Long-acting anti-corrosion method for lined type prestressed concrete cylinder pipe

Abstract

The invention discloses a long-acting anti-corrosion method for a lined type prestressed concrete cylinder pipe. According to the method, ultra-high-performance concrete with high deformation capacity is adopted for bonding covering and to protect a steel cylinder, prestressed wires, a socket steel ring and a spigot steel ring against corrosion, and used for protecting a concrete liner. The ultra-high-performance concrete used in the method has excellent physical and mechanical properties which include the high deformation and crack resistance capacities, high tensile strength, high bonding strength, high toughness, high permeation resistance, high chemical corrosion resistance, high freeze thawing resistance and ultra-high durability, and can provide reliable and long-acting corrosion resistance protection for the lined type prestressed concrete cylinder pipe, the durability and operational reliability of the lined type prestressed concrete cylinder pipes are greatly improved, and the expected long working life (75 years to 100 years) of a pipeline laid with the lined type prestressed concrete cylinder pipes is guaranteed and realized.

Description

technical field [0001] The invention relates to a long-term anti-corrosion method for lined prestressed steel cylinder concrete pipes, especially the use of ultra-high performance concrete with high deformation capacity to protect the steel in the pipeline from corrosion for a long time and to protect the concrete lining in the corrosive environment Free from sewage corrosion. Background technique [0002] Prestressed Concrete Cylinder Pipe (PCCP for short) is a water pipe that originated in France. It began to develop in Europe and the United States in the 1940s, and began to develop and apply in China in the 1980s. [0003] PCCP is composed of a high-strength concrete tube core with a steel cylinder wrapped with prestressed steel wire, and then sprayed with a cement mortar protective layer; the steel socket and the steel cylinder are welded together, and the groove on the socket and the rubber ring form a sliding type flexible connector. PCCP is divided into lined prestr...

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Problems solved by technology

[0022] In the above method, the polypropylene fiber can only improve the crack resistance of the mortar in the hardening stage, that is, prevent or reduce the plastic shrinkage crack of the mortar; the polypropylene fiber cannot improve the crack resistance of the hardened mortar because its elastic modulus is too low to restrain the hardening cracks in the mortar; moreover, this method did not improve the impermeability and corrosion resistance of the mortar

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