CN108755964B - A partially prefabricated assembled steel-concrete mixed column and construction method - Google Patents

Abstract

The invention adopts the idea of partially prefabricated and assembled partially cast-in-place, and discloses a partially prefabricated assembled steel-concrete mixed column, which includes a prefabricated high-performance concrete hollow column; longitudinal bars arranged in the prefabricated high-performance concrete hollow column along the column length direction , section steel and steel plate, wherein the steel plate is arranged on the section steel to form a honeycomb hollow structure; stirrups laid at equal intervals; cast-in-place concrete filled in the central cavity of the prefabricated high-performance concrete hollow column; End plates and high-strength bolts at both ends of the lower prefabricated high-performance concrete hollow column; the invention also provides a construction method thereof. The invention has the advantages of light weight, high bearing capacity, no need for internal formwork, improved construction speed, reduced difficulty in structural assembly at the construction site, improved deformation ability of components during transportation and hoisting, reduced hoisting difficulty, etc. Mechanical performance and service performance of prefabricated steel-concrete components.

Description

A partially prefabricated assembled steel-concrete mixed column and construction method

technical field

The invention belongs to the technical field of construction, in particular to a partially prefabricated assembled steel-concrete mixed column and a construction method.

Background technique

Steel Reinforced Concrete Structure (often translated as Steel Reinforced Concrete Structure), also known as Steel Reinforced Concrete Structure or Stiff Reinforced Concrete Structure, SRC Structure for Short . Compared with the steel structure, the steel reinforced concrete structure is wrapped with reinforced concrete, which can significantly improve the plane torsional buckling performance of the steel, and at the same time improve the durability and fire resistance of the structure; compared with the reinforced concrete structure, the steel reinforced concrete structure can effectively reduce Small section size and improved seismic performance. Steel-concrete structures are favored by engineers because of their superior mechanical properties and relatively low economic costs. my country's steel-concrete structures are developing rapidly, and they are widely used in super high-rise, long-span structures and heavy-duty industrial buildings, such as Guangzhou International Automobile Building, Shanghai World Financial Building, Xi'an Information Center Building, Shanghai Senmao Building, Shanghai Jinmao University , Xiamen Shanghai World Financial Center and other projects all use steel and concrete structures. However, due to the numerous construction procedures and complex structural connections of the reinforced concrete structure, the popularization and application of the reinforced concrete structure has been greatly restricted.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a partially prefabricated assembled steel-concrete mixed column and a construction method, adopting the idea of partially prefabricated and assembled partially cast-in-place, the prefabricated steel-concrete mixed column in the factory can be used at the construction site The concrete is installed and poured on site, connected with the upper and lower columns through end plates and high-strength bolts, and can also be connected with beams and slabs through high-strength bolts and outrigger steel beams. It is suitable for various engineering needs, with simple construction, low cost and excellent performance. .

In order to achieve the above object, the technical scheme adopted in the present invention is:

A partially prefabricated assembled steel-concrete mixed column is characterized in that, comprising:

Prefabricated high performance concrete hollow column 1;

longitudinal bars 2 arranged in the prefabricated high-performance concrete hollow column 1 along the length of the column;

The section steel 3 arranged in the prefabricated high-performance concrete hollow column 1 along the column length direction;

The steel plate 4 arranged on the section steel 3 in the prefabricated high-performance concrete hollow column 1 along the column length direction;

The stirrups 5 laid on the cross section of the prefabricated high-performance concrete hollow column 1 at equal intervals, wherein the longitudinal bars 2 and the section steel 3 are both located in the surrounding of the stirrups 5;

The cast-in-place concrete 6 filled in the central cavity of the prefabricated high-performance concrete hollow column 1;

end plates 7 arranged on the upper and lower ends of the prefabricated high-performance concrete hollow column 1;

as well as,

The high-strength bolts 8 arranged on the end plate 7 are used to connect the adjacent prefabricated high-performance concrete hollow columns 1 .

