JPS6114296B2 - - Google Patents
Info
- Publication number
- JPS6114296B2 JPS6114296B2 JP7830181A JP7830181A JPS6114296B2 JP S6114296 B2 JPS6114296 B2 JP S6114296B2 JP 7830181 A JP7830181 A JP 7830181A JP 7830181 A JP7830181 A JP 7830181A JP S6114296 B2 JPS6114296 B2 JP S6114296B2
- Authority
- JP
- Japan
- Prior art keywords
- plate
- concrete
- linear
- linear plate
- reinforcing 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.)
- Expired
Links
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000002265 prevention Effects 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002788 crimping Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Reinforcement Elements For Buildings (AREA)
Description
【発明の詳細な説明】
本発明は、コンクリート壁における開口部隅角
部の亀裂防止構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for preventing cracks at the corners of openings in concrete walls.
コンクリート壁における開口部隅角部の亀裂
は、コンクリートの乾燥収縮が主な要因となつて
発生する。この対策としては、混和剤の使用等、
コンクリートの調合設計によりコンクリート自身
の収縮量を減少する方法と、開口部隅角部に集中
する応力を分散する方法とがある。後者の方法と
しては、開口部隅角部に補強鉄筋を斜めに、つま
り、開口部隅角部の二等分線に略直交する方向
（これはコンクリートの乾燥収縮により生じる引
張力の方向である。）に埋設するのが最も一般的
であり、多くの建物に採用されているが、充分な
効果を得られないケースがある。 Cracks at the corners of openings in concrete walls occur mainly due to drying shrinkage of the concrete. Measures against this include the use of admixtures, etc.
There are two methods: one is to reduce the amount of shrinkage of the concrete itself through concrete mix design, and the other is to disperse stress concentrated at the corners of the opening. The latter method involves installing reinforcing bars at the corner of the opening diagonally, that is, in a direction approximately perpendicular to the bisector of the corner of the opening (this is the direction of the tensile force generated by drying shrinkage of the concrete). ) is the most common method, and is used in many buildings, but there are cases where the desired effect is not achieved.
その原因としては、局部的に集中する収縮によ
る引張応力がコンクリートの付着力を上まわり、
鉄筋の長さのある範囲にわたつて滑りを生じてい
ることが考えられる。即ち、鉄筋断面の許容応力
度はコンクリートの乾燥収縮による引張応力より
も充分に大きく、鉄筋の伸びや破断よりもむしろ
コンクリートの付着力が不足して鉄筋との滑りが
発生していると考えられる。 The reason for this is that the tensile stress due to locally concentrated shrinkage exceeds the adhesion of the concrete.
It is possible that slipping occurs over a certain length range of the reinforcing bars. In other words, the allowable stress level of the cross section of the reinforcing bars is sufficiently larger than the tensile stress due to drying shrinkage of the concrete, and it is thought that slipping with the reinforcing bars occurs due to insufficient adhesion of the concrete rather than elongation or breakage of the reinforcing bars. .
このような考察に基づき、本発明は、コンクリ
ートとの有効な付着面積の大きいエキスパンドメ
タルと異形鉄筋とが複合された亀裂防止金物を用
いて、より高い亀裂防止効果を得ようとするもの
である。 Based on such considerations, the present invention aims to obtain a higher crack prevention effect by using crack prevention hardware that is a composite of expanded metal and deformed reinforcing bars that have a large effective adhesion area to concrete. .
以下、本発明の実施例を図面に基づいて詳述す
る。 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
第１図は本発明に係るコンクリート壁における
開口部Ａの隅角部の亀裂防止構造を示し亀裂防止
用金物Ｂが開口部隅角部に、その二等分線と略直
交する状態に埋設されている。 Fig. 1 shows a crack prevention structure at the corner of an opening A in a concrete wall according to the present invention, and a crack prevention hardware B is buried in the corner of the opening in a state substantially perpendicular to the bisector thereof. ing.
前記金物Ｂは、第２図、第３図に示すように互
いに２本の直線状板部１……と、これら両直線状
板部１…間にわたつて位置する互いに平行で且つ
前記直線状板部１……の長手方向に対して直角な
板面を有する複数のつなぎ板部２……と、前記各
直線状板部１……から巾方向外方へ突出した複数
の突出板部３…とを有するエキスパンドメタル４
と、前記直線状板部１……に沿わせ且つ一部の
（例えば、１つおきに位置する）突出板部３……
を巻付けてカシメ（圧着）により固定した２本の
異形鉄筋５……とを備え、異形鉄筋５……に巻付
けない他の突出板部３……には、捻り加工を行な
つて前記直線状板部１……の長手方向に対して直
角な板面を有せしめたものであり、次のようにし
て製造される。 As shown in FIGS. 2 and 3, the hardware B includes two linear plate portions 1... and two linear plate portions 1 that are parallel to each other and located between these linear plate portions 1... A plurality of connecting plate parts 2 having plate surfaces perpendicular to the longitudinal direction of the plate part 1..., and a plurality of protruding plate parts 3 protruding outward in the width direction from each of the linear plate parts 1... Expanded metal 4 with...
and some (for example, located every other) protruding plate parts 3 along the linear plate parts 1...
Two deformed reinforcing bars 5 are wound around and fixed by crimping (crimping), and the other protruding plate portions 3 that are not wrapped around the deformed reinforcing bars 5 are twisted. The linear plate portion 1 has a plate surface perpendicular to the longitudinal direction, and is manufactured as follows.
即ち、第４図に示すように、巾広の鉄板６に、
鉄板６の長手方向に対して適当な角度で傾斜し且
つ鉄板６長手方向に断続した切欠ａ……と、これ
らの切欠ａ……と逆方向に傾斜し且つ鉄板６長手
方向に断続した切欠ｂ……と、切欠ｂ……間に位
置する切欠ｃ……とを形成して、切欠ｂ，ｃにて
分離される鉄板部分６′を取り出す。 That is, as shown in FIG. 4, on a wide iron plate 6,
Notches a that are inclined at an appropriate angle with respect to the longitudinal direction of the iron plate 6 and are interrupted in the longitudinal direction of the iron plate 6, and notches b that are inclined in the opposite direction to these notches a and are interrupted in the longitudinal direction of the iron plate 6. . . . and a notch c located between the notches b and .
次に、第５図、第６図に示すように、切欠ｂ…
…と切欠ａ……間に形成される直線状板部１に沿
つて各々異形鉄筋５……を配置し、切欠ｂ……，
ｃ……によつて形成される突出板部３……のう
ち、適当な位置にある突出板部３を各々異形鉄筋
５……に巻付け、カシメ（圧着）により異形鉄筋
５……に固定する。 Next, as shown in FIGS. 5 and 6, the notch b...
Deformed reinforcing bars 5... are arranged along the linear plate portion 1 formed between... and notch a..., and notch b...,
Among the protruding plate portions 3 formed by c..., the protruding plate portions 3 at appropriate positions are each wrapped around the deformed reinforcing bars 5... and fixed to the deformed reinforcing bars 5... by caulking (crimping). do.
次に、第５図の矢印方向に引き延ばして、異形
鉄筋５……が一体化されている直線状板部１……
間に前記つなぎ板部２……を形成し、しかる後、
異形鉄筋５……に巻付けていない他の突出板部３
……を直線状板部１……から直角に外方へ折り曲
げると共に、直線状板部１の長手方向と直交する
板面をもつように捻り加工することによつて、前
記金物Ｂを構成したのである。 Next, it is stretched in the direction of the arrow in FIG.
The connecting plate portion 2 is formed in between, and then,
Other protruding plate parts 3 that are not wrapped around the deformed reinforcing bars 5...
The hardware B was constructed by bending the straight plate part 1 outward at right angles and twisting it so that the plate surface was perpendicular to the longitudinal direction of the straight plate part 1. It is.
尚、異形鉄筋５……に巻付けない他の突出板部
１……の捻り加工を省略して実施してもよい。 Incidentally, the twisting process of the other protruding plate parts 1 which are not wound around the deformed reinforcing bars 5 may be omitted.
本発明は、上述の構成よりなり、亀裂防止用金
物が異形鉄筋とエキスパンドメタルとを複合した
ものであるから、コンクリートとの付着面積が大
きく、殊に、つなぎ板部は直線状板部と略直角な
板面を有し、この板面がコンクリートの乾燥収縮
による引張力の方向に対しては略直角となるの
で、これらがコンクリートの抵抗になつてコンク
リートからエキスパンドメタルへの力の伝達が確
実に行なわれ、力の分散が確実で、コンクリート
との滑りの発生を防止できる。 The present invention has the above-mentioned configuration, and since the crack prevention hardware is a composite of deformed reinforcing bars and expanded metal, the area of adhesion to concrete is large, and in particular, the connecting plate portion is approximately a straight plate portion. It has a perpendicular plate surface, and since this plate surface is approximately perpendicular to the direction of the tensile force due to drying shrinkage of the concrete, these act as resistance for the concrete and ensure the transmission of force from the concrete to the expanded metal. This is done to ensure that the force is dispersed and to prevent slipping from occurring with the concrete.
従つて、開口部隅角部の亀裂発生の防止効果を
著しく向上できる。また、異形鉄筋としては断面
積の小さいもので足り、全体として少ない鋼材量
で上記の効果が得られる。 Therefore, the effect of preventing the occurrence of cracks at the corners of the opening can be significantly improved. Furthermore, it is sufficient to use deformed reinforcing bars with a small cross-sectional area, and the above effects can be obtained with a small amount of steel material as a whole.
図面は本発明の実施例を示し、第１図は概略構
成図、第２図は亀裂防止用金物の正面図、第３図
はその断面図、第４図、第５図は夫々製造方法を
示す正面図、第６図は第５図の−線矢視図で
ある。
Ａ……開口部、Ｂ……亀裂防止用金物、１……
直線状板部、２……つなぎ板部、３……突出板
部、４……エキスパンドメタル、５……異形鉄
筋。
The drawings show an embodiment of the present invention; FIG. 1 is a schematic configuration diagram, FIG. 2 is a front view of the crack-preventing hardware, FIG. 3 is a sectional view thereof, and FIGS. 4 and 5 each show a manufacturing method. The front view shown in FIG. 6 is a view taken along the - line in FIG. 5. A...Opening, B...Crack prevention hardware, 1...
Linear plate part, 2... Connecting plate part, 3... Projecting plate part, 4... Expanded metal, 5... Deformed reinforcing bar.
Claims (1)
直線状板部間にわたつて位置する互いに平行で且
つ前記直線状板部の長手方向に対して直角な板面
を有する複数のつなぎ板部と、前記各直線状板部
から巾方向外方へ突出した突出板部とを有するエ
キスパンドメタルと、前記直線状板部に沿わせ且
つ前記突出板部を巻付けて固定した２本の異形鉄
筋とからなる亀裂防止用金物を、コンクリート壁
における開口部隅角部に、前記直線状板部が開口
部隅角部の二等分線と略直交する状態に埋設して
あることを特徴とするコンクリート壁における開
口部隅角部の亀裂防止構造。1. Two linear plate parts parallel to each other, and a plurality of connecting plates located between these linear plate parts and having plate surfaces that are parallel to each other and perpendicular to the longitudinal direction of the linear plate parts. and a protruding plate portion protruding outward in the width direction from each of the linear plate portions, and two irregularly shaped pieces fixed along the linear plate portions and wrapped around the protruding plate portions. A crack-prevention hardware made of reinforcing steel is embedded in a corner of an opening in a concrete wall in such a manner that the linear plate is substantially orthogonal to a bisector of the corner of the opening. A structure to prevent cracks at the corners of openings in concrete walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7830181A JPS57193648A (en) | 1981-05-23 | 1981-05-23 | Crack preventing structure of opening part corner part in concrete wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7830181A JPS57193648A (en) | 1981-05-23 | 1981-05-23 | Crack preventing structure of opening part corner part in concrete wall |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57193648A JPS57193648A (en) | 1982-11-29 |
| JPS6114296B2 true JPS6114296B2 (en) | 1986-04-18 |
Family
ID=13658094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7830181A Granted JPS57193648A (en) | 1981-05-23 | 1981-05-23 | Crack preventing structure of opening part corner part in concrete wall |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57193648A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0647856B2 (en) * | 1985-07-24 | 1994-06-22 | 東急建設株式会社 | Reinforcement |
| CN110158858B (en) * | 2018-02-13 | 2021-09-28 | 林志成 | Window corner structure wall surface anti-cracking element |
-
1981
- 1981-05-23 JP JP7830181A patent/JPS57193648A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57193648A (en) | 1982-11-29 |
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