Methods for reinforcing concrete structures and reinforcing structures for concrete structures

Abstract

To reinforce concrete structures with easier work. [Solution] A method for reinforcing a concrete structure includes a space formation step of forming a space inside the concrete structure by removing at least a portion of the concrete constituent materials that make up the concrete of the concrete structure, and a placement step of placing a material that is fluid and has a higher strength when hardened than the concrete inside the space formed inside the concrete structure.

Description

Technical Field

[0001] The present invention relates to a method for reinforcing a concrete structure and a reinforcing structure for a concrete structure.

Background Art

[0002] Techniques for reinforcing existing concrete structures have been provided. For example, as a method for reinforcing a concrete column, a one-sided reinforcement method has been proposed in which a long hole is drilled in one side surface of the concrete column, and a metal anchor bolt or the like is driven into this long hole as a shear reinforcement material (see, for example, Patent Document 1). Further, for example, as a method for reinforcing a concrete column, a wire reinforcement method using a wire or the like as a shear reinforcement material has been proposed (see, for example, Patent Document 2).

[0003] For drilling holes in existing concrete structures such as this wire reinforcement method, a drill or a water jet type drilling device is used (see, for example, Patent Document 3). Further, as a method for reinforcing a concrete column, an inner spiral method has been proposed in which a spiral bar is arranged inside in addition to main bars which are axial reinforcement means (rebars) (see, for example, Patent Document 4).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, there is room for improvement in conventional methods of reinforcing concrete structures as described above. For example, it is difficult to apply the placement of spiral reinforcement inside existing concrete structures, as in the inward spiral reinforcement method mentioned above. Also, when inserting shear reinforcement materials such as anchor bolts or wires into drilled holes, as in the one-sided reinforcement method or wire reinforcement method mentioned above, the drilling diameter must be sized to match the bolt diameter, etc., in order to pass the shear reinforcement material through. If existing reinforcing bars get in the way, it may be necessary to drill multiple holes, which can complicate the reinforcement process. Thus, there is room for improvement in conventional methods of reinforcing existing concrete structures, and there is a desire for easier methods of reinforcing concrete structures.

[0006] The present invention aims to reinforce concrete structures with easier operation. [Means for solving the problem]

[0007] The method for reinforcing a concrete structure according to the present invention includes a space formation step of forming a space inside the concrete structure by removing at least a portion of the concrete constituent materials that make up the concrete of the concrete structure, and a placement step of placing a material that is fluid and has a higher strength when hardened than the concrete inside the space formed inside the concrete structure. [Effects of the Invention]

[0008] According to the present invention, concrete structures can be reinforced with easier work. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 shows a concrete column before the reinforcement method according to the embodiment is implemented. [Figure 2] Figure 2 shows the hole formation process of the reinforcement method according to the embodiment. [Figure 3] Figure 3 shows the space formation process of the reinforcement method according to the embodiment. [Figure 4] Figure 4 shows the arrangement process of the reinforcement method according to the embodiment. [Figure 5] Figure 5 shows a concrete column after the reinforcement method for the concrete structure according to the first modified example has been implemented. [Figure 6] Figure 6 shows a concrete column after the reinforcement method for the concrete structure according to the second modified example has been implemented. [Figure 7] Figure 7 shows a concrete column after the reinforcement method for the concrete structure according to the third modified example has been implemented. [Figure 8] Figure 8 shows a concrete column after the reinforcement method for the concrete structure according to the fourth modified example has been implemented. [Figure 9] Figure 9 shows another example of the hole formation process. [Figure 10] Figure 10 shows an example of another concrete structure to which the concrete reinforcement method can be applied. [Modes for carrying out the invention]

[0010] A method for reinforcing concrete structures according to one embodiment of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below.

[0011] [Methods for reinforcing concrete structures] In the following, we will explain an example of a concrete structure reinforcement method, using a concrete column 10, which is a column made of concrete, as an example of a concrete structure. In the following, we will show a rectangular concrete column 10, in which the cross-sectional shape intersecting the axial (longitudinal) direction is rectangular, as an example. However, the concrete column 10 is not limited to a rectangular column; it can be any prism such as a polygonal prism or triangular prism, or even a cylinder, as long as it is made of concrete.

[0012] In addition, if the following method for reinforcing a concrete structure is applicable, the concrete structure to which the reinforcement method is applied is not limited to a column, and may be any structure. For example, the concrete structure to which the reinforcement method is applied may be any structure such as a culvert structure, a slab (floor slab), a beam, etc. That is, the object to which the following method for reinforcing a concrete structure is applied can adopt any concrete structure as long as it is composed of concrete and can form a space for arranging the materials described later.

[0013] In the example shown below, a method for reinforcing a concrete structure is implemented for the concrete column 10 as shown in FIG. 1. FIG. 1 is a view showing the concrete column before the implementation of the reinforcement method according to the embodiment. (A) in FIG. 1 is a view of the concrete column 10 before the application of the method for reinforcing a concrete structure as seen from the side (a direction intersecting the axial direction). Further, (B) in FIG. 1 is a cross-sectional view showing the concrete column 10 before the application of the method for reinforcing a concrete structure. For example, (B) in FIG. 1 is a cross-sectional view (A-A cross-sectional view) at a position corresponding to A-A in (A) in FIG. 1.

