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Achieving Efficiency in the Timely Completion of the Safety-Critical Demolition Project for Dazhou Fertilizer Plant by Ningbo Engineering / Author/Source: Sinopec News Network Date: June 5, 2020 Clicks: 16 On May 25, the work of removing the internal components of the granulation tower in the Dazhou Fertilizer Plant demolition project carried out by Ningbo Engineering’s Storage, Transportation and Installation Branch was completed successfully, 5 days ahead of the original deadline of May 30. The demolition of the granulation tower in this project, which has a total height of 89 meters and a diameter of 22 meters, was listed as one of Ningbo Engineering Company’s top ten high-risk tasks for the year. It is also considered a major risk control project for the Storage, Transportation and Installation Branch in 2020. On April 25, the demolition work of the granulation tower was officially launched. According to the construction plan, the first step is to remove the four layers of internal components located at 6 meters, 70 meters, 79 meters, and 85 meters inside the granulation tower. The removal of the internal components is of paramount importance in the overall demolition of the granulation tower, due to factors such as its complex structure, high concrete strength, and the need for work at great heights. To ensure the safety of the work, the project department organized the construction unit to further refine the plan for removing the internal components; excavators were used for demolition at the 6-meter level, while manual demolition methods were employed for the levels between 85 and 70 meters. Furthermore, through on-site JSA analysis, safety ropes were installed at the top of the tower, and 360° circumferential safety main cables along with 4 radial safety main cables were set up at a height of 1.2 meters above the working surface, ensuring that the safety belts of the workers could be attached to both the safety ropes and the safety main cables, thus providing a \"double safeguard\" for belt attachment. During the construction process, there is a cylindrical structure with a diameter of about 6 meters between 70 meters and 79 meters; therefore, scaffolding was erected on the maintenance access road at 73 meters to meet the safety requirements for construction. When removing the structural beams at the 70-meter level, the beams tilted upward as a whole, giving them a hat-like shape, which made it difficult for the demolition workers to move in a radial direction. The project team maintained active communication with the construction unit and installed radial safety cables for each beam; these cables not only provide a point for workers to attach their safety belts but also serve as a point of leverage for radial movement. While dynamically assessing the conditions on site and continuously improving safety measures, the project team also insists on monitoring the health status of the workers on a daily basis: taking their body temperature and blood pressure before work, asking about their rest and physical feelings at night, and recording all this information in detail. During the removal of the internal components of the granulation tower, Ningbo Engineering Company paid close attention to the matter; it installed video cameras on site, had team leaders oversee the inspection work on site, and sent colleagues with extensive experience in safety work to be present at the site in order to further strengthen the safety management of such high-risk operations. The company also connected to the site multiple times via individual combat recorders to conduct safety inspections, and offered encouragement and recognition. Next, the project site will shift its focus to the demolition of the tower walls.