JP7621177B2 - Column base structures and buildings - Google Patents

Description

The present invention relates to a column base structure and a building equipped with this base structure.

Patent Document 1 describes a building construction method on soft ground. Specifically, a level adjustment plate is placed between the base plate attached to the bottom end of the building's column base and the building frame so that the thickness is set to a predetermined level for each location. This level adjustment plate is placed so that it can be freely inserted and removed from a predetermined direction.

Japanese Patent Application Publication No. 6-146596

In a building with multiple columns, uneven settlement can cause the vertical position of one column to move relative to the vertical positions of the other columns. This causes the columns to experience forced displacement and forced stress due to the forced displacement.

As a conventional solution to this problem, an adjustment plate that adjusts the vertical position of one of the pillars is placed between the bottom end of the pillar and the foundation body so that it can be inserted and removed freely. Specifically, multiple adjustment plates are stacked, and the pillar is attached to the foundation body with anchor bolts inserted into through holes formed in the adjustment plates.

Here, the frictional force generated between one adjustment plate and the other adjustment plate may be weak when only the long-term vertical axial force is applied to the column. In such a case, when a horizontal external force is applied to the column, the one adjustment plate will shift horizontally relative to the other adjustment plate, reducing the efficiency of transmission of the horizontal force from the column to the foundation structure.

The objective of the present invention is to prevent a decrease in the efficiency of transmission of horizontal force from the pillar to the foundation body in a configuration in which an adjustment plate for adjusting the vertical position of the pillar is disposed between the pillar and the foundation body.

The column base structure described in claim 1 is characterized by comprising: a base plate supporting at least one of a plurality of columns provided in a building; a support plate disposed below the base plate and attached to a foundation body; an adjustment plate that is stacked between the support plate and the base plate and is smaller than the base plate in a plan view and that can be inserted and removed to adjust the vertical position of the one column; an anchor bolt that is inserted into a through hole formed in the adjustment plate and attaches the one column to the foundation body; and a pressing member that is disposed outside the adjustment plate in a plan view and presses the base plate toward the foundation body.

According to the configuration of claim 1, an adjustment plate is inserted and removed between the base plate supporting one of the columns and the support plate attached to the foundation body to adjust the vertical position of the one of the columns. Furthermore, a pressing member is arranged on the outer side of the adjustment plate in a plan view to press the base plate against the foundation body.

In this way, by the pressing member pressing the base plate toward the foundation body, the frictional force generated between the first adjustment plate and the other adjustment plate becomes stronger than when the pressing member is not pressed. This makes it possible to suppress a decrease in the efficiency of transmission of horizontal force from the first pillar to the foundation body in a configuration in which an adjustment plate that adjusts the vertical position of the first pillar is disposed between the first pillar and the foundation body.

The column base structure described in claim 2 is characterized in that in the column base structure described in claim 1, the pressing member comprises a pressing bolt whose lower end portion is fixed to the support plate and extends upward and is inserted into a through hole formed in the base plate, and a nut that is fastened to the pressing bolt at the portion that protrudes upward from the base plate.

According to the configuration of claim 2, the base plate is pressed against the foundation body by tightening the nut onto the pressing bolt. In this way, the base plate can be pressed against the foundation body with a simple configuration.

The column base structure described in claim 3 is characterized in that, in the column base structure described in claim 2, the pressing bolts are provided in multiple numbers and are arranged to surround the adjustment plate in a plan view.

According to the column base structure of claim 3, the pressing bolts are arranged to surround the adjustment plate in a plan view. This allows the entire base plate to be pressed against the foundation body.

The column base structure described in claim 4 is the column base structure described in any one of claims 1 to 3, characterized in that the base plate supports the first column via a sliding bearing.

According to the column base structure of claim 4, the base plate supports the first column via a sliding bearing. Therefore, the efficiency of transmission of horizontal force from the first column to the base plate is reduced compared to when no sliding bearing is provided. This makes it possible to prevent the first adjustment plate and the other adjustment plate, which overlap each other, from shifting in the horizontal direction.

The building described in claim 5 is characterized by having a beam that connects the upper end of one column to the upper end of another column, and a column base structure described in any one of claims 1 to 4 that constitutes the base of the one column.

