A circular steel tube concrete column-reinforced concrete transfer beam node and its arrangement method

Abstract

The present invention discloses a circular steel tube concrete column-reinforced concrete transfer beam node, comprising an outer ring support plate arranged between the circular steel tube concrete column and the reinforced concrete transfer beam, stiffening ribs under the support plate, a primary mechanical joint on the support plate, and cylindrical dowel bars; the annular steel plate of the outer ring support plate is welded around the outer edge of the top of the circular steel tube column and fixed to the steel tube via stiffening ribs; the primary mechanical joint is vertically welded to the annular steel plate, and the cylindrical dowel bars in the mechanical joint serve as cylindrical longitudinal bars within the height range of the reinforced concrete transfer beam. In the structural arrangement of the present invention, the steel tube does not extend into the area where the steel bars are arranged in the transfer beam, ensuring that the longitudinal bars of the beam can freely cross the column position; the addition of a steel support plate at the top of the steel column improves the shear bearing capacity of the column side beam end; longitudinal bars are arranged on the support plate to form a large-diameter concrete cylinder, ensuring the bending resistance of the column in the node area, making the beam-column node close to a rigid connection; a sufficient number of primary mechanical joints are welded on the annular plate to facilitate the construction operation of the cylindrical longitudinal bars.

Description

Technical Field

[0001] The present invention relates to the field of construction engineering, and in particular to a circular steel tube concrete column-reinforced concrete transfer beam node and an arrangement method thereof. Background Art

[0002] Transfer floors are a structural form in construction projects. With the development of urban construction, many buildings are becoming more multifunctional, causing some buildings to change their functions vertically along the upper floors. This can lead to vertical structural discontinuities, necessitating the addition of transfer floors within these discontinuous structures. Currently, the most widely used transfer floor structure is the beam-type transfer floor. Circular concrete-filled steel tube columns are often used for frame columns due to their high axial bearing capacity, good ductility, material savings, and ease of construction. Transfer beams, due to their high load-bearing capacity, often use large-section reinforced concrete beams or section steel concrete beams.

[0003] However, the current nodes of beam-type transfer layer structures often require that the circular steel tube concrete columns enter the transfer beams as rigid connections, which leads to conflicts between the orthogonal beam reinforcement and the circular steel tube concrete columns. The longitudinal reinforcement of the beams is difficult to anchor, which is extremely unfavorable to the stress of the transfer beams. If a large number of welding anchors are used, the construction will be inconvenient, the construction period will be long, and the quality of on-site welding will be difficult to ensure. If the circular steel tube concrete columns do not enter the beams at all and only a steel cage is added to the circular steel tube concrete columns, the bending resistance of the column head reinforced concrete is much weaker than that of the steel tube concrete columns, and the seismic requirements of strong columns and weak beams at the transfer nodes cannot be met. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and provide a circular steel tube concrete column-reinforced concrete transfer beam node. This solution welds an annular steel plate at the top edge of the circular steel tube concrete column, welds a first-level mechanical joint on the annular steel plate, and welds a stiffening rib below the annular steel plate. Since the circular steel tube concrete column does not enter the reinforced concrete transfer beam where the steel bars are arranged, it is ensured that the longitudinal steel bars in the reinforced concrete transfer beam can freely pass through the position of the column head laterally; welding an annular steel plate at the column head of the circular steel tube concrete column, on the one hand, improves the shear resistance of the reinforced concrete transfer beam end at the column side, and on the other hand, cylindrical longitudinal reinforcement is arranged in the outer ring support plate, and the steel tube concrete column is expanded to a reinforced concrete column with a larger cross-section within the beam height range, which ensures the bending resistance of the column head and makes the beam-column node close to a rigid connection; the first-level mechanical joint welded on the annular steel plate ensures the convenience of construction operation when the cylindrical longitudinal reinforcement crosses the orthogonal beam reinforcement in the later stage.

[0005] Another object of the present invention is to provide a method for arranging a circular steel tube concrete column-reinforced concrete transfer beam node.

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

[0007] A circular steel tube concrete column-reinforced concrete transfer beam node includes an outer ring support plate arranged between the circular steel tube concrete column and the reinforced concrete transfer beam, the outer ring support plate includes an annular steel plate and multiple primary mechanical joints welded to the annular steel plate; wherein the annular steel plate is welded around the outer edge of the top of the circular steel tube concrete column, and the primary mechanical joints are vertically arranged to penetrate into the cylindrical longitudinal reinforcement in the reinforced concrete transfer beam.

[0008] Preferably, a plurality of stiffening ribs are welded between the lower side of the annular steel plate and the circular concrete-filled steel tube column.

[0009] Preferably, an inner lining pipe of a preset thickness is welded to the inner edge of the top of the circular concrete-filled steel tube column.

