CN114319584A - A circular concrete-filled steel tubular column-reinforced concrete transition beam joint and its arrangement method - Google Patents

Abstract

The invention discloses a round steel tube concrete column-reinforced concrete conversion beam node, which comprises an outer ring supporting plate, a stiffening rib, a primary mechanical joint and a cylindrical dowel bar, wherein the outer ring supporting plate is arranged between the round steel tube concrete column and the reinforced concrete conversion beam; the annular steel plate of outer loop layer board welds outward flange a week at the circular steel tubular column top, through stiffening rib rigid coupling on the steel pipe, the vertical welding of one-level mechanical joint is on annular steel plate, and the cylinder dowel bar in the mechanical joint is as the cylinder longitudinal bar of reinforced concrete conversion roof beam height scope. In the structural arrangement, the steel pipe does not extend into the position where the steel bar is arranged in the conversion beam, so that the beam longitudinal bar can freely cross the column position; the steel supporting plate is added at the top of the steel column, so that the shearing bearing capacity of the side beam end of the column is improved; longitudinal ribs are arranged on the supporting plate to form a large-diameter concrete cylinder, so that the bending resistance of the column in the node area is ensured, and the beam-column node is close to rigid connection; and enough primary mechanical joints are welded on the annular plate, so that the construction operation of the cylindrical longitudinal ribs is facilitated.

Description

A circular concrete-filled steel tubular column-reinforced concrete transition beam joint and its arrangement method

technical field

The invention relates to the field of construction engineering, in particular to a circular steel tube concrete column-reinforced concrete conversion beam joint and an arrangement method thereof.

Background technique

The transfer floor is a structural form in construction projects. With the construction and development of cities, the needs of many buildings are developing towards multi-functionality, which makes the functions of some buildings change vertically along the high-rise, thus causing the problem of vertical structure discontinuity. , therefore, a conversion layer needs to be added in the middle of the discontinuous structure. At present, the most widely used is the beam-type transfer layer structure; in addition, the circular concrete-filled steel tubular column is often used for the frame column because of its high axial bearing capacity, good ductility, material saving, and convenient construction. Large-section reinforced concrete beams or profiled steel concrete beams are often used.

However, in the current beam-type transfer layer structure, the rigid connection requirements are often that the circular steel tube concrete column enters the conversion beam, resulting in the conflict between the orthogonal beam reinforcement and the circular steel tube concrete column, and the beam longitudinal reinforcement is difficult to anchor, which is extremely unfavorable for the conversion beam. If a large number of welding anchors are used, the construction is inconvenient, the construction period is long, and the quality of on-site welding is difficult to ensure; The bending capacity is much weaker than that of CFST columns, which cannot guarantee the seismic requirements of strong columns and weak beams at transition nodes.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a circular steel tube concrete column-reinforced concrete conversion beam joint, and this scheme welds an annular steel plate on the top edge of the circular steel tube concrete column, and welds a circular steel tube on the annular steel plate. The joint arrangement method of welding the stiffener under the ring steel plate, because the circular CFST column does not enter the place where the steel bars are arranged in the reinforced concrete transfer beam, it is ensured that the longitudinal steel bars in the reinforced concrete transfer beam can freely pass through the position of the column head. ; Welding annular steel plate at the column head of the CFST column, on the one hand, improves the shear capacity of the beam end of the reinforced concrete conversion beam at the side of the column, on the other hand, the column longitudinal reinforcement is set in the outer ring support plate, and the CFST column is expanded to a higher range in the beam height range. The large-section reinforced concrete column ensures the bending resistance of the column head, making the beam-column joint close to the rigid connection; the first-class mechanical joint welded on the annular steel plate ensures the convenience of construction and operation when the column longitudinal bars and the orthogonal beam bars intersect in the later stage.

Another object of the present invention is to provide a method for arranging a CFST column-reinforced concrete transition beam joint.

The object of the present invention is achieved through the following technical solutions:

A circular steel tube concrete column-reinforced concrete conversion beam node, comprising an outer ring support plate arranged between the circular steel tube concrete column and the reinforced concrete conversion beam, the outer ring support plate comprises a ring steel plate and a plurality of multi-component welded on the ring steel plate. A first-level mechanical joint; wherein, the annular steel plate is welded around the outer edge of the top of the CFST column, and the first-level mechanical joint is vertically arranged with cylindrical longitudinal bars interspersed into the reinforced concrete conversion beam.

Preferably, a plurality of stiffening ribs are welded between the bottom of the annular steel plate and the CFST column.

Preferably, the inner edge of the top of the CFST column is welded with a lining pipe with a preset thickness.

