Assembling method for newly-added cantilever steel structure of existing concrete beam-column joint

Abstract

The invention provides an assembling method for a newly-added cantilever steel structure of an existing concrete beam-column joint. Comprising the steps that the surface of an existing concrete beam-column joint (1) is cleaned, and the existing concrete beam-column joint (1) is wrapped with a steel plate to form a steel-encased enclosure (2); an upper stiffening steel plate (6) and a lower stiffening steel plate (7) are arranged in the steel square tube short column (3); the cantilever steel beam (5) and the steel square tube short column (3) are connected in a bolt welding mode in a factory processing workshop to form a whole; the cantilever steel beam (5) is lifted to the installation height, and the steel square tube short column (3) and the steel-encased enclosure (2) are subjected to enclosure welding; and the high-performance grouting material (4) is poured into the steel square tube short column (3) through a preformed hole of the upper stiffening steel plate (7). The steel-encased enclosure is additionally arranged on the existing beam-column joint, so that the bearing capacity of the existing beam-column joint is enhanced under the condition that the integrity and the bearing capacity of the existing beam-column joint are not damaged at all; the method adopts assembly type connection, and has the advantages of convenience in construction, reliable connection quality and the like.

Description

Technical Field

[0001] The invention belongs to the field of construction, and in particular relates to an assembly method for a newly added cantilever steel structure at an existing concrete beam-column node. Background Art

[0002] With the acceleration of my country's urbanization process, how to make old urban buildings shine again and improve the city's image. Urban renewal and renovation will become the mainstream direction of current urban construction. In the renovation and renewal of urban buildings, diversified renovation of facades has become the norm. Usually, it is achieved by adding cantilevered steel structures to the facades.

[0003] The traditional approach to dealing with this type of technical problem is to plant reinforcement at the existing beam-column joint or to install anchor plates on the outer skin of the column. The traditional approach inevitably requires planting reinforcement and drilling holes at the existing beam-column joint. This approach has the following disadvantages: (1) Planting reinforcement or drilling holes will damage the integrity and bearing capacity of the existing beam-column joint; (2) The existing beam-column joint is densely reinforced, and the location of planting reinforcement or drilling holes cannot be guaranteed; (3) The anchor plate is welded to the steel beam at high altitude, and the construction quality is difficult to guarantee; (4) The anchor plate is prone to local instability when bearing the load transmitted from the steel beam; (5) Due to the limitations on the number of planted reinforcements and the size of the anchor plate, the bearing capacity of the newly added cantilever steel structure is limited.

[0004] Based on the above-mentioned technical deficiencies, there is an urgent need for an assembled connection method that solves the above-mentioned technical problems. Summary of the invention

[0005] The purpose of the invention is to provide an assembly method for a newly added cantilever steel structure at an existing concrete beam-column joint.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention relates to an assembly method for a newly added cantilever steel structure at an existing concrete beam-column node, comprising the following steps:

[0008] The first step is to clean and polish the surface decoration layer of the existing concrete beam-column node 1, and then use the existing beam-column node 1 as a basis to cover it with steel plates to form an outer steel casing 2;

[0009] The second step is to manufacture a steel square tube short column 3 in a factory processing workshop, and to set an upper stiffening steel plate 6 and a lower stiffening steel plate 7 inside the steel square tube short column 3, and to set the same height as the upper and lower flanges of the steel beam;

[0010] The third step is to connect the cantilever steel beam 5 with the steel square tube short column 3 by bolting and welding in the factory processing workshop to form a whole;

[0011] The fourth step is to perform hoisting and splicing at the construction site, hoist the cantilever steel beam 5 to the installation height, and weld the steel square tube short column 3 and the outer steel surrounding sleeve 2;

[0012] The fifth step is to pour high-performance grouting material 4 into the steel square tube short column 3 through the reserved holes of the upper stiffening steel plate 7.

[0013] Preferably, in the first step, the thickness of the steel plate is 2 cm and the material is Q355B grade.

[0014] Preferably, in the first step, the outer steel casing 2 adopts a single-sided groove weld.

[0015] Preferably, in the second step, the height of the steel square tube short column 3 is 10 cm greater than the height of the cantilever steel beam 5 .

[0016] Preferably, in the fourth step, the circumference welding is specifically performed by fillet weld circumference welding.

[0017] Preferably, in the fourth step, the weld height of the circumferential welding is not less than 10 mm.

[0018] The present invention has the following advantages:

[0019] (1) The present invention adds an outer steel sleeve to the existing beam-column node, thereby enhancing the bearing capacity of the existing beam-column node (the original node becomes a steel concrete node) without completely destroying the integrity and bearing capacity of the existing beam-column node;

[0020] (2) The size of the steel square tube short column provided in the present invention can be adjusted according to the bearing capacity required by the cantilever steel structure; if the load of the cantilever steel structure is large, the specification size of the steel square tube short column can be enlarged, and the length of the corner weld between the steel square tube short column and the steel sleeve outside the column is increased. The longer the weld length, the higher the bearing capacity.

[0021] (3) The method involved in the present invention is based on an ingenious design of the force. When the cantilever steel beam is under force, the load is first transferred to the steel square tube short column filled with high-performance grouting material. Compared with the steel plate, the steel square tube short column has better rigidity and strength, and will not suffer from local compressive damage and instability.

