Large-span concrete beam multi-point continuous measurement device and measurement method

Abstract

The invention discloses a large-span concrete beam multi-point continuous measurement device and a measurement method. The device comprises an inner fixed point type strain optical cable, a reinforcement cage and an optical fiber and optical cable demodulator, wherein the inner fixed point type strain optical cable is bound on a main reinforcement of the reinforcement cage and is poured into the concrete beam; the inner fixed point type strain optical cable is connected to the optical fiber and optical cable demodulator; the internal fixed point type strain optical cable comprises an optical cable inner core, internal fixed point FBG sensors, an optical cable sheath, an armor tube and a steel strand. The plurality of internal fixed point FBG sensors are uniformly distributed in the opticalcable inner core and are wrapped in the armor tube; the optical cable sheath wraps the armor tube wound with the plurality of strands of steel strands; the number of the inner fixed point FBG sensorsof a single inner fixed point type strain optical cable reaches 2000, and multi-point dense continuous testing of a large-span concrete structure is achieved. The temperature sensing optical cable and the inner fixed point type strain optical cable are symmetrically distributed up and down along the main reinforcements of the reinforcement cage; the optical fiber and optical cable demodulator canobtain a plurality of data at the same time, thereby achieving the monitoring of the internal force, bending moment and deflection of the concrete beam.

Description

technical field [0001] The invention relates to the monitoring field of long-span concrete beams, in particular to a multi-point continuous measuring device and a measuring method for long-span concrete beams. Background technique [0002] Optical fiber sensing technology is a new type of sensing technology that uses light as the carrier and optical fiber as the medium to perceive and transmit external signals, which developed rapidly with the development of optical fiber and optical fiber communication technology in the 1980s. It is used in all aspects of civil engineering. [0003] At present, for the traditional monitoring of long-span beam structures in large-scale hub structures, point strain gauges, electromagnetic induction or manual inspection methods are generally used. The shortcoming that it is difficult to guarantee the safe operation of personnel. Compared with traditional conventional sensors, optical fiber sensing technology has good anti-electromagnetic int...

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Problems solved by technology

[0003] At present, for the traditional monitoring of long-span beam structures in large-scale hub structures, point strain gauges, electromagnetic induction or manual inspection methods are generally used. Disadvantages that it is difficult to guarantee the safety of personnel

Compared with traditional conventional sensors, optical fiber sensing technology has good anti-electromagnetic interference ability, can realize large-scale and long-distance real-time monitoring, avoid the irrationality of human experience judgment, and greatly reduce missed detection and false alarm The probability of providing timely and accurate important information; but at present, fiber gratings are mostly packaged into single-point strain gauges, which can only detect one area, and are not suitable for continuous measurement of multiple points on long-span beams.

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