Column base fixing structure in buildings

Abstract

To provide a fixing structure for a column leg part in a building that can provide structural performance required for the building against a load acting on a column without any effort.SOLUTION: In a fixed structure for a column leg part in a building, a leg part of a column 3 is buried in a reinforced concrete floor 2. When a load associated with wind, earthquake, or the like acts on the column 3, the load is received by the floor 2 in which the leg part of the column 3 is buried. Reinforcing materials 7a, 7b, and 7c which receive the load are arranged at a site around the leg part on the floor 2 and distanced from the leg part, separetely from reinforcing bars of the floor 2. Structural performance required for the building against the load acting on the column 3 is ensured by the reinforcing materials 7a, 7b, 7c. The reinforcing materials 7a, 7b, 7c are arranged in advance around the leg part of the column 3 when placing concrete to form the floor 2 so as to be arranged on the floor 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fixing structure for a column base in a building. [Background technology]

[0002] 2. Description of the Related Art A known fixing structure for column bases in buildings is one in which the bases of columns are embedded in a reinforced concrete floor. The floors mentioned above include the earthen floor and the slab. The slab is supported by the beams of the building, and the earthen floor is supported by the ground. On top of the beams, an additional concrete portion may be formed by pouring more concrete after the beams are formed. This additional concrete portion is formed in the same way as the concrete poured to form the floor. For this reason, the additional concrete portion can be considered as part of the floor.

[0003] In Patent Document 1, the floor is supported by reinforced concrete beams, and anchor bolts fastened to the bases of the columns with nuts are embedded in the beams. In this case, when a load due to wind, earthquakes, etc. acts on the columns of the building, the load is borne by the anchor bolts embedded in the beams. This ensures the structural performance required for the building against the load acting on the columns. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-194036 Summary of the Invention [Problem to be solved by the invention]

[0005] In the fixing structure of the column base in a building shown in Patent Document 1, the anchor bolts fastened to the base of the column must be embedded in the reinforced concrete beam, which makes it very time-consuming to realize such a structure. [Means for solving the problem]

[0006] The means for solving the above problems and their effects will be described below. In a column base fixing structure for a building that solves the above-mentioned problems, the column base is embedded in a reinforced concrete floor, and reinforcing materials that support the load are arranged around the column base in this floor.

[0007] According to the above configuration, when a load due to wind, earthquake, or the like acts on the columns of a building, the load is borne by the floor in which the bases of the columns are buried. Reinforcement materials are arranged in the floor to bear the load. Therefore, the structural performance required by the building against the load acting on the columns can be ensured by the reinforcement materials, without the need for anchor bolts or the like as in the past. Furthermore, the reinforcement materials are arranged around the bases of the floor. Therefore, when pouring concrete to form the floor, the reinforcement materials can be easily arranged in the above-mentioned locations on the floor simply by arranging the reinforcement materials in advance in locations corresponding to the periphery of the bases of the columns.

[0008] In the fixing structure of the column base in the above-mentioned building, it is conceivable that the reinforcing material extends in a direction intersecting the thickness direction of the floor. In the fixing structure of the column base in the above-mentioned building, it is conceivable that the reinforcing material extends in the thickness direction of the floor.

[0009] With this configuration, if there is a border around the foot of a column in the floor, the reinforcing material can be placed inside the border. In the fixing structure of the column base in the above-mentioned building, the column is positioned to the side of the waist wall rising from the floor, and the reinforcing material is thought to extend in the thickness direction of the floor and reach the inside of the waist wall.

[0010] At the end of the floor, a spandrel wall for attaching an exterior wall is formed rising from the floor. The columns arranged to the sides of this spandrel wall are located close to the end of the floor. Therefore, when a load acts on the columns, there is a risk that the floor edge alone will not be able to ensure the structural performance required for the building against the load. However, with the above-mentioned configuration, the reinforcing material is arranged so that it extends in the thickness direction at the end of the floor and reaches the inside of the spandrel wall, so that the reinforcing material can ensure the structural performance required for the building against the load acting on the columns.

[0011] In the fixing structure of the column base in the above-mentioned building, the reinforcing material may be a plurality of reinforcing materials arranged so as to sandwich the base of the column. With this configuration, multiple reinforcing materials are arranged on the floor so that they sandwich the legs of the columns, making it easy to ensure the structural performance required of the building against loads acting on the columns by using the multiple reinforcing materials. [Brief explanation of the drawings]

[0012] [Figure 1] A cross-sectional view showing the area around the base of a column in a building. [Figure 2] FIG. 1 is a perspective view showing reinforcements assembled to form a floor. [Figure 3] FIG. 1 is a perspective view showing reinforcements assembled to form a floor. [Figure 4] 4 is a cross-sectional view showing the vicinity of the base of a column in a building as viewed from the direction of arrows IV-IV in FIG. 1. [Figure 5] 2 is a cross-sectional view showing the area around the base of a column in a building as viewed from the direction of arrows VV in FIG. 1. [Figure 6] A cross-sectional view showing the area around the base of a column in a building. [Figure 7] 7 is a cross-sectional view showing the periphery of the base of a column in a building as viewed from the direction of arrows VII-VII in FIG. 6. [Figure 8] 7 is a cross-sectional view showing the periphery of the base of a column in a building as viewed from the direction of arrows VIIII-VIIII in FIG. 6. [Figure 9]A cross-sectional view showing the area around the base of a column in a building. [Figure 10] 10 is a cross-sectional view showing the periphery of the base of a column in a building as viewed from the direction of arrow XX in FIG. 9. [Figure 11] 10 is a cross-sectional view showing the vicinity of the base of a column in a building as viewed from the direction of arrows XI-XI in FIG. 9. [Figure 12] A cross-sectional view showing the area around the base of a column in a building. [Figure 13] 13 is a cross-sectional view showing the periphery of the base of a column in a building as viewed from the direction of arrows XIII-XIII in FIG. 12. [Figure 14] 14 is a cross-sectional view showing the periphery of the base of a column in a building as viewed from the direction of arrows XIV-XIV in FIG. 12. DETAILED DESCRIPTION OF THE INVENTION

[0013] [First embodiment] Hereinafter, one embodiment of a fixing structure for a column base in a building will be described with reference to Figs.

[0014] As shown in FIG. 1, a building comprises beams 1, floors 2, and columns 3. Beams 1 and floors 2 are made of reinforced concrete. Floor 2 is supported by the ground and by beams 1. Columns 3 are made of, for example, steel frames. The steel frames forming columns 3 may be H-shaped, I-shaped, rectangular (quadrature), channel-shaped, equilateral mountain-shaped, or other shapes. Columns 3 may also be made of materials other than steel frames.

[0015] The base of the column 3 is buried in the floor 2. An additional concrete section 16 may be formed on top of the beam 1 after the beam 1 has been formed. The additional concrete section 16 is formed in the same way as the concrete is poured to form the floor 2. For this reason, the additional concrete section 16 can be considered to be part of the floor 2. The base of the column 3 is buried in this additional concrete section 16. The column 3 is located to the side of the spandrel wall 4 that rises from the floor 2. The spandrel wall 4 is used to attach the exterior walls of the building. For this reason, the spandrel wall 4 and the column 3 are located at the end of the floor 2.

[0016] In the above building, after the reinforced concrete beam 1 is formed, the floor 2, waist wall 4, and additional pouring section 16 are formed, and the legs of the columns 3 are buried in the additional pouring section 16. The floor 2, waist wall 4, and additional pouring section 16 are formed by assembling reinforcing bars 5, 6 as shown in Figures 2 and 3, and then pouring concrete. As a result, reinforcing bar 5 is arranged so as to extend horizontally inside the floor 2. Furthermore, reinforcing bar 6 is arranged so as to extend vertically inside the floor 2 and waist wall 4.

[0017] Before the concrete is poured on the floor 2, the columns 3 are suspended and their legs are positioned at locations corresponding to the additional pouring sections 16 (Fig. 1) on the beams 1. The legs of the columns 3 are buried in the additional pouring sections 16 after the concrete is poured. Loads due to wind, earthquakes, etc. act on the columns 3. For this reason, reinforcements 7a, 7b, and 7c are arranged around the legs of the columns 3 on the floor 2 at a distance from the legs to withstand the loads, separate from the reinforcing bars 5 and 6. The reinforcements 7a, 7b, and 7c are made of iron rods. The reinforcements 7a, 7b, and 7c are arranged as shown in Figs. 2 and 3 before the concrete is poured, and then buried in the floor 2 after the concrete is poured.

