JP2014001627A - Water cut-off method by means of rear face injection - Google Patents

Water cut-off method by means of rear face injection Download PDF

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JP2014001627A
JP2014001627A JP2013195343A JP2013195343A JP2014001627A JP 2014001627 A JP2014001627 A JP 2014001627A JP 2013195343 A JP2013195343 A JP 2013195343A JP 2013195343 A JP2013195343 A JP 2013195343A JP 2014001627 A JP2014001627 A JP 2014001627A
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JP5567728B2 (en
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Yukio Isozaki
幸男 磯崎
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SANSEI KAKO KK
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Abstract

PROBLEM TO BE SOLVED: To provide a water cut-off method by means of rear face injection for enabling efficient and reliable water cut-off incomplete in a conventional technique, (1) at a site where a number of water leaking cracks exist with high density, (2) at a site (a rock pocket or a honeycomb) where water leaks from cavities in a concrete structure, and (3) at a site where a water leakage passage cannot be identified.SOLUTION: The water cut-off method by means of rear face injection includes a step of providing an injection hole penetrating from the surface of the concrete structure toward the rear face thereof, a step of injecting cut-off agent into the injection hole, and a step of hardening the cut-off agent to form a cut-off film between the rear face of the concrete structure and covering soil contacting the rear face. The cut-off agent used in the step of injecting the cut-of agent includes at least water-based polymer dispersion liquid and hardening accelerator. The cut-off agent has a specific gravity of 1.03-1.04. In the step to form the water cut-off film, the water cut-out film is radially spread along the rear face around the exit of the injection hole and then hardened.

Description

本発明は裏面注入止水工法に関し、詳しくは、コンクリート構造物の漏水を止水するために、該コンクリート構造物の裏面に止水剤を注入する裏面注入止水工法に関する。   The present invention relates to a back surface injection water stop method, and more particularly to a back surface injection water stop method in which a water stop agent is injected into the back surface of a concrete structure in order to stop water leakage of the concrete structure.

土木、建築構造物からの水漏れや雨漏りは、当該構造物を供用、使用する上で非常な障害となる。特に構造物が鉄筋コンクリート等のコンクリート構造物である場合、該構造物のひび割れ、コールドジョイント、ジャンカ等から漏水を起こすおそれがあり、この漏水が原因で、内部鉄筋の発錆やコンクリートの中性化が進み、構造物そのものの耐久性を著しく低下させる。   Water leaks and rain leaks from civil engineering and building structures are very hindrances in the use and use of such structures. In particular, when the structure is a concrete structure such as reinforced concrete, there is a risk of water leakage from cracks, cold joints, jumpers, etc. of the structure. Advances, and the durability of the structure itself is significantly reduced.

このような漏水を防止する対策としては、導水工法、シール工法、充填工法、注入工法が知られている。   As measures for preventing such water leakage, a water conveyance method, a seal method, a filling method, and an injection method are known.

導水工法は、漏水は止めないで、樋、ホース埋め込み、溝切り等によって障害の少ない箇所に水を導き、逃す方法である。しかし、この工法では導水管の内部に遊離石灰などが沈着し、閉塞して、短時間で再漏水してしまう。また、鉄筋コンクリートの早期劣化は止められず、一時しのぎにしか過ぎない。   In the water guide method, water leakage is not stopped, but water is led to a location with few obstacles by dredging, hose embedding, grooving, etc., and let it escape. However, in this construction method, free lime and the like are deposited inside the water conduit, blockage, and water leaks again in a short time. In addition, early deterioration of reinforced concrete cannot be stopped and is only temporary.

シール工法は、ひび割れや各種目地部を表側からシールすることにより漏水する出口を閉塞する方法である。シール材にはポリマー系、無機質セメント系など各種がある。しかし、漏水の出口を塞ぐと近くの別な個所で漏水が始まる問題がある。また、シール材の耐久性が短く、短時間で再漏水する問題もある。この方法はごく軽微な漏水に対して、短期的な効果はあるが、本格的な止水工法ではない。   The sealing method is a method of closing an outlet that leaks water by sealing cracks and various joints from the front side. There are various types of sealing materials such as polymer and inorganic cement. However, there is a problem that water leakage starts at another nearby location when the outlet of the water leakage is blocked. Moreover, there is a problem that the durability of the sealing material is short and water leaks again in a short time. Although this method has a short-term effect on very slight water leakage, it is not a full-scale water stop method.

充填工法は、漏水経路の空隙を表側からはつり閉塞する方法であり、ひび割れ、目地、打ち継ぎ部、コールドジョイント等の漏水原因と特定できる空隙を閉塞するものである。しかし、この方法は、はつりの作業を伴い、騒音、粉塵、コンクリートガラなど建設廃材が多量に発生し、コストが高いわりには止水効果が不安定である。   The filling method is a method in which the gap in the water leakage path is suspended from the front side, and the gap that can be identified as the cause of water leakage such as cracks, joints, joints, and cold joints is closed. However, this method involves a work of lifting, and a large amount of construction waste such as noise, dust, and concrete glass is generated, and the water stop effect is unstable at a high cost.

