A structure reinforced with an existing structure externally provided with a prestressed assembled concrete frame and energy dissipation support

Abstract

The present invention discloses a structure reinforced by an external prestressed assembled concrete frame-energy-absorbing support of an existing structure, including an external frame-energy-absorbing support structure fixed on the original structure to be reinforced, which includes a prefabricated beam, a prefabricated column, and a prefabricated support. The prefabricated support is prefabricated by pouring concrete with a built-in low-yield point energy-absorbing steel plate, and the prefabricated beam, prefabricated column, and prefabricated support are all reserved with connecting parts for connection; the prefabricated beam and the prefabricated column are fixedly connected to each other, and concrete is poured at the connection node. The prefabricated columns that are fixedly connected in turn are provided with penetrating prestressed tendons, and the two ends of the prestressed tendons are anchored; the external frame is composed of a plurality of external frame units, and the external frame units are provided with prefabricated supports. The present invention greatly improves the construction efficiency and reinforcement quality without affecting the use of the original structure to be reinforced.

Description

Technical Field

[0001] The invention relates to a civil engineering earthquake-resistant reinforcement structure, in particular to a structure reinforced by an existing structure externally provided with a prestressed assembled concrete frame-energy dissipation support. Background Art

[0002] The overall reinforcement of the additional substructure is to use the synergistic work of the additional overall substructure and the original structure to change the structural system of the original structure, transfer the damage to the additional substructure, thereby changing the stress state and deformation mode of the original structure, enhancing the overall seismic resistance of the structure, and thus alleviating the overall seismic demand. It is a reinforcement method for the structural system.

[0003] Existing reinforcement methods are mostly limited to component-level reinforcement, such as expanding component cross-sections, attaching steel plates, etc. The existing technology tends to reinforce components with insufficient seismic resistance in the original structure, rather than considering the overall seismic performance of the structure.

[0004] Moreover, most of the existing additional substructure reinforcements require cast-in-place operations, which have a long and complicated construction period and are difficult to guarantee the construction quality, which has lost its original advantages to a certain extent. Most of the existing additional substructures are external frames, and the use of external frame-support is rare; the existing external-support research is also mostly steel structure, and the use of steel-concrete combination is rare. Summary of the invention

[0005] Purpose of the invention: To solve the deficiencies in the prior art, the present invention provides a structure reinforced with an existing structure externally provided with a prestressed assembled concrete frame and energy-absorbing supports, which greatly improves the construction efficiency and reinforcement quality without affecting the use of the original structure to be reinforced.

[0006] Technical solution: The structure of the existing structure reinforced with an external prestressed assembled concrete frame-energy-absorbing support of the present invention comprises an external frame-energy-absorbing support structure fixed on the original structure to be reinforced; the external frame-energy-absorbing support structure comprises prefabricated beams, prefabricated columns, and prefabricated supports, the prefabricated beams are prefabricated by pouring concrete with built-in steel plates, the prefabricated columns are prefabricated by pouring concrete with built-in steel pipe-steel plate assemblies, and the prefabricated supports are prefabricated by pouring concrete with built-in low-yield point energy-absorbing steel plates, and the prefabricated beams, prefabricated columns, and prefabricated supports are all reserved with connectors for connection;

[0007] The precast beams and precast columns are fixedly connected to each other, and concrete is poured at the connection nodes to form an external frame of an external frame-energy-absorbing support structure; the external frame is composed of a plurality of external frame units, and adjacent external frame units share precast beams or precast columns, and precast columns that are fixedly connected in sequence are provided with penetrating prestressed tendons, and both ends of the prestressed tendons are anchored; precast supports are symmetrically arranged in the external frame units, and the precast supports are obliquely arranged and fixedly connected to the connection pieces reserved on the precast beams and precast columns; one end of the precast support is fixedly connected to the node where the precast beams and precast columns are connected, and the other end is fixed to the precast beam on the other side.

