Reinforced concrete pillars

Abstract

To provide a reinforced-concrete column that is lightweight while having strength, has a small number of reinforcement materials, and can be easily reinforced.SOLUTION: A reinforced-concrete column that is provided therein with multiple long, rod-shaped main bars 5 arranged side by side at intervals therebetween, the reinforced-concrete column has a first reinforcement material 41 which is a long, rod-shaped reinforcement material 4, one end 41a in the longitudinal direction of the first reinforcement material is fixed to any one main bar 5 among the multiple main bars 5 so that the first reinforcement material 41 is inclined with respect to the longitudinal direction 101 of the reinforced-concrete column, and the other end 41b is fixed to the main bar 5 at a position opposite to the main bar 5 to which the one end 41a is fixed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a reinforced concrete column for supporting a building, the strength of which is improved by providing long rod-shaped reinforcing members diagonally inside the column. [Background technology]

[0002] As described in Patent Document 1, conventionally, reinforced concrete columns have been known in which the strength has been improved by doubling the hoop reinforcement (hoop reinforcement) with outer and inner hoop reinforcement, the strength has been improved by arranging band-shaped plates, which have a shape corresponding to the horizontal cross-sectional shape of the reinforced concrete column, inside the reinforced concrete column at equal intervals in the longitudinal direction, and the strength has been improved by arranging a reinforcing core inside the reinforced concrete column, in which multiple plate-shaped protrusions extending in the longitudinal direction form a cross shape in the horizontal cross section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-316367 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the reinforced concrete column described in Patent Document 1, which has improved strength by arranging hoop reinforcement (hoop reinforcement) twice, with outer hoop reinforcement and inner hoop reinforcement, requires arranging multiple outer hoop reinforcement and inner hoop reinforcement at equal intervals along the length inside the column and fixing the outer hoop reinforcement, inner hoop reinforcement and main reinforcement to each other, which requires significantly more work than a typical reinforced concrete column.

[0005] In addition, in the reinforced concrete column described in Patent Document 1, the strength is improved by arranging strip plates, whose shape corresponds to the horizontal cross-sectional shape of the reinforced concrete column, at equal intervals along the length of the column. However, in order to arrange the strip plates at equal intervals along the length of the column, it is necessary to arrange multiple strip plates in a floating state on the inner surface of the formwork and fix them in place, which is time-consuming. Furthermore, the provision of multiple strip plates increases the weight of the column, which reduces the stability of long columns.

[0006] Furthermore, in the reinforced concrete column described in Patent Document 1, the strength of which is improved by placing inside a reinforcing core in which multiple longitudinally extending plate-like protrusions are formed in a cross shape in horizontal cross section, the reinforcing core must be placed inside the column in a floating state at approximately the center of the formwork and fixed in that position, which is time-consuming. Furthermore, the provision of a reinforcing core with multiple longitudinally extending plate-like protrusions increases the weight of the column, which reduces the stability of long columns.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a reinforced concrete column that can be easily equipped with lightweight reinforcing materials and is reinforced so as not to become heavy. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a reinforced concrete column having a plurality of long rod-shaped main reinforcements arranged at intervals inside the column, and the reinforced concrete column is a long rod-shaped reinforcing material. Two a first reinforcing member, the first reinforcing member being inclined with respect to the longitudinal direction of the reinforced concrete column; One of the above One end of the first reinforcing member in the longitudinal direction is the inner side of The other end is fixed to the main reinforcement the inner side of The main reinforcement at a position opposite to the inner side of Fixed to The other first reinforcing member has one end fixed to the inner side surface of the main reinforcement to which the other end of one of the first reinforcing members is fixed, and the other end fixed to the inner side surface of the main reinforcement to which one end of one of the first reinforcing members is fixed, and the two first reinforcing members cross each other in an X-shape inside the reinforced concrete column. It is characterized by:

[0010] Furthermore, the reinforced concrete column is provided with second reinforcing members which are long rod-shaped reinforcing members, and two of the second reinforcing members cross each other in an X-shape, and the second reinforcing members are diagonal to the longitudinal direction of the reinforced concrete column, so that one end of each of the intersecting second reinforcing members in the longitudinal direction is fixed to an arbitrary main reinforcing member among the plurality of main reinforcing members which is different from the main reinforcing members to which one end and the other end of each of the intersecting first reinforcing members are fixed, and the other end is fixed to the main reinforcing member at a position opposite to the main reinforcing member to which one end of the second reinforcing member is fixed.

