摘要:針對門廳改造拔柱的需要，提出了采用托換梁和外包混凝土圍套加固支承柱的處理方案，介紹了托換結構的設計原則和方法及施工要點與構造措施，介紹了最后拆柱時的施工要點與技巧.實踐證明，本文提出的托換結構方案經濟適用，施工方便，安全可靠，可供類似工程改造加固時參考.
關鍵詞:托換梁;外包混凝土;加隊

Abstract:To m eetth er equiremento fre constructingt heh allst ructuresa ndr emovingc olumns,th et reatings chemes adoptingb racketgi rdersan ds trengtheningsu pportingco lumnsw ithe ncasedre inforcedc oncreteis b roughtfo rward,and the design principle, design method, construction keypoints and constructional measures of underpinning structures are introduced, as well as the construction keypoints and technique of removing columns are presented.Practices prove the scheme of underpinning structures has economical eficiency, broad applicability and good credibility, while the structures are easy to construct, which can be referenced by the similar projects.
Key words:bracket girder; encased concrete; reinforcin