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(中國(guó)建筑第八工程局有限公司， 上海 200135)

［摘要］新型H型鋼支撐體系由H型鋼支撐、鋼圍檁、系桿、千斤頂、立柱和托梁等組成，單根H型鋼支撐通過(guò)系桿連接，系桿與H型鋼支撐位于同一水平面，形成平面桁架體系。與傳統(tǒng)鋼支撐體系相比，新型H型鋼支撐采用全螺栓裝配連接，可以任意組合、拼裝，施工便捷。為了研究新型H型鋼支撐體系的安全性能及其在深大基坑工程中的適用性，以上海靜安府項(xiàng)目基坑工程為背景，對(duì)基坑圍護(hù)樁變形和H型鋼支撐軸力進(jìn)行現(xiàn)場(chǎng)監(jiān)測(cè)，分析基坑圍護(hù)樁頂位移、樁體水平位移和新型H型鋼支撐軸力的變化規(guī)律。結(jié)果表明：基坑圍護(hù)樁頂位移和樁體變形與基坑開(kāi)挖工況和基坑底板澆筑速度密切相關(guān)；新型H型鋼支撐軸力受氣溫影響比較明顯，且氣溫越高，單位溫度變化對(duì)其軸力的影響越明顯。通過(guò)對(duì)新型H型鋼支撐區(qū)域與鋼筋混凝土支撐區(qū)域圍護(hù)樁變形進(jìn)行對(duì)比分析發(fā)現(xiàn)，新型H型鋼支撐區(qū)域圍護(hù)樁頂和樁體位移的變化規(guī)律及最終變形值均與鋼筋混凝土支撐區(qū)域基本一致，且所有監(jiān)測(cè)數(shù)據(jù)都在安全范圍以內(nèi)。 

［關(guān)鍵詞］基坑圍護(hù)；新型H型鋼支撐；現(xiàn)場(chǎng)監(jiān)測(cè)；樁體變形；支撐軸力；溫度影響 

中圖分類號(hào)：TU46-3 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)23-0095-08

Design analysis and engineering application research of new H-section steel support system 

HAN  Lei,  SUN  Min,  HUANG  Peilin,  CHEN  Hua,  WANG  Qiang 

(China Construction Eighth Engineering Division  Co., Ltd., Shanghai 200135， China) 

Abstract: The new H-section steel support system is composed of H-section steel supports, steel purlins, tie rods, jacks, columns and joists, etc. A single H-section steel support is connected by a tie rod, and the tie rod and the H-section steel support are located on the same horizontal plane, forming a plane truss system. Compared with the traditional steel support system, the new H-section steel support adopts full bolt assembly connection, which can be combined and assembled arbitrarily, and the construction is convenient. In order to explore the safety performance of new H-section steel support system and its applicability in deep and large foundation pit project, taking Jinganfu foundation pit project in Shanghai as background, the deformation of the foundation pit retaining pile and the axial force of the H-section steel support were monitored on-site. The change laws in the top displacement of the foundation pit retaining pile, the horizontal displacement of the pile body and the axial force of the new H-section steel support were analyzed. The results show that the top displacement of the foundation pit retaining pile and deformation of the pile body are closely related to the excavation depth and foundation slab concreting speed. The axial forces of new H-section steel support are influenced obviously by temperature，and the higher the temperature, the more obvious the influence of unit temperature change on its axial force. Through the comparative analysis of the deformation of the retaining piles in the new H-section steel supporting area and the reinforced concrete supporting area, it is found that the changing law of the top displacement of the retaining pile and final deformation value of the pile body in the new H-section steel supporting area are basically the same as that of reinforced concrete support area, and all of the monitoring data were within the security range. 

Keywords:foundation pit support； new H-section steel support； in-situ monitoring； deformation of pile body； axial force of support； temperature influence

*國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2017YFC0805004），上海市青年科技英才揚(yáng)帆計(jì)劃資助(18YF1425000)。

 作者簡(jiǎn)介：韓磊，博士，高級(jí)工程師，Email:hanleiwell@163.com。