Study On The Subgrade Diseases In Permafrost Of Qinghai-Tibet

Along with the development of the bridge construction, the bridge construction often facein the depths of the pier construction, make the existing construction technology is facingserious challenges.As a temporary structure construction platform construction of the deepwater pier construction have a vital role. Deep pile foundation construction is the key of thebridge construction engineering division, it not only is the key to guarantee period, but alsothe key technology, and the relationship between the progress of the projects. And at this stageof the bridge construction, meet more than10m depth of the elevated pile caps the waterconstruction, the main construction method in steel hanging box method, steel box method,double wall of steel cofferdam method, steel sheet pile cofferdam method, etc.This paper mainly RenHe bridge in deep water foundation construction as the foundation,study with the whole pile caps is deep pile pier construction craft, mainly including steel pipepile platform construction, the construction technology of the cast-in-place pile bearingplatform, the construction technology and the construction technology of the pier. RenHebridge based in deep water depth of30m ankang fire in cliff reservoir, geological conditionsmore complex environment, build the deep pile foundation and the water when bearingplatform and the steel cofferdam scheme hanging box. Double-wall steel cofferdams of thestructure with high strength, waterproof good performance characteristics, in bridge in deepwater foundations to a wide range of applications, and it can bear larger water pressure,simple structure, convenient construction. And this among them deep water drilling is mainconsideration of pile foundation construction process and underwater, the main points of pilecaps is the main part of pile caps is combined with the water features, the technology of thepier is also a deep need to consider the influence of part of the construction in the water.According to the construction experience of Renhe Bridge, the paper mainly introducesthe technical scheme about30m and deepwater pile foundation and in-water base slabconstruction and some problems concerned. What’s more, it mentions the organization andplanning during in construction engineering as well as the attentive problems on projectquality management.