A FRP / steel composite restrained UHPC anchor plate and preparation method thereof

Abstract

An FRP / steel composite restrained UHPC anchor plate and a preparation method thereof, relate to the field of porous anchor plates for prestressed concrete structures. The present invention aims to solve the technical problem that the existing anchors are heavy and require durable protection. In this embodiment, an FRP / steel composite restrained UHPC porous anchor plate is provided, which uses a fiber reinforced resin-based composite material (FRP) with high strength and durability as a restraining material, a frustum-shaped steel pipe as a composite restraining material, and an ultra-high performance concrete (UHPC) material as a local pressure bearing material. It is a new type of anchor plate device with light weight, high strength and durability characteristics used in general prestressed concrete structure engineering.

Description

Technical Field

[0001] The invention relates to the field of porous anchor plates for prestressed concrete structures, and in particular to an FRP / steel composite constrained UHPC anchor plate and a preparation method thereof. Background Art

[0002] Prestressed steel porous anchor plates have been widely used in civil engineering. They are generally made of structural steel. Porous anchors are generally large in size, heavy in weight, and high in cost. The convenience of on-site transportation needs to be improved. In addition, in harsh environments, steel components need to be protected and sealed. Generally, the prestressed anchor ends are sealed to seal concrete cracks. The long-term performance degradation of steel structure anchors will affect the end anchorage of prestressed components and the overall service life of the structure and even the structural safety. In particular, with the development of the application of offshore engineering infrastructure structures, it is necessary to develop new anchoring devices with lightweight, high strength and durability, which is of great significance for reducing the weight of engineering structures and optimizing the long-term performance design of structures. Summary of the invention

[0003] The present invention aims to solve the technical problem that the existing anchors are heavy and unfavorable for application in offshore engineering infrastructure structures, and further provides an FRP / steel composite restrained UHPC anchor plate and a preparation method thereof;

[0004] An FRP / steel composite constrained UHPC porous anchor plate, the porous anchor plate comprising a UHPC body, an outer FRP constrained tube, a constrained steel tube, and N constrained protective clamp bodies, where N is a positive integer;

[0005] The UHPC body, the outer FRP constraint tube and the constraint steel tube are coaxially arranged, the UHPC body is a truncated cone structure, one end of the UHPC body is evenly processed with an anchor plate anchor hole, the outer FRP constraint tube and the constraint steel tube are both truncated cone-shaped, the outer FRP constraint tube is sleeved on the outside of the UHPC body, and the outer FRP constraint tube is arranged in affixed relation with the outer circumferential surface of the UHPC body, the constraint steel tube is inserted into the UHPC body from the small end of the UHPC body along the axial direction of the UHPC body, and the small end of the constraint steel tube is arranged on the same side as the small end of the UHPC body, and the large end of the constraint steel tube is arranged on the same side as the large end of the UHPC body, and each constraint protection clip is specifically installed in an anchor plate anchor hole;

[0006] Furthermore, the anchor plate anchor hole is a tapered hole, the large end of the anchor plate anchor hole is arranged on the large end of the UHPC body, and the small end of the anchor plate anchor hole is arranged on the small end of the UHPC body;

[0007] Furthermore, the restraining protection clamp specifically includes a restraining spiral steel bar, a protection cone tube and an anchor clip, the restraining spiral steel bar, the protection cone tube and the anchor clip are sequentially arranged from the outside to the inside, and the protection cone tube is arranged in coordination with the anchor hole of the anchor plate;

[0008] Furthermore, the taper of the protective cone tube is consistent with the taper of the anchor clip;

[0009] A method for preparing an FRP / steel composite constrained UHPC porous anchor plate is achieved by the following steps:

[0010] Step 1: Fix the restraining steel pipe on the bottom mold, and the outer FRP restraining pipe is coaxially arranged outside the restraining steel pipe;

[0011] Step 2: evenly arrange multiple protective cone tubes inside the restraining steel tube set in step 1 according to the pre-designed position, and fix each protective cone tube on the bottom mold;

