CN104060762A - L-shaped steel pipe-steel framework recycled concrete combined pillar - Google Patents

Abstract

The invention relates to a concrete member, in particular to an L-shaped composite column used in civil engineering. The L-shaped steel pipe-steel reinforced recycled concrete composite column is composed of steel reinforced steel, steel pipe and recycled concrete. The steel frame is located in the center of the L-shaped column, which is conducive to improving the mechanical performance of the L-shaped column limbs; the L-shaped steel tube is located outside, and the concrete inside the steel tube is in a three-dimensional compression state, which restricts the deformation of the concrete and promotes the brittle high-strength concrete The application in L-shaped columns; recycled concrete can effectively improve the corrosion resistance of the columns, and save resources and protect the environment. 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

L-shaped steel pipe-steel reinforced recycled concrete composite column

technical field

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

Background technique

In the current society, with the development of super high-rise and long-span buildings, ordinary reinforced concrete columns are no longer suitable for heavy-duty columns under large loads. In this case, there are circular steel pipe-steel reinforced concrete composite columns and square steel pipe-steel reinforced concrete composite columns. However, due to people's higher and higher requirements for the building environment, especially the increasing emphasis on the structure of the house and the layout of the living room, the section size of the ordinary steel pipe-steel reinforced concrete heavy-duty column is often larger than the thickness of the wall, which affects the indoor space. It is difficult to meet the requirements of architectural beauty. In order to solve this problem, the structural form of L-shaped steel pipe concrete column appeared again later.

The advantages of the L-shaped concrete-filled steel tube column structure system are more prominent, and scholars and experts at home and abroad have begun to study it. The L-shaped concrete-filled steel tube column, due to the existence of the outer steel tube, constrains the deformation of the concrete to some extent, provides space for the application of brittle high-strength concrete, and the construction process is simple, without the need for binding steel skeletons and support formwork. However, the L-shaped concrete-filled steel pipe column does not significantly improve the bearing capacity of the column. When the building structure has a high demand for bearing capacity, the section size will be increased, which will also make the indoor edges and corners protrude. For the L-shaped column, too much Long columns are prone to shear hysteresis.

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 aggregates 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-mentioned background, the present invention proposes a novel L-shaped steel pipe-steel reinforced concrete composite column, which combines the advantages of the L-shaped steel pipe concrete column, steel reinforced concrete column, and recycled concrete column to reduce It reduces resource pressure and environmental burden, greatly broadens the application and development space of concrete L-shaped cross-section columns, and has very important research significance.

Contents of the invention

The purpose of the present invention is to provide an L-shaped steel pipe-steel reinforced recycled concrete composite column. This new type of composite column not only improves the mechanical performance of ordinary L-shaped steel pipe concrete columns, but also makes full use of waste concrete, so that the waste can be effectively recycled. Utilization saves resources and protects the environment.

The present invention is realized through the following technical solutions: the steel frame is welded by steel plates, the recycled concrete is located inside the steel pipe, and the concrete wraps the steel frame. The center of the L-shaped steel pipe is coaxial with the L-shaped steel pipe, and the inner steel frame and steel pipe are fixed together with the bottom plate by welding or bolting. The center of the L-shaped column refers to the center of the upper rectangular part, the steel frame (2) is arranged in a T shape, and the bottom ends of the two steel frame vertical columns are fixed together. The shape and arrangement of the steel frames in the present invention are obtained through trial and error.

The inner steel frame located inside the L-shaped column improves the mechanical performance of the limbs, improves the bearing capacity and ductility of the L-shaped column; makes full use of waste construction waste to form recycled concrete, realizes waste utilization, saves energy, and is environmentally friendly; Due to the existence of the inner steel frame, its seismic performance is significantly improved compared with ordinary L-shaped CFST.

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 frame is located inside the L-shaped concrete-filled steel tube column, 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 restricts the deformation of the concrete and provides space for the application of brittle high-strength concrete;

4. The existence of the steel frame improves the mechanical performance of the limbs and the bearing capacity of the composite column;

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;

6. 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;

7. The application and development space of the L-shaped column is widened, and the appearance of the building is beautified.

Description of drawings

Fig. 1 is a schematic diagram of an L-shaped steel pipe-steel reinforced recycled concrete composite column.

In the figure: 1 is a steel pipe, 2 is a steel frame, and 3 is recycled concrete.

Detailed ways

The present invention can be realized in general concrete member factory with reference to accompanying drawing and description. The steel frame is welded by steel plate, the recycled concrete is located inside the steel pipe, and the concrete wraps the steel frame. The shaft, inner steel frame and steel pipe are fixed together with the bottom plate by welding or bolting. The center of the L-shaped column refers to the center of the rectangular part on the limb, the steel frame is arranged in a T shape, and the bottom ends of the two steel frame vertical columns are fixed together.

The specific process is as follows:

1. Weld the steel plate into a steel frame according to the regulations;

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

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

4. Pouring recycled concrete;

5. Regular maintenance;

6. After the specified maintenance date is reached, the mold is removed and formed.

Claims (3)

1. The L-shaped steel pipe-steel reinforced recycled concrete composite column is composed of steel skeleton, steel pipe and recycled concrete. The steel skeleton (2) is welded by steel plates. The recycled concrete is located inside the steel pipe, and the concrete wraps the steel skeleton. It is characterized in that: The steel pipe (1) is L-shaped around the concrete, the steel frame (2) is welded into an L-shape, the steel frame (2) is located in the center of the L-shaped steel pipe, and is coaxial with the L-shaped steel pipe, and the inner steel frame and steel pipe are connected by welding or bolts fixed with the bottom plate. 2. The L-shaped steel tube-steel frame recycled concrete composite column according to claim 1, characterized in that: the center of the L-shaped column refers to the center of the rectangular part on the limb, the steel frame (2) is arranged in a T shape, and two The bottom ends of the vertical columns of the steel frame (2) are fixed together. 3. The L-shaped steel pipe-steel reinforced recycled concrete composite column according to claim 1, characterized in that the concrete is recycled concrete.