[0014] The concrete column 10 in FIG. 1 is an existing reinforced concrete column, and a plurality of (16 in FIG. 1) vertical main reinforcing bars 11 (axial reinforcing bars) arranged at a predetermined interval are embedded. Hereinafter, in the concrete column 10, the region surrounded by the main reinforcing bars 11 in the cross-sectional view (the region indicated by the dashed line in FIG. 1) is referred to as the core concrete part 12. Although not shown in the figure, stirrups (shear reinforcement bars) may be arranged around the main reinforcing bars 11 which are axial reinforcing bars. For example, the stirrups are arranged at a predetermined interval along the axial direction of the concrete column 10. Therefore, when stirrups (shear reinforcement bars) are arranged, the position (drilling position) where the hole 20 described later is provided in the concrete column 10 is a position that does not overlap with the stirrups. In addition, the 1D (column cross-sectional height) section shown in FIG. 1 indicates the section from the lower end 13 of the concrete column 10 to the cross-sectional height D of the concrete column 10.

[0015] In addition, the concrete column 10 in Fig. 1 has a surface 14a (the front surface in (A) of Fig. 1), a surface 14b (the left surface in (A) of Fig. 1), a surface 14c (the rear surface (not shown) in (A) of Fig. 1), and a surface 14d (the right surface in (A) of Fig. 1). Hereinafter, when explaining without distinguishing the surfaces 14a, 14b, 14c, and 14d, they are collectively referred to as the surface 14. For example, the surface 14 is an outer surface that constitutes the side surface of the concrete column 10.

[0016] Hereinafter, the process flow of the reinforcement method for the concrete structure will be described using Figs. 2 to 4. In Figs. 2 to 4, the points necessary for explaining the method are mainly illustrated, and the illustration of the core concrete part 12 and the like illustrated in Fig. 1 is omitted. The order of explanation below shows an example of the order of operations (processes) for each step of the reinforcement method, and the order in which each step is performed is not limited to the order described below and may be performed in any order. That is, each step of the reinforcement method may be appropriately interchanged within the range where the step can be implemented. Also, among all the steps of the reinforcement method, when a plurality of steps can be performed in parallel, the plurality of steps may be performed in parallel.

[0017] First, the reinforcement method for the concrete structure includes steps as shown in Fig. 2. Fig. 2 is a diagram showing the hole forming step of the reinforcement method according to the embodiment. (A) in Fig. 2 is a view of the concrete column 10 to which the hole forming step of the reinforcement method for the concrete structure is applied, seen from the side (the direction intersecting the axial direction). Also, (B) in Fig. 2 is a cross-sectional view showing the concrete column 10 to which the hole forming step of the reinforcement method for the concrete structure is applied. For example, (B) in Fig. 2 is a cross-sectional view at the position corresponding to A-A in (A) of Fig. 1. The hole forming step shown in Fig. 2 is, for example, the first step of core drilling.

[0018] The hole-forming process creates holes in the direction from the surface of the concrete structure toward the interior of the concrete structure (also referred to as the "first direction"). In Figure 2, the hole-forming process creates six holes 20a, 20b, 20c, 20d, 20e, and 20f in the first direction from the surface 14a of the concrete column 10 toward the interior of the concrete column 10. Hereafter, when holes 20a, 20b, 20c, 20d, 20e, and 20f are not distinguished, they will be collectively referred to as holes 20. Note that Figure 2 shows an example where six holes 20 are formed by the hole-forming process, but the number of holes 20 is not limited to six; it may be five or fewer, or seven or more.

[0019] In Figure 2, the hole-forming process creates six elongated holes 20 in the concrete column 10, extending from the surface 14a into the interior of the concrete column 10. In Figure 2, the hole-forming process creates six holes 20 in the direction from the surface 14a to the surface 14c (first direction) of the concrete column 10. As a result, the hole-forming process creates holes 20 in the region of the concrete column 10 that includes the core concrete portion 12.

[0020] The hole formation process involves forming the hole 20 by any method. For example, the hole formation process involves forming the hole 20 by core drilling of the concrete. For example, the hole formation process involves forming the hole 20 by drilling. Note that the above are merely examples, and the hole formation process may involve forming the hole 20 by any method.

[0021] Furthermore, for example, the hole-forming process may involve forming a hole 20 extending from the surface 14 of the concrete column 10 into the interior using a water-jet drilling device, such as those disclosed in Patent Document 3. For example, the hole-forming process involves drilling a straight hole 20 to a predetermined depth inside the row of main reinforcing bars 11 using a high-pressure lance with a nozzle capable of ejecting high-pressure water forward. In Figure 2, the hole 20 is shown as an example of a non-penetrating hole (bottomed hole), but the hole 20 may also be a through-hole, for example, extending to the surface 14c side.

[0022] Next, the concrete structure reinforcement method includes the steps shown in Figure 3. Figure 3 is a diagram showing the space formation step of the reinforcement method according to the embodiment. (A) in Figure 3 is a view of the concrete column 10 to which the space formation step of the concrete structure reinforcement method has been applied, viewed from the side (in a direction intersecting the axial direction). Also, (B) in Figure 3 is a cross-sectional view showing the concrete column 10 to which the space formation step of the concrete structure reinforcement method has been applied. For example, (B) in Figure 3 is a cross-sectional view at the position corresponding to AA in (A) in Figure 1. The space formation step shown in Figure 3 is, for example, a second step of removing the mortar component from the concrete constituent material.