[0012] Step 3: Coaxially arrange a spiral restraint stirrup outside each protective cone tube set in step 2;

[0013] Step 4: pouring UHPC material on the inner side of the outer FRP restraint pipe and the inner and outer sides of the restraint steel pipe set in step 3;

[0014] Step 5: After the UHPC material is poured in step 4, the bottom mold is removed and naturally cured to obtain the FRP / steel composite constrained UHPC porous anchor plate;

[0015] Furthermore, in the step 1, the wall thickness of the restraining steel pipe is 3-10 mm, and the material is Q345-460 strength steel;

[0016] Furthermore, the outer FRP restraint tube in step 1 is one of aramid fiber reinforced resin-based composite material (AFRP), basalt fiber reinforced resin-based composite material (BFRP), carbon fiber reinforced resin-based composite material (CFRP) and glass fiber reinforced resin-based composite material (GFRP);

[0017] Furthermore, in the step 1, the gap between the constrained steel pipe and the outer FRP constrained pipe is 10 mm to 30 mm;

[0018] Furthermore, the compressive strength grade of the anchor plate after being cast with the UHPC material in step 4 is not less than UHC120, and the tensile strength grade is not less than UHT10;

[0019] Furthermore, in the step 5, after the bottom mold is removed, the product is naturally cured and formed, and the natural curing time at room temperature is 28 days.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention provides an FRP / steel composite constrained UHPC porous anchor plate and a preparation method. The FRP / steel composite constraint effect can effectively constrain the lateral deformation of UHPC, put UHPC in a three-way compressive state, improve the local compressive performance of UHPC, control the formation of local compression cracks, and thus improve the stress performance of the anchor plate.

[0022] 2. The present invention provides a FRP / steel composite constrained UHPC porous anchor plate and preparation method, which gives full play to the advantages of the two materials through the composite constraint of FRP and steel. FRP materials have high tensile strength but low stiffness; steel has high strength and greater stiffness than FRP. The composite constraint design of steel plate casing and FRP pipe can not only give play to the tensile strength advantages of the two, but also make up for the low stiffness of FRP, and can better constrain the core area UHPC, limit the development of cracks, and improve the local compressive strength and deformation capacity of UHPC.

[0023] 3. The present invention provides an FRP / steel composite constrained UHPC porous anchor plate and a preparation method, which uses UHPC as the main pressure-bearing material of the anchor plate, and its density is 25kN / m 3 , which is about 1 / 3 of that of steel. Therefore, the self-weight of the composite anchor plate is about 1 / 3 of that of the steel anchor plate. The reduction in self-weight is beneficial to high-altitude construction and on-site handling operations.

[0024] 4. The FRP / steel composite constrained UHPC porous anchor plate and preparation method provided by the present invention utilize the strong resistance of FRP materials to medium erosion. Even if cracks appear in the general prestressed anchor plugging and corrosive media in the air enter, it will not affect the long-term performance of the composite anchor plate. Traditional steel anchor plates must take corresponding protective measures, and if the protective layer fails, they will face the problem of long-term performance degradation.

[0025] 5. The FRP / steel composite constrained UHPC porous anchor plate and preparation method provided by the present invention adopts FRP pipe as a permanent template for casting UHPC, which reduces the use of templates in anchor plate production and greatly saves the manufacturing cost of anchor plate production.

[0026] 6. The present invention provides an FRP / steel composite constrained UHPC porous anchor plate and a preparation method. The anchor plate is made into a cone shape instead of the existing cylindrical shape. First of all, the problem of local pressure on the UHPC in the anchor plate is considered. The cone shape can effectively limit the cracks caused by local pressure on the UHPC in the anchor plate, which is similar to the role of indirect reinforcement under local pressure on ordinary concrete. By changing the shape of the anchor plate, the reserved stop holes at the anchor plate can be made according to the size of the bottom surface of the anchor plate, which effectively reduces the adverse effect of the anchor plate opening on the local pressure on the concrete below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural exploded diagram of the anchor plate described in the present invention;

