JP4993131B2 - 既設構造物の基礎補強工法 - Google Patents
既設構造物の基礎補強工法 Download PDFInfo
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- JP4993131B2 JP4993131B2 JP2008052019A JP2008052019A JP4993131B2 JP 4993131 B2 JP4993131 B2 JP 4993131B2 JP 2008052019 A JP2008052019 A JP 2008052019A JP 2008052019 A JP2008052019 A JP 2008052019A JP 4993131 B2 JP4993131 B2 JP 4993131B2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
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- 239000010959 steel Substances 0.000 description 2
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Claims (4)
- 既設構造物の基礎を補強する工法であって、
既設構造物の基礎になっている複数本の既設の基礎杭から所定の1本以上の基礎杭を補強対象杭として選択し、既設構造物の直下の地盤に既設構造物の底面に沿って補強対象杭に達する横穴を掘削して、補強対象杭の上部を横穴内に露出させる工程と、
補強対象杭の周囲の地盤を横穴から下方に掘り進めて、補強対象杭より大径の拡径穴を掘削する工程と、
拡径穴と横穴内に露出する補強対象杭の上部周囲とにコンクリートを打設して、補強対象杭の周囲にコンクリートによる拡径補強部を構築する工程とを備え、
拡径穴を掘削する工程では、既設構造物の底面を反力受け面として補強対象杭の周囲の地盤に筒状の支保材を圧入しつつ、支保材と補強対象杭との間の地盤を掘削することを特徴とする既設構造物の基礎補強工法。 - 前記支保材と前記補強対象杭との間に水を注入し、支保材と補強対象杭との間の地盤を水中掘削機を用いて水中掘削することを特徴とする請求項1記載の既設構造物の基礎補強工法。
- 前記水中掘削機は、前記補強対象杭をガイドにして上下動自在であることを特徴とする請求項2記載の既設構造物の基礎補強工法。
- 前記拡径補強部を構築した後、前記横穴にコンクリートを打設して、地中梁を構築する工程を備えることを特徴とする請求項1〜3の何れか1項記載の既設構造物の基礎補強工法。
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JP2008052019A JP4993131B2 (ja) | 2008-03-03 | 2008-03-03 | 既設構造物の基礎補強工法 |
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JP2009209547A JP2009209547A (ja) | 2009-09-17 |
JP4993131B2 true JP4993131B2 (ja) | 2012-08-08 |
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CN109723063B (zh) * | 2018-12-21 | 2023-10-27 | 中冶集团武汉勘察研究院有限公司 | 一种用于基坑支护的集束桩垛支护结构及其计算方法 |
KR102092514B1 (ko) * | 2019-11-21 | 2020-03-23 | 황판용 | 기초보강을 위한 기존 기초 하부면의 확대굴착 방법 |
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JPS6462524A (en) * | 1987-09-01 | 1989-03-09 | Kumagai Gumi Co Ltd | Construction of underground beam |
JP3213240B2 (ja) * | 1996-07-11 | 2001-10-02 | 株式会社奥村組 | 既設構造物の支持杭補強構造とその補強方法 |
JPH10131176A (ja) * | 1996-10-30 | 1998-05-19 | Takenaka Komuten Co Ltd | 外巻き鋼管の圧入による既存杭の補強方法 |
JP4705497B2 (ja) * | 2006-03-27 | 2011-06-22 | 株式会社竹中工務店 | 既存建物の杭基礎の補強方法 |
JP4722783B2 (ja) * | 2006-07-03 | 2011-07-13 | 株式会社竹中工務店 | 既存建物の基礎補強工法 |
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