JPH02225750A - Reinforcing structure of perforated reinforced concrete beam and reinforcing metal therefor - Google Patents
Reinforcing structure of perforated reinforced concrete beam and reinforcing metal thereforInfo
- Publication number
- JPH02225750A JPH02225750A JP15570589A JP15570589A JPH02225750A JP H02225750 A JPH02225750 A JP H02225750A JP 15570589 A JP15570589 A JP 15570589A JP 15570589 A JP15570589 A JP 15570589A JP H02225750 A JPH02225750 A JP H02225750A
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing
- reinforcing bars
- sides
- main
- bars
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 162
- 239000002184 metal Substances 0.000 title claims description 30
- 239000011150 reinforced concrete Substances 0.000 title claims description 15
- 230000002787 reinforcement Effects 0.000 claims description 38
- 238000000034 method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 11
- 238000010276 construction Methods 0.000 description 7
- 238000004873 anchoring Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、鉄筋コンクリート有孔梁の補強構造及びそ
れに用いる補強金具に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a reinforcement structure for a reinforced concrete perforated beam and a reinforcing metal fitting used therein.
尚、この明細書で「鉄筋コンクリート」という場合には
、鉄骨鉄筋コンクリートをも含むものとする。In this specification, the term "reinforced concrete" also includes steel-framed reinforced concrete.
〈従来技術〉
鉄筋コンクリート有孔梁というのは、水道管や電線管等
を貫通させるだめの貫通孔が形成された鉄筋コンクリー
ト粱のことで、強度上の問題から、その貫通孔の周囲は
補強されねばならない。そして、その補強は、特に斜め
せん断力に関し貫通孔の存在が弱点となるので、斜めせ
ん断力に対する補強が主として要求される。<Prior art> Reinforced concrete perforated beams are reinforced concrete beams that have through-holes formed through which water pipes, electrical conduit pipes, etc. can pass.Due to strength issues, the area around the through-holes must be reinforced. It won't happen. In particular, since the presence of the through hole becomes a weak point with respect to diagonal shear force, reinforcement against diagonal shear force is mainly required.
そのような補強構造乃至補強金具としては、従来より、
例えば、特公昭４４−２１２６０号、特公昭５９ １０
４５４号、特開昭５２−１４．６９２５号、特開昭５４
−７５１１７号、実開昭５５−２２４０２号等により種
々のものが知られている。Conventionally, such reinforcing structures or reinforcing metal fittings are
For example, Special Publication No. 44-21260, Special Publication No. 59-10
No. 454, JP-A-52-14.6925, JP-A-54
Various types are known, such as No.-75117 and Japanese Utility Model Application Publication No. 55-22402.
例えば、特公昭５９−１０４５４号のものをみると、こ
の補強金具は、内外多重の無端状の金属環状体とこれら
の環状体を互いに連結する複数の連結杆とからなるもの
で、特に平面形状となっていることにより施工性の向上
が図られているものである。For example, in Japanese Patent Publication No. 59-10454, this reinforcing metal fitting consists of an endless metal annular body with multiple inner and outer layers and a plurality of connecting rods that connect these annular bodies to each other. This is intended to improve workability.
〈発明が解決しようとする課題〉
しかし、この特公昭５９−１０４５４号の補強金具も最
善のものというわけではない。例えば、鉄骨鉄筋コンク
リート造りの場合であると、第４図に示されるように、
中心に配された形鋼２１の側縁と主筋７との隙間Ｗは通
常の梁で２０〜２５印位しかない。従って、通常用いら
れる１２φの鉄筋を用いて作られた内外多重の環状体２
２と複数の連結杆２３とからなり、環状体２２と連結杆
２３との合計厚みが２４ｎ＋ｍとなる補強金具２・１が
この狭い隙間Ｗにかかる場合には、はとんど施工不可能
な状況になりかねない。<Problems to be Solved by the Invention> However, the reinforcing metal fittings disclosed in Japanese Patent Publication No. 59-10454 are not necessarily the best. For example, in the case of steel reinforced concrete construction, as shown in Figure 4,
The gap W between the side edge of the shaped steel 21 placed at the center and the main reinforcement 7 is only 20 to 25 marks in a normal beam. Therefore, the internal and external multiple annular body 2 is made using normally used 12φ reinforcing bars.
2 and a plurality of connecting rods 23, and the total thickness of the annular body 22 and the connecting rods 23 is 24n+m, if the reinforcing metal fitting 2.1 spans this narrow gap W, it is almost impossible to construct it. situation could arise.