According to the building of claim 5, the base of one of the columns is provided with the column base structure of any one of claims 1 to 4. For example, if the other column moves vertically downward due to uneven settlement, the adjustment plate of the column base structure provided at the base of the one column is removed, causing the one column to move vertically downward. This makes it possible to suppress forced displacement and forced stress caused by forced displacement in the one column, the other column, and the beam.

According to the present invention, in a configuration in which an adjustment plate for adjusting the vertical position of the column is disposed between the column and the foundation body, it is possible to suppress a decrease in the efficiency of transmission of horizontal force from the column to the foundation body.

1A and 1B are schematic diagrams showing a building according to a first embodiment of the present invention. FIG. 6 is a cross-sectional view of the column base structure according to the first embodiment of the present invention taken along line A-A in FIG. 5 . FIG. 1 is a perspective view showing a column base structure according to a first embodiment of the present invention. FIG. 1 is a plan view showing a column base structure according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing an adjustment plate of the column base structure according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing a column base structure according to a second embodiment of the present invention. FIG. 11 is an enlarged cross-sectional view showing a column base structure according to a third embodiment of the present invention.

First Embodiment
A column base structure and a building according to a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 5. Note that the arrow H shown in the figures is a vertical direction indicating the height direction of the building, the arrow W is a horizontal direction indicating the width direction of the building, and the arrow L is a horizontal direction indicating the depth direction of the building. Note that the arrows W and L are perpendicular to each other.

(Building 140)
As shown in Fig. 1 (A), the building 140 includes a steel pipe column 100, a steel pipe column 110 arranged apart from the steel pipe column 100 in the building width direction, and a beam 120. The steel pipe column 100 and the steel pipe column 110 have a rectangular tubular cross section. The beam 120 extends in the building width direction and connects the upper end of the steel pipe column 100 and the upper end of the steel pipe column 110. The steel pipe column 100 is an example of one column, and the steel pipe column 110 is an example of the other column.

(Column base structure 10)
2 and 3, the column base structure 10 includes a base plate 12 supporting a steel pipe column 100, a support plate 16 partially embedded in a foundation structure 150, and a plurality of adjustment plates 36. Note that the support plate 16 only needs to be directly or indirectly attached to the foundation structure 150, and may be raised using adjustment mortar, for example.

The column base structure 10 also includes an anchor bolt 20 that attaches the steel pipe column 100 to the foundation body 150, and a nut 22 that is fastened to the anchor bolt 20. The column base structure 10 also includes a pressing bolt 26 that presses the base plate 12 toward the foundation body 150, and a nut 28 that is fastened to the pressing bolt 26.

[Base plate 12]
The base plate 12 supporting the steel pipe pole 100 is attached to the lower end of the steel pipe pole 100 and has a rectangular shape in a plan view. Two wing plates 102 are attached to each corner of the rectangular steel pipe pole 100 by welding, as shown in Figs. 3 and 4. Specifically, one side of each of the two wing plates 102 is attached to each corner of the steel pipe pole 100 by welding so as to be perpendicular to each other in a plan view. The base plate 12 is attached to the lower end of the steel pipe pole 100 and the other side of the wing plate 102 by welding.

As shown in FIG. 2, the base plate 12 is formed with a plurality of through holes 12a into which the upper end portions of the anchor bolts 20 are inserted, and a plurality of through holes 12b into which the upper end portions of the pressing bolts 26 are inserted. Specifically, as shown in FIG. 4, twelve through holes 12a are formed so as to surround the steel pipe column 100 in a plan view, and eight through holes 12b are formed so as to surround the twelve through holes 12a. More specifically, the twelve through holes 12a are arranged at equal intervals so as to form a rectangle in a plan view, and the eight through holes 12b are arranged at equal intervals so as to form a rectangle in a plan view.

[Support plate 16]
2, the support plate 16 is disposed below the base plate 12. Furthermore, the support plate 16 has a rectangular shape in a plan view, and is partially embedded in the foundation structure 150 as described above.

The support plate 16 is also formed with a number of through holes 16a into which the lower end portions of the anchor bolts 20 are inserted, and through holes 16b into which the lower end portions of the pressing bolts 26 are inserted. Specifically, the through holes 16a of the support plate 16 are formed so as to overlap with the through holes 12a of the base plate 12 in a plan view, and the through holes 16b of the support plate 16 are formed so as to overlap with the through holes 12b of the base plate 12 in a plan view.

