JP6979825B2 - How to repair concrete members - Google Patents
How to repair concrete members Download PDFInfo
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- JP6979825B2 JP6979825B2 JP2017149380A JP2017149380A JP6979825B2 JP 6979825 B2 JP6979825 B2 JP 6979825B2 JP 2017149380 A JP2017149380 A JP 2017149380A JP 2017149380 A JP2017149380 A JP 2017149380A JP 6979825 B2 JP6979825 B2 JP 6979825B2
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- Prior art keywords
- crack
- concrete member
- precast concrete
- repair material
- repair
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- 239000004567 concrete Substances 0.000 title claims description 15
- 239000000463 material Substances 0.000 claims description 20
- 239000011178 precast concrete Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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- Working Measures On Existing Buildindgs (AREA)
Description
本発明は、コンクリート部材の補修方法に関するものである。 The present invention relates to a method for repairing a concrete member.
従来、コンクリート部材に、その外側に開口するクラックが生じた場合には、そのクラック内にエポキシ系の補修材を注入して補修することが行われている。 Conventionally, when a crack that opens to the outside of a concrete member is generated, an epoxy-based repair material is injected into the crack to repair the concrete member.
しかし、コンクリート部材に生じたクラックの幅が０．１ｍｍ以下の場合には、クラック内に補修材を注入することが困難であり、生じたクラックを補修する方法がなかった。 However, when the width of the crack generated in the concrete member is 0.1 mm or less, it is difficult to inject the repair material into the crack, and there is no method for repairing the generated crack.
そこで、本発明は、クラックの幅が０．１ｍｍ以下の場合でも補修することができるコンクリート部材の補修方法を提供することを目的とするものである。 Therefore, an object of the present invention is to provide a method for repairing a concrete member that can be repaired even when the width of a crack is 0.1 mm or less.
前記の課題を解決するために、請求項１記載の発明は、 プレキャストコンクリート部材の全体を、所定温度以上となるように加熱し、クラックの開口側におけるコンクリート部材の表面に、クラックの開口部が閉塞するように補修材を塗布した後に、前記プレキャストコンクリート部材を冷却することを特徴とするものである。 In order to solve the above-mentioned problems, in the invention according to claim 1 , the entire precast concrete member is heated to a predetermined temperature or higher, and a crack opening is formed on the surface of the concrete member on the crack opening side. It is characterized in that the precast concrete member is cooled after the repair material is applied so as to be closed.
本発明は、コンクリート部材における少なくともクラック部分を、その奥部までを所定温度以上となるように加熱し、クラックの開口側におけるコンクリート部材の表面に、クラックの開口部が閉塞するように補修材を塗布した後に、少なくともクラック部分を冷却することで、クラック内で圧力変化が生じ、クラックの開口部を閉塞するように塗布した補修材をクラックの奥部まで浸透させることができる。 In the present invention, at least the crack portion of the concrete member is heated to a predetermined temperature or higher up to the inner portion thereof, and a repair material is provided on the surface of the concrete member on the crack opening side so that the crack opening is closed. By cooling at least the crack portion after coating, a pressure change occurs in the crack, and the repair material applied so as to close the opening of the crack can be infiltrated to the inner part of the crack.
このように、クラック内の圧力変化を利用してクラックを補修するため、クラックの幅が０．１ｍｍ以下の場合においても、補修材をクラック内に浸透させることができ、クラックを効果的に補修することができる。 In this way, since the crack is repaired by utilizing the pressure change in the crack, the repair material can be infiltrated into the crack even when the width of the crack is 0.1 mm or less, and the crack can be effectively repaired. can do.
本発明を実施するための形態を説明する。 A mode for carrying out the present invention will be described.
プレキャストコンクリート部材の製造において、プレキャストコンクリート部材の表面側（外側）に開口するクラックが生じた場合には、このプレキャストコンクリート部材を、その全体が収納できる加熱用の窯などに収納して、所定の温度以上となるまで上昇させる。この所定の温度は、任意の温度に設定することができるが、本実施例においては外気温＋３０℃とした。なお、プレキャストコンクリート部材全体を加熱する手段としては、釜以外にも、蒸気による加熱など任意の加熱手段を用いて行うことができる。 In the manufacture of precast concrete members, if cracks that open on the surface side (outside) of the precast concrete members occur, the precast concrete members are stored in a heating kiln or the like that can accommodate the entire precast concrete member, and a predetermined value is given. Raise until above temperature. This predetermined temperature can be set to any temperature, but in this embodiment, the outside air temperature is + 30 ° C. As a means for heating the entire precast concrete member, any heating means such as heating with steam can be used in addition to the kettle.
