An anchoring and lead-out structure and operation method for fiber optic self-monitoring FRP cables

Abstract

The present invention provides an anchoring and lead-out structure and an operation method for an optical fiber self-monitoring FRP cable, belonging to the field of intelligent structural health monitoring. It solves the problems of insufficient anchoring efficiency in the process of preparing the cable with the existing self-monitoring FRP rod, the obstruction of the optical fiber in the center of the rod and the leakage of the grouting material in the anchor during vibration. An anchoring and lead-out structure for an optical fiber self-monitoring FRP cable includes: an anchor cup, one end of which is sequentially connected with a split rod plate, a top plate and a pre-tightening plate from inside to outside along the axis, and a conical hole is arranged on the split rod plate; a self-monitoring FRP rod, each self-monitoring FRP rod is led out from the anchor cup, openings are symmetrically arranged on both sides of the leading end, the middle part between the two openings is internally provided with a preset optical fiber, and after double wedges are inserted into the two openings, they are inserted into the conical hole together; rubber rings and rubber plugs are arranged at the edges of the split rod plate and the lead for sealing, and grouting resin is used to plug the leak in the cavity formed by the anchor cup and the top plate. It is mainly used for the anchoring and lead-out of the cable.

Description

Technical Field

[0001] The present invention belongs to the field of intelligent structural health monitoring, and particularly relates to an anchoring and lead-out structure and an operation method for a fiber optic self-monitoring FRP cable. Background Art

[0002] The fiber reinforced polymer (FRP) cable is prepared by anchoring multiple FRP rods, and has excellent properties of light weight, high strength and corrosion resistance. It can effectively overcome the problems of heavy self-weight and poor durability of traditional steel cables, and significantly improve the ultimate strength of the cable and its service life in a corrosive environment. Common types of FRP rods include: carbon fiber reinforced polymer (CFRP) rods, glass fiber reinforced polymer (GFRP) rods, basalt fiber reinforced polymer (BFRP) rods, etc. However, FRP rods are extremely brittle and have poor shear and compressive resistance. Sudden fracture failure may occur during the service of FRP cables, and debonding or shear failure may also occur at the anchoring end of the cable. Therefore, long-term damage monitoring of FRP cables is required.

[0003] Fiber optic monitoring technology can monitor signals such as temperature, strain and vibration of the surrounding environment, and has the advantages of stable signals, long distance and small sensors. It has been widely used in the health monitoring of civil engineering structures. Common fiber optic monitoring technologies include fiber Bragg grating sensing technology (FBG), weak grating sensing technology (mFBG), Brillouin scattering sensing technology (BOTDA / R), Rayleigh scattering optical time domain reflectometry (OTDR) and Rayleigh scattering optical frequency domain reflectometry (OFDR). After preparing a self-monitoring FRP rod by pultrusion process with fiber optic sensors, fibers and resins, not only the fragile fiber optic sensors are protected by the FRP layer, improving the durability of the sensors, but also the self-monitoring FRP rod can be used as a load-bearing member. Through the self-monitoring FRP rod, the damage of the FRP itself and the environmental structure can be monitored, meeting the requirements of structural function integration.

[0004] The anchoring problem of FRP rods / cables is a key factor affecting whether the FRP material can fully exert its tensile performance. The commonly used existing anchoring method for FRP cables is to split the center of the tail end of each rod body and embed a wedge block, and then pour grouting material into the anchor cup to anchor the cable. This not only achieves a reliable anchoring efficiency, but also facilitates the hoisting of the anchor during the anchoring process through the wedge block. However, splitting and embedding the wedge block of the rod body will cut off the optical fiber in the center of the self-monitoring FRP rod, hindering the lead-out of the optical fiber from the anchor and its connection to the equipment. Therefore, a method that does not affect the lead-out of the optical fiber in the center of the self-monitoring FRP rod body needs to be designed, and at the same time, the anchoring effect is the same as that of the existing single wedge block scheme. In addition, after the optical fiber is led out from the fiber optic anchor, the problem of internal grouting material leakage at the lead-out position of the optical fiber must be solved to prevent the leakage of uncured grouting material during placement and vibration.