[0023] The space formation process creates a space inside a concrete structure by removing at least a portion of the concrete constituent materials that make up the concrete of the concrete structure. For example, the space formation process creates a space 30 inside a concrete column 10 by removing at least a portion of the concrete constituent materials that make up the concrete of the concrete column 10.

[0024] In Figure 3, the space formation process creates four partial spaces, each space 30b, that communicate with the holes 20c and 20d of the concrete column 10. For example, as shown in (B) in Figure 3, the space formation process creates four spaces 30b separated by concrete in the direction from surface 14a to surface 14c (the lateral direction of the concrete column 10).

[0025] Similar to space 30b, the space formation process creates four partial spaces 30a, each communicating with the holes 20a and 20b of the concrete column 10. For example, the space formation process creates four spaces 30a separated by concrete in the direction from surface 14a to surface 14c (the lateral direction of the concrete column 10). Also, similar to space 30b, the space formation process creates four partial spaces 30c, each communicating with the holes 20e and 20f of the concrete column 10. For example, the space formation process creates four spaces 30c separated by concrete in the direction from surface 14a to surface 14c (the lateral direction of the concrete column 10).

[0026] As shown in Figure 3, the space formation process creates spaces 30a, 30b, and 30c, which are partial spaces separated by concrete in the height direction of the concrete column 10. In the following explanation, spaces 30a, 30b, and 30c will be collectively referred to as space 30 without distinction. In Figure 3, the space formation process shows an example where 12 spaces 30 are formed, but the number of spaces 30 is not limited to 12; it may be 11 or fewer, or 13 or more.

[0027] Thus, the space formation process forms a space 30 inside the concrete column 10, which is a column body. The space formation process forms the space 30 by removing at least a portion of the concrete constituent material that makes up the concrete in a direction intersecting the first direction (also called the "second direction") from the hole 20.

[0028] In Figure 3, the space formation process creates a space 30 in the core concrete section 12, which is the area inside the main reinforcement bars 11 in the cross section intersecting the concrete column 10 in the height direction. The space formation process also creates a space 30 with a size of 0.5D or more in the height direction of the concrete column 10. In Figure 3, spaces 30a, 30b, and 30c are formed such that the sum of the height dimensions of spaces 30a, 30b, and 30c, which are aligned in the height direction of the concrete column 10, is 0.5D or more in the height direction of the concrete column 10.

[0029] The space formation process forms the space 30 by any method. For example, the space formation process forms the space 30 in a second direction toward the interior of the concrete column 10 from the hole 20 by a method using a water jet drilling device, such as that disclosed in Patent Document 3. For example, when forming the space 30 by a method using a water jet drilling device, the mortar is removed from the concrete, and the aggregate (gravel, etc.) that makes up the concrete together with the mortar remains in the space 30. In Figure 3, the aggregate remaining in the space 30 is shown by hatching in the area corresponding to the space 30.

[0030] The above is merely an example, and the space formation process may be carried out by any method. For example, the space formation process may be carried out by drilling holes using a drill. For example, the space formation process may be carried out by drilling small holes. Also, although Figure 3 shows an example where the space 30 is a hole that connects the holes 20 (a through hole), the space 30 may also be a non-through hole (a bottomed hole). In this case, one of the two holes 20 (for example, hole 20a and hole 20b) that connect the space 30 shown in Figure 3 may be omitted. Thus, the space 30 formed in the concrete column 10 may have only one part that communicates with the outside of the concrete column 10. In other words, the space 30 formed in the concrete column 10 does not have to have a pair of parts (inlet and outlet) that communicate with the outside of the concrete column 10.

[0031] Next, the concrete structure reinforcement method includes the steps shown in Figure 4. Figure 4 is a diagram showing the arrangement steps of the reinforcement method according to the embodiment. (A) in Figure 4 is a view of the concrete column 10 to which the arrangement steps of the concrete structure reinforcement method have been applied, viewed from the side (in a direction intersecting the axial direction). Also, (B) in Figure 4 is a cross-sectional view showing the concrete column 10 to which the arrangement steps of the concrete structure reinforcement method have been applied.

[0032] In other words, (A) in Figure 4 is a view of a concrete column 10 to which the concrete structure reinforcement method according to the embodiment is applied, viewed from the side (in a direction intersecting the axial direction). Thus, (A) in Figure 4 is a view of a concrete column 10 having the concrete structure reinforcement structure 100 according to the embodiment, viewed from the side (in a direction intersecting the axial direction).

[0033] Furthermore, (B) in Figure 4 is a cross-sectional view showing a concrete column 10 to which the concrete structure reinforcement method according to the embodiment is applied. Thus, (B) in Figure 4 is a cross-sectional view showing a concrete column 10 having the concrete structure reinforcement structure 100 according to the embodiment. For example, (B) in Figure 4 is a cross-sectional view at the position corresponding to AA in (A) in Figure 1. The arrangement step shown in Figure 4 is, for example, a third step of injecting resin into the space 30 and the hole 20.

[0034] The placement process involves placing a material that is fluid and has a strength higher than concrete when hardened into a space formed inside a concrete structure. For example, the placement process involves placing a resin material 40, which is fluid and has a strength higher than concrete when hardened, into a space 30 formed inside a concrete column 10. The placement process involves filling the space 30 with the resin material 40 in a fluid state and then hardening the resin material 40 to place it in the space 30. For example, the resin material 40 used is a resin material that hardens at room temperature.

