Reinforced concrete members

Abstract

To provide a reinforced concrete member for preventing buckling of an axial reinforcing bar in an easy structure, and enhancing deformability.SOLUTION: A column member 2 configuring a part of a reinforced concrete structure 1 is provided with concrete 5, an axial reinforcing bar 10 to be arranged inside the concrete 5, and a steel pipe 20 in a prescribed length to be fitted onto an axial part of the axial concrete 10.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] This invention relates to a method for constructing a reinforced concrete structure using deformed bars as axial reinforcement, for example. The pillar member This relates to reinforced concrete members that constitute the structure. [Background technology]

[0002] Conventionally, many reinforced concrete structures have been constructed in which reinforcing bars with high tensile strength are placed inside concrete, which has high compressive strength but low tensile strength. Such reinforced concrete structures are composed of individual reinforced concrete members.

[0003] In reinforced concrete members, the concrete contains reinforcement bars such as axial bars (also called main bars) that run along the length of the member, with stress calculated based on the design load, distribution bars that are placed perpendicular to the axial bars to distribute stress, stirrups which are horizontal bars that surround the axial bars, and tie bars that surround the axial bars and are placed at right angles to them to prevent buckling of the axial bars and provide shear reinforcement.

[0004] For example, when a column made of reinforced concrete receives horizontal force during an earthquake, damage occurs at the base of the column. If the deformation becomes large, the axial reinforcing bars of the column buckle, causing a large drop in load and impairing the column's performance.

[0005] For this reason, for example, Patent Document 1 claims that an inexpensive shear reinforcement structure can be realized by burying steel pipes so that they intersect with the diagonal crack surfaces caused by shear loads. As in Patent Document 1, in order to improve the deformation performance and shear strength of reinforced concrete members, it is necessary to place a large number of tie bars around the periphery of all axial rebars. However, it takes a lot of time and effort to place a large number of tie bars and to fill the concrete securely. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2007-204985 A Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above-mentioned problems, an object of the present invention is to provide a reinforced concrete member that suppresses buckling of axial reinforcing bars with a simple structure and improves deformation performance. [Means for solving the problem]

[0008] The present invention relates to a reinforced concrete structure that is constructed of horizontal deck members, beam members, and column members extending vertically between the deck members and the beam members, and that is configured so that the beam members are supported by the column members. The pillar member a column member including concrete, an axial reinforcing bar arranged inside the concrete, a tube of a predetermined length fitted around at least a part of the axial reinforcing bar, and a cap having a through hole penetrating the axial reinforcing bar, closing an upper end of the tube, and preventing the concrete from entering the inside of the tube. The cap is provided only at the upper end of the tube, and the tube is positioned so that its lower end is located on the upper surface of the deck member. Reinforced concrete members are members that deform when an external force acts on them, such as pillar members, beam members, etc. Reinforced concrete members may be reinforced with appropriate reinforcing bars, such as axial reinforcing bars, reinforcing bars, stirrups, or tie bars.

[0009] According to this invention, it is possible to suppress buckling of axial reinforcement bars with a simple structure and improve the deformation performance of reinforced concrete members. More specifically, when an external force acts on a reinforced concrete member in the bending direction, bending deformation occurs. If the amount of bending deformation becomes large, the axial reinforcing bars attached to the concrete also bend significantly and buckle. This significantly reduces the deformation capacity of the reinforced concrete member.

[0010] In contrast, by fitting at least a portion of the axial direction of the axial reinforcing bar arranged inside the concrete with a tube of a predetermined length, the concrete constituting the reinforced concrete member and the portion of the axial reinforcing bar fitted with the tube (hereinafter referred to as the fitted portion) are separated by the tube and are not integrated. Therefore, the fitted portion does not follow the deformation of the concrete of the reinforced concrete member, which is bent by the action of an external force, and can prevent the axial reinforcing bar from buckling. In this way, buckling of the axial reinforcing bar due to bending deformation can be prevented, and the deformation performance of the reinforced concrete member can be improved.

[0011] As an aspect of the present invention, the pipe may be arranged in a range in the axial direction where a bending load is large when an external force acts on a standard concrete member of a standard cross-sectional structure comprising the axial steel bars and the concrete.