[0008] Among them, Q235 can be used as the low yield point energy-absorbing steel plate; the external frame is composed of a number of external frame units. When in use, the number of external frame units can be specifically increased or decreased according to the actual original structure to be reinforced, and adjacent external frame units share a prefabricated beam or prefabricated column; the cross-section of the energy-absorbing low yield point steel can be in the shape of a straight line, a cross, or a M shape; the prefabricated beams, prefabricated columns, and prefabricated supports are all equipped with connection parts that are set according to the actual connection method. For example, if two prefabricated supports are symmetrically arranged in the external frame unit, the corresponding upper prefabricated beams are equipped with two oblique steel plates, which are respectively connected to the prefabricated supports; the connection parts can be in the form of an outwardly extending connecting steel plate, and then fasteners are installed to achieve a tight connection; the external frame-energy-absorbing support structure is combined with the original structure to be reinforced through a connecting assembly; the structure reinforced by the existing structure external prestressed assembled concrete frame-energy-absorbing support of the present invention can be installed on the outer surface of the original structure, or it can be installed on the inner surface of the original structure according to actual needs.

[0009] Preferably, the cross section of the energy-dissipating low-yield point steel is cross-shaped.

[0010] Preferably, the built-in steel plates of the prefabricated beams are provided with built-in stirrups and structural steel bars, and the steel pipe-steel plate assembly of the prefabricated columns is provided with built-in stirrups and structural steel bars.

[0011] Preferably, additional stirrups are provided at the connection between adjacent prefabricated beams and prefabricated columns, and additional stirrups are provided at the connection between adjacent prefabricated columns.

[0012] Preferably, each of the external frame units is provided with two prefabricated supports.

[0013] One end of the prefabricated support is fixedly connected to a node where the prefabricated beam and the prefabricated column are connected, and the other end is fixed to a middle position of the prefabricated beam.

[0014] Preferably, the prestressed tendons pass through the steel tubes in the built-in steel tube-steel plate assembly of the prefabricated column without bonding.

[0015] Preferably, the connecting pieces between the adjacent prefabricated columns are fixedly connected by welding and fasteners; welding rods are provided between the connecting pieces between the adjacent prefabricated columns to weld and fix the connecting pieces; after welding and fixing, fasteners, additional stirrups, etc. are installed, and then concrete is poured to tightly combine.

[0016] Preferably, the external frame-energy dissipation support structure is fixedly connected to the original structure by a connection assembly, and then concrete is poured at the connection; wherein the connection assembly can be fixed on the precast beams and / or precast columns of the external frame-energy dissipation support structure, and then the connection assembly is fixedly connected to the original structure to be reinforced. That is: the precast beams and / or precast columns are fixedly provided with a connection assembly for connecting with the original structure; the external frame-energy dissipation support structure is fixedly connected to the original structure by a connection assembly, and then concrete is poured at the connection.

[0017] Preferably, the low yield point energy-absorbing steel plate and the externally poured concrete are partially non-bonded.

[0018] Among them, low-yield point energy-absorbing steel plates are used inside the prefabricated support, and the external prefabricated concrete constrains the out-of-plane buckling of the low-yield point energy-absorbing steel plates; the external frame-energy-absorbing support requires a new structural foundation, and the prestressed tendons pass through the steel pipes in the built-in steel pipe-steel plate assembly of the prefabricated column and are unbonded; the two ends of the prestressed tendons are anchored separately, one end is anchored to the prefabricated beams and prefabricated columns at the top, and the other end is anchored in the foundation at the bottom.

[0019] When the above-mentioned existing structure is actually used, the construction method of the external prestressed assembled concrete frame-energy dissipation support reinforced structure includes the following steps:

[0020] (1) Prefabricate the prefabricated beams, prefabricated columns and prefabricated supports, and reserve the required connectors according to the design requirements;

[0021] (2) Assembling and connecting precast beams, precast columns, and precast supports to form an externally attached frame including a plurality of externally attached frame units, wherein adjacent externally attached frame units share a precast beam, and precast supports are installed; wherein adjacent precast beams and precast columns are fixedly connected by connecting pieces and external fasteners, and then concrete is poured to combine them; prestressed tendons are first inserted between adjacent precast columns, and then adjacent precast columns are fixedly connected, and both ends of the prestressed tendons are anchored;

[0022] (3) The assembled external frame is then installed and fixed to the structure to be reinforced.

[0023] During the actual construction, all prefabricated components can be first fixed on the original structure to be reinforced, and then connected and fixed in pairs; the prefabricated components include prefabricated beams, prefabricated columns, prefabricated supports, connecting components, etc.

