Prefabricated built-in reinforcement structure with multi-functional connection nodes and reinforcement method

Abstract

The present invention discloses an assembled built-in reinforcement structure with multi-functional connection nodes and a reinforcement method for reinforcing an existing frame structure. The reinforcement structure includes: a reinforcement main body arranged along the inner side of the existing frame structure, which is formed by splicing multiple prefabricated components. The prefabricated components include a steel core and concrete wrapped outside the steel core. The steel cores of two spliced prefabricated components extend out of the corresponding concrete relatively and form extension segments; a plurality of multi-functional connection nodes are respectively arranged between every two spliced prefabricated components, and each multi-functional connection node includes a fixing member for butting and fixing the corresponding two extension segments to the existing frame structure and grouting material for pouring between the corresponding two concretes and wrapping the fixing member and the two extension segments. The present invention adopts prefabricated component assembly construction and multi-functional connection nodes, reduces the number of connection nodes, has a fast construction speed, and can ensure the cooperative working performance and stability of the reinforcement structure and the existing frame structure.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly to a prefabricated built-in reinforcement structure with multi-functional connection nodes and a reinforcement method. Background Art

[0002] At present, a considerable part of the old concrete frame structures in our country have potential safety hazards in terms of building material quality and construction quality, and the old existing buildings cannot meet the new seismic fortification standards. It is necessary to reinforce them. The existing reinforcement methods include the method of increasing cross-sectional area, the method of pasting carbon fiber for reinforcement, the method of steel-jacket reinforcement, the method of adding shear walls for reinforcement, etc. However, the method of increasing cross-sectional area involves on-site wet operations, the construction period is relatively long, and the building generally cannot be used normally during the construction period. The method of pasting carbon fiber for reinforcement has problems of aging and environmental pollution, the process is complex, and the construction conditions are demanding. The steel-jacket reinforcement method is greatly affected by environmental factors, and fire and rust prevention treatments need to be carried out on the steel sections. The method of adding shear walls for reinforcement affects the building layout and reduces the flexibility of the building space. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art, and proposes a prefabricated built-in reinforcement structure with multi-functional connection nodes and a reinforcement method. By using prefabricated component assembly construction and multi-functional connection nodes, the number of connection nodes is reduced, the construction speed is fast, and the collaborative working performance and stability of the reinforcement structure and the existing frame structure can be ensured.

[0004] The present invention is realized through the following scheme. A prefabricated built-in reinforcement structure with multi-functional connection nodes is used for reinforcing an existing frame structure. The reinforcement structure includes:

[0005] A reinforcement main body arranged along the inner side of the existing frame structure. The reinforcement main body is spliced by multiple prefabricated components. The prefabricated component includes a steel core and concrete wrapped outside the steel core. The steel cores of two adjacent prefabricated components extend out of the corresponding concrete relatively and form extension segments.

[0006] Multiple multi-functional connection nodes are respectively arranged between every two adjacent prefabricated components. The multi-functional connection node includes a fixing member for butting and fixing the corresponding two extension segments to the existing frame structure, and grouting material for pouring between the corresponding two concretes and wrapping the fixing member and the two extension segments.

[0007] A further improvement of the prefabricated built-in reinforcement structure with a multi-functional connection node of the present invention lies in that: the existing frame structure includes two frame columns arranged at intervals and a frame beam fixed between the tops of the two frame columns; the shape, quantity, and layout position of the prefabricated components are such that the multi-functional connection node is located in the middle of the frame beam or any one of the frame columns.

[0008] A further improvement of the prefabricated built-in reinforcement structure with a multi-functional connection node of the present invention lies in that: the multi-functional connection node further includes a post-cast non-removable formwork, which is assembled to cover the outside of the casting space surrounded by the corresponding two sections of concrete and the existing frame structure, and the post-cast non-removable formwork is provided with grouting holes for grouting material to be poured into the casting space.

[0009] A further improvement of the prefabricated built-in reinforcement structure with a multi-functional connection node of the present invention lies in that:

[0010] The post-cast non-removable formwork is a trough-shaped precast member, including a post-cast web and two post-cast flange plates fixed on opposite sides of the post-cast web, and the inner surface of the post-cast web is fixed with hanging ears that are turned outwards relatively at both ends.

