Large-section truss type steel structure bridge construction method

Abstract

The invention relates to the technical field of bridge construction, in particular to a large-section truss type steel structure bridge construction method, which comprises the following steps: S1, firstly, constructing a lower structure of a bridge, including a bridge abutment for supporting an upper structure of the bridge, a bridge pier and a foundation for bearing downward transmission pressure of the bridge abutment and the bridge pier; S2, constructing and building an upper structure of the bridge, wherein the upper structure comprises a bearing structure and a bridge floor; and S3, prefabricating a bearing structure. The construction method is provided for solving the technical problem that in the construction process of the large-section truss type steel structure bridge, the large-section truss type steel structure bridge cannot be in position in one step, the technical problem that the large-section truss type steel structure bridge is difficult to erect in position in one step is solved, and the method is easy and convenient to operate, high in speed, high in truss beam assembling efficiency, accurate in alignment, light in self weight of structure, and high in spanning capacity, and compared with a traditional steel truss, the structure is simple in structure, low in steel consumption, large in overall rigidity, good in joint performance and convenient to apply prestress.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for a large-section truss type steel structure bridge. Background technique [0002] At present, the main forms of bridge construction in China are prestressed concrete structures, steel trusses, and steel box girder structures, while steel tube concrete structures and steel tube frame structures are also widely used in existing bridge construction projects. Although the above-mentioned bridge structures have many advantages and are suitable for different bridge construction environments, these structures also have some relatively large defects. For example, prestressed concrete box girders cannot meet the needs of long-span bridges due to their low specific strength of structural materials (material strength / material bulk density), the dead load accounts for a large proportion of the total load, and the utilization efficiency of bearing capacity...

AI Technical Summary

Problems solved by technology

For example, prestressed concrete box girders cannot meet the needs of long-span bridges due to their low specific strength of structural materials (material strength / material bulk density), the dead load accounts for a large proportion of the total load, and the utilization efficiency of bearing capacity is low. In practice, in order to reduce the self-weight, the web of the bridge usually needs to be equipped with a large number of prestressed steel bars, so that the construction requires a large number of complex mechanical equipment, and the construction site is large and the construction period is long

However, steel beams use a large amount of steel, the overall rigidity of the structure is small, and the joint structure is complex. In addition, the performance of the joints is not guaranteed, the safety factor is low, and maintenance measures such as reinforcement are required on a regular basis. pressure is not economical

For the steel box girder structure, the steel consumption is also large, and the welding requirements are high, which is not convenient for on-site fabrication, assembly and erection, and is not suitable for construction in mountainous and canyon areas.