JPH04115061A - Crack repairing method of civil engineering/ architectural construction - Google Patents
Crack repairing method of civil engineering/ architectural constructionInfo
- Publication number
- JPH04115061A JPH04115061A JP23250690A JP23250690A JPH04115061A JP H04115061 A JPH04115061 A JP H04115061A JP 23250690 A JP23250690 A JP 23250690A JP 23250690 A JP23250690 A JP 23250690A JP H04115061 A JPH04115061 A JP H04115061A
- Authority
- JP
- Japan
- Prior art keywords
- water glass
- civil engineering
- cracks
- crack
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 13
- 238000010276 construction Methods 0.000 title abstract description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims description 16
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 abstract description 13
- 239000004814 polyurethane Substances 0.000 abstract description 13
- 238000002347 injection Methods 0.000 abstract description 7
- 239000007924 injection Substances 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 150000002334 glycols Chemical class 0.000 description 2
- 238000013008 moisture curing Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 229920006333 epoxy cement Polymers 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011414 polymer cement Substances 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Working Measures On Existing Buildindgs (AREA)
Abstract
Description
本発明は土木・建築構造物の亀裂を補修する方法に関し
、特に土木・建築構造物の乾燥状態の亀裂を補修する方
法に関する。The present invention relates to a method for repairing cracks in civil engineering/building structures, and particularly to a method for repairing dry cracks in civil engineering/building structures.
【従来の技術及び発明か解決しようとする課題】岩石、
コンクリート等の土木 建築構造物には、種々の原因に
より多数の亀裂（ひび割れ）が生じることがある。
これらの亀裂は土木 建築構造物の外観を悪くするばか
りでなく、雨水や塩分、その他の有害物質の侵入径路と
なり、その結果該構造物の寿命を短縮する。例えば、コ
ンクリート構造物中の鉄筋を腐食し、錆となってその体
積を膨張し腐食が更に一層進行するようになる。
その対策のため、亀裂部に硬化性材料（例えば、エポキ
シ樹脂やセメン）・ペースト）を注入し、固化するコン
クリ−１−構造物の亀裂の補修方法が広く採用されて来
た。
しかしなから、上記エポキシ樹脂を注入する方法は、亀
裂内部が湿潤状態であると樹脂の接着性が悪く、そのた
め充填補修後のコンクリ−１−構造物の強度が不十分に
なることがあった。
また、硬化には触媒の添加混きを必要とし、かつ硬化物
は硬質て脆ろく弾力性 柔軟性のないものであるため、
事後更にコンクリート構造物に変位応力が加わった場合
は、更に新たな亀裂が生じてしまうという欠点があった
。
そしてまた、セメントペーストを注入する方法は、接着
強度、硬化時間等の面で不十分なものがあった。
さらに、岩盤の亀裂箇所やコンクリート構造物の亀裂漏
水箇所に主に湿気硬化型ポリウレタンプレポリマーから
成る注入剤を止水剤として高圧力で注入し、水と反応さ
せて急速に硬化させ、ポリウレタンの発泡硬化体で岩盤
やコンクリート構造物の亀裂、間隙を埋めることにより
漏水を止める止水方法が、従来から実施されている。
この場合、湿気硬化型ポリウレタンプレポリマーは水と
反応して硬化し、その化学反応の過程で炭酸ガスを生成
して発泡及び体積が膨張し、その発泡圧力は拘束状態で
は５０ Ｋｇ７ｃｍ２以上にも達するため、この性質を
利用して、亀裂漏水箇所を止水するものである。
しかしながらこの方法は、ポリウレタンプレポリマーが
漏水と反応硬化することを利用しているのて、乾燥状態
の亀裂に対して該ポリウレタンプレポリマーを注入して
も発泡浸透することはない。
また、ポリウレタンプレポリマーに重合触媒を添加した
ものは、コンクリート構造物の亀裂表面には急速に硬化
体が形成されるが、コンクリート構造物の内部にまで進
入して残存する微細な亀裂はそのままに放置されている
。
以上のように従来の止水方法には、コンクリート構造物
自体の強度の回復や水密性の復元は十分に行なわれなか
っな。[Prior art and invention or problem to be solved] Rocks,
Many cracks may occur in civil engineering building structures such as concrete due to various causes. These cracks not only impair the appearance of civil engineering and building structures, but also serve as entry routes for rainwater, salt, and other harmful substances, thereby shortening the lifespan of the structures. For example, it corrodes the reinforcing bars in concrete structures, turns into rust and expands in volume, causing further corrosion. As a countermeasure against this problem, a method of repairing cracks in concrete structures has been widely adopted in which a curable material (for example, epoxy resin or cement paste) is injected into the crack and hardens. However, with the above-mentioned method of injecting epoxy resin, the adhesion of the resin is poor when the inside of the crack is wet, which may result in insufficient strength of the concrete structure after filling and repair. . In addition, curing requires the addition of a catalyst, and the cured product is hard, brittle, and inelastic.
