目次

1 章 研究概要
1.1 研究の背景と目的 ............................................................................................. 1
1.2 研究の流れと体制 ............................................................................................. 1
1.2.1 研究の流れ .............................................................................................. 1
1.2.2 研究体制.................................................................................................. 2
1.3 用語の定義 ........................................................................................................ 3
1.4 報告書の構成 .................................................................................................... 4

2 章 ＰＣ橋における初期変状の実態と原因推定
2.1 検討概要 ........................................................................................................... 5
2.2 定期点検データに基づくひび割れパターンの整理 ............................................ 5
2.3 定期点検データに基づくプレテン桁とポステン桁の損傷事例と原因分析 ....... 202.3.1 検討概要................................................................................................ 202.3.2 原因分析を行う橋梁の選定 ................................................................... 212.3.3 統計的なひび割れ発生の原因分析 ......................................................... 232.3.4 点検調書による原因分析 ....................................................................... 282.3.5 まとめと今後の検討課題 ....................................................................... 312.4 急曲線を有する PC 橋の損傷事例と原因分析 ................................................. 32
2.4.1 検討概要................................................................................................ 322.4.2 ひび割れの発生状況 .............................................................................. 33
2.4.3 ひび割れの発生原因 .............................................................................. 34
2.4.4 「H24 年道路橋示方書」、「H6 年コンクリート道路橋設計便覧」に基づく
設計 ................................................................................................................ 36
2.4.5 まとめ ................................................................................................... 40
2.5 本研究で対象とする初期変状.......................................................................... 41

3 章 設計および施工の技術変遷調査
3.1 調査概要 ......................................................................................................... 43
3.2 調査項目の抽出 ............................................................................................... 43
3.3 変遷調査 ......................................................................................................... 51
3.3.1 変遷調査の概要 ..................................................................................... 51
3.3.2 設計の変遷調査結果 .............................................................................. 51

3.3.3 Ê¬7ōĆĜ¾k .............................................................................. 56
3.4 ōðÍű7yĶ ............................................................................................... 62
3.5 äōðŔË6ª"+ōĆĜ¾k7Ŋÿ .................................................... 72
3.5.1 vš....................................................................................................... 72
3.5.2 ōðÍű6>30!äōðŔËá7Ŋÿ ....................................... 72
3.5.3 ¯5CäōðŔË6ª"+ďÁ7őª÷ ........................................... 75
3.6 ;3= ............................................................................................................. 76
4 ì ~f7äōðŔËďÁ7Ĝ¾4.1 Įvš ......................................................................................................... 77
4.2 ç}ã7įªĜ¾ ........................................................................................... 784.2.1 ç}ã7°ø ........................................................................................ 784.2.2 ç}ã7äōðŔËďÁ7Ŋÿ ....................................................... 111
4.2.3 äōðŔËďÁ7őª÷ ................................................................. 1174.3 äōðŔËďÁ6|'CŋĜ¾ ............................................................. 1194.3.1 ŋĜ¾k ...................................................................................... 1204.3.2 ŋĜ¾k7;3= ........................................................................ 133
4.3.3 ;3= ................................................................................................. 137
4.4 äōðŔË7+=7Ģ_Í³ .................................................................... 138
4.4.1 Ê¬Î@:â¬¥7×¿ŰÎ6ü&?'9:{DÍű ................ 138
4.5 ;3= ........................................................................................................... 160

5 ì Ô6"CÊ¬Î7įċ
5.1 Įvš ....................................................................................................... 161
5.2 Ê¬ę7įċ*7 Éŏ¬lā .................................................. 162
5.2.1 ūvš.............................................................................................. 162
5.2.2 Éŏ¬ĽŮ .......................................................................................... 166
5.2.3 ĥ9(<3I\GWPhĨ .......................................................... 177
5.3 Ê¬ę7įċ*7 ěà%lā .................................................. 195
5.3.1 ūvš.............................................................................................. 195
5.3.2 ĥ I\GWP9(<3I\GWPhĨ.................................. 199
5.4 ;3= ........................................................................................................... 222

6 ì ;3= ............................................................................................................ 223

参 考 資 料
資料-1 施工中の挙動計測データ（その１：支保工架設） ...............................参- 3
資料-2 施工中の挙動計測データ（その２：張出し架設） ...............................参-23