JP7537928B2 - Reinforcement structure for existing columns and method for reinforcing existing columns - Google Patents

Description

The technology disclosed in this specification relates to a reinforcement structure for an existing pillar and a method for reinforcing an existing pillar.

Conventionally, reinforcement structures for improving the earthquake resistance of existing columns (e.g., steel-framed columns) include reinforcement structures in which the existing columns are covered with reinforced concrete (e.g., Patent Document 1), and reinforcement structures in which reinforcing columns are joined to the periphery of existing columns (e.g., Patent Document 2).

JP 2007-327210 A JP 2017-48593 A

In the conventional reinforcement structure described above, the RC or reinforcing columns are installed around the existing column, so that the horizontal cross-sectional dimensions become larger than the horizontal cross-sectional dimensions of the existing column. Therefore, when realizing (constructing) this reinforcement structure, it is necessary to have sufficient space around the existing column to install the RC or reinforcing columns. However, there are cases where existing building components (e.g., piping) are placed around the existing column, and such sufficient space does not exist. In structures where such sufficient space does not exist, it is not possible to install the RC or reinforcing columns, and therefore this reinforcement structure cannot be applied.

This specification discloses a technology that can solve the above-mentioned problems.

The technology disclosed in this specification can be realized, for example, in the following forms:

(1) The reinforcing structure for an existing column disclosed in this specification comprises an existing column, at least one plate-like member, and a concrete member. In a horizontal cross section of the reinforcing structure, when a specific region is a virtual quadrangle region in which the four vertices of the quadrangle overlap the existing column, the existing column comprises at least one combination of a first portion and a second portion that define an inner region that is a part or the whole of the specific region, the first portion being a portion that overlaps a first vertex that is one of the four vertices, and the second portion being a portion that overlaps a second vertex that is the vertex adjacent to the first vertex and is separated from the first portion without passing through any part of the existing column other than the second portion. The at least one plate-like member contacts the first portion and the second portion, and closes the inner region together with the existing column, and the concrete member is filled in the inner region.

According to this reinforcement structure, the concrete member described above can improve the earthquake resistance of the existing column. As described above, the concrete member, which is a member that improves the earthquake resistance of the existing column, is filled in the inner area, which is a part or the whole of the specific area. In contrast, if a member (RC or reinforcing column) that improves the earthquake resistance of the existing column is installed around the existing column as in the conventional configuration, the member that improves the earthquake resistance of the existing column is installed only outside the inner area. Therefore, in this configuration, if an earthquake resistance equivalent to that of the present reinforcement structure is to be realized, the horizontal cross-sectional dimensions will be larger than the horizontal cross-sectional dimensions of the present reinforcement structure. As is clear from the above explanation, according to this reinforcement structure, the horizontal cross-sectional dimensions are suppressed from becoming larger compared to the conventional reinforcement structure in which RC or reinforcing columns are installed around the existing column. Therefore, this reinforcement structure can be applied even to a structure in which there is only a space smaller than the space required to install RC or reinforcing columns in the conventional reinforcement structure.

(2) In the above reinforcement structure, the existing column may have four of the combinations, and the reinforcement structure may have four of the plate-like members. With this reinforcement structure, the horizontal cross-sectional dimensions of the reinforcement structure are prevented from becoming large as described above, while the earthquake resistance of the existing column can be improved more effectively than a structure having less than four plate-like members.

(3) In the above reinforcement structure, the existing column may be a lattice column. When the existing column is a lattice column, the above-mentioned problem (the problem of the reinforcement structure being unable to be applied due to the large horizontal cross-sectional dimensions) is likely to occur. Therefore, the reinforcement structure configuration comprising the at least one plate-like member and the concrete member is particularly suitable for application to an existing column that is a lattice column.

(4) The method for reinforcing an existing column disclosed in this specification forms a reinforcing structure including an existing column, at least one plate-like member, and a concrete member. In a horizontal cross section of the reinforcing structure, when a specific region is a virtual quadrangle region in which four vertices of the quadrangle overlap the existing column, the existing column has at least one combination of a first portion and a second portion that define an inner region that is a part or the whole of the specific region, in which the first portion overlaps a first vertex that is one of the four vertices, and the second portion overlaps a second vertex that is the vertex adjacent to the first vertex, and is separated from the first portion without any part of the existing column other than the second portion. The reinforcing method includes an installation step of installing the at least one plate-like member so as to contact the first portion and the second portion and close the inner region together with the existing column, and a filling step of filling the inner region with the concrete member. Similar to the effects achieved by the reinforcement structure described above, this reinforcement method can also be applied to structures in which there is less space around the existing pillar than is required to install RC or reinforcement pillars as in the past.