The section steel 3 is an I-beam, or is formed by two I-beams in a crisscross pattern.

The section steel 3 protrudes from both ends of the prefabricated high-performance concrete hollow column 1 in the column length direction.

The steel plate 4 is arranged on the section steel 3 along the length direction of the column by welding to form an annular honeycomb hollow structure.

The stirrups 5 are welded composite stirrups or continuous spiral high-strength stirrups.

The concrete used in the cast-in-place ordinary concrete 6 is ordinary concrete, recycled concrete, lightweight aggregate concrete, rubber concrete, sound-absorbing concrete or heat-insulating concrete.

The end plate 7 is welded on the protruding section steel 3 and the steel plate 4, and is connected with high-strength bolts 8 by welding.

The present invention also provides a construction method for the partially prefabricated assembled steel-concrete mixed column, the steps are as follows:

1), in the factory, the steel plate 4 is arranged on the section steel 3 along the column length direction by welding to form an annular honeycomb hollow structure; the end plate 7 is welded on the two ends of the annular honeycomb hollow structure formed by the section steel 3 and the steel plate 4; The high-performance concrete hollow column 1 is poured on the outer side of the annular honeycomb hollow structure formed by the steel plate 4 and the section steel 3, and the longitudinal reinforcement 2 and the stirrup 5 are inserted to complete the prefabricated part;

2) On the site, install the prefabricated high-performance concrete hollow column 1 with longitudinal reinforcement 2, section steel 3, steel plate 4, stirrup 5 and end plate 7; the end plate will be set at the lower end of the upper prefabricated high-performance concrete hollow column 1 7 and the end plate 7 arranged on the upper end of the lower prefabricated high-performance concrete hollow column 1, connected by welding and high-strength bolts 8;

3), on the site, pour the cast-in-place ordinary concrete 6 into the honeycomb cavity in the center of the lower prefabricated high-performance concrete hollow column 1 to form a steel-concrete mixed column;

4) In the field, the end plate 7 is directly connected to the composite column or steel column through welding and high-strength bolts 8; the steel beam is connected to the steel beam through the overhanging steel beam and the high-strength bolt.

Compared with the prior art, the beneficial effects of the present invention are:

1) The construction process is simple. Part of the prefabricated steel-concrete hybrid column is prefabricated in the factory, and the steel and the steel plate form an annular honeycomb hollow structure, eliminating the need for the internal formwork step in the process of pouring the high-performance concrete hollow column. On the construction site, firstly, the prefabricated upper and lower columns are connected by welding of end plates and high-strength bolts, and then the inner hollow part of the lower high-performance concrete hollow column is poured to form a steel-concrete mixed column. By welding the end plate of the prefabricated part and the node or steel column through the perforated steel plate welding and high-strength bolt connection, the construction and installation of the steel-concrete mixed column is completed. Compared with the traditional steel concrete column construction and installation, there is no need to bind steel bars, support formwork, remove formwork and erect temporary support under the column on site. After a reasonable design, the construction and installation of the steel-concrete mixed column will be as convenient and fast as the steel column, and the construction performance will be greatly improved.

2) The construction quality is excellent. In the construction of traditional steel reinforced concrete columns, due to the many construction procedures and difficult construction of the steel reinforced concrete columns, there are often quality problems such as poor concrete vibration in the steel reinforced concrete column webs, insufficient concrete strength and dislocation of steel bars in the columns, and the construction quality is not easy to control. In some prefabricated steel-concrete mixed columns, the high-performance concrete hollow columns are factory prefabricated, the concrete is easy to pour and vibrate and can be cured by steam, and the quality of the concrete construction is easy to control, especially when high-performance concrete is used, some prefabricated steel-concrete Hybrid columns have more obvious advantages in construction quality control.

