JP5159942B1 - Column base of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column base part of a building capable of minimizing the scale of a concrete foundation to which the column base part is fixed.
SOLUTION: An upper surface of a base plate 20 made of a steel plate is welded to a lower end of a column 10 with a common central axis, and a flexible stress transmission plate 30 has a common central axis on the lower surface side of the base plate 20. Are superimposed. The stress transmission plate 30 has a square shape larger than the base plate 20, and has a portion extending outward from the base plate 20 when superimposed on the base plate 20. The stress transmission plate 30 is joined to the base plate 20 by one bolt 40 at the center, and joined to the concrete foundation 60 by four bolts 50 near the periphery near the four apexes extending outward from the base plate 20. When bending stress or the like is generated in the column 10, a portion between the bolt 40 and the bolt 50 of the stress transmission plate 30 is bent and absorbs the stress.
[Selection] Figure 1

Description

  The present invention relates to a column base of a building that is provided at the lower end of a column of a building and is fixed to a concrete foundation, and particularly minimizes the size of the foundation on which the column base is fixed with a simple configuration. It relates to the column base of a building.

  Pillars of buildings (including workpieces) are erected on concrete foundations that are placed in the ground or at low levels above the ground. The column base near the bottom of the column is fixed to the concrete foundation in various ways. Japanese Patent Application Laid-Open No. 2008-2109 discloses a structure of a column base portion in which a protruding portion of an anchor bolt embedded in a foundation is inserted into an anchor bolt insertion hole of a base plate and tightened with a nut. In such a configuration, the proof strength of the pillars standing on it is used as a standard, and is designed to have a so-called 100% proof stress that is greater than the proof strength of the pillars. The size of the product had to be very large and robust. As the scale of concrete foundations increased, more materials such as concrete and rebar had to be used. Japanese Patent Laid-Open No. 10-299081 discloses a configuration in which a spring member 5 is inserted between the base plate 2 and the nut 2 of the anchor bolt 6 and between the base plate 2 and the upper surface of the foundation reinforced concrete 3. In Japanese Patent Laid-Open No. 2002-4422, the steel column 4 is tiltable with respect to the base plate 3 in a state where the upper surface of the base plate 3 and the lower end surface of the steel column 4 are cut off, and has low yield as an energy absorbing member. The structure connected by the point steel panel 5 is disclosed. These can adjust the fixing degree of the column bases to reduce the scale of the foundation, but the structure is complicated, so the work in the factory and the field becomes complicated, and high precision is required for the design and production of the members, so the cost Was inviting the rise.

JP 2008-2109 A Japanese Patent Laid-Open No. 10-299081 JP 2002-4422 A

  Accordingly, an object of the present invention is to provide a building column base that can minimize the scale of a concrete foundation to which the column base is fixed with a simple configuration.

  In order to achieve the above object, according to the present invention, in the building column base for fixing the lower end of the building column on the concrete foundation, the upper surface is welded over the entire circumference of the lower edge of the column. And a base plate fixed to the lower end of the pillar, and a portion of the lower surface of the base plate that is overlapped with a central axis in common and that extends outward from the base plate when superimposed, at least approximately 1 at the center. A column base portion of the building was constructed including a flexible stress transmission plate joined to the base plate by a plurality of bolts and joined to the concrete foundation by a plurality of bolts in the vicinity of substantially the entire periphery.

  In the column base of the building according to the present invention, the column of the building is fixed to the concrete foundation via a stress transmission plate. The stress transmission plate is joined to the base plate fixed to the lower end of the column at substantially the center, is joined to the concrete foundation near the entire periphery, and has flexibility. Therefore, when the concrete foundation rotates in the event of an earthquake or the like, the stress transmission plate bends between the center and the periphery, so that at least a part of the bending stress generated in the column can be absorbed.

  The base plate and the stress transmission plate, and the stress transmission plate and the concrete foundation are bolt-bonded, and it is preferable that all of them are bolt-bonded in terms of the effect of stress transmission. The stress transmission plate is configured to have flexibility, but is preferably made of, for example, a steel plate.

