JP2599992B2 - Pillar hardware - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a column base metal used when a steel column of a civil engineering building is built on a concrete foundation.

[Conventional technology]

2. Description of the Related Art Conventionally, when welding a main landing gear to a steel column, a method of using a base plate made of a steel plate and stiffening by a rib plate made of a steel plate has been adopted. However, in the above method, since the base plate made of steel plate is directly welded to the steel column, the base plate is bent by welding distortion. For this reason, distortion correction by heating and correction work by machining are required. Further, when a steel plate rib plate is welded, welding distortion increases, and the correction work becomes complicated.

In order to solve the above-mentioned disadvantages, column base hardware manufactured by casting or forging has been proposed.
The effects of reducing the amount of steel used and preventing the bending phenomenon of the bottom plate are mentioned (for example, JP-B-51-47963 and JP-B-56-30425). FIG. 14 is a longitudinal sectional view of an essential part showing a state in which a steel column is constructed on a concrete foundation using the column base hardware as described above. In the figure, first, a column base metal 2 having, for example, a planar outer contour formed in a square shape is welded to a lower end portion of a steel column 1 via a protrusion 21 provided on the upper surface thereof. Next, it is placed via a partial mortar 4 on a concrete foundation 3 previously cast. In this case, since the anchor bolts 5 are previously provided on the concrete foundation 3, the positioning is performed by the bolt holes 23 provided in the bottom plate portion 22 constituting the column base hardware 2.
After the positioning, the mortar 7 is filled between the bottom plate 22 of the column base metal fitting 2 and the concrete foundation 3 by, for example, disposing the formwork 6.

[Problems to be solved by the invention]

When the conventional column base metal 2 is formed by ordinary casting or forging means, it is immediately and accurately and accurately bonded and fixed to the steel column 1 because there are local irregularities on the surface and deformation due to distortion and the like. Can not do. For this reason, it is necessary to secure the accuracy by processing the entire surface of the fixing portion between the bottom surface of the column base metal fitting 2 and the upper end surface of the protrusion 21. In this case, for example, the upper surface of the protrusion 21 is set to be positive, and the entire bottom surface of the bottom plate portion 22 of the pillar base metal 2 is processed to form a reference surface. Next, the reference surface is made positive, and the upper end surface of the protrusion 21 is processed again so that the upper end surface of the protrusion 21 has a predetermined size. If the upper end surface of the protruding portion 21 is relatively smooth, the processing may not be necessary, but in any case, the entire bottom surface of the bottom plate portion 22 needs to be processed. If the precision is not ensured in this way, the axis of the steel column 1 cannot be maintained vertical, and it is difficult to bring the mortar 7 into close contact with the bottom surface of the column base hardware 2. However, machining the entire fixed portion of the upper end surface and the bottom surface of the pillar base metal 2 as described above requires a large amount of machining time and increases the number of machining steps, resulting in a high cost.

Further, the bottom plate portion 22 constituting the above-mentioned conventional column base metal fitting 2 is
Generally, the bottom surface is formed substantially in a horizontal plane. Therefore, the height of the space formed between the bottom plate portion 22 and the concrete foundation 3, that is, the space to be filled with the mortar 7, is constant from the center of the bottom plate portion 22 to the periphery. On the other hand, the mortar 7 to be filled in the space is not always good in fluidity, and is usually filled without particularly controlling the filling direction or the flowing direction. Bubbles or cavities are formed. When such bubbles or cavities are generated, a discontinuous state between the column base metal fitting 2 and the mortar 7 is caused, stress transmission is incomplete, and rotational deformation is caused by a bending moment generated in the column base. As a result, there is a problem that the performance of the entire steel column 1 is reduced.

The present invention solves the problems existing in the prior art described above, and can greatly reduce the processing time and the number of processing steps while maintaining high accuracy, prevent the generation of bubbles or cavities when filling mortar, and prevent mortar and concrete. An object of the present invention is to provide a column base hardware capable of improving the degree of fixing to a foundation.

