【In-depth Discussion on Modular Installation in HaiChuan】Modular Lifting of Key Framework Modules for the Polypropylene Unit in Inner Mongolia Rongxin Chemical’s 800,000-ton Olefins Project

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Improving efficiency, reducing costs, and enhancing quality control – a summary post on [Haichuan Modular Installation Discussion], everyone is welcome to participate in the discussion! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1773168 ------------------------------------------------------------------------------------------------- On April 27th, with the final section of the steel structure module accurately installed, the steam drying framework installation for the 400,000-ton-per-year polypropylene unit of Inner Mongolia Rongxin Chemical’s 800,000-ton-per-year olefin production project – a project undertaken by the Inner Mongolia Rongxin Polypropylene Project Team of the fourth branch – was successfully completed. This marks significant progress in the construction of the core area of the facility, laying a solid foundation for subsequent equipment installation and the smooth commissioning of the plant. It is reported that the steam drying and gas-phase reaction framework are the core key components of this device. The framework is 29 meters long and 16 meters wide, with a building area of 464 square meters and an overall height of 63.5 meters. The main structure is designed with a layered format: the first layer is of concrete construction, while the second layer and above are made of steel structures, with the steel columns having a cross-sectional shape. This framework presents various challenges, including a high overall height, heavy individual components, a large amount of work at heights, and complex construction techniques. The quality of construction and the progress of work are directly related to the overall pace of project development and the successful achievement of key milestones. To ensure the efficient and smooth progress of modular lifting, the project team relies on the proven construction experience from similar projects, and takes into account the characteristics of the project’s frame structure to continuously optimize the specialized construction plan. The entire steel structure is reasonably divided into 4 construction modules, with differentiated construction plans formulated for each area: components in the range of 11.7 meters to 23.7 meters are installed directly in place ； Structures over 23.7 meters in height are disassembled into 3 large modules for pre-assembly on the ground; all modules are assembled, welded, structurally connected, and fitted with auxiliary facilities on the ground, thereby minimizing work at heights. To address issues such as the limited space on the southern cantilevered platform and restricted working conditions, the project team scientifically optimized the construction procedures, thereby effectively reducing the safety risks associated with work at heights. Taking into account the self-weight of the three lifting modules (293 tons, 273 tons, and 204.5 tons respectively), an XLC-type 1250-ton crawler crane was deployed on site to carry out the lifting tasks. By accurately calculating the counterweights and properly positioning the lifting points, a closed-loop control system was implemented throughout the process. Close cooperation and coordination among various specialized teams ensured that the lifting operations were carried out safely and precisely, thereby providing strong support for improving the quality and speed of the project. The successful lifting of this large-scale modular steel structure has fully demonstrated the practicality and reliability of the modular construction method, providing valuable practical experience for the lifting and construction of ultra-high, ultra-heavy, and complex-shaped steel structures. Next, the project team will continue to work hard and overcome challenges, enforce strict control over safety and quality throughout the entire process, accelerate the construction pace steadily, and make every effort to ensure that the project progresses to high standards and is completed and put into operation on schedule.