JP2015014097A - Reinforcement structure and construction method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure which can increase yield strength of a main reinforcement for a beam and which can reduce a cross-sectional area of the beam, and a construction method for the same.SOLUTION: A reinforcement structure 1 comprises a plurality of main reinforcements 21 for a beam 2, which are joined to a column 3. The main reinforcement 21 for the beam 2 comprises a high-strength reinforcement 211, a normal reinforcement 212, and a mechanical joint 213 for connecting an end of the high-strength reinforcement 211 and an end of the normal reinforcement 212 together. A yield point or 0.2% yield strength of the normal reinforcement 212 is specified by JIS G 3112. A yield point or 0.2% yield strength of the high-strength reinforcement 211 is greater than the yield point or 0.2% yield strength of the normal reinforcement 212.

Description

  The present invention relates to a reinforcing bar structure including a plurality of beam main bars to be joined to a beam, and a method for constructing the reinforcing bar structure.

Conventionally, a reinforcing bar structure including a column and a beam joined to the column is known.
In such a reinforcing bar structure, a column main beam and a shear reinforcement bar and a beam main bar are arranged at a column beam joint portion where the column and the beam are joined, and concrete is placed. According to the Reinforced Concrete Structural Calculation Standards / Explanation 8th Edition First Edition (edited by the Architectural Institute of Japan), joints are generally designed according to the allowable shearing force Q obtained from the following formula. is there.
Q = κ (f−0.5) bD (κ: coefficient depending on the shape of the joint, f: short-term allowable shear stress of concrete, b: effective width of the joint, D: column)

Furthermore, there exists a prior art example shown by patent document 1 as a reinforcing bar structure.
In the reinforcing bar structure shown in Patent Document 1, a main reinforcing bar for a beam includes a normal strength portion having a predetermined strength and a joint portion, and a high strength portion having a strength higher than the predetermined strength, and the normal strength portion is a beam. The main reinforcement bars are arranged at the center, and the high-strength parts are arranged at the joints with the beams. In such a main reinforcing bar for beams, the ends of the normal strength portions are joined together by joint means such as welding.

Utility Model Registration No. 3147699

However, in a rebar structure with a general design, in order to increase the allowable shear force (shear strength) of the joint part, the concrete strength can be increased by changing the material constituting the concrete, or it can be seen from the above formula As a result, the column D must be increased to increase the cross-sectional area of the joint. Also, the cross-sectional area of the joint can be increased by increasing the length of the beam.
Increasing the concrete strength is costly. Moreover, if the cross-sectional area of a junction part is enlarged, the cross-sectional area of the whole pillar and the whole beam will also become large, and living space will become narrow.
In Patent Document 1, the main bar is partially reinforced in order to solve the problem of reliably joining reinforcing bars whose strengths change, and it can be solved in Patent Document 1 that the living space is narrowed. is not.

  An object of the present invention is to provide a reinforcing bar structure capable of increasing the proof stress of the main reinforcing bar for the beam and reducing the cross-sectional area of the beam, and a method for constructing the reinforcing bar structure.

The reinforcing bar structure of the present invention includes a plurality of beam main bars joined to a column, and the yield point or 0.2% proof stress of at least a part of the main bars for the beam is the yield point of a normal reinforcing bar defined by JISG3112. Or it is characterized by being larger than 0.2% proof stress.
In the present invention of this configuration, the yield point or 0.2% yield strength of at least a part of the main bars for beams is larger than the yield point or 0.2% yield strength of ordinary reinforcing bars defined as steel bars for reinforced concrete in JIS G3112. At least a part of the main bars for the beam is high strength. For this reason, each main reinforcement for beams can be made thin and the space | interval of adjacent main reinforcements can be made small, and, thereby, the cross-sectional area of a beam can be made small.

In the present invention, the main reinforcing bars for the beams are a high-strength reinforcing bar as at least a part larger than the yield point or 0.2% proof stress of the normal reinforcing bar, the normal reinforcing bar, the end of the high-strength reinforcing bar, and the It is preferable to provide a mechanical joint that connects the ends of ordinary reinforcing bars.
A high strength reinforcing steel having a yield point or 0.2% proof stress of 490 to 1000 N / mm ² is used. Moreover, a yield strength or a 0.2% yield strength of 295-390 N / mm < ² > is used for a normal reinforcing bar.
In the present invention of this configuration, in addition to the above-described effects, the main bar is configured by connecting the end of the high-strength reinforcing bar and the end of the normal reinforcing bar with a mechanical joint. The high-strength reinforcing bar and the normal reinforcing bar can be managed separately. Therefore, at the time of construction of the reinforcing bar structure, it is possible to omit the previous configuration from the end of the high-strength reinforcing bar constituting the beam constituting unit. For this reason, the enlargement of the beam component unit can be prevented. Moreover, although it is difficult to weld a high-strength reinforcing bar and a normal reinforcing bar, in the present invention, since the high-strength reinforcing bar and the normal reinforcing bar are joined by a mechanical joint, the high-strength reinforcing bar and the normal reinforcing bar are firmly connected. it can. Therefore, operations such as formation, movement, and joining of the beam constituent units can be facilitated and construction workability can be improved.
Further, in the present invention with this configuration, since the main reinforcing bars for beams include high-strength reinforcing bars and ordinary reinforcing bars, the cost can be reduced compared with making all the main reinforcing bars high-strength.

