Cooperative deformation structure for embedding fiber bragg grating into anchor rod frame lattice beam

Abstract

The invention relates to a cooperative deformation structure of a fiber bragg grating embedded anchor rod frame lattice beam. The cooperative deformation structure comprises a protection slope, an optical fiber sensing device, a frame lattice beam, an anchor rod supporting module and a lattice beam groove. The lattice beam groove is formed in the protection slope; the anchor rod supporting module comprises anchor rod holes and anchor rods, the anchor rod holes are formed in the lattice beam grooves, and the anchor rods are fixed in the anchor rod holes; the frame lattice beam is arranged in the lattice beam groove and comprises a steel reinforcement framework and a lattice beam concrete layer; a lattice beam concrete layer is poured in the steel reinforcement framework, and the lattice beam concrete layer and the anchor rod are fixed; the optical fiber sensing device comprises an optical fiber cable and a plastic coil, the optical fiber cable is fixed on the steel reinforcement framework, and the plastic coil sleeves the corner of the optical fiber cable. The system has the beneficial effects that the optical fiber cables are folded back and forth and arranged on the transverse steel reinforcement frameworks and the vertical steel reinforcement frameworks, so that the optical fiber cables can cover a key stress area, the monitoring effect is more accurate, and the optical fiber cables can cooperatively and synchronously deform along with the lattice beams when the lattice beams are stressed and deform.

Description

Technical Field

[0001] This invention belongs to the field of intelligent geotechnical detection technology, and particularly relates to a cooperative deformation structure of fiber optic grating embedded in anchor frame grid beam. Background Technology

[0002] Slope stability monitoring plays a crucial role in modern infrastructure construction and disaster management. Slope instability can lead to severe consequences, including casualties, property damage, and environmental degradation. Traditional monitoring methods, such as manual measurement and GPS, are limited by accuracy and monitoring frequency, making them insufficient to meet the real-time, high-precision monitoring needs of modern engineering projects. Fiber Bragg grating (FBG) sensing technology, as an advanced monitoring method, has been widely used in the civil engineering industry in recent years. Its basic principle is to utilize the photosensitivity of optical fiber materials to form a spatial phase grating within the fiber core. When external physical parameters change, the reflected wavelength of the fiber grating changes accordingly, and these changes can be accurately measured using a demodulator.

[0003] In existing applications of fiber Bragg gratings and anchor frame grid beams, several problems exist that prevent them from coordinating deformation effectively, thus affecting the monitoring performance of the optical fiber. The significant difference in elastic modulus between the fiber Bragg grating and anchor frame grid beam materials leads to uneven strain force transmitted through the concrete under stress, easily causing stress concentration in the cross-section and affecting the coordinating deformation effect. Furthermore, while existing encapsulation methods, such as heat-shrink tubing, provide some protection, the fiber Bragg grating may still be damaged in complex engineering environments, affecting its coordinating deformation with the anchor frame grid beam. Therefore, a coordinating deformation structure embedding a fiber Bragg grating into an anchor frame grid beam is proposed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cooperative deformation structure for fiber optic grating embedded in anchor frame grid beams.

[0005] This cooperative deformation structure of fiber optic grating embedded in anchor frame grid beams includes: a slope protection, a fiber optic sensing device, a frame grid beam, an anchor support module, and a grid beam trench; the grid beam trench is opened within the slope protection; the anchor support module includes anchor holes and anchors, with the anchor holes opened within the grid beam trench and the anchors fixed within the anchor holes; the frame grid beam is located within the grid beam trench and includes a steel reinforcement skeleton and a grid beam concrete layer; the grid beam concrete layer is poured within the steel reinforcement skeleton, and the grid beam concrete layer and anchors are fixed; the fiber optic sensing device includes fiber optic cables and plastic coils, with the fiber optic cables fixed to the steel reinforcement skeleton and the plastic coils sleeved at the corners of the fiber optic cables.