[0028] Figure 2 It is a structural schematic diagram of the anchor plate described in the present invention;

[0029] Figure 3 is a side sectional view of the structure of the anchor plate of the present invention;

[0030] Figure 4 It is a schematic diagram of the arrangement of the anchor plate in use of the present invention;

[0031] In the figure, 1 is UHPC body, 2 is outer layer FRP restraining pipe, 3 is restraining steel pipe, 4 is restraining spiral steel bar, 5 is protective cone pipe, 6 is anchor clip, 7 is preloaded steel bar, 8 is steel bar holding pipe, 9 is casting hole, 10 is anchor plate anchor hole and 11 is UHPC protective layer. DETAILED DESCRIPTION

[0032] Specific implementation method 1: refer to Figures 1 to 4 This embodiment is described. This embodiment provides an FRP / steel composite constrained UHPC porous anchor plate, the porous anchor plate comprising a UHPC body 1, an outer FRP constrained tube 2, a constrained steel tube 3, and N constrained protective clamp bodies, where N is a positive integer;

[0033] The UHPC body 1, the outer FRP constraint tube 2 and the constraint steel tube 3 are coaxially arranged, the UHPC body 1 is a truncated cone structure, one end of the UHPC body 1 is evenly processed with an anchor plate anchor hole 10, the outer FRP constraint tube 2 and the constraint steel tube 3 are both truncated cone-shaped, the outer FRP constraint tube 2 is sleeved on the outside of the UHPC body 1, and the outer FRP constraint tube 2 is arranged in contact with the outer circular surface of the UHPC body 1, the constraint steel tube 3 is inserted into the UHPC body 1 from the small end of the UHPC body 1 along the axial direction of the UHPC body 1, and the small end of the constraint steel tube 3 is arranged on the same side as the small end of the UHPC body 1, and the large end of the constraint steel tube 3 is arranged on the same side as the large end of the UHPC body 1, and each constraint protection clip is specifically installed in an anchor plate anchor hole 10.

[0034] In this embodiment, a FRP / steel composite restrained UHPC porous anchor plate is provided, which uses the high strength and durability of fiber reinforced resin-based composite materials (FRP) as a restraining material, a frustum-shaped steel pipe as a composite restraining material, and an ultra-high performance concrete (UHPC) material as a local pressure bearing material. It is a new type of anchor plate device with light weight, high strength and durability characteristics used in general prestressed concrete structure engineering;

[0035] The present invention combines the current status of prestressed anchor plates at home and abroad, and starts from the perspective of anchor plate structural composition design and material optimization selection, improves the shortcomings of traditional steel anchor plates in terms of self-weight, high cost, and durability protection, and develops a new type of anchor plate construction technology with light weight, high strength, relative durability, and economic characteristics. The anchor plate is suitable for prestressed anchor system of general prestressed concrete structures and marine engineering concrete structures, which can significantly reduce self-weight and production costs, and improve the durability of the anchor plate in the case of plugging cracks.

[0036] The present invention provides an FRP / steel composite restraint UHPC anchor plate, which belongs to a clip-type anchor plate, comprising a plate body and an anchor hole arranged in the middle of the plate body, the plate body is in a truncated cone shape, and the anchor hole is reserved by a protective cone tube at a certain angle; the FRP / steel composite restraint is composed of three materials, firstly, a fiber reinforced composite material (FRP) is wound outside a forming mold according to an FRP wet winding process to form an FRP restraint pipe, and then a steel plate sleeve is placed inside, the two are kept concentrically in place, and then a conical steel pipe is fixed in place, and finally ultra-high performance concrete (UHPC) is poured, wherein the steel sleeve and the FRP pipe directly provide UHPC lateral restraint stress under local pressure, and serve as a permanent lateral formwork for the poured UHPC.

[0037] The outer layer uses FRP restraint pipes, which fully utilizes FRP's ability to resist medium erosion and enhances the durability of the anchor plate. At the same time, the composite reinforced internal steel plate casing has a restraining effect on the ultra-high performance concrete, forming a composite restraint system with the restraining steel pipe that bears common force.