[0005] Therefore, there is an urgent need for a structure and its operating process that can simultaneously achieve high anchoring efficiency of the rod / cable, leadable end - fiber, and leak - proof anchor cup. Summary of the Invention

[0006] In view of this, the present invention aims to provide an anchoring and lead - out structure and an operating method for a fiber - self - monitored FRP cable, so as to solve the problems of insufficient anchoring efficiency and the inability to lead out the fiber in the center of the rod during the preparation of the cable for the existing self - monitored FRP rod.

[0007] To achieve the above object, the present invention adopts the following technical solutions. According to one aspect of the present invention, there is provided an anchoring and lead - out structure for a fiber - self - monitored FRP cable, including:

[0008] An anchor cup, at one end of which there are successively connected, from inside to outside along the axial direction, a sub - rod plate, a top plate, and a pre - tightening plate. A conical hole is provided on the sub - rod plate;

[0009] Multiple self - monitored FRP rods are provided. Each self - monitored FRP rod is led out from the inside of the anchor cup to form a lead - out end. Openings are symmetrically provided on both sides of the lead - out end. The middle part between the two openings has a preset optical fiber inside. After double wedges are inserted into the two openings, they are inserted together into the conical hole for rod body anchoring. Openings for the middle part to pass through are provided on both the top plate and the pre - tightening plate. A washer is provided between one end of each double wedge away from the anchor cup and the top plate. Each rubber plug is arranged corresponding to a self - monitored FRP rod, limited between the top plate and the pre - tightening plate, and one end is inserted into the opening of the top plate for sealing the edge of the middle part and the opening of the top plate. Each middle part passes through the rubber plug and then passes out from the pre - tightening plate;

[0010] A rubber ring is provided at the edge of the sub - rod plate for sealing, and grouting resin is used to plug the leak in the cavity formed by the anchor cup and the top plate.

[0011] Furthermore, the washer is sleeved on the middle part of the self - monitored FRP rod.

[0012] Furthermore, a part of the FRP rod patch is coupled to the outer wall of the middle part on the side of the washer away from the anchor cup. The FRP rod patch passes through the rubber plug and then passes out from the opening of the pre - tightening plate.

[0013] Furthermore, the rubber plug is in the shape of a stepped cylinder, and the larger - diameter end is clamped between the top plate and the pre - tightening plate.

[0014] Furthermore, a plurality of screws are provided on the end face of the anchor cup. After the pre - tightening plate passes through each screw, a nut is used to cooperate with the screw to drive the pre - tightening plate to move in the direction of pressing the rubber ring and the rubber plug.

[0015] Furthermore, a plurality of steps are provided inside the anchor cup, and the sub - rod plate and the top plate are clamped at the corresponding steps.

[0016] Further, the taper of the conical hole is less than 20°, and after double wedges are inserted into the two openings of the lead-out end, the taper is the same as that of the conical hole.

[0017] According to another aspect of the present invention, there is provided an operation method for an anchoring and lead-out structure of the above-mentioned optical fiber self-monitoring FRP cable, including the following steps:

[0018] S1. Split the rod body. Cut the tail end of the self-monitoring FRP rod from both sides to form a middle part and side rod bodies on both sides of the middle part. The two cuts on both sides are kept parallel and symmetrical, and part of the side rod bodies on both sides are cut off to obtain an FRP rod patch, so that the length of the middle part is greater than 100 mm, the thickness is greater than the diameter of the optical fiber, and the split length on both sides is equal to the length of the double wedge;

[0019] S2. Insert the wedges. Insert the double wedges into the cuts on both sides respectively, and ensure that the tail ends of the double wedges are flush with the tail ends of the side rod bodies on both sides;

[0020] S3. Insert the split rod plate. Press the wedge-shaped tail end of the self-monitoring FRP rod embedded with the double wedges into the conical hole of the split rod plate;