[0035] Here, any resin material 40 can be used that has fluidity and a compressive strength higher than that of concrete when hardened. For example, the compressive strength of existing concrete is typically 27-30 N / m². 2 For example, the resin material 40 has a compressive strength of 30 N / m² when cured. 2A larger resin material is used. For example, the resin material 40 can be epoxy resin, acrylic resin, etc. The material placed in the space 30 is not limited to the resin material 40; any material that is fluid and has a higher strength when hardened than concrete may be used. For example, the material placed in the space 30 may be a high-strength grout such as cement-based non-shrink grout material.

[0036] The placement process involves placing the resin material 40 in the space 30 using any method. In Figure 4, the area where the resin material 40 is placed is indicated by (diagonal grid) hatching. That is, in Figure 4, the resin material 40 is also placed in the hole 20. For example, the placement process involves injecting the resin material 40 from the hole 20 to place the resin in the hole 20 and the space 30. In addition, solid materials such as aggregate may be added to supplement the strength of the resin material 40 placed in the hole 20 and the space 30. As a result, the method of reinforcing concrete structures can be improved by filling the holes 20 and the space 30 with a mixture of solid materials such as aggregate and resin material 40, thereby improving deformation performance.

[0037] As described above, if aggregate (gravel, etc.) remains in the space 30 after the space formation process, the placement process involves hardening the resin material 40 while it is mixed with the aggregate, thereby placing the resin material 40 in the space 30. In this way, the placement process may involve hardening the resin material 40 while it is mixed with the aggregate, which is the remaining concrete component other than the removed portion of the concrete components that make up the concrete, or the added solid material. This allows the concrete reinforcement method to fill the space 30 with a mixture of aggregate and resin material 40, thereby further improving the deformation performance.

[0038] [Reinforcement structures for concrete structures] The concrete column 10 shown in Figure 4 above represents the state of the concrete column 10 with the reinforcement structure 100 applied to it. As shown in Figure 4, the reinforcement structure of the concrete column 10 comprises holes 20, spaces 30, and a resin material 40. The holes 20 are formed extending inward from the surface 14 of the concrete column 10. The spaces 30 are formed inside the concrete column 10 by removing at least a portion of the concrete constituent material that makes up the concrete of the concrete column 10. The resin material 40 is fluid, has higher strength than concrete when hardened, and is placed in the spaces 30 formed inside the concrete column 10.

[0039] The concrete reinforcement method and concrete reinforcement structure 100 described above allow for the reinforcement of concrete structures such as concrete columns 10 with easier work. Furthermore, the concrete reinforcement method and concrete reinforcement structure 100 can improve deformation performance by forming a space 30 inside the concrete column 10 and placing a resin material 40, which has a higher strength than concrete when hardened, in the space 30.

[0040] [Variation] The embodiments described above are merely examples, and the method for reinforcing concrete structures is not limited to those described above and may take various forms. In this regard, several embodiments will be described below as modifications.

[0041] [First variation] First, the concrete structure reinforcement method and concrete structure reinforcement structure according to the first modified example will be explained using Figure 5. Figure 5 shows a concrete column after the concrete structure reinforcement method according to the first modified example has been implemented. In Figure 5, the concrete column after the concrete structure reinforcement method according to the first modified example has been implemented will be referred to as concrete column 10A, and the concrete structure reinforcement structure according to the first modified example will be referred to as concrete structure reinforcement structure 100A. Note that the same points as in the embodiments described above will be omitted from explanation as appropriate by using the same reference numerals.

[0042] Figure 5(A) is a lateral view (in a direction intersecting the axial direction) of a concrete column 10A to which the concrete structure reinforcement method according to the first modified example has been applied. Thus, Figure 5(A) is a lateral view (in a direction intersecting the axial direction) of a concrete column 10A having the concrete structure reinforcement structure 100A according to the first modified example.

[0043] Furthermore, (B) in Figure 5 is a cross-sectional view showing a concrete column 10A to which the concrete structure reinforcement method according to the first modified example is applied. Thus, (B) in Figure 5 is a cross-sectional view showing a concrete column 10A having the concrete structure reinforcement structure 100A according to the first modified example. For example, (B) in Figure 5 is a cross-sectional view at the position corresponding to AA in (A) in Figure 1.

[0044] The hole-forming step in the concrete structure reinforcement method according to the first modified example is the same as the hole-forming step in the concrete structure reinforcement method according to the embodiment, so a detailed explanation is omitted.

[0045] In the first modified example of the concrete structure reinforcement method, the space formation step forms a space 31 that communicates with the six holes 20a to f of the concrete column 10A. Thus, the space formation step in the first modified example forms one space 31 in the core concrete section 12.

[0046] In the first modified concrete structure reinforcement method, the placement step involves placing a resin material 40, which is fluid and has a higher strength than concrete when hardened, into a space 31 formed inside the concrete column 10A. Thus, the placement step in the first modified concrete structure involves filling the space 31 with the fluid resin material 40 and then hardening the resin material 40 to place it in the space 31. The space formation step and placement step in the first modified concrete structure may be performed by any step as long as it is possible to form the space 31 and place the resin material 41 in that space 31. For example, the space formation step and placement step in the first modified concrete structure may involve sequentially drilling holes to create a cross section that can support axial load, and then filling and placing the resin material into the space 31 formed by the drilling.