The technology disclosed in this specification can be realized in various forms, for example, as a reinforcing structure for an existing pillar, a reinforcing method for an existing pillar, etc.

FIG. 1 is an explanatory diagram showing the configuration of a reinforcement structure 100 for an existing column 10 according to the present embodiment. FIG. 2 is an explanatory diagram showing a horizontal cross-sectional (XY cross-sectional) configuration of the reinforcement structure 100 taken along the line II-II in FIG. A flowchart showing the flow of the reinforcing method for an existing column 10 according to the present embodiment. FIG. 1 is an explanatory diagram showing an outline of a method for reinforcing an existing column 10 according to the present embodiment. FIG. 1 is an explanatory diagram showing a configuration of a reinforcement structure 100A according to a modified example. FIG. 13 is an explanatory diagram showing the configuration of a modified reinforcement structure 100B.

A. Embodiments:
A-1. Configuration of the reinforcement structure 100 for the existing column 10 of this embodiment:
In each figure, mutually orthogonal XYZ axes are shown to specify the direction. FIG. 1 is an explanatory diagram showing the configuration of a reinforcement structure 100 for an existing column 10 of this embodiment. The positive Z-axis direction is the upward direction, and the negative Z-axis direction is the downward direction. FIG. 1 shows the external configuration of the upper part of the reinforcement structure 100 as viewed in the horizontal direction (Y-axis direction) (the lower part is not shown). FIG. 2 is an explanatory diagram showing the horizontal cross-sectional (XY cross-sectional) configuration of the reinforcement structure 100 at the position II-II in FIG. 1.

The reinforcement structure 100 of this embodiment includes an existing column 10, and is a structure that has been reinforced by providing four plate-like members (31, ..., 34) and a concrete member 40 to improve the earthquake resistance of the existing column 10. The detailed configuration of the plate-like members (31, ..., 34) and the concrete member 40 will be described later.

As shown in Figures 1 and 2, the existing column 10 is a lattice column, and is equipped with four angle irons (angles) (first angle iron 11, ..., fourth angle iron 14) whose longitudinal direction is aligned in the vertical direction (Z-axis direction), and multiple flat steel bars (lattices) 20 sandwiched between each combination of two of these angle irons.

Below, we will explain the horizontal cross-sectional configuration of the four angle irons (first angle iron 11, ..., fourth angle iron 14) with reference to Figure 2.

The first angle iron 11 has a Y-axis extension portion 111 extending in the Y-axis direction, and an X-axis extension portion 112 extending in the X-axis negative direction from the Y-axis negative end of the Y-axis extension portion 111. Similarly, the second angle iron 12 has an X-axis extension portion 121 extending in the X-axis direction, and a Y-axis extension portion 122 extending in the Y-axis positive direction from the X-axis negative end of the X-axis extension portion 121. Similarly, the third angle iron 13 has a Y-axis extension portion 131 extending in the Y-axis direction, and an X-axis extension portion 132 extending in the X-axis positive direction from the Y-axis positive end of the Y-axis extension portion 131. Similarly, the fourth angle iron 14 has an X-axis extension portion 141 that extends in the X-axis direction, and a Y-axis extension portion 142 that extends in the Y-axis negative direction from the end of the X-axis extension portion 141 in the X-axis positive direction. As is clear from the above explanation, each angle iron is arranged so that the peak side of the mountain shape is located on the outside in the horizontal cross section of the reinforcement structure 100.

