Lossless fixing device suitable for duct piece and application

Abstract

The invention provides a lossless fixing device suitable for a duct piece. A fixing piece comprises a fixing rod and a fixing piece which is arranged at the bottom end of the fixing rod in a sleeving mode and fixed to the bottom end of the fixing rod. The fixing plug is movably sleeved with the fixing rod in the axial direction and is in a frustum shape, and the small end of the fixing plug is close to the bottom end of the fixing rod. One end of each expansion sheet is rotationally connected with the fixing sheet, and the other end of each expansion sheet extends towards the top end of the fixing rod, is distributed around the fixing sheet and is in contact with the outer wall of the fixing plug to form a mounting space; the limiting axial part is arranged on the fixing part and located on the side where the large end of the fixing plug is located and can limit the fixing plug in the axial position, so that the fixing plug pushes the expansion piece to expand outwards to make contact with a positioning hole in the duct piece to be fixed. In the mounting and dismounting process, the duct piece cannot be damaged, lossless mounting and dismounting are achieved, the structural integrity of the duct piece is effectively protected, the service life of the duct piece is prolonged, and the duct piece is particularly suitable for projects with the high requirement for structural protection. The lossless fixing device can be repeatedly installed and used.

Description

Technical Field

[0001] This invention relates to the field of engineering measurement auxiliary tools, and more particularly to non-destructive fixing devices and non-destructive fixing kits suitable for tunnel segments. Background Technology

[0002] In tunnel and bridge construction, engineering surveying is a crucial step in ensuring construction accuracy and project quality. The establishment of survey control points and high-altitude surveying formwork suspension points is of great significance for accurately obtaining the geometric information of the engineering structure, guiding construction, and monitoring deformation. Traditional fixing methods typically have the following problems:

[0003] Damage to precast components: Some fixing methods require drilling, enlarging holes or using chemical anchors in precast components. These operations can damage the structural integrity of precast components, affecting their service life and safety. Especially for precast components such as tunnel segments, damage is difficult to repair and may cause safety hazards.

[0004] Installation and removal are inconvenient: Some fixed devices have complex structures, requiring specialized tools and significant time for installation and removal. The cumbersome operation reduces the efficiency of engineering surveying and increases labor and time costs. For example, some devices fixed by welding require cutting during removal, which not only damages the components but also generates noise and pollution.

[0005] Insecure and unreliable fixing: Some existing fixing devices are prone to loosening and displacement during measurement, leading to inaccurate measurement data and affecting the quality of engineering measurements and construction progress. Especially in the fixing of hanging basket suspension points at high altitudes, insecure devices may cause safety accidents such as the hanging basket tipping over.

[0006] Low reusability: Most traditional fixed devices are difficult to reuse multiple times due to the destructive nature of their installation or their own structural limitations, resulting in resource waste and increased engineering surveying costs.

[0007] In summary, existing methods for fixing measurement control points and hanging basket suspension points suffer from problems such as structural damage, inconvenient installation and dismantling, unreliable fixing, and low reusability. These methods cannot meet the requirements of modern tunnel and bridge engineering surveying for non-destructive, efficient, stable, and reusable fixing devices for measuring equipment. Summary of the Invention

[0008] The main objective of this invention is to provide a non-destructive fixing device and non-destructive fixing kit suitable for tunnel segments, so as to solve the technical problems of conventional fixing methods causing damage to the structure, inconvenient installation and removal, unreliable fixing, and low reusability.

[0009] To achieve the above objectives, the present invention provides a non-destructive fixing device suitable for tunnel segments, comprising:

[0010] The fastener includes a fixing rod and a fixing piece sleeved and fixed to the bottom end of the fixing rod.

[0011] A fixing plug is axially movably fitted inside the fixing rod. The fixing plug is frustoconical in shape, with its small end close to the bottom end of the fixing rod.

[0012] At least two expansion plates, each having one end rotatably connected to the fixed plate and the other end extending toward the top of the fixed rod, are distributed around the fixed plate and contact the outer wall of the fixed plug to form an installation space.

[0013] An axial limiting component is provided on the fixing component on the side where the large end of the fixing plug is located. It can limit the axial position of the fixing plug, so that the fixing plug pushes the expansion piece to expand outward and contact the positioning hole on the tube to fix it.

