Thermoplastic resin composite material parallel rod cable forming device, anchoring system and method

Abstract

The invention discloses a thermoplastic resin composite material parallel rod cable forming device and an anchoring system and method, relates to the technical field of fiber reinforced resin composite material anchoring, and solves the problem that a traditional bonding type anchorage device is insufficient in anchoring efficiency due to the fact that a thermoplastic resin matrix composite material cable is large in deformation and prone to slipping and losing efficacy. A fixed centering piece and a spiral centering piece are arranged at the two ends of a steel anchor cylinder correspondingly; one end of each parallel rod cable is of a spiral structure and is arranged in the steel anchor cylinder, and the end of the spiral structure is connected with the fixed centering piece; the other end of the parallel rod cable penetrates through the spiral centering sheet to the outside of the steel anchor cylinder; and the steel anchor cylinder is filled with a bonding filler. According to the method, the designability advantage of heating, softening, cooling and forming of the thermoplastic resin-based composite material parallel rod cable is utilized, a rod cable anchoring area is manufactured into a spiral whole with a tail end hook, the physical friction-extrusion performance between the rod cable and a binding material is improved, and the anchoring efficiency of an anchoring system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fiber reinforced resin composite anchoring, in particular to a thermoplastic resin composite parallel rod cable forming device, an anchoring system and a method. Background Art

[0002] At present, the cables used in bridge structures and marine engineering are often made of steel. Steel cables have problems such as large mass limiting span, easy corrosion and fatigue damage. Fiber reinforced composite materials are lightweight, high strength, excellent corrosion resistance and good fatigue resistance, making them one of the effective ways to replace steel cables and solve the problems of large span, corrosion and fatigue of cables. However, the poor shear and lateral compression resistance of fiber composite cables makes the anchoring of fiber composite cables a problem. Therefore, it is urgent to develop a new anchoring system to achieve effective anchoring of fiber composite parallel cables.

[0003] According to the resin matrix, fiber-reinforced resin composites can be mainly divided into thermosetting resin-based composites and thermoplastic resin-based composites. Thermosetting resins are cross-linked and cured through chemical reactions, and a three-dimensional network cross-linked structure is formed after curing. Therefore, once the thermosetting resin is formed, it cannot be softened and processed for secondary processing (difficult to bend and process later), and the recycling rate is low. In addition, the thermosetting resin contains a large number of hydroxyl groups that can easily form hydrogen bonds with water, causing the thermosetting resin-based composites to easily absorb water, resulting in reduced durability. In contrast, thermoplastic resins have the characteristics of repeated molding, high toughness, low water absorption and high durability. This gives thermoplastic resin-based composites design properties such as bendability. Therefore, considering the mechanical properties, economic benefits and environmental protection, thermoplastic resin-based composites are selected to manufacture parallel rod cables and applied to new anchoring systems, showing a broader development potential.

[0004] At present, the anchoring system of composite parallel rods is mainly divided into a clamping anchoring system and a bonding anchoring system. The anchoring force of the clamping anchoring system mainly comes from the mechanical bite force and friction force generated by the clip, which has the advantages of easy operation and high anchoring efficiency. However, the clip is very easy to cut the rod, resulting in the damage of the parallel rod at the end of the clip, and the tensile strength of the rod cannot be fully exerted. Due to the poor shear and lateral compression resistance of fiber composite rods, fiber composite rods are prone to shear failure using a clamping anchoring system, so it is not suitable. The anchoring force of the bonding anchoring system mainly comes from the bonding force provided by the bonding medium, which has the advantages of no initial damage. However, its anchoring efficiency is affected by the bearing capacity of the bonding medium and the coordination of the deformation of the cable body and the bonding material. It is very easy to pull out and the cable slippage is too large. Due to the large deformation of the thermoplastic resin-based composite cable, the traditional bonding anchor is easy to slip and fail, resulting in insufficient anchoring efficiency. In summary, the current anchoring system design mainly focuses on the anchor itself, and is mainly aimed at thermosetting resin-based composite materials that cannot be bent and formed twice, and fails to fully utilize the design advantages of thermoplastic resin-based composite parallel rod cables (such as multiple forming and bending). This leads to the fact that the anchoring problems faced when using thermoplastic composite cables in large-span spatial structures such as bridges and marine engineering have not been properly solved. Therefore, it is very important to develop an anchoring system that is efficient, designable, simple and fast, and suitable for thermoplastic resin-based composite cables. Summary of the invention

