100 help plan
The building area is 94,937m2, the building height is 60m, the number of floors above ground is 13, and there are 3 floors underground.
Structural form: podium: steel frame system, north and south towers: steel frame + concrete core tube system;Floor structure form: underground: concrete floor slab, aboveground: steel truss floor deck, corridor structure form: truss structure (span 33m), structural safety level: grade II, design life: 50 years, building fire resistance grade: grade I seismic fortification intensity: 8 degrees;Dimensions: 139mx102m
The total steel consumption of the project is 9600t, and the main steel components are "H" shaped steel columns and beams, box beams and columns, bearings, steel trusses, special-shaped "cross" steel columns, etc. The components are mainly bolt welded.
The column base of this project is connected with concrete by anchor bolts. The beam-column connection is all non-corbel bolt welded connection, and the main and secondary beam connections are connected by high-strength bolts.
The corridor is composed of four steel trusses, and all of them are welded on site, except for some secondary beams and connecting beams that are bolt-welded. One side of the corridor adopts a sliding bearing, and one side adopts a hinged bearing.
The installation of the high-altitude corridor is difficult, and the high-altitude corridor is located directly above the podium roof, and the roof design load does not meet the overall lifting requirements. The high-altitude loose tire frame cannot be supported directly from the ground, and it is difficult to install the corridor.
Selection of fireproof materials for steel columns.
The project is a first-class project, the overall decoration is relatively simple, and after the completion of the fire prevention construction of the steel column, putty coating construction is required. After the construction of conventional fireproof coating is completed, the surface flatness is poor, can not meet the requirements of the coating base, so the selection of a fireproof material that meets the fireproof requirements by taking into account the decoration effect is a difficult point in the construction of the project.
The nodes are complex and diverse, deepening, and difficult to process.
There are cross-section joints of rigid structures, beam-column joints of podium steel frames, and box-shaped column joints of composite structures. A variety of complex nodes such as the corridor bearing steel platform, the corridor bearing corbel and the variable section beam connection node are difficult to deepen and process.
The steel structure hoisting accuracy is required to be high.
Beam-column connection is all non-corbel connection node, and construction precision control requirements are high, and the component is in place, and the installation is difficult, and the hoisting equipment occupancy rate is high.
Quality control of welds for winter construction.
Due to the tight construction period, according to the requirements of the general control progress node, the main structure part of the third section, the fourth section of the column and the standard layer 7 to 11 layers of steel beam construction into the winter construction, there are more than 3,300 winter welds on the site, and the welding quality is directly related to the safety of the main structure, which is the focus of the quality control of this project.
Deepen design management.
In view of the complex and diverse joints, deepening and difficult processing, the project adopts TEKLA software for deepening design, and BIM accurately modeling and lofting to ensure the processing accuracy and quality of components.
Construction site planning.
An M125 tower crane and a 220T crawler crane are set on the west side of the site, and an 8039 tower crane is set up on the east and south sides.
Rigid structure installation.
The underground steel structure follows the progress of civil construction and is divided into 8 construction flow areas.
Steel frame structure installation.
In view of the problems of beams and columns without corbel connection nodes, high installation accuracy requirements, and high occupancy rate of lifting equipment, the virtual pre-assembly technology is used to accurately locate the components during processing, and the code plate is welded on the steel column in advance, and the installation is directly in place during on-site installation, so as to improve the installation accuracy and reduce the occupancy rate of lifting equipment.
Steel corridor. It is difficult to install the corridor above the roof. The site adopts the independent innovation "steel corridor roof ultra-high bracket installation technology" for installation. Roof erection tower crane section as steel structure loose super-high support, roof steel beam pre-welded embedded parts, and in the support arrangement point steel beam below the arrangement of reinforcement steel diagonal brace. The support frame is provided with I-beam attachment, and the top of the support frame is welded and fixed with the conversion platform with a long section of steel.
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