[0011] Support ears extending inwards are fixed at the relative inner ends of the two spliced sections of concrete, and the two hanging ears are respectively hung on the two support ears when the post-cast non-removable formwork is misaligned and inserted and slid into place corresponding to the casting space.

[0012] A further improvement of the prefabricated built-in reinforcement structure with a multi-functional connection node of the present invention lies in that: the number of the grouting holes is at least two, and all are opened on one of the post-cast flange plates, and two of the grouting holes are respectively located at two corner positions of the post-cast flange plate far from the post-cast web.

[0013] A further improvement of the prefabricated built-in reinforcement structure with a multi-functional connection node of the present invention lies in that:

[0014] The cross-section of the steel core is in an H shape, including a first flange plate adjacent to the existing frame structure, a second flange plate far from the existing frame structure, and a web fixed between the first flange plate and the second flange plate, and a set of first reserved holes are opened at the position corresponding to the extension section on the first flange plate.

[0015] The fixing member includes two groups of anchor bolts and a first overlapping plate for being lapped between the first flange plates of the two spliced prefabricated components. A set of second reserved holes are opened at each of the two ends of the first overlapping plate, and they correspond to the two sets of first reserved holes one by one. The two groups of anchor bolts are respectively used to penetrate the two sets of second reserved holes and the corresponding set of first reserved holes and be anchored into the existing frame structure.

[0016] A further improvement of the prefabricated built-in reinforcement structure with multi-functional connection nodes of the present invention lies in that:

[0017] The fixing member further includes a second overlapping plate for being laid between the second flange plates or the webs of two spliced precast members, and a set of docking bolts for fixing the second overlapping plate to the corresponding two second flange plates or the corresponding two webs together.

[0018] The present invention also provides a prefabricated built-in reinforcement method, using the prefabricated built-in reinforcement structure with multi-functional connection nodes as described above to reinforce an existing frame structure. The reinforcement method includes the steps:

[0019] S1: Respectively arrange multiple precast members at corresponding positions inside the existing frame structure, and respectively arrange multiple of the multi-functional connection nodes between every two spliced precast members;

[0020] S2: During the execution of step S1:

[0021] Use the fixing member of the multi-functional connection node to butt and fix the extension sections of the corresponding two precast members together to the existing frame structure;

[0022] Pour grouting material between the corresponding two concretes, and make the grouting material wrap the fixing member and the two extension sections.

[0023] A further improvement of the prefabricated built-in reinforcement method of the present invention lies in that:

[0024] The multi-functional connection node further includes a post-cast non-removable formwork, and the post-cast non-removable formwork is provided with grouting holes;

[0025] After using the fixing member to butt and fix the extension sections of the corresponding two precast members together to the existing frame structure and before pouring grouting material between the corresponding two concretes, cover the post-cast non-removable formwork outside the pouring space surrounded by the corresponding two concretes and the existing frame structure;

[0026] Then pour the grouting material into the pouring space through the grouting holes.

[0027] A further improvement of the prefabricated built-in reinforcement method of the present invention lies in that:

[0028] The cross-section of the steel core is in an H shape, including a first flange plate, a second flange plate, and a web fixed between the first flange plate and the second flange plate. A set of first reserved holes are provided at a position on the first flange plate corresponding to the extension section; the fixing member includes two sets of anchor bolts and a first overlapping plate, and a set of second reserved holes are provided at each of the two ends of the first overlapping plate;

[0029] Before respectively arranging multiple prefabricated components at corresponding positions inside the existing frame structure, positioning holes are correspondingly provided at positions on the existing frame structure corresponding to each set of the first reserved holes;

[0030] When respectively arranging multiple prefabricated components at corresponding positions inside the existing frame structure, the first flange plate is adjacent to the existing frame structure, the second flange plate is away from the existing frame structure, and the first reserved holes correspond one-to-one with the positioning holes;

[0031] When using the fixing member to butt and fix the extension sections of two corresponding prefabricated components together to the existing frame structure, first place the first overlapping plate between the first flange plates of the two spliced prefabricated components, and make the two sets of second reserved holes correspond one-to-one with the two sets of first reserved holes, and then respectively penetrate the two sets of anchor bolts through the two sets of second reserved holes and the corresponding sets of first reserved holes and anchor them into the corresponding positioning holes.

