An anchoring system and an anchoring method for a parallel plate cable of a thermoplastic resin matrix composite material

Abstract

The present invention discloses an anchoring system and an anchoring method for parallel plate cables of thermoplastic resin matrix composites, belonging to the technical field of anchoring of fiber-reinforced resin composites. The present invention solves the anchoring problems of FRP parallel plate cables used in existing long-span bridges and offshore platform structures, and the single clamping type or bonding type anchor cannot meet the anchoring requirements of FRP plates for civil engineering. By using the principle of heating, melting and cooling forming of thermoplastic resin matrix composites, the present invention adopts a pre-extrusion forming device to make each composite material plate in the anchoring area into a corrugated plate with flat ends at both ends, and through the spatial position arrangement of the plates, combined with high-modulus adhesives and the bending and extrusion effect of the plates, designs a parallel plate cable and its anchoring system for long-span bridges and offshore platform structures.

Description

Technical Field

[0001] The present invention relates to an anchoring system and an anchoring method for a parallel plate cable of a thermoplastic resin matrix composite material, belonging to the technical field of fiber reinforced resin composite material anchoring. Background Art

[0002] Fiber Reinforced polymer plate (FRP plate) has the advantages of light weight, high strength, corrosion resistance, fatigue resistance and good creep resistance compared with steel bars. The cable prepared therefrom can replace the steel cable and be used in prestressed concrete and bridge cable anchor structures. At the same time, compared with the composite cable with a circular cross section, the square cross section has a larger perimeter and a larger anchoring area per unit length, and it is easier to achieve effective anchoring. Therefore, developing an anchoring system for fiber composite parallel plate cables and curved panel anchors is of great significance for promoting the application of engineering structures.

[0003] At present, the main type of FRP resin is thermosetting epoxy resin, whose molecular structure is three-dimensional. It crosslinks and cures through chemical reactions, and sometimes some by-products are generated. This reaction is irreversible. Once cured, it will not soften or flow again even under pressure and heating. When the temperature is too high, decomposition or carbonization will occur. And because the molecules form a three-dimensional network structure through crosslinking, it has high brittleness, poor toughness and poor fatigue resistance. At the same time, the thermosetting resin contains a large amount of hydroxyl groups, which makes it easy to react with water to form hydrogen bonds, resulting in poor durability. Compared with thermosetting resins, thermoplastic composites have the advantages of good toughness, large damage tolerance, low moisture absorption rate, no storage time and temperature limitations, short molding cycle, simple molding process, etc. They can also be recycled and reused, have high plasticity, are environmentally friendly and have high economic benefits. Therefore, from the analysis of both structure and economic benefits, using thermoplastic resins to replace thermosetting resins to prepare FRP for civil engineering structures has greater development potential.

[0004] FRP plates are anisotropic, having high tensile strength along the fiber direction, but low shear and extrusion resistance perpendicular to the fiber direction, which makes its anchoring system a technical problem for the wide application of FRP plates. Currently, according to the characteristics of the anchoring force distribution, the existing anchorages can be divided into clamping-type and bonding-type anchorages. The anchoring force of the clamping-type anchorage is provided by the clamping force and friction generated inside the system. However, due to the huge local clamping force, it is easy to cause damage such as breaking of the FRP plate, accelerating the propagation of internal cracks and leading to anchoring failure; the anchoring force of the bonding-type anchorage is provided by the bonding force between the bonding medium (such as resin and cement-based) and the sleeve and the FRP plate. However, due to the inconsistent deformation of the bonding agent and the FRP plate when under tension, it is easy to cause slippage between the plate and the adhesive, reducing the anchoring efficiency. At the same time, the above-mentioned anchorages are for the anchoring of thermosetting composites and are not suitable for thermoplastic FRP plates because thermoplastic resins have higher toughness and larger deformation when heated compared with thermosetting resins. The huge extrusion friction during tension of the above-mentioned anchorages will generate a large amount of heat at the uneven local stress, resulting in the deformation of the thermoplastic matrix and causing anchoring failure. In addition, the above-mentioned anchorage system does not fully consider the structural optimization characteristics such as the spatial position arrangement of multiple fiber composites, and there are problems such as long anchoring length, inapplicability to large-tonnage cable systems, and poor economic efficiency, and it cannot be widely applied in civil engineering fields such as long-span bridges and offshore platforms. Summary of the Invention

[0005] The present invention aims to solve the anchoring problem of FRP parallel plate cables used in the structures of existing long-span bridges and offshore platforms, and the fact that neither the single clamping-type nor bonding-type anchorage can meet the anchoring requirements of FRP plates for civil engineering, and provides an anchoring system and an anchoring method for thermoplastic resin-based composite parallel plate cables.

