A site forming device and forming method for expanding the anchoring end of FRP tendon

Abstract

This invention discloses an on-site molding device and method for expanding the anchorage end of FRP (Fiberglass Reinforced Plastic) bars, belonging to the field of building engineering technology. The molding device includes a mold with a hot-melt cavity inside. The inner wall of the hot-melt cavity is provided with several inner cavity ribs and a heater. The upper part of the mold has an injection channel communicating with the hot-melt cavity, and the lower part has a resin extraction channel communicating with the hot-melt cavity. The outlet of the resin extraction channel is connected to a self-priming booster pump. This invention enables FRP bars to achieve the necessary anchorage effect without bending, laying the foundation for the widespread application of FRP bars.

Description

Technical Field

[0001] This invention belongs to the field of building engineering technology, specifically relating to an on-site forming device and method for expanding the anchorage end of FRP bars. Background Technology

[0002] In traditional reinforced concrete structures, the poor corrosion resistance of steel bars leads to reduced structural durability. Fiber-reinforced polymer (FRP) bars are fiber-reinforced composite materials composed of multiple continuous fibers and matrix materials, finally extruded using a special mold. The emergence of FRP bars effectively solves the problem of steel bar corrosion. In addition to strong corrosion resistance, FRP bars also have advantages such as lightweight, high strength, and high design flexibility, showing promise for large-scale industrial application.

[0003] Due to the brittle fracture nature of FRP bars, they cannot be bent like steel bars, while the bent section of steel bars is a general structural feature required for effective anchorage in concrete. The traditional method of anchoring FRP bars involves inserting them into the joint. However, because FRP bars cannot be bent, slippage easily occurs with the concrete during actual anchorage. This method results in poor anchorage effectiveness and poor controllability. Therefore, more effective anchorage methods are needed for FRP bars. Summary of the Invention

[0004] This invention provides an on-site forming device and method for expanding the anchorage end of FRP bars, which enables FRP bars to achieve the necessary anchorage effect to exert their strength without bending, laying the foundation for the widespread application of FRP bars.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A field molding device for expanding the anchorage end of FRP reinforcement includes a mold, wherein a hot melt cavity is provided inside the mold, and the inner wall of the hot melt cavity is provided with a plurality of inner cavity ribs and a heater; the upper part of the mold has an injection channel communicating with the hot melt cavity, and the lower part has a resin extraction channel communicating with the hot melt cavity, wherein the outlet of the resin extraction channel is connected to a self-priming booster pump.

[0007] Furthermore, it also includes a fiber dispersion device, which comprises umbrella ribs, springs, diagonal braces, sliders, umbrella canopy frames, and cards; the umbrella canopy frame is a mesh structure, one end of the diagonal brace is connected to the slider, and the other end is hinged to the umbrella canopy frame, one end of the spring is fixedly connected to the umbrella ribs, and the other end is in contact with the first end of the slider in the initial state; in the initial state, the card is located at the second end of the slider, the upper part of the card passes through the umbrella canopy frame, so that the spring is in a compressed state, the slider is in a stationary state under the constraint of the card, and the upper end of the card is connected to the card cable, which extends out of the mold.

[0008] Furthermore, an FRP rib clip adjustment groove is provided at the inlet end of the hot melt cavity, and an FRP rib clip is provided in the FRP rib clip adjustment groove. The FRP rib clip is controlled by a miniature electric push rod, and the extension length of the FRP rib clip is adjusted by the clip adjustment switch.

[0009] Furthermore, the inner wall of the hot melt cavity outlet end is provided with two shearing blades, the extension length of which is adjustable.

[0010] Furthermore, a temperature sensor is installed in the hot melt cavity, and the temperature sensor is connected to the control terminal.

[0011] Furthermore, a ribbed piston is provided in the inner cavity ribbed groove, and the groove wall of the inner cavity ribbed groove is provided with multiple slots. The position of the ribbed piston is fixed by the slots on the inner cavity ribbed groove wall.

[0012] Furthermore, a pressure sensor is provided at the outlet end of the hot melt cavity, and the pressure sensor is connected to the control terminal.

[0013] Furthermore, the hot-melt cavity is frustum-shaped.

[0014] Furthermore, the mold includes an upper mold and a lower mold that are mated together, and the upper mold and the lower mold are connected by fasteners.