[0014] According to the embodiments of this application, the number of expansion plates is 3 to 5, and each expansion plate is hinged to the fixed plate at one end.

[0015] According to an embodiment of this application, a rubber pad is also provided corresponding to each of the expansion pieces, and the rubber pad is disposed on the surface of the expansion piece away from the fixing plug.

[0016] According to an embodiment of this application, a return spring is also included, which is sleeved on the fixing rod and located between the fixing plate and the fixing plug.

[0017] According to an embodiment of this application, the fixing rod is a screw rod, and the fixing plate is sleeved on the tail end of the screw rod and fixed by a fixing nut.

[0018] According to an embodiment of this application, the diameter of the return spring is larger than that of the fixing nut and smaller than that of the fixing plate.

[0019] According to an embodiment of this application, a circumferential elastic element is further included, which is disposed around the circumference of the at least two expansion plates to constrain the expansion plates and fix the fixing plug.

[0020] According to an embodiment of this application, the limiting axial component is a limiting nut, which is fixed on the fixing rod.

[0021] According to an embodiment of this application, it also includes a mounting nut disposed on the fixed rod for mounting the measuring tool.

[0022] This application also provides an application of the above-mentioned non-destructive fixing device for tunnel segments in tunnel segment construction, including the following steps:

[0023] Insert the non-destructive fixing device into the positioning hole on the inner wall of the tube segment, and push the fixing plug toward the bottom end of the fixing rod, so that the expansion plate expands outward and contacts the positioning hole on the tube segment.

[0024] The axial limiting component is used to fix the fixing plug, so that the expansion plate and the positioning hole on the tube remain in contact.

[0025] Connect the measuring tools to the non-destructive fixing device to perform the measuring operation.

[0026] After completing the measurement work, loosen the limiting axial component and remove the non-destructive fixing mechanism.

[0027] In the aforementioned non-destructive fixing device for tunnel segments, a fixing plug is inserted into the positioning hole in the inner wall of the tunnel segment, pushing the fixing rod towards the bottom end, causing the expansion plate to expand outward and contact the positioning hole on the tunnel segment. The fixing plug is fixed by a limiting axial member, ensuring contact between the expansion plate and the positioning hole on the tunnel segment. Measuring tools are connected to the non-destructive fixing device for measurement work. When removal is required, the limiting axial member is loosened, and the non-destructive fixing mechanism is removed. During installation and disassembly, no damage is caused to the tunnel segment, achieving non-destructive installation and removal, effectively protecting the structural integrity of the tunnel segment, and extending its service life. It is particularly suitable for projects with high structural protection requirements. This non-destructive fixing device can be repeatedly installed and used. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a side view of a non-destructive fixing device for pipe segments according to an embodiment of this application.

[0030] Figure 2 This is a top view of a non-destructive fixing device for pipe segments according to one embodiment of this application.

[0031] Figure 3 This is a partial structural schematic diagram of a non-destructive fixing device for pipe segments according to an embodiment of this application.

[0032] Figure 4 This is a schematic diagram of the non-destructive fixing device for pipe segments according to one embodiment of this application.

[0033] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0034] 100. Fastener; 200. Fixing plug; 300. Expansion plate; 400. Axial limiting component; 500. Rubber pad;

[0035] 110. Fixing rod; 120. Fixing plate; 130. Fixing nut; 140. Mounting nut; 410. Limiting nut; 10. Tube segment; 20. Positioning hole; 30. Non-destructive fixing device; 40. Measuring tool. Detailed Implementation

[0036] 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 a part of the embodiments of the present invention, and not all of them. 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.

