On March 30, the main roof project of Terminal 3 of Guiyang Longdongbao International Airport achieved full water closure with the hard work of all participants, and completed the water closure node as scheduled. The leaders of the third-phase expansion headquarters, representatives of various departments, leaders of Dadi Steel Structure and others participated in the water closing ceremony.

          The main roof project of Terminal 3 consists of the corridor and corridor in Area A, the terminal building in Area B and the corridor in Area C, with a total area of 90,000 square meters. Including roof structure system, structural layer system, intelligent skylight system, siphon rainwater system, the total laying material area is 658,000 square meters, and the steel consumption is 288 tons. The smart skylight system uses electrochromic glass with an area of 6,000 square meters. It is the first high-tech product used in domestic airports. The skylight glass can be used for shading or lighting according to the needs of indoor light.

    Affected by special geological conditions, the working face of this project is divided into 22 working faces from the original three major plates, the construction period is changed from 320 days to 60 days for each working face, and the handover time spans from April 2020 to February 2021 . Since the tower crane is installed in the building, it will be dismantled after the civil structure is completed. At the same time, the north side of the east side is affected by the construction of the airfield station apron, and the west side is affected by the construction of the EPC viaduct, so it is not conducive to large-scale construction and rush work.

         It is almost impossible to achieve water closure in 60 days according to the normal construction method, especially the roof of this project is a curved roof, the steel structure is a special shape, and the outer cornice is a hyperboloid aluminum plate. After the keel is installed, the aluminum plates are installed one by one at a high altitude, which not only has low work efficiency and poor safety, but also cannot meet the requirements for the accuracy of the scattered assembly in the air. To this end, the project department uses BIM technology to innovate the construction method to model the primary and secondary purlins and outer cornices of each working face, and then divide them into several units, which are spliced ​​on the ground as a whole to achieve overall hoisting; the outer cornices are also made of aluminum plates. Install and glue on the ground, so that the finished product can be hoisted as a whole and formed at one time. Since a lot of work is done on the ground, the construction quality is improved while the work efficiency is improved, which provides technical support for the completion of the established progress goals.

   Since the start of the roofing project in March 2020, with the efforts of many parties, the impact of the epidemic has been overcome, multiple difficulties have been broken through, and one major project node after another has been successfully completed. On July 15, 2020, the first water closure in the GB2-1-1 area was a complete success; on November 30, 2020, the water in the corridor A was successfully closed; on March 30, 2021, the roof of the main building was fully closed, which was successfully completed The target task assigned by the headquarters.

       Dadi Steel Structure will continue to uphold its original aspiration, adhere to its responsibilities, and shoulder its mission bravely, make every effort to fight the closing battle of the airport expansion supporting project in 2021, and use practical actions to help the rapid development of Guizhou's civil aviation industry and economic society. In order to welcome the centennial of the party, Present the most beautiful and magnificent chapter.