[Anchor bolt 20, nut 22]
Twelve anchor bolts 20 are provided, extending in the vertical direction, and are arranged so as to surround the steel pipe column 100 in a plan view, as shown in Fig. 4. The lower end portions of the anchor bolts 20 are inserted into the through holes 16a of the support plate 16 and embedded inside the foundation structure 150, as shown in Fig. 2.

The upper end portion of the anchor bolt 20 is inserted into the through hole 12a of the base plate 12 and protrudes above the base plate 12. A nut 22 is fastened to the portion of the anchor bolt 20 that protrudes above the base plate 12. In addition, multiple adjustment plates 36 are arranged in a stacked state between the support plate 16 and the base plate 12.

In this configuration, the steel pipe column 100 is attached to the foundation structure 150 via multiple adjustment plates 36 by tightening the nut 22 onto the anchor bolt 20.

[Adjustment plate 36]
The adjustment plate 36 is a so-called filler plate, and a plurality of adjustment plates 36 are provided and arranged in a stacked state between the base plate 12 and the support plate 16 as shown in Fig. 2. In the present embodiment, the thickness of the adjustment plate 36 is set to 40 mm as an example. As shown in Fig. 4, the outer shape of the adjustment plate 36 is a rectangle that is larger than the steel pipe column 100 in a plan view and smaller than the base plate 12 in a plan view.

As shown in FIG. 5, the adjustment plate 36 has a rectangular cutout in the center. Furthermore, the adjustment plate 36 has 12 through holes 40 into which the anchor bolts 20 (see FIG. 2) are respectively inserted. The through holes 40 are arranged at equal intervals so as to form a rectangle in a plan view.

The adjustment plate 36 is divided into eight plate sections 38. Specifically, four plate sections 38 are arranged on the outside of the rectangle formed by the arrangement of the multiple through holes 40, and four plate sections 38 are arranged on the inside. The eight plate sections 38 are in the shape of strips.

Of the four outer plate sections 38, two plate sections 38 (hereinafter sometimes referred to as "plate sections 38a") are arranged facing each other in the building depth direction (arrow L direction), and two plate sections 38 (hereinafter sometimes referred to as "plate sections 38b") are arranged facing each other in the building width direction (arrow W direction). Furthermore, plate sections 38a are longer than plate sections 38b, and plate sections 38b are each arranged between a pair of plate sections 38a.

Of the four inner plate sections 38, two plate sections 38 (hereinafter sometimes referred to as "plate sections 38c") are arranged facing each other in the depth direction of the building, and two plate sections 38 (hereinafter sometimes referred to as "plate sections 38d") are arranged facing each other in the width direction of the building. Furthermore, plate sections 38d are longer than plate sections 38c, and plate sections 38c are each arranged between a pair of plate sections 38d.

The plate portions 38a, 38b, 38c, and 38d each have an arc-shaped edge portion formed thereon to form the through hole 40. In other words, the through hole 40 of the adjustment plate 36 is formed by combining the edges formed on the plate portion 38.

In this configuration, when the pressing force pressing the base plate 12 toward the foundation body 150 is weakened, the plate portions 38a, 38b, 38c, and 38d are inserted and removed separately from between the base plate 12 and the support plate 16. In other words, the adjustment plate 36 is inserted and removed from between the base plate 12 and the support plate 16. And, by inserting and removing the adjustment plate 36 from between the base plate 12 and the support plate 16, the vertical position of the steel pipe column 100 is adjusted.

[Press bolt 26, nut 28]
There are eight press bolts 26, which are arranged to surround the anchor bolts 20 and the adjustment plate 36 in a plan view as shown in Fig. 4. Furthermore, the press bolts 26 extend in the vertical direction as shown in Fig. 2. The lower end portions of the press bolts 26 are inserted into the through holes 16b of the support plate 16, and the heads 26a of the press bolts 26 are arranged below the support plate 16. In this way, the lower end portions of the press bolts 26 are fixed to the support plate 16.

