Structure and method for converting a built frame-bent story to a steel frame

Abstract

The application relates to a structure of built frame-bent and heightened conversion into a steel frame, which comprises original concrete columns, original concrete beams, steel beams, column foot supports, column side reinforcing steel plates, beam side reinforcing steel plates, heightened concrete columns and heightened concrete beams; the column foot supports are fixed on the ground and sleeved on the original concrete columns; the bottoms of the column side reinforcing steel plates are fixed on the column foot supports, the column side reinforcing steel plates are distributed around the original concrete columns, a pouring cavity is formed between the column side reinforcing sleeve and the original concrete column, and a reinforced concrete layer is poured; the column side reinforcing steel plates extend upwards out of the original concrete columns, the top of the original concrete column is poured to obtain the heightened concrete column, and the end of the steel beam is embedded and fixed in the heightened concrete column; the beam side reinforcing steel plates are fixed around the side walls of the original concrete beams, and the beam side reinforcing steel plates are fixedly connected with the column side reinforcing steel plates. The original steel beams are not disassembled, the installation nodes of the original steel beams and the column top end bearing force system are maintained, and the nodes are comprehensively reinforced.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a structure and method for converting an existing frame structure into a steel frame by raising it. Background Technology

[0002] In existing light steel frame structures, the original concrete beams and columns are arranged in a T-shape, and steel beams are erected between the tops of two adjacent original concrete columns along a direction perpendicular to the original concrete beams, forming a frame structure, which is often used for structures such as roofs.

[0003] In the continuation or renovation of existing buildings with existing frame structures, it is often necessary to raise and reinforce the original concrete beams and columns due to changes in building function, adjustments to floor height, or requirements to increase load-bearing capacity.

[0004] In existing technologies, since steel beams are directly erected and anchored to the top of the original concrete columns, their position obstructs the space for the concrete columns to be heightened. Therefore, it is usually necessary to remove the steel beams first to make room for the subsequent installation of rebar, binding of steel bars, and pouring of new concrete.

[0005] This conventional approach is not only cumbersome, but also prone to disturbing and damaging the core area of ​​the original node during the steel beam removal process, posing a potential threat to the overall stability of the existing structure.

[0006] Furthermore, this approach often requires the reconstruction of steel beams after the height increase. However, in actual reconstruction or renovation projects, the elevation of the existing roof, enclosure system, or related existing equipment is often strictly limited, requiring the steel beam elevation to remain fixed. Therefore, it is impossible to directly erect the steel beam on top of the heightened concrete column. Instead, the steel beam must be anchored to the side of the heightened concrete column, which directly changes the original load-bearing system of the steel beam node column top. This not only weakens the load-bearing capacity of the node but also poses a potential threat to the overall safety of the structure after the reconstruction.

[0007] Therefore, it is necessary to study a structure and method for converting an existing frame structure into a steel frame by raising it. Summary of the Invention

[0008] Therefore, the purpose of this invention is to provide a structure and method for converting an existing frame structure into a steel frame by raising it, which can effectively solve the problems of cumbersome steps and reduced stress capacity of nodes caused by the need to disassemble and assemble steel beams in the existing raising process.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A structure for converting an existing frame structure into a steel frame structure includes original concrete columns, original concrete beams, steel beams, column base supports, column side reinforcement steel plates, beam side reinforcement steel plates, heightened concrete columns, and heightened concrete beams. The original concrete column is fixed to the ground; the original concrete beam is fixed vertically to the upper part of the original concrete column from left to right; and the steel beam is erected vertically to the top of the original concrete column from front to back. The column base support is fixed to the ground and fitted onto the original concrete column; The bottom of the column side reinforcement steel plate is fixed on the column base support. The column side reinforcement steel plates are distributed around the original concrete column. Adjacent column side reinforcement steel plates are sealed and fixed to form a column side reinforcement sleeve. The column-side reinforcing steel plate maintains a gap with the original concrete column, so that a casting cavity is formed between the column-side reinforcing sleeve and the original concrete column to cast the reinforced concrete layer. The steel plate on the side of the column extends upward from the original concrete column, so as to cast a heightened concrete column integrated with the reinforced concrete layer on the top of the original concrete column. The heightened concrete column embeds and fixes the end of the steel beam. The beam-side reinforcing steel plate is fixed around the side wall of the original concrete beam, and the beam-side reinforcing steel plate is fixedly connected to the column-side reinforcing steel plate. The heightened concrete beam is positioned above the original concrete beam and between the column-side reinforcing steel plates on two adjacent sets of heightened concrete columns.