[0011] Furthermore, the plurality of main reinforcements are arranged at intervals to form a square, and the main reinforcement to which the reinforcing material is fixed is the main reinforcement positioned at a corner of the square formed by the plurality of main reinforcements arranged side by side. [Effects of the Invention]

[0012] The reinforced concrete column of the present invention only requires fixing one end and the other end of the reinforcing material in the longitudinal direction to the main reinforcement, eliminating the need for the work of fixing a large number of hoops, pouring concrete with a floating strip plate, and pouring concrete with a floating reinforcing core, as in the reinforced concrete column of Patent Document 1, and thus easily improving strength. Furthermore, because the reinforcing material is a long, rod-shaped member, it is lighter than the strip plate and reinforcing core described in Patent Document 1, and the weight of the reinforced concrete column does not become too heavy.

[0013] Furthermore, by providing two reinforcing members that cross in an X-shape, the strength of the reinforced concrete column can be further increased.

[0014] Furthermore, the strength of the reinforced concrete column can be further increased by providing a first reinforcement member, which is two reinforcement members that intersect in an X-shape, and a second reinforcement member, which is two reinforcement members that intersect in an X-shape.

[0015] Furthermore, in a reinforced concrete column in which multiple main reinforcements are arranged at intervals to form a square, the strength of the reinforced concrete column can be further increased by suspending reinforcing materials in the diagonal direction of the square formed by the spaced apart main reinforcements. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing the internal structure of a reinforced concrete column according to a first embodiment of the present invention. [Figure 2] 1 is a plan view showing a reinforced concrete column according to a first embodiment of the present invention. FIG. [Figure 3] FIG. 10 is a perspective view showing the internal structure of a reinforced concrete column according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a plan view showing a reinforced concrete column according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a perspective view showing the internal structure of a reinforced concrete column according to a third embodiment of the present invention. [Figure 6] FIG. 10 is a plan view showing a reinforced concrete column according to a third embodiment of the present invention. [Figure 7] FIG. 10 is a cross-sectional view showing the inside of a reinforced concrete column according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The reinforced concrete column according to the present invention will be described below with reference to the drawings, with first to third embodiments. However, the following merely illustrates one embodiment of the present invention by way of example, and the scope of the present invention is not limited to the following embodiments, and appropriate modifications can be made without departing from the spirit of the present invention.

[0018] The drawings referred to in the explanation of the reinforced concrete column according to the present invention show the main reinforcement 5, ties 6, and reinforcing members 4, which will be described later, exposed for easy understanding, but in reality, the main reinforcement 5, ties 6, and reinforcing members 4 are placed inside the concrete 7. In addition, in order to clearly show the internal structure of the reinforced concrete column according to the present invention, the main reinforcement 5 and ties 6 on the front side of the drawings are shown as if they were cut.

[0019] First, we will explain a reinforced concrete column 1 of the first embodiment. As shown in Fig. 1, the reinforced concrete column 1 is a vertically long cylindrical column that includes a plurality of main reinforcements 5, which are long rod-shaped steel members, a plurality of hoops 6, which are ring-shaped steel members, and first reinforcements 41, which are long rod-shaped steel members reinforcing members 4, and is formed by pouring and curing concrete 7 to enclose these components.

[0020] As shown in Figures 1 and 2, the main reinforcements 5 of the reinforced concrete column 1 are arranged horizontally at intervals from each other in a position where the main reinforcements 5 form a circle in the longitudinal direction 101 of the reinforced concrete column 1, i.e., the vertical direction.

