JP2948737B2 - Drying shrinkage crack-inducing joint treatment method for concrete - Google Patents
Drying shrinkage crack-inducing joint treatment method for concreteInfo
- Publication number
- JP2948737B2 JP2948737B2 JP23875394A JP23875394A JP2948737B2 JP 2948737 B2 JP2948737 B2 JP 2948737B2 JP 23875394 A JP23875394 A JP 23875394A JP 23875394 A JP23875394 A JP 23875394A JP 2948737 B2 JP2948737 B2 JP 2948737B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- crack
- reinforcing bar
- inducing
- joint
- 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 - Lifetime
Links
- 239000004567 concrete Substances 0.000 title claims description 51
- 230000001939 inductive effect Effects 0.000 title claims description 40
- 238000001035 drying Methods 0.000 title claims description 5
- 238000000034 method Methods 0.000 title claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 64
- 238000005336 cracking Methods 0.000 claims description 6
- 101100008049 Caenorhabditis elegans cut-5 gene Proteins 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 238000007689 inspection Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000004040 coloring Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 101100008050 Caenorhabditis elegans cut-6 gene Proteins 0.000 description 1
- 206010012239 Delusion Diseases 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 231100000868 delusion Toxicity 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Building Environments (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鉄筋が埋設された床あ
るいは壁等のコンクリート構造物における乾燥収縮ひび
割れ対策のため、コンクリート表面にひび割れ誘発目地
部が設けられたコンクリートの乾燥収縮ひび割れ誘発目
地部の処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for inducing dry shrinkage cracking of concrete having a crack inducing joint on the concrete surface in order to prevent dry shrinkage cracks in concrete structures such as floors or walls in which reinforcing bars are embedded. The processing method of the section.
【０００２】[0002]
【従来の技術】日本建築学会「鉄筋コンクリート造のひ
び割れ対策設計；施工指針・同解説」によると、ひび割
れ誘発目地部のひび割れ集中率を高めるため、目地部で
区切られた面積が２５ｍ2 以下で、その長辺／短辺の比
（辺長比）が１．５以下になるようにし、さらに目地部
に沿う剪断力を期待しない場合はひび割れ誘発目地部に
直交横断する鉄筋の約半数を切断するような施工を推奨
している。2. Description of the Related Art According to the Architectural Institute of Japan, "Design for crack prevention in reinforced concrete; Construction guidelines and explanations", the area divided by joints should be 25 m 2 or less in order to increase the crack concentration rate at crack-induced joints. The ratio of the long side / short side (side length ratio) is set to 1.5 or less, and if no shearing force along the joints is expected, about half of the reinforcing bars orthogonal to the crack-inducing joints are cut. Such construction is recommended.
【０００３】これらを詳述すると、図６はコンクリート
床構造物に縦横にひび割れ誘発目地部３、３が設けられ
た例であり、図６（Ａ）に示すように、大梁９とこれに
交差する小梁１０および図示しない鉄筋が埋設されてい
る。ひび割れ誘発目地部３、３の辺長比Ｌ2 ／Ｌ1 が
１．５以下、目地部で区切られた面積Ｌ2 ×Ｌ1 が２５
ｍ2 以下となるように施工されている。図６（Ｂ）に示
すように、ひび割れ誘発目地部３は幅約３ｍｍ、深さ約
２０ｍｍの細溝を、コンクリート打設後に円板カッター
等により刻設される。More specifically, FIG. 6 shows an example in which crack-inducing joints 3 and 3 are provided on a concrete floor structure both vertically and horizontally. As shown in FIG. A small beam 10 and a reinforcing bar (not shown) are buried. The side length ratio L 2 / L 1 of the crack-inducing joints 3, 3 is 1.5 or less, and the area L 2 × L 1 divided by the joints is 25.
m 2 is construction as to become less. As shown in FIG. 6 (B), the crack-inducing joint portion 3 is formed with a narrow groove having a width of about 3 mm and a depth of about 20 mm by a disc cutter or the like after casting concrete.
