CN104405082A - Steel rib-steel pipe regenerated-concrete combined column with cross-shaped section - Google Patents

Abstract

The invention relates to a steel frame-steel pipe recycled concrete cross-section composite column, which is composed of steel frame, steel pipe, steel bar skeleton and concrete, the steel frame is welded by steel plates, and the steel frame is located at the limb of the cross-shaped column surrounded by stirrups. Above, the steel pipe is located at the core of the cross-shaped column, the concrete is recycled concrete, and the recycled concrete is located inside and outside the steel pipe and inside the cross-shaped column surrounded by stirrups. The steel frame is welded into a T shape by steel plates. The corners of the cross-shaped column surrounded by stirrups are equipped with longitudinal reinforcement. Recycled concrete is located inside and outside the steel pipes, which saves resources and protects the environment; the steel skeleton acts as a constraint on the concrete and enhances the bearing capacity of the columns. The invention is the main component of the frame structure in high-rise and long-span buildings, which has high bearing capacity, high rigidity, light weight, good plasticity and toughness, good impact resistance and fatigue resistance, good earthquake resistance, and good durability. Features such as energy saving and environmental protection.

Description

Steel Reinforced Steel Tube Recycled Concrete Cross Section Composite Column

technical field

The invention relates to a concrete component, in particular to a concrete cross-shaped column used in civil engineering, which is a novel cross-section composite column.

Background technique

In the current society, with the development of the economy and the improvement of residents' living standards, people have higher and higher requirements for housing, especially for housing structure and living room layout. Because the cross-sectional size of ordinary concrete columns is often larger than the thickness of the wall, it affects the use of indoor space, and it is difficult to meet the requirements of architectural beauty. In order to solve this problem, the structural form of reinforced concrete cross-shaped column appeared. The advantages of the reinforced concrete cross-shaped column structure system are more prominent, and scholars and experts at home and abroad have conducted extensive and in-depth research on it. The theoretical system of reinforced concrete cross-shaped columns has been basically formed. For example, Tianjin, Shenyang, Guangdong, Shanxi and other provinces and cities have completed the compilation of local regulations and guided them in engineering practice. The construction area reaches tens of millions of square meters.

However, with the continuous development of super high-rise and long-span building structures, the disadvantages of pure reinforced concrete cross-shaped columns are becoming more and more prominent. If limited by the axial compression ratio, if ordinary reinforced concrete cross-shaped columns are still used under heavy loads, the section size of the columns will be very large; the leg length of the cross-shaped columns should not be too long, otherwise it will easily produce Shear lag phenomenon, so the leg length and leg width of the cross-shaped column are usually limited within a certain range of proportions; the cross-shaped column has changed its mechanical properties due to the change of the cross-sectional form, compared with the ordinary rectangular column , the bearing capacity and ductility have decreased, and the seismic performance is not ideal.

At the same time, under the current situation, there are 13.6 million tons of waste concrete in the construction waste demolished from old buildings every year in the country, plus the waste concrete produced by the 40 million tons of construction waste generated by new houses every year. Costs and the resulting environmental concerns are also prominent. In order to minimize the exploitation of natural resources, it is necessary to maximize the recycling of construction waste. Therefore, the research and application promotion of construction waste treatment and application technology is imperative. However, at present, due to the inherent damage of recycled aggregate and the high water absorption rate caused by the adsorption of a layer of old mortar on its surface, the strength, shrinkage and durability of recycled concrete are poorer than ordinary concrete. The earth limits its scope of use.

Therefore, under the above background, in order to promote the utilization of recycled concrete, this paper proposes a new type of steel frame-steel tube recycled concrete cross-section composite column by analyzing the previous research results. The advantages of concrete-filled steel pipe columns, steel-reinforced concrete columns, and recycled concrete columns reduce resource pressure and environmental burden, and greatly broaden the application and development space of concrete cross-shaped columns, which has very important research significance.

Contents of the invention

The purpose of the present invention is to provide a steel frame-steel tube recycled concrete cross-section composite column. This new type of composite column not only improves the mechanical performance of ordinary reinforced concrete cross-shaped columns, but also makes full use of waste concrete, so as to achieve waste recycling. Effective use saves resources and protects the environment. The present invention is realized through the following technical solutions: the T-shaped steel frame of the steel frame-steel tube recycled concrete cross-section composite column is welded by steel plates, located on the limbs of the cross-shaped column, and the steel tube is located at the center of the column. The steel frame and steel pipe are fixed by welding or bolting, and then the steel frame is bound, the formwork is set up, and recycled concrete is poured. It is characterized in that: the steel frame on the cross-shaped column improves the mechanical performance of the limb; the steel pipe at the core improves the bearing capacity and ductility of the cross-shaped column; fully utilizes the waste construction waste to form recycled concrete, and achieves Waste utilization, energy saving, green environmental protection.

Advantage and effect of the present invention are:

1. Make full use of abandoned construction waste to form recycled concrete, realize waste utilization, save energy, and be green and environmentally friendly;

2. The steel pipe is located inside the intersection of concrete in the vertical and horizontal directions, protected by the external concrete, and has good fire resistance and corrosion resistance;

3. The concrete in the steel pipe is in a three-phase compression state, which improves the ultimate bearing capacity of the column and provides space for the application of high-strength concrete;

4. The steel frame is located at the limb of the cross-shaped column, which improves the mechanical performance of the limb;

5. The steel frame and steel pipe can be constructed first, and the steel frame and steel pipe can be welded or bolted at the bottom, and then the longitudinal bars and stirrups can be tied to form a skeleton and pour recycled concrete to form a laminated column;

7. Due to the presence of steel frames and steel pipes, the ductility of the column is improved, and the ultimate bearing capacity of the column is increased, which is beneficial to the seismic design of the earthquake zone;

8. Broaden the application and development space of concrete cross-shaped columns, and beautify the appearance of the building.

Description of drawings

Figure 1 is a schematic diagram of a steel frame-steel tube recycled concrete cross-section composite column.

Among the figure: 1 is longitudinal reinforcement, 2 is recycled concrete, 3 is steel pipe, 4 is stirrup, 5 is steel frame.

Detailed ways

Steel frame-steel tube recycled concrete cross-section composite column is composed of steel frame, steel tube, steel frame and concrete. Steel frame 5 is welded by steel plate. The steel pipe 3 is located at the core of the cross-shaped column, the concrete 2 is recycled concrete, and the recycled concrete 2 is located inside and outside the steel pipe 3 and inside the cross-shaped column surrounded by hoops and 4 bars. The steel frame is welded into a T shape by steel plates. The corners of the cross-shaped column surrounded by the stirrups 4 are equipped with longitudinal steel bars 1 .

The specific process is as follows:

1. Weld steel plates into steel frames according to regulations;

2. Fix the steel frame and steel pipe by welding or bolting, and keep it vertical or at a certain angle;

3. Binding steel skeleton;

4. Support formwork on the outer side of the steel skeleton;

5. Fully mix a certain proportion and a certain size of recycled concrete fragments with cement to form recycled concrete;

6. Pouring recycled concrete;

7. Regular maintenance;

8. After the specified maintenance date is reached, the mold is demolished.

Claims (3)

1. steel frame-steel pipe regeneration concrete star section coupled column, be made up of reinforcing bar, steel pipe, cage of reinforcement and concrete, it is characterized in that: reinforcing bar (5) is formed by Plate Welding, reinforcing bar (5) is positioned on the limb of the cross section column that stirrup (4) surrounds, steel pipe (3) is positioned at the core of cross section column, concrete is regeneration concrete, the cross section column that inside and outside, stirrup (4) that regeneration concrete (2) is positioned at steel pipe (3) surround.

2. the steel frame-steel pipe regeneration concrete star section coupled column according to right 1, is characterized in that: reinforcing bar (5) becomes T-shaped by Plate Welding.

3. the steel frame-steel pipe regeneration concrete star section coupled column according to right 1, is characterized in that: longitudinal reinforcement (1) is equipped with at the angle of the cross section column that stirrup (4) surrounds.