1, project overview 1. 1, component overview The main building structure of local cultural centers has four floors (-6.000 to+17.522) with steel columns (H500-250-20-30 and H500-30) respectively. See the figure below for details of the plane layout of steel-reinforced beam (H500-350-20-30) and steel-reinforced truss (H800-300-20-30(D): 1.2), and the joints of layered steel-reinforced columns of connection nodes are welded. The cantilever beam on the steel-reinforced column and its connected steel-reinforced beam are welded by bolts. For bolt connection, use 10.9S high-strength bolt to connect the pair. 1.3, tower crane parameters Three QTZ40 tower cranes have been installed in the early stage of the construction site. Their position, working radius and lifting capacity parameters are shown in the following figure: 2. Construction difficulties and countermeasures 2. 1 construction difficulties (1) The east and west sides of the main structure of this project are far from the operating point, and the north side is off-road and has high-voltage power supply lines, so these three directions cannot be used during construction. 2) The three tower cranes placed on site cannot meet the unloading and hoisting operations of transportation vehicles with prefabricated steel members of different floors due to the limitations of the placement station, work scope and lifting weight. 3) 13-4/G-4 to D-4 are three-story steel trusses, with a span of 22. 1m, a height of 5. 1m, a total weight of 22.723t, a maximum weight of prefabricated members of 3.766t and a maximum weight of assembled blocks of 7.532t After the transport vehicle enters the site, it stops at the road on the south side of the main building, and the vehicle crane is used for unloading. (2) The steel column and beam hoisting components are transported from the unloading yard to the secondary yard by truck crane. Axis positions of 13-4/ G-4 and D-4; 4-4/ B-4 and C-4 axes; 6-4/ B-4 and C-4 axial steel columns are hoisted from the secondary storage yard to various installation points by tower cranes for hoisting operation, and the rest steel columns and steel beams are hoisted by truck cranes respectively. (3) The steel truss inclined web beam hoisted by the steel truss is prefabricated into a single piece in the factory; The upper and lower chord steel beams are prefabricated into two sections in the factory, hoisted to the site floor, assembled into an integral steel beam, and then installed by decentralized assembly to reduce the hoisting amount of a single piece. The upper chord, the lower chord and the web are hoisted separately, then unloaded on the ground and hoisted to the third floor for the second time with a 220t truck crane; The assembled parts are transported horizontally by rollers and electric hoists. The assembly members are hoisted with herringbone rods (the maximum hoisting height is 8.4m). 3. Construction deployment 3. 1 Organization and management We will appoint someone with similar engineering construction experience as the construction foreman. Unconditionally organize installation and construction according to the schedule and arrangement specified in the package, and all personnel shall accept the management, inspection and supervision of the owner, supervisor and general contractor at any time during the project. 3.2 Safety and civilized construction shall be carried out according to the requirements of civilized construction, and the management of safety helmet and tertiary box shall be carried out according to the provisions of the general contractor. 3.3 Labor Allocation In order to ensure the high-quality and safe completion of this hoisting project, personnel with high professional ethics, strong professional skills, capable, efficient and many years of construction experience will be selected for construction. During the construction, the operators will be adjusted in time according to the construction progress. The labor force allocation of each type of work is as follows: (1) 5 installers (2) 4 riggers (3) 3 welders (4) 2 auxiliary workers (3.4) Technical preparation before construction, organize the construction personnel of each type of work to learn relevant technical specifications and Nanjing technical regulations in advance, be familiar with drawings, and make clear the construction contents, technical requirements, quality standards, construction period and safety regulations. After the workers enter the site, they shall be educated in legal system, safety, fire prevention and civilized construction, learn construction specifications and safe operation procedures, and organize quality standard learning and technical operation disclosure.
For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd