JP2020012300A - Construction method of residual form to prevent salt damage and frost damage of precast residual form panel - Google Patents
Construction method of residual form to prevent salt damage and frost damage of precast residual form panel Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 150000003839 salts Chemical class 0.000 title claims abstract description 24
- 239000004567 concrete Substances 0.000 claims abstract description 58
- 238000000576 coating method Methods 0.000 claims abstract description 54
- 239000011248 coating agent Substances 0.000 claims abstract description 53
- 238000002955 isolation Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 6
- 239000003973 paint Substances 0.000 claims abstract description 4
- 238000001764 infiltration Methods 0.000 claims abstract description 3
- 230000008595 infiltration Effects 0.000 claims abstract description 3
- 238000009415 formwork Methods 0.000 claims description 87
- 239000004568 cement Substances 0.000 claims description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 20
- 239000003566 sealing material Substances 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 230000008018 melting Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 5
- 239000000356 contaminant Substances 0.000 claims description 4
- 239000011800 void material Substances 0.000 claims description 4
- 238000011109 contamination Methods 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 2
- 230000001629 suppression Effects 0.000 claims 1
- 230000001771 impaired effect Effects 0.000 abstract description 4
- 239000002184 metal Substances 0.000 description 18
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
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- Foundations (AREA)
- Retaining Walls (AREA)
Abstract
Description
本発明は、プレキャスト製残存型枠パネルの塩害及び凍害を抑止できる残存型枠の施工方法に関するものである。 TECHNICAL FIELD The present invention relates to a method of constructing a residual formwork capable of suppressing salt damage and frost damage of a precast residual form panel.
コンクリート壁面を化粧被覆する工法として、プレキャスト製残存型枠パネルを立設し、そのプレキャスト製残存型枠パネルの背面にコンクリートを打設する残存型枠構築方法が知られている。
従来の残存型枠構築方法では、図６（ａ）に示すように、背面に被連結金具１０３が設けられたプレキャスト製残存型枠パネル１０１が使用されている。このプレキャスト製残存型枠パネル１０１の背面には、クレーターＵやレイタンス層Ｌが多く存在する。被連結金具１０３は、プレキャスト製残存型枠パネル１０１の背面から突出し、露出されている。
As a method of decoratively covering a concrete wall surface, there is known a method of constructing a residual formwork in which a precast residual formwork panel is erected and concrete is cast on the back of the precast residual formwork panel.
In the conventional method of constructing a residual formwork, as shown in FIG. 6A, a precast residual formwork panel 101 having a metal fitting 103 provided on the back surface is used. Many craters U and latence layers L are present on the back of the precast remaining form panel 101. The connected metal fitting 103 projects from the back surface of the precast remaining form panel 101 and is exposed.
この残存型枠構築方法は、図６（ａ）及び（ｂ）に示すように、例えば、鋼矢板１０４の前面に、プレキャスト製残存型枠パネル１０１を幅方向Ｘ、及び高さ方向Ｙに積み重ね、鋼製の連結金具（セパレータ）１１１を介して、被連結金具１０３と鋼矢板１０４とを連結し、残存型枠１１０を構築した後に、プレキャスト製残存型枠パネル１０１の背面と鋼矢板１０４との間にコンクリート１１２を打設し、硬化させる。硬化する際、コンクリート１１２が収縮し、ひび割れ変位が生じ、コンクリート１１２にはひび割れＣ２が生じる。そして、このひび割れＣ２が生じると、プレキャスト製残存型枠パネル１０１に対し幅方向Ｘに引き裂く力が生じるため、プレキャスト製残存型枠パネル１０１には、ひび割れＣ１が生じる。プレキャスト製残存型枠パネル１０１の表面にひび割れＣ１が生じると、外観上好ましくないことに加え、プレキャスト製残存型枠パネル１０１の長期耐久性が低下するおそれがある。具体的には、図７に示したように、プレキャスト製残存型枠パネルの表面に複数のひび割れが生じる。 As shown in FIGS. 6A and 6B, this method of constructing a residual formwork includes, for example, stacking a precast residual formwork panel 101 on a front surface of a steel sheet pile 104 in a width direction X and a height direction Y. After connecting the connected metal fitting 103 and the steel sheet pile 104 via the steel connecting metal fitting (separator) 111 to construct the residual formwork 110, the back surface of the precast residual formwork panel 101, the steel sheet pile 104, The concrete 112 is poured in between and hardened. When hardened, the concrete 112 shrinks, causing a crack displacement, and the concrete 112 has a crack C2. When the crack C2 occurs, a force for tearing the precast residual form panel 101 in the width direction X is generated, so that the precast residual form panel 101 has a crack C1. If cracks C1 occur on the surface of the precast residual form panel 101, the long-term durability of the precast residual form panel 101 may be deteriorated in addition to being undesirable in appearance. Specifically, as shown in FIG. 7, a plurality of cracks are generated on the surface of the remaining precast formwork panel.
このひび割れは、コンクリートの原料に含まれる水分が蒸発し、コンクリートが収縮することで生じる。構造物に生じるひび割れが許容される範囲は、「許容ひび割れ幅」として、日本工業規格やＡＣＩ委員会によって規定されている（非特許文献１）。この許容ひび割れ幅は、構造物の種類や構造物の周囲の環境によって異なるが、約０．０５から０．４０ｍｍである。 The cracks are caused by the moisture contained in the concrete raw material evaporating and the concrete shrinking. The range in which cracks generated in a structure are allowed is defined by the Japanese Industrial Standards and the ACI Committee as "allowable crack width" (Non-Patent Document 1). The allowable crack width varies depending on the type of the structure and the environment around the structure, but is about 0.05 to 0.40 mm.
コンクリートのひび割れは、コンクリートの骨材、乾燥収縮、温度等のコンクリート特有の性質によって生じる自己ひずみひび割れと、建築物の重量や地震力などによる荷重を受けることによって生じる構造ひび割れに分けられている。この自己ひずみひび割れは、主に、乾燥収縮ひび割れ、沈みひび割れ、温度ひび割れ、凍結融解ひび割れに分類される。中でも、乾燥収縮ひび割れは、コンクリートのひび割れの中でも最も頻度が多いことが知られている。 Cracks in concrete are classified into self-strain cracks caused by concrete properties such as aggregate, drying shrinkage, and temperature of concrete, and structural cracks caused by receiving loads such as the weight of buildings and seismic force. The self-strain cracks are mainly classified into dry shrinkage cracks, sink cracks, temperature cracks, and freeze-thaw cracks. Among them, it is known that dry shrinkage cracks are the most frequent among concrete cracks.
乾燥収縮ひび割れとは、例えば、壁などの部材にコンクリートの収縮が生じないように拘束されると、コンクリートには引張力が生じ、この引張力がコンクリートの引張強度を超えたときに生じるひび割れである。そして、この乾燥収縮ひび割れは、面積が広い構造物や、端部が剛性の高い構造物で拘束された場合に生じやすい。この乾燥収縮ひび割れを防止するために、例えば、コンクリートの水分量を減らしたり、収縮量に対応した膨張剤をコンクリートに混合したりする方法が行われている（例えば、特許文献１）。 Dry shrinkage cracks are, for example, cracks that occur when concrete is constrained on a member such as a wall so that the concrete does not shrink, and a tensile force is generated in the concrete, and the tensile force exceeds the tensile strength of the concrete. is there. The drying shrinkage cracks are likely to occur when a structure having a large area or an end is restrained by a structure having high rigidity. In order to prevent the drying shrinkage cracks, for example, a method of reducing the water content of the concrete or mixing a swelling agent corresponding to the shrinkage amount with the concrete has been performed (for example, Patent Document 1).
特許文献１のように、セメント材の水分量を減らしたり、収縮量に対応した膨張剤をセメント材に混合したりする方法では、膨張剤を混合させる分だけコストがかかることに加え、コンクリートの水分量を減少させるため、コンクリートの流動性が悪くなり、複雑な隙間（空間）に適切にコンクリートが打設できないおそれがあることに加え、硬化後、所望の強度が得られないおそれもある。また、プレキャスト製残存型枠パネルの表面までひび割れが生じた場合、外観を損なわないようにひび割れ部分に粉体を塗布し、ひび割れを化粧する対応がなされている。しかし、粉体を塗布する作業時間とコストが生じるという問題に加え、時間が経過すると粉体が残存型枠から剥がれ落ちてしまい、再度ひび割れが露出するという問題があった。 In the method of reducing the water content of the cement material or mixing the expanding agent corresponding to the amount of shrinkage with the cement material as in Patent Document 1, in addition to the cost of mixing the expanding agent, the cost of the concrete is increased. In order to reduce the amount of water, the fluidity of the concrete deteriorates, and concrete may not be properly poured into complicated gaps (spaces). In addition, a desired strength may not be obtained after curing. In addition, when cracks occur up to the surface of the precast residual formwork panel, powder is applied to the cracked portions so as not to impair the appearance, and the cracks are applied. However, in addition to the problem that the work time and cost for applying the powder are generated, there is a problem that the powder is peeled off from the remaining mold over time, and the crack is exposed again.
上記問題点を解消するために、発明者は、プレキャスト製残存型枠パネルのひび割れ抑止方法を提案している（特許文献２）。特許文献２のプレキャスト製残存型枠パネルのひび割れ抑止方法は、プレキャスト製残存型枠パネルのパネル本体の背面から少なくとも１０ｍｍの範囲を弾性樹脂製カバー材で覆われた被連結金具がプレキャスト製残存型枠パネル本体の背面の所定の位置に設けられ、被連結金具と鋼製の連結金具（セパレータ）とを連結して残存型枠を構築した後に、プレキャスト製残存型枠パネルの背面にコンクリートを打設するコンクリート打設工程と、コンクリートを打設した後、コンクリートを硬化させるコンクリート硬化工程を含むものである。このプレキャスト製残存型枠パネルのひび割れ抑止方法において、被連結金具の弾性樹脂製カバー材で覆われた部分は、コンクリートによって固められず、コンクリート硬化工程においてコンクリートの収縮によって生じるひび割れ変位が、弾性樹脂製カバー材の弾性変位追従機能と被連結金具の弾性変位追従機能によって、パネル本体にほとんど伝わらないことにより、施工した後に、プレキャスト製残存型枠パネルにひび割れが生じ、劣化することが抑止される。 In order to solve the above problem, the inventor has proposed a method for suppressing cracks in a precast residual form panel (Patent Document 2). Patent Literature 2 discloses a method for suppressing cracks in a precast residual form panel. The connected metal fitting covered with an elastic resin cover material covers at least 10 mm from the back surface of the panel body of the precast residual form panel. After being provided at a predetermined position on the back surface of the frame panel body and connecting the connected metal fittings and the steel connecting metal fittings (separator) to construct a residual formwork, concrete is cast on the rear surface of the precast residual formwork panel. And a concrete hardening step of hardening the concrete after casting the concrete. In this method for suppressing cracks in the precast residual form panel, the portion of the metal fitting to be connected which is covered with the elastic resin cover material is not solidified by concrete, and the crack displacement caused by shrinkage of the concrete in the concrete hardening step is caused by the elastic resin. Due to the elastic displacement following function of the cover material and the elastic displacement following function of the connected fitting, it is hardly transmitted to the panel body, so that cracks are generated in the precast residual formwork panel after construction and deterioration is suppressed. .
プレキャスト製残存型枠パネルの劣化する要因は、コンクリートの収縮によって生じるひび割れ以外に、塩害や凍害が挙げられる。プレキャスト製残存型枠パネル本体は、一般的に、コンクリートで構成され、内部に補強材としての鉄筋が組み込まれている。このプレキャスト製残存型枠パネル本体に、例えば、融雪剤から溶出した塩水が侵入した場合、塩害を引き起こし、図８（ａ）及び（ｂ）に示すように、コンクリートの破損や鉄筋の腐食を進行させ、コンクリートの耐久性が低下する。また、寒冷地では、プレキャスト製残存型枠パネル本体の内部に侵入した水の凍結・融解が繰り返されることで、凍害が生じる。このような塩害や凍害が生じると、ひび割れ、変形、剥離が生じ、プレキャスト製残存型枠パネルの耐久性が低下したり、残存型枠の外観を損ねたりするおそれがあり、残存型枠を長期間、所望の状態で維持できなくなるおそれがある。 Factors that cause deterioration of the precast remaining form panel include cracking caused by shrinkage of concrete, salt damage and frost damage. The precast remaining form panel body is generally made of concrete, and has a reinforcing bar incorporated therein as a reinforcing material. For example, when salt water eluted from a snow melting agent enters the precast remaining form panel body, salt damage is caused, and as shown in FIGS. 8A and 8B, concrete damage and corrosion of reinforcing steel progress. And the durability of the concrete decreases. In a cold region, freezing and thawing of water that has entered the interior of the precast residual form panel body is repeated, causing frost damage. If such salt damage or frost damage occurs, cracks, deformation, and peeling may occur, and the durability of the precast residual form panel may be reduced or the appearance of the residual form may be impaired. During the period, it may not be possible to maintain a desired state.
