Large-tonnage prestressed superposed crane beam and construction method

Abstract

The invention discloses a large-tonnage prestressed superposed crane beam, which comprises an inverted T-shaped precast beam part and a T-shaped cast-in concrete part, wherein the two parts are combined to form an I-shaped crane beam; and the large-tonnage prestressed superposed crane beam is characterized in that the inverted T-shaped precast beam part comprises a web plate, wherein the web plate and the bottom flange are uniform sections along the longitudinal direction; a pre-tensioning method prestressed steel strand is longitudinally buried in the beam body; a stirrup is buried in the web plate of the beam body; the stirrup is exposed out of the upper surface of the web plate for a certain length and is buried in the cast-in concrete part; a shear-resistant piece is connected to the joint surface of a precast part and the cast-in-situ part. The inverted T-shaped uniform-section prestressed precast part is manufactured by a long line method in a factory, the die is a standard universal template, the template is low in distribution expense and convenient to manufacture, and because a bottom die is not required on the cast-in-situ part on a construction site, the die is particularly convenient to erect.

Description

technical field [0001] The invention relates to a crane beam of a factory building, in particular to a reinforced concrete crane beam of a factory building with a large-tonnage crane. Background technique [0002] At present, steel crane girders are usually used for large-tonnage crane girders, which consume a large amount of steel, have high cost, and have poor fireproof, rust-proof, and anti-corrosion properties. The prestressed reinforced concrete crane girder is usually prestressed by post-tensioning method. The beam has many specifications and large height. The formwork structure used in its manufacture is complex and has poor versatility. Slow speed and high cost. Also have when crane braking force is bigger, also need establish horizontal steel brake beam, increase cost. A low-cost pretensioned prestressed composite crane beam has not been reported. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the d...

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Problems solved by technology

[0002] At present, large-tonnage crane beams usually use steel crane beams, which use a large amount of steel, high cost, and poor fireproof, rust-proof, and anti-corrosion properties.

The prestressed reinforced concrete crane girder is usually prestressed by post-tensioning method. The beam has many specifications and large height. The formwork structure used in its manufacture is complex and has poor versatility. Slow speed and high cost

In addition, when the brake force of the crane is relatively large, a horizontal steel brake beam needs to be set up to increase the cost.

A low-cost pretensioned prestressed composite crane beam has not been reported

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