  As described above, according to the column base portion of a building and the fixing method thereof according to the present invention, the scale of the concrete foundation can be kept small, so that the material cost can be reduced and the construction period can be shortened to reduce the cost. be able to.

FIG. 1 is a front view showing a first embodiment of a column base of a building according to the present invention, in which a concrete foundation portion is represented by a cross section, and a lower portion of a concrete foundation portion and an upper portion of a column are omitted. It is shown. FIG. 2 is a plan view showing the column base portion of the building of FIG. 1, in which the layers below the stress transmission plate are omitted. FIG. 3 is a front view similar to FIG. 1 showing the operation of the first embodiment with respect to tensile stress, and the deformation of each member with respect to the stress is shown slightly exaggerated. FIG. 4 is a front view similar to FIG. 1 showing the operation of the first embodiment with respect to bending stress, and the deformation of each member with respect to the stress is shown slightly exaggerated. FIG. 5 is a view similar to FIG. 1 showing a second embodiment of the column base portion of the building according to the present invention. FIG. 6 is a view similar to FIG. 2 showing a second embodiment of the column base portion of the building according to the present invention. FIG. 7 is a view similar to FIG. 2 showing a third embodiment of the column base portion of the building according to the present invention.

  Hereinafter, the best mode of the column base part of the building concerning the present invention is explained in detail, referring to drawings. The following description is for the purpose of understanding the invention more deeply and is not intended to limit the scope of the claims.

[First Embodiment]
1 and 2 show a first embodiment of a column base part of a building according to the present invention. In each figure, at the lower end of the first floor column 10 of the building, which is a steel pipe prism, a base plate made of a steel plate that covers the lower end opening and is a square shape that is slightly larger than the shape of the cross section of the column 10. The upper surface of 20 is attached with a common central axis. The base plate 20 is fixed to the lower end of the column 10 by welding the lower edge of the column 10 to the entire upper surface of the base plate 20.

  The stress transmission plate 30 is superimposed on the lower surface side of the base plate 20 with a common central axis. The stress transmission plate 30 has a square shape larger than the base plate 20, and has a portion extending outward from the base plate 20 when superimposed on the base plate 20. The stress transmission plate 30 is joined to the base plate 20 by one bolt 40 at the center, and joined to the concrete foundation 60 by four bolts 50 near the periphery near the four apexes extending outward from the base plate 20. A mortar base 70 for height adjustment is interposed between the stress transmission plate 30 and the concrete foundation 60.

  The bolts 40 and 50 that join the base plate 20 and the stress transmission plate 30 and the stress transmission plate 30 and the concrete foundation 60 are high-strength bolts, both of which are joined by high-strength bolts. Further, the stress transmission plate 30 is made of a flexible steel plate, and specifically, an SS400 steel plate is used. However, SM490, SN490C, and the like can also be used. SS400 can also be used for the base plate 20. The thickness of the stress transmission plate 30 varies depending on the size of the pillar 10 and the scale of the building, but is usually in the range of 9 to 40 mm.

  Next, the process of fixing the column 10 to the concrete foundation 60 will be described.

  A base plate 20 and a stress transmission plate 30 are attached to the column 10 in advance in the factory. First, the base plate 20, whose shape is prepared in advance and in which the bolt holes are formed, and the stress transmission plate 30 are joined by the bolts 40. By superposing the base plate 20 on the upper surface side of the stress transmission plate 30 and tightening the nut 42 to the bolt 40 protruding from the upper surface of the base plate 20, the base plate 20 and the stress transmission plate 30 are joined by high-strength bolts. Subsequently, the base plate 20 is attached to the column 10 by bringing the lower end of the column 10 into contact with the upper surface of the base plate 20 and welding the edge of the lower end over the entire circumference. The column 10 to which the base plate 20 and the stress transmission plate 30 are attached is conveyed to the building site.