[0010] Preferably, a plurality of the cylindrical longitudinal bars are provided with welded hoops on their outer rings, which are welded by the hoops themselves to form welded hoops, which are then hooped around the cylindrical longitudinal bars.

[0011] Preferably, the multiple primary mechanical joints are arranged at regular intervals, and are not less than the actual number of cylindrical longitudinal reinforcements, and match the cylindrical longitudinal reinforcements.

[0012] Preferably, the outer diameter of the outer ring support plate is not less than the outer diameter of the circular steel tube concrete column.

[0013] Preferably, the width of the reinforced concrete transfer beam is not less than the outer diameter of the circular concrete-filled steel tube column.

[0014] Preferably, the width of the reinforced concrete transfer beam is smaller than the outer diameter of the circular steel tube concrete column. In this case, the upper portion of the outer ring support plate is equivalent to the reinforced concrete column with an enlarged cross-section, and the reinforced concrete transfer beam is anchored into the column.

[0015] Another object of the present invention is achieved through the following technical solutions:

[0016] A method for arranging a circular steel tube concrete column-reinforced concrete transfer beam node comprises the following steps:

[0017] The steel structure of the circular steel tube concrete column-reinforced concrete transfer beam node is manufactured in the factory;

[0018] Fix the circular steel tube concrete column, weld an annular steel plate to the top edge of the circular steel tube concrete column, weld multiple primary mechanical joints above the annular steel plate, and weld multiple stiffening ribs below the annular steel plate, thereby completing the circular steel tube concrete column with an outer ring support plate;

[0019] After the circular steel tube concrete column with the outer ring support plate is in place on site, the outer ring support plate is used as a part of the template of the reinforced concrete transfer beam. The reinforced concrete transfer beam steel bars are placed on the outer ring support plate, the corresponding cylindrical longitudinal bars are inserted at the primary mechanical joint, and welded hoops are set on the outer rings of multiple cylindrical longitudinal bars. Finally, concrete is poured to form the circular steel tube concrete column-reinforced concrete transfer beam node.

[0020] The steel tube of the circular steel tube concrete column-reinforced concrete transfer beam node does not enter the reinforced concrete transfer beam where the steel bars are arranged, ensuring that the steel bars in the beam can freely pass through the column laterally; the setting of the outer ring support plate ensures the bending and shearing capacity of the node; the use of the first-level mechanical joint ensures the convenience of construction operations when the longitudinal reinforcement of the column crosses the orthogonal beam reinforcement in the later stage.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. Compared with the existing general beam-type transfer layer nodes, the present invention ensures that the steel bars in the reinforced concrete transfer beam can freely pass through the column position because the steel pipe does not enter the reinforced concrete transfer beam where the steel bars are arranged.

[0023] 2. Compared with the existing general beam-type transfer layer nodes, if the beam width is greater than the outer diameter of the column, the present invention adds an outer ring support plate to the column head to solve the problem of insufficient shear resistance of the beam end caused by the reinforced concrete transfer beam transmitting force to the column.

[0024] 3. Compared with the existing general beam-type transfer layer nodes, the present invention sets longitudinal reinforcement in the outer ring support plate, and the steel tube concrete column is expanded to a reinforced concrete column with a larger cross-section within the beam height range, ensuring the bending resistance of the column head and making the beam-column node close to a rigid connection.

[0025] 4. Compared with the existing general beam-type transfer layer nodes, the primary mechanical joint welded on the annular steel plate of the present invention ensures the convenience of construction operation when the cylindrical longitudinal reinforcement and the orthogonal beam reinforcement intersect in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional view of a circular steel tube concrete column-reinforced concrete transfer beam node according to the present invention.

[0027] Figure 2 for Figure 1 AA cross-sectional view.

[0028] Figure 3 for Figure 1 A sectional view taken through the cross section of a primary mechanical joint.

[0029] Figure 4 for Figure 1 Section view with the stiffener as the section.

[0030] The meanings of the reference numerals are as follows:

[0031] Circular steel tube concrete column 1, outer ring support plate 2, reinforced concrete transfer beam 3, annular steel plate 4, primary mechanical joint 5, stiffening rib 6, cylindrical longitudinal reinforcement 7, hoop 8. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0033] like Figure 1-4 A circular steel tube concrete column-reinforced concrete transfer beam node includes a circular steel tube concrete column 1, an outer ring support plate 2 and a reinforced concrete transfer beam 3. The outer ring support plate 2 is welded around the top outer edge of the circular steel tube concrete column 1 and includes an annular steel plate 4, a primary mechanical joint 5 and a stiffening rib 6. The primary mechanical joint 5 is reserved above the annular steel plate 4; the stiffening rib 6 is welded below. The reinforced concrete transfer beam 3 is placed above the outer ring support plate 2. Vertical cylindrical longitudinal reinforcement 7 is arranged at the primary mechanical joint 5 and inserted into the reinforced concrete transfer beam 3.

