JP4350251B2 - Reinforcement structure and reinforcement structure of beam through hole - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing structure and a reinforcing structure for a beam through-hole that disperses cracks in the periphery of the through-hole provided to arrange equipment piping and the like in a beam of a reinforced concrete structure and a steel reinforced concrete structure.
[0002]
[Prior art]
In buildings with reinforced concrete structures and steel reinforced concrete structures, through holes are provided in advance in the beams in order to install equipment piping and the like after the completion of the frame construction. In order to compensate for the decrease in shear strength caused by the through-holes, the beams with such through-holes are reinforced with conventional reinforcing bars or the existing beam through-hole reinforcements evaluated at the Nippon Building Center. It has been broken. However, recently, the beam-through-hole reinforcing bars are frequently used due to the shortage of workers.
[0003]
[Problems to be solved by the invention]
By the way, the ready-made beam through-hole reinforcing bars are arranged on the inner side surrounded by the shear reinforcing bars, thereby exhibiting a shear strength at the time of an earthquake and preventing a shear failure of the beam through-hole portions. However, since the prefabricated beam through-hole reinforcing bars are arranged on the inner side surrounded by the shear reinforcing bars, a dispersion effect and a prevention effect cannot be expected for cracks in the through-holes generated on the concrete surface of the beam. For this reason, in a reinforced concrete structure and a steel reinforced concrete structure building, the concrete surface tends to be cracked starting from the beam through hole. In addition, since concrete shrinks when dried, this causes cracks.
[0004]
Next, let us consider the occurrence of cracks in beam through-holes in buildings with reinforced concrete structures and steel reinforced concrete structures. In a normal building, the concrete surfaces of the pillar A and the beam B are often matched as shown in FIG. Moreover, as shown in FIG. 8, when fixing the column A and the beam B, it is necessary to arrange the main bar b of the beam B inside the main bar a of the column A. In this way, with the main bar b of the beam B arranged inside the main bar a of the column A, when the concrete surfaces of the column A and the beam B are made to coincide, the concrete cross section of the beam B becomes the diameter of the main bar a of the column A. The cover concrete up to the shear reinforcement of the beam B is larger than the numerical value determined by the standard (note that the dotted concrete position in FIG. 8 is the concrete surface with the standard value of the cover concrete up to the shear reinforcement of the beam B .) Thus, since the cover concrete of the beam B is large, when a crack is generated from the beam through hole due to drying shrinkage on the concrete surface, the crack width of the beam through hole is expanded.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a reinforcing structure and a reinforcing structure for a beam through hole that disperses cracks in the beam through hole and prevents the crack width from expanding.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a plurality of horizontal bars arranged in parallel in the peripheral direction of the beam through hole, and arranged in parallel in the vertical direction in the peripheral part of the beam through hole. Arranged in a grid pattern at the periphery of the beam through-hole, joined to the horizontal bar with a plurality of vertical bars joined to the horizontal bar, and joined to the horizontal bar at a predetermined interval with the horizontal bar The reinforcing structure is composed of the joining plates to be joined, and this reinforcing structure is arranged outside the beam arrangement and around the beam through hole so as to surround the beam through hole. Joined to the muscle.
[0007]
In the present invention, positioning means for positioning the reinforcing structure with respect to the beam through hole is provided.
[0008]
Further, according to the present invention, the positioning means is elastic to a vertical positioning vertical foot bar and a horizontal positioning horizontal foot bar that contact the sleeve for forming the beam through-hole or a sleeve for forming the beam through-hole. It is a band ring that can be elastically expanded and contracted in the form of a partially cut ring that is externally fitted and fixed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0010]
1 to 3 show a first embodiment of the present invention, in which 1 denotes a reinforcing structure in the first embodiment. This reinforcement structure 1 is for reinforcing the through hole 3 of the beam 2 in a reinforced concrete structure and a steel reinforced concrete structure building.
[0011]
As shown in FIG. 1, the reinforcing structure 1 includes a plurality of, for example, five horizontal bars 4 having a predetermined length and a plurality of, for example, six vertical bars 5 having a predetermined length. The bar 4 is arranged in parallel in the horizontal direction on the upper side and the lower side of the through hole 3 of the beam 2, and the vertical bar 5 is arranged in parallel in the vertical direction on both sides of the through hole 3 of the beam 2. The material 4 and the vertical bar material 5 are arranged in a lattice pattern at the periphery of the through-hole 3, and the crossing part of the horizontal bar material 4 and the vertical bar material 5 is welded or tightly connected by a small diameter wire. They are joined together by a known joining means such as. Further, in order to position the reinforcing structure 1 with respect to the through hole 3 of the beam 2, a vertical foot bar 6 for positioning in the vertical direction that abuts a sleeve (not shown) for forming a through hole and a lateral positioning member. A lateral foot bar 7 is provided. The vertical foot bar 6 is disposed on the upper and lower sides of the through hole 3 of the beam 2 in parallel with the vertical bar member 5 on the center line of the through hole 3, and welds the crossing portion with the horizontal bar member 4 or They are joined to each other by a known joining means such as a tightly connected wire having a small diameter. The horizontal foot bar 7 is arranged on both sides of the through-hole 3 of the beam 2 in parallel with the horizontal bar member 4 on the center line of the through-hole 3, and welds a crossing portion with the vertical bar member 5 or has a small diameter. They are joined to each other by a known joining means such as fastening with a number wire. As for the material of the horizontal bar member 4, the vertical bar member 5, the vertical leg bar 6, and the horizontal leg bar 7, reinforcing steel, other steel materials, and other appropriate metal materials can be applied. In the first embodiment, since the slab is disposed on the upper side of the beam 2 and the shear strength and rigidity are large, the crack width is generally small. Many 4 are arranged.