[0006] One of the objectives of the present invention is to provide an anchoring system for parallel plate cables of thermoplastic resin matrix composites. The system includes an anchoring device for anchoring the parallel plate 3, a centering plate 5, an adhesive filler 2, and bolts. The anchoring device includes two anchoring plates 1 with the same structure and arranged vertically opposite to each other. The anchoring plate 1 is provided with three rows of parallel U-shaped grooves 1-1. The bottom of the U-shaped groove 1-1 includes several wedge-shaped bottoms 1-3 with different heights and several equal large circular wedge-shaped through holes 1-2. After the two anchoring plates 1 are butted, one end is an open end and the other end is a closed end. Along the thickness direction of the anchoring plate 1 at the grooved position of the closed end, several dovetail clip-shaped wire dividing grooves 6 are arranged in parallel. The parallel plate 3 is a corrugated plate with flat ends at both ends. Both ends of the parallel plate 3 are corrugated plates, and the tail section of the corrugated plate is a flat section. The flat section is inserted into the wire dividing groove 6, and the other end of the corrugated plate passes through the wire dividing hole 5-1 of the centering plate 5 and exits from the open end. The centering plate 5 is embedded in the open end. Along the length direction at the non-grooved position of the anchoring plate 1, several connecting holes 1-4 are provided. The two butted anchoring plates 1 are connected by bolts passing through the connecting holes 1-4, and the adhesive filler 2 is filled into the cavity enclosed by the two butted anchoring plates 1 through the circular wedge-shaped through holes 1-2.

[0007] Further defined, the parallel plate 3 is a thermoplastic resin matrix composite plate.

[0008] Further defined, the corrugated plate of the parallel plate 3 has a circular tooth surface, and the two-dimensional waveform line of the projection of the circular tooth surface conforms to the sine curve function. When the plate width is b, the amplitude is (0.1-0.4)b, the wavelength is (0.2-0.8)bπ, and the length of the flat section is 20-50 mm.

[0009] Further defined, the lateral distance between adjacent parallel plates 3 is (0.5-8)b, and the longitudinal spacing is (0.3-0.5)b.

[0010] Further defined, the centering plate 5 and the anchoring plate 1 are installed by bolts. The centering plate 5 is provided with several wire dividing holes 5-1, and the number of wire dividing holes 5-1 is the same as that of the wire dividing grooves 6, which serves to fix and anchor the parallel plate 3 and make the plates parallel to each other. And a sealing rubber ring 7 is provided between the wire dividing hole 5-1 and the parallel plate 3.

[0011] Further defined, the number of wire dividing holes 5-1 is 18, and they are distributed in 3 rows and 6 columns.

[0012] Further defined, the wire dividing groove 6 and the anchoring plate 1 are of an integral structure or are joined together by mortise and tenon.

[0013] Further defined, the adhesive filler 2 is composed of epoxy resin and iron sand.

[0014] Another objective of the present invention is to provide an anchoring method for parallel plate cables. This method applies the above anchoring system, and the specific operation steps are as follows:

[0015] S1. Use a pre - extrusion forming device to form a thermoplastic resin - based composite material plate into a parallel plate 3.

[0016] S2. Install the parallel plate 3 in the anchoring system to ensure that the parallel plates 3 are parallel to each other. Use an adhesive filler 2 to fill the gaps between the adhesive filler 2, the wire - splitting holes 5 - 1, and the wire - splitting grooves 6. Tighten the bolts, and stuff sealing rubber rings 7 between the two anchoring plates 1.

[0017] S3. Use a pressure injector to inject the adhesive filler 2 along the circular wedge - shaped through - holes 1 - 2 at different positions until it is filled and overflows. After the injection is completed, use a sealing block 8 to block the circular wedge - shaped through - holes 1 - 2.