  The concrete foundation 60 has already been cast at the construction site, and the upper ends of the four bolts 50 protrude from predetermined positions on the upper surface of the concrete foundation 60. Before the column 10 is erected, the height of the column 10 is adjusted by the mortar base 70. At this time, the mortar base 70 is created so as not to interfere with the head of the bolt 40 protruding from the lower surface of the stress transmission plate 30.

  When the height adjustment is completed, the column 10 is suspended by a crane, placed on the concrete foundation 60 so that the bolt 50 is inserted into each bolt hole of the stress transmission plate 30, and each nut 52 is tightened to thereby stress. The transmission plate 30 and the concrete foundation 60 are friction-joined with high strength bolts, and the column 10 is fixed to the concrete foundation 60.

  Next, the operation of the first embodiment will be described with reference to FIGS.

  In the column base portion of the building according to the present embodiment, when tensile stress is generated in the column 10 as shown in FIG. 3, the flexible stress transmission plate 30 is pulled by the bolt 40, and the bolt 40 and the bolt 50. And the center part is lifted to absorb the stress. When the tensile stress of the column 10 disappears, the stress transmission plate 30 returns to the original state as shown in FIG. FIG. 4 shows a state in which bending stress is generated in the column 10, and the column 10 is inclined to the right in the drawing, and the stress is absorbed by mainly bending the left part of the stress transmission plate 30.

  Therefore, according to the column base part of the building which concerns on 1st Embodiment, it is possible to design freely the allowable value of the deformation | transformation of the whole building which changes with each building. Therefore, the scale and robustness of the concrete foundation can be suppressed to the necessary minimum, thereby reducing the cost by reducing the material cost and the construction period.

[Second Embodiment]
5 and 6 show a second embodiment of a column base of a building according to the present invention.

  The second embodiment is for a building having a larger scale than the first embodiment, and the pillar 110 on the first floor of the building, which is a prism made of steel pipe, is the pillar 10 of the first embodiment. Than thicker. At the lower end of the column 110, the upper surface of the base plate 120 made of a steel plate that is a square shape that is slightly larger than the shape of the cross section of the column 10 is welded to the lower edge of the column 10 over the entire circumference. Thus, the column 110 is fixed to the lower end.

  The stress transmission plate 130 is superposed on the lower surface side of the base plate 120 and joined to the base plate 120 by bolts 140 arranged in four square shapes around the central axis, and at the peripheral portion extending outward from the base plate 120. , It is joined to the concrete foundation 160 by nine bolts 150 near and in the middle. Each of the bolts 140 and 150 is a high strength bolt, and the stress transmission plate 130 is made of a steel plate and has flexibility. The base plate 120 is also made of a steel plate.

  The second embodiment is also fixed to the concrete foundation 160 by the same process as the first embodiment, and when stress is generated in the pillar 110, the stress transmission plate 130 is bent as in the first embodiment. Stress can be absorbed.

[Third Embodiment]
In FIG. 7, 3rd Embodiment of the column base part of the building which concerns on this invention is shown.

  In the third embodiment, the building pillar 210 is a cylinder. The other base plate 220, stress transmission plate 230, and bolts 240 and 250 are the same members as those in the first embodiment, and are fixed to the concrete foundation by the same process, and have the same effects.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it is needless to say that modifications can be appropriately made within the scope of the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Column 20 ... Base plate 30 ... Stress transmission plate 40, 50 ... Bolt 60 ... Concrete foundation

Claims (3)

In the column base of the building to fix the lower end of the building column on the concrete foundation,
A base plate fixed to the lower end of the column by welding an upper surface over the entire periphery of the lower edge of the column;
The base plate is superposed on the lower surface side of the base plate in common, and has a portion extending outward from the base plate when superposed, and is joined to the base plate by at least one bolt at substantially the center, and has a substantially entire periphery. A building column base comprising a flexible stress transmission plate connected to the concrete foundation by a plurality of bolts nearby.   The base of the building according to claim 1, wherein the base plate and the stress transmission plate, and the stress transmission plate and the concrete foundation are all joined by high-strength bolts.   The column base of a building according to claim 1 or 2, wherein the stress transmission plate is made of a steel plate.