[0012]
Moreover, in 1st Embodiment, in order to ensure the cover thickness of concrete, the plastic-made donut-shaped spacer 8 is used. That is, by attaching the spacer 8 to the horizontal bar 4 of the reinforcing structure 1, the distance between the reinforcing structure 1 and the beam forming frame (not shown) in the spacer 8 is a reference value of the concrete cover thickness (for example, 30 mm), and the concrete cover thickness is secured.
[0013]
In the first embodiment, as shown in FIGS. 1 to 3, the reinforcing structure 1 is disposed outside the beam bar 11 composed of the main reinforcing bar 9 and the shear reinforcing bar 10 of the beam 2 and the through hole 3 of the beam 2. Are joined to the beam reinforcement 11 via the joining plate 12. As shown in FIG. 4, the joining plate 12 is formed in a substantially hat shape, and is joined to the horizontal bar 4 at a plurality of locations (for example, four locations) of the reinforcing structure 1 in advance by known joining means such as welding. A predetermined interval, for example, 10 to 30 mm, is provided with respect to the beam reinforcing bar 11 by welding to the shear reinforcing bar 10 of the beam reinforcing bar 11 or by joining with a known connecting means such as a tight connecting with a thin wire. The reinforcing structure 1 is joined to the beam reinforcing bar 11 so that the cover thickness of the concrete becomes a reference value with the spacer 8 in a state with a certain interval.
[0014]
In 1st Embodiment comprised as mentioned above, the intensity | strength of the peripheral part of the through-hole 2 is improved by the reinforcement structure 1, and the crack of the through-hole 3 is disperse | distributed. Moreover, the bonding resistance between the reinforcing structure 1 and the concrete is increased by the plurality of joining plates 12 joining the reinforcing structure 1 and the beam reinforcement 11, and the adhesion strength of the concrete is improved. Thereby, even if a crack arises due to drying shrinkage of the concrete, it is possible to prevent the crack width of the through hole 3 from expanding.
[0015]
FIG. 5 shows a modification of the reinforcing structure 1 according to the first embodiment shown in FIGS. 1 to 3, which includes a vertical foot bar 6 for longitudinal positioning and a lateral foot bar 7 for lateral positioning. Instead, a positioning band 13 is provided. The band 13 is a partially-notched ring that is formed by bending a thin band steel and can be elastically expanded and contracted. The band 13 is formed on the horizontal bar 4 disposed above the through hole 3. It is joined to the joined support bar 14 by a known joining means such as welding, and is elastically fitted and fixed to a sleeve for forming a through hole. The reinforcing structure 1 can be positioned with respect to the through hole 3 of the beam 2 by elastically fitting and fixing the belt ring 13 to the through hole forming sleeve, and the periphery of the through hole 3. Can be arranged in the part.
[0016]
6 and 7 show a second embodiment of the present invention. In the figure, reference numeral 15 denotes a reinforcing structure in the second embodiment. The reinforcing structure 15 includes a plurality of, for example, five horizontal bars 16 having a predetermined length and a plurality of, for example, four L-shaped vertical bars 17 having a predetermined length. By arranging the L-shaped rods 17 in parallel in the vertical direction on the lower sides of the through holes 3 in the beam 2 while arranging them in parallel in the horizontal direction below the through holes 3 in the beam 2, The vertical bars 17 are arranged in an L-shaped lattice at the lower peripheral portion of the through-hole 3, and the crossing portions of the horizontal bars 16 and the vertical bars 17 are welded, or a small diameter They are joined to each other by a known joining means such as a tight wire. In the figure, 18 is a plastic donut-shaped spacer for securing the cover thickness of concrete, 19 is a joining plate for joining the reinforcing structure 15 to the beam reinforcement 11, and is known in advance such as welding. The reinforcing member 1 is joined to the horizontal bar 16 at a plurality of locations (for example, two locations) by the joining means.
