深大基坑中大開口順逆復合工法的應用
吳昌將1,2
- 摘 要
-
（1 上海建筑設計研究院有限公司，上海 200041；2 同濟大學地下與建筑工程系，上海 200092）[摘要]隨著一大批深大基坑的不斷涌現(xiàn)，常規(guī)的順作法與傳統(tǒng)的逆作法已經(jīng)不能同時滿足深大基坑在安全、環(huán)境保護、工期等各方面的要求。本文借助某一深大基坑的工程實踐，引進主體結構與支護結構相結合的新形式“大開口順逆復合工法”這一全新的設計施工理念，以解決該基坑工程中采用順作法需要大量的臨時支撐和棧橋，支撐剛度相對較小，施工和拆除支撐消耗時間長等缺點，以及逆作法存在施工速度慢、作業(yè)環(huán)境差、技術要求高、適用性限制等問題。工程實踐表明，對于深大基坑，順逆復合工法可以解決業(yè)主對工期方面的要求，能使整個或局部地下室盡快出±0.000；在復合工法基礎上，引進了大開口的理念，完全改變了常規(guī)的地下施工流程，大大地改善了地下作業(yè)的條件，提高了地下施工速度；同時，也滿足了周邊環(huán)境的保護要求。[關鍵詞]深大基坑;順逆復合工法;大開口;支護中圖分類號：TU398.7 文獻標識碼：A 文章編號：1002-848X(2013)S1-0893-05Application of compound construction of bottom-up and top-down with large opening method in large deep foundation pitWu Changjiang1, 2（1 Shanghai Institute of Architectural Design and Research Co. Ltd, Shanghai 200041, China; 2 Department of Underground Structure Engineering, Tongji University, Shanghai 200092, China）Abstract: with a large amount of deep large foundation pits rising, the demand of safety, environment protection and construction speed can’t be satisfied very well by the conventional construction of bottom-up and top-down method. Based on the construction of certain foundation pit, a new technology of combination of substructure and retaining structure, named compound construction method of bottom-up and top-down with large opening is recommended. The difficulties from bottom-up method involving large amount of temporary support, low stiffness of support, and uninstallation of support can be well resolved by means of this method, as well as those from top-down method, which includes slow construction speed, poor working condition, high technology requirements, restriction of its application and the others. It is indicated clearly that the compound construction of bottom-up and top-down method has its own superior in construction speed, and accomplishes the top slab of basement as soon as possible. Additionally, the idea of large opening on the beam-slab system is introduced to change the construction sequence entirely, and it improves the working condition and speed greatly. It is showed that it benefits the environment protection very well.Keywords：deep large foundation pit;compound construction of bottom-up and top-down method;large opening;retaining structure作者簡介：吳昌將，Email: dcggz@163.com。
