A connecting node device for reinforcing an existing building and a construction method

Abstract

The application discloses a connecting node device and a construction method for reinforcing an existing building, relates to the technical field of building reinforcing structures, and discloses a connecting node device and a construction method for reinforcing an existing building.

Description

Technical Field

[0001] This invention relates to the field of building reinforcement structure technology, and in particular to a connection node device and construction method for reinforcing existing buildings. Background Technology

[0002] As existing buildings age, many older residential buildings, due to lower design standards, degraded material properties, and insufficient seismic structural measures, are unable to meet current structural safety and seismic performance requirements. Therefore, reinforcement and renovation of existing buildings are necessary. Columns, as the main vertical load-bearing components of buildings, have a significant impact on the overall structural safety under seismic action and long-term loads, due to their load-bearing capacity, stiffness, and ductility.

[0003] In the current process of reinforcing and renovating old residential buildings, traditional methods such as increasing the cross-section, external steel reinforcement, or adhesive reinforcement are often used to strengthen existing cast-in-place columns. However, the stability of these methods is relatively poor. Especially in the connection area between the new and old components, the reinforced component and the original cast-in-place column often bear axial force, shear force, and bending moment simultaneously, forming a complex composite stress state. Stress concentration, cracking, and even local failure can easily occur at the connection nodes, thus affecting the overall structural stability and seismic performance.

[0004] Therefore, how to improve the overall stability and seismic resistance of existing buildings after reinforcement has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a connection node device and construction method for reinforcing existing buildings, so as to improve the overall stability and seismic resistance of existing buildings after reinforcement.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a connection node device for reinforcing existing buildings, the connection node device comprising: First load-bearing component and second load-bearing component; The post-casting area includes a first post-casting channel located inside the first load-bearing component and a second post-casting channel located inside the second load-bearing component. The first post-casting channel and the second post-casting channel are sequentially arranged and connected along a first direction. A connecting assembly, the connecting assembly including a first connecting unit, the first connecting unit including a first connecting sleeve disposed along the first direction, the first end of the first connecting sleeve being located in the first post-pouring channel, the first connecting sleeve being provided with a first reinforcing member located in the first load-bearing member and the second load-bearing member, the first connecting sleeve being spaced apart from the first post-pouring channel, and the first reinforcing member being spaced apart from the first connecting sleeve; The first load-bearing component is a reinforcement structure, and the second load-bearing component is a building to be reinforced. The first direction is set from the first load-bearing member toward the second load-bearing member; The area between the first post-pouring channel and the first connecting sleeve, as well as the area between the first connecting sleeve and the first reinforcing member, are both used for pouring grout.

[0007] Furthermore, the present invention also discloses a construction method for constructing the above-mentioned connection node device, the construction method comprising the following: Step S1: Fabricate the first load-bearing component and the connecting assembly; Step S2: Perform base treatment on the second load-bearing component. The base treatment includes removing the finishing layer and loose areas on the surface of the second load-bearing component, and roughening the area on the second load-bearing component that is connected to the first load-bearing component, cleaning up dust and debris, so that the area on the second load-bearing component that is connected to the first load-bearing component reaches the required roughness. Step S3: Use hoisting equipment to hoist the first load-bearing component to the corresponding height and align it with the corresponding area of ​​the second load-bearing component; Step S4: Install templates on the outside of the first and second load-bearing components to form the post-cast area; Step S5: Inject grout into the post-cast area; Step S6: After the grout in the post-pouring zone is poured and reaches initial setting, cover and moisturize it for curing until the design strength requirement is met. After the grout in the post-pouring zone reaches the design strength, remove the template and conduct an appearance inspection and quality acceptance of the connection node device.