The four angle irons (first angle iron 11, ..., fourth angle iron 14) are arranged so that one angle iron overlaps each of the four vertices (V11, ..., V14) of a virtual rectangle (a virtual rectangle that defines a specific area SA1 described later) in the horizontal cross section of the reinforcement structure 100. Specifically, the first angle iron 11 overlaps the vertex V11, the second angle iron 12 overlaps the vertex V12, the third angle iron 13 overlaps the vertex V13, and the fourth angle iron 14 overlaps the vertex V14. In addition, vertex V11 is adjacent to vertices V14 and V12, vertex V12 is adjacent to vertices V11 and V13, vertex V13 is adjacent to vertices V12 and V14, and vertex V14 is adjacent to vertices V13 and V11. Here, "vertex B adjacent to vertex A" refers to a vertex that shares one side of the above quadrangle with vertex A (the same applies below).

The first angle iron 11 is separated from the fourth angle iron 14 without any part other than the first angle iron 11 of the existing column 10. The second angle iron 12 is separated from the first angle iron 11 without any part other than the second angle iron 12 of the existing column 10. The third angle iron 13 is separated from the second angle iron 12 without any part other than the third angle iron 13 of the existing column 10. The fourth angle iron 14 is separated from the third angle iron 13 without any part other than the fourth angle iron 14 of the existing column 10. Here, "part A is separated from part C without part B" means that part A is separated from part C without member B on the straight line connecting parts A and C (the same applies below). Therefore, the first angle steel 11 is separated from the fourth angle steel 14 on the straight line connecting the first angle steel 11 and the fourth angle steel 14 without passing through any part of the existing column 10 other than the first angle steel 11. In this configuration, the first angle steel 11 may be connected to the fourth angle steel 14 via a flat bar 20 as in this embodiment (the same applies to the second angle steel 12, ..., the fourth angle steel 14).

As is clear from the above explanation, the existing column 10 of this embodiment meets the following conditions:

In a combination consisting of a first angle iron 11 and a second angle iron 12 (hereinafter referred to as "combination C1"), the first angle iron 11 overlaps the apex V11, and the second angle iron 12 overlaps the apex V12 (the apex adjacent to the apex V11), and is separated from the first angle iron 11 without passing through any part of the existing column 10 other than the second angle iron 12. Note that in combination C1 consisting of the first angle iron 11 and the second angle iron 12, the first angle iron 11 corresponds to the first part in the claims, the second angle iron 12 corresponds to the second part in the claims, the apex V11 corresponds to the first apex in the claims, and the apex V12 corresponds to the second apex in the claims.

In a combination consisting of the second angle iron 12 and the third angle iron 13 (hereinafter referred to as "combination C2"), the second angle iron 12 overlaps the apex V12, and the third angle iron 13 overlaps the apex V13 (the apex adjacent to the apex V12), and is separated from the second angle iron 12 without passing through any part of the existing column 10 other than the third angle iron 13. In addition, in the combination C2 consisting of the second angle iron 12 and the third angle iron 13, the second angle iron 12 corresponds to the first part in the claims, the third angle iron 13 corresponds to the second part in the claims, the apex V12 corresponds to the first apex in the claims, and the apex V13 corresponds to the second apex in the claims.

In a combination consisting of the third angle iron 13 and the fourth angle iron 14 (hereinafter referred to as "combination C3"), the third angle iron 13 overlaps the apex V13, and the fourth angle iron 14 overlaps the apex V14 (the apex adjacent to the apex V13), and is separated from the third angle iron 13 without passing through any part of the existing column 10 other than the fourth angle iron 14. In addition, in the combination C3 consisting of the third angle iron 13 and the fourth angle iron 14, the third angle iron 13 corresponds to the first part in the claims, the fourth angle iron 14 corresponds to the second part in the claims, the apex V13 corresponds to the first apex in the claims, and the apex V14 corresponds to the second apex in the claims.

In a combination consisting of the fourth angle iron 14 and the first angle iron 11 (hereinafter referred to as "combination C4"), the fourth angle iron 14 overlaps the apex V14, and the first angle iron 11 overlaps the apex V11 (the apex adjacent to the apex V14), and is separated from the fourth angle iron 14 without passing through any part of the existing column 10 other than the first angle iron 11. Note that in combination C4 consisting of the fourth angle iron 14 and the first angle iron 11, the fourth angle iron 14 corresponds to the first part in the claims, the first angle iron 11 corresponds to the second part in the claims, the apex V14 corresponds to the first apex in the claims, and the apex V11 corresponds to the second apex in the claims.