[0012] The standard concrete member of the above-mentioned standard cross-sectional structure is a reinforced concrete member provided with the same axial reinforcing bars and concrete as the reinforced concrete member, that is, a reinforced concrete member that does not have a tubular body in the reinforced concrete member of the present invention, and may further include appropriate reinforcing bars such as distribution bars, stirrups, or tie bars.

[0013] The range in which the bending load is large when an external force acts on the above-mentioned standard concrete member is, for example, a certain range including the joint between the footing and the column member, or a certain range including the joint between the beam member and the column member, and is a range in which the application of an external force to the standard concrete member causes large deformation and may result in buckling of the axial reinforcing bars.

[0014] According to this invention, the range where the bending load is large when an external force acts on the standard concrete member is the range where the axial reinforcing bar may buckle due to the large deformation caused by the external force acting on the standard concrete member, that is, the range where the axial reinforcing bar deforms greatly in response to the large deformation of the concrete due to the action of the external force, so that the concrete and the fitted part of the axial reinforcing bar can be separated by the pipe. Therefore, the fitted part can better prevent the axial reinforcing bar from buckling without following the deformation of the concrete of the reinforced concrete member which is bent by the action of the external force.

[0015] In another aspect of the present invention, the pipe body may be arranged in a range in the axial direction where a bending load acts that causes bending cracks when an external force acts on a standard concrete member comprising the axial reinforcement and the concrete. The range of bending loads that cause bending cracks when an external force acts on a standard concrete member comprising the above-mentioned axial reinforcement and concrete is the range in which bending cracks occur in the standard concrete member due to the action of an external force.

[0016] According to this invention, it is possible to prevent the occurrence of bending cracks in the reinforced concrete member due to the action of external forces, and it is possible to construct the reinforced concrete member having durability. In more detail, the axial reinforcing bars in the fitted portion within the range of bending load that would cause bending cracks when an external force acts on a standard concrete member comprising the axial reinforcing bars and the concrete are separated from the concrete by the pipe body, so there is no mutual constraint between the axial reinforcing bars and the concrete due to adhesion. Therefore, the fitted portion becomes as if it were made of round steel reinforcing bars, and bending cracks can be prevented from occurring in the reinforced concrete member.

[0017] In a further aspect of the present invention, the inside of the pipe may be filled with grout material. According to the present invention, the axial reinforcing bars can be axially connected to each other inside the pipe, that is, the pipe and the grout material can cooperate to function as a joint for the axial reinforcing bars.

[0018] As another aspect of the present invention, the pipe body may be configured to fit a plurality of the axial reinforcing bars together. According to this invention, since it is possible to fit a tube body around multiple axial reinforcing bars collectively, compared to the case where a tube body is fitted around each of the multiple axial reinforcing bars, the work of fitting the tube body can be reduced and construction can be performed more efficiently.

[0019] As a further aspect of the present invention, a thin fiber reinforcing material may be wound around the outer periphery of the tube. The above-mentioned thin fiber reinforcing material includes a strip-shaped reinforcing material in which the fibers are continuous in the longitudinal direction, a sheet-shaped reinforcing material, and the like. According to this invention, the outer periphery of the pipe body can be restrained by the fiber reinforcing material, so that the shear strength of the pipe body can be improved.

[0020] As a further aspect of the present invention, the fiber reinforcing material may be wound collectively around the outer periphery of a plurality of the pipes. The fiber reinforcing material may be wound around each of a plurality of pipes, or may be wound around all of the pipes together. According to this invention, the shear strength of the reinforced concrete member in the area where the pipe is arranged can be improved, and therefore the deformation performance of the reinforced concrete member can be improved.

[0021] As a further aspect of the present invention, reinforcing fibers may be mixed into the concrete surrounding the pipe body. According to the present invention, the shear strength of the reinforced concrete member can be improved in the area where reinforcing fibers are mixed into the concrete, and therefore the deformation performance of the reinforced concrete member can be improved.