[0038] The material strength grade of the restraining steel pipe and FRP restraining pipe shall be selected according to the relevant national standards and specifications and determined by the anchor plate product design calculation. The composite restraint system of FRP pipe and internal restraining steel pipe provides the core UHPC with local pressure bearing capacity and deformation capacity, and also serves as the permanent outer formwork of the post-cast core UHPC;

[0039] The restraining steel pipe 3 and the outer FRP restraining pipe 2 are concentric and truncated cone cylindrical structural components with the same slope.

[0040] Specific implementation method 2: refer to Figures 1 to 4 This embodiment is described. This embodiment further defines the anchor plate anchor hole 10 described in the first embodiment. In this embodiment, the anchor plate anchor hole 10 is a tapered hole. The large end of the anchor plate anchor hole 10 is arranged on the large end of the UHPC body 1, and the small end of the anchor plate anchor hole 10 is arranged on the small end of the UHPC body 1. Other components and connection methods are the same as those in the first embodiment.

[0041] Specific implementation method three: refer to Figures 1 to 4This embodiment is described. This embodiment further limits the restraint protection clamp described in the second embodiment. In this embodiment, the restraint protection clamp specifically includes a restraint spiral steel bar 4, a protection cone tube 5 and an anchor clip 6. The restraint spiral steel bar 4, the protection cone tube 5 and the anchor clip 6 are sequentially arranged from the outside to the inside, and the protection cone tube 5 is arranged in coordination with the anchor plate anchor hole 10. Other components and connection methods are the same as those in the first embodiment.

[0042] In this embodiment, the protective cone tube 5 has spiral restraint stirrups 4 outside, and the protective cone tube 5 provides surface reinforcement and extrusion protection for the anchor hole. The taper of the protective cone tube 5 is consistent with the relevant parameters of the clip selected in the design. After the curing is completed, the protective cone tube 5 participates in the work of the anchor plate to match the clip. The protective cone tube 5 is formed as a permanent template of the pores and as a part of the anchor plate, the protective cone tube 5 and the anchor plate become a whole.

[0043] Specific implementation method 4: refer to Figures 1 to 4 This embodiment is described as further limiting the protection cone tube 5 described in the third embodiment. In this embodiment, the taper of the protection cone tube 5 is consistent with the taper of the anchor clip 6. Other components and connection methods are the same as those of the second embodiment.

[0044] Specific implementation method five: refer to Figures 1 to 4 This embodiment is described. This embodiment provides a method for preparing an FRP / steel composite constrained UHPC porous anchor plate, and the method is achieved by the following steps:

[0045] Step 1: fix the restraining steel pipe 3 on the bottom mold, and the outer FRP restraining pipe 2 is coaxially arranged with the restraining steel pipe 3 outside the restraining steel pipe 3;

[0046] Step 2: a plurality of protective cone tubes 5 are evenly arranged inside the restraining steel tube 3 set in step 1 according to the pre-designed position, and each protective cone tube 5 is fixed on the bottom mold;

[0047] Step 3: a spiral restraint stirrup 4 is coaxially arranged outside each protective cone tube 5 set in step 2;

[0048] Step 4: pouring the UHPC material on the inner side of the outer FRP restraining pipe 2 and the inner and outer sides of the restraining steel pipe 3 set in step 3;

[0049] Step 5: After the UHPC material is poured in step 4, the bottom form is removed and naturally cured to obtain the FRP / steel composite constrained UHPC porous anchor plate.

[0050] In this embodiment, the outer layer FRP restraining tube 2 is made according to the relevant national or industry standards, using the corresponding FRP profiles and their auxiliary materials, and is prepared by a continuous winding process. The restraining steel pipe (3) is made according to the relevant national or industry standards, using the corresponding restraining steel pipe profiles, and is processed and manufactured according to the corresponding design dimensions.