[0037] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0038] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0039] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0040] The first aspect of this application provides a non-destructive fixing device 30 suitable for segments 10, as described above. Figures 1-4The device includes a fixing member 100, a fixing plug 200, at least two expansion plates 300, and a limiting axial member 400. The fixing member 100 includes a fixing rod 110 and a fixing plate 120 sleeved and fixed to the bottom end of the fixing rod 110. The fixing plug 200 is axially movably sleeved within the fixing rod 110, and is frustoconical in shape, with its smaller end near the bottom end of the fixing rod 110. Each of the at least two expansion plates 300 has one end rotatably connected to the fixing plate 120, and the other end extends towards the top end of the fixing rod 110. The at least two expansion plates 300 are distributed around the fixing plate 120 and contact the outer wall of the fixing plug 200 to form an installation space. The limiting axial member 400 is disposed on the fixing member 100 on the side where the large end of the fixing plug 200 is located. It can limit the axial position of the fixing plug 200, so that the fixing plug 200 pushes the expansion piece 300 to expand outward and contact the positioning hole 20 on the tube 10 for fixation.

[0041] Reference Figures 1-4 The fixing member 100 is a mechanism for fixing the measuring tool 40, such as a measuring frame. In some embodiments, the fixing rod 110 is a screw, and the fixing plate 120 is sleeved on the tail end of the screw and fixed with a fixing nut 130 to provide stable tension for the device. The fixing plate 120 has mounting holes and is a steel structure, which can be referred to as a steel base plate.

[0042] The expansion plates 300 are connected to the steel base plate and can move freely and rotate around the steel base plate. They can also be steel structures, i.e., steel sheets. Multiple expansion plates 300 are symmetrically arranged and evenly distributed around the fixed plate 120.

[0043] The fixing plug 200 has a hole in the middle, passes through the fixing rod 110 and is placed in the device. It moves towards the fixing plate 120, and then the limiting nut 410 is screwed into the fixing rod 110 to compress the fixing plug 200, causing the expansion plate 300 to expand outward as a whole and contact the positioning hole 20 on the tube plate 10 for fixation.

[0044] Furthermore, referring to Figures 1-4 The shape of the trapezoidal plug can be optimized. In some embodiments, the side of the trapezoidal plug is designed as an arc surface that matches the positioning hole 20. When the trapezoidal plug is compressed and expands, its arc surface can guide the free end of the steel sheet to fit more tightly against the cylindrical hole wall, thereby improving the fixation stability of the device.

[0045] In the aforementioned non-destructive fixing device 30 for the segment 10, the fixing plug 200 extends into the positioning hole 20 on the inner wall of the segment 10, pushing the fixing plug 200 towards the bottom end of the fixing rod 110, causing the expansion plate 300 to expand outward and contact the positioning hole 20 on the segment 10. The fixing plug 200 is fixed by the limiting axial member 400, ensuring that the expansion plate 300 remains in contact with the positioning hole 20 on the segment 10. The measuring tool 40 is connected to the non-destructive fixing device 30 for measurement operations. When removal is required, the limiting axial member 400 is loosened, and the non-destructive fixing mechanism is removed. During installation and disassembly, no damage is caused to the segment 10, achieving non-destructive installation and removal, effectively protecting the structural integrity of the segment 10, and extending the service life of the segment 10, making it particularly suitable for projects with high structural protection requirements. This non-destructive fixing device 30 can be repeatedly installed and used.

[0046] In some embodiments, refer to Figures 1-4 The number of expansion plates 300 is 3 to 5, and each expansion plate 300 is hinged to the fixing plate 120 at one end.

[0047] The number of expansion pads 300 is 3 to 5, for example, 4. In this way, each expansion pad 300 is small, and after expansion, it can fit more tightly with the positioning hole 20, resulting in a better fixing effect.

[0048] In some embodiments, refer to Figures 1-4 It also includes rubber pads 500 that are provided one-to-one with the expansion plates 300, and the rubber pads 500 are provided on the surface of the expansion plates 300 away from the fixing plugs 200.

[0049] The rubber pad 500 can be bonded to the expansion sheet 300 using adhesive. For example, apply a layer of specialized adhesive evenly to the outside of the expansion sheet 300. Choose an adhesive with high adhesion and durability to ensure a tight bond between the rubber pad 500 and the expansion sheet 300. Starting from one end of the expansion sheet 300, firmly adhere the rubber pad 500 to its surface, gradually unfolding it to avoid wrinkles or air bubbles, ensuring complete adhesion and forming a complete expansion layer. After the adhesive dries and cures, the rubber pad 500 and the expansion sheet 300 are tightly bonded, providing excellent sealing and cushioning performance.