[0005] In order to solve the problem of insufficient anchoring efficiency due to large deformation of thermoplastic resin-based composite cables and easy slippage and failure in traditional bonding anchors mentioned above, the present invention proposes a thermoplastic resin composite parallel rod cable molding device, anchoring system and method. The present invention makes full use of the designability advantages of heating, softening and cooling molding of thermoplastic resin-based composite parallel rod cables, and uses a spiral bending molding device to make the rod cable anchoring area into a spiral whole with an end hook, which increases the physical friction-extrusion performance between the entire rod cable and the bonding material, and greatly improves the anchoring efficiency of the anchoring system. The anchoring system is simple to operate, convenient to construct, has high anchoring efficiency and is suitable for all thermoplastic rod cable anchoring systems.

[0006] The present invention proposes a thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system, which specifically comprises a plurality of parallel rod cables, a spiral centering plate, a steel anchor barrel and a fixed centering plate, wherein a fixed centering plate is arranged at one end of the steel anchor barrel, and a spiral centering plate is arranged at the other end; one end of the plurality of parallel rod cables is a spiral structure, and is arranged inside the steel anchor barrel, and the end of the spiral structure is connected to the fixed centering plate; the other ends of the plurality of parallel rod cables pass through the spiral centering plate to the outside of the steel anchor barrel; and the steel anchor barrel is filled with adhesive filler.

[0007] Furthermore, three glue injection holes are arranged on the steel anchor cylinder.

[0008] Furthermore, the spiral centering plate and the steel anchor tube are connected by threads, and the spiral centering plate is fixed by a plurality of latches.

[0009] Furthermore, the wall thickness of the steel anchor barrel gradually decreases from the end where the spiral centering piece is arranged to the end where the fixed centering piece is arranged.

[0010] Furthermore, the bonding filler components include epoxy resin, iron sand and high-efficiency expansion agent, and the rigidity of the bonding filler is adjusted according to the added amount of the high-efficiency expansion agent.

[0011] An anchoring method using the thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system comprises the following steps:

[0012] S1. Pass the parallel rod through the spiral centering plate, steel anchor cylinder and fixed centering plate in sequence;

[0013] S2. Fix the fixed centering piece to the steel anchor barrel with threads, fix the parallel rod and the fixed centering piece, screw the spiral centering piece into the steel anchor barrel to apply a torque to the parallel rod and then fix it;

[0014] S3. The entire anchoring system is placed in a high-temperature oven for softening;

[0015] S4. Inject adhesive fillers with different stiffness into the steel anchor barrel along the injection holes at different positions on the steel anchor barrel.

[0016] A spiral bending forming device for preparing the above-mentioned thermoplastic resin-based composite material parallel rod variable stiffness anchoring system comprises a spiral bending track mold and a plurality of heating columns, wherein the plurality of heating columns are buried axially inside the spiral bending track mold; the spiral bending track mold is a truncated cone structure, and a plurality of spiral track grooves are coaxially arranged on the curved surface.

[0017] Furthermore, a plurality of limit clips are arranged on the spiral track groove.

[0018] Furthermore, a plurality of grooves are arranged on the bottom surface of the truncated cone with a larger area of ​​the spiral bending track mold, and the grooves are connected to the spiral track grooves.

[0019] Furthermore, the groove points to the center of the bottom surface of the spiral bending track mold, and a limit clamp is arranged on the groove.

