Structure for reinforcing building by externally-attached fabricated energy dissipation and shock absorption frame and design and construction method

Abstract

The invention discloses a structure of an externally-attached fabricated energy dissipation and shock absorption frame reinforced building and a design and construction method. The structure comprises an original frame to be reinforced and an externally-attached frame, the externally-attached frame comprises a prefabricated internally-grouted U-shaped steel column, a cantilever section I-shaped steel beam, a middle section I-shaped steel beam and a beam suspension connecting joint, and the prefabricated internally-grouted U-shaped steel column is connected with the column side of the original frame; the cantilever section I-shaped steel beam is connected with the prefabricated internally-grouted U-shaped steel column and the middle section I-shaped steel beam; the beam suspension connecting joint comprises an inverted suspension connecting piece and a damping energy dissipation piece, the inverted suspension connecting piece is connected with the upper flange of the cantilever section I-shaped steel beam and the upper flange of the middle section I-shaped steel beam, and the damping energy dissipation piece comprises a connecting plate, a friction plate and a spring clamping mechanism. The spring clamping mechanism is used for clamping the cantilever section I-shaped steel beam after the outer connecting plate slides by a set distance relative to the cantilever section I-shaped steel beam. According to the invention, the double functions of shock resistance and shock absorption of the external attachment structure can be integrated.

Description

Technical Field

[0001] The present invention relates to the technical field of earthquake-resistant reinforcement of civil engineering, and in particular to a structure and a design and construction method for reinforcing an existing building by using an externally attached assembled energy dissipation and shock absorption frame. Background Art

[0002] Since the houses were built over a long period of time, there are problems such as low design standards, low material strength, insufficient integrity, and chaotic construction methods, which pose certain building safety risks. Therefore, the focus of the renovation of old residential areas is the internal structural renovation and external environmental renovation, that is, the internal structural safety upgrade and the repair and renovation of the exterior. Therefore, it is urgent to conduct performance evaluation and corresponding reinforcement and renovation of the existing structure to extend its service life and improve its use function and service capacity.

[0003] Additional integral substructure reinforcement is to use the synergistic work of the additional integral substructure and the original structure to enhance the overall seismic resistance of the original structure, or change the structural system of the original structure, thereby improving the stress state and deformation mode of the original structure, thereby improving the overall seismic performance of the structure. It is a reinforcement method for the structural system. Compared with traditional component reinforcement, additional substructure reinforcement has excellent seismic reinforcement effect. By changing the structural form, it further enhances the integrity of the existing structure, making its structural strength and stiffness more uniform. At the same time, since the construction is an external operation, "non-disturbance reinforcement" can be achieved, which does not affect the normal use of the structure. It is also of great practical significance and social benefits for buildings such as schools, hospitals, and community residential buildings that cannot interrupt operations or residences.

[0004] Traditional external attachment structure reinforcement technology usually adopts a connection scheme along the full length of the column and the full length of the beam for the connection between the external attachment structure and the existing concrete structure. It only realizes the seismic function of the external attachment structure but lacks energy dissipation and shock absorption and is not conducive to achieving post-earthquake recoverable performance.

[0005] Traditional external substructure reinforcement technology uses diagonal braces as additional energy-absorbing components of the external substructure, which will affect the building facade and door and window settings. The installation of diagonal energy-absorbing supports often occupies part of the building's exterior space. Especially when these supporting structures are dense or large in size, they may block some natural light from entering the building, thereby affecting the indoor lighting effect. At the same time, as new elements on the exterior of the building, the shape, size, color, etc. of the external substructure and the energy-absorbing supports on it will affect the overall appearance of the building.

[0006] Traditional external reinforcement structures will inevitably enter an elastic-plastic state under major earthquakes and are difficult to repair quickly. In addition, they lack a multi-level energy dissipation mechanism and are unable to cope with earthquakes of different intensities.

[0007] At the same time, traditional external attached structure reinforcement technology mostly uses implanted reinforcement method or chemical (mechanical) anchor method when dealing with the connection between the external attached structure and the original structure. The external attached structure and the original structure mainly use the shear resistance of steel bars or anchor bolts to transmit shear force. However, existing studies have found that before the failure of the external attached structure or the original structure, the steel bars or anchor bolts at the connection will produce bonding and slippage failure or local extrusion to form vertebral shear failure, which results in the reinforcement performance of the external attached structure cannot be fully utilized.

[0008] The external attached structure and the original structure are transmitted through the shear force at the interface between the external attached structure and the existing structure concrete. The traditional external attached structure uses rectangular columns, and its torsion center is located at the intersection of the diagonals, which causes the interface shear force to produce additional torque, which has an adverse effect on the working performance of the substructure. Existing studies have found that the frame columns in the external attached structure using rectangular columns have a significant torsion effect, and the torsional damage of the frame columns in the external attached structure is the main reason for the failure of the external attached structure. Summary of the invention

[0009] In order to solve at least one of the problems existing in the prior art, the present invention provides a structure and a design and construction method for reinforcing an existing building with an external assembled energy dissipation and shock absorption frame, which can not only greatly improve the strength and rigidity of the original structure, but also realize the factory processing and on-site splicing industrial construction method of the additional energy dissipation and shock absorption frame, and does not affect the normal use of the structure during on-site construction; by utilizing the upper rotation deformation mechanism of the steel beam based on the fracture to drive the lower friction component to dissipate energy to realize the dual functions of earthquake resistance and shock absorption of the external substructure, the damage of the external frame is mainly concentrated at the energy consumption nodes, and only the damping energy dissipation parts need to be replaced, and the post-earthquake repair speed is fast and the repair cost is low; by adopting Energy-absorbing devices are directly implanted on the external attached structure to eliminate the impact of additional energy-absorbing diagonal braces on the building facade; by adopting multi-level friction energy absorption in the shock absorption of the external attached structure, graded and progressive energy absorption can be achieved to cope with earthquakes of different intensity levels; by using high-strength bolts to connect the steel column and the existing concrete structure, the friction of the entire contact surface can evenly transmit force to avoid interface slip between the two and splitting damage between the reinforcement and concrete due to local extrusion, thereby achieving good coordination between the two; by adopting U-shaped steel section steel columns, the field cleverly utilizes the characteristic that the torsional center of the U-shaped steel is located on the outside of the web to avoid the adverse effects of additional torque generated by the shear force at the interface between the steel column and the existing structure concrete.

[0010] In order to achieve the purpose of the present invention, the structure of the externally attached assembled friction energy dissipation frame reinforced building provided by the present invention comprises an original frame to be reinforced and an externally attached frame; The external attached frame includes a prefabricated internal grouting U-shaped steel column, a cantilever section I-shaped steel beam, an intermediate section I-shaped steel beam and a beam suspension connection node. The prefabricated internal grouting U-shaped steel column is used to connect with the frame column of the original frame. When connected, only the frame column of the original frame is connected to the prefabricated internal grouting U-shaped steel column of the external attached frame; one end of the cantilever section I-shaped steel beam is connected to the prefabricated internal grouting U-shaped steel column, and the other end is connected to the intermediate section I-shaped steel beam through the beam suspension connection node; The beam suspension connection node includes an inverted suspension connection piece and a damping energy dissipation piece, the inverted suspension connection piece connects the upper flange of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam, the damping energy dissipation piece includes a connection plate, a friction plate and a spring clamping mechanism, the connection plate includes an inner connection plate and an outer connection plate, the inner connection plate and the outer connection plate are located on both sides of the lower flange of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam, and between the cantilever section I-shaped steel beam and the inner connection plate, between the cantilever section I-shaped steel beam and the outer connection plate, The friction plates are arranged between the middle section I-shaped steel beam and the inner connecting plate, and between the middle section I-shaped steel beam and the outer connecting plate. The spring locking mechanism is arranged on the outer connecting plate, which is used to clamp the cantilever section I-shaped steel beam after the outer connecting plate slides a set distance relative to the cantilever section I-shaped steel beam along the length direction of the cantilever section I-shaped steel beam. The beam suspension connection node utilizes the rotation deformation mechanism of the inverted suspension connection part of the steel beam based on the upper part of the fracture to drive the damping energy-absorbing part located at the lower part to realize energy dissipation.

