A surface deformation optical fiber detection equipment for natural gas pipeline construction

Abstract

The present application relates to the technical field of ground deformation optical fiber detection, in particular to a kind of ground deformation optical fiber detection equipment for natural gas pipeline construction, including installation frame, and the composite modem instrument being installed in its upper groove, and the distributed optical fiber deformation sensing port of composite modem instrument front side is connected with test optical fiber, the inside of installation frame is connected with installation base plate by regulating component, and the bottom surface of installation base plate is fixed with second fixed cone, and the outside of test optical fiber is connected with the ground to be detected by connecting component, and the upper portion of connecting component is connected with first support plate by pushing component.This ground deformation optical fiber detection equipment for natural gas pipeline construction not only facilitates the installation of the entire ground deformation optical fiber detection equipment, but also allows the test optical fiber to be in close contact with the ground surface, improving the stability of the installation, thus improving the accuracy of the test optical fiber in detecting ground deformation.

Description

Technical Field

[0001] This invention relates to the field of optical fiber detection technology for surface deformation, specifically to an optical fiber detection device for surface deformation during natural gas pipeline construction. Background Technology

[0002] Since excavation work will disrupt the original stress balance of the strata, it is necessary to monitor the surface deformation in real time during the construction of natural gas pipelines to avoid affecting the safety of the subsequent construction of natural gas pipelines. Currently, there are fiber optic surface deformation detection devices on the market that use fiber optic technology to detect surface deformation, thereby facilitating the monitoring of whether the excavation process will cause the surrounding surface to subside.

[0003] For example, the patent application published in the prior art with publication number "CN116124025A" entitled "Deformation Monitoring System and Method Based on Distributed Optical Fiber or Arrayed Grating Optical Fiber" discloses connecting the first end of the distributed deformation sensing optical fiber or arrayed deformation sensing grating optical fiber of the deformation measurement or monitoring armored optical cable to the deformation sensing optical fiber signal input end of the composite modulation and demodulation instrument, and connecting the first ends of the two multimode optical fibers of the deformation measurement or monitoring armored optical cable to the temperature sensing dual-ended optical fiber signal input end of the composite modulation and demodulation instrument. The composite modulation and demodulation instrument is then activated to continuously measure or monitor the deformation signal of the deformation measurement or monitoring armored optical cable deployed underground, on the seabed, on the outer surface of large foundation structures, or on the outer surface of pipelines in real time. Modulation and demodulation are performed simultaneously on the two multimode optical fibers to detect real-time temperature changes along the fiber optic lines. For example, the patent application with publication number "CN106338253A" entitled "A Distributed Optical Fiber Detection Device and Detection Method for Underwater Collapse on the Surface of a Dam" discloses that, firstly, the size of underwater collapse on the surface of the dam to be detected is determined, and an optical fiber two-dimensional sensing unit of appropriate length and width is selected. Then, the stainless steel counterweight and rollers of the two-dimensional sensing unit are lowered from the surface of the dam so that the optical fiber two-dimensional sensing unit can be spread out and completely cover the surface to be detected. The optical fiber two-dimensional sensing unit is connected to the PPP-BOTDA and analysis and display system to monitor the strain of the two-dimensional sensing unit optical fiber deployed on the surface of the dam.

