Wuhan International Trade Center Building is located in the southwest of the intersection of Jianshe Avenue and Xinhua Road in Hankou. It is a super high-rise comprehensive office building with two floors underground and 55 floors above ground.
Wuhan International Trade Center is located at the intersection of Jianshe Avenue and Xinhua Lane in Hankou, Wuhan Financial Center. The International Trade Building, the commercial annex building (New World Department Store) and the International Trade Xindu (blocks A and B of high-rise apartments with multi-storey garages) form a grand building complex with a total construction area of 210.5 million square meters. The International Trade Building is among the three towns, with a height of 212m. Due to the adoption of a number of high and new technologies in design and construction, the project was identified as the first batch of scientific and technological demonstration projects in China by the Ministry of Construction. The building has 3 floors underground and 53 floors above ground, with a building area of145,000 square meters. Equipped with international trade commodity exhibition center, international business information center, international financial center, senior office, as well as various rooms and facilities for business negotiations, fitness, catering and other public activities. The building structure adopts reinforced concrete tube-in-tube system, and unbonded prestressed multi-ribbed floor is adopted between the inner and outer tubes. At present, the building ranks tenth among the super-high-rise buildings in China and has become a symbol of Wuhan's opening to the outside world.
architectural design
1, confined water dewatering technology for large-area ultra-deep foundation pit in dual-structure stratum without impervious curtain measures
The soil layers in the construction area of Wuhan International Trade Center are: artificial fill, clay, silt silty clay, silt, fine sand and pebbles from top to bottom. There are confined groundwater in the fine sand layer and pebble layer, and the Yangtze River is used as supplementary water source, which is hydraulically connected. The elevation of the confined water head is about-8.0m, which fluctuates with the fluctuation of the Yangtze River water level. The buried depth of the basement floor of Wuhan International Trade Center Building is-16.80 m, and the foundation pit excavation needs to enter the silty sand layer rich in groundwater, and the elevation of the confined water head of the foundation pit should be reduced to below-18.50 m during the floor construction. In the concrete implementation, the following technical measures have been taken:
(1) Different types of groundwater have different treatment methods, and the key point of precipitation is deep confined groundwater. On the premise of retaining the upper groundwater, the dewatering scheme of pumping deep confined groundwater by the whole well is adopted.
(2) Develop dewatering design software, optimize the number and layout of dewatering wells by computer-aided design, and predict dewatering effect and additional settlement of soil layer caused by dewatering.
(3) Improve the structure of dewatering tube well and reduce the sand content of pumping water.
On the premise of effectively controlling the environmental land subsidence, Wuhan International Trade Center Building implemented deep well dewatering with a daily displacement of 30,000 cubic meters.
2. Preparation and pumping technology of large-flow high-strength concrete
The concrete design of Wuhan International Trade Building includes C65-C40, all of which are high-strength concrete with a large amount of concrete. Standard floor 1300 m3 or more, nonstandard floor 1600- 1900 m3, basement floor 1 1000 m3. C60 and C65 high-strength concrete with large flow rate is prepared by making full use of ordinary limestone machine-made macadam in Wuhan area and No.525 ordinary portland cement, which is suitable for slip-form technology and meets the pumping requirements of slump 160-200mm. Vertical pumping and horizontal mechanical distribution are adopted to realize the overall mechanization of concrete pouring.