[0024] The structure of the present invention is reinforced by an external prestressed assembled concrete frame-energy dissipation support on the existing structure. The external prestressed assembled concrete frame-energy dissipation support is installed on the original structure to be reinforced, changing the stress and deformation mode of the original structure. The prefabricated frame composed of prefabricated beams and prefabricated columns and the prefabricated support provide greater lateral stiffness. The low-yield point energy dissipation soft steel plate is centralized and replaceable. The prestressed tendons realize the post-earthquake self-reset of the structure. The reinforcement method adopts the form of component prefabrication and external assembly, which does not affect the use of the original structure and greatly improves the construction efficiency and reinforcement quality. The damage of the original structure is transferred by setting a centralized energy dissipation component, and the post-earthquake repair capacity of the structure is increased by setting prestressed tendons.

[0025] Beneficial effects: Compared with the existing technology,

[0026] (1) The external frame-energy dissipation support of the present invention not only contributes to the seismic resistance of the reinforced overall structure with its own large lateral stiffness, but also improves the stress state and deformation mode of the original structure, so that the structure forms a more reasonable damage yield mechanism;

[0027] (2) All external components are prefabricated and assembled on site, and the extended steel plates at the ends and middle of the prefabricated components are convenient for two-to-two connection. The construction process is outside the structure and does not affect the use of the original structure, which greatly improves the construction efficiency, ensures the quality of the components, and enhances the reinforcement effect;

[0028] (3) The precast concrete outside the energy dissipation support restrains the out-of-plane buckling of the internal cross-shaped steel plate. The cross-shaped steel plate is made of low-yield point soft steel and is not bonded to the concrete part to enhance the energy dissipation capacity of the cross-shaped steel plate under earthquake action. The energy dissipation support concentrates energy dissipation, transfers damage to the original structure, protects the original structure, and can be replaced after an earthquake.

[0029] (4) Compared with directly setting the energy dissipation support on the original structure, the existence of the external frame of the present invention not only provides the installation position of the energy dissipation support, but also avoids the phenomenon that the node area of ​​the original structure is destroyed before the energy dissipation support;

[0030] (5) The prestressed tendons in the precast columns provide the structure with self-reset capability, enhance the recoverability of the structure, reduce the residual displacement angle of the structure, and make the structure truly repairable after an earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a rendering of an unreinforced house in the present invention;

[0032] Figure 2 It is the front view of the unreinforced house in the present invention;

[0033] Figure 3 This is a rendering of the effect of three rows of houses reinforced in the present invention;

[0034] Figure 4This is a front view of the three-row reinforced house in the present invention;

[0035] Figure 5 It is a side view of the three-row reinforced house in the present invention;

[0036] Figure 6 This is a rendering of the external frame-energy dissipation support structure in the present invention;

[0037] Figure 7 It is a front view of the external frame-energy dissipation support structure in the present invention;

[0038] Figure 8 This is an exploded view of the external prefabricated beam in the present invention;

[0039] Fig. 9 This is an exploded view of the external prefabricated column in the present invention;

[0040] Fig.10 This is an exploded view of the external and internal prefabricated support in the present invention;

[0041] Fig.11 This is an exploded view of the external prefabricated beam-column-support connection in the present invention;

[0042] Fig.12 This is a connection effect diagram of the external prefabricated beam-column-support in the present invention;

[0043] Fig.13 This is an exploded view of the external prefabricated beam-support connection in the present invention;

[0044] Fig.14 This is a rendering of the external prefabricated beam-support connection in the present invention;

[0045] Fig.15 This is an exploded view of the top floor external prefabricated beam-column connection in the present invention;

[0046] Fig.16 This is a rendering of the connection between the top-floor external prefabricated beams and columns in the present invention;

[0047] Fig.17 This is an exploded view of the external prefabricated column-column connection in the present invention;

[0048] Fig.18 This is a rendering of the connection between the external prefabricated columns in the present invention;

[0049] Fig.19 This is an exploded view of the column end extension connector of the present invention;

[0050] Fig. 20 It is an exploded view of the connection components between the original structure and the external structure in the present invention. DETAILED DESCRIPTION

[0051] The following is a detailed description with reference to the embodiments.

