent out-of-plane deformation of the base plate on the non-eccentric side. can be selected and used.

〔Effect of the invention〕

Since the invention of the present application has the structure and operation as described above, it can be used especially for side columns and corner columns,
This method has the effect of significantly improving workability and shortening the construction period, without degrading the original characteristics of the column base (2) because it can secure a working space. Since the span can be made larger, the building area can be increased and the site can be used more effectively.

[Brief explanation of the drawing]

1 and 2 are a cross-sectional view and a cross-sectional plan view of a main part showing an embodiment of the first invention of the present application, respectively, and FIGS.
The figures are a cross-sectional plan view of a main part showing another embodiment of the first invention of the present application, and FIGS. 7 and 8 are a cross-sectional view of a main part and a cross-sectional plan view of a main part showing an embodiment of the second invention of the present application, respectively. , FIG. 9 and FIG. 1O are a side view of a main part, a cross-sectional plan view of a main part, and FIGS.
The figures are a cross-sectional side view of a main part, a cross-sectional plan view of a main part, and FIGS. 13 and 14, respectively, showing still another embodiment of the second invention of the present application.
Each figure is an explanatory diagram of out-of-plane deformation, FIG. 15 is a sectional view of a main part showing an example of a conventional column base structure, and FIG. 16 is a plan view of the arrangement of columns in an architectural building. 1: Column, 2: Base plate, 3: Concrete foundation, 5: Anchor bolt, 9, 9a: Washer. 11, lla, llb: rib.

Claims (5)

[Claims] (1) In a column base structure in which a base plate made of one or more steel plates connected to the base of a column made of steel and a concrete foundation are connected via anchor bolts buried in the concrete foundation, the horizontal surface of the base plate A column base structure characterized in that the center of the projected contour relative to the horizontal plane of the column and the center of the projected contour relative to the horizontal plane of the column are eccentrically formed. (2) In a column base structure in which a base plate made of one or more steel plates connected to the base of a column made of steel and a concrete foundation are connected via anchor bolts buried in the concrete foundation, the horizontal surface of the base plate A column pedestal structure characterized in that the center of the projected contour relative to the horizontal plane of the column and the center of the projected contour relative to the horizontal plane of the column are eccentrically formed, and a means for preventing out-of-plane deformation of the base plate is provided on the non-eccentric side of the base plate. (3) The projected area on the plane of the washer for interposing the out-of-plane deformation prevention means of the base plate on the anchor bolt on the non-eccentric side, or the projected area and thickness on the plane for the washer interposed on the anchor bolt on the eccentric side. The column base structure according to claim 2, which is formed by making the column base structure larger than those. (4) The means for preventing out-of-plane deformation of the base plate is formed by making the number and/or diameter of the anchor bolts on the non-eccentric side larger than those of the anchor bolts on the eccentric side. Or the column base structure described in item 3. (5) For the out-of-plane deformation prevention means of the base plate, at least one of the number of installed ribs, the projected area on the vertical plane, the projected area on the vertical plane, and the thickness of the ribs provided on the non-eccentric side is larger than those on the eccentric side. A column pedestal structure according to any one of claims 2 to 4 formed by.