JP2014015791A - Structure for reinforcing perforated beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the effect of reinforcing a peripheral part of a through-hole formed in a reinforced concrete beam.SOLUTION: A through-hole 30 is formed in a side surface 12S of a reinforced concrete beam 12. A reinforcing band 40 is arranged on a peripheral part of the through-hole 30. The reinforcing band 40 is formed like a frame and elongated along an outer peripheral surface of the beam 12. A gap between the reinforcing band 40 and the beam 12 is filled with mortar 50.

Description

  The present invention relates to a reinforcing structure for a perforated beam.

  A reinforcement structure is known in which a pair of steel plates are bonded to both side surfaces of a reinforced concrete beam in which a through hole is formed (see, for example, Patent Document 1). A pair of steel plates disclosed in Patent Document 1 are formed in an L-shaped cross section, and upper ends of each vertical portion are connected by a through bolt that penetrates the beam, and each horizontal portion is a lower surface of the beam. Are arranged along.

  Moreover, the earthquake-proof reinforcement structure which winds a steel plate with respect to the column made from a reinforced concrete is known (for example, refer patent document 2, 3).

Japanese Patent Laying-Open No. 2005-083047 JP 2007-2512 A JP 2002-242365 A

  However, in the technique disclosed in Patent Document 1, a part of the shearing force is transmitted between the steel plate and the beam through the through bolt and the horizontal portion of the steel plate at the time of the earthquake, but the steel plate peels off from the side surface of the beam. In the periphery of the through hole, the shearing force is not sufficiently transmitted, and there is a possibility that a sufficient reinforcing effect cannot be obtained.

  The techniques disclosed in Patent Documents 2 and 3 are seismic reinforcement techniques for columns, and do not reinforce a beam in which a through hole is formed.

  In view of the above facts, the present invention aims to enhance the reinforcing effect of the peripheral portion of the through hole formed in the reinforced concrete beam.

  The perforated beam reinforcing structure according to claim 1 is a reinforced concrete beam having a through-hole formed on a side surface, and a frame-like shape that is disposed in the periphery of the through-hole and extends along the outer peripheral surface of the beam. A reinforcing member, and a filler filled in a gap between the beam and the reinforcing member.

  According to the perforated beam reinforcing structure according to the first aspect, the frame-shaped reinforcing member extending along the outer peripheral surface of the beam is disposed around the through hole formed in the beam. The gap between the reinforcing member and the beam is filled with a filler, and the gap between the reinforcing member and the beam is filled with the filler. By surrounding the beam with this frame-shaped reinforcing member, shear force is transmitted between the upper and lower beam main bars via the reinforcing member in the event of an earthquake. That is, a transmission path for transmitting a shearing force between the upper and lower beam main bars is formed by the reinforcing member. Thereby, since the shear strength of the peripheral part of the through-hole of the beam is reinforced to be equal to or higher than that of the non-opening part, cracking or peeling off of the peripheral part is suppressed. Therefore, the reinforcement effect with respect to the peripheral part of the through-hole of a beam can be heightened.

  In addition, by surrounding the beam with a frame-shaped reinforcing member, the beam is restrained by the reinforcing member, and even when an earthquake occurs, the covering concrete on both sides in the beam width direction of the beam is prevented from bulging outward in the out-of-plane direction. The Accordingly, the above-described cracking and peeling of the cover concrete is suppressed.

  The perforated beam reinforcing structure according to claim 2 is the perforated beam reinforcing structure according to claim 1, wherein the reinforcing member includes a side wall portion extending along a side surface of the beam, and the side wall portion. However, it penetrates the slab protruding from the side surface of the beam in the vertical direction.

  According to the reinforcing structure for a perforated beam according to the second aspect, the side wall portion of the reinforcing member extending along the side surface of the beam penetrates the slab protruding from the side surface of the beam in the vertical direction. Thereby, a frame-shaped reinforcement member can be attached also to the beam in which the slab is integrated.

  The perforated beam reinforcing structure according to claim 3 is the perforated beam reinforcing structure according to claim 1 or 2, wherein the reinforcing member is adjacent to the through hole and the beam axial direction of the beam. Are arranged.

  According to the reinforcing structure for a perforated beam according to claim 3, the through hole and the reinforcing member are provided adjacent to each other in the beam axis direction of the beam, that is, the peripheral portion of the through hole is reinforced so as not to overlap the through hole. By arranging the member, it is not necessary to form an opening or the like leading to the through hole in the reinforcing member. Therefore, the processing cost etc. of a reinforcement member can be reduced.

  The perforated beam reinforcing structure according to claim 4 is the perforated beam reinforcing structure according to any one of claims 1 to 3, wherein the reinforcing member is arranged to overlap the through hole. The reinforcing member has an opening that communicates with the through hole.

  According to the reinforcing structure for a perforated beam according to the fourth aspect, the reinforcing member is formed with an opening leading to the through hole. The reinforcing member is disposed in the peripheral portion of the through hole so as to overlap the through hole. Therefore, a shearing force that acts directly above and below the through hole is transmitted to the upper and lower beam main bars via the reinforcing member. As a result, the shear strength immediately above and directly below the through-hole of the beam is reinforced to be equal to or greater than that of the non-opening portion, so that cracks and peeling immediately above and below the through-hole are suppressed. Therefore, the reinforcement effect with respect to the peripheral part of the through-hole of a beam can further be improved.

  As described above, according to the perforated beam reinforcing structure according to the present invention, it is possible to enhance the reinforcing effect of the peripheral portion of the through hole formed in the reinforced concrete beam.

(A) is a side view showing a beam to which a reinforcing structure for a perforated beam according to an embodiment of the present invention is applied, and (B) is a cross-sectional view taken along line 1B-1B of FIG. 1 (A). (A) And (B) is sectional drawing equivalent to FIG. 1 (B) explaining the attachment method of the reinforcement band shown by FIG. 1 (A). (A) is a schematic diagram corresponding to FIG. 1 (A) showing a transmission path of shear force at the time of earthquake of the beam shown in FIG. 1 (A), and (B) is at the time of earthquake of the beam according to the comparative example. It is a schematic diagram equivalent to FIG. 1 (A) which shows the transmission path | route of the shearing force in FIG. (A) is a partially enlarged view of FIG. 3 (B), and (B) is a conceptual diagram conceptually showing a shear force transmission truss mechanism. (A) And (B) is a side view which shows the beam to which the modification of the reinforcement structure of the perforated beam which concerns on one Embodiment of this invention was applied. (A)-(C) are sectional drawings which show the modification of the reinforcement band which concerns on one Embodiment of this invention. It is a side view which shows the beam to which the modification of the reinforcement band which concerns on one Embodiment of this invention was applied. It is sectional drawing equivalent to FIG. 1 (B) which shows the beam to which the reinforcement member which concerns on a reference example was applied. It is sectional drawing equivalent to FIG. 1 (B) which shows the beam to which the reinforcement member which concerns on a reference example was applied.

  Hereinafter, a perforated beam reinforcing structure according to an embodiment of the present invention will be described with reference to the drawings. In each figure, the arrow X indicates the beam axial direction (beam axis direction), the arrow Y indicates the beam width direction (beam width direction), and the arrow Z indicates the beam forming direction (vertical direction). Show.

(Configuration of beams)
1A and 1B show a reinforced concrete beam 12 to which the perforated beam reinforcement structure 10 according to the present embodiment is applied. The beam 12 is formed in a cross-sectional rectangle (cross-sectional rectangle) having a long side in the vertical direction (arrow Z direction), and an upper portion thereof is integrated with a slab 14 made of reinforced concrete. The slab 14 projects horizontally from the side surfaces 12S on both sides in the upper part of the beam 12.