[0021] S4. Put on the washer. Put the washer on the middle part and press it tightly against the tail end of the double wedge;

[0022] S5. Paste the rod patch. Paste the FRP rod patch obtained by cutting in part S1 on both sides of the middle part behind the washer, so that the middle part is restored to a round-section rod;

[0023] S6. Put on the top plate. Put the rubber ring into the anchor cup, and put the top plate on the round-section rod so that the top plate is in close contact with the rubber ring and the washer;

[0024] S7. Put on the rubber plug. Plug the rubber plug into the opening gap between the round-section rod and the top plate, so that the rubber plug is in close contact with the round-section rod and the opening of the top plate;

[0025] S8. Put on the pre-tightening plate. Put the pre-tightening plate on the round-section rod and the screw rod, and tighten the nut so that the pre-tightening plate is in close contact with the anchor cup to achieve pre-tightening and sealing of the structure;

[0026] S9. Strip the optical fiber. Strip the optical fiber from the led-out round-section rod.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The present anchoring and lead wire structure realizes the effective anchoring function of the rod body: by embedding double wedges on both sides of the tail end of the FRP rod and inserting them into the through holes of the split rod plate, the anchoring effect at the tail end of the FRP rod is finally realized. At the same time, through the rod body pull-out test, it is verified that the tensile load curves of the double wedges and the single wedge on the rod body are consistent, that is, the anchoring effects of the double wedges and the single wedge on the rod body are the same;

[0029] 2. The present anchoring and lead wire structure realizes the optical fiber lead wire function: by embedding double wedges at both ends of the tail end of the FRP rod, the optical fiber in the center of the FRP rod is not affected by the single wedge, so that the optical fiber can be led out from the central FRP layer;

[0030] 3. The present anchoring and lead wire structure realizes the leak-proof function of the anchor: by arranging a rubber ring between the split rod plate and the top plate, inserting a rubber plug between the FRP rod and the through hole of the top plate, and applying the pre-pressure of the pre-tightening plate to the structure, the anti-leakage of the grouting material at the edge of the split rod plate and the edge of the FRP rod is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 is a cross-sectional view of an anchoring and lead wire structure for an optical fiber self-monitoring FRP cable according to the present invention;

[0033] Figure 2 is a three-dimensional structure schematic diagram of an anchoring and lead wire structure for an optical fiber self-monitoring FRP cable according to the present invention;

[0034] Figure 3 is a state diagram after the self-monitoring FRP rod of the present invention is connected to the double wedge;

[0035] Figure 4 is a three-dimensional structure schematic diagram of the anchor cup according to the present invention;

[0036] Figure 5 is a structure schematic diagram of the split rod plate according to the present invention;

[0037] Figure 6 is a structure schematic diagram of the top plate according to the present invention;

[0038] Figure 7 is a structure schematic diagram of the pre-tightening plate according to the present invention;

[0039] Figure 8 is a schematic diagram of the operation method steps of an anchoring and lead wire structure for an optical fiber self-monitoring FRP cable according to the present invention;

[0040] Figure 9 It is a comparison diagram of the load-displacement curves of a single wedge block and a double wedge block under the rod pulling-out test.

[0041] Anchor cup 1; optical fiber 2; self-monitoring FRP rod 3; double wedge block 4; rod separating plate 5; washer 6; rubber ring 7; FRP rod patch 8; top plate 9; rubber plug 10; pre-tightening plate 11; screw 12; nut 13. Specific implementation manner

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0043] It should be noted that the descriptions of the present invention regarding directions such as "left", "right", "left side", "right side", "upper part", "lower part", "top", "bottom", etc. are all defined based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the described structure must be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In the description of the present invention, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Specific implementation manner one:

[0046] Referring to the accompanying drawings to illustrate this implementation manner, according to one aspect of the present invention, an anchoring and lead-out structure for an optical fiber self-monitoring FRP cable is provided, including:

[0047] An anchor cup 1, one end of which is sequentially connected with a rod separating plate 5, a top plate 9, and a pre-tightening plate 11 from inside to outside along the axis, and a tapered hole is provided on the rod separating plate 5;

[0048] There are multiple self - monitoring FRP rods 3. Each self - monitoring FRP rod 3 extends out from the anchor cup 1 to form an extension end. Openings are symmetrically arranged on both sides of the extension end. Inside the middle part between the two openings is a preset optical fiber 2. After inserting double - wedge blocks 4 into the two openings, they are inserted together into the tapered hole for rod body anchoring. Openings for the middle part to pass through are provided on both the top plate 9 and the pre - tightening plate 11. A washer 6 is arranged between one end of each double - wedge block 4 away from the anchor cup 1 and the top plate 9. Each rubber plug 10 is arranged corresponding to the self - monitoring FRP rod 3, limited between the top plate 9 and the pre - tightening plate 11, and one end is inserted into the opening of the top plate 9 for sealing the edge of the middle part and the opening of the top plate 9. Each middle part passes through the rubber plug 10 and then passes out from the pre - tightening plate 11;

[0049] A rubber ring 7 is arranged at the edge of the split rod plate 5 for sealing, and grouting resin is used to plug leaks in the cavity formed by the anchor cup 1 and the top plate 9. By setting a notch and embedding the double - wedge block 4, the optical fiber 2 in the middle can still be protected in the middle part of the rod body, so that the function of leading the optical fiber 2 outwards from inside the anchor can be realized, overcoming the defect that the traditional anchoring method cannot lead the wire outwards, and providing the possibility for the realization of optical fiber monitoring. The wedge - shaped angle formed by the combination of the double - wedge block 4 and the tail end of the self - monitoring FRP rod 3 is the same as the taper of the tapered hole, that is, the angle of a single wedge block is half of the taper of the tapered hole, so that the tail - end wedge of the self - monitoring FRP rod 3 matches the tapered hole. When the tail end of the self - monitoring FRP rod 3 and the double - wedge block form a wedge shape and are pressed into the tapered hole, the tapered hole can provide sufficient mechanical biting force and friction force for the rod body to realize rod body anchoring. On the premise of ensuring stability, the optical fiber 2 is ensured to be led out completely, and at the same time, the full - length strain distribution of the anchorage area is monitored completely. As attached Figure 9 As described, through the pull - out test verification, the load - displacement curves of the rod body under the two anchoring methods of the tail - end double - wedge block 4 and the traditional single - wedge block are consistent, proving that the double - wedge block has the same good anchoring effect as the single - wedge block. It should be noted that the structure of the double - wedge block 4 is adopted in this application, and the method of using multiple wedge blocks as a replacement can also be used in this application.

[0050] In this embodiment, the washer 6 is sleeved on the middle part of the self - monitoring FRP rod 3. The inner diameter of the washer 6 is kept consistent with the diameter of the middle part. The outer diameter of the washer 6 needs to be larger than the maximum width of the tail - end wedge of the rod. At the same time, the thickness of the double - wedge block 4 needs to be less than the thickness of the split rod body on both sides, and the length of the double - wedge block 4 needs to be equal to the depth of the split crack, so that the double - wedge block 4 is tightly pressed into the tapered hole of the split rod plate 5 by the washer 6 and does not come off. The inner diameter of the opening of the top plate 9 needs to be smaller than the outer diameter of the washer 6; thus, the top plate 9 can drive the wedge block at the rod end to be pressed into the tapered hole.

[0051] In this embodiment, a part of the FRP rod patch 8 is coupled to the outer wall of the middle part on the side of the washer 6 away from the anchor cup 1. The FRP rod patch 8 passes through the rubber plug 10 and then passes out through the opening of the pre-tightening plate 11. The FRP rod patch 8 is specifically formed by cutting a part of the side rod body, so that there is no need to separately obtain additional materials for the FRP rod patch 8, improving convenience and reducing costs.

