JP7664679B2 - Labor-saving method for surface treatment of reinforced concrete slabs - Google Patents
Labor-saving method for surface treatment of reinforced concrete slabs Download PDFInfo
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Description
本発明は、橋面コンクリート舗装の施工時の鉄筋コンクリート床版の表面処理を省力化する方法に関する。 The present invention relates to a method for reducing the labor required for surface treatment of reinforced concrete decks during construction of bridge deck concrete pavement.
橋面コンクリート舗装は土工部の舗装と比較して変位が大きいため、施工する際は舗装と鉄筋コンクリート床版の付着が強いことが求められる。そこで、付着を強くするため、接着剤の使用（特許文献３）や、ウォータージェット（特許文献１、２、４）、およびショットブラスト（特許文献３）による表面処理が行われる。しかし、橋梁全面に前記表面処理を行えば、施工費用や労働量が増加する。
Since concrete pavement on bridge decks is subject to greater displacement than pavement on earthworks, strong adhesion between the pavement and the reinforced concrete deck is required during construction. To strengthen adhesion, adhesives are used (Patent Document 3) and surface treatments are carried out using water jets (
そこで、本発明は、橋面コンクリート舗装の施工時の鉄筋コンクリート床版の表面処理を省力化する方法を提供することを目的とする。 The present invention aims to provide a method for reducing the labor required for surface treatment of reinforced concrete decks during construction of bridge deck concrete pavement.
本発明者らは、前記目的にかなう省力化方法を検討するため、橋面コンクリート舗装の温度応力解析を行ったところ、橋梁の端部に引張応力が発生することを解明した。そして、この知見に基づき、表面処理を鉄筋コンクリート床板の端部のみに行えば、橋面コンクリート舗装の施工時の鉄筋コンクリート床板の表面処理を省力化できることを見い出し、本発明を完成させた。すなわち、本発明は以下の構成を有する鉄筋コンクリート床板の表面処理の省力化方法である。 In order to study a labor-saving method that would meet the above-mentioned objective, the inventors performed a temperature stress analysis of the concrete pavement on the bridge deck, and discovered that tensile stress occurs at the ends of the bridge. Based on this knowledge, they discovered that labor can be saved in the surface treatment of reinforced concrete decks during the construction of the concrete pavement on the bridge deck by performing surface treatment only on the ends of the reinforced concrete decks, and thus completed the present invention. In other words, the present invention is a labor-saving method for surface treatment of reinforced concrete decks having the following configuration.
［１］鉄筋コンクリート床板の橋軸方向（橋の一方の渡り口から他方の渡り口への方向）の両端部の端から１ｍ以内の範囲を、ウォータージェットおよび／またはショットブラストにより表面処理して、鉄筋コンクリート床板の凹凸の深さの平均を１．０８～４．１１ｍｍにした後、スチレン・ブタジエンゴムラテックス改質速硬コンクリートを５～６ｃｍ増厚することにより、橋面コンクリート舗装と鉄筋コンクリート床版の付着強度を１．０Ｎ／ｍｍ２以上とすることを特徴とする、鉄筋コンクリート床板の表面処理の省力化方法（ただし、上記ウォータージェットおよび／またはショットブラストにより表面処理する範囲は、鉄筋コンクリート床板の橋軸方向（橋の一方の渡り口から他方の渡り口への方向）の両端部の端から１ｍ以内の範囲に限る。）。 [1] A labor-saving method for surface treatment of reinforced concrete slabs, characterized in that an area within 1 m from both ends of the reinforced concrete slab in the bridge axial direction (from one bridge entrance to the other) is surface-treated with water jets and/or shot blasting to set the average depth of the unevenness of the reinforced concrete slab to 1.08 to 4.11 mm, and then the styrene-butadiene rubber latex-modified quick-hardening concrete is increased in thickness by 5 to 6 cm, thereby making the adhesive strength between the bridge deck concrete pavement and the reinforced concrete slab 1.0 N/ mm2 or more (however, the area surface-treated with the water jets and/or shot blasting is limited to an area within 1 m from both ends of the reinforced concrete slab in the bridge axial direction (from one bridge entrance to the other) .
