JP6372837B1 - Crack prevention agent for joints in concrete structures, construction method for concrete structures having joints, and tunnel construction method - Google Patents
Crack prevention agent for joints in concrete structures, construction method for concrete structures having joints, and tunnel construction method Download PDFInfo
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- 230000002265 prevention Effects 0.000 title claims abstract description 12
- 238000010276 construction Methods 0.000 title claims description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000011178 precast concrete Substances 0.000 claims abstract description 21
- 238000005336 cracking Methods 0.000 claims abstract description 11
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- URDCARMUOSMFFI-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(2-hydroxyethyl)amino]acetic acid Chemical compound OCCN(CC(O)=O)CCN(CC(O)=O)CC(O)=O URDCARMUOSMFFI-UHFFFAOYSA-N 0.000 description 1
- XNCSCQSQSGDGES-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]propyl-(carboxymethyl)amino]acetic acid Chemical compound OC(=O)CN(CC(O)=O)C(C)CN(CC(O)=O)CC(O)=O XNCSCQSQSGDGES-UHFFFAOYSA-N 0.000 description 1
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- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
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- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
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- 150000007513 acids Chemical class 0.000 description 1
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- 239000000853 adhesive Substances 0.000 description 1
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- AZSFNUJOCKMOGB-UHFFFAOYSA-N cyclotriphosphoric acid Chemical compound OP1(=O)OP(O)(=O)OP(O)(=O)O1 AZSFNUJOCKMOGB-UHFFFAOYSA-N 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-N diphosphoric acid Chemical compound OP(O)(=O)OP(O)(O)=O XPPKVPWEQAFLFU-UHFFFAOYSA-N 0.000 description 1
- 235000019820 disodium diphosphate Nutrition 0.000 description 1
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- MOTZDAYCYVMXPC-UHFFFAOYSA-N dodecyl hydrogen sulfate Chemical class CCCCCCCCCCCCOS(O)(=O)=O MOTZDAYCYVMXPC-UHFFFAOYSA-N 0.000 description 1
- ULHUCTVXHLHFHG-UHFFFAOYSA-N ethane-1,2-diamine;2-(2-hydroxyphenyl)acetic acid Chemical compound NCCN.OC(=O)CC1=CC=CC=C1O.OC(=O)CC1=CC=CC=C1O ULHUCTVXHLHFHG-UHFFFAOYSA-N 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
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- 238000007689 inspection Methods 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
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- 229910052749 magnesium Inorganic materials 0.000 description 1
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- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
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- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
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- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
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- 229920000137 polyphosphoric acid Polymers 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
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- 235000015424 sodium Nutrition 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
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- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical class CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-N triphosphoric acid Chemical compound OP(O)(=O)OP(O)(=O)OP(O)(O)=O UNXRWKVEANCORM-UHFFFAOYSA-N 0.000 description 1
- 229940048102 triphosphoric acid Drugs 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Building Environments (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
【課題】打継目地に沿ったひび割れの発生を防止すると共に、そのための作業の施工性を高め、その作業時間を短縮することができる、コンクリート構造物の打継目地のひび割れ防止剤、打継目地を有するコンクリート構造物の施工方法、およびトンネルの施工方法を提供する。
【解決手段】コンクリート構造物の打継目地のひび割れ防止剤は、４０乃至７７重量％の脂肪酸含有化合物と、２乃至５重量％の安定化剤と、１乃至３重量％の界面活性剤と、１５乃至５２重量％のイオン交換水とを含む。先打ちコンクリートを打設した後、その先打ちコンクリートの打継面に、コンクリート構造物の打継目地のひび割れ防止剤を塗布し、ひび割れ防止剤を塗布した打継面に接するよう後打ちコンクリートを打設する。
【選択図】図１
[PROBLEMS] To prevent the occurrence of cracks along the joint, and to improve the workability of the work and shorten the work time. A method for constructing a concrete structure having a ground and a method for constructing a tunnel are provided.