[0052] In this embodiment, the rubber ring 7 is mainly arranged at the edge of the split rod plate 5 to improve the sealing performance. The prerequisite for the sealing performance is that the top plate 5 and the pre-tightening plate 11 press the rubber ring 7 at the joint position.

[0053] In this embodiment, the rubber plug 10 is in the shape of a stepped cylinder, and the larger diameter end is clamped between the top plate 9 and the pre-tightening plate 11. Regarding the realization of the leak plugging function, the outer diameter of the rubber ring 7 needs to be the same as the outer diameter of the top plate 9, and the inner diameter is smaller than the outer diameter of the split rod plate 5; thus ensuring that the rubber ring 7 completely covers the pores at the edge of the split rod plate 5. After the tail end of the self-monitoring FRP rod 3 is split, an FRP rod patch 8 needs to be re-pasted at the inserted section of the rubber plug 10 so that the middle part is restored to a round-section rod. At the same time, the outer diameter of the exposed section of the rubber plug 10 needs to be slightly larger than the opening of the top plate 9, and the inner diameter of the rubber plug 10 needs to be slightly smaller than the outer diameter of the round-section rod, so as to ensure close contact when the rubber plug 10 is inserted into the pores between the opening of the top plate 9 and the round-section rod.

[0054] In this embodiment, a plurality of screw rods 12 are arranged on the end face of the anchor cup 1. After the pre-tightening plate 11 passes through each screw rod 12, the nut 13 is used in cooperation with the screw rod 12 to drive the pre-tightening plate 11 to move in the direction of pressing the rubber ring 7 and the rubber plug 10, further improving the leak prevention effect.

[0055] In this embodiment, a plurality of steps are arranged inside the anchor cup 1, and the split rod plate 5 and the top plate 9 are clamped at the corresponding steps. The inside of the anchor cup 1 is conical. After the double wedge blocks 4 of the tail end self-monitoring FRP rod 3 are anchored and the lead wires are completed, grouting material needs to be poured inside the anchor cup 1. After the grouting material is completely cured, the overall anchoring of the cable is realized. The tail end of the anchor cup 1 is provided with three layers of steps, namely inner, middle and outer, and the step diameters are the same as those of the split rod plate 5, the top plate 9, and the pre-tightening plate 11 in sequence, which are respectively used to realize the limiting and forward pre-tightening extrusion functions of the split rod plate 5, the top plate 9, and the pre-tightening plate 11. The number and layout positions of the self-monitoring FRP rods 3 are set according to the engineering requirements. For ordinary FRP rods without optical fibers in the cable, there is no need to set the openings of the top plate 9 and the pre-tightening plate 11 at the corresponding positions, and a single wedge block or double wedge block 4 anchoring method can be selected.

[0056] In this embodiment, the taper of the conical hole is less than 20°. After the double wedge blocks 4 are inserted into the two openings of the lead-out end, the taper is the same as that of the conical hole.

[0057] According to another aspect of the present invention, there is provided an operation method for an anchoring and lead-out structure of the above-mentioned fiber optic self-monitoring FRP cable, including the following steps:

[0058] S1. Split the rod body. Cut the tail end of the self-monitoring FRP rod 3 from both sides to form a middle part and side rod bodies on both sides of the middle part. The two side cuts are kept parallel and symmetrical, and part of the side rod bodies on both sides are cut off to obtain the FRP rod patch 8, so that the length of the middle part is greater than 100 mm and the thickness is greater than the diameter of the optical fiber 2. The splitting length on both sides is equal to the length of the double wedge block 4;

[0059] S2. Insert the wedge blocks. Insert the double wedge blocks 4 into the two side cuts respectively, and ensure that the tail ends of the double wedge blocks 4 are flush with the tail ends of the side rod bodies on both sides;

[0060] S3. Insert the separating plate. Press the wedge-shaped tail end of the self-monitoring FRP rod 3 with the double wedge blocks 4 inserted into the tapered hole of the separating plate 5;

[0061] S4. Slip on the washer. Slip the washer 6 onto the middle part and press it tightly against the tail end of the double wedge block 4;