Each flat bar 20 is a beam (lattice) and, as shown in FIG. 1, is arranged so that its longitudinal direction is inclined with respect to the horizontal direction (the X-axis direction in FIG. 1). The inclination direction of each flat bar 20 is opposite to the inclination direction of the adjacent flat bar 20 in the vertical direction (the Z-axis direction). Flat bar bolts 50 are provided at both ends of the longitudinal direction of each flat bar 20, and each flat bar 20 is joined to the two angle bars that sandwich the flat bar 20 by these two flat bar bolts 50.

A-2. Detailed configuration of the plate-like members (31, ..., 34) and the concrete member 40:
As shown in Figures 1 and 2, the plate-like members (31, ..., 34) are made of, for example, wood or steel, and function as part of a formwork when filling the inner area IA1 described later with a concrete member 40. The total length of each plate-like member (31, ..., 34) in the vertical direction (Z-axis direction) is approximately the same as the total length of the angle iron (first angle iron 11, ..., fourth angle iron 14) in the vertical direction. In addition, each plate-like member (31, ..., 34) has a dimension sufficient to close the inner area IA1, as described later. The concrete member 40 is a member for reinforcing the existing column 10.

The horizontal cross-sectional configuration of the plate-like members (31, ..., 34) and concrete member 40 will be described below with reference to FIG. 2. The plate-like members (31, ..., 34) and concrete member 40 have the configuration described below over almost the entire length in the vertical direction (Z-axis direction). The imaginary quadrangle (hereinafter referred to as "the quadrangle") shown in FIG. 2 is referred to as "specific area SA1". In this embodiment, the quadrangle is rectangular, and more specifically, a square (the same applies to the modified example shown in FIG. 5 and the modified example shown in FIG. 6). The specific area SA1 may have any configuration as long as it is configured as described below (the same applies to the specific areas (SA1, SA2) in the modified examples).

Each plate-shaped member (31, ..., 34) is positioned between two angle steels that contact it, and the plate thickness direction is perpendicular to the sides of the rectangle.

The plate-shaped member 31 is in contact with the first angle iron 11 and the second angle iron 12. More specifically, the plate-shaped member 31 is in contact with the end of the X-axis extension portion 112 of the first angle iron 11 in the negative X-axis direction and the end of the X-axis extension portion 121 of the second angle iron 12 in the positive X-axis direction.

Similarly, the plate-shaped member 32 is in contact with the second angle iron 12 and the third angle iron 13. More specifically, the plate-shaped member 32 is in contact with the Y-axis positive end of the Y-axis extension portion 122 of the second angle iron 12 and the Y-axis negative end of the Y-axis extension portion 131 of the third angle iron 13.

Similarly, the plate-shaped member 33 is in contact with the third angle iron 13 and the fourth angle iron 14. More specifically, the plate-shaped member 33 is in contact with the end of the X-axis extension portion 132 of the third angle iron 13 facing the positive X-axis direction and the end of the X-axis extension portion 141 of the fourth angle iron 14 facing the negative X-axis direction.

Similarly, the plate member 34 is in contact with the fourth angle iron 14 and the first angle iron 11. More specifically, the plate member 34 is in contact with the end of the Y-axis extension portion 142 of the fourth angle iron 14 facing in the negative direction of the Y-axis and the end of the Y-axis extension portion 111 of the first angle iron 11 facing in the positive direction of the Y-axis.

As shown in FIG. 1, each plate-shaped member (31, ..., 34) is joined to the flat steel 20 by two plate-shaped member bolts 60. An opening 310 is formed in the upper part of the plate-shaped member 31, which is one of the four plate-shaped members. The opening 310 is used when pouring the unhardened concrete 40A that forms the concrete member 40 into the inner area IA1. In this embodiment, as an example, the opening 310 is approximately circular when viewed in the Y-axis direction.

Each of the above-mentioned combinations of angle irons (C1, ..., C4) defines a portion of the outer periphery of an area (hereinafter referred to as "inner area IA1") that is part of specific area SA1. The four plate-shaped members (31, ..., 34) define the remaining portion of the outer periphery of inner area IA1. In other words, the entire outer periphery of inner area IA1 is defined by the four combinations C1, ..., C4 and the four plate-shaped members (31, ..., 34). In other words, inner area IA1 is closed by the combinations of angle irons C1 to C4 and the four plate-shaped members (31, ..., 34).

