Pillar reinforcement structure and pillar reinforcement method

Abstract

To reinforce a weak axial direction of columns without using braces.SOLUTION: A reinforcement structure of a column 20 comprises: a column 20 comprising H steel 22, concrete 24 filled between flanges 22F of the H steel 22, and column main bars 26 embedded in the concrete 24; a base plate 28 joined to a bottom end of the H steel 22 and fixed to a support (foundation structure 40); anchor bolts 32 with bottom ends embedded in the support and top ends protruding through through-holes formed in the base plate 28 and aligned with the column main bars 26 and the H steel 22 in a weak axis direction; and reinforcing concrete 34, which is integral with the concrete 24 and buries the anchor bolts 32.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a pillar reinforcement structure and a pillar reinforcement method. [Background technology]

[0002] Patent Document 1 listed below shows a fixing structure for a reinforcing member in which the reinforcing member is arranged in the direction of the weak axis of a column formed of H-shaped steel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-143515 Summary of the Invention [Problem to be solved by the invention]

[0004] In the fixing structure of the reinforcing member in Patent Document 1, the reinforcing member arranged in the weak axis direction of the column formed of H-shaped steel functions as a knee brace or brace for the structure. This reinforces the structure consisting of columns and beams. However, there is a demand for a structure that does not require the use of braces, such as when it is desired to form an opening in a structural surface surrounded by columns and beams.

[0005] In consideration of the above, the present invention aims to reinforce a column in the weak axis direction without using a brace. [Means for solving the problem]

[0006] The column reinforcement structure of claim 1 comprises a column having an H-shaped steel, concrete filled between flanges of the H-shaped steel, and column main reinforcement embedded in the concrete; a base plate joined to the lower end of the H-shaped steel and fixed to a support; and a base plate having a lower end embedded in the support and an upper end protruding from a through-hole formed in the base plate and , along the main column reinforcement, andThe structure includes anchor bolts arranged in the weak axis direction of the column main reinforcement and the H-shaped steel, and reinforced concrete that is integrated with the concrete and embeds the anchor bolts.

[0007] In the column reinforcement structure of claim 1, the upper end of the anchor bolt is arranged alongside the column main reinforcement, forming a lap joint. Furthermore, the anchor bolt and the column main reinforcement are arranged alongside the weak axis direction of the H-shaped steel, reinforcing the weak axis direction. This allows the column to be reinforced in the weak axis direction without using a brace.

[0008] A column reinforcement structure according to claim 2 is the column reinforcement structure according to claim 1, wherein the column main reinforcement and the anchor bolt are formed as a gap lap joint.

[0009] In the column reinforcement structure of claim 2, the column main reinforcement and the anchor bolt are connected with a gap lap joint. With a gap lap joint, there is no need for the column main reinforcement and the anchor bolt to come into contact, making erection adjustments easier. The column reinforcement structure of claim 3 is the column reinforcement structure of claim 1, wherein the reinforcing concrete is arranged outside the concrete in the weak axis direction, is not arranged over the entire length of the column, and is at a height that ensures a predetermined cover thickness upward from the upper end face of the anchor bolt.

[0010] Claim 4 The method for reinforcing a column includes the steps of: placing column main reinforcements between flanges of H-shaped steel; pouring concrete between the flanges; forming a column in which the column main reinforcements protrude downward from the concrete; inserting the upper end of an anchor bolt, the lower end of which is embedded in a support, into a through-hole formed in a base plate of the column; and attaching the column main reinforcements and the anchor bolt to the Along with each other, The method includes a step of arranging the reinforcement bars in the weak axis direction of the H-shaped steel, and a step of pouring post-cast concrete around the main column reinforcement bars and the anchor bolts to embed the main column reinforcement bars and the anchor bolts in the post-cast concrete.