[0006] Preferably, the grid beam trench includes transverse trenches, vertical trenches, and intersecting trenches; the transverse trenches are opened horizontally on the slope, the vertical trenches are opened vertically on the slope, and the intersection of the transverse trenches and the vertical trenches is the intersecting trench.

[0007] Preferably, the reinforcing steel cage includes a horizontal reinforcing steel cage and a vertical reinforcing steel cage; the horizontal reinforcing steel cage is fixedly installed in a horizontal trench, the vertical reinforcing steel cage is fixedly installed in a vertical trench, and the intersection of the horizontal and vertical reinforcing steel cages is located in a cross trench.

[0008] Preferably, the anchor bolt hole is opened in the cross groove; one end of the anchor bolt is fixed in the anchor bolt hole by the anchor bolt concrete poured in the anchor bolt hole, and the other end of the anchor bolt penetrates the concrete layer of the fixed grid beam.

[0009] Preferably, the optical fiber cable includes a silicone buffer sleeve, a polyimide coating, a capillary pressure-resistant sleeve, and an optical fiber core; a capillary pressure-resistant sleeve is fixedly fitted on the outside of the optical fiber core, and a silicone buffer sleeve is fixedly fitted on the outside of the capillary pressure-resistant sleeve, with a polyimide coating sprayed on the outer wall of the silicone buffer sleeve; the optical fiber cable is tied to the horizontal reinforcing steel skeleton, and the optical fiber cable is folded back and forth along the horizontal and vertical reinforcing steel skeletons, forming multiple interconnected "V" shapes; one end of the optical fiber cable extends out of the grid beam concrete layer, and the remaining part of the optical fiber cable is embedded in the grid beam concrete layer.

[0010] The construction method for this cooperative deformation structure of fiber optic grating embedded in anchor frame grid beams includes the following steps:

[0011] Step 1: After measuring and cleaning the slope, excavate the grid beam trench on the slope.

[0012] Step 2: Drill anchor holes in the grid beam trench and fix the anchors in the anchor holes;

[0013] Step 3: Install the steel reinforcement cage in the grid beam trench, tie the fiber optic cable to the steel reinforcement cage, and extend one end of the fiber optic cable out of the steel reinforcement cage.

[0014] Step 4: Set up a formwork around the outermost edge of the grid beam trench, and pour concrete into the grid beam trench to solidify and form the grid beam concrete layer.

[0015] Step 5: Use a hydraulic jack to tension the anchor rod, cut out the part of the anchor rod that extends out of the concrete layer of the grid beam, and connect one end of the fiber optic cable to an external spectrometer.

[0016] As a preferred option, in step two, the grid beam trenches are arranged in a crisscross pattern, with the horizontal ones being horizontal trenches and the vertical ones being vertical trenches, and the intersections being cross trenches. After drilling anchor bolt holes at the cross trenches, the inside of the anchor bolt holes is cleaned using high-pressure air, the anchor bolts are inserted into the anchor bolt holes, and the anchor bolt holes are grouted. After the grout solidifies, it forms anchor bolt concrete.

[0017] Preferably, in step three, the reinforcing steel cage consists of a horizontal reinforcing steel cage and a vertical reinforcing steel cage. After the anchor bolt concrete is cured, the vertical reinforcing steel cage is first laid in the vertical trench, and then the horizontal reinforcing steel cage is laid in the horizontal trench. The horizontal and vertical reinforcing steel cages are installed crosswise, and the positions of the horizontal and vertical reinforcing steel cages are adjusted so that the anchor bolt passes through the horizontal and vertical reinforcing steel cages.

[0018] Preferably, in step three, when binding the optical fiber cables to the steel reinforcement frame, the distance between the optical fiber cables is controlled between 0.5 and 1.0 m, and a pre-tension strain of 0.1% to 0.3% is applied to the optical fiber cables.

[0019] As a preferred option, in step four, after the fiber optic cable is installed, the template is supported on the sides and top of the horizontal and vertical steel reinforcement cages, and concrete is poured into the horizontal and vertical steel reinforcement cages enclosed by the template. During pouring, the pouring cavity is vibrated.