  On the other hand, in Patent Document 1, an arbitrary portion of a normal strength main bar for a beam is strengthened by heat treatment. For this reason, the main reinforcement is formed by continuously connecting the normal strength portion and the high strength portion integrally. Such a main reinforcement is formed by extending a normal strength portion from an end portion of the high strength portion, and becomes long as a whole. Note that the lengths of the high-strength portion and the normal-strength portion are set based on predetermined conditions such as the strength of the reinforcing bar structure, and therefore the length of each portion cannot be shortened by ignoring the predetermined conditions. The reinforcing bar structure is constructed by joining a plurality of beam constituting units composed of a plurality of beam main bars and shear reinforcement bars to each other or to a column at a construction site. However, in Patent Document 1, since the main bar is long, the size of the beam constituent unit is increased, and there is a possibility that the formation, movement, and joining of the beam constituent unit become a large-scale work. As a result, it is difficult to improve construction workability. The problems described above can be solved by the present invention as described above.

In the present invention, a threaded portion is formed at each of the end portions of the high-strength reinforcing bars and the ordinary reinforcing bars, and the mechanical joint includes a coupler that is threadedly engaged with each of the threaded portions. It is preferable.
In the present invention having this configuration, the end of the high-strength reinforcing bar and the end of the normal reinforcing bar can be easily connected by screwing the high-strength reinforcing bar and the normal reinforcing bar into the coupler. For example, it can be connected as follows.
First, the coupler is rotated and screwed into either one of the high-strength reinforcing bar and the normal reinforcing bar, and then the other screwing part of the high-strength reinforcing bar and the normal reinforcing bar is connected to the one screwed part. Next, the coupler is reversely rotated to be screwed into the other screwing portion. In this way, the end of the high-strength reinforcing bar and the end of the normal reinforcing bar can be easily connected.
In addition, since the screwing length between the coupler and the threaded portion of the high-strength reinforcing bar and the normal reinforcing bar is adjustable, the axial positions of the high-strength reinforcing bar and the normal reinforcing bar can be adjusted many times. For this reason, even if there is a change in the axial dimension of the beam during construction, it can be handled by adjusting the screwing length.

In this invention, it is preferable that the said mechanical coupling is comprised with the grout type joint which connects the edge part of the said high intensity | strength reinforcing bar, and the edge part of the said normal reinforcement bar through a grout material.
Here, the grout type joint refers to a grout injection type joint provided with a sleeve and a grout material injected into the sleeve. In this grout-type joint, the end of the high-strength reinforcing bar and the end of the normal reinforcing bar are temporarily fixed by placing the end of the high-strength reinforcing bar and the end of the normal reinforcing bar on the sleeve and injecting grout material into the sleeve. Connect the ends.
In this invention of this structure, the setting freedom degree of the axial direction position of a high-strength reinforcing bar and a normal reinforcing bar can be widened. For this reason, even if there is a change in the axial dimension of the beam during construction, it can be handled. Further, the main fastening between the high-strength reinforcing bar and the normal reinforcing bar can be easily performed only by injecting the grout material.

In this invention, the said mechanical coupling is comprised by the lap | joint joint which connects the part with which the edge part of the said high-strength reinforcing bar and the edge part of the said normal reinforcement were piled up.
In the present invention having this configuration, a high-strength reinforcing bar and a normal reinforcing bar can be mechanically quickly connected. Moreover, even if there is a change in the axial dimension of the beam at the time of construction, it can be dealt with by adjusting the overlay amount.

In the present invention, it is preferable that the mechanical joint has a strength equal to or greater than that of the ordinary reinforcing bar.
In the present invention of this configuration, since the mechanical joint is a joint for ordinary reinforcing bars having a strength equal to or higher than that of ordinary reinforcing bars, when a tensile force acts on the main reinforcing bars, the base material of the ordinary reinforcing bars is finally obtained. Breakage can occur. For this reason, for example, when a high-strength rebar is placed at a beam-column joint with a large bending moment and a normal rebar is placed at the center between high-strength rebars with a small bending moment, the strength of the entire rebar structure is improved. Can be made.

