Construction method for adding steel structural columns on existing concrete structural columns

Abstract

This invention discloses a construction method for adding a steel structure column to an existing concrete structural column. The method involves removing the protective layer of the column head reinforcement to expose it; providing multiple core reinforcement bars and multiple outer reinforcement bars, which are then welded to the column head reinforcement; providing an embedded steel plate with multiple through holes, the positions of which correspond one-to-one with the positions of the first vertical segments of the core reinforcement bars and the second vertical segments of the outer reinforcement bars; inserting the first vertical segments of the core reinforcement bars and the second vertical segments of the outer reinforcement bars into the through holes of the embedded steel plate; adjusting the level of the embedded steel plate and welding the first and second vertical segments to it; injecting grout between the embedded steel plate and the existing concrete structural column; and hoisting and installing the steel structure column onto the embedded steel plate. This invention solves the problem of low construction efficiency when adding a steel structure column to an existing concrete structural column.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a construction method for adding steel structural columns to existing concrete structural columns. Background Technology

[0002] As buildings age, structural aging, increased loads, and changes in function lead to the need for renovation and expansion. For projects adding steel columns to existing concrete columns, the traditional construction process involves fixing steel column bases with rebar, then welding the steel column to the bases. The steps for rebar installation at the concrete column head are as follows: grinding and repairing the concrete surface of the column head, positioning and marking the rebar holes, drilling holes at the designated locations with an impact drill (the holes must be vertical and deep enough to meet design requirements), removing dust with a vacuum cleaner, cleaning the holes with alcohol or acetone, injecting rebar adhesive, slowly rotating and inserting the anchor bolts, and curing. Due to the dense rebar at the column head, this process has low drilling efficiency and poor rebar installation results. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, a construction method for adding steel structural columns to existing concrete structural columns is provided to solve the problem of low construction efficiency in existing concrete structural columns.

[0004] To achieve the above objectives, a construction method for adding steel structural columns to existing concrete structural columns is provided, comprising the following steps:

[0005] Remove the protective layer of the column head reinforcement of the existing concrete structural column to expose the column head reinforcement.

[0006] Multiple core bars and multiple outer edge bars are provided. The two ends of the core bars are turned up to form a first vertical section, and one end of the outer edge bars is turned up to form a second vertical section. The multiple core bars and the multiple outer edge bars are welded to the column head reinforcement. The multiple core bars are located at the middle of the upper end of the existing concrete structural column, and the multiple outer edge bars are located at the outer edge of the upper end of the existing concrete structural column.

[0007] A pre-embedded steel plate is provided, and multiple through holes are made on the pre-embedded steel plate. The positions of the multiple through holes correspond one-to-one with the positions of the first vertical sections of the multiple core ribs and the second vertical sections of the multiple outer edge ribs.

[0008] The first vertical section of the multiple core ribs and the second vertical section of the multiple outer edge ribs are respectively inserted into the holes of the pre-embedded steel plate;

[0009] Adjust the levelness of the embedded steel plate, and weld the first vertical section and the second vertical section to the embedded steel plate;

[0010] Grouting material is injected between the embedded steel plate and the existing concrete structural column;

[0011] The steel structure columns are hoisted and installed on the pre-embedded steel plates.

[0012] Furthermore, the core reinforcement and the outer edge reinforcement are respectively connected to the column head reinforcement by double-sided full welding.

[0013] Furthermore, the multiple core reinforcement bars are arranged in the same direction, and the length of the multiple core reinforcement bars gradually shortens from the center of the existing concrete structural column to both sides.

[0014] Furthermore, the core rib and the outer edge rib are set at an angle.

[0015] Furthermore, the core rib is perpendicular to the outer edge rib.

[0016] Furthermore, the first vertical section and the second vertical section are connected to the embedded steel plate by perforated plug welding.

[0017] The beneficial effects of this invention are as follows: The construction method for adding a steel structure column to an existing concrete structural column involves removing the protective layer of the column head reinforcement to expose it during construction. Then, core reinforcement and edge reinforcement are welded to the column head reinforcement. Specifically, the core and edge reinforcement are fully welded to the column head reinforcement on both sides. Embedded steel plates are connected to the core and edge reinforcement via through-hole plug welding. Thus, the steel structure column is securely connected to the existing concrete structural column through the embedded steel plates, core reinforcement, and edge reinforcement, ensuring the structural safety of the added steel structure column. This invention is simple to operate, safe, and reliable, effectively solving the problem of difficult rebar installation caused by the dense reinforcement at the column head of the existing concrete structure, and shortening the construction period and reducing costs. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of a construction method for adding steel structural columns to existing concrete structural columns in an embodiment of the present invention.