[0011] As a further improvement of the structure of the present invention, a grouting joint is left between the external frame and the original frame to be reinforced, the prefabricated internal grouting U-shaped steel column of the external frame is connected to the frame column of the original frame by anchor bolts and grouting material is poured into the grouting joint.

[0012] Preferably, a grouting joint of 10mm to 20mm is left between the external frame and the original frame to be reinforced. After the anchor bolts are connected, cement mortar is used to seal the joint and the mixed grouting material is poured into the grouting joint. The grouting material is a high-strength non-shrinkage grouting material. Since the grouting material has strong fluidity and excellent self-compacting properties, all gaps can be filled without stirring after the grouting material is poured in.

[0013] As a further improvement of the structure of the present invention, the prefabricated internally grouted U-shaped steel column and the cantilever section I-shaped steel beam are connected by welding.

[0014] The vertical center axis of the connecting side of the prefabricated internal grouting U-shaped steel column is aligned with the center axis of the cantilever section I-shaped steel beam.

[0015] As a further improvement of the structure of the present invention, a first anchor hole is provided on the frame column of the original frame; The prefabricated internal grouting U-shaped steel column includes a U-shaped steel and an embedded sleeve, a second anchor hole is arranged on the web of the U-shaped steel, and the second anchor hole can be aligned with the first anchor hole; the embedded sleeve is aligned with the first anchor hole and fixedly arranged, and both sides of the embedded sleeve are connected to the U-shaped steel through stiffening ribs, and pouring holes are arranged on the stiffening ribs; bolts are arranged on the flange of the U-shaped steel; and an embedded grouting pipe is embedded on the prefabricated internal grouting U-shaped steel column.

[0016] As a further improvement of the structure of the present invention, the second anchor holes are arranged in a staggered manner along the length direction of the column; the second anchor holes are arranged in alignment with the first anchor holes set on the original frame to be reinforced; the second anchor holes should be arranged appropriately densely in the area near the beam-column node. The stiffening ribs provided include wide-side stiffening ribs and the narrow-side stiffening ribs.

[0017] As a further improvement of the structure of the present invention, the embedded sleeve is aligned with the second anchor hole arranged on the web of the U-shaped steel and is welded and fixed; the wide-side stiffening ribs and the narrow-side stiffening ribs are aligned with the embedded sleeve and arranged parallel to the cross-section of the column, and are welded and fixed with the embedded sleeve and the U-shaped steel; the arrangement of the wide-side stiffening ribs and the narrow-side stiffening ribs not only considers the stability of the structure, but also takes into account the transmission of the compression force of the anchor bolts and the performance of the U-shaped steel in bearing horizontal shear force.

[0018] As a further improvement of the structure of the present invention, the studs are welded and fixed on the flange of the U-shaped steel and arranged along the column height direction, and should be appropriately densely arranged in the area near the beam-column node; the function of the studs is to strengthen the connection strength and stability between the internal grouting material and the U-shaped steel. Specifically, the studs play a key role in this structure, penetrating the grouting material layer and forming a strong mechanical connection with the U-shaped steel, thereby ensuring a tight connection between the two.

[0019] As a further improvement to the structure of the present invention, the embedded slurry pipe should be embedded in the lowest side of the prefabricated internal grouting U-shaped steel column, one side of the embedded slurry pipe protrudes along the pouring hole, and the other side protrudes from the U-shaped steel casting surface.

[0020] As a further improvement of the structure of the present invention, during pouring, the opening surface of the U-shaped steel faces upward, the pouring holes on the widest side stiffening ribs are sealed, and the high-strength non-shrinkage grouting material is poured into a partition of the U-shaped steel. The grouting material is poured along the pouring hole into all the partitions of the U-shaped steel. After the grouting material is poured, effective maintenance measures should be taken in time according to the construction technical plan. After the maintenance is completed, the production of the prefabricated internal grouting U-shaped steel column is completed.

[0021] As a further improvement of the structure of the present invention, when at least two prefabricated internal grouting U-shaped steel columns are provided, the upper and lower adjacent prefabricated internal grouting U-shaped steel columns are connected by a column grouting connection node, that is, a plurality of the prefabricated internal grouting U-shaped steel columns are connected by a column grouting connection node along the column height direction.

[0022] As a further improvement of the structure of the present invention, the web connecting plate is fitted and connected with the inner side of the web at the lower end of the upper prefabricated internal grouting U-shaped steel column and the inner side of the web at the upper end of the lower prefabricated internal grouting U-shaped steel column and welded and fixed; the web connecting plate is aligned with the central axis of the web of the prefabricated internal grouting U-shaped steel column; the upper prefabricated internal grouting U-shaped steel column and the lower prefabricated internal grouting U-shaped steel column have the same cross-sectional size and the central axes are aligned.

[0023] As a further improvement of the structure of the present invention, after the upper prefabricated internal grouting U-shaped steel column is connected and fixed with the lower prefabricated internal grouting U-shaped steel column, a closing plate is used to close the opening surface of the column grouting connection node, and a grouting hole is arranged near the lower end of the closing plate; the upward grouting method is adopted to grout from the grouting hole arranged at the lower end of the closing plate, and the third grouting material adopts high-strength non-shrinkage grouting material. When the third grouting material is discharged from the embedded grouting pipe on the upper prefabricated internal grouting U-shaped steel column, it means that the column grouting connection node is completely filled. After the grouting material is filled, the grouting hole and the embedded grouting pipe are closed; after the third grouting material is poured, effective maintenance measures should be taken in time according to the construction technical plan, and the construction of the column grouting connection node is completed after the maintenance.

[0024] After completing the construction of the column grouting connection node, the anchor bolts are tightened again so that the original frame to be reinforced and the external frame and the grouting material therebetween fit tightly together to increase the friction between their interfaces so as to transfer the shear force between the original frame to be reinforced and the external frame.

[0025] As a further improvement of the structure of the present invention, the prefabricated internal grouting U-shaped steel column includes a U-shaped steel, the torsion center of the U-shaped steel is located on the outside of the web, the U-shaped steel includes a web and a flange, the column grouting connection node includes a web connecting plate and a flange connecting plate, the webs of the two prefabricated internal grouting U-shaped steel columns are connected by a web connecting plate, and the flanges are connected by a flange connecting plate.

[0026] As a further improvement of the structure of the present invention, a third mounting hole is arranged on the flanges at both ends of the U-shaped steel; the column grouting connection node includes a web connecting plate and a flange connecting plate; the flange connecting plate includes an inner flange connecting plate and an outer flange connecting plate; a fourth mounting hole is arranged on the inner flange connecting plate; a fifth mounting hole is arranged on the outer flange connecting plate; screws pass through the fourth mounting hole, the third mounting hole and the fifth mounting hole to connect and fix the inner flange connecting plate, the U-shaped steel and the outer flange connecting plate.