[0008] The present invention achieves the following technical effects compared to the prior art: The connection node device for reinforcing existing buildings in this invention includes a first load-bearing component, a second load-bearing component, a post-cast area, and a connection assembly. The post-cast area includes a first post-cast channel located inside the first load-bearing component and a second post-cast channel located inside the second load-bearing component. The first and second post-cast channels are sequentially arranged and connected along a first direction and are used for pouring grout. The connection assembly includes a first connection unit, which includes a first connection sleeve arranged in a first direction. The first end of the first connection sleeve is located inside the first post-cast channel. The first connection sleeve contains a first reinforcing member located inside the first and second load-bearing components. The first connection sleeve is spaced apart from the first post-cast channel, and the first reinforcing member is spaced apart from the first connection sleeve. The first load-bearing component is the reinforcing structure, the second load-bearing component is the building to be reinforced, and the first direction is from the first load-bearing component toward the second load-bearing component. The area between the first post-cast channel and the first connection sleeve, and the area between the first connection sleeve and the first reinforcing member, are both used for pouring grout. Based on the above structure, the connecting component connects the first load-bearing component and the second load-bearing component, so that the first load-bearing component and the second load-bearing component form an integral force-bearing system. The connecting component can realize the load transfer between the first load-bearing component and the second load-bearing component. After the required grout is poured into the post-pouring area, the space between the first post-pouring channel and the first connecting sleeve, and the space between the first connecting sleeve and the first reinforcing component are filled with grout. Compared with the existing technology where the area to be reinforced and the new reinforced structure are only connected by bolts, or only by rebar, or only by external steel, this increases the contact area between the first connecting unit and the connecting component and the grout in the post-pouring area, and enhances the ability of the connecting component and the grout in the post-pouring area to work together. It improves the connection strength and node stiffness between the area to be reinforced and the new reinforced structure, and improves the bearing capacity, overall stability, durability and seismic performance of the building structure at the connection node between the area to be reinforced and the new reinforced structure. In summary, the connection node device for reinforcing existing buildings in this invention can improve the strength and stiffness of the connection node between the area to be reinforced and the new reinforced structure, thereby improving the overall stability and seismic resistance of the existing building after reinforcement. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the connecting node device; Figure 2 This is a front view of the connecting node device; Figure 3 This is a side view of the first load-bearing component; Figure 4 This is a side view of the second load-bearing component; Figure 5 This is a sectional view at point AA in the diagram; Figure 6 This is a sectional view at point BB in the diagram; Figure 7 This is a structural diagram of the connecting components; Figure 8 This is a sectional view of the connection between the first and second load-bearing components. Figure 9 This is a structural schematic diagram of a flange connection assembly; The components are as follows: 1. First load-bearing part; 2. Second load-bearing part; 3. Second load-bearing component; 4. First flange plate; 5. Second flange plate; 6. First post-cast channel; 7. Second post-cast channel; 8. First connecting plate; 9. Second connecting plate; 10. First connecting sleeve; 11. Second connecting sleeve; 12. First longitudinal rib; 13. Second longitudinal rib; 14. First stirrup; 15. First reinforcing member; 16. Second reinforcing member; 17. Grout; 18. Mounting hole; 19. Connecting hole; 20. First stiffening rib; 21. Second stiffening rib; 22. Butt hole; 23. Connecting bolt. Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] like Figures 1-9As shown, this invention discloses a connection node device for reinforcing existing buildings. The connection node device for reinforcing existing buildings includes a first load-bearing component, a second load-bearing component 3, a post-casting zone, and a connection assembly. The post-casting zone includes a first post-casting channel 6 located inside the first load-bearing component and a second post-casting channel 7 located inside the second load-bearing component 3. The first post-casting channel 6 and the second post-casting channel 7 are sequentially arranged and connected along a first direction and are used for pouring grout 17. The connection assembly includes a first connection unit, which includes a first connection sleeve 10 arranged in the first direction. The first end of 0 is located in the first post-pouring channel 6. The first connecting sleeve 10 is provided with a first reinforcing member 15 located in the first load-bearing member and the second load-bearing member 3. The first connecting sleeve 10 and the first post-pouring channel 6 are spaced apart, and the first reinforcing member 15 and the first connecting sleeve 10 are spaced apart. The first load-bearing member is a reinforcement structure, the second load-bearing member 3 is a building to be reinforced, and the first direction is set from the first load-bearing member to the second load-bearing member 3. The area between the first post-pouring channel 6 and the first connecting sleeve 10, and the area between the first connecting sleeve 10 and the first reinforcing member 15 are used for pouring grout 17. Based on the above structure, the connecting component connects the first load-bearing member and the second load-bearing member 3, so that the first load-bearing member and the second load-bearing member 3 form an integral force-bearing system. The connecting component can realize the load transfer between the first load-bearing member and the second load-bearing member 3. After the required grout 17 is poured into the post-pouring area, the first post-pouring channel 6 and the first connecting sleeve 10, and the first connecting sleeve 10 and the first reinforcing member 15 are filled with grout 17. Compared with the existing technology where the area to be reinforced and the new reinforced structure are only connected by bolts, or only by rebar, or only by external steel, this increases the contact area between the first connecting unit and the connecting component and the grout 17 in the post-pouring area, and enhances the ability of the connecting component and the grout 17 in the post-pouring area to work together. It improves the connection strength and node stiffness between the area to be reinforced and the new reinforced structure, and improves the bearing capacity, overall stability, durability and seismic performance of the building structure at the connection node between the area to be reinforced and the new reinforced structure. In summary, the connection node device for reinforcing existing buildings in this invention can improve the strength and stiffness of the connection node between the area to be reinforced and the new reinforced structure, thereby improving the overall stability and seismic resistance of the existing building after reinforcement.

[0014] The second load-bearing component 3 can be an existing, already solidified reinforced concrete column, or other types of load-bearing components, depending on the actual situation. The first load-bearing component is located on the side of the second load-bearing component 3 that is furthest from the existing building.