[0011] Claim 4In this column reinforcement method, the upper end of the anchor bolt is arranged alongside the main column reinforcement, forming a lap joint. The anchor bolt and the main column reinforcement are also arranged alongside the weak axis of the H-section steel, reinforcing the weak axis. This allows the column to be reinforced in the weak axis direction without using a brace. [Effects of the Invention]

[0012] According to the present invention, it is possible to reinforce a column in the weak axis direction without using a brace. [Brief explanation of the drawings]

[0013] [Figure 1] 1A is a vertical cross-sectional view showing a reinforcement structure for a column according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line BB of FIG. 1A. [Figure 2] FIG. 1(A) is a cross-sectional elevation view showing the state before an anchor bolt is inserted into a base plate joined to a column according to an embodiment of the present invention, FIG. 1(B) is a cross-sectional elevation view showing the state after the anchor bolt has been inserted into the base plate, and FIG. 1(C) is a cross-sectional elevation view showing the state in which concrete is being poured to cover the column main reinforcement and the anchor bolt. [Figure 3] 1A is a vertical cross-sectional view showing a modified example in which the position of the anchor bolt is different in the column reinforcement structure according to the embodiment of the present invention, and FIG. 1B is a cross-sectional view along line BB of FIG. 1A. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a column reinforcement structure and a column reinforcement method according to an embodiment of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiple numbers.

[0015] Furthermore, descriptions of overlapping configurations and symbols in each drawing may be omitted. Note that the present disclosure is not limited to the following embodiments, and may be implemented by making appropriate modifications, such as omitting configurations or replacing them with different configurations, within the scope of the purpose of the present disclosure.

[0016] In each drawing, the directions indicated by arrows X and Y are directions along the horizontal plane and are perpendicular to each other. The direction indicated by arrow Z is a direction along the vertical direction (up and down). In each drawing, the directions indicated by arrows X, Y, and Z are assumed to be consistent with each other.

[0017] <Column reinforcement structure> 1 shows a pillar reinforcing structure according to an embodiment of the present invention. This pillar reinforcing structure includes a pillar 20 and a reinforcing member 30 for reinforcing the pillar 20.

[0018] (pillar) The column 20 is configured to include an H-shaped steel 22, concrete 24 filled between flanges 22F of the H-shaped steel 22, and column main reinforcement 26 embedded in the concrete 24.

[0019] The H-shaped steel 22 is a steel material in which flanges 22F extending along the X-direction are joined to both ends of a web 22W extending along the Y-direction. The Y-direction is also referred to as the strong axis direction of the H-shaped steel 22, and the X-direction is also referred to as the weak axis direction of the H-shaped steel 22.

[0020] As shown in Fig. 1(B), the concrete 24 is filled in a position sandwiched between the flanges 22F of the H-shaped steel 22 in plan view. In addition, as shown in Fig. 1(A), the concrete 24 is arranged over the entire length of the H-shaped steel 22 in the longitudinal direction.

[0021] Furthermore, reinforced concrete 34 is placed on the outer side of the concrete 24 in the X direction (on the opposite side of the web 22W as viewed from the concrete 24) and is poured integrally with the concrete 24. In this specification, the concrete formed by integrating the concrete 24 and the reinforced concrete 34 is referred to as concrete C.

[0022] As shown in Fig. 1(A), the column main reinforcements 26 are reinforcing bars arranged over substantially the entire length of the column 20, extending from the upper end of the H-shaped steel 22 to the vicinity of the base plate 28. As shown in Fig. 1(B), the column main reinforcements 26 are arranged on both sides of the web 22W of the H-shaped steel 22. Furthermore, a plurality of the column main reinforcements 26 (two in this embodiment) are arranged side by side in the Y direction at positions sandwiched between both flanges 22F on each side of the web 22W.

[0023] (base plate) A base plate 28 is joined to the lower end of the H-shaped steel 22. The dimensions of the base plate 28 in the X direction and the Y direction are larger than the dimensions of the H-shaped steel 22.

[0024] The base plate 28 has through holes (not shown) formed therein for inserting the anchor bolts B1 and 32. As shown in FIG. 1(A), the base plate 28 is fixed to a foundation structure 40 serving as a support body using a plurality of anchor bolts B1.

[0025] The anchor bolts B1 are connecting members whose lower ends are embedded in the foundation structure 40 and whose upper ends protrude from the foundation structure 40 and the base plate 28. As shown in FIG. 1(B), the anchor bolts B1 are arranged on the Y-direction outer side of the web 22W of the H-shaped steel 22 and on the Y-direction outer side of both end portions of the flange 22F.

[0026] (reinforcing member) As shown in FIG. 1(A), the reinforcing member 30 includes an anchor bolt 32 and reinforcing concrete .

[0027] The anchor bolt 32 is a connecting member whose lower end is embedded in the foundation structure 40 and whose upper end protrudes from the foundation structure 40 and the base plate 28. The anchor bolt 32 is arranged along the column main reinforcement 26 to form a lap joint. The length L1 of this lap joint is set to a length that can transmit tensile force between the column main reinforcement 26 and the anchor bolt 32 when a bending moment and axial force act on the column 20.