さらに、打設されたセメント系固結材から生じる汚染物を含有した余剰水が、プレキャスト製残存型枠パネルの背面からおもて面にしみ出したり、隣接するプレキャスト製残存型枠パネル本体同士の目地部から漏れ出したりすることで、プレキャスト製残存型枠パネル本体の表面が汚染される（図８）。このように、プレキャスト製残存型枠の表面が汚染されると、構築後の残存型枠の外観が著しく損なわれる。 In addition, surplus water containing contaminants generated from the cast cement-based consolidated material leaks out from the back of the precast residual form panel to the front surface, or the adjacent precast residual form panel bodies come into contact with each other. Leaks from the joints of the preform, the surface of the precast remaining form panel body is contaminated (FIG. 8). As described above, when the surface of the precast residual form is contaminated, the appearance of the residual form after construction is significantly impaired.
本発明は、残存型枠を長期間、安定して維持できることに加え、残存型枠の外観が損なわれることを回避できる残存型枠の施工方法を提供することを目的とする。 An object of the present invention is to provide a method of constructing a remaining formwork that can stably maintain the remaining formwork for a long period of time and that can prevent the appearance of the remaining formwork from being impaired.
本発明に係る残存型枠の施工方法は、内部に毛細管空隙を有するプレキャスト製残存型枠パネル本体の背面に防水機能を有する塗料を塗布することで、プレキャスト製残存型枠パネル本体の背面に、毛細管空隙の入口を覆う隔離塗布膜が設けられたプレキャスト製残存型枠パネルを用いて、残存型枠を構築する残存型枠構築工程と、残存型枠を構築した後に、プレキャスト製残存型枠パネルの背面に、コンクリート等のセメント系固結材を打設するセメント系固結材打設工程と、セメント系固結材を打設した後に、セメント系固結材を硬化させるセメント系固結材硬化工程とを含み、隔離塗布膜を形成することで、プレキャスト製残存型枠パネル本体の背面とセメント系固結材とが固着されないと共に、隔離塗布膜とセメント系固結材との間に、肌別れ隙間が形成され、セメント系固結材硬化工程において、セメント系固結材の収縮によって生じるひび割れ変位がプレキャスト製残存型枠パネル本体にほとんど伝わらず、施工した後に、プレキャスト製残存型枠パネル本体にひび割れが生じることが抑止され、かつ、硬化したセメント系固結材側に侵入した雨水や融雪剤から溶出した塩水が、プレキャスト製残存型枠パネル本体の毛細管空隙へ浸水することを防止することにより、プレキャスト製残存型枠パネルの凍害や塩害を抑止することを特徴とする。 The method for constructing the residual formwork according to the present invention is to apply a waterproof coating on the back of the precast residual formwork panel body having a capillary void therein, on the back side of the precast residual formwork panel body, Using a precast residual form panel provided with an isolation coating film covering the entrance of the capillary gap, a residual form forming step of constructing the residual form, and after constructing the residual form, the precast residual form panel A cement-based cement setting process of casting a cement-based cement such as concrete on the back of the cement-based cement, and a cement-based cement that hardens the cement-based cement after casting the cement-based cement Forming the isolation coating film, the back surface of the precast residual form panel body and the cement-based binder are not fixed to each other, and between the isolation coating film and the cement-based binder. In the hardening process of cement-based cement, cracking displacement caused by shrinkage of the cement-based cement is hardly transmitted to the precast residual formwork panel body. Cracking of the panel body is suppressed, and rainwater and salt water eluted from the snow melting agent that has penetrated into the hardened cementitious cementing material are prevented from entering the capillary gap of the remaining precast form panel body. By doing so, frost damage and salt damage of the precast residual form panel are suppressed.
本発明に係る残存型枠の施工方法は、隣接するプレキャスト製残存型枠パネルの隔離塗布膜の端部同士をシーリング材でつなぎ合わせることで、プレキャスト製残存型枠パネルの背面全域を、隔離塗布膜とシーリング材とで覆い、つなぎ合わされた隔離塗布膜によって、プレキャスト製残存型枠パネルの背面全域とセメント系固結材とが隔離されることで、打設されたセメント系固結材から生じる汚染物を含有した汚染水、硬化したセメント系固結材側に侵入した水や融雪剤から溶出した塩水が、プレキャスト製残存型枠パネル側に流れ込むことを防止することにより、プレキャスト製残存型枠パネル本体の毛細管空隙や目地部の隙間への浸水を防止することにより、プレキャスト製残存型枠パネルの表面の汚染、及び凍害や塩害を抑止することを特徴とする。 The method of constructing a residual formwork panel according to the present invention includes connecting the ends of the isolation coating films of the adjacent precast residual formwork panels with a sealing material so that the entire back surface of the precast residual formwork panel is isolated and coated. The entire back surface of the precast residual form panel is separated from the cement-based binder by the separated coating film that is covered with the membrane and the sealing material and joined together, resulting from the cast cement-based binder. Precast residual formwork is prevented by preventing contaminated water containing contaminants, water that has infiltrated the hardened cementitious cemented material side and salt water eluted from the snow melting agent from flowing into the precast residual formwork panel side. Prevents infiltration into capillary voids and joints in the panel body to prevent contamination of the surface of the remaining precast formwork panel, as well as frost damage and salt damage. And wherein the door.
本発明に係る残存型枠の施工方法は、プレキャスト製残存型枠パネル本体の背面に、防水機能を有する塗料を塗布し、プレキャスト製残存型枠パネル本体の背面に隔離塗布膜を設ける。この隔離塗布膜を設けることで、プレキャスト製残存型枠パネル本体の内部に形成される毛細管空隙の入り口を塞ぐ。そうすると、硬化したセメント系固結材側に侵入した雨水や融雪剤から溶出した塩水が、プレキャスト製残存型枠パネル本体の毛細管空隙（プレキャスト製残存型枠パネル本体の内部）へ浸水することが防止される。そのため、プレキャスト製残存型枠パネル本体に対する凍害や塩害を抑止することができ、プレキャスト製残存型枠パネル本体が劣化、破損、変形すること、及びプレキャスト製残存型枠パネルの補強材である鉄筋が腐食することを回避できる。
したがって、本発明に係る残存型枠の施工方法により施工した後、残存型枠の外観を保つと共に、長期間、耐久性能を低下させずに、安定して、残存型枠を維持できる。
In the method for applying a residual formwork according to the present invention, a paint having a waterproof function is applied to the back of the precast residual formwork panel body, and an isolation coating film is provided on the backside of the precast residual formwork panel body. By providing this isolation coating film, the entrance of the capillary gap formed inside the precast residual form panel body is closed. This prevents the rainwater and salt water eluted from the snow-melting agent that have infiltrated into the hardened cementitious cementing material from infiltrating into the capillary gap of the precast residual formwork panel body (the interior of the precast residual formwork panel body). Is done. Therefore, frost damage and salt damage to the precast residual formwork panel body can be suppressed, and the precast residual formwork panel body deteriorates, breaks, and deforms, and the reinforcing bar of the precast residual formwork panel reinforces. Corrosion can be avoided.
Therefore, after the construction of the residual form according to the present invention, the appearance of the residual form can be maintained, and the residual form can be stably maintained for a long time without deteriorating the durability performance.
本発明に係る残存型枠の施工方法は、隔離塗布膜を背面に設けたプレキャスト製残存型枠パネルを使用する。この隔離塗布膜は、防水機能を有する塗料を塗布して毛細管空隙の入り口を覆うように設けられる。そうすると、隔離塗布膜が形成されるため、セメント系固結材が固着されないと共に、隔離塗布膜とセメント系固結材との間に、肌別れ隙間が形成される。
この肌別れ隙間が形成されると、セメント系固結材硬化工程において、セメント系固結材の収縮により、幅方向にひび割れ変位（プレキャスト製残存型枠パネルが引き裂かれる力）が生じても、このひび割れ変位はプレキャスト製残存型枠パネル本体にほとんど伝わらない。
したがって、残存型枠を施工した後、プレキャスト製残存型枠パネル本体にひび割れが生じることが抑止される。
The method for constructing a residual formwork according to the present invention uses a precast residual formwork panel provided with an isolation coating film on the back surface. The isolation coating film is provided so as to cover the entrance of the capillary space by applying a coating material having a waterproof function. Then, the isolation coating film is formed, so that the cement-based binder is not fixed, and a skin separation gap is formed between the isolation coating film and the cement-based binder.
When the skin separation gap is formed, in the cement-based cement hardening step, even if a crack displacement (force for tearing the remaining precast form panel) occurs in the width direction due to shrinkage of the cement-based cement, This crack displacement is hardly transmitted to the remaining precast form panel body.
Therefore, after the remaining formwork is constructed, the occurrence of cracks in the precast residual formwork panel body is suppressed.
プレキャスト製残存型枠パネル本体に形成された毛細管空隙は、プレキャスト製残存型枠パネル本体の背面と表面を連通している。セメント系固結材硬化工程において、セメント系固結材に含まれている水分は、この毛細管空隙を介して、プレキャスト製残存型枠パネル本体の外側に放出され、蒸発する。
本実施形態に係る残存型枠の施工方法は、背面に形成されている毛細管空隙の入り口が塞がれているプレキャスト製残存型枠パネルを使用するため、毛細管空隙からセメント系固結材の水分が蒸発することが抑制される。そうすると、セメント系固結材は、急激に固結することが抑制され、徐々に固結されるため、ひび割れが生じにくくなる。
したがって、残存型枠を施工した後、プレキャスト製残存型枠パネル本体にひび割れが生じることが抑止される。
Capillary voids formed in the precast residual form panel main body communicate the back surface and the surface of the precast residual form panel main body. In the cement-based cement hardening step, the moisture contained in the cement-based cement is released to the outside of the precast residual form panel body through the capillary gap and evaporates.
The method for installing the residual formwork according to the present embodiment uses a precast residual formwork panel in which the entrance of the capillary space formed on the back surface is closed, so that the moisture of the cement-based cement is removed from the capillary space. Is suppressed from evaporating. Then, the cement-based consolidated material is restrained from being rapidly consolidated and is gradually consolidated, so that cracks are less likely to occur.
Therefore, after the remaining formwork is constructed, the occurrence of cracks in the precast residual formwork panel body is suppressed.
本発明の残存型枠の施工方法は、隣接するプレキャスト製残存型枠パネルの隔離塗布膜の端部同士をシーリング材でつなぎ合わされ、プレキャスト製残存型枠パネルの背面全域が隔離塗布膜とシーリング材で覆われる。このつなぎ合わされた隔離塗布膜によって、プレキャスト製残存型枠パネルの背面全域とセメント系固結材とが隔離されるため、打設されたセメント系固結材から生じる汚染物を含有した汚染水、硬化したセメント系固結材側に侵入した水や融雪剤から溶出した塩水が、プレキャスト製残存型枠パネル側に流れ込むことを防止できる。そうすると、汚染水や塩水が、プレキャスト製残存型枠パネル本体の毛細管空隙や目地部の隙間へ侵入することを防止でき、プレキャスト製残存型枠パネルの表面が汚染されること、及びプレキャスト製残存型枠に対し、凍害や塩害が生じることを抑止できる。 In the method for applying a residual formwork of the present invention, the end portions of the isolation coating films of the adjacent precast residual form panels are joined together with a sealing material, and the entire back surface of the precast residual form panel is sealed with the isolation coating film and the sealing material. Covered with. By this joined isolation coating film, the entire back surface of the remaining precast formwork panel and the cement-based cement are isolated from each other, so contaminated water containing contaminants generated from the cast cement-based cement, It is possible to prevent water that has infiltrated into the hardened cementitious cemented material or salt water eluted from the snow melting agent from flowing into the precast residual form panel side. By doing so, it is possible to prevent the contaminated water or salt water from entering the capillary gap or the gap of the joint portion of the precast residual form panel body, and contaminate the surface of the precast residual form panel, and prevent the precast residual form panel from being contaminated. Freezing and salt damage to the frame can be suppressed.
本実施形態に係る残存型枠の施工方法（以下、「施工方法」と記す。）は、プレキャスト製残存型枠パネルを用いて残存型枠を構築するものである。
以下、本実施形態に係る施工方法、及びこの施工方法に使用するプレキャスト製残存型枠パネルを、図１から図３を参照し、説明する。
なお、図面上、プレキャスト製残存型枠の横方向を幅方向Ｘ、縦方向を高さ方向Ｙ、厚み方向を前後方向Ｚと記す。
The method for constructing the residual formwork according to the present embodiment (hereinafter referred to as “construction method”) is to construct the residual formwork by using a precast residual formwork panel.
Hereinafter, a construction method according to the present embodiment and a precast residual form panel used in the construction method will be described with reference to FIGS. 1 to 3.
In the drawings, the horizontal direction of the remaining precast formwork is referred to as width direction X, the vertical direction is referred to as height direction Y, and the thickness direction is referred to as front-rear direction Z.
本実施形態に係る施工方法では、図１に示したプレキャスト製残存型枠パネル１を使用する。このプレキャスト製残存型枠パネル１は、図１（ａ）に示すように、プレキャスト製残存型枠パネル本体２と、プレキャスト製残存型枠パネル本体２の背面２ａの所定の位置に設けられた複数の被連結金具３と、プレキャスト製残存型枠パネル本体２の背面２ａに密着して形成された隔離塗布膜４とを備えている。 In the construction method according to the present embodiment, the precast residual form panel 1 shown in FIG. 1 is used. As shown in FIG. 1A, the precast residual form panel 1 includes a precast residual form panel main body 2 and a plurality of precast residual form panel panels 2 provided at predetermined positions on a back surface 2a of the precast residual form panel main body 2. And the isolation coating film 4 formed in close contact with the back surface 2a of the precast residual form panel main body 2.
［プレキャスト製残存型枠パネル本体２］
プレキャスト製残存型枠パネル本体２は、図１（ａ）及び（ｂ）に示すように、矩形状であり、その背面２ａには、クレーターＵ及びレイタンス層Ｌが形成されている。そして、プレキャスト製残存型枠パネル本体２の背面２ａには、幅方向Ｘ及び高さ方向Ｙに２つずつ被連結金具３が設けられている。この被連結金具３は、プレキャスト製残存型枠パネル本体２の背面２ａから突出するように設けられている。
プレキャスト製残存型枠パネル本体２のサイズは、例えば、高さ３００ｍｍ、幅９００ｍｍものが使用される。また、プレキャスト製残存型枠パネル本体２の内部の幅方向Ｘ及び高さ方向Ｙには、プレキャスト製残存型枠パネル本体２の強度を確保するために、複数の鉄筋５が設けられている。
また、プレキャスト製残存型枠パネル本体２の内部には、製造の際に毛細管空隙９が形成される。
[Precast residual formwork panel body 2]
As shown in FIGS. 1A and 1B, the precast remaining form panel main body 2 has a rectangular shape, and a crater U and a latence layer L are formed on the back surface 2a. Two metal fittings 3 are provided on the back surface 2a of the precast residual form panel body 2 in the width direction X and the height direction Y. The metal fitting 3 is provided so as to protrude from the back surface 2 a of the precast residual form panel body 2.
The size of the precast remaining form panel body 2 is, for example, 300 mm in height and 900 mm in width. Further, a plurality of reinforcing bars 5 are provided in the width direction X and the height direction Y inside the precast residual form panel body 2 in order to secure the strength of the precast residual form panel body 2.
In addition, a capillary space 9 is formed inside the precast residual form panel body 2 at the time of manufacture.
［被連結金具３］
被連結金具３は、フック部６と、このフック部６の両端に連結された埋設部７とを備えている。被連結金具３は、埋設部７がプレキャスト製残存型枠パネル本体２の内部に埋め込まれ、フック部６をプレキャスト製残存型枠パネル本体２の背面２ａから突出させ、プレキャスト製残存型枠パネル本体２に設けられる。この被連結金具３には、金属製のものを使用でき、耐食性に優れた素材を使用することが好ましく、例えば、ステンレス鋼材（ＳＵＳ３０４）が使用できる。
被連結金具３が背面２ａから突出している部分は、隔離塗布膜４ａで被覆されている。本実施形態では、この隔離塗布膜４ａは、後述する隔離塗布膜４と同じものを使用する。
[Connected metal fitting 3]
The connected metal fitting 3 includes a hook portion 6 and embedded portions 7 connected to both ends of the hook portion 6. The buried portion 7 is embedded in the precast residual form panel main body 2, the hook portion 6 is projected from the back surface 2 a of the precast residual form panel main body 2, and the precast residual form panel body is connected. 2 is provided. The metal fitting 3 can be made of metal, and is preferably made of a material having excellent corrosion resistance. For example, stainless steel (SUS304) can be used.
The portion of the metal fitting 3 projecting from the back surface 2a is covered with an isolation coating film 4a. In the present embodiment, the same isolation coating film 4a as described later is used as the isolation coating film 4a.
［隔離塗布膜４］
隔離塗布膜４は、防水機能を有する樹脂塗料をプレキャスト製残存型枠パネル本体２の背面に塗布し、乾燥させることで形成される。隔離塗布膜４は、防水機能に加え、弾性機能、耐アルカリ性を備えていることが好ましい。この樹脂塗料には、例えば、塩化ビニル樹脂塗料、アクリルウレタン樹脂塗料、カチオンエポキシ樹脂塗料を使用することができる。
[Isolation coating film 4]
The isolation coating film 4 is formed by applying a resin paint having a waterproof function to the back surface of the precast remaining form panel main body 2 and drying it. The isolation coating film 4 preferably has an elastic function and an alkali resistance in addition to the waterproof function. As the resin coating, for example, a vinyl chloride resin coating, an acrylic urethane resin coating, or a cationic epoxy resin coating can be used.
次に、プレキャスト製残存型枠パネル１を使用した施工方法について、説明する。
なお、残存型枠の施工方法で使用するセメント系固結材には、水分を含み、経時的に固化するものであれば使用でき、例えば、コンクリート、モルタル、気泡モルタル等を使用することができる。本実施形態では、セメント系固結材として、コンクリート１２を使用した例について説明する。
Next, a construction method using the precast residual form panel 1 will be described.
In addition, the cement-based cement used in the method of applying the remaining form can be used as long as it contains moisture and solidifies with time. For example, concrete, mortar, cellular mortar, and the like can be used. . In this embodiment, an example in which concrete 12 is used as a cement-based solidifying material will be described.
［残存型枠構築工程］
本実施形態に係る施工方法は、図２（ｂ）に示すように、プレキャスト製残存型枠パネル本体２の背面２ａに隔離塗布膜４が設けられたプレキャスト製残存型枠パネル１を積み重ね、残存型枠１０を構築する。この際、被連結金具３と木製型枠（コンパネ）１３に接続された鋼製の連結金具（セパレータ）１１によって連結することで、木製型枠１３の前面にプレキャスト製残存型枠パネル１が固定される。
[Remaining formwork construction process]
As shown in FIG. 2 (b), the construction method according to the present embodiment is to stack the precast residual form panels 1 provided with the isolation coating film 4 on the back surface 2a of the precast residual form panel body 2, Build the formwork 10. At this time, the precast residual formwork panel 1 is fixed to the front of the wooden formwork 13 by being connected by the steel connection form (separator) 11 connected to the connected fitting 3 and the wooden formwork (panel) 13. Is done.
［シーリング材被覆工程］
次に、図３に示すように、隣接するプレキャスト製残存型枠パネル１の隔離塗布膜４の上下左右の端部をシーリング材１４によって、隔離塗布膜４の端部同士をつなぎ合わせる。隔離塗布膜４の端部同士をつなぎ合わせることで、プレキャスト製残存型枠パネル１の背面２ａ全域が、つなぎ合わされた隔離塗布膜４とシーリング材１４で完全に覆われる。このシーリング材１４には、例えば、シリコンシーリング材や防水テープを使用することができる。
[Sealing material coating process]
Next, as shown in FIG. 3, the upper, lower, left, and right ends of the isolation coating film 4 of the adjacent precast residual form panel 1 are joined to each other with sealing materials 14. By joining the ends of the isolation coating film 4 together, the entire back surface 2 a of the precast residual form panel 1 is completely covered with the joined isolation coating film 4 and sealing material 14. As the sealing material 14, for example, a silicone sealing material or a waterproof tape can be used.
［セメント系固結材打設工程］
プレキャスト製残存型枠パネル１の背面２ａ全域をつなぎ合わされた隔離塗布膜４で覆った後、プレキャスト製残存型枠パネル１と木製型枠１３との間にコンクリート１２を打設する（図２（ａ））。プレキャスト製残存型枠パネル本体２の背面２ａ全域が隔離塗布膜４とシーリング材１４によって覆われているため、コンクリート１２は、プレキャスト製残存型枠パネル本体２の背面２ａに接触することなく打設される。
[Cement-based cement setting process]
After covering the entire back surface 2a of the precast residual form panel 1 with the joined isolation coating film 4, concrete 12 is poured between the precast residual form panel 1 and the wooden form 13 (FIG. 2 ( a)). Since the entire rear surface 2a of the precast residual form panel body 2 is covered with the isolation coating film 4 and the sealing material 14, the concrete 12 is cast without contacting the rear surface 2a of the precast residual form panel body 2. Is done.
［セメント系固結材硬化工程］
コンクリート１２を打設した後、コンクリート１２を硬化させる。硬化の際、コンクリート１２は収縮する。
[Cement-based cement hardening process]
After placing the concrete 12, the concrete 12 is hardened. Upon hardening, the concrete 12 shrinks.
次に、本実施形態に係る施工方法、及びこの施工方法に使用するプレキャスト製残存型枠パネル１の作用効果について、説明する。 Next, the operation and effect of the construction method according to the present embodiment and the precast residual form panel 1 used in the construction method will be described.
従来の残存型枠の施工方法は、背面に多くのクレーターＵを有し、レイタンス層Ｌが存在するプレキャスト製残存型枠パネル１０１を使用していた。この残存型枠の施工方法では、図４に示すように、コンクリート１１２が硬化する際に、コンクリート１１２が収縮する変位が幅方向Ｘに加わり、コンクリート１１２にひび割れＣ２が発生する。
さらに、プレキャスト製残存型枠パネル１０１の背面にレイタンス層Ｌが存在すると、プレキャスト製残存型枠パネル１０１のひび割れは生じにくくなるが、プレキャスト製残存型枠パネル１０１の目地部やプレキャスト製残存型枠パネル１０１に形成された毛細管空隙１０２から、コンクリート１１２側から発生する汚水等が漏れ出す。そうすると、プレキャスト製残存型枠パネル１０１の表面が汚染される。
In the conventional method of applying the remaining formwork, a precast remaining formwork panel 101 having many craters U on the back surface and having the latence layer L is used. In this method of applying the remaining formwork, as shown in FIG. 4, when the concrete 112 hardens, a displacement for contracting the concrete 112 is applied in the width direction X, and a crack C2 occurs in the concrete 112.
Further, when the latence layer L is present on the back surface of the precast residual form panel 101, cracks of the precast residual form panel 101 are unlikely to occur, but joints of the precast residual form panel 101 and the precast residual form panel are formed. From the capillary space 102 formed in the panel 101, sewage or the like generated from the concrete 112 side leaks. Then, the surface of the precast residual form panel 101 is contaminated.
本実施形態に係る施工方法は、プレキャスト製残存型枠パネル本体２の背面２ａに隔離塗布膜４を設け、かつ、隣接するプレキャスト製残存型枠パネル１の隔離塗布膜４の端部同士をシーリング材１４でつなぎ合わせ、残存型枠１０の背面２ａ全域を、つなぎ合わされた隔離塗布膜４とシーリング材１４で覆う。
そうすると、図５に示すように、隔離塗布膜４によって毛細管空隙９の入り口９ａが完全に塞がれ、かつ隔離塗布膜４とシーリング材１４によって、残存型枠１０の背面２ａ全域とコンクリート１２とが完全に遮断される。
そのため、硬化したコンクリート１２側に侵入した雨水や融雪剤から溶出した塩水が、プレキャスト製残存型枠パネル本体２の毛細管空隙９（プレキャスト製残存型枠パネル本体２の内部）へ侵入することが抑制される。そうすると、プレキャスト製残存型枠パネル本体２に対して生じる凍害や塩害を抑止することができ、プレキャスト製残存型枠パネル本体２の劣化、破損、変形すること、及びプレキャスト製残存型枠パネル本体２の補強材である鉄筋５が腐食することを回避できる。
したがって、本実施形態に係る施工方法により施工した後、残存型枠１０の外観を保つと共に、長期間、耐久性能を低下させずに、安定して、残存型枠１０を維持できる。
In the construction method according to the present embodiment, the isolation coating film 4 is provided on the back surface 2a of the precast residual form panel main body 2, and the ends of the isolation coating film 4 of the adjacent precast residual form panel 1 are sealed. The entire back surface 2a of the remaining formwork 10 is covered with the joined isolation coating film 4 and the sealing material 14.
Then, as shown in FIG. 5, the entrance 9a of the capillary cavity 9 is completely closed by the isolation coating film 4, and the entire back surface 2a of the remaining form 10 and the concrete 12 are separated by the isolation coating film 4 and the sealing material 14. Is completely shut off.
For this reason, it is suppressed that the rainwater or the salt water eluted from the snow melting agent that has intruded into the hardened concrete 12 enters the capillary gap 9 (inside the precast residual form panel body 2) of the precast residual form panel body 2. Is done. Then, frost damage and salt damage to the precast residual form panel body 2 can be suppressed, and the precast residual form panel body 2 can be degraded, damaged and deformed, and the precast residual form panel body 2 can be suppressed. Corrosion of the reinforcing bar 5 as a reinforcing material can be avoided.
Therefore, after the construction by the construction method according to the present embodiment, the appearance of the remaining formwork 10 is maintained, and the remaining formwork 10 can be stably maintained for a long time without lowering the durability performance.
また、残存型枠１０の背面２ａ全域を、つなぎ合わされた隔離塗布膜４とシーリング材１４で覆われているため、プレキャスト製残存型枠パネル１の目地部８の隙間からの水漏れ及びプレキャスト製残存型枠パネル本体２に形成された毛細管空隙９を介して、水分がプレキャスト製残存型枠パネル１の表面に漏れ出すことを長期に亘り防止し、水漏れ防止の信頼性を飛躍的に向上させることができる。 Further, since the entire back surface 2a of the remaining formwork 10 is covered with the joined isolation coating film 4 and the sealing material 14, water leakage from the gap of the joint portion 8 of the precast remaining formwork panel 1 and the precast form Water is prevented from leaking to the surface of the precast residual form panel 1 through the capillary gap 9 formed in the residual form panel body 2 for a long time, and the reliability of water leakage prevention is dramatically improved. Can be done.
コンクリート１１２には、上述したとおり、収縮によって生じるひび割れ変位が、幅方向Ｘに生じる。
本実施形態に係る施工方法では、プレキャスト製残存型枠パネル本体２の背面２ａとコンクリート１２との間に、コンクリート１２の収縮により、隔離塗布膜４とコンクリート１２との間に、肌別れ隙間が形成される。この肌別れ隙間が形成されると、セメント系固結材硬化工程において、コンクリート１２の収縮により、幅方向にひび割れ変位が生じても、このひび割れ変位はプレキャスト製残存型枠パネル本体２にほとんど伝わらない。
したがって、残存型枠１０を施工した後に、プレキャスト製残存型枠パネル本体２にひび割れが生じることを抑止することができ、残存型枠１０の外観を維持することができる。
As described above, in the concrete 112, a crack displacement caused by shrinkage occurs in the width direction X.
In the construction method according to the present embodiment, between the back surface 2a of the precast remaining form panel main body 2 and the concrete 12, due to the contraction of the concrete 12, the separation gap between the isolation coating film 4 and the concrete 12 is formed. It is formed. When the skin separation gap is formed, even if crack displacement occurs in the width direction due to shrinkage of the concrete 12 in the cement-based hardening material hardening process, the crack displacement is almost transmitted to the precast residual form panel body 2. Absent.
Therefore, it is possible to suppress the occurrence of cracks in the precast residual form panel body 2 after the residual form 10 is applied, and to maintain the appearance of the residual form 10.
また、本実施形態で使用するプレキャスト製残存型枠パネル１には隔離塗布膜４が設けられ、プレキャスト製残存型枠パネル本体２の毛細管空隙９の入り口９ａが塞がれているため、セメント系固結材硬化工程において、毛細管空隙９からコンクリート１２の水分が放出されることが抑制される。そうすると、コンクリート１２は、徐々に固結し、ひび割れが生じにくくなる。そのため、残存型枠１０を施工した後、プレキャスト製残存型枠パネル本体２にひび割れが生じることが抑止される。
このように、コンクリート１２が徐々に固結することで、ひび割れが生じにくくなる効果は、夏場に残存型枠を施工する場合や、日当たりが良い位置に残存型枠１０を構築する場合に、有効である。
In addition, the precast residual form panel 1 used in the present embodiment is provided with the isolation coating film 4 and the entrance 9a of the capillary cavity 9 of the precast residual form panel body 2 is closed, so that cement-based In the hardening material hardening step, the release of moisture of the concrete 12 from the capillary gap 9 is suppressed. Then, the concrete 12 gradually solidifies, and cracks are less likely to occur. For this reason, after the remaining formwork 10 is constructed, the occurrence of cracks in the precast remaining formwork panel body 2 is suppressed.
As described above, the effect that the concrete 12 is gradually solidified and cracks are less likely to occur is effective when the remaining formwork is constructed in summer or when the remaining formwork 10 is constructed in a sunny place. It is.
以上説明した通り、本実施形態に係る施工方法を用いることによって、塩害や凍害によってプレキャスト製残存型枠パネルが劣化することを防止でき、プレキャスト製残存型枠にひび割れが生じることを抑止し、さらに、残存型枠の表面が汚染されることを防止できる。そのため、本実施形態に係る施工方法は、非常に有用性の高いものであると共に、汎用性の高いものである。 As described above, by using the construction method according to the present embodiment, it is possible to prevent the deterioration of the precast residual form panel due to salt damage and frost damage, and to suppress the occurrence of cracks in the precast residual form panel, In addition, the surface of the remaining form can be prevented from being contaminated. Therefore, the construction method according to the present embodiment is very useful and highly versatile.
以上、本実施形態について説明したが、これ以外にも、本発明の主旨を逸脱しない限り、上記実施の形態で挙げた構成を取捨選択したり、他の構成に適宜変更することが可能である。
例えば、背面２ａ全域に隔離塗布膜４を設けた場合が最も顕著な効果を生じさせるが、背面２ａ全域でなくても、所望の効果が生じれば、隔離塗布膜４を設ける領域は限定されない。
さらに、本実施形態では、被連結金具３がフック状のものを例に示したが、連結金具１１と連結させることができれば、フック状に限定されない。
The present embodiment has been described above. However, other than this, the configuration described in the above-described embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention. .
For example, the case where the isolation coating film 4 is provided over the entire area of the rear surface 2a produces the most remarkable effect, but the area where the isolation coating film 4 is provided is not limited as long as the desired effect is obtained even if it is not the entire area of the rear surface 2a. .
Further, in the present embodiment, the connected metal fittings 3 have been described as being hook-shaped, but are not limited to hook-shaped as long as they can be connected to the connecting metal fittings 11.
本実施形態では、プレキャスト製残存型枠パネル２の背面２ａに設けられる隔離塗布膜は、背面２ａに形成される毛細管空隙９の入り口９ａを防ぐことができるものであればよい。また、本実施形態の残存型枠の施工方法は、例えば、鋼矢板の前面に構築したり、残存型枠１０同士を互いに向き合わせたりして、構築できる。 In this embodiment, the isolation coating film provided on the back surface 2a of the precast residual form panel 2 may be any as long as it can prevent the entrance 9a of the capillary space 9 formed on the back surface 2a. Moreover, the construction method of the remaining formwork of the present embodiment can be constructed by, for example, constructing the front form of a steel sheet pile or facing the remaining formworks 10 to each other.
１ プレキャスト製残存型枠パネル（パネル）
２ プレキャスト製残存型枠パネル本体（パネル本体）
２ａ 背面（裏面）
３ 被連結金具
４，４ａ 隔離塗布膜
５ 鉄筋
６ フック部
７ 埋設部
８ 目地部
９ 毛細管空隙
９ａ 入り口（毛細管空隙の入り口）
１０ 残存型枠
１１ 連結金具（セパレータ）
１２ コンクリート（セメント系固結材）
１３ 木製型枠（コンパネ）
１４ シーリング材
１０１ プレキャスト製残存型枠パネル
１０２ 毛細管空隙
１０３ 被連結金具
１０４ 鋼矢板
１１０ 残存型枠
１１１ 連結金具（セパレータ）
１１２ コンクリート
Ｃ１，Ｃ２ ひび割れ
Ｌ レイタンス層
Ｕ クレーター
Ｘ 幅方向
Ｙ 高さ方向
Ｚ 前後方向
1 Precast residual formwork panel (panel)
2 Precast residual formwork panel body (panel body)
2a Back (back)
3 Connected metal fittings 4, 4a Isolation coating film 5 Reinforcing bar 6 Hook portion 7 Embedded portion 8 Joint portion 9 Capillary space 9a Entrance (entrance of capillary space)
10 Remaining formwork 11 Connecting bracket (separator)
12. Concrete (cement-based cement)
13 wooden formwork (control panel)
14 Sealing material 101 Precast remaining form panel 102 Capillary void 103 Connected fitting 104 Steel sheet pile 110 Remaining form 111 Connecting fitting (separator)
112 Concrete C1, C2 Crack L Laitance layer U Crater X Width direction Y Height direction Z Front-back direction
Claims (2)
前記残存型枠を構築した後に、前記プレキャスト製残存型枠パネルの背面に、コンクリート等のセメント系固結材を打設するセメント系固結材打設工程と、
前記セメント系固結材を打設した後に、前記セメント系固結材を硬化させるセメント系固結材硬化工程と、を含み、
前記隔離塗布膜を形成することで、前記プレキャスト製残存型枠パネル本体の背面と前記セメント系固結材とが固着されないと共に、前記隔離塗布膜と前記セメント系固結材との間に、肌別れ隙間が形成され、
前記セメント系固結材硬化工程において、前記セメント系固結材の収縮によって生じるひび割れ変位が、前記プレキャスト製残存型枠パネル本体にほとんど伝わらず、施工した後に、前記プレキャスト製残存型枠パネル本体にひび割れが生じることが抑止され、かつ、硬化した前記セメント系固結材側に侵入した雨水や融雪剤から溶出した塩水が、前記プレキャスト製残存型枠パネル本体の前記毛細管空隙へ浸水することを防止することにより、前記プレキャスト製残存型枠パネルの凍害や塩害を抑止する、
ことを特徴とする残存型枠の施工方法。 By applying a paint having a waterproof function to the back of the precast residual form panel body having a capillary void therein, an isolation coating film covering the entrance of the capillary void is formed on the back of the precast residual form panel main body. Using the provided precast residual form panel, a residual form constructing step of constructing the residual form,
After constructing the residual formwork, on the back of the precast residual formwork panel, cement-based cementing material casting step of casting cement-based cementing material such as concrete,
After placing the cement-based binder, cement-based binder curing step of curing the cement-based binder, and
By forming the isolation coating film, the back surface of the precast residual form panel main body and the cement-based binder are not fixed, and a skin is formed between the isolation coating film and the cement-based binder. A separation gap is formed,
In the cement-based cement hardening step, the crack displacement caused by shrinkage of the cement-based cement hardly transmits to the precast residual form panel body, and after construction, the precast residual form panel body is The occurrence of cracks is suppressed, and the rainwater or salt water eluted from the snow-melting agent that has infiltrated into the hardened cementitious cementing material is prevented from infiltrating into the capillary gap of the precast residual form panel body. By doing so, to prevent frost damage and salt damage of the precast residual form panel,
A method for constructing a residual formwork, characterized in that:
つなぎ合わされた隔離塗布膜によって、前記プレキャスト製残存型枠パネルの背面全域と前記セメント系固結材とが隔離されることで、打設された前記セメント系固結材から生じる汚染物を含有した汚染水、硬化した前記セメント系固結材側に侵入した水や融雪剤から溶出した塩水が、前記プレキャスト製残存型枠パネル側に流れ込むことを防止することにより、前記プレキャスト製残存型枠パネル本体の前記毛細管空隙や目地部の隙間への浸水を防止することにより、前記プレキャスト製残存型枠パネルの表面の汚染、及び凍害や塩害を抑止する、
ことを特徴とする請求項１に記載の残存型枠の施工方法。 By joining the ends of the isolation coating films of the adjacent precast residual form panels with a sealing material, the entire back surface of the precast residual form panels is covered with the isolation coating film and the sealing material. ,
The cemented binder was separated from the entire back surface of the precast residual form panel by the joined separated coating films, thereby containing contaminants generated from the cemented binder that had been cast. The precast residual form panel body is prevented by preventing contaminated water, hardened water from entering the cement-based consolidated material side and salt water eluted from the snow melting agent from flowing into the precast residual form panel side. By preventing infiltration into the gaps between the capillary voids and joints, contamination of the surface of the precast residual form panel, and suppression of frost damage and salt damage,
The method according to claim 1, wherein the remaining formwork is installed.
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