注入工法は、漏水経路の空隙に止水剤を注入する方法であり、特定できる漏水経路の空隙に止水剤を注入して、空隙を表側から閉塞するものである。止水剤は、コンクリートに削孔した注入孔から圧入される。空隙は構造物の内部で閉塞するため、この方法は、特定できる限定された箇所の漏水対策としては有効である。しかし、漏水ひび割れが多数、高密度に存在する箇所、コンクリートの組織の空隙から漏水する箇所(ジャンカ、豆板)、漏水経路が特定できない箇所の止水工法としては不向きである。   The injection method is a method of injecting a water-stopping agent into the gap of the water leakage path, and injecting the water-stopping agent into the gap of the water leakage path that can be specified to close the gap from the front side. The water-stopping agent is press-fitted from an injection hole drilled in the concrete. Since the void is closed inside the structure, this method is effective as a countermeasure against water leakage in a limited area that can be specified. However, it is unsuitable as a water stop construction method for places where there are many water cracks, high density, places where water leaks from voids in the concrete structure (junka, beans), and places where the water leak path cannot be specified.

このため、コンクリート構造物に壁面を貫通する注入孔を形成し、この注入孔から該構造物の裏面に止水剤を注入する裏面注入止水工法が提案されている(特許文献1)。この方法によれば、構造物の裏面に注入された止水剤によって漏水箇所を水の浸入側で遮断するので、止水効果が高く、水による内部鉄筋の発錆やコンクリートの中性化による早期劣化が予防でき、コンクリート構造物の耐久性向上にも貢献できると考えられる。   For this reason, the back surface injection water stop construction method which forms the injection hole which penetrates a wall surface in a concrete structure, and inject | pours a water stop agent into the back surface of this structure from this injection hole is proposed (patent document 1). According to this method, water leakage is blocked at the water ingress side by the water-stopping agent injected into the back surface of the structure, so the water-stopping effect is high, due to rusting of internal rebar due to water and neutralization of concrete It is thought that early deterioration can be prevented and the durability of concrete structures can also be improved.

特開平5−247958号公報JP-A-5-247958

従来、このような裏面注入止水工法として、微粒子のセメントをスラリー状にした止水剤を用いて行う工法(スーパーロック工法)が知られている。止水剤は注入孔からコンクリート構造物の裏面にポンプを用いて注入されることで、コンクリート構造物の裏面に止水膜を形成するものである。   2. Description of the Related Art Conventionally, as such a back surface injection water stop method, a method (super lock method) that uses a water stop agent in which fine particle cement is made into a slurry is known. The water-stopping agent is injected from the injection hole to the back surface of the concrete structure using a pump, thereby forming a water-stop film on the back surface of the concrete structure.

しかしながら、セメントのスラリー状の止水剤は、比重が2.0〜3.0と大きいため、このような止水剤を注入孔からコンクリート構造物の裏面に注入すると、注入孔の出口の周囲では注入圧の影響で僅かに拡散するが、特に縦壁面では、図5に示すように、注入孔10の出口から直ぐに下方に向けて沈降してしまう。このため、注入孔10を中心としてその周囲に広範囲に止水膜を形成することができずに局所的な止水膜20が形成されるだけとなり、縦壁面において漏水ひび割れが多数、高密度に存在する場合あるいは漏水経路が特定できない場合には、有効な止水膜を形成するために極めて多量の止水剤を注入しなくてはならない問題がある。   However, since the cement slurry-like water stop agent has a large specific gravity of 2.0 to 3.0, when such a water stop agent is injected from the injection hole to the back surface of the concrete structure, the area around the outlet of the injection hole Then, it slightly diffuses due to the influence of the injection pressure, but particularly on the vertical wall surface, as shown in FIG. 5, it immediately sinks downward from the outlet of the injection hole 10. For this reason, a water-stop film cannot be formed in a wide range around the injection hole 10 but only a local water-stop film 20 is formed. When it exists or when the water leakage path cannot be specified, there is a problem that a very large amount of water stopping agent must be injected to form an effective water stopping film.

そこで、本発明は、注入孔からコンクリート構造物の裏面側に注入した止水剤が、縦壁面であっても下方に沈降することなく、注入孔の出口から該裏面に沿うように放射状に拡散させて広範囲に亘る止水膜を形成できるようにすることにより、従来の技術では不完全であった(1)漏水ひび割れが多数、高密度に存在する箇所、(2)コンクリートの組織の空隙から漏水する箇所(ジャンカ、豆板)、(3)漏水経路が特定できない箇所について効率的で且つ確実な止水を行うことができる裏面注入止水工法を提供することを課題とする。   Therefore, the present invention is such that the water-stopper injected from the injection hole to the back surface side of the concrete structure is diffused radially from the injection hole outlet along the back surface without sinking downward, even on the vertical wall surface. By making it possible to form a water-stopping film over a wide range, it was incomplete in the prior art (1) where there are many water-cracking cracks at high density, and (2) from the voids in the concrete structure It is an object of the present invention to provide a back surface injection water stop construction method capable of performing efficient and reliable water stop for locations where water leaks (junka, bean plate) and (3) locations where a water leak path cannot be specified.

本発明の他の課題は、以下の記載により明らかとなる。   Other problems of the present invention will become apparent from the following description.

上記課題は、以下の各発明によって解決される。   The above problems are solved by the following inventions.