In the present invention, it is preferable that the high-strength reinforcing bar includes a column beam joint portion to be joined to the column among the main bars for the beam.
In the present invention having this configuration, the high-strength reinforcing bar includes a column beam joint portion joined to a column. Since the stress applied to the beam concentrates in the beam-column joint, at least the beam-column joint of the main bars for the beam has high strength, and the proof stress of the beam at the beam-column joint can be improved.

In the present invention, the beam includes shear reinforcement bars for a plurality of beams arranged around a main bar for the beam in a plane intersecting the axial direction of the main bar for the beam, It is preferable that the yield point or 0.2% yield strength of the shear reinforcement is greater than the yield point or 0.2% yield strength of the ordinary reinforcing bar.
In the present invention of this configuration, since the yield point or 0.2% proof stress of the shear reinforcement for the beam is larger than the yield point or 0.2% proof strength of the normal reinforcing bar, the shear force that can be borne by the shear reinforcement is increased. Therefore, the burden on the concrete cross section of the beam can be reduced. Thereby, the cross-sectional area of the beam can be further reduced.

The method for constructing a reinforcing bar structure according to the present invention includes a plurality of main bars for beams to be joined to a column, and the main bars for the beams are a yield point or a yield point of a normal reinforcing bar defined by JIS G3112 or 0.2% proof stress. A method for constructing a reinforcing bar structure comprising a high-strength reinforcing bar greater than 0.2% proof stress, the normal reinforcing bar, and a mechanical joint connecting the end of the high-strength reinforcing bar and the end of the normal reinforcing bar. A plurality of the high-strength reinforcing bars and a column main bar are joined to form a beam constituent unit. After the beam constituent unit is arranged at a predetermined position on the site, the end of the normal reinforcing bar and the high-strength reinforcing bar The end portion is connected by the mechanical joint.
In the present invention of this configuration, in addition to the above-described operation and effect, a plurality of high-strength reinforcing bars that are connected to ordinary reinforcing bars by mechanical joints are arranged, and a main reinforcing bar for a column is joined thereto, thereby constituting a small beam constituent unit. it can. That is, since the beam constituent unit can be configured using a short high-strength reinforcing bar in which a normal reinforcing bar portion is not formed at the end, the beam constituent unit can be reduced in size. By downsizing the beam component unit, it is easy to move and place it on the construction site by crane or manpower. In addition, the high-strength reinforcing bar and the normal reinforcing bar can be firmly coupled by connecting the high-strength reinforcing bar and the normal reinforcing bar, which are difficult to weld to each other, with a mechanical joint. As a result, construction workability can be improved.

  The object of the present invention is to provide a reinforcing bar structure and a reinforcing bar construction method that can increase the proof stress of the main reinforcing bars for the beam, reduce the cross-sectional area of the beam, and improve the workability.

The schematic diagram which shows the whole reinforcing bar structure of this invention. Sectional drawing which shows the principal part of the reinforcing bar structure which concerns on embodiment of this invention. Schematic which shows the mechanical coupling which concerns on embodiment of this invention. Sectional drawing which shows the mechanical coupling which concerns on embodiment of this invention. Schematic explaining the connection procedure of each reinforcing bar which concerns on embodiment of this invention. It is the schematic which shows the mechanical coupling which concerns on the modification of this invention. It is the schematic which shows the grout type joint which concerns on the modification of this invention. It is the schematic which shows the lap joint which concerns on the modification of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing the entire rebar structure 1, FIG. 2 is a cross-sectional view of the main part of the rebar structure 1, and FIGS. 3A and 3B are schematic views showing a mechanical joint 213. FIG. 4 is a cross-sectional view showing the mechanical joint 213, and FIG. 5 is a schematic diagram for explaining a connection procedure of each reinforcing bar. In FIG. 2, a part of the column 3 (a part of the shear reinforcement bar 32 and a part of the main bar 31) is omitted for easy understanding of the reference numeral 200, but a part of the column 3 (the shear reinforcement bar 32, the main bar) is omitted. 31) is not cut off.