[0028] 1(B), the anchor bolts 32 and the column main reinforcements 26 are arranged side by side with a gap in the X direction, i.e., in the minor axis direction of the H-shaped steel 22. The anchor bolts 32 are arranged on the outer side of the column main reinforcements 26 in the X direction, further outward in the X direction than the end of the flange 22F of the H-shaped steel 22. As a result, the lap joint between the anchor bolts 32 and the column main reinforcements 26 is a gap lap joint (a lap joint in which the reinforcing bars do not come into contact with each other).

[0029] As described above, the reinforced concrete 34 is concrete formed integrally with the concrete 24. Anchor bolts 32 are embedded in the reinforced concrete 34. As shown in FIG. 1(A), the reinforced concrete 34 is not disposed over the entire length of the column 20, but is disposed at a height that ensures a predetermined cover thickness upward from the upper end surface of the anchor bolt 32.

[0030] (Other structures) Although not shown in Fig. 1, a roof (not shown) is joined to the upper ends of the columns 20, and a single-story building is formed by a framework formed by the multiple columns 20 and the roof. To support the load of the roof, beams (not shown) can also be connected to the columns 20 as needed.

[0031] Furthermore, if the building is not a single-story building, a column on an upper floor (not shown) may be joined to the upper end of the column 20. The main reinforcement of the column on the upper floor and the column main reinforcement 26 of the column 20 can be connected using a mechanical joint or the like.

[0032] <How to reinforce pillars> To reinforce the column 20 with the reinforcing member 30, first, as shown in FIG. 2(A), the column main reinforcement 26 is placed between the flanges 22F of the H-shaped steel 22, and then concrete 24 is poured between the flanges 22F.

[0033] The concrete 24 is poured from the upper end of the H-shaped steel 22 to the height of the reinforced concrete 34 (see FIG. 1). This forms a column 20 with the main column reinforcement 26 protruding downward from the concrete 24.

[0034] In addition, although Figure 2(A) shows the state in which the column main reinforcement 26 protrudes below the concrete 24, when pouring the concrete 24, the work can be performed with the H-shaped steel 22 shown in Figure 2(A) turned upside down.

[0035] Alternatively, the H-beam 22 shown in Figure 2(A) can be rotated 90 degrees and the concrete 24 can be poured with the web 22W as the bottom surface. In this case, the concrete 24 is poured in two steps.

[0036] The base plate 28 is welded to the end face of the H-shaped steel 22 opposite to the side where the concrete 24 is poured. The base plate 28 may be welded to the H-shaped steel 22 before the above-mentioned step of pouring the concrete 24, or may be welded to the H-shaped steel 22 after the step of pouring the concrete 24.

[0037] 2(B), the upper ends of the anchor bolts 32 and B1 protruding from the foundation 40 are inserted into through holes (not shown) formed in the base plate 28. Bedding mortar M is laid between the base plate 28 and the foundation 40.

[0038] Next, as shown in Figure 2(C), formwork FW is placed on the outer side in the X direction and the Y direction of the anchor bolt 32, and post-cast concrete is poured. The post-cast concrete poured here integrally forms concrete 24 that covers the column main reinforcement 26 to form the column 20, and reinforced concrete 34 that covers the anchor bolt 32 to form the reinforcing member 30.

[0039] The formwork FW is formed to a height at least equal to the bottom surface of the concrete 24 integrated with the H-shaped steel 22, and preferably formed to a height higher than the bottom surface of the concrete 24. The post-cast concrete is poured to a height that reaches the bottom surface of the concrete 24 integrated with the H-shaped steel 22. This allows the column main reinforcement 26 and anchor bolts 32 to be embedded in the post-cast concrete.

[0040] After the post-cast concrete has hardened, the formwork FW is removed, thereby forming a column 20 reinforced by the reinforcing member 30, as shown in FIGS. 1(A) and 1(B).

[0041] <Action and effect> As described above, in the column reinforcement structure and column reinforcement method according to the embodiment of the present invention, as shown in FIG. 1, the upper ends of the anchor bolts 32 are arranged alongside the column main reinforcements 26, thereby forming a lap joint.