[0052] like Figures 1 to 7 As shown, the structure of the existing structure reinforced with an external prestressed assembled concrete frame-energy absorbing support of the present invention includes an external frame-energy absorbing support structure 2 fixed on the outer surface of the original structure 1 to be reinforced, and the external frame-energy absorbing support structure 2 is divided into three groups and fixed on the original structure 1 at equal intervals.

[0053] The external frame-energy dissipation support structure 2 includes a precast beam 3, a precast column 4, and a precast support 5. The precast beam 3 and the precast column 4 are fixedly connected to each other, and concrete is poured at the connection node to form the external frame of the external frame-energy dissipation support structure; the precast columns 4 that are fixedly connected in sequence are provided with penetrating prestressed tendons 6, and the two ends of the prestressed tendons 6 are anchored; the external frame is composed of nine external frame units, which are rectangular, and each external frame unit is symmetrically provided with two precast supports 5; the precast supports 5 are arranged obliquely to the left and right, and one end of the two precast supports 5 is respectively fixedly connected to the left and right connection nodes where the precast beam 3 and the precast column 4 are connected, and the other ends are fixed to the middle position of the precast beam 3 on the other side, and the position where the precast support 5 is fixed to the precast beam 3 is located in the middle position of the precast beam 3. In addition, the upper and lower adjacent external frame units share a precast beam 3.

[0054] Among them, the prefabricated beam 3 is prefabricated by pouring concrete 16 with the built-in steel plate 7, the prefabricated column 4 is prefabricated by pouring concrete 16 with the built-in steel pipe-steel plate assembly 23, and the prefabricated support 5 is prefabricated by pouring concrete 16 with the built-in low yield point energy-consuming steel plate 15, wherein the cross-section of the low yield point energy-consuming steel plate 15 is cross-shaped; and the prefabricated beam 3, the prefabricated column 4, and the prefabricated support 5 are all reserved with connecting parts for connection, and the connecting parts include an overhanging steel plate 8 and a column end overhanging connecting part 24, wherein the overhanging steel plate 8 includes a transverse overhanging steel plate and an oblique overhanging steel plate.

[0055] Specifically visible Figure 8 As shown, the two ends of the built-in steel plate 7 of the precast beam 3 are provided with transverse external steel plates, the middle part is provided with an oblique steel plate, the built-in steel plate 7 is provided with built-in stirrups 9 and structural steel bars 11, and the concrete 16 is precast after pouring. When pouring, the transverse external steel plate and the oblique external steel plate as the connecting parts are reserved; similarly, as Fig. 9 As shown, both ends of the steel pipe-steel plate assembly 23 of the prefabricated column 4 are provided with column end extension connectors 24, and the shape of the column end extension connectors 24 is similar to that of the steel pipe-steel plate assembly 23. A transverse extension steel plate and an oblique extension steel plate are provided below the steel pipe-steel plate assembly 23. The steel pipe-steel plate assembly 23 is provided with internal stirrups 9 and structural steel bars 11, and is prefabricated by post-cast concrete 16. The above connectors are reserved during casting. Among them, there is no oblique extension steel plate in the middle of the prefabricated beam 3 located at the bottom layer of the external frame, and there is no extension connector at the lower end of the prefabricated column 4 at the bottom layer. Fig.10 As shown, both ends of the low yield point energy absorbing steel plate 15 of the prefabricated support 5 are provided with transversely extending steel plates, and concrete 16 is poured laterally to reserve the transversely extending steel plates; the external prefabricated concrete 16 constrains the out-of-plane buckling of the low yield point energy absorbing steel plate 15, and the low yield point energy absorbing steel plate 15 and the external prefabricated concrete 16 are partially non-bonded.

[0056] like Figures 11 to 18 As shown, the precast beams 3, precast columns 4, and precast supports 5 are connected to each other through the extended steel plates 8, and the precast columns 4 are connected to the adjacent precast columns 4 through the column end extended connectors 24. The precast beams 3 and precast columns 4 on the top floor are connected to the extended connectors 24 through the extended steel plates 8. At the same time, the external frame-energy dissipation support structure 2 needs to be newly provided with a structural foundation, and the prestressed tendons 6 pass through the steel pipes in the built-in steel pipe-steel plate assembly 23 of the precast column 4, and are unbonded. The two ends of the prestressed tendons 6 are anchored separately, one end is anchored to the top precast beams 3 and precast columns 4, and the other end is anchored to the bottom foundation.