3) The bearing capacity and comprehensive functions are improved. The lower part of the section steel-concrete mixed column is under relatively large force, and ordinary concrete is poured in the column. The annular honeycomb hollow structure formed by section steel and steel plate can produce circumferential restraint force on the concrete in the core area. Circumferential binding force, the internally welded steel plate participates in the load-bearing of the column, and provides lateral binding force for the section steel, thus greatly improving the bearing capacity of the column; the internal section steel and the steel plate are welded to form a ring-shaped honeycomb hollow structure, which eliminates the need for The internal formwork step in the construction process can effectively reduce the self-weight of the structure and improve the overall performance and seismic performance of the structure; in the steel-concrete mixed column, high-performance concrete can be used in the prefabricated part, and ordinary strength concrete can be used in the cast-in-place part. , the two concrete strength grades can be different. Therefore, in practical engineering applications, the choice of floor concrete can not be limited by the strength of the concrete in the column, and various types of concrete with different characteristics can be selected to effectively improve the functional requirements of the structure. For example, for the cast-in-place concrete of the steel-concrete mixed column, recycled concrete can be used to save resources and energy; lightweight aggregate concrete can also be used to reduce the self-weight; rubber concrete or sound-absorbing concrete can be used to improve the effect of vibration reduction and sound insulation; thermal insulation can be used Concrete improves thermal insulation properties.

Generally speaking, some prefabricated steel-concrete hybrid columns, compared with traditional steel-concrete columns, simplifies the construction process and construction difficulty, can effectively solve the key problems that restrict the popularization and application of traditional steel-concrete columns for a long time, and can give full play to and effectively improve traditional steel-concrete columns. Profiled steel concrete columns have significant advantages in mechanical performance, durability, fire resistance and economic performance, and can be widely used in various reinforced concrete and steel structure buildings, especially for super high-rise, long-span structures and heavy-duty industrial buildings. Therefore, it is of practical engineering significance to carry out in-depth research on some prefabricated steel-concrete hybrid columns to promote their popularization and application.

Description of drawings

FIG. 1 is a schematic structural diagram of a partially prefabricated steel-concrete mixed column of the present invention.

Figure 2 is a front elevational view of a partially prefabricated steel-concrete mixed column of the present invention.

Fig. 3 is the cross-sectional schematic diagram of part of the prefabricated steel-concrete mixed column A-A of the present invention

FIG. 4 is a schematic cross-sectional view of part of the prefabricated steel-concrete mixed column B-B of the present invention.

5 is a schematic cross-sectional view of a part of the prefabricated steel-concrete mixed column C-C of the present invention.

Fig. 6 is a schematic cross-sectional view of the open end plate of a partially prefabricated steel-concrete mixed column of the present invention.

FIG. 7 is a schematic diagram of the connection of a part of the prefabricated steel-concrete hybrid column and the steel beam according to the present invention.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.

Part of the prefabricated and assembled steel-concrete mixed column of the present invention adopts the idea of partially prefabricated and assembled part cast-in-place, and consists of a prefabricated part and a cast-in-place part, as shown in Figures 1 to 5, including:

Prefabricated high-performance concrete hollow column 1; longitudinal bars 2 arranged in the prefabricated high-performance concrete hollow column 1 along the column length direction; shaped steel 3 arranged in the prefabricated high-performance concrete hollow column 1 along the column length direction; arranged along the column length direction The steel plate 4 on the profiled steel 3 in the prefabricated high-performance concrete hollow column 1; the stirrups 5 laid on the cross-section of the prefabricated high-performance concrete hollow column 1 at equal intervals, wherein the longitudinal reinforcement 2 and the profiled steel 3 are located in the surrounding of the stirrup 5 Among them; the cast-in-place concrete 6 filled in the central cavity of the prefabricated high-performance concrete hollow column 1; the end plates 7 arranged at both ends of the prefabricated high-performance concrete hollow column 1; . Among them, prefabricated high-performance concrete hollow column 1, longitudinal reinforcement 2, section steel 3, steel plate 4, stirrup 5 and end plate 7 constitute the prefabricated part, and the cast-in-place part is mainly cast-in-place concrete 6.