[0051] The selection of raw materials and their proportion design of UHPC shall comply with the provisions of "Ultra-High Performance Concrete Premix" (T / CBMF96-2020 / T / CCPA20-2020) and "Ultra-High Performance Concrete Basic Properties and Test Methods" (T / CBMF 37; T / CCPA 7) on materials, and the compressive strength grade shall not be lower than UHC120. In the process of pouring UHPC, the protective cone tube (5) is used to reserve anchor holes, and at the same time plays a protective role in the pores for reinforcing bars. The protective cone tube 5 has spiral restrained stirrups 4 outside, and the protective cone tube 5 provides surface reinforcing bars and extrusion protection for the anchor holes. The taper of the protective cone tube 5 is consistent with the relevant parameters of the clip selected in the design. After curing, the protective cone tube 5 participates in the work of the anchor plate and is used to match the clip. The protective cone tube 5 is formed as a permanent template for the pores and as a part of the anchor plate, the protective cone tube 5 and the anchor plate become a whole. The number of anchor holes is determined according to design requirements, and the arrangement of anchor holes is carried out in accordance with the current national standard "Anchors, clamps and connectors for prestressed tendons" (GB / T14370);

[0052] Ultra-high Performance Concrete (UHPC) refers to a fiber-reinforced cement-based composite material with ultra-high impermeability and mechanical properties. It has ultra-high mechanical properties and excellent durability, and the brittle characteristics of the material are improved after fiber modification. The present invention uses FRP / steel constrained UHPC porous anchor plates to further improve the brittleness problem of UHPC from the perspective of structural constraint theory, and FRP (fiber-reinforced composite material) and UHPC (ultra-high performance concrete) have good corrosion resistance. The use of these two materials can effectively improve the problems of heavy weight, high cost, and durability protection of traditional steel prestressed anchor plates;

[0053] In step five of the method, after casting the UHPC material, the material is covered with a film and naturally cured for 24 hours, the formwork is removed, the film is covered and cured to a designed age of 28 days, thereby obtaining the FRP / steel composite constrained UHPC anchor plate.

[0054] Specific implementation method six: refer to Figures 1 to 4 This embodiment is described as further limiting step 1 described in the fifth embodiment. In this embodiment, the wall thickness of the restraining steel pipe 3 in step 1 is 3-10 mm, and the material is Q345-460 strength steel. Other components and connection methods are the same as those in the fourth embodiment.

[0055] Specific implementation method seven: refer to Figures 1 to 4 This embodiment is described. This embodiment further limits step 1 described in specific embodiment 6. In this embodiment, the outer layer FRP restraint tube 2 in step 1 is one of aramid fiber reinforced resin-based composite material (AFRP), basalt fiber reinforced resin-based composite material (BFRP), carbon fiber reinforced resin-based composite material (CFRP) and glass fiber reinforced resin-based composite material (GFRP). Other components and connection methods are the same as those in specific embodiment 4.

[0056] Specific implementation method eight: refer to Figures 1 to 4 This embodiment is described as further limiting step 1 described in the fourth embodiment. In this embodiment, the gap between the restraining steel pipe 3 and the outer FRP restraining pipe 2 in step 1 is 10 mm to 30 mm. Other components and connection methods are the same as those in the fourth embodiment.

[0057] Specific implementation method nine: refer to Figures 1 to 4 This embodiment is described. This embodiment further limits step 4 described in the specific embodiment 4. In this embodiment, the compressive strength grade of the anchor plate after being cast with UHPC material in step 4 is not less than UHC120, and the tensile grade is not less than UHT10. Other components and connection methods are the same as those in the specific embodiment 4.

[0058] Specific implementation method ten: refer to Figures 1 to 4 This embodiment is described as further limiting step 5 described in the fourth embodiment. In this embodiment, the bottom mold is removed in step 5 and then naturally cured for 28 days at room temperature. Other components and connection methods are the same as those in the fourth embodiment.

[0059] The present invention has been disclosed as above with preferred implementation cases, but it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0060] Example 1

[0061] This embodiment takes a nine-hole anchor plate as an example.

