Assembled bridge building technique based on three steel tube longeron segments

Abstract

The invention discloses an assembly type bridge construction process based on three steel tube truss segments. Firstly, the lower part structure of a bridge is built, then the upper part structure of the bridge is built, a plurality of precasting truss segments are erected on the lower part structure in sequence and a bridge bearing structure is formed, and finally a bridge floor is laid to accomplish the bridge construction, the upper boom member and the lower boom member of the truss segment are connected into a whole through a web member, before a plurality of truss segments of the bearing structure are precast and formed, the stress condition of each truss segment is firstly analyzed, according to the stress condition, the truss segments is divided into three types, namely, a hollow steel tube truss segment with the upper boom member and the lower boom member in both which concrete is not required to be filled, a steel tube truss segment with the pressed upper boom member or lower boom member in which the concrete is singly filled, and a steel tube truss segment with the upper boom member and the lower boom member in both which the concrete is filled. The invention has the advantages that the construction process is simple, the stress of the built bridge structure is simple and the application range is wide, the problems of construction, construction cost and engineering quality in the bridge construction can be effectively solved, and the invention has good economic benefit.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to an assembled bridge construction process based on three steel pipe truss segments. Background technique [0002] At present, the domestic bridge construction forms are mainly prestressed concrete structures, steel trusses, and steel box girder structures, and steel pipe concrete structures and steel pipe truss 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, the specific strength of prestressed concrete box girders is small due to the 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, so ...

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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, the steel truss girder uses a large amount of steel, the overall structure rigidity is small, and the joint structure is complex. In addition, the performance of its joints is not guaranteed, the safety factor is low, and maintenance measures such as reinforcement are required on a regular basis. The service life is limited and the steel is completely used to withstand pressure. 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.

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