Among them, the section steel 3 is composed of two I-beams in a crisscross pattern. The section steel 3 extends from both ends of the prefabricated high-performance concrete hollow column 1 in the column length direction. The steel plate 4 is arranged on the section steel 3 along the column length direction by welding. , forming an annular honeycomb hollow structure. The stirrups 5 are welded composite stirrups or continuous spiral high-strength stirrups. The concrete used for the cast-in-place ordinary concrete 6 can be ordinary concrete, recycled concrete, lightweight aggregate concrete, rubber concrete, sound-absorbing concrete or thermal insulation concrete according to different requirements. The end plate 7 is a perforated end plate, which is welded on the protruding section steel 3 and the steel plate 4, and is arranged along the length direction of the column. 1. The end plate 7 at the upper end is connected with high-strength bolts 8 by welding.

The prefabricated high-performance concrete hollow column 1, longitudinal reinforcement 2, section steel 3, steel plate 4, stirrup 5 and end plate 7 of the present invention are prefabricated at one time in a factory to obtain a prefabricated steel concrete hollow column. The prefabricated prefabricated steel-concrete hollow column is transported to the construction site, the upper and lower end plates are connected by welding and high-strength bolts, and the internal concrete is poured to form a steel-concrete mixed column; then spliced with columns, beams, etc. The present invention adopts the idea of partial prefabrication to obtain more overall performance.

The concrete construction method of the present invention is:

1), in the factory, the steel plate 4 is arranged on the section steel 3 along the column length direction by welding to form an annular honeycomb hollow structure; the end plate 7 is welded on the two ends of the annular honeycomb hollow structure formed by the section steel 3 and the steel plate 4; The high-performance concrete hollow column 1 is poured on the outer side of the annular honeycomb hollow structure formed by the steel plate 4 and the section steel 3, and the longitudinal reinforcement 2 and the stirrup 5 are inserted to complete the prefabricated part;

2) On the site, install the prefabricated high-performance concrete hollow column 1 with longitudinal reinforcement 2, section steel 3, steel plate 4, stirrup 5 and end plate 7; the end plate will be set at the lower end of the upper prefabricated high-performance concrete hollow column 1 7 and the end plate 7 arranged on the upper end of the lower prefabricated high-performance concrete hollow column 1, connected by welding and high-strength bolts 8;

3) On the site, pour the cast-in-place ordinary concrete 6 into the honeycomb cavity in the center of the lower prefabricated high-performance concrete hollow column (1) to form a steel-concrete mixed column;

4) In the field, the end plate 7 is directly connected to the composite column or steel column through welding and high-strength bolts 8; the steel beam is connected to the steel beam through the overhanging steel beam and the high-strength bolt.

To sum up, some prefabricated steel-concrete mixed columns of the present invention use high-performance concrete, which has good durability and ductility. At the same time, the prefabricated high-performance concrete hollow columns can generate circumferential constraints on the internal steel, and the internally welded steel plates participate in the stress. At the same time, it provides a lateral restraint force for the profiled steel and internal pouring concrete, thereby greatly improving its bearing capacity.

The inner section steel and the steel plate of the invention are welded to form an annular honeycomb hollow structure, which eliminates the internal formwork support step in the construction process, can effectively reduce the self-weight of the structure, improve the overall performance and seismic performance of the structure, and improve the transportation of components. With the deformation ability during the hoisting process, the difficulty of hoisting is reduced, and the mechanical performance and service performance of prefabricated steel-concrete components are comprehensively enhanced and improved, forming a new type of high-efficiency partially prefabricated steel-concrete mixed column technology. The partially prefabricated steel-concrete hybrid column technology proposed by the present invention has many significant performance advantages, such as convenient construction, wide applicability, light structure weight, high bearing capacity, good seismic performance, etc., and can be widely used in buildings, workshops, bridge columns and other Reinforced concrete engineering structures have broad application prospects, important engineering practical significance and social and economic benefits.

