JP7760304B2 - Root wrapping structure and root wrapping construction method - Google Patents

Description

The present invention relates to a root wrapping structure and a root wrapping construction method.

Root wrapping to protect pillars has been known in the past, as described, for example, in Patent Document 1.

Patent Document 1 describes a column base structure that protects steel pipe columns with root wrapping.

The base lining of the column base structure is made of reinforced concrete. Construction of this type of lining could not begin until the slab below the column had been formed. In other words, after the slab concrete was poured to form the slab, the reinforcement for the lining and formwork had to be installed on top of the slab, and then the concrete for the lining had to be poured and the lining installed.

However, when wrapping the roots in the manner described above, it is necessary for workers with various skills to be involved in the construction, which is very time-consuming. For this reason, there is a demand for a root-wrapping structure and a root-wrapping construction method that can reduce the amount of work required for construction.

Japanese Patent Application Laid-Open No. 2003-105859

The present invention was made in consideration of the above situation, and the problem it aims to solve is to provide a root wrapping structure and root wrapping construction method that can reduce the amount of work required for construction.

The above is the problem that this invention aims to solve, and next we will explain the means for solving this problem.

That is, in claim 1, it comprises a base material fixed to the side of the column, a panel fixed to the base material and covering the entire side of the column so that a gap is formed between the side of the column and the panel, and whose side constitutes the finished surface of the column's root wrapping, a bottom fixed to the column so as to close the gap between the side of the column and the panel from below, and concrete filled into the space partitioned by the side of the column, the panel and the bottom, in a state where it is separated from the concrete outside the space, including the concrete of the slab below the root wrapping .

In claim 2, the base material is formed in a substantially C-shape when viewed from above and in cross section, and the substantially C-shaped opening is provided between the panel and the side surface of the pillar .

In claim 3, the panel is made of metal .

In claim 4, the base material is fixed to the column by welding, the column has multiple side surfaces, and on one of the multiple side surfaces, two base materials are provided that have different protrusion dimensions from the one side surface when viewed in a plane .

In claim 5, the panel is composed of multiple divided members divided horizontally, and connecting portions are formed at the ends of each divided member to connect to other divided members, and the multiple divided members are fixed integrally to the base material with each connecting portion overlapping each other.

In claim 6, the connection portion forms a recess in the finished surface that is recessed toward the column.

In claim 7, there is provided a method for constructing root wrapping to protect a pillar, comprising a base material fixing process for fixing a base material to the side of the pillar; a bottom fixing process for fixing the bottom part that forms the bottom surface of the root wrapping to the pillar; a panel fixing process for placing a panel that covers the entire side of the pillar on the bottom part and fixing the panel to the base material before pouring the concrete of the slab below the root wrapping; and a concrete pouring process for pouring concrete inside the space partitioned by the side of the pillar, the panel and the bottom part , in a state where it is separated from the concrete outside the space, including the concrete of the slab .

In claim 8, the concrete pouring process is carried out simultaneously with the pouring of the concrete for the slab.

The effects of the present invention are as follows:

The present invention can reduce the labor required for installing the lining. It also allows for a clearance to be formed between the exterior concrete and the lining in case the column tilts, etc.

FIG. 1 is a plan view showing a root wrapping structure and a steel column according to a first embodiment of the present invention. A side view showing the root wrapping structure, steel columns and slab. An enlarged cross-sectional plan view showing the root wrapping structure and steel column. FIG. FIG. 10 is an exploded plan view showing how the panel is attached to the base member. 1 is a flowchart showing a construction method according to a first embodiment of the present invention. FIG. 10 is a side view showing the state before the panel is fixed to the base material. A side view showing concrete being poured into the space within the panel with the panel fixed to the base material. A plan view showing a root wrapping structure and a steel column according to a second embodiment of the present invention.

The following describes the root wrapping structure 10 according to the first embodiment of the present invention, using Figures 1 to 8. In the following description, the front-to-back, left-to-right, and up-to-down directions are defined based on the arrows in the figures.

The root wrapping structure 10 is a root wrapping structure that protects the steel column 1 at the bottom (slab 2 side) of the steel column 1.

Below, we will first explain the steel column 1 and slab 2.