An anti-cracking agent for a joint joint of a concrete structure includes 40 to 77% by weight of a fatty acid-containing compound, 2 to 5% by weight of a stabilizer, and 1 to 3% by weight of a surfactant. 15 to 52% by weight of ion exchange water. After placing the precast concrete, apply the crack prevention agent for the joint joint of the concrete structure to the joint surface of the precast concrete, and place the postcast concrete so that it touches the joint surface to which the crack prevention agent has been applied. To cast.
[Selection] Figure 1
Description
本発明は、コンクリート構造物の打継目地のひび割れ防止剤、打継目地を有するコンクリート構造物の施工方法、およびトンネルの施工方法に関する。 The present invention relates to a crack preventing agent for a joint joint of a concrete structure, a construction method for a concrete structure having a joint joint, and a tunnel construction method.
従来、トンネルなどのコンクリート構造物の施工方法として、型枠の設置、コンクリートの打設、型枠の移動・解体を繰り返して構築していく方法が広く行われている。この施工方法によれば、先打ちコンクリートを打設し、所定時間経過後に、後打ちコンクリートを打設するため、コンクリートの継ぎ目に打継目地が形成される。しかし、この施工方法では、コンクリートの温度や乾燥収縮による体積変化により、先打ちコンクリートと後打ちコンクリートとが互いに離れる方向に変形するため、先打ちコンクリートと後打ちコンクリートとが付着していると、打継目地に沿った先打ちコンクリート側の弱点部に沿ってひび割れが発生し、うきやはく離も発生しやすくなるという問題があった（例えば、非特許文献１または２参照）。 2. Description of the Related Art Conventionally, as a construction method for a concrete structure such as a tunnel, a method of repeatedly constructing by installing a formwork, placing concrete, moving and dismantling the formwork has been widely performed. According to this construction method, the cast-in concrete is cast, and the post-cast concrete is cast after a lapse of a predetermined time. Therefore, a joint joint is formed at the joint of the concrete. However, in this construction method, due to the volume change due to the concrete temperature and drying shrinkage, the precast concrete and the postcast concrete are deformed in a direction away from each other. There has been a problem that cracks are generated along the weak spot portion on the side of the precast concrete along the joint, and cracking and peeling are likely to occur (see, for example, Non-Patent Document 1 or 2).
そこで、打継目地に沿ったひび割れの発生を防ぐために、先打ちコンクリートを打設後、その打継面にビニールシートを設置し、そのビニールシートを介して後打ちコンクリートを打設する方法が推奨されている（例えば、非特許文献２参照）。また、先打ちコンクリートの打継面に加熱接着シートを設置し、そのシートを介して後打ちコンクリートを打設し、熱的収縮の期間が経過した後、加熱接着シートを加熱して先打ちコンクリートと後打ちコンクリートとを一体化する方法も開発されている（例えば、特許文献１参照）。 Therefore, in order to prevent the occurrence of cracks along the joints, it is recommended that after placing the pre-cast concrete, a vinyl sheet is placed on the joint surface and the post-cast concrete is placed through the vinyl sheet. (For example, see Non-Patent Document 2). Also, a heat-adhesive sheet is installed on the joint surface of the pre-cast concrete, the post-cast concrete is placed through the sheet, and after the period of thermal shrinkage, the heat-bonded sheet is heated to pre-cast the concrete. A method has also been developed in which post-cast concrete is integrated (see, for example, Patent Document 1).
非特許文献２および特許文献１に記載の施工方法によれば、打継面に配置されたシートにより、先打ちコンクリートと後打ちコンクリートとの縁切りを行い、打継目地に沿ったひび割れの発生を防ぐことはできるが、打継面からはみ出したシートを切り取らなければならず、その切取作業が煩雑で労力を要し、作業時間もかかるという課題があった。 According to the construction method described in Non-Patent Document 2 and Patent Document 1, edge cutting between precast concrete and postcast concrete is performed by a sheet arranged on the joint surface, and cracks are generated along the joint joint. Although this can be prevented, there is a problem that the sheet protruding from the joining surface has to be cut off, and the cutting work is complicated and labor-intensive, and takes a long time.
本発明は、このような課題に着目してなされたもので、打継目地に沿ったひび割れの発生を防止すると共に、そのための作業の施工性を高め、その作業時間を短縮することができる、コンクリート構造物の打継目地のひび割れ防止剤、打継目地を有するコンクリート構造物の施工方法、およびトンネルの施工方法を提供することを目的とする。 The present invention has been made paying attention to such problems, while preventing the occurrence of cracks along the joint joints, improving the workability of the work for it, and shortening the work time, An object of the present invention is to provide a crack preventing agent for joints in concrete structures, a method for constructing concrete structures having joints, and a method for constructing tunnels.
上記目的を達成するために、本発明に係るコンクリート構造物の打継目地のひび割れ防止剤は、４０乃至７７重量％の脂肪酸含有化合物と、２乃至５重量％の安定化剤と、１乃至３重量％の界面活性剤と、１５乃至５２重量％の水とを含むことを特徴とする。 In order to achieve the above object, the crack preventing agent for joints in concrete structures according to the present invention comprises 40 to 77 wt% fatty acid-containing compound, 2 to 5 wt% stabilizer, 1 to 3 It is characterized in that it contains 1% by weight surfactant and 15-52% by weight water.
本発明に係る打継目地を有するコンクリート構造物の施工方法は、先打ちコンクリートを打設した後、前記先打ちコンクリートの打継面に、本発明に係るコンクリート構造物の打継目地のひび割れ防止剤を塗布し、前記ひび割れ防止剤を塗布した前記打継面に接するよう後打ちコンクリートを打設することを特徴とする。 The method for constructing a concrete structure having a joint according to the present invention is to prevent cracking of the joint joint of the concrete structure according to the present invention on the joint surface of the precast concrete after placing the precast concrete. A post-cast concrete is placed so as to be in contact with the joint surface to which the agent is applied and the crack preventing agent is applied.
本発明に係るコンクリート構造物の打継目地のひび割れ防止剤は、本発明に係る打継目地を有するコンクリート構造物の施工方法で好適に使用される。本発明に係る打継目地を有するコンクリート構造物の施工方法によれば、本発明に係るコンクリート構造物の打継目地のひび割れ防止剤を、先打ちコンクリートの打継面に塗布することにより、その打継面に接するよう打設された後打ちコンクリートと、先打ちコンクリートとの縁切りを行うことができる。これにより、乾燥収縮等による積変化により先打ちコンクリートや後打ちコンクリートが変形しても、打継目地に沿ってひび割れが発生するのを防止することができる。
本発明において使用する水は、イオン交換水が好ましい。本発明に係るコンクリート構造物の打継目地のひび割れ防止剤は、触媒を含んでいてもよい。
The crack preventing agent for a joint joint of a concrete structure according to the present invention is suitably used in the method for constructing a concrete structure having a joint joint according to the present invention. According to the method for constructing a concrete structure having joints according to the present invention, the crack prevention agent for the joint joints of the concrete structure according to the present invention is applied to the joint surface of the precast concrete. It is possible to perform edge cutting between post-cast concrete placed in contact with the joint surface and the pre-cast concrete. Thereby, even if the pre-cast concrete or the post-cast concrete is deformed due to a product change due to drying shrinkage or the like, it is possible to prevent cracks from occurring along the joint joint.
The water used in the present invention is preferably ion exchange water. The crack preventing agent for joints in a concrete structure according to the present invention may contain a catalyst.