[0027] As a further improvement of the structure of the present invention, a first locking hole is provided on the lower flange of the cantilever section I-shaped steel beam, and a second locking hole is provided on the outer connecting plate, and there is a set distance between the first locking hole and the second locking hole; The spring locking mechanism is located on the second locking hole, and includes a locking piece and a spring. When the outer connecting plate does not slide relative to the I-shaped steel beam of the cantilever section, the locking piece in the spring locking mechanism is pressed on the I-shaped steel beam of the cantilever section under the action of the spring. When the outer connecting plate slides a set distance relative to the I-shaped steel beam of the cantilever section along the length direction, the locking piece is locked into the first locking hole on the I-shaped steel beam of the cantilever section under the action of the spring.

[0028] As a further improvement of the structure of the present invention, when the outer connecting plate slides a set distance relative to the cantilever section I-shaped steel beam and then clamps the cantilever section I-shaped steel beam through the spring clamping mechanism, the function of double-stage friction energy dissipation is achieved.

[0029] When the connecting plate slides a set distance relative to the first-order energy dissipation section along the length direction of the energy dissipation section, the first-order energy dissipation section is clamped by the spring clamping mechanism, and the two energy dissipation sections are isolated and set into two parts, realizing the function of double-order friction energy dissipation. Therefore, under normal use load or large use load, the damping energy dissipation part provides additional stiffness for the structure; under small earthquake, the first-order energy dissipation section slides and consumes energy; under medium and large earthquake, the first-order energy dissipation section slides and consumes energy when the interlayer displacement is small, and when the interlayer displacement is large, the first-order energy dissipation section slides to the maximum set distance and is clamped by the spring clamping mechanism, and the second-order energy dissipation section generates sliding work to consume the energy input by the earthquake, providing greater additional damping for the structure and reducing the structural response. The two energy dissipation sections are set with different friction forces and clamping devices to realize the functions of providing additional stiffness for the structure without sliding under normal use, first-order energy dissipation under small earthquakes, and second-order energy dissipation under medium and large earthquakes.

[0030] As a further improvement of the structure of the present invention, the friction coefficient is changed by changing the material of the friction plate between the cantilever section I-shaped steel beam and the inner connecting plate and the outer connecting plate, and the friction plate between the middle section I-shaped steel beam and the inner connecting plate and the outer connecting plate, so as to provide different friction forces without adjusting the structural dimensions, thereby reducing the amount of specimen processing work. The cantilever section I-shaped steel beam is a first-order energy dissipation section, and the middle section I-shaped steel beam is a second-order energy dissipation section. The minimum friction force required for sliding energy dissipation in the first-order energy dissipation section is less than that in the second-order energy dissipation section; therefore, a device with a double-order sliding friction force can be formed in the above manner.

[0031] As a further improvement of the structure of the present invention, the friction plate includes a first friction plate, a second friction plate, a third friction plate and a fourth friction plate. The first friction plate is fitted between the inner connecting plate and the I-shaped steel beam of the cantilever section, the second friction plate is fitted between the outer connecting plate and the I-shaped steel beam of the cantilever section, the third friction plate is fitted between the inner connecting plate and the middle section I-shaped steel beam, and the fourth friction plate is fitted between the outer connecting plate and the middle section I-shaped steel beam.

[0032] As a further improvement of the structure of the present invention, the damping energy dissipation member can adopt various energy dissipation forms such as friction energy dissipation, soft steel energy dissipation, and viscous damping energy dissipation.

[0033] As a further improvement of the structure of the present invention, the cantilever section I-shaped steel beam is located between the prefabricated internal grouting U-shaped steel column and the middle section I-shaped steel beam, and the central axes of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam are aligned, and the cross-sectional dimensions of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam are the same.

[0034] As a further improvement of the structure of the present invention, the inverted suspension connectors are arranged on the inner sides of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam; the inverted suspension connectors are symmetrically arranged along the central plane of the web of the I-shaped steel.

[0035] As a further improvement of the structure of the present invention, the cantilever section I-shaped steel beam is provided with a first mounting hole and a first clamping hole; the middle section I-shaped steel beam is provided with a second mounting hole; The inner connecting plate is provided with a seventh mounting hole, and the outer connecting plate is provided with a sixth mounting hole. The screws pass through the seventh mounting hole, the sixth mounting hole and the first mounting hole, so that the inner connecting plate and the outer connecting plate can be connected and fixed to the cantilever section I-shaped steel beam; the screws pass through the seventh mounting hole, the sixth mounting hole and the second mounting hole, so that the inner connecting plate and the outer connecting plate can be connected and fixed to the middle section I-shaped steel beam; the strip hole is aligned with the center of the circular hole; the inner connecting plate is symmetrically arranged along the center plane of the web of the I-shaped steel; The first mounting hole and the second mounting hole are bar holes, the seventh mounting hole and the sixth mounting hole are circular holes, or the seventh mounting hole and the sixth mounting hole are bar holes, the first mounting hole and the second mounting hole are circular holes; the length direction of the bar hole is parallel to the length direction of the energy absorbing section.

[0036] The present invention also provides a design and construction method for strengthening the structure of a building by an externally attached assembled energy dissipation and shock absorption frame, comprising the following steps: Prefabricated components are processed and manufactured in the factory, including: cantilever I-shaped steel beams, middle I-shaped steel beams, prefabricated internal grouting U-shaped steel columns and beam suspension connection nodes; Complete the anchor bolt drilling on the original frame; Transporting prefabricated components to the construction site; Positioning and installing a span of an external frame at the beam suspension connection node between the cantilever section I-shaped steel beam and the middle section I-shaped steel beam, aligning the central axis of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam, fixing the upper flanges of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam with an inverted suspension connector, connecting the lower flanges of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam through an inner (outer) connection plate and bolts, and providing a friction plate at the contact surface between the inner (outer) connection plate and the lower flange of the I-shaped steel beam; Cast the foundation on site, hoist the external frame, install and position it so that the anchor holes on the prefabricated internal grouting U-shaped steel columns are aligned with the anchor bolts on the frame columns of the original frame to be reinforced, adjust its position so that it can fit closely against the cantilever beam of the reinforced structure, and install a temporary bracket between the reinforced structure and the external frame; adjust the external frame so that there is a gap for grouting joints between the contact surfaces of the columns, and cast the lower column feet of the external frame in the cast-in-place foundation; after the anchor bolts are connected, seal the joints with cement mortar and pour the mixed grouting material into the grouting joints.

[0037] Compared with the prior art, the present invention can at least achieve the following beneficial effects: 1. The externally attached assembled energy dissipation and shock absorption frame of the present invention reinforces the structure of the existing building. The external attached structure is connected to the existing concrete structure only between the columns. Compared with the full-length beam connection scheme of the traditional technology, it can effectively release the deformation constraint of the existing structural concrete beam on the external attached structure steel beam, and use the steel beam to drive the lower friction component to consume energy based on the upper rotation deformation mechanism of the fracture, so as to realize the dual functions of earthquake resistance and shock absorption of the external attached structure. It is precisely this functional change that makes it unnecessary to set the diagonal brace as an additional energy-absorbing component for the external attached structure. The external attached structure itself can resist earthquakes and absorb shocks. By setting the beam suspension connection node, the seismic energy is concentrated here and the energy is consumed by the damping energy-absorbing parts, so as to reduce the seismic response of the structure and control the damage position. After encountering a major earthquake, the damage of the steel frame is mainly concentrated at the energy-consuming nodes. Only the damping energy-absorbing parts need to be replaced, and other components can continue to be used. The post-earthquake repair speed is fast and the repair cost is low.