次に、クラックの開口部と、プレキャストコンクリート部材におけるクラック周辺の表面部分に補修材を適量塗布し、クラックの開口部を補修材により閉塞する。用いる補修材は、コンクリート部材のクラックの補修に用いられるものであれば任意のものを用いることができるが、オープンタイムが長いものが好ましく、また、補修材に粉体が用いられている場合には、その粒径は０．１ｍｍ未満であることが好ましい。 Next, an appropriate amount of a repair material is applied to the crack opening and the surface portion around the crack in the precast concrete member, and the crack opening is closed by the repair material. As the repair material to be used, any material can be used as long as it is used for repairing cracks in concrete members, but a material having a long open time is preferable, and when powder is used as the repair material. The particle size is preferably less than 0.1 mm.
次に、プレキャストコンクリート部材を窯から取り出して、自然冷却により、プレキャストコンクリート部材が、外気温となるまで放置して自然冷却する。なお、冷却温度は、外気温以外にも任意に設定することができる。また、プレキャストコンクリート部材を、任意の冷却方法を用いて冷却するようにしてもよい。なお、プレキャストコンクリート部材を、その表面に補修材を塗布することなく窯から取り出し、プレキャストコンクリート部材が所定温度以下となる前に、上記のように補修材を塗布するようにしてもよい。 Next, the precast concrete member is taken out from the kiln and naturally cooled by leaving the precast concrete member to stand until the outside air temperature is reached. The cooling temperature can be arbitrarily set in addition to the outside air temperature. Further, the precast concrete member may be cooled by using an arbitrary cooling method. The precast concrete member may be taken out of the kiln without applying the repair material to the surface thereof, and the repair material may be applied as described above before the precast concrete member reaches a predetermined temperature or lower.
この冷却により、クラック内部の圧力が減少し、補修材が、クラックの奥部まで浸透し、補修材がクラック内の水分や水酸化カルシウムと化学的に反応し、母材と同等の強度を得ることができ、クラックを補修することができる。 By this cooling, the pressure inside the crack is reduced, the repair material penetrates deep into the crack, and the repair material chemically reacts with the water in the crack and calcium hydroxide to obtain the same strength as the base material. It can repair cracks.
このようにクラック内の温度差（圧力差）を利用して補修材を浸透させるため、従来では補修が困難であったクラックの幅が０．１ｍｍ以下と狭い場合にも、クラックの奥にまで補修材を浸透させることができる。また、０．１ｍｍ以下のクラックでも補修できるため、クラックからの水等の侵入を防止し、コンクリート部材内の鉄筋が錆びることを抑制できる。 In this way, the repair material is infiltrated using the temperature difference (pressure difference) in the crack, so even if the width of the crack, which was difficult to repair in the past, is as narrow as 0.1 mm or less, it goes deep into the crack. The repair material can be infiltrated. Further, since cracks of 0.1 mm or less can be repaired, it is possible to prevent water or the like from entering through the cracks and prevent the reinforcing bars in the concrete member from rusting.
なお、上記実施例においては、プレキャストコンクリート部材全体を加熱するようにしてが、少なくともクラックの表面から奥部までを所定の温度以上に加熱することができれば、プレキャストコンクリート部材の一部のみを加熱するようにしてもよい。 In the above embodiment, the entire precast concrete member is heated, but if at least the surface to the inner part of the crack can be heated to a predetermined temperature or higher, only a part of the precast concrete member is heated. You may do so.
また、上記実施例においては、本発明を、プレキャストコンクリート部材の製造過程において生じたクラックを補修することに適用したが、プレキャストコンクリート部材の製造過程以外にも、養生中、保管中などにおいて生じたクラックの補修にも適用することができる。 Further, in the above embodiment, the present invention was applied to repairing cracks generated in the manufacturing process of the precast concrete member, but it occurred during curing, storage, etc. in addition to the manufacturing process of the precast concrete member. It can also be applied to repair cracks.
更に、既設のコンクリート部材に生じたクラックに対しても、その少なくともクラックの表面から奥部に亘るまでを、任意の加熱手段を用いて、所定の温度以上に加熱することができれば、任意のコンクリート部材に生じたクラックの補修に対しても、本発明を適用することができる。 Further, even for cracks generated in the existing concrete member, any concrete can be heated to a predetermined temperature or higher by using an arbitrary heating means at least from the surface to the inner part of the crack. The present invention can also be applied to repairing cracks generated in a member.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017149380A JP6979825B2 (en) | 2017-08-01 | 2017-08-01 | How to repair concrete members |
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| JP2017149380A JP6979825B2 (en) | 2017-08-01 | 2017-08-01 | How to repair concrete members |
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| Publication Number | Publication Date |
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| JP2019027204A JP2019027204A (en) | 2019-02-21 |
| JP6979825B2 true JP6979825B2 (en) | 2021-12-15 |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4811530B1 (en) * | 1965-07-26 | 1973-04-13 | ||
| JP2016186158A (en) * | 2015-03-27 | 2016-10-27 | 太平洋セメント株式会社 | Concrete repair method |
| JP2017066761A (en) * | 2015-09-30 | 2017-04-06 | 日立マクセル株式会社 | CONCRETE SELF-REPAIRING ADHESIVE SHEET AND METHOD FOR PRODUCING THE SAME |
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