[0017]
In the second embodiment, as shown in FIGS. 6 and 7, the reinforcing structure 15 is L-shaped outside the beam arrangement 11 of the beam 2 and on the lower peripheral portion of the through hole 3 of the beam 2. The welding plate 19 is welded to the shear reinforcing bar 10 of the beam reinforcing bar 11 or is joined to the beam reinforcing bar 11 by a known joining means such as a tightly connected wire having a small diameter. The reinforcing structure 15 is joined to the beam reinforcement 11 in a state where a predetermined interval, for example, an interval of about 10 to 30 mm is provided and the concrete cover thickness becomes the reference value by the spacer 18.
[0018]
In the second embodiment configured as described above, the strength of the lower peripheral portion of the through hole 2 that is generally susceptible to cracking is improved by the reinforcing structure 15, and cracks in the through hole 2 are dispersed. Become. In addition, the bonding resistance between the reinforcing structure 15 and the concrete is increased by the plurality of joining plates 19 joining the reinforcing structure 15 and the beam reinforcement 11, and the adhesion strength of the concrete is improved. Thereby, even if a crack arises due to drying shrinkage of the concrete, it is possible to prevent the crack width of the through hole 3 from expanding.
[0019]
【The invention's effect】
As described above, according to the present invention, the cracks of the through holes are dispersed by the reinforcing structure and the adhesion strength of the concrete is improved. Great effect to prevent widening. Moreover, it is possible to reinforce the lower side of the through-hole that is generally easily cracked. In addition, since the reinforcing structure is provided with positioning means, positioning with respect to the through hole of the beam is easy. Furthermore, since the reinforcing structure can be manufactured in advance in a factory or the like, the work at the site can be reduced and the workability at the site is good.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional front view of a main part of a beam according to a first embodiment of the present invention.
FIG. 2 is a longitudinal side view of a main part of a beam according to a first embodiment of the present invention.
FIG. 3 is a cross-sectional plan view of a main part of the beam according to the first embodiment of the present invention.
FIG. 4 is a perspective view of a joining plate.
FIG. 5 is a front view of a modified example of the reinforcing structure of the first embodiment.
FIG. 6 is a longitudinal sectional front view of a main part of a beam according to a second embodiment of the present invention.
FIG. 7 is a longitudinal side view of a main part of a beam according to a second embodiment of the present invention.
FIG. 8 is a cross-sectional view of columns and beams of a reinforced concrete structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcement structure 2 Beam 3 Through-hole 4 Horizontal bar material 5 Vertical bar material 6 Vertical foot rod 7 for vertical positioning 7 Horizontal foot rod 8 for horizontal positioning Spacer 11 Beam arrangement 12 Joint plate 13 Positioning band 14 Support bar 15 Reinforcement structure 16 Horizontal bar 17 L-shaped vertical bar 18 Spacer 19 Bonding plate

Claims (7)

A plurality of horizontal bars arranged outside the beam reinforcement and surrounding the beam through hole in the periphery of the beam through hole, and arranged in parallel in the lateral direction around the beam through hole; and , they are arranged parallel to the longitudinal direction in the peripheral portion of the beam through holes in the peripheral portion of the horizontal bar and the beam through holes as well as arranged in a grid pattern, and longitudinal bars of the plurality of joining together the transverse bar, the transverse A reinforcing structure for a beam through-hole, comprising a joining plate joined to a bar and joining the horizontal bar to a beam reinforcement at a predetermined interval. 2. The reinforcing structure for a beam through hole according to claim 1, wherein the horizontal bar is arranged on the upper side and the lower side of the beam through hole, and the vertical bar is arranged on both sides of the beam through hole. A horizontal bar is arranged in an L shape along the lower surface from the side of the beam only on the lower side of the beam through-hole, and an L-shaped vertical bar is formed on the lower side of the beam through-hole along the lower surface from the side of the beam. The horizontal bar and the L-shaped vertical bar are arranged in an L-shaped lattice at the lower periphery of the beam through hole, and the cross between the horizontal bar and the L-shaped vertical bar. The reinforcing structure for a beam through hole according to claim 1, wherein the portions are joined.   The reinforcing structure for a beam through hole according to claim 1 or 2, wherein positioning means for positioning with respect to the beam through hole is provided in the horizontal bar and the vertical bar.   5. The reinforcing structure for a beam through hole according to claim 4, wherein the positioning means is a vertical foot rod for vertical positioning and a horizontal foot rod for horizontal positioning that abuts on a sleeve for forming a beam through hole. .   5. The beam penetration according to claim 4, wherein the positioning means is an elastically expandable / deformable belt ring having a partially cut ring shape that is elastically fitted and fixed to a sleeve for forming a beam through hole. Hole reinforcement structure.   The reinforcing structure according to any one of claims 1 to 6 is disposed outside the beam reinforcement and surrounding the beam penetration hole at the periphery of the beam penetration hole, and the joint plate of the reinforcement structure is used as the beam reinforcement. Reinforcement structure of beam through hole, characterized by joining.

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