[0038] 2. The external assembled energy dissipation and shock absorption frame of the present invention reinforces the structure of the existing building. The energy dissipation device is directly implanted on the external attached structure, which can avoid the influence of the additional energy dissipation diagonal brace on the building facade, does not affect the door and window settings of the original building, and minimizes the influence on the original building's use function. It not only realizes the energy dissipation and shock absorption function of the external frame, but also will not affect the indoor lighting effect too much. The facade effect can also be guaranteed by decorating the facade of the external frame; avoiding the influence of the lighting and the overall appearance of the building caused by the setting of the oblique energy dissipation support.

[0039] 3. The externally attached assembled energy dissipation and shock absorption frame of the present invention is used to reinforce the structure of the existing building. By adopting multi-level friction energy dissipation in the shock absorption of the external attached structure, it can realize graded and progressive energy dissipation in response to earthquakes of different intensity levels. Before friction sliding, the strength and stiffness of the external attached structure cooperate with the existing structure to resist earthquakes. After a small earthquake, the first-order friction sliding is used to consume the earthquake energy. In the case of a large earthquake, the second-order friction sliding energy dissipation is used to prevent the external attached structure from entering plasticity. After the earthquake, the high-strength bolt pre-tightening force of the friction component is released, and the elastic restoring force of the external attached structure column is used to realize the rapid resetting of the substructure. The present invention sets the cantilever section I-shaped steel beam as a first-order energy dissipation section, and the middle section I-shaped steel beam as a second-order energy dissipation section. The minimum friction force required for the sliding energy dissipation of the first-order energy dissipation section is less than that of the second-order energy dissipation section. Therefore, a device with a double-order sliding friction force can be formed in the above manner. The two energy-absorbing sections are provided with different friction forces and locking devices to ensure that the damping energy-absorbing parts do not slide under normal use to provide additional stiffness for the structure, and to dissipate energy in the first order under small earthquakes and in the second order under medium or large earthquakes.

[0040] 4. The structure of the external assembled energy dissipation and shock absorption frame reinforced building of the present invention can adopt high-strength bolt connection between steel columns and existing concrete structures, and utilize the pre-tightening force between steel and concrete to generate friction force to realize the interface shear force transmission between the two. Compared with the traditional technology of anchor bar embedding which directly transmits the interface shear force through the anchor bar shear resistance mode (lack of interface friction force), it is helpful to avoid the interface slip between the two. Moreover, the uniform force transmission through the friction of the entire contact surface can avoid the cone shearing / splitting damage between the reinforcement and concrete due to local extrusion, effectively improve the stress performance of the interface, and realize the good coordinated work of the two.

[0041] 5. In the structure of the external assembled energy dissipation and shock absorption frame reinforced building of the present invention, the steel column part can adopt a U-shaped steel cross-section, thereby cleverly utilizing the characteristic that the torsion center of the U-shaped steel is located outside the web, avoiding the adverse effect of the additional torque generated by the shear force at the interface between the steel column and the existing structural concrete; the U-shaped steel of the steel column part can also serve as a template for concrete pouring.

[0042] 6. The external assembled energy dissipation and shock absorption frame of the present invention reinforces the structure of the building, combines the additional frame with the original structure through effective measures, forms a new overall structure, and improves the seismic resistance of the overall structure. The external frame can contribute to the seismic resistance of the reinforced overall structure with its own seismic bearing capacity and energy dissipation capacity. Compared with traditional component reinforcement, the additional substructure reinforcement has a superior seismic reinforcement effect. By changing the structural form, the integrity of the existing structure is further enhanced, making its structural strength and stiffness more uniform.

[0043] 7. The structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building of the present invention, the beams and columns of the externally attached frame can be prefabricated in the factory or on the construction site, less wet work on site, less pollution to the environment, control of construction quality, and improved construction efficiency. The reinforcement work is completed on the outside of the building, does not damage the internal decoration of the building, does not affect the activities inside the building, can achieve "non-disturbance reinforcement", does not affect the normal use of the structure, and has important practical significance and social benefits for buildings such as schools, hospitals, and community residential buildings where operations or residences cannot be interrupted. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A three-dimensional structural schematic diagram of the structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building provided by the present invention; Figure 2 A plan view of the structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building provided by the present invention; Figure 3 A schematic diagram of the three-dimensional structure of an original frame to be reinforced in the structure of a building reinforced with an externally attached assembled energy dissipation and shock absorption frame provided by the present invention; Figure 4 for Figure 2 Schematic diagram of the three-dimensional structure of the beam suspension connection node in the structure of the external assembled energy dissipation and shock absorption frame reinforcement building; Figure 5 for Figure 2 A plan view of the beam suspension connection node in the structure of the building reinforced with an external assembled energy dissipation and shock absorption frame; Figure 6 for Figure 2 Left view of the suspension connection node of the structural beam of the building reinforced with an external assembled energy dissipation and shock absorption frame; Figure 7 for Figure 4 Schematic diagram of the three-dimensional structure of the structure of the building reinforced with an external assembled energy dissipation and shock absorption frame after the beam suspension connection node is decomposed; Figure 8 for Figure 5 The exploded plan view of the beam suspension connection node in the structure of the building reinforced with an external assembled energy dissipation and shock absorption frame; Fig. 9 for Figure 6 Left side view of the exploded suspension connection node of the structural beam of the building reinforced with an external assembled energy dissipation and shock absorption frame; Fig.10 A plan view and a BB-direction cross-sectional view of the spring locking mechanism (not popped out) after the structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building provided by the present invention is installed; Fig.11 A plan view and a CC-direction cross-sectional view of a spring locking mechanism (pop-up) after the structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building provided by the present invention is installed; Fig.12 for Figure 2 Schematic diagram of the three-dimensional structure of the prefabricated internally grouted U-shaped steel column in the structure of the externally attached assembled energy dissipation and shock absorption frame reinforcement building; Fig.13 for Figure 2 Plan view of prefabricated internally grouted U-shaped steel columns in the structure of the externally attached assembled energy dissipation and shock absorption frame reinforcement building; Fig.14 for Figure 2 Left view of the prefabricated internally grouted U-shaped steel column in the structure of the externally attached assembled energy dissipation and shock absorption frame to strengthen the building; Fig.15 A schematic diagram of the three-dimensional structure of the exploded grouting connection nodes of the structural center columns of the externally attached assembled energy dissipation and shock absorption frame reinforced building provided by the present invention; Fig.16 This is a plan view of the exploded grouting connection nodes of the structural center columns of the externally attached assembled energy dissipation and shock absorption frame reinforced building provided by the present invention.