[0020] The beneficial effects of this invention are:

[0021] 1) This invention utilizes a capillary pressure-resistant sleeve to encase the optical fiber core and a silicone buffer sleeve to encase the polyimide coating. The capillary pressure-resistant sleeve provides impact resistance during construction and reduces the occurrence of brittle fracture under stress. This prevents the optical fiber cable from being sheared at the nodes of the frame beam when it is encapsulated in concrete. Furthermore, the outer silicone buffer sleeve is made of a high-strength and highly elastic material, which can provide a certain degree of impact resistance for the optical fiber core, making it less prone to damage and breakage when subjected to pressure and external impact.

[0022] 2) The outer layer of the optical fiber of the present invention is coated with polyimide. The polyimide coating can enhance the elastic modulus of the silicone buffer sleeve. After the concrete layer of the grid beam is poured, a certain gradient difference is formed between the elastic modulus of the grid beam concrete layer, the anchor rod and the polyimide coating, which can reduce the difference in cross-sectional shear stress, thereby ensuring synchronous strain transmission and thus ensuring a high strain transmission coefficient. In addition, the fiber grating is multi-layered and protected by plastic coils, making it resistant to pressure and impact, and also preventing shear damage.

[0023] 3) Before the concrete grid beam is poured, the fiber optic cable is folded back along the axis of the transverse steel reinforcement skeleton. By binding or welding the fixing bracket, the fiber optic cable is folded back and forth on the transverse and vertical steel reinforcement skeletons. This allows the fiber optic cable to cover the key stress area, thereby making the monitoring effect more accurate. Furthermore, by binding or welding the metal fixing bracket to fix the fiber optic cable and the transverse steel reinforcement skeleton, it can be made to fit better, so that when the grid beam is deformed by stress, the fiber optic cable can deform synchronously with it. Attached Figure Description

[0024] Figure 1 It is a schematic diagram of a three-dimensional structure;

[0025] Figure 2 It is a structural diagram of structures such as horizontal and vertical grooves;

[0026] Figure 3 It is a structural diagram of structures such as cross grooves and anchor bolts;

[0027] Figure 4 yes Figure 3 A magnified structural diagram of part A in the middle;

[0028] Figure 5 It is a structural diagram of fiber optic cables and templates, etc.

[0029] Figure 6 It is a structural diagram of structures such as horizontal and vertical steel reinforcement cages;

[0030] Figure 7 It is a structural diagram of fiber optic cables and slope protection structures;

[0031] Figure 8 yes Figure 7 A magnified structural diagram of part B in the middle section;

[0032] Figure 9 It is a structural diagram of capillary pressure-resistant tubing and optical fiber cores.

[0033] Explanation of reference numerals in the attached drawings: 1. Slope protection; 2. Fiber optic sensing device; 4. Anchor bolt support module; 5. Grid beam trench; 6. Template; 20. Fiber optic cable; 201. Silicone buffer sleeve; 202. Polyimide coating; 203. Capillary compression sleeve; 204. Fiber optic core; 21. Plastic coil; 30. Frame grid beam; 30. Horizontal steel reinforcement skeleton; 302. Vertical steel reinforcement skeleton; 303. Grid beam concrete layer; 40. Anchor bolt hole; 41. Anchor bolt concrete; 42. Horizontal trench; 50. Vertical trench; 51. Cross trench; 52. Detailed Implementation

[0034] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0035] Example 1

[0036] As one embodiment, a cooperative deformation structure for embedding fiber optic gratings into anchor frame grid beams is proposed, such as... Figure 1-9As shown, it includes: a slope protection 1, a fiber optic sensing device 2, a frame grid beam 30, an anchor support module 4, and a grid beam trench 5; the grid beam trench 5 is located within the slope protection 1; the anchor support module 4 includes anchor holes 40 and anchors 41, the anchor holes 40 are located within the grid beam trench 5, and the anchors 41 are fixed within the anchor holes 40; the frame grid beam 30 is located within the grid beam trench 5 and includes a steel reinforcement cage and a grid beam concrete layer 303; the grid beam concrete layer 303 is poured within the steel reinforcement cage, and the grid beam concrete layer 303 is fixed to the anchors 41; in order to achieve utilization The fiber optic sensing device 2, which monitors stress changes in the slope grid beam, includes a fiber optic cable 20 and a plastic coil 21. The fiber optic cable 20 is fixed to the steel reinforcement frame, and the plastic coil 21 is fitted at the corner of the fiber optic cable 20, including the connection between the fiber optic cable 20 and the anchor rod 41. The grid beam trench 5 includes a transverse trench 50, a vertical trench 51, and a cross trench 52. The transverse trench 50 is opened laterally on the slope 1, and the vertical trench 51 is opened longitudinally on the slope 1. The intersection of the transverse trench 50 and the vertical trench 51 is the cross trench 52.

[0037] like Figure 5 and Figure 6 As shown, the reinforcing steel cage includes a horizontal reinforcing steel cage 301 and a vertical reinforcing steel cage 302; the horizontal reinforcing steel cage 301 is fixedly installed in a horizontal trench 50, and the vertical reinforcing steel cage 302 is fixedly installed in a vertical trench 51. The intersection of the horizontal reinforcing steel cage 301 and the vertical reinforcing steel cage 302 is located in a cross groove 52; Figure 1-4 As shown, the anchor bolt hole 40 is opened in the cross groove 52; one end of the anchor bolt 41 is fixed in the anchor bolt hole 40 by the anchor bolt concrete 42 poured in the anchor bolt hole 40, and the other end of the anchor bolt 41 penetrates the fixed grid beam concrete layer 303, thereby fixing the frame grid beam 30 with the anchor bolt 41.

[0038] like Figure 7-9 As shown, the optical fiber cable 20 includes a silicone buffer sleeve 201, a polyimide coating 202, a capillary compression-resistant sleeve 203, and an optical fiber core 204. A capillary compression-resistant sleeve 203 is fixedly fitted around the outer side of the optical fiber core 204, and a silicone buffer sleeve 201 is fixedly fitted around the outer side of the capillary compression-resistant sleeve 203. The outer wall of the silicone buffer sleeve 201 is coated with a polyimide coating 202. The capillary compression-resistant sleeve 203 is made of at least one of stainless steel and titanium alloy. The optical fiber cable 20 is tied to a horizontal reinforcing steel frame 301, and the optical fiber cable 20 is folded back and forth along the horizontal reinforcing steel frame 301 and the vertical reinforcing steel frame 302. The optical fiber cable 20 is arranged in multiple interconnected "V" shapes. The optical fiber cable 20 is fixed to the reinforcing steel frame. One end of the optical fiber cable 20 extends out of the grid beam concrete layer 303, and the remaining part of the optical fiber cable 20 is embedded in the grid beam concrete layer 303.

[0039] Example 2

[0040] As another embodiment, this second embodiment, based on the first embodiment, proposes a more specific cooperative deformation structure for fiber optic grating embedded in the anchor frame grid beam, such as... Figure 1-9 As shown, the structure includes a slope protection 1 and a template 6. In order to design an embedded structure that allows the fiber optic cable 20 and the frame grid beam 30 to deform in tandem, a grid beam groove 5 is opened in the slope protection 1. The grid beam groove 5 is equipped with a frame grid beam 30 and an anchor bolt support module 4. The frame grid beam 30 is equipped with a fiber optic sensing device 2. The frame grid beam 30 is supported by the anchor bolt support module 4, and the fiber optic sensing device 2 is embedded and fixed by the frame grid beam 30.

