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

Abstract

This invention discloses a thermoplastic resin composite parallel bar cable forming device, anchoring system, and method, relating to the field of fiber-reinforced resin composite material anchoring technology. It solves the problem of insufficient anchoring efficiency in traditional bonded anchors due to the large deformation and slippage of thermoplastic resin-based composite cables. The invention features a steel anchor cylinder with a fixed centering plate and a spiral centering plate at both ends; several parallel bars have a spiral structure at one end, located inside the steel anchor cylinder, with the spiral end connected to the fixed centering plate; the other end of the parallel bars passes through the spiral centering plate to the outside of the steel anchor cylinder; the steel anchor cylinder is filled with adhesive filler. This invention utilizes the design flexibility of the thermoplastic resin-based composite material parallel bars cable through heating, softening, and cooling to form a spiral-shaped integral structure with end hooks, increasing the physical friction-compression performance between the bars and the adhesive material, thus improving the anchoring efficiency of the anchoring system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fiber reinforced resin composite anchoring technology, in particular to a thermoplastic resin composite parallel rod cable forming device, anchoring system and method. BACKGROUND

[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. The light weight, high strength, excellent corrosion resistance and good fatigue resistance of fiber reinforced composites have become 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 difficult problem. Therefore, it is urgent to develop a new type of anchoring system to effectively anchor the fiber composite parallel rod cable.

[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 resin is cross-linked and cured through chemical reaction, and forms a three-dimensional network structure after curing. Therefore, once the thermosetting resin is formed, it cannot be softened and processed again (difficult to be processed after bending), and the recycling rate is low. In addition, the thermosetting resin contains a large number of hydroxyl groups which are easy to form hydrogen bonds with water, resulting in the thermosetting resin based composites being easy to absorb water and cause durability to decline. In contrast, thermoplastic resin has the characteristics of repeated molding, high toughness, low water absorption and high durability. This gives the thermoplastic resin based composites the designability of being bendable. Therefore, considering the mechanical properties, economic benefits and environmental protection, the thermoplastic resin based composites are selected to manufacture parallel rod cables and applied in new anchoring systems, which shows more broad development potential.

[0004] At present, the anchoring system of composite parallel rod cable is mainly divided into clamping type anchoring system and bonding type anchoring system. The anchoring force of clamping type anchoring system mainly comes from the mechanical bite force and friction force generated by the clamping piece, which has the advantages of convenient operation, high anchoring efficiency and the like. However, the clamping piece is easy to cut the rod cable, so that the damage of the parallel rod cable is prone to occur at the end of the clamping piece, and the tensile strength of the rod cable cannot be fully utilized. Since the shear and transverse compression resistance of the fiber composite rod cable is poor, the clamping type anchoring system is not suitable for the fiber composite rod cable. The anchoring force of the bonding type anchoring system mainly comes from the bonding force provided by the bonding medium, which has the advantages of no initial damage and the like. However, the anchoring efficiency is affected by the bearing capacity of the bonding medium and the deformation coordination of the cable body and the bonding material, and the pull-out damage and excessive cable slip are prone to occur. The traditional bonding type anchoring device is not efficient due to the large deformation of the thermoplastic resin-based composite cable and the easy slippage failure. In summary, the current anchoring system design mainly focuses on the anchoring device itself, and mainly aims at the thermosetting resin-based composite material which cannot be secondarily bent and formed, and the designability advantage (such as multiple forming and bending) of the thermoplastic resin-based composite parallel rod cable cannot be fully utilized, which leads to the anchoring problem of the thermoplastic composite cable in the large-span space structure such as bridge and ocean engineering, which cannot be properly solved. Therefore, it is very important to develop an anchoring system which is efficient, simple and quick to design and suitable for thermoplastic resin-based composite cable. SUMMARY

[0005] In order to solve the problem of insufficient anchoring efficiency of the traditional bonding type anchoring device due to the large deformation of the thermoplastic resin-based composite cable and the easy slippage failure, a thermoplastic resin composite parallel rod cable forming device, anchoring system and method are provided. The anchoring system fully utilizes the designability advantage of the heating, softening and cooling forming of the thermoplastic resin-based composite parallel rod cable, and the anchoring region of the rod cable is made into a spiral whole with a terminal hook through a spiral bending forming device, which increases the physical friction and extrusion performance between the whole 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, high in anchoring efficiency and suitable for all thermoplastic rod cable anchoring systems.

