Source: 丨Construction Times
In the past seven years, Xiong'an New Area has grown jointed, realizing a gorgeous butterfly change from "a piece of land" to "a map" to "a city". The 38-square-kilometer start-up area continues to be "in full swing", and key projects outline the new outline of the new city.
Recently, the main structure of the Sinochem Headquarters Building project undertaken by the Third Company of China Construction Second Bureau has been capped, which marks that the Sinochem Headquarters Building is about to enter the secondary structure construction stage. The overall project is expected to be completed in the first half of 2025, and after completion, it will promote the gathering of various resource elements in Xiong'an New Area, promote the deep integration of talent chain, industrial chain and capital chain in Xiong'an New Area, and help the construction of Beijing's non-capital function relief and centralized carrying area.
205 cast-in-place piles
Make the building as stable as a "rock"
Q
As the "tallest building in Xiong'an", how to reflect the characteristics?
A
In terms of conceptual design, the project takes the shape of Xiong'an's characteristic "golden reed", implying endless growth and jointed growth.
As the "tallest building in Xiong'an", the project adopts the characteristic "golden reed" shape of Xiong'an in terms of conceptual design, implying endless growth and jointed growth.
During the underground construction phase, 205 concrete piles with a diameter of 1 meter and a length of 70 meters were installed under the raft slab of the main building. These piles, which are equivalent to 23 storeys high, are firmly driven into the soil like a "Dinghai God Needle". After the pile is formed, the high-pressure grouting is carried out through the grouting pipe pre-embedded at the bottom and side of the reinforcement cage, and the grout is closely combined with the soil around the pile through infiltration, splitting, filling, compacting, etc., so as to lay a solid foundation for the flourishing growth of "Golden Reed".
Since the construction area is only 800 meters away from the Baiyangdian water system, the abundant groundwater resources in the local area have brought problems such as foundation pit drainage and structural anti-floating to the project construction, and serious erosion will lead to damage to the concrete structure and affect the use of the entire building. The technical team of the project kept a close eye on the important processes, tracked the development of the whole process, and selected the waterproof curtain and steel sheet piles to carry out the construction in groups and sections during the "water period", so as to "prescribe the right medicine" to block the external water inflow and ensure the safety of the construction;
16 framed columns
Putting on a "golden bell jar" for the building
Q
How do you ensure that your project is fulfilled flawlessly?
A
The project has a professional technical staff and modeling team to ensure that there are zero errors in the construction design of the project.
The plan layout of the tower is octahedral and the overall façade is golden reed-shaped. In order to ensure the stability of the overall shape and structural structure of the project, the outer frame of the tower is set up with 16 oblique steel tube concrete giant columns, and the cross-section of the steel columns is special-shaped hexagon.
98 cross-sectional sizes, 15 steel structure plate specifications, the cross-sectional size of the outer frame column has been reduced from the bottom 1.4 m * 1.4 m to 80 cm * 80 cm. At the same time, in terms of the thickness of the steel structure plate, the thickest steel column plate is 80mm, the thinnest is 25mm, and a total of 2088 sections need to be assembled and welded at high altitude, which adds high difficulty to the precision control of the entire outer frame column installation.
Since the planning stage of the project, a 3D modeling team has been set up to model each frame column, each frame column steel structure, each frame steel beam, and each connecting plate one by one, and a unique "ID card" is tailored for each steel column, which can track the installation process of each steel column at any time, greatly improving the quality and efficiency of the project.
Hyperbolic shaped tower crown
Embedding "peony flowers" for the building
Q
As the finishing touch of the project as a whole, how to present the hyperbolic special-shaped tower crown shape like a "peony flower"?
A
Through step-by-step construction, on-site accurate lofting and verification to ensure that the tower crown "peony" blooms brightly!
Walking into the wisdom experience center of Sinochem Headquarters Building, the overall shape of Sinochem Building displayed in the sand table is pagoda-shaped, and at the top of the building, a hyperbolic special-shaped tower crown shape like a "peony flower" can be seen at the crown of the tower. The intersection nodes of the whole tower crown are complex, the span is large and most of them are curved structures, and the support points cannot be found for the positioning of hyperbolic components, so the construction is extremely difficult.
In order to solve the problem of the tower crown construction project to the tower crown steel beam at the intersection of the sectional treatment, according to the peony flower modeling, the tower crown steel beam is divided into "stamen" steel beam, "petal" steel beam, "petal" auxiliary steel beam, tower crown center support column, tower crown crown top support column. The finite element force analysis of the entire tower crown and support was carried out to find the optimal solution for the support position of the round pipe flange.
The installation of the whole tower crown is divided into 6 steps: crown top support column round pipe support erection, "petal" steel beam round support column erection, crown top support column installation, petal steel beam installation, "petal" auxiliary steel beam installation, round pipe support dismantling 6 steps, and the whole steel beam adopts 3D modeling technology, it is necessary to step by step construction, step by step check, deepen the angle coordinates of each section of steel beam, and ensure that the tower crown "peony" blooms brightly.