A structure detection device and a structure detection method based on optical fiber sensing technology

Abstract

The application discloses a structure detection device based on an optical fiber sensing technology, which comprises the following steps: firstly, auxiliary laying mechanisms are installed on the stirrups of the steel reinforcement framework of a plurality of column reinforced concrete structures, so that sensing optical fibers pass through the limiting sleeves of the auxiliary laying mechanisms and are fixed by locking structures after being tensioned; when the concrete is solidified or subjected to external loads, the sensing optical fibers will be deformed synchronously with the surrounding concrete, and the strain generated by the sensing optical fibers is the strain value of the concrete; an optical fiber sensing detection unit receives optical signals sent by the sensing optical fibers, analyzes the optical signals, obtains temperature information data of each part of the optical fibers, sends the temperature information data to a real-time data analysis processing unit, and a data analysis unit analyzes index parameters of the column reinforced concrete structures. The application further discloses a structure detection method of the structure detection device based on the optical fiber sensing technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structure detection, in particular to a structure detection device and method based on optical fiber sensing technology. BACKGROUND

[0002] Distributed optical fiber sensing technology is mainly based on the reflection and interference of light, and uses the changes in light scattering or nonlinear effects in optical fibers caused by external environment to perform sensing. According to the different measured light signals, distributed optical fiber sensing technology is divided into three types based on Rayleigh scattering, Raman scattering and Brillouin scattering in optical fibers; according to the signal analysis method, it can be divided into distributed optical fiber sensing technology based on time domain and frequency domain. In the distributed optical fiber sensing system, the optical fiber is both an information transmission medium and a signal sensing unit. In the system, the whole optical fiber is a sensing unit, and the sensing points are continuously distributed, so this sensing method can measure the information at any position along the optical fiber. With the development of optical devices and signal processing technology, the maximum sensing range of the distributed optical fiber sensing system has reached tens to hundreds of kilometers or even tens of thousands of kilometers. The research and application of distributed optical fiber sensing technology has been highly valued, and it has become an important research direction of sensing technology.

[0003] Therefore, the structure detection device based on optical fiber sensing technology is particularly suitable for detecting the temperature, vibration and stress of the reinforced concrete structure. It can monitor the health parameters of the reinforced concrete structure throughout its life cycle, and can monitor the temperature changes, pressure load conditions, vibration deformation conditions, and cracks and defects of the reinforced concrete structure caused by environmental erosion and material aging.

[0004] The structure detection device based on optical fiber sensing technology involves the laying of sensing optical fibers during use, which can be laid by grooving on the reinforced concrete structure, pasting on the surface of the reinforced concrete structure, or pre-laying before pouring concrete. For example, the Chinese patent with the application publication number CN110696179A and the application publication date of January 17, 2020 discloses a method for laying sensing optical fibers in concrete, which selects the laying section of the sensing optical fibers, then fixes the sensing optical fibers on the steel reinforcement framework along the direction of the steel reinforcement framework in the laying section, and finally starts the concrete pouring construction after the sensing optical fibers are laid. When fixing the sensing optical fibers, a plurality of hanging rings are fixed on the steel reinforcement framework, and the sensing optical fibers are fixed by passing through the hanging rings.

[0005] However, for the column type reinforced concrete structure, the internal steel framework mainly includes a plurality of standing bars and a plurality of stirrups sleeved on the standing bars and fixed, at this time, when the sensing optical fiber is laid, if the sensing optical fiber is directly laid on the steel framework, it is difficult to detect various parameters at the middle position of the reinforced concrete structure, if the sensing optical fiber is laid in the middle of the reinforced concrete structure, the fixing mode of the sensing optical fiber is also a problem to be solved urgently. SUMMARY

[0006] The purpose of the present application is to provide a structure detection device based on optical fiber sensing technology, which can realize the function of laying sensing optical fiber in the middle of column type reinforced concrete structure.

[0007] The above technical purpose of the present application is realized by the following technical scheme: a structure detection device based on optical fiber sensing technology, comprising a sensing optical fiber, an optical fiber sensing detection unit, a real-time data analysis processing unit, a plurality of auxiliary laying mechanisms for laying the sensing optical fiber, the sensing optical fiber is used to lay in the column type reinforced concrete structure, the optical fiber sensing detection unit is used to receive the optical signal sent by the sensing optical fiber, analyze the optical signal and obtain the temperature information data of each part of the optical fiber, and send the temperature information data to the real-time data analysis processing unit, the auxiliary laying mechanism comprises a limiting sleeve through which the sensing optical fiber passes, at least two arc-shaped sliders arranged on the limiting sleeve along the center line circumference of the limiting sleeve, a steel wire rope arranged at one end of the arc-shaped slider, a winding device arranged at the other end of the steel wire rope and realizing winding and unwinding of the steel wire rope, a metal spring buckle sleeve arranged on the winding device and realizing buckling on the stirrup of the steel framework, a locking structure arranged at the lower end of the limiting sleeve, the locking structure simultaneously fixes or unlocks the arc-shaped slider and the sensing optical fiber; along the length direction of the steel framework of the column type reinforced concrete structure, a plurality of auxiliary laying mechanisms are arranged to make the sensing optical fiber pass through a plurality of limiting sleeves along the vertical direction.