The concrete member 40 is filled in the inner area IA1.

A-3. Method for reinforcing existing column 10:
Fig. 3 is a flow chart showing the flow of the method for reinforcing an existing column 10 according to this embodiment. Fig. 4 is an explanatory diagram showing an outline of the method for reinforcing an existing column 10 according to this embodiment. First, the four plate-like members (31, ..., 34) described above are prepared (S10). At this time, as described above, for one of the four plate-like members, the plate-like member 31 having the opening 310 formed at the top is prepared.

Next, four plate-like members (31, ..., 34) are installed on the existing column 10 (S11). At this time, the four plate-like members (31, ..., 34) are installed so as to close the inner area IA1 as described above. Hereinafter, the step S11 will be referred to as the "installation step S11."

Column A of FIG. 4 shows the state before the installation of the plate-shaped members (31, ..., 34), and column B shows the state after the installation of the plate-shaped members (31, ..., 34). As shown in column B of FIG. 4, in the installation process S11, the plate-shaped member 31 is installed so as to contact the first angle iron 11 and the second angle iron 12 and close the inner area IA1 together with the existing column 10. In addition, the plate-shaped member 32 is installed so as to contact the second angle iron 12 and the third angle iron 13 and close the inner area IA1 together with the existing column 10. In addition, the plate-shaped member 33 is installed so as to contact the third angle iron 13 and the fourth angle iron 14 and close the inner area IA1 together with the existing column 10. In addition, a plate-shaped member 34 is installed so as to contact the fourth angle iron 14 and the first angle iron 11 and close the inner area IA1 together with the existing column 10. At this time, each plate-shaped member (31, ..., 34) is joined to the flat steel 20 by the plate-shaped member bolts 60 (two plate-shaped member bolts 60 in this embodiment) as described above. In addition, in order to prevent water leakage from the inner area IA1 to the outside, a sealant is filled to seal the inner area IA1.

Next, the inner area IA1 is filled with concrete members 40 (S12). Specifically, as shown in section C of FIG. 4, pre-hardened concrete 40A for forming the concrete member 40 is poured into the inner area IA1 from the opening 310 of the plate-shaped member 31, and then cured to harden the concrete 40A, thereby forming the concrete member 40 filled in the inner area IA1. The step S12 corresponds to the filling step in the claims. Through the above steps, the reinforcement structure 100 for the existing column 10 of this embodiment is realized (constructed).

A-4. Advantages of this embodiment:
As described above, the reinforcing structure 100 for an existing column 10 of this embodiment includes the existing column 10, four plate-like members (31, ..., 34), and a concrete member 40. In the horizontal cross section (XY cross section) of the reinforcing structure 100, the existing column 10 includes four combinations (C1, ..., C4) of a first portion and a second portion that define an inner area IA1 that is a part of a specific area SA1, in which the first portion overlaps a first vertex that is one of four vertices (V11, ..., V14), and the second portion overlaps a second vertex that is a vertex adjacent to the first vertex and is separated from the first portion without any part other than the second portion of the existing column 10. In this embodiment, the combinations consisting of the first and second parts are: combination C1 consisting of the first angle iron 11 (first part) and the second angle iron 12 (second part), combination C2 consisting of the second angle iron 12 (first part) and the third angle iron 13 (second part), combination C3 consisting of the third angle iron 13 (first part) and the fourth angle iron 14 (second part), and combination C4 consisting of the fourth angle iron 14 (first part) and the first angle iron 11 (second part). The specific area SA1 is a virtual quadrangle area in the horizontal cross section of the reinforcement structure 100, and is an area where the four vertices (V11, ..., V14) of the quadrangle overlap the existing column 10. The above-mentioned plate-like members (31, ..., 34) contact the first portion and the second portion, and close the inner area IA1 together with the existing column 10. The concrete member 40 is filled in the inner area IA1.

