PCCP strain testing method based on fiber bragg grating strain sensing technology

Abstract

The present invention relates to a prestressed concrete cylinder pipe (PCCP) strain testing method based on fiber bragg grating (FBG) strain sensing technology. The PCCP strain testing method comprises the steps of S1: measuring point arrangement by uniformly arranging FBG strain gauges on the inner wall of cylinder core concrete on the inner side of a steel cylinder, the outer wall of the steel cylinder, the cylinder core concrete outside the steel cylinder, prestressed steel wires and the protective layer mortar, using large-range patch-type strain gauges and serially connecting the FBG strain gauges, wherein the FBG strain gauges on the inner wall of cylinder core concrete on the inner side of a steel cylinder and the FBG strain gauges on the outer wall of the steel cylinder are serially connected through laying fiber leads; S2: fiber lead wire integration by introducing the end portions of all fiber leads into a junction box of the PCCP, conducting test wire integration and leading the integrated fiber leads outside the PCCP; S3 pouring glue to seal the junction box and conducting waterproofing treatment. The method ensures the advantages of anti-electromagnetic interference characteristics, good durability and high precision.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering testing, in particular to a strain testing method for a prestressed steel cylinder concrete pipe (PCCP) based on an optical fiber grating strain sensing technology. Background technique [0002] Prestressed steel cylinder concrete pipe (PCCP pipe) is composed of concrete core, steel cylinder, prestressed steel wire and protective layer mortar. PCCP pipe has the advantages of strong bearing capacity, basically no water leakage, not easy to corrode, convenient and fast installation, strong water flow capacity, good adaptability to the foundation, strong earthquake resistance, rich accessories and special-shaped pipes, etc. It is widely used in municipal engineering It is widely used in nuclear power, hydropower and long-distance large-caliber pressurized water pipeline projects. [0003] The strength of PCCP pipe depends on the prestressed steel wire wound on the tube core. Th...

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Problems solved by technology

However, resistive strain gauges are easily damaged during the manufacturing process of PCCP pipes, and have insurmountable defects such as poor stability and prone to zero drift.

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