FRP-ECC covering layer and construction method for connecting FRP-ECC covering layer with concrete member

Abstract

The invention relates to an FRP-ECC covering layer and a construction method for connecting the FRP-ECC covering layer with a concrete member, and belongs to the technical field of building structural members. The FRP-ECC covering layer is used for reinforcing the construction strength of a concrete member and comprises the concrete member, a shear connector, an FRP grating and an ECC covering layer body. Wherein the shear connector is used for connecting the concrete member and the FRP grating, and the ECC covering layer is poured around the shear connector and the FRP grating; the shear connector comprises a plug connector and a fixing piece, the plug connector is detachably connected with the fixing piece, the fixing piece is used for being connected with a reinforcing steel bar of the concrete member, and the plug connector is used for being connected with the FRP grating. The FRP-ECC covering layer can be arranged in the construction stage of the concrete member, cracks caused by concrete shrinkage and load stress are actively inhibited through the high tensile strength of the FRP grating and the high ductility of ECC, and the hysteresis of passive repair in the prior art is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of building structural components, and particularly relates to an FRP-ECC covering layer and a construction method for connecting the same with a concrete component. Background Art

[0002] Underground structural components (such as basement walls, floor slabs, column bases, etc.) are long-term in a humid or water pressure environment, and are prone to cracks due to concrete shrinkage, load stress or chemical erosion. After water seeps into the cracks, it will accelerate concrete carbonation and steel bar corrosion, resulting in a decline in the structural bearing capacity, and even causing local collapse. If not treated in time, the cracks will further expand, threatening the overall safety and durability of the building.

[0003] In the prior art, for underground structural components with existing cracks, a method of externally bonding fiber-reinforced polymer (FRP) combined with spraying engineered cementitious composite (ECC) is usually adopted for repair. The specific steps include: first, cleaning the crack area and roughening the concrete surface to enhance the adhesion; then, applying epoxy resin glue and pasting FRP cloth to utilize its high strength to improve the tensile capacity of the component; finally, spraying ECC material on the outer layer of FRP to utilize its excellent strain hardening characteristics and microcrack control ability to inhibit the further expansion of cracks. However, this method belongs to passive repair. Since the cracks have already formed, the structural performance after repair is difficult to fully recover, and the bonding interface between the FRP-ECC layer and the original concrete may become a weak link, posing a risk of peeling.

[0004] Therefore, how to provide a method for preventing cracks from occurring during the construction of components is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides an FRP-ECC covering layer and a construction method for connecting the same with a concrete component, which can be set during the construction stage of the concrete component. Through the high tensile strength of the FRP grid and the high ductility of the ECC, the cracks caused by concrete shrinkage and load stress can be actively inhibited, avoiding the lag of passive repair in the prior art.

[0006] In the first aspect, the present invention provides an FRP-ECC covering layer for strengthening the construction strength of a concrete component, including a concrete component, shear connectors, an FRP grid and an ECC covering layer; wherein, the shear connectors are used to connect the concrete component and the FRP grid, and the ECC covering layer is poured around the shear connectors and the FRP grid; the shear connectors include plug-in parts and fixing parts, the plug-in parts are detachably connected with the fixing parts, the fixing parts are used to connect the steel bars of the concrete component, and the plug-in parts are used to connect the FRP grid.

[0007] This technical solution can be set during the construction stage of concrete components. By virtue of the high tensile strength of the FRP grid and the high ductility of ECC, it can actively inhibit the generation of cracks caused by concrete shrinkage and load stress, avoiding the lag of passive repair in the prior art. Moreover, the detachable connection between the plug-in part and the fixing part enables the shear connector to be flexibly applied to the construction of concrete components in different horizontal or vertical directions.

[0008] In some embodiments, the plug-in part is provided with a plug-in rod, and the fixing part is provided with a plug-in hole at one end away from the steel bar. The plug-in rod is inserted into the plug-in hole to realize the connection between the plug-in part and the fixing part.

[0009] Through the arrangement of the plug-in rod and the plug-in hole, this technical solution forms a stable mechanical connection, effectively improving the pull-out resistance and shear resistance between the plug-in part and the fixing part.

[0010] In some embodiments, one end of the plug-in part away from the plug-in rod is provided with a groove, and the shape of the groove matches that of the FRP grid.