[0041] like Figure 7 As shown, in order to improve the monitoring effect of the fiber optic grating, the fiber optic cable 20 is arranged by folding back and forth along the axis of the transverse steel reinforcement skeleton 301 and is tied to the transverse steel reinforcement skeleton 301. Before the concrete grid beam is poured, the fiber optic cable 20 is folded back and forth along the axis of the transverse steel reinforcement skeleton 301 and fixed by binding or welding brackets. The fiber optic cable 20 is folded back and forth on the transverse steel reinforcement skeleton 301 and the vertical steel reinforcement skeleton 302, which allows the fiber optic cable 20 to cover the key stress area, thereby making the monitoring effect more accurate. In addition, fixing the fiber optic cable 20 and the transverse steel reinforcement skeleton 301 by binding or welding brackets can make them fit better, so that when the grid beam is deformed by stress, the fiber optic cable 20 can deform synchronously with it.

[0042] like Figure 9 As shown, to improve the mechanical properties of the optical fiber, the silicone buffer sleeve 201 is made of at least one of silicone, rubber, polyurethane, and polyester fiber. The outer wall of the silicone buffer sleeve 201 is coated with a polyimide coating 202. Since the optical fiber core 204 is wrapped by the capillary pressure-resistant sleeve 203, and the capillary pressure-resistant sleeve 203 is wrapped by the silicone buffer sleeve 201, the capillary pressure-resistant sleeve 203 can provide a certain compressive strength to the optical fiber core 204 by utilizing its own toughness. This makes the optical fiber cable 20 less likely to be damaged by the pressure of the concrete when it is encapsulated in the concrete. In addition, the outer silicone buffer sleeve 201 is made of a high-strength and highly elastic material, which can provide a certain impact resistance to the optical fiber core 204. Compared with the traditional method of simply encapsulating with a heat-shrinkable sleeve, the fiber grating of this device has better mechanical properties and is less likely to be damaged or broken when subjected to pressure and external impact.

[0043] When the frame beam 30 deforms, the outer ring of the polyimide coating 202 is sprayed with polyimide. The polyimide can enhance the elastic modulus of the silicone buffer sleeve 201. After the concrete layer 303 of the frame beam is poured, a certain gradient difference is formed between the elastic modulus of the concrete layer 303 of the frame beam, the anchor rod 41 and the polyimide coating 202. This can reduce the strain transfer reduction caused by the large difference in modulus, thereby improving the strain transfer effect. In addition, the grating at the connection between the anchor rod and the frame beam is protected by a plastic coil 21. The fiber optic grating is multi-layered and protected by the plastic coil 21, so that it can resist pressure and impact, and can also prevent shear damage.

[0044] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0045] Example 3

[0046] As another embodiment, this third embodiment, based on the second embodiment, proposes a construction method for a cooperative deformation structure of a fiber optic grating embedded in an anchor frame grid beam, such as... Figure 1-9 As shown, it includes the following steps:

[0047] Step 1: After measuring and cleaning the slope protection 1, excavate the grid beam trench 5 on the slope protection 1; specifically, as follows... Figure 2 As shown, the slope protection 1 is first measured and cleaned. According to the construction drawings, vertical trenches 51 and horizontal trenches 50 are excavated on the slope protection 1. After the grid beam trenches 5 are excavated, the trenches are cleaned to ensure that there are no impurities inside.

[0048] Step 2: Drill anchor bolt holes 40 in the grid beam trench 5 and fix anchor bolts 41 in the anchor bolt holes 40; specifically, as follows... Figure 2 and Figure 3 As shown, the grid beam trenches 5 are arranged in a crisscross pattern, with the transverse trenches 50 and the longitudinal trenches 51, and the intersection points are called intersection trenches 52. After drilling anchor bolt holes 40 at intersection trenches 52, the inside of the anchor bolt holes 40 is cleaned using high-pressure air. Anchor bolts 41 are then inserted into the anchor bolt holes 40, and grouting is performed on the anchor bolt holes 40. After the grout solidifies, anchor bolt concrete 42 is formed. Further, holes are drilled at intersection trenches 52 to drill anchor bolt holes 40 of appropriate depth according to construction requirements. After the anchor bolt holes 40 are drilled, the inside of the anchor bolt holes 40 needs to be cleaned using high-pressure air to remove impurities and soil seepage left during drilling. Anchor bolts 41 are then inserted into the anchor bolt holes 40, and grouting is performed on the anchor bolt holes 40. After the grout solidifies, anchor bolt concrete 42 is formed, which fixes the anchor bolts 41 in the anchor bolt holes 40.