[0032] Compared with the prior art, the advantages of the present invention are as follows:

[0033] By adopting prefabricated components for assembled construction, the construction speed can be significantly improved, the on-site wet operation can be reduced, and the construction quality can be guaranteed.

[0034] Through the setting of the multi-functional connection nodes, while realizing the splicing of the prefabricated components, it can also realize the fixation of the prefabricated components to the existing frame structure, solving the problems of excessive nodes, complex stress, and inability to ensure the cooperative working performance of the reinforced structure and the existing frame structure.

[0035] By setting the multi-functional connection nodes at the positions with less force on the existing frame structure to ensure the uplift resistance and shear resistance of the multi-functional connection nodes, and further through the reasonable setting of the overlapping plate and overlapping bolts at the nodes to ensure the cooperative working and stability performance between the reinforced structure and the existing frame structure.

[0036] Through the setting of the post-cast non-removable formwork, the pouring space at the nodes can be quickly closed, avoiding on-site formwork erection and pouring, and there is no need to disassemble after pouring, improving the construction speed.

[0037] By arranging the reinforcement structure inside the existing frame structure, it is not affected by the external environment and does not affect the layout of the existing frame structure, thus improving the flexibility of the building space. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 is the overall effect diagram after strengthening the existing frame structure with the reinforcement structure of the present invention.

[0040] Figure 2 is the internal structure schematic diagram of the multi-functional connection node after strengthening the existing frame structure with the reinforcement structure of the present invention.

[0041] Figure 3 is Figure 1 the enlarged schematic diagram at position A in

[0042] Figure 4 is Figure 2 the enlarged schematic diagram at position B in

[0043] Figure 5 is Figure 2 the enlarged schematic diagram at position C in

[0044] Figure 6 is the front view of the post-cast non-removable formwork in the reinforcement structure of the present invention.

[0045] Figure 7 is the side view of the post-cast non-removable formwork in the reinforcement structure of the present invention.

[0046] Figure 8 is the top view of the post-cast non-removable formwork in the reinforcement structure of the present invention.

[0047] In the figure: 1. Existing frame structure; 11. Frame beam; 12. Frame column; 13. Positioning hole; 2. Prefabricated component; 2A. L-shaped component; 2B. I-shaped component; 21. Extension section; 22. Support ear; 23. Web; 24. First flange; 25. Second flange; 3. Multi-functional connection node; 31. Fixing member; 311. First overlapping plate; 312. Anchor bolt; 313. Second overlapping plate; 314. Group of butt bolts; 32. Post-cast non-removable formwork; 321. Post-cast web; 322. Post-cast flange; 323. Hanging ear; 324. Grouting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] The following describes the implementation manners of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0049] The following further describes in detail an assembled built-in reinforcement structure and an assembled built-in reinforcement method with multi-functional connection nodes according to the present invention in conjunction with the accompanying drawings and specific embodiments.

[0050] Refer to Figures 1 to 5 As shown, an assembled built-in reinforcement structure with multi-functional connection nodes is used to reinforce an existing frame structure 1. The reinforcement structure includes: a reinforcement main body arranged along the inner side of the existing frame structure 1, the reinforcement main body is spliced by multiple precast members 2, the precast member 2 includes a steel core and concrete wrapped outside the steel core, and the steel cores of two adjacent precast members 2 extend out corresponding to the concrete and form extension segments 21. A plurality of multi-functional connection nodes 3 are respectively arranged between every two adjacent precast members 2. The multi-functional connection node 3 includes a fixing member 31 for butting and fixing two corresponding extension segments 21 together to the existing frame structure 1, and a grouting material (not shown in the figure) for pouring between two corresponding concretes and wrapping the fixing member 31 and two extension segments 21.

[0051] In this embodiment, by adopting the precast member 2 for prefabricated construction, the construction speed can be significantly improved, the on-site wet operation can be reduced, and the construction quality can be guaranteed. In this embodiment, the splicing between the precast members 2 and the fixation to the existing frame structure 1 are both realized through the multi-functional connection node 3, avoiding problems such as too many nodes, complex force, and inability to ensure the cooperative working performance of the reinforcement structure and the existing frame structure caused by separately adopting connection nodes. In addition, by arranging the reinforcement structure inside the existing frame structure, it is not affected by the external environment and does not affect the layout of the existing frame structure, improving the flexibility of the building space.