[0062] S5. Paste the rod patch. Paste the FRP rod patch 8 obtained by cutting in part S1 on both sides of the middle part at the rear end of the washer 6, so that the middle part is restored to a round-section rod;

[0063] S6. Slip on the top plate. Place the rubber ring 7 into the anchor cup 1, and slip the top plate 9 onto the round-section rod so that the top plate 9 is in close contact with the rubber ring 7 and the washer 6;

[0064] S7. Slip on the rubber plug. Insert the rubber plug 10 into the opening gap between the round-section rod and the top plate 9, so that the rubber plug 10 is in close contact with the round-section rod and the opening of the top plate 9;

[0065] S8. Slip on the pre-tightening plate. Slip the pre-tightening plate 11 onto the round-section rod and the screw 12, and tighten the nut 13 so that the pre-tightening plate 11 is in close contact with the anchor cup 1 to achieve pre-tightening and sealing of the structure;

[0066] S9. Strip the optical fiber. Strip the optical fiber 2 from the led-out round-section rod. Specific Embodiment 2:

[0068] Now it is necessary to prepare a cable of a 5-mm fiber optic self-monitoring CFRP rod, and it is necessary to perform double-wedge block anchoring at the tail end of the self-monitoring CFRP rod body and fiber optic lead-out. The diameter of the optical fiber is 1 mm. The specific operation steps are as follows:

[0069] S1. Split the rod body. Cut the self-monitoring CFRP rod 3 from both sides at the tail end to form an intermediate part and side rod bodies on both sides of the intermediate part. The two side cuts are kept parallel and symmetric, and part of the side rod bodies on both sides are cut off to obtain the FRP rod patch 8, so that the length of the intermediate part is greater than 100 mm, the thickness is 2 mm, and the split lengths on both sides and the length of the double wedge block 4 are both 40 mm.

[0070] S2. Embed the wedge blocks. Embed the double wedge blocks 4 into the two side cuts respectively, and ensure that the tail ends of the double wedge blocks 4 with a taper of 20° are flush with the tail ends of the CFRP rods on both sides. The length of a single wedge block is 40 mm, the width is 4.5 mm, and the angle is 10°.

[0071] S3. Insert the split rod plate. Press the wedge-shaped tail end of the self-monitoring CFRP rod 3 embedded with the double wedge block 4 into the tapered hole of the split rod plate 5, and the taper of the tapered hole is 20°.

[0072] S4. Slip on the washer. Slip the washer 6 onto the intermediate part and press it tightly against the tail end of the double wedge block 4. The inner diameter of the washer 6 is 5 mm and the outer diameter is 20 mm.

[0073] S5. Paste the rod patch. Paste the CFRP rod patch 8 obtained by cutting in part S1 on both sides of the intermediate part at the rear end of the washer 6, so that the intermediate part is restored to a round-section rod.

[0074] S6. Slip on the top plate. Place the rubber ring 7 into the anchor cup 1, and slip the top plate 9 onto the round-section rod so that the top plate 9 is in tight contact with the rubber ring 7 and the washer 6. The diameter of the through hole of the top plate 9 is 9 mm.

[0075] S7. Slip on the rubber plug. Insert the rubber plug 10 into the opening gap between the round-section rod and the top plate 9, so that the rubber plug 10 is in tight contact with the round-section rod and the opening of the top plate 9. The outer diameter of the rubber plug 10 is 9.5 mm and the inner diameter is 4.5 mm.

[0076] S8. Slip on the pre-tightening plate. Slip the pre-tightening plate 11 onto the round-section rod and the screw rod 12, and tighten the nut 13 so that the pre-tightening plate 11 is in tight contact with the anchor cup 1 to achieve pre-tightening and sealing of the structure.