Preferably, the outer rings of the plurality of cylindrical longitudinal ribs are provided with welding hoops. The stirrups are welded and formed by themselves to form welded hoops, which are then hooped outside the cylindrical longitudinal bars.

Preferably, the plurality of primary mechanical joints are arranged at regular intervals, not less than the actual number of cylindrical longitudinal ribs, and matched with the cylindrical longitudinal ribs.

Preferably, the outer diameter of the outer ring support plate is not less than the outer diameter of the CFST column.

Preferably, the width of the reinforced concrete conversion beam is not less than the outer diameter of the CFST column.

Preferably, the width of the reinforced concrete conversion beam is smaller than the outer diameter of the CFST column. At this time, the part of the outer ring supporting plate is equivalent to the reinforced concrete column after the enlarged section, and the reinforced concrete conversion beam is anchored into the column.

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

A method for arranging a CFST column-reinforced concrete conversion beam joint, comprising the following steps:

The steel structure part of the CFST column-reinforced concrete conversion beam joint is completed in the factory;

Fix the CFST column, weld a ring-shaped steel plate on the top edge of the CFST column, weld multiple primary mechanical joints above the annular steel plate, and weld multiple stiffeners below, thus completing the CFST with outer ring support plate column;

After the CFST column with the outer ring support plate is in place on site, the outer ring support plate is used as a part of the reinforced concrete conversion beam formwork, the reinforced concrete conversion beam steel bars are placed on the outer ring support plate, and the corresponding steel bars are inserted at the primary mechanical joints. Welded hoops are set on the outer circles of multiple cylindrical longitudinal bars, and finally concrete is poured to form a circular concrete-filled steel tubular column-reinforced concrete conversion beam joint.

The steel tube of the CFST column-reinforced concrete transfer beam joint does not enter the place where the steel bars are arranged in the reinforced concrete transfer beam, which ensures that the steel bars in the beam can freely pass through the column horizontally; the setting of the outer ring support plate ensures the bending resistance at the node. capacity and shear resistance; the use of first-class mechanical joints ensures the convenience of construction and operation when the column longitudinal bars and the orthogonal beam bars intersect in the later stage.

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

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

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

3. Compared with the existing general beam-type transition layer nodes, the present invention sets longitudinal bars in the outer ring support plate, and the CFST column is expanded into a reinforced concrete column with a larger section in the beam height range, which ensures the bending resistance of the column head. , so that the beam-column connection is close to the rigid connection.

4. Compared with the existing general beam-type transition layer nodes, the first-class mechanical joint welded on the annular steel plate of the present invention ensures the convenience of construction operation when the cylindrical longitudinal bars and the orthogonal beam bars intersect in the later stage.

Description of drawings

FIG. 1 is a cross-sectional view of a CFST column-reinforced concrete transition beam joint according to the present invention.

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 .

FIG. 3 is a cross-sectional view of FIG. 1 with the cross-section of the primary mechanical joint as a cross-section.

FIG. 4 is a cross-sectional view of FIG. 1 with the stiffening rib as a cross-section.

Among them, the meanings of the reference signs are as follows:

Circular concrete-filled steel tubular column 1, outer ring support plate 2, reinforced concrete conversion beam 3, annular steel plate 4, primary mechanical joint 5, stiffener 6, cylindrical longitudinal bar 7, hoop 8.

Detailed ways

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

As shown in Figures 1-4, a circular concrete-filled steel tubular column-reinforced concrete conversion beam node includes a circular concrete-filled steel tubular column 1, an outer ring support plate 2 and a reinforced concrete conversion beam 3, and the outer ring support plate 2 surrounds the circular steel pipe The outer edge of the top of the concrete column 1 is welded for one week, and includes an annular steel plate 4, a first-class mechanical joint 5 and a stiffening rib 6. The first-class mechanical joint 5 is reserved above the annular steel plate 4; The reinforced concrete conversion beam 3 is placed above the outer ring support plate 2 , and vertical cylindrical longitudinal bars 7 are arranged at the primary mechanical joint 5 to be inserted into the reinforced concrete conversion beam 3 .

The width of the reinforced concrete conversion beam 3 is generally not less than the outer diameter of the circular CFST column 1, and may also be smaller than the outer diameter of the circular CFST column.

The outer diameter of the outer ring support plate 2 is not less than the outer diameter of the CFST column 1 .

The inner top edge of the circular steel tubular concrete column 1 is welded with a certain thickness of inner lining pipe.

The first-level mechanical joints 5 are designed at regular intervals, more than the actual number of cylindrical longitudinal ribs 7 , and matched with the cylindrical longitudinal ribs 7 .

The stiffening ribs 6 are designed at regular intervals, and meet the force calculation requirements of the transition from the vertical column longitudinal bars 7 to the steel tube column.

The reinforced concrete conversion beam 3 may be provided with section steel according to calculation requirements.

The outer ring of the cylindrical longitudinal bars 7 interspersed in the reinforced concrete conversion beam 3 is welded with a hoop 8, and the hoop 8 is set according to the design requirements.

The circular steel tubular concrete column 1 enters the outer ring support plate 2 by 30 mm to 50 mm, which is generally matched with the protective layer of the longitudinal reinforcement of the beam.

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

The steel structure part of the CFST column-reinforced concrete conversion beam joint is generally required to be completed in the factory. The CFST column 1 is fixed, and the outer ring support plate 2 is welded on the top edge of the column. The annular steel plate contained in the outer ring support plate 2 4 and the primary mechanical joint 5 above the annular steel plate 4 and the stiffener 6 below. After the CFST column with the outer ring support plate 2 is in place on site, the outer ring support plate 2 is used as a part of the reinforced concrete conversion beam 3 formwork, and the reinforced concrete conversion beam steel bars are placed on it, and inserted at the primary mechanical joint 5 For the corresponding cylindrical longitudinal bars 7, a welding hoop 8 is arranged on the outer ring of the cylindrical longitudinal bars 7, and finally concrete is poured to form a circular steel tubular concrete column-reinforced concrete conversion beam joint.

The steel tube of the CFST column-reinforced concrete transfer beam joint does not enter the place where the steel bars are arranged in the reinforced concrete transfer beam, which ensures that the steel bars in the beam can freely pass through the column horizontally; the setting of the outer ring support plate ensures the bending resistance at the node. capacity and shear resistance; the use of first-class mechanical joints ensures the convenience of construction and operation when the column longitudinal bars and the orthogonal beam bars intersect in the later stage.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.

Claims (9)

1. a circular steel tube concrete column-reinforced concrete conversion beam node, it is characterized in that: comprise the outer ring support plate that is arranged between circular steel tube concrete column, reinforced concrete conversion beam, described outer ring support plate comprises annular steel plate and welding A plurality of primary mechanical joints on the annular steel plate; wherein, the annular steel plate is welded around the outer edge of the top of the CFST column, the first-level mechanical joints are vertically welded on the annular plate, and interspersed and anchored on the Cylindrical longitudinal reinforcement in reinforced concrete conversion beams. 2 . The CFST column-reinforced concrete conversion beam joint according to claim 1 , wherein a plurality of vertical stiffeners are welded between the bottom of the annular steel plate and the CFST column. 3 . 3 . The circular CFST column-reinforced concrete conversion beam joint according to claim 1 , wherein the inner edge of the top of the circular CFST column is welded with a lining pipe with a preset thickness. 4 . 4 . The CFST column-reinforced concrete conversion beam joint according to claim 1 , wherein a plurality of welding hoops are arranged on the outer ring of the cylindrical longitudinal bars. 5 . 5 . The circular concrete-filled steel tubular column-reinforced concrete conversion beam joint according to claim 1 , wherein the plurality of primary mechanical joints are arranged at regular intervals and not less than the actual number of cylindrical longitudinal bars. 6 . 6 . The CFST column-reinforced concrete conversion beam joint according to claim 1 , wherein the outer diameter of the outer ring support plate is not less than the outer diameter of the CFST column. 7 . 7 . The CFST column-reinforced concrete conversion beam joint according to claim 1 , wherein the width of the reinforced concrete conversion beam is not less than the outer diameter of the CFST column. 8 . 8 . The CFST column-reinforced concrete conversion beam joint according to claim 1 , wherein the width of the reinforced concrete conversion beam is smaller than the outer diameter of the CFST column. 9 . 9. A method for arranging a CFST column-reinforced concrete conversion beam node, comprising the following steps: The steel structure part of the CFST column-reinforced concrete conversion beam joint is completed in the factory; Fix the CFST column, weld a ring-shaped steel plate on the top edge of the CFST column, weld multiple primary mechanical joints above the annular steel plate, and weld multiple stiffeners below, thus completing the CFST with outer ring support plate column; After the CFST column with the outer ring support plate is in place on site, the outer ring support plate is used as a part of the reinforced concrete conversion beam formwork, the reinforced concrete conversion beam steel bars are placed on the outer ring support plate, and the corresponding steel bars are inserted at the primary mechanical joints. A number of hoops are set on the outer ring of the cylindrical longitudinal reinforcement, and finally concrete is poured to form a circular concrete-filled steel tubular column-reinforced concrete conversion beam joint.

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