[0006] The application provides a thermoplastic resin-based composite parallel rod cable variable stiffness anchoring system, which specifically comprises a plurality of parallel rod cables, a spiral centering piece, a steel anchor cylinder and a fixed centering piece. The steel anchor cylinder is provided with the fixed centering piece at one end and the spiral centering piece at the other end. The one end of the plurality of parallel rod cables is in a spiral structure and arranged in the interior of the steel anchor cylinder, and the end of the spiral structure is connected with the fixed centering piece. The other end of the plurality of parallel rod cables penetrates through the spiral centering piece to the outside of the steel anchor cylinder. The steel anchor cylinder is filled with a bonding filler.

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

[0008] Further, the spiral centering piece and the steel anchor cylinder are connected through threads and the spiral centering piece is fixed through several bolts.

[0009] Further, the thickness of the steel anchor cylinder gradually decreases from one end where the spiral centering piece is arranged to one end where the fixing centering piece is arranged.

[0010] Further, the adhesive filler is composed of epoxy resin, iron sand and high-efficiency expanding agent, and the rigidity of the adhesive filler is adjusted according to the adding amount of the high-efficiency expanding agent.

[0011] An anchoring method of the parallel rod cable variable rigidity anchoring system of the thermoplastic resin-based composite material, comprising the following steps:

[0012] S1, the parallel rod cable is sequentially threaded through the spiral centering piece, the steel anchor cylinder and the fixing centering piece;

[0013] S2, the fixing centering piece is threadedly fixed with the steel anchor cylinder, the parallel rod cable is fixed with the fixing centering piece, and the spiral centering piece is screwed into the steel anchor cylinder to apply a torsion to the parallel rod cable and then fixed;

[0014] S3, the whole anchoring system is placed into a high-temperature oven for softening;

[0015] S4, the adhesive fillers with different rigidities are injected into the steel anchor cylinder through the glue injection holes arranged at different positions on the steel anchor cylinder.

[0016] A spiral bending forming device for preparing the parallel rod cable of the parallel rod cable variable rigidity anchoring system of the thermoplastic resin-based composite material, comprising a spiral bending track mold and several heating columns, the several heating columns are axially embedded in the inside of the spiral bending track mold; the spiral bending track mold is a circular table structure, and a plurality of spiral track grooves are coaxially arranged on the curved surface.

[0017] Further, the spiral track grooves are provided with several limiting clamps.

[0018] Further, the circular table bottom surface with a larger area of the spiral bending track mold is provided with several grooves, and the grooves and the spiral track grooves are communicated.

[0019] Further, the grooves point to the center of the bottom surface of the spiral bending track mold, and the grooves are provided with limiting clamps.

[0020] The parallel rod cable forming device, anchoring system and method of the thermoplastic resin composite material have the following beneficial effects:

[0021] (1) The parallel rod cable forming device, anchoring system and method of the thermoplastic resin composite material overcome the problem of insufficient anchoring efficiency caused by the large deformation of the thermoplastic resin-based composite cable, easy slippage and failure of the traditional bonding type anchor, and also overcome the problem of significant local shear deformation of the thermoplastic resin-based composite cable caused by the clamping piece of the traditional clamping type anchor, reducing the risk of local shear fracture. The application utilizes the designability of thermoplastic resin heating, melting and cooling forming, and uses a spiral bending forming device to make the anchoring part of the thermoplastic resin-based composite parallel rod cable into a spiral shape with a terminal hook, and through the action of the spiral centering piece and the high temperature oven, the front end part of the spiral bending area of the thermoplastic resin-based composite parallel rod cable forms an integral 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, and increases the physical friction-extrusion performance between the entire rod cable and the bonding material, greatly improving the anchoring efficiency of the anchoring system.

[0022] (2) The parallel rod cable forming device, anchoring system and method of the thermoplastic resin composite material, the fixed centering piece is threadedly fixed with the steel anchor cylinder in the anchoring system, and the parallel rod cable is fixed with the fixed centering piece through end bending, so that part of the external load acting on the parallel rod cable can be transmitted to the fixed centering piece, not only reducing the overall slippage of the parallel rod cable, but also making the slippage of all parallel rod cables consistent, reducing the influence of the bunching effect on the anchoring efficiency.

[0023] (3) The parallel rod cable forming device, anchoring system and method of the thermoplastic resin composite material, when injecting the bonding filler into the steel anchor cylinder, on the one hand, the filling sequence is to preferentially close the holes in the tail part, then inject the holes in the middle part, so that the bonding filler can fully fill the empty area in the steel anchor cylinder; on the other hand, by adjusting the content of the high-efficiency expanding agent in the bonding filler to be ladder-shaped, the expansion and extrusion force generated by the bonding filler gradually increases from the loading end of the anchor to the free end, avoiding local shear failure of the loading end of the anchor due to stress concentration.