[0015] A method for on-site forming of an enlarged anchorage end of an FRP rebar, comprising the following steps:

[0016] S1. Place the FRP rib into the mold, so that the FRP rib passes through the inner cavity of the through end and protrudes 1-3cm out of the mold. Adjust each rib groove piston to the predetermined position and close the clamp to make the mold a whole.

[0017] S2. Turn on the heater and monitor the temperature in the hot melt chamber. When the FRP resin in the hot melt chamber melts, turn on the vacuum port switch and turn on the self-priming booster pump to suck the heated and melted resin into the vacuum bag. After complete absorption, turn off the vacuum port switch.

[0018] S3. Insert the fiber dispersion device in the hot melt cavity into the hot melted fiber bundle using a micro electric winch. Cut off the part of the FRP bar that extends out of the inner cavity using a shearing blade, and at the same time, close the inner cavity of the outgoing end using the shearing blade. Open the umbrella frame of the fiber dispersion device and disperse the fibers in the FRP bar circumferentially on the inner wall of the hot melt cavity. Inject glue into the hot melt cavity through the glue injection channel. After the glue fills the hot melt cavity, close the glue injection channel.

[0019] S4. After the glue injected into the hot melt cavity has solidified, the mold is removed to obtain the FRP bar with the enlarged end head after hot melt reshaping.

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

[0021] The device disclosed in this patent can enlarge and modify the shape of the FRP bar ends according to actual anchoring requirements on the construction site. By reshaping the FRP bar ends through heat melting, the ends are made into a frustum shape, increasing the contact area between the FRP bar ends and the concrete structure. This expands the anchoring bond interface of the FRP bar in the concrete. At the same time, the ribs at the ends of the FRP bar can increase the interlocking force between the FRP bar and the concrete structure, enhancing mechanical anchoring. This solves the key structural problems in the widespread application of FRP bars in concrete structures and is characterized by simplicity, convenience, and high efficiency.

[0022] Furthermore, the inner cavity is equipped with multiple adjustable-depth rib grooves, allowing the rib groove height to be adjusted according to the actual project during re-insertion. The rib height at the end of the reformed FRP reinforcement can be adjusted according to different anchoring requirements, thereby creating enlarged ports with varying rib heights.

[0023] Furthermore, an FRP rib buckle adjustment switch is provided at the near end of the device, which can control the extension and retraction of the FRP rib buckle in the near end hot melt cavity, thereby positioning and fixing FRP ribs of different diameters and preventing the FRP ribs from slipping during operation.

[0024] Furthermore, the mold is divided into upper and lower parts. When in use, the mold is closed and fastened. After the glue has solidified, the clips on the mold are opened to demold.

[0025] Furthermore, a heating resistance wire and a temperature sensor are attached to the surface of the hot melt cavity of the mold, which mainly serve two purposes: on the one hand, the heating resistance wire can melt the resin in the FRP rib at high temperature; on the other hand, after the resin is injected to form an enlarged end, it can regulate the temperature in the hot melt cavity to maintain the temperature at the optimal temperature for resin solidification, so that the resin in the hot melt cavity can solidify better.

[0026] This invention provides another method for enlarging and modifying the ends of FRP bars. By reshaping the ends of the FRP bars, the contact area between the FRP bars and concrete is increased. Simultaneously, ribs are added at the ends to further enhance the mechanical anchorage strength of the FRP bars. This allows the FRP bars to achieve anchorage without bending. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structural device of this patent;

[0028] Figure 2 This is a 1-1 cross-sectional structural diagram of the pre-heat melting device of this patent;

[0029] Figure 3 This is a 2-2 cross-sectional structural diagram of the pre-heat melting device of this patent;

[0030] Figure 4a This is a schematic diagram of the fiber dispersion device of this patent before it is opened;

[0031] Figure 4b This is a schematic diagram of the fiber dispersion device of this patent when it is open;

[0032] Figure 4c This is a schematic diagram of the umbrella surface of the fiber dispersion device of this patent;

[0033] Figure 5 This is a schematic diagram of the remote control of this patent;

[0034] Figure 6 This is a schematic diagram of the FRP reinforcement after the anchorage ends have been enlarged;

[0035] Figure 7 This is a schematic diagram of section 3-3 of the FRP reinforcement after the anchorage end has been enlarged.