[0010] Furthermore, the column base support includes an upper column base plate, a lower column base plate, and a column base shoe plate; Both the upper column base plate and the lower column base plate are two halves of a spliced ​​structure that surrounds the original concrete column. The lower column base plate is anchored to the ground. The column base plate is vertically fixed to the lower column base plate. The column base plates are distributed around the original concrete column at intervals. The column side reinforcement steel plate is fixedly connected to the column base plate on the side facing the original concrete column. The upper column base plate is fixed to the top of the column base boot plate.

[0011] Furthermore, both the upper and lower column base plates have multiple positioning slots that correspond to the column base shoe plates for insertion, and the column base shoe plates are inserted and fixed in the positioning slots.

[0012] Furthermore, the column-side reinforcing steel plate includes a front reinforcing steel plate, a rear reinforcing steel plate, and left and right reinforcing steel plates that enclose the column-side reinforcing sleeve; The bottom of the front and rear reinforcing steel plates are provided with grouting holes, and the front reinforcing steel plate is pre-set with a steel beam through hole to avoid the steel beam. The left and right reinforcing steel plates are pre-drilled with beam through holes to avoid the original cast beam, and the beam side reinforcing steel plates are fixedly connected to the left and right reinforcing steel plates.

[0013] Furthermore, the heightened concrete beam is pre-embedded with heightening stirrups and ties for fixing. The top of the original concrete beam has a chisel opening to expose the original beam stirrups, and the heightened stirrups are fixedly connected to the original beam stirrups.

[0014] Furthermore, a waist reinforcement sleeve corresponding to the raised waist reinforcement is fixed on one side of the left and right reinforcing steel plates near the beam side, and the end of the raised waist reinforcement is fixed in the waist reinforcement sleeve.

[0015] Furthermore, a cap plate is fixed to the top of the column-side reinforcing sleeve, and a pouring port is provided on the cap plate.

[0016] Furthermore, stiffening plates are fixedly connected between the column-side reinforcing steel plates and the beam-side reinforcing steel plates.

[0017] A method for converting an existing frame structure into a steel frame by increasing its height, applicable to the aforementioned structure of converting an existing frame structure into a steel frame, includes the following steps: S100: Install column base support; First, the lower column base plate is spliced ​​together and fitted onto the original concrete column, and then anchored to the ground. Next, insert and fix each column foot shoe plate into the positioning slot on the lower column foot base plate to ensure that the top surface of each column foot shoe plate is at the same height and maintains the same distance from the original concrete column. Finally, the upper column base plate is fixed to the column base boot plate; S200: Install steel plates to reinforce the sides of the columns; Column side reinforcement steel plates are installed around the original concrete column. The bottom of the column side reinforcement steel plates is fixed to the side of the column foot plate facing the original concrete column. Adjacent column side reinforcement steel plates are sealed and fixed to form a column side reinforcement sleeve. A casting cavity is formed between the column side reinforcement sleeve and the original concrete column. The steel plate reinforcing the column side extends upward from the original concrete column, so that the pouring cavity includes the predetermined position of the heightened concrete column. S300: Pouring a reinforced concrete layer; Pressure grouting is used to inject self-compacting concrete into the casting cavity through the grouting port at the bottom of the steel plate on the side of the column. The process is stopped when the slurry rises to the bottom of the steel beam, thus obtaining the reinforced concrete layer. S400: Cast-in-place heightened concrete column; Self-compacting concrete is poured into the top of the casting cavity, the end of the steel beam is embedded and poured upward to the specified height to obtain a heightened concrete column that is integrated with the reinforced concrete layer. S500: Binding and heightening beam reinforcement; A web reinforcement sleeve is fixed on one side of the reinforcing steel plate near the beam. Multiple sets of heightened web reinforcements are installed above the original concrete beam, with the ends of the heightened web reinforcements fixed in the web reinforcement sleeve. The original beam stirrups are chiseled out at the top of the original concrete beam, and the heightened stirrups are fixedly connected to the original beam stirrups. The heightened stirrups are then tied around the heightened web reinforcement. S600: Cast-in-place heightened concrete beam; A formwork was erected on top of the original concrete beam, and concrete was poured to obtain a heightened concrete beam.