また、本発明に係る打継目地を有するコンクリート構造物の施工方法によれば、本発明に係るコンクリート構造物の打継目地のひび割れ防止剤を、先打ちコンクリートの打継面に塗布するだけで、打継目地に沿ったひび割れを防止することができ、施工性がよい。また、打継面にシートを設置する方法と比べ、煩雑で労力を要するシートの切り取り作業が発生しないため、ひび割れ防止のための作業の施工性を高めることができ、その作業時間を短縮することもできる。 Moreover, according to the construction method of the concrete structure having the joint according to the present invention, the crack preventing agent for the joint joint of the concrete structure according to the present invention is simply applied to the joint surface of the precast concrete. Can prevent cracks along the joints and has good workability. In addition, compared to the method of installing a sheet on the connecting surface, a troublesome and labor-intensive sheet cutting operation does not occur, so the workability for preventing cracks can be improved and the work time can be shortened. You can also.
本発明に係る打継目地を有するコンクリート構造物の施工方法は、打設した前記先打ちコンクリートの前記打継面が乾燥した後、前記打継面に前記ひび割れ防止剤を塗布することが好ましい。この場合、本発明に係るコンクリート構造物の打継目地のひび割れ防止剤を塗布しやすい。また、先打ちコンクリートと後打ちコンクリートとを確実に縁切りすることができ、ひび割れ防止効果を高めることができる。 In the method for constructing a concrete structure having joints according to the present invention, it is preferable that the crack preventing agent is applied to the joint surface after the joint surface of the cast-in-place concrete has dried. In this case, it is easy to apply the crack preventing agent for the joint joint of the concrete structure according to the present invention. Further, the precast concrete and the postcast concrete can be surely cut off, and the crack prevention effect can be enhanced.
本発明に係る打継目地を有するコンクリート構造物の施工方法は、前記ひび割れ防止剤を塗布した後、前記打継面が湿潤状態で前記後打ちコンクリートを打設することが好ましい。この場合、先打ちコンクリートと後打ちコンクリートとを確実に縁切りすることができ、ひび割れ防止効果を高めることができる。 In the method for constructing a concrete structure having joints according to the present invention, it is preferable to place the post-cast concrete with the joint surface wet after applying the crack preventing agent. In this case, the precast concrete and the postcast concrete can be surely cut off, and the crack prevention effect can be enhanced.
本発明に係るトンネルの施工方法は、本発明に係る打継目地を有するコンクリート構造物の施工方法を利用したトンネルの施工方法であって、前記先打ちコンクリートおよび前記後打ちコンクリートが、隣り合って打設されるトンネル覆工コンクリートであることを特徴とする。 A tunnel construction method according to the present invention is a tunnel construction method using a concrete structure construction method having joints according to the present invention, wherein the precast concrete and the postcast concrete are adjacent to each other. It is a tunnel lining concrete to be cast.
本発明に係るトンネルの施工方法は、本発明に係る打継目地を有するコンクリート構造物の施工方法を利用するため、トンネル覆工コンクリートの打継目地に沿ってひび割れが発生するのを防止することができる。また、ひび割れ防止のための作業の施工性が高く、その作業時間を短縮することもできる。なお、本発明に係る打継目地を有するコンクリート構造物の施工方法は、トンネルの施工に限らず、橋梁地覆、砂防堰堤、防潮堤防、ケーソン工の施工など、打継目地が発生するものであればいかなるコンクリート構造物の施工にも利用することができる。 Since the tunnel construction method according to the present invention uses the concrete structure construction method having the joint according to the present invention, it is possible to prevent the occurrence of cracks along the joint of the tunnel lining concrete. Can do. Moreover, the workability for work for preventing cracks is high, and the work time can be shortened. In addition, the construction method of a concrete structure having a joint joint according to the present invention is not limited to a tunnel construction, but a joint joint is generated such as a bridge ground cover, a sabo dam, a seawall, a caisson construction. It can be used for the construction of any concrete structure.
本発明によれば、打継目地に沿ったひび割れの発生を防止すると共に、そのための作業の施工性を高め、その作業時間を短縮することができる、コンクリート構造物の打継目地のひび割れ防止剤、打継目地を有するコンクリート構造物の施工方法、およびトンネルの施工方法を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, while preventing the generation | occurrence | production of the crack along a joining joint, the workability | operativity of the operation | work for that can be improved, and the work time can be shortened, The crack prevention agent of the joining joint of a concrete structure The construction method of the concrete structure which has a joint joint, and the construction method of a tunnel can be provided.