[0018] Further defined, the injection sequence of the circular wedge - shaped through - holes 1 - 2 is to inject the side holes first and then the middle holes, and it is injected in a staged manner. After each stage of injection is completed, stop for 3 - 6 minutes before the next injection.

[0019] The third object of the present invention is to provide a pre - extrusion forming device for the above - mentioned parallel plate 3. The device includes a forming upper steel plate 9 and a forming lower steel plate 11. The forming upper steel plate 9 and the forming lower steel plate 11 are arranged opposite to each other up and down. Both include a flat plate section 12 and a corrugated tooth surface section 10. When the forming upper steel plate 9 and the forming lower steel plate 11 are buckled, the two upper and lower flat plate sections 12 form the flat plate section of the formed parallel plate 3, and the two upper and lower corrugated tooth surface sections 10 form the corrugated section of the formed parallel plate 3.

[0020] The present invention utilizes the principle of heating, melting, and cooling forming of thermoplastic resin - based composite materials. A pre - extrusion forming device is used to form each composite material plate in the anchoring area into a corrugated plate with flat ends at both ends. Through the spatial arrangement of the plates, combined with the high - modulus adhesive and the plate bending and extrusion effect, a parallel plate cable and its anchoring system for large - span bridges and offshore platforms are designed. Compared with the prior art, the present application also has the following beneficial effects:

[0021] (1) The present invention provides a method of utilizing the principle of heating, melting, cooling, forming and pre-applying a fixed load on a thermoplastic resin. The two ends of the parallel plates to be bent are placed in a forming device and corresponding loads are applied as needed. The whole is placed in a high-temperature furnace. The heating temperature and heating time should be determined according to the melting temperature of the thermoplastic resin. The dual effects of heating, melting and vertical load bending are utilized to prepare a composite material plate with stable dimensions, fixed shape and the same bending lines at both ends. This not only increases the contact area with the adhesive material and reduces the influence of the initial defects of the contact interface on the anchoring performance, but also enables a mechanical bite force to be generated between the cable body and the adhesive material, thereby avoiding the problems of stress concentration inside the anchor of the traditional anchoring system, easy debonding of the plate and adhesive inside the anchor, poor fatigue resistance and low anchoring efficiency. At the same time, the advantages of the thermoplastic resin matrix, such as good mechanical toughness, mechanical strength, wear and fatigue resistance, moisture and heat resistance, corrosion resistance and recyclability, are effectively utilized, and the adhesive characteristics with high modulus and expansion performance are combined.

[0022] (2) In the anchoring system provided by the present invention, the U-shaped groove steel plate is arranged in three rows, and each row has three equal-sized circular wedge-shaped inner holes, which can accommodate a large amount of mixed filling adhesive to increase the interfacial bonding strength between each layer of the parallel plate cable and the adhesive liquid. The bent wedges at both ends of each layer of the plate are fully utilized to increase the contact area with the adhesive liquid, the high modulus adhesive liquid's anti-external shear bonding strength, and the squeezing force of the U-shaped groove steel plate on the parallel plate cable during stretching, thereby forming a composite anchoring system and improving the anchoring efficiency.

[0023] (3) In the anchoring system provided by the present invention, an integrated centering plate is used at the loading end, and the centering plate is connected to the upper and lower anchoring plates by bolts, which plays the role of fixing each layer of the plate and making the plates parallel to each other. The free end adopts a dovetail clamp-shaped wire dividing groove, which can perform primary plate end anchoring on the parallel plate as a whole.

[0024] (4) The anchoring system provided by the present invention has a simple structure and is easy to use. It can be widely used in the anchoring technology of composite materials plates of different sizes. It solves the problem that the clips of the traditional clamping anchors cause large local shear deformation on the thermoplastic resin-based composite material cable, which is more prone to local shear fracture, and the traditional bonding anchors are prone to slippage failure due to the large deformation of the thermoplastic resin-based composite material rod or cable. It effectively utilizes the advantages of thermoplastic resin-based composite materials cables, such as good ductility, high toughness, bending resistance, wear resistance, fatigue resistance, moisture and heat corrosion resistance, recyclability, and green environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic cross-sectional view of an anchoring system for a thermoplastic resin-based composite parallel plate cable provided by the present invention;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of an anchoring plate of an anchoring system for a thermoplastic resin-based composite parallel plate cable provided by the present invention;

