JP6266200B2 - Reinforcing bar structure and reinforced concrete member using the same - Google Patents

Description

  The present invention relates to a reinforcing bar structure used for a column or a beam and a reinforced concrete member using the same.

  Conventionally, in a reinforced concrete member having a plurality of main bars extending in the axial direction and a plurality of shear reinforcing bars surrounding the main bars to reinforce the shear strength, there is a difference in the amount of main bars at the end of the material and the amount of main bars at the center. In this case, it is conceivable that the main bars are arranged over the entire length of the material so that the main bars do not slip out from the inside of the reinforced concrete member even if the main bars are subjected to bending tension. However, the amount of the main bars increases, a part for joining the main bars is separately required, and the joining work of joining the main bars also increases. On the other hand, it is possible to increase the amount of shear reinforcement to increase the bond strength between the main reinforcement and concrete so as to suppress slippage of the main reinforcement, but the amount of shear reinforcement increases and the reinforcement work of the shear reinforcement Will also increase.

Therefore, it is conceivable to use an adhesion reinforcing bar in addition to the shear reinforcing bar. As a reinforcing bar structure having an adhesive reinforcing bar, a reinforcing bar structure including a main reinforcing bar, a shear reinforcing bar, and an adhesive reinforcing bar provided adjacent to the shear reinforcing bar is known (Patent Document 1).
In the reinforcing bar structure shown in Patent Document 1, one main reinforcing bar is surrounded by one adhesion reinforcing bar, or a plurality of main reinforcing bars arranged on the inner side of the main reinforcing bar arranged on the outermost periphery are one. Surrounded by adhesive reinforcement.

Japanese Patent No. 4151245

  However, in the conventional reinforcing bar structure as described in Patent Document 1, one main bar is surrounded by one adhesion reinforcing bar, or a plurality of main bars are surrounded by one adhesion reinforcing bar. Since the main reinforcing bar arranged at the outermost periphery in the reinforcing bar structure is not surrounded by the adhesion reinforcing bar, there is a limit to sufficiently reinforcing the outermost peripheral side of the reinforcing bar structure to which the shearing force is applied most.

  An object of the present invention is to provide a reinforced structure that can reinforce the outermost peripheral side to which shearing force is most applied and a reinforced concrete member using the same.

The reinforcing bar structure of the present invention includes a plurality of main reinforcing bars extending in the axial direction, a plurality of shear reinforcing bars arranged in a rectangular shape in a plane intersecting the axial direction of the main reinforcing bars, and arranged around the main reinforcing bars, An adhesive reinforcing bar provided adjacent to the shear reinforcing bar in the axial direction, wherein the main bar is a first main bar, a second main bar, a third main bar, which are arranged clockwise in at least four corners of the shear reinforcing bar. Between the main and fourth main muscles, the fifth main muscle provided adjacent to the first main muscle between the first main muscle and the second main muscle, and between the first main muscle and the second main muscle A sixth principal muscle provided adjacent to the second principal muscle, a seventh principal muscle provided between the third principal muscle and the fourth principal muscle and adjacent to the third principal muscle; Provided between the third and fourth main bars and adjacent to the fourth main bar Yes and eighth main reinforcement that is, the ninth main reinforcement which is provided between the first main reinforcement and the fourth main reinforcement, a tenth main reinforcement which is provided between the second main reinforcement and the third main reinforcement The adhesion reinforcing bar surrounds at least the first main bar and the fourth main bar, the inner circumference contacts the fifth main bar and the eighth main bar, and the first main bar contacts the ninth main bar. An adhesion reinforcing bar, a second adhesion reinforcing bar that surrounds at least the second and third principal bars, has an inner periphery that contacts the sixth and seventh principal bars, and that contacts the tenth principal bar; It is characterized by having .

In the present invention having this configuration, the adhesion reinforcing bar has the first adhesion reinforcing bar that surrounds at least the first main bar and the fourth main bar and the inner circumference abuts on the fifth main bar and the eighth main bar. The outermost end side of the reinforcing bar structure that is applied most can be concentrated and reinforced.
Further, in the present invention having this configuration, the adhesion reinforcing bars include the second adhesion reinforcing bars that surround at least the second principal muscle and the third principal muscle and whose inner circumferences abut against the sixth principal muscle and the seventh principal muscle. The outer peripheral end side of the reinforcing bar structure where the force is most applied can be reinforced more concentratedly.

