A positioning device and construction method for prefabricated longitudinal full-length prestressed tunnels in short-line method box girder segments

Abstract

The invention discloses a short-line-method box girder section prefabricated longitudinal full-length prestressed duct positioning device, and meanwhile discloses a method for positioning constructionby utilizing the positioning device. The short-line-method box girder section prefabricated longitudinal full-length prestressed duct positioning device is characterized in that the positioning device comprises steel pipes (1); the end diameters of the steel pipes (1) are gradually decreased; the outer diameters of the steel pipes (1) are R, and the end diameters of the steel pipes (1) are 0.3 R;PE pipes (2) are arranged outside the steel pipes (1), and the steel pipes (1) and the PE pipes (2) together form liner pipes; the PE pipes (2) are movably connected into corrugated pipes (3) in a penetrating mode, wherein the corrugated pipes (3) are buried in concrete; and anchor plates (4) and spiral steel bars (5) are arranged at the ends of the corrugated pipes (3).

Description

technical field [0001] The invention relates to the field of prefabricated construction of large concrete beam segments, in particular to a positioning device for prefabricated longitudinal through-length prestressed tunnels of box girder segments by a short-line method, and a construction method for positioning by using the device. Background technique [0002] The side-span concrete girders of large-scale composite girder cable-stayed bridges have large spans and large volumes. Using the "short-line method segmental prefabricated assembly process" for construction can reduce the hydration heat effect of mass concrete overall pouring and improve the quality of the structure. At present, most of the concrete box girders commonly used in the world are spatially prestressed concrete structures, and the longitudinal internal beams are prestressed threaded steel bars for the entire length. When assembling segments, they need to be lengthened segment by segment, requiring high pos...

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Problems solved by technology

[0003] The present invention aims to solve the above-mentioned deficiencies in the prior art, and proposes a prestressed channel positioning device with simple, convenient and low cost construction, and also discloses a construction method for positioning by using the device, which can improve the concrete box The positioning accuracy of the prefabricated longitudinal full-length prestressed tunnel in the beam segment can solve the problems caused by the positioning method during the construction of the prestressed tunnel. The tunnel structure is not straight, the positioning is not accurate, and the construction quality is poor, and the construction efficiency is effectively improved.

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