[0020] The thermoplastic resin composite parallel rod cable forming device, anchoring system and method described in the present invention have the following beneficial effects:

[0021] (1) The thermoplastic resin composite parallel rod cable forming device, anchoring system and method described in the present invention overcome the problem of insufficient anchoring efficiency due to large deformation of thermoplastic resin-based composite cable and easy slippage failure of traditional bonding anchors, and also overcome the problem of significant local shear deformation caused by the clip of traditional clamping anchors on the thermoplastic resin-based composite cable, reducing the risk of local shear fracture. The present invention utilizes the designability of thermoplastic resin heating, melting and cooling molding, and uses a spiral bending molding device to make the anchoring part of the thermoplastic resin-based composite parallel rod cable into a spiral shape with an end hook, and through the effect of applying torsion to the spiral centering plate and heating in a high-temperature oven, the front end part of the spiral bending area of ​​the thermoplastic resin-based composite parallel rod cable forms a whole, which not only reduces the influence of the initial defects of the contact interface on the anchoring performance, but also increases the mechanical bite force and interface chemical connection performance between the entire parallel rod cable and the bonding material, increases the physical friction-extrusion performance between the entire rod cable and the bonding material, and greatly improves the anchoring efficiency of the anchoring system.

[0022] (2) The present invention discloses a thermoplastic resin composite parallel rod forming device, anchoring system and method. In the anchoring system, a fixed centering plate is threadedly fixed to a steel anchor barrel, and the parallel rods are fixed to the fixed centering plate by bending their ends. This allows part of the external load on the parallel rods to be transmitted to the fixed centering plate, which not only reduces the overall slippage of the parallel rods, but also makes the slippage of all parallel rods tend to be consistent, thereby reducing the influence of the clustering effect on the anchoring efficiency.

[0023] (3) The thermoplastic resin composite parallel rod forming device, anchoring system and method described in the present invention, when injecting adhesive filler into the steel anchor barrel, on the one hand, the filling order is to first close the holes in the part, then inject the holes in the tail, and finally inject the holes in the middle, so that the adhesive filler can fully fill the empty area in the steel anchor barrel; on the other hand, by adjusting the content of the high-efficiency expansion agent in the adhesive filler in a stepped manner, the expansion extrusion pressure generated by the adhesive filler gradually increases from the loading end of the anchor to the free end, thereby avoiding local shear damage at the loading end of the anchor due to stress concentration.

[0024] (4) The thermoplastic resin composite material parallel rod forming device, anchoring system and method described in the present invention heat the parallel rods in the spiral track groove by means of a heating column and a hot air gun arranged inside the spiral bending forming device, thereby ensuring the stability of the parallel rods when heated and the reliability after bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] In the attached picture:

[0027] Figure 1 It is a three-dimensional structural schematic diagram of a thermoplastic resin composite material parallel rod cable anchoring system according to the present invention;

[0028] Figure 2 It is a cross-sectional view of a thermoplastic resin composite parallel rod cable anchoring system (before the spiral centering piece is installed) according to the present invention;

[0029] Figure 3 It is a cross-sectional view of a thermoplastic resin composite parallel rod cable anchoring system according to the present invention;

[0030] Figure 4 It is a left view of a thermoplastic resin composite parallel rod cable anchoring system according to the present invention;

[0031] Figure 5 It is a right side view of a thermoplastic resin composite parallel rod cable anchoring system according to the present invention;

[0032] Figure 6 It is a three-dimensional structural schematic diagram of a thermoplastic resin composite material parallel rod cable forming device according to the present invention;

[0033] Figure 7 It is a right side view of a thermoplastic resin composite material parallel rod cable forming device according to the present invention;

[0034] Among them: 1- spiral bending track mold, 2- heating column, 3- groove, 4- limit clamp, 5- parallel rod cable, 6- latch, 7- spiral centering plate, 8- steel anchor cylinder, 9- fixed centering plate, 10- glue injection hole, 11- bonding filler, 12- spiral track groove. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the invention, it should be noted that, 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] like Figure 1-Figure 7 As shown, a thermoplastic resin-based composite material parallel rod variable stiffness anchoring system described in the present invention specifically includes a plurality of parallel rods 5, a spiral centering piece 7, a steel anchor cylinder 8 and a fixed centering piece 9, one end of the steel anchor cylinder 8 is provided with a fixed centering piece 9, and the other end is provided with a spiral centering piece 7; one end of the plurality of parallel rods 5 is a spiral structure, and is arranged inside the steel anchor cylinder 8, the end of the spiral structure is a 90-degree bending structure and is connected to the fixed centering piece 9 through the bending structure; the other ends of the plurality of parallel rods 5 pass through the spiral centering piece 7 to the outside of the steel anchor cylinder 8; the steel anchor cylinder 8 is filled with an adhesive filler 11.