[0050] During installation, the tightened expansion plate 300 expands under pressure and presses against the rubber pad 500. The rubber pad 500 then fits tightly against the wall of the pre-reserved positioning hole 20 of the precast component, thus achieving the purpose of expanding and fixing the fixing rod 110.

[0051] In some embodiments, a return spring is also included, which is sleeved on the fixing rod 110 and located between the fixing piece 120 and the fixing plug 200.

[0052] During installation, the retaining plug 200 moves toward the retaining plate 120, thereby compressing the return spring and securing it via the limiting axial member 400. During disassembly, removing or loosening the limiting axial member 400 causes the return spring to reset, pushing the retaining plug 200 outwards. This causes the expansion plate 300 to retract inwards and separate from the positioning hole 20. This method facilitates the non-destructive removal of the fixing device 30, improving construction efficiency.

[0053] In some embodiments, the diameter of the return spring is larger than that of the fixing nut 130 but smaller than that of the fixing plate 120. This design results in a larger effective area for the return spring and a more stable return effect.

[0054] In some embodiments, a circumferential elastic element is further included, which is disposed circumferentially around the at least two expansion plates 300 to constrain the expansion plates 300 and fix the fixing plug 200. When not installed in the positioning hole 20, the circumferential elastic element constrains the expansion plate 300 and fixes the fixing plug 200, thus the positions of the fixing plug 200 and the expansion plate 300 are relatively fixed, facilitating transportation and storage. When the expansion plate 300 expands, the circumferential elastic element expands accordingly without creating obstruction.

[0055] In some specific embodiments, the circumferential elastic element is a rubber ring. Each expansion piece 300 has a through hole in the middle along the width direction, and the rubber ring passes through each through hole, fitting around the circumference of the expansion piece 300 to form a constraint.

[0056] In some embodiments, refer to Figures 1-4 The limiting axial component 400 is a limiting nut 410, which is fixed to the fixing rod 110. This method provides good fixing effect and has a simple and stable structure.

[0057] In some embodiments, refer to Figures 1-4 It also includes a mounting nut 140 set on the fixed rod 110 for mounting the measuring tool 40.

[0058] The aforementioned non-destructive fixing device 30 for segment 10 has at least the following advantages:

[0059] Non-destructive characteristics: The entire installation and dismantling process does not require drilling or enlarging of prefabricated components. It relies entirely on the expansion principle of the device to achieve fixation, ensuring that the structural integrity of the prefabricated components is not damaged and extending their service life.

[0060] Ease of operation: During installation, simply insert the fixing rod 110 into the pre-drilled positioning hole 20, and then assemble the required steel base plate, expansion plate 300, rubber pad 500, fixing plug 200, and limit nut 410 into the pre-drilled hole and tighten them according to the design. For removal, simply loosen the limit nut 410, and the device can be easily removed. No complicated professional tools or tedious procedures are required, greatly improving work efficiency.

[0061] Fixed reliability: After being compressed, the fixed plug 200 evenly transmits the force to the expansion plate 300, so that the expansion plate 300 expands stably. The rubber pad 500 is tightly combined with the hole wall, generating strong friction and expansion force. Tests have shown that it can remain stable when subjected to a tensile force of 500 Newtons, effectively ensuring the stability of the measurement process and ensuring the accuracy of the measurement data.

[0062] Versatility: By adjusting parameters such as the shape and size of the expansion plate 300 and the thickness of the rubber pad 500, it can be adapted to the pre-reserved positioning holes 20 of various sizes and shapes of precast components. Whether it is the circular hole of the tunnel segment 10 or the square hole of the bridge precast beam, reliable fixation can be achieved, thus broadening the application range of the device.

[0063] Reference Figures 1-4 This application also provides an application of the above-mentioned non-destructive fixing device 30 for tunnel segment 10 in the construction of tunnel segment 10, including the following steps:

[0064] S100: Insert the non-destructive fixing device 30 into the positioning hole 20 on the inner wall of the tube segment 10, and push the fixing plug 200 toward the bottom end of the fixing rod 110, so that the expansion plate 300 expands outward and contacts the positioning hole 20 on the tube segment 10.