【０００４】図７はコンクリート壁構造物に縦横にひび
割れ誘発目地部３、３が設けられた例であり、図７
（Ａ）に示すように、柱１２とこれに交差する小梁１０
および図示しない鉄筋が埋設されている。ひび割れ誘発
目地部３、３の辺長比Ｌ／Ｈが１．５以下、目地部で区
切られた面積Ｌ×Ｈが２５ｍ2 以下となるように施工さ
れている。図７（Ｂ）（Ｃ）に示すように、ひび割れ誘
発目地部３は壁の両側あるいは外側に幅約２０〜３０ｍ
ｍ、深さ約２０ｍｍの溝として刻設され、コンクリート
打設時に目地棒等を埋設しておくことにより形成され
る。なお、７はひび割れ誘発目地部に防水のために設け
たシーリングー材等を示している。図７（Ａ）（Ｄ）に
示すように、一般にひび割れ誘発目地部３は柱の両側部
や壁の窓部分の隅部や中央部に位置して設けられ、あま
り目立つことがないデザインとされる。FIG. 7 shows an example in which crack-inducing joints 3, 3 are provided vertically and horizontally on a concrete wall structure.
(A) As shown in FIG.
And a not-shown reinforcing bar is buried. It is constructed so that the side length ratio L / H of the crack-inducing joints 3 and 3 is 1.5 or less, and the area L × H divided by the joints is 25 m 2 or less. As shown in FIGS. 7B and 7C, the crack-inducing joint portion 3 has a width of about 20 to 30 m on both sides or outside of the wall.
It is engraved as a groove having a depth of about 20 mm and a depth of about 20 mm, and is formed by embedding a joint rod or the like when casting concrete. Reference numeral 7 denotes a sealing material or the like provided for waterproofing at the crack-inducing joint. As shown in FIGS. 7A and 7D, the crack-inducing joints 3 are generally provided at both sides of the column and at the corners and the center of the window of the wall, and are designed to be less noticeable. You.
【０００５】図８は埋設鉄筋２とひび割れ誘発目地部３
との関係を示すもので、図８（Ａ）はひび割れ誘発目地
部３に直交横断する鉄筋２がコンクリート乾燥時の収縮
によって受ける応力の状態を示したもので、コンクリー
ト１の収縮によってひび割れ誘発目地部３にひび割れ８
が発生すると、該ひび割れ８部を中心にしてその近傍で
鉄筋２とコンクリート１との付着が回避されて、その区
間の鉄筋２が伸び、鉄筋２には局部的に大きな引張応力
が生じることになる。FIG. 8 shows a buried reinforcing bar 2 and a crack-inducing joint 3.
FIG. 8 (A) shows the state of stress applied to the reinforcing bar 2 orthogonally crossing the crack-inducing joint portion 3 due to shrinkage during drying of the concrete, and FIG. Crack 8 in part 3
When the cracks occur, adhesion of the reinforcing bar 2 and the concrete 1 is avoided in the vicinity of the crack 8 and the reinforcing bar 2 in that section is elongated, and a large tensile stress is locally generated in the reinforcing bar 2. Become.
【０００６】[0006]
【発明が解決しようとする課題】ところが、このような
ひび割れ誘発目地部３を設けても現実にはひび割れ誘発
目地部以外で有害なひび割れ（幅０．３ｍｍ以上）が発
生する場合がある。その原因として、前記ひび割れ８部
を中心にしたその近傍での鉄筋２とコンクリート１との
付着が回避されるのみでは、鉄筋２が伸びる区間が僅か
であり、この僅かの区間以外の鉄筋２に付着しているコ
ンクリート１が該鉄筋と挙動を共にする結果、ひび割れ
誘発目地部３におけるひび割れの促進を抑制しているた
めと考えられる。このため図８（Ｂ）に示したように、
ひび割れ誘発目地部３に直交横断する鉄筋２に対して１
本おきに切断部１１Ａを有する鉄筋１１を配筋して、鉄
筋の引張り強さによるひび割れ拡大に対する抵抗を減少
させ、結果として、ひび割れ誘発目地部３における鉄筋
２とコンクリート１との付着が回避される区間が長くな
るように施工している。しかしながら、切断部１１Ａを
有する切断鉄筋１１の配筋は床や壁の構造耐力を低下さ
せ、好ましいことではなかった。さらに、鉄筋２とコン
クリート１との付着が回避される区間も鉄筋までひび割
れが生じた場合、研究から推定される長さは約６０〜９
０ｍｍ程度であり、鉄筋に切断部を設けても、ひび割れ
誘発目地部におけるひび割れの促進効果が充分とは言い
難かった。However, even when such a crack-inducing joint 3 is provided, harmful cracks (0.3 mm or more in width) may actually occur in areas other than the crack-inducing joint. As a cause thereof, if the adhesion between the reinforcing bar 2 and the concrete 1 around the crack 8 is only avoided, the section where the reinforcing bar 2 extends is small, and the reinforcing bar 2 other than this small section is It is considered that as a result of the behavior of the attached concrete 1 together with the reinforcing bar, the promotion of cracks in the crack-inducing joint 3 is suppressed. Therefore, as shown in FIG.
1 for rebar 2 crossing orthogonally to crack-inducing joint 3
Reinforcing bars 11 having cutting portions 11A are arranged every other to reduce the resistance to crack propagation due to the tensile strength of the reinforcing bars. As a result, adhesion between the reinforcing bar 2 and the concrete 1 at the crack-inducing joint 3 is avoided. Is constructed so that the length of the section is longer. However, the arrangement of the cutting reinforcing bars 11 having the cutting portions 11A is not preferable because it lowers the structural strength of floors and walls. Further, in the section where the adhesion between the reinforcing bar 2 and the concrete 1 is avoided, if the reinforcing bar is cracked, the length estimated from the study is about 60 to 9
It was about 0 mm, and it was difficult to say that the effect of promoting cracking at the crack-inducing joint was sufficient even if a cut portion was provided in the reinforcing bar.
【０００７】このため、ひび割れ誘発目地部におけるひ
び割れを促進してひび割れ集中率を高めると同時に強度
も確保したものとして、切断部のない鉄筋のひび割れ誘
発目地部を横断する部分にテープを巻いたり、塗料を塗
布して、この部分における鉄筋とコンクリートとの付着
を回避することにより、前記ひび割れ誘発目地部のひび
割れ集中率を高めることが案出された。ところが、建築
現場での長尺鉄筋へのテープ巻き作業や塗装作業は多大
の時間と労力を要し、きわめて施工性に劣るものであっ
た。For this reason, assuming that the cracks are promoted at the crack-inducing joints to increase the crack concentration rate and at the same time to secure the strength, a tape may be wound around a portion of the rebar having no cut portion that crosses the crack-inducing joints. It has been devised to increase the crack concentration rate at the crack-inducing joint by applying a paint to avoid the adhesion between the reinforcing bar and the concrete at this portion. However, tape winding work and painting work on a long reinforcing bar at a construction site required a great deal of time and labor, and the workability was extremely poor.
【０００８】そこで、本発明では上記したような従来の
諸課題を解決して、床あるいは壁等の構造物としての充
分な強度を確保しながら、ひび割れ誘発目地部における
ひび割れ集中率を高めることができ、しかも、きわめて
施工性に優れるとともに品質管理が容易なコンクリート
の乾燥収縮ひび割れ誘発目地部の処理方法を提供するも
のである。In view of the above, the present invention has been made to solve the above-mentioned conventional problems and to increase the crack concentration rate at a crack-inducing joint while securing sufficient strength as a structure such as a floor or a wall. It is an object of the present invention to provide a method of treating a joint which induces drying shrinkage and cracking of concrete, which is excellent in workability and easy in quality control.
【０００９】[0009]
【課題を解決するための手段】このため本発明は、鉄筋
が埋設された床、あるいは壁等のコンクリート構造物に
おける、コンクリートの乾燥収縮ひび割れ対策のため、
コンクリート表面にひび割れ誘発目地部が設けられたコ
ンクリート目地部の処理方法において、前記コンクリー
ト表面の目地部を横断する鉄筋に、適宜の長さの筒状カ
バーを装着して、この部分における鉄筋とコンクリート
との付着を回避させ、前記目地部のひび割れを促進する
ように構成したことを特徴とするものである。SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for preventing concrete from drying and shrinking cracks in a concrete structure such as a floor or a wall in which a reinforcing bar is embedded.
In a method for treating a concrete joint having a crack-inducing joint on a concrete surface, a cylindrical cover having an appropriate length is attached to a reinforcing bar traversing the joint on the concrete surface, and the reinforcing bar and concrete in this portion are attached. The joint is prevented from adhering, and the joint is promoted to crack.
【００１０】[0010]
【作用】本発明では、コンクリート表面の目地部３を横
断する鉄筋２に、適宜の長さの筒状カバー４を装着し
て、この部分における鉄筋２とコンクリート１との付着
を回避させ、前記目地部３のひび割れを促進するように
構成したので、前記筒状カバー４の存在によって、この
区間において予め鉄筋２とコンクリート１との付着が回
避されているので、筒状カバー４が無い場合と比べ、筒
状カバーの長さ分だけ長く伸びる。したがって、ひび割
れ誘発目地部３におけるひび割れ集中率を充分に高める
ことができるので、ひび割れ誘発目地部３以外の部分に
おける有害なひび割れの発生を抑制することができる。
しかも、本発明では、鉄筋２とコンクリート１との付着
の回避区間の確保のために鉄筋を切断することもなく、
単に鉄筋２に軸方向の切れ目５を有する適宜の長さの筒
状カバー４を装着するのみの簡単な作業で済み、建築現
場での施工性がきわめて高いものでありながら、コンク
リート構造物としての強度も充分に確保でき、構造耐力
が向上するものである。そして、筒状カバー４を単に鉄
筋２に装着するのみの作業であることから、誤装着時の
やり直しが容易である。また、筒状カバー４の着色等に
より、所要部位への配分や点検、検査等の品質管理がし
やすく、床や壁等の構造物としての品質の向上に大きく
寄与できる。According to the present invention, a cylindrical cover 4 having an appropriate length is attached to a reinforcing bar 2 crossing a joint 3 on a concrete surface to prevent the reinforcing bar 2 from adhering to the concrete 1 at this portion. Since the joints 3 are configured to promote cracking, the presence of the cylindrical cover 4 prevents adhesion of the reinforcing bar 2 and the concrete 1 in this section in advance in this section. In comparison, it extends longer by the length of the cylindrical cover. Therefore, the crack concentration rate at the crack-inducing joint 3 can be sufficiently increased, so that the occurrence of harmful cracks in portions other than the crack-inducing joint 3 can be suppressed.
Moreover, according to the present invention, the reinforcing bar 2 is not cut to secure a section for avoiding the adhesion between the reinforcing bar 2 and the concrete 1,
It is a simple operation of simply attaching the cylindrical cover 4 of an appropriate length having the cut 5 in the axial direction to the reinforcing bar 2, and the workability at the building site is extremely high, while the workability at the construction site is extremely high. The strength can be sufficiently secured, and the structural strength is improved. And since it is the work which only attaches the cylindrical cover 4 to the reinforcing bar 2, it is easy to redo at the time of erroneous attachment. In addition, the coloring of the cylindrical cover 4 and the like facilitates quality control such as distribution to a required portion, inspection, inspection, and the like, and greatly contributes to improvement in quality as a structure such as a floor or a wall.
【００１１】[0011]
【実施例】以下本発明の実施例を図面に基づいて説明す
る。図１および図２は本発明の第１実施例で、図１は鉄
筋２がコンクリート１表面にひび割れ誘発目地部３を設
けた状態の概略を示し、図２は筒状カバー４が鉄筋２に
装着された状態を示している。図１（Ａ）（Ｂ）はコン
クリート壁の断面で、コンクリート打設前の施工時に、
鉄筋２のひび割れ誘発目地部３を横断する部分に軸方向
の切れ目５を有する適宜の長さの筒状カバー４を装着し
たものである。筒状カバー４としては、コンクリート１
と付着性のないものとして、コスト的にも樹脂製のもの
が適当であるが、筒状カバー４と鉄筋２との間の相対移
動が可能であれば必ずしも樹脂製である必要はない。筒
状カバー４を鉄筋２に装着するには、前記筒状カバー４
の軸方向の切れ目５の部分を拡開して鉄筋２に挿入し、
その後、筒状カバー４の復元力にて鉄筋２の外周表面に
軽く圧接するような内径であれば、筒状カバー４の装着
位置が軸方向にずれることが防止できるとともに、筒状
カバー４が鉄筋２周上で回転して前記切れ目５が上方に
向くこともない。また、前記筒状カバー４の長さについ
ては、少なくとも図８に示す筒状カバー４が無い場合に
比べ、筒状カバー４の装着長さだけ鉄筋を大きく伸ばす
ことによりコンクリート目地部のひび割れの集中率を上
げることができるものであればよい。なお、７はひび割
れ誘発目地部に防水のために設けられるシーリング材等
を示す。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention. FIG. 1 schematically shows a state in which a reinforcing bar 2 is provided with a crack-inducing joint 3 on the surface of concrete 1, and FIG. This shows a mounted state. 1 (A) and 1 (B) are cross sections of a concrete wall.
A tubular cover 4 of an appropriate length having an axial cut 5 is attached to a portion of the reinforcing bar 2 crossing the crack-inducing joint 3. As the cylindrical cover 4, concrete 1
As a material having no adhesiveness, a resin material is suitable in terms of cost, but the resin material is not necessarily required as long as the relative movement between the tubular cover 4 and the reinforcing bar 2 is possible. In order to attach the cylindrical cover 4 to the reinforcing bar 2, the cylindrical cover 4
The part of the axial cut 5 is expanded and inserted into the reinforcing bar 2,
Thereafter, if the inner diameter is such that the cylindrical cover 4 is lightly pressed against the outer peripheral surface of the reinforcing bar 2 by the restoring force of the cylindrical cover 4, the mounting position of the cylindrical cover 4 can be prevented from shifting in the axial direction, and the cylindrical cover 4 can be prevented from being displaced. The cut 5 does not face upward due to rotation on the circumference of the reinforcing bar 2. In addition, as for the length of the cylindrical cover 4, the concentration of cracks at the concrete joints is increased by extending the rebar greatly by at least the mounting length of the cylindrical cover 4 as compared with the case without the cylindrical cover 4 shown in FIG. 8. What is necessary is just to be able to raise a rate. Reference numeral 7 denotes a sealing material or the like provided for waterproofing at the crack-inducing joint.
【００１２】以上の構成によって、図５に示したよう
に、筒状カバー４が装着された部分において、コンクリ
ート１の乾燥収縮時に筒状カバー４の外周面とコンクリ
ート１との間あるいは筒状カバー４内周面と鉄筋２の外
周面との間で軸方向の相対移動が発生することにより鉄
筋２とコンクリート１との付着が予め回避されるので、
この充分に長い区間（約２００ｍｍ〜３００ｍｍ）にお
いて鉄筋２を大きく伸びさせることができる。したがっ
て、ひび割れ誘発目地部３におけるひび割れ８の集中率
を充分に高めることができるので、ひび割れ誘発目地部
３以外の部分における有害なひび割れの発生を抑制する
ことができる。そして、筒状カバー４を単に鉄筋に装着
するのみの作業であることから、誤装着時のやり直しが
容易である。また、筒状カバー４の着色等により、所要
部位への配分や点検、検査等の品質管理がしやすく、床
や壁等の構造物としての品質の向上に大きく寄与でき
る。With the above configuration, as shown in FIG. 5, in the portion where the cylindrical cover 4 is mounted, the space between the outer peripheral surface of the cylindrical cover 4 and the concrete 1 or the cylindrical cover when the concrete 1 dries and shrinks. 4. Since the axial relative movement occurs between the inner peripheral surface of the reinforcing bar 2 and the outer peripheral surface of the reinforcing bar 2, the adhesion between the reinforcing bar 2 and the concrete 1 is avoided in advance.
In this sufficiently long section (about 200 mm to 300 mm), the reinforcing bar 2 can be greatly extended. Therefore, the concentration ratio of the cracks 8 at the crack-inducing joints 3 can be sufficiently increased, so that the occurrence of harmful cracks in portions other than the crack-inducing joints 3 can be suppressed. And since it is the work which only attaches the cylindrical cover 4 to a rebar, it is easy to redo at the time of incorrect attachment. In addition, the coloring of the cylindrical cover 4 and the like facilitates quality control such as distribution to a required portion, inspection, inspection, and the like, and greatly contributes to improvement in quality as a structure such as a floor or a wall.
【００１３】本第１実施例では、筒状カバー４の形状は
軸方向の切れ目５を有する適宜の長さの筒状物として形
成されるが、鉄筋２への装着後に図２（Ａ）のように軸
方向の切れ目５の両縁が重複した寸法に選択してもよ
い。図２（Ｂ）は鉄筋２に鍔２Ａが間隔を置いて多数設
けられたものに筒状カバー４が装着されたものである。
図２（Ｃ）は図２（Ｂ）のＣ−Ｃ断面である。また、筒
状カバー４は図２（Ｄ）のように切れ目５が大きい幅の
寸法に選択してもよい。なお、図２（Ｅ）は外周を金属
で覆った金属カバー６であり、金属層６Ａとこれを被覆
する樹脂被覆層６Ｂとによって構成された例である。In the first embodiment, the shape of the cylindrical cover 4 is formed as a cylindrical object having an appropriate length and having a cut 5 in the axial direction. As described above, both edges of the axial cut 5 may be selected to have an overlapping size. FIG. 2B shows a configuration in which a tubular cover 4 is attached to a reinforcing bar in which a large number of flanges 2A are provided at intervals.
FIG. 2C is a cross-sectional view taken along line CC of FIG. Alternatively, the cylindrical cover 4 may be selected to have a width having a large gap 5 as shown in FIG. FIG. 2E shows a metal cover 6 whose outer periphery is covered with a metal, which is an example composed of a metal layer 6A and a resin coating layer 6B covering the metal layer 6A.
【００１４】次に、図３によって本発明の第２実施例を
示す。本実施例は、前記第１実施例のものと基本的な構
造は同様であるが、前記第１実施例の鉄筋２への装着後
に軸方向の切れ目５の両縁が重複した寸法に選択された
ものにおいて、これら切れ目５の両縁が互いに係合する
係合突縁４Ａ、４Ｂに形成されているものである。これ
によって、筒状カバー４の鉄筋２における装着後の妄動
を確実に防止し、ひび割れ誘発目地部３に対する筒状カ
バー４の位置の保持を確実にし、ひび割れの集中率の精
度を確保できる。また、筒状カバー４が鉄筋２周上で回
転することもない。Next, FIG. 3 shows a second embodiment of the present invention. This embodiment has the same basic structure as that of the first embodiment, except that both edges of the cut 5 in the axial direction after the attachment to the reinforcing bar 2 of the first embodiment are selected to have overlapping dimensions. In this case, both edges of these cuts 5 are formed on engaging projections 4A and 4B which engage with each other. As a result, after the tubular cover 4 is attached to the rebar 2 after being attached to the reinforcing bar 2, delusion is reliably prevented, the position of the tubular cover 4 with respect to the crack-inducing joint 3 is reliably maintained, and the accuracy of the concentration rate of cracks can be secured. Further, the cylindrical cover 4 does not rotate on the circumference of the reinforcing bar 2.
【００１５】次に、図４によって本発明の第３実施例を
示す。本実施例は、前記第１実施例の鉄筋２への装着後
に軸方向の切れ目５の両縁が重複しない寸法に選択され
たものにおいて、これら切れ目５の両縁に互いに係合す
る係合凹部４Ｃと係合舌片４Ｄとを設けたものである。
これによって、前記第３実施例と同様に、筒状カバー４
の鉄筋２における装着後の妄動を確実に防止し、ひび割
れ誘発目地部３に対する筒状カバー４の位置の保持を確
実にしてひび割れの集中率の精度を確保できる。また、
筒状カバー４が鉄筋２周上で回転することもない。Next, FIG. 4 shows a third embodiment of the present invention. In this embodiment, the engagement recesses which engage with both edges of these cuts 5 in a case where both edges of the cuts 5 in the axial direction are selected so as not to overlap each other after being attached to the reinforcing bar 2 of the first embodiment. 4C and an engagement tongue 4D.
Thereby, similarly to the third embodiment, the cylindrical cover 4
Of the rebar 2 after being attached is reliably prevented, and the position of the tubular cover 4 with respect to the crack-inducing joint 3 is reliably maintained, so that the accuracy of the concentration rate of cracks can be secured. Also,
The cylindrical cover 4 does not rotate on the circumference of the reinforcing bar 2.
【００１６】以上各実施例について説明してきたが、本
発明の趣旨の範囲内で、ひび割れ誘発目地部の形状、本
数、寸法および構造物上の位置、鉄筋の形状、本数、寸
法および鉄骨との組合せ形状、筒状カバーの形状、寸
法、材質等については適宜選択できることは言うまでも
ないことである。Although the embodiments have been described above, the shape, the number, the size and the position on the structure of the crack-inducing joint, the shape, the number and the size of the reinforcing bar, and the relationship with the steel frame are within the scope of the present invention. It goes without saying that the combination shape, the shape, dimensions, material, and the like of the cylindrical cover can be appropriately selected.
【００１７】[0017]
【発明の効果】以上詳細に説明してきたように、本発明
では、コンクリート表面の目地部を横断する鉄筋に、適
宜の長さの筒状カバーを装着して、この部分における鉄
筋とコンクリートとの付着を回避させ、前記目地部のひ
び割れを促進するように構成したので、前記筒状カバー
の存在によって、この区間において予め鉄筋とコンクリ
ートとの付着が回避されているので、筒状カバー部分に
おいて鉄筋を伸びさせることができる。したがって、ひ
び割れ誘発目地部におけるひび割れ集中率を充分に高め
ることができるので、ひび割れ誘発目地部以外の部分に
おける有害なひび割れの発生を抑制することができる。
しかも、本発明では、鉄筋とコンクリートとの付着の回
避区間の確保のために鉄筋を切断することもなく、単に
鉄筋に軸方向の切れ目を有する適宜の長さの筒状カバー
を装着するのみの簡単な作業で済み、従来のもののよう
なテープの巻付けや塗装作業と異なり、建築現場での施
工性がきわめて高いものでありながら、コンクリート構
造物としての強度も充分に確保でき、構造耐力が向上す
るものである。そして、筒状カバーを単に鉄筋に装着す
るのみの作業であることから、誤装着時のやり直しが容
易である。また、筒状カバーの着色判別等により、所要
部位への配分や点検、検査等の品質管理がしやすく、床
や壁等の構造物としての品質の向上に大きく寄与できる
コンクリートの乾燥収縮ひび割れ誘発目地部の処理方法
が提供できる。As described above in detail, according to the present invention, a tubular cover of an appropriate length is attached to a reinforcing bar crossing a joint on a concrete surface, and the reinforcing bar and the concrete at this portion are attached to each other. Adhesion is avoided and cracks in the joints are promoted, so that the presence of the cylindrical cover prevents adhesion of reinforcing steel and concrete in advance in this section. Can be extended. Therefore, the concentration rate of cracks at the joints where the cracks are induced can be sufficiently increased, and the occurrence of harmful cracks at portions other than the joints where the cracks are induced can be suppressed.
Moreover, in the present invention, the reinforcing bar is not cut in order to secure a section where the reinforcing bar and the concrete do not adhere to each other, but is simply attached to the reinforcing bar with a cylindrical cover of an appropriate length having an axial cut. Simple work is required, and unlike the conventional tape winding and painting work, the workability at the construction site is extremely high, yet the strength as a concrete structure can be sufficiently secured and the structural strength It will improve. And since it is the operation | work which only attaches a cylindrical cover to a reinforcing bar, it is easy to redo at the time of incorrect mounting. In addition, by determining the coloring of the cylindrical cover, etc., it is easy to control the quality of distribution, inspection, inspection, etc. to required parts, and joints that induce dry shrinkage cracks in concrete that can greatly contribute to improving the quality of structures such as floors and walls. The processing method of the section can be provided.
【図１】本発明の第１実施例を示し、鉄筋がコンクリー
ト表面にひび割れ誘発目地部を設けた状態の概略を示
す。FIG. 1 shows a first embodiment of the present invention, and schematically shows a state in which a reinforcing bar is provided with a crack-inducing joint on a concrete surface.
【図２】本発明の第１実施例を示し、筒状カバーが鉄筋
に装着された状態を示す。FIG. 2 shows the first embodiment of the present invention, and shows a state in which a tubular cover is attached to a reinforcing bar.
【図３】本発明の第２実施例を示す。FIG. 3 shows a second embodiment of the present invention.
【図４】本発明の第３実施例を示す。FIG. 4 shows a third embodiment of the present invention.
【図５】本発明のひび割れ誘発目地部における鉄筋応力
の状態を示す。FIG. 5 shows the state of reinforcing bar stress at a crack-induced joint according to the present invention.
【図６】コンクリート床構造物に縦横にひび割れ誘発目
地部が設けられた状態を示す。FIG. 6 shows a state in which crack-inducing joints are provided vertically and horizontally on a concrete floor structure.
【図７】コンクリート壁構造物に縦横にひび割れ誘発目
地部が設けられた状態を示す。FIG. 7 shows a state in which crack-inducing joints are provided vertically and horizontally on a concrete wall structure.
【図８】鉄筋がコンクリート表面にひび割れ誘発目地部
を設けた状態の従来例の概略を示す。FIG. 8 schematically shows a conventional example in which a reinforcing bar is provided with a crack-inducing joint on a concrete surface.
１ コンクリート ２ 鉄筋 ２Ａ 鍔 ３ ひび割れ誘発目地部 ４ 筒状カバー ４Ａ 係合突縁 ４Ｂ 係合突縁 ４Ｃ 係合凹部 ４Ｄ 係合舌片 ５ 切れ目 ６ 金属カバー ６Ａ 金属層 ６Ｂ 樹脂被覆層 ７ シーリング材 ８ ひび割れ ９ 大梁 １０ 小梁 １２ 柱 DESCRIPTION OF SYMBOLS 1 Concrete 2 Reinforcing bar 2A flange 3 Crack induction joint part 4 Cylindrical cover 4A Engagement ridge 4B Engagement ridge 4C Engagement recess 4D Engagement tongue piece 5 Cut 6 Metal cover 6A Metal layer 6B Resin coating layer 7 Sealing material 8 Crack 9 Large beam 10 Small beam 12 pillar
───────────────────────────────────────────────────── フロントページの続き (72)発明者 内山 政彦 東京都中央区銀座６丁目２番10号 株式 会社巴コーポレーション内 (72)発明者 神谷 清太郎 東京都中央区銀座６丁目２番10号 株式 会社巴コーポレーション内 (56)参考文献 特開 平５−311767（ＪＰ，Ａ) 特開 昭63−85139（ＪＰ，Ａ) 特公 平４−7783（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) E04B 1/62 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Masahiko Uchiyama 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation (72) Inventor Seitaro Kamiya 6-2-10 Ginza, Chuo-ku, Tokyo Co., Ltd. Tomoe Corporation (56) References JP-A-5-311767 (JP, A) JP-A-63-85139 (JP, A) JP-B-4-7783 (JP, B2) (58) Fields surveyed (Int. Cl. 6 , DB name) E04B 1/62
Claims (1)
ンクリート構造物における、コンクリートの乾燥収縮ひ
び割れ対策のため、コンクリート表面にひび割れ誘発目
地部が設けられたコンクリート目地部の処理方法におい
て、前記コンクリート表面の目地部を横断する鉄筋に、
適宜の長さの筒状カバーを装着して、この部分における
鉄筋とコンクリートとの付着を回避させ、前記目地部の
ひび割れを促進するように構成したことを特徴とするコ
ンクリートの乾燥収縮ひび割れ誘発目地部の処理方法。1. A method for treating a concrete joint having a crack-inducing joint on a concrete surface thereof in a concrete structure, such as a floor or a wall, in which a reinforcing bar is embedded, in order to prevent drying shrinkage of the concrete. For reinforcing bars that cross the joints on the concrete surface,
Wearing the appropriate length of the cylindrical cover, to avoid adhesion between the reinforcing bars and the concrete in this section, Cracking induced joint concrete, characterized by being configured to facilitate cracking of the joints How to handle the part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23875394A JP2948737B2 (en) | 1994-10-03 | 1994-10-03 | Drying shrinkage crack-inducing joint treatment method for concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23875394A JP2948737B2 (en) | 1994-10-03 | 1994-10-03 | Drying shrinkage crack-inducing joint treatment method for concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08100475A JPH08100475A (en) | 1996-04-16 |
| JP2948737B2 true JP2948737B2 (en) | 1999-09-13 |
Family
ID=17034756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23875394A Expired - Lifetime JP2948737B2 (en) | 1994-10-03 | 1994-10-03 | Drying shrinkage crack-inducing joint treatment method for concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2948737B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015014148A (en) * | 2013-07-05 | 2015-01-22 | 株式会社竹中工務店 | Joint structure and tiling method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4633230B2 (en) * | 2000-06-21 | 2011-02-16 | 大和ハウス工業株式会社 | Ant-proof structure between concrete soils |
| CN111605908A (en) * | 2020-04-17 | 2020-09-01 | 华北水利水电大学 | Large-diameter silo with controlled fracture conduction and method for controlling cracks in large-diameter silo |
| CN114293432B (en) * | 2021-12-29 | 2023-06-27 | 中冶南方城市建设工程技术有限公司 | Method for actively inducing continuous reinforced concrete pavement cracks |
-
1994
- 1994-10-03 JP JP23875394A patent/JP2948737B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015014148A (en) * | 2013-07-05 | 2015-01-22 | 株式会社竹中工務店 | Joint structure and tiling method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08100475A (en) | 1996-04-16 |
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