[0040] The steel anchor cylinder 8 is provided with three glue injection holes 10 , through which adhesive fillers 11 are injected into the steel anchor cylinder 8 .

[0041] The spiral centering piece 7 and the steel anchor tube 8 are connected by threads, and the spiral centering piece 7 is fixed by a plurality of latches 6 .

[0042] The wall thickness of the steel anchor cylinder 8 gradually decreases from the end where the spiral centering piece 7 is provided to the end where the fixed centering piece 9 is provided, so that the internal space of the steel anchor cylinder 8 has a conical structure, such as Figure 2-Figure 3As shown; the wall thickness of the steel anchor tube 8 at the location where the fixed centering piece 9 is installed is greater than or equal to 5mm and less than 20mm, and the wall thickness of the steel anchor tube 8 at the location where the spiral centering piece 7 is installed is greater than or equal to 10mm and less than 50mm. A plurality of fixing grooves are provided on the fixed centering piece 9, and the bending structure at the end of the spiral structure of the parallel rod cable 5 passes through the fixed centering piece 9 and is embedded in the fixing groove on the fixed centering piece 9; the depth of the fixing groove is greater than or equal to 2mm but does not exceed the diameter of the parallel rod cable 5, so as to ensure the effective fixation of the parallel rod cable 5 and the fixed centering piece 9, thereby achieving the effect of reducing the overall slippage of the parallel rod cable 5.

[0043] The adhesive filler 11 comprises epoxy resin, iron sand and high-efficiency expansion agent. The rigidity of the adhesive filler 11 is adjusted according to the amount of the high-efficiency expansion agent added. The variable rigidity of the adhesive filler 11 is achieved by adding different amounts of high-efficiency expansion agent to the adhesive filler. The content of high-efficiency expansion agent in the adhesive filler 11 inside the steel anchor cylinder 8 increases in a step-like manner from the fixed centering plate 9 to the spiral centering plate 7.

[0044] An anchoring method using the thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system comprises the following steps:

[0045] S1, pass the parallel rod 5 through the spiral centering piece 7, the steel anchor cylinder 8 and the fixed centering piece 9 in sequence;

[0046] S2, the fixed centering piece 9 is threadedly fixed to the steel anchor tube 8, the parallel rod 5 is fixed to the fixed centering piece 9, the spiral centering piece 7 is screwed into the steel anchor tube 8 to apply a torque to the parallel rod 5, and then the spiral centering piece 7 is fixed with the pin 6; the application of the torque makes the spiral structure area of ​​the front end of the parallel rod 5 close to each other;

[0047] S3, the entire anchoring system is put into a high-temperature oven for softening, and the softening temperature of the high-temperature oven is determined according to the softening temperature of the thermoplastic resin used in the parallel rod cable 5; under the action of the high-temperature oven heating, the resin in the spiral structure area close to the front end of the parallel rod cable 5 is melted and bonded into a whole;

[0048] S4. Inject adhesive fillers 11 of different stiffness into the remaining space of the steel anchor tube 8 along the injection holes 10 at different positions on the steel anchor tube 8 through a pressure injector; the injection order of the injection holes 10 is to first inject the injection holes 10 in the closed part of the spiral area of ​​the parallel rod cable 5, that is, the injection holes 10 close to the fixed centering piece 9; then inject the adhesive filler 11 into the injection holes 10 close to the spiral centering piece 7; finally, inject the adhesive filler 11 into the injection holes 10 in the middle position; after each injection hole 10 is injected, pause for 4-8 minutes before the next injection.