[0022] The fiber reinforcement may be wrapped around the outer periphery of a plurality of the pipes together, and reinforcing fibers may be mixed into the concrete surrounding the pipes, thereby further improving the shear strength of the reinforced concrete member in the area where the pipes are arranged, and further improving the deformation performance of the reinforced concrete member. Effect of the Invention

[0023] According to the present invention, it is possible to provide a reinforced concrete member that suppresses buckling of axial reinforcing bars with a simple structure and improves deformation performance. [Brief description of the drawings]

[0024] [Figure 1] Cross-sectional view of a column member of a reinforced concrete structure. [Diagram 2] FIG. [Diagram 3] An enlarged cross-sectional view of a column member where a steel pipe is fitted around the axial reinforcement. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 13 is an enlarged cross-sectional view of a column member in a portion where a steel pipe is fitted onto an axial reinforcing bar in another embodiment. [Figure 8] FIG. 11 is a cross-sectional view of a column member of a reinforced concrete structure according to another embodiment. [Figure 9] 13 is a cross-sectional view of a column member of a reinforced concrete structure according to still another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross-sectional view of a column member 2 of a reinforced concrete structure 1, FIG. 2 shows an oblique view of the column member 2, FIG. 3 shows an enlarged cross-sectional view of the column member 2 at a portion where a steel pipe 20 is fitted around an axial reinforcing bar 10, FIG. 4 and FIG. 5 show oblique views explaining the construction of the column member 2, and FIG. 6 shows an oblique view of the column member 2 in the completed construction state.

[0026] More specifically, Fig. 1 shows a vertical cross-sectional view of a portion of a reinforced concrete structure 1 where a column member 2 is arranged. Fig. 2 shows a perspective view of the column member 2, which is illustrated in a see-through state in order to clarify the internal structure of the column member 2. Fig. 3 shows an enlarged cross-sectional view of the column member 2 at a portion where a steel pipe 20 is fitted onto an axial reinforcing bar 10, which is an enlarged view of part a in Fig. 1.

[0027] 4 and 5, which show perspective views for explaining the construction of the column member 2, will be described in detail. FIG. 4(a) shows a perspective view of the state in which the axial reinforcing bar 10 protrudes from the deck member 3, FIG. 4(b) shows a perspective view of the state in which the steel pipe 20 is attached to the axial reinforcing bar 10 protruding from the deck member 3, FIG. 5(a) shows a perspective view of the state in which the cap 21 is attached to the upper end of the steel pipe 20, and FIG. 5(b) shows a perspective view of the state in which the continuous fiber band 22 is wound around and attached to the steel pipe 20 to which the cap 21 is attached. FIG. 6 shows a perspective view of the column member 2 completed by pouring concrete 5. In FIG. 6, the internal structure of the axial reinforcing bar 10 and the steel pipe 20 in the column member 2 are shown by dashed lines.

[0028] As shown in Figure 1, a portion of a reinforced concrete structure 1 is composed of a horizontal deck member 3, a beam member 4, and a column member 2 extending vertically between the deck member 3 and the beam member 4, and is configured so that the beam member 4 is supported by the column member 2. The deck member 3 is a reinforced concrete member of a predetermined thickness extending horizontally. The deck member 3, which is a horizontal reinforced concrete member, has horizontal axial reinforcing bars 10 arranged at intervals in the vertical direction, and distribution bars 11 arranged perpendicular to the axial reinforcing bars 10, forming a lattice shape in a plan view. Stirrups 12 are also provided to surround the axial reinforcing bars 10 arranged at intervals in the vertical direction. In this way, the deck member 3 is constructed by pouring concrete 5 around the reinforcing bars assembled with the axial reinforcing bars 10, distribution bars 11, and stirrups 12 at predetermined intervals.

[0029] The beam member 4 is a reinforced concrete member of a predetermined thickness extending horizontally. The beam member 4, which is a horizontal reinforced concrete member, has horizontal axial reinforcing bars 10 arranged at intervals in the vertical direction, and has tie bars 13 surrounding the axial reinforcing bars 10 arranged at intervals in the vertical direction. In this manner, the beam member 4 is constructed by pouring concrete 5 into the reinforcing bars in which the axial reinforcing bars 10 and tie bars 13 are assembled at predetermined intervals.

[0030] As shown in Fig. 2, the column member 2 is a reinforced concrete member extending in the vertical direction and having a square shape in a plan view. The column member 2, which is a reinforced concrete member, includes an axial reinforcing bar 10, a steel pipe 20 that fits around the base of the axial reinforcing bar 10, a cap 21 that closes the upper end of the steel pipe 20, a continuous fiber band 22 that is wrapped around the steel pipe 20, and concrete 5. Although not shown in the present specification, a hoop may be provided above the steel pipe 20.

