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1、武汉国际贸易中心大厦工程（Wuhan International Trade Center building project）Wuhan International Trade Center building projectI. General Situation of the projectWuhan International Trade Center (hereinafter referred to as Wuhan China World Trade Center) is located in Hankou southwest side of the intersection of X
2、inhua Road Avenue and the construction, is a tube structure with two floors underground and fifty-five floors on the ground of the reinforced concrete tube in high-rise comprehensive office building, high 211.80m, total construction area of 130 thousand square meters.Wuhan China World Trade Center s
3、tandard layer is long 64.40m, middle width of 38.60m, wide 32.40m at both ends of the spindle shaped plane, building area of 2300 square meters. The outer cylinder is composed of deep beams, dense columns and four circular angle cylinder, cylinder composed of elevator shafts, staircases several long
4、itudinal and transverse shear wall, between the inner and outer cylinders connected by a dense prestressed slab structure, multi beam spacing were 0.8m and 0.85m, respectively, with 4 dense beam beam or 10 7 beam diameter of 5 unbonded prestressed steel strand. Wuhan China World Trade Center of the
5、bored pile foundation reinforced concrete basement floor, a pile cap, the thickness of 3.10m - 4.80m, floor buried bottom elevation in 15.60m, deepen local - 16.70m and a volume of 11000 cubic meters, is a super thick mass concrete.Wuhan China World Trade Center designed by the Wuhan Architectural D
6、esign Institute, the construction unit of the Wuhan hanpeng Real Estate Development Co. Ltd., all construction, installation engineering by the construction general contracting three, built in three innings and two main construction company, started in March 1994, July 1997 completed the main.Two, t
7、he application of new technologiesDewatering technique of confined water in large area of ultra deep foundation pit without seepage control curtain measures in 1 and two yuan structure stratumWuhan China World Trade Center area soil from top to bottom were artificial soil and clay, silty clay, silt,
8、 sand, gravel, sand and gravel in the layer in the Yangtze River as a supplemental source of water, confined water has hydraulic connection, confined water head elevation in 8.0m, along with the fluctuation of water level of the Yangtze River fluctuates. Buried depth for 16.80m Wuhan China World Tra
9、de Center basement, foundation pit excavation in silty sand containing rich groundwater, floor construction to head elevation of confined groundwater in foundation pit fell to below 18.50m. In the concrete implementation, the following main technical measures have been taken:(1) the different nature
10、 of the groundwater were using different methods, precipitation is the focus of deep confined groundwater, by retaining upper dive under complete wells deep confined groundwater reduced precipitation scheme.(2) develop precipitation design software, use computer aided design to optimize the design o
11、f the number and layout of precipitation wells, and predict the precipitation effect and the additional settlement of soil layer caused by precipitation.(3) to construct improved precipitation well, reduce the sand content in water.Under the premise of effective control of environmental land subside
12、nce, Wuhan China World Trade Center has implemented large amount of deep water precipitation with 30 thousand M3 of sunrise water.2. Preparation and pumping technology of large flow high strength concreteWuhan China World Trade Center concrete design C65C40, are of high strength concrete, and concre
13、te, the standard layer is more than 1300 m3, non standard layer is 16001900m3, basement floor 11000m3.Make full use of Wuhan limestone gravel and mechanism of ordinary portland cement 525# configuration for the sliding process, meet the slump of 160 200mm pumping requirements of C60 and C65 large fl
14、ow of high strength concrete, the vertical and horizontal mechanical pumping cloth, realizes irrigation concrete overall mechanization.3, super thick mass concrete pouring construction technologyWuhan China World Trade Center basement floor thickness of 3.10m-4.80m, the total amount of concrete 11 t
15、housand M3, the design requirements of the use of C40 concrete, a continuous overall casting. The key of mass concrete construction technology is to control the absolute temperature rise of concrete, reduce the internal and external temperature difference of concrete, and control the generation and
16、development of concrete temperature deformation cracks. In the construction of concrete to reduce the absolute temperature rise value, speed is the core of the concrete temperature down through the 1m3 test volume than experiments with large volume concrete blocks, choose the fast increase of strength, low hydration heat of concrete mix, and additive, improve crack resistance of concrete itself, and the deep groundwater control of