[0008] By adopting the technical scheme, the reinforcing bars of a plurality of column reinforced concrete structures are first selected to install the auxiliary laying mechanism on the stirrups, the sensing optical fiber passes through the limiting sleeves of the plurality of auxiliary laying mechanisms, and is fixed by the locking structure after being tensioned; when the concrete is solidified or subjected to external load, the sensing optical fiber will deform synchronously with the surrounding concrete, and the strain generated is the strain value of the concrete; the optical fiber sensing detection unit receives the optical signal sent by the sensing optical fiber, analyzes the optical signal, obtains the temperature information data of each part of the optical fiber, sends the temperature information data to the real-time data analysis processing unit, and the data analysis unit analyzes the index parameters of the column reinforced concrete structure; meanwhile, when the auxiliary laying mechanism is used, the position of the metal spring buckle on the stirrup can be adjusted, and the length of the two steel wires between the winder and the arc-shaped slider can be adjusted, so that the position of the limiting sleeve can be adjusted according to the actual detection needs, and the position of the sensing optical fiber can be adjusted; in addition, the arc-shaped slider is circumferentially slidably connected to the limiting sleeve, and the metal spring buckle can also be installed on the required reinforcing bar of the reinforcing bar frame according to the needs, thereby improving the installation and adaptation range.

[0009] Further provided in the application is that the lower surface of the limiting sleeve is provided with an external threaded pipe, the locking structure comprises a locking threaded sleeve threadedly connected to the external threaded pipe, and a metal locking ring sleeved around the sensing optical fiber and abutting against the end of the external threaded pipe, the outer diameter of the metal locking ring gradually decreases in the vertically downward direction, the inside of the locking threaded sleeve is provided with an annular inclined surface for abutting against the sensing optical fiber after the metal locking ring is deformed during the tightening of the locking threaded sleeve, and the annular inclined surface is matched with the outside of the metal locking ring; the lower surface of the limiting sleeve is provided with a first annular groove, the first annular groove is provided with a circular tooth groove, the upper surface of the locking threaded sleeve is provided with a second annular groove corresponding to the first annular groove, the upper surface of the arc-shaped slider is provided with an arc-shaped gear rack portion embedded in the first annular groove, and the lower surface of the arc-shaped slider is provided with an arc-shaped embedded portion embedded in the second annular groove; during the complete tightening of the external threaded pipe, the arc-shaped gear rack portion is gradually embedded in the tooth groove for engagement and fixation.

[0010] By adopting the technical scheme, after the sensing optical fiber passes through a plurality of limiting sleeves, the sensing optical fiber between the two limiting sleeves is in a straightened state by the locking structure, and the problem of bending of the sensing optical fiber caused by the impact of the concrete on the sensing optical fiber during the pouring of the concrete is reduced; meanwhile, during the use of the locking structure, the metal locking ring is elastically abutted against the sensing optical fiber for locking and fixation after being deformed by the annular inclined surface during the tightening of the locking threaded sleeve; and the arc-shaped gear rack portion on the upper surface of the arc-shaped slider can be engaged in the tooth groove for fixation, so as to improve the connection stability between the arc-shaped slider and the limiting sleeve.

[0011] The further arrangement of the present application is that the winding device comprises a square frame with a wire inlet hole at one end, a first winding shaft movably arranged at two side walls of the square frame, a first anti-off cover arranged at one end of the first winding shaft, a first compression spring arranged at one side of the first anti-off cover and the first winding shaft and driving the first winding shaft to move towards the side close to the first anti-off cover, a second anti-off cover with an internal hexagonal countersunk hole arranged at the other end of the first winding shaft, a plurality of semispherical limiting protrusions arranged in a circumferential array on the end face of the side plate of the square frame close to the second anti-off cover, a plurality of semispherical limiting grooves arranged in a circumferential array corresponding to the semispherical limiting protrusions, and the semispherical limiting protrusions are embedded in the semispherical limiting grooves under the action of the first compression spring, and the metal spring sheet buckle is arranged on the square frame.

[0012] By adopting the above technical scheme, when winding the steel wire rope through the winding device, the plurality of semispherical limiting protrusions of the second anti-off cover are separated from the plurality of semispherical limiting grooves by pressing the first anti-off cover to overcome the elastic force of the first compression spring, and then the second anti-off cover is rotated by a hexagonal bolt knife or other tools or by hand, so as to realize winding the steel wire rope, so as to adjust the position of the limiting sleeve, and after adjustment, the semispherical limiting protrusions are embedded in the semispherical limiting grooves for fixation under the resetting action of the first compression spring, so as to prevent the first winding shaft from rotating.