[0021] As shown in Figures 1 and 2, the tie bars 6 of the reinforced concrete column 1 are tie bars 61 formed by bending long steel rods into circular rings. The tie bars 61 are in contact with the outer side of each main reinforcement 5 so as to surround the circular periphery formed by the multiple main reinforcement bars 5 lined up as shown in Figure 2, and are arranged at intervals in the vertical direction from each other as shown in Figure 1. The main reinforcement bars 5 and the tie bars 61 are fixed to each other by welding.

[0022] As shown in Figures 1 and 2, the first reinforcement 41 of the reinforced concrete column 1 is positioned so that it is long and diagonal to the longitudinal direction 101 of the reinforced concrete column 1, i.e., the vertical direction, and one end 41a of the longitudinal direction of the first reinforcement 41 is fixed by welding to the inner side of a main reinforcement 51 arbitrarily selected from the multiple main reinforcements 5, and the other end 41b of the longitudinal direction of the first reinforcement 41 is fixed by welding to the inner side of a main reinforcement 52 positioned in a position opposite the main reinforcement 51 to which one end 41a of the first reinforcement 41 is fixed, so that the first reinforcement 41 is positioned and fixed so that it spans diagonally inside the reinforced concrete column 1.

[0023] As described above, when a reinforced concrete column 1 having a first reinforcing member 41 arranged diagonally inside the column 1 bends or buckles due to the application of force to the column 1, the main reinforcement 5, the tie bars 61, and the first reinforcing member 41 each try to maintain their normal posture, thereby improving the strength of the column 1.

[0024] In particular, when the reinforced concrete column 1 tries to bend in the direction 102 (shown in FIG. 2 ) in which the first reinforcement 41 is laid in a plan view looking down on the reinforced concrete column 1 from above, the first reinforcement 41 tries to expand or contract in its longitudinal direction. At this time, a stress that opposes the expansion or contraction in its longitudinal direction is generated in the first reinforcement 41, and as the first reinforcement 41 tries to maintain its normal posture, one end 41 a and the other end 41 b act to stretch or pull the fixed main reinforcements 51, 52, supporting the main reinforcements 51, 52, resulting in greater strength in the direction 102 in which the first reinforcement 41 is laid.

[0025] Next, a second embodiment of the reinforced concrete column 2 will be described. As shown in Fig. 3, the reinforced concrete column 2 is a rectangular column that is long in the vertical direction, and is provided with a plurality of main reinforcements 5, which are long rod-shaped steel members, a plurality of hoops 6, which are ring-shaped steel members, and two first reinforcements 41, which are long rod-shaped steel members reinforcing members 4, inside the column, and is formed by pouring and curing concrete 7 to enclose these components.

[0026] As shown in Figures 3 and 4, the main reinforcements 5 of the reinforced concrete column 2 are arranged horizontally at intervals from each other in a position where the length is in the longitudinal direction 101 of the reinforced concrete column 2, i.e., the vertical direction, so that multiple main reinforcements 5 form a square.

[0027] As shown in Figures 3 and 4, the tie bars 6 of the reinforced concrete column 2 are tie bars 62 formed by bending long steel rods into rectangular rings, and the tie bars 62 are in contact with the outer side of each main reinforcement 5 so as to surround the rectangular periphery formed by the multiple main reinforcement bars 5 lined up as shown in Figure 4, and are arranged at intervals from each other in the vertical direction as shown in Figure 3, and the main reinforcement bars 5 and the tie bars 62 are fixed to each other by welding.

[0028] As shown in Figures 3 and 4, one of the first reinforcement members 41 of the reinforced concrete column 2 is oriented so that its length is diagonally aligned with the longitudinal direction 101 of the reinforced concrete column 2, i.e., the vertical direction, and one end 41a of the first reinforcement member 41 in the longitudinal direction is fixed by welding to the inner side of any main reinforcement 53 located at the corner of a square formed by a row of multiple main reinforcements 5, and the other end 41b of the first reinforcement member 41 in the longitudinal direction is fixed by welding to the inner side of a main reinforcement 54 located at the corner opposite the main reinforcement 53 to which one end 41a of the first reinforcement member 41 is fixed.