[0015] The first load-bearing component can be a monolithic structure, such as a precast column formed by integral casting. Alternatively, the first load-bearing component includes a first load-bearing part 1 and a second load-bearing part 2 arranged sequentially and connected along a second direction. Depending on the orientation of the area requiring reinforcement in the existing building, the first and second directions may have different arrangement methods to meet the reinforcement needs of different building structures; the included angle between the first and second directions is A, where 0° < A ≤ 90°; the first load-bearing part 1 and the second load-bearing part 2 can be precast reinforced concrete columns, steel structures, steel-concrete composite structures, or other types of precast load-bearing components. Figures 1-9 As shown, in this case, the first direction can be horizontal, and the second direction can be vertical. Figures 1-9 As shown, at this time, the first load-bearing component includes a first load-bearing part 1 and a second load-bearing part 2 arranged in the vertical direction (or, as needed, more load-bearing parts can be added and connected to form the first load-bearing component, and the load-bearing parts are prefabricated columns).

[0016] The first load-bearing part 1 and the second load-bearing part 2 can be connected by rebar anchoring, or, as... Figures 1-9 As shown, a first flange plate 4 is provided on the outer side of the first load-bearing part 1 facing the second load-bearing part 2, and a second flange plate 5 is provided on the outer side of the second load-bearing part 2 facing the first load-bearing part 1. The first flange plate 4 and the second flange plate 5 are fixedly connected by fasteners such as connecting bolts 23. When the first flange plate 4 and the second flange plate 5 are connected, the first flange plate 4 and the second flange plate 5 fit together. The rebar or the combination of the above flange plate and connecting bolts 23 realizes the transmission of axial force, shear force and bending moment between the first load-bearing part 1 and the second load-bearing part 2, and improves the overall connection stiffness and stress performance of the precast column. The first flange plate 4 and the second flange plate 5 can be rectangular steel plates with dimensions of 500 mm in length, 400 mm in width, and 10 mm in thickness to meet the stress requirements of the connection node. Both the first flange plate 4 and the second flange plate 5 have several mating holes 22, which are correspondingly arranged. When connecting the first flange plate 4 and the second flange plate 5, the connecting bolts 23 pass through the mating holes 22 on the first flange plate 4 and the second flange plate 5 in sequence, and nuts are tightened onto the connecting bolts 23 to apply preload. This ensures a reliable connection between the first load-bearing part 1 and the second load-bearing part 2 through the structure of the first flange plate 4, the second flange plate 5, the connecting bolts 23, and the nuts. Specifically, the connecting bolts 23 can be 16 mm in diameter (the term "connecting bolt 23" is only used for easy differentiation from the above-mentioned bolts; the actual structure is that of existing bolts) to ensure that the connection between the first flange plate 4 and the second flange plate 5 has sufficient tensile, shear, and bending load-bearing capacity.

[0017] like Figures 1-9As shown, the first flange plate 4 is provided with a first stiffening rib 20, which can be spaced apart circumferentially along the first flange plate 4. The first stiffening rib 20 has a triangular structure, and the first stiffening rib 20 and the first flange plate 4 are connected by welding or bolts. Correspondingly, the second flange plate 5 is provided with a second stiffening rib 21, which can be spaced apart circumferentially along the second flange plate 5. The second stiffening rib 21 has a trapezoidal structure, and the second stiffening rib 21 and the second flange plate 5 are connected by welding or bolts. It should be noted that the shapes of the first stiffening rib 20 and the second stiffening rib 21 can be adjusted according to requirements. For example, if the working condition requires, the stiffening ribs on the first flange plate 4 can be set in the form of alternating triangular stiffening ribs and trapezoidal stiffening ribs, or only trapezoidal stiffening ribs can be used, or other single shapes or combinations of stiffening ribs can also be used. By setting the first stiffening rib 20 and the second stiffening rib 21, the stiffness at the connection between the first flange plate 4 and the second flange plate 5 is improved, reducing the local deformation of the first flange plate 4 and the second flange plate 5 under load; the transmission capacity of axial force, shear force and bending moment between the first load-bearing part 1 and the second load-bearing part 2 is improved, enhancing the overall stiffness, bending resistance and overall stability of the first load-bearing part 1 and the second load-bearing part 2, so that the first load-bearing part 1 and the second load-bearing part 2 form a continuous force system, improving the overall load-bearing capacity, stability and seismic performance of existing buildings such as existing concrete columns after reinforcement; and compared with the method of connecting the first load-bearing part 1 and the second load-bearing part 2 by pouring grout 17, the construction and assembly efficiency of connecting the first load-bearing part 1 and the second load-bearing part 2 by the above-mentioned flange plate + bolt method is higher, and it can realize rapid assembly reinforcement of the second load-bearing component 3. The first stiffening rib 20 and the second stiffening rib 21 can be made of 16mm thick steel plate. The first stiffening rib 20 on the first flange plate 4 is arranged symmetrically along its height direction, and the second stiffening rib 21 on the second flange plate 5 is arranged symmetrically along its height direction.