[0018] Furthermore, a lower concrete column is provided below the ground, and the lower concrete column is located below the original concrete column; The lower surface of the ground and the side walls of the lower concrete columns are both anchored with embedded plates, and reinforcing diagonal braces are fixed between the embedded plates; the embedded plates and reinforcing diagonal braces are set before step S100.

[0019] The beneficial effects of the above technical solution are: (1) The present invention directly uses the column side reinforcement steel plate as the outer formwork to pour the heightened concrete column on the top of the original concrete column. The end of the original steel beam is directly embedded and fixed inside the heightened concrete column. There is no need to remove, move or reinstall the original steel beam. The installation node of the original steel beam and the bearing system of the column top are maintained. The cumbersome process caused by disassembly and reassembly in the traditional process is completely avoided. The construction cycle is shortened and the construction cost is greatly reduced. At the same time, the disassembly avoids the disturbance and damage to the original steel beam node and the surrounding core area, and prevents potential hidden dangers to the overall stability of the existing structure.

[0020] (2) In this invention, the ends of the steel beams are directly embedded in the heightened concrete columns. Through the encapsulation and embedding effect of the concrete, the rotational constraint and pull-out resistance of the ends of the steel beams are enhanced. This not only does not affect the steel beam joints, but also strengthens the steel beam joints. Furthermore, the heightened concrete columns can improve their own strength by using the steel beams as a skeleton, thereby increasing the structural strength of the steel beam joints and the heightened column joints.

[0021] (3) The present invention surrounds the original concrete column with sealed and fixed column side reinforcement steel plates, and fills the pouring cavity between the steel plates and the original column with a reinforcement concrete layer. The column side reinforcement steel plates can not only serve as permanent steel external formwork for the new concrete, realizing formwork-free construction, but also form a reinforcement layer structure combining concrete and steel plates on the outside of the original concrete column together with the reinforcement concrete layer, thus providing a dual-coordinated overall reinforcement effect for the original concrete column; and the reinforcement layer structure is integrated with the height of the increased concrete column, thus reinforcing the connection node between the original concrete column and the increased concrete column.

[0022] Based on this, the reinforcement layer structure is combined with the side reinforcement steel plates surrounding the original beam sidewalls to reinforce the joint between the original concrete column and the original concrete beam. The heightened concrete beam uses the side reinforcement steel plates as the side formwork and the fixed foundation for the heightened web reinforcement. In effect, a multi-dimensional collaborative reinforcement system is formed that acts on the original concrete column, the heightened concrete column, the steel beam, the original concrete beam, and the heightened concrete beam, which plays a comprehensive role in strengthening the overall structural strength. Attached Figure Description

[0023] Figure 1 This is a front cross-sectional view of the present invention; Figure 2 for Figure 1 Cross-sectional view along the AA direction (casting not shown); Figure 3 for Figure 1 Cross-sectional view along the BB direction; Figure 4 for Figure 1 Cross-sectional view in the CC direction (casting not shown); Figure 5 for Figure 1 A cross-sectional view along the DD direction; Figure 6 for Figure 1 A cross-sectional view along the EE direction; Figure 7 for Figure 1 A cross-sectional view along the FF direction; Figure 8 for Figure 1 A magnified view of point G in the image; Figure 9 Drawings of the steel plates used for reinforcing the sides of the column; Figure 10 This is a part drawing of the upper column base plate; Figure 11 This is a part drawing of the cover plate.