The steel column 1 shown in Figures 1 and 2 is a column made of steel (iron). The steel column 1 is used, for example, in steel-framed buildings. The steel column 1 is formed into a cylindrical (rectangular) shape with a rectangular (approximately square) outer shape in plan view. A steel pipe measuring 500 mm x 500 mm, for example, can be used as the steel column 1. As shown in Figure 1, the steel column 1 has four side surfaces 1a facing forward, backward, left, and right. The steel column 1 is arranged with its longitudinal direction facing up and down. Multiple steel columns 1 are installed on a given floor of a building.

The slab 2 forms the floor beneath the steel column 1. The slab 2 is made of reinforced concrete. That is, the slab 2 is formed by pouring concrete 4 into a formwork (not shown) in which reinforcing bars 3 are arranged. The concrete 4 is poured so as to bury the bottom end of the steel column 1 (see Figure 2).

Next, the root wrapping structure 10 will be described in detail using Figures 1 to 5 and Figure 7.

The root wrapping structure 10 protects the steel column 1 by covering the side surface 1a at the bottom of the steel column 1. The root wrapping structure 10 is positioned above the slab 2. A root wrapping structure 10 is provided on each of the multiple steel columns 1. The root wrapping structure 10 mainly comprises a base material 20, a plate 30, a panel 40, and concrete 4.

The base material 20 shown in Figures 1 to 3, 5 and 7 is fixed to the side surface 1a at the bottom of the steel column 1, and a panel 40 (described below) is fixed to it. The base material 20 is a long metal member (lip channel steel) that is roughly C-shaped in cross section. The base material 20 is placed with its longitudinal direction facing up and down.

The base members 20 are fixed to the side surface 1a of the steel column 1 by welding. As shown in FIG. 1, the base members 20 are arranged two at a time on each side surface 1a (the side surface 1a that constitutes one side of the steel column 1 in a plan view), spaced apart horizontally (in the front-to-back or left-to-right direction). In other words, in this embodiment, a total of eight base members 20 are provided on the steel column 1. The base members 20 include a first base member 21 and a second base member 22.

The first base material 21 shown in Figures 1 and 3 is used to fix the connection portions (connection portions 42a and 43a) of the panel 40 described below. One first base material 21 is provided on each of a pair of side surfaces 1a (front and rear surfaces) of the steel column 1. Each first base material 21 is positioned point-symmetrically about the center of the steel column 1 in a plan view. More specifically, the first base material 21 is positioned on the right side of the side surface 1a facing rearward and the left side of the side surface 1a facing forward.

The second base material 22 is used to secure the panel 40 (described below) except for the connection portions (connection portions 42a and 43a). The second base material 22 is provided at the locations (eight locations) where base materials 20 are provided on the side surface 1a of the steel column 1, but where the first base material 21 is not provided. That is, one second base material 22 is provided on the left portion of the side surface 1a facing rearward and one on the right portion of the side surface 1a facing forward, with two second base materials 22 provided on each of the side surfaces 1a facing left and right. The protruding dimension (front-to-back dimension or left-to-right dimension) of the second base material 22 from the side surface 1a is larger than the protruding dimension (front-to-back dimension) of the first base material 21 from the side surface 1a.

The plate 30 shown in Figures 1, 2, 5, and 7 is where the panel 40 (described later) is placed. The plate 30 forms the bottom surface of the root wrapping. The plate 30 is formed in a plate shape with the plate surface facing up and down. The plate 30 is formed in a substantially quadrangular (approximately square) shape when viewed from above. The plate 30 has an opening 31.

The opening 31 is a portion that opens upward and downward in the center of the plate 30 when viewed from above. The opening 31 is formed in a shape (approximately square) that is roughly the same as the shape of the steel column 1 when viewed from above.

The plate 30 is fixed to the side surface 1a of the steel column 1 by welding, with the opening 31 inserted into the steel column 1. As shown in Figure 2, the plate 30 is positioned below the base material 20. The plate 30 is also positioned above the level of the slab 2 (so that a gap is formed between the plate 30 and the top surface of the slab 2).

The panel 40 shown in Figures 1 to 5 covers the entire periphery of the side surface 1a of the steel column 1. The panel 40 is formed by appropriately bending a metal plate. The panel 40 is placed on the plate 30 and fixed to the base material 20. The panel 40 is positioned so that a gap equal to the protruding dimension of the base material 20 is formed between the panel 40 and the side surface 1a of the steel column 1.