[0052] To ensure the anti-pulling and anti-shearing performance of the multi-functional connection node, it is preferred that the shape, quantity, and layout position of the precast member 2 can satisfy that the multi-functional connection node 3 is located at a position with less force in the existing frame structure 1. Figure 1 and Figure 2Taking the existing frame structure 1 shown as an example, the existing frame structure 1 includes two frame columns 12 arranged at intervals and a frame beam 11 fixed between the tops of the two frame columns 12. The shape, quantity, and layout position of the precast member 2 are such that the multi-functional connection node 3 is located in the middle of the frame beam 11 or any one of the frame columns 12. Because when the existing frame structure 1 bears the horizontal earthquake action, the middle parts of the frame column 12 and the frame beam 11 are the places where the stress is relatively small. Specifically, in this embodiment, the multiple sections of the precast member 2 of the reinforcement body include two L-shaped members 2A and two I-shaped members 2B. The two L-shaped members 2A are respectively used to be arranged at the two inside corners between the frame beam 11 and the two frame columns 12, and the two I-shaped members 2B are respectively used to be arranged on the relative inner sides of the two frame columns 12 and below the two L-shaped members 2A. The number of the multi-functional connection nodes 3 is three, and they are respectively arranged between the two L-shaped members 2A and between the two I-shaped members 2B and the two L-shaped members 2A, that is, at the places where the stress of the existing frame structure 1 is relatively small. Through the above settings, the stress performance of the multi-functional connection node 3 can be effectively improved.

[0053] In some preferred embodiments, referring to Figures 3 to 8 shown, the multi-functional connection node 3 further includes a post-cast non-removable formwork 32. The post-cast non-removable formwork 32 can be assembled to cover the outside of the casting space Q surrounded by the corresponding two sections of concrete and the existing frame structure 1. The post-cast non-removable formwork 32 is provided with a grouting hole 324 for grouting material corresponding to be poured into the casting space Q.

[0054] Specifically, the post-cast non-removable formwork 32 is a channel-shaped precast member, including a post-cast web 321 and two post-cast flange plates 322 fixed on the opposite sides of the post-cast web 321. Opposite ends of the inner surface of the post-cast web 321 are fixed with hanging ears 323 that are turned outwards relatively, as Figures 6 to 8 shown. Opposite inner ends of the two sections of concrete spliced together are fixed with support ears 22 extending inwards, as Figures 4 to 5As shown. Two such hanging ears 323 are misaligned and inserted into the post-cast non-removable formwork 32 and slide into place to be respectively hung on two such supporting ears 22 when corresponding to the casting space Q. It should be noted that the width of the supporting ear 22 in the sliding direction of the post-cast non-removable formwork 32 should not be greater than the thickness of the concrete-wrapped steel core on the precast member 2, so that when the post-cast non-removable formwork 32 is misaligned and inserted, the hanging ear 323 can completely avoid the corresponding supporting ear 22. After the hanging ear 323 passes over the supporting ear 22 during insertion, then slide the post-cast non-removable formwork 32 to make the hanging ear 323 and the supporting ear 22 face each other one by one, and the two form a relationship of mutual erection, which can prevent the post-cast non-removable formwork 32 from slipping out of the casting space Q along the insertion direction. Especially for the multi-functional connection node 3 arranged at the frame beam 11, without the support of the supporting ear 22, the post-cast non-removable formwork 32 will fall off the casting space Q under the action of gravity. Preferably, the thickness and position of the supporting ear 22 and the hanging ear 323 in the insertion direction of the post-cast non-removable formwork 32 just satisfy that when the supporting ear 22 and the hanging ear 323 are erected and in contact, the outer surface of the post-cast non-removable formwork 32 is flush with the outer surface of the adjacent concrete. Through the setting of the post-cast non-removable formwork 32 in this embodiment, the casting space Q can be quickly closed, avoiding on-site formwork erection for casting, and there is no need to disassemble after casting, improving the construction speed.