[0022] (4) The present invention assembles and connects the new cantilever steel beam and the steel square tube short column in the factory, and hoisting and installing on site, with less high-altitude work and reliable connection quality;

[0023] (5) The connection method proposed by the present invention has an ingenious and clear force transmission path and a reliable connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a top view of the assembly of the present invention;

[0025] Figure 2 It is a front view of the assembly of the present invention;

[0026] Figure 3 is a top view of the welding assembly of the present invention;

[0027] Figure 4 It is a welded front view of the assembly of the present invention;

[0028] The attached drawings are marked as follows: 1 is the existing beam-column node, 2 is the external steel sleeve, 3 is the steel square tube short column, 4 is the high-performance grouting material, 5 is the cantilever steel beam, 6 is the upper stiffening steel plate, and 7 is the lower stiffening steel plate. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with specific embodiments. It should be noted that the following embodiments are only further descriptions of the present invention, but the protection scope of the present invention is not limited to the following embodiments.

[0030] Example

[0031] This embodiment relates to an assembly method for adding a cantilever steel structure to an existing concrete beam-column node, such as Figure 1-Figure 4 As shown, the following steps are included:

[0032] The first step is to clean and polish the surface decoration layer of the existing concrete beam-column node 1, and then use the existing beam-column node 1 as a basis to form an outer steel casing 2 with a steel plate (the thickness of the steel plate is 2 cm and the material is Q355B grade); the outer steel casing 2 adopts a single-sided groove weld;

[0033] The second step is to make a steel square tube short column 3 in the factory processing workshop, and set an upper stiffening steel plate 6 and a lower stiffening steel plate 7 inside the steel square tube short column 3 (the height is 10 cm greater than the height of the cantilever steel beam 5), and the setting position is at the same height as the upper and lower flanges of the steel beam;

[0034] The third step is to connect the cantilever steel beam 5 with the steel square tube short column 3 by bolting and welding in the factory processing workshop to form a whole;

[0035] The fourth step is to perform hoisting and splicing on the construction site, hoist the cantilever steel beam 5 to the installation height, and perform fillet welding of the steel square tube short column 3 and the outer steel surrounding sleeve 2 (the weld height is not less than 10 mm);

[0036] The fifth step is to pour high-performance grouting material 4 into the steel square tube short column 3 through the reserved holes of the upper stiffening steel plate 7.

[0037] Compared with the prior art, the present invention has the following advantages: the present invention adds an external steel casing to the existing beam-column node, and enhances the bearing capacity of the existing beam-column node (the original node becomes a steel-concrete node) without completely destroying the integrity and bearing capacity of the existing beam-column node; the method involved in the present invention is based on the ingenious design of the force, when the cantilever steel beam is under force, the load is first transferred to the steel square tube short column filled with high-performance grouting material, the steel square tube short column has good rigidity and strength compared to the steel plate, and will not be locally compressed and damaged or instable. The present invention assembles and connects the new cantilever steel beam and the steel square tube short column in the factory, hoisting and installing on site, less high-altitude work, and reliable connection quality; the connection method proposed by the present invention has an ingenious and clear force transmission path, and reliable connection.

[0038] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A method for assembling a cantilever steel structure at an existing concrete beam-column joint, characterized in that: The following steps are involved: The first step is to clean and polish the surface decoration layer of the existing concrete beam-column joint (1), and then use the existing beam-column joint (1) as a basis to cover it with steel plates to form an outer steel casing (2); The second step is to manufacture a steel square tube short column (3) in a factory processing workshop, and to arrange an upper stiffening steel plate (6) and a lower stiffening steel plate (7) inside the steel square tube short column (3); The third step is to connect the cantilever steel beam (5) and the steel square tube short column (3) by bolting and welding in the factory processing workshop to form a whole; The fourth step is to carry out hoisting and splicing at the construction site, hoist the cantilever steel beam (5) to the installation height, and weld the steel square tube short column (3) and the outer steel surrounding sleeve (2); The fifth step is to pour high-performance grouting material (4) into the steel square tube short column (3) through the reserved holes of the upper stiffening steel plate (7).

2. The method for assembling a newly added cantilever steel structure at an existing concrete beam-column joint as claimed in claim 1, characterized in that: In the first step, the thickness of the steel plate is 2 cm and the material is Q355B grade.

3. The method for assembling a newly added cantilever steel structure at an existing concrete beam-column joint as claimed in claim 1, characterized in that: In the first step, the outer steel casing (2) is welded with a single-sided groove.

4. The method for assembling a newly added cantilever steel structure at an existing concrete beam-column joint as claimed in claim 1, characterized in that: In the second step, the height of the steel square tube short column (3) is 10 cm greater than the height of the cantilever steel beam (5).

5. The method for assembling a newly added cantilever steel structure at an existing concrete beam-column joint as claimed in claim 1, characterized in that: In the fourth step, the circumferential welding is specifically performed by using fillet weld circumferential welding.

6. The method for assembling a newly added cantilever steel structure at an existing concrete beam-column joint as claimed in claim 1, characterized in that: In the fourth step, the weld height of the circumferential welding is not less than 10 mm.

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