[0018] The grout 17 poured in the post-cast zone can be UHPC (UHPC stands for Ultra-High Performance Concrete), or other types of concrete, or other types of grout 17 that can connect the first load-bearing component and the second load-bearing component 3 together.

[0019] The second connecting unit includes a second connecting sleeve 11 arranged along a first direction. The first end of the second connecting sleeve 11 is located inside the first load-bearing member. A second reinforcing member 16 is provided inside the second connecting sleeve 11, located within both the first and second load-bearing members 3. The first connecting sleeve 10 and the second connecting sleeve 11 are spaced apart. For example, with the first connecting unit as the center and the required working distance as the radius, several second connecting units can be spaced apart circumferentially along the first connecting unit. Figures 1-9As shown, the first load-bearing component has one first connecting unit and four second connecting units, and / or the diameter of the first connecting sleeve 10 is larger than the diameter of the second connecting sleeve 11, so as to maximize the contact area between the first connecting sleeve 10 and the first post-cast channel 6, and between the first connecting sleeve 10 and the first reinforcing member 15. Figures 1-9 As shown, the first reinforcing member 15 includes a first reinforcing sleeve, such as a cast iron round tube, and / or the second reinforcing member 16 includes a first reinforcing rod; alternatively, the first reinforcing member 15 may be other annular structures, such that grout 17 is provided on both the inner and outer sides of the first reinforcing member 15. Compared with pouring grout 17 only on the outer side of the first reinforcing member 15, this obviously enhances the contact area and strength between the first reinforcing member 15 and the grout 17; the second reinforcing member 16 may specifically be a through-bolt (through-bolt or tie rod), or the second reinforcing member 16 may be a plate-shaped or block-shaped structure. As needed, multiple first connecting units and second connecting units may be spaced apart along the height direction of the first load-bearing member.

[0020] After the grout 17 is poured into the gap between the first connecting sleeve 10 and the first reinforcing sleeve, the solidified grout 17 forms a composite load-bearing structure between the first connecting sleeve 10 and the first reinforcing sleeve. The first connecting sleeve 10 provides external constraint to the grout 17 in this area, and the first reinforcing sleeve provides internal constraint to the grout 17 in this area, thus achieving a double constraint from the inside and outside. The first connecting sleeve 10 provides radial constraint on the grout 17, limiting the lateral expansion of the grout 17 under pressure in this area, thereby improving the compressive strength, ductility, and crack resistance of the grout 17. This results in the first connecting plate 8, the second connecting plate 9, the first connecting sleeve 10, the second connecting sleeve 11, the first reinforcing member 15, the second reinforcing member 16, the grout 17 poured in the post-pouring zone, the first flange plate 4, the second flange plate 5, and the bolts forming a composite load-bearing system, which improves the load-bearing capacity, shear resistance, and seismic performance of the connection node device. At the same time, the grout 17 poured in the first post-pouring channel 6 forms a reliable bond with the first connecting plate 8 and the second connecting plate 9, allowing the load to be transferred from the first connecting plate 8 and the second connecting plate 9 to the grout 17 in the first post-pouring channel 6, and then to the second load-bearing member 3 via the first reinforcing member 15. This forms a continuous force transmission path, improving the overall stress performance of the connection components and the load-bearing capacity, shear resistance, and seismic performance of the connection node device.

[0021] When the first reinforcing member 15 is a cast iron round tube or other annular structure, the axis of the first reinforcing member 15 is arranged parallel to the axis of the first connecting sleeve 10, that is, arranged along the first direction. The first connecting sleeve 10 passes through the first load-bearing member and the second load-bearing member 3; and / or, the second connecting sleeve 11 passes through the first load-bearing member and the second load-bearing member 3. Alternatively, as needed, the first connecting sleeve 10 may be completely located within the first load-bearing member, and / or, the second connecting sleeve 11 may be completely located within the first load-bearing member.

[0022] The connecting assembly includes a first connecting plate 8 and a second connecting plate 9 spaced apart along a first direction. The first connecting plate 8 is located on the side of the first load-bearing member away from the second load-bearing member 3, and the second connecting plate 9 is located between the first load-bearing member and the second load-bearing member 3. The first connecting sleeve 10 and the second connecting sleeve 11 are both inserted into the interior of the first connecting plate 8 and the second connecting plate 9, and are both fixedly connected to the first connecting plate 8 and the second connecting plate 9, such as by welding or by pouring grout 17. The second reinforcing member 16 can be fixed to the first connecting plate 8 by a nut provided on the first connecting plate 8 to apply a preload to the first load-bearing part 1 and the second load-bearing member 3, thereby improving the connection strength between the first load-bearing member and the second load-bearing member 3. Alternatively, if the working conditions permit, the second reinforcing member 16 and the first connecting plate 8 can also be welded together. The first reinforcing member 15, together with the first connecting plate 8 and the second connecting plate 9, constitutes the skeleton of the connecting assembly. Compared with the method without the first reinforcing member 15 and the aforementioned connecting plate, this improves the overall rigidity and stability of the connecting assembly, enhances the constraint effect of the slurry 17, and enables the connecting node device to form a more continuous and stable composite force transmission system, further improving the stress reliability and durability of the connecting node device.