According to the reinforcement structure 100 of this embodiment, the above-mentioned concrete member 40 is provided, thereby improving the earthquake resistance of the existing column 10. As described above, the concrete member 40, which is a member for improving the earthquake resistance of the existing column 10, is filled in the inner area IA1, which is a part of the specific area SA1. In contrast, if a member (RC or reinforcing column) for improving the earthquake resistance of the existing column 10 is installed around the existing column 10 as in the conventional configuration, the member for improving the earthquake resistance of the existing column 10 is installed only outside the inner area IA1. Therefore, in this configuration, if an earthquake resistance equivalent to that of the reinforcement structure 100 of this embodiment is to be realized, the horizontal cross-sectional dimensions will be larger than the horizontal cross-sectional dimensions of the reinforcement structure 100 of this embodiment. As is clear from the above explanation, according to the reinforcement structure 100 of this embodiment, the horizontal cross-sectional dimensions are suppressed from becoming larger compared to the conventional reinforcement structure in which RC or reinforcing columns are installed around the existing column 10. Therefore, this reinforcement structure 100 can be applied to structures where there is only a smaller space than is required to install RC or reinforcement columns in conventional reinforcement structures.

The existing column 10 has four of the above combinations (C1, ..., C4). The reinforcing structure 100 for the existing column 10 has four plate-like members (31, ..., 34). Therefore, according to the reinforcing structure 100 for the existing column 10 of this embodiment, while preventing the horizontal cross-sectional dimensions of the reinforcing structure 100 from becoming large as described above, the earthquake resistance, etc. of the existing column 10 can be improved more effectively than a configuration with less than four plate-like members.

The existing column 10 is a lattice column. When the existing column 10 is a lattice column, the above-mentioned problem (the problem of being unable to apply a reinforcement structure due to the large horizontal cross-sectional dimensions) is likely to occur. Therefore, the reinforcement structure 100 configuration comprising the above-mentioned plate-like members (31, ..., 34) and the above-mentioned concrete member 40 is particularly suitable for application to the existing column 10, which is a lattice column, as in this embodiment.

B. Variations:
The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified in various forms without departing from the spirit of the invention. For example, the following modifications are also possible.

For example, in the above embodiment, the existing column 10 has four combinations (hereinafter referred to as "the above combinations") (C1, ..., C4) in which the first portion is a portion that overlaps with a first vertex, which is one of four vertices (V11, ..., V14), and the second portion is a portion that overlaps with a second vertex that is a vertex adjacent to the first vertex and is separated from the first portion without passing through any part other than the second portion of the existing column 10. However, the number of such combinations that the existing column 10 has may be one or more, and is not particularly limited. Therefore, a configuration including at least one plate-like member and a concrete member as in the above embodiment may be applied to an existing column having one to three, or five or more such combinations.

In the above embodiment (or modified example, the same applies below), the reinforcing structure 100 includes four plate-shaped members (31, ..., 34), but it may include only one to three of the four plate-shaped members (31, ..., 34). It may also include any number of plate-shaped members up to the number of combinations included in the existing column.

In the above embodiment, the existing column has at least one combination of a first part and a second part that define an inner region (a region filled with concrete material), the first part overlaps a first vertex that is one of four vertices, and the second part overlaps a second vertex that is an vertex adjacent to the first vertex, and is separated from the first part without any part other than the second part of the existing column 10. And, as long as the conditions that "the plate-like member contacts the first part and the second part, and closes the inner region together with the existing column" are satisfied, the configurations (shape, material, etc.) of the existing column, the plate-like member, and other members such as flat steel are not limited to those described above.

Figure 5 is an explanatory diagram showing the configuration of a modified reinforcement structure 100A. Figure 5 shows the configuration of a horizontal cross section (XY cross section) of a modified reinforcement structure 100A. For example, in the above embodiment, as shown in Figure 5, the plate-shaped members (31A, ..., 34A) may be positioned outside the two angle irons contacting the plate-shaped members, rather than between the two angle irons contacting the plate-shaped members, and the plate thickness direction may be perpendicular to the sides of the rectangle. In the modified example of FIG. 5, in the horizontal cross section of the reinforcing structure 100A (for example, the cross section shown in FIG. 5), the existing column 10 has four combinations (C1, ..., C4) of a first portion and a second portion that define an inner area IA2 that is part of the specific area SA1, where the first portion overlaps a first vertex that is one of four vertices (V11, ..., V14), and the second portion overlaps a second vertex that is adjacent to the first vertex and is separated from the first portion without passing through any part of the existing column 10 other than the second portion.