以下、本発明の実施の形態について説明する。
本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤（以下、「ひび割れ防止剤」とも記載する）は、４０乃至７７重量％の脂肪酸含有化合物と、２乃至５重量％の安定化剤と、１乃至３重量％の界面活性剤と、１５乃至５２重量％の水とを含んでいる。
Embodiments of the present invention will be described below.
The crack preventing agent (hereinafter also referred to as “crack preventing agent”) of the joint joint of the concrete structure according to the embodiment of the present invention is composed of 40 to 77 wt% fatty acid-containing compound and 2 to 5 wt% stable. Containing 1 to 3% by weight of a surfactant and 15 to 52% by weight of water.
脂肪酸含有化合物は、脂肪酸又はその金属塩を含有するものが好ましい。脂肪酸としては、例えば炭素原子数が１２〜２８である脂肪酸が用いられる。このような脂肪酸としては、例えばラウリン酸、ミリスチン酸、ダイマー酸、パルミチン酸、ステアリン酸、オレイン酸、リノール酸、アラキドン酸、ベヘン酸及びモンタン酸が挙げられる。脂肪酸の金属塩を構成する金属としては、マグネシウム、カルシウム、亜鉛、鉛などが挙げられる。 The fatty acid-containing compound preferably contains a fatty acid or a metal salt thereof. As the fatty acid, for example, a fatty acid having 12 to 28 carbon atoms is used. Examples of such fatty acids include lauric acid, myristic acid, dimer acid, palmitic acid, stearic acid, oleic acid, linoleic acid, arachidonic acid, behenic acid and montanic acid. Examples of the metal constituting the fatty acid metal salt include magnesium, calcium, zinc, lead and the like.
安定化剤としては、エチレンジアミン四酢酸、ニトリロトリ酢酸、ジエチレントリアミン五酢酸、ヒドロキシエチルエチレンジアミン三酢酸、プロピレンジアミン四酢酸、ビス（２−ヒドロキシフェニル酢酸）エチレンジアミン、トリエタノールアミン及びこれらの塩類、脂肪族オキシカルボン酸、縮合リン酸塩等が挙げられる。脂肪族オキシカルボン酸としては、酒石酸、クエン酸、コハク酸、グルコン酸、ジヒドロキシエチルグリシン等が挙げられる。縮合リン酸塩としては、ピロリン酸、トリリン酸、トリメタリン酸、テトラメタリン酸等のポリリン酸の塩が挙げられ、具体的にはピロリン酸ナトリウム、酸性ピロリン酸ナトリウム、トリポリリン酸ナトリウム、テトラポリリン酸ナトリウム、ヘキサメタリン酸ナトリウム、酸性ヘキサメタリン酸ナトリウム又はこれらのカリウム塩等が挙げられる。 Stabilizers include ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentaacetic acid, hydroxyethylethylenediaminetriacetic acid, propylenediaminetetraacetic acid, bis (2-hydroxyphenylacetic acid) ethylenediamine, triethanolamine and their salts, aliphatic oxycarboxylic Examples include acids and condensed phosphates. Examples of the aliphatic oxycarboxylic acid include tartaric acid, citric acid, succinic acid, gluconic acid, dihydroxyethylglycine and the like. Examples of the condensed phosphate include salts of polyphosphoric acid such as pyrophosphoric acid, triphosphoric acid, trimetaphosphoric acid, and tetrametaphosphoric acid. Specifically, sodium pyrophosphate, sodium acid pyrophosphate, sodium tripolyphosphate, sodium tetrapolyphosphate , Sodium hexametaphosphate, sodium acid hexametaphosphate or potassium salts thereof.