[0055] In order to improve the grouting speed, the number of the grouting holes 324 is at least two, and all are opened on one such post-cast flange plate 322. Preferably, two of the grouting holes 324 are respectively opened at two corner positions of the post-cast flange plate 322 far from the post-cast web plate 321. In this way, after the post-cast non-removable formwork 32 is covered outside the corresponding casting space Q, the grouting holes 324 at these two corner positions have a relatively high elevation. In addition to being able to supply grouting, they can also be used as overflow holes. That is, when grouting material overflows from these two grouting holes 324 with a higher elevation during grouting, it means that the casting space Q has been filled with grouting material, and then the continuous grouting can be stopped. Of course, for the convenience of operation and observation, other grouting holes 324 can be set at a lower elevation (such as near the post-cast web plate 321). Only the grouting holes 324 with a lower elevation are used for grouting, while the grouting holes 324 with a higher elevation are used as overflow holes for observation.

[0056] In some preferred embodiments, refer to Figure 4 and Figure 5As shown in the figure, the cross-section of the steel core is in an H shape, including a first flange plate 24 adjacent to the existing frame structure 1, a second flange plate 25 away from the existing frame structure 1, and a web 23 fixed between the first flange plate 24 and the second flange plate 25. A set of first reserved holes (not visible in the figure) are provided at the position corresponding to the extension section 21 on the first flange plate 24. The fixing member 31 includes two groups of anchor bolts 312 and a first overlapping plate 311 for being arranged between the first flange plates 24 of two spliced precast members 2. A set of second reserved holes (not visible in the figure) are provided at each of the two ends of the first overlapping plate 311, and they correspond to the two groups of first reserved holes one by one. The two groups of anchor bolts 312 are used to respectively penetrate through the two groups of second reserved holes and the corresponding group of first reserved holes and be anchored into the existing frame structure 1. Further, the fixing member 31 also includes two second overlapping plates 313 respectively arranged between the second flange plates 25 and the webs 23 of two spliced precast members 2, and two sets of docking bolts 314 for respectively fixing the two second overlapping plates 313 to the corresponding two second flange plates 25 and the corresponding two webs 23. Of course, on the premise of ensuring the mechanical properties of the multi-functional connection node 3, only one second overlapping plate 313 can also be provided, and the set of docking bolts 314 is used to overlap between the two second flange plates 25 or between the two webs 23. Through the reasonable arrangement of the first overlapping plate 311, the second overlapping plate 313, the anchor bolts 312 and the set of docking bolts 314, the reliable connection of the fixing member 33 to the two extension sections 21 is ensured, and further cooperating with the anchoring of the grouting material, the cooperative work and the stability between the reinforced structure and the existing frame structure 1 are ensured.

[0057] An assembled built-in reinforcement method. Refer to Figures 1 to 5 As shown in the figure, the existing frame structure 1 is reinforced by using the assembled built-in reinforcement structure with multi-functional connection nodes as described above. The reinforcement method includes the steps:

[0058] Step S1: Transport multiple precast members 2 to the site and respectively arrange them at the corresponding positions inside the existing frame structure 1, and respectively arrange multiple multi-functional connection nodes 3 between every two spliced precast members 2.

[0059] Step S2: During the execution of Step S1:

[0060] Use the fixing member 31 of the multi-functional connection node 3 to butt and fix the extension sections 21 of the corresponding two precast members 2 to the existing frame structure 1.

[0061] Pour grouting material between the corresponding two concretes, and make the grouting material wrap the fixing member 31 and the two extension sections 21.