1.コンクリート構造物の表面から裏面に向かって貫通する注入孔を設ける工程と、
該注入孔に止水剤を注入する工程と、
該コンクリート構造物の裏面と該裏面に接する被覆土壌の間に、前記止水剤を硬化させた止水膜を形成する工程と、を有する裏面注入止水工法において、
前記止水剤を注入する工程に用いる止水剤は、少なくとも水性ポリマー系分散液と硬化促進剤とを含み、該止水剤の比重は、1.03〜1.04であり、
前記止水膜を形成する工程が、前記注入孔の出口を中心として該裏面に沿うように、放射状に拡散して硬化させることを特徴とする裏面注入止水工法。
1. Providing an injection hole penetrating from the surface of the concrete structure toward the back surface;
Injecting a water-stopper into the injection hole;
In the back-side water-stopping construction method, comprising a step of forming a water-stopping film obtained by curing the water-stopping agent between the back surface of the concrete structure and the covered soil in contact with the back surface,
The water stopping agent used in the step of injecting the water stopping agent includes at least an aqueous polymer dispersion and a curing accelerator, and the specific gravity of the water stopping agent is 1.03 to 1.04.
The back surface injection water stop method is characterized in that the step of forming the water stop film diffuses and hardens radially along the back surface centering on the outlet of the injection hole.

本発明によれば、注入孔からコンクリート構造物の裏面側に注入した止水剤の比重が、1.03〜1.04であり、水と差異がない程度であるので、注入孔の出口から該裏面に沿うように放射状に拡散・硬化させて、広範囲に亘る止水膜を形成できる。その結果、従来の技術では不完全であった(1)漏水ひび割れが多数、高密度に存在する箇所、(2)コンクリートの組織の空隙から漏水する箇所(ジャンカ、豆板)、(3)漏水経路が特定できない箇所について効率的で且つ確実な止水を行うことができる。   According to the present invention, the specific gravity of the water-stopping agent injected from the injection hole to the back side of the concrete structure is 1.03 to 1.04, which is not different from water. A water-stopping film can be formed over a wide range by diffusing and curing radially along the back surface. As a result, the conventional technology was incomplete (1) where there were many water cracks and high density, (2) where water leaked from the voids in the concrete structure (junka, beans), (3) water leak path It is possible to efficiently and surely stop the water at a location where cannot be specified.

比重1.03〜1.04の止水剤を用いた注入、拡散確認試験の様子を示す写真Photograph showing the state of injection and diffusion confirmation tests using a water stopping agent with a specific gravity of 1.03 to 1.04 比重1.03〜1.04の止水剤を用いた注入、拡散確認試験の様子を示す写真Photograph showing the state of injection and diffusion confirmation tests using a water stopping agent with a specific gravity of 1.03 to 1.04 比重1.03〜1.04の止水剤を用いた注入、拡散確認試験の様子を示す写真Photograph showing the state of injection and diffusion confirmation tests using a water stopping agent with a specific gravity of 1.03 to 1.04 本発明に係る裏面注入止水工法をトンネルの漏水対策として適用する例を示す断面図Sectional drawing which shows the example which applies the back surface injection water stop construction method concerning this invention as a leaking measure of a tunnel 従来のセメントのスラリー状の止水剤を注入孔からコンクリート構造物の裏面に注入した様子を示す図The figure which shows a mode that the conventional cement slurry-like water stop agent was inject | poured into the back surface of the concrete structure from the injection hole.

本発明の第1の工程は、コンクリート構造物の表面から裏面に向かって貫通する注入孔を設ける工程である。   The 1st process of this invention is a process of providing the injection hole penetrated toward the back surface from the surface of a concrete structure.

本発明におけるコンクリート構造物とは、一般には型枠内にコンクリートを流し込んで構築された構造物であり、代表的には鉄筋コンクリート、プレキャストコンクリート、ALC(軽量気泡コンクリート)等が挙げられるが、石造、レンガ積み造の構造物であってもよい。   The concrete structure in the present invention is generally a structure constructed by pouring concrete into a mold, and typically includes reinforced concrete, precast concrete, ALC (lightweight cellular concrete), It may be a brick structure.

このようなコンクリート構造物の具体例としては、トンネル(共同溝を含む)、用水路、各種水槽の他、ビル、マンション、住宅の地下室やエレベータ、地下駐車場等の地下ピットがある。   Specific examples of such concrete structures include tunnels (including common grooves), irrigation channels, various water tanks, underground pits such as buildings, condominiums, residential basements and elevators, and underground parking lots.

コンクリート構造物の裏面は、水を含む土壌、SMW(Soil Mixing Wall)、シートパイル等の被覆物と接している。水を含む土壌と表現しているのは、以下の理由による。たとえばトンネルのような場合には、水圧が該裏面にかかっていることが普通であり、該裏面は被覆土壌によって均一に被覆されている訳ではない。水が該裏面に直接接している部位や、被覆土壌が接している部位が混在している。このため、コンクリート構造物の裏面を被覆している対象を、「水を含む土壌」と表現している。   The back surface of the concrete structure is in contact with a covering such as soil containing water, SMW (Soil Mixing Wall), sheet pile, or the like. The reason for expressing water-containing soil is as follows. For example, in the case of a tunnel, water pressure is usually applied to the back surface, and the back surface is not uniformly covered with the covered soil. A part where water is in direct contact with the back surface and a part where the covered soil is in contact are mixed. For this reason, the object which coat | covers the back surface of a concrete structure is expressed as "the soil containing water."

本発明では、コンクリート構造物の裏面からの漏水対策として本発明を適用することができ、縦壁に対しても本発明は良好な止水効果を発揮する。   In the present invention, the present invention can be applied as a measure against water leakage from the back surface of a concrete structure, and the present invention exhibits a good water stop effect even for a vertical wall.