[0047] The concrete column 10A shown in Figure 5 above represents the state of the concrete column 10A with the reinforcement structure 100A attached to it. As shown in Figure 5, the reinforcement structure of the concrete column 10A comprises holes 20, spaces 31, and a resin material 40. The holes 20 are formed extending from the surface 14 of the concrete column 10A inward. The spaces 31 are formed inside the concrete column 10A by removing at least a portion of the concrete constituent material that makes up the concrete of the concrete column 10A. The resin material 40 is fluid, has higher strength than concrete when hardened, and is placed in the spaces 31 formed inside the concrete column 10A.

[0048] The concrete reinforcement method and concrete reinforcement structure 100A described above allow for easier reinforcement of concrete structures such as concrete columns 10A. Furthermore, the concrete reinforcement method and concrete reinforcement structure 100A can improve deformation performance by forming a space 31 inside the concrete column 10A and placing a resin material 40, which has a higher strength than concrete when hardened, in the space 31.

[0049] [Second variation] Next, the concrete structure reinforcement method and concrete structure reinforcement structure according to the second modified example will be described using Figure 6. Figure 6 shows a concrete column after the concrete structure reinforcement method according to the second modified example has been implemented. In Figure 6, the concrete column after the concrete structure reinforcement method according to the second modified example has been implemented will be referred to as concrete column 10B, and the concrete structure reinforcement structure according to the second modified example will be referred to as concrete structure reinforcement structure 100B. Note that the same points as those described above in the embodiments and modified examples will be omitted as appropriate by using the same reference numerals.

[0050] Figure 6(A) is a lateral view (in a direction intersecting the axial direction) of the concrete column 10B to which the concrete structure reinforcement method according to the second modified example has been applied. Thus, Figure 6(A) is a lateral view (in a direction intersecting the axial direction) of the concrete column 10B having the concrete structure reinforcement structure 100B according to the second modified example.

[0051] Furthermore, (B) in Figure 6 is a cross-sectional view showing a concrete column 10B to which the concrete structure reinforcement method according to the second modified example is applied. Thus, (B) in Figure 6 is a cross-sectional view showing a concrete column 10B having the concrete structure reinforcement structure 100B according to the second modified example. For example, (B) in Figure 6 is a cross-sectional view at the position corresponding to AA in (A) in Figure 1.

[0052] The hole-forming step in the concrete structure reinforcement method according to the second modified example is the same as the hole-forming step in the concrete structure reinforcement method according to the embodiment, so a detailed explanation is omitted.

[0053] In the second modified concrete structure reinforcement method, the space formation step creates a space 32 that communicates with the six holes 20a to f of the concrete column 10B. Thus, the space formation step in the second modified concrete structure creates one space 32 in the core concrete section 12. Furthermore, the space 32 in the second modified concrete structure differs from the space 31 in the first modified concrete structure in that, as shown in the cross-sectional view in (B) of Figure 6, concrete is left in the area enclosed by the space 32 in a plan view. As a result, the second modified concrete structure reinforcement method can suppress damage and collapse of the concrete in the core concrete section 12 by enclosing it with the space 32 in a plan view.

[0054] In the second modified example of the concrete structure reinforcement method, the placement step involves placing a resin material 40, which is fluid and has a higher strength than concrete when hardened, into a space 32 formed inside the concrete column 10B. Thus, in the placement step of the second modified example, the resin material 40 is placed into the space 32 by filling the space 32 with the resin material 40 in a fluid state and then hardening the resin material 40 after filling.

[0055] The concrete column 10B shown in Figure 6 above represents the state of the concrete column 10B with the reinforcement structure 100B applied to it. As shown in Figure 6, the reinforcement structure of the concrete column 10B comprises holes 20, spaces 32, and a resin material 40. The holes 20 are formed extending from the surface 14 of the concrete column 10B inward. The spaces 32 are formed inside the concrete column 10B by removing at least a portion of the concrete constituent material that makes up the concrete of the concrete column 10B. The resin material 40 is fluid, has higher strength than concrete when hardened, and is placed in the spaces 32 formed inside the concrete column 10B.

[0056] The concrete structure reinforcement method and concrete structure reinforcement structure 100B described above allow for the reinforcement of concrete structures such as concrete columns 10B with easier work. Furthermore, the concrete structure reinforcement method and concrete structure reinforcement structure 100B can improve deformation performance by forming a space 32 inside the concrete column 10B and placing a resin material 40, which has a higher strength than concrete when hardened, in the space 32.

[0057] [Third variation] Next, the concrete structure reinforcement method and concrete structure reinforcement structure according to the third modified example will be described using Figure 7. Figure 7 shows a concrete column after the concrete structure reinforcement method according to the third modified example has been implemented. In Figure 7, the concrete column after the concrete structure reinforcement method according to the third modified example has been implemented will be referred to as concrete column 10C, and the concrete structure reinforcement structure according to the third modified example will be referred to as concrete structure reinforcement structure 100C. Note that the same points as those described above in the embodiments and modified examples will be omitted as appropriate by using the same reference numerals.

[0058] Figure 7(A) is a lateral view (in a direction intersecting the axial direction) of a concrete column 10C to which the concrete structure reinforcement method according to the third modified example is applied. Thus, Figure 7(A) is a lateral view (in a direction intersecting the axial direction) of a concrete column 10C having the concrete structure reinforcement structure 100C according to the third modified example.

