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| Research on the Construction Quality Control of the Super Large - long Diameter Bored Piles Steel Reinforcement Cage |
| ZHANG Xi – min |
| (Shanghai Railway Bureau，Ningbo，Zhejiang 315000，China) |
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Abstract Abstract ：Research purposes： In order to solve the problem of deformation and placing precision in making，lifting and fixing of super large - long diameter bored piles' steel reinforcement， the reinforcement cage of super long - large diameter bored piles is analyzed systematically witli Midas/civil in order to simulate the stress and deformation states of each process when in the manufacture and installation. Research conclusions ：( 1 ) For propose of control the stress and strain of manufacture and installation， !28 grade HRB335 rebar is used to be main reinforcement and 112. 6 as stirrup. When lifting，the lifting point is 4 meters from the end，dividing the !32 main reinforcement into four groups as steel hanger and placing it on the joist steel. (2) To make sure the thickness of pile body concrete protective layer，the long - term construction is used to process the reinforcement cage，every 4 meters along the circumference layout four steel bar as protective layer， and there is 200 cm horizontal direction stagger between up and down. (3) Keeping unification of process and installation of but joint as well as controlling the quality of sounding pipe in the way of materials and construction process can prevent the accident availably.
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Received: 27 February 2017
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2017, Vol. 34 