[0057] The precast beam 3 and the precast column 4 are fixedly connected by connecting steel plates 12 and high-strength bolts 14, and are provided with additional stirrups 10, and are tightly combined with the post-cast concrete 13; the precast support 5 is tightly combined with the precast beam 3 and the precast column 4 by connecting steel plates 12 and high-strength bolts 14. The extended steel plate 8, the column end extended connector 24, the connecting steel plate 12, and the column end connecting plate 25 should all be opened in advance, and the position of the hole 17 of the extended steel plate 8 corresponds to the connecting steel plate 12, and the position of the hole 17 of the column end extended connector 24 corresponds to the column end connecting plate 25.

[0058] like Figures 17 to 19 As shown, between adjacent prefabricated columns 4, welding rods 26 are first added between the upper and lower column end extension connectors 24, and the upper and lower column end extension connectors 24 are welded and fixed, and then the column end connection plates 25, bolts 22, additional stirrups 10, and then poured concrete 13 are used to tightly connect them.

[0059] Finally, the external frame-energy dissipation support 2 is connected to the original structure 1 to be reinforced through the connection component 18. Fig. 20As shown, the connection assembly 18 between the original structure 1 and the external frame-energy dissipation support 2 includes three parts, the original structure connection member 19, the external structure connection member 20, and the additional connection member 21; the original structure connection member 19 is fixedly connected to the original structure 1 by bolts 22; the external structure connection member 20 is welded to the internal steel pipe-steel plate assembly 23 of the external prefabricated column 4, and forms an integral body with the prefabricated column 4. The original structure connection member 19 and the external structure connection member 20 are tightly combined with the additional connection member 21 by bolts 22; the additional connection member 21 extends outwardly by two steel plates in the connection direction, and the gap between the steel plates allows the original structure connection member 19 and the external structure connection member 20 to be embedded; a steel plate extends outwardly from the vertical connection direction of the additional connection member 21 to increase the connection stiffness in this direction; after the connection is completed, the cast-in-place concrete 13 forms an integral body.

[0060] When the existing structure is actually used, the construction method of the prestressed assembled concrete frame-energy dissipation support reinforced structure includes the following steps:

[0061] (1) Prefabricate the prefabricated beams, prefabricated columns and prefabricated supports, and reserve the required connectors according to the design requirements;

[0062] (2) Assembling and connecting precast beams, precast columns, and precast supports to form an externally attached frame including a plurality of externally attached frame units, wherein adjacent externally attached frame units share a precast beam, and precast supports are installed; wherein adjacent precast beams and precast columns are fixedly connected by connecting pieces and external fasteners, and then concrete is poured to combine them; prestressed tendons are first inserted between adjacent precast columns, and then adjacent precast columns are fixedly connected, and both ends of the prestressed tendons are anchored;

[0063] (3) The assembled external frame is then installed and fixed to the structure to be reinforced.

[0064] The present invention can greatly improve the construction efficiency and reinforcement quality without affecting the use of the original structure 1 to be reinforced.