[0031] As shown in Fig. 3, the axial rebars 10 are deformed rebars with nodes formed on the outer peripheral surface, and a plurality of them are provided at predetermined intervals along a position that ensures a predetermined cover thickness from the outer peripheral surface that is square in plan view. The upper and lower ends of the axial rebars 10 have L-shaped portions 10a bent at right angles, which are connected to the axial rebars 10 of the deck slab member 3 and the beam member 4. The L-shaped portion 10a bent at a right angle on the upper end side of the axial rebars 10 is provided by joining the L-shaped rebars.

[0032] The steel pipe 20 fitted around the base of the axial reinforcing bar 10 is cylindrical with a predetermined thickness and is formed with a diameter that ensures a predetermined distance between the steel pipes 20 fitted around adjacent axial reinforcing bars 10. The steel pipe 20 fitted onto the base of the axial reinforcing bar 10 is formed with a length that includes a range (high load range H) where a large bending load is applied when an external force acts on the column member 2.

[0033] More specifically, the high load range H is a range in which large deformation occurs and the axial rebar 10 may buckle when an external force is applied to a column member of a standard cross-sectional structure of the same cross section, which is constructed with a general reinforcement structure in which the axial rebar is not fitted with the steel pipe 20 but is instead fitted with tie bars. In the case of a column member, the high load range H is a specified range on the base side close to the deck, and large deformation occurs in the high load range H, which may cause the axial rebar to buckle.

[0034] In this way, the range in which the axial reinforcing bar 10 in a column member of a standard cross-sectional structure is at risk of buckling due to the action of external force is defined as the high load range H, and the steel pipe 20 is formed to a length that can encompass the high load range H when the axial reinforcing bar 10 is fitted around it. In this embodiment, the steel pipes 20 are arranged so that their lower ends are located on the upper surface 3a of the deck member 3, but depending on the position of the high load range H, they may be arranged above and spaced a specified distance from the upper surface 3a of the deck member 3. In addition, the portion of the axial reinforcing bar 10 that is fitted onto the steel pipe 20, i.e., the axial reinforcing bar 10 inside the steel pipe 20, is referred to as the fitted portion 100.

[0035] The cap 21 is a cap that is circular in plan view for closing the upper end of the steel pipe 20, and has a through hole for passing the axial reinforcing bar 10 through it. The cap 21 may be made of any suitable material, but in order to pass the axial reinforcing bar 10 through the through hole, it is preferable to provide a slit that radially connects the through hole and the outer periphery, and pass the axial reinforcing bar 10 through the slit to pass it through the through hole, which will improve workability. The cap 21 may also be made of a mesh or the like, as long as it can prevent the intrusion of the concrete 5 into the inside of the steel pipe 20.

[0036] The continuous fiber band 22 is a band-like band that is wound around the outer periphery of the steel pipes 20 that are fitted around each of the axial reinforcing bars 10. The continuous fiber band 22 has fibers that are continuous in the longitudinal direction, and is a band with high strength in the longitudinal direction. In this embodiment, the continuous fiber band 22 is provided at two locations spaced a predetermined distance apart in the height direction, but it may be provided at three or more locations, or may be provided at only one location.

[0037] A construction method for constructing the pillar member 2 thus configured will be briefly described with reference to Figs. First, as shown in Fig. 4(a), the deck member 3 is constructed. At this time, the steel pipes 20 of the column members 2 have their lower end L-shaped portions 10a bound to the axial reinforcing bars 10 of the deck member 3, and the axial reinforcing bars 10 protrude from the upper surface 3a of the constructed deck member 3 so as to extend vertically.

[0038] In this way, the steel pipes 20 are fitted onto each of the axial reinforcing bars 10 protruding from the top surface 3a of the deck member 3 (see FIG. 4(b)). In the column member 2, a high load range H is set above the top surface 3a of the deck member 3, so the steel pipes 20 are set to be placed on the top surface 3a. However, if the high load range H is set above the top surface 3a with a gap between them, the steel pipes 20 are set above the top surface 3a. It is also preferable to use a separator or the like to ensure a gap between the axial reinforcing bar 10 and the steel pipe 20, that is, to position the axial reinforcing bar 10 at the center of the steel pipe 20.

[0039] In order to prevent concrete 5 from entering the inside of the steel pipes 20 set as described above, caps 21 are attached to the upper ends of the steel pipes 20 (see Figure 5(a)), and continuous fiber bands 22 are wrapped around and attached to the steel pipes 20 to be fitted onto each of the axial reinforcing bars 10 (see Figure 5(b)).