As shown in FIGS. 1 and 2, the building is a multi-storey reinforced concrete structure including a plurality of beams 2 and a plurality of columns 3 joined to the beams 2, and concrete 100 is placed on the reinforced structure 1. Has been.
As a form of joining between the beam 2 and the column 3, there are a cross-shaped joint S1, a toroidal joint S2, an L-shaped joint S3, and a T-shaped joint S4. In this embodiment, the beam-to-column joint of these joints S1 to S4 Applies to In the following description, the cruciform joint S1 will be described as an example.

  The beam 2 has a beam bar D0. The reinforcing bar structure 1 has a main bar 21 for a plurality of beams 2 extending in the vertical direction and arranged at equal intervals, and a plane intersecting the axial direction of the main bar 21 (FIG. 2). A plurality of shear reinforcement bars 22 for the beams 2 that are arranged at equal intervals around the main reinforcement 21 and reinforce the shear strength of the beams 2.

The main reinforcing bar 21 includes a high-strength reinforcing bar 211 whose yield point or 0.2% yield strength is greater than the yield point or 0.2% yield strength of a normal reinforcing bar (hereinafter simply referred to as a normal reinforcing bar) defined in JIS G3112, And a mechanical joint 213 for connecting the end of the high strength reinforcing bar 211 and the end of the normal reinforcing bar 212. Yield point or 0.2% proof stress of the high strength reinforcing bar 211 is 490MPa (N / mm ²⁾ or more 1000MPa (N / mm ²⁾ or less, for example 900MPa (N / mm ^2). The yield point or 0.2% yield strength of the normal reinforcing bar 212 is 295 MPa (N / mm ² ) or more and 390 MPa (N / mm ² ) or less, for example, 390 MPa (N / mm ² ). Further, the main reinforcement 21 may be round steel or deformed steel bar.

  The high-strength reinforcing bar 211 includes the column beam joint portion 200 that is a joint portion between the beam 2 and the column 3, and the one region 201 on one side in the horizontal direction from the column beam joint portion 200 and the horizontal direction from the column beam joint portion 200. It extends to the other region 202 on the other side. On the other hand, the distance T1 between one end of the region 201 and the other end of the beam-column joint 200 is about 1.1 to 1.3 times the beam D0 (T1≈D0 × 1.1). ~ D0x1.3). Similarly, the distance T2 between one end of the other region 202 and the other end of the beam-column joint 200 is approximately 1.1 to 1.3 times the beam D0 (T2≈D0 × 1.1-D0 × 1.3). The distances T1 and T2 are the yield point or 0.2% proof stress of the high strength reinforcing bar 211 and the yield point of the normal reinforcing bar 212 or 0. It is obtained from the ratio with 2% yield strength.

As shown in FIG. 4, the high-strength reinforcing bar 211 includes a reinforcing bar main body 211A that extends in the horizontal direction, and male screw portions 211B that serve as screwing portions formed at both ends of the reinforcing bar main body 211A in the horizontal direction. The axial length of the male screw portion 211B is equal to or greater than the axial length of a coupler body 213B described later.
Such a high-strength reinforcing bar 211 is formed by passing a normal reinforcing bar as a base material of the main reinforcing bar 21 through a heating coil (not shown) and quenching the whole.

  As shown in FIG. 4, the normal reinforcing bars 212 are arranged in series on the same axis as the high-strength reinforcing bars 211. The normal reinforcing bar 212 includes a reinforcing bar main body 212A extending in the horizontal direction and male screw portions 212B as screwing portions respectively formed at both ends in the horizontal direction of the reinforcing bar main body 212A. The axial length of the male screw portion 212B is at least half of the axial length of a coupler main body 213B described later. The male thread 212B has the same threading direction as the male thread 211B.

The mechanical joint 213 includes a coupler 213A having a hexagonal cross section that is disposed where the male screw portions 211B and 212B are close to each other in the horizontal direction.
As shown in FIG. 3, the coupler 213A includes a cylindrical coupler body 213B, a through hole 213C defined in the inner peripheral surface of the coupler main body 213B, and a female screw portion 213D formed in the inner peripheral surface of the coupler main body 213B. Consists of.
The coupler 213A has a strength higher than that of the ordinary reinforcing bar 212. Male screw portions 211B and 212B are arranged in the through-hole 213C, and the female screw portion 213D is screwed with the male screw portions 211B and 212B. By this screwing, the mechanical joint 213 mechanically connects the end of the high strength reinforcing bar 211 and the end of the normal reinforcing bar 212.

The shear reinforcement 22 is a yield point of ordinary rebar or a Urbon 1275 having a yield point greater than 0.2% proof stress (390 MPa) or 0.2% proof stress (900 MPa) (trade name of high frequency thermal smelting Co., Ltd.). is there.
The shear reinforcement bars 22 are arranged in the direction in which the main bars 21 extend, including the column beam joint portion 200.