[0049] Step 3: Install the steel reinforcement frame in the grid beam trench 5, tie the fiber optic cable 20 to the steel reinforcement frame, and extend one end of the fiber optic cable 20 out of the steel reinforcement frame.

[0050] Step 4: Set up formwork 6 around the outermost part of the grid beam trench 5, and pour concrete into the grid beam trench 5 to solidify and form grid beam concrete layer 303.

[0051] Step 5: Use a hydraulic jack to tension the anchor rod 41, cut out the part of the anchor rod 41 that extends out of the concrete layer 303 of the grid beam, and connect one end of the fiber optic cable 20 to the external spectrometer.

[0052] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 2 can be referred to each other, and will not be repeated in this application.

[0053] Example 4

[0054] As another embodiment, this fourth embodiment, based on the third embodiment, proposes a more specific construction method for a cooperative deformation structure of fiber optic grating embedded in an anchor frame beam, such as... Figure 1-9 As shown, it includes the following steps:

[0055] Step 1: After measuring and cleaning the slope protection 1, excavate the grid beam trench 5 on the slope protection 1;

[0056] Step 2: Drill anchor bolt holes 40 in the grid beam trench 5 and fix anchor bolts 41 in the anchor bolt holes 40;

[0057] Step 3: Install the reinforcing steel frame in the grid beam trench 5, tie the fiber optic cable 20 to the reinforcing steel frame, and extend one end of the fiber optic cable 20 out of the reinforcing steel frame; specifically, as follows... Figure 5-8 As shown, the reinforcing steel cage consists of a horizontal reinforcing steel cage 301 and a vertical reinforcing steel cage 302. After the anchor concrete 42 is cured, the vertical reinforcing steel cage 302 is first laid in the vertical trench 51, and then the horizontal reinforcing steel cage 301 is laid in the horizontal trench 50. The horizontal reinforcing steel cage 301 and the vertical reinforcing steel cage 302 are installed crosswise. The positions of the horizontal reinforcing steel cage 301 and the vertical reinforcing steel cage 302 are adjusted so that the anchor 41 passes through the horizontal reinforcing steel cage 301 and the vertical reinforcing steel cage 302. When the optical fiber cable 20 is tied to the reinforcing steel cage, the distance between the optical fiber cables 20 is controlled between 0.5-1.0m, and a pre-tension strain of 0.1% to 0.3% is applied to the optical fiber cable 20.

[0058] Further, after maintaining for a period of time, first lay the vertical steel bar framework 302 in the vertical groove 51, and then lay the horizontal steel bar framework 301 in the horizontal groove 50. The horizontal steel bar framework 301 and the vertical steel bar framework 302 are installed in a cross manner. During installation, the positions of the main steel bars, distribution steel bars, and stress-bearing steel bars in the horizontal steel bar framework 301 and the vertical steel bar framework 302 need to be adjusted according to the position of the anchor rod 41 to ensure that the anchor rod 41 can penetrate through the horizontal steel bar framework 301 and the vertical steel bar framework 302 from the bottom. Before pouring, arrange the FBG array composed of the optical fiber cable 20 on the surface of the main steel bars of the steel bar framework, and fix the support by binding or welding. Lay the optical fiber cable 20 back and forth on the horizontal steel bar framework 301 and the vertical steel bar framework 302. After laying, the optical fiber cable 20 forms a plurality of interconnected "Z" shapes, and the distance between adjacent optical fiber cables 20 is controlled within 0.5 - 1.0 m, so as to cover the key stress-bearing areas. When installing the optical fiber cable 20, a pre-tensile strain of 0.1% - 0.3% needs to be applied to the optical fiber cable 20 to offset the relaxation effect after the initial prestress of the anchor rod is released, so that the grating is consistent with the structural deformation baseline, and one end of the optical fiber cable 20 needs to extend out from the horizontal steel bar framework 301 and the vertical steel bar framework 302, and the other end is fixed in the horizontal steel bar framework 301 and the vertical steel bar framework 302;