[0062] Refer toFigures 3 to 8 As shown, for the case where the post-cast non-removable formwork 32 is provided at the multi-functional connection node 3: after the extension sections 21 of the corresponding two precast components 2 are butted together by the fixing member 31 and fixed to the existing frame structure 1, and before the grouting material is poured between the corresponding two concretes, the post-cast non-removable formwork 32 is covered outside the casting space Q surrounded by the corresponding two concretes and the existing frame structure 1. For the case where the hanging ears 323 and the supporting ears 22 are provided, the method of covering the post-cast non-removable formwork 32 is as follows: the opening of the post-cast non-removable formwork 32 faces the corresponding casting space Q, and the hanging ears 323 can completely avoid the corresponding supporting ears 22, and then the post-cast non-removable formwork 32 is inserted. When the insertion reaches the point where the hanging ears 323 cross over the supporting ears 22, the post-cast non-removable formwork 32 is slid so that the hanging ears 323 and the supporting ears 22 are in one-to-one alignment, and the two form a relationship of being lapped with each other, so that the post-cast non-removable formwork 32 remains in a state of being covered within the corresponding casting space Q. After the post-cast non-removable formwork 32 is covered, the grouting material is poured into the casting space Q through the grouting holes 324 opened thereon. During the pouring process, based on the layout position of the grouting holes 324, the grouting hole 324 with a higher elevation can be selected as the overflow hole to observe whether the casting space Q is filled. After the grouting material is poured, the post-cast non-removable formwork 32 does not need to be removed.

[0063] Refer to Figure 4 and Figure 5As shown, for the case where the steel core cross-section of the precast member 2 is H-shaped and the fixing member 31 includes anchor bolts 312 and a first overlapping plate 311: Before separately arranging multiple sections of the precast member 2 at corresponding positions inside the existing frame structure 1, positioning holes 13 are correspondingly drilled at positions on the existing frame structure 1 corresponding to each group of first reserved holes. When separately arranging multiple sections of the precast member 2 at corresponding positions inside the existing frame structure 1, make the first flange plate 24 adjacent to the existing frame structure 1, the second flange plate 25 away from the existing frame structure 1, and make the first reserved holes correspond one by one to the positioning holes 13. When using the fixing member 31 to butt and fix the extension sections 21 of two corresponding precast members 2 to the existing frame structure 1, first place the first overlapping plate 311 between the first flange plates 24 of the two spliced precast members 2 and make two groups of second reserved holes correspond one by one to two groups of the first reserved holes, and then respectively penetrate two groups of the anchor bolts 312 through two groups of the second reserved holes and the corresponding group of the first reserved holes and anchor them into the corresponding positioning holes 13. For the case further provided with a second overlapping plate 313 and a butt bolt group 314: It is also necessary to use the second overlapping plate 313 and the butt bolt group 314 to overlap and fix between two corresponding second flange plates 25 or two webs 23. After using the fixing member 31 to fix the two extension sections 21, then perform the steps of covering the above-mentioned post-cast non-removable formwork 32 and pouring grout.

[0064] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical substantial significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope under which the present invention can be implemented.

[0065] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments of equivalent changes within the scope of the technical solution of the present invention by using the above-disclosed technical content. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An assembled built-in reinforcement structure with multiple effective connection nodes, used to reinforce an existing frame structure, characterized in that: The reinforcement structure comprises: A reinforcement body arranged along the inner side of the existing frame structure, wherein the reinforcement body is formed by splicing a plurality of prefabricated components, wherein the prefabricated components include a steel core and concrete wrapped outside the steel core, and the steel cores of the two spliced ​​prefabricated components relatively extend out of the corresponding concrete to form an extension section; A plurality of multi-functional connection nodes are respectively arranged between each two sections of the spliced ​​prefabricated components, and the multi-functional connection nodes include a fixing member for butting the corresponding two sections of the extension together and fixing them to the existing frame structure, and a grouting material for pouring between the corresponding two sections of the concrete and wrapping the fixing member and the two sections of the extension; The multi-functional connection node further comprises a post-cast non-disassembly formwork, which can be assembled with a ground cover and arranged outside the casting space surrounded by the corresponding two sections of concrete and the existing frame structure, and the post-cast non-disassembly formwork is provided with grouting holes for the corresponding grouting material to be poured into the casting space; The post-cast non-disassembly formwork is a trough-shaped prefabricated part, comprising a post-cast web and two post-cast flange plates fixed on opposite sides of the post-cast web, and opposite ends of the inner surface of the post-cast web are fixed with hanging ears folded outwards relatively; The relative inner ends of the two spliced ​​sections of concrete are fixed with inwardly extending support ears, and the two hanging ears are respectively hung on the two supporting ears when the post-cast non-disassembly formwork is misplacedly inserted and slid into place to the corresponding casting space.