[0029] 3 and 4, the other first reinforcement 41 of the reinforced concrete column 2 is oriented such that its length is diagonally aligned with the longitudinal direction 101 of the reinforced concrete column 2, i.e., the vertical direction, and the first reinforcement 41 and one of the first reinforcements 41 intersect in an X-shape. One end 41a of the first reinforcement 41 in the longitudinal direction is fixed by welding to the inner side of the main reinforcement 54 located at the corner opposite the main reinforcement 53 to which one end 41a of one of the first reinforcements 41 is fixed, and the other end 41b of the first reinforcement 41 is fixed by welding to the inner side of the main reinforcement 53 located at the corner opposite the main reinforcement 54 to which the other end 41b of one of the first reinforcements 41 is fixed. As a result, the one first reinforcement 41 and the other first reinforcement 41 are positioned and fixed so that they cross each other in an X-shape inside the reinforced concrete column 2 and are diagonally aligned.

[0030] As described above, when the reinforced concrete column 2 has one first reinforcing member 41 and the other first reinforcing member 41 arranged diagonally inside it, the main reinforcement 5, the tie bars 62, and the first reinforcing members 41 that cross each other in an X-shape each try to maintain their normal posture when the reinforced concrete column 2 tries to bend or buckle, thereby improving the strength of the reinforced concrete column 2.

[0031] In particular, when the reinforced concrete column 2 bends in the direction 102 (shown in FIG. 4 ) in which the first reinforcing members 41 intersecting each other in an X-shape are laid in a plan view of the reinforced concrete column 2 from above, the first reinforcing members 41 intersecting each other in an X-shape tend to expand or contract in their respective longitudinal directions. At this time, stresses that oppose the expansion or contraction in their respective longitudinal directions are generated in each first reinforcing member 41, and as each first reinforcing member 41 tries to maintain its normal posture, one end 41 a and the other end 41 b of each first reinforcing member 41 act to tension or pull the main reinforcing members 53, 54 to which they are fixed, thereby supporting the main reinforcing members 53, 54. As a result, the column has greater strength in the direction 102 in which the first reinforcing members 41 intersecting each other in an X-shape are laid.

[0032] Furthermore, in the case of a reinforced concrete column 2 in which a plurality of main reinforcements 5 are arranged to form a square, if there is no first reinforcement 41, the column would have high strength in the direction 104 (shown in FIG. 4 ) in which the main reinforcements 5 are arranged in a row because the main reinforcements 5 and the ties 62 in that row form a lattice-like surface. However, the strength in the diagonal directions of the square formed by the plurality of main reinforcements 5 arranged in a row is weaker than the strength in the direction 104 in which the main reinforcements 5 are arranged in a row. Therefore, in a reinforced concrete column 2 in which a plurality of main reinforcements 5 are arranged in a square, it is more effective to improve the strength of the reinforced concrete column 2 by setting the direction 102 in which the first reinforcement 41, which is the reinforcement 4, extends in the diagonal direction of the square formed by the plurality of main reinforcements 5 arranged in a row.

[0033] Next, a reinforced concrete column 3 of a third embodiment will be described. As shown in Fig. 5, the reinforced concrete column 3 is a rectangular column elongated in the vertical direction, and is provided with a plurality of main reinforcements 5, which are long steel rods, a plurality of ties 6, which are steel members formed into rings, two first reinforcements 41, which are long steel rod-shaped reinforcements 4, and two second reinforcements 42, which are also long steel rod-shaped reinforcements 4, and is formed by pouring and curing concrete 7 to enclose these components. Note that the main reinforcements 5, ties 6, and first reinforcements 41 of the reinforced concrete column 3 are similar to the main reinforcements 5, ties 6, and first reinforcements 41 of the reinforced concrete column 2 of the second embodiment, and therefore a description thereof will be omitted.

[0034] As shown in Figures 5 and 6, one of the second reinforcements 42 of the reinforced concrete column 3 is oriented so that its length is diagonally aligned with the longitudinal direction 101 of the reinforced concrete column 3, i.e., the vertical direction, and one end 42a of the second reinforcement 42 in the longitudinal direction is fixed by welding to the inner side of the main reinforcement 55 located at a corner other than the main reinforcements 53, 54 to which one end 41a and the other end 41b of each of the two first reinforcements 41 are fixed, and the other end 42b of the second reinforcement 42 in the longitudinal direction is fixed by welding to the inner side of the main reinforcement 56 located at the corner opposite the main reinforcement 55 to which one end 42a of the second reinforcement 42 is fixed.