[0059] Step Four: Enclose the template 6 around the outermost periphery of the lattice beam groove 5, and pour the concrete into the lattice beam groove 5 to solidify and form the lattice beam concrete layer 303; Specifically, as Figure 5 shown, after installing the optical fiber cable 20, support the template 6 on the sides and the upper side of the horizontal steel bar framework 301 and the vertical steel bar framework 302, and pour the concrete into the horizontal steel bar framework 301 and the vertical steel bar framework 302 surrounded by the template 6. During pouring, vibrate the pouring cavity;

[0060] Further, after installing the optical fiber cable 20, support the template 6 on the sides and the upper side of the horizontal steel bar framework 301 and the vertical steel bar framework 302, and pour the concrete into the horizontal steel bar framework 301 and the vertical steel bar framework 302 surrounded by the template 6, and vibrate the pouring cavity during pouring. After the concrete solidifies, it forms the lattice beam concrete layer 303. The lattice beam concrete layer 303 and the horizontal steel bar framework 301 and the vertical steel bar framework 302 jointly form the frame lattice beam 30;

[0061] Step Five: Use a hydraulic jack to tension the anchor rod 41, cut off the part of the anchor rod 41 that extends out of the lattice beam concrete layer 303, and connect the extended end of the optical fiber cable 20 to an external spectral analyzer; Specifically, as Figure 1As shown, after a period of maintenance, the anchor rod 41 is tensioned by a hydraulic jack. After tensioning, the excess part of the anchor rod 41 is cut off, and one end of the fiber optic cable 20 is connected to an external spectral analyzer. The spectral analyzer analyzes the light path reflection fluctuations and conditions within the fiber optic cable 20 to analyze the stress condition of the grid beam. At the same time, a Bluetooth or cloud processing module is set up so that the data can be transmitted to the platform for monitoring in real time.

[0062] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 3 can be referred to each other, and will not be repeated in this application.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A cooperative deformation structure for fiber optic grating embedded in an anchor frame grid beam, characterized in that, include: Slope protection, fiber optic sensing devices, frame grid beams, anchor support modules, and grid beam trenches; The grid beam trench is excavated within the slope protection; the anchor bolt support module includes anchor bolt holes and anchor bolts, with the anchor bolt holes excavated within the grid beam trench and the anchor bolts fixed within the anchor bolt holes; the frame grid beam is located within the grid beam trench and includes a steel reinforcement skeleton and a grid beam concrete layer; the grid beam concrete layer is poured within the steel reinforcement skeleton, and the grid beam concrete layer and anchor bolts are fixed together; the fiber optic sensing device includes fiber optic cables and plastic coils, with the fiber optic cables fixed to the steel reinforcement skeleton and the plastic coils sleeved at the corners of the fiber optic cables.

2. The cooperative deformation structure of the fiber optic grating embedded in the anchor frame grid beam according to claim 1, characterized in that, The grid beam trench includes transverse trenches, vertical trenches, and intersecting trenches; transverse trenches are opened horizontally on the slope, vertical trenches are opened vertically on the slope, and the intersection of transverse and vertical trenches is called intersecting trench.

3. The cooperative deformation structure of the fiber optic grating embedded in the anchor frame grid beam according to claim 2, characterized in that, The reinforcing steel cage includes a horizontal reinforcing steel cage and a vertical reinforcing steel cage; the horizontal reinforcing steel cage is fixedly installed in a horizontal trench, and the vertical reinforcing steel cage is fixedly installed in a vertical trench. The intersection of the horizontal and vertical reinforcing steel cages is located in a cross trench.