注入孔の形成方法は、構造物の厚みに影響され、たとえば、1000mm以下ならば、ドリルなどで10mmφ程度の注入孔を形成する。それより厚くなれば、コアマシン、削岩機などを用い、10mmφを越える注入孔を形成する。   The method of forming the injection hole is influenced by the thickness of the structure. For example, if the thickness is 1000 mm or less, the injection hole is formed with a diameter of about 10 mmφ with a drill or the like. If it is thicker than that, an injection hole exceeding 10 mmφ is formed using a core machine, a rock drill or the like.

本発明では、注入孔の数を、従来法と比較して、少なくできる効果がある。後述する止水剤の拡散範囲が広く、しかも上方に多く拡散するために、1つの孔の止水範囲のエリアが大きいからである。   In the present invention, there is an effect that the number of injection holes can be reduced as compared with the conventional method. This is because the diffusion range of the water-stopping agent described later is wide and the area of the water-stopping range of one hole is large in order to diffuse more upward.

第2の工程は、第1の工程で形成された注入孔に止水剤を注入する工程であり、第3の工程は、コンクリート構造物の裏面と該裏面に接する被覆土壌の間に、前記止水剤を硬化させた止水膜を形成する工程である。   The second step is a step of injecting a water-stopping agent into the injection hole formed in the first step, and the third step is between the back surface of the concrete structure and the covered soil in contact with the back surface. This is a step of forming a water-stop film in which the water-stop agent is cured.

本発明において、止水剤は、少なくとも水性ポリマー系分散液と硬化促進剤とを含み、該止水剤の比重は、1.03〜1.04である。   In the present invention, the water stopping agent includes at least an aqueous polymer dispersion and a curing accelerator, and the specific gravity of the water stopping agent is 1.03 to 1.04.

本発明の止水剤には、水性ポリマー系分散液と硬化促進剤以外に、希釈水などを含むことができる。   In addition to the aqueous polymer dispersion and the curing accelerator, the water-stopping agent of the present invention can contain dilution water and the like.

本発明において止水剤の比重は、比重計によって測定でき、たとえば1リットルのメスシリンダーに投入後、浮標によって計測できる。   In the present invention, the specific gravity of the water-stopping agent can be measured with a hydrometer, for example, after being put into a 1 liter graduated cylinder, it can be measured with a buoy.

本発明では、止水剤の比重が重要であり、比重が水に極めて近いため、コンクリート構造物の裏面に注入されると(裏面には漏水の元となる水が存在している)、注入箇所が縦壁面の場合であっても、注入孔の出口を中心として、その多くが裏面に沿うように上方に向かって放射状に拡散していく。   In the present invention, the specific gravity of the water-stopping agent is important, and since the specific gravity is very close to water, when injected into the back surface of a concrete structure (the back surface contains water that is a source of water leakage), injection Even if the location is a vertical wall surface, many of them diffuse radially upward along the back surface, with the outlet of the injection hole as the center.

注入された止水剤は、やがて時間の経過とともに注入孔の出口を中心として周囲に広範囲に広がっていく。   The injected water-stopping agent spreads over a wide area around the outlet of the injection hole as time passes.

本発明の裏面注入止水工法は 縦壁の裏面のみならず、当然ながら天井面、床面の裏面にも適用できる。   The back surface water-stop method of the present invention can be applied not only to the back surface of the vertical wall but also to the back surface of the ceiling surface and the floor surface.

止水剤は横壁(たとえば天井や床など)の裏面に注入されれば、比重が 1.03〜1.04のため、水中に浮遊したりすることはなく、また裏面に沿って放射状に拡散する。   If the waterproofing agent is injected into the back of a horizontal wall (for example, ceiling or floor), the specific gravity will be 1.03 to 1.04, so it will not float in water and will diffuse radially along the back. To do.

また止水剤が縦壁の裏面に注入されれば、下方に沈降したりすることはなく、逆に放射状に拡散することはもとより、下方拡散領域の面積よりも上方拡散領域の面積が大きくなるように拡散する。ここで、下方拡散領域というのは、注入孔を基準とする水平線よりも下方の領域であり、上方拡散領域は、注入孔を基準とする水平線よりも上方の領域である。   Moreover, if the water-stopping agent is injected into the back of the vertical wall, it does not settle downward, but conversely diffuses radially, and the area of the upper diffusion region becomes larger than the area of the lower diffusion region. To diffuse. Here, the lower diffusion region is a region below the horizontal line based on the injection hole, and the upper diffusion region is a region above the horizontal line based on the injection hole.

本発明では、注入された止水剤が、コンクリート構造物の裏面に沿って放射状の広範囲に拡散し、所定の時間経過後に硬化して、止水膜を形成することが可能となる。   In the present invention, the injected water-stopping agent diffuses in a wide radial range along the back surface of the concrete structure, and is cured after a predetermined time to form a water-stopping film.

このため、従来の技術では不完全であった漏水ひび割れが多数、高密度に存在する箇所、コンクリートの組織の空隙から漏水する箇所(ジャンカ、豆板)、漏水経路が特定できない箇所についても効率的で且つ確実な止水を達成することができる。   For this reason, there are many water leakage cracks that were incomplete with conventional technology, high density locations, locations where water leaks from voids in the concrete structure (junka, bean plate), and locations where the water leakage path cannot be identified. And reliable water stop can be achieved.