[0011] Through the arrangement of the groove, this technical solution realizes the precise positioning and tight fitting between the plug-in part and the FRP grid, effectively improving the connection reliability and load transfer efficiency between the two.

[0012] In some embodiments, the fixing part includes a fixing rod and a fixing groove. The fixing rod is provided with a plug-in hole, and the fixing groove is connected to the fixing rod; one end of the fixing groove away from the fixing rod is open for sleeving with the steel bar.

[0013] Through the arrangement of the fixing rod and the fixing groove, this technical solution realizes the rapid sleeving with the steel bar, simplifies the construction and installation process, and at the same time ensures the stable connection between the fixing part and the steel bar.

[0014] In some embodiments, bolt holes are provided at both ends of the opening of the fixing groove, and the fixing groove is bolt-fixed to the steel bar.

[0015] This technical solution realizes the rigid connection between the fixing groove and the steel bar through the bolt fastening method, which not only enhances the tensile and shear strength of the connection, but also facilitates construction adjustment and later maintenance.

[0016] Second, based on the above FRP-ECC covering layer, the present invention also provides a construction method for connecting the FRP-ECC covering layer with a concrete component, which is used for the construction of a horizontal concrete component. Using the above FRP-ECC covering layer, it includes the following steps: S11, connect the fixing part of the shear connector with the plug-in part, and fixedly connect the fixing part with the steel bar; S12, pour the concrete layer around the steel bar and the shear connector according to the design requirements; S13. After the concrete begins to set, connect the FRP grid to the plug-in parts. S14. Pour the ECC covering layer evenly at the shear connectors on the concrete surface and at the FRP grid according to the design requirements.

[0017] This technical solution realizes the synchronous construction of the FRP-ECC covering layer and the transverse member by pre-fixing the shear connectors and adopting the formwork-free pouring process; the connection of the FRP grid can be carried out after the concrete begins to set, and the one-time pouring and forming avoid the weak interface problem of traditional secondary pouring, shorten the construction period, and ensure the collaborative stress performance of the FRP grid and the concrete member at the same time.

[0018] In some of these embodiments, in step S11, the method of connecting the fixing part of the shear connector to the plug-in part is: inserting the plugging rod of the plug-in part into the plugging hole of the fixing part.

[0019] In a third aspect, based on the above-mentioned FRP-ECC covering layer, the present invention also provides a construction method for connecting the FRP-ECC covering layer to a concrete member, which is used for the construction of a vertical concrete member. Using the above-mentioned FRP-ECC covering layer, it includes the following steps: S21. Disassemble the fixing part of the shear connector from the plug-in part, and fixedly connect the fixing part to the steel bar. S22. Set the formwork for the vertical concrete member according to the design requirements, and pour the concrete layer around the steel bar and the fixing part. S23. After the concrete begins to set, connect the plug-in part to the fixing part. S24. Connect the FRP grid to the plug-in part. S25. Pour the ECC covering layer evenly at the shear connectors on the concrete surface and at the FRP grid according to the design requirements.

[0020] This technical solution avoids the need to open holes in the formwork at the shear connectors during the formwork construction of the vertical structure by using the connecting part and the fixing part separately, and realizes the one-time forming of the FRP-ECC system and the vertical concrete structure.

[0021] In some of these embodiments, in step S22, the pouring thickness of the concrete layer does not exceed the end of the fixing part far from the steel bar.

[0022] This technical solution avoids the concrete from entering the plugging hole by limiting the pouring thickness of the concrete, and ensures that the plugging hole part is fully exposed.

[0023] In some of these embodiments, in step S23, the method of connecting the plug-in part to the fixing part is: inserting the plugging rod of the plug-in part into the plugging hole of the fixing part.