  The reinforcing bar structure 1 constituting the pillar 3 includes a main bar 31 for a plurality of pillars 3 extending in a vertical direction and arranged at a predetermined interval, and a plane intersecting the axial direction of the main bar 31 (perpendicular to the paper surface in FIG. 2). A plurality of shear reinforcement bars 32 for a plurality of pillars 3 that are arranged in the extending direction of the principal bars 31 at equal intervals so as to surround the principal bars 31 in the inner plane) and reinforce the shear strength of the pillars 3. The main reinforcing bar 31 and the shear reinforcing bar 32 are ordinary reinforcing bars.

Hereinafter, the construction method of the reinforcing bar structure 1 will be described.
First, a plurality of high-strength reinforcing bars 211 are arranged at equal intervals while extending in the horizontal direction, and the plurality of high-strength reinforcing bars 211 are surrounded by a plurality of shear reinforcement bars 22. The plurality of shear reinforcement bars 22 are arranged at equal intervals in the horizontal direction. Thereby, a plurality of high-strength beam constituent units are formed.
On the other hand, a plurality of ordinary reinforcing bars 212 are arranged at equal intervals in a state of extending in the horizontal direction, and the plurality of ordinary reinforcing bars 212 are surrounded by a plurality of shear reinforcing bars 22. The plurality of shear reinforcement bars 22 are also arranged at equal intervals in the horizontal direction. As a result, a plurality of ordinary strength beam constituent units are formed.
Each such beam constituent unit can be formed before being brought into the construction site, but is not limited thereto, and can be formed at the construction site.

Next, the mechanical joint 213 is connected to both ends of the high-strength reinforcing bar 211, respectively.
Specifically, first, one end of the coupler 213A is brought into contact with the tip of the male screw portion 211B of the high-strength reinforcing bar 211. Subsequently, the coupler 213A is rotated so that the female screw portion 213D is screwed into the male screw portion 211B. The rotation continues and the male screw portion 211B is inserted into the through-hole 213C, and the tip of the male screw portion 211B reaches the other end of the coupler 213A (see FIG. 5). At this time, the tip of the male screw portion 211B protrudes from the other end of the coupler 213A.
In addition, even if it does not carry out to the protrusion mentioned above, it should just be in the position which the front-end | tip of the external thread part 211B can face the front-end | tip of the external thread part 212B, for example, you may make it flush with the said other end.

Next, each beam constituent unit is arranged at a predetermined position on the construction site.
The reinforcing bar main body 211A of the high-strength reinforcing bar 211 is bonded to the beam 2 to form the high-strength column-beam connecting part 200. Further, the high-strength reinforcing bar 211 and the normal reinforcing bar 212 are respectively arranged in series on the same axis in the horizontal direction.

Next, the high-strength reinforcing bar 211 and the normal reinforcing bar 212 are connected.
Specifically, first, the end surface 211C of the front end of the male threaded portion 211B of the high-strength reinforcing bar 211 is opposed to the end surface 212C of the front end of the male threaded portion 212B of the ordinary reinforcing bar 212, and these end surfaces 211C and 212C are brought into contact with each other. Subsequently, the coupler 213A that is screwed into the male screw portion 211B is reversely rotated, and the female screw portion 213D is screwed into the male screw portion 212B.

In this way, the high-strength reinforcing bar 211 and the normal reinforcing bar 212 are connected by screwing the female screw part 213D into the male screw parts 211B and 212B by rotating and reversely rotating the coupler 213A.
Thereby, even if it does not rotate the high intensity | strength reinforcing bar 211 and the normal reinforcing bar 212, these can be mutually connected and the connection of each beam structural unit can be performed easily.
As described above, the construction of the reinforcing bar structure 1 is performed. In addition, it becomes a steel frame structure by placing the concrete 100 in the reinforcing bar structure 1 constructed in this way.

In the present embodiment, the following operational effects can be achieved.
(1) In the reinforcing bar structure 1 of the present embodiment, the yield point or 0.2% proof stress of the high-strength reinforcing bar 211 is larger than the yield point or 0.2% proof strength of the normal reinforcing bar. The portion composed of the strength reinforcing bars 211 is high strength. For this reason, each main reinforcement 21 for the beam 2 can be made thin and the space | interval of the adjacent main reinforcements 21 can be made small, and, thereby, the cross-sectional area of the beam 2 can be made small.

(2) Since the main reinforcing bar 21 for the beam 2 includes the high-strength reinforcing bar 211 and the normal reinforcing bar 212, the cost can be reduced compared with making the entire part of the main reinforcing bar 21 high-strength.

(3) Since the main reinforcing bar 21 is configured by connecting the end of the high-strength reinforcing bar 211 and the end of the normal reinforcing bar 212 with the mechanical joint 213, the high bar constituting the beam constituting unit at the time of constructing the reinforcing bar structure 1. The previous configuration can be omitted from the end of the strength reinforcing bar 211. For this reason, the enlargement of the beam component unit can be prevented. Moreover, although it is difficult to weld the high-strength reinforcing bar 211 and the normal reinforcing bar 212, in the present embodiment, since these are connected by the mechanical joint 213, the high-strength reinforcing bar 211 and the normal reinforcing bar 212 can be firmly coupled. Therefore, operations such as formation, movement, and joining of the beam constituent units can be facilitated and construction workability can be improved.

(4) The end portions of the high-strength reinforcing bar 211 and the end portions of the normal reinforcing bar 212 can be easily connected to the coupler 213A by screwing the male screw portions 211B and 212B as the screwed portions of the high-strength reinforcing bar 211 and the normal reinforcing bar 212, respectively. Can be connected to. Further, since the screwing length between the coupler 213A and the male threaded portions 211B and 212B of the high-strength reinforcing bar 211 and the normal reinforcing bar 212 can be adjusted, the mutual axial position of the high-strength reinforcing bar 211 and the normal reinforcing bar 212 can be adjusted several times. Can also be adjusted. For this reason, even if there is a change in the axial dimension of the beam 2 during construction, it can be handled by adjusting the screwing length.

(5) Since the mechanical joint 213 is a joint for ordinary reinforcing bars having strength higher than that of the ordinary reinforcing bar 212, when a tensile force is applied to the main reinforcing bar 21, the base material of the ordinary reinforcing bar 212 is finally broken. Can be generated. For this reason, for example, when the high-strength reinforcing bar 211 is arranged at the beam-column joint 200 having a large bending moment and the normal reinforcing bar 212 is arranged at the center between the high-strength reinforcing bars 211 having a small bending moment, the reinforcing bar structure 1 The overall yield strength can be improved.

(6) Since the yield point or 0.2% proof stress of the shear reinforcement 22 for the beam 2 is larger than the yield point or 0.2% proof stress of the normal reinforcing bar, the shear force that the shear reinforcement 22 can bear is large. Therefore, the share of the concrete cross section of the beam 2 can be reduced accordingly. Thereby, the cross-sectional area of the beam 2 can be further reduced.

(7) The high-strength reinforcing bar 211 includes the beam-column joint 200. Since the stress applied to the beam 2 concentrates at the beam-column joint 200, at least the beam-column joint 200 of the main reinforcement 21 for the beam 2 has high strength, and the proof stress of the beam 2 at the beam-column joint 200 is improved. it can.

(8) In the construction method of the reinforcing bar structure 1 described above, a plurality of high-strength reinforcing bars 211 that are connected to the normal reinforcing bar 212 by the mechanical joint 213 are arranged in addition to the operation and effect of the reinforcing bar structure 1 described above. By joining 31, a small columnar unit can be configured. That is, since the beam constituent unit can be configured using the short high strength reinforcing bar 211 in which the normal reinforcing bar portion is not formed at the end, the beam constituent unit can be reduced in size. By downsizing the beam component unit, it is easy to move and place it on the construction site by crane or manpower. In addition, the high-strength reinforcing bar 211 and the normal reinforcing bar 212 can be firmly coupled to each other by connecting the high-strength reinforcing bar 211 and the normal reinforcing bar 212 that are difficult to weld to each other by the mechanical joint 213. As a result, construction workability can be improved.

  It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  In the above-described embodiment, the coupler 213A has a strength higher than that of the ordinary reinforcing bar 212. However, the coupler 213A is not limited to this, and when a tensile force acts on the main reinforcing bar 21, the base material of the ordinary reinforcing bar 212 is finally obtained. What is necessary is just to make a fracture occur. Therefore, for example, the coupler 213 </ b> A may have a strength equivalent to that of the normal reinforcing bar 212.

  In the embodiment, the mechanical joint 213 includes the coupler 213A. In addition to this configuration, the mechanical joint 213 further includes at least one lock nut 214 that is screwed into at least one of the male screw portions 211B and 212B. It may be. For example, as shown in FIG. 6, you may provide the lock nut 214 screwed together in the external thread part 211B. The lock nut 214 prevents the coupler 213A from rotating.

  In the above-described embodiment, the coupler 213A has a hexagonal cross section as shown in FIG. 3B, but is not limited to this. For example, the coupler 213A may be a polygonal cross section other than a circular cross section or a hexagonal cross section. Good.