[0024] (4) The parallel rod cable forming device, anchoring system and method of the thermoplastic resin composite material, the heating column and hot air gun inside the spiral bending forming device are used to heat the parallel rod cable in the spiral track groove, ensuring the stability of the parallel rod cable under heating and the reliability after bending. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings, and their description, are presented to explain the application and not to limit or define the application unnecessarily.

[0026] In the drawings:

[0027] Figure 1 is a perspective view of a thermoplastic resin composite parallel rod cable anchoring system according to the present application;

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

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

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

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

[0032] Figure 6 is a perspective view of a thermoplastic resin composite parallel rod cable forming device according to the present application;

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

[0034] wherein: 1 - spiral bending trajectory mold, 2 - heating column, 3 - groove, 4 - limiting clamp, 5 - parallel rod cable, 6 - bolt, 7 - spiral centering piece, 8 - steel anchor cylinder, 9 - fixed centering piece, 10 - glue injection hole, 11 - adhesive filler, 12 - spiral trajectory groove. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

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

[0039] As Figures 1-7 The parallel rod cable stiffness anchoring system of the thermoplastic resin-based composite material of the present application specifically comprises a plurality of parallel rod cables 5, a spiral centering piece 7, a steel anchor cylinder 8 and a fixed centering piece 9. The steel anchor cylinder 8 is provided with the fixed centering piece 9 at one end and the spiral centering piece 7 at the other end. The plurality of parallel rod cables 5 are provided with a spiral structure at one end and arranged inside the steel anchor cylinder 8. The end of the spiral structure is a 90-degree bending structure and connected to the fixed centering piece 9 through the bending structure. The other end of the plurality of parallel rod cables 5 passes through the spiral centering piece 7 to the outside of the steel anchor cylinder 8. The steel anchor cylinder 8 is filled with adhesive filler 11.

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

[0041] 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 bolts 6.

[0042] The thickness of the steel anchor cylinder 8 gradually decreases from the end where the spiral centering piece 7 is arranged to the end where the fixed centering piece 9 is arranged, so that the internal space of the steel anchor cylinder 8 is in a conical structure, as Figures 2-3The wall thickness of the steel anchor cylinder 8 at the position where the fixing centering piece 9 is installed is greater than or equal to 5 mm and less than 20 mm, and the wall thickness of the steel anchor cylinder 8 at the position where the spiral centering piece 7 is installed is greater than or equal to 10 mm and less than 50 mm. A plurality of fixing grooves are arranged on the fixing centering piece 9, and the bending structure at the end of the spiral structure of the parallel rod cable 5 passes through the fixing centering piece 9 and is embedded into the fixing grooves on the fixing centering piece 9; the depth of the fixing grooves is greater than or equal to 2 mm but does not exceed the diameter of the parallel rod cable 5, so as to ensure the effective fixing of the parallel rod cable 5 and the fixing centering piece 9, thereby realizing the function of reducing the overall slip amount of the parallel rod cable 5.

[0043] The components of the adhesive filler 11 include epoxy resin, iron sand and high-efficiency expanding agent, the rigidity of the adhesive filler 11 is adjusted according to the adding amount of the high-efficiency expanding agent, and the variable rigidity of the adhesive filler 11 is realized by adding different contents of the high-efficiency expanding agent in the adhesive filler. The content of the high-efficiency expanding agent in the adhesive filler 11 inside the steel anchor cylinder 8 is increased in a stepped manner from the fixing centering piece 9 to the spiral centering piece 7.

[0044] An anchoring method of the parallel rod cable variable rigidity anchoring system of the thermoplastic resin-based composite material, comprising the following steps:

[0045] S1, the parallel rod cable 5 is sequentially threaded through the spiral centering piece 7, the steel anchor cylinder 8 and the fixing centering piece 9;

[0046] S2, the fixing centering piece 9 is threadedly fixed with the steel anchor cylinder 8, the parallel rod cable 5 is fixed with the fixing centering piece 9, the spiral centering piece 7 is screwed into the steel anchor cylinder 8 to apply a torsion to the parallel rod cable 5, and then the spiral centering piece 7 is fixed by using the bolt 6; the spiral structure region at the front end of the parallel rod cable 5 is tightly attached by the application of the torsion;

[0047] S3, the entire anchoring system is placed 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 heating of the high-temperature oven, the resin of the spiral structure region at the front end of the parallel rod cable 5 is melted and bonded into a whole;

[0048] S4, different rigidity adhesive fillers 11 are injected into the remaining space of the steel anchor cylinder 8 through the glue injection holes 10 at different positions on the steel anchor cylinder 8 by using a pressure injector; the injection sequence of the glue injection holes 10 is that the glue injection holes 10 close to the fixing centering piece 9, i.e. the closed part of the spiral region of the parallel rod cable 5, are injected first, then the glue injection holes 10 close to the spiral centering piece 7 are injected, and finally the glue injection holes 10 at the middle position are injected; after the injection of each glue injection hole 10 is completed, the next injection is performed after a pause of 4-8 min.