[0040] After this, tie bars and the like (not shown) are installed above the axial reinforcing bars 10, and a formwork (not shown) is erected around the axial reinforcing bars 10 to ensure the specified cross section. Fresh concrete is poured into the formwork to complete the column member 2 composed of the concrete 5 and the axial reinforcing bars 10 (see Figure 6).

[0041] In addition, in the completed state of this column member 2, although not shown in the figure, the axial reinforcing bars 10 protrude from the upper end of the column member 2, and the L-shaped portion 10a is connected to the axial reinforcing bars 10 protruding from the upper end of the column member 2 and bound to the axial reinforcing bars 10 of the beam member 4 to construct the beam member 4.

[0042] As described above, the column member 2 constituting part of the reinforced concrete structure 1 is composed of concrete 5, axial reinforcing bars 10 arranged inside the concrete 5, and steel pipes 20 of a predetermined length fitted around part of the axial direction of the axial reinforcing bars 10. Therefore, the simple structure can suppress buckling of the axial reinforcing bars 10 and improve the deformation performance of the column member 2.

[0043] More specifically, when an external force acts on a column member in the bending direction, bending deformation occurs. If the amount of bending deformation becomes large, the axial reinforcing bars attached to the concrete also bend significantly and buckle. This significantly reduces the deformation performance of the column member.

[0044] In contrast, by fitting a steel pipe 20 of a predetermined length to a part of the axial direction of the axial reinforcing bar 10 arranged inside the concrete 5, the concrete 5 constituting the column member 2 and the fitted part 100 of the axial reinforcing bar 10 fitted with the steel pipe 20 are separated by the steel pipe 20 and are not integrated. Therefore, the fitted part 100 can prevent the axial reinforcing bar 10 from buckling without following the deformation of the concrete 5 of the column member 2 which is bent by the action of an external force. In this way, since buckling of the axial reinforcing bar 10 due to bending deformation can be prevented, the deformation performance of the column member 2 can be improved.

[0045] In addition, since the continuous fiber bands 22 are wound collectively around the outer periphery of the plurality of steel pipes 20, it is possible to improve the shear strength of the pillar member 2 in the range where the steel pipes 20 are arranged. Therefore, it is possible to improve the deformation performance of the pillar member 2.

[0046] In the above explanation, the concrete 5 is formed by pouring ready mixed concrete inside the formwork, but as shown in Fig. 7, the column member 2 may be formed of fiber reinforced concrete 5a by pouring ready mixed concrete containing steel fibers 6 at least around the steel pipe 20. In the case of fiber reinforced concrete 5a containing steel fibers 6 in this manner, the continuous fiber bands 22 may be omitted.

[0047] In this way, by mixing the steel fibers 6 into the fiber reinforced concrete 5a around the steel pipe 20, in addition to the above-mentioned effects, it is possible to improve the shear strength of the column member 2 in the high load range H in which the steel fibers 6 are mixed. Therefore, it is possible to improve the deformation performance of the column member 2.

[0048] For example, in the column member 2, the steel pipes 20 are arranged so as to include the high load range H where the axial reinforcing bars 10 may buckle due to the action of an external force in a column member of a standard cross-section structure, but as shown in Fig. 8, the axial reinforcing bars 10 may be fitted externally with long steel pipes 20a having a length covering the entire height of the column member 2 so as to include the crack load range H2. In this case, the load range H2 is the range where a bending load acts that causes bending cracks when an external force acts on a column member of a standard cross-section structure.

[0049] As described above, by arranging the long steel pipe 20a in the load range H2 in the axial direction when an external force acts on a column member of a standard cross-section structure, it is possible to prevent bending cracks from occurring in the column member 2 due to the action of the external force, and a durable column member 2 can be constructed.

[0050] In more detail, when an external force acts on a column member of standard cross-section structure, the axial reinforcing bars 10 in the fitted portion 100 in the load range H2 are separated from the concrete 5, so there is no mutual constraint between the axial reinforcing bars 10 and the concrete 5 due to adhesion. Therefore, the fitted portion 100 becomes as if it were made of round steel reinforcing bars, and bending cracks can be prevented from occurring in the column member 2.