[0034] The width of the reinforced concrete transfer beam 3 is generally not less than the outer diameter of the circular steel tube concrete column 1, and may also be less than the outer diameter of the circular steel tube concrete column.

[0035] The outer diameter of the outer ring support plate 2 is not less than the outer diameter of the circular steel tube concrete column 1.

[0036] An inner lining pipe of a certain thickness is welded to the top edge of the circular steel tube concrete column 1 .

[0037] The first-level mechanical joints 5 are designed at regular intervals, are greater than the actual number of cylindrical longitudinal reinforcements 7 , and match the cylindrical longitudinal reinforcements 7 .

[0038] The stiffening ribs 6 are designed at regular intervals and meet the load calculation requirements for the transition of force transmission from the vertical cylindrical longitudinal reinforcement 7 to the steel pipe column.

[0039] Whether to set steel sections in the reinforced concrete transfer beam 3 can be determined according to calculation requirements.

[0040] The outer rings of the cylindrical longitudinal bars 7 inserted into the reinforced concrete transfer beam 3 are welded with hoop 8 , which is arranged according to design requirements.

[0041] The circular steel tube concrete column 1 enters the outer ring support plate 2 by 30mm to 50mm, generally matching the protective layer of the longitudinal reinforcement of the beam.

[0042] The cross-sectional area, spacing and position of the longitudinal reinforcement and stirrups of the reinforced concrete transfer beam 3 and the outer ring support plate 2 must comply with the provisions of the "Code for Design of Concrete Structures" (GB50010-2010), the "Code for Seismic Design of Building Structures" (GB50011-2010) and the "Technical Code for Concrete Structures of High-rise Buildings" (JGJ3-2010).

[0043] The steel structure of the circular concrete-filled steel tube column-reinforced concrete transfer beam node is generally required to be completed in the factory. The circular concrete-filled steel tube column 1 is fixed, and the outer ring support plate 2 is welded to the top edge of the column. The outer ring support plate 2 contains the annular steel plate 4, the primary mechanical joint 5 above the annular steel plate 4, and the stiffening ribs 6 below the annular steel plate 4. After the circular concrete-filled steel tube column with the outer ring support plate 2 is in place on site, the outer ring support plate 2 serves as a part of the formwork for the reinforced concrete transfer beam 3. The reinforced concrete transfer beam steel bars are placed on it, the corresponding cylindrical longitudinal bars 7 are inserted at the primary mechanical joint 5, and welded hoops 8 are set around the outer ring of the cylindrical longitudinal bars 7. Finally, concrete is poured to form the circular concrete-filled steel tube column-reinforced concrete transfer beam node.

[0044] The steel tube of the circular steel tube concrete column-reinforced concrete transfer beam node does not enter the reinforced concrete transfer beam where the steel bars are arranged, ensuring that the steel bars in the beam can freely pass through the column laterally; the setting of the outer ring support plate ensures the bending and shearing capacity of the node; the use of the first-level mechanical joint ensures the convenience of construction operations when the longitudinal reinforcement of the column crosses the orthogonal beam reinforcement in the later stage.

[0045] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A circular steel tube concrete column-reinforced concrete transfer beam node, characterized in that : It includes an outer ring support plate arranged between a circular steel tube concrete column and a reinforced concrete transfer beam, and the outer ring support plate includes an annular steel plate and a plurality of primary mechanical joints welded on the annular steel plate; wherein, The annular steel plate is welded around the outer edge of the top of the circular steel tube concrete column, the primary mechanical joint is vertically welded to the annular plate, and cylindrical longitudinal reinforcement is provided which is interspersed and anchored in the reinforced concrete transfer beam; a plurality of vertical stiffening ribs are welded between the bottom of the annular steel plate and the circular steel tube concrete column; The inner edge of the top of the circular steel tube concrete column is welded with an inner lining pipe of a preset thickness; A plurality of welding hoops are provided on the outer ring of the cylindrical longitudinal reinforcement.

2. The circular steel tube concrete column-reinforced concrete transfer beam node according to claim 1 is characterized in that : The multiple first-level mechanical joints are arranged at regular intervals and are not less than the actual number of cylindrical longitudinal reinforcements.

3. The circular concrete-filled steel tube column-reinforced concrete transfer beam node according to claim 1 is characterized in that : The outer diameter of the outer ring support plate is not less than the outer diameter of the circular steel tube concrete column.

4. The circular steel tube concrete column-reinforced concrete transfer beam node according to claim 1 is characterized in that :The width of the reinforced concrete transfer beam shall not be less than the outer diameter of the circular steel tube concrete column.

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