[0059] Furthermore, (B) in Figure 7 is a cross-sectional view showing a concrete column 10C to which the concrete structure reinforcement method according to the third modified example is applied. Thus, (B) in Figure 7 is a cross-sectional view showing a concrete column 10C having a concrete structure reinforcement structure 100C according to the third modified example. For example, (B) in Figure 7 is a cross-sectional view at the position corresponding to AA in (A) in Figure 1.

[0060] The hole-forming step in the concrete structure reinforcement method according to the third modified example is the same as the hole-forming step in the concrete structure reinforcement method according to the embodiment, so a detailed explanation is omitted.

[0061] The space formation step in the concrete structure reinforcement method according to the third modified example is the same as the space formation step in the concrete structure reinforcement method according to the embodiment, so a detailed explanation is omitted.

[0062] In the third modified concrete structure reinforcement method, the placement step involves placing a resin material 40, which is fluid and has a higher strength than concrete when hardened, into a space 30 formed inside the concrete column 10C. Thus, in the third modified concrete structure reinforcement method, the resin material 40 is placed into the space 30 by filling the space 30 with the fluid resin material 40 and then hardening the resin material 40 after filling. In addition, in the third modified concrete structure reinforcement method, reinforcing bars 50 are placed in the holes 20. The resin material 40 may be placed in the holes 20 together with the reinforcing bars 50, and the resin material 40 may be filled into the gap between the holes 20 and the reinforcing bars 50. The reinforcing bars 50 may also be provided in a part of the holes 20 as shown in Figure 8. In this way, the third modified concrete structure reinforcement method can improve the shear strength in the vertical direction (the direction in which the holes 20 extend) as shown in (B) of Figure 5 by placing reinforcing bars 50 in the holes 20. It should be noted that the shear strength can be improved not only by the reinforcing bars 50, but also by the resin material 40 placed in the space 30.

[0063] The concrete column 10C shown in Figure 7 above represents the state of the concrete column 10C with the reinforcement structure 100C applied to it. As shown in Figure 7, the reinforcement structure of the concrete column 10C comprises holes 20, spaces 30, a resin material 40, and reinforcing bars 50. The holes 20 are formed extending from the surface 14 of the concrete column 10C inward. The spaces 30 are formed inside the concrete column 10C by removing at least a portion of the concrete constituent material that makes up the concrete of the concrete column 10C. The resin material 40 is fluid, has higher strength than concrete when hardened, and is placed in the spaces 30 formed inside the concrete column 10C.

[0064] The concrete reinforcement method and concrete reinforcement structure 100C described above allow for easier reinforcement of concrete structures such as concrete columns 10C. Furthermore, the concrete reinforcement method and concrete reinforcement structure 100C can improve deformation performance by forming a space 30 inside the concrete column 10C and placing a resin material 40, which has a higher strength than concrete when hardened, in the space 30.

[0065] [Fourth variation] Next, the concrete structure reinforcement method and concrete structure reinforcement structure according to the fourth modified example will be described using Figure 8. Figure 8 shows a concrete column after the concrete structure reinforcement method according to the fourth modified example has been implemented. In Figure 8, the concrete column after the concrete structure reinforcement method according to the fourth modified example has been implemented will be referred to as concrete column 10D, and the concrete structure reinforcement structure according to the fourth modified example will be referred to as concrete structure reinforcement structure 100D. Note that the same points as those described above in the embodiments and modified examples will be omitted as appropriate by using the same reference numerals.

[0066] Figure 8(A) is a lateral view (in a direction intersecting the axial direction) of a concrete column 10D to which the concrete structure reinforcement method according to the fourth modified example has been applied. Thus, Figure 8(A) is a lateral view (in a direction intersecting the axial direction) of a concrete column 10D having the concrete structure reinforcement structure 100D according to the fourth modified example.

[0067] Furthermore, (B) in Figure 8 is a cross-sectional view showing a concrete column 10D to which the concrete structure reinforcement method according to the fourth modified example is applied. Thus, (B) in Figure 8 is a cross-sectional view showing a concrete column 10D having a concrete structure reinforcement structure 100D according to the fourth modified example. For example, (B) in Figure 8 is a cross-sectional view at the position corresponding to AA in (A) in Figure 1.

[0068] The hole-forming step in the concrete structure reinforcement method according to the fourth modification is the same as the hole-forming step in the concrete structure reinforcement method according to the embodiment, so a detailed explanation is omitted.

[0069] The space formation step in the concrete structure reinforcement method according to the fourth modified example is the same as the space formation step in the concrete structure reinforcement method according to the embodiment, so a detailed explanation is omitted.

[0070] The arrangement process in the concrete structure reinforcement method according to the fourth modified example is the same as the space formation process in the concrete structure reinforcement method according to the fourth modified example, so a detailed explanation is omitted.

[0071] The fourth modified example of a concrete structure reinforcement method includes a surface reinforcement step in which a steel plate 60, which is a reinforcing member for surface reinforcement, is placed on the surface 14 of the concrete column 10. In Figure 8, the surface reinforcement step involves attaching the steel plate 60 to the surface 14a of the concrete column 10. In Figure 8, as a result of the surface reinforcement step, the concrete column 10 has the steel plate 60 placed on its surface 14a. In this way, the fourth modified example of a concrete structure reinforcement method can improve the shear strength in the left-right direction (the direction intersecting the direction in which the hole 20 extends) in Figure 5 (B) by placing the steel plate 60 on the surface 14a of the concrete column 10. Thus, the concrete structure reinforcement method may also include bending reinforcement while improving shear strength by combining methods such as surface reinforcement.