[0045] Icon: 1-Original frame to be reinforced: 11-First anchor hole; 2-External attached frame: 21-Cantilever section I-shaped steel beam, 211-First mounting hole; 212-First positioning hole, 22-Middle section I-shaped steel beam, 221-Second mounting hole, 23-Prefabricated internal grouting U-shaped steel column, 231-U-shaped steel, 2311-Third mounting hole, 2312-Second anchor hole, 232-Embedded sleeve, 233-Embedded grouting pipe, 234-Stud, 235-Wide side stiffening rib, 2351-Pouring hole, 236-Narrow side stiffening rib, 237-Second grouting material, 24-Web connecting plate, 25-Flange connecting plate, 251-Flange internal connecting plate Connecting plate, 2511-fourth mounting hole, 252-flange outer connecting plate, 2521-fifth mounting hole, 26-inverted suspension connecting piece, 27-connecting plate, 271-inner connecting plate, 2711-seventh mounting hole, 272-outer connecting plate, 2721-sixth mounting hole, 2722-second locking hole, 28-friction plate, 281-first friction plate, 282-second friction plate, 283-third friction plate, 284-fourth friction plate, 29-spring locking mechanism, 291-locking piece, 292-spring, 293-welding fixing piece; 3-anchor bolt; 4-first grouting material; 5-closing plate; 51-grouting hole. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and marked in the drawings can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0049] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0050] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0052] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] The structure and design and construction method of the externally attached assembled energy dissipation and shock absorption frame reinforced building of the present invention can not only combine the additional frame with the original structure through effective measures to form a new overall structure, thereby improving the earthquake resistance of the overall structure; it can also realize the industrialized construction method of factory processing and on-site splicing of the steel support frame structure; and the reinforcement work is completed outside the building, without damaging the interior decoration of the building, without affecting the activities inside the building, and can achieve "non-disturbance reinforcement" without affecting the normal use of the structure; through the double-order damping energy-absorbing parts, it is realized that the structure does not slide under normal use to provide additional stiffness, and the first-order damping under small earthquakes is realized. Energy dissipation, it has the function of second-order energy dissipation under medium or large earthquakes; after a large earthquake, the damage of the steel frame is mainly concentrated at the energy dissipation nodes, and only the damping energy dissipation parts need to be replaced, so the post-earthquake repair speed is fast and the repair cost is low; by setting the damping energy dissipation parts at the beam suspension connection nodes, it will not affect the indoor lighting effect too much, nor will it affect the space outside the building; by tightening the anchor bolts again, the friction between the original frame to be reinforced and the external frame and the grouting material in between can be increased to transmit shear force, and the possibility of bonding and slippage damage of the anchor bolts at the connection can be reduced as much as possible, so that the reinforcement performance of the external attached structure can be fully utilized.

[0054] like Figures 1 to 16 As shown, the structure of the externally attached assembled friction energy dissipation frame reinforced building provided by the present invention includes an original frame 1 to be reinforced, an externally attached frame 2 and anchor bolts 3.

[0055] A first anchor hole 11 is provided on the frame column of the original frame 1 to be reinforced; the external frame 2 includes a cantilever section I-shaped steel beam 21, an intermediate section I-shaped steel beam 22, a prefabricated internal grouting U-shaped steel column 23, a beam hanging connection node and a column grouting connection node.

[0056] In one embodiment of the present invention, the frame column of the original frame 1 to be reinforced is connected to the prefabricated internal grouting U-shaped steel column 23 of the external frame 2 by means of anchor bolts 3, the prefabricated internal grouting U-shaped steel column 23 is connected to the cantilever section I-shaped steel beam 21 by welding, the cantilever section I-shaped steel beam 21 is connected to the middle section I-shaped steel beam 22 by means of a beam suspension connection node, and when two or more prefabricated internal grouting U-shaped steel columns 23 are arranged along the column height direction, the prefabricated internal grouting U-shaped steel columns 23 are connected along the column height direction by means of column grouting connection nodes.

[0057] In one embodiment of the present invention, a grouting joint of 10mm to 20mm is left between the external frame 2 and the original frame 1 to be reinforced. After the anchor bolts 3 are connected, cement mortar is used to seal the joint and the mixed first grouting material 4 is poured into the grouting joint. The external attachment structure is connected to the existing concrete structure only between the columns. Compared with the full-length beam connection scheme of the traditional technology, it can effectively release the deformation constraint of the existing structural concrete beam on the external attachment structure steel beam, so as to utilize the upper rotation deformation mechanism of the steel beam based on the fracture to drive the lower friction component to consume energy.

[0058] In one embodiment of the present invention, the first grouting material 4 is a high-strength non-shrinkage grouting material (existing grouting material). Since the first grouting material 4 has strong fluidity and excellent self-compacting properties, all gaps can be filled without stirring after the first grouting material 4 is poured in. In addition, maintenance measures are taken in time according to the construction technical plan.

[0059] In one embodiment of the present invention, the vertical center axis of the connecting side of the prefabricated internal grouting U-shaped steel column 23 is aligned with the center axis of the cantilever section I-shaped steel beam 21.

[0060] In one embodiment of the present invention, the cantilever section I-shaped steel beam 21 is provided with a first mounting hole 211 and a first positioning hole 212 ; the middle section I-shaped steel beam 22 is provided with a second mounting hole 221 .

[0061] In one embodiment of the present invention, the prefabricated internal grouting U-shaped steel column 23 includes a U-shaped steel 231, an embedded sleeve 232, an embedded grouting pipe 233, a bolt 234, a wide-side stiffening rib 235, a narrow-side stiffening rib 236, and a second grouting material 237; the flanges at both ends of the U-shaped steel 231 are provided with a third mounting hole 2311, and the web is provided with a second anchor hole 2312, and the second anchor hole 2312 is aligned with the first anchor hole 11 provided on the original frame 1 to be reinforced; the embedded sleeve 232 is aligned with the second anchor hole 2312 provided on the web of the U-shaped steel 231 and is welded and fixed, and the embedded sleeve 232 is staggered along the column height direction to avoid the development of cracks; the wide-side stiffening rib 235 is provided with a pouring hole 2351; the wide-side stiffening rib 235 and the narrow-side stiffening rib 236 are aligned with the embedded sleeve 232 It is arranged parallel to the cross section of the column and is welded and fixed to the embedded sleeve 232 and the U-shaped steel 231. By setting the stiffening ribs, it can not only resist the horizontal shear force brought by the anchor bolts, but also disperse the pressure of the anchor bolts on the embedded sleeves to act on the U-shaped steel web, so as to prevent the concentrated force on the U-shaped steel web from being too large due to the embedded sleeves; the studs 234 are welded and fixed to the flange of the U-shaped steel 231 and are arranged along the column height direction. Preferably, they are appropriately densely arranged in the area near the beam-column node. By setting the studs 234, the integrity between the U-shaped steel 231 and the internal hardened grouting material can be strengthened to prevent interface slip; the embedded grouting pipe 233 is embedded in the lowermost side of the prefabricated internal grouting U-shaped steel column 23, one side of the embedded grouting pipe 233 protrudes along the pouring hole 2351, and the other side protrudes from the casting surface of the U-shaped steel 231.

[0062] During pouring, the opening surface of the U-shaped steel 231 faces upward, and the pouring holes 2351 on the wide side stiffening ribs 235 on the two sides are sealed. The second grouting material 237 is injected into a partition of the U-shaped steel 231. The second grouting material 237 is poured along the pouring hole 2351 into all the partitions of the U-shaped steel 231. After the grouting material is poured, effective maintenance measures are taken according to the construction technical plan. After the maintenance is completed, the production of the prefabricated internal grouting U-shaped steel column 23 is completed.

[0063] In one embodiment of the present invention, the second anchor holes 2312 are staggered along the length direction of the column; preferably, the second anchor holes 2312 are appropriately densely arranged in the vicinity of the beam-column node; In one embodiment of the present invention, the pre-buried slurry discharge pipe 233 is "L" shaped.

[0064] In one embodiment of the present invention, the second grouting material 237 is a high-strength non-shrinkage grouting material.