The panel 40 is formed in a roughly rectangular cylindrical shape that opens at the top and bottom. The outer shape of the panel 40 in a plan view is roughly the same as the outer shape of the plate 30 in a plan view (roughly square). The panel 40 is formed by combining a right panel 40A and a left panel 40B, which are multiple members divided horizontally (left and right).

The right panel 40A and the left panel 40B are formed identically to each other and are positioned point-symmetrically about the center of the steel column 1 in a plan view.

The following describes the right panel 40A. As shown in Figure 4, the right panel 40A is formed in a roughly C-shape in plan view. The right panel 40A includes a first portion 41, a second portion 42, and a third portion 43.

The first portion 41 shown in Figures 1 and 4 is a portion that covers the entirety of one side surface 1a (the side surface 1a facing to the right) of the steel column 1. The first portion 41 is arranged with its plate surface facing left and right. As shown in Figures 1 and 5, the first portion 41 is arranged so as to abut against a pair of second base members 22 provided on the side surface 1a facing to the right.

The second part 42 extends leftward from the rear end of the first part 41. The second part 42 covers a portion (right part) of the side surface 1a facing rearward of the steel column 1. The second part 42 is positioned with its plate surface facing in the front-to-rear direction. The second part 42 has a connecting part 42a.

The connection portion 42a is the portion that connects to the connection portion 43a of the left panel 40B, which will be described later. The connection portion 42a is formed at the leading end (left end) of the second portion 42 in the extension direction. The connection portion 42a includes a first extension portion 42b and a second extension portion 42c.

The first extension portion 42b extends forward from the left end of the second portion 42. The first extension portion 42b is positioned with its plate surface facing left and right.

The second extension portion 42c extends leftward from the front end of the first extension portion 42b. The second extension portion 42c is positioned with its plate surface facing the front-to-rear direction. As shown in Figures 1 and 5, the second extension portion 42c is positioned with a predetermined gap (a gap equivalent to the thickness of the second extension portion 43c, described below) from the first base material 21 provided on the rear-facing side surface 1a.

The third portion 43 extends leftward from the front end of the first portion 41. The third portion 43 covers a portion (right portion) of the forward-facing side surface 1a of the steel column 1. The third portion 43 is positioned with its plate surface facing the front-to-rear direction. The extension dimension of the third portion 43 is formed to be greater than the extension dimension of the second portion 42. As shown in Figures 1 and 5, the third portion 43 is positioned so as to abut against the first base material 21 and the second base material 22 provided on the forward-facing side surface 1a. The third portion 43 has a connecting portion 43a.

The connection portion 43a is the portion that connects to the connection portion 42a of the left panel 40B, which will be described later. The connection portion 43a is formed at the leading end (left end) of the third portion 43 in the extension direction. The connection portion 43a includes a first extension portion 43b and a second extension portion 43c.

The first extending portion 43b extends rearward from the left end of the third section 43. The first extending portion 43b is positioned with its plate surface facing left and right.

The second extending portion 43c extends leftward from the rear end of the first extending portion 43b. The second extending portion 43c is positioned with its plate surface facing the front-to-rear direction. As shown in Figures 1 and 5, the second extending portion 43c is positioned so as to abut against the first base material 21 provided on the side surface 1a facing forward.

As shown in Figures 1 and 5, the right-side panel 40A described above covers the right side of the steel column 1. The left-side panel 40B is generally similar to the right-side panel 40A, except that it is positioned point-symmetrically to the right-side panel 40A and covers the left side of the steel column 1. Therefore, a detailed description of the left-side panel 40B will be omitted.

The following describes how the panel 40 is attached to the base material 20 using Figures 1, 3, and 5.

First, as shown in Figures 1 and 5, the panels 40 (right panel 40A and left panel 40B) are placed on the plate 30 and positioned so that they abut against the respective base materials 20. In this embodiment, the panels 40 are divided in the left-right direction, so the right panel 40A and left panel 40B can be assembled by sandwiching the steel column 1 from the left and right. In this case, as shown in Figures 1 and 3, the second extension portion 42c of one of the right panel 40A and left panel 40B is positioned so that it overlaps the second extension portion 43c of the other in the front-to-rear direction. In this state, the lower opening of the panel 40 is blocked by the plate 30.

Next, as shown in Figures 3 and 5, the panel 40 is fixed to the base material 20 using appropriate fasteners such as screws. Specifically, the fasteners are passed through the outside of the panel 40 so that they reach the base material 20, thereby fixing each component.