[0072] The concrete column 10D shown in Figure 8 above represents the state of the concrete column 10D with the reinforcement structure 100D applied to it. As shown in Figure 8, the reinforcement structure of the concrete column 10D comprises a hole 20, a space 30, a resin material 40, reinforcing bars 50, and a steel plate 60. As shown in Figure 8, the reinforcing bars 50 do not necessarily extend the entire length of the hole 20, but may be only enough to secure the steel plate 60. Alternatively, the reinforcing bars 50 may be provided along the entire length of the hole 20, as shown in Figure 7. The hole 20 is formed so as to extend from the surface 14 of the concrete column 10D toward the interior. The space 30 is formed inside the concrete column 10D by removing at least a portion of the concrete constituent material that makes up the concrete of the concrete column 10D. The resin material 40 is fluid, has higher strength than concrete when hardened, and is placed in the space 30 formed inside the concrete column 10D.

[0073] The concrete reinforcement method and concrete reinforcement structure 100D described above allow for easier reinforcement of concrete structures such as concrete columns 10D. Furthermore, the concrete reinforcement method and concrete reinforcement structure 100D can improve deformation performance by forming a space 30 inside the concrete column 10D and placing a resin material 40, which has a higher strength than concrete when hardened, in the space 30.

[0074] [Other variations] It should be noted that the embodiments described above and the first to fourth modifications are merely examples of concrete reinforcement methods and reinforcement structures, and concrete reinforcement methods and reinforcement structures are not limited to those described above and may be applied to various concrete structures in various ways. Several examples of this point are described below.

[0075] For example, in the embodiments described above and the first to fourth modifications, the method for reinforcing a concrete structure was shown as an example of work from one side, but the method for reinforcing a concrete structure may include work from various sides.

[0076] For example, the hole-forming step of a concrete structure reinforcement method involves forming a first hole in a first region of the surface of the concrete structure that leads into the concrete structure, and forming a second hole in a second region of the surface of the concrete structure that faces in a different direction from the first region. For example, the hole-forming step of a concrete structure reinforcement method according to an embodiment involves forming a hole 20, which is a first hole that leads into the concrete column 10, in a first region of the surface 14 of the concrete column 10, and forming a hole 20, which is a second hole that leads into the concrete column 10, in a second region of the surface 14 of the concrete column 10 that faces in a different direction from the first region.

[0077] In this case, the hole-forming step of the concrete structure reinforcement method according to the embodiment may involve forming a first hole 20 that leads into the concrete column 10 on the surface 14a of the concrete column 10, and a second hole 20 that leads into the concrete column 10 on the surface 14b of the concrete column 10. Alternatively, the hole-forming step of the concrete structure reinforcement method according to the embodiment may involve forming a third hole 20 that leads into the concrete column 10 on the surface 14c of the concrete column 10, and a fourth hole 20 that leads into the concrete column 10 on the surface 14d of the concrete column 10. Thus, the holes 20 formed on the surface 14 of the concrete column 10 are not limited to one surface, but may be formed on multiple surfaces such as two, three, or four surfaces.

[0078] Furthermore, the holes 20 formed by the concrete structure reinforcement method may be used as spaces for placing materials that are fluid and have a higher strength than concrete when hardened. In other words, the holes 20 and the space 30 may be one and the same. In this case, for example, in the concrete structure reinforcement method, the hole formation step and the space formation step may be one and the same step. The concrete structure reinforcement method may also include only the space formation step and the placement step.

[0079] For example, in the embodiments described above and the first to fourth modifications, the case where there are two holes 20 arranged in a direction intersecting the axial (longitudinal) direction of the column (short-side direction) is shown as an example. However, the number of holes 20 arranged in a direction intersecting the axial (longitudinal) direction of the column (short-side direction) is not limited to two. An example of this point is shown in Figure 9 as the fifth modification.

[0080] Figure 9 shows another example of the hole formation process. In Figure 9, the concrete column after the concrete structure reinforcement method according to the fifth modified example is referred to as concrete column 10E, and the concrete structure reinforcement structure according to the fifth modified example is referred to as concrete structure reinforcement structure 100E. Note that the concrete structure reinforcement method and concrete structure reinforcement structure 100E according to the fifth modified example are the same as the concrete structure reinforcement method and concrete structure reinforcement structure 100 according to the embodiment, except that the number of holes 20 arranged in the direction intersecting the axial direction (longitudinal direction) of the column (short direction) is 3, so the explanation will be omitted as appropriate.

[0081] The hole-forming process creates holes in a first direction from the surface of the concrete structure toward the interior of the concrete structure. For example, the hole-forming process creates four rows of three holes 20 arranged in a direction (short direction) that intersects the axis (longitude) of the column, in the direction of the column's axis (longitude). As a result, in Figure 9, the hole-forming process creates 12 holes 20 in a first direction from the surface 14a of the concrete column 10E toward the interior of the concrete column 10E.

[0082] In Figure 9, the hole-forming process creates 12 elongated holes 20 in the concrete column 10E, extending from the surface 14a into the interior of the concrete column 10E. In Figure 9, the hole-forming process creates 12 holes 20 from the surface 14a of the concrete column 10E in a first direction. As a result, the hole-forming process creates holes 20 in the region of the concrete column 10E that includes the core concrete portion 12.