The plate-like members (31, ..., 34) described above are in contact with the first and second parts and, together with the existing column 10, close the inner area IA2. The concrete member 41 is filled in the inner area IA2.

The modified example in FIG. 5 also has the same effect as the above embodiment (it can be applied to a structure in which there is only a space around the existing column 10 that is smaller than the space required to install an RC or reinforcing column as in the conventional case). In this case, the plate-shaped members (31, ..., 34) are preferably joined by bolts or the like to two angle steels (first angle steel 11, ..., fourth angle steel 14) that contact the plate-shaped members (31, ..., 34), rather than to the flat steel 20 as in the above embodiment.

In addition, instead of the existing column 10 being a lattice column as in the above embodiment, the reinforcing structure configuration comprising the above plate-like member and the above concrete member may be applied to an existing column of a type other than a lattice column.

Figure 6 is an explanatory diagram showing the configuration of a modified reinforcement structure 100B. Figure 6 shows the configuration of a horizontal cross section (XY cross section) of the modified reinforcement structure 100B. For example, as shown in Figure 6, the configuration of reinforcement structure 100B including plate members (31B, 32B) and concrete members (40B, 41B) may be applied to an existing column 10B made of H-shaped steel. The longitudinal direction of existing column 10B (H-shaped steel) is along the vertical direction (Z-axis direction).

The horizontal cross-sectional configuration of the modified reinforcement structure 100B will be described with reference to Figure 6.

The existing column 10B has a first Y-axis extension portion 11B extending in the Y-axis direction, a second Y-axis extension portion 12B located on the negative X-axis side of the first Y-axis extension portion 11B and extending in the Y-axis direction, and an X-axis extension portion 13B connected to the first Y-axis extension portion 11B and the second Y-axis extension portion 12B and extending in the X-axis direction. The four vertices (V21, ..., V24) of the rectangle of the specific area SA2, which is a virtual rectangular area shown in Figure 6, overlap with the existing column 10B.

In a combination consisting of a portion 111B on the negative Y-axis side of the first Y-axis extension portion 11B and a portion 121B on the negative Y-axis side of the second Y-axis extension portion 12B (hereinafter referred to as "combination C11"), the portion 111B on the negative Y-axis side of the first Y-axis extension portion 11B overlaps with vertex V21, and the portion 121B on the negative Y-axis side of the second Y-axis extension portion 12B overlaps with vertex V22 (the vertex adjacent to vertex V21) and is separated from the portion 111B on the negative Y-axis side of the first Y-axis extension portion 11B without passing through any part other than the portion 121B on the negative Y-axis side of the second Y-axis extension portion 12B of the existing column 10B. In addition, the plate-like member 31B is in contact with the portion 111B on the negative Y-axis side of the first Y-axis extension portion 11B and the portion 121B on the negative Y-axis side of the second Y-axis extension portion 12B. In the combination C1 consisting of the first angle iron 11 and the second angle iron 12, the portion 111B on the negative Y-axis side of the first Y-axis extension portion 11B corresponds to the first portion in the claims, the portion 121B on the negative Y-axis side of the second Y-axis extension portion 12B corresponds to the second portion in the claims, the vertex V21 corresponds to the first vertex in the claims, and the vertex V22 corresponds to the second vertex in the claims.

In the modified example of FIG. 6, in a horizontal cross section (e.g., the cross section shown in FIG. 6) of the reinforcing structure 100B, the existing column 10B has four combinations (C11, ..., C14) of a first portion and a second portion that define the inner area IA3 and the inner area IA4 that are part of the specific area SA2, where the first portion overlaps with a first vertex that is one of four vertices (V21, ..., V24), and the second portion overlaps with a second vertex that is an adjacent vertex to the first vertex and is separated from the first portion without passing through any part other than the second portion of the existing column 10.

The plate-like members (31B, 32B) described above are in contact with the first and second parts, and together with the existing column 10B, close the inner areas IA3 and IA4, which are part of the specific area SA2. The concrete members 40 are filled in the inner areas IA3 and IA4.

