Graduation practice is an integral part of the whole graduation design teaching plan, and it is also an important practical field of civil engineering specialty. By organizing visits and listening to some special technical reports, we can collect some information and materials related to graduation design, which will lay a solid foundation for the smooth completion of graduation design. Through practice, the following objectives should be achieved:

1, understand the whole design process of general industrial and civil buildings or road and bridge projects;

2. Understand the general layout of the building, the classification and function of the building, the types and characteristics of the structure, the arrangement of structural members and the load transfer route, the details of the main node structure and the treatment methods. ;

3. Understand the construction methods of buildings;

4. Understand the relationship between architecture, structure and construction;

5. Understand the latest trends and development direction in the field of building structure. Engineering innovation and characteristics

⑴ Long span of main bridge: The main span of cable-stayed bridge is 504m, which is the first span of * * * bridge in the world.

⑵ Heavy bridge load: This bridge is the world's first highway-railway cable-stayed bridge built according to the four-line railway, which can bear 20,000 tons of load at the same time and is the largest highway-railway bridge in the world.

⑶ High design speed: This bridge is the first long-span cable-stayed bridge in China's railway passenger dedicated line. The design speed of passenger dedicated line is 200 km/h, and the dynamic simulation design is based on 250 km/h. ..

(4) New structural type: This bridge adopts a new structural type with three main trusses and three cable planes for the first time; The highway deck adopts orthotropic slab or the combined system of concrete and steel truss, and the railway deck adopts the combined system of concrete and steel truss. The main tower is equipped with a large-tonnage hydraulic damping device to limit the longitudinal displacement of the beam.

5. New construction technology: the new technology of precise positioning of prestressed anchor pier of giant double-wall steel box cofferdam is adopted for the first time for the pier foundation of No.2 main tower; The pier foundation of No.3 main tower adopts the floating positioning heavy anchor construction technology of giant double-wall steel hanging box cofferdam; For the first time, a power head drilling rig with torque of 30tm was developed for the construction of φ 3.4m large diameter bored pile.

[6] Construction difficulty: The overall manufacturing, horizontal launching, floating transportation and positioning construction of the giant double-walled steel cofferdam factory with a plane size of 70m× 44m are the first in China, with high technical requirements. The plane positioning accuracy of cofferdam is within 5cm, and the verticality of steel casing is within 1/500; Construction of φ 3.4m large-diameter bored pile in conglomerate with uneven soft and hard cementation: 16000 mass concrete construction and control of square platform: the fabrication and installation of new three main trusses and new plate trusses have high construction precision, strict technical requirements and great construction difficulties; 45 1 φ 7mm long 27 1m galvanized parallel steel wire stay cable fabrication and installation; Vertical construction control of main tower with a height of 188.5m and spatial positioning of cable ropeway pipe: integral cast-in-place construction of large-tonnage box girder with its own weight of 2× 1300 tons. (Research on Bridge Construction Management)