[0083] The concrete column 10E shown in Figure 9 above represents the state of the concrete column 10E with the reinforcement structure 100E attached to it. As shown in Figure 9, the reinforcement structure of the concrete column 10E comprises holes 20, spaces 30, and a resin material 40. The holes 20 are formed extending inward from the surface 14 of the concrete column 10E. The spaces 30 are formed inside the concrete column 10E by removing at least a portion of the concrete constituent material that makes up the concrete of the concrete column 10E. The resin material 40 is fluid, has higher strength than concrete when hardened, and is placed in the spaces 30 formed inside the concrete column 10E.

[0084] Furthermore, in the embodiments described above and the first to fifth modifications, the case where the cross-sectional shape intersecting the axial (longitudinal) direction of the column is square was shown as an example, but the cross-sectional shape intersecting the axial (longitudinal) direction of the column is not limited to a square. An example of this point is shown using Figure 10. Figure 10 is a diagram showing an example of another concrete structure to which the concrete structure reinforcement method can be applied. As shown in Figure 10, the concrete structure reinforcement method described above may also be applied to a concrete column 10F to which the cross-sectional shape intersecting the axial (longitudinal) direction is rectangular.

[0085] 〔effect〕 The concrete structure reinforcement method and reinforcement structure described above make it possible to reinforce concrete structures such as concrete columns 10 with easier work. The concrete structure reinforcement method described above is a reinforcement method that reinforces concrete structures and improves the deformation performance of concrete structures by removing the mortar from the core concrete section 12 in a 1D (column cross-sectional height) section from one side of the concrete column 10, etc., and filling the resulting void space 30 with resin.

[0086] Conventional reinforcement methods, as described above, primarily focus on reinforcing against shear failure of the column, and may not improve deformation performance in cases of bending failure. On the other hand, the concrete structure reinforcement method described above can improve deformation performance by creating a space inside the concrete structure and placing a material with higher hardening strength than concrete in that space.

[0087] For example, the above-described method for reinforcing concrete structures involves removing the mortar from the core concrete section 12 in the 1D (column cross-sectional height) section and filling the resulting void space 30 with resin. This reinforces only the 1D section, thereby improving deformation performance. Furthermore, the above-described method for reinforcing concrete structures eliminates the need to remove aggregate remaining in the space 30 or to pass wires through the space 30, making it easier to reinforce concrete structures compared to conventional reinforcement methods.

[0088] Although some embodiments of the present invention have been described above with reference to the drawings, these are illustrative examples, and the present invention may be implemented in various modified and improved forms based on the knowledge of those skilled in the art, starting with the embodiments described in the disclosure section of the invention. [Explanation of Symbols]

[0089] 10. Concrete columns (concrete structures) 11 Main reinforcing bars 12 Core concrete section 13 Lower end 14a, 14b, 14c, 14d surface 20a, 20b, 20c, 20d, 20e, 20f Holes 30a, 30b, 30c space 40 Resin materials 100 Reinforcement structures for concrete structures

Claims

1. A method for reinforcing concrete structures, A space formation step is to create a space inside the concrete structure by removing at least a portion of the concrete constituent materials that make up the concrete of the concrete structure, A placement step involves placing a material that is fluid and has a higher strength when hardened than the concrete into the space formed inside the concrete structure, A method for reinforcing concrete structures, including concrete structures.

2. A hole forming step of forming a hole in a first direction from the surface of the concrete structure toward the interior of the concrete structure, Includes, The aforementioned space formation step is, The space is formed by removing at least a portion of the concrete constituent material that makes up the concrete in the second direction intersecting the first direction from the hole. A method for reinforcing a concrete structure according to claim 1.

3. The hole forming step is, A first hole is formed in a first region of the surface of the concrete structure, extending into the concrete structure, and a second hole is formed in a second region of the surface of the concrete structure, facing in a different direction from the first region, extending into the concrete structure. The method for reinforcing a concrete structure according to claim 2.

4. A hole extending from the surface of the concrete structure into the concrete structure is formed as the space. A method for reinforcing a concrete structure according to claim 1.

5. The aforementioned placement step involves filling the space with the material in a fluid state and then hardening the material to place it in the space. A method for reinforcing a concrete structure according to claim 1.

6. The aforementioned placement step involves hardening the materials while they are mixed with the remaining concrete components other than the removed portion, or with the added solid aggregate, thereby placing the materials into the space. The method for reinforcing a concrete structure according to claim 5.

7. The space formation step involves forming a space that includes a plurality of partial spaces separated by the concrete in at least one of the height and lateral directions of the concrete structure. A method for reinforcing a concrete structure according to claim 1.

8. A surface reinforcement step of placing a reinforcing member on the surface of the concrete structure to reinforce the surface, A method for reinforcing a concrete structure according to claim 1, including the following:

9. The space formation step involves forming the space inside the column, which is a concrete structure. A method for reinforcing a concrete structure according to claim 1.

10. The space formation step involves forming the space in a region inside the main reinforcement in a cross-section that intersects the height direction of the column. A method for reinforcing a concrete structure according to claim 9.

11. The space formation step involves forming the space having a size of 0.5D or more in the height direction of the column. A method for reinforcing a concrete structure according to claim 9.

12. A reinforcing structure for concrete structures, By removing at least a portion of the concrete constituent materials that make up the concrete of the concrete structure, a space is formed inside the concrete structure, A material that is fluid, has a higher strength when hardened than the concrete, and is placed in the space formed inside the concrete structure, A reinforcing structure for concrete structures that includes the following features.

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