JP5119381B2 - 地盤改良方法 - Google Patents
地盤改良方法 Download PDFInfo
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- JP5119381B2 JP5119381B2 JP2008123784A JP2008123784A JP5119381B2 JP 5119381 B2 JP5119381 B2 JP 5119381B2 JP 2008123784 A JP2008123784 A JP 2008123784A JP 2008123784 A JP2008123784 A JP 2008123784A JP 5119381 B2 JP5119381 B2 JP 5119381B2
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- injection
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Description
図1に基づいて、静的圧入締固め工法であるCPG(コンパクショングラウチング)工法を概略的に説明する。なお、本発明において、「静的圧入締固め工法」とは、動的エネルギー(打撃や振動)を与えない、静的な力(ポンプによる注入圧力)による締固め工法を意味する。CPG工法は、静的圧入締固め工法の代表例である。
以下、上述したCPG工法を背景技術とする地盤改良方法について説明する。
図2に基づいて、地盤改良方法の第1実施形態について説明する。
次に、図5に基づいて、地盤改良方法の第2実施形態について説明する。
次に、図6に基づいて、地盤改良方法の第3実施形態について説明する。
図6において、上段は従来の方法を示しており、下段は第3実施形態に係る地盤改良方法を示している。
すなわち、図6の上段に示す従来のCPG工法の場合では、1ステップ33cmを標準としてステップアップを行っている。これに対し、図6の下段に示す実施形態の場合では、ステップアップ長さを短縮(たとえば10cm程度に短縮)している。図3に示すように、ステップアップ時には圧入圧力は除荷され、このとき地盤に与えられた応力も減少する。したがって、注入管1本当たりのステップアップ回数が増加し、圧入の繰り返し回数が増加するので、結果として圧縮効率が上昇する。
次に、図7に基づいて、本発明に係る地盤改良方法の実施形態について説明する。
1a 第1の注入管
1b 第2の注入管
3 注入管リフト装置
5 特殊注入プラント
7 特殊注入ポンプ
9 圧送ホース
11 第1の管路
12 第2の管路
21 第1のバルブ
22 第2のバルブ
30 スイングチューブ
31 第1のピストン
32 第2のピストン
Claims (1)
- 土中で迷走することなく固結する地盤改良材をポンプを用いて圧入する静的圧入締固め工法を利用して地盤を改良する方法であって、
地盤改良材をポンプで押し出して、第1の注入管を介して地盤中に圧入する工程と、
地盤改良材をポンプで押し出して、前記第1の注入管に隣接する第2の注入管を介して地盤中に圧入する工程と、を含んでおり、
上記圧入工程を交互に繰り返すことにより、隣接する注入管の間の地盤に対し、一方の注入管を介しての載荷と除荷、および他方の注入管を介しての載荷と除荷を交互に作用させ、前記地盤改良材から成る固結体を地盤中に連続的に造成することを特徴とする地盤改良方法。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008123784A JP5119381B2 (ja) | 2008-05-09 | 2008-05-09 | 地盤改良方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2008123784A JP5119381B2 (ja) | 2008-05-09 | 2008-05-09 | 地盤改良方法 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005372909A Division JP4300367B2 (ja) | 2005-12-26 | 2005-12-26 | 地盤改良方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2008190320A JP2008190320A (ja) | 2008-08-21 |
JP5119381B2 true JP5119381B2 (ja) | 2013-01-16 |
Family
ID=39750658
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Application Number | Title | Priority Date | Filing Date |
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JP2008123784A Active JP5119381B2 (ja) | 2008-05-09 | 2008-05-09 | 地盤改良方法 |
Country Status (1)
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JP (1) | JP5119381B2 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5911159B1 (ja) * | 2015-10-29 | 2016-04-27 | 株式会社トラバース | 地盤改良材の注入システム及び柱列式連続壁工法 |
JP5911161B1 (ja) * | 2016-01-08 | 2016-04-27 | 株式会社トラバース | 地盤改良材の注入システム及び柱列式連続壁工法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5144166Y2 (ja) * | 1972-02-14 | 1976-10-27 | ||
JP2743232B2 (ja) * | 1992-08-18 | 1998-04-22 | 株式会社日東テクノ・グループ | 地盤改善方法 |
JP3418069B2 (ja) * | 1996-03-01 | 2003-06-16 | 強化土エンジニヤリング株式会社 | 注入工法ならびに注入装置 |
JPH10311274A (ja) * | 1997-05-12 | 1998-11-24 | Osamu Kitahara | カム駆動ピストンポンプ |
JP2002115648A (ja) * | 2000-10-05 | 2002-04-19 | Hara Kogyo Kk | 新型特殊ポンプ構造 |
JP3731870B2 (ja) * | 2001-07-19 | 2006-01-05 | 鹿島建設株式会社 | 流動性材料の注入方法および装置 |
JP3934116B2 (ja) * | 2004-03-25 | 2007-06-20 | 強化土エンジニヤリング株式会社 | 軟弱地盤の改良工法 |
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2008
- 2008-05-09 JP JP2008123784A patent/JP5119381B2/ja active Active
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JP2008190320A (ja) | 2008-08-21 |
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