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孟加拉某基坑工程地連墻安全評估及加固處理
李煥君1,2,3 , 張 寒1,2,3 , 李 冰1,2,3
摘 要

(1 建筑安全與環(huán)境國家重點(diǎn)實(shí)驗室, 北京 100013; 2 中國建筑科學(xué)研究院地基基礎(chǔ)研究所,北京 100013; 3 國家建筑工程技術(shù)研究中心, 北京 100013)

摘要: 孟加拉某基坑局部探挖后發(fā)現(xiàn)開挖范圍內(nèi)的地連墻普遍存在大面積露筋、混凝土夾渣、少筋等嚴(yán)重缺陷。為全面調(diào)查地連墻缺陷范圍及程度,在基坑大面積開挖前,對地連墻進(jìn)行了一系列質(zhì)量檢測和安全評估工作。 通過檢測發(fā)現(xiàn)存在混凝土質(zhì)量缺陷的地連墻主要集中在基坑西南側(cè),此處回填土深度 7 ~ 10m,地連墻施工未采取槽壁加固措施,混凝土灌注期間發(fā)生塌孔;此外,所施工地連墻均未按設(shè)計圖紙配筋,受力鋼筋缺少 39%;導(dǎo)致地連墻承載力大幅度降低。 根據(jù)以上安全評估結(jié)果,結(jié)合工程實(shí)際情況,對地連墻的加固處理方法進(jìn)行了創(chuàng)新,采用以地連墻為板、H 型鋼為次梁、支撐腰梁為主梁的空間結(jié)構(gòu)加固體系,使工程得以順利推進(jìn)。 最后通過計算和實(shí)測變形結(jié)果的對比進(jìn)一步驗證了加固方案的可行性。

關(guān)鍵詞: 基坑工程; 地連墻; 質(zhì)量缺陷; 質(zhì)量檢測; 安全評估; 加固處理

中圖分類號:TU47 文獻(xiàn)標(biāo)志碼:A 文章編號:1002?848X(2022)12?0139?09

 

DOI:10. 19701 / j. jzjg. LS210201

 

Safety assessment and reinforcement treatment of diaphragm wall of a foundation pit project in Bangladesh LI Huanjun 1,2,3, ZHANG Han1,2,3, LI Bing1,2,3

(1 State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China;2 Institute of Foundation Engineering, China Academy of Building Research, Beijing 100013, China;3 National Research Center for Building Engineering Technology, Beijing 100013, China)

Abstract: After excavating the local part of the foundation pit in Bangladesh, it was identified that there are serious quality defects on the diaphragm wall, such as large?area exposed steel reinforcement, concrete slag inclusion and less steel reinforcement. In order to detect the defect area as well as the degree of defect quality for the diaphragm wall, a series of quality inspections and safety assessments were carried out prior to the full excavation of the foundation pit. Through these quality inspections, it was found that the concrete quality defects on the diaphragm wall are mainly located in the southwest of the foundation pit, where the backfill?soils have a depth of 7 ~ 10m. The trench wall was not reinforced during the construction of diaphragm wall, and thus the hole might be collapse during the post?pouring of the concrete. Additionally,the reinforcement of the constructed diaphragm wall was not conducted according to the design drawings that the percentage of longitudinal steels is about 39% less than the designed reinforcing bars, which results in a significant reduction of the bearing capacity of the diaphragm wall. Based on the results of safety assessments as well as by considering the actual situation of this project, a novel treatment approach for reinforcing the diaphragm wall was developed, by which the space structure reinforcement system is used as the plate, the H?section steel as the secondary beam and the supporting waist  beam as the main beam, so that the project could be processed successfully. Finally, the feasibility of the reinforcementscheme was verified by comparing the calculated and measured results of deformation.

Keywords: foundation pit engineering; diaphragm wall; quality defect; quality inspection; safety assessment;reinforcement treatment

∗中國建筑科學(xué)研究院青年基金課題(20216022331030043)。
第一作者:李煥君,碩士,工程師,國家注冊土木工程師(巖土),Email:leehuanjun@ 163.com。
 
[引用本文] 李煥君,張寒,李冰. 孟加拉某基坑工程地連墻安全評估及加固處理[J]. 建筑結(jié)構(gòu),2022,52(12):139?147. LI Huanjun,ZHANG Han,LI Bing. Safety assessment and reinforcement treatment of diaphragm wall of a foundationpit project in Bangladesh[J]. Building Structure,2022,52(12):139?147.
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