As shown in FIG. 3, the second extension portion 42c of one of the right panel 40A and the left panel 40B and the second extension portion 43c of the other are fixed integrally to the first base material 21 by a common fastener while overlapping each other in the front-to-back direction. This connects the right panel 40A and the left panel 40B to each other.

In this embodiment, as shown in FIG. 3, the connecting portions (connection portions 42a and 43a) of the right and left panels 40A and 40B form a recess 40b in the side surface 40a of the panel 40. Furthermore, in this embodiment, the overlapping portion between the second extension portion 42c of one of the right and left panels 40A and 40B and the second extension portion 43c of the other is located inside the recess 40b. This positions the connecting portion between the right and left panels 40A and 40B (the overlapping portion between the second extension portion 42c and the second extension portion 43c) more inward (toward the center in a plan view) than the side surface 40a of the panel 40. Therefore, when an object moving on the slab 2 comes into contact with the panel 40, it is possible to prevent the second extension portion 42c and the second extension portion 43c from getting caught in the overlapping portion. Furthermore, the connecting portion between the right and left panels 40A and 40B can be made less noticeable.

As shown in Figure 1, the panel 40 fixed to the base material 20 as described above, the side surface 1a of the steel column 1, and the plate 30 define a space A that opens upward. The side surface 40a of the panel 40 is painted as appropriate and forms the finished surface for the root wrapping.

The concrete 4 shown in Figure 1 is to be filled (cast) into space A (see Figure 8). The concrete 4 has the same quality (mixture) as the concrete 4 in the slab 2.

Next, a method for constructing the above-described root-wrapping structure 10 (root-wrapping construction method) will be described using Figures 6 to 8. As shown in Figure 6, the root-wrapping construction method includes a base material fixing process (step S10), a plate fixing process (step S11), a panel fixing process (step S12), a concrete pouring process (step S13), and a painting process (step S14).

The base material fixing process (step S10) is a process of fixing the base material 20 to the side surface 1a of the steel column 1 by welding (see Figure 7). The base material fixing process is carried out, for example, at a designated factory before the steel column 1 is transported to the construction site.

The plate fixing process (step S11) is a process of fixing a plate 30 to the side surface 1a of the steel column 1 by welding (see Figure 7). The plate fixing process is carried out at a designated factory, just like the base material fixing process.

Figure 7 shows the steel column 1, to which the base material 20 and plate 30 are fixed, installed at the construction site. Note that in this state, the concrete 4 for the slab 2 has not yet been poured.

The panel fixing process (step S12) is a process of fixing the panel 40 to the base material 20. The panel fixing process is performed before the concrete 4 for the slab 2 is poured. In the panel fixing process, as described above, the panel 40 is placed on the plate 30, and then the panel 40 is fixed to the base material 20 using fasteners (see Figure 5).

After the panel fixing process is completed, the side surface 40a of the panel 40 is painted with an anti-rust coating. After painting, the side surface 40a of the panel 40 is protected (cured) with an appropriate film.

The concrete pouring process (step S13) shown in Figure 8 is a process of pouring concrete 4 into the space A defined by the side surface 1a of the steel column 1, the plate 30, and the panel 40. The concrete 4 is poured through the opening above the panel 40.

The concrete pouring process is carried out at least (or at the latest) before the concrete 4 in the slab 2 has hardened to the point where work on the slab 2 is possible (e.g., before the curing period for the concrete 4 has elapsed). In this embodiment, the concrete pouring process is carried out at the same time as the process of pouring the concrete 4 in the slab 2 (e.g., during a specified time period on the same day). More specifically, in this embodiment, the concrete 4 is poured into the space A before pouring the concrete 4 in the slab 2. Note that the concrete 4 may also be poured into the space A after pouring the concrete 4 in the slab 2.

In addition, in this embodiment, when pouring the concrete 4 for the slab 2, the concrete 4 is poured so that the top surface of the concrete 4 is positioned below the plate 30 (see Figure 2).

The painting process (step S14) is a process of applying a finishing coat to the side surface 40a of the panel 40 after the protective film has been removed. The painting process is carried out after the concrete 4 poured into space A (concrete 4 of slab 2) has hardened.