[0049] A spiral bending forming device for preparing the above-mentioned thermoplastic resin-based composite material parallel rod variable stiffness anchoring system comprises a spiral bending track mold 1 and a plurality of heating columns 2, wherein the plurality of heating columns 2 are axially buried inside the spiral bending track mold 1; the spiral bending track mold 1 is a truncated cone structure, and a plurality of spiral track grooves 12 are coaxially arranged on the curved surface; the heating column 2 is a spiral structure, and its spiral track is consistent with the spiral track groove 12; the heating column 2 cooperates with an external auxiliary heating hot air gun, and utilizes the thermoplastic resin heating, melting and cooling forming principle to make the anchoring part of the parallel rod 5 into a spiral shape with an end hook.

[0050] A plurality of limit clips 4 are arranged on the spiral track groove 12 to limit the unprocessed parallel rod cable 5; the limit clips 4 are arranged on the spiral track groove 12 at intervals of 25 mm to 75 mm along the spiral track groove 12.

[0051] The spiral bending track mold 1 has a relatively large truncated cone bottom surface on which a plurality of grooves 3 are arranged, and the grooves 3 are connected to the spiral track groove 12 .

[0052] The groove 3 points to the bottom center of the spiral bending track mold 1, and a limit clamp 4 is arranged on the groove 3; the length of the groove 3 is 10mm-30mm. Specific implementation method one:

[0054] First, take 12 carbon fiber reinforced acrylic composite rods with a diameter of 5mm as parallel rods 5, and fix the parallel rods 5 to the spiral bending track mold 1 through a fixing clamp for spiral bending. The spiral track groove 12 of the spiral bending track mold 1 has 3 turns, and the diameter of the spiral track groove 12 is 5.5mm; the groove 3 at the bottom is 20mm long and 2.5mm deep; a limit clamp 4 is set every 50mm on the spiral track groove 12, and the temperature of the heating column 2 is set to 230℃, and auxiliary heating is performed by a hot air gun to ensure that the anchoring area of ​​the parallel rod 5 is completely in contact with the track mold. After being stored at room temperature for 24 hours, the limit clamp 4 is opened, and the anchoring part is removed to make a spiral parallel rod 5 with an end hook.

[0055] Then, the processed parallel rod 5 is passed through the spiral centering piece 7, the steel anchor cylinder 8 and the fixed centering piece 9 in turn. The minimum wall thickness of the steel anchor cylinder 8 is 5mm, and the thickness of the spiral centering piece 7 and the fixed centering piece 9 is 20mm. The fixed centering piece 9 is threadedly fixed to the steel anchor cylinder 8, and the end of the parallel rod 5 is bent and fixed to the fixed groove of the fixed centering piece 9. The spiral centering piece 7 is screwed into the steel anchor cylinder for one circle, and the position is fixed with the pin 6, so that the front end part of the spiral bending area of ​​all the thermoplastic resin-based composite material parallel rods 5 is close. The entire anchoring device is placed in a high-temperature oven for softening, so that the thermoplastic resin-based composite material parallel rod 5 close to the resin melts and bonds into a whole. The softening temperature is 230°C and the softening time is 2h. After softening, it is stored at room temperature for 24h for cooling and molding.

[0056] Finally, three kinds of adhesive fillers 11 with different contents of high-efficiency expansion agents were prepared. The first kind consisted of 60g epoxy resin, 100g iron sand and 30g high-efficiency expansion agent; the second kind consisted of 60g epoxy resin, 100g iron sand and 40g high-efficiency expansion agent; the third kind consisted of 60g epoxy resin, 100g iron sand and 50g high-efficiency expansion agent. The epoxy resin was TS epoxy resin provided by Shandong Dagong Composite Materials Co., Ltd., the diameter of the iron sand was 1mm, and the high-efficiency expansion agent was UEA expansion agent produced by Jianfeng Hongda Formula. Different adhesive fillers were filled into the remaining space of the steel anchor barrel along the circular wedge-shaped through holes at different positions of the steel anchor barrel by a pressure injector. The content of the high-efficiency expansion agent increased stepwise from the large-diameter end to the small-diameter end of the tapered through hole. The filling order was to prioritize the holes where the parallel rods were bonded into an integral part, then inject the holes at the tail, and finally inject the holes in the middle. After each hole was injected, it was paused for 4-8 minutes before the next injection.