[0023] The first connecting plate 8 and the second connecting plate 9 are fixedly connected by a plurality of first connecting sleeves 10 and a plurality of second connecting sleeves 11. The first connecting sleeves 10 and the first connecting plate 8 and the second connecting plate 9, and the second connecting sleeves 11 and the first connecting plate 8 and the second connecting plate 9, can be welded together. The first connecting sleeves 10 and the second connecting sleeves 11 are both set perpendicular to the first connecting plate 8 and the second connecting plate 9. The plurality of first connecting sleeves 10 and the plurality of second connecting sleeves 11 are set at intervals along the height direction of the first connecting plate 8 and the second connecting plate 9, which are used to constrain the slurry 17 that has been cured in the post-pouring zone and to transfer the load between the first load-bearing component and the second load-bearing component 3.

[0024] Specifically, the outer diameter of the first connecting sleeve 10 can be 110mm. The first reinforcing sleeve is coaxially arranged with the first connecting sleeve 10. The outer diameter of the first reinforcing sleeve is 100mm, the inner diameter is 90mm, and the wall thickness is 5mm. A connecting hole 19 is provided through the second connecting sleeve 11 along its axial direction. Mounting holes 18 are provided on both the first connecting plate 8 and the second connecting plate 9, which are coaxially arranged with the connecting hole 19. The second reinforcing member 16 is inserted into the connecting hole 19 along the axial direction of the second connecting sleeve 11. The diameter of the connecting hole 19 is larger than the outer diameter of the second reinforcing member 16. The second connecting sleeve 11 and the second reinforcing member 16 are clearance-fitted. The second reinforcing member 16 passes through the first load-bearing member, the second connecting sleeve 11, and the second load-bearing member 3. A preload is applied by a nut fitted on the end of the second reinforcing member 16 away from the first load-bearing member, so that a reliable connection between the first load-bearing member and the second load-bearing member 3 can be achieved, so that the connecting node device can form an integral force-bearing system. The diameter of the connecting hole 19 is 24mm to meet the installation requirements of the second reinforcing member 16. The center of the connecting hole 19 is 72mm away from the left and right edges of the second connecting sleeve 11 and 65mm away from the upper and lower edges of the second connecting sleeve 11. Due to the clearance fit between the second reinforcing member 16 and the second connecting sleeve 11, the stress concentration in the local area of ​​the second connecting sleeve 11 is reduced, and the overall load-bearing capacity and shear resistance of the connection node device are improved. According to the design load, bearing capacity requirements and other working conditions of the node, several second connecting sleeves 11 can be set along the height direction of the first load-bearing member to meet the reinforcement needs of existing buildings of different specifications, such as existing concrete columns.

[0025] The first connecting sleeve 10, the second connecting sleeve 11, the first reinforcing member 15, the second reinforcing member 16, and the grout 17 poured in the post-cast zone jointly bear the transmission of axial force, shear force, and bending moment of the connecting node device, improving the connection strength, overall stiffness, and cooperative load-bearing capacity between the first load-bearing member and the second load-bearing member 3. The grout 17 poured in the post-cast zone can wrap the first connecting plate 8, the second connecting plate 9, and the first reinforcing member 15, improving the bonding performance and cooperative working capacity between the above structures, so that the first load-bearing member and the second load-bearing member 3 form an integral load-bearing structure, reducing stress concentration at the connecting node device, and improving the load-bearing capacity and seismic performance of the connecting node device.

[0026] The first connecting plate 8 and the second connecting plate 9 are embedded inside the first load-bearing member; and / or, the first connecting plate 8 and the second connecting plate 9 are symmetrically arranged inside the first load-bearing member and extend along the height direction of the first load-bearing member to the connection point of the first load-bearing member and the second load-bearing member 3, so as to be connected to the connecting assembly. Alternatively, if required by the working conditions, the first connecting plate 8 and the second connecting plate 9 can also be fixed to the aforementioned opposite sides of the first load-bearing member by bolts. The first connecting plate 8 and the second connecting plate 9 can specifically be steel plates.