本発明に用いられる水性ポリマー系分散液は、例えば、高分子物質として石油アスファルト(ストレート、ブローン)、熱可塑性樹脂(ブタジエン樹脂、エチレン酢酸ビニル、石油樹脂)の単体あるいは2種類以上を組み合わせたものに、ポバールの水溶液を混合して連続的に分散させ、製造されるもので、上記1.03〜1.04の比重範囲を満足するものが挙げられる。また本発明では、上記比重特性を満足する範囲内で、上記の水性ポリマー系分散液に、合成ゴムラテックス及び又はアクリル系ポリマーデイスパージョンを混合して得られるものを使用することもできる。   The aqueous polymer dispersion used in the present invention is, for example, a single or a combination of two or more types of petroleum asphalt (straight, blown) and thermoplastic resin (butadiene resin, ethylene vinyl acetate, petroleum resin) as a polymer substance. In addition, an aqueous solution of poval is mixed and continuously dispersed, and those manufactured satisfying the specific gravity range of 1.03 to 1.04 can be mentioned. Moreover, in this invention, within the range which satisfies the said specific gravity characteristic, what is obtained by mixing a synthetic rubber latex and / or an acrylic polymer dispersion in said aqueous polymer dispersion can also be used.

水性ポリマー系分散液には、微粉末にした固体(例えば、シリカなどの無機系物質、エポキシ、ポリエステルなどのような熱硬化性樹脂、及び高軟化点の熱可塑性樹脂など)を混合して使用することができる。   Use a mixture of finely divided solids (for example, inorganic substances such as silica, thermosetting resins such as epoxy and polyester, and thermoplastic resins having a high softening point) in aqueous polymer dispersions. can do.

ポバールの水溶液としては、上記比重の条件を満たし、コンクリート構造物の裏面に注入された際に、縦壁面であっても上方に向けて拡散できるようにする点で、重合度が300〜3,000、好ましくは500〜2,000、鹸化度が70〜98、好ましくは80〜90の部分鹸化ポバールの水溶液であることが好ましい。ポバールの濃度は、作業性や高濃度の分散液を製造する観点から10重量%程度が好ましく、この程度の濃度であれば数分で製造でき、製造時間の短縮上好ましい。   As an aqueous solution of poval, when the specific gravity is satisfied and injected into the back surface of the concrete structure, even if it is a vertical wall surface, the degree of polymerization is 300 to 3, It is preferably an aqueous solution of partially saponified poval having a viscosity of 000, preferably 500 to 2,000, and a saponification degree of 70 to 98, preferably 80 to 90. The concentration of the poval is preferably about 10% by weight from the viewpoint of workability and production of a highly concentrated dispersion, and such a concentration can be produced in several minutes, which is preferable in terms of shortening the production time.

ポバール水溶液の添加量は、粘度適正や注入後の拡散性、耐水性等を考慮し、高分子物質からなる原料に対して0.5〜10%(高分子物質からなる原料及びポバールを固形分として)が好ましく、より好ましくは1〜3%である。   The addition amount of the poval aqueous solution is 0.5 to 10% with respect to the raw material made of the polymer substance in consideration of the viscosity appropriateness, the diffusibility after the injection, the water resistance, etc. As), more preferably 1 to 3%.

また、乳化剤としてポバールの水溶液を使用するだけでエマルジョンは製造できるが、エマルジョンの粒子径をより小さく均質化するために界面活性剤を併用することが好ましい。界面活性剤としては、カチオン系、アニオン系、ノニオン系のいずれのものも用いることができる。界面活性剤の添加量は種類にもよるが、高分子物質からなる原料に対して、0.01〜5%(高分子物質からなる原料及び界面活性剤を固形分として)が好ましい。   In addition, an emulsion can be produced simply by using an aqueous poval solution as an emulsifier, but it is preferable to use a surfactant in order to make the particle size of the emulsion smaller and homogenized. As the surfactant, any of cationic, anionic and nonionic surfactants can be used. The amount of the surfactant added depends on the type, but is preferably 0.01 to 5% (based on the polymer material and the surfactant as a solid content) with respect to the polymer material.

界面活性剤を使用する場合、アニオン系とノニオン系を組み合わせて使用することが好ましく、好ましい添加量としてはアニオン系2%、ノニオン系0.3%になるように配合することである。   In the case of using a surfactant, it is preferable to use a combination of an anionic type and a nonionic type, and a preferable addition amount is to mix 2% anionic type and 0.3% nonionic type.

高分子物質とポバール水溶液を混合する設備としては、格別限定されず、各種混練機やミル等を使用することができる。   The equipment for mixing the polymer substance and the poval aqueous solution is not particularly limited, and various kneaders, mills, and the like can be used.

本発明に用いられる止水剤は、粒子径が0.4〜0.6μmであることが好ましい。コンクリート構造物の縦壁面の裏面に注入された場合でも上方に向かってより良好に拡散させることができるようにするためである。   The water stopping agent used in the present invention preferably has a particle size of 0.4 to 0.6 μm. This is because even when injected into the back surface of the vertical wall surface of the concrete structure, it can be diffused better upward.

粒子径が細かいことで、コンクリート構造物の裏面にある微細な漏水経路の空隙に逆流、浸透し易く、また、漏水箇所内部においてコンクリートとも良好に密着して漏水経路をより効率良く且つ確実に遮断することができる効果が得られる。   The small particle size makes it easy to backflow and penetrate into the gaps in the fine water leakage path on the back of the concrete structure, and also closes the water leakage path more efficiently and reliably by adhering well to the concrete inside the water leakage location. The effect which can be done is acquired.

なお、セメントのスラリー状の止水剤は、粒子径が3.0μm以上と大きいため、コンクリート構造物の裏面に存在する水との拡散性も良くなく、漏水経路に浸透しにくく、コンクリート構造物との付着力も小さい。しかも、止水膜が固く、脆いため、構造物の動きに追随できない問題がある。   In addition, since the cement slurry-like water stopping agent has a large particle size of 3.0 μm or more, it does not have good diffusibility with water existing on the back surface of the concrete structure, and is difficult to penetrate into the water leakage path. Adhesive strength is also small. Moreover, since the water blocking film is hard and brittle, there is a problem that it cannot follow the movement of the structure.

本発明において、水性ポリマー系分散液の硬化促進剤としてイソシアネートプレポリマーを、水性ポリマー系分散液に対して3〜5重量%添加混合する方法が望ましい。この方法では、比重特性が満足し、粒子径も0.4〜0.6μmの範囲に収まる。   In the present invention, a method of adding and mixing 3 to 5% by weight of an isocyanate prepolymer as a curing accelerator for the aqueous polymer dispersion is desirable with respect to the aqueous polymer dispersion. In this method, the specific gravity characteristics are satisfied, and the particle diameter falls within the range of 0.4 to 0.6 μm.

硬化時間は、裏面の温度の影響を受け、硬化促進剤を5%添加すると、水中でも5℃ならば、24時間、30℃ならば4時間で硬化し、止水膜を形成する。   The curing time is affected by the temperature of the back surface, and when 5% of a curing accelerator is added, it cures in water at 5 ° C. for 24 hours and at 30 ° C. for 4 hours to form a water stop film.

なお、硬化促進剤として、上記の他に、セメントスラリーを5〜10重量%添加混合する手法もある。この方法では、比重が大きくなり、拡散性が低下し、更に粒子径も粗くなって、微細な空隙を充填、閉塞できない。更に硬化時間も、20℃でも24時間を必要とし、実用的ではない。   In addition to the above, as a hardening accelerator, there is also a method of adding and mixing 5 to 10% by weight of cement slurry. In this method, the specific gravity is increased, the diffusibility is lowered, the particle diameter is also coarsened, and fine voids cannot be filled or closed. Furthermore, the curing time requires 24 hours even at 20 ° C., which is not practical.

本発明では、止水剤の比重が水に近いため、縦壁面であっても下方に沈降することなく広範囲に亘って薄く拡散して止水膜を形成することができるので、使用量を抑えることができる。一つの注入孔における止水範囲が大きいからである。本発明では、1注入孔あたりの注入量は6〜10kg/m2とすることが好ましく、従来のセメントスラリー状の止水剤を用いた場合(スーパーロック工法)の使用量(15〜20kg/m2)に比べて半分で済む。   In the present invention, since the specific gravity of the water-stopping agent is close to that of water, even if it is a vertical wall surface, it can diffuse thinly and form a water-stopping film over a wide range without sinking downward, thus reducing the amount used. be able to. This is because the water stoppage range in one injection hole is large. In the present invention, the injection amount per injection hole is preferably 6 to 10 kg / m 2, and the usage amount (15 to 20 kg / m 2) when a conventional cement slurry-like water-stopping agent is used (super rock method). ) Half compared to).

また、本発明では、コンクリート構造物からの漏水の量及び漏水の吐出圧が異常に大きい場合には、注入した止水剤が短時間に押し出されるおそれがあるため、水と超短時間で反応し発泡するウレタン樹脂などを事前に注入し、水の吐出量を低減したり、あるいは、当該止水剤を注入した直後に発泡ウレタン樹脂を注入して硬化時間を著しく短縮し、止水剤が押し出されるのを抑制することができる。   In the present invention, when the amount of water leakage from the concrete structure and the discharge pressure of the water leakage are abnormally large, the injected water-stopping agent may be pushed out in a short time. Inject foamed urethane resin in advance to reduce the amount of water discharged, or immediately after injecting the water-stopping agent, foam urethane resin is injected to significantly shorten the curing time. Extrusion can be suppressed.

以下、実施例により、本発明を更に詳述する。   Hereinafter, the present invention will be described in more detail by way of examples.

実施例1
<水性ポリマー系分散液の物性>
1.比重
本発明に用いる止水剤である水性ポリマー系分散液をして、三生化工社製「アルファー・ゾルG」を用いる。この水性ポリマー系分散液について、比重計を用いて、比重を測定した。その結果を表1に示す。
Example 1
<Physical properties of aqueous polymer dispersion>
1. Specific gravity An “alpha sol G” manufactured by Sansei Chemical Co., Ltd. is used as an aqueous polymer dispersion which is a water-stopping agent used in the present invention. The specific gravity of this aqueous polymer dispersion was measured using a hydrometer. The results are shown in Table 1.

硬化剤5%添加した水性ポリマー系分散液の比重測定
「アルファー・ゾルG」1kgに対して、50gの硬化剤と、50gの水を添加して、電動攪拌機にて60秒攪拌し、1Lのメスシリンダーに全量投入後、比重計で比重を測定した。その結果を表1に示す。
Specific gravity measurement of aqueous polymer dispersion added with 5% curing agent Add 50g curing agent and 50g water to 1kg of "Alpha Sol G", stir for 60 seconds with electric stirrer, After putting the whole amount into the graduated cylinder, the specific gravity was measured with a hydrometer. The results are shown in Table 1.

比較品である市販の止水剤「ビトグラウト」(ナルライトとも称する)について、「ビトグラウト」単独の比重、上記(2)と同様な硬化剤5%添加した「ビトグラウト」の比重を測定し、その結果を表1に示す。   Regarding the comparative water-stopping agent “Vitogrout” (also referred to as Nallite), the specific gravity of “Vitogrout” alone, the specific gravity of “Vitogrout” added with 5% of the same curing agent as in (2) above, and the result Is shown in Table 1.

以上の表1より、アルファー・ゾルGのみ、及び硬化剤添加アルファー・ゾルGは、いずれも本発明の比重範囲1.03〜1.04を満足する。   From Table 1 above, only the alpha sol G and the curing agent-added alpha sol G satisfy the specific gravity range of 1.03 to 1.04 of the present invention.

これに対して、市販品ビトグラウトのみ、及び硬化剤添加ビトグラウトは、本発明の比重範囲を満足せず、本発明の止水剤としては使用できない。   On the other hand, only the commercially available bite grout and the hardener-added bit grout do not satisfy the specific gravity range of the present invention, and cannot be used as the water-stopping agent of the present invention.

2.pH
アルファー・ゾルG:pH7.0〜7.5
ビトグラウト:pH4.7〜5.7
2. pH
Alpha sol G: pH 7.0 to 7.5
Vito grout: pH 4.7-5.7

止水剤には、硬化促進剤を含むが、この硬化促進剤は中和作用があり、ビトグラウトに多く加えれば中和できる。しかし添加量が少なかったり、ばらつくと酸性になり、コンクリートの裏面やひび割れ入り込むと、コンクリートの早期劣化を招く欠点があるので、本発明では使用できない。   The water-stopping agent contains a curing accelerator, but this curing accelerator has a neutralizing action, and can be neutralized if added in a large amount to the bit grout. However, if the amount added is small or varies, it becomes acidic, and if it enters into the back surface or cracks of concrete, there is a drawback of causing early deterioration of the concrete, so it cannot be used in the present invention.

これに対して、本発明に用いるアルファー・ゾルGは、pH7.0〜7.5であり、上記の問題がない点で優れている。   On the other hand, alpha sol G used in the present invention has a pH of 7.0 to 7.5 and is excellent in that it does not have the above problem.

実施例2
図1〜図3は、かかる比重1.03〜1.04の水性ポリマー系分散液を用いた注入、拡散確認試験の様子を示している。
Example 2
1 to 3 show the state of an injection and diffusion confirmation test using such an aqueous polymer dispersion having a specific gravity of 1.03 to 1.04.

試験装置は、コンクリート製U字溝の側面に、縦壁面として透明のアクリル板(厚10mm)をハラミのないように金属棒で固定して構成した。この試験装置の内部に、締め固めた土砂を充填し、土砂全体が湿潤状態になるまで水を浸した。アクリル板の下部中央には注入孔をドリルで貫通形成し、この注入孔にプラグを取り付けて高圧注入ポンプを用いて水性ポリマー系分散液(三生化工社製「アルファー・ゾルG」、比重1.03)を注入した(注入量:10kg/m)。 The test apparatus was configured by fixing a transparent acrylic plate (thickness 10 mm) as a vertical wall surface to the side surface of the concrete U-shaped groove with a metal rod so that there was no harassment. The test apparatus was filled with compacted earth and sand, and water was immersed until the entire earth and sand became wet. An injection hole is drilled in the center of the lower part of the acrylic plate, a plug is attached to the injection hole, and an aqueous polymer dispersion (“Alpha Sol G” manufactured by Sansei Chemical Co., Ltd., specific gravity 1 is used using a high-pressure injection pump). 0.03) (injection amount: 10 kg / m 2 ).

アクリル板には、拡散具合の確認のため、注入孔を中心とする10cm間隔の同心円状の目盛が付されている(図1)。   The acrylic plate is provided with concentric scales at intervals of 10 cm with the injection hole as the center for confirmation of the diffusion condition (FIG. 1).

注入孔の出口からアクリル板の裏面と土砂との間に浸透した注入直後の止水剤(図中白色で示される。)は、下方に沈降することなく、その多くがアクリル板の裏面に沿うように上方に向けて放射状に拡散した(図2)。   Most of the water-stopper that has just penetrated between the back of the acrylic plate and the earth and sand from the outlet of the injection hole (shown in white in the figure) does not settle downward, but mostly follows the back of the acrylic plate. Thus, it diffused radially upward (FIG. 2).

その後、所定量の止水剤を注入し終えると、止水剤は注入孔の出口を中心として、その周囲に放射状に拡散し、アクリル板の裏面に沿うように広範囲に亘って止水膜を形成した(図3)。   Thereafter, when the predetermined amount of water-stopping agent has been injected, the water-stopping agent diffuses radially around the outlet of the injection hole, and forms a water-stopping film over a wide area along the back surface of the acrylic plate. Formed (FIG. 3).

このように比重1.03〜1.04の水性ポリマー系分散液からなる止水剤を用いることにより、縦壁面であっても注入孔の出口を中心としてその上方に向かって放射状に拡散させることができ、止水膜が局所的にならず広範囲に亘る止水膜を形成できることがわかる。   In this way, by using a water-stopping agent composed of an aqueous polymer dispersion having a specific gravity of 1.03 to 1.04, even if it is a vertical wall surface, it is diffused radially upward around the outlet of the injection hole. It can be seen that the waterproof film can be formed over a wide range without being localized.