Claims (7)

1. The utility model provides a prefabricated assembly shaped steel concrete hybrid column in part, its characterized in that includes:

prefabricating a high-performance concrete hollow column (1);

longitudinal bars (2) arranged in the prefabricated high-performance concrete hollow column (1) along the column length direction;

the section steel (3) is arranged in the prefabricated high-performance concrete hollow column (1) along the column length direction;

a steel plate (4) arranged on the section steel (3) in the prefabricated high-performance concrete hollow column (1) along the column length direction;

the stirrups (5) are laid on the cross section of the prefabricated high-performance concrete hollow column (1) at equal intervals, and the longitudinal reinforcements (2) and the section steel (3) are both surrounded by the stirrups (5);

the cast-in-place concrete (6) is filled in a central cavity in the prefabricated high-performance concrete hollow column (1);

end plates (7) arranged at the upper end and the lower end of the prefabricated high-performance concrete hollow column (1);

and the number of the first and second groups,

the high-strength bolt (8) is arranged on the end plate (7) and used for connecting the adjacent prefabricated high-performance concrete hollow columns (1);

the steel plates (4) are arranged on the section steel (3) along the column length direction in a welding mode to form an annular honeycomb hollow structure;

the end plates (7) are welded on the extended section steel (3) and the steel plates (4) and are connected with the high-strength bolts (8) through welding.

2. The partially prefabricated assembled steel reinforced concrete hybrid column according to claim 1, wherein said section steel (3) is an i-steel.

3. The partially prefabricated assembled steel reinforced concrete mixing column according to claim 1, wherein said section steel (3) is composed of two i-beams crisscrossed.

4. The partially prefabricated assembled steel reinforced concrete hybrid column according to claim 1, 2 or 3, wherein the section steel (3) is protruded from both ends of the prefabricated high performance concrete hollow column (1) in the column length direction.

5. The partially prefabricated assembly type steel concrete mixing column according to claim 1, wherein the stirrup (5) is a welded composite stirrup or a continuous spiral high-strength stirrup.

6. The partially prefabricated assembly type steel concrete mixing column according to claim 1, wherein the concrete adopted by the cast-in-place concrete (6) is ordinary concrete, recycled concrete, lightweight aggregate concrete, rubber concrete, sound absorption concrete or thermal insulation concrete.

7. The construction method of the partially prefabricated assembled steel reinforced concrete mixing column according to claim 1, characterized by comprising the following steps:

1) in a factory, arranging steel plates (4) on the section steel (3) along the column length direction in a welding mode to form an annular honeycomb hollow structure; welding end plates (7) at two ends of an annular honeycomb hollow structure formed by the section steel (3) and the steel plates (4); pouring a high-performance concrete hollow column (1) on the outer side of an annular honeycomb hollow structure formed by the steel plate (4) and the section steel (3) through a formwork, and arranging longitudinal bars (2) and stirrups (5) to finish a prefabricated part;

2) the method comprises the following steps of installing a prefabricated high-performance concrete hollow column (1) with longitudinal ribs (2), section steel (3), steel plates (4), stirrups (5) and end plates (7) on site; connecting an end plate (7) arranged at the lower end of the upper prefabricated high-performance concrete hollow column (1) with an end plate (7) arranged at the upper end of the lower prefabricated high-performance concrete hollow column (1) through welding and a high-strength bolt (8);

3) pouring cast-in-place concrete (6) into a honeycomb cavity in the center of a prefabricated high-performance concrete hollow column (1) at the lower part on site to form a steel concrete mixed column;

4) in the field, the end plate (7) is directly connected with the combined column or the steel column through welding and a high-strength bolt (8); the steel beam is connected with the high-strength bolt through the overhanging steel beam.

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