[0051] Furthermore, in the above description, the cap 21 is attached to the upper end of the steel pipe 20 to prevent the concrete 5 from entering the inside of the steel pipe 20, but as shown in Fig. 9, the axial reinforcing bar 10 extending upward from the upper surface 3a may be joined to another steel pipe 20 inside the steel pipe 20, and the inside of the steel pipe 20 may be filled with grout material 7. In this case, the cap 21 does not need to be attached.

[0052] As described above, since the grout material 7 is filled inside the steel pipe 20, the axial reinforcing bars 10 can be joined together in the axial direction inside the steel pipe 20. In other words, the steel pipe 20 and the grout material 7 can cooperate to function as a joint for the axial reinforcing bars 10.

[0053] In the configuration of the present invention and the correspondence with the above-mentioned embodiment, the reinforced concrete structure of the present invention corresponds to the reinforced concrete structure 1, Similarly, The reinforced concrete member corresponds to column member 2, Concrete corresponds to Concrete 5, The axial reinforcement corresponds to axial reinforcement 10, The pipe body corresponds to steel pipe 20, Standard concrete members correspond to column members of standard cross-sectional structures, The range where bending load is large corresponds to the high load range H, The bending load range where bending cracks occur corresponds to load range H2. The grout material corresponds to grout material 7, The fiber reinforcement corresponds to a continuous fiber band 22, The reinforcing fibers correspond to the steel fibers 6, but the present invention is not limited to the configuration of the above-mentioned embodiment, and many other embodiments can be obtained.

[0054] For example, in the above description, the steel pipe 20 is fitted around each of the axial reinforcing bars 10, but multiple axial reinforcing bars 10 may be fitted around a steel pipe 20 together. In this case, since multiple axial reinforcing bars 10 can be fitted around a steel pipe 20 together compared to the case where a steel pipe 20 is fitted around each of the multiple axial reinforcing bars 10, the amount of work required for fitting the steel pipes 20 around them is reduced, allowing for efficient construction.

[0055] In the above description, all the steel pipes 20 are wrapped with the continuous fiber bands 22 together, but the continuous fiber bands 22 may be wrapped around each set of multiple steel pipes 20, or the continuous fiber bands 22 may be wrapped around the outer periphery of each steel pipe 20. In this case, the outer periphery of the steel pipes 20 can be restrained by the continuous fiber bands 22, so that the shear strength of the steel pipes 20 can be improved.

[0056] In addition, although the steel pipe 20 is wrapped around with a strip-shaped continuous fiber band 22, the same effect as that obtained by wrapping the continuous fiber band 22 can be obtained by wrapping a sheet-shaped continuous fiber sheet around the steel pipe 20.

[0057] Furthermore, in the above description, the steel pipes 20 are fitted around the axial reinforcing bars 10 in the high load range H in the column member 2, but the steel pipes 20 may be fitted around the axial reinforcing bars 10 of the deck slab member 3 or the beam member 4. For example, when the steel pipes 20 are fitted around the axial reinforcing bars 10 of the beam member 4, the high load range H is set in the beam member 4 in the vicinity of the joint between the beam member 4 and the column member 2. [Explanation of symbols]

[0058] 1. Reinforced concrete structure 2...Column member 5. Concrete 6…Steel fiber 7…Grout material 10...Axial reinforcement 20...Steel pipe 22...Continuous fiber band H: High load range H2…Load range

Claims

1. A reinforced concrete member constituting the column member of a reinforced concrete structure, the column member being configured to support the beam member and the horizontal deck member and beam member, and extending in the vertical direction between the deck member and the beam member, the reinforced concrete member comprising: The pillar member is Concrete, and axial reinforcing bars arranged inside the concrete; A tube of a predetermined length fitted around at least a portion of the axial direction of the axial reinforcing bar; a cap that provides a through hole penetrating the axial reinforcing bar, closes the upper end of the pipe body, and prevents the concrete from entering the inside of the pipe body, the cap being provided only on the upper end of the pipe body; The pipe body is disposed so that the lower end is located on the upper surface of the deck member. Reinforced concrete components.

2. The pipe body is fitted around a plurality of the axial reinforcing bars.

2. A reinforced concrete member according to claim 1.

3. A thin fiber reinforcing material is wound around the outer periphery of the tube. A reinforced concrete member according to claim 1 or 2.

4. Reinforcing fibers are mixed into the concrete surrounding the pipe. A reinforced concrete member according to any one of claims 1 to 3.

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