[0013] The further arrangement of the present application is that the winding device comprises a square frame with a wire inlet hole at one end, a first winding shaft movably arranged at two side walls of the square frame, a first winding shaft movably arranged at two side walls of the square frame, a first anti-off cover arranged at one end of the first winding shaft, a first compression spring arranged at one side of the first anti-off cover and the first winding shaft and driving the first winding shaft to move towards the side close to the first anti-off cover, a second anti-off cover with an internal hexagonal countersunk hole arranged at the other end of the first winding shaft, a plurality of semispherical limiting protrusions arranged in a circumferential array on the end face of the side plate of the square frame close to the second anti-off cover, a plurality of semispherical limiting grooves arranged in a circumferential array corresponding to the semispherical limiting protrusions, and the semispherical limiting protrusions are embedded in the semispherical limiting grooves under the action of the first compression spring, and the metal spring sheet buckle is arranged on the square frame.

[0014] By adopting the above technical scheme, when winding the steel wire rope through the winding device, the plurality of semispherical limiting protrusions of the second anti-off cover are separated from the plurality of semispherical limiting grooves by pressing the first anti-off cover to overcome the elastic force of the first compression spring, and then the second anti-off cover is rotated by a hexagonal bolt knife or other tools or by hand, so as to realize winding the steel wire rope, so as to adjust the position of the limiting sleeve, and after adjustment, the semispherical limiting protrusions are embedded in the semispherical limiting grooves for fixation under the resetting action of the first compression spring, so as to prevent the first winding shaft from rotating.

[0015] The further arrangement of the present application is that the metal elastic sheet buckling sleeve is in a "N" shape, and arc-shaped protruding parts matched with the hoop wire circumferential side are arranged on both sides of the metal elastic sheet buckling sleeve, and the arc-shaped protruding parts are used for elastically abutting against the hoop wire circumferential side.

[0016] By adopting the above technical scheme, the arc-shaped protruding parts on the metal elastic sheet buckling sleeve can improve the contact area with the hoop wire, thereby improving the buckling connection strength on the hoop wire.

[0017] The further arrangement of the present application is that the protective steel pipe is provided with a plurality of open grooves corresponding to the steel wire ropes of the auxiliary laying mechanism from bottom to top, and the protective steel pipe is used for covering the plurality of limiting sleeve pipes and the sensing optical fiber in the limiting sleeve pipes.

[0018] By adopting the above technical scheme, before pouring the concrete, the protective steel pipe is arranged to protect the plurality of limiting sleeve pipes and the sensing optical fiber in the limiting sleeve pipes, so that in the process of pouring the concrete from top to bottom, the sensing optical fiber is prevented from being collided by the falling concrete, and as the height of the poured concrete increases, the protective steel pipe is gradually lifted upwards to avoid the situation that the protective steel pipe cannot be taken out due to the excessive contact area with the concrete.

[0019] The object of the present application is to provide a structure detection method of a structure detection device based on optical fiber sensing technology, which can realize the function of laying the sensing optical fiber in the middle part of a column type reinforced concrete structure.

[0020] The technical purposes are achieved by the following technical solutions: a structural detection method of a structural detection device based on an optical fiber sensing technology, comprising the following steps: step S1: selecting a plurality of stirrup of a steel reinforcement framework of a column type reinforced concrete structure, and installing an auxiliary laying mechanism on the stirrup, so that a sensing optical fiber passes through a plurality of limiting sleeves of the auxiliary laying mechanism, and is fixed by a locking structure after the sensing optical fiber is tensioned; step S2: installing a protective steel pipe from top to bottom, so that an open groove of the protective steel pipe corresponds to a steel wire rope of the auxiliary laying mechanism, and then gradually lifting the protective steel pipe upwards in the process of pouring concrete, so as to weaken the impact force of the sensing optical fiber in the process of pouring concrete; step S3: when the concrete is solidified or subjected to external load, the sensing optical fiber will deform synchronously with the surrounding concrete, and the strain generated is the strain value of the concrete, an optical fiber sensing detection unit receives an optical signal sent by the sensing optical fiber, analyzes the optical signal, obtains temperature information data of each part of the optical fiber, sends the temperature information data to a real-time data analysis processing unit, and a data analysis unit analyzes index parameters of the column type reinforced concrete structure.

[0021] Further provided in the application is that in step S1, when the auxiliary laying mechanism is installed, the position of the two metal spring buckling sleeves on the stirrup is adjusted, the length of the steel wire rope wound by the two winding devices is adjusted, the position of the limiting sleeve is adjusted, and then the position of the sensing optical fiber after laying is adjusted.

