JP6474096B2 - Repair structure of concrete structure and its construction method - Google Patents

Repair structure of concrete structure and its construction method Download PDF

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JP6474096B2
JP6474096B2 JP2015005444A JP2015005444A JP6474096B2 JP 6474096 B2 JP6474096 B2 JP 6474096B2 JP 2015005444 A JP2015005444 A JP 2015005444A JP 2015005444 A JP2015005444 A JP 2015005444A JP 6474096 B2 JP6474096 B2 JP 6474096B2
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crack
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太司 松島
太司 松島
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株式会社ケー・エフ・シー
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本発明は、例えばトンネル、地下施設、建築物等のコンクリート構造物で発生する漏水を止水して補修するコンクリート構造物の補修構造及びその施工方法に関する。   The present invention relates to a repair structure for a concrete structure that repairs water leakage that occurs in a concrete structure such as a tunnel, an underground facility, or a building, and a method for constructing the repair structure.

コンクリート構造物の漏水を止水する補修工法として、図6に示すように、コンクリート壁20に生じたひび割れ21に対し、ひび割れ21を横断するように所定角度で且つ壁厚の約2/3程度の深い位置まで注入孔22を形成すると共に、ひび割れ21のコンクリート壁20の表層部位を急結セメント23で閉塞し、この状態で700〜1400mPa・sの高粘度の止水材を注入孔22とひび割れ21に10〜20MPaの高圧で注入し、水との化学反応で発泡させて注入孔22とひび割れ21に充填するように止水部24を形成するものがある(特許文献1参照)。尚、図中、31は土壌、32はコンクリート壁20と土壌31との間の水が存在している背面空洞である。   As a repair method for stopping the leakage of water in a concrete structure, as shown in FIG. 6, the crack 21 generated on the concrete wall 20 is at a predetermined angle so as to cross the crack 21 and about 2/3 of the wall thickness. The injection hole 22 is formed up to a deep position, and the surface layer portion of the concrete wall 20 of the crack 21 is closed with the quick-setting cement 23. In this state, a high-viscosity waterstop material of 700 to 1400 mPa · s is formed as the injection hole 22. There is one in which a water stop portion 24 is formed so as to be injected into the crack 21 at a high pressure of 10 to 20 MPa and foamed by a chemical reaction with water to fill the injection hole 22 and the crack 21 (see Patent Document 1). In the figure, 31 is soil, and 32 is a back cavity where water between the concrete wall 20 and the soil 31 exists.

また、図7に示すように、コンクリート壁20に背面まで貫通する貫通孔25を形成し、貫通孔25に水に近い比重の止水材を注入してコンクリート壁20の背面に沿って放射状に広範囲に拡散させ、コンクリート壁20の背面側に硬化した止水膜26を形成する工法もある(特許文献2参照)。この止水膜26は、漏水しているひび割れ21が多数存在する箇所や、漏水経路が特定できない箇所でも止水することを意図している。   Further, as shown in FIG. 7, a through hole 25 penetrating to the back surface is formed in the concrete wall 20, and a water-stopping material having a specific gravity close to water is injected into the through hole 25 to radiate along the back surface of the concrete wall 20. There is also a method of forming a water-stopping film 26 that is diffused over a wide area and hardened on the back side of the concrete wall 20 (see Patent Document 2). The water blocking film 26 is intended to stop water even at locations where there are many leaking cracks 21 or where the water leakage path cannot be specified.

特開2004−251010号公報JP 2004-251010 A 特開2014−208970号公報JP 2014-208970 A

ところで、図6のひび割れ21を横断するように所定角度で注入孔22を形成して止水材をひび割れ21に充填する工法では、ひび割れ21を横断しないように注入孔22を形成してしまう場合も多々生じ、この場合には、ひび割れ21に止水材が充填されず止水されないことになる。この横断の成否は、止水材の注入圧の圧力管理においても、正常な注入完了でも注入孔がひび割れに当たってない場合の注入完了でも同じように圧が上昇してしまうため、判別することは困難である。更に、高圧注入を行うためには、高価な高圧ポンプを準備する必要があると共に、高圧注入を行うと予期しない箇所から止水材が噴出する可能性も高まり、施工管理に手間を要するという問題もある。   By the way, in the construction method in which the injection hole 22 is formed at a predetermined angle so as to cross the crack 21 in FIG. 6 and the water-stopping material is filled into the crack 21, the injection hole 22 is formed so as not to cross the crack 21. In this case, the cracks 21 are not filled with the water-stopping material and are not stopped. The success or failure of this crossing is difficult to discriminate in the pressure control of the injection pressure of the water-stopping material, because the pressure rises in the same way even when the normal injection is completed or when the injection hole is not cracked. It is. Furthermore, in order to perform high-pressure injection, it is necessary to prepare an expensive high-pressure pump, and if high-pressure injection is performed, there is a possibility that a water-stopping material will be ejected from an unexpected location, which requires troublesome construction management. There is also.