In the present invention, the adhesion reinforcing bar includes a U-shaped part having a pair of bent parts bent from both ends of a back part extending in a direction orthogonal to the axial direction of the main bar, and the bent part from the tip of the bent part. A pair of feet extending in the axial direction, wherein the U-shaped portion faces at least the first principal muscle, the ninth principal muscle, and the fourth principal muscle, and the distal end of the foot portion is the first A configuration that does not reach an intermediate position between the main muscle and the second main muscle and an intermediate position between the third main muscle and the fourth main muscle is preferable.

  In the present invention having this configuration, the adhesion reinforcing bar includes a pair of feet extending from the tip of the bent portion in the axial direction of the bent portion, and the tip of the foot has an intermediate position between the first main bar and the second main bar, and It does not reach an intermediate position between the third and fourth main bars. For this reason, it becomes easy to install an adhesion reinforcing bar at the time of construction of a reinforcing bar structure.

In the present invention, the adhesion reinforcing bar has a U-shaped part having a pair of bent parts bent from both ends of a back part extending in a direction perpendicular to the axial direction of the main bar, and a base end connected to the bent part. And a pair of feet bent in the direction in which the tips are close to each other, the U-shaped portion facing at least the first principal muscle, the ninth principal muscle, and the fourth principal muscle, It is preferable that the tip does not reach an intermediate position between the first main muscle and the second main muscle and an intermediate position between the third main muscle and the fourth main muscle.

  In the present invention having this configuration, the adhesion reinforcing bar includes a pair of foot portions whose proximal ends are connected to the bent portions and the distal ends are bent in directions close to each other, and the distal ends of the foot portions are the first main muscle and the second main muscle. It does not reach an intermediate position between the main muscle and an intermediate position between the third and fourth main muscles. For this reason, it becomes difficult for the adhesion reinforcing bars to come off from inside the reinforcing bar structure. Moreover, it becomes easy to install an adhesion reinforcement bar at the time of construction of a reinforcing bar structure.

The reinforced concrete member of the present invention is characterized in that the above-mentioned reinforcing bar structure is embedded inside.
In this invention of this structure, since the said reinforcing bar structure is embed | buried inside, it can concentrate and reinforce the outer peripheral edge part side of the reinforced concrete member to which a shear force is most applied.

The side view which shows the reinforced concrete member which concerns on 1st Embodiment of this invention. Sectional drawing in the II-II line of FIG. The top view which shows the adhesion reinforcing bar which concerns on 1st Embodiment of this invention. The side view which shows the reinforced concrete member which concerns on 2nd Embodiment of this invention. Sectional drawing in the VV line | wire of FIG. The top view which shows the adhesion reinforcing bar which concerns on 2nd Embodiment of this invention.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
In each embodiment, the same reference numerals are given to the same components, and descriptions thereof are omitted or simplified.

<First Embodiment>
1 is a side view of the reinforced concrete member 10, FIG. 2 is a cross-sectional view of the reinforced concrete member 10, and FIG.
The reinforced concrete member 10 includes a reinforced structure 1 and a concrete 5 in which the reinforced structure 1 is embedded.

  The reinforcing bar structure 1 has a plurality of main reinforcing bars 2 extending in the axial direction (left and right direction in FIG. 1) and a rectangular shape in a plane intersecting the axial direction of the main reinforcing bars 2 (a plane parallel to the paper in FIG. 2). And a plurality of shear reinforcing bars 3 that reinforce the shear strength of the reinforcing bar structure 1, and an adhesion reinforcing bar 4 that is provided so as to overlap the shear reinforcing bar 3 in the axial direction of the main bar 2.

The main muscle 2 has a first main muscle 21A to a ninth main muscle 21I, a tenth main muscle 21L, an eleventh main muscle 21K, and a twelfth main muscle 21J arranged on the outer peripheral side (the upper end side and the lower end side in FIG. 2). In the present embodiment, six main bars 2 are arranged on each of the upper end side and the lower end side in FIG.
The first main bar 21 </ b> A to the fourth main bar 21 </ b> D are arranged clockwise at the four corners of the shear reinforcing bar 3.
The fifth major muscle 21E is provided between the first major muscle 21A and the second major muscle 21B and adjacent to the first major muscle 21A, and the sixth major muscle 21F is between the first major muscle 21A and the second major muscle 21B. And it is provided adjacent to the second main muscle 21B.