[0036] In the diagram: 1. Mold; 2. Hot melt cavity; 3. FRP rib; 5. Injection channel sealing plug; 6. Injection channel; 7. FRP rib clip adjustment switch; 8. FRP rib clip; 9. FRP rib clip adjustment groove; 10. Rib groove piston; 11. Inner cavity rib groove; 12. Temperature sensor; 13. Heating resistance wire; 14. Pressure sensor; 151. First miniature electric push rod; 152. Second miniature electric push rod; 153. Third miniature electric push rod; 16. Fiber dispersion device; 17. Vacuum port baffle groove; 18. Vacuum port baffle; 19. Vacuum port switch; 20. Resin extraction channel; 21. Self-priming booster pump; 22. Vacuum bag; 23. Mold outer cylinder wall; 24. Outlet end inner cavity; 25. Inlet end inner cavity; 26. Fiber dispersion device hook; 27. Umbrella rib; 28. Spring; 29. ​​Diagonal brace; 30. Sliding block; 31. Umbrella frame; 32. Suspension rope; 33. Clamp; 34. Control end; 35. Miniature electric winch; 36. Card cable; 37. Card; 38. Shearing blade; 39. Fiber bundle. Detailed Implementation

[0037] To make the objectives and technical solutions of this invention clearer and easier to understand, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1

[0040] Reference Figures 1 to 5 A field forming device for expanding the anchorage end of FRP reinforcement mainly includes three parts: mold, fiber dispersion device and control end.

[0041] Reference Figure 1 The steel mold is cylindrical in appearance and has a frustum-shaped hot melt cavity 2 inside. The end with the largest cross-sectional area of ​​the hot melt cavity 2 is the far end, i.e., the exit end inner cavity 24, and the other end is the near end, i.e., the insertion end inner cavity 25. The mold is divided into an upper mold and a lower mold. Multiple clips 33 are set on the surface of the outer cylinder wall 23 of the mold. When in use, the upper mold and the lower mold are aligned and connected into a whole by the clips 33 on the outer cylinder wall 23 of the mold. After the FRP reinforcement 3 is recast, the clips 33 are removed and demolding is performed.

[0042] Reference Figure 2The inner wall of mold 1 is provided with heating resistance wires 13, temperature sensors 12, and multiple sets of inner cavity ribs 11. The heating resistance wires 13 are uniformly arranged in a ring along the inner wall of the hot melt cavity 2. The temperature sensors 12 are only arranged in section 1-1, with a total of 7 sensors, 3 in the upper layer and 4 in the lower layer, evenly distributed between adjacent inner cavity ribs. Multiple inner cavity ribs 11 are arranged circumferentially at equal intervals along the axial direction of mold 1. At the same time, the inner wall of mold 1 has glue injection channels 6 and resin extraction channels 20, which are connected to through holes. The groove walls of the inner cavity ribs 11 are provided with multiple slots. The position of the rib piston 10 is fixed by the slots on the inner cavity rib wall. Before closing the mold, the rib piston 10 is manually adjusted to the corresponding slot to adjust the rib height at the end of the FRP rib after recasting.

[0043] An FRP rib clip adjustment groove 9 is provided on the inner wall of the insertion end. A first micro electric push rod 151, model IP60, is installed in the FRP rib clip adjustment groove 9. The fixed end of the first micro electric push rod 151 is bonded to the bottom of the FRP rib clip adjustment groove 9, and the movable end is bonded to the FRP rib clip 8. According to the diameter of the FRP rib in the actual project, the extension length of the first micro electric push rod 151 is controlled by the control end 34, thereby adjusting the extension length of the FRP rib clip 8. The FRP rib clip 8 mainly serves to fix the FRP rib, prevent the FRP rib from sliding, and avoid affecting the molding quality of the enlarged end.

[0044] The resin extraction channel 20 has two opposing vacuum port baffle grooves 17 at its inlet end. A third micro electric push rod 153 is installed in one of the vacuum port baffle grooves 17. The vacuum port baffle 18 is bonded to the third micro electric push rod 153 installed in the vacuum port baffle groove 17. The extension and retraction of the third micro electric push rod 153 is controlled by the vacuum port switch 19 to adjust the position of the vacuum port baffle 18. In the initial state, the vacuum port baffle 18 seals the resin extraction channel 20. When the resin in the hot melt chamber 2 melts at high temperature, the extension of the third micro electric push rod 153 opens the vacuum port baffle 18, so that the resin extraction channel 20 is opened, facilitating the extraction of resin. After the resin is extracted, the retraction of the third micro electric push rod 153 closes the vacuum port baffle 18, so that the resin extraction channel 20 is sealed and resin is re-injected. A self-priming booster pump 21, model GP2L, is provided at the lower part of the resin extraction channel 20. One end of the self-priming booster pump 21 is connected to the resin extraction channel 20, and the other end is connected to the vacuum bag 22 to ensure that the melted resin is sucked into the vacuum bag 22 through the resin extraction channel 20.

