Implantable concrete three-dimensional space stress monitoring sensor

Abstract

The invention relates to an implantable concrete three-dimensional space stress monitoring sensor, and belongs to the technical field of concrete structure stress monitoring methods. The sensor is characterized in that six outer surfaces of a cubic metal core (1) are symmetrically adhered to three d33 type piezoelectric ceramic plates (3) and three d15 type piezoelectric ceramic plates (4) through AB glue (5), and the six outer surfaces of the cubic metal core (1) and the piezoelectric ceramic plates are coated with high-strength epoxy resin adhesive (6) which is used as insulating layers and waterproof protection layers. A metal protective housing (2) is adhered to the high-strength epoxy resin adhesive (6) layer of each surface of the cubic metal core (1). An end of a three-core shielding wire (7) is welded on the anode and the cathode of the piezoelectric ceramic plate, and the other end is connected with a shielding joint (8). The implantable concrete three-dimensional space stress monitoring sensor can dynamically monitor three-dimensional space stress in a concrete structure, and is small in volume and high in strength. The sensor is characterized by good implantation, good external interference resistance, sensitive dynamic response, and low cost.

Description

Technical field: [0001] The invention relates to an implanted concrete three-dimensional space stress monitoring sensor, which belongs to the technical field of concrete structure stress monitoring methods. Background technique: [0002] Concrete structure has the advantages of high bearing capacity, good durability, and good economy, and is the main structural material used in engineering construction in our country. [0003] In recent years, various natural disasters and man-made accidents have mostly caused serious damage to concrete engineering structures, and some disaster phenomena cannot be well explained from existing theories. Due to the limitations of the objective conditions of the test, it is still difficult to conduct disaster damage tests on prototype concrete structures. Disaster monitoring of engineering structures has become an important means to understand the mechanism of structural damage and failure. At present, the commonly used overall monitoring info...

AI Technical Summary

Problems solved by technology

At present, there are mainly two types of stress sensors made of piezoelectric materials that can be implanted into concrete: cement-based and marble-based; but the shortcomings of these two sensors are mainly: (1) Cement-based sensors are easy to absorb under high stress. Cracking and damage, and the positioning position of the piezoelectric sheet is not easy to ensure; (2) The marble-based sensor is difficult to process and the stone is fragile; (3) The existing cement-based and marble-based stress sensors are only suitable for monitoring uniaxial compressive stress or shear stress , there is no device that can simultaneously monitor the triaxial stress of concrete

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