The seventh major muscle 21G is provided between the third major muscle 21C and the fourth major muscle 21D and adjacent to the third major muscle 21C, and the eighth major muscle 21H is between the third major muscle 21C and the fourth major muscle 21D. However, it is provided adjacent to the fourth main muscle 21D.
The ninth principal muscle 21I is provided between the first principal muscle 21A and the fourth principal muscle 21D, and the twelfth principal muscle 21J is provided between the fifth principal muscle 21E and the eighth principal muscle 21H. The eleventh principal muscle 21K is provided between the sixth principal muscle 21F and the seventh principal muscle 21G, and the tenth principal muscle 21L is provided between the second principal muscle 21B and the third principal muscle 21C.

As shown in FIG. 1, the shear reinforcing bars 3 are arranged side by side at substantially equal intervals in the axial direction of the main bars 2. Each shear reinforcement 3 is formed from a high-strength steel bar or the like and has a hoop shape.
As shown in FIG. 2, the shear reinforcing bar 3 contacts the first main bar 21 </ b> A to the ninth main bar 21 </ b> I and the tenth main bar 21 </ b> L. Thereby, the shear reinforcement bar 3 surrounds all the main bars 21A to 21L. In the present embodiment, each shear reinforcing bar 3 has a pair of arms 31 extending inward at the upper right corner portion in FIG. 2, and a curved surface portion of the upper right corner portion of the shear reinforcing bar 3. The pair of arm portions 31 surrounds the first main muscle 21A.

The adhesion reinforcing bars 4 are made of low-strength steel or the like, and are provided in pairs corresponding to one shear reinforcing bar 3. The first reinforcing reinforcement 4 A provided on the upper side in FIG. 2 and the lower in FIG. 2. And a second adhesion reinforcing bar 4B provided on the side. The first adhesion reinforcing bar 4A and the second adhesion reinforcing bar 4B have a U-shape in which one end side is opened, and the open portions are opposed to each other.
The first adhesion reinforcing bar 4A has a U-shaped part having a back part 41 extending in a direction orthogonal to the axial direction of the main bar 2 (left and right direction in FIG. 2) and a pair of bent parts 42 bent from both ends of the back part 41. 43 and a pair of feet 44 extending from the tip of the bent portion 42 in the axial direction of the bent portion 42 (the axial direction in FIG. 2).

The back portion 41 contacts the first main muscle 21A, the fourth main muscle 21D, and the ninth main muscle 21I, and the bent portion 42 contacts the first main muscle 21A, the fifth main muscle 21E, the fourth main muscle 21D, and the eighth main muscle 21H. . Therefore, the U-shaped portion 43 is in contact with the first main muscle 21A and the fourth main muscle 21D.
The foot portion 44 abuts on the fifth principal muscle 21E and the eighth principal muscle 21H, and extends in the axial direction of the bent portion 42 from the abutting fifth principal muscle 21E and the eighth principal muscle 21H. The pair of foot portions 44 are parallel to each other. However, the tip of the foot 44 does not reach an intermediate position between the first main muscle 21A and the second main muscle 21B and an intermediate position between the third main muscle 21C and the fourth main muscle 21D.

  The first attached reinforcing bar 4A surrounds the first main reinforcing bar 21A and the fourth main reinforcing bar 21D, and the inner circumference of the first attached reinforcing bar 4A is in contact with the fifth main reinforcing bar 21E and the eighth main reinforcing bar 21H.

The second adhesion reinforcing bar 4B has the same structure as that of the first adhesion reinforcing bar 4A, the back part 41 abuts on the second principal muscle 21B, the third principal muscle 21C, and the tenth principal muscle 21L, and the bent part 42 has the second structure. The main muscle 21B and the sixth main muscle 21F come into contact with the third main muscle 21C and the seventh main muscle 21G. Therefore, the U-shaped portion 43 is in contact with the second main muscle 21B and the third main muscle 21C.

The foot portion 44 abuts on the sixth principal muscle 21F and the seventh principal muscle 21G, and extends toward the axial direction of the bent portion 42 from the abutting sixth principal muscle 21F and the seventh principal muscle 21G. The tip of the foot 44 does not reach an intermediate position between the first main muscle 21A and the second main muscle 21B and an intermediate position between the third main muscle 21C and the fourth main muscle 21D.
The second adhesion reinforcing bar 4B surrounds the second principal muscle 21B and the third principal muscle 21C, and the inner circumference of the second adhesion reinforcing bar 4B is in contact with the sixth principal muscle 21F and the seventh principal muscle 21G.