  A plurality of upper beam main bars 20 and a plurality of lower beam main bars 22 as beam main bars are embedded in the beam 12 along the beam axis direction (arrow X direction). The plurality of upper beam main bars 20 are embedded above the beam 12 with a gap in the beam width direction (arrow Y direction), and the plurality of lower beam main bars 22 are spaced below the beam 12 in the beam width direction. It is buried in the space. In the present embodiment, the upper beam main reinforcement 20 has four upper bars and two lower bars, and the lower beam main bars 22 have two upper bars and four lower bars. However, the number and arrangement of the upper beam main bars 20 and the lower beam main bars 22 can be changed as appropriate.

  The plurality of upper beam main bars 20 and the lower beam main bars 22 are bound by a plurality of shear reinforcement bars 24. The plurality of shear reinforcement bars 24 are formed in a frame shape, and are embedded in the beam 12 with an interval in the beam axis direction. These shear reinforcement bars 24 are configured to transmit a shear force between the plurality of upper beam main bars 20 and the plurality of lower beam main bars 22.

  A circular through hole 30 that penetrates the beam 12 in the beam width direction is formed on the side surface 12S of the beam 12. The through hole 30 is used for, for example, equipment such as piping and wiring. In the present embodiment, the through hole 30 is formed at a substantially central portion in the beam forming direction of the beam 12.

(Structure of reinforcing member)
A pair of reinforcing bands 40 as a pair of reinforcing members are disposed around the through hole 30 in the beam 12. The pair of reinforcing bands 40 are disposed on both sides of the through hole 30 in the beam axis direction, and are adjacent to the through hole 30 in the beam axis direction. It is desirable that the pair of reinforcing bands 40 be disposed close to the through hole 30.

  Each reinforcing band 40 is formed in a frame shape having a rectangular cross section (cross sectional rectangle) with the long side in the vertical direction, and is disposed along the outer peripheral surface of the beam 12. The reinforcing band 40 includes a band main body 42 formed in a U-shaped cross section (open cross-sectional shape) opened upward, and a flat plate-like connection plate 44 provided on the opening side of the band main body 42. The band main body 42 is formed of a steel plate, and is disposed along a pair of side wall portions 42S respectively disposed along the side surfaces 12S on both sides of the beam 12, and a lower surface 12L of the beam 12, and the lower ends of the pair of side wall portions 42S. And a lower wall portion 42L for connecting the portions.

  The pair of side wall portions 42 </ b> S of the band main body 42 is disposed to face the side surface 12 </ b> S with a space (gap) between the side surfaces 12 </ b> S on both sides of the beam 12. Similarly, the lower wall portion 42L of the band main body 42 is disposed to face the lower surface 12L with a space (gap) between the lower surface 12L of the beam 12 and a gap (gap).

  The pair of side wall portions 42 </ b> S penetrates a pair of mounting holes 16 formed in the slab 14 projecting from the side surfaces 12 </ b> S on both sides of the beam 12 in the vertical direction, and each upper end portion 42 </ b> S <b> 1 is an upper surface of the slab 14. Projecting upward from The upper end portions 42S1 of the pair of side wall portions 42S are connected to each other by a connecting plate 44.

  The connecting plate 44 is formed of a steel plate in a flat plate shape and constitutes the upper wall portion of the reinforcing band 40. The connecting plate 44 is disposed along the upper surface 12U of the beam 12, and both end portions 44A in the width direction are joined to the upper end portions 42S1 of the pair of side wall portions 42S by welding or the like. Further, the connecting plate 44 is disposed to face the upper surface 12U with a space (gap) between the upper surface 12U of the beam 12 and a gap (gap). The beam 12 is surrounded by the reinforcing band 40 thus formed in a frame shape.

  A gap formed between the reinforcing band 40 and the beam 12 is filled with a mortar 50 such as a non-shrink mortar as a filler. The gap between the reinforcing band 40 and the beam 12 is filled with the mortar 50, and the reinforcing band 40 is in close contact with the outer peripheral surface (side surface 12S, upper surface 12U, lower surface 12L) of the beam 12 through the mortar 50.

  Next, an example of a method for forming the through hole 30 for the beam 12 will be described, and an example of a method for attaching the reinforcing band 40 will be described.

