The Jifu building consists of four floors of the basement, five levels of podium building, and 14 floors of the tower above the ground. The total floor area is 59559.3 square meters, 30625.49 square meters on the ground, and 28933.81 square meters under the ground. The main building and skirt room made of the steel frame structure, while the basement is a concrete frame structure—the project expected to complete in June 2019.
All-steel frame structure construction
Compared with those of other sites, the Jifu building did not erect the scaffolding structure at the construction stage. The project director said: “The primary scaffolding role is operating platform and peripheral. When conventional high-rise reinforced concrete structure construct, every type of workers need specific operating space and ensure the safety protection in place, so you must set up the scaffolding. The superstructure of the jifu building project is all steel frame structure, and the steel frame structure quickly hoisted into shape. During the hoisting operation, life rope and horizontal isolation set up according to the standard requirements, and the protective railings set up time, so there is no need to set up the outer scaffold when the safety measures are in place.
The advantage of steel frame structure
The steel frame structure of this project has a large lifting capacity, and a total of 6,500 tons of steel structure is adopted. One steel frame tower crane is installed in the tower and the podium area, respectively. Under the condition of limited site operation conditions, the project department completed all lifting tasks within less than three months.
When first saw the Jifu building, I always felt that it was different from other buildings, which was not so neat. Other buildings in the expo area were mostly square and upright, while the Jifu building was separate. The outer boundary line of the building expanded gradually from bottom to top, and the outer contour of the building was circular.
As a foreign investment, the owner of the building itself has a unique insight. The owner wants the net height inside the level to be as high as possible, which means that the mechanical and electrical pipeline should be rearranged and optimized, and even the structural parts should be optimized.
Because of the high standard requirements of the owner, the general contracting project department adopts BIM technology to realize the overall control of the project. It examines two-dimensional drawing problems through BIM 3d technology to make involved nodes visible and guide the site construction.
As a four-story bottomless foundation pit with a maximum depth of 25 meters, the foundation pit construction is also one of the significant difficulties in the development of Jifu building.
High requirement of waterproof
At the same time, the owner of the basement waterproof effect request is particularly high.
Because the basement floor height is above 4m and the highest altitude is up to 7.5m, the lateral pressure of the external wall of this structure is enormous. The project department has prepared a particular plan and passed the expert demonstration, which further improves the overall waterproof effect of the project basement under the guarantee of safety.
The Jifu building project covers only 7,587.9 square meters, while the foundation pit covers an area of 6,500 square meters. The outer boundary line of the foundation pit is highly overlapping with the red building line. It is the difficulty and challenges that accompany the construction of the project to the current top of the structure until completion.
Through the careful construction and management of the project team of the general contracting department of the Shanghai construction industry, the Jifu building project has won the honorary titles of Shanghai civilized construction site, Shanghai star construction site, and Shanghai popular construction site in 2017.