JP2019049125A - Coupler for steel bar joint - Google Patents
Coupler for steel bar joint Download PDFInfo
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- JP2019049125A JP2019049125A JP2017173360A JP2017173360A JP2019049125A JP 2019049125 A JP2019049125 A JP 2019049125A JP 2017173360 A JP2017173360 A JP 2017173360A JP 2017173360 A JP2017173360 A JP 2017173360A JP 2019049125 A JP2019049125 A JP 2019049125A
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- coupler
- joint
- rebar
- reinforcing bar
- adhesive
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- 229910000831 Steel Inorganic materials 0.000 title abstract description 27
- 239000010959 steel Substances 0.000 title abstract description 27
- 230000002093 peripheral effect Effects 0.000 claims abstract description 40
- 239000000853 adhesive Substances 0.000 claims abstract description 39
- 230000001070 adhesive effect Effects 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000011440 grout Substances 0.000 claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims description 58
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 21
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 239000008187 granular material Substances 0.000 abstract description 23
- 239000004570 mortar (masonry) Substances 0.000 description 17
- 239000002245 particle Substances 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 11
- 239000004567 concrete Substances 0.000 description 9
- 239000011150 reinforced concrete Substances 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000005304 joining Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
本発明は、鉄筋どうしをモルタル充填型機械式継手にて接合する際に用いる鉄筋継手用カプラーに関する。 The present invention relates to a coupler for a reinforcing bar joint used when joining reinforcing bars with a mortar-filled mechanical joint.
カプラーを用いて鉄筋同士を接合する機械式継手のなかでも、モルタル充填型機械式継手は、鉄筋どうしの軸芯に施工誤差による位置ズレが生じていても、現場にてこれを容易に吸収できる継手として、一般に広く用いられている。このようなモルタル充填型機械式継手に採用されるカプラーには、その中空部に充填されるモルタルに対するカプラーの付着性能を高めるための凹凸が、中空部を形成する内周面に設けられている。 Among mechanical joints in which reinforcing bars are joined together using couplers, mortar-filled mechanical joints can easily absorb them at the site even if positional deviations due to construction errors occur in the shaft centers of the reinforcing bars Generally used as a joint. The couplers employed in such mortar-filled mechanical joints are provided on the inner circumferential surface forming the hollow portion with projections and depressions for enhancing the adhesion performance of the coupler to the mortar filled in the hollow portion. .
例えば、特許文献１には、セメント質充填物が充填される接合鋼管を用いて異形鉄筋を接合するにあたり、通常の鋼管をロールによりプレスして内外面に凹凸を備えた接合鋼管を製造する方法が開示されている。また、特許文献２には、ダクタイル鋳鉄から鋳造され、内部に複数の内周突起を備えた円筒状のスリーブ本体よりなる、モルタル充填式鉄筋継手スリーブが開示されている。 For example, Patent Document 1 discloses a method of manufacturing a welded steel pipe having irregularities on the inner and outer surfaces by pressing an ordinary steel pipe with a roll in bonding a deformed steel bar using a welded steel pipe filled with a cementitious filler. Is disclosed. Further, Patent Document 2 discloses a mortar-filled rebar joint sleeve made of ductile cast iron and formed of a cylindrical sleeve main body provided with a plurality of inner peripheral protrusions inside.
特許文献１のように、通常の鋼管を外周面から押し込んで塑性変形させることにより内周面に凹凸形状を設けて付着性能を高めた接合鋼管を製造する場合、その凹凸形状は緩やかでかつ大きな起伏形状に成形される。このため、接合鋼管に用いる凹凸形状を設ける前の鋼管には、起伏の大きさを考慮して断面径の大きいものを採用せざるを得ず、材料コストが増大するとともに、施工性に劣る。また、凹凸形状の起伏が緩やかであることに伴い、中空部に充填されるモルタルに対して接合鋼管の付着性能が劣る場合が多い。 As in Patent Document 1, when manufacturing a welded steel pipe with an adhesion performance improved by pressing an ordinary steel pipe from the outer peripheral surface and plastically deforming it to produce an adhesion performance, the unevenness is gentle and large. It is shaped into a relief shape. For this reason, it is necessary to adopt a steel pipe having a large cross-sectional diameter in consideration of the size of undulations as the steel pipe before forming the concavo-convex shape used for the jointed steel pipe, and the material cost increases and the workability is inferior. In addition, the adhesion performance of the joined steel pipe is often inferior to the mortar filled in the hollow portion due to the gentle undulation of the uneven shape.
一方、特許文献２のように、鋳造にて内周突起を備えたスリーブを製造する場合、これら内周突起に対応する凹部を表面に設けた中子を用意する必要があり、製造コストが増大しやすい。また、鋳造品は最小部材厚に制限があることから、細径鉄筋を接合するためのスリーブであっても、太径鉄筋を接合するためのスリーブと同程度の鋼材量を必要とするため、接合しようとする鉄筋径によっては不経済となりやすい。 On the other hand, as in Patent Document 2, when manufacturing a sleeve provided with inner circumferential projections by casting, it is necessary to prepare a core provided with recesses corresponding to these inner circumferential projections, which increases the manufacturing cost It's easy to do. In addition, since the cast product is limited to the minimum member thickness, even a sleeve for joining small diameter rebars requires the same amount of steel as a sleeve for joining large diameter rebars, It is likely to be uneconomical depending on the diameter of the reinforcing bar to be joined.
本発明は、かかる課題に鑑みなされたものであって、その主な目的は、経済的かつ簡略な構成で、接合しようとする鉄筋に適した大きさの鉄筋継手用カプラーを提供することである。 The present invention has been made in view of such problems, and its main object is to provide a coupler for a bar joint having a size suitable for reinforcing bars to be joined with an economical and simple configuration. .
かかる目的を達成するため、本発明の鉄筋継手用カプラーは、筒状体よりなり、中空部に、鉄筋が端部開口より挿入されるとともに、グラウト材が充填される鉄筋継手用カプラーであって、前記中空部を形成する内周面に、該内周面を被覆する接着剤と、該接着剤にて保持された粒状体よりなる粗面を備えることを特徴とする。 In order to achieve the above object, the coupler for a rebar joint according to the present invention is a coupler for a rebar joint, which is formed of a cylindrical body and in which a rebar is inserted from an end opening into a hollow portion and filled with grout material. An inner peripheral surface forming the hollow portion is provided with an adhesive for covering the inner peripheral surface, and a rough surface including a granular material held by the adhesive.
上述する本発明の鉄筋継手用カプラーによれば、内周面に備えた粗面を介して、中空部に充填されたグラウト材を鉄筋継手用カプラーに対して強固に付着させることができる。これにより、グラウト材に対する付着性能を高めるべく、鋼管に塑性変形を生じさせるような加工を施したり鋳造で製作するなどして、内周面に形成していた凹凸形状やリブを省略できる。したがって、鉄筋継手用カプラーに、中空軸方向に一様な筒状体を採用することができるとともに、大幅な小径化を図ることが可能となる。 According to the rebar joint coupler of the present invention described above, the grout material filled in the hollow portion can be firmly attached to the rebar joint coupler via the rough surface provided on the inner circumferential surface. As a result, in order to enhance the adhesion performance to the grout material, it is possible to omit the concavo-convex shape and the ribs formed on the inner peripheral surface by processing such as causing plastic deformation to the steel pipe or manufacturing by casting. Therefore, while being able to employ | adopt a cylindrical body uniform to a hollow axial direction as a coupler for rebar couplings, it becomes possible to achieve significant diameter reduction.
このように小径化された鉄筋継手用カプラーを用いて鉄筋を接合し、これを鉄筋コンクリート造の躯体に採用すると、鉄筋からコンクリート表面に至るコンクリートのかぶり厚を小さくできる。これにより、鉄筋コンクリート造の躯体に対して、経済的な断面設計を行うことができ、施工費や材料費を大幅に削減することが可能となる。 When the reinforcing bar joint couplers thus reduced in diameter are used to join the reinforcing bars and this is adopted for a reinforced concrete structure, the cover thickness of concrete from the reinforcing bars to the surface of the concrete can be reduced. As a result, it is possible to carry out an economical cross-sectional design on a reinforced concrete structure, and it is possible to significantly reduce construction costs and material costs.
さらに、内周面に形成していた凹凸形状やリブを省略し、中空軸方向に一様な筒状体を採用できることから、一般市場に流通している鋼管を適用することも可能となる。したがって、接合しようとする鉄筋の節径に応じて、必要最小限の中空部断面径を有する鋼管を適宜選択し、これを鉄筋継手用カプラーに採用すればよく、無駄な材料費を投じることなくコストを大幅に低減することが可能となるだけでなく、鉄筋継手用カプラーの少量調達も可能となる。 Furthermore, since the uneven shape and ribs formed on the inner peripheral surface can be omitted and a uniform cylindrical body can be adopted in the direction of the hollow axis, it is also possible to apply a steel pipe circulating in the general market. Therefore, according to the node diameter of the reinforcing bar to be joined, a steel pipe having a necessary minimum cross-sectional diameter of the hollow portion may be appropriately selected, and this may be adopted as a coupler for reinforcing bar joint without throwing waste material cost. Not only can it be possible to significantly reduce costs, but it also becomes possible to procure small quantities of couplers for rebar joints.
また、本発明の鉄筋継手用カプラーは、前記粒状体が、珪砂であることを特徴とする。 The rebar joint coupler of the present invention is characterized in that the granular material is silica sand.
上述する本発明の鉄筋継手用カプラーによれば、前記粒状体に珪砂を用いることから、安価で安定的に入手しやすいとともに、適した粒度分布の珪砂を選択することにより、接着剤に粒状体を吹き付けて粗面を形成する際に、接着剤の内側に入り込む部分と外側に突出する部分とをバランスよく分布させて、粗面の表面に適切な高さの微細突起を設けることが可能となる。 According to the above-described coupler for rebar joint of the present invention, since silica sand is used for the granular body, the granular body can be obtained by selecting the silica sand having a suitable particle size distribution, as well as being inexpensive and stably available. When forming a rough surface by spraying the inside of the adhesive and the portion projecting outward in a balanced manner, it is possible to provide fine projections of an appropriate height on the surface of the rough surface. Become.
本発明の鉄筋継手用カプラーは、前記中空部の断面径が、中空軸方向に異なることを特徴とする。 The coupler for rebar joint according to the present invention is characterized in that the cross-sectional diameter of the hollow portion is different in the hollow axial direction.
上述する本発明の鉄筋継手用カプラーによれば、内周面に粗面を備えるとともに、中空部の断面径を中空軸方向に異ならせるような凹凸形状やリブ等を内周面に備えることにより、両者が相まって中空部に充填されたグラウト材に対する付着性能をより向上させることが可能となる。また、中空部の断面径を中空軸方向に異ならせるような凹凸形状やリブは、その起伏量を小さくできるため、鉄筋を端部開口から中空部へ挿入しやすくでき、施工性を大幅に向上することも可能となる。 According to the above-described coupler for rebar joint of the present invention, the inner circumferential surface is provided with a rough surface, and the inner circumferential surface is provided with a concavo-convex shape, a rib and the like that make the cross-sectional diameter of the hollow portion different in the hollow axis direction. It is possible to further improve the adhesion performance to the grout material filled in the hollow portion by combining the two. In addition, the uneven shape or rib that makes the cross-sectional diameter of the hollow part different in the hollow axis direction can reduce the amount of unevenness, so it is easy to insert the reinforcing bar from the end opening into the hollow part, greatly improving the workability. It will also be possible.
本発明の鉄筋継手用カプラーは、外周面に、前記粗面を備えることを特徴とする。 The coupler for rebar joint according to the present invention is characterized in that the rough surface is provided on the outer peripheral surface.
上述する本発明の鉄筋継手用カプラーによれば、外周面に粗面を備える鉄筋継手用カプラーにて接合した鉄筋を、鉄筋コンクリート造の躯体に採用することにより、鉄筋と同程度のコンクリートに対する付着性能を、鉄筋継手用カプラーにも確保することが可能となる。 According to the above-described coupler for rebar joint of the present invention, the adhesion performance to the same degree of adhesion to concrete as that of rebar can be achieved by adopting the rebar joined by the rebar joint coupler having a rough surface on the outer peripheral surface as a reinforced concrete frame. Can also be secured to the rebar joint coupler.
本発明の鉄筋継手用カプラーは、前記接着剤が、ポリビニルブチラールを主成分とするポリビニルブチラール樹脂であることを特徴とする。 The coupler for rebar joint according to the present invention is characterized in that the adhesive is a polyvinyl butyral resin containing polyvinyl butyral as a main component.
上述する本発明の鉄筋継手用カプラーによれば、ポリビニルブチラール樹脂が所定の膜厚を確保することで防錆被膜として機能することから、鉄筋継手用カプラーに高い耐食性能を付与することができる。したがって、例えば臨海部等の塩化物に晒される環境に建設されるコンクリート構造物の鉄筋継手として、使用することが可能となる。 According to the rebar joint coupler of the present invention described above, the polyvinyl butyral resin functions as a rust-preventing film by securing a predetermined film thickness, and therefore, the rebar joint coupler can be provided with high corrosion resistance. Therefore, it becomes possible to use, for example, as a rebar joint of a concrete structure constructed in an environment exposed to a chloride such as a seaside area.
本発明によれば、鉄筋継手用カプラーの内周面に接着剤にて保持された粒状体よりなる粗面を備えるのみの簡略な構成にて、中空部に充填されたグラウト材に対する付着性能を向上できる。これにより、鉄筋継手用カプラーは、その内周面に形成していた凹凸形状やリブを省略して、接合しようとする鉄筋の節径に応じた中空部断面径を備える最小限の形状とすることが可能となる。 According to the present invention, the adhesion performance to the grout material filled in the hollow portion can be achieved with a simple configuration having only a rough surface composed of particles held by the adhesive on the inner circumferential surface of the bar joint coupler. It can improve. As a result, the coupler for reinforcing bar joint omits the concavo-convex shape and ribs formed on the inner circumferential surface thereof, and has a minimum shape having a hollow section cross-sectional diameter corresponding to the node diameter of the reinforcing bar to be joined. It becomes possible.
本発明における鉄筋継手用カプラーは、モルタル充填型機械式継手にて、鉄筋を接合する際に用いるものであり、中空部を形成する内周面に粒状体を利用した粗面を設けることで、中空部に充填されるグラウト材に対する鉄筋継手用カプラーの付着性能を確保するものである。以下に、本実施の形態における鉄筋継手用カプラーを、図１〜図７を参照しつつ説明する。 The coupler for rebar joint according to the present invention is a mortar-filled mechanical joint that is used when joining reinforcing bars, and is provided with a rough surface using a granular material on the inner circumferential surface forming the hollow portion, It secures the adhesion performance of the coupler for rebar joint to the grout material filled in the hollow part. Hereinafter, the rebar joint coupler according to the present embodiment will be described with reference to FIGS. 1 to 7.
鉄筋継手用カプラー１は、図１で示すように、両端が開口し、中空部の断面径が中空軸方向に変化のない一様な鋳造品や鋼管等の筒状体であり、本実施の形態では、一般市場に流通している鋼管を採用している。そして、鉄筋継手用カプラー１の中空部を形成する内周面には、粗面２が設けられている。 As shown in FIG. 1, the rebar joint coupler 1 is a cylindrical member such as a uniform cast product or a steel pipe whose both ends are open and the cross-sectional diameter of the hollow portion does not change in the hollow axial direction. In the form, the steel pipe distributed to the general market is adopted. And the rough surface 2 is provided in the inner peripheral surface which forms the hollow part of the coupler 1 for reinforcement joints.
粗面２は、図２（ａ）（ｂ）で示すように、鉄筋継手用カプラー１の内周面を被覆する接着剤３と、この接着剤３にて保持された粒状体４とにより形成される。 The rough surface 2 is, as shown in FIGS. 2A and 2B, formed of an adhesive 3 for covering the inner peripheral surface of the reinforcing bar coupler 1 and a granular material 4 held by the adhesive 3. Be done.
接着剤３は、鉄筋継手用カプラー１の内周面になじみよく接着し、かつ粒状体４を保持することの可能な材料であれば、例えばエポキシ樹脂等、いずれを採用してもよいが、本実施の形態では、ポリビニルブチラール樹脂を採用している。ポリビニルブチラール樹脂は、金属やガラス等様々な基材に対して高い接着性を有するポリビニルブチラールを主成分とする接着剤であり、金属の表面を被膜する際に、所定量の膜厚を確保することにより、防錆剤としても機能する材料である。 The adhesive 3 may be any material, for example epoxy resin, as long as it is a material capable of adhering to the inner circumferential surface of the reinforcing bar joint coupler 1 and retaining the granular material 4. In the present embodiment, polyvinyl butyral resin is employed. The polyvinyl butyral resin is an adhesive mainly composed of polyvinyl butyral having high adhesiveness to various substrates such as metal and glass, and when coating the surface of a metal, a predetermined amount of film thickness is secured Is a material that also functions as a rust inhibitor.
一方、粒状体４は、例えばガラスビーズや製鋼スラグ等、粒径が０．３ｍｍ未満で硬質な粒状材であれば、いずれを採用することも可能であるが、本実施の形態では、ＳｉＯ2を主成分とする粒状の鉱物である珪砂を採用している。 On the other hand, any granular material 4 such as glass beads or steelmaking slag may be used as long as it is a hard granular material having a particle diameter of less than 0.3 mm, but in the present embodiment SiO 2 It uses silica sand, which is a granular mineral whose main component is
これら接着剤３と粒状体４とは、いずれの態様にて粗面２を形成するものであってもよいが、本実施の形態では、２種類の態様の粗面２をその製造方法と併せて、以下に例示する。 The adhesive 3 and the particles 4 may form the rough surface 2 in any manner, but in the present embodiment, the rough surface 2 of the two types of aspects is combined with its manufacturing method. Are illustrated below.
＜第１の実施の形態＞
図２（ａ）で示す粗面２は、鉄筋継手用カプラー１の内周面を被覆する接着剤３の表面に、粒状体４を固着してなるものである。その製造方法は、図３（ａ）で示すように、鉄筋継手用カプラー１を、容器２２に貯留させた接着剤３に漬け込み、少なくとも内周面を接着剤３にて被覆する。
First Embodiment
The rough surface 2 shown in FIG. 2 (a) is obtained by fixing the granular material 4 on the surface of the adhesive 3 which covers the inner peripheral surface of the coupler 1 for reinforcing bar joint. In the manufacturing method, as shown in FIG. 3A, the rebar joint coupler 1 is dipped in the adhesive 3 stored in the container 22, and at least the inner peripheral surface is covered with the adhesive 3.
その後、図３（ｂ）で示すように、接着剤３に粒状体４を固着できる程度の噴射圧力をもって、吹付ノズル２１にて粒状体４を噴射させて、接着剤３の表面に粒状体４を吹付ける。この状態で、接着剤３を硬化させることにより、粒状体４を固着させて粗面２を形成する。 Thereafter, as shown in FIG. 3 (b), the particles 4 are jetted by the spray nozzle 21 with a jet pressure sufficient to fix the particles 4 to the adhesive 3, and the particles 4 are formed on the surface of the adhesive 3. Blow In this state, the adhesive 3 is cured to fix the particles 4 and form the rough surface 2.
ここで、発明者らは鋭意検討の結果、粒状体４を接着剤３に対して吹付ノズル２１にて吹付ける方法にて粗面２を形成する場合には、粒状体４として８号珪砂を採用することが好適であるとの知見を得ている。 Here, as a result of intensive investigations, in the case where the rough surface 2 is formed by a method of spraying the granular material 4 against the adhesive 3 with the spray nozzle 21, No. 8 silica sand is used as the granular material 4. We have found that it is preferable to adopt.
これは、８号珪砂が、粒径０．１５ｍｍ未満であって粒径０．０５ｍｍ以上の粒子が７０％以上占める粒度分布を有するため、接着剤３に対して吹き付けた際に、接着剤３の内側に入り込む部分と接着剤３の外側に突出する部分とを、バランスよく形成することができる。これにより、適切な高さの微細突起を表面に備えた粗面２を形成できるとともに、摩擦が作用した際の粒状体４の離脱を最小限に抑えることができるものである。 This is because No. 8 silica sand has a particle size distribution in which particles having a particle diameter of less than 0.15 mm and particles having a particle diameter of 0.05 mm or more occupy 70% or more. The part which enters inside and the part which protrudes to the outside of adhesive 3 can be formed in a well-balanced manner. This makes it possible to form the rough surface 2 provided with fine projections of an appropriate height on the surface, and to minimize the detachment of the granular material 4 when the friction acts.
なお、接着剤３の表面に粒状体４を固着させてなる粗面２の製造方法は、必ずしも上記の方法に限定されるものではない。例えば、図３（ｃ）で示すように、鉄筋継手用カプラー１の内周面に接着剤３を、吹付ノズル２１を介して吹付けたりもしくは塗布した後、接着剤３の表面に粒状体４を散布するとともに押圧力を作用させて、粒状体４を接着剤３に固着させてもよい。 In addition, the manufacturing method of the rough surface 2 which makes the granular material 4 adhere on the surface of the adhesive 3 is not necessarily limited to said method. For example, as shown in FIG. 3C, after the adhesive 3 is sprayed or applied to the inner peripheral surface of the reinforcing bar coupler 1 through the spray nozzle 21, the particles 4 are formed on the surface of the adhesive 3. The particulate material 4 may be fixed to the adhesive 3 by applying a pressure and applying a pressing force.
＜第２の実施の形態＞
図２（ｂ）で示す粗面２は、鉄筋継手用カプラー１の内周面に、粒状体４を混入させた接着剤３を被覆してなるものである。その製造方法もいずれでもよいが、例えば、図４（ａ）で示すように、接着剤３に粒状体４を混入して混合撹拌した混合物５を容器２２に貯留させておき、この容器２２内に鉄筋継手用カプラー１を漬け込んで、少なくとも内周面に混合物５を付着させる。
Second Embodiment
The rough surface 2 shown in FIG. 2B is obtained by coating the inner peripheral surface of the reinforcing bar coupler 1 with the adhesive 3 in which the granular material 4 is mixed. Although the manufacturing method may be any method, for example, as shown in FIG. 4A, the mixture 5 in which the granular material 4 is mixed with the adhesive 3 and mixed and stirred is stored in the container 22. Soak the coupler 1 for rebar joint in at least the inner peripheral surface so that the mixture 5 is attached.
この後、混合物５を硬化させて、鉄筋継手用カプラー１の内周面に粗面２を形成する。この場合、鉄筋継手用カプラー１の外周面に付着した混合物５は、付着させたまま放置してもよいし、洗浄してもよい。 After that, the mixture 5 is cured to form the rough surface 2 on the inner peripheral surface of the reinforcing bar coupler 1. In this case, the mixture 5 attached to the outer peripheral surface of the reinforcing bar joint coupler 1 may be left as it is attached or may be washed.
他の製造方法としては、例えば、図４（ｂ）で示すように、あらかじめ接着剤３に粒状体４を混合撹拌して製作した混合物５を、鉄筋継手用カプラー１の内周面に吹付ノズル２１を介して、混合物５が鉄筋継手用カプラー１の内周面に付着できる程度の噴射圧力をもって吹き付けた後、硬化させてもよい。 As another production method, for example, as shown in FIG. 4 (b), a mixture 5 prepared by mixing and stirring the granular material 4 in the adhesive 3 in advance is sprayed on the inner peripheral surface of the rebar joint coupler 1. After being sprayed with an injection pressure to such an extent that the mixture 5 can adhere to the inner peripheral surface of the reinforcing bar joint coupler 1 through 21, the mixture 5 may be cured.
上記のように製作された鉄筋継手用カプラー１には、図１で示すように、接合しようとする２本の鉄筋７それぞれの端部が、端部開口から中空部に挿入されるとともに、これら端部開口と鉄筋７との間の隙間がゴムキャップや間詰め材等の閉塞材（図示せず）により閉塞される。また、端部開口が閉塞された鉄筋継手用カプラー１の中空部には、鉄筋継手用カプラー１の側面に設けたグラウト充填孔１１からグラウト材６が注入される。この後、鉄筋継手用カプラー１の中空部を充填したグラウト材６が硬化すると、２本の鉄筋７が、鉄筋継手用カプラー１を用いたモルタル充填型機械式継手にて接合される。 In the coupler 1 for rebar joint manufactured as described above, as shown in FIG. 1, the ends of two rebars 7 to be joined are inserted into the hollow portion from the end opening, and A gap between the end opening and the reinforcing bar 7 is closed by a closing member (not shown) such as a rubber cap or padding. Further, the grout material 6 is injected from the grout filling hole 11 provided on the side surface of the reinforcing bar joint coupler 1 into the hollow portion of the bar joint coupler 1 whose end opening is closed. Thereafter, when the grout material 6 filled in the hollow portion of the rebar joint coupler 1 is hardened, the two rebars 7 are joined by the mortar-filled mechanical joint using the rebar joint coupler 1.
なお、鉄筋継手用カプラー１を用いたモルタル充填型機械式継手にて接合することの可能な鉄筋７は、外周面に例えば節状等の凹凸が形成された鉄筋であれば、異形鉄筋やねじ節鉄筋等、いずれの鉄筋でもよい。また、鉄筋継手用カプラー１の中空部に充填されるグラウト材６についても、一般にモルタル充填型機械式継手に採用されているセメント系硬化材であれば、無収縮モルタルや膨張モルタル等、いずれを採用することも可能である。 Rebar 7 that can be joined by a mortar-filled mechanical joint using coupler 1 for a rebar joint is, for example, deformed rebar or a screw if it is a rebar having unevenness such as nodal shape formed on the outer peripheral surface. It may be any rebar such as joint rebar. In addition, as for the grout material 6 to be filled in the hollow portion of the reinforcing bar coupler 1, any cement-based hardened material generally used for mortar-filled mechanical joints may be any of non-shrink mortar, expansion mortar, etc. It is also possible to adopt.
このような、粗面２が設けられた鉄筋継手用カプラー１を用いて、モルタル充填型機械式継手により接合された鉄筋７の一方に、例えば図５（ａ）で示すような、引張方向の外力が作用すると、その外力は、まず、鉄筋７の節部７１を介してグラウト材６に支圧力として伝達される。次に、グラウト材６から鉄筋継手用カプラー１に伝達されて、この後、グラウト材６を介して他方の鉄筋７に伝達される。 For example, as shown in FIG. 5A, in one of the reinforcing bars 7 joined by the mortar-filled mechanical joint using the coupler 1 for a reinforcing bar joint provided with the rough surface 2 as described above, for example, When an external force acts, the external force is first transmitted to the grout material 6 as a bearing pressure via the node portions 71 of the reinforcing bars 7. Next, it is transmitted from the grout material 6 to the rebar joint coupler 1 and then to the other rebar 7 via the grout material 6.
このとき、鉄筋継手用カプラー１には、その内周面に粗面２が形成されており、グラウト材６に対する付着性能が高められている。これにより、接続された鉄筋７の一方に作用された外力を、鉄筋継手用カプラー１を介してスムーズに他方の鉄筋７に伝達することが可能となる。 At this time, the rough surface 2 is formed on the inner peripheral surface of the reinforcing bar joint coupler 1, and the adhesion performance to the grout material 6 is enhanced. As a result, the external force applied to one of the connected rebars 7 can be smoothly transmitted to the other rebar 7 via the rebar joint coupler 1.
したがって、鉄筋継手用カプラー１に対して、従来のように、塑性変形を生じさせるような加工を施して鋼管に凹凸形状を設けたり、鋳造で製作して内周面にリブを設ける必要がない。このため、鉄筋継手用カプラー１は、図５（ａ）で示すように、中空部断面径Ｌ１として少なくとも必要最小限の径長、つまり、鉄筋７の節部７１の径Ｌ２に製造誤差を加算した数量と粗面２の層厚Ｌ３とを足し合わせた長さを確保すればよい。 Therefore, it is not necessary to process the steel bar coupler 1 so as to cause plastic deformation as in the prior art to provide an uneven shape to the steel pipe or to form a rib on the inner circumferential surface by casting. . Therefore, as shown in FIG. 5 (a), the reinforcing bar joint coupler 1 adds a manufacturing error to at least the minimum necessary diameter as the hollow section cross-sectional diameter L1, that is, the diameter L2 of the node 71 of the reinforcing bar 7. The length obtained by adding the above-mentioned number and the layer thickness L3 of the rough surface 2 may be secured.
また、一般に鉄筋７の節部７１を介してグラウト材６に支圧力が伝達されると、グラウト材６は、鉄筋継手用カプラー１に向かう横膨張変形を生じるが、このとき、鉄筋継手用カプラー１による拘束効果が機能し、グラウト材６に対する付着強度が向上することが知られている。 Also, generally, when the bearing pressure is transmitted to the grout material 6 through the node portions 71 of the rebar 7, the grout material 6 causes a lateral expansion deformation toward the rebar joint coupler 1, but at this time, the rebar joint coupler It is known that the restraint effect by 1 functions and the adhesion strength to the grout material 6 is improved.
そして、本実施の形態では、鉄筋継手用カプラー１を構成する鋼管として上記のとおり、接合しようとする鉄筋７の節径Ｌ２に応じた必要最小限の中空部断面径Ｌ１を有する鋼管を採用している。すると、粗面２と鉄筋７の節部７１との隙間も短小化されるため、鉄筋継手用カプラー１によるグラウト材６の拘束効果がより効率よく機能し、グラウト材６に対する付着強度をさらに高めることが可能となる。 Then, in the present embodiment, as described above, a steel pipe having a minimum necessary hollow sectional diameter L1 corresponding to the node diameter L2 of the reinforcing bar 7 to be joined is adopted as the steel pipe constituting the reinforcing bar joint coupler 1 ing. Then, since the gap between the rough surface 2 and the joint 71 of the reinforcing bar 7 is also shortened, the restraining effect of the grout material 6 by the rebar joint coupler 1 functions more efficiently, and the adhesion strength to the grout material 6 is further enhanced. It becomes possible.
このように、鉄筋継手用カプラー１は、接合しようとする鉄筋７の節径Ｌ２に応じて、必要最小限の中空部断面径Ｌ１を有する筒状体であればよく、その形状は製造方法に制限を受けることもないため、モルタル充填型機械式継手に用いられている従来のカプラーと比較して、大幅な小径化を図ることが可能となる。 As described above, the reinforcing bar joint coupler 1 may be a cylindrical body having a minimum necessary hollow section cross-sectional diameter L1 in accordance with the node diameter L2 of the reinforcing bar 7 to be joined, and the shape thereof is Since there is no restriction, it is possible to achieve a significant reduction in diameter as compared to the conventional couplers used in mortar-filled mechanical joints.
また、鉄筋継手用カプラー１の内周面に対して凹凸形状やリブを省略できることにより、一般市場に流通している鋼管の中から、接合しようとする鉄筋７の節径Ｌ２に応じて必要最小限の中空部断面径Ｌ１を有する鋼管を選択し、これを鉄筋継手用カプラー１に採用することができる。これにより、無駄な材料費を投じることなくコストを大幅に低減することが可能となるだけでなく、鉄筋継手用カプラー１の少量調達も可能となる。 In addition, the unevenness shape and ribs can be omitted with respect to the inner peripheral surface of the reinforcing bar coupler 1, so the minimum necessary for the joint diameter L2 of the reinforcing bars 7 to be joined out of steel pipes distributed in the general market. It is possible to select a steel pipe having a hollow section cross-sectional diameter L1 of the limit and adopt it as the reinforcing bar joint coupler 1. This not only makes it possible to significantly reduce the cost without investing unnecessary material costs, but also makes it possible to procure a small amount of the rebar joint coupler 1.
このような構成の鉄筋継手用カプラー１を用いて鉄筋７を接合し、これを例えば、図５（ｂ）で示すような、鉄筋コンクリート造の躯体２４に用いると、モルタル充填型機械式継手に用いられている従来のカプラーを用いる場合と比較して、鉄筋７からコンクリート２３の打設面に至るコンクリート２３のかぶり厚Ｌ４を小さくできる。これにより、鉄筋コンクリート造の躯体２４に対して、経済的な断面設計を行うことができ、施工費や材料費を大幅に削減することが可能となる。 When reinforcing bars 7 are joined using the coupler 1 for reinforcing bar joints having such a configuration, and this is used for a reinforced concrete housing 24 as shown in FIG. 5 (b), for example, it is used for mortar filled mechanical joints The cover thickness L4 of the concrete 23 from the reinforcing bar 7 to the placement surface of the concrete 23 can be reduced as compared with the case where the conventional coupler is used. As a result, economical cross-sectional design can be performed on the reinforced concrete frame 24, and construction costs and material costs can be significantly reduced.
本発明のモルタル充填型の機械式継手に用いる鉄筋継手用カプラー１は、上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更が可能である。 The reinforcing bar joint coupler 1 used for the mortar-filled mechanical joint of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.
例えば、本実施の形態では、鉄筋継手用カプラー１の内周面にのみ粗面２を設けたが、必ずしもこれに限定されるものではなく、図６（ａ）で示すように、内周面と外周面の両者を、第２の実施の形態で例示したような、粒状体４を混入させた接着剤３にて被覆し、粗面２を設けてもよい。 For example, in the present embodiment, the rough surface 2 is provided only on the inner circumferential surface of the reinforcing bar coupler 1, but the present invention is not necessarily limited to this, and as shown in FIG. Both the outer peripheral surface and the outer peripheral surface may be coated with the adhesive 3 mixed with the granular material 4 as exemplified in the second embodiment, and the rough surface 2 may be provided.
この場合には、図４（ａ）を参照して前述したように、粒状体４と接着剤３を混合撹拌させた混合物５を貯留した容器２２に、鉄筋継手用カプラー１を漬け込めばよい。その後、外周面の洗浄を行なわずに混合物５を硬化させることにより、鉄筋継手用カプラー１には、その内外周面に粗面２が形成される。もしくは、図４（ｂ）を参照して前述したような、吹付ノズル２１による混合物５の吹付け工程を、鉄筋継手用カプラー１の内外周面に行うとよい。 In this case, as described above with reference to FIG. 4A, the rebar joint coupler 1 may be dipped in a container 22 storing the mixture 5 in which the granular material 4 and the adhesive 3 are mixed and stirred. Thereafter, the mixture 5 is cured without washing the outer peripheral surface, whereby the rough surface 2 is formed on the inner and outer peripheral surfaces of the reinforcing bar joint coupler 1. Alternatively, the step of spraying the mixture 5 with the spray nozzle 21 as described above with reference to FIG. 4 (b) may be performed on the inner and outer peripheral surfaces of the rebar joint coupler 1.
このような、外周面にも粗面２を備えた鉄筋継手用カプラー１を用いて接合した鉄筋７を、図５（ｂ）で示すような、鉄筋コンクリート造の躯体２４を構築する場合に採用すると、鉄筋継手用カプラー１のコンクリート２３に対する付着性能を向上させることが可能となる。 If such a reinforcing bar 7 joined using a coupler 1 for a reinforcing bar joint having a rough surface 2 also on the outer peripheral surface is adopted when constructing a reinforced concrete frame 24 as shown in FIG. 5 (b) It is possible to improve the adhesion performance of the rebar joint coupler 1 to the concrete 23.
なお、鉄筋継手用カプラー１の内外周面に形成される粗面２は、必ずしも図６（ａ）で示すような、内外周面ともに、粒状体４が混入された接着剤３よりなる粗面２でなくてもよい。つまり、内外周面ともに図２（ａ）で示すような、接着剤３の表面に粒状体４を固着させた粗面２であってもよいし、内周面に、接着剤３に混入された粒状体４よりなる粗面２が設けられる一方で、外周面には、接着剤３の表面に粒状体４を固着させた粗面２が設けれていてもよい。 The rough surface 2 formed on the inner and outer peripheral surfaces of the rebar joint 1 is not necessarily the rough surface as shown in FIG. It does not have to be two. That is, both the inner and outer peripheral surfaces may be the rough surface 2 in which the granular material 4 is fixed to the surface of the adhesive 3 as shown in FIG. 2 (a). While the rough surface 2 made of the granular material 4 is provided, the rough surface 2 in which the granular material 4 is fixed to the surface of the adhesive 3 may be provided on the outer peripheral surface.
また、前述したように、接着剤３として使用しているポリビニルブチラール樹脂は、所定の膜厚を確保することにより防錆被膜として機能する。よって、例えば、図６（ｂ）で示すように、鉄筋継手用カプラー１の外周面には粗面２を備えず、接着剤３よりなる防錆被膜を設けてもよい。なお、防錆被膜として機能する膜厚としては、２２０±４０μｍを確保することが好ましい。 Further, as described above, the polyvinyl butyral resin used as the adhesive 3 functions as an anticorrosive film by securing a predetermined film thickness. Therefore, for example, as shown in FIG. 6 (b), the outer peripheral surface of the reinforcing bar coupler 1 may not be provided with the rough surface 2 but may be provided with an anticorrosive coating made of the adhesive 3. In addition, as a film thickness which functions as an antirust film, it is preferable to ensure 220 +/- 40 micrometers.
さらには、鉄筋継手用カプラー１の内周面や外周面に設ける粗面２において、接着剤３に防錆被膜として機能する膜厚を確保して、粗面２に耐食性能を付与してもよい。こうすると、鉄筋継手用カプラー１全体に高い耐食性能を付与することができることから、例えば臨海部等の塩化物に晒される環境に建設されるコンクリート構造物の鉄筋継手として、使用することが可能となる。 Furthermore, even in the rough surface 2 provided on the inner peripheral surface and the outer peripheral surface of the reinforcing bar joint coupler 1, the adhesive 3 secures a film thickness that functions as a rustproof coating, and the rough surface 2 is provided with corrosion resistance. Good. In this case, since it is possible to impart high corrosion resistance to the entire rebar joint coupler 1, it can be used, for example, as a rebar joint of a concrete structure to be constructed in an environment exposed to a chloride such as a seaside area. Become.
また、本実施の形態では、鉄筋継手用カプラー１に、中空部断面径Ｌ１が一様な鋼管を採用したが、必ずしもこれに限定されるものではない。内周面に接着剤３と粒状体４よりなる粗面２を形成でき、かつ中空部に充填されるグラウト材６に対して拘束効果を生じさせる程度の剛性を有する筒状体であれば、中空部断面径Ｌ１が中空軸方向に異なる鋼管等、いずれの筒状体を採用してもよい。 Moreover, in this Embodiment, although hollow part cross-sectional diameter L1 employ | adopted the steel pipe with a uniform hollow part coupler 1 to it, it is not necessarily limited to this. If it is a cylindrical body which can form the rough surface 2 consisting of the adhesive 3 and the granular material 4 on the inner peripheral surface and has a rigidity enough to produce a restraining effect on the grout material 6 filled in the hollow portion, You may employ | adopt any cylindrical bodies, such as a steel pipe from which hollow part cross-sectional diameter L1 differs in a hollow-axis direction.
具体的には、従来より鉄筋継手に用いられている、図７（ａ）で示すような転造ねじ加工により製造された凹凸形状を備える筒状体や、図７（ｂ）で示すような、中央部近傍に膨出部を備えた筒状体が、事例として挙げられる。 Specifically, a cylindrical body having a concavo-convex shape manufactured by rolling thread forming as shown in FIG. 7 (a), which has been conventionally used for reinforcing bar joints, or as shown in FIG. 7 (b) The cylindrical body provided with the bulging part in the central part vicinity is mentioned as an example.
なかでも、図７（ａ）で示すような、緩やかな凹凸形状を有する筒状体の内周面に粗面２を設けて鉄筋継手用カプラー１とすると、粗面２と凹凸形状の両者が相まって中空部に充填されたグラウト材６を、より強固に鉄筋継手用カプラー１に対して付着させることができる。したがって、鉄筋継手用カプラー１における凹凸形状の起伏量を小さくすることも可能であり、こうすると、鉄筋７を端部開口から中空部へ挿入しやすくなり、施工性を大幅に向上することが可能となる。 Above all, when the rough surface 2 is provided on the inner peripheral surface of the cylindrical body having a gentle concavo-convex shape as shown in FIG. 7 (a) to make the rebar joint coupler 1, both the rough surface 2 and the concavo-convex shape The grout material 6 filled in the hollow part together can be more firmly attached to the rebar joint coupler 1. Therefore, it is possible to reduce the amount of unevenness of the concavo-convex shape in the coupler 1 for rebar joint, which makes it easy to insert the rebar 7 from the end opening into the hollow portion, and the workability can be significantly improved. It becomes.
さらに、鉄筋継手用カプラー１の断面形状も円形に限定されるものではなく、角型や多角形等、いずれを採用してもよい。 Furthermore, the cross-sectional shape of the rebar joint coupler 1 is not limited to a circular shape, and may be square, polygonal, or the like.
１ 鉄筋継手用カプラー
１１ グラウト材注入口
２ 粗面
３ 接着剤
４ 粒状体
５ 混合物
６ グラウト材
７ 鉄筋
７１ 節部
２１ 吹付ノズル
２２ 容器
２３ コンクリート
２４ 鉄筋コンクリート造の躯体
Reference Signs List 1 coupler for reinforcing bar joint 11 grout injection port 2 rough surface 3 adhesive 4 granular material 5 mixture 6 grout 7 reinforcing bar 71 joint
21 spray nozzle 22 container 23 concrete 24 reinforced concrete frame
Claims (5)
前記中空部を形成する内周面に、該内周面を被覆する接着剤と、該接着剤にて保持された粒状体よりなる粗面を備えることを特徴とする鉄筋継手用カプラー。 A coupler for a reinforcing bar joint comprising a cylindrical body, in which a reinforcing bar is inserted from an end opening into the hollow portion thereof and is filled with a grout material,
A coupler for a reinforcing bar joint, comprising: an adhesive for covering the inner circumferential surface on the inner circumferential surface forming the hollow portion; and a rough surface comprising a granular body held by the adhesive.
前記粒状体が、珪砂であることを特徴とする鉄筋継手用カプラー。 In the coupler for rebar joint according to claim 1,
A coupler for a rebar joint characterized in that the granular body is silica sand.
前記中空部の断面径が、中空軸方向に異なることを特徴とする鉄筋継手用カプラー。 The coupler for rebar joint according to claim 1 or 2
A coupler for a reinforcing bar joint, wherein the cross-sectional diameter of the hollow portion is different in the hollow axis direction.
外周面に、前記粗面を備えることを特徴とする鉄筋継手用カプラー。 The coupler for rebar joint according to any one of claims 1 to 3,
A coupler for rebar joint characterized in that the rough surface is provided on the outer peripheral surface.
前記接着剤が、ポリビニルブチラールを主成分とするポリビニルブチラール樹脂であることを特徴とする鉄筋継手用カプラー。 The coupler for rebar joint according to any one of claims 1 to 4,
The coupler for a reinforcing bar joint, wherein the adhesive is a polyvinyl butyral resin containing polyvinyl butyral as a main component.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017173360A JP7009853B2 (en) | 2017-09-08 | 2017-09-08 | Coupler for rebar joints |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017173360A JP7009853B2 (en) | 2017-09-08 | 2017-09-08 | Coupler for rebar joints |
Publications (2)
| Publication Number | Publication Date |
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| JP2019049125A true JP2019049125A (en) | 2019-03-28 |
| JP7009853B2 JP7009853B2 (en) | 2022-01-26 |
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| JPH01165856A (en) * | 1987-12-21 | 1989-06-29 | Kajima Corp | Connecting structure of pc steel bar and fiber-reinforced plastic bar |
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| JP2013147923A (en) * | 2011-12-21 | 2013-08-01 | Fuji Bolt Seisakusho:Kk | Method of formation of compression-bonded structure |
| WO2016117384A1 (en) * | 2015-01-19 | 2016-07-28 | 国立大学法人 鹿児島大学 | Structure manufacturing method, joint, rod having joint and construction member |
| JP2017043898A (en) * | 2015-08-24 | 2017-03-02 | 株式会社大林組 | Rust-proof deformed bar |
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2017
- 2017-09-08 JP JP2017173360A patent/JP7009853B2/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS534318A (en) * | 1976-05-14 | 1978-01-14 | Ccl Systems Ltd | Method of mounting sleeve in metal to concrete reinforced bar |
| JPH01165856A (en) * | 1987-12-21 | 1989-06-29 | Kajima Corp | Connecting structure of pc steel bar and fiber-reinforced plastic bar |
| JPH08135092A (en) * | 1994-11-14 | 1996-05-28 | Nkk Corp | Grout filling type reinforcing joint sleeve |
| US20110036049A1 (en) * | 2009-08-11 | 2011-02-17 | Oliva Michael G | Splice System for Connecting Rebars in Concrete Assemblies |
| JP2013147923A (en) * | 2011-12-21 | 2013-08-01 | Fuji Bolt Seisakusho:Kk | Method of formation of compression-bonded structure |
| CN103216044A (en) * | 2012-01-20 | 2013-07-24 | 中冶建筑研究总院有限公司 | Moisture permeation and water proofing Cement grouting steel bar connecting structure of precast concrete unit |
| WO2016117384A1 (en) * | 2015-01-19 | 2016-07-28 | 国立大学法人 鹿児島大学 | Structure manufacturing method, joint, rod having joint and construction member |
| JP2017043898A (en) * | 2015-08-24 | 2017-03-02 | 株式会社大林組 | Rust-proof deformed bar |
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| JP7009853B2 (en) | 2022-01-26 |
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