  First, when forming the through-hole 30 with respect to the already-constructed beam 12, for example, the positions of the upper-end beam main bar 20, the lower-end beam main bar 22, and the shear reinforcement bar 24 at the site where the through-hole 30 is formed are checked. These positions are marked on the beam 12. Then, the side surface 12S of the beam 12 is cored so as to avoid the upper end beam main bar 20, the lower end beam main bar 22, and the shear reinforcement bar 24, and the through hole 30 is formed. In the present embodiment, the two shear reinforcement bars 24 located on both sides of the through hole 30 are cut when the core is removed.

  Next, as shown in FIG. 2A, a pair of attachment holes 16 penetrating the slab 14 in the vertical direction are formed in the slabs 14 protruding from the side surfaces 12S on both sides of the beam 12, respectively. At this time, the pair of attachment holes 16 are formed along the side surfaces 12 </ b> S on both sides of the beam 12. Next, the band main body 42 of the pair of reinforcing bands 40 is attached to the periphery of the through hole 30 in the beam 12 from below.

  Specifically, the beam 12 is inserted between the pair of side wall portions 42 </ b> S, and the upper portions of the pair of side wall portions 42 </ b> S are inserted into the pair of attachment holes 16 formed in the slab 14. In this state, the connecting plate 44 is disposed along the upper surface 12U of the beam 12 between the upper end portions 42S1 of the pair of side wall portions 42S protruding upward from the upper surface of the slab 14, and both end portions 44A of the connecting plate 44 in the width direction are disposed. Are welded to the upper end portions 42S1 of the pair of side wall portions 42S, respectively.

  Next, a sealing member (not shown) is disposed along the peripheral edge of the reinforcing band 40 to seal the gap between the reinforcing band 40 and the beam 12. In this state, the mortar 50 is filled into the gap between the reinforcing band 40 and the beam 12 from a filling hole (not shown) formed in the seal member, and after the mortar 50 is cured (cured), the seal member is removed. Thereby, the reinforcement band 40 is integrated with the outer peripheral surface of the beam 12.

  Thus, in the present embodiment, the slab 14 is integrated by vertically passing a part (upper part) of the pair of side wall portions 42 </ b> S of the reinforcing band 40 through the pair of mounting holes 16 formed in the slab 14. The reinforcing band 40 can also be attached to the beam 12 made.

  Next, the effect | action of the reinforcement structure of a perforated beam which concerns on this embodiment is demonstrated.

  First, in order to clarify the operation of the reinforcing band 40 according to this embodiment, the beam 100 according to the comparative example will be described. FIG. 3B shows a beam 100 according to a comparative example. The beam 100 is formed with the through hole 30 as in the beam 12 in the present embodiment, but is different from the beam 12 in the present embodiment in that the pair of reinforcing bands 40 are not attached.

As shown in FIG. 3B, a shearing force Q is transmitted from a column (not shown) to the beam 100 during an earthquake or the like. As shown in FIGS. 4 (A) and 4 (B), this shearing force Q is mainly composed of the compressive force (compressed bundle) C _{0 in} the oblique direction of concrete and the lower beam main reinforcement 22 (or the upper beam main reinforcement for concrete). and adhesion J along the axial direction of 20), truss mechanism formed by the tensile force T ₀ along the axial direction (vertical direction) of the shear reinforcement 24 (hereinafter, referred to as "shear force transmission truss mechanism") Is transmitted from one end of the beam 12 in the beam axis direction to the other end.

On the other hand, as shown in FIG. 3B, the shear reinforcement bar 24 cannot be arranged at the part of the beam 100 where the through hole 30 is formed, and the shearing reinforcement 24 is relatively sheared compared to other parts. The amount of reinforcing bars 24 is reduced. Therefore, the tensile force T ₀ (see FIG. 4A) of the shear reinforcing bar 24 cannot be sufficiently obtained at the peripheral portion of the through hole 30 in the beam 100, and the concrete compressive force C ₁ is applied to the peripheral portion. It becomes easy to concentrate. As a result, the shear strength of the beam 100 decreases at the periphery of the through hole 30 in the beam 100.

  On the other hand, in this embodiment, as shown in FIG. 3A, a pair of reinforcing bands 40 are arranged on both sides of the through hole 30 in the beam axis direction. By surrounding the peripheral portion of the through hole 30 in the beam 12 with these reinforcing bands 40, the pair of reinforcing bands 40 exhibits the same function as the shear reinforcing bar 24. As a result, a new transmission path for transmitting the shearing force Q between the lower beam main bar 22 and the upper beam main bar 20 is formed. That is, a new shearing force transmission truss mechanism is formed around the through hole 30.

Specifically, the compressive force C _{2 of} the concrete, the adhesive force J of the lower beam main reinforcement 22 (or the upper beam main reinforcement 20) to the concrete (see FIG. 4A), and the vertical tensile force T along the reinforcing band 40 ₁ forms a shear force transmission truss structure. Thus, compressive forces C ₁ of the concrete to focus the periphery of the through hole 30 _(see FIG. 3 (B)) is reduced. Therefore, cracks and peeling off of the peripheral portion of the through hole 30 are suppressed.

  Further, in this embodiment, the beam 12 is surrounded by the reinforcing band 40 so that the beam 12 is constrained by the reinforcing band 40, and even in an earthquake, the cover concrete on both sides in the beam width direction of the beam 12 is outside in the out-of-plane direction. It is suppressed that it bulges out. Accordingly, the above-described cracking and peeling of the cover concrete is suppressed.

  As described above, according to the perforated beam reinforcing structure 10 according to the present embodiment, the reinforcing effect of the peripheral portion of the through hole 30 formed in the beam 12 made of reinforced concrete can be enhanced. Furthermore, with a simple reinforcing structure, the shear strength of the peripheral part of the through hole 30 can be reinforced to be equal to or greater than that of the non-opening part.

  The reinforcing band 40 is attached to the outer peripheral surface of the beam 12. Therefore, as compared with a reinforcing method in which a shear reinforcement bar or the like is newly embedded in the periphery of the through hole 30 in the beam 12, the periphery of the through hole 30 can be reinforced without damaging the beam 12. Moreover, by attaching the reinforcement band 40 to the outer peripheral surface of the beam 12, it is possible to improve the workability, reduce the construction cost, and shorten the construction period.

  In the present embodiment, the through hole 30 and the reinforcing band 40 are adjacent to each other in the beam axis direction, that is, the reinforcing band 40 is disposed in the periphery of the through hole 30 so as not to overlap the through hole 30. Therefore, it is not necessary to form an opening 86 or the like leading to the through hole 30 in the reinforcing band 40 as in a reinforcing band 80 (see FIG. 7) described later. Therefore, the processing cost etc. of the reinforcement band 40 can be reduced.

  Furthermore, in this embodiment, the gap between the reinforcing band 40 and the beam 12 is filled with the mortar 50, and the reinforcing band 40 is in close contact with the outer peripheral surface of the beam 12 through the mortar 50. Since this mortar 50 is a designated building material, it can also be applied to a new structure. Therefore, the reinforcing structure 10 for a perforated beam according to the present embodiment can be applied not only to the beam 12 in the existing structure but also to the beam 12 in the new structure. In particular, the perforated beam reinforcing structure 10 according to the present embodiment is effective as a reinforcing structure of the beam 12 in which the through-holes 30 for equipment and the like are formed by a design change after completion of the frame construction.

  Next, a modification of the above embodiment will be described.

  In the said embodiment, although the example which has arrange | positioned a pair of reinforcement band 40 on the both sides of the beam axis direction of the through-hole 30 was shown, it does not restrict to this. The arrangement of the reinforcing band 40 can be appropriately changed depending on the size and position of the through hole 30. For example, one reinforcing band 40 may be arranged on one side of the through hole 30 in the beam axis direction.