界面活性剤としては、ラウリルサルフェート塩、アルキルベンゼンスルホン酸塩、ジアルキルスルホコハク酸塩、ポリオキシエチレンアルキルエーテル硫酸塩、無水マレイン酸共重合物塩等のアニオン性界面活性剤、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェノールエーテル、ポリオキシエチレン・スチレン化フェノールエーテル、ポリオキシアルキルエーテル硫酸ナトリウム、ポリオキシエチレントリベンジル化オルソフェニルフェノールエーテル、ポリオキシエチレンポリオキシプロピレンオクチルフェノールエーテル、ポリオキシエチレンアルキルアミン等のノニオン性界面活性剤、アルキルトリメチルアンモニウムクロライド、アルキルベンジルジメチルアンモニウムクロライド、アルキルアミンアセテート等のカチオン性界面活性剤及びココナットベタイン等の両性界面活性剤等が挙げられる。
水としては、イオン交換水が好ましい。
また、その他、種々の添加材を含んでいてもよい。
Surfactants include anionic surfactants such as lauryl sulfate salts, alkylbenzene sulfonates, dialkylsulfosuccinates, polyoxyethylene alkyl ether sulfates, maleic anhydride copolymer salts, polyoxyethylene alkyl ethers, polyoxyethylene alkyl ethers, and polyoxyethylene alkyl ethers. Nonionic properties such as oxyethylene alkylphenol ether, polyoxyethylene / styrenated phenol ether, sodium polyoxyalkyl ether sulfate, polyoxyethylene tribenzylated orthophenylphenol ether, polyoxyethylene polyoxypropylene octylphenol ether, polyoxyethylene alkylamine, etc. Surfactant, alkyltrimethylammonium chloride, alkylbenzyldimethylammonium chloride, alkylamine acetate Over amphoteric surfactants such as cationic surfactants and coconut betaine such bets it can be mentioned.
As water, ion-exchanged water is preferable.
In addition, various additives may be included.
本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤は、乳白色で水溶性であり、２０℃での比重が０．９〜１．０ｇ／ｍＬ、２０℃での粘度が１００〜１３５ｍＰａ・ｓ、引火点が２００℃である。また、−３℃でも凍結しない。 The crack preventing agent for joints in concrete structures according to an embodiment of the present invention is milky white and water-soluble, has a specific gravity of 0.9 to 1.0 g / mL at 20 ° C, and a viscosity at 20 ° C of 100. ˜135 mPa · s, flash point is 200 ° C. Moreover, it does not freeze even at -3 ° C.
本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤は、本発明の実施の形態の打継目地を有するコンクリート構造物の施工方法で好適に使用される。すなわち、本発明の実施の形態の打継目地を有するコンクリート構造物の施工方法は、まず、先打ちコンクリートを打設し、その先打ちコンクリートの打継面が、所要時間の乾燥養生を経た後、その打継面に、本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤を塗布する。このとき、打継面が乾燥しているため、ひび割れ防止剤を塗布しやすい。塗布量は、２００〜３００ｇ／ｍ２が好ましい。 The crack preventing agent for the joint joint of the concrete structure according to the embodiment of the present invention is suitably used in the method for constructing a concrete structure having the joint joint according to the embodiment of the present invention. That is, in the method for constructing a concrete structure having a joint joint according to the embodiment of the present invention, firstly, cast-in concrete is placed, and the joint surface of the cast-in concrete is subjected to drying curing for a required time. The cracking preventive agent for the joint joint of the concrete structure according to the embodiment of the present invention is applied to the joint surface. At this time, since the joint surface is dry, it is easy to apply the crack preventing agent. The coating amount is preferably 200 to 300 g / m 2 .