[0065] In one embodiment of the present invention, the column grouting connection node includes a web connection plate 24 and a flange connection plate 25; the flange connection plate 25 includes an inner flange connection plate 251 and an outer flange connection plate 252; the inner flange connection plate 251 is provided with a fourth mounting hole 2511; the outer flange connection plate 252 is provided with a fifth mounting hole 2521; In one of the embodiments of the present invention, when it is necessary to connect adjacent prefabricated internal grouting U-shaped steel columns in the height direction, the web connecting plate 24 is fitted and connected to the inner side of the web at the lower end of the upper prefabricated internal grouting U-shaped steel column 23 and the inner side of the web at the upper end of the lower prefabricated internal grouting U-shaped steel column 23 and welded and fixed, and the web connecting plate 24 is aligned with the central axis of the web of the prefabricated internal grouting U-shaped steel column 23, and the cross-sectional dimensions of the upper prefabricated internal grouting U-shaped steel column 23 and the central axes are aligned; screws pass through the fourth mounting hole 2511, the third mounting hole 2311 and the fifth mounting hole 2521 to connect and fix the flange inner connecting plate 251, the U-shaped steel 231 and the flange outer connecting plate 252.

[0066] in, Figure 2 As shown, one prefabricated internally grouted U-shaped steel column is arranged in the height direction. If multiple prefabricated internally grouted U-shaped steel columns are arranged, the upper and lower adjacent prefabricated internally grouted U-shaped steel columns are connected by a column grouting connection node.

[0067] In one embodiment of the present invention, after the prefabricated internal grouting U-shaped steel column 23 located at the upper part is connected and fixed with the prefabricated internal grouting U-shaped steel column 23 located at the lower part, a closing plate 5 is used to close the open surface of the column grouting connection node, and a grouting hole 51 is provided on the closing plate 5 near the lower end. In one embodiment of the present invention, an upward grouting method is adopted to grout from the grouting hole 51 on the closed plate 5, and the third grouting material adopts high-strength non-shrinkage grouting material. When the third grouting material is discharged from the embedded grouting pipe 233 on the prefabricated internal grouting U-shaped steel column 23 located at the upper part, it means that the column grouting connection node is completely filled. After the third grouting material is filled, the grouting hole 51 and the embedded grouting pipe 233 are closed; after the third grouting material is poured, effective maintenance measures are taken in time according to the construction technical plan, and the construction of the column grouting connection node is completed after maintenance.

[0068] In one of the embodiments of the present invention, after completing the construction of the column grouting connection node, the anchor bolt 3 is tightened again so that the original frame 1 to be reinforced and the external frame 2 and the first grouting material 4 therebetween fit tightly to increase the friction between their interfaces to transfer the shear force between the original frame 1 to be reinforced and the external frame 2.

[0069] In one embodiment of the present invention, the cantilever section I-shaped steel beam 21 is located between the prefabricated internal grouting U-shaped steel column 23 and the middle section I-shaped steel beam 22, and the central axes of the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22 are aligned, and the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22 have the same cross-sectional dimensions.

[0070] In one of the embodiments of the present invention, the beam suspension connection node includes an inverted suspension connection member 26 and a damping energy dissipation member; the damping energy dissipation member can adopt various energy dissipation forms such as friction energy dissipation, soft steel energy dissipation, and viscous damping energy dissipation. The present invention adopts friction energy dissipation as one of the embodiments to facilitate the introduction of subsequent content.

[0071] In one embodiment of the present invention, the upper flanges of the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22 are connected by an inverted suspension connector 26, and the damping energy absorbing component includes a connecting plate 27, a friction plate 28 and a spring locking mechanism 29; the lower flanges of the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22 are bolted by the connecting plate 27, and the beam suspension connection node utilizes the steel beam based on the rotation deformation mechanism of the inverted suspension connector 26 near the upper part of the fracture to drive the damping energy absorbing component located at the lower part to achieve energy dissipation.

[0072] The connecting plate includes an inner connecting plate 271 and an outer connecting plate 272, which are respectively located on both sides of the lower flanges of the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22; the inner connecting plate 271 is provided with a seventh mounting hole 2711, the outer connecting plate 272 is provided with a sixth mounting hole 2721 and a second positioning hole 2722, and there is a set distance between the first positioning hole 212 and the second positioning hole 2722; the friction plate 28 includes a first friction plate 281, a second friction plate 282, a third friction plate 283 and a fourth friction plate 284; the spring positioning mechanism 29 is aligned and welded A second locking hole 2722 is fixedly arranged on the outer connecting plate 272; the spring locking mechanism 29 includes a locking piece 291, a spring 292 and a welding fixing piece 293, the welding fixing piece 293 is welded and fixed to the second locking hole 2722 on the outer connecting plate 272, the locking piece 291 is movably arranged in the welding fixing piece 293, the spring 292 is located in the welding fixing piece 293 and the two ends are respectively against the inner wall of the welding fixing piece 293 and the end of the welding fixing piece 293, the locking piece 291 can be retracted into the welding fixing piece 293 or popped out of the welding fixing piece 293 under the action of the spring 292.

[0073] In one embodiment of the present invention, the retaining member 291 is a screw.

[0074] In one embodiment of the present invention, the inverted suspension connector 26 is disposed on the inner side of the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22; the inverted suspension connector 26 is symmetrically disposed along the center plane of the web of the I-shaped steel. The inner connection plate 271 is symmetrically disposed along the center plane of the web of the I-shaped steel.

[0075] In one embodiment of the present invention, the first mounting hole 211 and the second mounting hole 221 are bar holes, the seventh mounting hole 2711 and the sixth mounting hole 2721 are circular holes, or the seventh mounting hole 2711 and the sixth mounting hole 2721 are bar holes, the first mounting hole 211 and the second mounting hole 221 are circular holes; the length direction of the bar hole is parallel to the length direction of the energy consumption section.

[0076] The screws pass through the seventh mounting hole 2711, the sixth mounting hole 2721 and the first mounting hole 211, so as to connect and fix the inner connecting plate 271 and the outer connecting plate 272 to the cantilever section I-shaped steel beam 21; the screws pass through the seventh mounting hole 2711, the sixth mounting hole 2721 and the second mounting hole 221, so as to connect and fix the inner connecting plate 271 and the outer connecting plate 272 to the middle section I-shaped steel beam 22; the strip hole is aligned with the center of the circular hole; In one embodiment of the present invention, the first friction plate 281 is fitted between the inner connecting plate 271 and the cantilever section I-shaped steel beam 21, the second friction plate 282 is fitted between the outer connecting plate 272 and the cantilever section I-shaped steel beam 21, the third friction plate 283 is fitted between the inner connecting plate 271 and the middle section I-shaped steel beam 22, and the fourth friction plate 284 is fitted between the outer connecting plate 272 and the middle section I-shaped steel beam 22.

[0077] In one embodiment of the present invention, the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22 can provide different friction forces by changing the material of the friction plate to change the friction coefficient between the friction plate and the inner / outer connecting plate and the energy consuming section in the first-order energy consuming section and the second-order energy consuming section, without adjusting the structural dimensions, thereby reducing the amount of specimen processing work. The cantilever section I-shaped steel beam 21 is a first-order energy consuming section, and the middle section I-shaped steel beam 22 is a second-order energy consuming section. The minimum friction force required for the sliding energy consumption of the first-order energy consuming section is less than that of the second-order energy consuming section; therefore, a device with a double-order sliding friction force can be formed in the above manner.

[0078] In one embodiment of the present invention, when the outer connecting plate 272 slides a set distance relative to the first-order energy absorbing section along the length direction of the energy absorbing section, the locking member 291 is locked into the first locking hole 212 on the first-order energy absorbing section under the action of the spring 292.

[0079] When the outer connecting plate 272 slides a set distance relative to the first-order energy absorbing section along the length direction of the energy absorbing section, the first-order energy absorbing section is clamped by the spring locking mechanism 29 (the outer connecting plate does not slide relative to the first-order energy absorbing section, and the outer connecting plate begins to slide relative to the second-order energy absorbing section along the length direction of the energy absorbing support body), the two energy absorbing sections are isolated and set into two parts, thereby realizing the function of double-order friction energy absorption.

[0080] Under normal use load or large use load, the external frame 2 provides additional stiffness for the structure by the damping energy-absorbing part; under small earthquake, the first-order energy-absorbing section slides and consumes energy; under medium and large earthquake, the first-order energy-absorbing section slides and consumes energy when the interlayer displacement is small, and when the interlayer displacement is large, after the first-order energy-absorbing section slides to the maximum set distance and is stuck by the spring locking mechanism, the second-order energy-absorbing section generates sliding work to consume the energy input by the earthquake, providing greater additional damping for the structure and reducing the structural response. The two energy-absorbing sections are provided with different friction forces and locking devices (when the external connection plate 272 slides a set distance relative to the first-order energy-absorbing section along the length direction of the energy-absorbing section, the locking member 291 is locked into the first locking hole 212 on the first-order energy-absorbing section under the action of the spring), so as to realize the function of providing additional stiffness for the structure without sliding under normal use, first-order energy consumption under small earthquake, and second-order energy consumption under medium and large earthquake.

[0081] The design and construction method of the externally attached assembled energy dissipation and shock absorption frame structure reinforcement building of the present invention comprises the following specific steps: 1. Testing and identification: Carry out detailed inspection and appraisal of buildings that need to be reinforced and renovated to obtain on-site situation data. This includes determining the degree of damage to components or houses, evaluating their structural safety and seismic performance, and the distribution of steel bars in the original structural columns. Inspection and appraisal are carried out in accordance with the relevant national standards and specifications to ensure the accuracy and reliability of the data; according to the inspection and appraisal report, combined with on-site surveys and original data analysis, determine a reinforcement and renovation plan that is safe, meets the use specifications, is simple to construct, economical and reasonable, and has little impact on the appearance. Comprehensively evaluate whether the structure and design and construction method of the external assembled energy dissipation and shock absorption frame reinforced building provided by the present invention are suitable for the reinforcement of the building.

[0082] 2. Reinforcement and Reconstruction Design: Carry out detailed reinforcement and reconstruction design. The external frame can be considered to participate in the force according to the principle of stiffness distribution, and the stiffness of the external frame can be determined according to the principle of equal stiffness design. The additional frame is designed and verified by the force distributed to the additional frame, and the design and verification of the anchor bolts are completed, the structure to be reinforced is verified, and then the construction drawing design is completed; the design should ensure that the reinforced structure can meet the expected bearing capacity and seismic performance requirements; after the construction drawing design is completed, it is necessary to review the drawings to ensure that the design complies with relevant specifications and standards; 3. Prefabricated components production: According to the design and construction requirements, the cantilever section I-shaped steel beam 21, the middle section I-shaped steel beam 22, the prefabricated internal grouting U-shaped steel column 23, and the welded connection between the prefabricated internal grouting U-shaped steel column 23 and the cantilever section I-shaped steel beam 21, the inverted suspension connector 26, the connecting plate 27, the friction plate 28 and the spring positioning mechanism 29 in the beam suspension connection node are processed and manufactured in the factory according to the construction drawings; the web connecting plate 24 and the flange connecting plate 25 required for the column grouting connection node. In order to facilitate manufacturing and installation and reduce the number of splicing connection nodes of the column, in general, the installation unit of the column is three layers per one; the quality is strictly controlled during the manufacturing process to ensure that the size, shape and strength of the components meet the design requirements; 4. On-site construction: 1. Construction preparation: prepare the necessary materials, equipment and personnel according to the construction drawings and construction plan; clean and organize the construction site to ensure the safety and cleanliness of the construction environment; 2. Anchor bolt implantation: according to the construction drawings, complete the anchor bolt drilling on the frame column of the original frame 1 to be reinforced, remove the floating dust and debris in the first anchor hole 11, inject glue evenly and slowly from the bottom of the hole to the outside, and pay attention to remove the air in the hole; when installing the anchor bolt 3, strictly control the installation depth of the anchor bolt according to the product requirements, and stop immediately after the screwing reaches the specified depth; after the installation of the anchor bolt 3 is completed, the next construction process can be carried out after the curing temperature and corresponding static curing time specified by the product are met.

[0083] 3. Transport and assembly of test pieces: transport the prefabricated components to the construction site, locate and install the beam suspension connection node between the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22 in the cantilever section of the beam-column according to the construction drawings, and ensure that the components are accurately positioned and firmly connected during the installation process, and comply with relevant specifications and standards; align the central axis of the cantilever section I-shaped steel beam 21 and the middle section I-shaped steel beam 22, weld the upper flanges of the two sections of I-shaped steel beams with the inverted suspension connector 26, and bolt the lower flanges of the two sections of I-shaped steel beams with the connecting plate 27. The bolting interface is provided with a friction plate 28. After the bolting is completed, the spring locking mechanism 29 is welded to the corresponding locking hole.

[0084] 4. Hoisting and fixing of the first external frame: Cast the foundation on the structure site, hoist the external frame 2, install and position it so that the anchor holes on the prefabricated internal grouting U-shaped steel column 23 are aligned with the anchor bolts 3 on the frame column of the original frame 1 to be reinforced, adjust its position so that it can be close to the cantilever beam of the reinforced structure, and install a temporary bracket between the reinforced structure and the external frame 2; adjust the external frame 2 to leave a grouting gap of 10mm~20mm between the column contact surfaces, and cast the lower column foot of the external frame 2 in the cast-in-place foundation; after the anchor bolts 3 are connected, use cement mortar to seal the seams and pour the mixed first grouting material 4 into the grouting seams. The first grouting material 4 uses high-strength non-shrinkage grouting material. Since the first grouting material 4 has strong fluidity and excellent self-compacting properties, it does not need to be stirred after the first grouting material 4 is poured to fill all the gaps. Effective maintenance measures should be taken in time according to the construction technical plan.

[0085] 5. Hoisting and fixing of other external frames: Splice and hoist the second external frame, the second external frame is located above the first external frame, and the columns of the two external frames 2 are aligned; the construction process of the external frame 2 is the same as the above steps; after the installation and fixation of the second external frame is completed, the splicing connection of the columns is connected by the column grouting connection node; the cross-sectional dimensions of the upper and lower columns are the same and the central axes are aligned; the web connecting plate 24 is fitted and connected to the inner side of the web of the upper and lower columns and welded and fixed; the web connecting plate 24 is aligned with the central axes of the web of the upper and lower columns; then the flanges of the upper and lower columns are bolted and fixed by the flange inner connecting plate 251 and the flange outer connecting plate 252; the construction process of other external frames is the same as the above steps; 6. Construction of column grouting connection node: After the connection is fixed, the opening surface of the column grouting connection node is closed with a closing plate 5, and grouting is performed from the grouting hole 51 set at the lower end of the closing plate 5 by the upward grouting method. The third grouting material uses high-strength non-shrinkage grouting material. When the third grouting material is discharged from the pre-buried grouting pipe 233 at the lower part of the upper column, it means that the column grouting connection node is completely filled. Then the grouting hole 51 and the pre-buried grouting pipe 233 are closed, and effective maintenance measures are taken in time according to the construction technical plan. After maintenance, the construction of the column grouting connection node is completed; 7. Tighten anchor bolts for the second time: After completing the construction of the column grouting connection node, tighten the anchor bolts 3 again to enhance the anchoring force, so that the first grouting material 4 between the original frame 1 to be reinforced and the external frame 2 fits tightly, increasing the friction between their interfaces to transmit the shear force between the original frame 1 to be reinforced and the external frame 2.