[0065] S200: The fixing plug 200 is fixed by the limiting axial member 400, so that the expansion plate 300 keeps in contact with the positioning hole 20 on the tube 10.

[0066] S300: Connect the measuring tool 40 to the non-destructive fixing device 30 to perform the measuring operation.

[0067] S400: After completing the measurement work, loosen the limiting axial component 400 and remove the non-destructive fixing mechanism. The specific installation process is described in detail below. Preliminary preparation: When manufacturing the prefabricated components, reserve positioning holes 20. The hole diameter should be slightly larger than the diameter of this device by 2-3 mm to ensure that the device can be smoothly inserted into the positioning hole 20 and allow sufficient expansion space. Before installation, thoroughly clean the positioning hole 20 of debris and dust, ensuring that the hole wall is flat and clean, free from oil stains, water stains, or other factors that may affect the fit between the device and the hole wall. Check whether the fixing rod 110, limiting nut 410, fixing plug 200, expansion plate 300, rubber pad 500, and other components are intact. If there are any problems such as deformation, wear, or thread damage, replace the components promptly.

[0068] Screw and rivet insertion: Align the device vertically with the pre-drilled positioning hole 20 on the precast component, and slowly and steadily insert it into the hole until the bottom of the fixing rod 110 contacts the bottom of the hole or reaches the predetermined insertion depth. Keep the fixing rod 110 straight during insertion to avoid tilting. If deviation occurs, adjust the device position or the insertion angle of the fixing rod 110 promptly to ensure accurate installation. Generally, the insertion depth of the fixing rod 110 is 10-15 cm, but the specific depth depends on the thickness of the precast component and measurement requirements.

[0069] Fixing plate 120 and its installation: Place the steel base plate on one side of the precast component, allowing the device to pass through the pre-drilled hole in the base plate, ensuring a tight fit between the base plate and the surface of the precast component. Next, connect one end of the cut expansion piece 300 to the fixing plate 120 using a hinge. The hinge installation must ensure that the expansion piece 300 can move freely and that the connection is secure and reliable. The free end of the expansion piece 300 hangs naturally, close to the inner wall of the positioning hole 20, leaving space for subsequent expansion. The length and width of the expansion piece 300 are designed according to the size of the positioning hole 20 of the precast component and measurement requirements, typically 10-15 cm in length and 3-5 cm in width.

[0070] Rubber Gasket 500 Installation: Apply a layer of specialized adhesive evenly to the outer side of the expansion sheet 300. Choose an adhesive with high adhesion and durability to ensure a tight bond between the rubber gasket 500 and the expansion sheet 300. Starting from one end of the expansion sheet 300, firmly adhere the rubber gasket 500 to its surface, gradually unfolding it to avoid wrinkles or air bubbles. Ensure complete adhesion between the rubber gasket 500 and the expansion sheet 300, forming a complete expansion layer. Allow the adhesive to dry and cure. The rubber gasket 500 and expansion sheet 300 will then be tightly bonded, providing excellent sealing and cushioning performance.

[0071] Trapezoidal plug assembly: Align the through hole of the fixing plug 200 with the fixing rod 110, and insert it from the other end of the fixing rod 110 until the fixing plug 200 is close to one end of the rubber pad 500. When installing the fixing plug 200, ensure its correct position so that it is evenly stressed during subsequent compression, pushing the expansion plate 300 to expand. The double-ended trapezoidal structure design of the fixing plug 200 enables it to stably transmit pressure when stressed, preventing uneven local stress from causing uneven expansion of the expansion plate 300.

[0072] Tightening and expansion fixing of the limit nut 410: Use a wrench of appropriate size on the nut and rotate the nut clockwise, causing the nut to move along the fixing rod 110 towards the fixing plug 200. As the nut tightens, the fixing plug 200 is compressed and deformed under pressure. This pressure is transmitted to the expansion plate 300, which expands outward along the circumference of the fixing rod 110 under pressure, forcing the rubber pad 500 into close contact with the inner wall of the positioning hole 20. Continue to tighten the nut evenly until the rubber pad 500 generates sufficient friction and expansion force on the inner wall of the positioning hole 20, thus firmly fixing the device to the precast component. The specific torque value is determined according to the material of the precast component, the hole diameter, and measurement requirements.