[0024] Based on the above solution, the FRP-ECC covering layer in the embodiments of the present invention can be set during the construction stage of concrete components. Through the high tensile strength of the FRP grid and the high ductility of ECC, it can actively inhibit the generation of cracks caused by concrete shrinkage and load stress, avoiding the lag of passive repair in the prior art; by directly mechanically connecting the FRP grid with the steel bars of the concrete component through shear connectors, compared with the adhesive method of externally pasting FRP-ECC, it significantly reduces the risk of interface peeling and improves the overall collaborative stress performance; the detachable connection between the plug-in parts and the fixing parts enables the shear connectors to be flexibly applied to the construction of concrete components in different horizontal or vertical directions; the impermeability and micro-crack control ability of the ECC covering layer can block the erosion of moisture and chloride ions, delay the carbonation of concrete and the corrosion of steel bars, thereby extending the service life of underground structures. In summary, the FRP-ECC covering layer in this embodiment can effectively prevent cracks from occurring in underground structures, fundamentally solve the problem of performance degradation of underground structures caused by cracks, and take into account construction convenience and maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of the shear connector of the FRP-ECC covering layer in the embodiments of the present invention; Figure 2 is a schematic usage diagram of the shear connector of the FRP-ECC covering layer in the embodiments of the present invention; Figure 3 is a schematic construction structural diagram of the FRP-ECC covering layer for horizontal concrete components in the embodiments of the present invention; Figure 4 is a schematic diagram of step S21 when the FRP-ECC covering layer in the embodiments of the present invention is used for the construction of vertical concrete components; Figure 5 is a schematic diagram of setting the formwork of the vertical concrete component in step S22 when the FRP-ECC covering layer in the embodiments of the present invention is used for the construction of vertical concrete components; Figure 6 is a schematic diagram of pouring the concrete layer in step S22 when the FRP-ECC covering layer in the embodiments of the present invention is used for the construction of vertical concrete components; Figure 7 is a schematic diagram of step S23 when the FRP-ECC covering layer in the embodiments of the present invention is used for the construction of vertical concrete components; Figure 8 is a schematic diagram of steps S24 and S25 when the FRP-ECC covering layer in the embodiments of the present invention is used for the construction of vertical concrete components.

[0026] In the figure: 1. Connector; 2. Fixing piece; 3. FRP grid; 4. Steel bar; 5. Concrete layer; 6. ECC covering layer; 7. Formwork for vertical concrete member 101. Groove; 102. Insertion rod 201. Fixing rod; 202. Fixing groove; 203. Bolt; 204. Nut Specific implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "transverse", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] First aspect, as Figure 1 shown, in an embodiment of the construction method of the FRP-ECC covering layer of the present invention and its connection with a concrete member, the FRP-ECC covering layer is used to reinforce the construction strength of the concrete member, and includes a concrete member, a shear connector, an FRP grid 3, and an ECC covering layer 6; wherein, the shear connector is used to connect the concrete member and the FRP grid 3, and the ECC covering layer 6 is poured around the shear connector and the FRP grid 3; the shear connector includes a connector 1 and a fixing piece 2, and the connector 1 and the fixing piece 2 are detachably connected. As Figure 2 shown, the fixing piece 2 is used to connect the steel bar 4 of the concrete member, and the connector 1 is used to connect the FRP grid 3.

[0031] In the above-described exemplary embodiments, the FRP-ECC covering layer can be provided during the construction stage of concrete members. Through the high tensile strength of the FRP grid 3 and the high ductility of ECC, it can actively inhibit the generation of cracks caused by concrete shrinkage and load stress, avoiding the lag of passive repair in the prior art. By directly mechanically connecting the FRP grid 3 to the steel bars 4 of the concrete member through shear connectors, compared with the adhesive method of externally pasting FRP-ECC, the risk of interface peeling is significantly reduced, and the overall collaborative stress-bearing performance is improved. The detachable connection between the plug-in member 1 and the fixing member 2 enables the shear connectors to be flexibly applied to the construction of concrete members in different horizontal or vertical directions. The impermeability and microcrack control ability of the ECC covering layer 6 can block the erosion of moisture and chloride ions, delay the carbonation of concrete and the corrosion of steel bars 4, thereby extending the service life of underground structures. In summary, the FRP-ECC covering layer in this embodiment can effectively prevent cracks from occurring in underground structures, fundamentally solve the problem of performance degradation of underground structures caused by cracks, and take into account construction convenience and maintainability.

[0032] In some embodiments, as Figure 1 shown, the plug-in member 1 is provided with a plug-in rod 102, and the end of the fixing member 2 away from the steel bar 4 is provided with a plug-in hole. The plug-in rod 102 is inserted into the plug-in hole to realize the connection between the plug-in member 1 and the fixing member 2. Through the setting of the plug-in rod 102 and the plug-in hole, a stable mechanical connection is formed, effectively improving the uplift resistance and shear resistance between the plug-in member 1 and the fixing member 2, and avoiding connection failure caused by loosening or slipping.

