- 摘 要
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萬墨林 韓繼云
（中國建筑科學研究院 北京 100013）[提要] 論述了一個大型托換工程設計施工全過程。該工程利用原有條形基礎，采用空間閉合框架及組合墻梁結(jié)構(gòu)作為新的傳力體，受力合理，克服了新舊結(jié)構(gòu)變形不協(xié)調(diào)的弊病。施工中采用機械割拆及預應力卸荷措施，保證了力的平穩(wěn)轉(zhuǎn)換，避免了轉(zhuǎn)換時上部結(jié)構(gòu)出現(xiàn)裂縫。實踐表明，該工程使用效果良好。
[關(guān)鍵詞] 舊房改造 托梁拆墻 閉合框架 傳力途徑 預應力卸荷This paper presents a full process for design and construction by supporting and exchanging procedure to rebuild a large building project. Based on the original strip foundation of primary project, a self-enclosed frame and a combined beam-wall structure were used to form a new force-transmitting system with reasonable bearing capacity, then the uncompatible deformation occurred between the new and existing structures was avoided. In the supporting and exchanging procedure, some measures such as unloading using prestressing method, demolishing primary wall by mechanical cut-off etc. were used to ensure the stable transmission of forces in the process of demolition, the cracking on superstructure are also avioded during the exchange.
Keywords: existing building structure; reconstruction; supporting and exchanging procedure; space selfenclosed frame; force-transmission path; unloading using prestressing