[0027] Specifically, the thickness of the annular gap between the second connecting sleeve 11 and the second reinforcing member 16 can be 2mm, that is, the inner diameter of the second connecting sleeve 11 is 4mm larger than the diameter of the second reinforcing member 16. This makes the second connecting sleeve 11 and the second reinforcing member 16 not contact each other, and the second reinforcing member 16 only bears bending moment and not shear force, so that the connection between the first load-bearing member and the second load-bearing member 3 has high load-bearing capacity and energy dissipation effect.

[0028] like Figures 1-9 As shown, the first load-bearing part 1 is provided with several first longitudinal bars 12. The diameter of the first longitudinal bars 12 can be HRB400 grade steel bars with a diameter of 16mm, and they are constrained by first stirrups 14 to form a steel skeleton. The first stirrups 14 can be HPB300 grade steel bars with a diameter of 10mm. The first stirrups 14 are spaced apart along the height direction of the first load-bearing part 1. The density of the first stirrups 14 in the area near the connection between the first load-bearing member and the second load-bearing member 3 is greater than that in the area away from the connection between the first load-bearing member and the second load-bearing member 3 (the spacing between adjacent first stirrups 14 in the area near the connection between the first load-bearing member and the second load-bearing member 3 is 100mm; the spacing between adjacent first stirrups 14 in the area away from the connection between the first load-bearing member and the second load-bearing member 3 is 200mm), so as to improve the confinement capacity and seismic performance of the concrete near the connection between the first load-bearing member and the second load-bearing member 3. The thickness of the concrete protective layer outside the first longitudinal bars 12 is 40mm. The second load-bearing component 3 has several second longitudinal bars 13, each with a diameter of 16mm. The concrete cover outside the second longitudinal bars 13 is 40mm thick. The first longitudinal bars 12 and the second longitudinal bars 13 enable the first load-bearing component to have a certain load-bearing capacity, and ensure sufficient anchorage length and stress performance between the connecting components and the first load-bearing component, while also facilitating the arrangement of the connecting components.

[0029] Based on the aforementioned advantages of the connection node device in this invention, the connection node device can be applied to existing concrete structures, prefabricated concrete structures, and other engineering scenarios requiring the connection of new and old components. It achieves reliable connections between different types of load-bearing components, improves the node's load-bearing capacity, overall stiffness, and seismic performance, and reduces the later maintenance costs of the structure. Compared with existing technologies that rely on extensive steel bar anchoring or complex steel plate reinforcement, this invention uses a composite load-bearing system composed of a first connecting plate 8, a second connecting plate 9, a first connecting sleeve 10, a second connecting sleeve 11, a first reinforcing member 15, a second reinforcing member 16, grout poured in the post-cast zone 17, a first flange plate 4, a second flange plate 5, and bolts. This system is simple in structure, convenient to construct, and has clearly defined stress, making it highly valuable for engineering applications.

[0030] Furthermore, the present invention also discloses a construction method for constructing the aforementioned connection node device, the construction method comprising the following: Step S1: Fabricate the first load-bearing component and connecting assembly; specifically, prefabricate the first load-bearing component in the factory (if the first load-bearing component includes a first load-bearing part 1 and a second load-bearing part 2, then prefabricate the first load-bearing part 1 and the second load-bearing part 2 in the factory), and pre-embed a first connecting plate 8 and a second connecting plate 9 within the first load-bearing component. The first connecting plate 8 and the second connecting plate 9 are located on opposite sides of the first load-bearing component and are symmetrically arranged. The thickness direction of the first connecting plate 8 and the second connecting plate 9 extends from the first load-bearing component towards the second load-bearing component 3. Simultaneously, insert a first connecting sleeve 10 into the first load-bearing component and weld and fix the first connecting sleeve 10 to the first connecting plate 8 and the second connecting plate 9. A first reinforcing sleeve is coaxially installed inside the connecting sleeve 10, forming an annular cavity between the first connecting sleeve 10 and the first reinforcing sleeve for injecting grout 17, such as UHPC. After injecting grout 17 into the annular cavity and other post-cast areas, the first connecting sleeve 10, the first reinforcing sleeve, the first connecting plate 8, and the second connecting plate 9 form an integral load-bearing assembly. In addition, a first flange plate 4 and a second flange plate 5 are pre-embedded at the connection ends of the first load-bearing part 1 and the second load-bearing part 2, respectively, and a first stiffening rib 20 and a second stiffening rib 21 are welded to the outside of the first flange plate 4 and the second flange plate 5, respectively. A mating hole 22 is reserved on the first flange plate 4 and the second flange plate 5 for subsequent installation of bolts. Step S2: Perform base treatment on the second load-bearing component 3. Base treatment includes removing the finishing layer and loose areas from the surface of the second load-bearing component 3 (if the second load-bearing component 3 is a concrete column, the loose areas correspond to loose concrete), and roughening the area on the second load-bearing component 3 that is connected to the first load-bearing component, cleaning off dust and debris (existing high-pressure air or high-pressure water guns can be used to remove dust and debris), so that the surface of the second load-bearing component 3, at least the area of ​​the second load-bearing component 3 that is connected to the first load-bearing component, reaches the required roughness, thereby improving the bonding performance between the grout 17 in the post-cast area and the existing building, i.e., the second load-bearing component 3; and position and mark the second load-bearing component 3 to determine the installation position of the first load-bearing component. Step S3: Use a crane or other existing hoisting equipment to hoist the first load-bearing part 1 to the corresponding height and align it with the corresponding area of ​​the second load-bearing part 3. Specifically, adjust the position, elevation, and verticality of the first load-bearing part 1 using the hoisting equipment so that the first connecting sleeve 10, the second connecting sleeve 11, and the second load-bearing part 3 correspond to the design positions, ensuring that a post-cast area that meets the design requirements can be formed between the first load-bearing part and the second load-bearing part 2. Adjust the position of the second connecting sleeve 11 so that the second connecting sleeve 11 and the pre-reserved through hole in the second load-bearing part 3 remain coaxial, providing installation conditions for the installation of the second reinforcing member 16. Next, install the connecting assembly, insert the second reinforcing member 16 through the first load-bearing part 1 into the second load-bearing part 3, and install a washer and nut in sequence on the end of the second reinforcing member 16 away from the second load-bearing part 3. Apply pre-tightening force according to design requirements to form a reliable connection between the first load-bearing part 1, the second load-bearing part 3, and the connecting assembly. Apply the designed pre-tightening force using the nut on the second reinforcing member 16 to form a reliable connection between the first load-bearing part 1 and the second load-bearing part 3. Then check the installation position and connection accuracy of the first connecting plate 8, the second connecting plate 9, the first connecting sleeve 10, the first reinforcing sleeve, and the second reinforcing member 16 to ensure that each connecting component is installed accurately.