  Specifically, as shown in FIG. 5A, when the through hole 30 is formed at the end 12A of the beam 12 in the beam axis direction, that is, the through hole 30 is formed adjacent to the column 18. In this case, the reinforcing band 40 may be disposed only on the side opposite to the pillar 18 with respect to the through hole 30. Further, as shown in FIG. 5B, when the through hole 30 is adjacent to the small beam 19, the reinforcing band 40 may be disposed only on the opposite side of the small beam 19 with respect to the through hole 30. good.

  Moreover, in the said embodiment, although the example which formed the band main body 42 in the cross-sectional U-shape which opened upwards was shown, it does not restrict to this. The shape of the band main body 42 can be changed as appropriate. For example, a band main body 62 is formed in a U-shaped cross-section with an opening at the bottom like a reinforcing band 60 shown in FIG. The lower wall portion of the band 60 may be configured. In this case, the connecting plate 64 can be welded to the band body 62 from the lower side of the beam 12 (see FIG. 1B).

  6B, the pair of side wall portions 70S, the upper wall portion (upper connection plate) 70U, and the lower wall portion (lower side connection plate) 70L are separated into separate plates (steel plates). ) And can be welded on site. In this case, the reinforcing band 70 corresponding to the size of the beam 12 can be formed by appropriately combining a plurality of plates.

  Further, like the reinforcing band 72 shown in FIG. 6C, a pair of side wall portions 72S, an upper wall portion 72U, and a lower wall portion 72L are formed integrally, and the beam 12 is constructed in the form of the beam 12 when the beam 12 is constructed. By installing, the reinforcing band 72 can be integrated with the outer peripheral surface of the beam 12. In this case, welding work at the site can be eliminated.

  Further, as shown in FIG. 7, a wide reinforcing band 80 may be attached to the beam 12 so as to overlap the through hole 30. A circular opening (through hole) 86 communicating with the through hole 30 is formed in the side wall portion 82S of the band main body 82 of the reinforcing band 80. Thereby, the through hole 30 formed in the beam 12 is opened.

  In this way, by attaching the reinforcing band 80 to the beam 12 so as to overlap the through hole 30, it is possible to reinforce the portion directly above and directly below the through hole 30. That is, during an earthquake, the shearing force Q (see FIG. 3A) that acts directly above and below the through hole 30 is transmitted to the upper beam main bar 20 and the lower beam main bar 22 through the reinforcing band 80. Thereby, since the concentration of the shearing force Q directly above and directly below the through hole 30 of the beam 12 is reduced, cracks and peeling immediately above and below the through hole 30 are suppressed. Therefore, the reinforcement effect with respect to the peripheral part of the through hole 30 in the beam 12 can be further enhanced. Furthermore, with a simple reinforcement structure, the shear consideration strength directly above and below the through hole 30 can be reinforced to be equal to or greater than that of the non-opening portion.

  Moreover, in the said embodiment, although the example which filled the clearance gap between the reinforcement band 40 and the beam 12 with the mortar 50 as a filler was shown, it does not restrict to this. As the filler, for example, a cement filler including mortar, grout or the like may be filled, or a resin-based resin filler may be filled. An adhesive can also be used as the filler.

  Furthermore, although the example which formed the circular through-hole 30 in the side surface 12S of the beam 12 was shown in the said embodiment, it is not restricted to this. The size and shape of the through hole formed in the side surface 12S of the beam 12 can be appropriately changed according to the application. For example, a rectangular through hole may be formed in the side surface 12S of the beam 12. Moreover, in the said embodiment, although the example which formed the through-hole 30 in the approximate center part of the beam forming direction of the beam 12 was shown, arrangement | positioning of the through-hole 30 can be changed suitably.

  Furthermore, in the above-described embodiment, an example in which the pair of reinforcing bands 40 is attached to the beam 12 with which the slab 14 is integrated is shown. However, the pair of reinforcing bands 40 with respect to the beam 12 with which the slab 14 is not integrated. May be attached.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

  Next, a reference example will be described.