2. The assembled built-in reinforcement structure with multi-functional connection nodes according to claim 1, characterized in that: The existing frame structure includes two frame columns arranged at intervals and a frame beam fixed between the tops of the two frame columns; the shape, quantity and layout position of the prefabricated components meet the requirements that the multi-functional connection node is located in the middle of the frame beam or any of the frame columns.

3. The assembled built-in reinforcement structure with multi-functional connection nodes according to claim 1, characterized in that: The number of the grouting holes is at least two, and all of them are opened on one of the post-cast flange plates, wherein two of the grouting holes are respectively located at two corners of the post-cast flange plate away from the post-cast web plate.

4. The assembled built-in reinforcement structure with multi-functional connection nodes according to claim 1, characterized in that: The cross section of the steel core is H-shaped, including a first flange plate adjacent to the existing frame structure, a second flange plate away from the existing frame structure, and a web plate fixed between the first flange plate and the second flange plate, and a group of first reserved holes are opened on the first flange plate at a position corresponding to the extension section; The fixing parts include two groups of anchor bolts and a first lap plate for bridging the first flange plates of the two sections of prefabricated components to be spliced. A group of second reserved holes are respectively opened at the two ends of the first lap plate, and correspond one-to-one with the two groups of the first reserved holes. The two groups of anchor bolts are used to respectively penetrate the two groups of the second reserved holes and the corresponding group of the first reserved holes and be anchored into the existing frame structure.

5. The assembled built-in reinforcement structure with multi-functional connection nodes according to claim 4, characterized in that: The fixing member also includes a second lap plate for lapped between the second flange plates or the web plates of the two spliced ​​prefabricated components, and a butt bolt group for fixing the second lap plate with the corresponding two second flange plates or the corresponding two web plates.

6. An assembled built-in reinforcement method, characterized in that: The existing frame structure is reinforced by using the assembled built-in reinforcement structure with multi-functional connection nodes as claimed in claim 1, and the reinforcement method comprises the steps of: S1: arranging a plurality of sections of prefabricated components at corresponding positions inside the existing frame structure, and arranging a plurality of the multi-functional connection nodes between each two sections of the prefabricated components that are spliced; S2: During the execution of step S1: Using the fixing member of the multi-functional connection node to butt the corresponding two extension sections of the prefabricated components together and fix them to the existing frame structure; Grouting material is poured between the two corresponding sections of concrete, and the grouting material wraps the fixing member and the two extension sections.

7. The assembled built-in reinforcement method according to claim 6, characterized in that: After the corresponding two sections of the prefabricated component extensions are butt-jointed together and fixed to the existing frame structure by using fixing members, and before the grouting material is poured between the corresponding two sections of the concrete, the post-casting non-removal formwork cover is arranged outside the casting space enclosed by the corresponding two sections of concrete and the existing frame structure; Then, the grouting material is poured into the casting space through the grouting holes.

8. The assembled built-in reinforcement method according to claim 6, characterized in that: The cross section of the steel core is H-shaped, including a first flange plate, a second flange plate, and a web plate fixed between the first flange plate and the second flange plate, a group of first reserved holes is opened on the first flange plate at a position corresponding to the extension section; the fixing member includes two groups of anchor bolts and a first lap plate, and a group of second reserved holes is opened at each of the two ends of the first lap plate; Before arranging the plurality of prefabricated components at corresponding positions on the inner side of the existing frame structure, firstly, positioning holes are opened on the existing frame structure at positions corresponding to each group of the first reserved holes; When the multiple sections of prefabricated components are respectively arranged at corresponding positions inside the existing frame structure, the first flange plate is adjacent to the existing frame structure, the second flange plate is away from the existing frame structure, and the first reserved holes correspond to the positioning holes one by one; When the corresponding two sections of the extension sections of the prefabricated components are butt-jointed together and fixed to the existing frame structure using fixing parts, the first lap plate is firstly laid between the first flange plates of the two sections of the prefabricated components to be spliced, and the two groups of second reserved holes are made to correspond one to one with the two groups of the first reserved holes, and then the two groups of anchor bolts are respectively passed through the two groups of the second reserved holes and the corresponding groups of the first reserved holes and anchored into the corresponding positioning holes.

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