[0062] The present embodiment provides an FRP / steel composite constrained UHPC anchor plate, the anchor plate comprising a UHPC body 1, a protective layer 11, a constrained steel pipe 3, an outer FRP constrained pipe 2 and a protective cone pipe 5; wherein the constrained steel pipe 3 is a frustum, the outer side of the constrained steel pipe 3 is the protective layer 11, the outer side of the protective layer 11 is the outer FRP constrained pipe 2, the constrained steel pipe 3 and the outer FRP constrained pipe 2 form an FRP / steel composite constrained system; the UHPC body 1 is cast on the inner side of the FRP constrained pipe 2 and the inner side of the constrained steel pipe 3, and 9 protective cone pipes 5 and their constrained spiral stirrups 4 are arranged inside the UHPC body 1, and anchor holes 10 are formed through the pipe body of the protective cone pipe 5.

[0063] The restraining steel pipe 3 and the outer layer FRP restraining pipe 2 are concentric, coaxial and have the same slope as the frustum-shaped structure.

[0064] The taper of the protective cone tube 5 is consistent with the parameters of the selected anchor clip 6.

[0065] The method for preparing the FRP / steel composite constrained UHPC anchor plate is specifically carried out according to the following steps:

[0066] First, a truncated cone-shaped restrained steel pipe 3 with a taper of 30 degrees is prepared by welding process; a FRP cloth coated with impregnated glue is stretched and attached to the FRP pipe forming mold on a special forming machine tool by wet winding technology to form an outer layer FRP restrained pipe 2;

[0067] Step 1: fix the restraining steel pipe 3 on the bottom mold, and the outer FRP restraining pipe 2 is coaxially arranged with the restraining steel pipe 3 outside the restraining steel pipe 3;

[0068] Step 2: 9 protective cone tubes 5 are evenly arranged inside the restraining steel tube 3 set in step 1 according to the pre-designed position, and each protective cone tube 5 is fixed on the bottom mold;

[0069] Step 3: a spiral restraint stirrup 4 is coaxially arranged outside each protective cone tube 5 set in step 2;

[0070] Step 4: pouring the UHPC material on the inner side of the outer FRP restraining pipe 2 and the inner and outer sides of the restraining steel pipe 3 set in step 3;

[0071] Step 5: After the UHPC material is poured in step 4, the mold is removed after natural static curing for 24 hours, and then the material is coated and cured at room temperature for 28 days to reach the design strength, thereby obtaining the FRP / steel composite constrained UHPC anchor plate.

[0072] Wherein: the wall thickness of the restraining steel pipe 3 in step 1 is 3 mm, the material is Q345 high-strength steel, the FRP cloth is CFRP, and the height of the FRP cloth pipe is 10 mm higher than the height of the built-in steel plate casing 2; the basic performance of the UHPC in step 4 shall comply with the "Ultra-High Performance Concrete Premix" (T / CBMF96-2020 / T / CCPA20-2020) and "Basic Performance and Test Methods of Ultra-High Performance Concrete" (T / CBMF 37-2018; T / CCPA 7-2018), and the compressive strength grade is not less than UHC120. During the pouring described in step 4, UHPC is poured into the inner side of the FRP pipe and the inner side of the constrained steel pipe 3 (outside of each protective cone tube 5), and the spiral constrained stirrups 4 are inserted. Then, the steel is fully vibrated, and the mold is removed after being stopped and naturally cured for 24 hours. After demolding, the steel is coated and cured at room temperature for 28 days to the design strength. The protective cone tube 5 described in step 4 is a galvanized thin-walled steel tube. The protective cone tube 5 is at the same height as the main part of the anchor plate UHPC, and the taper is consistent with the parameters of the selected anchor clip 6.