[0031] Subsequently, the second load-bearing part 2 is hoisted using hoisting equipment and placed above the first load-bearing part 1, so that the first flange plate 4 and the second flange plate 5 fit together. Align the mating holes 22 on the first flange plate 4 and the second flange plate 5, and pass the bolts through the first flange plate 4 and the second flange plate 5 in sequence. Then, connect and fix the first flange plate 4 and the second flange plate 5 with nuts. During installation, tighten the nuts in a diagonal, graded, and uniform order to apply preload force, and complete the installation and docking of the first flange plate 4 and the second flange plate 5. At the same time, check the overall verticality and installation accuracy of the first load-bearing component, so that the first load-bearing part 1 and the second load-bearing part 2 form an integral precast column.

[0032] Step S4: Install templates on the outside of the first load-bearing component and the second load-bearing component 3 to form a post-pouring zone; specifically, install templates on the periphery of the first load-bearing part 1, the second load-bearing part 2 and the second load-bearing component 3, and reinforce and seal the templates so that a closed post-pouring zone is formed between the first load-bearing part 1 and the second load-bearing component 3 (except for the channel for injecting grout 17 into the post-pouring zone, the rest of the area is closed), to prevent grout 17 from leaking during the pouring process; Step S5: Inject grout 17 into the post-casting area; specifically, inject UHPC or other types of grout 17 into the first connecting sleeve 10, so that the grout 17 fills the annular space between the first connecting sleeve 10 and the first reinforcing member 15. Then, inject grout 17 into the interior of the first connecting sleeve 10, between the first post-casting channel 6 and the first connecting channel, so that the grout 17 fully wraps the first connecting plate 8, the second connecting plate 9, the first connecting sleeve 10, the first reinforcing sleeve, and fills the first connecting sleeve 10, the first post-casting channel 6, and other spaces in the post-casting area, forming a continuous and integral grout 17 connector (the grout 17 connector refers to the grout 17 after curing in the above-mentioned area); during the grout injection process, existing equipment can be used for vibration or pressure grouting to ensure that the grout 17 is densely filled and to avoid the formation of voids and air trapping. Step S6: After the grout 17 in the post-cast area is poured and reaches initial setting, cover and moisturize it for curing, and continue curing until the design strength requirement is met. After the grout 17 in the post-cast area reaches the design strength, remove the formwork and temporary fixing devices, and re-inspect the first flange plate 4, the second flange plate 5, the bolts connecting the first flange plate 4 and the second flange plate 5, the second reinforcing member 16, and the connecting components. Conduct a visual inspection and quality acceptance of the connecting node device. Focus on checking whether the connection status and pre-tightening force of the butt hole 22 and the connecting hole 19 meet the design requirements, confirm that the connection of each connecting component is reliable, and that the grout 17 is filled densely to ensure that the first load-bearing member and the second load-bearing member 3 form an integral connection node and an integral force-bearing system, so as to achieve the coordinated force bearing of the first load-bearing member and the second load-bearing member 3, thereby completing the prefabricated reinforcement construction of the existing building.