[0004] In the aforementioned existing surface deformation fiber optic detection equipment, the stainless steel counterweight and rollers of the two-dimensional sensing unit are lowered from the dam surface to allow the fiber optic two-dimensional sensing unit to spread and completely cover the surface to be detected. This results in the fiber optic two-dimensional sensing unit only spreading and adhering to the surface to be detected. When encountering strong winds, the tightness of the adhesion between the fiber optic two-dimensional sensing unit and the surface to be detected will be affected, thus affecting the accuracy of subsequent surface deformation detection. Therefore, we propose a surface deformation fiber optic detection equipment for natural gas pipeline construction to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a fiber optic surface deformation detection device for natural gas pipeline construction, in order to solve the problem mentioned in the background art. Currently available fiber optic surface deformation detection devices on the market involve lowering the stainless steel counterweight and rollers of the two-dimensional sensing unit from the dam surface, allowing the fiber optic two-dimensional sensing unit to spread and completely cover the surface to be detected. This results in the fiber optic two-dimensional sensing unit only spreading and adhering to the surface, which, in windy weather, affects the tightness of the adhesion between the fiber optic two-dimensional sensing unit and the surface to be detected, thus affecting the accuracy of subsequent surface deformation detection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fiber optic detection device for surface deformation in natural gas pipeline construction, comprising a mounting frame and a composite modulation and demodulation instrument installed in a groove above it, wherein the distributed fiber optic deformation sensing port on the front side of the composite modulation and demodulation instrument is connected to a test fiber, the mounting frame is connected to a mounting base plate through a control component, and a second fixing cone is fixed on the bottom surface of the mounting base plate, the rear end of the test fiber penetrates the front side of the mounting frame, and a row of first support plates and second support plates are installed on the front side of the mounting frame, and the outer side of the test fiber is connected to the surface to be detected through a connecting component, and the top of the connecting component is connected to the first support plate through a pushing component, and a laser rangefinder is connected to the right side of the second support plate.

[0007] Preferably, sliders are fixed on both the left and right sides of the mounting base plate, limit guides are installed in the slots opened on both the left and right sides of the mounting frame, and limit guides are provided through the inside of the sliders. A row of rack and pinion assemblies is fixed on the upper surface of the mounting base plate.

[0008] Preferably, the connection assembly includes a fixing block fixed on the outer side above the test optical fiber, the fixing block being arc-shaped, and a first fixing cone for insertion into the ground surface to be tested is symmetrically mounted on the bottom surface of the fixing block.

[0009] Preferably, a rotating rod is installed in a slot on the bottom surface of the first support plate. The pushing assembly includes a pushing block installed on the outside of the rotating rod. A connecting frame in the shape of an inverted "L" is fixed above the fixing block. The four corners of the connecting frame are connected to the bottom surface of the first support plate by manual telescopic rods. A pushing block is provided above the connecting frame. The connecting frame forms a lifting structure through the pushing block. The rear end of the rotating rod passes through the rear side of the first support plate and the front side of the mounting frame. A transmission gear is installed at the rear end of the rotating rod. The transmission gear meshes with the rack assembly on the left side.

[0010] Preferably, a single-turn reciprocating screw is installed in the groove on the right side of the second support plate, and a mounting base is threaded to the outer side of the single-turn reciprocating screw. A laser rangefinder is fixed to the outer side of the mounting base. The rear end of the single-turn reciprocating screw passes through the rear side of the second support plate and is inserted into the mounting frame. The rear end of the leftmost single-turn reciprocating screw passes through the rear side of the mounting frame. The four single-turn reciprocating screws located in the mounting frame form a transmission structure through a sprocket assembly.

[0011] Preferably, the control component includes an electric push rod installed inside the middle of the mounting frame, and the output end of the electric push rod is connected to the mounting base plate.

[0012] Preferably, a second support plate is installed on the right side of the first support plate, and the first support plate and the second support plate are arranged in a one-to-one correspondence.

[0013] Preferably, the control component includes a return spring mounted above the slider, and the return spring is sleeved on the outside of the limiting guide rod.

[0014] Preferably, a control frame is provided on the rear side of the mounting frame, and the left and right ends of the control frame are respectively inserted into the slots opened on the left and right sides of the mounting frame. The left and right ends of the control frame are respectively connected to two sliders. A U-shaped through slot is opened in the middle of the control frame, and the sliders form a lifting structure through a return spring.

[0015] Preferably, a self-control rod is installed on the rear side of the mounting frame, and a support block is fixed below the self-control rod. The width of the support block is smaller than the diameter of the self-control rod, and the diameter of the self-control rod is smaller than the width of the through groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This surface deformation fiber optic detection equipment for natural gas pipeline construction not only facilitates the rapid installation and placement of the entire surface deformation fiber optic detection equipment, but also allows the test fiber to be in close contact with the surface, improving the stability of the installation. Therefore, it can improve the accuracy of the test fiber in detecting surface deformation. The specific details are as follows:

[0017] (1) The mounting base plate is lowered by adjusting the components, so that the second fixed cone is inserted into the ground surface. At the same time, the mounting base plate drives the rack assembly to lower, which in turn drives the rotating rod and transmission gear to rotate. Therefore, the rotating rod drives the push block to rotate from a horizontal position to a vertical position. The push block automatically pushes the connecting frame and the fixed block to move downward, so that the first fixed cone on the bottom surface of the fixed block is inserted into the ground surface. With the above structure, it is not only convenient to quickly install and place the entire ground surface deformation fiber optic detection equipment, but also to make the test fiber closely contact the ground surface, improve the stability of the installation, and thus improve the accuracy of the test fiber in detecting ground surface deformation.

