JP2002054154A - Foundation execution method of steel framed building and column base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation execution method of a steel framed building and column bases used for the foundation execution method of the steel framed building capable of increasing dimentional tolerances between the column bases, accurately setting thereby steel framed columns on the ground side, at the same time, receiving load dispersed from the steel framed columns on the ground side and increasing thereby the rigidity of the whole foundation. SOLUTION: The foundation execution method of the steel framed building includes a process for setting a plurality of column bases 6 connected to the steel framed columns 8 on the ground side in specific positions on a base floor 5, a process for erecting connecting beams 10 among a plurality of column bases 6 and a process for placing a base concrete 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation construction method for a steel frame building and a column base used for the foundation construction method for the steel frame building.

[0002]

2. Description of the Related Art Conventionally, a steel building has been constructed by connecting a steel column on the ground side to an anchor bolt on a foundation made of basic concrete having anchor bolts arranged at predetermined positions. I am trying to do it. The foundation of such a steel-framed building is usually constructed by digging the ground, laying rockstone etc. on the bottom, pouring discarded concrete, and after summing up, placing the pillars at predetermined positions on the discarded concrete. By installing the legs, installing the anchor bolts, and then laying the foundation concrete after the reinforcement,
We are going to construct.

[0003] In recent years, on the foundation of such a steel frame building, in order to accurately join a steel column on the ground side and the anchor bolt, an anchor bolt is supported in a state where the anchor bolt is previously positioned on a column base. For example, for example,
-37466.

[0004]

However, Japanese Patent Laid-Open No.
Even if a column base proposed in, for example, Japanese Patent No. 37466 is used, a steel column on the ground side and an anchor bolt can be accurately joined, but only a reinforcing bar is arranged between the column bases. However, the dimensional accuracy between them cannot be improved, and the dimensional position between the column bases may be shifted depending on the construction method or the like.

[0005] Each column base is joined to each steel column on the ground side via an anchor bolt. However, since a load from each steel column on the ground side is received by each column base, each column base is connected to each column base. Sufficient proof stress is required.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to improve the dimensional accuracy between column bases, whereby the accuracy of each steel frame column on the ground side can be improved. It can be installed well and can receive the load from each steel column on the ground side in a distributed manner, thereby increasing the rigidity of the entire foundation. The present invention relates to a column base used for a foundation construction method of a steel building.

[0007]

According to a first aspect of the present invention, there is provided a foundation construction method for a steel frame building, wherein a column base joined to a ground-side steel column is provided on a base floor. The method is characterized in that the method includes a step of installing a plurality of pieces at predetermined positions, a step of laying a connecting beam between the plurality of column pedestals, and a step of placing foundation concrete.

According to such a method, since the column bases are connected by the connecting beam, even after the foundation concrete is cast, no displacement occurs.
The dimensional accuracy between the column bases is favorably maintained. Therefore, each steel column on the ground side can be accurately installed. In addition, the load from each steel column on the ground side is applied to each column base, but since the load is dispersed through the connecting beam,
The rigidity of the entire foundation can be increased. Therefore, a reliable and strong foundation can be constructed.

The invention described in claim 2 is the first invention.
In the invention described in the above, the column base is erected on a base floor, and a column portion joined to a steel column on the ground side, and a plurality of columns extending sideways from the column portion and connecting with the connection beam. And a connecting portion of

When such a column base is used, after connecting each column base on the base floor and connecting the connecting portion to the connecting beam, the connecting beam is easily and reliably installed between the plurality of column bases. be able to. Therefore, it is possible to improve the mounting accuracy of the connecting beam while improving the working efficiency.

[0011] The invention according to claim 3 is based on claim 1.
In the invention described in (2), the connection beam is made of H steel.

When the connecting beam is made of H steel, the rigidity can be reliably increased while being easily available.

According to a fourth aspect of the present invention, there is provided a column base used for a foundation of a steel frame building, wherein the column section is erected on a base floor and is joined to a steel column on the ground side, and a side from the column section. And a plurality of connecting portions for connecting the column bases to each other and a connecting beam for connecting the column bases to each other.