[0045] The mold has a frustum-shaped hot-melt cavity 2 inside, and a fiber dispersing device 16 is installed in the hot-melt cavity 2. A micro electric winch 35 (model PA200) is installed on the upper part of the hot-melt cavity 2, and the winch rope 32 is connected to the fiber dispersing device hook 26 located on the fiber dispersing device 16. In the initial state, the fiber dispersing device 16 is located on the upper wall of the hot-melt cavity 2. The position of the fiber dispersing device 16 is adjusted by adjusting the raising and lowering of the micro electric winch 35. After the FRP reinforcement 3 is heated and melted in the hot-melt cavity 2, the fiber dispersing device 16 is lowered into the fiber bundle by the micro electric winch 35. During the descent, the position of the second micro electric push rod 152 is adjusted so that the second micro electric push rod 152 generates a clamping force on the unmelted part of the FRP reinforcement through the shearing blade 38, ensuring that the position of the fiber bundle does not change during the descent of the fiber dispersing device 16. After the fiber dispersing device 16 is lowered, the unmelted end of the FRP reinforcement is cut off, and the fiber bundle is dispersed by opening the fiber dispersing device 16.

[0046] Meanwhile, a small through hole is opened on the upper wall of the hot melt cavity 2. One end of the card pull cable 36 passes through the through hole and exits the mold 1. The other end of the card pull cable 36 is connected to the card 37 on the fiber dispersion device 16. By pulling the card pull cable 36 outside the mold, the card 37 is pulled out from the fiber dispersion device 16, thereby opening the fiber dispersion device 16 and dispersing the fiber bundle around the inner cavity wall.

[0047] A pressure sensor 14 is attached to the inner wall of the hot melt cavity 2 near the far end. The pressure sensor 14 is a resistive thin film pressure sensor: IMS-C04A. The detection principle is as follows: when the inner cavity of the device is filled with glue, it will squeeze the pressure sensor 14 on the inner cavity wall. The pressure sensor 14 measures the pressure value borne by the inner cavity wall and feeds it back to the control terminal 34. The control terminal 34 determines the glue injection density according to the feedback pressure value and controls the on / off state of the glue injection system according to the glue injection density.

[0048] Two second micro electric push rods 152 are provided opposite each other on the inner wall of the outlet end cavity 24. The end of the second micro electric push rod 152 is provided with a shearing blade 38. When the fiber dispersion device 16 in the hot melt cavity 2 enters the hot melted fiber bundle, the micro electric push rod 152 pushes out the shearing blade 38 to cut off the unmelted end of the FRP rib 3, open the fiber dispersion device 16, and disperse the fiber bundle onto the inner wall of the cavity. The shearing blade 38 has two functions: first, to cut off the end of the FRP rib; and second, to seal the outlet end cavity 24 of the hot melt cavity 2, which facilitates subsequent glue injection.

[0049] Figure 4 is a schematic diagram of the fiber dispersion device 16, which consists of umbrella ribs 27, springs 28, diagonal braces 29, sliders 30, umbrella frame 31, fiber dispersion device hooks 26, and cards 37. The umbrella frame 31 is made of steel wire or fiber filaments, forming a mesh structure to facilitate the flow of newly injected resin into the hot-melt chamber 2 through the mesh. The inner top of the umbrella frame 31 is hinged to one end of the umbrella ribs 27. One end of the diagonal brace 29 is connected to the slider 30, and the other end is hinged to the umbrella frame 31. One end of the spring 28 is fixedly connected to the umbrella ribs 27, and the other end contacts the slider 30 when the fiber dispersion device 16 is not activated. When the fiber dispersion device 16 is not activated, a card 37 is placed at the front end of the slider 30. The upper part of the card 37 passes through the mesh structure of the umbrella frame 31 and is fixed by the steel wire of the mesh structure, so that the spring 28 is in a compressed state. This keeps the slider 30, which is connected to the spring 28, stationary under the constraint of the card 37. The upper end of the card 37 is connected to the card pull cable 36, which passes through a small through hole in the upper wall of the hot melt cavity 2 and exits the mold 1. By pulling the card pull cable 36 outside the mold 1, the card 37 is moved upward, the spring 28 is released, and under the action of the spring 28, the slider 30 is pushed to slide along the umbrella rib 27. Then, through the action of the diagonal brace 29, the umbrella frame 31 is opened, so that the fiber bundle is dispersed.

