Study And Application Of Integral Lifting With Concentrated Hydraulic Jack In Large-span Steel Truss

With the enhancement of overall national strength and the speedup of modernization, every kind of construction of large common facilities develops boomly. The wide span and large space structures, such as gymnasium, meeting exhibition center, hangar, theater...etc are built in quantity in big city in whole country. In these projects, because of the heavy weight, big volume, large span, high height of assemblage and exigent assemblage accuracy, it's no wonder that we put forward higher and stricter requirements to construction techniques. Therefore, the study and application of the new assemblage technique of large structures has very important and realistic meaning to speed up the modernization of our country. The technique of integral lifting with concentrated hydraulic jack, which developed gradually in construction industry in recent years, just adapts to the need. It mainly adopts the methods of the steel strand hanging weight, integral lifting concentrated hydraulic jacks and computer controlling synchronization. Base on this theory, to the technique's application in the integral lifting construction process of hangar's steel roof, this paper makes further analysis to some problems which need emphatic disposal. ①The author makes further discussion to the fix of lift position and reinforcement, and puts forward some basic principles of fixing lift position and measures of reinforcing load bearing when it is not enough. ②The pillars' stability problems in lifting process have been analyzed and the temporary stability reinforce measures have been put forward when stability is insufficient. ③The author discussed anchoring principle and technique measures of load bearing steel strand, analyzed the balance problem of steel strand's load in the same hydraulic jack. ④In order to construct conveniently, some problems of the steel truss assemble on the ground, for example, subsection and arch camber of steel truss, have been discussed. ⑤The author analyzed the influence on structure internal force combining variance in hangar lifting in Guangzhou new Baiyun International Airport. The results show that valid control of variance can insure the change of structure internal force within the scope of design. Finally, the author introduces the concrete application of integral lifting technique in Guangzhou new Baiyun International Airport.