According to such a column base, since each column base can be connected via the connecting beam at the connecting portion, the position of each column base is displaced even after the foundation concrete is cast. Therefore, the dimensional accuracy between the column pedestals can be favorably maintained. Therefore, each steel column on the ground side can be accurately installed. In addition, the load from each steel column on the ground side is applied to each column base, but since the load can be dispersed through the connecting beam,
The rigidity of the entire foundation can be increased. Therefore, a reliable and strong foundation can be constructed. In addition, since the connecting portion can be easily and reliably connected to the connecting beam, it is possible to improve the work efficiency and improve the mounting accuracy of the connecting beam.

The invention described in claim 5 is the invention according to claim 4.
In the invention described in (1), the column portion is provided with an anchor bolt arranged at a predetermined position.

If the anchor bolt is provided at a predetermined position on the column, the anchor bolt can be joined with the steel column on the ground with high accuracy. Therefore, in the connecting portion, in addition to the fact that the respective column pedestals can be accurately joined via the connecting beam, it is possible to achieve a reliable foundation construction and to improve the working efficiency.

Further, the invention described in claim 6 is the same as claim 4.
In the invention described in Item 5, the connecting portion is made of H steel.

If the connecting portion is H steel, H steel can be used as the connecting beam. For this reason, the rigidity can be reliably increased while reducing the cost.

Further, the invention described in claim 7 is based on claim 4.
In the invention according to any one of (6) to (6), a flange portion is provided at each of an upper end portion and a lower end portion of the pillar portion, and the anchor bolt is provided between the upper end flange portion and the lower end flange portion. It is characterized by being erected and supported between them.

According to such a configuration, the anchor bolt is supported between the upper end flange and the lower end flange so that the anchor bolt can be reliably supported at a predetermined position of the pillar. it can. Therefore, it is possible to achieve more accurate joining with the steel column on the ground side.

[0021]

FIG. 1 is a diagram showing a construction site to which a foundation construction method for a steel building is applied, as an example of the present invention, FIG. 2 is a diagram showing how the construction site is dug, and FIG. Figure 4 laying and placing the base concrete.
FIG. 5 is a view in which spacers are installed at predetermined positions. FIG. 5 is a view in which a column base as an example of the present invention is installed on each spacer.
FIG. 7 is a view in which connecting beams are arranged between the column bases, FIG. 7 is a view in which each column base and the connecting beam are joined, FIG.
9 is a view in which foundation concrete is cast, FIG. 10 is a view showing a state in which steel columns on the ground side are joined, and FIGS. 11 and 12 are enlarged views of a main part in FIG. With reference to FIGS. 1 to 12, an example of the method of foundation construction of a steel frame building of the present invention and an example of the column base of the present invention will be described.

In this method of foundation construction of a steel frame building, first,
At a construction site for constructing a steel building having a site 1 as shown in FIG. 1, as shown in FIG.
Next, as shown in FIG. 3, after laying the chestnut stone 3 on the bottom surface 2, a base concrete (abandoned concrete) 4 is cast to construct a base floor 5.

Next, the pedestal 6 is arranged on the base floor 5. To place the column pedestal 6 on the base floor 5, first,
After the ink is printed out by a known method and the installation position of the column base 6 is specified, as shown in FIG. 4, the spacer 7 is installed at the position where the column base 6 is installed. The spacer 7 is installed to adjust the height of the column base 6 according to each construction site. In this method, the spacer 7 has a substantially box shape, but its shape is not limited at all. Not done. FIG.
In, the spacers 7 are respectively installed at the four corners of the base floor 5, but the installation positions are appropriately determined by each site.

Next, as shown in FIG. 5, the column base 6 is installed on each of the installed spacers 7. This pedestal 6
As shown in FIGS. 11 and 12, a column 9 for standing on the base floor 5 and joining to the steel frame column 8 on the ground side, and a connecting beam 10 extending laterally from the column 9 and described later, And two connection portions 11 for connection.

The column portion 9 is formed in a cylindrical shape having a substantially quadrangular cross section. A lower end portion of the column portion 9 is formed with a lower flange portion 12 having a substantially square plate shape extending toward the outer peripheral side. Also, a substantially quadrangular plate-like upper flange portion 13 extending to the outer peripheral side is formed. A substantially rectangular plate-shaped central flange portion 14 extending to the outer peripheral side is formed substantially at the center in the vertical direction. At four corners of the lower flange portion 12, the upper flange portion 13, and the center flange portion 14, insertion holes for supporting the anchor bolts 15 so that they can be inserted are formed. Four insertion holes in the flange portion 13 and the central flange portion 14
With each of the two anchor bolts 15 inserted,
The anchor bolts 15 are supported on the lower flange portion 12 and the upper flange portion 13 by screwing nuts.

The connecting portion 11 is provided so as to extend laterally from a substantially central portion of the outer peripheral surface of each side of the column portion 9. The column base 6 has two connecting portions 11. Are provided so as to extend at right angles to each other. Also,
Each of these connecting portions 11 is formed from H steel, and the side end portion to be joined to the column portion 9 is processed so as to have an I-shaped cross section, and then the lower side of the outer peripheral surface of the column portion 9. The flange 12 and the center flange 14 are joined by welding.

Then, as shown in FIG. 6, after the connecting beams 10 are arranged between the installed column bases 6, the respective column bases 6 and the connecting beam 10 are joined as shown in FIG. Each of the connecting beams 10 is made of H steel, and is processed in advance so as to correspond to the dimension between the column bases 6. Further, as shown in FIGS. 11 and 12, each column base 6 and each connection beam 10 are joined by a bolt via a relay plate 16. When jointed by bolts, even when a deformation stress is applied, it can be absorbed at this joint.

Then, as shown in FIG. 8, the reinforcing bar 17 is arranged. The reinforcing bars are arranged, for example, on the column base 6 with the hoop reinforcing bars at a predetermined interval, and in each connecting beam 10, the stapling bars are arranged at the predetermined interval, and the stapling bars and the connecting beams 10 are connected. Between them, arrange the main straight bar up and down. Further, on the base concrete 4 surrounded by each of the column bases 6 and each of the connecting beams 10, vertical and horizontal streaks are arranged in a grid pattern at predetermined intervals.

Thereafter, as shown in FIG. 9, a mold 18 is formed into a substantially rectangular frame so as to surround each pillar 6 and each connecting beam 10.
The foundation concrete 19 is cast to a predetermined position where the anchor bolts 15 are exposed, and after the foundation concrete 19 is dried, as shown in FIG. Is completed. In addition, on the foundation constructed in this way, for example, the steel column 8 on the ground side is
, A steel frame building will be constructed.

According to such a method, the space between the column pedestals 6 is
Since not only the reinforcing bars are arranged in the conventional manner, but also the connection by the connection beam 10, even after the foundation concrete 19 is cast, there is no positional displacement, and the dimensional accuracy between the column bases 6 is good. Is maintained. Therefore, each steel column 8 on the ground side can be accurately installed. Also,
In the foundation constructed in this manner, since a box structure can be formed by each column base 6 and each connection beam 10, the load from each ground-side steel column 8 is applied to each column base 6, Since the load is distributed via the connection beam 10, the rigidity of the entire foundation can be increased. Therefore, a reliable and strong foundation can be constructed.

In the column base 6 used for this foundation,
Since the connecting portion 11 is provided in advance, after each pillar 6 is installed on the base floor 5 and the connecting portion 11 is connected to the connecting beam 10, it is possible to easily and surely connect the plurality of pillars 6 to each other. A connecting beam 10 can be installed. Therefore, it is possible to improve the mounting accuracy of the connection beam 10 while improving the working efficiency.

In this foundation, since the connecting portion 11 and the connecting beam 10 of the column base 6 are made of H-steel, it is easy to obtain and work, the cost can be reduced, and the rigidity can be surely increased.

Further, an anchor bolt 15 is supported on the column 9 of the column base 6 between the upper flange 13 and the lower flange 12 so that the anchor bolt 15 is securely provided at a predetermined position of the column 9. Because it is supported, more accurate joining with the steel column 8 on the ground side is secured. Therefore, in the connecting portion 11, the connecting beam 10
In addition to the fact that the joining can be performed with high precision through the joint, it is possible to achieve a reliable foundation work and improve the working efficiency.

In the above description, the column portion 9 is formed in a cylindrical shape having a substantially quadrangular cross section, but the shape is not limited at all, and may be, for example, a cylindrical shape. The number of the connecting portions 11 is not limited to two at all. For example, three connecting portions 11 may be provided in a T shape or four connecting portions may be provided in a cross shape. Furthermore, the column base 6 does not need to be provided with the connecting portion 11 as long as it can be joined to the connecting beam 10.