[0049] The application discloses a spiral bending forming device for preparing a parallel cable of a thermoplastic resin-based composite parallel cable anchoring system, and belongs to the technical field of the parallel cable anchoring system.

[0050] The spiral track groove 12 is provided with a plurality of limiting clamps 4 for limiting the unprocessed parallel cable 5; the limiting clamps 4 are arranged on the spiral track groove 12 and are arranged at intervals of 25mm-75mm along the spiral track groove 12.

[0051] The spiral bending track mold 1 is provided with a plurality of grooves 3 on the large-area circular table bottom surface, and the grooves 3 are communicated with the spiral track groove 12.

[0052] The grooves 3 are directed to the bottom center of the spiral bending track mold 1, and the grooves 3 are provided with limiting clamps 4; the length of the groove 3 is 10mm-30mm. Specific embodiment one:

[0054] Firstly, 12 carbon fiber reinforced acrylic composite rods with a diameter of 5mm are taken as the parallel cables 5, the parallel cables 5 are fixed on the spiral bending track mold 1 through fixing clamps for spiral bending processing. The spiral track groove 12 of the spiral bending track mold 1 has three turns, and the diameter of the spiral track groove 12 is 5.5mm; the length of the groove 3 at the bottom is 20mm, and the depth is 2.5mm; one limiting clamp 4 is arranged on the spiral track groove 12 at intervals of 50mm, the temperature of the heating column 2 is set to 230 DEG C, and the heating column 2 is assisted by a hot air gun to ensure that the anchoring area of the parallel cable 5 is completely attached to the track mold. After being stored at room temperature for 24h, the limiting clamps 4 are opened, and the anchoring part is taken out to form the parallel cable 5 with a spiral shape and a terminal hook.

[0055] Then, the finished parallel rod cable 5 is threaded 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 5 mm, and the thickness of the spiral centering piece 7 and the fixed centering piece 9 is 20 mm. The fixed centering piece 9 is threadedly fixed with the steel anchor cylinder 8, and the end of the parallel rod cable 5 is bent and fixed with the fixed groove of the fixed centering piece 9. The spiral centering piece 7 is screwed into the steel anchor cylinder 1 turn, and the position is fixed with the bolt 6, so that the front end of the spiral bending area of the thermoplastic resin matrix carbon fiber composite parallel rod cable 5 is tightly attached. The entire anchoring device is placed in a high-temperature oven for softening, so that the thermoplastic resin matrix carbon fiber composite parallel rod cable 5 is tightly attached and the part of the resin is melted and bonded 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 shaping.

[0056] Finally, three kinds of adhesive fillers 11 with different contents of high-efficiency expanding agent are prepared, the first one is composed of 60g of epoxy resin, 100g of iron sand and 30g of high-efficiency expanding agent; the second one is composed of 60g of epoxy resin, 100g of iron sand and 40g of high-efficiency expanding agent; and the third one is composed of 60g of epoxy resin, 100g of iron sand and 50g of high-efficiency expanding agent. The epoxy resin is TS epoxy resin provided by Shandong Dawu Composite Material Co., Ltd., the iron sand has a diameter of 1mm, and the high-efficiency expanding agent is UEA type expanding agent produced by Jianfeng Hongda Formula. Different adhesive fillers are injected into the remaining space of the steel anchor cylinder through the circular wedge-shaped through hole of the steel anchor cylinder by a pressure injector. The content of the high-efficiency expanding agent increases in steps from the large-aperture end to the small-aperture end of the tapered through hole, and the filling sequence is to preferentially fill the holes of the integral part of the parallel rod cable, then to fill the holes at the tail, and finally to fill the holes in the middle. After each hole is injected, it is stopped for 4-8min before the next injection.