[0022] Further provided in the application is that in step S1, when the auxiliary laying mechanism is installed, a plurality of auxiliary laying mechanisms with different limiting sleeve positions are additionally arranged, so that a plurality of sensing optical fibers can pass through, and a plurality of positions can be detected at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structural schematic diagram of example 1;

[0024] Figure 2 is a structural schematic diagram of a plurality of laying auxiliary mechanisms, a local sensing optical fiber, a protective steel pipe not installed and relatively Figure 1 rotated by 90 degrees in example 1;

[0025] Figure 3 is a structural schematic diagram of a laying auxiliary mechanism in example 1;

[0026] Figure 4 is a local structural explosion diagram of a laying auxiliary mechanism at a limiting sleeve and a locking structure in example 1 Figure 1 ;

[0027] Figure 5 is a local structural explosion diagram of a laying auxiliary mechanism at a limiting sleeve and a locking structure in example 1Figure 2 ;

[0028] Figure 6 is a structural schematic diagram of the laying auxiliary mechanism in Example 1 being located at the winding device;

[0029] Figure 7 is a partial structural sectional view of the laying auxiliary mechanism in Example 1 being located at the winding device;

[0030] Figure 8 is a structural sectional view of the laying auxiliary structure in Example 2 being located at the winding device.

[0031] Fig. 1 is a sensing optical fiber; Fig. 2 is an optical fiber sensing detection unit; Fig. 3 is a real-time data analysis processing unit; Fig. 4 is an auxiliary laying mechanism; Fig. 41 is a limiting sleeve; Fig. 411 is an outer threaded tube; Fig. 412 is a first annular groove; Fig. 413 is a tooth groove; Fig. 42 is an arc-shaped sliding block; Fig. 421 is an arc-shaped rack part; Fig. 422 is an arc-shaped embedding part; Fig. 43 is a steel wire rope; Fig. 44 is a winding device; Fig. 441 is a square frame; Fig. 4411 is a hemispherical limiting recess; Fig. 442 is a first winding shaft; Fig. 443 is a first anti-falling cover; Fig. 444 is a first compression spring; Fig. 445 is a second anti-falling cover; Fig. 4451 is a hemispherical limiting protrusion; Fig. 446 is a base; Fig. 4461 is a regular polygon hole; Fig. 4462 is a movable hole; Fig. 4463 is a support; Fig. 447 is a second winding shaft; Fig. 4471 is an anti-falling end; Fig. 4472 is a telescopic shaft; Fig. 4473 is a regular polygon end; Fig. 448 is a second compression spring; Fig. 45 is a metal spring sheet buckling sleeve; Fig. 451 is an arc-shaped protruding part; Fig. 46 is a locking structure; Fig. 461 is a locking threaded sleeve; Fig. 4611 is an annular inclined surface; Fig. 4612 is a second annular groove; Fig. 462 is a metal locking ring; Fig. 5 is a protective steel tube; Fig. 51 is an open slot. DETAILED DESCRIPTION

[0032] The application will be further described in detail below with reference to the accompanying drawings.

[0033] Example 1: A structural detection device based on optical fiber sensing technology, as shown in Figure 1 and Figure 2 , comprises a sensing optical fiber 1, an optical fiber sensing detection unit 2, a real-time data analysis processing unit 3, and a plurality of auxiliary laying mechanisms 4 for laying the sensing optical fiber 1, the sensing optical fiber 1 being used for laying in a column type reinforced concrete structure, the optical fiber sensing detection unit 2 being used for receiving optical signals sent by the sensing optical fiber 1, analyzing the optical signals and obtaining temperature information data of each part of the optical fiber, and sending the temperature information data to the real-time data analysis processing unit 3.

[0034] As shown in Figure 2 and Figure 3As shown, the auxiliary laying mechanism 4 includes a limiting sleeve 41 through which the sensing optical fiber 1 passes, at least two arc-shaped sliders 42 arranged on the limiting sleeve 41 along the center line circumference of the limiting sleeve 41, a steel wire rope 43 arranged on one end of the arc-shaped slider 42, a winding device 44 arranged at the other end of the steel wire rope 43 and realizing winding and unwinding of the steel wire rope 43, a metal spring piece clamping sleeve 45 arranged on the winding device 44 and realizing clamping on the stirrup of the steel reinforcement cage, a locking structure 46 arranged at the lower end of the limiting sleeve 41, the locking structure 46 simultaneously fixing or unlocking the arc-shaped slider 42 and the sensing optical fiber 1; along the length direction of the steel reinforcement cage of the column type reinforced concrete structure, a plurality of auxiliary laying mechanisms 4 are arranged to enable the sensing optical fiber 1 to pass through a plurality of limiting sleeves 41 along the vertical direction.

[0035] As shown in Figures 3 to 5 , the lower surface of the limiting sleeve 41 is provided with an external threaded pipe 411, the locking structure 46 includes a locking threaded sleeve 461 threadedly connected to the external threaded pipe 411, a metal locking ring 462 sleeved around the sensing optical fiber 1 and abutting against the end of the external threaded pipe 411, the outer diameter of the metal locking ring 462 gradually decreases along the vertical downward direction, the inside of the locking threaded sleeve 461 is provided with an annular inclined surface 4611 abutting against the sensing optical fiber 1 after the metal locking ring 462 is deformed during the tightening of the locking threaded sleeve 461, and the outer side of the annular inclined surface 4611 is matched with the metal locking ring 462. The lower surface of the limiting sleeve 41 is provided with a first annular groove 412, the first annular groove 412 is provided with a circular tooth groove 413, the upper surface of the locking threaded sleeve 461 is provided with a second annular groove 4612 corresponding to the first annular groove 412, the upper surface of the arc-shaped slider 42 is provided with an arc-shaped rack portion 421 embedded in the first annular groove 412, and the lower surface of the arc-shaped slider 42 is provided with an arc-shaped embedding portion 422 embedded in the second annular groove 4612. During the complete tightening of the external threaded pipe 411, the arc-shaped rack portion 421 is gradually embedded in the tooth groove 413 for meshing and fixing.

[0036] As shown in Figure 3 , Figure 6 , and Figure 7As shown, the winding device 44 comprises a square frame 441 with a wire inlet hole at one end, a first winding shaft 442 movably arranged at two sides of the square frame 441, a first anti-off cover 443 arranged at one end of the first winding shaft 442, a first compression spring 444 arranged at one side of the first anti-off cover 443 and the first winding shaft 442 and driving the first winding shaft 442 to move towards the side close to the first anti-off cover 443, a second anti-off cover 445 arranged at the other end of the first winding shaft 442 and having an inner hexagonal countersunk hole, the second anti-off cover 445 is arranged with a plurality of circumferentially arrayed semispherical limiting protrusions 4451 close to the end face of the side plate of the square frame 441, the square frame 441 is correspondingly arranged with a plurality of circumferentially arrayed semispherical limiting grooves 4411, the semispherical limiting protrusions 4451 are embedded in the plurality of semispherical limiting grooves 4411 under the action of the first compression spring 444, and a metal spring buckle sleeve 45 is arranged on the square frame 441.

[0037] As shown in Figure 3 and Figure 6 The metal spring buckle sleeve 45 is in the shape of a "N" character, and the metal spring buckle sleeve 45 is arranged with arc-shaped protrusions 451 on both sides which are matched with the circumferential side of the stirrup, and the arc-shaped protrusions 451 are used for elastically abutting against the circumferential side of the stirrup.

[0038] As shown in Figures 1 to 3 It also comprises a protective steel pipe 5, the protective steel pipe 5 is arranged with a plurality of opening grooves 51 corresponding to the steel wire ropes 43 of the auxiliary laying mechanism 4 from top to bottom, and the protective steel pipe 5 is used for covering the plurality of limiting sleeves 41 and the sensing optical fiber 1 located in the limiting sleeves 41, and the protective steel pipe 5 is gradually lifted upwards to take out the protective steel pipe 5 during the pouring process of the concrete from top to bottom.

[0039] Implementation effect: first select a number of column reinforced concrete structure of reinforcement skeleton of stirrup installation auxiliary laying mechanism 4, so that the sensing optical fiber 1 through the multiple auxiliary laying mechanism 4 limiting sleeve 41, and after the tension sensing optical fiber 1 by locking structure 46 fixed; When the concrete solidification or by external load, sensing optical fiber 1 will and its surrounding concrete synchronous deformation, its strain size is the strain value of concrete, fiber sensing detection unit 2 receives the light signal sent by sensing optical fiber 1, analyzes the light signal and obtains the temperature information data of each part of the optical fiber, sends the temperature information data to the real-time data analysis processing unit 3, the data analysis unit analyzes the index parameters of column reinforced concrete structure; At the same time in the use of auxiliary laying mechanism 4, the position of two metal spring buckle sleeve 45 on the stirrup can be adjusted, the length of two steel wire rope 43 between the winder 44 and the arc slider 42 can be adjusted, so that the position of the limiting sleeve 41 can be adjusted according to the actual detection needs, so as to adjust the position of the sensing optical fiber 1; In addition, the arc slider 42 is circumferentially connected with the limiting sleeve 41, and the metal spring buckle sleeve 45 can be installed on the required reinforcement skeleton of the upright bar according to the requirement, so as to improve the installation range.