Therefore, in this embodiment, the following effects can be obtained.
(1) In the reinforcing bar structure 1 of the present embodiment, the adhesion reinforcing bar 4 surrounds the first main bar 21A and the fourth main bar 21D, and the first peripheral part abuts on the fifth main bar 21E and the eighth main bar 21H. Since it has the adhesion reinforcing bar 4A, the outer peripheral end side of the reinforcing bar structure 1 to which the shearing force is applied most can be concentrated and reinforced.

(2) Further, the adhesion reinforcing bar 4 includes a pair of foot portions 44 extending from the tip of the bent portion 42 in the axial direction of the bent portion 42, and the tip of the foot portion 44 includes the first main bar 21 </ b> A and the second main bar 21 </ b> B. The intermediate position between the third main bar 21C and the fourth main bar 21D is not reached. For this reason, it becomes easy to install the adhesion reinforcing bar 4 at the time of construction of the reinforcing bar structure 1.

(3) Further, the adhesion reinforcing bar 4 has the second adhesion reinforcing bar 4B that surrounds the second main bar 21B and the third main bar 21C and whose inner peripheral part abuts on the sixth main bar 21F and the seventh main bar 21G. Further, the outer peripheral end portion side of the reinforcing bar structure 1 to which the shearing force is most applied can be reinforced more strongly.

(4) In the reinforced concrete member 10 of this embodiment, since the reinforced structure 1 is embed | buried inside, it can concentrate and reinforce the outer peripheral edge part side of the reinforced concrete member 10 to which a shear force is most applied.

Second Embodiment
Next, a second embodiment of the present invention will be described.
As shown in FIGS. 4 to 6, in the reinforcing bar structure 1 </ b> A of the present embodiment, unlike the first embodiment, each foot portion 44 has a base end connected to the bent portion 42 and a predetermined end in a direction in which the distal ends approach each other. It is bent by an angle α. In the present embodiment, the pair of arm portions 31 are provided at the lower left corner portion in FIG.

  In the reinforcing bar structure 1A and the reinforced concrete member 10A according to the present embodiment, the same effects (1) to (4) as in the first embodiment are obtained, and the adhesion reinforcing bar 4 has a bent portion 42 at the base end. And a pair of legs 44 bent in the direction in which the tips are close to each other, and the tips of the legs 44 are at an intermediate position between the first main muscle 21A and the second main muscle 21B, and the third main muscle 21C and the second main muscle 21C. It does not reach an intermediate position with the four main muscles 21D. For this reason, it becomes difficult for the adhesion reinforcing bar 4 to come off from the inside of the reinforcing bar structure 1A. Moreover, it becomes easy to install the adhesion reinforcing bar 4 at the time of construction of the reinforcing bar structure 1A.

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.
For example, in the above embodiment, the first main bar 21A to the fourth main bar 21D, the ninth main bar 21I, and the tenth main bar 21L are arranged along the inner periphery of the shear reinforcement bar 3, but the main bar 2 is at least It is only necessary that the bars are arranged at the four corners of the shear reinforcement 3.

Also, in the embodiment, shear reinforcement 3 had a pair of arms 31, shear reinforcement 3 may not have an arm portion 31.

Moreover, in the said embodiment, the front-end | tip of the leg part 44 of 4 A of 1st adhesion reinforcement bars is in the intermediate position of 21 A of 1st principal muscles, and the 2nd principal muscle 21B, and the intermediate position of 21 C of 3rd principal muscles, and 4th principal muscle 21D. However, the present invention is not limited to this, and the intermediate position between the first main muscle 21A and the second main muscle 21B and the intermediate position between the third main muscle 21C and the fourth main muscle 21D may be reached.
Furthermore, in the said embodiment, the front-end | tip of the leg part 44 of the 2nd adhesion reinforcing bar 4B is in the intermediate position of 21 A of 1st main muscles, and the 2nd main bar 21B, and the intermediate position of 21 C of 3rd main bars, and the 4th main bar 21D. However, the present invention is not limited to this, and the intermediate position between the first main muscle 21A and the second main muscle 21B and the intermediate position between the third main muscle 21C and the fourth main muscle 21D may be reached.
And the front-end | tip of the leg part 44 of the 1st adhesion reinforcement bar | burr 4A and the front-end | tip of the foot part 44 of the 2nd adhesion reinforcement bar | burr 4B may overlap.