[0027] Figure 3 Schematic cross-sectional structure diagram of the anchor plate for the anchoring system of the parallel plate cable made of thermoplastic resin-based composite material provided by the present invention;

[0028] Figure 4 Schematic three-dimensional structure diagram of the centering plate for the anchoring system of the parallel plate cable made of thermoplastic resin-based composite material provided by the present invention;

[0029] Figure 5 Schematic structure diagram of inserting a parallel plate into the wire splitting hole of the anchoring system of the parallel plate cable made of thermoplastic resin-based composite material provided by the present invention and filling with adhesive filler;

[0030] Figure 6 Schematic structure diagram of inserting a parallel plate into the wire splitting groove of the anchoring system of the parallel plate cable made of thermoplastic resin-based composite material provided by the present invention;

[0031] Figure 7 Schematic diagram of the pre-extrusion forming device for the parallel plate cable made of thermoplastic resin-based composite material provided by the present invention;

[0032] Figure 8 Schematic structure diagram of the parallel plate cable;

[0033] In the figure, 1 - anchor plate, 1 - 1 - U-shaped groove, 1 - 2 - circular wedge-shaped through hole, 1 - 3 - wedge-shaped groove bottom, 1 - 4 - connection hole, 2 - adhesive filler, 3 - parallel plate, 4 - bolt, 5 - centering plate, 5 - 1 - wire splitting hole, 6 - wire splitting groove, 7 - sealing rubber ring, 8 - sealing block, 9 - upper forming steel plate, 10 - corrugated tooth surface section, 11 - lower forming steel plate, 12 - flat plate section. Detailed implementation manners

[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The experimental methods used in the following embodiments are all conventional methods unless otherwise specified. The materials, reagents, methods and instruments used, unless otherwise specified, are all conventional materials, reagents, methods and instruments in the art, and those skilled in the art can obtain them through commercial channels. Detailed implementation manner one:

[0037] The structure of the anchoring system for the parallel plate cable made of thermoplastic resin-based composite material in this embodiment is as Figure 1-3As shown in the figure, the anchoring system includes an anchoring device for anchoring the parallel plate 3, a centering plate 5, an adhesive filler 2, and bolts 4. The anchoring device includes two anchoring plates 1 with the same structure and arranged vertically opposite to each other. The anchoring plate 1 is provided with three rows of parallel U-shaped grooves 1-1. The bottom of the U-shaped groove 1-1 includes several wedge-shaped bottoms 1-3 with different heights, and several equal large circular wedge-shaped through holes 1-2 are provided. After the two anchoring plates 1 are butted, one end is an open end and the other end is a closed end. Along the thickness direction of the anchoring plate 1 at the slotted position of the closed end, several dovetail clip-shaped wire dividing grooves 6 are arranged in parallel. The parallel plate 3 is a corrugated plate with flat ends at both ends. Both ends of the parallel plate 3 are corrugated plates, and the tail section of the corrugated plate is a flat section. The flat section is inserted into the wire dividing groove 6, and the other end of the corrugated plate passes through the wire dividing hole 5-1 of the centering plate 5 and exits from the open end. The centering plate 5 is embedded in the open end. Along the length direction at the unslotted position of the anchoring plate 1, several connecting holes 1-4 are provided. The two butted anchoring plates 1 are connected by bolts 4 passing through the connecting holes 1-4, and the adhesive filler 2 is filled into the cavity enclosed by the two butted anchoring plates 1 through the circular wedge-shaped through holes 1-2. The parallel plate 3 is a thermoplastic resin-based composite material plate.

[0038] The corrugated plate of the parallel plate 3 has a circular tooth surface, and the two-dimensional waveform line of the projection of the circular tooth surface conforms to the sine curve function. When the plate width is b, the amplitude is (0.1-0.4)b, the wavelength is (0.2-0.8)bπ, and the length of the flat section is 20-50mm. With such a setting, the initial fiber breakage or fracture of the corrugated parallel plate 1 in the anchoring area is avoided, and the two-dimensional waveform line conforms to the sine curve function waveform circular tooth surface. And a 20-50mm flat section is left at the tail section of the parallel plate 3 to facilitate the insertion of the parallel plate 3 into the wire dividing groove 6, and at the same time, the stress concentration phenomenon caused by the deformation mutation during the forming of the end of the parallel plate 3 is avoided.