[0033] In this document, "several" refers to at least one. "And / or" refers to text content preceding and / or following it, which can exist simultaneously or individually. For example, A and / or B includes either only A or B, or both A and B. This invention discloses multiple technical solutions, but does not provide any contrary technical teachings. Any content not covered in this invention is applicable to existing technologies.

[0034] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A connection node device for reinforcing existing buildings, characterized in that, The connection node device includes: First load-bearing component and second load-bearing component; The post-casting area includes a first post-casting channel located inside the first load-bearing component and a second post-casting channel located inside the second load-bearing component. The first post-casting channel and the second post-casting channel are sequentially arranged and connected along a first direction. A connecting assembly, the connecting assembly including a first connecting unit, the first connecting unit including a first connecting sleeve disposed along the first direction, the first end of the first connecting sleeve being located in the first post-pouring channel, the first connecting sleeve being provided with a first reinforcing member located in the first load-bearing member and the second load-bearing member, the first connecting sleeve being spaced apart from the first post-pouring channel, and the first reinforcing member being spaced apart from the first connecting sleeve; The first load-bearing component is a reinforcement structure, and the second load-bearing component is a building to be reinforced. The first direction is set from the first load-bearing member toward the second load-bearing member; The area between the first post-pouring channel and the first connecting sleeve, as well as the area between the first connecting sleeve and the first reinforcing member, are both used for pouring grout.

2. The connection node device according to claim 1, characterized in that, The connecting assembly includes a second connecting unit, the second connecting unit including a second connecting sleeve disposed along the first direction, the first end of the second connecting sleeve being located inside the first load-bearing member, and the second connecting sleeve being provided with a second reinforcing member located inside the first load-bearing member and the second load-bearing member.

3. The connection node device according to claim 2, characterized in that, The second connecting sleeve and the second reinforcing member are spaced apart.

4. The connection node device according to claim 2, characterized in that, A plurality of second connecting units are provided along the circumference of the first connecting unit; And / or, the diameter of the first connecting sleeve is greater than the diameter of the second connecting sleeve.

5. The connection node device according to claim 2, characterized in that, The first connecting sleeve is disposed through the first load-bearing component and the second load-bearing component; And / or, the second connecting sleeve is provided to pass through the first load-bearing member and the second load-bearing member; And / or, the first reinforcing member includes a first reinforcing sleeve, and / or, the second reinforcing member includes a first reinforcing rod.

6. The connection node device according to claim 2, characterized in that, The connecting assembly includes a first connecting plate and a second connecting plate spaced apart along the first direction. The first connecting plate is located on the side of the first load-bearing member away from the second load-bearing member, and the second connecting plate is located between the first load-bearing member and the second load-bearing member. The first connecting sleeve and the second connecting sleeve are both inserted into the interior of the first connecting plate and the second connecting plate, and are both fixedly connected to the first connecting plate and the second connecting plate.

7. The connection node device according to claim 6, characterized in that, The first connecting plate and the second connecting plate are embedded inside the first load-bearing component; and / or, the first connecting plate and the second connecting plate are symmetrically arranged inside the first load-bearing component.

8. The connection node device according to claim 1, characterized in that, The first load-bearing component is a precast column, the second load-bearing component is an existing column, and the first load-bearing component is located on the side of the second load-bearing component away from the existing building; And / or, the first load-bearing component includes a first load-bearing part and a second load-bearing part that are sequentially arranged and connected along the second direction, and the angle between the first direction and the second direction is A, where 0° < A ≤ 90°.

9. The connection node device according to claim 8, characterized in that, A first flange plate is provided on the outer side of the end of the first load-bearing part facing the second load-bearing part, and a second flange plate is provided on the outer side of the end of the second load-bearing part facing the first load-bearing part. The first flange plate and the second flange plate are fixedly connected.

10. A construction method for constructing the connection node device according to any one of claims 1-9, characterized in that, The construction method includes the following: Step S1: Fabricate the first load-bearing component and the connecting assembly; Step S2: Perform base treatment on the second load-bearing component. The base treatment includes removing the finishing layer and loose areas on the surface of the second load-bearing component, and roughening the area on the second load-bearing component that is connected to the first load-bearing component, cleaning up dust and debris, so that the area on the second load-bearing component that is connected to the first load-bearing component reaches the required roughness. Step S3: Use hoisting equipment to hoist the first load-bearing component to the corresponding height and align it with the corresponding area of ​​the second load-bearing component; Step S4: Install templates on the outside of the first and second load-bearing components to form the post-cast area; Step S5: Inject grout into the post-cast area; Step S6: After the grout in the post-pouring zone is poured and reaches initial setting, cover and moisturize it for curing until the design strength requirement is met. After the grout in the post-pouring zone reaches the design strength, remove the template and conduct an appearance inspection and quality acceptance of the connection node device.

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