[0042] Furthermore, the anchor bolts 32 and the column main reinforcements 26 are arranged in the weak axis direction (X direction) of the H-shaped steel 22, thereby reinforcing the weak axis direction. This makes it possible to reinforce the column 20 in the weak axis direction. Specifically, the bending strength of the base of the column 20 in the weak axis direction is improved.

[0043] For example, a structural plane (structural plane along the weak axis direction of the H-shaped steel 22) formed by a column 20 and a roof (not shown) (or a beam (beam along the X direction) not shown joined to the column 20) may lack in-plane rigidity without the reinforcing member 30, but by providing the reinforcing member 30, the necessary in-plane rigidity can be obtained.

[0044] This allows the structural surface to be reinforced without the use of braces, which allows openings to be created within the structural surface, and also eliminates the need for steel materials to form braces.

[0045] Furthermore, by forming a lap joint between the anchor bolt 32 and the column main reinforcement 26, not only is the bending strength in the weak axis direction improved, but the bending strength in the strong axis direction is also improved.

[0046] In addition, in the column reinforcement structure and column reinforcement method according to the embodiment of the present invention, the column main reinforcement 26 and the anchor bolt 32 are connected with a gap lap joint. With a gap lap joint, there is no need for the column main reinforcement and the anchor bolt to come into contact with each other, making it easier to adjust the erection.

[0047] (Other embodiments) In the above embodiment, as shown in FIG. 1, the anchor bolts 32 are arranged on the outer side of the column main reinforcement 26 in the X direction, further outward in the X direction than the flanges 22F of the H-shaped steel 22, but the embodiment of the present invention is not limited to this.

[0048] 3, the anchor bolt 32 may be disposed on the outer side of the column main reinforcement 26 in the X direction, at a position sandwiched between both flanges 22F of the H-shaped steel 22. In this case, the reinforced concrete 34 is the same member as the concrete 24.

[0049] In such an embodiment, the column main reinforcement 26 and the anchor bolt 32 do not necessarily have to be joined by a gap lap joint, and for example, the column main reinforcement 26 and the anchor bolt 32 may be arranged in contact with each other.

[0050] In the above embodiment, as shown in FIG. 1(B), a plurality of column main reinforcements 26 are arranged side by side in the Y direction at positions sandwiched between both flanges 22F on each side of the web 22W, but the embodiment of the present invention is not limited to this.

[0051] For example, only one column main reinforcement 26 may be placed at a position sandwiched between both flanges 22F on each side of the web 22W. In this case, the same number of anchor bolts 32 as the column main reinforcement 26 is provided. Alternatively, the number of anchor bolts 32 may be greater than the number of column main reinforcement 26. [Explanation of symbols]

[0052] 20 pillars 22 H-beam 24 Concrete 28 Base Plate 30 Reinforcement member 32 anchor bolt 34 Reinforced Concrete 40 Basic structure (support)

Claims

1. a column having an H-shaped steel, concrete filled between flanges of the H-shaped steel, and column main reinforcement embedded in the concrete; a base plate joined to the lower end of the H-shaped steel and fixed to a support; an anchor bolt whose lower end is embedded in the support body and whose upper end protrudes from a through-hole formed in the base plate, and which is arranged along the column main reinforcement and in the weak axis direction of the column main reinforcement and the H-shaped steel; reinforced concrete that is integrated with the concrete and embeds the anchor bolt; A reinforced column structure having:

2. 2. The column reinforcement structure according to claim 1, wherein the column main reinforcement and the anchor bolt are formed as a gap lap joint.

3. The reinforced concrete is 2. The reinforcement structure for a column according to claim 1, wherein the anchor bolt is arranged outside the concrete in the weak axis direction, is not arranged over the entire length of the column, and is at a height that ensures a predetermined cover thickness upward from the upper end surface of the anchor bolt.

4. a step of placing column main reinforcements between flanges of an H-shaped steel and pouring concrete between the flanges to form a column in which the column main reinforcements protrude downward from the concrete; a step of inserting the upper end of an anchor bolt, the lower end of which is embedded in a support body, into a through-hole formed in a base plate of the column, and arranging the column main reinforcement and the anchor bolt so that they are aligned along each other and in the weak axis direction of the H-shaped steel; a step of pouring post-cast concrete around the column main reinforcement and the anchor bolt, and embedding the column main reinforcement and the anchor bolt in the post-cast concrete; A method of reinforcing a column with

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