If displacement stress is further applied to the concrete structure after the fact, new cracks may occur. Furthermore, some methods of injecting cement paste are insufficient in terms of adhesive strength, curing time, and the like. In addition, a filler made of moisture-curing polyurethane prepolymer is injected at high pressure into cracks in the bedrock and cracks and water leaks in concrete structures as a water sealing agent, causing it to react with water and rapidly harden. BACKGROUND ART Water stoppage methods have traditionally been used to stop water leakage by filling cracks and gaps in rock and concrete structures with hardened foam. In this case, the moisture-curing polyurethane prepolymer reacts with water and hardens, producing carbon dioxide gas during the chemical reaction, causing foaming and volume expansion, and the foaming pressure reaches over 50 kg7cm2 in a restrained state. Therefore, this property is used to stop water from cracks and water leaks. However, since this method utilizes the fact that polyurethane prepolymer hardens by reacting with water leakage, even if the polyurethane prepolymer is injected into cracks in a dry state, foaming and penetration will not occur. In addition, when polyurethane prepolymers are added with a polymerization catalyst, a hardened material is rapidly formed on the surface of cracks in concrete structures, but fine cracks that remain after penetrating into the interior of the concrete structure remain intact. It is abandoned. As mentioned above, conventional water stoppage methods do not sufficiently restore the strength or watertightness of the concrete structure itself.
本発明者は上記従来技術の欠点に鑑み、鋭意研究の結果
、コンクリート構造物の乾燥状態の亀裂を十分に補修で
きる方法を開発した。
すなわち、本発明は土木・建築構造物の乾燥亀裂部に、
水硬性−深型ポリウレタンプレボリマーと水ガラス水溶
液との混合物を充填することを特徴とする土木・建築の
亀裂補修方法である。
上記水硬性−深型ポリウレタンプレボリマーは、水に接
触するとそれと迅速に反応して炭酸ガスを生成して発泡
すると同時に架橋重合して硬化するものでアリ、ポリエ
ステルグリコール、ポリエーテルグリコール等のポリオ
ールと、末端にイソシアネート基を有する化合物とを反
応させた反応生成物であって、例えばエチレングリコー
ルにエチレンオキシドとプロピレンオキシドとを重きさ
せて得られる共重き体と、）・リレンジイソシアネート
との反応物である。
上記水ガラスは、無機接着剤として知られており、アル
カリ珪酸塩又はこれを主成分とした水溶液であり、アル
カリとしては主にナトリウであるが、ほかにカリウムも
ある。
市販の水ガラスとしては５．Ｔ Ｉ Ｓ １４０８規定
の「珪酸ソーダｎＮａｚｏ ｎ′１ｓｉ○２」があり
・１号、２号、３号、４号がある。
１〜４号品は粘稠な液体て、いわゆる水ガラスと呼ばれ
るもので、その組成は例えば３号品は、５ｉ０２が２８
〜３０％、Ｎａ２Ｏが９〜１０％、残部が水からなるも
ので、Ｎ ａ ２０ ： Ｓ ｉ、 ０２（モル比）−
１＋１０５である。
」１記本発明においては、水硬性−深型ポリウレタンプ
レボリマーと水ガラス水溶液との混合Ｍ量比は、１：１
〜４（ただし、水ガラス水溶液はＪＩＳＢ号相当品て算
出）であることが好ましく、さらに該混合物には、界面
活性剤を含有させることも好ましい。
コ・１−〜４の範囲より低い場合は、水硬性−深型ポリ
ウレタンプレボリマーの反応に必要な水量が確保てきす
、また該範囲を越える場合は、水硬性−深型ポリウレタ
ンプレボリマーと水ガラスとの反応が撹拌直後より開始
し、十分な可使時間が得られないこととなって、余り好
ましくない。In view of the above-mentioned drawbacks of the prior art, the inventors of the present invention have conducted intensive research and developed a method that can sufficiently repair dry cracks in concrete structures. That is, the present invention applies to dry cracks in civil engineering and architectural structures.