[0040] After the sensing optical fiber 1 passes through the multiple limiting sleeves 41, the locking structure 46 is arranged, so that the sensing optical fiber 1 between the two limiting sleeves 41 is in a straightened state, and the problem of bending of the sensing optical fiber 1 caused by the impact of the concrete on the sensing optical fiber 1 during the pouring of the concrete is reduced; At the same time in the use of locking structure 46, in the process of tightening the locking threaded sleeve 461, the annular inclined surface 4611 gradually drives the metal locking ring 462 to deform and elastically abuts against the side of the sensing optical fiber 1 to lock and fix; And the arc gear part 421 on the upper surface of the arc slider 42 is engaged in the tooth groove 413 to fix, so as to improve the connection stability between the arc slider 42 and the limiting sleeve 41. When the steel wire rope 43 is wound by the winder 44, the first anti-loose cover 443 is pressed first to overcome the elastic force of the first compression spring 444, so that the multiple hemispherical limiting protrusions 4451 of the second anti-loose cover 445 are separated from the multiple hemispherical limiting grooves 4411, and then the second anti-loose cover 445 is rotated by means of a hexagonal bolt knife or hand screwing, so as to realize the winding of the steel wire rope 43, so as to adjust the position of the limiting sleeve 41, and after adjustment, the hemispherical limiting protrusions 4451 are embedded in the hemispherical limiting grooves 4411 to fix, preventing the first winding shaft 442 from rotating.

[0041] Before pouring concrete, the protective steel pipe 5 is arranged to limit the position of the plurality of sleeve pipes 41 and the sensing optical fiber 1 located in the sleeve pipe 41, so that during the pouring of concrete from top to bottom, the sensing optical fiber 1 is avoided from being collided by the falling concrete, and as the height of the poured concrete increases, the protective steel pipe 5 is gradually lifted upwards to avoid the situation that the protective steel pipe 5 cannot be taken out due to excessive contact area with the concrete; at the same time, when the protective steel pipe 5 is arranged, the opening slot 51 of the protective steel pipe 5 corresponds to the position of the steel wire rope 43, and at this time, the steel wire rope 43 of the plurality of laying auxiliary mechanisms can support the protective steel pipe 5 to avoid the situation that the protective steel pipe 5 is tilted.

[0042] Embodiment 2: A structure detection device based on optical fiber sensing technology, as shown in Figure 8 The difference between the embodiment 1 and the embodiment 2 is that the structure of the winding device 44 is different, the winding device 44 comprises a base 446, a second winding shaft 447, and a second compression spring 448, the upper surface of the base 446 is provided with a regular polygon hole 4461, the base 446 is provided with a movable hole 4462 communicating with the regular polygon hole 4461, the base 446 is provided with a support 4463, the upper end of the second winding shaft 447 is provided with a non-slip end 4471 with an internal hexagonal countersunk hole, the lower end of the second winding shaft 447 is provided with a telescopic shaft 4472 telescopically arranged on the support 4463, the lower end of the telescopic shaft 4472 is provided with a regular polygon end 4473 telescopically arranged in the regular polygon hole 4461, the second compression spring 448 is sleeved on the telescopic shaft 4472 and located between the support 4463 and the second winding shaft 447, the second compression spring 448 drives the regular polygon end 4473 to be embedded in the regular polygon hole 4461, when the second compression spring 448 is pressed downward, the regular polygon end 4473 is embedded in the movable hole 4462 so that the second winding shaft 447 can rotate, and the metal sheet buckle sleeve 45 is arranged on the lower surface of the base 446. At the same time, the top of the second winding shaft 447.

[0043] The effect of the embodiment is that when the steel wire rope 43 is wound by the winding device 44, the second winding shaft is first pressed to overcome the elastic force of the second compression spring 448, so that the regular polygon end 4473 is embedded in the movable hole 4462, at this time, the second winding shaft can be rotated to realize the winding of the steel wire rope 43 by the internal hexagonal countersunk hole, so as to adjust the position of the limiting sleeve pipe 41, and after adjustment, the regular polygon end 4473 is embedded in the regular polygon hole 4461 under the restoring action of the second compression spring 448, so as to prevent the second winding shaft 447 from rotating.

[0044] The embodiment 3 is a structure detection method of a structure detection device based on an optical fiber sensing technology, comprising the following steps: step S1: selecting a plurality of stirrups of a steel reinforcement framework of a column reinforced concrete structure, installing an auxiliary laying mechanism 4 on the stirrup, so that a sensing optical fiber 1 passes through a plurality of limiting sleeves 41 of the auxiliary laying mechanism 4, and is fixed by a locking structure 46 after the sensing optical fiber 1 is tensioned; step S2: installing a protective steel pipe 5 from top to bottom, so that an open groove 51 of the protective steel pipe 5 corresponds to a steel wire rope 43 of the auxiliary laying mechanism 4, and then gradually lifting the protective steel pipe 5 upwards in the process of pouring concrete, so as to weaken the impact force of the sensing optical fiber 1 in the process of pouring concrete; step S3: when the concrete is solidified or subjected to external load, the sensing optical fiber 1 will be deformed synchronously with the surrounding concrete, and the strain generated is the strain value of the concrete, an optical fiber sensing detection unit 2 receives an optical signal sent by the sensing optical fiber 1, analyzes the optical signal, obtains temperature information data of each part of the optical fiber, sends the temperature information data to a real-time data analysis processing unit 3, and a data analysis unit analyzes index parameters of the column reinforced concrete structure.