[0077] S9. Strip the optical fiber. Strip the optical fiber 2 from the led-out round-section rod. The length of the optical fiber 2 is 100 mm. Specific Embodiment Three:

[0079] Now it is necessary to prepare a cable with a 10-mm optical fiber self-monitoring GFRP tendon. It is necessary to carry out tail-end double-wedge anchoring and optical fiber lead-out for the self-monitoring GFRP tendon body. The diameter of the optical fiber is 2 mm. The specific operation steps are as follows:

[0080] S1. Split the rod body. Cut the tail end of the self-monitoring GFRP bar 3 from both sides to form a middle part and side rod bodies on both sides of the middle part. The two side cuts are kept parallel and symmetrical, and part of the side rod bodies on both sides are cut off to obtain the GFRP bar patch 8, such that the length of the middle part is greater than 200 mm, the thickness is 4 mm, and the split lengths on both sides and the length of the double wedge block 4 are both 60 mm.

[0081] S2. Insert the wedge blocks. Insert the double wedge blocks 4 into the two side cuts respectively, and ensure that the tail ends of the wedge blocks with a taper of 15° are flush with the tail ends of the GFRP bars on both sides. The length of a single wedge block is 60 mm, the width is 9 mm, and the angle is 7.5°.

[0082] S3. Insert the split rod plate. Press the wedge-shaped tail end of the self-monitoring GFRP bar 3 with the double wedge blocks 4 inserted into the tapered hole of the split rod plate 5, and the taper of the tapered hole is 15°.

[0083] S4. Slip on the washer. Slip the washer 6 onto the middle part and press it tightly against the tail end of the double wedge block 4. The inner diameter of the washer 6 is 10 mm and the outer diameter is 40 mm.

[0084] S5. Paste the bar patch. Paste the GFRP bar patches 8 obtained by cutting in part S1 on both sides of the middle part at the rear end of the washer 6, so that the middle part is restored to a round-section rod.

[0085] S6. Slip on the top plate. Place the rubber ring 7 into the anchor cup 1, and slip the top plate 9 onto the round-section bar so that the top plate 9 is in tight contact with the rubber ring 7 and the washer 6. The opening diameter of the top plate 10 is 15 mm.

[0086] S7. Slip on the rubber plug. Insert the rubber plug 10 into the gap between the round-section bar and the opening of the top plate 9, so that the rubber plug 10 is in tight contact with the inner wall of the round-section bar and the opening of the top plate 9. The outer diameter of the rubber plug 10 is 16 mm and the inner diameter is 9 mm.

[0087] S8. Slip on the pre-tightening plate. Slip the pre-tightening plate 11 onto the round-section bar and the screw rod 12, and tighten the nut 13 so that the pre-tightening plate 11 is in tight contact with the anchor cup 1 to achieve pre-tightening and sealing of the structure.

[0088] S9. Strip the optical fiber. Strip the optical fiber 2 from the led-out round-section bar, and the length of the optical fiber is 200 mm.

[0089] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and variations can be made. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can well understand and utilize the present invention.

Claims

1. An anchoring and lead structure for optical fiber self-monitoring FRP cable, characterized in that: include: An anchor cup (1), one end of which is connected to a rod dividing plate (5), a top plate (9) and a pre-tightening plate (11) in sequence from the inside to the outside along the axial direction, and a tapered hole is provided on the rod dividing plate (5); A plurality of self-monitoring FRP rods (3) are provided, each of the self-monitoring FRP rods (3) is led out from the anchor cup (1) to form a lead-out end, openings are symmetrically arranged on both sides of the lead-out end, a preset optical fiber (2) is inside the middle part between the two openings, double wedge blocks (4) are inserted into the two openings and then inserted together into the conical hole for anchoring the rod body, the top plate (9) and the pre-tightening plate (11) are both provided with an opening for the middle part to pass through, a gasket (6) is provided between one end of each double wedge block (4) away from the anchor cup (1) and the top plate (9), each rubber plug (10) is arranged in one-to-one correspondence with the self-monitoring FRP rod (3), is limited between the top plate (9) and the pre-tightening plate (11), and one end is inserted into the opening of the top plate (9) for sealing the edge of the middle part and the opening of the top plate (9), and each of the middle parts passes through the rubber plug (10) and then passes out of the pre-tightening plate (11); The rubber ring (7) is arranged at the edge of the branch plate (5) for sealing, and is used to perform grouting resin sealing on the cavity formed by the anchor cup (1) and the top plate (9).

