JPH0464369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a base plate used when building steel columns of civil engineering and architectural structures on concrete foundations.

[Conventional technology]

FIG. 9 is a sectional view of a main part showing a state in which a column made of steel is erected on a concrete foundation using a conventional base plate. In the figure, first, a base plate 2 is welded to the lower end of a steel column 1. Next, the base plate 2 is placed on the pre-cast concrete base 3 with a partial mortar 4 interposed therebetween. In this case, since anchor bolts 5 are previously provided protruding from the concrete base 3, positioning is performed using bolt holes 8 provided in the base plate 2.
After the above positioning, for example, a wooden frame 6 is placed and mortar 7 is filled between the bottom surface of the base plate 2 and the concrete base 3.

[Problem that the invention seeks to solve]

The conventional base plate 2 described above generally has a bottom surface formed into a substantially horizontal surface. Therefore, the height of the space formed between the bottom surface of the base plate 2 and the concrete base 3, that is, the space to be filled with mortar 7, is constant from the center of the bottom to the peripheral edge. On the other hand, the mortar 7 to be filled in the space does not necessarily have good fluidity, and is usually filled without particularly controlling the filling direction or flow direction, so there are bubbles at the boundary with the bottom surface. Or a cavity is formed. If such bubbles or cavities occur, it will cause a discontinuity between the base plate 2 and the mortar 7, resulting in incomplete stress transmission, and the rotational deformation due to the bending moment generated in the column base will become large, causing damage to the building. There is a problem that the structural performance of the

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems existing in the above-mentioned prior art, and to provide a base plate that can prevent the formation of bubbles or cavities during filling with mortar and maintain the performance of the column base.

[Means for solving problems]

In order to solve the above-mentioned problems of the prior art, in the present invention, fixed to the leg of the column made of steel material,
In a base plate made of one or more steel plates used for connection with a concrete base, the height h from the virtual horizontal plane to the bottom surface is hc≦h
≦he [where hc is the height at the center of the bottom surface, he is the height at the periphery of the bottom surface], and a technical method was adopted in which h increases sequentially from the center to the periphery. .

[Effect]

With the above configuration, the periphery of the bottom of the base plate is located higher than the center of the bottom, so
When filling with mortar, air can be expected to move smoothly outward without being trapped in the center of the bottom of the base plate.

〔Example〕

1 and 2 are a front view and a bottom view, respectively, showing a first embodiment of the present invention, and the same parts are designated by the same reference numerals as in FIG. 9. In both figures, a flat portion 2c is provided at the center of the bottom surface of the base plate 2, and the other surface is an inclined surface 2b. That is, in FIG. 1, if the height from the virtual horizontal plane P to the bottom surface of the base plate 2 is h, then hc≦
Formed so that h≦he. In this case, hc and he are the heights from the virtual horizontal plane P to the flat portion 2c and the peripheral edge 2e of the base plate 2, respectively. The height h described above is formed so as to increase sequentially from the bottom central portion (flat portion 2c) of the base plate 2 to the peripheral edge portion 2e. 2d is a bolt hole.

With the above configuration, even when the base plate 2 is placed and filled with mortar 7 as shown in FIG. 9, the space formed between the base plate 2 and the concrete base 3 is always Since the peripheral edge is located at a higher position than the center of the bottom surface, the air is replaced with the mortar 7 very smoothly, and no air remains in the space. Therefore, since the mortar 7 is completely solidified in close contact with the bottom surface of the base plate 2, deterioration in the performance of the column base can be prevented.

3 and 4 are a front view and a bottom view, respectively, showing a second embodiment of the present invention, and the same parts are designated by the same reference numerals as in FIGS. 1 and 2.
In both figures, the structure shown in FIGS. 1 and 2 is the same as that shown in FIGS.
It is the same as the embodiment, and therefore the operation is also the same.

FIG. 5 and FIG. 6 are a front view and a bottom view, respectively, showing a third embodiment of the present invention. The base plate 2 of this embodiment has the same structure as the first embodiment shown in FIGS. 1 and 2, except that the flat portion 2c of the base plate 2 is omitted.

Next, FIGS. 7 and 8 are a front view and a bottom view, respectively, showing a fourth embodiment of the present invention. In this embodiment, the bottom surface of the base plate 2 is formed into a spherical surface, and the operation is the same as in the first to third embodiments.

In this embodiment, examples are shown in which the projected outline of the base plate on the plane is a rectangle or a square, but it can be formed into other geometric shapes other than a square, taking into account the cross-sectional shape of the column and other factors. Furthermore, although an example has been shown in which the bottom surface of the base plate is formed as a convex surface, it may be formed as a convex curved surface as long as it satisfies the relationship hc≧h≦he.

〔Effect of the invention〕

Since the present invention has the structure and operation described above, it is possible to prevent the generation of air bubbles or cavities when pouring or filling mortar into the bottom surface of the base plate, and to maintain the performance of the column base. can. Further, when filling mortar, adhesion to the base plate can be obtained without paying particular attention to the filling direction, resulting in extremely good workability.

[Brief explanation of the drawing]

1 and 2 are a front view and a bottom view, respectively, showing a first embodiment of the present invention, and FIGS. 3 and 4 are a front view and a bottom view, respectively, showing a second embodiment of the present invention, and FIG. 6 and 6 are respectively a front view and a bottom view showing a third embodiment of the present invention, FIGS. 7 and 8 are a front view and a bottom view respectively showing a fourth embodiment of the present invention, and FIG. 9 is a front view and a bottom view showing a fourth embodiment of the present invention, respectively. FIG. 2 is a cross-sectional view of main parts showing a state in which a steel column is constructed on a concrete foundation using a conventional base plate. 2: base plate, 2b: slope, 2c: flat part.

Claims (1)

[Claims] 1. In a base plate made of one or more steel plates that is fixed to the leg of a column made of steel and used for connection with a concrete base, the height h from the virtual horizontal plane to the bottom surface is hc≦ h≦he (however, hc
is the height of the center of the bottom, he is the height of the periphery of the bottom),
A base plate characterized in that the base plate is formed such that h increases sequentially from the center portion to the peripheral portion. 2. The base plate according to claim 1, wherein the inclined surface formed by the bottom surface is a flat surface. 3. The base plate according to claim 1, wherein the inclined surface formed by the bottom surface is a curved surface.