[0050] Figure 2 This is a schematic diagram of the preheating device. In this device, the FRP reinforcement is heated and melted, and the melted resin is extracted, so that only the FRP reinforcement fibers exist in the heat-melting cavity.

[0051] Reference Figure 5 The control terminal 34 is connected to the temperature sensor 12 and the pressure sensor 14, as well as the dispensing system and the first electric push rod 151, the second electric push rod 152, and the third electric push rod 153. The control terminal 34 receives numerical information from the temperature sensor 12 and the pressure sensor 14, adjusts the temperature inside the hot melt chamber 2 based on the temperature sensor readings, and determines whether dispensing is complete based on the pressure sensor readings, thereby controlling the dispensing system to adjust the dispensing process. Simultaneously, by connecting to the first electric push rod 151, the second electric push rod 152, and the third electric push rod 153, the control terminal controls the extension and retraction of the electric push rods to meet the needs of each component.

[0052] Example 2

[0053] A method for on-site forming of an enlarged anchorage end of an FRP rebar, comprising the following steps:

[0054] S1. Open the clip 33 and place the end of the FRP rib 3 into the mold 1, so that the FRP rib 3 passes through the inner cavity 24 of the through end and protrudes 1-3cm out of the mold. At the same time, manually adjust the pistons 10 of each rib groove to the predetermined position so that the rib height of the final FRP rib end reaches the predetermined anchoring requirement. Connect the fiber dispersion device hook 26 of the fiber dispersion device 16 to the suspension rope 32. Adjust the micro electric winch 35 to raise the fiber dispersion device 16 to the upper wall of the hot melt cavity 2. Close the clip 33 to make the mold form a whole. Control the extension and retraction of the first micro electric push rod 151 through the FRP rib buckle adjustment switch 7 to control the extension of the FRP rib buckle 8, thereby fixing the FRP rib 1.

[0055] S2. Turn on the heating resistance wire 13 and monitor the temperature in the hot melt chamber 2 in real time through the temperature sensor 12. When the temperature reaches 400 degrees, keep it warm for 10-20 minutes. The FRP rib in the hot melt chamber 2 will melt. After the resin in the FRP rib melts, the vacuum port baffle 18 is opened by extending the third micro electric push rod 153, so that the resin extraction channel 20 is opened. Turn on the vacuum port switch 19 and at the same time turn on the self-priming booster pump 21 to suck out the heated and melted resin into the vacuum bag 22. After complete absorption, turn off the vacuum port switch 19.

[0056] S3. Insert the fiber dispersion device 16 in the hot melt cavity 2 into the hot melted fiber bundle through the micro electric winch 35. When the fiber dispersion device 16 is lowered to the center of the fiber bundle, the shearing blade 38 is extended by controlling the second micro electric push rod 152 to cut off the end part of the FRP bar. At the same time, the shearing blade 38 closes the hot melt cavity 2.

[0057] S4. Pull out the card cable 36, pull out the card 37, open the umbrella surface of the fiber dispersion device 16, disperse the fibers left after the FRP reinforcement melts on the inner wall, open the injection channel sealing plug 5, inject glue into the hot melt cavity 2 through the injection channel 6, observe the value of the pressure sensor 14, and determine whether the glue in the hot melt cavity 2 is full according to the reading in the pressure sensor 14. When the glue fills the hot melt cavity 2, close the injection channel 6 through the injection channel sealing plug 5.

[0058] S5. Wait for the adhesive injected into the hot melt cavity 2 to solidify. After solidification, open the clamp 33, remove the mold 1, and obtain the FRP rib with the enlarged rear end after hot melt reshaping. Figure 6 and Figure 7 As shown.