[0057] After the bonding material is cured, a tensile test is carried out, and the tensile strength of the thermoplastic resin matrix carbon fiber composite parallel rod cable is 1882MPa and the elastic modulus is 146.27GPa. The failure mode is an ideal burst of the free section of the specimen, which shows that this anchoring system can effectively anchor the thermoplastic resin matrix carbon fiber composite parallel rod cable. Specific implementation method 2:

[0059] The difference between this embodiment and embodiment 1 is that: the diameter is 5 mm, 20 carbon fiber reinforced nylon composite rods are used as parallel rods 5, a limit clamp 4 is set every 40 mm, the temperature of the heating column 2 is set to 215°C, and the number of spiral turns in the anchoring area of ​​the parallel rod 5 is 6. The spiral centering piece 7 is screwed into the steel anchor cylinder 8 for 1 / 2 turn. The high temperature oven softening temperature is set to 215°C, and the softening time is set to 2h. Six kinds of adhesive fillers 11 with different contents of high-efficiency expansion agents were prepared, the first kind was composed of 60g epoxy resin, 100g iron sand and 30g high-efficiency expansion agent; the second kind was composed of 60g epoxy resin, 100g iron sand and 35g high-efficiency expansion agent; the third kind was composed of 60g epoxy resin, 100g iron sand and 40g high-efficiency expansion agent; the fourth kind was composed of 60g epoxy resin, 100g iron sand and 45g high-efficiency expansion agent; the fifth kind was composed of 60g epoxy resin, 100g iron sand and 50g high-efficiency expansion agent; the sixth kind was composed of 60g epoxy resin, 100g iron sand and 55g high-efficiency expansion agent. The remaining operations and parameter settings are the same as those in embodiment 1.

[0060] After the bonding filler 11 is cured, a tensile test is performed, and the tensile strength of the thermoplastic resin matrix carbon fiber composite parallel rod cable 5 is 1967MPa and the elastic modulus is 150.52GPa. The failure mode is an ideal sample free section burst, which shows that the anchoring system can effectively anchor the thermoplastic resin matrix carbon fiber composite parallel rod cable.

[0061] To summarize the above implementation cases, the thermoplastic resin composite parallel rod cable forming device, anchoring system and method described in the present invention utilize the designability of thermoplastic resin heating, melting and cooling molding, and adopt a spiral bending molding device to make the anchoring part of the thermoplastic resin-based composite parallel rod cable 5 into a spiral shape with an end hook, and apply torque to the spiral centering plate 7 and the high-temperature oven heating effect, so that the front end part of the spiral bending area of ​​the thermoplastic resin-based composite parallel rod cable 5 forms a whole, which not only reduces the influence of the initial defects of the contact interface on the anchoring performance, but also increases the mechanical bite force and interface chemical connection performance between the entire parallel rod cable 5 and the bonding filler 11, increases the physical friction-extrusion performance between the entire parallel rod cable 5 and the bonding filler 11, and greatly improves the anchoring efficiency of the anchoring system. The present invention discloses a thermoplastic resin composite parallel rod cable forming device, anchoring system and method. In the anchoring system, the fixed centering piece 9 is threadedly fixed to the steel anchor barrel 8, and the parallel rod 5 is fixed to the fixed centering piece 9 by bending the end, so that part of the external load on the parallel rod 5 can be transmitted to the fixed centering piece 9, which can not only reduce the overall slippage of the parallel rod 5, but also make the slippage of all parallel rods 5 tend to be consistent, reducing the influence of the clustering effect on the anchoring efficiency. The present invention discloses a thermoplastic resin composite parallel rod cable forming device, anchoring system and method. When injecting the bonding filler 11 into the steel anchor barrel 8, on the one hand, the filling sequence is to first close the holes of the part, then inject the holes of the tail, and finally inject the holes in the middle, so that the bonding filler 11 can fully fill the empty area in the steel anchor barrel 8; on the other hand, by adjusting the content of the high-efficiency expansion agent in the bonding filler 11 to be stepped, the expansion and extrusion force generated by the bonding filler 11 gradually increases from the loading end of the anchor to the free end, avoiding the local shear failure caused by stress concentration at the loading end of the anchor. The thermoplastic resin composite parallel rod cable forming device, anchoring system and method described in the present invention heat the parallel rod cables 5 in the spiral track groove 12 through the cooperation of the heating column 2 and the hot air gun arranged inside the spiral bending forming device, thereby ensuring the stability of the parallel rod cables 5 when heated and the reliability after bending.