[0039] The transverse distance between adjacent parallel plates 3 is (0.5-8)b, and the longitudinal spacing is (0.3-0.5)b. The centering plate 5 and the anchoring plate 1 are installed by bolts. The centering plate 5 is provided with several wire dividing holes 5-1, and the number of wire dividing holes 5-1 is the same as that of the wire dividing grooves 6, which plays a role in fixing the anchored parallel plates 3 and making the plates parallel to each other. And a sealing rubber ring 7 is provided between the wire dividing hole 5-1 and the parallel plate 3. With such a setting, as Figure 5 shown in the figure, the centering plate 5 is of an integrated design, and 18 equal large plate sleeve-shaped hollow structures are evenly dug inside according to the spatial distribution as the wire dividing holes 5-1. The centering plate 5 and the upper and lower two anchoring plates 1 are connected by bolts 4, which plays a role in fixing each layer of plates and making the plates parallel to each other. After each layer of parallel plate 3 passes through the centering ring and is inserted, the gaps between the parallel plate 3 and the centering plate 5 and between the upper and lower two anchoring plates 1 need to be filled with the sealing rubber ring 7 to prevent glue leakage during glue filling.

[0040] The wire dividing groove 6 and the anchoring plate 1 are of an integral structure or are integrated by mortise and tenon. With such a setting, as Figure 6As shown, the end of the parallel plate 3 passing through the wire dividing hole 5-1 is tightly inserted into the wire dividing groove 6 with a "clip" shape and "sealed" at both left and right ends. Then, each wire dividing plate is clamped in the rear cable groove of the U-shaped groove steel plate to make the plates parallel to each other. The "clip" - shaped wire dividing groove 6 and the closed end of the anchoring plate 1 are mortised into one body. Glue filler 2 is preferably poured in to ensure good interfacial bonding between the wire dividing groove 6 and the parallel plate 3, and primary end anchoring of the whole parallel plate 3 can be carried out.

[0041] The pre-extrusion forming device of the above-mentioned parallel plate 3, such as Figure 7 shown, this device includes a forming upper steel plate 9 and a forming lower steel plate 11. The forming upper steel plate 9 and the forming lower steel plate 11 are arranged facing each other up and down. Both include a flat plate section 12 and a corrugated tooth surface section 10. When the forming upper steel plate 9 and the forming lower steel plate 11 are buckled, the two upper and lower flat plate sections 12 form the flat plate section of the formed parallel plate 3, and the two upper and lower corrugated tooth surface sections 10 form the corrugated section of the formed parallel plate 3, as Figure 8 shown.

[0042] The method for anchoring parallel plate cables using the above device includes the following steps:

[0043] First, soak the forming upper steel plate 9, the forming lower steel plate 11, the anchoring plate 1, the bolt 4, the centering plate 5, the sealing rubber ring 7, the sealing block 8 and the parallel plate to be formed in an acetone solution for ultrasonic treatment and wipe the surface impurities. After cleaning, spray a release agent on the surface of the anchoring plate 1. This is because when there is a slight misalignment between the glue filler 2 and the anchoring plate 1, the glue filler 2 and the plate can be regarded as a whole to improve their interfacial bonding force. At the same time, the high modulus of iron sand and the bonding effect of epoxy resin can also improve the reuse rate and anchoring efficiency of the anchor, and then place them for standby;

[0044] Then, place one end of the parallel plate to be formed in the pre-extrusion forming device, place a certain weight of weights on the forming upper steel plate 9 according to different plate diameter requirements, and then place the whole in a high-temperature furnace. After heating and forming are completed, repeat the above process for the other end of the parallel plate to be formed to obtain the parallel plate 3 with corrugated plates at both ends. Install an anchoring device at each corrugated plate end of the parallel plate 3, insert the flat plate section of the tail section into the corresponding wire dividing groove 6 to complete the spatial arrangement of multiple parallel plates 3, and use the glue filler 2 to fill the wire dividing groove 6. Each parallel plate 3 is corrected through the wire dividing hole 5-1 of the centering plate 5 so that the center lines of each layer and adjacent parallel plates 3 coincide with the center of the anchoring device, and use the glue filler 2 to fill the wire dividing hole 5-1, as Figure 5 shown, stuff the sealing rubber ring 7 between the two anchoring plates 1, and at the same time fix the centering plate 5 and the two upper and lower anchoring plates 1 with bolts 4;