[0045] In step S1, when the auxiliary laying mechanism 4 is installed, the positions of the two metal spring buckling sleeves 45 of the auxiliary laying mechanism 4 on the stirrup are adjusted, the lengths of the two winding devices 44 for winding and unwinding the steel wire rope 43 are adjusted, the positions of the limiting sleeves 41 are adjusted, and the positions of the sensing optical fibers 1 after laying are adjusted. The positions of the limiting sleeves 41 of the auxiliary laying mechanism 4 are adjusted. In step S1, when the auxiliary laying mechanism 4 is installed, a plurality of auxiliary laying mechanisms 4 with different positions of the limiting sleeves 41 are additionally arranged, so that a plurality of sensing optical fibers 1 can pass through, and a plurality of positions can be detected at the same time.

[0046] The embodiment is only an explanation of the application, and is not a limitation of the application. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the application.

Claims

1. A structural detection device based on fiber optic sensing technology, comprising a sensing fiber (1), a fiber optic sensing and detection unit (2), a real-time data analysis and processing unit (3), and multiple auxiliary laying mechanisms (4) for laying the sensing fiber (1), wherein the sensing fiber (1) is used to lay in a column-type reinforced concrete structure, and the fiber optic sensing and detection unit (2) is used to receive the optical signal sent by the sensing fiber (1), analyze the optical signal and obtain temperature information data of various parts of the fiber, and send the temperature information data to the real-time data analysis and processing unit (3), characterized in that: The auxiliary laying mechanism (4) includes a limiting sleeve (41) through which the sensing optical fiber (1) passes, at least two arc-shaped sliders (42) that slide circumferentially along the center line of the limiting sleeve (41) on the limiting sleeve (41), a steel wire rope (43) with one end on the arc-shaped slider (42), a winder (44) at the other end of the steel wire rope (43) for winding and unwinding the steel wire rope (43), a metal spring clip fastening sleeve (45) on the winder (44) for fastening to the stirrups of the steel reinforcement skeleton, and a locking structure (46) at the lower end of the limiting sleeve (41). The locking structure (46) simultaneously fixes or unlocks the arc-shaped slider (42) and the sensing optical fiber (1). Along the length direction of the steel reinforcement skeleton of the column-type reinforced concrete structure, several auxiliary laying mechanisms (4) are set so that the sensing optical fiber (1) passes through several limiting sleeves (41) in the vertical direction.

2. The structural detection device based on fiber optic sensing technology according to claim 1, characterized in that: The lower surface of the limiting sleeve (41) is provided with an external threaded tube (411). The locking structure (46) includes a locking threaded sleeve (461) threaded to the external threaded tube (411) and a metal locking ring (462) sleeved on the periphery of the sensing optical fiber (1) and abutting the end of the external threaded tube (411). The outer diameter of the metal locking ring (462) gradually decreases in the vertical downward direction. The locking threaded sleeve (461) is provided with an annular inclined surface (4611) inside, which drives the metal locking ring (462) to deform and abut against the periphery of the sensing optical fiber (1) during the tightening process of the locking threaded sleeve (461). The annular inclined surface (4611) and the outer side of the metal locking ring (462) are matched. The lower surface of the limiting sleeve (41) is provided with a first annular groove (412), and a circular toothed groove (413) is provided in the first annular groove (412). The upper surface of the locking threaded sleeve (461) is provided with a second annular groove (4612) corresponding to the first annular groove (412). The upper surface of the arc-shaped slider (42) is provided with an arc-shaped rack portion (421) embedded in the first annular groove (412), and the lower surface of the arc-shaped slider (42) is provided with an arc-shaped embedding portion (422) embedded in the second annular groove (4612). When the external threaded tube (411) is fully tightened, the arc-shaped rack portion (421) gradually embeds into the toothed groove (413) for engagement and fixation.

3. The structural detection device based on fiber optic sensing technology according to claim 1, characterized in that: The coiler (44) includes a square frame (441) with a wire inlet hole at one end, a first winding shaft (442) whose two ends are movably arranged on the two side walls of the square frame (441), a first anti - detachment cover (443) arranged at one end of the first winding shaft (442), a first compression spring (444) arranged on one side of the first anti - detachment cover (443) and the first winding shaft (442) and driving the first winding shaft (442) to move towards the side close to the first anti - detachment cover (443), and a second anti - detachment cover (445) with a countersunk hexagon socket head hole arranged at the other end of the first winding shaft (442). A plurality of hemispherical limiting protrusions (4451) distributed in a circumferential array are arranged on the end face of the second anti - detachment cover (445) close to the side plate of the square frame (441). A plurality of hemispherical limiting grooves (4411) distributed in a circumferential array are arranged at the corresponding position of the square frame (441). The hemispherical limiting protrusions (4451) are embedded in the plurality of hemispherical limiting grooves (4411) under the action of the first compression spring (444). The metal elastic sheet buckling sleeve (45) is arranged on the square frame (441).