[0035] 5 and 6, the other second reinforcing member 42 of the reinforced concrete column 3 is positioned so that it is long and oblique to the longitudinal direction 101 of the reinforced concrete column 3, i.e., the vertical direction, and so that the second reinforcing member 42 and one of the second reinforcing members 42 intersect in an X-shape. One end 42a in the longitudinal direction of the second reinforcing member 42 is fixed by welding to the inner side surface of the main reinforcing member 56 located at the corner opposite the main reinforcing member 55 to which one end 42a of one of the second reinforcing members 42 is fixed, and the other end 42b of the second reinforcing member 42 in the longitudinal direction is fixed by welding to the inner side surface of the main reinforcing member 55 located at the corner opposite the main reinforcing member 56 to which the other end 42b of one of the second reinforcing members 42 is fixed.

[0036] Furthermore, in the reinforced concrete column 3, one second reinforcement 42 and the other second reinforcement 42 are fixed to the main reinforcement 5 at a downward offset compared to one first reinforcement 41 and the other first reinforcement 41 so that the position where one first reinforcement 41 intersects with the other first reinforcement 41 does not overlap with the position where one second reinforcement 42 intersects with the other second reinforcement 42.

[0037] As described above, when the reinforced concrete column 3 having one first reinforcing member 41, the other first reinforcing member 41, one first reinforcing member 42 and the other first reinforcing member 42 arranged diagonally inside the column 3 bends or buckles, the main reinforcements 5 and tie bars 62 as well as the first reinforcing members 41 which intersect with each other in an X-shape and the second reinforcing members 42 which intersect with each other in an X-shape each try to maintain their normal posture, thereby improving the strength of the column 3.

[0038] In particular, when the reinforced concrete column 3 attempts to bend in the direction 102 (shown in Figure 6) in which the first reinforcement members 41 that intersect with each other in an X-shape are laid, or in the direction 103 (shown in Figure 6) in which the second reinforcement members 42 that intersect with each other in an X-shape are laid, in a plan view looking down on the reinforced concrete column 3 from above, the first reinforcement members 41 that intersect with each other in an X-shape or the second reinforcement members 42 that intersect with each other in an X-shape will attempt to expand or contract in their respective longitudinal directions. At this time, stress is generated in each first reinforcing member 41 or second reinforcing member 42 against its tendency to expand or contract in its respective longitudinal direction, and as each first reinforcing member 41 or second reinforcing member 42 tries to maintain its normal posture, one end 41a and the other end 41b or one end 42a and the other end 42b of each first reinforcing member 41 or second reinforcing member 42 acts to stretch or pull the main reinforcements 53, 54 or main reinforcements 55, 56 to which they are fixed, thereby supporting the main reinforcements 53, 54 or main reinforcements 55, 56.As a result, the first reinforcing members 41, which intersect with each other in an X-shape, span in a direction 102, and the second reinforcing members 42, which intersect with each other in an X-shape, span in a direction 103.

[0039] Furthermore, in a reinforced concrete column 3 in which a plurality of main reinforcements 5 are arranged to form a square, if there are no first reinforcement members 41 and second reinforcement members 42, the column 3 would have high strength in the direction 104 in which the main reinforcements 5 are arranged in a row (shown in FIG. 6 ) because the main reinforcements 5 and the ties 62 in the row form a lattice-like surface. However, the strength in the diagonal directions of the square formed by the main reinforcements 5 arranged in a row is weaker than the strength in the direction 104 in which the main reinforcements 5 are arranged in a row. Therefore, in a reinforced concrete column 3 in which a plurality of main reinforcements 5 are arranged to form a square, it is more effective to improve the strength of the column 3 by arranging the direction 102 in which the first reinforcement member 41, which is the reinforcement member 4, extends and the direction 103 in which the second reinforcement member 42, which is the reinforcement member 4, extends in the diagonal directions of the square formed by the main reinforcements 5 arranged in a row.

[0040] Furthermore, when a force is applied to the reinforced concrete column 3 and the column 3 attempts to twist, the first reinforcement members 41, which intersect with each other in an X-shape, and the second reinforcement members 42, which intersect with each other in an X-shape in a different direction from the first reinforcement members 41, each attempt to bend like a bow. At this time, stresses that counteract the bending are generated in the first reinforcement members 41 and second reinforcement members 42, and the first reinforcement members 41 and second reinforcement members 42 attempt to maintain their normal postures, thereby preventing the reinforced concrete column 3 from twisting.

[0041] FIG. 7 shows a cross section of another embodiment based on the reinforced concrete column 1 of the first embodiment. It is desirable for the reinforcing members 4 to be fixed so as to frame the main reinforcement bars 5 from the bottom to the top. However, when the reinforced concrete column of the present invention is long, the reinforcing members 4 may bend downward due to their own load. If the concrete 7 is poured and cured in this state, the reinforcing members 4 may not be expected to improve the strength of the column. Furthermore, while a long reinforcing member 4 is required to fit the length of the reinforced concrete column, there is a limit to the length of the reinforcing member 4 that can actually be procured. Therefore, as shown in FIG. 7 , the above problems can be solved by dividing the reinforcing member 4 into two pieces along the length of the reinforced concrete column and fixing each piece diagonally. Similar measures can be taken for the reinforced concrete column 2 of the second embodiment and the reinforced concrete column 3 of the third embodiment. The reinforcing member 4 may also be divided into two or more pieces along the length of the reinforced concrete column. [Industrial Applicability]

[0042] The reinforced concrete column according to the present invention is expected to be favorably adopted, particularly in the construction industry, and can contribute to the development of the construction industry. [Explanation of symbols]

[0043] 1. Reinforced concrete pillar 2. Reinforced concrete columns 3. Reinforced concrete columns 4 Reinforcement 41 First reinforcement material 41a One end of the first reinforcement 41b Other end of first reinforcement 42 Second reinforcement material 42a One end of the second reinforcement 42b Other end of second reinforcement 5 Main reinforcement 6 Stirrups 7. Concrete 101 Longitudinal direction of reinforced concrete columns

Claims

1. A reinforced concrete column having therein a plurality of long rod-shaped main reinforcements arranged at intervals from each other, the reinforced concrete column having two first reinforcements which are long rod-shaped reinforcing members, one end in the longitudinal direction of one of the first reinforcements is fixed to the inner side surface of any of the plurality of main reinforcements, and the other end is fixed to the inner side surface of the main reinforcement at a position opposite to the inner side surface of the main reinforcement to which the one end is fixed, so that the first reinforcement is oblique to the longitudinal direction of the reinforced concrete column, and the other first reinforcement has one end fixed to the inner side surface of the main reinforcement to which the other end of one of the first reinforcements is fixed, and the other end is fixed to the inner side surface of the main reinforcement to which one end of one of the first reinforcements is fixed, A reinforced concrete column characterized in that two of the first reinforcing members intersect in an X-shape inside the reinforced concrete column.

2. The reinforced concrete column is provided with a second reinforcement member, which is a long rod-shaped reinforcement member; 2. The reinforced concrete column according to claim 1, wherein two of the second reinforcing members intersect in an X-shape, and the second reinforcing members are diagonal to the longitudinal direction of the reinforced concrete column, so that one end of each of the intersecting second reinforcing members in the longitudinal direction is fixed to an arbitrary one of the plurality of main reinforcing members different from the main reinforcing members to which one end and the other end of each of the intersecting first reinforcing members are fixed, and the other end is fixed to the main reinforcing member at a position opposite to the main reinforcing member to which one end of the second reinforcing member is fixed.

3. The plurality of main reinforcements are arranged at intervals to form a square, 3. A reinforced concrete column according to claim 1, wherein the main reinforcement to which the reinforcing material is fixed is the main reinforcement positioned at the corner of a square formed by a plurality of the main reinforcements arranged side by side.

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