[Means for solving the problem]

In order to achieve the above object, according to a first aspect of the present invention, in a column base hardware fixed to a lower end portion of a steel column and used for joining to a concrete foundation via an anchor bolt, a steel plate is fixed to a bottom plate portion and an upper surface. And a projection having a step is provided on the bottom surface of the bottom plate to form a reference surface having a relatively small bottom area. The technical means of forming the fixing part with the pillar so as to ensure the accuracy in the height direction was adopted.

Next, in the second invention, in addition to the technical means of the first invention, a technical means of providing one or more air vent holes penetrating vertically is added.

Further, in the third invention, in addition to the technical means of the first or second invention, the outer dimensions of the convex plane portion or the concave plane portion constituting the reference surface are equal to or less than the outer cross-sectional dimensions of the steel column. The technical means of forming the minimum 150mm and the maximum 300mm was added.

Still further, in the fourth invention, the first to third aspects described above.
In addition to the invention, the height h from the virtual horizontal plane to the bottom surface excluding the reference plane is defined as hc ≦ h ≦ he (where hc is the height up to the center of the bottom surface, he is the height up to the peripheral portion of the bottom surface), and The technical means of forming h so as to increase sequentially from the portion to the peripheral portion was added.

(Operation)

According to the above configuration, a predetermined height dimensional accuracy can be ensured only by machining or performing high-precision molding on one of the upper and lower surfaces of the column base hardware. In addition, when mortar is injected and filled into the bottom of the column base metal, the air interposed between the column base metal and the concrete foundation is easily discharged from the holes provided in the column base metal and forms a cavity in the mortar. This inconvenience can be completely avoided.

In addition, since the peripheral edge of the bottom plate of the column base is located higher than the center of the bottom plate, air can be smoothly moved outward without confining the air in the center of the bottom plate when filling mortar. Can be expected.

〔Example〕

FIGS. 1 and 2 are a vertical sectional 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. In both figures, the protruding part 2 having a bottom plate part 22 and a fixing part 21a on the upper surface to a steel column (not shown).
And 1 are integrally formed. Next, reference numeral 24 denotes a convex plane portion, which is provided substantially at the center of the bottom surface 22a of the bottom plate portion 22 so as to have a step a with the bottom surface 22a. Then, the accuracy of the dimension A in the height direction of the fixing portion 21a of the protrusion 21 with the steel column is secured using the convex flat portion 24 as a reference surface. For example, the accuracy of the dimension A can be ensured by casting the column base metal 2 and then machining the convex flat portion 24 as a reference surface with the fixing portion 21a being positive.

With the above configuration, the bottom surface 22a of the bottom plate portion 22 is
Also, the accuracy of the dimension A can be secured only by processing the convex plane portion 24 without processing the entire surface of the fixing portion 21a of the protruding portion 21, and the processing time and the number of processing steps required for machining are significantly reduced. Can be. In addition, since the surface area or the bottom area of the convex flat portion 24 is relatively small, the accuracy of the dimension A may be ensured only by casting or casting means.

Next, in FIG. 1, the length b of one side of the convex plane portion 24 is shown.
Is preferably as small as possible in order to reduce the processing time and the number of processing steps. However, as shown in FIG. 14, the convex plane portion 24 comes into contact with the partial mortar 4 to form the steel column 1 and the column base hardware. Because the positioning of 2 is performed,
If the dimensions are too small, the partial mortar 4 may be crushed. Therefore, the minimum dimension is preferably set to 150 mm. On the other hand, if it is too large, the processing time and the number of processing steps increase, and the contact area of the portion of the mortar 7 in the rear stuffing, which has good adhesion to the column base metal 2, is reduced, and the total of the column base metal 2 and the mortar 7 is reduced. Therefore, it is preferable that the width of the steel column 1 is not more than the outer dimension of the cross section, but not more than 300 mm.

FIGS. 3 and 4 are a vertical sectional 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, reference numeral 25 denotes a concave plane portion, and a bottom surface 2 is provided substantially at the center of the bottom surface 22a of the bottom plate portion 22.
It is provided so as to have a step 2a and a step a. That is, what is shown in the present embodiment is one in which the concave plane portion 25 is used as the reference plane instead of the convex plane portion 24 in the first embodiment shown in FIGS. This is the same as in the first embodiment.