[0024] Attached reference numerals: 1. Original concrete column; 2. Original concrete beam; 3. Steel beam; 4. Column base support; 5. Column side reinforcement steel plate; 6. Beam side reinforcement steel plate; 7. Heightened concrete column; 8. Heightened concrete beam; 9. Ground surface; 10. Reinforced concrete layer; 11. Cap plate; 12. Stiffening plate; 13. Lower concrete column; 14. Embedded plate; 15. Reinforced diagonal brace; 201. Chisel notch; 401 1. Upper column base plate; 402. Lower column base plate; 403. Column base shoe plate; 404. Positioning slot; 501. Front reinforcing steel plate; 502. Rear reinforcing steel plate; 503. Left and right reinforcing steel plates; 504. Waist reinforcement sleeve; 5011. Steel beam through hole; 5021. Grouting hole; 5031. Crossbeam through hole; 801. Increased waist reinforcement; 802. Increased stirrups; 1101. Pouring port. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: This embodiment aims to provide a structure and method for converting an existing frame structure into a steel frame by raising it. It is mainly used for the construction of raising and reconstructing an existing frame structure, and addresses the problem that the existing raising process requires disassembling and assembling steel beams, which leads to cumbersome steps and reduced stress capacity of the joints.

[0026] A structure that converts an existing frame structure into a steel frame structure, such as... Figure 1 It includes the original concrete column 1, the original concrete beam 2, the steel beam 3, the column base support 4, the column side reinforcement steel plate 5, the beam side reinforcement steel plate 6, the heightened concrete column 7, and the heightened concrete beam 8.

[0027] The original concrete column 1 is fixed on the ground 9. The original concrete beam 2 is cast vertically and fixed on the upper part of the original concrete column 1. The steel beam 3 is erected vertically on the top of the original concrete column 1. The above parts are all original structures. This application requires reconstruction on this basis, raising the original concrete column 1 and the original concrete beam 2, while maintaining the elevation of the steel beam 3, without removing the steel beam 3, and at the same time, comprehensively reinforcing the joints.

[0028] The column base support 4 is fixed to the ground 9 and fitted onto the original concrete column 1, serving as the fixing foundation and alignment reference for the column side reinforcement steel plate 5. Specifically, as follows... Figure 1 , 2 8. The column base support 4 includes an upper column base plate 401, a lower column base plate 402, and a column base shoe plate 403. Both the upper column base plate 401 and the lower column base plate 402 are two-part splicing structures surrounding the original concrete column 1. That is, both are square ring plates, divided in the middle, and spliced ​​at the bottom of the original concrete column 1 and welded together by bevel welding to fit onto the original concrete column 1.

[0029] The lower column base plate 402 is anchored to the ground 9 using chemical anchors. Rebar can be installed first, and the lower column base plate 402 can be fixed after the anchoring adhesive has solidified.

[0030] The column base plate 403 is vertically fixed to the lower column base plate 402. The column base plates 403 are spaced around the original concrete column 1, such as... Figure 10 Multiple positioning slots 404 are provided on both the upper column base plate 401 and the lower column base plate 402, which are corresponding to the column base shoe plates 403. The column base shoe plates 403 are first inserted and welded to the positioning slots 404 of the lower column base plate 402, so as to quickly determine the vertical and horizontal positions of each column base shoe plate 403.

[0031] The upper column base plate 401 is welded and fixed to the top of the column base shoe plate 403. During installation, the upper column base plate 401 is quickly aligned with the main unit's ...

[0032] The bottom of the column-side reinforcing steel plate 5 is welded and fixed to the column base support 4, specifically to the side of the column base shoe plate 403 facing the original concrete column 1. The column-side reinforcing steel plates 5 are distributed around the original concrete column 1, and adjacent column-side reinforcing steel plates 5 are sealed and fixed to form a column-side reinforcing sleeve.

[0033] like Figure 3 and Figure 4 The column-side reinforcing steel plate 5 maintains a gap with the original concrete column 1, forming a pouring cavity between the column-side reinforcing sleeve and the original concrete column 1 to pour the reinforced concrete layer 10. The column-side reinforcing steel plate 5 not only serves as a permanent steel formwork for the newly added concrete, achieving formwork-free construction, but also, together with the reinforced concrete layer 10, forms a reinforced layer structure combining concrete and steel plate on the outside of the original concrete column 1, providing a dual, synergistic overall reinforcement effect.

[0034] like Figure 1 and 5 The reinforcing steel plate 5 extends upward from the original concrete column 1, forming a raised concrete column 7 integrated with the reinforcing concrete layer 10, which is then poured on top of the original concrete column 1. The raised concrete column 7 embeds and fixes the end of the steel beam 3. The raised concrete column 7 and the reinforcing layer structure are poured based on the same formwork system and chamber, and their structures are highly integrated, which is equivalent to pre-embedding the original concrete column 1 within it, thus reinforcing the connection node between the original concrete column 1 and the raised concrete column 7. The raised concrete column 7 directly embeds the end of the steel beam 3, and through the encapsulation effect of the concrete, it enhances the rotational restraint and pull-out resistance of the end of the steel beam 3. This not only does not affect the joint of the steel beam 3, but also reinforces the joint of the steel beam 3. Furthermore, the raised concrete column 7 can improve its own strength by using the steel beam 3 as a skeleton, increasing the structural strength of the joint of the steel beam 3 and the raised column joint.

[0035] like Figure 9 The column-side reinforcing steel plate 5 includes a front reinforcing steel plate 501, a rear reinforcing steel plate 502, and left and right reinforcing steel plates 503 that enclose the column-side reinforcing sleeve. Grouting holes 5021 are provided at the bottom of the front reinforcing steel plate 501 and the rear reinforcing steel plate 502 for high-pressure grouting. A steel beam through-hole 5011 is pre-set on the front reinforcing steel plate 501 to avoid the steel beam 3. The front reinforcing steel plate 501 is cut vertically into two parts at the steel beam through-hole 5011, and then joined vertically to the steel beam 3 before welding.

[0036] The left and right reinforcing steel plates 503 are pre-set with beam through holes 5031 to avoid the original cast-in-place beam 2. The left and right reinforcing steel plates 503 are divided into two parts at the beam through holes 5031, spliced ​​onto the original concrete beam 2 and then welded.

[0037] like Figure 4 and Figure 6 The beam-side reinforcing steel plate 6 is welded and fixed to the side wall of the original concrete beam 2. The beam-side reinforcing steel plate 6 is fixedly connected to the column-side reinforcing steel plate 5, specifically to the left and right reinforcing steel plates 503. The beam-side reinforcing steel plate 6 is first welded to form a U-shaped base to reinforce the bottom and side wall of the original concrete beam 2, and then the top is closed to form a rectangular sleeve structure. The beam-side reinforcing steel plate 6 is then fixedly connected to the column-side reinforcing steel plate 5, reinforcing the connection between the original concrete beam 2 and the original concrete column 1.

[0038] like Figure 1 and Figure 7 The heightened concrete beam 8 is placed above the original concrete beam 2 and between the column-side reinforcing steel plates 5 on the two adjacent sets of heightened concrete columns 7. The heightened concrete beam 8 uses the beam-side reinforcing steel plates 6 as the bottom formwork and the column-side reinforcing steel plates 5 as the left and right side formwork, requiring additional front and rear formwork.

