Large-tonnage prestressed superposed crane beam and construction method
A crane beam and prestressing technology, which is applied in the field of reinforced concrete crane beams, can solve problems such as complex construction technology, complex formwork structure, and poor anti-corrosion performance, and achieve the effects of convenient manufacturing, reduced transportation costs, and high bending rigidity
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[0033] see figure 1 , Figure 5 to Figure 8 , in the embodiment of a large-tonnage prestressed composite crane girder 1 given in the present invention, it includes an inverted T-shaped prefabricated beam part 11 and a T-shaped post-cast concrete part 12, and the two parts are combined to form an I-shaped crane girder 1. The inverted T-shaped prefabricated beam 11 includes a web and a lower flange with equal cross-sections along the longitudinal direction, and pre-tensioned prestressed steel strands 2 are embedded longitudinally in the beam body. Stirrups 3 are embedded in the web of the beam body. The stirrups 3 are exposed to a certain length on the upper surface of the web and embedded in the post-cast concrete part 12. The joint surface of the prefabricated and cast-in-place part is connected with a shear member 41 or 42. Composite beams are used to facilitate batch prefabrication of inverted T-shaped prestressed components in the factory, and pretensioned prestressing tec...
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