Manufacturing method for prestressed steel composite girder

Abstract

A prestressed steel composite girder and a method of manufacturing the prestressed steel composite girder are provided by using a steel beam and a concrete. The method includes steps of: placing the steel beam above the ground; installing a form, into which the concrete is to be inserted, to surround at least a portion of the steel beam, the form being suspended by the steel beam; inserting the concrete into an internal space of the form and curing it; and removing the form to compose the steel beam and the concrete. The prestressed steel composite girder includes a steel beam and a concrete composed to surround a portion of the steel beam so that stress caused by its self- weight can be applied on only the steel beam.

Description

technical field [0001] The present invention relates to a method for manufacturing a prestressed steel composite beam whose lower flange of a steel beam is reinforced with concrete and a steel composite beam manufactured using the method, and more particularly, relates to pre-introducing compressive prestress on the concrete to compensate for normal use. A method for manufacturing a prestressed steel composite beam based on the generated tensile stress, and a steel composite beam manufactured by the method. Background technique [0002] Generally, it is well known in the art that concrete resists compressive stresses but not tensile stresses. Prestressed steel composite beams have been designed to compensate for the tensile stresses that occur when dynamic and static loads are applied for compressive prestressing. [0003] Conventional engineering methods of pre-introducing compressive stress to concrete to provide a resistive section can be classified into the following th...

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Problems solved by technology

[0007] The second traditional technique is to introduce compressive prestress into the concrete through the restoring force of the steel beam only

However, although this manufacturing method solves the problems of the conventional technology, its structure is very complicated

Therefore, the structural cost increases, and in particular, quality control becomes very difficult because it has a construction joint within the lower casing concrete

[0013] In addition, all the above-mentioned conventional methods of manufacturing steel composite beams have the structural problem that the stress caused by the self-weight of the steel composite beam (including the self-weight of the I-beam and the self-weight of the concrete) is used as the tensile stress of the lower flange concrete

[0014] In addition, in all the above-mentioned conventional steel composite beams, since the concrete is subjected to compressive stress of a predetermined strength while the steel composite beam is suspended on the bridge or abutment before the slab is formed, the compressive stress caused by creep deformation is lost over time. loss is inevitable

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