3. Integral pouring construction technology of super-thick mass concrete
The basement floor of Wuhan International Trade Center Building has a thickness of 3. 10m-4.80m-4.80m, and the total amount of concrete reaches 1. 10000 m3. The design requires C40 concrete to be poured continuously at one time. The key of mass concrete construction technology is to control the absolute temperature rise of concrete and reduce the temperature difference between inside and outside of concrete, so as to control the generation and development of concrete temperature deformation cracks. In construction, the core is to reduce the absolute temperature rise of concrete and slow down the speed of concrete cooling. Through the comparative simulation test of 1m3 mass concrete mixture ratio, the concrete mixture ratio with fast strength growth and low hydration heat is selected, and additives are added to improve the crack resistance of concrete itself. The underground water in deep well is used to control the temperature of concrete leaving the machine and entering the mould, and the concrete surface is covered with plastic film and sacks for heat preservation and moisture preservation, so as to increase the surface concrete temperature and reduce the concrete. At the same time, computer technology is introduced into the application of copper-constantan thermocouple in temperature monitoring, which realizes the dynamic monitoring of mass concrete strength and temperature difference, effectively controls the cooling speed of surface concrete and the temperature difference between inside and outside concrete, avoids the occurrence of temperature cracks, and ensures the engineering quality of basement floor.
4. Synchronous large-area integral hydraulic slipform construction technology of prestressed dense beam floor wall column.
In the integral slip-form construction of prestressed dense beam floor structure with a sliding area of 2300 square meters, the original slip-form construction technology was tackled and innovated, and a series of technical problems in slip-form construction were solved, such as using slip-form technology for horizontal structures such as dense beams of floor structure, integral sliding for vertical structures such as walls and columns, and using high-strength concrete for slip-form construction, which promoted the development of slip-form construction technology. The main innovations of slip-form construction technology are as follows:
(1) The large-tonnage jack (6 tons) and φ 48 steel pipe support rod slide and lift inside and outside the structure, and the tool steel pipe support rod is used outside the structure.
(2) Using industrial television, laser technology and computer technology to realize accurate control and monitoring of slip-form construction.
(3) The construction technology of sliding-pouring-pouring-pouring is adopted, and the beams, walls and columns of large-area floor structure are poured synchronously as a whole.
(4) High-strength concrete is applied to slip-form construction, and vertical pumping and horizontal mechanical distribution are adopted to realize the overall mechanization of pouring concrete.
(5) The construction technology of unbonded prestressed steel strand and slipform synchronization is adopted. Slipform construction of the main structure of Wuhan International Trade Center Building starts from zero meters to the top of parapet. In an effective working day, the sliding mode speed of four days and one floor is created, and the quality of structural construction is excellent.
5. Tapered thread connection technology of steel bar Tapered thread steel bar joint is a kind of mechanical connection joint, which has the characteristics of simple process, fast connection speed, safety and reliability, all-weather operation, no environmental pollution and steel saving. In construction, the taper thread steel bar connection technology is mainly used for vertical or horizontal steel bar connection with a diameter larger than φ 25, so as to speed up the construction.
6. Post-tensioned unbonded prestressed construction technology There are 65,438+044 multi-ribbed beams between the inner and outer cylinders of the main building of Wuhan International Trade Center Building at the floor, and many post-tensioned unbonded prestressed steel strands are used in the beams. When binding the steel bars of multi-ribbed beams, the steel strands are threaded together and fixed with the end plates. When the multi-ribbed beams are constructed by slip form, the steel strands are poured into the concrete. After the concrete strength reaches 100%, the outer tube is tensioned by using the multifunctional scaffold erected on the outer wall. When the tensioning value meets the design requirements, it shall be fixed with anchorage, and the tensioning end shall be closed with concrete according to the design requirements.
7. Integral lifting external scaffolding Integral lifting external scaffolding has the characteristics of flexible operation, low one-time investment and free lifting. The international trade project adopts electric integral lifting external scaffolding, which is mainly used as the operating platform for steel strand tensioning and external decoration engineering.
8. Quick-release independent support system The quick-release independent support system consists of a support rod, a support head and a folding tripod, which has the advantage of convenient installation and disassembly. It is mainly used to support multi-ribbed beam floor, multi-ribbed beam floor and inner tube floor. The use of quick-release system can speed up the cycle of support, formwork and use, and achieve the purpose of reducing investment and increasing benefits.
Wuhan International Trade Center Building
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