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混凝土支撐伺服系統(tǒng)在某深基坑工程的應用研究
翟杰群, 賈 堅, 謝小林
摘 要

(同濟大學建筑設計研究院 (集團) 有限公司, 上海 200092)

摘要: 為有效減小軟土基坑的變形,工程中將液壓千斤頂融入混凝土支撐結構中,形成了混凝土支撐伺服系統(tǒng)(CAC)。 為研究 CAC 的實踐效果,對 CAC 的結構組成和工作機理進行了闡述和分析,并以前灘 21 號地塊基坑工程為例,通過對圍護墻水平變形和支撐軸力實測數(shù)據的研究分析,總結了有無 CAC 兩種情況下圍護墻的變形規(guī)律和支撐軸力的特征。 該項目采用 CAC 的圍護墻實測水平變形僅為基坑開挖深度的 1?? 4‰,滿足了軟土特級基坑的微變形控制要求。 實踐分析表明,CAC 大大提高了混凝土支撐的實際剛度,有效解決了混凝土收縮、徐變等造成的剛度損失問題,顯著減小了開挖面以上圍護墻的變形發(fā)展。 CAC 適用于周邊環(huán)境保護要求高、基坑平面尺寸寬大或形狀不規(guī)則的軟土基坑,應用前景廣闊。

關鍵詞: 混凝土支撐伺服系統(tǒng); 微變形控制; 深基坑; 圍護墻水平變形

中圖分類號:TU318+.1 文獻標志碼:A 文章編號:1002?848X(2022)12?0148?05

 

DOI:10. 19701 / j. jzjg. YG220115

 

Practical research of concrete strut with automatic axial force compensation system in a deep excavation project

ZHAI Jiequn, JIA Jian, XIE Xiaolin

(Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China)

Abstract: To effectively reduce the deformation of soft soil excavation, the concrete strut with automatic axial force compensation system ( CAC) was developed by integrating hydraulic jack into concrete strut and applied in excavation projects. To study the practical effect of CAC, the structure composition and working mechanism of CAC were elaborated  and analyzed. Based on the analysis of monitored horizontal wall deformation and strut force in Qiantan 21# project, the laws of retaining wall deformation and characteristics of strut force in both cases with and without CAC were studied. In this project, the monitored horizontal deformation of retaining wall was only 1?? 4‰ of excavation depth, which reached the micro?deformation control requirements of soft soil excavation with special protection level. It shows that the application of CAC could greatly improve the stiffness of concrete strut, compensate the stiffness loss caused by shrinkage or creep of concrete and reduce the deformation development of wall above excavation face effectively. CAC is suitable for soft soil excavations with high environmental protection requirements, large plane dimensions or irregular shapes, and has broad application prospects.

Keywords:concrete strut with automatic axial force compensation system; micro?deformation control; deep excavation;horizontal deformation of retaining wall

第一作者:翟杰群,博士,高級工程師,注冊土木工程師(巖土),主要從事基坑工程、地下結構工程的設計與咨詢工作,Email:17027116@ qq.com。

[引用本文] 翟杰群,賈堅,謝小林. 混凝土支撐伺服系統(tǒng)在某深基坑工程的應用研究[ J]. 建筑結構,2022,52(12):148?152,147. ZHAI Jiequn,JIA Jian,XIE Xiaolin. Practical research of concrete strut with automatic axial forcecompensation system in a deep excavation project[J]. Building Structure,2022,52(12):148?152,147.
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