Partial external prestressed and fine-grain reinforcing steel bar fiber reinforced cementitious composite (FRCC) railway box girder

Abstract

The invention discloses a partial external prestressed and fine-grain reinforcing steel bar fiber reinforced cementitious composite (FRCC) railway box girder. The partial external prestressed and fine-grain reinforcing steel bar FRCC railway box girder comprises a hollow beam frame body consisting of a top plate and a webplate, wherein the top plate and the webplate are made from an FRCC material; an anchoring toothed plate and an anchoring diaphragm plate are symmetrically arranged on the two sides of the center in the hollow beam frame body; an anchor is arranged on the anchoring toothed plate; a diverter is arranged on the anchoring diaphragm plate; an external prestressed rib is arranged between the anchoring toothed plate and the anchoring diaphragm plate; and one end of the external prestressed rib is fixed on the anchor, and the other end of the external prestressed rib is fixed in the diverter. At the same time, an external prestressed technique has the advantages that: the partial external prestressed and fine-grain reinforcing steel bar FRCC railway box girder is convenient to construct, detect and change; and the friction loss of the prestressed rib is low, and the like. The webplate of the box girder is shrunk; the strength of the materials used by the box girder is improved; and the FRCC is used for substituting the conventional C50-grade concrete, the bearing capacity of the girder body is not reduced but increased, so that the box girder has an extremely wide application prospect.

Description

Technical field: [0001] The invention relates to a new design method of a railway box girder, in particular to a partially externally prestressed and fine-grained reinforced FRCC railway box girder. Background technique: [0002] In recent years, with the development of high-speed railway technology, viaduct-type lines have been widely used. In the design process of railway box girders, in order to ensure the safety of trains, a design scheme with relatively large girder heights was adopted, resulting in The structure is too heavy, and the use of various materials is too much. In order to offset the excessive self-weight effect, prestressing technology can be used to prevent the tensile stress at the bottom of the beam and prevent the occurrence of cracks. [0003] The existing prestressing technology is the post-tensioning internal prestressing technology, and its main disadvantages are (1) too many prestressing tendons are arranged in the web, and the diameter of the bell...

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Problems solved by technology

The self-weight of the beam body is too large, which affects the hoisting of the structure and wastes materials

(2) The prestressed tendons are all arranged inside the beam body, and the grouting may not be dense, and the prestressed tendons will inevitably be damaged as time goes by, and the inner bundles cannot be inspected, and the disadvantages of replacement will be revealed.

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