[0020] Figure 2 This is a top view of the embedded steel plate of the circular steel structure column according to an embodiment of the present invention.

[0021] Figure 3 This is a top view of the embedded steel plate of the rectangular steel structure column according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the core rib in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the edge reinforcement in an embodiment of the present invention. Detailed Implementation

[0024] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Reference Figures 1 to 5 As shown, this invention provides a construction method for adding steel structural columns to existing concrete structural columns, including the following steps:

[0027] S1. Remove the protective layer of the column head reinforcement of the existing concrete structural column 4 to expose the column head reinforcement.

[0028] S2. Provide multiple core bars 1 and multiple outer bars 2. The two ends of the core bars 1 are turned up to form a first vertical section 11, and one end of the outer bars 2 is turned up to form a second vertical section 21. The multiple core bars 1 and multiple outer bars 2 are welded to the column head reinforcement. The multiple core bars 1 are set at the middle position of the upper end of the existing concrete structural column 4, and the multiple outer bars 2 are set at the outer edge position of the upper end of the existing concrete structural column 4.

[0029] As a preferred embodiment, the core reinforcement 1 and the outer edge reinforcement 2 are respectively connected to the column head reinforcement by double-sided full welding.

[0030] As a preferred implementation, multiple core reinforcement bars 1 are arranged in the same direction, and the length of the multiple core reinforcement bars 1 gradually shortens from the center of the existing concrete structural column 4 to both sides.

[0031] In a preferred embodiment, the core rib 1 and the outer edge rib 2 are arranged at an angle. Specifically, in this embodiment, the core rib 1 is perpendicular to the outer edge rib 2.

[0032] In a preferred embodiment, the first vertical section 11 and the second vertical section 21 are connected to the embedded steel plate 3 by perforation plug welding.

[0033] S3. Provide a pre-embedded steel plate 3, and make multiple through holes on the pre-embedded steel plate 3. The positions of the multiple through holes correspond one-to-one with the positions of the first vertical section 11 of the multiple core ribs 1 and the second vertical section 21 of the multiple outer edge ribs 2.

[0034] S4. The first vertical section 11 of the multiple core reinforcement bars 1 and the second vertical section 21 of the multiple outer edge reinforcement bars 2 are respectively inserted into the holes of the pre-embedded steel plate 3.

[0035] S5. Adjust the level of the embedded steel plate 3, and weld the first vertical section 11 and the second vertical section 21 to the embedded steel plate 3.

[0036] S6. Grouting material is injected between the pre-embedded steel plate 3 and the existing concrete structural column 4.

[0037] In some embodiments, the embedded steel plate is circular, such as... Figure 2 As shown; in other embodiments, the embedded steel plate is rectangular, such as... Figure 3 As shown.

[0038] In some embodiments, the bottom of the embedded steel plate is shaped like a pyramid or frustum, so that the sloping surface of the bottom of the embedded steel plate gradually contacts the grouting material, thereby making the grouting dense and reducing the generation of grouting air bubbles. The grouting material is a conventional technology and will not be described in detail here.

[0039] Preferably, the bottom of the embedded steel plate is arc-shaped (or spherical).

[0040] S7. Hoist the steel structure column 5 and install it on the pre-embedded steel plate 3.

[0041] This invention discloses a construction method for adding steel structural columns to existing concrete structural columns. During construction, the protective layer of the column head reinforcement in the existing concrete structural column is removed to expose the column head reinforcement. Then, core reinforcement and edge reinforcement are welded to the column head reinforcement. The core and edge reinforcement are fully welded to the column head reinforcement on both sides. Pre-embedded steel plates are connected to the core and edge reinforcement via through-hole plug welding. Thus, the steel structural column is securely connected to the existing concrete structural column through the pre-embedded steel plates, core reinforcement, and edge reinforcement, ensuring the structural safety of the added steel structural column. This invention is simple to operate, safe, and reliable, effectively solving the problem of difficult rebar installation caused by the dense reinforcement at the column head of the existing concrete structure, and shortening the construction period and reducing costs.