[0045] Finally, a pressure syringe is used to inject the adhesive filler 2 along the circular wedge-shaped through holes 1-2 at different positions. The injection sequence of the circular wedge-shaped through holes 1-2 is to inject the side holes first and then the middle holes, which can ensure that the glue is evenly filled into the inner round holes and the remaining cavities of the steel plate. The injection is carried out in stages. After each stage of injection is completed, a pause of 3-6 minutes is made before the next injection to prevent the glue from not being fully filled due to the failure to discharge the internal gas in time until the filling overflows. After the injection is completed, the circular wedge-shaped through holes 1-2 are blocked with the sealing block 8 to avoid the extrusion phenomenon during the curing and expansion of the glue, resulting in interface relaxation. At the same time, pay attention to the skew phenomenon of the plate inside the anchor, which may lead to non-pure tensile force in the later stage. After the glue is cured, the tensile test can be carried out.

[0046] Example 1:

[0047] An anchoring system for a parallel plate cable of a thermoplastic resin matrix composite material, and the specific method is as follows:

[0048] First, take carbon fiber FRP (CFRP) plates with polypropylene as the resin matrix, with widths of 15 mm, 20 mm, and 25 mm respectively, 18 of each width CFRP plate. The surfaces are soaked in acetone, ultrasonically cleaned and wiped clean. Then, one end of each of the above CFRP plates is clamped in the pre-extrusion forming device, a 50 kg weight is placed on the forming upper steel plate, and they are placed in a high-temperature furnace at 180 °C for 4 hours. After heating and forming, the above procedure is repeated for the other end of the CFRP plate until both ends have corrugated plate patterns. Each of the 18 CFRP plates of each type is processed according to the above process;

[0049] Then, the above-mentioned same-type CFRP plates are installed on the anchoring device. The composite material plate is corrected by the integrated centering plate and fixed up and down with high-strength bolts. At the same time, the end of each layer of the plate is inserted into the corresponding rear wire splitting groove to make it have the best spatial arrangement. Then, a mixed filler of epoxy resin and iron sand is preferably poured into the wire splitting grooves that have been filled with each layer of the plate. Then, the rear wire splitting plate is clamped in the rear wire groove of the U-shaped groove steel plate so that each layer of the plate is parallel to each other. Then, the overall anchoring of the parallel plate cable is formed. At the same time, all gaps are sealed with a soft rubber ring, and the upper and lower U-shaped groove anchoring plates with wedge-shaped inner holes are tightened with fixing bolts;

[0050] Finally, the prepared epoxy iron sand filler is slowly injected into different reserved holes with a pressure syringe until the filling overflows. After the epoxy resin + iron sand filler is cured, the tensile test can be carried out. When the above three CFRP plates with different plate widths are subjected to the tensile test, the middle area of the plate is fractured by tension, and no debonding phenomenon occurs at the anchoring end.

[0051] Example 2:

[0052] First, take glass fiber FRP (GFRP) plates with polyether ether ketone as the resin matrix, with widths of 15 mm, 20 mm, and 25 mm respectively. There are 18 GFRP plates of each width. Soak the surfaces of the plates in acetone, ultrasonically clean them, and wipe them dry. Then, clamp one end of each of the above GFRP plates in a forming device, place a 50 kg weight on the upper steel plate, and place them together in a high-temperature furnace at 360 °C for 4 hours. After heating and forming, repeat the above procedure for the other end of the GFRP plates until both ends have the corrugated round tooth plate pattern. All 18 GFRP plates of each type are processed according to the above process.

[0053] Then, install the above-mentioned CFRP plates of the same type on the anchoring device, correct the composite material plates through an integrated centering plate and fix them up and down with high-strength bolts. At the same time, insert the end of each layer into the corresponding rear wire splitting groove to make it have the best spatial arrangement. Then, preferably pour a mixed filler of epoxy resin and iron sand into the wire splitting grooves that have been filled with each layer of plates. Then, clamp the rear wire splitting plate in the rear wire groove of the U-shaped groove steel plate to make each layer of plates parallel to each other. Then, form an overall anchoring of the parallel plate cables. At the same time, seal all the gaps with soft rubber rings and tighten the upper and lower U-shaped groove anchoring plates with wedge-shaped inner holes with fixing bolts.