[0018] Next, the arrangement of the reinforcing members 7a, 7b, and 7c on the floor 2 will be described. Figure 4 shows the vicinity of the base of column 3 in the building as viewed from the direction of arrow IV-IV in Figure 1, and Figure 5 shows the vicinity of the base of column 3 in the building as viewed from the direction of arrow VV in Figure 1. Note that reinforcing bars 5 and 6 are omitted from Figures 1, 4, and 5 to make it easier to understand the arrangement of reinforcing members 7a, 7b, and 7c.

[0019] As shown in Figures 1, 4, and 5, reinforcements 7a, 7b, and 7c are multiple reinforcements arranged to sandwich the legs of column 3. The multiple reinforcements 7a, 7b, and 7c include those that extend in a direction (horizontal in this example) that intersects with the thickness direction of floor 2 (the vertical direction in Figures 1 and 4) and those that extend in the thickness direction of floor 2. Reinforcement 7a that extends in the thickness direction of floor 2 protrudes from floor 2 and reaches the inside of beam 1 and the inside of spandrel wall 4. Reinforcements 7b and 7c that extend in a direction that intersects with the thickness direction of floor 2 are arranged on both sides of the width direction (horizontal direction) of column 3, and extend in the same direction as beam 1.

[0020] As shown in Figure 1, of the reinforcing members 7b and 7c that extend in a direction that intersects with the thickness direction of the floor 2, reinforcing member 7b is located closer to the spandrel wall 4 than the column 3, while reinforcing member 7c is located on the opposite side of the column 3 from the spandrel wall 4. When a load acts on the column 3 due to wind, an earthquake, etc., the force of the column 3 pressing against the floor 2 due to that load is concentrated at specific points on the floor 2 around the legs of the column 3. Reinforcing members 7b and 7c are located in these points.

[0021] Next, the effects of the column base fixing structure in the building of this embodiment will be described. (1) When a horizontal load due to an earthquake or the like acts on a column 3 of a building, the load is borne by the floor 2, into which the base of the column 3 is buried. Reinforcements 7a, 7b, and 7c are arranged in the floor 2 to bear the load. Therefore, the structural performance required by the building against the load acting on the column 3 can be ensured by the reinforcements 7a, 7b, and 7c, without the need for anchor bolts as in the past. Furthermore, the reinforcements 7a, 7b, and 7c are arranged around the base of the floor 2 at a distance from the base, separately from the reinforcing bars 5 and 6 in the floor 2. The arrangement of the reinforcements 7a, 7b, and 7c on the floor 2 can be easily performed as follows. That is, before pouring concrete to form the floor 2, the reinforcements 7a, 7b, and 7c are arranged in advance in the above-mentioned locations around the base of the column 3. Then, by pouring the concrete, the reinforcements 7a, 7b, and 7c can be arranged in the above-mentioned locations in the floor 2 without any hassle.

[0022] (2) At the end of floor 2, a spandrel wall 4 for attaching an exterior wall is formed to rise from floor 2. Columns 3, located to the sides of this spandrel wall 4, are located close to the end of floor 2. For this reason, when a load acts on the columns 3, there is a risk that the end of floor 2 alone will not be able to ensure the structural performance required for the building against that load. However, because reinforcing members 7a are arranged at the end of floor 2, extending in the thickness direction and reaching the interior of the spandrel wall 4, reinforcing members 7a can ensure the structural performance required for the building against the load acting on columns 3. Furthermore, this effect is further enhanced by reinforcing members 7b arranged at the end of floor 2.

[0023] (3) Since multiple reinforcing members 7a, 7b, and 7c are arranged on the floor 2 so as to sandwich the legs of the columns 3, it is easy to ensure the structural performance required for the building against the load acting on the columns 3 by using the multiple reinforcing members 7a, 7b, and 7c.

[0024] (4) When a load is applied to the columns 3 due to wind, earthquakes, etc., the force of the columns 3 pressing against the floor 2 due to the load is concentrated at specific locations on the floor 2 around the legs of the columns 3. The reinforcing members 7b and 7c are arranged in such locations. Therefore, the reinforcing members 7b and 7c can prevent cracks and the like from occurring in the floor 2 due to the load.