[0033] It should be noted that the plug-in rod 102 is in close fit with the plug-in hole.

[0034] In some embodiments, to ensure the connection strength between the plug-in rod 102 and the plug-in hole, the surface of the plug-in rod 102 is provided with textures for increasing friction. By adding textures on the surface of the plug-in rod 102, the friction coefficient between it and the inner wall of the plug-in hole is increased, further enhancing the anti-slip ability of the plug-in connection, ensuring a stable connection under vibration or dynamic load, and at the same time reducing the risk of wear and loosening during long-term use.

[0035] In some embodiments, one end of the connector 1 provided with the groove 101 has a diameter equal to the outer diameter of the fixing rod 201, the diameter of the insertion rod 102 is smaller than the outer diameter of the fixing rod 201, and a step is formed at the diameter change of the connector 1. When the connector 1 is inserted into the insertion hole, the surface of the insertion hole fits with the step; to ensure the connection strength between the insertion rod 102 and the insertion hole, a welding point is provided at the step. By utilizing the step structure formed by the diameter change of the connector 1, the surface of the insertion hole fits tightly with the step, and is further fixed by the welding point, significantly enhancing the tensile and shear strength of the connection, preventing the insertion rod 102 from coming out, and at the same time ensuring more uniform and reliable load transfer, suitable for long-term stable use in high-stress environments.

[0036] In some embodiments, as Figure 1 shown, one end of the connector 1 away from the insertion rod 102 is provided with a groove 101, and the shape of the groove 101 matches that of the FRP grid 3. As a schematic embodiment, the FRP grid 3 is a cross grid, and the groove 101 is a cross groove 101. Through the setting of the groove 101, the precise positioning and tight fitting of the connector 1 and the FRP grid 3 are realized, effectively improving the connection reliability and load transfer efficiency between the two, and preventing the FRP grid 3 from displacing or loosening when stressed.

[0037] In some embodiments, as Figure 1 shown, the fixing member 2 includes a fixing rod 201 and a fixing groove 202. The fixing rod 201 is provided with an insertion hole, and the fixing groove 202 is connected to the fixing rod 201; one end of the fixing groove 202 away from the fixing rod 201 is open for sleeving with the steel bar 4. Through the setting of the fixing rod 201 and the fixing groove 202, the quick sleeving with the steel bar 4 is realized, simplifying the construction and installation process, and at the same time ensuring the stable connection between the fixing member 2 and the steel bar 4, providing a reliable foundation for the subsequent fixing of the FRP grid 3.

[0038] In some embodiments, as Figure 2 shown, bolt 203 holes are provided at both ends of the opening of the fixing groove 202. The fixing groove 202 is fixed to the steel bar 4 by bolts 203. Bolts 203 are inserted into the bolt 203 holes and fixed by nuts 204. Through the bolt 203 fastening method, the rigid connection between the fixing groove 202 and the steel bar 4 is realized, which not only enhances the tensile and shear strength of the connection, but also facilitates construction adjustment and later maintenance, especially suitable for the reinforcement of structural joints requiring high reliability.

[0039] It should be noted that when applying the FRP-ECC covering layer to the construction of concrete members, the number and position of shear connectors can be set as needed according to the size of the concrete members. For example, for a 2m * 2m concrete slab, 5 shear connectors can be set, and the 5 shear connectors are respectively set at the four peripheral endpoints and the center of the concrete slab.

[0040] In a second aspect, based on the above FRP-ECC overlay, the present invention also provides a construction method for connecting the FRP-ECC overlay to a concrete member, as Figure 3 shown, for the construction of a transverse concrete member. Using the above FRP-ECC overlay, the method includes the following steps: S11. Connect the fixing member 2 of the shear connector to the plug-in member 1, and fixedly connect the fixing member 2 to the steel bar 4; S12. Pour the concrete layer 5 around the steel bar 4 and the shear connector according to the design requirements; S13. After the concrete begins to set, connect the FRP grid to the plug-in member 1; S14. Pour the ECC overlay 6 evenly at the shear connector and the FRP grid 3 on the concrete surface according to the design requirements.