In the embodiment, the U-shaped portion 43 of the first adhesion reinforcing bar 4A is in contact with the first main bar 21A, the fourth main bar 21D, and the ninth main bar 21I, but is not limited thereto. the U-shaped portion 43, the first main reinforcements 21A, and may be the fourth main reinforcement 21 D or al a predetermined distance apart, the first main reinforcements 21A, and, it is sufficient to face the fourth main reinforcement 21 D.

The U-shaped part 43 of the second adhesion reinforcing bar 4B is in contact with the second main bar 21B, the third main bar 21C, and the tenth main bar 21L. However, the U-shaped part 43 is not limited to this. but the second main reinforcements 21B, and may be the third main reinforcement 21 C or et predetermined distance, the second main reinforcements 21B, and it suffices to face the third main reinforcement 21 C.

  INDUSTRIAL APPLICABILITY The present invention can be used as a reinforcing bar structure used for columns or beams and a reinforced concrete member using the same.

  DESCRIPTION OF SYMBOLS 1,1A ... Reinforcement structure, 2 ... Main reinforcement, 3 ... Shear reinforcement, 4 ... Adhesion reinforcement, 4A ... First adhesion reinforcement, 4B ... Second adhesion reinforcement, 10, 10A ... Reinforced concrete member, 21A ... First Main muscle, 21B ... 2nd main muscle, 21C ... 3rd main muscle, 21D ... 4th main muscle, 21E ... 5th main muscle, 21F ... 6th main muscle, 21G ... 7th main muscle, 21H ... 8th main muscle, 41 ... Back, 42 ... Bent part, 43 ... U-shaped part, 44 ... Foot

Claims (4)

A plurality of main bars extending in the axial direction;
A plurality of shear reinforcement bars arranged in a rectangular shape in a plane intersecting the axial direction of the main bars and arranged around the main bars;
An adhesive reinforcing bar provided adjacent to the shear reinforcing bar in the axial direction of the main bar,
The main bars are between the first main bar, the second main bar, the third main bar, the fourth main bar, and the first main bar and the second main bar, which are arranged clockwise in at least four corners of the shear reinforcement bar. A fifth principal muscle provided adjacent to the first principal muscle, a sixth principal muscle provided between the first principal muscle and the second principal muscle and adjacent to the second principal muscle, Between the third principal muscle and the fourth principal muscle and adjacent to the third principal muscle; between the third principal muscle and the fourth principal muscle and adjacent to the fourth principal muscle The 8th main muscle provided, the 9th main muscle provided between the 1st main muscle and the 4th main muscle, and the 10th main muscle provided between the 2nd main muscle and the 3rd main muscle And
The adhesion reinforcing bar surrounds at least the first principal muscle and the fourth principal muscle, an inner circumference abuts against the fifth principal muscle and the eighth principal muscle, and a first adhesion reinforcement which abuts against the ninth principal muscle. A muscle , and at least the second principal muscle and the third principal muscle, and has an inner circumference abutting against the sixth principal muscle and the seventh principal muscle, and a second adhesion reinforcing muscle abutting against the tenth principal muscle Reinforcement structure characterized by that. In the reinforcing bar structure according to claim 1,
The adhesion reinforcing bar includes a U-shaped part having a pair of bent parts bent from both ends of a back part extending in a direction orthogonal to the axial direction of the main bar, and from the tip of the bent part to the axial direction of the bent part. A pair of extending legs,
The U-shaped portion is opposed to at least the first principal muscle, the ninth principal muscle, and the fourth principal muscle,
The rebar structure is characterized in that the tip of the foot does not reach an intermediate position between the first and second main bars and an intermediate position between the third and fourth main bars. In the reinforcing bar structure according to claim 1,
The adhesion reinforcing bar has a U-shaped part having a pair of bent parts bent from both ends of a back part extending in a direction perpendicular to the axial direction of the main bar, and a base end connected to the bent part, and the distal ends thereof are mutually connected. A pair of legs bent in the direction of approach,
The U-shaped portion is opposed to at least the first principal muscle, the ninth principal muscle, and the fourth principal muscle,
The rebar structure is characterized in that the tip of the foot does not reach an intermediate position between the first and second main bars and an intermediate position between the third and fourth main bars. A reinforced concrete member, wherein the reinforcing bar structure according to any one of claims 1 to 3 is embedded therein.

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