[0086] 8. Construction closing: After the structural installation is completed, the facade of the external frame 2 is decorated; after the decoration work is completed, the temporary bracket between the original frame 1 to be reinforced and the external frame 2 is removed, and the construction site is cleaned and organized to restore the safety and cleanliness of the construction environment.

[0087] (V) Quality inspection and acceptance: During and after the construction process, quality inspection and acceptance work shall be carried out; the inspection content shall include the size, shape, strength, connection quality and other aspects of the components; the acceptance work shall be carried out in accordance with relevant specifications and standards to ensure the quality and safety of the reinforcement and renovation project.

[0088] (VI) Subsequent processing: Clean and organize the construction site and restore the construction environment; monitor and maintain the reinforced and renovated structure to ensure its long-term stability and safety.

[0089] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The structure of the building is reinforced with an external assembled energy dissipation and shock absorption frame, characterized in that: Including the original frame to be reinforced and the external frame; The external frame includes a prefabricated internal grouting U-shaped steel column, a cantilever section I-shaped steel beam, an intermediate section I-shaped steel beam and a beam suspension connection node. The prefabricated internal grouting U-shaped steel column is used to connect with the frame column of the original frame; one end of the cantilever section I-shaped steel beam is connected to the prefabricated internal grouting U-shaped steel column, and the other end is connected to the intermediate section I-shaped steel beam through a beam suspension connection node; The beam suspension connection node includes an inverted suspension connection piece and a damping energy-absorbing piece. The inverted suspension connection piece connects the upper flanges of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam. The damping energy-absorbing piece includes a connecting plate, a friction plate and a spring clamping mechanism. The connecting plate includes an inner connecting plate and an outer connecting plate. The inner connecting plate and the outer connecting plate are located on both sides of the lower flanges of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam. The friction plates are arranged between the cantilever section I-shaped steel beam and the inner connecting plate, between the cantilever section I-shaped steel beam and the outer connecting plate, between the middle section I-shaped steel beam and the inner connecting plate, and between the middle section I-shaped steel beam and the outer connecting plate. The spring clamping mechanism is arranged on the outer connecting plate, and is used to clamp the cantilever section I-shaped steel beam after the outer connecting plate slides a set distance relative to the cantilever section I-shaped steel beam along the length direction of the cantilever section I-shaped steel beam.

2. The structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building according to claim 1 is characterized in that: A grouting joint is left between the external frame and the original frame to be reinforced, the prefabricated inner grouting U-shaped steel column of the external frame is connected to the frame column of the original frame through anchor bolts and grouting material is poured into the grouting joint.

3. The structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building according to claim 1 is characterized in that: A first anchor hole is provided on the frame column of the original frame; The prefabricated internal grouting U-shaped steel column includes a U-shaped steel and an embedded sleeve, a second anchor hole is arranged on the web of the U-shaped steel, and the second anchor hole can be aligned with the first anchor hole; the embedded sleeve is aligned with the first anchor hole and fixedly arranged, and both sides of the embedded sleeve are connected to the U-shaped steel through stiffening ribs, and pouring holes are arranged on the stiffening ribs; bolts are arranged on the flange of the U-shaped steel; and an embedded grouting pipe is embedded on the prefabricated internal grouting U-shaped steel column.

4. The structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building according to claim 3 is characterized in that: The first anchor holes and the second anchor holes are arranged alternately along the height direction of the column.

5. The structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building according to claim 1 is characterized in that: When at least two prefabricated internally grouted U-shaped steel columns are provided, two adjacent prefabricated internally grouted U-shaped steel columns in the height direction are connected via a column grouting connection node.

6. The structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building according to claim 5 is characterized in that: The prefabricated internal grouting U-shaped steel column includes a U-shaped steel, the U-shaped steel includes a web and a flange, the column grouting connection node includes a web connecting plate and a flange connecting plate, the webs of two prefabricated internal grouting U-shaped steel columns are connected by a web connecting plate, and the flanges are connected by a flange connecting plate.

7. The structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building according to claim 1 is characterized in that: A first locking hole is provided on the lower flange of the cantilever section I-shaped steel beam, and a second locking hole is provided on the outer connecting plate, and a set distance is provided between the first locking hole and the second locking hole; The spring locking mechanism is located on the second locking hole, and includes a locking piece and a spring. When the outer connecting plate does not slide relative to the I-shaped steel beam of the cantilever section, the locking piece in the spring locking mechanism is pressed on the I-shaped steel beam of the cantilever section under the action of the spring. When the outer connecting plate slides a set distance relative to the I-shaped steel beam of the cantilever section along the length direction, the locking piece is locked into the first locking hole on the I-shaped steel beam of the cantilever section under the action of the spring.

8. The structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building according to claim 1 is characterized in that: When the outer connecting plate slides a set distance relative to the cantilever section I-shaped steel beam and then clamps the cantilever section I-shaped steel beam through the spring clamping mechanism, the function of double-stage friction energy dissipation is realized.

9. The structure of the building reinforced with an externally attached assembled energy dissipation and shock absorption frame according to any one of claims 1 to 8, characterized in that: The friction coefficient is changed by changing the material of the friction plate between the cantilever section I-shaped steel beam and the inner connecting plate and the outer connecting plate, and the material of the friction plate between the middle section I-shaped steel beam and the inner connecting plate and the outer connecting plate to provide different friction forces.

10. The design and construction method of the structure of the externally attached assembled energy dissipation and shock absorption frame reinforced building according to claims 1-9, characterized in that: The following steps are involved: Prefabricated components are processed and manufactured in the factory, including: cantilever I-shaped steel beams, middle I-shaped steel beams, prefabricated internal grouting U-shaped steel columns and beam suspension connection nodes; Complete the anchor bolt drilling on the original frame; Transporting prefabricated components to the construction site; Positioning and installing a span external frame at the beam suspension connection node between the cantilever section I-shaped steel beam and the middle section I-shaped steel beam, aligning the central axis of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam, fixing the upper flange of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam with an inverted suspension connector, connecting the lower flange of the cantilever section I-shaped steel beam and the middle section I-shaped steel beam through an inner connecting plate and an outer connecting plate, and setting a friction plate; Cast the foundation on site, hoist the external frame, install and position it so that the anchor holes on the prefabricated internal grouting U-shaped steel columns are aligned with the anchor bolts on the frame columns of the original frame to be reinforced, adjust its position so that it can fit closely against the cantilever beam of the reinforced structure, and install a temporary bracket between the reinforced structure and the external frame; adjust the external frame so that grouting joints are left between the contact surfaces of the columns, and cast the lower column feet of the external frame in the cast-in-place foundation; after the anchor bolts are connected, seal the joints with cement mortar and pour the mixed grouting material into the grouting joints.

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