[0059] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A field forming device for expanding the anchorage end of FRP bars, characterized in that, The device includes a mold (1) and a fiber dispersion device (16). The mold (1) is provided with a hot melt cavity (2). The inner wall of the hot melt cavity (2) is provided with a plurality of inner cavity ribs (11) and a heater (13). The upper part of the mold (1) is provided with a glue injection channel (6) communicating with the hot melt cavity (2), and the lower part is provided with a resin extraction channel (20) communicating with the hot melt cavity (2). The outlet of the resin extraction channel (20) is connected to a self-priming booster pump (21). The fiber dispersing device (16) includes an umbrella rib (27), a spring (28), a diagonal brace (29), a slider (30), an umbrella frame (31), and a card (37). The umbrella frame (31) is a mesh structure. One end of the diagonal brace (29) is connected to the slider (30), and the other end is hinged to the umbrella frame (31). One end of the spring (28) is fixedly connected to the umbrella rib (27), and the other end is in contact with the first end of the slider (30) in the initial state. In the initial state, the card (37) is located at the second end of the slider (30). The upper part of the card (37) passes through the umbrella frame (31), so that the spring (28) is in a compressed state. The slider (30) is in a stationary state under the constraint of the card (37). The upper end of the card (37) is connected to the card cable (36), and the card cable (36) passes through the mold (1).

2. The field forming device for expanding the anchorage end of FRP rebar according to claim 1, characterized in that, The inlet end of the hot melt cavity (2) is provided with an FRP rib buckle adjustment groove (9), and an FRP rib buckle (8) is provided in the FRP rib buckle adjustment groove (9). The FRP rib buckle (8) is controlled by a micro electric push rod, and the extension length of the FRP rib buckle (8) is adjusted by the buckle adjustment switch (7).

3. A device for in-situ forming of an enlarged anchorage head of a FRP tendon according to claim 1, characterized in that, The inner wall of the outlet end of the hot melt cavity (2) is provided with two shearing blades (38) facing each other, and the extension length of the shearing blades (38) is adjustable.

4. The field forming device for enlarging the anchorage end of FRP tendon according to claim 1, wherein A temperature sensor (12) is provided in the hot melt cavity (2), and the temperature sensor (12) is connected to the control terminal (34).

5. The field forming device for expanding the anchorage end of FRP rebar according to claim 1, characterized in that, The inner cavity rib groove (11) is provided with a rib groove piston (10), and the groove wall of the inner cavity rib groove (11) is provided with multiple slots. The position of the rib groove piston (10) is fixed by the slots on the inner cavity rib groove wall.

6. The field forming device for expanding the anchorage end of FRP rebar according to claim 1, characterized in that, A pressure sensor (14) is provided at the outlet end of the hot melt cavity (2), and the pressure sensor (14) is connected to the control terminal (34).

7. The field forming device for expanding the anchorage end of FRP rebar according to claim 1, characterized in that, The hot melt cavity (2) is frustum-shaped.

8. The field forming device for expanding the anchorage end of FRP rebar according to claim 1, characterized in that, The mold (1) includes an upper mold and a lower mold that are mated together, and the upper mold and the lower mold are connected by fasteners.

9. A method for on-site forming of an enlarged anchorage end of an FRP rebar, characterized in that, The on-site forming device for expanding the anchorage end of FRP rebar according to claim 1 includes the following steps: S1. Place the FRP rib (3) into the mold (1) so that the FRP rib (3) passes through the inner cavity (24) of the through end and protrudes 1-3cm out of the mold. Adjust each rib groove piston (10) to the predetermined position and close the clamp to make the mold form a whole. S2. Turn on the heater and monitor the temperature in the hot melt chamber (2). When the FRP resin in the hot melt chamber (2) melts, turn on the vacuum port switch (19) and turn on the self-priming booster pump (21) to suck the heated and melted resin into the vacuum bag (22). After complete absorption, turn off the vacuum port switch (19). S3. Insert the fiber dispersion device (16) in the hot melt cavity (2) into the hot melted fiber bundle through the micro electric winch (35), cut off the part of the FRP bar that protrudes from the inner cavity (24) through the shearing blade (38), and at the same time, close the inner cavity (24) of the protruding end through the shearing blade (38); open the umbrella frame (31) of the fiber dispersion device, disperse the fibers in the FRP bar in a circular direction on the inner wall of the hot melt cavity (2), inject glue into the hot melt cavity (2) through the glue injection channel (6), and close the glue injection channel (6) after the glue fills the hot melt cavity (2). S4. After the glue injected into the hot melt cavity (2) has solidified, remove the mold (1) to obtain the FRP bar with the enlarged end head after hot melt reshaping.

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