[0041] In the above exemplary embodiment, by pre-fixing the shear connector and adopting a formwork-free pouring process, the synchronous construction of the FRP-ECC overlay and the transverse member is achieved; the connection of the FRP grid 3 can be carried out after the concrete begins to set, and one-time pouring and forming (without waiting for the 28-day curing period for secondary pouring) avoids the problem of weak interfaces in traditional secondary pouring, shortens the construction period, and at the same time ensures the cooperative stress performance of the FRP grid 3 and the concrete member; the overall pouring of the ECC overlay 6 effectively improves the crack resistance and durability of the structure, and is applicable to transverse load-bearing members that require rapid construction.

[0042] In some embodiments, as Figure 1 shown, in step S11, the method of connecting the fixing member 2 of the shear connector to the plug-in member 1 is: inserting the plug-in rod 102 of the plug-in member 1 into the plug-in hole of the fixing member 2.

[0043] In a third aspect, based on the above FRP-ECC overlay, the present invention also provides a construction method for connecting the FRP-ECC overlay to a concrete member, as Figures 4 - 8 shown, for the construction of a vertical concrete member. Using the above FRP-ECC overlay, the method includes the following steps: S21. Disassemble the fixing member 2 of the shear connector from the plug-in member 1, as Figure 4 shown, and fixedly connect the fixing member 2 to the steel bar 4; S22. Set the formwork 7 for the vertical concrete member according to the design requirements, as Figure 5 shown, and pour the concrete layer 5 around the steel bar 4 and the fixing member 2; Figure 6 S23. After the concrete begins to set, remove the formwork 7 for the vertical concrete member, as shown, and connect the plug-in member 1 to the fixing member 2; Figure 7 shown, S24, as Figure 8 shown, connect the FRP grid to the connector 1; S25, according to the design requirements, as Figure 8 shown, evenly pour the ECC covering layer 6 at the shear connectors on the concrete surface and at the FRP grid 3.

[0044] In the above - mentioned exemplary embodiment, by using the connector and the fixing member 2 separately, it is avoided that the vertical structure formwork construction needs to open holes in the formwork at the shear connectors, and the one - time forming of the FRP - ECC system and the vertical concrete component is realized. By assembling the connector 1 and the FRP grid 3 after the initial setting, the connection reliability is ensured, and the cold joint defect that may be caused by layered pouring is avoided; the continuous construction of the overall structure not only improves the efficiency, but also enhances the integrity and impermeability of the vertical components, and is applicable to vertical structures such as basement walls with high durability requirements.

[0045] In some embodiments, in step S22, the pouring thickness of the concrete layer 5 does not exceed the end of the fixing member 2 away from the steel bar 4. By limiting the pouring thickness of the concrete, it is avoided that the concrete enters the insertion holes, ensuring that the insertion hole part is fully exposed, providing a reliable operation space and accurate positioning reference for the subsequent connection of the connector 1 and the FRP grid 3.

[0046] In some embodiments, in step S23, the method of connecting the connector 1 and the fixing member 2 is: insert the insertion rod 102 of the connector 1 into the insertion hole of the fixing member 2.

[0047] It should be noted that the "horizontal concrete component" in the present invention includes but is not limited to concrete components in the horizontal direction, and the "vertical concrete component" includes but is not limited to concrete components in the vertical direction; the difference in the construction process between the "horizontal concrete component" and the "vertical concrete component" lies in whether a formwork needs to be set when pouring the concrete layer 5. When a formwork needs to be set, the "construction method of vertical concrete components" is adopted.