[0057] After the adhesive material is cured, a tensile test is performed, and the tensile strength of the thermoplastic resin matrix carbon fiber composite parallel rod cable is obtained through the test, which is 1882MPa, and the elastic modulus is 146.27GPa. The failure mode is the ideal sample free section burst, and it can be seen that the anchoring system can effectively anchor the thermoplastic resin matrix carbon fiber composite parallel rod cable. Specific implementation method two:

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

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

[0061] Summarizing the above implementation cases, the thermoplastic resin composite parallel rod cable forming device, anchoring system and method disclosed by the application utilizes the designability characteristics of thermoplastic resin heating, melting and cooling forming, adopts a spiral bending forming device to make the anchoring part of the thermoplastic resin-based composite parallel rod cable 5 into a spiral shape with a terminal hook, and through the action of the spiral centering piece 7 and the high-temperature oven heating, the front end part of the spiral bending area of the thermoplastic resin-based composite parallel rod cable 5 forms an integral 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 the interface chemical connection performance between the entire parallel rod cable 5 and the adhesive filler 11, and increases the physical friction-extrusion performance between the entire parallel rod cable 5 and the adhesive filler 11, greatly improving the anchoring efficiency of the anchoring system. The thermoplastic resin composite parallel rod cable forming device, anchoring system and method disclosed by the application, the fixed centering piece 9 is threadedly fixed with the steel anchor cylinder 8 in the anchoring system, and the parallel rod cable 5 is fixed through the end bending and the fixed centering piece 9, so that part of the external load acting on the parallel rod cable 5 can be transmitted to the fixed centering piece 9, which not only reduces the overall slip amount of the parallel rod cable 5, but also makes the slip amounts of all parallel rod cables 5 consistent, thereby reducing the influence of the bundling effect on the anchoring efficiency. When the adhesive filler 11 is injected into the steel anchor cylinder 8, on the one hand, the filling sequence is to preferentially close the holes in the tail part, and then inject the holes in the middle part, so that the adhesive filler 11 can fully fill the empty areas in the steel anchor cylinder 8; on the other hand, by adjusting the content of the high-efficiency expanding agent in the adhesive filler 11 to be stepped, the expansion and extrusion force generated by the adhesive filler 11 gradually increases from the loading end of the anchor to the free end, thereby avoiding local shear failure of the loading end of the anchor due to stress concentration. The thermoplastic resin composite parallel rod cable forming device, anchoring system and method disclosed by the application heats the parallel rod cable 5 in the spiral track groove 12 through the heating column 2 and the hot air gun arranged inside the spiral bending forming device, thereby ensuring the stability of the heating of the parallel rod cable 5 and the reliability after bending.

[0062] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the application. It should be understood that the above-described embodiments are only specific embodiments of the application and are not intended to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. A thermoplastic resin based composite parallel rod cable variable stiffness anchoring system characterized by: The steel anchor cylinder (8) is provided with three glue injection holes (10).

2. The thermoplastic resin based composite parallel rod cable variable stiffness anchoring system of claim 1, wherein: The spiral centering piece (7) and the steel anchor cylinder (8) are connected through threads and the spiral centering piece (7) is fixed through a plurality of bolts (6).

3. The thermoplastic resin based composite parallel rod cable variable stiffness anchoring system of claim 1, wherein: The thickness of the steel anchor cylinder (8) gradually decreases from one end where the spiral centering piece (7) is arranged to the other end where the fixed centering piece (9) is arranged.

4. The thermoplastic resin based composite parallel rod cable variable stiffness anchoring system of claim 1, wherein: The components of the adhesive filler (11) include epoxy resin, iron sand and high-efficiency expanding agent, and the rigidity of the adhesive filler (11) is adjusted according to the amount of the high-efficiency expanding agent.

5. The thermoplastic resin based composite parallel rod cable variable stiffness anchoring system of claim 1, wherein: The method comprises the following steps:

6. A method of anchoring using the thermoplastic resin matrix composite parallel rod cable variable stiffness anchoring system of claim 2, characterized by: S1, the parallel rod cable (5) is sequentially threaded through the spiral centering piece (7), the steel anchor cylinder (8) and the fixed centering piece (9); S2, the fixed centering piece (9) and the steel anchor cylinder (8) are threadedly fixed, the parallel rod cable (5) is fixed with the fixed centering piece (9), and the spiral centering piece (7) is screwed into the steel anchor cylinder (8) to apply a torsion to the parallel rod cable (5) and then fixed; S3, the whole anchoring system is placed into a high-temperature oven for softening; S4, the adhesive filler (11) with different rigidities is injected into the steel anchor cylinder (8) through the glue injection holes (10) at different positions on the steel anchor cylinder (8). ​

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