[0039] like Figure 7 The heightened concrete beam 8 is pre-embedded with heightened waist bars 801 and heightened stirrups 802 for binding and fixing; the top of the original concrete beam 2 has a chisel 201 to expose the original beam stirrups, and the heightened stirrups 802 are welded to the original beam stirrups.

[0040] like Figure 1 The left and right reinforcing steel plates 503 are fixed with a waist reinforcement sleeve 504 corresponding to the heightening waist reinforcement 801 on one side of the reinforcing steel plate 6 near the beam. The end of the heightening waist reinforcement 801 is fixed in the waist reinforcement sleeve 504.

[0041] Furthermore, a cap plate 11 is fixed to the top of the column side reinforcing sleeve, and a pouring port 1101 is provided on the cap plate 11 to facilitate pouring, vibration and curing.

[0042] Furthermore, stiffening plates 12 are welded and fixedly connected between the column-side reinforcing steel plate 5 and the beam-side reinforcing steel plate 6 to enhance the strength of the joint.

[0043] A method for converting an existing frame structure into a steel frame by increasing its height includes the following steps: S100: Install column base support 4; Remove the finishing layer on ground 9, insert chemical anchors at the designated locations, and allow it to stand until the anchoring adhesive hardens. Then, cut the lower column base plate 402 into two pieces, assemble them together, and fit them onto the original concrete column 1. Then, use a bevel welding process to weld the cut lower column base plate 402 together, and finally fix it to the chemical anchors anchored on ground 9.

[0044] Subsequently, each column foot shoe plate 403 is inserted into and welded to the positioning slot 404 on the lower column foot base plate 402 to ensure that the top surface of each column foot shoe plate 403 is at the same height and maintains the same distance from the original concrete column 1.

[0045] Finally, the upper column base plate 401 is welded and fixed to the column base shoe plate 403, completing the installation of the column base support 4.

[0046] S200: Install 5 steel plates for column side reinforcement; A column-side reinforcing steel plate 5 is installed around the original concrete column 1. The bottom of the column-side reinforcing steel plate 5 is fixed to the side of the column foot shoe plate 403 facing the original concrete column 1. Adjacent column-side reinforcing steel plates 5 are sealed and fixed to form a column-side reinforcing sleeve. A pouring cavity is formed between the column-side reinforcing sleeve and the original concrete column 1.

[0047] The column-side reinforcing steel plate 5 extends upward from the original concrete column 1, so that the pouring cavity includes the predetermined position of the heightened concrete column 7.

[0048] S300: Pour 10 layers of reinforced concrete; Pressure grouting is used to inject self-compacting concrete into the casting cavity through the grouting port at the bottom of the steel plate 5 on the column side. The process is stopped after the grout rises to the bottom of the steel beam 3, resulting in a reinforced concrete layer 10.

[0049] S400: Cast 7 heightened concrete columns; Self-compacting concrete is poured into the top of the casting cavity, the end of the steel beam 3 is embedded and poured upward to the specified height to obtain a heightened concrete column 7 integrated with the reinforced concrete layer 10.

[0050] S500: Binding and heightening beam reinforcement; A web reinforcement sleeve 504 is fixed on one side of the reinforcing steel plate 6 near the beam side. Multiple sets of heightening web reinforcements 801 are installed above the original concrete beam 2, and the ends of the heightening web reinforcements 801 are fixed in the web reinforcement sleeve 504. The original beam stirrups are chiseled out at the top of the original concrete beam 2, and the heightened stirrups 802 are fixedly connected to the original beam stirrups. The heightened stirrups 802 are tied around the heightened waist bars 801 for fixation.

[0051] S600: 8 heightened concrete beams were poured; A formwork was erected above the original concrete beam 2 and concrete was poured to obtain a raised concrete beam 8.

[0052] In this embodiment, a lower concrete column 13 is provided below the ground 9. The lower concrete column 13 is located below the original concrete column 1 and is the original structure.