[0018] Furthermore, by using an external motor to drive a single-rotor reciprocating screw to rotate, the single-rotor reciprocating screw drives the mounting base and laser rangefinder to move back and forth. This allows the laser rangefinder to assist in detecting surface deformation, thereby further improving the detection accuracy of the entire detection equipment.

[0019] (2) The control component is an electric push rod, which can automatically drive the mounting base plate to rise and fall, making it easy to quickly install and disassemble the entire testing equipment and operate conveniently;

[0020] (3) The control component is a reset spring. The storage force of the reset spring can automatically drive the mounting base plate to descend. No power source is required, which can save energy and meet different usage needs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention installed on the ground surface;

[0022] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0023] Figure 3 This is a bottom view of the mounting frame structure of the present invention;

[0024] Figure 4 This is a top sectional view of the mounting frame of the present invention;

[0025] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0026] Figure 6 This is a bottom view of the second support plate structure of the present invention;

[0027] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B;

[0028] Figure 8 This is a schematic cross-sectional view of the first support plate of the present invention;

[0029] Figure 9 This is a schematic diagram of the three-dimensional structure of the mounting frame in Embodiment 2 of the present invention;

[0030] Figure 10 This is a schematic diagram of the rear view of the mounting frame in Embodiment 2 of the present invention;

[0031] Figure 11 This is a schematic cross-sectional view of the mounting frame in Embodiment 2 of the present invention;

[0032] Figure 12 This is a schematic diagram of the three-dimensional structure of the control frame of the present invention.

[0033] In the diagram: 1. Mounting frame; 2. Composite modulation and demodulation instrument; 3. Test fiber optic cable; 4. First support plate; 5. Second support plate; 6. Laser rangefinder; 61. Mounting base; 7. Fixing block; 71. First fixing cone; 8. Single-rotor reciprocating screw; 9. Mounting base plate; 91. Second fixing cone; 10. Electric push rod; 11. Sprocket assembly; 12. Slider; 13. Limiting guide rod; 131. Return spring; 14. Rotating rod; 141. Transmission gear; 142. Push block; 15. Rack assembly; 16. Connecting frame; 161. Manual telescopic rod; 17. Control frame; 171. Through slot; 18. Self-control rod; 181. Support block. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-12 The present invention provides the following technical solution:

[0036] Example 1: The surface deformation fiber optic detection equipment for natural gas pipeline construction in this example not only facilitates quick installation and disassembly of the entire detection equipment, but also improves the stability of the entire installation, ensuring that the test fiber 3 is in close contact with the surface. This improves the accuracy of subsequent detection. See attached diagram for the specific structure. Figures 1-8As shown, the system includes a mounting frame 1 and a composite modulation and demodulation instrument 2 installed in a groove above it. The distributed fiber optic deformation sensing port on the front side of the composite modulation and demodulation instrument 2 is connected to the test fiber 3. A mounting base plate 9 is connected to the interior of the mounting frame 1 via a control assembly, and a second fixing cone 91 is fixed to the bottom surface of the mounting base plate 9. The rear end of the test fiber 3 penetrates the front side of the mounting frame 1, and a row of first support plates 4 and second support plates 5 are installed on the front side of the mounting frame 1. The outer side of the test fiber 3 is connected to the ground surface to be tested via a connecting assembly, and the top of the connecting assembly is connected to the first support plate 4 via a pushing assembly. The second support plate 5... A laser rangefinder 6 is connected to the right side of plate 5. Slider 12s are fixed on both the left and right sides of mounting base plate 9. Limiting guide rods 13 are installed in the slots on both the left and right sides of mounting frame 1, and the limiting guide rods 13 are installed through the inside of slider 12. A row of rack and pinion assemblies 15 is fixed on the upper surface of mounting base plate 9. The connecting assembly includes a fixing block 7 fixed on the outer side above the test optical fiber 3. The fixing block 7 is arc-shaped, and a first fixing cone 71 for insertion into the ground surface to be tested is symmetrically installed on the bottom surface of the fixing block 7. A rotating rod 14 is installed in the slot on the bottom surface of the first support plate 4. The pushing assembly includes a pushing block 14 installed on the outer side of the rotating rod 14. 2. A connecting frame 16 in the shape of an inverted "L" is fixed above the fixing block 7. The four corners of the connecting frame 16 are connected to the bottom surface of the first support plate 4 via manual telescopic rods 161. A pushing block 142 is provided above the connecting frame 16, forming a lifting structure. The rear end of the rotating rod 14 passes through the rear side of the first support plate 4 and the front side of the mounting frame 1. A transmission gear 141 is installed at the rear end of the rotating rod 14, and the transmission gear 141 meshes with the rack assembly 15 on the left side. A single-turn reciprocating screw 8 is installed in the groove on the right side of the second support plate 5. An outer threaded connection is provided with a mounting base 61, and a laser rangefinder 6 is fixed to the outer side of the mounting base 61. The rear end of the single-turn reciprocating screw 8 passes through the rear side of the second support plate 5 and is inserted into the mounting frame 1. The rear end of the leftmost single-turn reciprocating screw 8 passes through the rear side of the mounting frame 1. The four single-turn reciprocating screws 8 located in the mounting frame 1 form a transmission structure through a sprocket assembly 11. The control component includes an electric push rod 10 installed in the middle of the mounting frame 1, and the output end of the electric push rod 10 is connected to the mounting base plate 9. A second support plate 5 is installed on the right side of the first support plate 4. The first support plate 4 and the second support plate 5 are set in a one-to-one correspondence.

[0037] During the construction of the natural gas pipeline, an installation trench for the later placement of the natural gas pipeline is first excavated in the construction area. Then, the entire surface deformation fiber optic detection equipment is moved to the side of the installation trench, and the installation frame 1 is placed on the ground away from the installation trench. At this time, the test fiber optic cable 3 is on the ground near the installation trench. Then, the worker holds the installation frame 1 and starts the electric push rod 10 in the control component. At this time, the output end of the electric push rod 10 drives the installation base plate 9 in the installation frame 1 to move downward. The sliders 12 on the left and right sides of the installation base plate 9 slide downward outside the limit guide rod 13. When the installation base plate 9 moves downward, the second fixing cone 91 on the bottom surface is inserted into the ground. At the same time, the installation base plate 9 drives the upper installation... A row of rack and pinion assemblies 15 moves downward together. When the rack and pinion assemblies 15 move downward, they drive the transmission gear 141, which is meshed with the corresponding position, to rotate. The transmission gear 141 drives the rotating rod 14 to rotate. When the rotating rod 14 rotates, it drives the pushing block 142 to rotate, so that the pushing block 142 rotates from a horizontal state to a vertical state. The pushing block 142 pushes the connecting frame 16 downward. At this time, the manual telescopic rod 161 is stretched to a certain length, ensuring that the connecting frame 16 stably drives the fixing block 7 and the test optical fiber 3 to move downward. At this time, the test optical fiber 3 is in close contact with the ground surface, and the first fixing cone 71 is inserted into the ground surface. Therefore, it is convenient to quickly and stably install the entire testing equipment and operate it conveniently.

[0038] Then the entire detection equipment can detect surface deformation. When vertical displacement deformation occurs on the ground near the excavated installation trench, the soil near the installation trench sinks downwards, while the soil away from the installation trench does not sink downwards. This ensures the stable installation of the installation frame 1. Then, the soil near the installation trench causes the fixing block 7, the first fixing cone 71, and the corresponding test optical fiber 3 to sink and move downwards together. At this time, the manual telescopic rod 161 continues to be stretched, and the test optical fiber 3 will be stretched, causing the optical signal to change. The composite modulation and demodulation instrument 2 monitors the changed optical signal in the test optical fiber 3 and converts the optical signal into an electrical signal. The monitoring data is transmitted to the external terminal through the wireless transmission module. Therefore, the deformation data of the ground can be obtained in real time, and the surface deformation can be detected. Since this part is existing technology, it will not be described in detail here.

