【In-depth Discussion on Modular Installation of Haichuan Chemical Plants】Construction Example–Ethylene Framework of Huizhou Refining and Chemicaling Phase II
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The 4E framework for the cold zone of the 1 million tons/year ethylene plant in Huizhou Refining and Chemicals Phase II project has been installed to high standards. The frame is 46.7 m high and quite large in volume; 4 additional devices need to be installed within it. The 4E steel structure frame has a total weight of 72 tons. To ensure the safety of its construction as well as the proper operation of large cranes, the project employs a modular installation method for steel structures, in order to facilitate the lifting of equipment inside the frame and its smooth installation. Divide the steel structure into two sections: the area below EL121M forms a continuous surface, while the area above EL121M forms a framed structure.
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The project made use of every available opportunity, taking advantage of the free time of the 400-ton crawler crane. To avoid interfering with the overall lifting tasks of the project, the module assembly was carried out in just 5 days; the project team actively mobilized human and material resources and worked overtime to complete the module assembly as quickly as possible. During the technical preparation phase, relevant preparations are carried out by combining drawings, models, and the actual conditions on site. Technicians perform accurate calculations of the module weight based on the Tekla Structures model, with precision down to each diagonal brace ； After the calculations are completed, the lugs are selected and designed based on the weight and the shape of the top of the framework; once the design is finished, it is thoroughly reviewed to ensure that the specifications of the lugs meet the requirements for safe lifting ； The more than 500 components required for the framing were divided down to each level, and a detailed list was prepared; this list was given to the construction workers at the site where the materials had already been treated against corrosion, so that they could select the appropriate components. It was required that all components that could be installed on the ground be installed there as much as possible. At the same time, assign subcontractors to conduct actual measurements of the top of the newly installed column section, in order to prevent misalignment of the bolt holes due to excessive deviations during the connection of the module with the lower frame.
During the process, the dimensions of the connected columns and beams are measured and monitored in real time to ensure accuracy. Since the frame columns are composed of two sections of H-shaped steel connected together with high-strength bolts, to prevent deformation during lifting, the project team conducted thorough discussions with the supervisor and the owner; with their approval, four temporary welds were made around the connection plates at the bolted joints to provide reinforcement. @gn_1984 @RedLee_ZZHI @ZhizheMing @XiaoHeiNiu @StorageAndTransportEngineer @leo_0088
Tekla is very important; it must be used for the frame nodes of this structure.
For steel structures, TEKLA is now required for both detailed design and fabrication. This is also aimed at optimizing installation in order to achieve modular installation; however, modularity is not truly taken into consideration from the design stage onward
TEKLA? It seems we don’t use it very often; for 3D design in the structural engineering field, PDS or PDMS is still used, while STAAD SSDD is employed for steel structure calculations. Is TEKLA used by all installation companies?
All steel structure manufacturing plants use it; it allows for the direct creation of part drawings
Tekla can only be used for steel structures; can it be used for modules with equipment?
Yes, for the detailed design of the structure, all the joints are created using TEKLA; in other words, the structural elements defined in PDMS still require further design work using TEKLA. The structure designed with TEKLA matches what will be built on site. Many collisions that cannot be detected by PDMS occur because the connections between nodes are not detailed enough.
Just borrowing your question: what software is used to create such diagrams?