次に、そのひび割れ防止剤を塗布した打継面が乾く前の湿潤状態で、その打継面に接するよう後打ちコンクリートを打設する。ひび割れ防止剤を塗布した打継面は、ひび割れ防止剤の配合等の条件を整えることにより、塗布後７２時間程度は湿潤状態を保つようにすることができるため、７２時間以内に後打ちコンクリートを打設することが好ましい。これにより、先打ちコンクリートと後打ちコンクリートとの縁切りを確実に行うことができる。また、乾燥収縮等による積変化により先打ちコンクリートや後打ちコンクリートが変形しても、打継目地に沿ってひび割れが発生するのを防止することができる。また、ひび割れを原因とする、うきやはく離の発生も防ぐことができる。 Next, post-cast concrete is placed so as to be in contact with the joint surface in a wet state before the joint surface to which the crack preventing agent is applied is dried. The joint surface to which the anti-cracking agent has been applied can be kept moist for about 72 hours after application by adjusting conditions such as the composition of the anti-cracking agent. It is preferable to cast. Thereby, the edge cutting of pre-cast concrete and post-cast concrete can be performed reliably. Moreover, even if the pre-cast concrete or the post-cast concrete is deformed by a product change due to drying shrinkage or the like, it is possible to prevent cracks from occurring along the joint joint. In addition, it is possible to prevent the occurrence of peeling and peeling due to cracks.
このように、本発明の実施の形態の打継目地を有するコンクリート構造物の施工方法によれば、本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤を、先打ちコンクリートの打継面に塗布するだけで、打継目地に沿ったひび割れを防止することができ、施工性がよい。また、打継面にシートを設置する方法と比べ、煩雑で労力を要するシートの切り取り作業が発生しないため、ひび割れ防止のための作業の施工性を高めることができ、その作業時間を短縮することもできる。 As described above, according to the method for constructing a concrete structure having a joint according to the embodiment of the present invention, the crack preventing agent for the joint joint of the concrete structure according to the embodiment of the present invention is used. By simply applying to the joint surface, it is possible to prevent cracking along the joint, and the workability is good. In addition, compared to the method of installing a sheet on the connecting surface, a troublesome and labor-intensive sheet cutting operation does not occur, so the workability for preventing cracks can be improved and the work time can be shortened. You can also.
本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤は、コンクリー構造物の規模や、打継面の形状によらず、容易に施工することができ、ひび割れの発生を防止することができる。また、本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤は、打継面に塗布してから７２時間程度、湿潤状態を保つようにすることができるため、先打ちコンクリートの養生時間を十分に確保することができる。 The crack preventing agent for the joint joint of the concrete structure according to the embodiment of the present invention can be easily applied regardless of the size of the concrete structure and the shape of the joint surface, and prevents the occurrence of cracks. be able to. In addition, since the crack preventing agent for the joint joint of the concrete structure according to the embodiment of the present invention can be kept wet for about 72 hours after being applied to the joint surface, Sufficient curing time can be secured.
本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤は、例えば、トンネルの施工にも使用することができ、トンネル覆工コンクリートの打継目地に沿ってひび割れが発生するのを防止することができる。また、トンネルの施工に限らず、橋梁地覆、砂防堰堤、防潮堤防、ケーソン工の施工などのコンクリート構造物の施工にも利用することができる。 The crack preventing agent for the joint joint of the concrete structure according to the embodiment of the present invention can be used for, for example, tunnel construction, and cracks are generated along the joint joint of the tunnel lining concrete. Can be prevented. Moreover, it can be used not only for construction of tunnels but also for construction of concrete structures such as bridge cover, sabo dam, tide embankment, caisson construction.
［縁切り性能（剥離性能）の確認試験］
本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤の、縁切り性能（剥離性能）を確認するための試験を行った。試験は、ＪＩＳ Ａ １１１３（コンクリートの割裂引張強度試験方法）に準じて行った。試験に使用したひび割れ防止剤は、脂肪酸含有化合物としてダイマー酸を４０乃至７７重量％、安定化剤としてトリエタノールアミンを２乃至５重量％、界面活性剤としてポリオキシアルキルエーテル硫酸ナトリウムを１乃至３重量％、イオン交換水を１５乃至５２重量％含むものである。
[Verification test of edge cutting performance (peeling performance)]
The test for confirming the edge cutting performance (peeling performance) of the crack preventing agent for the joint joint of the concrete structure according to the embodiment of the present invention was performed. The test was conducted in accordance with JIS A 1113 (a method for testing the split tensile strength of concrete). The crack inhibitor used in the test was 40 to 77% by weight of dimer acid as a fatty acid-containing compound, 2 to 5% by weight of triethanolamine as a stabilizer, and 1 to 3 sodium polyoxyalkyl ether sulfate as a surfactant. It contains 15 to 52% by weight of ion exchange water.