  FIG. 8 shows a pair of reinforcing members 90 </ b> A and 90 </ b> B attached to the side portions on both sides of the beam 12. The pair of reinforcing members 90 </ b> A and 90 </ b> B are formed in a U-shaped cross section with an opening on the beam 12 side, and are disposed to face each other with the beam 12 interposed therebetween. In addition, since a pair of reinforcement member 90A, 90B is the same structure, below, one reinforcement member 90A is demonstrated and description is abbreviate | omitted about the other reinforcement member 90B.

  The reinforcing member 90A includes a side wall portion 90S arranged along the side surface 12S of the beam 12, an upper wall portion 90U extending from the upper end portion of the side wall portion 90S along the upper surface 12U of the beam 12, and a lower end of the side wall portion 90S. And a lower wall portion 90L extending along the lower surface 12L of the beam 12.

  The upper wall portion 90U of the reinforcing member 90A extends from the upper end portion of the side wall portion 90S to the upper end beam main bar 20 (second from the left in FIG. 8) embedded in the intermediate portion of the beam 12 in the beam width direction. Similarly, the lower wall portion 90L of the reinforcing member 90A extends from the lower end portion of the side wall portion 90S to the lower end beam main reinforcement 22 (second from the left in FIG. 8) embedded in the intermediate portion of the beam 12 in the beam width direction. It is extended. Thereby, a shearing force can be transmitted between the upper-end beam main bar 20 and the lower-end beam main bar 22 via the reinforcing member 90A during an earthquake. Therefore, the same operation and effect as the above embodiment can be obtained.

  The upper wall portion 90U of the reinforcing member 90A only needs to extend at least to the position of the upper-end beam main reinforcing bar 20 closest to the side wall portion 90S of the reinforcing member 90A (first from the left in FIG. 8). Similarly, the lower wall portion 90L of the reinforcing member 90A only needs to extend at least to the position of the bottom beam main reinforcement 22 closest to the side wall portion 90S of the reinforcing member 90A (first from the left in FIG. 8).

  Further, as shown in FIG. 9, a frame-shaped reinforcing band 92 can be embedded in the beam 12. For example, when the beam 12 is constructed, the reinforcing band 92 is disposed in the form of the beam 12 so as to surround the plurality of upper beam main bars 20 and the lower beam main bars 22 and is embedded in the beam 12. In this way, by binding the plurality of upper beam main bars 20 and the lower beam main bars 22 with the reinforcing band 92, a shearing force is generated between the upper beam main bar 20 and the lower beam main bar 22 via the reinforcing band 92 in the event of an earthquake. Can be transmitted. Therefore, the same operation and effect as the above embodiment can be obtained.

  Furthermore, the reinforcing band 40 according to the above-described embodiment can be applied to a column in which a through hole is formed.

DESCRIPTION OF SYMBOLS 10 Reinforcing structure of perforated beam 12 Beam 12S Side surface 14 Slab 30 Through hole 40 Reinforcement band (reinforcement member)
42S side wall 50 mortar (filler)
60 Reinforcement band (reinforcement member)
70 Reinforcement band (reinforcement member)
72 Reinforcement band (reinforcement member)
80 Reinforcement band (reinforcement member)
86 opening

Claims (4)

A reinforced concrete beam with through-holes on the side;
A frame-shaped reinforcing member disposed around the through hole and extending along the outer peripheral surface of the beam;
A filler filled in a gap between the beam and the reinforcing member;
Perforated beam reinforcement structure with The reinforcing member has a side wall portion extending along a side surface of the beam;
The side wall portion vertically penetrates a slab protruding from the side surface of the beam,
The reinforcing structure for a perforated beam according to claim 1. The reinforcing member is disposed adjacent to the through hole and the beam axis direction of the beam,
The reinforcing structure for a perforated beam according to claim 1. The reinforcing member is disposed so as to overlap the through hole, and the reinforcing member has an opening leading to the through hole.
The reinforcing structure for a perforated beam according to any one of claims 1 to 3.

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