Improved manufacturing method of prestressed concrete cylinder pipe

Abstract

The invention discloses an improved manufacturing method of a prestressed concrete cylinder pipe, which, besides the four processes of making a steel cylinder, forming a concrete cylinder pipe core, winding prestressed steel wire on the pipe core and making a concrete mortar protective layer outside the steel wire, also comprises: spraying a layer of liquid epoxy resin on the prestressed steel wire while winding the annular prestressed steel wire; and roll-jetting concrete mortar outside the epoxy resin which is not solidified, and thus, accomplishing the manufacturing of the protective layer. The method improves the anticorrosion performance of the prestressed steel wire and the strength of the concrete mortar protective layer coated outside, simplifies production process and shortens production period.

Description

technical field [0001] The invention relates to the manufacturing technology of large-aperture steel skeleton concrete prefabricated pipe components in water conservancy facilities, in particular to the improved manufacturing method of prestressed steel cylinder concrete pipes. Background technique [0002] Prestressed steel cylinder concrete pipe, or PCCP for short, is mainly used in large-scale water conservancy transportation projects. In the known technology, the production process includes four major processes: steel cylinder production, concrete tube core molding, circumferential prestressed steel wire wrapped around the tube core, and cement mortar protective layer outside the steel wire. The national standard GB19685-2005 stipulates that a layer of cement slurry should be sprayed while winding the hoop prestressed steel wire, that is, the first time the slurry is sprayed, the purpose is to prevent the exposed prestressed steel wire from being corroded by water or air...

AI Technical Summary

Problems solved by technology

[0004] With the wide application of PCCP, for overhead or buried PCCP pipelines, in order to prevent the corrosion of prestressed steel wires caused by the penetration or diffusion of corrosive factors in the air or soil environment, for PCCP after the above four steps are completed, sometimes it is necessary to re-install Spray a layer of shielding materials such as epoxy coal tar pitch paint or polyethylene anti-corrosion layer on the outside of the protective layer to improve the anti-corrosion performance of PCCP prestressed steel wire. This process is quite time-consuming and labor-intensive, and it also increases the production cost of the product.