[0048] Through the description of multiple embodiments of the construction method of the FRP - ECC covering layer of the present invention and its connection with concrete components, it can be seen that the embodiments of the construction method of the FRP - ECC covering layer of the present invention and its connection with concrete components have at least one or more of the following advantages: 1. The FRP - ECC covering layer provided by the present invention can be set during the construction stage of concrete components. Through the high tensile strength of the FRP grid 3 and the high ductility of ECC, it actively inhibits the generation of cracks caused by concrete shrinkage and load stress, avoiding the lag of passive repair in the prior art; 2. The construction method for connecting the FRP-ECC overlay with the concrete member provided by the present invention can be applied to the construction of horizontal concrete members. By pre-fixing the shear connectors and adopting a formwork-free casting process, the synchronous construction of the FRP-ECC overlay and the horizontal member is achieved; the connection of the FRP grid 3 can be carried out after the concrete begins to set, and the one-time casting avoids the weak interface problem of traditional secondary casting. 3. The construction method for connecting the FRP-ECC overlay with the concrete member provided by the present invention can be applied to the construction of vertical concrete members. By separately using the connectors and the fixing members 2, the need to cut holes in the formwork at the shear connectors during the formwork construction of the vertical structure is avoided, and the one-time forming of the FRP-ECC system and the vertical concrete member is achieved. By assembling the plug-in members 1 and the FRP grid 3 after the concrete begins to set, the connection reliability is ensured, and the cold joint defect that may be caused by layered casting is avoided.

[0049] Finally, it should be noted that the embodiments in this specification are described in a progressive manner, and the key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or some technical features can be equivalently replaced; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. FRP-ECC overlay, characterized in that, For strengthening the construction strength of concrete members, including concrete members, shear connectors, FRP grids, and ECC coatings; among them, the shear connectors are used to connect the concrete members and the FRP grids, and the ECC coatings are poured around the shear connectors and the FRP grids; The shear connectors include plug-in parts and fixing parts. The plug-in parts are detachably connected to the fixing parts. The fixing parts are used to connect the steel bars of the concrete members, and the plug-in parts are used to connect the FRP grids.

2. The FRP-ECC covering layer according to claim 1, wherein The plug-in part is provided with a plug-in rod. One end of the fixing part away from the steel bar is provided with a plug-in hole, and the plug-in rod is inserted into the plug-in hole to realize the connection between the plug-in part and the fixing part.

3. The FRP-ECC covering layer according to claim 2, characterized in that, One end of the plug-in part away from the plug-in rod is provided with a groove, and the shape of the groove matches that of the FRP grid.

4. The FRP-ECC overlay according to claim 2, wherein The fixing part includes a fixing rod and a fixing groove. The fixing rod is provided with a plug-in hole, and the fixing groove is connected to the fixing rod; one end of the fixing groove away from the fixing rod is open for sleeving with the steel bar.

5. The FRP-ECC covering layer according to claim 4, wherein Bolt holes are provided at both ends of the opening of the fixing groove, and the fixing groove is bolt-fixed to the steel bar.

6. Construction method for connecting FRP-ECC covering layer with concrete component, characterized in that, For the construction of horizontal concrete members, using the FRP-ECC coating according to any one of claims 1-5, including the following steps: S11, Connect the fixing part and the plug-in part of the shear connector, and fixedly connect the fixing part to the steel bar; S12, Pour the concrete layer around the steel bar and the shear connector according to the design requirements; S13, After the concrete starts to set, connect the FRP grid to the plug-in part; S14, Pour the ECC coating evenly at the shear connector and the FRP grid on the concrete surface according to the design requirements.

7. The construction method for connecting the FRP-ECC covering layer and the concrete member according to claim 6, characterized in that, In step S11, the method of connecting the fixing part and the plug-in part of the shear connector is: insert the plug-in rod of the plug-in part into the plug-in hole of the fixing part.

8. Construction method for connecting FRP-ECC covering layer with concrete member, characterized in that, For the construction of vertical concrete members, using the FRP-ECC coating according to any one of claims 1-5, including the following steps: S21, Disassemble the fixing part and the plug-in part of the shear connector, and fixedly connect the fixing part to the steel bar; S22, Set the formwork for the vertical concrete member according to the design requirements, and pour the concrete layer around the steel bar and the fixing part; S23, After the concrete starts to set, connect the plug-in part and the fixing part; S24, Connect the FRP grid to the plug-in part; S25, Pour the ECC coating evenly at the shear connector and the FRP grid on the concrete surface according to the design requirements.

9. The construction method for connecting the FRP-ECC overlay to the concrete member according to claim 8, wherein, In step S22, the pouring thickness of the concrete layer does not exceed the end of the fixing part away from the steel bar.

10. The construction method for connecting the FRP-ECC overlay layer and the concrete member according to claim 8, characterized in that, In step S23, the method of connecting the plug-in part and the fixing part is: insert the plug-in rod of the plug-in part into the plug-in hole of the fixing part.

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