[0062] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the invention. It can also be a reasonable combination of the features recorded in the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system, characterized in that: The invention comprises a plurality of parallel rods (5), a spiral centering plate (7), a steel anchor cylinder (8) and a fixed centering plate (9), wherein one end of the steel anchor cylinder (8) is provided with a fixed centering plate (9), and the other end is provided with a spiral centering plate (7); one end of the plurality of parallel rods (5) is a spiral structure and is arranged inside the steel anchor cylinder (8), and the end of the spiral structure is connected to the fixed centering plate (9); the other end of the plurality of parallel rods (5) passes through the spiral centering plate (7) to the outside of the steel anchor cylinder (8); and the steel anchor cylinder (8) is filled with an adhesive filler (11).

2. The thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system according to claim 1, characterized in that: The steel anchor cylinder (8) is provided with three glue injection holes (10).

3. The thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system according to claim 1, characterized in that: The spiral centering piece (7) and the steel anchor cylinder (8) are connected by threads, and the spiral centering piece (7) is fixed by a plurality of latches (6).

4. The thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system according to claim 1, characterized in that: The wall thickness of the steel anchor cylinder (8) gradually decreases from one end where the spiral centering piece (7) is provided to one end where the fixed centering piece (9) is provided.

5. The thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system according to claim 1, characterized in that: The bonding filler (11) comprises epoxy resin, iron sand and a high-efficiency expansion agent, and the rigidity of the bonding filler (11) is adjusted according to the amount of the high-efficiency expansion agent added.

6. An anchoring method using the thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system according to claim 2, characterized in that: The following steps are involved: S1. Pass the parallel rod cable (5) through the spiral centering plate (7), the steel anchor cylinder (8) and the fixed centering plate (9) in sequence; S2, screw the fixed centering piece (9) and the steel anchor cylinder (8), fix the parallel rod (5) and the fixed centering piece (9), screw the spiral centering piece (7) into the steel anchor cylinder (8) to apply a torsional force to the parallel rod (5) and then fix it; S3. The entire anchoring system is placed in a high-temperature oven for softening; S4. Injecting adhesive fillers (11) of different stiffness into the steel anchor cylinder (8) along the glue injection holes (10) at different positions on the steel anchor cylinder (8).

7. A spiral bending and forming device for preparing the parallel rod cable of the thermoplastic resin-based composite material parallel rod cable variable stiffness anchoring system according to claim 1, characterized in that: The invention comprises a spiral bending track mold (1) and a plurality of heating columns (2), wherein the plurality of heating columns (2) are buried axially inside the spiral bending track mold (1); the spiral bending track mold (1) is a truncated cone structure, and a plurality of spiral track grooves (12) are coaxially arranged on the curved surface.

8. The spiral bending forming device according to claim 7, characterized in that: A plurality of limit clips (4) are arranged on the spiral track groove (12).

9. The spiral bending forming device according to claim 7, characterized in that: A plurality of grooves (3) are arranged on the bottom surface of the truncated cone with a relatively large area of ​​the spiral bending track mold (1), and the grooves (3) are connected to the spiral track groove (12).

10. The spiral bending forming device according to claim 9, characterized in that: The groove (3) points to the center of the bottom surface of the spiral bending track mold (1), and a limit clamp (4) is arranged on the groove (3).

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