  In the above-described embodiment, the distal ends of the male screw portions 211B and 212B face each other and come into contact with each other, but in addition to this configuration, an engagement means for engaging both the distal ends may be provided. The engaging means includes, for example, an engaging convex portion formed at one tip of the male screw portions 211B and 212B and an engaging concave portion formed at the other tip of the male screw portions 211B and 212B. . For this reason, when the front-end | tip of external thread part 211B and 212B mutually contact | abut, an engagement convex part and an engagement recessed part can be engaged, and, thereby, mutual connection of the high intensity | strength reinforcing bar 211 and the normal reinforcing bar 212 is possible. Can be easily positioned.

  In the above-described embodiment, the coupler 213A is connected to the high-strength reinforcing bar 211 by the previous rotation and connected to the normal reinforcing bar 212 by the subsequent reverse rotation. However, the present invention is not limited to this, and conversely, the coupler 213A is connected to the normal reinforcing bar 212 first. Then, it may be connected to the high-strength reinforcing bar 211 later. In this case, the axial length of the male threaded portion 211B of the high-strength reinforcing bar 211 may be at least half the axial length of the coupler main body 213B, and the axial length of the male threaded portion 212B of the ordinary reinforcing bar 212 is equal to the coupler main body. It may be equal to or longer than the axial length of 213B.

  In the embodiment, the end surface 211C of the high-strength reinforcing bar 211 and the end surface 212C of the normal reinforcing bar 212 are in contact with each other. However, the present invention is not limited to this. For example, the end surfaces 211C and 212C may be separated from each other.

In the embodiment, the mechanical joint 213 includes the coupler 213A that connects the end of the high-strength reinforcing bar 211 and the end of the normal reinforcing bar 212 by screwing, but is not limited thereto. 7, a grout joint 216 connected via a grout material 215 may be used. The grout joint 216 includes a sleeve 217 and a grout material 215 to be injected into the sleeve 217.
The reinforcing bars connected to each other by the grout-type joint 216 may be constituted by, for example, a high-strength reinforcing bar 218 and a normal reinforcing bar 219 formed as deformed reinforcing bars instead of the high-strength reinforcing bar 211 and the normal reinforcing bar 212 described above. The high-strength reinforcing bar 218 and the normal reinforcing bar 219 may be provided with a mark portion 220 marked to indicate the amount of insertion into the sleeve 217.
The grout joint 216 may have a strength equal to or higher than that of the normal reinforcing bar 219.

  The sleeve 217 includes a cylindrical sleeve body 217A and annular seals 217B provided at both axial ends of the sleeve body 217A. A screw hole and an injection port (not shown) are formed in the sleeve body 217A. A set screw 217 </ b> C that presses the high-strength reinforcing bar 218 and the normal reinforcing bar 219 at the tip and temporarily fixes them is screwed into the screw hole. Grout material 215 is injected from the inlet.

The connection between the high-strength reinforcing bar 218 and the normal reinforcing bar 219 using the grout-type joint 216 is performed as follows, for example.
First, one of the end of the high-strength reinforcing bar 218 and the end of the normal reinforcing bar 219 is inserted from one end of the sleeve main body 217A, and temporarily fixed by a set screw 217C at a predetermined position. Next, either one of the end of the high-strength reinforcing bar 218 and the end of the normal reinforcing bar 219 is inserted from the other end of the sleeve main body 217A, and temporarily fixed by a set screw 217C at a predetermined position. Next, the grout material 215 is injected from the injection port to fill the sleeve body 217A.
In this way, the end of the high strength reinforcing bar 218 and the end of the normal reinforcing bar 219 are connected.
Thereby, the setting freedom degree of the axial direction position of the high-strength reinforcing bar 218 and the normal reinforcing bar 219 can be widened, and it is possible to cope with a change in the axial dimension of the beam 2 during construction. Further, the main fastening of the high-strength reinforcing bar 218 and the normal reinforcing bar 219 can be easily performed only by injecting the grout material 215.

In the embodiment, the high-strength reinforcing bar 211 and the normal reinforcing bar 212 are connected by the coupler 213A, but the present invention is not limited to this. For example, as shown in FIG. 8, the end of the high strength reinforcing bar 211 and the end of the normal reinforcing bar 212 are overlapped in a direction intersecting the axial direction of the main reinforcing bar 21, and the overlapped portions are mechanically connected by a lap joint 300. May be. The lap joint 300 is connected by winding a wire 301 such as a wire around the overlapped portion. When the lap joint 300 is employed, the male screw portions 211B and 212B may not be formed at the end portion of the high-strength reinforcing bar 211 and the end portion of the normal reinforcing bar 212.
Thereby, the high-strength reinforcing bar 211 and the normal reinforcing bar 212 can be mechanically quickly connected. Further, even if there is a change in the axial dimension of the beam 2 at the time of construction, it can be dealt with by adjusting the overlapping amount.