4. The structural detection device based on fiber optic sensing technology according to claim 1, characterized in that: The coiler (44) includes a base (446), a second winding shaft (447), and a second compression spring (448). A regular polygon hole (4461) is arranged on the upper surface of the base (446). An activity hole (4462) communicated with the regular polygon hole (4461) is arranged inside the base (446). A bracket (4463) is arranged on the base (446). An anti - detachment end (4471) with a countersunk hexagon socket head hole is arranged at the upper end of the second winding shaft (447). A telescopic shaft (4472) telescopically arranged on the bracket (4463) is arranged at the lower end of the second winding shaft (447). A regular polygon end (4473) telescopically arranged in the regular polygon hole (4461) is arranged at the lower end of the telescopic shaft (4472). The second compression spring (448) is sleeved on the telescopic shaft (4472) and is located between the bracket (4463) and the second winding shaft (447). The second compression spring (448) drives the regular polygon end (4473) to be in a state of being embedded in the regular polygon hole (4461). When the second compression spring (448) is pressed downwards, the regular polygon end (4473) is embedded in the activity hole (4462) so that the second winding shaft (447) can rotate. The metal elastic sheet buckling sleeve (45) is arranged on the lower surface of the base (446).

5. A structure detection device based on fiber optic sensing technology according to claim 3 or 4, characterized in that: The metal elastic sheet buckling sleeve (45) is in a "U" shape. Arc - shaped protrusions (451) matched with the periphery of the stirrup are arranged on both sides of the metal elastic sheet buckling sleeve (45). The arc - shaped protrusions (451) are used for elastically pressing against the periphery of the stirrup.

6. The structural detection device based on fiber optic sensing technology according to claim 1, characterized in that: It also includes a protective steel pipe (5), which has multiple opening slots (51) for the wire ropes (43) of the auxiliary laying mechanism (4) from bottom to top. The protective steel pipe (5) is used to cover multiple limiting sleeves (41) and the sensing optical fiber (1) located in the limiting sleeves (41). During the concrete pouring process from top to bottom, the protective steel pipe (5) is gradually lifted upward to remove the protective steel pipe (5).

7. A structural detection method for a structural detection device based on fiber optic sensing technology according to claim 6, characterized in that: Includes the following steps: Step S1: Select several column-type reinforced concrete structures and install auxiliary laying mechanisms (4) on the stirrups of the steel reinforcement skeleton so that the sensing fiber (1) passes through the limiting sleeves (41) of multiple auxiliary laying mechanisms (4) and is fixed by locking structure (46) after the sensing fiber (1) is tightened. Step S2: Install the protective steel pipe (5) from top to bottom, so that the opening groove (51) of the protective steel pipe (5) corresponds to the wire rope (43) of the auxiliary laying mechanism (4). Then, during the concrete pouring process, gradually lift the protective steel pipe (5) upward to reduce the impact force on the sensing fiber (1) during the concrete pouring process. Step S3: When the concrete solidifies or is subjected to external load, the sensing fiber (1) will deform synchronously with the surrounding concrete. The strain magnitude is the strain value of the concrete. The fiber sensing detection unit (2) receives the light signal sent by the sensing fiber (1), analyzes the light signal and obtains the temperature information data of each part of the fiber, and sends the temperature information data to the real-time data analysis and processing unit (3). The data analysis unit analyzes the index parameters of the column-type reinforced concrete structure.

8. The detection method of the structure detection device based on fiber optic sensing technology according to claim 7, characterized in that: In step S1, when the auxiliary laying mechanism (4) is installed, the position of the two metal spring clips (45) of the auxiliary laying mechanism (4) on the stirrup is adjusted, and the length of the two winders (44) winding and unwinding the steel wire rope (43) is adjusted to realize the position of the limiting sleeve (41), thereby adjusting the position of the sensing fiber (1) after laying. The adjustment is made by adjusting the position of the limiting sleeve (41) of the auxiliary laying mechanism (4).

9. The detection method of the structure detection device based on fiber optic sensing technology according to claim 8, characterized in that: When the auxiliary laying mechanism (4) is installed in step S1, multiple sets of auxiliary laying mechanisms (4) with different positions of limiting sleeves (41) can be added to allow multiple sensing optical fibers (1) to pass through, so as to realize simultaneous detection of multiple positions.

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