The root wrapping work is completed by performing the steps described above. According to the root wrapping work method of this embodiment, the panel fixing process is carried out before pouring the concrete 4 for the slab 2, creating a space A into which the concrete 4 is filled. This differs from a method in which the slab 2 is formed, the root wrapping reinforcement is arranged on the slab 2, and formwork is constructed on top of the slab 2, and then the concrete 4 is poured into the formwork. This allows concrete 4 to be poured into space A and root wrapping work to be performed without waiting for the slab 2 to be formed, thereby shortening the construction period.

Furthermore, with the root wrapping construction method according to this embodiment, the side surface 40a of the panel 40 becomes the finished surface of the root wrapping. Therefore, unlike when root wrapping is constructed using reinforced concrete, it is possible to eliminate the need to repair the surface of the concrete 4 after the concrete 4 has hardened and the formwork has been dismantled.

In this way, the root wrapping construction method according to this embodiment, unlike when using reinforced concrete to wrap roots, can reduce the construction work required by workers involved in multiple tasks such as assembling formwork, laying reinforcement, dismantling formwork, and repairing the surface of the concrete 4.

In addition, in the above-mentioned root-wrapped structure 10, two base members 20 are provided on each side 1a of the steel column 1. This allows the panel 40 to be fixed more effectively than when a single base member 20 is provided on each side 1a, and prevents the panel 40 from deforming due to the load imposed when concrete 4 is poured into space A.

In addition, the right panel 40A and the left panel 40B of the root wrapping structure 10 are formed to have the same shape. This ensures that the load exerted when concrete 4 is poured into space A is evenly distributed across the right panel 40A and the left panel 40B. This prevents excessive load from being applied to one of the right panel 40A and the left panel 40B, which could cause deformation of the panel 40.

In addition, the above-mentioned root wrapping structure 10 is arranged so that a gap is formed between the plate 30 and the slab 2. This allows clearance to be created between the slab 2 and the root wrapping in case the column (steel column 1) tilts, etc.

As described above, the root wrapping structure 10 according to the first embodiment of the present invention is
A base material 20 fixed to the side surface 1a of the column (steel column 1),
A panel 40 is fixed to the base material 20, covers the entire side surface 1a of the column (steel column 1) so that a gap is formed between the panel 40 and the side surface 1a of the column (steel column 1), and the side surface forms the finishing surface of the base wrapping of the column (steel column 1);
a bottom (plate 30) fixed to the column (steel column 1) so as to close the gap between the side surface 1a of the column and the panel 40 from below;
Concrete 4 is filled into a space A defined by the side surface 1a of the column (steel column 1), the panel 40, and the bottom (plate 30);
It is equipped with the following.

This configuration reduces the amount of work required for the root wrapping work. That is, the root wrapping work can be carried out by filling (pouring) concrete 4 into the space A within the panel 40, which serves as both the finishing surface for the root wrapping and the formwork. This allows the root wrapping work to be carried out without the need for work such as assembling the formwork, laying reinforcement, dismantling the formwork, or repairing the surface of the concrete 4, thereby reducing the amount of work required for the work.

Furthermore, the panel 40 is made of metal.

This configuration allows the panel 40 to be formed from a material suitable for both the finishing surface and formwork for the root wrapping. It also improves the strength of the root wrapping.

The base material 20 is fixed to the column (steel column 1) by welding.

This configuration allows the base material 20 to be firmly fixed to the pillar (steel pillar 1). This also prevents the panel 40 from being deformed by the load applied when concrete 4 is poured into space A.

The bottom (plate 30) is
It is installed so that a gap is formed between the slab 2 below the root wrapping.

This configuration allows clearance to be created between the slab 2 and the lining in case the column (steel column 1) tilts, etc.

The panel 40 is
It is composed of a plurality of divided members (right panel 40A and left panel 40B) divided in the horizontal direction,
The dividing member (right panel 40A) has connecting portions (connecting portions 42a and 43a) formed at its end to be connected to the other dividing member (left panel 40B),
The plurality of divided members (right panel 40A and left panel 40B) are
The connecting portions (connecting portions 42a and 43a) are overlapped with each other and fixed integrally to the base material 20.

This configuration makes it easy to attach the panel 40 to the column (steel column 1). Furthermore, by overlapping the connecting portions (connecting portions 42a and 43a) of the multiple divided members (right panel 40A and left panel 40B) and fixing them integrally with the base material 20, the individual members can be firmly fixed together.