2. The anchoring and lead-in structure for optical fiber self-monitoring FRP cable according to claim 1, characterized in that: The washer (6) is sleeved on the middle portion of the self-monitoring FRP rod (3).

3. The anchoring and lead-in structure for optical fiber self-monitoring FRP cable according to claim 2, characterized in that: The outer wall of the middle portion located on the side of the gasket (6) away from the anchor cup (1) is coupled with a portion of the FRP rod patch (8), and the FRP rod patch (8) passes through the rubber stopper (10) and then passes out from the opening of the preload plate (11).

4. The anchoring and lead-in structure for optical fiber self-monitoring FRP cable according to claim 1, characterized in that: The rubber plug (10) is in the shape of a stepped cylinder, with an end with a larger diameter being clamped between the top plate (9) and the preload plate (11).

5. The anchoring and lead-in structure for optical fiber self-monitoring FRP cable according to claim 1, characterized in that: A plurality of screw rods (12) are arranged on the end surface of the anchor cup (1), and the pre-tightening plate (11) passes through each of the screw rods (12) and cooperates with the screw rods (12) through a nut (13) to drive the pre-tightening plate (11) to move in the direction of the compression rubber ring (7) and the rubber plug (10).

6. The anchoring and lead structure for optical fiber self-monitoring FRP cable according to claim 1, characterized in that: A plurality of steps are arranged in the anchor cup (1), and the branching plate (5) and the top plate (9) are engaged at corresponding steps.

7. The anchoring and lead-in structure for optical fiber self-monitoring FRP cable according to claim 1, characterized in that: The tapered hole has a taper of less than 20°, and after double wedge blocks (4) are inserted into the two openings of the lead-out end, the taper is the same as that of the tapered hole.

8. An operating method for the anchoring and lead-in structure for optical fiber self-monitoring FRP cable according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, splitting the rod body, cutting the tail end of the self-monitoring FRP rod (3) from both sides to form a middle part and side rod bodies located on both sides of the middle part, the cuts on both sides are kept parallel and symmetrical, and the side rod bodies on both sides are partially cut off to obtain an FRP rod patch (8), so that the length of the middle part is greater than 100 mm, the thickness is greater than the diameter of the optical fiber (2), and the split length on both sides is equal to the length of the double wedge block (4); S2, wedge block embedding, embed the double wedge blocks (4) into the cutouts on both sides respectively, and ensure that the rear ends of the double wedge blocks (4) are flush with the rear ends of the side rod bodies on both sides; S3, inserting the rod dividing plate, pressing the wedge-shaped tail end of the self-monitoring FRP rod (3) embedded with the double wedge block (4) into the tapered hole of the rod dividing plate (5); S4, insert the washer, insert the washer (6) into the middle part and make it fit tightly with the tail end of the double wedge (4); S5, rod body patch, the FRP rod patch (8) cut out from the portion S1 is pasted on both sides of the middle part of the rear end of the washer (6), so that the middle part is restored to a round cross-section rod; S6, insert the top plate, put the rubber ring (7) into the anchor cup (1), and insert the top plate (9) into the circular cross-section rod so that the top plate (9) is tightly attached to the rubber ring (7) and the gasket (6); S7, inserting the rubber plug, inserting the rubber plug (10) into the opening of the circular cross-section rod and the top plate (9), so that the rubber plug (10) is in close contact with the opening of the circular cross-section rod and the top plate (9); S8, inserting the preload plate, inserting the preload plate (11) into the circular cross-section rod and the screw (12), and tightening the nut (13) so that the preload plate (11) is closely attached to the anchor cup (1), thereby achieving preload and sealing of the structure; S9, optical fiber stripping, stripping the optical fiber (2) from the lead-out circular cross-section rod.

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