4. The cooperative deformation structure of the fiber optic grating embedded in the anchor frame grid beam according to claim 2, characterized in that, The anchor bolt holes are opened in the cross grooves; one end of the anchor bolt is fixed in the anchor bolt hole by the anchor bolt concrete poured in the anchor bolt hole, and the other end of the anchor bolt passes through the concrete layer of the fixed grid beam.

5. The cooperative deformation structure of the fiber optic grating embedded in the anchor frame grid beam according to claim 3, characterized in that, The optical fiber cable includes a silicone buffer sleeve, a polyimide coating, a capillary compression-resistant sleeve, and an optical fiber core. A capillary compression-resistant sleeve is fixedly fitted on the outside of the optical fiber core, and a silicone buffer sleeve is fixedly fitted on the outside of the capillary compression-resistant sleeve. The outer wall of the silicone buffer sleeve is coated with a polyimide coating. The optical fiber cable is tied to the horizontal reinforcing steel frame and is folded back and forth along the horizontal and vertical reinforcing steel frames. The optical fiber cable is arranged in multiple interconnected "V" shapes. One end of the optical fiber cable extends out of the grid beam concrete layer, and the rest of the optical fiber cable is embedded in the grid beam concrete layer.

6. A construction method for a cooperative deformation structure of a fiber optic grating embedded in an anchor frame grid beam as described in claim 1, characterized in that, Includes the following steps: Step 1: After measuring and cleaning the slope, excavate the grid beam trench on the slope. Step 2: Drill anchor holes in the grid beam trench and fix the anchors in the anchor holes; Step 3: Install the steel reinforcement cage in the grid beam trench, tie the fiber optic cable to the steel reinforcement cage, and extend one end of the fiber optic cable out of the steel reinforcement cage. Step 4: Set up a formwork around the outermost edge of the grid beam trench, and pour concrete into the grid beam trench to solidify and form the grid beam concrete layer. Step 5: Use a hydraulic jack to tension the anchor rod, cut out the part of the anchor rod that extends out of the concrete layer of the grid beam, and connect one end of the fiber optic cable to an external spectrometer.

7. The construction method of the synergistic deformation structure of the fiber optic grating embedded in the anchor frame grid beam according to claim 6, characterized in that, In step two, the grid beam trenches are arranged in a crisscross pattern, with the horizontal ones being horizontal trenches and the vertical ones being vertical trenches, and the intersections being cross trenches. After drilling anchor bolt holes at the cross trenches, the inside of the anchor bolt holes is cleaned using high-pressure air, the anchor bolts are inserted into the anchor bolt holes, and the anchor bolt holes are grouted. After the grout solidifies, it forms anchor bolt concrete.

8. The construction method of the cooperative deformation structure of fiber optic grating embedded in anchor frame grid beam according to claim 7, characterized in that, In step three, the reinforcing steel cage consists of a horizontal reinforcing steel cage and a vertical reinforcing steel cage. After the anchor bolt concrete is cured, the vertical reinforcing steel cage is first laid in the vertical trench, and then the horizontal reinforcing steel cage is laid in the horizontal trench. The horizontal and vertical reinforcing steel cages are installed crosswise. The positions of the horizontal and vertical reinforcing steel cages are adjusted so that the anchor bolt passes through the horizontal and vertical reinforcing steel cages.

9. The construction method of the synergistic deformation structure of the fiber optic grating embedded in the anchor frame grid beam according to claim 6, characterized in that, In step three, when binding the optical fiber cables to the steel reinforcement frame, the distance between the optical fiber cables is controlled between 0.5 and 1.0 m, and a pre-tension strain of 0.1% to 0.3% is applied to the optical fiber cables.

10. The construction method of the synergistic deformation structure of the fiber optic grating embedded in the anchor frame grid beam according to claim 7, characterized in that, In step four, after the fiber optic cable is installed, the formwork is supported on the sides and top of the horizontal and vertical steel reinforcement cages, and concrete is poured into the horizontal and vertical steel reinforcement cages enclosed by the formwork. The pouring cavity is vibrated during the pouring process.

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