[0035]

As described above, according to the first aspect of the present invention, the dimensional accuracy between the column pedestals is maintained favorably, whereby the steel frame columns on the ground side are accurately installed. Can be. In addition, since the load from each of the steel columns on the ground side can be dispersedly received, a reliable and strong foundation can be constructed.

According to the second aspect of the present invention, the column base and the connection beam can be connected easily and accurately.
It is possible to improve the mounting accuracy of the connecting beam while improving the working efficiency.

According to the third aspect of the present invention, by using H steel as the connecting beam, it is easy to obtain,
The rigidity can be reliably increased while reducing the cost.

According to the fourth aspect of the invention, it is possible to maintain the dimensional accuracy between the column pedestals in good condition, and to accurately install the steel columns on the ground side. In addition, since the load from each of the steel columns on the ground side can be dispersed, a reliable and strong foundation can be constructed. Further, since the column base and the connecting beam can be connected easily and accurately, the mounting efficiency of the connecting beam can be improved while the working efficiency can be improved.

According to the fifth aspect of the invention, it is possible to achieve a reliable foundation work and to improve the working efficiency.

According to the invention described in claim 6, when the connecting portion is H steel, H steel can be used as the connecting beam. For this reason, the rigidity can be reliably increased while reducing the cost.

According to the seventh aspect of the invention, it is possible to achieve more accurate joining with the steel column on the ground side.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a construction site to which a foundation construction method of a steel frame building is applied as an example of the present invention, wherein (a) is a plan view and (b) is a cross-sectional view.

FIGS. 2A and 2B are diagrams in which a construction site is dug, where FIG. 2A is a plan view and FIG.

FIGS. 3A and 3B are diagrams in which a base stone is cast by laying chestnut stone, wherein FIG. 3A is a plan view thereof and FIG. 3B is a cross-sectional view thereof.

FIGS. 4A and 4B are diagrams in which spacers are installed at predetermined positions after blackout, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view.

FIGS. 5A and 5B are diagrams in which column bases as an example of the present invention are installed on each spacer, FIG. 5A is a plan view thereof, and FIG.
Shows a sectional view thereof.

FIG. 6 is a view in which a connecting beam is arranged between each column base;
(A) is a plan view thereof, and (b) is a sectional view thereof.

FIG. 7 is a view in which each column base and the connection beam are joined,
(A) is a plan view thereof, and (b) is a sectional view thereof.

FIG. 8 is a diagram in which reinforcing bars are arranged, (a) is a plan view thereof,
(B) shows the sectional view.

FIG. 9 is a diagram in which foundation concrete is cast,
(A) is a plan view thereof, and (b) is a sectional view thereof.

10A and 10B are views showing a state in which steel columns on the ground side are joined, wherein FIG. 10A is a plan view thereof, and FIG. 10B is a sectional view thereof.

FIG. 11 is an enlarged view of a main part of FIG. 7 (a).

FIG. 12 is an enlarged view of a main part of FIG. 7 (b).

[Explanation of symbols]

 Reference Signs List 5 base floor 6 pillar base 8 steel column on ground side 9 pillar section 10 connecting beam 11 connecting section 12 upper flange section 13 lower flange section 15 anchor bolt 19 foundation concrete

Claims (7)

[Claims] 1. A step of installing a plurality of column bases to be joined to a steel column on the ground side at predetermined positions on a base floor; a step of laying a connecting beam between the plurality of column bases; A method for foundation construction of a steel frame building, including a step of casting. 2. A column, wherein the column is erected on a base floor and joined to a steel column on the ground, and a plurality of columns extending laterally from the column and connected to the connection beam. The method according to claim 1, further comprising a connecting portion. 3. The method according to claim 1, wherein the connecting beam is made of H steel. 4. A column base used for a foundation of a steel frame building, comprising: a column portion which is erected on a base floor and is joined to a steel column on the ground side; A pedestal comprising: a connecting beam for connecting to each other; and a plurality of connecting portions for connecting. 5. The column base according to claim 4, wherein the column portion is provided with an anchor bolt arranged at a predetermined position. 6. The column base according to claim 4, wherein the connecting portion is made of H steel. 7. A flange portion is provided at each of an upper end portion and a lower end portion of the pillar portion, and the anchor bolt is installed and supported between a flange portion at an upper end portion and a flange portion at a lower end portion. The pedestal according to any one of claims 4 to 6, wherein