The upper end portion of the pressing bolt 26 is inserted into the through hole 12b of the base plate 12 and protrudes above the base plate 12. A nut 28 is then tightened to the portion of the pressing bolt 26 that protrudes above the base plate 12.

In this configuration, by tightening the nut 28 onto the pressing bolt 26, the base plate 12 is pressed toward the foundation body 150, and the frictional force generated between one adjustment plate 36 and the other adjustment plate 36 is increased.

(Action)
1(A) and 1(B), the uneven settlement may cause the vertical position of the steel pipe column 100 to move relative to the vertical position of the steel pipe column 110. Specifically, the vertical position of the steel pipe column 110 may move downward relative to the vertical position of the steel pipe column 100. This causes forced displacement and forced stress caused by the forced displacement to occur in the steel pipe column 100, the steel pipe column 110, and the beam 120.

In such a case, the adjustment plate 36 of the column base structure 10 provided at the lower end of the steel pipe column 100 shown in Figure 2 is removed. Specifically, the steel pipe column 100 is jacked up with the nuts 22 and 28 loosened. In this state, the plate portions 38a, 38b, 38c, and 38d shown in Figure 5 are removed separately. The number of adjustment plates 36 corresponding to the amount of downward movement of the steel pipe column 100 is removed.

Then, after removing the adjustment plate 36, the steel pipe pole 100 is jacked down, and the nut 22 and nut 28 are tightened onto the anchor bolt 20 and the pressing bolt 26 to complete the work. This makes the vertical position of the steel pipe pole 100 the same as the vertical position of the steel pipe pole 110.

(summary)
As described above, in the building 140, when the steel pipe column 110 moves downward due to uneven settlement, the adjustment plate 36 of the column base structure 10 provided at the lower end of the steel pipe column 100 is removed. As a result, the vertical position of the steel pipe column 110 becomes equal to the vertical position of the steel pipe column 110.

In addition, in the building 140, the vertical position of the steel pipe column 100 is equivalent to the vertical position of the steel pipe column 110, so that the occurrence of forced displacement and forced stress caused by the forced displacement can be suppressed for the steel pipe column 100, the steel pipe column 110, and the beam 120.

In addition, in the column base structure 10, the base plate 12 is pressed against the foundation body 150 by tightening the nut 28 onto the pressing bolt 26. This makes it possible to strengthen the frictional force generated between the first adjustment plate 36 and the other adjustment plate 36 compared to when the base plate 12 is not pressed. It is also possible to strengthen the frictional force generated between the first adjustment plate 36 and the other adjustment plate 36 by tightening the nut 22 onto the anchor bolt 20. However, in the pressing bolt 26 and the nut 28, the base plate 12 can be efficiently pressed against the foundation body 150 by pressing the base plate 12 against the foundation body 150 on the outer side (the side away from the steel pipe column 100) of the anchor bolt 20.

In addition, in the column base structure 10, by increasing the frictional force generated between one adjustment plate 36 and another adjustment plate 36, it is possible to prevent the overlapping one adjustment plate 36 and another adjustment plate 36 from shifting in the horizontal direction.

In addition, in the column base structure 10, by preventing one adjustment plate 36 from shifting horizontally from the other adjustment plate 36, it is possible to prevent a decrease in the efficiency of transmission of horizontal force from the steel pipe column 100 to the foundation body 150.

In addition, in the column base structure 10, the pressing bolts 26 are arranged to surround the adjustment plate 36 in a plan view. This allows the entire base plate 12 to be pressed against the foundation body 150.

Second Embodiment
A column base structure and a building according to a second embodiment of the present invention will be described with reference to Fig. 6. Note that, regarding the second embodiment, differences from the first embodiment will be mainly described.

(composition)
In a building 340 of the second embodiment, as shown in Fig. 6, the base plate 12 of the column base structure 10 supports a steel pipe column 200 via a sliding bearing 220. The steel pipe column 200 is an example of a first column.

The steel pipe column 200 has a rectangular tubular cross section, and wing plates 202 are attached to each corner of the steel pipe column 200 by welding. Specifically, one side of each of the two wing plates 202 is attached to each corner of the steel pipe column 200 by welding so that they are perpendicular to each other in a plan view. A column base plate 212, which is rectangular in a plan view, is attached to the lower end of the steel pipe column 200 and the other side of the wing plate 202 by welding.