実施例3
本発明に係る裏面注入止水工法の具体的な適用例を図4に示す。図4は本発明に係る裏面注入止水工法をトンネルの漏水対策として適用する例を示しており、トンネル壁面の裏面に止水剤を注入する場合の断面図を示している。図中、1はトンネル、2はコンクリート構造物であるトンネル壁面、3はトンネル壁面2の裏面(トンネル1の反対面)に接する土であり、トンネル壁面2の裏面との間には水が存在している空隙4を有する箇所もある。
Example 3
FIG. 4 shows a specific application example of the back surface injection water stop method according to the present invention. FIG. 4 shows an example in which the back surface injection water stop method according to the present invention is applied as a countermeasure against water leakage in a tunnel, and shows a cross-sectional view when a water stop agent is injected into the back surface of a tunnel wall surface. In the figure, 1 is a tunnel, 2 is a tunnel wall surface which is a concrete structure, 3 is soil in contact with the back surface of the tunnel wall surface 2 (opposite surface of the tunnel 1), and water exists between the back surface of the tunnel wall surface 2 There is also a portion having a gap 4 that is open.

注入孔5は、トンネル壁面2を完全に貫通する直径10mm程度の貫通孔を、トンネル壁面2に1000mmピッチで形成した。この注入孔5にプラグ(図示せず)を装着し、高圧注入ポンプで上述した止水剤を注入すると、止水剤はトンネル壁面2の裏面の空隙4内の水に注入される。この空隙4内の水にはトンネル壁面2に均等に圧がかかっているため、止水剤はトンネル壁面2に沿って放射状に拡散し、また、縦壁面の裏面においても下方に沈降することなく、トンネル壁面2の裏面の広範囲に亘って所定厚の止水膜6を形成することができ、効率的で且つ確実な止水を行うことができる。   As the injection holes 5, through holes having a diameter of about 10 mm that completely penetrate the tunnel wall surface 2 were formed in the tunnel wall surface 2 at a pitch of 1000 mm. When a plug (not shown) is attached to the injection hole 5 and the above-described water-stopping agent is injected by a high-pressure injection pump, the water-stopping agent is injected into the water in the gap 4 on the back surface of the tunnel wall surface 2. Since the water in the gap 4 is evenly pressurized on the tunnel wall 2, the water-stopping agent diffuses radially along the tunnel wall 2 and does not settle downward on the back of the vertical wall. Further, the water blocking film 6 having a predetermined thickness can be formed over a wide range of the back surface of the tunnel wall surface 2, and efficient and reliable water blocking can be performed.

1:トンネル
2:トンネル壁面
3:土
4:空隙
5:注入孔
6:止水膜
1: Tunnel 2: Tunnel wall surface 3: Earth 4: Air gap 5: Injection hole 6: Water blocking film

Claims (1)

コンクリート構造物の表面から裏面に向かって貫通する注入孔を設ける工程と、
該注入孔に止水剤を注入する工程と、
該コンクリート構造物の裏面と該裏面に接する被覆土壌の間に、前記止水剤を硬化させた止水膜を形成する工程と、を有する裏面注入止水工法において、
前記止水剤を注入する工程に用いる止水剤は、少なくとも水性ポリマー系分散液と硬化促進剤とを含み、該止水剤の比重は、1.03〜1.04であり、
前記止水膜を形成する工程が、前記注入孔の出口を中心として該裏面に沿うように、放射状に拡散して硬化させることを特徴とする裏面注入止水工法。
Providing an injection hole penetrating from the surface of the concrete structure toward the back surface;
Injecting a water-stopper into the injection hole;
In the back-side water-stopping construction method, comprising a step of forming a water-stopping film obtained by curing the water-stopping agent between the back surface of the concrete structure and the covered soil in contact with the back surface,
The water stopping agent used in the step of injecting the water stopping agent includes at least an aqueous polymer dispersion and a curing accelerator, and the specific gravity of the water stopping agent is 1.03 to 1.04.
The back surface injection water stop method is characterized in that the step of forming the water stop film diffuses and hardens radially along the back surface centering on the outlet of the injection hole.
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CN107957390A (en) * 2017-12-07 2018-04-24 北京林业大学 A kind of analogue measurement agricultural land soil surface crack influences preferentially to flow into the method oozed

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KR102265581B1 (en) * 2021-03-25 2021-06-16 컨텍이앤씨 주식회사 Filling Method for grouting into Rear cavity of Tunnel

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JPH09287161A (en) * 1996-04-23 1997-11-04 Mitsugi Ohata Water cutoff material
JP2002371135A (en) * 1998-10-16 2002-12-26 Sansei Kako Kk Method for producing aqueous dispersion
JP2002147198A (en) * 2000-11-15 2002-05-22 Sementetsukusu Corp:Kk Leakage preventing method for tunnel
JP2004059849A (en) * 2002-07-31 2004-02-26 Toa Doro Kogyo Co Ltd Two pack type water stop material composition
JP2009062779A (en) * 2007-09-07 2009-03-26 Ohbayashi Corp Water cut-off method and water cut-off structure for existing underground structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107957390A (en) * 2017-12-07 2018-04-24 北京林业大学 A kind of analogue measurement agricultural land soil surface crack influences preferentially to flow into the method oozed
CN107957390B (en) * 2017-12-07 2020-05-22 北京林业大学 Method for simulating and measuring influence of farmland soil surface cracks on preferential inflow infiltration

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