The connection portions (connection portions 42a and 43a) form recesses 40b on the finished surface (side surface 1a) that are recessed toward the column (steel column 1).

With this configuration, the overlapping portions of the multiple dividing members (right panel 40A and left panel 40B) are located within the recess 40b. Therefore, when an object moving on the slab 2 comes into contact with the panel 40, it is possible to prevent the dividing members (right panel 40A and left panel 40B) from getting caught on the connecting portions (connecting portions 42a and 43a) between the dividing members. Furthermore, it is possible to make the connecting portions between the dividing members (right panel 40A and left panel 40B) less noticeable.

Also, a method for wrapping a column (steel column 1) to protect the column,
A base material fixing process (step S10) for fixing a base material 20 to the side surface 1a of the column (steel column 1);
A bottom fixing process (plate fixing process) (step S11) of fixing a bottom (plate 30) constituting the bottom surface of the root wrapping to the column (steel column 1);
Before pouring the concrete 4 of the slab 2 below the root wrapping, a panel 40 covering the entire side surface 1a of the column (steel column 1) is placed on the bottom (plate 30) and a panel fixing process (step S12) is performed to fix the panel 40 to the base material 20.
A concrete pouring process (step S13) of pouring concrete 4 into a space A partitioned by the side surface 1a of the column (steel column 1), the panel 40, and the bottom (plate 30);
It is equipped with the following.

This configuration reduces the labor required for root wrapping work. Specifically, root wrapping work can be performed by pouring concrete 4 into space A within the panel 40, which also serves as the finishing surface for the root wrapping and the formwork. This allows root wrapping work to be performed without the need for work such as assembling formwork, laying reinforcement, dismantling formwork, or repairing the surface of the concrete 4, thereby reducing the labor required for construction. Furthermore, the panel fixing process can be performed before pouring the concrete 4 for the slab 2, creating space A into which the concrete 4 will be filled. This differs from methods that require assembling formwork on the slab 2 after the slab 2 is formed, in that concrete 4 can be poured into space A and root wrapping work can be performed without waiting for the slab 2 to be formed, thereby shortening the construction period.

Furthermore, the concrete pouring process is carried out at the same time as pouring the concrete 4 for the slab 2.

This configuration allows for efficient construction of the slab 2 and root wrapping.

The steel column 1 in this embodiment is one form of a column according to the present invention.
The right panel 40A and the left panel 40B according to the present embodiment are one form of a dividing member according to the present invention. The connecting portion 42a and the connecting portion 43a according to the present embodiment are one form of a connecting portion according to the present invention.
The plate 30 in this embodiment is one form of the bottom part according to the present invention.
The plate fixing step in this embodiment is one form of the bottom fixing step according to the present invention.

The above describes the first embodiment of the present invention, but the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

For example, in this embodiment, the steel column 1 on which the root wrapping structure 10 is provided is a cylindrical steel pipe, but this is not limited to this. For example, as in the second embodiment shown in Figure 9, the root wrapping structure 10 may be provided on a steel column 1A that is an H-shaped steel beam.

The steel column 1A has a pair of flanges 5 with plate surfaces facing left and right, and a web 6 connecting the flanges 5 with plate surfaces facing forward and backward.

In the root wrapping structure 10 according to the second embodiment, two second base materials 22 are fixed to the outer surfaces (outer surfaces in the left-right direction) of both ends of the flange 5 in the front-to-rear direction.

In addition, in this embodiment, support members 50 for fixing other base materials 20 are fixed to the inner surfaces (inner surfaces in the left-right direction) of both ends of the flange 5 in the front-to-rear direction.

The support member 50 is a long metal member (angle bar) that is roughly L-shaped in cross section. The portion of the support member 50 with its plate surface facing left and right is fixed to the inner surface of the flange 5, and the portion with its plate surface facing forward and backward is fixed to the base material 20 (first base material 21 or second base material 22). The support members 50 are provided at the four corners of the steel column 1A in a plan view. The steel column 1A, support member 50, and base material 20 are fixed to each other by welding.

In addition, in this embodiment, the opening 31 in the plate 30 is formed in a shape (approximately H-shaped) that is generally similar to the shape of the steel column 1A in a plan view.

The root wrapping structure 10 according to the second embodiment as described above also achieves substantially the same effects as the root wrapping structure 10 according to the first embodiment.

In the above embodiments, two base materials 20 are provided on each side surface 1a of the steel column 1 (steel column 1A), but this is not limited to this. For example, three or more base materials 20 may be provided on each side surface 1a, or a single base material 20 may be provided on each side surface 1a.

In addition, while the above embodiments show examples in which the base material 20 is fixed to the steel column 1 and the support member 50 by welding, this is not limited to this configuration. For example, the base material 20 may be fixed to the steel column 1 and the support member 50 using fasteners such as bolts and nuts. The support member 50 may also be fixed to the steel column 1A using fasteners such as bolts and nuts.

In addition, in the above embodiments, examples have been shown in which the base material 20 and plate 30 are fixed to the steel column 1 at a factory in the base material fixing process and plate fixing process, but this is not limited to this form. For example, the base material 20 and plate 30 may be fixed to the steel column 1 at the construction site.

In addition, in each of the above embodiments, an example was shown in which the panel 40 was fixed to the base material 20 before the concrete 4 of the slab 2 was poured, but this is not limited to this form. For example, the panel 40 may be fixed to the base material 20 after the concrete 4 of the slab 2 has been poured.

In addition, in each of the above embodiments, the panel 40 is formed from two members, the right panel 40A and the left panel 40B, but this is not limited to this configuration. For example, the panel 40 may be formed from three or more members. Furthermore, the panel 40 may be formed from a single cylindrical member.

Furthermore, the shapes of the components (base material 20, plate 30, and panel 40) that make up the root wrapping structure 10 are not limited to those shown in the above embodiments. The shapes of the base material 20, plate 30, and panel 40 can be changed as appropriate depending on the shape of the steel column 1 (steel column 1A). For example, if the steel column 1 is a cylindrical column, the panel 40 may be formed in a cylindrical shape.

Furthermore, in each of the above embodiments, an example was shown in which the steel column 1 (steel column 1A) was used in a steel-framed building, but this is not limited to this. For example, the steel column 1 may also be used in a building with a concrete-filled steel pipe structure (CFT structure).

1 Steel column 10 Root wrapping structure 20 Base material 30 Plate 40 Panel

Claims (8)

A base material fixed to the side of the pillar,
A panel that is fixed to the base material, covers the entire side surface of the column so that a gap is formed between the side surface of the column, and the side surface constitutes the finishing surface of the column root wrapping;
a bottom portion fixed to the pillar so as to close the gap between the side surface of the pillar and the panel from below;
Concrete is filled into the space defined by the side of the column, the panel, and the bottom in a state separated from the concrete outside the space, including the concrete of the slab below the root wrapping ;
A root wrapping structure comprising: The base material, in plan view and cross-sectional view,
The panel is formed in a generally C-shape, and the generally C-shaped opening is provided between the panel and a side surface of the column.
The root wrapping structure according to claim 1. The panel is made of metal.
The root wrapping structure according to claim 1 or claim 2. The base material is fixed to the pillar by welding,
The pillar has a plurality of side surfaces,
On one of the plurality of side surfaces, two of the base materials are provided, the two base materials having different protrusion dimensions from the one side surface in a plan view.
The root wrapping structure according to any one of claims 1 to 3. The panel comprises:
It is composed of a plurality of divided members divided in the horizontal direction,
A connecting portion is formed at an end of the divided member to be connected to another divided member,
The plurality of divided members include:
The connecting portions are overlapped with each other and fixed integrally to the base material.
The root wrapping structure according to any one of claims 1 to 4. The connection portion is
A recess is formed on the finished surface that is recessed toward the column.
The root wrapping structure according to claim 5. A method for installing root wrapping to protect a pillar,
a base material fixing step of fixing a base material to the side surface of the pillar;
A bottom fixing step of fixing a bottom portion constituting a bottom surface of the root wrapping to the pillar;
A panel fixing process in which, before pouring concrete for the slab below the root wrapping, a panel covering the entire side surface of the column is placed on the bottom and the panel is fixed to the base material;
A concrete pouring process of pouring concrete into the interior of a space partitioned by the side surface of the column, the panel, and the bottom , in a state where the interior of the space is separated from the concrete outside the space, including the concrete of the slab;
A root wrapping construction method comprising: The concrete pouring step includes:
This is carried out at the same time as the concrete pouring of the slab.
The root wrapping method according to claim 7.