試験では、直径１００ｍｍ、高さ１５０ｍｍの円柱状のコンクリート製の基台（先打ちコンクリートに該当）の上端面にひび割れ防止剤を塗布し、その上に、直径７５ｍｍ、高さ１００ｍｍの円柱状の後打ちコンクリートを打設した。このとき、基台および後打ちコンクリートの端面同士が付着するよう打設を行った。２時間養生した後、後打ちコンクリートを１０Ｎの引張力で上方に引っ張り、付着強度を測定した。 In the test, an anticracking agent was applied to the upper end surface of a columnar concrete base (corresponding to pre-cast concrete) having a diameter of 100 mm and a height of 150 mm, and a columnar shape having a diameter of 75 mm and a height of 100 mm was applied thereon. Post-cast concrete was laid. At this time, placement was performed so that the end surfaces of the base and the post-cast concrete were adhered to each other. After curing for 2 hours, the post-cast concrete was pulled upward with a tensile force of 10 N, and the adhesion strength was measured.
また、比較のため、コンクリート製の基台の上端面に、本発明の実施の形態のコンクリート構造物の打継目地のひび割れ防止剤を塗布せず、そのまま後打ちコンクリートを打設したもの（以下、「無処理」という）についても、同様に付着強度を測定した。このときの引張力は、１９６Ｎとした。試験結果を、表１に示す。 In addition, for comparison, the concrete base of the embodiment of the present invention is not coated with the cracking inhibitor for the joint joint of the concrete structure according to the embodiment of the present invention, and the post-cast concrete is cast as it is (hereinafter referred to as the concrete base). The adhesion strength was also measured in the same manner. The tensile force at this time was 196N. The test results are shown in Table 1.
表１に示すように、ひび割れ防止剤を塗布したものは、無処理のものと比べて、付着強度が１／１０であり、基台と後打ちコンクリートとの界面がほぼ１００％縁切りされていることが確認された。 As shown in Table 1, the one to which the crack preventing agent is applied has an adhesion strength of 1/10 compared to the untreated one, and the interface between the base and the post-cast concrete is almost 100% cut off. It was confirmed.
次に、実際のコンクリート構造物に対して、打継面にひび割れ防止剤を塗布して施工を行ったものと、打継面にひび割れ防止剤を塗布せず無処理で施工を行ったものとを観察した結果を、図１に示す。図１（ａ）に示すように、無処理のものは、打継目地に沿ってひび割れが発生しているのが確認された。これに対し、図１（ｂ）に示すように、ひび割れ防止剤を塗布したものは、ひび割れが発生していないことが確認された。これは、ひび割れ防止剤により、先打ちコンクリートと後打ちコンクリートとが縁切りされていたためであると考えられる。
Next, the actual concrete structure was constructed with the cracking agent applied to the joining surface, and the construction was performed without treatment without applying the cracking agent to the joining surface. The results of observation are shown in FIG. As shown to Fig.1 (a), it was confirmed that the non-processed thing has generate | occur | produced the crack along the joint joint. On the other hand, as shown in FIG. 1 (b), it was confirmed that no crack was generated in the case where the crack inhibitor was applied. This is thought to be because the precast concrete and the postcast concrete were cut off by the crack preventing agent.
Claims (5)
前記先打ちコンクリートおよび前記後打ちコンクリートが、隣り合って打設されるトンネル覆工コンクリートであることを
特徴とするトンネルの施工方法。
A tunnel construction method using a concrete structure construction method having a joint joint according to any one of claims 2 to 4,
A tunnel construction method, wherein the precast concrete and the postcast concrete are tunnel lining concrete that is placed next to each other.
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