A sliding bearing 220 is disposed between the column base plate 212 and the base plate 12. The sliding bearing 220 includes a support portion 220a fixed to the column base plate 212, a sliding member 220b provided on the underside of the support portion 220a, and a sliding plate 220c fixed to the base plate 12.

(summary)
In this configuration, the efficiency of transmitting horizontal force from the steel pipe column 200 to the base plate 12 decreases compared to when a sliding bearing is not provided. Therefore, it is possible to suppress the horizontal displacement of one overlapping adjustment plate 36 and the other adjustment plate 36.

Third Embodiment
A column base structure and a building according to a third embodiment of the present invention will be described with reference to Fig. 7. Note that, regarding the third embodiment, differences from the first embodiment will be mainly described.

(composition)
7, in the column base structure 310 according to the third embodiment, a nut 328 fastened to the press bolt 26 is provided on the opposite side of the base plate 12 to the nut 28 fastened to the press bolt 26. In other words, the base plate 12 is sandwiched between the nut 28 and the nut 328. That is, the outer peripheral portion of the base plate 12 is sandwiched between the nuts 28 and the nuts 328 at multiple points along the outer peripheral edge.

(summary)
In this way, the outer peripheral portion of the base plate 12 is sandwiched between the nuts 28 and the nuts 328 at multiple points along the outer peripheral edge, thereby determining the vertical position of the outer peripheral portion of the base plate 12. This makes it possible to adjust the level of the base plate 12.

In addition, the steel pipe column 100 can be jacked up using the nut 328 by loosening the nut 28 and rotating the nut 328 to lift the base plate 12.

Although the present invention has been described in detail with respect to the first, second, and third specific embodiments, it will be apparent to those skilled in the art that the present invention is not limited to these embodiments, and that various other embodiments are possible within the scope of the present invention. For example, the above embodiment has been described using a steel pipe column 100, but it may also be a steel column, a reinforced concrete column, a steel reinforced concrete column, a wooden column, etc.

In addition, in the above embodiment, a steel pipe column 100 with a rectangular tubular cross section was used, but the cross-sectional shape of the column may be a steel pipe column with a cylindrical cross section, an H-shaped steel, or another shape.

Although not specifically described in the above embodiment, the building may be of steel frame construction, concrete-filled steel pipe construction, steel-framed reinforced concrete construction, reinforced concrete construction, wood construction, or other construction.

In addition, in the above embodiment, the base plate 12 and the support plate 16 are rectangular in plan view, but they may be circular, polygonal, or other shapes in plan view.

10 Column base structure 12 Base plate 12b Through hole 16 Support plate 20 Anchor bolt 26 Press bolt 28 Nut 36 Adjustment plate 40 Through hole 100 Steel pipe column (an example of a first column)
110 Steel pipe column (an example of another column)
120 Beam 140 Building 150 Foundation frame 200 Steel pipe column (an example of a first column)
220 Sliding bearing 310 Column base structure 340 Building

Claims (5)

A base plate supporting at least one of a plurality of columns provided in a building;
A support plate disposed below the base plate and attached to a foundation body;
an adjustment plate that is overlapped between the support plate and the base plate and is smaller than the base plate in a plan view, and that is inserted and removed to adjust the vertical position of the one column;
An anchor bolt that is inserted into a through hole formed in the adjustment plate and attaches the first column to the foundation body;
A pressing member that is disposed on the outer side of the adjustment plate in a plan view and presses the base plate against the foundation body;
A column base structure equipped with: The pressing member includes a pressing bolt having a lower end portion fixed to the support plate and extending upward and inserted into a through hole formed in the base plate, and a nut fastened to the pressing bolt at a portion protruding upward from the base plate;
The column base structure according to claim 1 . The pressing bolts are provided in plurality and are arranged so as to surround the adjustment plate in a plan view.
The column base structure according to claim 2. The base plate supports the first column via a sliding bearing.
The column base structure according to any one of claims 1 to 3. A beam connecting an upper end of one pillar to an upper end of the other pillar;
A column base structure according to any one of claims 1 to 4 constituting a base portion of the one column;
A building equipped with: