CN104652705B - Prefabricated and assembly type steel reinforced concrete column with high-performance concrete frame and construction method - Google Patents

Abstract

The invention discloses a prefabricated and assembly type steel reinforced concrete column with a high-performance concrete frame. The prefabricated and assembly type steel reinforced concrete column adopts an idea of partial prefabricated assembly and partial casting in situ and comprises a prefabricated part and a cast-in-situ part. The prefabricated assembly type steel reinforced concrete column comprises a prefabricated high-performance concrete hollow column, longitudinal bars, section steel, stirrups and cast-in-situ common concrete, wherein the longitudinal bars are arranged in the prefabricated high-performance concrete hollow column along the column-length direction; the section steel is arranged in the prefabricated high-performance concrete hollow column along the column-length direction; the stirrups are spread on the cross section of the prefabricated high-performance concrete hollow column at equal intervals; the longitudinal bars and the section steel are enclosed by the stirrups; a central cavity of the prefabricated high-performance concrete hollow column is filled with the cast-in-situ common concrete. The invention also provides a construction method. The prefabricated and assembly type steel reinforced concrete column with a high-performance concrete frame and the construction method disclosed by the invention have the advantages that the hollow prefabricated high-performance concrete column can generate circumferential constraining force for the cast-in-situ common concrete, so that the bearing capability is improved, the whole performance and the seismic resistance of the structure are improved, the deformation capability of a member in the process of transportation and lifting is improved, and the comprehensive improvement and enhancement of the stressing performance and the use performance of the prefabricated steel reinforced concrete member are realized.

Description

A prefabricated steel concrete column with a high performance concrete frame and its construction method

technical field

The invention belongs to the technical field of buildings, in particular to a prefabricated steel concrete column with a high-performance concrete frame and a construction method.

Background technique

Steel Reinforced Concrete Structure (often translated as Steel Reinforced Concrete Structure, referred to as SRC structure) refers to the form of steel-concrete composite structure formed by disposing steel in the cross section of reinforced concrete members. Compared with the reinforced concrete structure, due to the configuration of steel inside the reinforced concrete section, the steel concrete structure has significant advantages such as high strength, high rigidity, good seismic performance, and small section size. Compared with the steel structure, because the steel is wrapped with reinforced concrete, the steel concrete structure has the outstanding advantages of low cost, high rigidity, good fire resistance and durability. Therefore, from the comprehensive analysis and comparison of economic cost, mechanical performance, durability and fire resistance, the steel concrete structure has the advantages of both reinforced concrete structure and steel structure, and has significant performance advantages.

At present, the steel concrete structure is mainly used in some large super high-rise buildings and long-span buildings, such as Shanghai Jinmao Tower, Shanghai World Financial Center, CCTV new station site, China World Trade Center Phase III main building and other projects. Some large super high-rise buildings and long-span buildings, such as Shanghai Jinmao Tower, Shanghai World Financial Center, CCTV new station site, and the main building of China World Trade Center Phase III, all use steel-concrete structures. Steel-concrete structures are seldom used in buildings. One of the most important reasons is that the on-site construction procedures of steel-concrete structures are numerous and the structural connections are complicated. It is precisely because of the outstanding disadvantage of complex construction of steel concrete structures that the popularization and application of steel concrete structures is greatly restricted, resulting in the failure of full play to the excellent comprehensive performance of steel concrete structures.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a prefabricated assembled steel concrete column with a high performance concrete frame and a construction method, adopting the idea of partially prefabricated and partially cast-in-place, first prefabricating the outside of the PSRC column in the factory The frame part, and then install the external frame part of the PSRC column on the construction site, and finally pour the inner hollow part of the PSRC column together with the beam and slab, which is suitable for different engineering conditions and has the characteristics of simple construction, low cost and excellent performance.

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

A prefabricated steel concrete column with high performance concrete frame, comprising:

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;

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

The stirrups 4 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 located in the surround of the stirrups 4;

as well as,

The cast-in-place concrete 5 filled in the central cavity of the prefabricated high-performance concrete hollow column 1 .

The section steel 3 is an I-beam.

The section steel 3 is composed of two I-beams interlaced in a cross shape.

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

The stirrups 4 are welded composite stirrups or continuous spiral high-strength stirrups.

The concrete used in the cast-in-place concrete 5 is ordinary concrete, recycled concrete, lightweight aggregate concrete, rubber concrete, sound-absorbing concrete or thermal insulation concrete.

The present invention also provides a construction method for the prefabricated steel concrete column with a high-performance concrete frame, characterized in that the steps are as follows:

1) In the factory, pour the prefabricated high-performance concrete hollow column 1 in the concrete rubber mandrel, and insert longitudinal reinforcement 2, section steel 3 and stirrup 4 to complete the prefabricated part;

2), on site, install a prefabricated high-performance concrete hollow column 1 with longitudinal reinforcement 2, section steel 3 and stirrup 4;

3) Pour in-situ concrete 5 into the central cavity of the prefabricated high-performance concrete hollow column 1, and simultaneously pour beams and slabs.

Compared with prior art, the beneficial effect of the present invention is:

1) Easy construction.

The prefabricated section steel skeleton part of the PSRC column includes column longitudinal reinforcement, column stirrup, section steel flange and surrounding concrete. This part is prefabricated in the factory, and the prefabricated section steel is directly connected to the node or steel column at the construction site (or transition connection with the concrete column), and then pour the hollow part inside the concrete to complete the construction and installation of the PSRC column. Compared with the construction and installation of traditional SRC columns, there is no need to bind steel bars, set up formwork, remove formwork and erect temporary supports under the columns on site. After rational design, the construction and installation of PSRC columns will be as convenient and fast as steel columns, and the construction performance will be greatly improved.

2) Function improvement.

As mentioned above, in the PSRC column, high-performance concrete can be used in the prefabricated part, and ordinary-strength concrete can be used in the cast-in-place part, and the strength grades of the two concretes can be different. Therefore, in practical engineering applications, the choice of floor concrete can be independent of 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 PSRC column, in order to save resources and energy, recycled concrete can be used; in order to reduce the self-weight, lightweight aggregate concrete can be used; in order to improve the effect of vibration reduction and sound insulation, rubber concrete or sound-absorbing concrete can be used; Performance, thermal insulation concrete can be used.

3) The construction quality is good.

In the construction of traditional SRC columns, due to the many construction procedures and high construction difficulties of SRC columns, quality problems such as poor concrete vibration in the SRC column web, insufficient concrete strength, and dislocation of steel bars in the column often occur, and the construction quality is difficult to control. In the PSRC column, the frame part of the PSRC column is prefabricated in the factory, the concrete is poured and vibrated conveniently, and steam curing can be used, and the concrete construction quality is easy to control, especially when high-performance concrete is used, the PSRC column has more obvious advantages in construction quality control .

Generally speaking, compared with traditional SRC columns, PSRC columns using prefabricated assembly technology simplifies the construction process and construction difficulty, can effectively solve the key problems that have long restricted the popularization and application of traditional SRC columns, and can give full play to and effectively improve the traditional SRC columns. It has significant advantages in mechanical performance, durability, fire resistance and economic performance, and can be widely used in various reinforced concrete and steel structures, especially for long-span, heavy-load or complex, irregular high-rise buildings and buildings. Super high-rise buildings. Therefore, it is of great engineering practical significance to carry out in-depth research on PSRC columns to promote their popularization and application.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a prefabricated steel concrete column of the present invention.

Fig. 2 is a structural schematic diagram of the prefabricated part of the prefabricated steel concrete column of the present invention.

Fig. 3 is a top view of the prefabricated part of the prefabricated steel concrete column of the present invention.

Fig. 4 is a schematic structural view of the prefabricated steel concrete column of the present invention.

Fig. 5 is a top view of the prefabricated steel concrete column of the present invention.

Fig. 6 is a schematic diagram of the installation of prefabricated steel concrete columns and beams of the present invention.

detailed description

The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

The present invention is a prefabricated assembled steel concrete column with a frame of high-performance concrete, which adopts the idea of partially prefabricated assembly and part cast-in-place, and is composed 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 reinforcement 2 arranged in the precast high-performance concrete hollow column 1 along the column length direction; section steel 3 arranged in the precast high-performance concrete hollow column 1 along the column length direction; laying equidistantly in the precast high-performance concrete hollow The stirrups 4 on the cross section of the column 1, wherein the longitudinal bars 2 and the section steel 3 are located in the surround of the stirrups 4; and, the cast-in-place concrete 5 filled in the central cavity of the prefabricated high-performance concrete hollow column 1 . Among them, the prefabricated high-performance concrete hollow column 1, longitudinal reinforcement 2, section steel 3 and stirrup 4 form the prefabricated part, while the cast-in-place part is mainly cast-in-place concrete 5 .

Wherein, as shown in Fig. 2 and Fig. 3, the section steel 3 is composed of two I-beams in a criss-cross pattern. It is welded composite stirrup or continuous spiral high-strength stirrup. As shown in Fig. 4 and Fig. 5, the cast-in-place concrete 5 constitutes the cast-in-place part. The concrete used in the cast-in-place concrete 5 can be ordinary concrete, recycled concrete, lightweight aggregate concrete, rubber concrete, sound-absorbing concrete or thermal insulation concrete according to different needs.

in:

1) The prefabricated part adopts high-performance concrete, which can improve the crack resistance, durability and fire resistance of prefabricated steel concrete columns.

2) In the prefabricated steel skeleton part, a small section of section steel is used to connect with the extended section steel of the pre-embedded column with high-strength bolts during construction and installation, which can facilitate the connection of the prefabricated steel concrete column and the column. It can also be connected with the beam 6 by bolts, as shown in FIG. 6 .

3) In order to facilitate the fabrication of the hollow part of the prefabricated high-performance concrete hollow column 1, the concrete rubber mandrel can be used repeatedly.

Concrete construction method of the present invention is:

1) In the factory, pour the prefabricated high-performance concrete hollow column 1 in the concrete rubber mandrel, and insert longitudinal reinforcement 2, section steel 3 and stirrup 4 to complete the prefabricated part;

2), on site, install the prefabricated high-performance concrete hollow column 1 with longitudinal reinforcement 2, section steel 3 and stirrup 4.

3) Pour in-situ concrete 5 into the central cavity of the prefabricated high-performance concrete hollow column 1, and simultaneously pour beams and slabs.

To sum up, the present invention guarantees its good integrity by prefabricating a section steel frame with a high-performance concrete frame, and pouring concrete together with beams and floor slabs after being installed on site. Among them, the prefabricated high-performance concrete steel box frame has an effective circumferential constraint force on the secondary poured concrete, which improves its bearing capacity. At the same time, the high-performance concrete has good durability and ductility. A certain degree of protection against lateral damage.

The invention effectively improves the structural integrity of beams and columns, improves the anti-seismic performance of the structure, and at the same time greatly improves the deformation capacity of components during transportation and hoisting, and realizes the comprehensive improvement of the mechanical performance and service performance of prefabricated steel concrete components Enhanced to form a new type of high-efficiency prefabricated steel concrete column technology. The prefabricated steel concrete column technology proposed by the present invention has many significant performance advantages such as convenient construction, wide applicability, and high overall performance, and can be widely used in various reinforced concrete engineering structures such as buildings, factory buildings, and bridge columns, and has wide application prospects. engineering practical significance and social and economic benefits.

Based on the traditional prefabricated column, the present invention adopts the hollow steel high-performance concrete column for the prefabricated part, which effectively improves the integrity of the prefabricated part, greatly reduces the self-weight of the prefabricated part, and meets the requirements for on-site hoisting. It is a good prefabricated method. According to the design method proposed by the inventor, the thickness of the high-performance concrete frame, the type of steel, the texture of the inner surface of the precast concrete, the strength of the precast concrete and other parameters, the strength and type of cast-in-place concrete (recycled concrete, lightweight aggregate concrete, etc.) can be further optimized. In order to realize the optimal design of this example.

Claims (3)

1. a kind of prefabrication and assembly construction profile steel concrete column with high performance concrete frame, it is characterised in that include：

Prefabricated high performance concrete open tubular column (1)；

The prefabricated vertical muscle (2) being arranged at along column length direction in prefabricated high performance concrete open tubular column (1)；

The prefabricated shaped steel (3) being arranged at along column length direction in prefabricated high performance concrete open tubular column (1), shaped steel (3) by Two I-steel are staggeredly constituted in cross；

The prefabricated stirrup (4) being equidistantly layed on prefabricated high performance concrete open tubular column (1) cross section, wherein indulges muscle (2) Among the encirclement of stirrup (4) is respectively positioned on shaped steel (3)；

And,

The cast-in-place concrete (5) being filled in the center cavity of prefabricated high performance concrete open tubular column (1)；

Wherein, shaped steel (3) on column length direction are stretched out the two ends of prefabricated high performance concrete open tubular column (1), and are being stretched out Part is connected with beam (6), and the concrete adopted by cast-in-place concrete (5) is for normal concrete, regeneration concrete, lightweight aggregate Concrete, rubber concrete, sound absorption concrete or thermal-insulating concrete.

2. the prefabrication and assembly construction profile steel concrete column with high performance concrete frame according to claim 1, it is characterised in that institute Stirrup (4) is stated for welding compound stirrup or continuous helical high-strength stirrup.

3. the construction method of the prefabrication and assembly construction profile steel concrete column with high performance concrete frame according to claim 1, its It is characterised by, step is as follows：

1), in factory, pour prefabricated high performance concrete open tubular column (1) in concrete rubber core, be placed into vertical muscle (2), Shaped steel (3) and stirrup (4), complete pre-erection；

2) prefabricated high performance concrete open tubular column (1) with vertical muscle (2), shaped steel (3) and stirrup (4), at the scene, is installed；

3), cast-in-place concrete (5) is poured to the center cavity of prefabricated high performance concrete open tubular column (1), and while whole pour beam, plate Part.