[0025] [Second embodiment] Next, a second embodiment of the fixing structure for a column base in a building will be described with reference to FIGS.

[0026] 6, in this embodiment, a pillar 3 is placed at a location away from the end of the floor 2. The legs of this pillar 3 are placed at a location away from the end of the floor 2 and are embedded in a reinforced concrete section 16 that corresponds to the beam 1. Reinforcements 7b and 7c are placed on both sides of the pillar 3 in the width direction of the floor 2.

[0027] Figure 7 shows the area around the base of column 3 in the building as viewed from the direction of arrow VII-VII in Figure 6, and Figure 8 shows the area around the base of column 3 in the building as viewed from the direction of arrow VIIII-VIIII in Figure 6. As shown in Figures 6 to 8, reinforcements 7b and 7c are arranged to sandwich the base of column 3 and extend in a direction (horizontal in this example) that intersects with the thickness direction of floor 2. Reinforcements 7b and 7c extend in the same direction as beam 1 on both sides of the width direction (horizontal direction) of column 3.

[0028] According to this embodiment, the same effects as those (1), (3), and (4) in the first embodiment can be obtained. [Third embodiment] Next, a third embodiment of the fixing structure for a column base in a building will be described with reference to FIGS.

[0029] As shown in Figure 9, in this embodiment, the foot of the column 3 is buried in the reinforced concrete section 16 located at the end of the floor 2, as in the first embodiment. The floor 2 has a perimeter 12 surrounding the foot of the column 3. The perimeter 12 separates the area around the foot of the column 3 from the rest of the floor 2, thereby preventing cracks that occur around the foot of the column 3 in the floor 2 from extending beyond the perimeter 12. The perimeter 12 is created as follows: after the area around the foot of the column 3 in the floor 2 is formed, the area around the foot of the column 3 is formed, and the perimeter 12 is created at the boundary between them. Reinforcements 7a, 7b, and 7c are arranged on both sides of the width of the column 3 in the floor 2, sandwiching the foot of the column 3.

[0030] Fig. 10 shows the vicinity of the base of column 3 in the building as viewed from the direction of arrow XX in Fig. 9, and Fig. 11 shows the vicinity of the base of column 3 in the building as viewed from the direction of arrow XI-XI in Fig. 9. As shown in Figs. 9 to 11, reinforcing members 7a and 7b are located closer to the spandrel wall 4 than column 3, and reinforcing member 7c is located on the opposite side of column 3 from the spandrel wall 4.

[0031] Reinforcement 7a extends in the thickness direction of floor 2, protruding from floor 2 to reach the inside of beam 1 and the inside of spandrel wall 4. Reinforcement 7b extends in a direction intersecting the thickness direction of floor 2 and in the same direction as beam 1. Reinforcement 7c is located inside edge trim 12, at a distance from the leg of column 3. Reinforcement 7c has two straight sections 13 that extend parallel to each other in the thickness direction of floor 2, and a connecting section 14 that connects the upper ends of straight sections 13.

[0032] According to this embodiment, in addition to the same effects as those (1) to (3) of the first embodiment, the following effects can be obtained. (5) The straight portion 13 of the reinforcing member 7c extends in the thickness direction of the floor 2. Therefore, when a siding 12 is present around the leg of the column 3 in the floor 2, the reinforcing member 7c can be placed inside the siding 12.

[0033] [Fourth embodiment] Next, a fourth embodiment of the fixing structure for a column base in a building will be described with reference to FIGS.

[0034] As shown in Figure 12, in this embodiment, similar to the second embodiment, the legs of the columns 3 are buried in reinforced sections 16 that are away from the ends of the floor 2 and correspond to the beams 1. The floor 2 has edge guards 15 that surround the legs of the columns 3. These edge guards 15 play the same role as the edge guards 12 in the third embodiment. Reinforcements 7b and 7c are arranged on both sides of the column 3 in the width direction on the floor 2, sandwiching the legs of the column 3 therebetween.

[0035] Fig. 13 shows the vicinity of the base of column 3 in the building as viewed from the direction of arrows XIII-XIII in Fig. 12, and Fig. 14 shows the vicinity of the base of column 3 in the building as viewed from the direction of arrows XIV-XIV in Fig. 12. As shown in Figs. 12 to 14, reinforcing members 7b and 7c have straight portions 13 and connecting portions 14, similar to reinforcing member 7c of the third embodiment. Straight portions 13 of reinforcing members 7b and 7c extend in the thickness direction of floor 2. Reinforcing members 7b and 7c are arranged inside edge trim 15 and at a distance from the base of column 3.

[0036] According to this embodiment, the same effects as (1) to (4) in the first embodiment and the same effect as (5) in the third embodiment can be obtained. [Other embodiments] The above-described embodiments can be modified, for example, as follows: The above-described embodiments and the following modifications can be combined with each other within the scope of technical compatibility.

[0037] The reinforcing material that bears the load acting on the column 3 may be arranged on only one of the two sides of the column 3 in the width direction of the floor 2. The legs of the pillars 3 may be embedded in the floor 2 at a location other than the reinforced concrete portion 16.

[0038] In the first and third embodiments, one of the reinforcing members 7a and 7b may be omitted. In the first and third embodiments, the reinforcing material 7 a does not necessarily have to extend to the inside of the waist wall 4 .

[0039] The waist wall 4 in the first and third embodiments may be omitted. In the first, second, and third embodiments, the height position of the reinforcing member 7b may be changed as appropriate.

[0040] In the first and second embodiments, the height position of the reinforcing member 7c may be changed as appropriate. In the first and third embodiments, the reinforcing members 7a extending in the thickness direction of the floor 2 may be U-shaped or L-shaped.

[0041] In the third embodiment, the reinforcing members 7c extending in the thickness direction of the floor 2 may be linear or L-shaped. In the fourth embodiment, the reinforcing members 7b and 7c extending in the thickness direction of the floor 2 may be linear or L-shaped.

[0042] In the first to third embodiments, the reinforcing members extending in a direction intersecting the thickness direction of the floor 2 do not necessarily have to be straight, and may be curved as appropriate. In the third and fourth embodiments, the edge breakers 12 and 15 may be omitted.

[0043] In the first to fourth embodiments, the reinforcing members 7b and 7c may be in contact with the legs of the pillars 3. In the first to fourth embodiments, the reinforcing material does not have to be rod-shaped and may be flat-plate-shaped. The reinforcing material does not have to be made of iron and may be made of a material other than iron.

[0044] In the first to fourth embodiments, the number of reinforcing members may be changed as appropriate. [Explanation of symbols]

[0045] 1...Beam 2...Floor 3...pillar 4...waist wall 5,6...Reinforced concrete 7a,7b,7c…Reinforcement material 12...Severing ties 13...Straight section 14...Connection 15...Severing ties 16...Additional shots

Claims

1. In a column base fixing structure in a building, the base of a column formed by a steel frame is embedded in a floor made of reinforced concrete, so that the base of the column is fixed to the floor only by the concrete that forms the floor, A reinforcing material is arranged around the base of the column on the floor to receive the force of the column pushing against the floor when a horizontal load due to wind or earthquake acts on the column, The reinforcing member is located at a position where a force generated when the column presses against the floor due to the load is concentrated, The floor has a border around the base of the column, The edge separation divides the area around the foot of the column from the rest of the floor, the reinforcing material includes a first reinforcing material and a second reinforcing material; The first reinforcement member extends in a direction intersecting the thickness direction of the floor, and The column is arranged so as to sandwich the leg portion of the column between the column and the second reinforcing member, The second reinforcing member has two straight portions extending in the thickness direction of the floor so as to be parallel to each other, and a connecting portion extending in a direction intersecting the thickness direction of the floor so as to connect the upper ends of the straight portions, and is arranged around the foot of the column on the floor and inside the edge trim at a location surrounded by the edge trim, A fixing structure for a column base in a building, in which the straight portion and the connecting portion of the second reinforcing material are integrally formed by bending a rod-shaped iron.

2. 2. A column base fixing structure for a building as described in claim 1, wherein a reinforcing material other than the reinforcing material is arranged around the base of the column in the floor so as to extend in the thickness direction of the floor.

3. The pillars are arranged on the sides of the spandrel walls that rise from the floor, 3. The column base fixing structure for a building according to claim 2, wherein the other reinforcing member extends in the thickness direction of the floor and reaches the inside of the spandrel wall.

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