  Moreover, in the said embodiment, although the normal rebar 212 with the whole normal intensity | strength is provided, it is not limited to this. For example, you may provide the normal reinforcing bar which has the high intensity | strength part which one part (edge part etc.) strengthened by hardening etc ..

  In the above-described embodiment, the high-strength column constituting unit is configured by surrounding the plurality of high-strength reinforcing bars 211 with the plurality of shear reinforcing bars 22 to form the reinforcing bar rods, but is not limited thereto. For example, a plurality of high-strength reinforcing bars 211 are surrounded by a plurality of shear reinforcement bars 22 to form a reinforcing bar bar, and concrete is placed on the reinforcing bar bar to form precast concrete, thereby forming a high-strength column constituting unit. May be.

  INDUSTRIAL APPLICABILITY The present invention can be used as a reinforcing bar structure including a plurality of main bars for beams to be joined to a column and a construction method of the reinforcing bar structure.

  DESCRIPTION OF SYMBOLS 1 ... Reinforcement structure, 2 ... Beam, 3 ... Column, 21 ... Main reinforcement, 211, 218 ... High-strength reinforcement, 212, 219 ... Normal reinforcement, 211B, 212B ... Male thread part, 213 ... Mechanical joint, 213A ... Coupler, 213D ... Female thread part, 216 ... Grout type joint, 22 ... Shear reinforcement, 200 ... Column beam joint part, 300 ... Lap joint, 301 ... Wire rod.

Claims (9)

  A plurality of main bars for beams to be joined to a column, and the yield point or 0.2% proof stress of at least a part of the main bars for the beam is higher than the yield point or 0.2% proof stress of a normal reinforcing bar defined in JIS G3112. Reinforcing bar structure characterized by being large. The reinforcing bar structure according to claim 1, wherein the main reinforcing bar for the beam is a high strength reinforcing bar as at least a part larger than a yield point of the normal reinforcing bar or a 0.2% proof stress, the normal reinforcing bar, and the high strength reinforcing bar. A reinforcing bar structure comprising: a mechanical joint that connects the end of the steel bar and the end of the normal reinforcing bar. In the reinforcing bar structure according to claim 2,
At the end of the high-strength reinforcing bar and the end of the normal reinforcing bar, threaded portions are respectively formed,
The mechanical joint includes a coupler that is screwed into each of the screwing portions. In the reinforcing bar structure according to claim 2,
The mechanical joint is constituted by a grout joint that connects an end portion of the high-strength reinforcing bar and an end portion of the normal reinforcing bar through a grout material. In the reinforcing bar structure according to claim 2,
The mechanical joint is configured by a lap joint that connects portions where the end portions of the high-strength reinforcing bars and the end portions of the normal reinforcing bars are overlapped. In the reinforcing bar structure according to any one of claims 2 to 4,
The mechanical joint has a strength equal to or greater than that of the ordinary reinforcing bar. In the reinforcing bar structure according to any one of claims 2 to 6,
The high-strength reinforcing bar includes a beam-to-column connection portion to be bonded to the column among the main reinforcing bars for the beam. In the reinforcing bar structure according to any one of claims 1 to 7,
The beam includes a plurality of beam shear reinforcing bars arranged around the beam main bars in a plane intersecting the axial direction of the beam main bars, and the plurality of beam shear reinforcing bars. The yield point or 0.2% yield strength of the steel bar is greater than the yield point or 0.2% yield strength of the ordinary reinforcing bar. It has a main bar for multiple beams joined to the column,
The main reinforcing bars for the beam include a yield point or a high-strength reinforcing bar whose 0.2% proof stress is greater than the yield point or 0.2% proof strength of a normal reinforcing bar specified by JISG3112, the normal reinforcing bar, and the end of the high-strength reinforcing bar Is a method for constructing a reinforcing bar structure comprising a mechanical joint for connecting a portion and an end of the normal reinforcing bar,
A plurality of the high-strength reinforcing bars are arranged and the main bars for columns are joined to form a beam constituting unit,
After placing this beam component unit in place on site,
The construction method of the reinforcing bar structure characterized by connecting the end of the ordinary reinforcing bar and the end of the high-strength reinforcing bar with the mechanical joint.

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