Claims

1. A FRP / steel composite restrained UHPC porous anchor plate, characterized in that: The porous anchor plate comprises a UHPC body (1), an outer FRP constraint tube (2), a constraint steel tube (3), and N constraint protection clamp bodies, where N is a positive integer; The UHPC body (1), the outer FRP constraint tube (2) and the constraint steel tube (3) are coaxially arranged, the UHPC body (1) is a truncated cone structure, one end of the UHPC body (1) is evenly processed with N anchor plate anchor holes (10), the outer FRP constraint tube (2) and the constraint steel tube (3) are both truncated cone-shaped, the outer FRP constraint tube (2) is sleeved on the outside of the UHPC body (1), and the outer FRP constraint tube (2) is arranged to fit the outer cylindrical surface of the UHPC body (1), the constraint steel tube (3) is inserted into the UHPC body (1) from the small end of the UHPC body (1) along the axial direction of the UHPC body (1), and the small end of the constraint steel tube (3) is arranged on the same side as the small end of the UHPC body (1), and the large end of the constraint steel tube (3) is arranged on the same side as the large end of the UHPC body (1), and each constraint protection clip is specifically installed in an anchor plate anchor hole (10); The anchor plate anchor hole (10) is a tapered hole, the large end of the anchor plate anchor hole (10) is arranged on the large end of the UHPC body (1), and the small end of the anchor plate anchor hole (10) is arranged on the small end of the UHPC body (1); The restraining protection clamp specifically comprises a restraining spiral steel bar (4), a protection cone tube (5) and an anchor clip (6), wherein the restraining spiral steel bar (4), the protection cone tube (5) and the anchor clip (6) are sequentially arranged from the outside to the inside, and the protection cone tube (5) is arranged in coordination with the anchor hole (10) of the anchor plate.

2. According to the FRP / steel composite restrained UHPC porous anchor plate as described in claim 1, it is characterized by: The taper of the protective cone tube (5) is consistent with the taper of the anchor clip (6).

3. A method for preparing any one of the FRP / steel composite restrained UHPC porous anchor plates as described in claims 1 to 2, characterized in that: The method is achieved by the following steps: Step 1: fix the restraining steel pipe (3) on the bottom mold, and the outer FRP restraining pipe (2) and the restraining steel pipe (3) are coaxially arranged outside the restraining steel pipe (3); Step 2: evenly arranging a plurality of protective cone tubes (5) inside the restraining steel tube (3) set in step 1 according to the pre-designed position, and fixing each protective cone tube (5) on the bottom mold; Step 3: a constrained spiral steel bar (4) is coaxially arranged outside each protective cone tube (5) set in step 2; Step 4: pouring the UHPC material on the inner side of the outer FRP restraining pipe (2) and the inner and outer sides of the restraining steel pipe (3) set in step 3; Step 5: After the UHPC material is poured in step 4, the bottom form is removed and naturally cured to obtain the FRP / steel composite constrained UHPC porous anchor plate.

4. The method for preparing a FRP / steel composite constrained UHPC porous anchor plate according to claim 3, characterized in that: In the step 1, the wall thickness of the restraining steel pipe (3) is 3-10 mm, and the material is Q345-460 high-strength steel.

5. The method for preparing a FRP / steel composite constrained UHPC porous anchor plate according to claim 4, characterized in that: The outer FRP restraint tube (2) in step 1 is one of aramid fiber reinforced resin-based composite material (AFRP), basalt fiber reinforced resin-based composite material (BFRP), carbon fiber reinforced resin-based composite material (CFRP) and glass fiber reinforced resin-based composite material (GFRP).

6. The method for preparing a FRP / steel composite constrained UHPC porous anchor plate according to claim 5, characterized in that: In the step 1, the gap between the constraining steel pipe (3) and the outer FRP constraining pipe (2) is 10 mm to 30 mm.

7. The method for preparing a FRP / steel composite constrained UHPC porous anchor plate according to claim 6, characterized in that: The compressive strength grade of the anchor plate cast with UHPC material in step 4 is not less than UHC120, and the tensile strength grade is not less than UHT10.

8. The method for preparing a FRP / steel composite constrained UHPC porous anchor plate according to claim 7, characterized in that: After the bottom mold is removed in step 5, the product is naturally cured and formed, and the natural curing time at room temperature is 28 days.

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