[0053] The lower surface of ground 9 and the side wall of the lower concrete column 13 are both anchored with embedded plates 14, and reinforcing diagonal braces 15 are fixed between the embedded plates 14. The embedded plates 14 and the reinforcing diagonal braces 15 are set before step S100 for pre-reinforcement.

Claims

1. A structure for converting an existing frame structure into a steel frame by increasing its height, characterized in that: Including the original concrete column (1), the original concrete beam (2), the steel beam (3), the column base support (4), the column side reinforcement steel plate (5), the beam side reinforcement steel plate (6), the heightened concrete column (7), and the heightened concrete beam (8); The original concrete column (1) is fixed on the ground (9); the original concrete beam (2) is fixed vertically on the upper part of the original concrete column (1) from left to right; and the steel beam (3) is erected vertically on the top of the original concrete column (1) from front to back. The column base support (4) is fixed on the ground (9) and fitted onto the original concrete column (1). The bottom of the column side reinforcement steel plate (5) is fixed on the column foot support (4). The column side reinforcement steel plate (5) is distributed around the original concrete column (1). Adjacent column side reinforcement steel plates (5) are sealed and fixed to form a column side reinforcement sleeve. The column-side reinforcing steel plate (5) maintains a gap with the original concrete column (1), so that a casting cavity is formed between the column-side reinforcing sleeve and the original concrete column (1) to cast the reinforcing concrete layer (10). The column-side reinforcing steel plate (5) extends upward from the original concrete column (1) to pour a heightened concrete column (7) integrated with the reinforcing concrete layer (10) at the top of the original concrete column (1). The heightened concrete column (7) embeds and fixes the end of the steel beam (3). The beam-side reinforcing steel plate (6) is fixed around the side wall of the original concrete beam (2), and the beam-side reinforcing steel plate (6) is fixedly connected to the column-side reinforcing steel plate (5); The heightened concrete beam (8) is positioned above the original concrete beam (2) and between the column-side reinforcing steel plates (5) on two adjacent sets of heightened concrete columns (7).

2. The structure for converting an existing frame structure into a steel frame by raising it, as described in claim 1, is characterized in that: The column base support (4) includes an upper column base plate (401), a lower column base plate (402), and a column base shoe plate (403). The upper column base plate (401) and the lower column base plate (402) are both two halves of a spliced ​​structure surrounding the original concrete column (1); The lower column base plate (402) is anchored to the ground (9). The column foot boot plate (403) is vertically fixed on the lower column foot base plate (402). The column foot boot plates (403) are distributed around the original concrete column (1) at intervals. The column side reinforcement steel plate (5) is fixedly connected to the column foot boot plate (403) on the side facing the original concrete column (1). The upper column base plate (401) is fixed to the top of the column base boot plate (403).

3. The structure for converting an existing frame structure into a steel frame by raising it, as described in claim 2, is characterized in that: Multiple positioning slots (404) are provided on both the upper column base plate (401) and the lower column base plate (402) to be inserted into the column base shoe plate (403). The column base shoe plate (403) is inserted into and fixed in the positioning slot (404).

4. A structure for converting an existing frame structure into a steel frame by raising it, as described in claim 2 or 3, characterized in that: The column side reinforcement steel plate (5) includes a front reinforcement steel plate (501), a rear reinforcement steel plate (502), and left and right reinforcement steel plates (503) that enclose the column side reinforcement sleeve. The bottom of the front reinforcing steel plate (501) and the rear reinforcing steel plate (502) are provided with grouting holes (5021), and the front reinforcing steel plate (501) is provided with steel beam through holes (5011) to avoid the steel beam (3). The left and right reinforcing steel plates (503) are pre-set with beam through holes (5031) to avoid the original cast beam, and the beam side reinforcing steel plate (6) is fixedly connected to the left and right reinforcing steel plates (503).

5. The structure for converting an existing frame structure into a steel frame by raising it, as described in claim 4, is characterized in that: The heightened concrete beam (8) is pre-embedded with heightened stirrups (801) and heightened hoops (802) that are tied and fixed. The top of the original concrete beam (2) has a chisel (201) to expose the original beam stirrups, and the heightened stirrups (802) are fixedly connected to the original beam stirrups.