他方において、図7のコンクリート壁20の背面側に止水膜26を形成する工法では、上述の注入孔22のひび割れ21に対する横断で止水性が阻害されることはないが、背面空洞が大きい場合には止水材が貫通孔25の出口周りに留まらず流出して無くなってしまい、止水膜26を形成することができないという別の問題を生ずる。更に、コンクリート壁20の壁厚が大きい場合には、貫通孔25の穿孔作業に多大な労力が必要になるという不具合もある。   On the other hand, in the construction method in which the water blocking film 26 is formed on the back side of the concrete wall 20 in FIG. 7, the water blocking is not hindered by crossing the crack 21 of the injection hole 22 described above, but the back cavity is large. In this case, the water-stopping material does not stay around the outlet of the through-hole 25 and flows out and disappears, resulting in another problem that the water-stopping film 26 cannot be formed. Furthermore, when the wall thickness of the concrete wall 20 is large, there is a problem that a great deal of labor is required for the drilling operation of the through hole 25.

本発明は上記課題に鑑み提案するものであって、注入孔がひび割れを横断しない場合やコンクリートの背面に大きな空洞がある場合でも確実に止水することができると共に、施工コストが低く、施工効率に優れるコンクリート構造物の補修構造及びその施工方法を提供することを目的とする。   The present invention is proposed in view of the above problems, and can reliably stop water even when the injection hole does not cross the crack or there is a large cavity on the back of the concrete, and the construction cost is low and the construction efficiency is low. An object of the present invention is to provide a concrete structure repair structure and its construction method that are superior to the above.

本発明のコンクリート構造物の補修構造は、コンクリートの止水対象領域に前記コンクリートの表面側から非貫通で形成され、前記止水対象領域に間隔を開けて複数設けられる注入孔と、前記注入孔の各々に略充填するように設けられ、且つ前記注入孔の各々を起点として拡散し前記コンクリートの微小空隙に浸透するように設けられる止水部とを備え、前記止水部が、粘度1〜5mPa・sで比重1.075±0.025のアクリル酸ナトリウムを主成分とする第1主剤と、粘度1〜5mPa・sで比重1.025±0.025の過硫酸ナトリウムを主成分とする第2主剤と、硬化時間を調整する硬化調整剤から構成される止水材によって形成されていることを特徴とする。
これによれば、止水材はコンクリートの止水対象領域全体に浸透して、微小空隙に浸透した止水部を含めて止水対象領域全体が止水される為、注入孔がひび割れを横断していない場合にも浸透した止水材がひび割れに到達して略充填することになるから、注入孔がひび割れを横断しない場合にも確実に止水することができる。更に、コンクリート自体に浸透して止水部が構成されるから、コンクリートの背面の空洞の大小に拘わらず確実に止水することができる。また、粘度1〜5mPa・s以下の主剤から構成される止水材を加圧注入する際には、安価な低圧ポンプの圧力で加圧注入すれば止水材を極微細な微小間隙まで拡散、浸透させることができ、高圧性能を有する高価な高圧ポンプが不要で、低コストで施工することができる。更に、注入孔を深く穿孔せずとも、低圧の加圧注入で止水材を十分に拡散、浸透させることができることから、穿孔作業の労力を低減し、施工効率を高めることができる。更に、低圧の加圧注入では予期しない箇所から止水材が噴出することがなく、施工管理に要する労力も低減できると共に、補修するコンクリートに加圧で負荷される負担も少なくて済む。また、硬化した止水部を弾力性、密着性、接着力に富むもの、水や有機物による溶脱がないものとすることができ、コンクリートの背面が地盤の場合には地盤の安定化を期することも可能となる。また、止水材の比重が水に近いため、現に水漏れが生じている場合でも、水に浮いたり沈んだりすることなく、きちんと止水材を行き渡らせることができる。また、硬化調整剤の添加量を調整することにより、ゲルタイムを現場状況に応じてその場で調整することも可能となる。
The repair structure for a concrete structure of the present invention is formed in a concrete water-stop target region in a non-penetrating manner from the surface side of the concrete, and a plurality of injection holes provided at intervals in the water-stop target region, and the injection hole A water stop portion provided so as to substantially fill each of the injection holes and diffused starting from each of the injection holes and penetrating into the micro voids of the concrete, and the water stop portion has a viscosity of 1 to 1st main ingredient mainly composed of sodium acrylate having a specific gravity of 1.075 ± 0.025 at 5 mPa · s, and sodium persulfate having a specific gravity of 1.025 ± 0.025 at a viscosity of 1 to 5 mPa · s as a main component. It is formed by the water stop material comprised from the 2nd main ingredient and the hardening regulator which adjusts hardening time, It is characterized by the above-mentioned.
According to this, the water stop material penetrates the entire water stop target area of the concrete, and the entire water stop target area including the water stop portion that has penetrated into the minute gaps is stopped, so the injection hole crosses the crack. Even if not, since the penetrated water-stopping material reaches the crack and is almost filled, the water can be reliably stopped even when the injection hole does not cross the crack. Further, since the water stop portion is formed by penetrating into the concrete itself, the water can be reliably stopped regardless of the size of the cavity on the back surface of the concrete. In addition, when pressure-stopping a water-stopping material composed of a main agent having a viscosity of 1 to 5 mPa · s or less, the water-stopping material can be diffused to an extremely fine gap by pressurizing and injecting with the pressure of an inexpensive low-pressure pump. Therefore, an expensive high-pressure pump having high-pressure performance can be used, and construction can be performed at low cost. Furthermore, since the water-stopping material can be sufficiently diffused and permeated by low-pressure pressurization without deeply drilling the injection hole, the labor of the drilling operation can be reduced and the construction efficiency can be increased. Furthermore, the water-stopping material is not ejected from an unexpected location by low-pressure pressurization, so that the labor required for construction management can be reduced and the load imposed on the concrete to be repaired by pressurization can be reduced. In addition, the hardened water-stopping part can be made of a material with high elasticity, adhesion, and adhesive strength, and cannot be leached by water or organic matter. If the back of the concrete is the ground, the ground will be stabilized. It is also possible. In addition, since the specific gravity of the water-stopping material is close to that of water, the water-stopping material can be properly distributed without floating or sinking in the water even when water leakage actually occurs. Further, by adjusting the addition amount of the curing modifier, it is possible to adjust the gel time on the spot according to the on-site situation.

本発明のコンクリート構造物の補修構造の施工方法は、本発明のコンクリート構造物の補修構造を施工する方法であって、前記注入孔を形成して、前記注入孔を形成して、前記注入孔の孔奥と孔外の連通を閉塞可能なパッカーを前記注入孔の口元に設置する第1工程と、粘度1〜5mPa・sで比重1.075±0.025のアクリル酸ナトリウムを主成分とする第1主剤と、粘度1〜5mPa・sで比重1.025±0.025の過硫酸ナトリウムを主成分とする第2主剤と、硬化時間を調整する硬化調整剤を混合しつつ、前記止水材として、前記注入孔の口元の連通部分から前記注入孔内に200kPa以下の圧力で注入する第2工程と、前記コンクリートの表面からの前記止水材の滲み出しを確認する第3工程とを備えることを特徴とする。
これによれば、止水材を硬化して設ける止水部を弾力性、密着性、接着力に富むもの、水や有機物による溶脱がないものとすることができ、コンクリートの背面が地盤の場合には地盤の安定化を期することも可能となる。また、止水材の比重が水に近いため、現に水漏れが生じている場合でも、水に浮いたり沈んだりすることなく、きちんと止水材を行き渡らせることができる。また、硬化調整剤の添加量を調整することにより、ゲルタイムを現場状況に応じてその場で調整することも可能となる。また、200kPa以下の加圧注入により、止水材の十分な拡散、浸透を図りつつ、加圧注入で補修するコンクリートにかかる負担を最小限に留めることができる。また、コンクリートの表面からの止水材の滲み出しで注入完了を効率的に認識することができ、より一層施工効率を向上することができる。
The concrete structure repair method according to the present invention is a method for constructing a concrete structure repair structure according to the present invention, wherein the injection hole is formed, the injection hole is formed, and the injection hole is formed. A first step of installing a packer at the mouth of the injection hole that can block the communication between the back of the hole and the outside of the hole, and a sodium acrylate having a viscosity of 1 to 5 mPa · s and a specific gravity of 1.075 ± 0.025 as a main component Mixing the first main agent, a second main agent containing sodium persulfate having a viscosity of 1 to 5 mPa · s and a specific gravity of 1.025 ± 0.025 as a main component, and a curing regulator for adjusting the curing time. As a water material, a second step of injecting into the injection hole from the communicating portion at the mouth of the injection hole at a pressure of 200 kPa or less, and a third step of confirming the seepage of the water stop material from the surface of the concrete, It is characterized by having The
According to this, the water-stop part provided by curing the water-stop material can be made of a material with high elasticity, adhesion, adhesion, and no leaching due to water or organic matter. It is possible to stabilize the ground. In addition, since the specific gravity of the water-stopping material is close to that of water, the water-stopping material can be properly distributed without floating or sinking in the water even when water leakage actually occurs. Further, by adjusting the addition amount of the curing modifier, it is possible to adjust the gel time on the spot according to the on-site situation. In addition, by applying pressure injection of 200 kPa or less, it is possible to minimize the burden on the concrete to be repaired by pressure injection while ensuring sufficient diffusion and penetration of the water-stopping material. Moreover, the completion of the injection can be recognized efficiently by the seepage of the water-stopping material from the concrete surface, and the construction efficiency can be further improved.

本発明のコンクリート構造物の補修構造或いはその施工方法によれば、注入孔がひび割れを横断しない場合やコンクリートの背面に大きな空洞がある場合でも確実に止水することができると共に、低い施工コスト、優れた施工効率での施工を行うことができる。   According to the repair structure of a concrete structure of the present invention or the construction method thereof, water can be reliably stopped even when the injection hole does not cross the crack or there is a large cavity on the back of the concrete, and the construction cost is low. Construction can be performed with excellent construction efficiency.

本発明による実施形態のコンクリート構造物の補修構造の施工途中状態を示す一部断面説明図。Partial cross-sectional explanatory drawing which shows the construction middle state of the repair structure of the concrete structure of embodiment by this invention. 本発明による実施形態のコンクリート構造物の補修構造を示す縦断面図。The longitudinal cross-sectional view which shows the repair structure of the concrete structure of embodiment by this invention. 漏水しているコンクリートの止水対象領域を示す縦断面図。The longitudinal cross-sectional view which shows the water stop target area | region of the concrete which is leaking water. 図3のコンクリートの止水対象領域に注入孔を穿孔してシールを施した状態を示す縦断面図。The longitudinal cross-sectional view which shows the state which perforated the injection hole in the water stop object area | region of the concrete of FIG. 3, and gave the seal | sticker. 図4の状態から注入孔にパッカーを設置して止水材を注入した状態を示す縦断面図。The longitudinal cross-sectional view which shows the state which installed the packer in the injection hole from the state of FIG. 4, and inject | poured the water stop material. 従来例の補修構造を示す部分縦断面図。The fragmentary longitudinal cross-section which shows the repair structure of a prior art example. 従来の別例の補修構造を示す部分縦断面図。The fragmentary longitudinal cross-section which shows the conventional repair structure of another example.

〔実施形態のコンクリート構造物の補修構造及びその施工方法〕
本発明による実施形態のコンクリート構造物の補修構造は、図1に示すように、トンネル1の覆工コンクリート2を補修するものである。覆工コンクリート2の外側の土壌3と覆工コンクリート2との間の背面空洞4には水が存在しており、覆工コンクリート2に生じたひび割れ5からの漏水を止水するように補修構造が設けられる。
[Repair structure of concrete structure of embodiment and construction method thereof]
The concrete structure repair structure according to the embodiment of the present invention repairs the lining concrete 2 of the tunnel 1 as shown in FIG. Water is present in the back cavity 4 between the soil 3 outside the lining concrete 2 and the lining concrete 2, and the repair structure is configured to stop water leakage from the crack 5 generated in the lining concrete 2. Is provided.

本実施形態の補修構造では、図1及び図2に示すように、覆工コンクリート2の止水対象領域に、覆工コンクリート2の表面側から注入孔6が非貫通で形成されている。非貫通の注入孔6は、止水対象領域に間隔を開けて複数設けられており、各々の注入孔6の先端位置が、覆工コンクリート2の表面側から覆工コンクリート2の厚さ方向の1/2以下の位置となるように形成されており、好ましくは止水材のより広範囲な拡散浸透の観点から厚さ方向の1/2以下1/3以上の位置となるように形成される。   In the repair structure of this embodiment, as shown in FIG.1 and FIG.2, the injection hole 6 is formed in the water stop target area | region of the lining concrete 2 from the surface side of the lining concrete 2 without penetrating. A plurality of non-penetrating injection holes 6 are provided at intervals in the water stop target region, and the tip positions of the respective injection holes 6 extend from the surface side of the lining concrete 2 in the thickness direction of the lining concrete 2. It is formed so as to be a position of 1/2 or less, and preferably is formed to be a position of 1/2 or less in the thickness direction and 1/3 or more from the viewpoint of wider diffusion and penetration of the water-stopping material. .

各注入孔6の口元にはパッカー7が設置されており、注入孔6のパッカー7よりも孔奥の部分に止水部8a、注入孔6のパッカー7よりも手前の部分に止水部8bが注入孔6を略充填するようにして設けられている。更に、注入孔6がひび割れ5に横断している箇所ではひび割れ5に充填されるようにして止水部9aが設けられ、覆工コンクリート2の背面側におけるひび割れ5の開口を覆うように止水部9bが設けられている。更に、注入孔6の各々を起点として拡散し、止水対象領域の覆工コンクリート2の微小空隙に浸透するようにして止水部10が設けられている。   A packer 7 is installed at the mouth of each injection hole 6, a water stop portion 8 a at a deeper portion than the packer 7 of the injection hole 6, and a water stop portion 8 b at a portion before the packer 7 of the injection hole 6. Is provided so as to substantially fill the injection hole 6. Further, a water stop portion 9 a is provided so that the crack 5 is filled in the portion where the injection hole 6 crosses the crack 5, and the water stop is provided so as to cover the opening of the crack 5 on the back side of the lining concrete 2. A portion 9b is provided. Further, a water stop portion 10 is provided so as to diffuse from each of the injection holes 6 and penetrate into the minute gaps of the lining concrete 2 in the water stop target region.

止水部8a、8bと、止水部9a、9bと、止水部10は、粘度5mPa・s以下の主剤から構成される低粘度、高浸透性の止水材によって形成され、止水材は、例えば粘度1〜5mPa・sで比重1.075±0.025のアクリル酸ナトリウムを主成分とする第1主剤と、粘度1〜5mPa・sで比重1.025±0.025の過硫酸ナトリウムを主成分とする第2主剤と、硬化時間を調整する硬化調整剤から構成することが好ましい。   The water stop portions 8a and 8b, the water stop portions 9a and 9b, and the water stop portion 10 are formed of a low-viscosity, high-permeability water stop material composed of a main agent having a viscosity of 5 mPa · s or less. Are, for example, a first main ingredient mainly composed of sodium acrylate having a viscosity of 1 to 5 mPa · s and a specific gravity of 1.075 ± 0.025, and persulfuric acid having a viscosity of 1 to 5 mPa · s and a specific gravity of 1.025 ± 0.025. It is preferable to comprise from the 2nd main ingredient which has sodium as a main component, and the hardening regulator which adjusts hardening time.

止水部8a、8b、9a、9b、10は、覆工コンクリート2の止水対象領域の略全体に亘って設けられ、図1の例では、注入孔6を起点に拡散して周囲の微小空隙に浸透するように設けられている止水部10が、近隣の止水部10と一部重なるようにして形成されている。   The water stop portions 8a, 8b, 9a, 9b, and 10 are provided over substantially the entire water stop target region of the lining concrete 2, and in the example of FIG. The water stop portion 10 provided so as to penetrate into the gap is formed so as to partially overlap the adjacent water stop portion 10.

本実施形態のコンクリート構造物の補修構造を施工する際には、図3及び図4に示すように、ひび割れ5から漏水LWが発生している覆工コンクリート2の止水対象領域に穿孔を施して注入孔6を形成する。図4の例では、覆工コンクリート2の表面の施工面から覆工コンクリート2の内部に向かって下側に傾斜するようにして注入孔6を形成し、且つ先端位置が覆工コンクリート2の厚さ方向の1/2以下の位置となるようにして注入孔6を形成しており、ひび割れ5を横断する注入孔6と、ひび割れ5の無い箇所に設けられる注入孔6を形成している。この際、止水対象領域のひび割れ5、或いは注入孔6の横断で止水材が直接注入されるひび割れ5等の所要のひび割れ5については、覆工コンクリート2の表面側の開口を覆うようにしてシール材15を塗布或いは貼着等で設ける。   When constructing the repair structure for a concrete structure of this embodiment, as shown in FIGS. 3 and 4, drilling is performed in the water stop target area of the lining concrete 2 where the water leakage LW is generated from the crack 5. Thus, the injection hole 6 is formed. In the example of FIG. 4, the injection hole 6 is formed so as to incline downward from the construction surface of the surface of the lining concrete 2 toward the inside of the lining concrete 2, and the tip position is the thickness of the lining concrete 2. The injection hole 6 is formed so as to be at a position of ½ or less in the vertical direction, and the injection hole 6 that traverses the crack 5 and the injection hole 6 that is provided at a place where there is no crack 5 are formed. At this time, for the required crack 5 such as the crack 5 in the water stop target region or the crack 5 in which the water stop material is directly injected across the injection hole 6, the opening on the surface side of the lining concrete 2 is covered. The sealing material 15 is provided by coating or sticking.

そして、図5に示すように、注入孔6の口元に、注入孔6の孔奥と孔外の連通を閉塞可能なパッカー7を設置する。このパッカー7は、例えば注入孔6への設置後に袋内に膨張材を充填して膨張するもの、膨張ゴムを締め付けて膨張させるものなど適宜である。   Then, as shown in FIG. 5, a packer 7 is installed at the mouth of the injection hole 6, which can block communication between the depth of the injection hole 6 and the outside of the hole. The packer 7 is appropriate, for example, one that fills the bag with an inflating material after the installation into the injection hole 6 and expands, or one that tightens and expands the expansion rubber.

その後、パッカー7を設置した注入孔6内に、孔奥と孔外との連通部分を介して、止水材を200kPa以下の圧力で注入する。この止水材として、例えば上述の粘度1〜5mPa・sで比重1.075±0.025のアクリル酸ナトリウムを主成分とする第1主剤と、粘度1〜5mPa・sで比重1.025±0.025の過硫酸ナトリウムを主成分とする第2主剤と、硬化調整剤から構成される止水材を注入する場合には、図1に示すように、第1主剤と第2主剤を低圧ポンプ16で別々に供給し、注入孔6の近傍でミキシングユニット17により硬化調整剤を添加して混合しつつ、注入孔6内に低圧注入する。そして、注入孔6内への止水材の注入は、覆工コンクリート2の表面からの止水材の滲み出しを確認できた段階で完了とする。   Then, a water stop material is inject | poured in the injection hole 6 which installed the packer 7 with the pressure of 200 kPa or less through the communicating part of the hole back and the hole exterior. As the water-stopping material, for example, a first main agent mainly composed of sodium acrylate having a viscosity of 1 to 5 mPa · s and a specific gravity of 1.075 ± 0.025, and a specific gravity of 1.025 ± at a viscosity of 1 to 5 mPa · s. In the case of injecting a water-stopping material composed of 0.025 sodium persulfate as a main component and a curing regulator, as shown in FIG. 1, the first main agent and the second main agent are reduced in pressure. Separately supplied by the pump 16, low pressure injection is performed in the injection hole 6 while adding and mixing a curing regulator in the vicinity of the injection hole 6 by the mixing unit 17. Then, the injection of the water-stopping material into the injection hole 6 is completed when the seepage of the water-stopping material from the surface of the lining concrete 2 has been confirmed.

この際、本実施例の止水材はアクリル樹脂硬化体である為、基本的には無色透明であり、滲み出しにより覆工コンクリート2の表面を汚したくない場合にはこのまま用い、より明確に施工完了を確認したい場合には任意の着色料を混ぜておくことができ、現場条件に応じた色遣いが可能である。   At this time, since the water-stopping material of this example is a cured acrylic resin, it is basically colorless and transparent. If the surface of the lining concrete 2 is not to be soiled by oozing, it is used as it is. When it is desired to confirm the completion of the construction, any colorant can be mixed, and coloring according to the site conditions is possible.

この注入孔6内への止水材の注入により、ひび割れ5を横断していない注入孔6においては、注入孔6に充填された止水材が所定時間経過後に硬化して止水部8aが形成されると共に、注入孔6を起点にして注入された止水材が周囲の微小空隙に拡散、浸透することによって止水部10が形成され、更に、注入孔6のパッカー7の手前まで浸透、到達して止水部8bが形成される。   With the injection of the water-stopping material into the injection hole 6, the water-stopping material filled in the injection hole 6 is cured after a predetermined time and the water-stopping portion 8a is formed in the injection hole 6 that does not cross the crack 5. In addition to the formation, the water stop material injected from the injection hole 6 as a starting point diffuses and penetrates into the surrounding minute gaps to form the water stop portion 10, and further penetrates to the front of the packer 7 in the injection hole 6. The water stop 8b is formed.

また、ひび割れ5を横断している注入孔6においては、注入孔6に注入された止水材はひび割れ5の覆工コンクリート2の裏面側の開口から外側に一部が流れて、その開口を覆うようにして止水部9bが形成され、止水部9bとシール材15との間ではひび割れ5を充填するようにして止水部9aが形成され、更に、注入孔6に止水材が充填されて止水部8aが形成されると共に、注入孔6を起点にして注入された止水材が周囲の微小空隙に拡散、浸透することによって止水部10が形成され、更に、注入孔6のパッカー7の手前まで浸透、到達して止水部8bが形成される。   In addition, in the injection hole 6 crossing the crack 5, a part of the water-stopping material injected into the injection hole 6 flows outward from the opening on the back side of the lining concrete 2 of the crack 5, and the opening is opened. A water stop portion 9b is formed so as to cover, and a water stop portion 9a is formed so as to fill the crack 5 between the water stop portion 9b and the sealing material 15, and further, a water stop material is formed in the injection hole 6. The water-stopping portion 8a is formed by filling, and the water-stopping material injected from the injection hole 6 as a starting point diffuses and penetrates into the surrounding minute gaps to form the water-stopping portion 10, and further, the injection hole The water stop portion 8b is formed by penetrating and reaching the front of the packer 7 of 6.

本実施形態によれば、止水部10が覆工コンクリート2の止水対象領域全体に浸透して、微小空隙に浸透した止水部を含めて止水対象領域全体が止水される為、注入孔6がひび割れ5を横断していない場合にも浸透した止水材がひび割れ5に到達して略充填することになるから、注入孔6がひび割れ5を横断せずとも確実に止水することができる。更に、覆工コンクリート2自体に浸透して止水部が構成されるから、覆工コンクリート2の背面空洞4の大小に拘わらず確実に止水することができる。   According to the present embodiment, the water stop portion 10 penetrates the entire water stop target region of the lining concrete 2, and the entire water stop target region including the water stop portion that has permeated the minute gaps is stopped. Even when the injection hole 6 does not cross the crack 5, the permeated water-stopping material reaches the crack 5 and is substantially filled, so that the injection hole 6 reliably stops water without crossing the crack 5. be able to. Furthermore, since the water stop portion is formed by penetrating into the lining concrete 2 itself, the water can be reliably stopped regardless of the size of the back cavity 4 of the lining concrete 2.

また、粘度1〜5mPa・s以下の主剤から構成される止水材を加圧注入する際には、安価な低圧ポンプ16の圧力で加圧注入すれば止水材を極微細な微小間隙まで拡散、浸透させることができ、高圧性能を有する高価な高圧ポンプが不要で、低コストで施工することができる。更に、注入孔6を深く穿孔せずとも、低圧の加圧注入で止水材を十分に拡散、浸透させることができることから、穿孔作業の労力を低減し、施工効率を高めることができる。更に、低圧の加圧注入では予期しない箇所から止水材が噴出することがなく、施工管理に要する労力も低減できると共に、補修する覆工コンクリート2に加圧で負荷される負担も少なくて済む。 In addition, when pressure-injecting a water-stopping material composed of a main agent having a viscosity of 1 to 5 mPa · s or less, if the water-stopping material is pressurized and injected with the pressure of an inexpensive low-pressure pump 16, the water-stopping material can reach a very fine gap. It can be diffused and infiltrated, and an expensive high-pressure pump having high-pressure performance is unnecessary, and construction can be performed at low cost. Furthermore, since the water-stopping material can be sufficiently diffused and permeated by low-pressure pressurization without deeply drilling the injection hole 6, it is possible to reduce the labor of the drilling operation and increase the construction efficiency. Furthermore, the water-stopping material is not ejected from an unexpected part by low-pressure pressurization, so that the labor required for construction management can be reduced and the burden imposed on the lining concrete 2 to be repaired by pressurization can be reduced. .

また、覆工コンクリート2の止水対象領域の略全体に亘って止水部が設けられることにより、近い将来ひび割れ5が生ずる可能性が高い箇所も含め、漏れなく止水処理を行うことができ、現に漏水しているひび割れ5を塞いだら別のひび割れ5に水が回って漏水し、そこに止水処理を別途行うような堂々巡りも無くすことができる。特に、本実施形態では止水部がアクリル樹脂硬化体により形成されるので、アクリル樹脂が吸水によって膨潤し、乾燥収縮しても弾性状態を維持し、再度水を含めば膨潤するのを繰り返すという性質を活かしてして止水している為、硬化後の止水材の収縮による隙間の再形成の懸念もなく、安定的且つ長期に亘っての止水効果が期待できる。   In addition, since the water stop portion is provided over substantially the entire water stop target area of the lining concrete 2, it is possible to perform the water stop treatment without leakage including a portion where a crack 5 is likely to occur in the near future. When the crack 5 which has actually leaked water is closed, water can turn to another crack 5 and leak, and there is no need to perform a water stop treatment separately. In particular, in this embodiment, the water-stop portion is formed of a cured acrylic resin, so that the acrylic resin swells due to water absorption, maintains an elastic state even after drying shrinkage, and repeats swelling if water is included again. Since the water is stopped by making use of the properties, there is no fear of re-forming the gap due to shrinkage of the water-stopping material after curing, and a stable and long-term water-stopping effect can be expected.

また、粘度1〜5mPa・sで比重1.075±0.025のアクリル酸ナトリウムを主成分とする第1主剤と、粘度1〜5mPa・sで比重1.025±0.025の過硫酸ナトリウムを主成分とする第2主剤と、硬化時間を調整する硬化調整剤から構成される止水材を用いて止水部を設ける場合には、硬化した止水部を弾力性、密着性、接着力に富むもの、水や有機物による溶脱がないものとすることができ、覆工コンクリート2の背面が地盤の場合には地盤の安定化を期することも可能となる。また、止水部がアルカリ性となるため、中性化した覆工コンクリート2の健全性を復元することができる。また、止水材の比重が水に近いため、現に水漏れが生じている場合でも、水に浮いたり沈んだりすることなく、きちんと止水材を行き渡らせることができる。また、硬化調整剤の添加量を調整することにより、ゲルタイムを現場状況に応じてその場で調整することも可能となる。   Moreover, the 1st main ingredient which has a specific gravity of 1.075 ± 0.025 as a main component with a viscosity of 1-5 mPa · s, and a sodium persulfate with a specific gravity of 1.025 ± 0.025 with a viscosity of 1-5 mPa · s. In the case of providing a water-stop part using a water-stop material composed of a second main component mainly composed of selenium and a curing regulator that adjusts the curing time, the cured water-stop part is provided with elasticity, adhesion, and adhesion. It is possible to make the material rich in force and not to be leached by water or organic matter, and when the back surface of the lining concrete 2 is the ground, the ground can be stabilized. Moreover, since a water stop part becomes alkaline, the soundness of the neutralized lining concrete 2 can be restored | restored. In addition, since the specific gravity of the water-stopping material is close to that of water, the water-stopping material can be properly distributed without floating or sinking in the water even when water leakage actually occurs. Further, by adjusting the addition amount of the curing modifier, it is possible to adjust the gel time on the spot according to the on-site situation.

また、補修構造を施工する際に、覆工コンクリート2の表面からの止水材の滲み出しを目視して注入完了を効率的に認識することができ、より一層施工効率を向上することができる。   Moreover, when constructing the repair structure, the seepage of the water-stopping material from the surface of the lining concrete 2 can be visually observed to recognize the completion of the injection, and the construction efficiency can be further improved. .

なお、上記の実施例においては、ひび割れ5の覆工コンクリート2の裏面側の開口から外側に一部が流れて、その開口を覆うようにして止水部9bが形成されている例を述べたが、本発明は、注入孔6をひび割れ5に交差させてこれを充填することを必須要件とはしておらず、止水材を躯体に対して広範囲に拡散浸透させるものである為、図示例は、注入孔6がひび割れ5に当たってしまって、表面側にリターンしてこない場合の対処として、硬化促進剤を止水材に追加で混合添加して使用し、止水部9bを形成した場合の例であり、注入孔6がひび割れ5に当たらなかった場合にはこうした処理は不要である。或いは、現場条件によっては、硬化促進剤の使用量を抑制し、覆工コンクリート2を貫通するひび割れ5を利用して裏面側の背面空洞4に積極的に止水材を流し込み、背面空洞4を止水材で充填しても構わない。   In addition, in said Example, the part which flowed outside from the opening by the side of the back surface of the lining concrete 2 of the crack 5 and the water stop part 9b was formed so that the opening might be covered was described. However, according to the present invention, it is not an essential requirement that the injection hole 6 intersects and fills the crack 5, and the water-stopping material is diffused and permeated over a wide range. In the example shown, as a countermeasure when the injection hole 6 hits the crack 5 and does not return to the surface side, a hardening accelerator is additionally added to the waterstop material and used to form the waterstop portion 9b. This process is not necessary when the injection hole 6 does not hit the crack 5. Alternatively, depending on the field conditions, the amount of the curing accelerator used is suppressed, and a water-stopping material is actively poured into the back cavity 4 on the back side using the cracks 5 penetrating the lining concrete 2. You may fill with a water stop material.

〔実施形態の変形例等〕
本明細書開示の発明は、各発明、実施形態、各例の他に、適用可能な範囲で、これらの部分的な構成を本明細書開示の他の構成に変更して特定したもの、或いはこれらの構成に本明細書開示の他の構成を付加して特定したもの、或いはこれらの部分的な構成を部分的な作用効果が得られる限度で削除して特定した上位概念化したものを含むものであり、下記変形例も包含する。
[Modifications of Embodiment, etc.]
The invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification, in addition to the respective inventions, embodiments, and examples, to the extent applicable. Those that are specified by adding other configurations disclosed in this specification to these configurations, or those that have been identified by deleting these partial configurations to the extent that partial effects can be obtained and specifying them The following modifications are also included.

例えば本発明のコンクリート構造物の補修構造或いはその施工方法の適用対象は、トンネルの覆工コンクリート2に限定されず、地下施設、建築物等の各種コンクリート構造物の補修に適用することができる。また、本発明で使用する止水材は、粘度5mPa・s以下の主剤から構成される止水材であれば、本発明の趣旨の範囲内で適宜である。   For example, the application object of the repair structure of the concrete structure or the construction method of the present invention is not limited to the tunnel lining concrete 2 but can be applied to repair of various concrete structures such as underground facilities and buildings. Moreover, if the water stop material used by this invention is a water stop material comprised from the main ingredient with a viscosity of 5 mPa * s or less, it is appropriate within the meaning of the present invention.

本発明は、例えばトンネル、地下施設、建築物等のコンクリート構造物で発生する漏水を止水する際に利用することができる。   The present invention can be used, for example, when water leakage generated in a concrete structure such as a tunnel, an underground facility, or a building is stopped.

1…トンネル 2…覆工コンクリート 3…土壌 4…背面空洞 5…ひび割れ 6…注入孔 7…パッカー 8a、8b、9a、9b、10…止水部 15…シール材 16…低圧ポンプ 17…ミキシングユニット LW…漏水 20…コンクリート壁 21…ひび割れ 22…注入孔 23…急結セメント 24…止水部 25…貫通孔 26…止水膜 31…土壌 32…背面空洞
DESCRIPTION OF SYMBOLS 1 ... Tunnel 2 ... Covering concrete 3 ... Soil 4 ... Back cavity 5 ... Crack 6 ... Injection hole 7 ... Packer 8a, 8b, 9a, 9b, 10 ... Water stop part 15 ... Sealing material 16 ... Low pressure pump 17 ... Mixing unit LW ... Leakage 20 ... Concrete wall 21 ... Crack 22 ... Injection hole 23 ... Quick setting cement 24 ... Water stop part 25 ... Through hole 26 ... Water stop film 31 ... Soil 32 ... Back cavity

Claims (2)

コンクリートの止水対象領域に前記コンクリートの表面側から非貫通で形成され、前記止水対象領域に間隔を開けて複数設けられる注入孔と、
前記注入孔の各々に略充填するように設けられ、且つ前記注入孔の各々を起点として拡散し前記コンクリートの微小空隙に浸透するように設けられる止水部とを備え、
前記止水部が、粘度1〜5mPa・sで比重1.075±0.025のアクリル酸ナトリウムを主成分とする第1主剤と、粘度1〜5mPa・sで比重1.025±0.025の過硫酸ナトリウムを主成分とする第2主剤と、硬化時間を調整する硬化調整剤から構成される止水材によって形成されていることを特徴とするコンクリート構造物の補修構造。
A non-penetration formed from the surface side of the concrete to the water stop target area of concrete, and a plurality of injection holes provided at intervals in the water stop target area,
A water stop portion provided so as to substantially fill each of the injection holes, and provided so as to diffuse from each of the injection holes as a starting point and penetrate into the minute voids of the concrete,
The water stop part has a viscosity of 1 to 5 mPa · s and a specific gravity of 1.075 ± 0.025 as a main component, and a viscosity of 1 to 5 mPa · s and a specific gravity of 1.025 ± 0.025. A structure for repairing a concrete structure, characterized in that it is formed of a water-stopping material composed of a second main component mainly composed of sodium persulfate and a curing regulator that adjusts the curing time .
請求項1記載のコンクリート構造物の補修構造の施工方法であって、
前記注入孔を形成して、前記注入孔の孔奥と孔外の連通を閉塞可能なパッカーを前記注入孔の口元に設置する第1工程と、
粘度1〜5mPa・sで比重1.075±0.025のアクリル酸ナトリウムを主成分とする第1主剤と、粘度1〜5mPa・sで比重1.025±0.025の過硫酸ナトリウムを主成分とする第2主剤と、硬化時間を調整する硬化調整剤を混合しつつ、前記止水材として、前記注入孔の口元の連通部分から前記注入孔内に200kPa以下の圧力で注入する第2工程と、
前記コンクリートの表面からの前記止水材の滲み出しを確認する第3工程と
を備えることを特徴とするコンクリート構造物の補修構造の施工方法。
A construction method for a repair structure of a concrete structure according to claim 1,
A first step of forming the injection hole, and installing a packer at the mouth of the injection hole that can close the back of the injection hole and communication outside the hole;
Main component is a first main ingredient mainly composed of sodium acrylate having a viscosity of 1 to 5 mPa · s and a specific gravity of 1.075 ± 0.025, and sodium persulfate having a viscosity of 1 to 5 mPa · s and a specific gravity of 1.025 ± 0.025. A second main agent that is a component and a curing regulator that adjusts the curing time are mixed, and the water-stopping material is injected into the injection hole at a pressure of 200 kPa or less from the communicating portion at the mouth of the injection hole. Process,
And a third step of confirming the seepage of the water-stopping material from the surface of the concrete. A method for constructing a repair structure for a concrete structure, comprising:
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