Claims

1. A structure of an existing structure reinforced with an external prestressed assembled concrete frame and energy dissipation support, characterized in that: It comprises an external frame-energy-absorbing support structure (2) fixed on an original structure (1) to be reinforced; the external frame-energy-absorbing support structure (2) comprises a prefabricated beam (3), a prefabricated column (4), and a prefabricated support (5); the prefabricated beam (3) is prefabricated by pouring concrete on a built-in steel plate (7); the prefabricated column (4) is prefabricated by pouring concrete on a built-in steel pipe-steel plate assembly (23); the prefabricated support (5) is prefabricated by pouring concrete on a built-in low-yield point energy-absorbing steel plate (15); the low-yield point energy-absorbing steel plate (15) and the externally poured concrete are partially non-bonded; the prefabricated beam (3), the prefabricated column (4), and the prefabricated support (5) are all provided with connection pieces reserved for connection; The precast beam (3) and the precast column (4) are fixedly connected to each other, and concrete is poured at the connection node to form an external frame of the external frame-energy-absorbing support structure; the precast beam (3) and / or the precast column (4) are fixedly provided with a connection assembly for connecting with the original structure (1); after the external frame-energy-absorbing support structure is fixedly connected to the original structure (1) by using the connection assembly, concrete is poured at the connection; the connection assembly (18) includes an original structure connection piece (19), an external structure connection piece (20), and an additional connection piece (21); the original structure connection piece (19) and the original structure (1) are fixedly connected by bolts (22); the external structure connection piece (20) is welded to the internal steel pipe-steel plate assembly (23) of the external precast column (4) and forms an integral body with the precast column (4); the original structure connection piece (19), the external structure connection piece (20) and the additional connection piece (21) are fixedly connected to each other ... and the internal steel pipe-steel plate assembly (23) of the external precast column (4) are welded to each other, and form an integral body with the precast column (4); the original structure connection piece (19), the external structure connection piece (20) and the additional connection piece (21) are fixedly connected to each other by bolts (22); the external structure connection piece (20) and the external precast column (4) are fixedly connected to each other by bolts (22); the external structure connection piece (20) and the external precast column (4) are fixedly connected to each other by bolts (22 The attached structure connector (20) is tightly connected to the additional connector (21) by bolts (22); the additional connector (21) extends two steel plates in the connection direction, and the gap between the steel plates allows the original structure connector (19) and the external structure connector (20) to be embedded; a steel plate is extended in the vertical connection direction of the additional connector (21) to increase the connection stiffness in this direction, and after the connection is completed, the cast-in-place concrete (13) forms a whole; the external frame is composed of a plurality of external frame units, and adjacent external frame units share a prefabricated beam (3) or a prefabricated column (4), and the prefabricated columns (4) that are fixedly connected in sequence are provided with penetrating prestressed tendons (6), and the two ends of the prestressed tendons (6) are anchored; the prestressed tendons (6) pass through the steel pipes in the built-in steel pipe-steel plate assembly (23) of the prefabricated column (4), and are non-bonded; Prefabricated supports (5) are symmetrically arranged in the external frame unit. The prefabricated supports (5) are obliquely arranged and fixedly connected to the connection pieces reserved on the prefabricated beams (3) and prefabricated columns (4). One end of the prefabricated support (5) is fixedly connected to the node where the prefabricated beams (3) and prefabricated columns (4) are connected, and the other end is fixed to the prefabricated beam (3) on the other side.

2. The structure of the existing structure external prestressed assembled concrete frame-energy dissipation support reinforcement according to claim 1 is characterized in that: The cross section of the low yield point energy dissipation steel plate (15) is cross-shaped.

3. The structure of the existing structure external prestressed assembled concrete frame-energy dissipation support reinforcement according to claim 1 is characterized in that: The built-in steel plate (7) of the prefabricated beam (3) is provided with built-in stirrups (9) and structural steel bars (11), and the steel pipe-steel plate assembly (23) of the prefabricated column (4) is provided with built-in stirrups (9) and structural steel bars (11).

4. The structure of the existing structure external prestressed assembled concrete frame-energy dissipation support reinforcement according to claim 1 is characterized in that: Additional stirrups (10) are provided at the connection points between adjacent prefabricated beams (3) and prefabricated columns (4), and additional stirrups (10) are provided at the connection points between adjacent prefabricated columns (4).

5. The structure of the existing structure external prestressed assembled concrete frame-energy dissipation support reinforcement according to claim 1 is characterized in that: Each external frame unit is provided with two prefabricated supports (5).

6. The structure of the existing structure external prestressed assembled concrete frame-energy dissipation support reinforcement according to claim 1 is characterized by: One end of the prefabricated support (5) is fixedly connected to a node where the prefabricated beam (3) and the prefabricated column (4) are connected, and the other end is fixed to a middle position of the prefabricated beam (3).

7. The structure of the existing structure external prestressed assembled concrete frame-energy dissipation support reinforcement according to claim 1 is characterized by: The connection pieces between adjacent prefabricated columns (4) are fixedly connected by welding and fasteners.

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