[0054] Finally, use a pressure syringe to slowly inject the prepared epoxy iron sand filler into different reserved holes until it overflows. After the epoxy resin + iron sand filler cures, a tensile test can be carried out. During the tensile test of the above three CFRP plates with different widths, the middle area of the plates fractured, and no debonding occurred at the anchoring ends.

[0055] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various modifications and decorations without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims.

Claims

1. An anchoring system for parallel plate cables, characterized in that, it includes an anchoring device for anchoring parallel plates, a centering plate, an adhesive filler, and bolts. The anchoring device includes two anchoring plates with the same structure and arranged vertically opposite to each other. The anchoring plates are provided with three rows of parallel U-shaped grooves. The bottom of the U-shaped grooves includes several wedge-shaped bottoms with different heights and several equal large circular wedge-shaped through holes. After the two anchoring plates are butted, one end is an open end and the other end is a closed end. Along the thickness direction of the anchoring plate at the grooved position of the closed end, several dovetail clip-shaped wire dividing grooves are arranged in parallel. Both ends of the parallel plate are corrugated plates, and the tail section of the corrugated plate is a flat plate section. The flat plate section is inserted into the wire dividing grooves, and the other end of the corrugated plate passes through the wire dividing holes of the centering plate and exits from the open end. The centering plate is embedded in the open end. At the non-grooved position of the anchoring plate, several connecting holes are arranged along the length direction. The two butted anchoring plates are connected by bolts passing through the connecting holes, and the adhesive filler is filled into the cavity enclosed by the two butted anchoring plates through the circular wedge-shaped through holes; The centering plate and the anchoring plate are installed by bolts. The centering plate is provided with several wire dividing holes, and the number of wire dividing holes is the same as that of the wire dividing grooves, which plays a role in fixing the parallel plates and making the plates parallel to each other. And a sealing rubber ring is arranged between the wire dividing holes and the parallel plates; The parallel plate is a thermoplastic resin-based composite material plate.

2. The anchoring system for parallel plate cables according to claim 1, characterized in that, the corrugated plate of the parallel plate is a circular tooth surface, and the two-dimensional waveform line of the projection of the circular tooth surface conforms to the sine curve function. When the plate width is b, the amplitude is (0.1 - 0.4)b, the wavelength is (0.2 - 0.8)bπ, and the length of the flat plate section is 20 - 50 mm.

3. The anchoring system for parallel plate cables according to claim 2, characterized in that, the lateral distance between adjacent parallel plates is (0.5 - 8)b, and the longitudinal spacing is (0.3 - 0.5)b.

4. The anchoring system for parallel plate cables according to claim 1, characterized in that, the number of wire dividing holes is 18, and they are distributed in 3 rows and 6 columns.

5. The anchoring system for parallel plate cables according to claim 1, characterized in that, the wire dividing groove and the anchoring plate are of an integral structure or are mortised into one body.

6. The anchoring system for parallel plate cables according to claim 1, characterized in that, the adhesive filler is composed of epoxy resin and iron sand.

7. An anchoring method for parallel plate cables, characterized in that, applying the anchoring system for parallel plate cables according to claim 1, including the following steps: S1, using a pre-extrusion forming device to form a thermoplastic resin-based composite material plate into a parallel plate; S2, installing the parallel plate in the anchoring system, ensuring that the parallel plates are parallel to each other, and using the adhesive filler to fill the gaps between the adhesive filler, the wire dividing holes, and the wire dividing grooves, tightening the bolts, and stuffing sealing rubber rings between the two anchoring plates; S3, using a pressure syringe to inject the adhesive filler along the circular wedge-shaped through holes at different positions until it is filled and overflows. After the injection is completed, use a sealing block to block the circular wedge-shaped through holes.

8. The anchoring method for parallel plate cables according to claim 7, characterized in that, The injection sequence of the circular wedge-shaped through holes is to inject the side holes first and then the middle holes, and the injection is carried out in a staged manner. After each stage of injection is completed, a pause of 3 - 6 minutes is made before the next injection is carried out.

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