具体的に言えば、貫通孔（図中には貫通孔形成用のスリ
ーブ９として示される）は、排水勾配などの関係から斜
めに形成され、その開口端が梁の上下、つまり主筋７に
近い方へ偏ることが多いが、このような場合については
、円環乃至はそれに近く、全方向に同一サイズの拡がり
を持つ補強金具２４の場合には、貫通孔（スリーブ９）
と最内の環状体２２ｉとの間に要求される「かぶり厚」
つまり鉄筋とコンクリート表面との間の厚みを確保する
ようにすると、どうしても最外の環状体２２０及び連結
杆２３が前述の狭い隙間Ｗにかかってしまい、前述のよ
うな施工困難性を招いてしまう。Specifically, the through-hole (shown as a sleeve 9 for through-hole formation in the figure) is formed diagonally due to the drainage slope, etc., and its open end is located above and below the beam, that is, close to the main reinforcing bar 7. However, in such cases, if the reinforcing metal fitting 24 is a ring or close to it and has the same size in all directions, the through hole (sleeve 9)
and the innermost annular body 22i.
In other words, if the thickness between the reinforcing bars and the concrete surface is ensured, the outermost annular body 220 and the connecting rod 23 will inevitably end up in the aforementioned narrow gap W, leading to the aforementioned construction difficulties. .
さらに、場合によっては主筋７から突き出てしまう場合
もあり、この場合には実際には現場的に、補強に最も有
効な最外の環状体２２ｏを切断して施工するようなこと
も避けられない。Furthermore, in some cases, it may protrude from the main reinforcement 7, and in this case, it is unavoidable that the outermost annular body 22o, which is most effective for reinforcement, must be cut and constructed on site. .
また、鉄筋コンクリート有孔梁の貫通孔の補強は、前述
のように斜めせん断力に対する補強を行うのが最も有効
であるが、この補強金具では、その点についての配慮が
なく、言わば全方向的に平均して補強力を発揮するよう
にされているので、単位素材（鉄筋）量当りの補強効果
という点では不十分なものである。つまり、一定の補強
効果を得るために要する素材（鉄筋）の量がより多くな
り無駄があり、また重くなる分取扱い性が悪いというこ
とである。In addition, the most effective method for reinforcing through-holes in reinforced concrete perforated beams is to provide reinforcement against diagonal shear forces, as described above, but this reinforcement fitting does not take this into consideration, and is not effective in all directions. Since the reinforcing force is exerted on average, the reinforcing effect per unit material (reinforcing bar) is insufficient. In other words, the amount of material (reinforcing bars) required to obtain a certain reinforcing effect increases, which is wasteful, and the increased weight makes handling difficult.
このような従来の事情に鑑み、当発明者等は、より補強
効果が秀れており、しかも取扱性や施工性についても従
来のもの以上であるような補強構造乃至補強金具の開発
を進めてきた。その結果、到達し得たのがこの発明であ
る。In view of these conventional circumstances, the present inventors have been proceeding with the development of reinforcing structures and reinforcing metal fittings that have superior reinforcing effects and are also easier to handle and construct than conventional ones. Ta. As a result, this invention was achieved.
〈課題を解決するための手段〉
具体的には、この発明では、それぞれ交互に配された長
辺と短辺とを４辺ずつ有する８角形に形成された主補強
筋及び四角形の補助補強筋を用いる鉄筋コンクリート有
孔梁の補強構造であって、主補強筋は、各長辺が梁の長
さ方向に平行する線に対し略４５°となるようにして貫
通孔の周囲に配され、補助補強筋は、その４辺がそれぞ
れ主補強筋の各長辺に対し平行になる状態で主補強筋に
内接せしめられ且つ、少なくとも向かい合う一対の頂点
が主補強筋の短辺に溶接されてなる鉄筋コンクリート有
孔梁の補強構造を特徴する請求項と共にそれに用いる補
強金具として、それぞれ交互に配されそれぞれ略１３５
°の内角を形成する長辺と短辺とを４辺ずつ有する８角
形とされた主補強筋と、４辺がそれぞれ主補強筋の各長
辺に対し平行となる状態で主補強筋に内接せしめられ且
つ、少なくとも向かい合う一対の頂点が主補強筋の短辺
に溶接された四角形の補助補強筋とよりなる補強金具を
提供する。<Means for Solving the Problems> Specifically, in the present invention, main reinforcing bars are formed into an octagonal shape having four long sides and four short sides arranged alternately, and auxiliary reinforcing bars in a quadrangular shape. This is a reinforcement structure for a reinforced concrete perforated beam using The reinforcing bars are inscribed in the main reinforcing bars with their four sides parallel to each long side of the main reinforcing bars, and at least a pair of opposing vertices are welded to the short sides of the main reinforcing bars. Claims featuring a reinforcement structure for reinforced concrete perforated beams and reinforcing metal fittings used therein are alternately arranged and each approximately 135 mm
The main reinforcement has an octagonal shape with four long sides and four short sides that form an interior angle of °. To provide a reinforcing metal fitting made of rectangular auxiliary reinforcing bars that are in contact with each other and have at least a pair of opposing vertices welded to the short sides of the main reinforcing bars.
く作 用〉
この補強構造乃至補強金具では、主補強筋は、上下の各
短辺が主筋に、左右の各短辺があばら筋にそれぞれ平行
とされた状態で貫通孔形成用スリーブの周囲に配され、
その長辺が梁の長さ方向に平行する線に対し略４５°と
なるようにされる。In this reinforcing structure or reinforcing metal fitting, the main reinforcing bars are placed around the through-hole forming sleeve with the upper and lower short sides parallel to the main reinforcing bars, and the left and right short sides parallel to the stirrup bars. arranged,
The long side thereof is set at approximately 45° with respect to a line parallel to the length direction of the beam.
従って、補助補強筋の各辺も梁の長さ方向に平行する線
に対し略４５６となるようになる。その結果、斜めせん
断力に対して主補強筋の長辺と補助補強筋の辺とが協働
して補強力を発揮するので、その補強効果が効率よく発
揮され、従ってより秀れた補強効果を得られることにな
る。Therefore, each side of the auxiliary reinforcing bars also has a width of about 456 with respect to a line parallel to the length direction of the beam. As a result, the long sides of the main reinforcing bars and the sides of the auxiliary reinforcing bars work together to exert a reinforcing force against the diagonal shearing force, so the reinforcing effect is efficiently exerted, resulting in a better reinforcing effect. You will get .
この点をより具体的に説明すると以下の通りである。This point will be explained more specifically as follows.
すなわち、斜めせん断力が加わると斜め方向のせん断ク
ラックが発生しようとするが、このせん断クラックに直
交する主補強筋及び補助補強筋の各辺が引張力を受けて
このせん断クラックの拡がりを押さえる。この際、せん
断クラックに直交する前記各辺に隣り合う各辺は、引張
力を受けず、むしろ引張力を受けている各辺の定着効果
の役目を負うことにより補強効果の向上に協動している
。That is, when a diagonal shear force is applied, a diagonal shear crack tends to occur, but each side of the main reinforcing bar and the auxiliary reinforcing bar perpendicular to the shear crack receives tensile force and suppresses the spread of the shear crack. At this time, each side adjacent to the above-mentioned sides perpendicular to the shear crack does not receive any tensile force, but rather works together to improve the reinforcing effect by acting as a fixing effect for each side that is receiving tensile force. ing.
しかも、隣り合う各辺による定着効果は、補助補強筋の
少なくとも向かい合う一対の頂点が主補強筋の短辺に溶
接されていることにより、定着効果に働く各辺が立体構
造的に一体化してより高められている。つまり、この補
強構造乃至補強金具では、主補強筋及び補助補強筋の各
辺がそれぞれ異なる役目を相互に有機的に協動して負う
ことにより、秀れた補強効果を発揮しているものである
。Moreover, the anchoring effect of each adjacent side is improved because at least a pair of opposing vertices of the auxiliary reinforcing bars are welded to the short sides of the main reinforcing bar, and each side that acts on the anchoring effect is integrated three-dimensionally. It is elevated. In other words, in this reinforcing structure or reinforcing metal fittings, each side of the main reinforcing bars and auxiliary reinforcing bars organically cooperate with each other to take on different roles, thereby demonstrating an excellent reinforcing effect. be.
また、このような補強構造乃至補強金具において、主補
強筋の短辺に向かい合う補助補強筋の隅部に横筋をそれ
ぞれ溶接するようにするとさらに有利となる。In addition, in such a reinforcing structure or reinforcing metal fitting, it is further advantageous to weld the horizontal reinforcements to the corners of the auxiliary reinforcing bars facing the short sides of the main reinforcing bars.
すなわち、前述のように各辺に引張力乃至定着効果とい
う複雑な力が働く際に補助補強筋が歪もうとするが、こ
の歪もうとする傾向を横筋の存在により押さえることが
できるので、より秀れた補強効果かえられる。また、横
筋の存在により貫通孔の周囲の「かぶり厚」がより適性
化されるという点、及びこの「かぶり厚」の適性化に関
連して、貫通孔の回りに生じるおそれのある乾燥による
クラックの防止にも働くという点である。In other words, as mentioned above, the auxiliary reinforcing bars tend to distort when complex forces such as tensile force or anchoring effect are applied to each side, but this tendency to distort can be suppressed by the presence of the horizontal bars, so it is more Excellent reinforcing effect can be obtained. In addition, the presence of horizontal stripes makes the "cover thickness" around the through hole more appropriate, and related to this optimization of the "cover thickness", cracks that may occur around the through hole due to drying are also important. The point is that it also works to prevent.
さらに、この補強構造乃至補強金具は、単に補強効果が
秀れているというだけにとどまらず、長辺と短辺とを４
辺ずつ有する８角形であるため、施工が従来のものに比
べより容易であるという長所、つまり８角形であるため
従来のものと同一の補強効果を得るサイズで比較した場
合に主筋側への拡がりが小さくて済み、必要な「かぶり
厚」を確保しても主補強筋が前述した狭い隙間Ｗにかか
ることがないので施工し易く、また主補強筋の短辺をこ
れに平行するあばら筋に固定することができるので固定
作業を行い易いという長所、あるいは同程度の補強効果
に対して筋の量が従来のものに比べ少なくて済むので、
軽く嵩張らず、保管や運搬においてより取り扱い易いと
いう長所もある。Furthermore, this reinforcing structure or reinforcing metal fittings not only have an excellent reinforcing effect, but also have four long and short sides.
Because it is octagonal with each side, construction is easier than conventional ones.In other words, because it is octagonal, it has the same reinforcement effect as conventional ones.When compared with the size, it spreads to the main reinforcement side. is small, and even if the necessary "cover thickness" is secured, the main reinforcing bars do not overlap the narrow gap W mentioned above, making construction easier. It has the advantage of being easy to fix because it can be fixed, or because it requires less reinforcement than conventional products for the same level of reinforcing effect.
It also has the advantage of being light and not bulky, making it easier to handle when storing and transporting.
く実 施 例〉
以下、この発明の実施例を図面に基づいて説明する。尚
、以下の説明では従来技術に関して説明した事項と共通
する部分及び各実施例に共通する部分には同一符号を付
すにとどめ重複する説明は省略するものとする。Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In the following description, the same reference numerals are given to the parts common to those described in relation to the prior art and the parts common to each embodiment, and redundant description will be omitted.
第」」（施！ｌ（第１図及び第２図）
この実施例の補強構造では、第１図に示される補強金具
１を用いている。1 (FIGS. 1 and 2) In the reinforcing structure of this embodiment, the reinforcing metal fitting 1 shown in FIG. 1 is used.
補強金具１は、主補強筋２、補助補強筋３よりなる。The reinforcing metal fitting 1 consists of main reinforcing bars 2 and auxiliary reinforcing bars 3.
主補強筋２は、それぞれ交互に配された長辺５ａ〜５ｄ
と短辺６ａ〜６ｄとを４辺ずつ有する８角形に形成され
ており、第２図に示すように、上下の各短辺６ａ、６ｃ
が主筋７．７に、左右の各短辺６ｂ、６ｄがあばら筋８
．８にそれぞれ平行になる状態で貫通孔形成用のスリー
ブ９の周囲に配され、梁の長さ方向に平行する線りに対
し各長辺５ａ〜５ｄがそれぞれ略４５°となるようにさ
れる。つまり、長辺５ａ〜５ｄと短辺６ａ〜６ｄとは、
それぞれ１３５°の内角を形成することになる。The main reinforcing bars 2 have long sides 5a to 5d arranged alternately.
It is formed into an octagon having four short sides 6a to 6d, and as shown in FIG.
are the main reinforcements 7.7, and the left and right short sides 6b and 6d are the stirrup reinforcements 8.
．． The long sides 5a to 5d are arranged at an angle of approximately 45° to the line parallel to the length direction of the beam. . In other words, the long sides 5a to 5d and the short sides 6a to 6d are
Each will form an interior angle of 135°.
尚、この際、左右の各短辺６ｂ、６ｄがそれぞれあばら
筋８に接続・固定される。At this time, the left and right short sides 6b and 6d are connected and fixed to the stirrups 8, respectively.
補助補強筋３は、３ａ〜３ｄの４辺を有する四角形に形
成されており、その向かい合う一対の頂点３ｓ、３ｓが
主補強筋２の上下の短辺６ａ１６Ｃすなわちセットした
際に主筋７と平行になる短辺６ａ、６Ｃにそれぞれ溶接
にて接続・固定され、その４辺が主補強筋２の長辺５ａ
〜５ｄに対しそれぞれ平行になる状態となるようにして
主補強筋２に内接せしめられている。尚、他の一対の頂
点についても、後述する第２実施例に示すように、溶接
で固定するようにしてもよい。ただ、この場合には、溶
接による加熱で補助補強筋３の納まりを悪くせにように
配慮する必要がある。The auxiliary reinforcing bars 3 are formed in a rectangular shape having four sides 3a to 3d, and a pair of opposing vertices 3s, 3s are parallel to the upper and lower short sides 6a16C of the main reinforcing bars 2, that is, parallel to the main reinforcing bars 7 when set. It is connected and fixed by welding to the short sides 6a and 6C, respectively, and the four sides are the long sides 5a of the main reinforcing bar 2.
~5d are inscribed in the main reinforcing bars 2 so as to be parallel to each other. Note that the other pair of vertices may also be fixed by welding, as shown in a second embodiment described later. However, in this case, it is necessary to take care to ensure that the auxiliary reinforcing bars 3 do not fit properly due to the heating caused by welding.
補助補強筋３には、横筋１０．１１が溶接されている。Transverse reinforcements 10.11 are welded to the auxiliary reinforcing bars 3.
この横筋１Ｏ１１１は後述するように補強効果の向上に
働くものであるが、特に下方の横筋ｌＯには、スリーブ
受け部ｉｔｓが曲折させて延設されており、スリーブ９
を支持する役目を負うものでる。This horizontal reinforcement 1O111 works to improve the reinforcing effect as will be described later, but in particular, the lower horizontal reinforcement 1O has a sleeve receiving part its bent and extended, and the sleeve 9
It is responsible for supporting the.
このような補強金具１乃至は補強金具ｌを用いた補強構
造の特徴の一つは、主補強筋２が前述のような８角形で
あるという点である。つまり、８角形の各辺の内、梁の
長さ方向に平行する線りに対し略４５″とされる各長辺
５ａ〜５ｄは、それ自体で斜めせん断力に対する最も効
率のよい補強力を持っているし、また主補強筋２の各短
辺６ａ、６ｃに対し補助補強筋３の頂点３ｓ、３ｓが接
続・固定されることにより、補助補強筋３の各辺３ａ〜
３ｄが主補強筋２の各長辺５ａ〜５ｄと緊密に協働して
斜めせん断力に対する、より効率的且つより強力な補強
効果を発揮するという点である。One of the characteristics of the reinforcement structure using such reinforcing metal fittings 1 to 1 is that the main reinforcing bars 2 are octagonal as described above. In other words, among the sides of the octagon, each long side 5a to 5d, which is approximately 45'' with respect to the line parallel to the length direction of the beam, has the most efficient reinforcing force against diagonal shear force by itself. Furthermore, by connecting and fixing the vertices 3s and 3s of the auxiliary reinforcing bars 3 to each of the short sides 6a and 6c of the main reinforcing bars 2, each side 3a to 3 of the auxiliary reinforcing bars 3 is connected and fixed.
3d closely cooperates with each of the long sides 5a to 5d of the main reinforcing bars 2 to exert a more efficient and stronger reinforcing effect against diagonal shear force.
この点をより具体的に説明すると以下の通りである。This point will be explained more specifically as follows.
すなわち、線りに対し略４５°方向の斜めせん断力が加
わると斜め方向のせん断クラックＣが発生しようとする
が、このせん断クラックＣに直交する主補強筋２及び補
助補強筋３の各辺５ａ、５Ｃ及び３ａ、３ｃが引張力を
受けてこのせん断クラックＣの拡がりを押さえる。この
際、せん断クラックＣに直交する前記各辺５ａ、５ｅ及
び３ａ。In other words, when a diagonal shear force in a direction of approximately 45° is applied to the wire, a diagonal shear crack C tends to occur, but each side 5a of the main reinforcing bar 2 and the auxiliary reinforcing bar 3 that is orthogonal to this shear crack C , 5C and 3a, 3c are subjected to tensile force to suppress the spread of this shear crack C. At this time, each of the sides 5a, 5e, and 3a perpendicular to the shear crack C.
３ｃに隣り合う各辺６ａ、５ｂ、６ｃ、５ｄ及び３ｂ、
３ｄは、引張力を受けず、むしろ引張力を受けている各
辺５ａ、５ｃ及び３ａ、３ｃの定着効果の役目を負うこ
とにより補強効果の向上に協動している。しかも、隣り
合う各辺６ａ、５ｂ、６ｃ、５ｄ及び３ｂ、３ｄによる
定着効果は、補助補強筋３の向かい合う一対の頂点３Ｓ
、３Ｓが主補強筋２の短辺６ａ、６ｃに溶接されている
ことにより、定着効果に働く各辺が立体構造的に一体化
してより高められている。つまり、この補強構造乃至補
強金具１では、主補強筋２及び補助補強筋３の各辺がそ
れぞれ異なる役目を相互に有機的に協動して負うことに
より、秀れた補強効果を発揮しているものである。尚、
せん断クラックＣが逆傾斜の場合には、各辺はそれぞれ
前記とは逆の働きをする。Each side 6a, 5b, 6c, 5d and 3b adjacent to 3c,
3d cooperates in improving the reinforcing effect by acting as a fixing effect for each side 5a, 5c and 3a, 3c which are not subjected to tensile force but rather are subjected to tensile force. Moreover, the fixing effect of the adjacent sides 6a, 5b, 6c, 5d and 3b, 3d is the
, 3S are welded to the short sides 6a, 6c of the main reinforcing bars 2, so that each side that acts on the fixing effect is integrated three-dimensionally and is further enhanced. In other words, in this reinforcing structure or reinforcing metal fitting 1, each side of the main reinforcing bars 2 and the auxiliary reinforcing bars 3 plays a different role in organic cooperation with each other, thereby exhibiting an excellent reinforcing effect. It is something that exists. still,
When the shear crack C has a reverse slope, each side has a function opposite to that described above.
また、このような補強構造乃至補強金具ｌにおいて、横
筋１０、ｌｌは以下のような利点をもたらすものである
。Further, in such a reinforcing structure or reinforcing metal fitting 1, the horizontal reinforcements 10 and 11 bring the following advantages.
すなわち、前述のように各辺に引張力乃至定着効果とい
う複雑な力が働く際に補助補強筋３が歪もうとするが、
この歪もうとする傾向を横筋１０．１１の存在により押
さえることができるので、より秀れた補強効果かえられ
る。また、横筋１０．１１の存在により貫通孔の周囲の
「かぶり厚」がより適性化されるという点、及びこの「
かぶり厚」の適性化に関連して、貫通孔の回りに生じる
おそれのある乾燥によるクラックの防止にも働くという
点である。In other words, as mentioned above, when complex forces such as tensile force or anchoring effect are applied to each side, the auxiliary reinforcing bars 3 tend to become distorted.
Since this tendency to distort can be suppressed by the presence of the horizontal stripes 10 and 11, a better reinforcing effect can be obtained. In addition, the existence of the horizontal stripes 10.11 makes the "cover thickness" around the through hole more appropriate, and this "
In connection with optimizing the cover thickness, it also works to prevent cracks caused by drying that may occur around the through holes.
尚、横筋１０，１１はこのように補強効果をより一層向
上させ十分以上の補強力を与えるという役目を負うもの
であるが、必要な補強力を得るという点では必ずしも不
可欠という訳ではなく、これを省略することも可能であ
る。Although the horizontal reinforcements 10 and 11 have the role of further improving the reinforcing effect and providing more than sufficient reinforcing force, they are not necessarily essential in obtaining the necessary reinforcing force; It is also possible to omit.
また、主補強筋２が前述のような８角形であるというこ
とは、単に補強効果の上で秀れているというだけに止ま
らず、施工が従来のものに比べより容易であるという長
所、つまり前述のような８角形であるため従来のものと
同一の補強効果を得るサイズで比較した場合に主筋７側
への拡がりが小さくて済み、上述した必要な「かぶり厚
Ｊを確保しても主補強筋２が上述の狭い隙間Ｗにかかる
ことがないので施工し易く、またあばら筋８に平行する
主補強筋２の短辺６ｂ、６ｄをあばら筋８に固定するこ
とができるので固定作業を行い易いという長所、あるい
は同程度の補強効果に対して筋の量が従来のものに比べ
少なくて済むので、軽く嵩張らず、保管や運搬において
より取り扱い易いという長所もある。Furthermore, the fact that the main reinforcing bars 2 are octagonal as described above not only has an excellent reinforcing effect, but also has the advantage of being easier to construct than conventional ones. Because it is octagonal as mentioned above, when comparing the size to achieve the same reinforcing effect as the conventional one, the expansion to the main reinforcement 7 side is small, and even if the necessary "cover thickness J" mentioned above is secured, the main reinforcement The reinforcing bars 2 do not cross the above-mentioned narrow gap W, so construction is easy, and the short sides 6b and 6d of the main reinforcing bars 2 parallel to the stirrups 8 can be fixed to the stirrups 8, so the fixing work is easy. It has the advantage of being easy to perform, or because it requires less striations than conventional ones for the same level of reinforcing effect, it is lighter and less bulky, making it easier to handle in storage and transportation.
第」口（施童ｌ（第３図）
この実施例に係る補強金具３０は、補助補強筋３１が第
１実施例における横筋１０，１１を備えておらず、代わ
りに接続筋３２ａ〜３２ｄを備えている点、及び補助補
強筋３１の全頂点を主補強筋２の各短辺６ａ〜６ｄのそ
れぞれに溶接しているという点で第１実施例のものとは
異なる。In the reinforcing metal fitting 30 according to this embodiment, the auxiliary reinforcing bars 31 do not have the horizontal bars 10 and 11 in the first embodiment, but instead have connecting bars 32a to 32d. This embodiment differs from the first embodiment in that all the vertices of the auxiliary reinforcing bars 31 are welded to each of the short sides 6a to 6d of the main reinforcing bars 2.
これらの接続筋３２ａ〜３２ｄは、主補強筋２の長辺５
ａ〜５ｄの中間部位と補助補強筋３１の各辺３１ａ〜３
１ｄの中間部位を、各辺５ａ〜５ｄ及び３１ａ〜３１ｄ
が緊密に協働して補強効果を発揮するようにさせるため
に接続するためのもので、補助補強筋３１の各辺に溶接
されているだけでなく、主補強筋２の各辺に対しても溶
接されている。また、４本の接続筋３２ａ〜３２ｄの内
の接続筋３２ｂ、３２ｃは、スリーブ９に対する当接・
位置決め用として他より長く内側へ突出するようにされ
ている。These connecting bars 32a to 32d are connected to the long side 5 of the main reinforcing bar 2.
Intermediate portions a to 5d and each side 31a to 3 of the auxiliary reinforcing bar 31
1d, each side 5a to 5d and 31a to 31d
This is to connect so that the reinforcing bars work closely together to exert a reinforcing effect, and are not only welded to each side of the auxiliary reinforcing bars 31, but also to each side of the main reinforcing bars 2. are also welded. Furthermore, the connecting rods 32b and 32c of the four connecting rods 32a to 32d are in contact with the sleeve 9.
It is designed to protrude inward longer than the others for positioning purposes.
尚、これらの接続筋３２ａ〜３２ｄは、第１実施例にお
ける横筋１０．１１と同様で、補強効果をより一層向上
させるという働きがあるが、同じく必ずしも不可欠とい
う訳ではなく、これを省略することも可能であるし、ま
た必ずしも主補強筋２及び補助補強筋３１の両方に溶接
する必要がなく、主補強筋２及び補助補強筋３１のいず
れか一方だけに溶接するようにしてもよい。Note that these connecting bars 32a to 32d are similar to the horizontal bars 10.11 in the first embodiment, and have the function of further improving the reinforcing effect, but they are not necessarily essential and may be omitted. Also, it is not necessarily necessary to weld to both the main reinforcing bars 2 and the auxiliary reinforcing bars 31, and it is also possible to weld only to either the main reinforcing bars 2 or the auxiliary reinforcing bars 31.
以下に示すのは、この第２実施例の補強金具３０を用い
た鉄筋コンクリート有孔梁の強度試験結果である。Shown below are the strength test results of a reinforced concrete perforated beam using the reinforcing metal fittings 30 of this second embodiment.
試験Ｎα１は、補強金具３０を２か所に用いた場合であ
り、試験Ｎα２は、補強金具３０を３か所に用いた場合
である。数値は、せん断終局耐力についてのもので、計
算値は「広沢式」により求めたものである。Test Nα1 is a case where reinforcing metal fittings 30 are used at two places, and test Nα2 is a case where reinforcing metal fittings 30 are used at three places. The numerical values are for the ultimate shear strength, and the calculated values were obtained using the "Hirosawa formula."
この結果は、従来のものに比べて２０〜３０％高い補強
効果があるものと理解できる。This result can be understood as having a reinforcing effect that is 20 to 30% higher than that of the conventional one.
〈発明の効果〉
この発明に係る鉄筋コンクリート有孔梁の補強構造及び
それに用いる補強金具は、以上説明してきた如きものな
ので、以下のような効果を有する。<Effects of the Invention> Since the reinforcing structure for a reinforced concrete perforated beam and the reinforcing metal fittings used therein according to the present invention are as described above, they have the following effects.
（ａ）斜めせん断力に対し最も強力に補強力を発揮する
ので、最も効率のよい補強効果を得られる。(a) Since it exhibits the strongest reinforcing force against diagonal shear force, the most efficient reinforcing effect can be obtained.
（ｂ）斜めせん断力に対して主補強筋の各長辺と補助補
強筋の各辺とが緊密に協働して補強力を発揮するので、
より強力な補強効果を得られる。(b) Each long side of the main reinforcement and each side of the auxiliary reinforcement work closely together to exert reinforcing force against diagonal shear force.
A stronger reinforcing effect can be obtained.
（Ｃ１施工が従来のものに比べより容易である。(C1 construction is easier than conventional construction.
（ｄ）同程度の補強効果に対しては筋の量が従来のもの
より少なくて済むのでその分、軽く嵩張らず、保管や運
搬において取り扱い易い。(d) For the same level of reinforcing effect, the amount of striations is smaller than in conventional products, so it is lighter and less bulky, making it easier to handle in storage and transportation.
第１図は、第１実施例による補強金具の概略側面図、
第２図は、第１実施例の補強金具が組み付けられた鉄筋
の概略側面図、
第３図は、第２実施例による補強金具の概略側面図、
第４図は、従来の補強金具を鉄筋に組み付けた状態を示
す概略側断面図、そして
第５図は、第４図中の矢示Ｖ方向みた概略側面図である
。
１１３０−・・・・補強金具
２−・・・・主補強筋
３．３工・−・・・・−・補助補強筋
３ａ〜３ｄ・−・・・・・辺
５ａ〜５ｄ−・・・・・・−長辺
６ａ〜６ｃｌ−・・・・・・短辺
９−・・・・・・−スリーブ
１０．１１・・・・・・−横筋
３図Fig. 1 is a schematic side view of a reinforcing metal fitting according to the first embodiment, Fig. 2 is a schematic side view of a reinforcing bar to which the reinforcing metal fitting of the first embodiment is assembled, and Fig. 3 is a schematic side view of reinforcing metal fittings according to the second embodiment. FIG. 4 is a schematic side sectional view showing a state in which a conventional reinforcing metal fitting is assembled to reinforcing bars, and FIG. 5 is a schematic side view taken in the direction of arrow V in FIG. 4. 1130-...Reinforcement fittings 2-...Main reinforcing bars 3.3--Auxiliary reinforcing bars 3a-3d--Sides 5a-5d-- ...-Long side 6a to 6cl--Short side 9--Sleeve 10.11--Horizontal strip 3
Claims (4)
有する８角形に形成された主補強筋及び四角形の補助補
強筋を用いる鉄筋コンクリート有孔梁の補強構造であっ
て、 主補強筋は、各長辺が梁の長さ方向に平行する線に対し
略４５°となるようにして貫通孔の周囲に配され、 補助補強筋は、その４辺がそれぞれ主補強筋の各長辺に
対し平行になる状態で主補強筋に内接せしめられ且つ、
少なくとも向かい合う一対の頂点が主補強筋の短辺に溶
接されていることを特徴とする鉄筋コンクリート有孔梁
の補強構造。(1) A reinforcement structure for a reinforced concrete perforated beam using main reinforcement bars formed in an octagonal shape and quadrangular auxiliary reinforcement bars each having four long sides and four short sides arranged alternately, the main reinforcement The reinforcing bars are arranged around the through hole so that each long side is approximately 45° to a line parallel to the length direction of the beam, and the auxiliary reinforcing bars have four sides that are parallel to each length of the main reinforcing bars. It is inscribed in the main reinforcing bar in a state parallel to the side, and
A reinforced concrete perforated beam reinforcement structure characterized in that at least a pair of opposing vertices are welded to the short sides of the main reinforcing bars.
辺に向かい合う各隅部において横筋が溶接され且つ、下
方の横筋にはスリーブ受け部が延設されていることを特
徴とする請求項（１）記載の鉄筋コンクリート有孔梁の
補強構造。(2) A claim characterized in that the auxiliary reinforcing bars have transverse reinforcements welded to them at least at each corner facing both the upper and lower short sides of the main reinforcing bars, and a sleeve receiving portion extends to the lower transverse reinforcements. Reinforcement structure of reinforced concrete perforated beam described in item (1).
を形成する長辺と短辺とを４辺ずつ有する８角形とされ
た主補強筋と、 ４辺がそれぞれ主補強筋の各長辺に対し平行となる状態
で主補強筋に内接せしめられ且つ、少なくとも向かい合
う一対の頂点が主補強筋の短辺に溶接された四角形の補
助補強筋とよりなる補強金具。(3) Main reinforcing bars each having an octagonal shape with four long sides and four short sides that are arranged alternately and forming an interior angle of approximately 135°, and four sides are each on each long side of the main reinforcing bars. A reinforcing metal fitting comprising a rectangular auxiliary reinforcing bar that is inscribed in the main reinforcing bar in a state parallel to the main reinforcing bar and at least a pair of opposing vertices are welded to the short sides of the main reinforcing bar.
対の隅部に横筋が各々溶接され且つ、一方の横筋にはス
リーブ受け部が延設されていることを特徴とする請求項
（３）記載の補強金具。(4) Claim (3) characterized in that horizontal reinforcements are welded to at least a pair of opposite corners of the corners of the auxiliary reinforcing bars, and a sleeve receiving portion extends to one of the horizontal reinforcements. Reinforcement fittings listed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29015588 | 1988-11-18 | ||
| JP63-290155 | 1988-11-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02225750A true JPH02225750A (en) | 1990-09-07 |
| JPH083236B2 JPH083236B2 (en) | 1996-01-17 |
Family
ID=17752479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1155705A Expired - Lifetime JPH083236B2 (en) | 1988-11-18 | 1989-06-20 | Reinforcement structure of reinforced concrete perforated beam and reinforcing metal fittings used therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH083236B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0649620U (en) * | 1992-04-28 | 1994-07-08 | 平尾鉄建株式会社 | Reinforcement member of reinforced concrete structure with through hole |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5908518B2 (en) * | 2014-03-27 | 2016-04-26 | 大和ハウス工業株式会社 | Reinforcing structure for openings in RC beams |
| JP7370577B2 (en) * | 2019-11-08 | 2023-10-30 | コーリョー建販株式会社 | Reinforcement fittings and reinforcement structure for reinforced concrete perforated beams |
-
1989
- 1989-06-20 JP JP1155705A patent/JPH083236B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0649620U (en) * | 1992-04-28 | 1994-07-08 | 平尾鉄建株式会社 | Reinforcement member of reinforced concrete structure with through hole |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH083236B2 (en) | 1996-01-17 |
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