[0073] Post-installation inspection: After securing the device, gently shake it to check its stability. If any looseness is found, readjust the tightness of the nuts. Inspect the device for any damage or deformation, and ensure that all parts are securely connected to guarantee the safety of the measurement process. Once everything is in order, install the measuring frame.

[0074] Dismantling Process: After the measurement work is completed, use a wrench to rotate the nut counterclockwise to slowly release the pressure of the nut on the fixing plug 200. Observe the contraction of the device to avoid damage to the device or prefabricated components due to rapid rebound of the expansion plate 300 and rubber gasket 500 caused by sudden pressure release. After the nut is completely loosened, the fixing plug 200, expansion plate 300, and rubber gasket 500 will return to their original shape under elastic action, and the expansion force will disappear. Gently rotate and pull out the fixing rod 110 device, and remove the device from the reserved positioning hole 20. The action should be gentle and smooth to avoid abrading the positioning hole 20. After dismantling, clean the dust and dirt on the surface of the device, check whether the parts are intact, and replace damaged parts in time to ensure that the device can be reused.

[0075] The above technical solutions of the present invention are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A non-destructive fixing device suitable for tunnel segments, characterized in that, include: The fastener includes a fixing rod and a fixing piece sleeved and fixed to the bottom end of the fixing rod; A fixing plug is axially movably sleeved inside the fixing rod. The fixing plug is frustoconical in shape, with its small end close to the bottom end of the fixing rod. At least two expansion plates, each having one end rotatably connected to the fixed plate and the other end extending toward the top of the fixed rod, are distributed around the fixed plate and contact the outer wall of the fixed plug to form an installation space; An axial limiting component is provided on the fixing component on the side where the large end of the fixing plug is located. It can limit the axial position of the fixing plug, so that the fixing plug pushes the expansion piece to expand outward and contact the positioning hole on the tube to fix it.

2. The non-destructive fixing device for tunnel segments according to claim 1, characterized in that, The number of expansion plates is 3 to 5, and each expansion plate is hinged to the fixed plate at one end.

3. The non-destructive fixing device for tunnel segments according to claim 1, characterized in that, It also includes rubber pads that correspond one-to-one with the expansion plates, and the rubber pads are disposed on the surface of the expansion plates away from the fixing plugs.

4. The non-destructive fixing device for tunnel segments according to claim 1, characterized in that, It also includes a return spring, which is sleeved on the fixing rod and located between the fixing plate and the fixing plug.

5. The non-destructive fixing device for tunnel segments according to claim 4, characterized in that, The fixing rod is a screw rod, and the fixing plate is sleeved on the tail end of the screw rod and fixed with a fixing nut.

6. The non-destructive fixing device for tunnel segments according to claim 5, characterized in that, The diameter of the return spring is larger than that of the fixing nut but smaller than that of the fixing plate.

7. The non-destructive fixing device for tunnel segments according to any one of claims 1 to 6, characterized in that, It also includes a circumferential elastic element, which is disposed around the circumference of the at least two expansion plates to constrain the expansion plates and fix the fixing plug.

8. The non-destructive fixing device for tunnel segments according to claim 1, characterized in that, The limiting axial component is a limiting nut, which is fixed on the fixing rod.

9. The non-destructive fixing device for tunnel segments according to claim 1, characterized in that, It also includes mounting nuts set on the fixed rod for mounting measuring tools.

10. The application of any one of claims 1 to 9, a non-destructive fixing device suitable for tunnel segments, in tunnel segment construction, characterized in that, Includes the following steps: Insert the non-destructive fixing device into the positioning hole on the inner wall of the tube segment, and push the fixing plug toward the bottom end of the fixing rod, so that the expansion plate expands outward and contacts the positioning hole on the tube segment; The fixing plug is fixed by limiting the axial part, so that the expansion plate and the positioning hole on the tube are kept in contact; Connect the measuring tools to the non-destructive fixing device to perform the measuring operation; After completing the measurement work, loosen the limiting axial component and remove the non-destructive fixing mechanism.

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