The hoisting and renovation steps of the arched roof are as follows:
Project Evaluation & Preparation: A comprehensive project assessment is required before any restoration work can begin. This includes a detailed inspection of the existing roof structure, determining the extent and cause of deformation and distortion, as well as assessing possible safety hazards. At the same time, all the necessary construction equipment and materials are prepared to ensure the smooth progress of the construction process.
Demolition of steel structures: Due to the particularity of vaulted roofs, the demolition process of steel structures must be very careful. First of all, use a professional cutting tool to cut off the steel structure joint to ensure that there is no additional damage to the surrounding structure during the cutting process. Then, the cut steel structure parts are lifted off the site one by one using lifting equipment. During the demolition process, special attention is paid to the safety of construction personnel to ensure that all operations comply with safety specifications.
Physical demolition of arches: Relatively complex as it involves the load-bearing and stability of the roof. Before demolition, do a good job of adequate support work to prevent the roof from collapsing suddenly during the demolition process. Then, the arches are gradually dismantled in order from the outside to the inside. In the process of demolition, pay close attention to the changes of the structure, adjust the support mode in time, and ensure the safety of construction.
Renovation & Reconstruction: Design a new vaulted roof structure based on the actual needs of the grain depot and local climatic conditions. Use high-quality steel and advanced welding technology to make new steel structural components. During installation, ensure that the position and angle of each component are accurate to guarantee the stability and aesthetics of the roof. At the same time, the new steel structure is treated with anti-rust and anti-corrosion treatment to prolong its service life.
As for the hoisting and positioning of the arched roof, it mainly involves the selection and use of spreaders. The spreader is mainly composed of booms, wire slings, fixtures and connectors. Lifting equipment generally uses truck cranes. When hoisting, it should be noted that in the transition process of the roof unit plate from the horizontal state to the vertical lifting state, its force and deformation are very complex. Therefore, it is very critical to choose the appropriate hoisting form, and the common ones are two-point lifting, three-point lifting and four-point lifting. The lifting points should be arranged symmetrically along the axis of the arch to avoid tilting the plate due to gravity eccentricity during the lifting process. In the hoisting process, it is also necessary to ensure that the lead in the direction of the resultant force at the lifting point is straight upward, so as to prevent the lifting rope at the lifting point from producing excessive horizontal components, which affects the hoisting safety.
Finally, for the installation and fixation of the arched roof unit panels, the key lies in the first unit panel set. With the assistance of lifting equipment, theodolite is used to correct its installation verticality from different directions perpendicular to each other, and the position of the vault of the unit plate and the vector height of the roof unit plate are checked with a lifting hammer to see if they are correct. After passing the inspection, the arch feet at both ends are fixed with self-tapping screws and connecting angle steel, and then the lifting equipment can be unhooked. The installation and fixing of the rest of the unit board group can be based on the previous group of unit board groups, and after positioning and correction, it is connected with the occlusal edge of the front group unit, and is installed and fixed in sequence. In the process of installation, it is necessary to maintain and correct the verticality of each unit plate group, the position of the vault, the flatness of the ridge line and the parallelism with the longitudinal axis, and solve the problems in time to avoid the gradual accumulation of errors.
Please note that the above steps are for reference only, and the specific construction needs to be flexibly adjusted according to the actual situation. At the same time, it is important to pay attention to safety during the construction process to ensure the safety of personnel and equipment. If necessary, it is advisable to seek the help of a professional construction team.