6. The structure for converting an existing frame structure into a steel frame by raising it, as described in claim 5, is characterized in that: The left and right reinforcing steel plates (503) are fixed with a waist reinforcement sleeve (504) corresponding to the raised waist reinforcement (801) on the side of the reinforcing steel plate (6) near the beam. The end of the raised waist reinforcement (801) is fixed in the waist reinforcement sleeve (504).

7. A structure for converting an existing frame structure into a steel frame by raising it, as described in claim 2 or 3, characterized in that: The top of the column side reinforcing sleeve is fixed with a cap plate (11), and a pouring port (1101) is opened on the cap plate (11).

8. A structure for converting an existing frame structure into a steel frame by raising it, as described in claim 2 or 3, characterized in that: A stiffening plate (12) is fixedly connected between the column-side reinforcing steel plate (5) and the beam-side reinforcing steel plate (6).

9. A method for converting an existing frame structure into a steel frame by increasing its height, applicable to the structure described in claim 6 for converting an existing frame structure into a steel frame, characterized in that: Includes the following steps: S100: Install column base support (4); First, the lower column base plate (402) is spliced ​​together and fitted onto the original concrete column (1), and then anchored to the ground (9). Then, insert and fix each column foot shoe plate (403) into the positioning slot (404) on the lower column foot base plate (402) to ensure that the top surface of each column foot shoe plate (403) is at the same height and maintains the same distance from the original concrete column (1); Finally, the upper column base plate (401) is fixed to the column base shoe plate (403); S200: Install column side reinforcement steel plates (5); A column-side reinforcing steel plate (5) is installed around the original concrete column (1). The bottom of the column-side reinforcing steel plate (5) and the column foot shoe plate (403) are fixed to the side facing the original concrete column (1). Adjacent column-side reinforcing steel plates (5) are sealed and fixed to form a column-side reinforcing sleeve. A pouring cavity is formed between the column-side reinforcing sleeve and the original concrete column (1). The column side reinforcement steel plate (5) extends upward from the original concrete column (1), so that the pouring cavity includes the predetermined position of the heightened concrete column (7); S300: Pour the reinforced concrete layer (10); Pressure grouting process is used to inject self-compacting concrete into the casting cavity from the grouting port at the bottom of the column side reinforcement steel plate (5). The process is stopped after the slurry emerges from the bottom of the steel beam (3) to obtain the reinforcement concrete layer (10). S400: Pour concrete to increase the height of the column (7); Self-compacting concrete is poured into the top of the casting cavity, the end of the steel beam (3) is embedded and poured upward to the specified height to obtain a heightened concrete column (7) integrated with the reinforced concrete layer (10). S500: tying and heightening beam reinforcement; A web reinforcement sleeve (504) is fixed on the side of the reinforcing steel plate (6) near the beam. Multiple sets of heightened web reinforcements (801) are installed above the original concrete beam (2). The ends of the heightened web reinforcements (801) are fixed in the web reinforcement sleeve (504). The original beam stirrups are chiseled out at the top of the original concrete beam (2), and the heightened stirrups (802) are fixedly connected to the original beam stirrups. The heightened stirrups (802) are tied around the heightened waist bars (801) for fixation. S600: Cast heightened concrete beam (8); A formwork was erected above the original concrete beam (2) and concrete was poured to obtain a heightened concrete beam (8).

10. A method for increasing the height of an existing frame structure and converting it into a steel frame according to claim 9, characterized in that: A lower concrete column (13) is provided below the ground (9), and the lower concrete column (13) is located below the original concrete column (1). The lower surface of the ground (9) and the side wall of the lower concrete column (13) are both anchored with embedded plates (14), and reinforcing diagonal braces (15) are fixed between the embedded plates (14); the embedded plates (14) and the reinforcing diagonal braces (15) are set before step S100.

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