[0042] The present invention discloses a construction method for adding steel structure columns to existing concrete structural columns. The method employs double-sided full welding of core and edge reinforcement to the column head reinforcement, while pre-embedded steel plates are connected to the core and edge reinforcement via through-hole plug welding. This avoids the need for rebar installation and drilling, effectively solving the problem of difficulty in installing rebar at the column foot of existing concrete structural columns in renovation projects due to the dense column head reinforcement. It also avoids damage to the original column head reinforcement caused by drilling, thus accelerating construction progress, improving construction quality, and saving project costs.

[0043] The present invention provides a construction method for adding steel structural columns to existing concrete structural columns. By controlling the welding process, the bonding strength between the embedded parts of the steel structural column base and the existing concrete column is guaranteed. This method is safe and reliable, has a simple construction process, saves labor, and can achieve the goal of rapid construction.

[0044] The present invention discloses a construction method for adding steel structural columns to existing concrete structural columns. The method begins with material preparation: Core and edge reinforcement bars are bent according to design drawings, and holes are drilled in pre-embedded steel plates for through-hole plug welding of the core and edge reinforcement bars. Next, the concrete protective layer of the existing column head is removed to expose the column head reinforcement bars, and surface dust and slag are cleaned. According to the drawings, the core and edge reinforcement bars are fixed above the column head reinforcement bars and fully welded to both sides. Pre-embedded steel plates are inserted above the core and edge reinforcement bars, and after confirming the horizontal and vertical positioning of the steel plates, they are through-hole plug welded to the core and edge reinforcement bars. Grouting material is injected into the gap between the column base embedded parts and the existing concrete structure to fill the gap. Finally, the steel structural column is hoisted and welded.

[0045] This invention makes extensive use of welding technology. During construction, each welding process must be inspected and approved before the next process can be carried out to ensure that the on-site welding quality meets the design requirements.

[0046] The construction method for adding steel structural columns to existing concrete structural columns of the present invention has a good fixing effect on steel structural columns and is also applicable to adding steel structural columns (beams) to existing concrete structures in other areas with dense reinforcement, and has strong promotional value.

[0047] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A construction method for adding steel structural columns to existing concrete structural columns of a building, characterized in that, Includes the following steps: Remove the protective layer of the column head reinforcement of the existing concrete structural column to expose the column head reinforcement. Multiple core bars and multiple outer edge bars are provided. The two ends of the core bars are turned up to form a first vertical section, and one end of the outer edge bars is turned up to form a second vertical section. The multiple core bars and the multiple outer edge bars are welded to the column head reinforcement. The multiple core bars are located at the middle of the upper end of the existing concrete structural column, and the multiple outer edge bars are located at the outer edge of the upper end of the existing concrete structural column. A pre-embedded steel plate is provided, and multiple through holes are made on the pre-embedded steel plate. The positions of the multiple through holes correspond one-to-one with the positions of the first vertical sections of the multiple core ribs and the second vertical sections of the multiple outer edge ribs. The first vertical section of the multiple core ribs and the second vertical section of the multiple outer edge ribs are respectively inserted into the holes of the pre-embedded steel plate; Adjust the levelness of the embedded steel plate, and weld the first vertical section and the second vertical section to the embedded steel plate; Grouting material is injected between the embedded steel plate and the existing concrete structural column; The steel structure columns are hoisted and installed on the pre-embedded steel plates.

2. The construction method for adding steel structural columns to existing concrete structural columns according to claim 1, characterized in that, The core reinforcement and the outer edge reinforcement are respectively connected to the column head reinforcement by double-sided full welding.

3. The construction method for adding steel structural columns to existing concrete structural columns according to claim 1, characterized in that, The multiple core reinforcement bars are arranged in the same direction, and the length of the multiple core reinforcement bars gradually shortens from the center of the existing concrete structural column to both sides.

4. The construction method for adding steel structural columns to existing concrete structural columns according to claim 1, characterized in that, The core reinforcement and the outer edge reinforcement are set at an angle.

5. The construction method for adding steel structural columns to existing concrete structural columns according to claim 4, characterized in that, The core reinforcement is perpendicular to the outer edge reinforcement.

6. The construction method for adding steel structural columns to existing concrete structural columns according to claim 1, characterized in that, The first vertical section and the second vertical section are connected to the embedded steel plate by perforated plug welding.

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