世界桥梁
世界橋樑
세계교량
WORLD BRIDGE
2015年
1期
23-26
,共4页
立交桥%钢箱梁%复杂交通状况%分块加工%安装%交通疏导%桥梁施工
立交橋%鋼箱樑%複雜交通狀況%分塊加工%安裝%交通疏導%橋樑施工
입교교%강상량%복잡교통상황%분괴가공%안장%교통소도%교량시공
interchange%steel box girder%complex traffic condition%block-by-block fabrica-tion%installation%traffic control%bridge construction
西安国际港务区港务西路立交桥总长1076．83 m ，横跨绕城高速公路部分桥段采用单箱四室等高简支钢箱梁，分东、西2幅，跨长50 m ，钢箱梁重达816．2 t。针对施工现场交通环境复杂、施工场地狭小、钢箱梁重量大、立交桥跨度大等难点，钢箱梁采用分块加工、运输、吊装和安装的施工工艺施工，并对交通进行导改。单幅单跨钢箱梁划分8个吊装单元块，最大吊装重量65．6 t ，单元块加工成型后在工厂内进行试拼装，试拼装精度满足要求后采用平板车运输至现场，采用1台400 t和1台110 t汽车吊按先支座处后中间的顺序吊装（先吊装西半幅，再吊装东半幅），在7号墩和8号墩处的支撑体系采用钢管格构柱形式，在绕城高速上的支撑体系采用满堂支架形式。实践表明，钢箱梁分块吊装和安装的施工工艺确保了施工过程的安全性，提高了匹配精度和成桥线形质量。
西安國際港務區港務西路立交橋總長1076．83 m ，橫跨繞城高速公路部分橋段採用單箱四室等高簡支鋼箱樑，分東、西2幅，跨長50 m ，鋼箱樑重達816．2 t。針對施工現場交通環境複雜、施工場地狹小、鋼箱樑重量大、立交橋跨度大等難點，鋼箱樑採用分塊加工、運輸、弔裝和安裝的施工工藝施工，併對交通進行導改。單幅單跨鋼箱樑劃分8箇弔裝單元塊，最大弔裝重量65．6 t ，單元塊加工成型後在工廠內進行試拼裝，試拼裝精度滿足要求後採用平闆車運輸至現場，採用1檯400 t和1檯110 t汽車弔按先支座處後中間的順序弔裝（先弔裝西半幅，再弔裝東半幅），在7號墩和8號墩處的支撐體繫採用鋼管格構柱形式，在繞城高速上的支撐體繫採用滿堂支架形式。實踐錶明，鋼箱樑分塊弔裝和安裝的施工工藝確保瞭施工過程的安全性，提高瞭匹配精度和成橋線形質量。
서안국제항무구항무서로입교교총장1076．83 m ，횡과요성고속공로부분교단채용단상사실등고간지강상량，분동、서2폭，과장50 m ，강상량중체816．2 t。침대시공현장교통배경복잡、시공장지협소、강상량중량대、입교교과도대등난점，강상량채용분괴가공、운수、조장화안장적시공공예시공，병대교통진행도개。단폭단과강상량화분8개조장단원괴，최대조장중량65．6 t ，단원괴가공성형후재공엄내진행시병장，시병장정도만족요구후채용평판차운수지현장，채용1태400 t화1태110 t기차조안선지좌처후중간적순서조장（선조장서반폭，재조장동반폭），재7호돈화8호돈처적지탱체계채용강관격구주형식，재요성고속상적지탱체계채용만당지가형식。실천표명，강상량분괴조장화안장적시공공예학보료시공과정적안전성，제고료필배정도화성교선형질량。
The interchange on the West Gangwu Road in Xi′an International Harbor Area has a total length of 1 076 .83 m .The part of the interchange crossing the city beltway adopts the four‐cell single box simply‐supported steel box girder with constant height and has separated east and west decks with span length of 50 m ,and the steel box girder weighs up to 816 .2 t .Considering the special conditions at the bridge site ,such as the compiex traffic condition ,the restricted space of the construction site ,the hefty steel box girder and the long interchange spans ,the steel box girder was constructed by the technique of fabricating , transporting , lifting and installing in blocks ,and the traffic was controlled and diverted .The steel box girder in each span of each deck is divided into 8 lifting and installing unit blocks and the maximum lifting weight is about 65 .6 t . The unit blocks were assembled on a trial basis in the workshop after taking shape .After the trial assembling precision meets the requirements ,the unit blocks were transported to the bridge site by flatbed trucks .A 400 t and an 110 t truck cranes were used to hoist and install the box girder blocks from the bearings towards the midspan(the west deck first) .The supporting systems at the pier No .7 and pier No .8 adopt the type of steel pipe latticed columns ,w hereas the supporting sys‐tem standing on the city beltway adopts the type of full scaffold .The engineering practice proves that the construction technique of hoisting and installing the steel box girder block by block en‐sures the safety of the construction process and improves the matching precision and the quality of the geometrical shape of the completed bridge .