A method for repairing cracks in civil engineering and construction, characterized by filling a mixture of a hydraulic deep polyurethane prebolimer and an aqueous water glass solution. When the above-mentioned hydraulic deep polyurethane prebolimer comes into contact with water, it rapidly reacts with it to generate carbon dioxide gas, foams, and at the same time cross-links and polymerizes to harden, and is compatible with polyols such as polyols, polyester glycols, and polyether glycols. , is a reaction product obtained by reacting a compound having an isocyanate group at the end, such as a copolymer obtained by adding ethylene oxide and propylene oxide to ethylene glycol, and ) lylene diisocyanate. . The above-mentioned water glass is known as an inorganic adhesive, and is an alkali silicate or an aqueous solution containing this as a main component, and the alkali is mainly sodium, but potassium is also used. 5. As a commercially available water glass. There is "Sodium silicate nNazo n'1si○2" specified by TIS 1408. There are No. 1, No. 2, No. 3, and No. 4. Items 1 to 4 are viscous liquids called water glass, and their composition is, for example, item 3 has a 5i02 of 28
-30%, Na2O is 9-10%, and the balance is water, Na20: Si, 02 (molar ratio) -
It is 1+105. 1. In the present invention, the mixing ratio of the hydraulic deep polyurethane prebolymer and the water glass aqueous solution is 1:1.
-4 (however, the water glass aqueous solution is calculated based on JISB No. equivalent), and it is also preferable that the mixture contains a surfactant. If it is lower than the range of 1-4, it is necessary to ensure that the amount of water necessary for the reaction of the hydraulic deep polyurethane prepolymer is secured, and if it exceeds the range, the water The reaction with the glass starts immediately after stirring, making it impossible to obtain a sufficient pot life, which is not very preferable.
コンクリート構造物の乾燥亀裂部にボリウレタンブレボ
リマーと水ガラスの混合物が注入されると、ポリウレタ
ンプレポリマーは水ガラス中の水と徐々に接触反応して
、架橋重合して硬化する一方、水ガラスは無機質接着剤
となって亀裂部内でコンクリートと架橋重合ポリウレタ
ンを硬化接合する。
亀裂部内の硬化物は、ポリウレタン硬化物と水ガラス硬
化物の混合体であるため、ある程度の弾力性・柔軟性を
備え、その後の変位応力が加わってもさらに新たな亀裂
が生じることはない。When a mixture of polyurethane brebolymer and water glass is injected into the dry cracks of a concrete structure, the polyurethane prepolymer gradually reacts with the water in the water glass and hardens through cross-linking polymerization. The glass acts as an inorganic adhesive that hardens and bonds the concrete and cross-linked polyurethane within the crack. Since the cured material within the crack is a mixture of cured polyurethane and cured water glass, it has a certain degree of elasticity and flexibility, and even if subsequent displacement stress is applied, new cracks will not occur.
次に、本発明を実施例によって具体的に説明する。
まず、エチレングリコールにエチレンオキシドとプロピ
レンオキシドとを重合させて得られる共重合体と、トリ
レンジイソシアネートとの反応物であるポリウレタンプ
レポリマーを用意する。
これの市販品としてｒＮＬペースト」 （武田薬品工業
社製）を使用した。
また、水ガラスとしては、市販品のＪＩＳＢ号品を用意
した。
前記ポリウレタンプレポリマーと水ガラスとを、１：３
（重量比）で混合し、注入剤を調製した。
次に、コンクリート構造物のひび割れ開口部に対して、
本発明に係るポリウレタンプレポリマーと水ガラスの混
合物を注入する前に、注入口として適当な間隔で残すい
くつかの開口部を除き、他の開口部を有機系接着剤ある
いはポリマーセメントでシールする。
その後、前記列されたいくつかの注入口としての開口に
、ポリウレタンプレポリマーと水ガラスとの混合物を、
２〜５ ｋ ｇ ｆ ／ ｃ ｍ ２の圧力をかけて注
入する。
注入は、ひび割れが十分に充填された状態を確かめて終
了する。
注入された前記混合物は、ひび割れの内部に浸透して行
き、ひび割れ内において同時に水ガラス中の水とポリウ
レタンプレポリマーとの反応により、徐々に重合硬化し
、また水ガラスが接着剤となって硬化ポリウレタンとコ
ンクリート構造物とを接着した。
注入剤はひび割れの隅々まで浸透して行き、３１分後に
おいて、その体積膨張は２０倍、その圧縮強度は３ｋｇ
ｆ／ｃｒｎ２、接着強度は１５ｋｇｆ ／ ｃ ｍ ２
となった。Next, the present invention will be specifically explained using examples. First, a polyurethane prepolymer is prepared, which is a reaction product of a copolymer obtained by polymerizing ethylene glycol with ethylene oxide and propylene oxide, and tolylene diisocyanate. As a commercially available product, "rNL Paste" (manufactured by Takeda Pharmaceutical Company) was used. In addition, as the water glass, a commercially available JISB No. 1 product was prepared. The polyurethane prepolymer and water glass were mixed in a ratio of 1:3.
(weight ratio) to prepare an injection. Next, for crack openings in concrete structures,
Before injecting the mixture of polyurethane prepolymer and water glass according to the invention, some openings are left at suitable intervals as injection ports, and the other openings are sealed with organic adhesive or polymer cement. Then, the mixture of polyurethane prepolymer and water glass is added to the openings as several inlets in the row.
Inject under pressure of 2-5 kg f/cm2. The injection is completed after confirming that the crack is sufficiently filled. The injected mixture penetrates into the crack, and at the same time, the water in the water glass reacts with the polyurethane prepolymer, gradually polymerizing and hardening, and the water glass acts as an adhesive and hardens. The polyurethane and the concrete structure were glued together. The injection agent penetrates into every corner of the crack, and after 31 minutes, its volume expansion is 20 times and its compressive strength is 3 kg.
f/crn2, adhesive strength is 15kgf/cm2
It became.
上記のとおり、本発明によれば、土木・建築構造物の乾
燥亀裂に対して、注入剤を隅々まで浸透させることがで
き、ポリウレタンプレポリマーは水ガラス中の水と徐々
に接触反応して、架橋重合して硬化する一方、水ガラス
は無機質接着剤となって亀裂部内でコンクリートと架橋
重合ポリウレタンを硬化接合するため、強固な充填構造
物となる。
また、亀裂部内の充填硬化物は、ポリウレタン硬化物と
水ガラス硬化物の混合体であるため、ある程度の弾力性
・柔軟性を備え、その後の変位応力が加わってもさらに
新たな亀裂が生じない。As described above, according to the present invention, the injection agent can penetrate into every corner of dry cracks in civil engineering and architectural structures, and the polyurethane prepolymer gradually reacts with water in the water glass. , while the water glass cures through cross-linking polymerization, it becomes an inorganic adhesive that hardens and joins the concrete and cross-linked polyurethane within the cracks, resulting in a strong filling structure. In addition, since the cured material filled in the crack is a mixture of cured polyurethane and cured water glass, it has a certain degree of elasticity and flexibility, and even if subsequent displacement stress is applied, new cracks will not occur. .
Claims (3)
ポリウレタンプレポリマーと水ガラスとの混合物を充填
することを特徴とする土木・建築構造物の亀裂補修方法
。(1) A method for repairing cracks in civil engineering and building structures, which comprises filling dry cracks in civil engineering and building structures with a mixture of a hydraulic one-component polyurethane prepolymer and water glass.
スとの混合重量比が、１：１〜４（ただし、水ガラスは
ＪＩＳ３号相当品で算出）であることを特徴とする請求
項１記載の土木・建築構造物の亀裂補修方法。(2) Usability Claim 1 characterized in that the mixing weight ratio of the one-component polyurethane prepolymer and the water glass is 1:1 to 4 (however, the water glass is calculated using a product equivalent to JIS No. 3). How to repair cracks in civil engineering and building structures.
スとの混合物が、界面活性剤を含有するものであること
を特徴とする請求項１又は２記載の土木・建築構造物の
亀裂補修方法。(3) Usability The method for repairing cracks in civil engineering/building structures according to claim 1 or 2, wherein the mixture of the one-component polyurethane prepolymer and water glass contains a surfactant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23250690A JPH04115061A (en) | 1990-09-04 | 1990-09-04 | Crack repairing method of civil engineering/ architectural construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23250690A JPH04115061A (en) | 1990-09-04 | 1990-09-04 | Crack repairing method of civil engineering/ architectural construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04115061A true JPH04115061A (en) | 1992-04-15 |
Family
ID=16940399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23250690A Pending JPH04115061A (en) | 1990-09-04 | 1990-09-04 | Crack repairing method of civil engineering/ architectural construction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04115061A (en) |
-
1990
- 1990-09-04 JP JP23250690A patent/JPH04115061A/en active Pending
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