[0039] Meanwhile, the rear end of the leftmost single-turn reciprocating screw 8 can be connected to an external motor via a coupling. The motor drives the leftmost single-turn reciprocating screw 8 to rotate. The leftmost single-turn reciprocating screw 8 drives the three sets of single-turn reciprocating screws 8 on the right side to rotate together via the sprocket assembly 11, thus causing all four sets of single-turn reciprocating screws 8 to rotate together. When the single-turn reciprocating screw 8 rotates, it drives the mounting base 61 connected to the outer thread to move back and forth. The mounting base 61 drives the laser rangefinder 6 to move back and forth. Then, the laser rangefinder 6, which moves back and forth, detects the distance between itself and the ground surface. The laser rangefinder 6 transmits this signal to an external terminal via a wireless transmission module. The terminal analyzes and compares the data to determine whether there is subsidence or deformation of the ground surface near the mounting groove. Therefore, the laser rangefinder 6 can further assist in the detection of large deformations of the ground surface. At the same time, when the test fiber optic cable 3 is damaged, the laser rangefinder 6 can also perform detection work, thereby further improving the accuracy of detection and meeting different usage needs.

[0040] Example 2: The surface deformation fiber optic detection equipment for natural gas pipeline construction in this example discloses a different control component structure based on Example 1. The control component in Example 2 does not require a power source, saving energy and meeting different usage requirements. The specific structure is shown in the attached diagram. Figures 9-12 As shown, the control assembly includes a return spring 131 installed above the slider 12, and the return spring 131 is sleeved on the outside of the limit guide rod 13. A control frame 17 is provided on the rear side of the mounting frame 1, and the left and right ends of the control frame 17 are respectively inserted into the slots opened on the left and right sides of the mounting frame 1. The left and right ends of the control frame 17 are respectively connected to the two sliders 12. A U-shaped through groove 171 is opened in the middle of the control frame 17, which is U-shaped. The slider 12 forms a lifting structure through the return spring 131. A self-control rod 18 is installed on the rear side of the mounting frame 1, and a support block 181 is fixed below the self-control rod 18. The width of the support block 181 is smaller than the diameter of the self-control rod 18, and the diameter of the self-control rod 18 is smaller than the width of the through groove 171.