FIGS. 5 and 6 are a vertical sectional view and a bottom view, respectively, showing a third embodiment of the present invention, and the same parts are denoted by the same reference numerals as those in the first and second embodiments. In both figures, the convex plane portion 24 forming the reference surface is formed in a frame shape, and the preferred dimensional range and operation are the same as those in the above embodiment.

FIG. 7 and FIG. 8 are bottom views of the essential parts showing the plane contour of the convex flat part in the fourth and fifth embodiments of the present invention, respectively. That is, even if the convex plane portion 24 forming the reference surface is formed by being divided into a band shape or an arc shape as shown in both figures, the same operation as in the above embodiment can be expected.

9 and 10 are a vertical sectional view and a partial cross sectional plan view, respectively, showing an example of a column base structure using the column base metal according to the sixth embodiment of the present invention. The same reference numerals as in FIGS. 1 to 8 and 14 are used. In both figures, reference numeral 26 denotes a hole for venting air. Preferably, one or a plurality of holes are provided at positions substantially corresponding to the planar contour of the partial mortar 4 so as to penetrate the column base metal 2 in the vertical direction.

According to the above configuration, after the steel column 1 and the column base metal 2 are welded and joined, they are placed and positioned via the convex plane portion 24 which forms a reference surface on the partial mortar 4 previously provided on the concrete foundation 3, The mortar 7 is injected and filled into the mold 6 as shown by an arrow B. In this case, air is likely to be sealed in the vicinity of the partial mortar 4 to form bubbles or cavities. However, since the column base metal fittings 2 are provided with the holes 26 as described above, they are temporarily sealed as described above. Hole even in the presence of air
Can be easily discharged from 26. Therefore mortar 7
The mortar 7 can be completely adhered to the bottom surface 22a of the column base metal 2, while the fluid filling can be performed extremely smoothly, and no bubbles or voids are generated.

FIG. 11 is a plan view of a column base 2 showing a seventh embodiment of the present invention, and the same parts as those in FIG. 10 are denoted by the same reference numerals. In the column base metal fitting 2 of the present embodiment, a hole 26 for venting air is provided outside the projection 21. The action of preventing the formation of bubbles or cavities is the same as that of the sixth embodiment. is there.

FIG. 12 is a longitudinal sectional view showing an eighth embodiment of the present invention.
The same parts are indicated by the same reference numerals as in FIGS. 1 to 11. In FIG. 12, a bottom surface of the bottom plate portion 22 is provided with a convex flat portion 24 forming a reference surface at a center portion, and another bottom surface is formed on a slope 22b. That is, from the virtual horizontal plane P to the bottom plate portion 22
When h is the height to the bottom surface, hc ≦ h ≦ he is formed. In this case, hc and he are the heights from the virtual horizontal plane P to the center of the bottom surface excluding the convex plane portion 24 and the peripheral portion 22e of the bottom plate portion 22, respectively. The height h is formed so as to gradually increase from the central portion of the bottom plate portion 22 to the peripheral portion 22e.

With the above configuration, for example, even when the column base metal 2 is placed and the mortar 7 is filled as shown in FIG. 14, the space formed between the column base metal 2 and the concrete foundation 3 is Since the peripheral edge of the bottom plate portion 22 is always at a position higher than the central portion, the replacement of the air with the mortar 7 is performed extremely smoothly, and the air does not remain in the space. Therefore, the mortar 7 is completely adhered to the bottom surface of the bottom plate portion 22 and solidifies, so that the fixing degree of the column base metal 2 is improved.

FIG. 13 is a longitudinal sectional view showing a ninth embodiment of the present invention.
The same parts are indicated by the same reference numerals as in FIG. In the present embodiment, the inclined surface 22b is formed as a convex curved surface or a spherical surface, but otherwise is the same as the eighth embodiment shown in FIG. 12, and the operation is also the same.

In this embodiment, an example is shown in which the projected contour of the bottom of the column base metal onto the plane is a substantially square, but a geometric shape other than a square is considered in consideration of the cross section of the column and other factors. be able to. In addition, although an example in which the bottom surface of the bottom plate portion is formed as a convex surface is shown, a concave curved surface may be used as long as the relationship of hc ≦ h ≦ he is satisfied. Further, in the present embodiment, the projecting portion is described as having a hollow profile in the shape of a hollow square. However, the structure of the steel column may be a cylindrical column, or may be an H-shaped steel or an assembled column made of an H-shaped steel. Of course. The operation is the same even in a structure in which the protrusion of the column base metal is omitted. Furthermore, the hole to be provided in the column base metal can have a cross-sectional shape other than circular.

〔The invention's effect〕

Since the present invention has the configuration and operation as described above, the following effects can be expected.

(1) Since the processing portion of the column base metal is extremely small, the number of processing steps and processing time can be significantly reduced.

(2) Because there is no air tightness when pouring or filling mortar between the column base hardware and the concrete foundation,
The degree of fixing to the mortar and concrete foundation can be improved, and the seismic resistance of the entire column base structure can be improved.

(3) Since air can be easily exhausted even when air is sealed when filling the mortar, generation of bubbles or voids can be eliminated.

(4) In connection with the above (2) and (3), when the mortar is filled, the adhesion to the column base metal can be obtained without paying particular attention to the filling direction, so that the workability is extremely good.

[Brief description of the drawings]

1 and 2 are a longitudinal sectional view and a bottom view, respectively, showing a first embodiment of the present invention. FIGS. 3 and 4 are a longitudinal sectional view and a bottom view, respectively, showing a second embodiment of the present invention. 5 and 6 are a longitudinal sectional view and a bottom view, respectively, showing a third embodiment of the present invention, and FIGS. 7 and 8 are plan views of a convex plane portion in the fourth and fifth embodiments, respectively. FIGS. 9 and 10 are a vertical sectional view and a partial cross-sectional plan view, respectively, showing an example of a column base structure using the column base hardware of the sixth embodiment of the present invention. 11 is a plan view showing a seventh embodiment of the present invention, FIGS. 12 and 13 are longitudinal sectional views showing the eighth and ninth embodiments of the present invention, respectively, and FIG. It is a principal part longitudinal cross-sectional view which shows the example of the column base structure using metal objects. 24: convex plane part, 25: concave plane part, 26: hole.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Norio Ito 1-9-1 Kitahama-ku, Wakamatsu-ku, Kitakyushu-shi, Fukuoka Hitachi Metals Co., Ltd. Wakamatsu Plant (72) Inventor Isamu Yamamoto 1-chome Kitahama, Wakamatsu-ku, Kitakyushu-shi, Fukuoka No. 9-1 Hitachi Metals Co., Ltd. Wakamatsu Plant (72) Inventor Kuniaki Sato 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yoshihiro Nakamura 1-Chome Moto-Akasaka, Minato-ku, Tokyo 2-7 Kashima Construction Co., Ltd. (72) Inventor Akio Tomita 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) References Real Opening Sho 61-85603 (JP, U)

Claims (4)

(57) [Claims] In a column base metal fixed to a lower end of a steel column and used for joining to a concrete foundation via an anchor bolt, a bottom plate and a protruding portion having a fixed portion with a steel column on an upper surface are integrally formed. The bottom surface of the bottom plate portion is provided with a convex flat portion or a concave flat portion having a step to form a reference surface having a relatively small bottom area, and the reference surface is used in the height direction of the fixing portion with the steel column. A column-base metal fitting formed so as to ensure the accuracy of the column base. 2. The column base metal fitting according to claim 1, wherein one or a plurality of air vent holes penetrating vertically is provided. 3. The outer dimension of the convex plane portion or the concave plane portion constituting the reference plane is equal to or smaller than the outer cross-sectional dimension of the steel column, but is minimum.
The column base metal fitting according to claim 1 or 2, which is formed to have a length of 150 mm and a maximum of 300 mm. 4. A height h from a virtual horizontal plane to a bottom surface excluding a reference plane is defined as hc ≦ h ≦ he (where hc is a height from the center of the bottom surface to hec).
The column base metal member according to any one of claims 1 to 3, wherein h is a height from a central portion to a peripheral portion.