The modified example in FIG. 6 also provides the same effect as the above embodiment (it can also be applied to a structure in which there is only a smaller space around the existing column 10B than is required to install an RC or reinforcing column as in the conventional case).

In the above embodiment, the virtual quadrangle defining the specific area (SA1, ..., SA4) may be a quadrangle other than a rectangle (e.g., a parallelogram, a trapezoid).

In addition, in the above embodiment, the inner areas (IA1, ..., IA4) are part of the specific area SA1, but may be the entire specific area (SA1, SA2).

The structure for joining the members constituting the reinforcing structure described above is not limited to the structure described above. In the above embodiment, the members are joined with bolts, but the members may be joined by welding, for example.

In addition, in the first embodiment and the like, flat steel may be used instead of the angle steel (first angle steel 11, ..., fourth angle steel 14).

10, 10B: Existing column 11: First angle iron 11B: First Y-axis extension portion 12: Second angle iron 12B: Second Y-axis extension portion 13: Third angle iron 13B: X-axis extension portion 14: Fourth angle iron 20: Flat iron 31-34, 31B, 32B: Plate-shaped member 40, 41: Concrete member 40A: Concrete before hardening 50: Bolt for flat iron 60: Bolt for plate-shaped member 100, 100A, 100B: Reinforcing structure 111: Y-axis extension portion of first angle iron 111B: Part of first Y-axis extension portion on the negative Y-axis side 112: X-axis extension portion of first angle iron 121: X-axis extension portion of second angle iron 121B: Part of the second Y-axis extension part on the negative Y-axis side 122: Y-axis extension part of the second angle iron 131: Y-axis extension part of the third angle iron 132: X-axis extension part of the third angle iron 141: X-axis extension part of the fourth angle iron 142: Y-axis extension part of the fourth angle iron 310: Opening C1-C4, C11-C14: Combination of the first part and the second part IA1-IA4: Inner area SA1, SA2: Specific area V11-V14, V21-V24: Vertices of the rectangle of the specific area

Claims (4)

A reinforcement structure for an existing pillar,
An existing column that is a lattice column having a lattice material ;
At least one plate-like member;
Concrete members;
Equipped with
In a horizontal cross section of the reinforcing structure,
When a specific area is a virtual quadrilateral area, and the four vertices of the quadrilateral overlap with the existing pillar,
the existing pillar includes at least one combination of a first portion and a second portion that define an inner region that is a part or the whole of the specific region, the first portion being a portion that overlaps a first vertex that is one of the four vertices, and the second portion being a portion that overlaps a second vertex that is the vertex adjacent to the first vertex and is separated from the first portion without passing through a portion of the existing pillar other than the second portion;
The at least one plate-like member is
a first portion and a second portion in contact with the first portion and, together with the existing pillar, closes the inner region;
The concrete member is filled in the inner region ,
The at least one plate-like member is arranged at a position overlapping the lattice material when viewed in the horizontal direction .
Reinforcement structure for existing pillars. The reinforcing structure for an existing column according to claim 1,
The existing column has four of the combinations,
The reinforcing structure includes four of the plate-like members.
Reinforcement structure for existing pillars. The reinforcement structure for an existing column according to claim 1 or 2,
The at least one plate-like member is arranged so as to overlap with the outline of the specific region.
Reinforcement structure for existing pillars. A method for reinforcing an existing column, which forms a reinforcement structure including an existing column that is a lattice column having a lattice material , at least one plate-like member, and a concrete member,
In a horizontal cross section of the reinforcing structure,
When a specific area is a virtual quadrilateral area, and the four vertices of the quadrilateral overlap with the existing pillar,
the existing pillar includes at least one combination of a first portion and a second portion that define an inner region that is a part or the whole of the specific region, the first portion being a portion that overlaps a first vertex that is one of the four vertices, and the second portion being a portion that overlaps a second vertex that is the vertex adjacent to the first vertex and is separated from the first portion without passing through a portion of the existing pillar other than the second portion;
The reinforcing method includes:
An installation process of installing the at least one plate-like member so as to contact the first portion and the second portion and close the inner area together with the existing column, the at least one plate-like member being installed in a position overlapping the lattice material when viewed in a horizontal direction;
a filling step of filling the inner region with the concrete member;
Equipped with
How to reinforce existing columns.

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