[0041] When installing the entire testing equipment, the worker holds the mounting frame 1 and manually rotates the self-control lever 18. The self-control lever 18 rotates the support block 181 90°, at which point the support block 181 is set vertically to the mounting frame 1. Then, the stored force of the reset spring 131 in the control component automatically drives the slider 12 to move downward outside the limit guide rod 13. The slider 12 drives the control frame 17 to move downward. At this time, the lower end of the self-control lever 18 and the support block 181 pass through the through groove 171, without affecting the descent of the control frame 17. At the same time, the slider 12 drives the mounting base plate 9 and the second fixing cone 91 to move downward, so that the second fixing cone 91 is inserted into the ground surface for installation and fixation. Then, as shown in Embodiment 1, it can be installed... After the entire testing equipment is stably installed, when it is necessary to disassemble and separate the testing equipment from the ground, simply move the control frame 17 upward manually. The control frame 17 drives the slider 12 and the mounting base plate 9 to move upward. At this time, the return spring 131 is compressed and stored, and the second fixed cone 91 moves upward and separates from the ground. Then, manually rotate the self-control lever 18 in the opposite direction by 90°, so that the support block 181 rotates to directly below the control frame 17. At this time, the support block 181 supports and limits the lower surface of the control frame 17, preventing the control frame 17 from moving downward. Therefore, the entire testing equipment can be disassembled for future use, meeting different usage needs and completing a series of tasks.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surface deformation fiber optic detection device for natural gas pipeline construction, comprising a mounting frame (1) and a composite modulation and demodulation instrument (2) installed in a groove above it, wherein the distributed fiber optic deformation sensing port on the front side of the composite modulation and demodulation instrument (2) is connected to a test fiber (3), characterized in that: The mounting frame (1) is connected to the mounting base plate (9) via an adjustment component. A second fixing cone (91) is fixed to the bottom surface of the mounting base plate (9). The rear end of the test optical fiber (3) passes through the front side of the mounting frame (1). A row of first support plates (4) and second support plates (5) are installed on the front side of the mounting frame (1). The outer side of the test optical fiber (3) is connected to the ground surface to be tested via a connecting component. The top of the connecting component is connected to the first support plate (4) via a pushing component. A laser rangefinder (6) is connected to the right side of the second support plate (5). Slider blocks (12) are fixed on both the left and right sides of the mounting base plate (9). Limiting guide rods (13) are installed in the slots opened on both the left and right sides of the mounting frame (1). Limiting guide rods (13) are installed through the inside of the sliders (12). A row of rack components (15) is fixed on the upper surface of the mounting base plate (9). The connecting component includes a fixed component on the outer side above the test optical fiber (3). The fixed block (7) is arc-shaped, and the bottom surface of the fixed block (7) is symmetrically equipped with a first fixed cone (71) for insertion into the ground surface to be tested. The bottom surface of the first support plate (4) is slotted and equipped with a rotating rod (14). The pushing assembly includes a pushing block (142) installed on the outside of the rotating rod (14). The fixed block (7) is fixed with a connecting frame (16) in the shape of an inverted "L". The four corners of the upper part of the connecting frame (16) are connected to the bottom surface of the first support plate (4) through a manual telescopic rod (161). The connecting frame (16) is equipped with a pushing block (142) on the upper part. The connecting frame (16) forms a lifting structure through the pushing block (142). The rear end of the rotating rod (14) passes through the rear side of the first support plate (4) and the front side of the mounting frame (1). The rear end of the rotating rod (14) is equipped with a transmission gear (141). The transmission gear (141) meshes with the rack assembly (15) on the left side.

2. The fiber optic detection equipment for surface deformation during natural gas pipeline construction according to claim 1, characterized in that: A single-turn reciprocating screw (8) is installed in the groove on the right side of the second support plate (5), and a mounting base (61) is threaded to the outside of the single-turn reciprocating screw (8). A laser rangefinder (6) is fixed to the outside of the mounting base (61). The rear end of the single-turn reciprocating screw (8) passes through the rear side of the second support plate (5) and is inserted into the mounting frame (1). The rear end of the leftmost single-turn reciprocating screw (8) passes through the rear side of the mounting frame (1). The four single-turn reciprocating screws (8) located in the mounting frame (1) form a transmission structure through a sprocket assembly (11).

3. The fiber optic detection equipment for surface deformation during natural gas pipeline construction according to claim 1, characterized in that: The control component includes an electric push rod (10) installed inside the middle of the mounting frame (1), and the output end of the electric push rod (10) is connected to the mounting base plate (9).

4. The fiber optic detection equipment for surface deformation during natural gas pipeline construction according to claim 1, characterized in that: A second support plate (5) is installed on the right side of the first support plate (4), and the first support plate (4) and the second support plate (5) are set in a one-to-one correspondence.

5. The fiber optic detection equipment for surface deformation during natural gas pipeline construction according to claim 1, characterized in that: The control component includes a reset spring (131) mounted above the slider (12), and the reset spring (131) is sleeved on the outside of the limiting guide rod (13).

6. The fiber optic detection equipment for surface deformation during natural gas pipeline construction according to claim 5, characterized in that: The rear side of the mounting frame (1) is provided with a control frame (17), and the left and right ends of the control frame (17) are respectively inserted into the slots opened on the left and right sides of the mounting frame (1). The left and right ends of the control frame (17) are respectively connected to two sliders (12). The control frame (17) in the shape of "U" has a through slot (171) in the shape of "U" in the middle. The slider (12) forms a lifting structure through a return spring (131).

7. The fiber optic detection equipment for surface deformation during natural gas pipeline construction according to claim 6, characterized in that: The rear side of the mounting frame (1) is equipped with a self-control rod (18), and a support block (181) is fixed below the self-control rod (18). The width of the support block (181) is smaller than the diameter of the self-control rod (18), and the diameter of the self-control rod (18) is smaller than the width of the through groove (171).

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