本発明によれば、橋面コンクリート舗装の施工時の鉄筋コンクリート床版の表面処理を省力化することができる。 The present invention makes it possible to reduce the labor required for surface treatment of reinforced concrete decks during construction of bridge deck concrete pavement.
以下、本発明の鉄筋コンクリート床板の表面処理の省力化方法について、詳細に説明する。
該省力化方法では、鉄筋コンクリート床板の端部のみを表面処理する。鉄筋コンクリート床板の端部のみを表面処理することにより、橋面コンクリート舗装の施工時の鉄筋コンクリート床板の表面処理を省力化できる
そして、前記表面処理は、ウォータージェットおよび／またはショットブラストが挙げられる。
また、前記表面処理による鉄筋コンクリート床板の凹凸の深さの平均が１ｍｍ以上である。凹凸の深さの平均が１ｍｍ以上あれば、橋面コンクリート舗装と鉄筋コンクリート床板の付着強度は、後掲の表１に示すように、目標強度である１．０Ｎ／ｍｍ２以上になる。
The labor-saving method for surface treatment of reinforced concrete floor slabs according to the present invention will be described in detail below.
In this labor-saving method, only the ends of the reinforced concrete slabs are surface-treated. By surface-treating only the ends of the reinforced concrete slabs, the labor required for surface treatment of the reinforced concrete slabs during construction of the bridge deck concrete pavement can be reduced. The surface treatment can be performed by water jet and/or shot blasting.
In addition, the average depth of the unevenness of the reinforced concrete slab due to the surface treatment is 1 mm or more. If the average depth of the unevenness is 1 mm or more, the bond strength between the bridge concrete pavement and the reinforced concrete slab will be the target strength of 1.0 N/ mm2 or more, as shown in Table 1 below.
以下、本発明を実施例により説明するが、本発明はこれらの実施例に限定されない。
１．ラテックス改質速硬コンクリートを用いた鉄筋コンクリート床板上の橋麺コンクリート舗装に発生するそり応力の解析
解析対象は、鉄筋コンクリート床版上にラテックス改質速硬コンクリートを５ｃｍ増厚した鉄筋コンクリートの桁橋である。
解析は、橋長を１０、２０、および３０ｍ、床板厚を１５ｃｍ、および２０ｃｍに設定し、これらに、温湿度データとして沖縄県那覇市の夏季（図１）と、北海道札幌市の冬季（図２）を組み合わせて、全部で３×２×２＝１２通りの条件を設定して行った。なお、図３に前記夏期と冬期の相対湿度の経時変化を示す。
圧縮強度は、既設床板で２４Ｎ／ｍｍ２、ラテックス改質速硬コンクリートで７０Ｎ／ｍｍ２に設定した。また、既設床板の乾燥収縮は終了していると仮定し、ラテックス改質速硬コンクリートのみ、土木学会の収縮予測式（下記のＡ式）を用いて乾燥収縮を考慮した。外気温は橋梁側面、および下面は気象庁の気温データ、橋梁上面は，日射の影響を考慮した換算外気温を用いた。解析期間は合計３１日間として、初めの３日間は橋梁の温度分布を現実に近づけるため、ラテックス改質速硬コンクリートの乾燥収縮は考慮せずに解析し、その後の２８日間は乾燥収縮を考慮して解析した。なお、前記解析に用いたソフトは、ASTEA MACS(計算力学研究センター製）である。この解析結果を図４に示す。
1. Analysis of warping stress generated in bridge concrete pavement on reinforced concrete deck using latex-modified rapid hardening concrete The subject of analysis is a reinforced concrete girder bridge with a 5 cm thick layer of latex-modified rapid hardening concrete on a reinforced concrete deck.
The analysis was carried out by setting bridge lengths of 10, 20, and 30 m, deck thicknesses of 15 cm and 20 cm, and combining these with temperature and humidity data from Naha City, Okinawa Prefecture in summer (Figure 1) and Sapporo City, Hokkaido in winter (Figure 2), for a total of 3 x 2 x 2 = 12 different conditions. Figure 3 shows the time-dependent changes in relative humidity in summer and winter.
The compressive strength was set to 24 N/ mm2 for the existing deck and 70 N/ mm2 for the latex-modified rapid hardening concrete. It was assumed that the drying shrinkage of the existing deck had been completed, and the drying shrinkage of the latex-modified rapid hardening concrete alone was taken into account using the shrinkage prediction formula of the Japan Society of Civil Engineers (Formula A below). The outside air temperature was calculated using the temperature data of the Japan Meteorological Agency for the sides and underside of the bridge, and the converted outside air temperature considering the effects of solar radiation was used for the top surface of the bridge. The analysis period was 31 days in total, and the analysis was performed without considering the drying shrinkage of the latex-modified rapid hardening concrete for the first three days in order to make the temperature distribution of the bridge closer to reality, and the analysis was performed with the drying shrinkage taken into account for the following 28 days. The software used for the analysis was ASTEA MACS (manufactured by Computational Mechanics Research Center). The analysis results are shown in Figure 4.
図４に示すように、鉄筋コンクリート床版とラテックス改質速硬コンクリートの界面に発生するそり応力は、いずれも鉄筋コンクリート床版と橋面コンクリート舗装の界面の両端部の端から１ｍの範囲内で最も高い値を示した。このことから、鉄筋コンクリート床版の両端部の端から１ｍ以内の範囲を、ウォータージェットやショットブラストによる表面処理を行えばよいことが分かった。
なお、残りの１１通りの解析結果は、図４と同様であるため、省略した。
As shown in Figure 4, the warping stress generated at the interface between the reinforced concrete deck and the latex-modified rapid hardening concrete was highest within 1 m from both ends of the interface between the reinforced concrete deck and the bridge deck concrete pavement. This shows that surface treatment using water jet or shot blasting should be performed within 1 m from both ends of the reinforced concrete deck.
The remaining 11 analysis results are omitted because they are the same as those in FIG.
２．付着強度の測定
（１）使用材料
（i）セメント（略号：C）
普通ポルトランドセメント（太平洋セメント社製）
（ii）細骨材（略号：S）
山砂(静岡県掛川市産)
（iii）粗骨材（略号：G）
砕石2005(茨城県桜川市産)
（iv）速硬性混和材（略号：F）
Facet(太平洋マテリアル社製)
（v）ラテックス混和液（略号：L）
スチレン・ブタジエンゴムラテックス（太平洋マテリアル社製）
（vi）水（略号：W）
上水道水
2. Measurement of adhesion strength (1) Materials used (i) Cement (abbreviation: C)
Ordinary Portland cement (manufactured by Taiheiyo Cement Corporation)
(ii) Fine aggregate (abbreviation: S)
Mountain sand (Kakegawa City, Shizuoka Prefecture)
(iii) Coarse aggregate (abbreviation: G)
Crushed stone 2005 (from Sakuragawa City, Ibaraki Prefecture)
(iv) Rapid hardening admixture (abbreviation: F)
Facet (manufactured by Pacific Materials)
(v) Latex mixture (abbreviation: L)
Styrene-butadiene rubber latex (manufactured by Pacific Materials Co., Ltd.)
(vi) Water (Abbreviation: W)
Tap water
２．供試体の作製
常法により調製した基層コンクリート（厚さ60mm）を型枠に投入して材齢７日までシート養生した後、基層コンクリートの表面を、表２に記載のとおり、ショットブラストまたはウォータージェットにより処理して、表２に示すきめ深さにした後、基層コンクリートの表面を水湿した。
次に、表１の配合に従い、前記セメント、細骨材、粗骨材、および速硬性混和材を、強制練りミキサに投入して１５秒間空練りした後、さらにラテックス混和液を溶解した水を投入して１２０秒間混練してラテックス改質速硬コンクリートを調製した。さらに、このラテックス改質速硬コンクリートを基層コンクリートの上に投入して、縦1000mm×横1000mm×厚さ120mm（基層コンクリート、およびラテックス改質速硬コンクリートの厚さはいずれも60mmである。）の供試体を作製した。
2. Preparation of specimens Base layer concrete (60 mm thick) prepared by the usual method was poured into a formwork and left to cure for up to 7 days. The surface of the base layer concrete was then shot blasted or water jet treated as shown in Table 2 to give the texture shown in Table 2, after which the surface of the base layer concrete was moistened with water.
Next, according to the composition of Table 1, the cement, fine aggregate, coarse aggregate, and rapid hardening admixture were put into a forced mixing mixer and mixed for 15 seconds, and then water containing dissolved latex admixture was added and mixed for 120 seconds to prepare latex-modified rapid hardening concrete. This latex-modified rapid hardening concrete was then put on top of the base concrete to prepare test specimens measuring 1000 mm long x 1000 mm wide x 120 mm thick (the thickness of both the base concrete and the latex-modified rapid hardening concrete was 60 mm).
３．付着強度の測定
付着強度の測定は、材齢40日の時点で、前記供試体から直径100mmのコアを採取し両引き試験を実施して行った。その結果を表２に示す。
3. Measurement of adhesion strength The adhesion strength was measured by taking a core of 100 mm in diameter from the above specimen at the age of 40 days and carrying out a double pull test. The results are shown in Table 2.
表２に示すように、表面処理により形成した鉄筋コンクリート床板の凹凸の深さの平均（きめ深さ）が１ｍｍ以上であれば、橋面コンクリート舗装と鉄筋コンクリート床板の付着強度は、目標強度である１．０Ｎ／ｍｍ２以上になる。 As shown in Table 2, if the average depth of the unevenness (grain depth) of the reinforced concrete slab formed by surface treatment is 1 mm or more, the adhesion strength between the bridge deck concrete pavement and the reinforced concrete slab will be the target strength of 1.0 N/ mm2 or more.
Claims (1)
A labor-saving method for surface treatment of reinforced concrete slabs, characterized in that an area within 1 m from both ends of the reinforced concrete slab in the bridge axial direction (from one bridge entrance to the other) is surface-treated with water jets and/or shot blasting to set the average depth of the unevenness of the reinforced concrete slab to 1.08 to 4.11 mm, and then the styrene-butadiene rubber latex modified quick-hardening concrete is increased in thickness by 5 to 6 cm, thereby making the adhesive strength between the bridge deck concrete pavement and the reinforced concrete slab 1.0 N/ mm2 or more (however, the area surface-treated with water jets and/or shot blasting is limited to an area within 1 m from both ends of the reinforced concrete slab in the bridge axial direction (from one bridge entrance to the other) .
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| JP2571436B2 (en) * | 1989-03-24 | 1997-01-16 | 新東工業株式会社 | Concrete thickening method |
| JP2875770B2 (en) * | 1995-09-06 | 1999-03-31 | 新東京国際空港公団 | Overlay method by concrete pavement |
| JP3445932B2 (en) * | 1998-04-17 | 2003-09-16 | 新東京国際空港公団 | Jointing concrete and jointing method using the joining concrete |
| JP2985877B1 (en) * | 1998-05-28 | 1999-12-06 | 新東京国際空港公団 | Surface treatment shape evaluation system and surface treatment shape |
| JP2000000812A (en) * | 1998-06-12 | 2000-01-07 | Kawasaki Heavy Ind Ltd | Concrete hanging method and equipment |
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| Title |
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| 兵頭彦次 他, ラテックス改質速硬コンクリートの橋面舗装への適用と供用性評価, 第１０回道路橋床版シンポジウム論文報告集 土木学会, 2018, 発行日, 285-290頁 |
| 国立研究開発法人土木研究所 他, コンクリート舗装の維持修繕工法の改善に関する共同研究報告書, 201903, 発行日, 82-111頁 |
| 土木学会鋼構造委員会道路橋床版の複合劣化に関する調査研究小委員会編, 道路橋床版の橋面コンクリート舗装, 土木学会, 201611, 発行日, ３８頁－５１頁 |
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