CN103541501A - Special-shaped section steel rib recycled concrete column - Google Patents

Abstract

The invention relates to a concrete component, in particular to a special-shaped steel-reinforced concrete core column used in civil engineering. The section form of special-shaped cross-section column is T, L, cross-shaped, and the steel frame is welded by steel plate. recycled concrete fragments; the recycled concrete includes recycled concrete fragments of 5mm to 30mm as coarse aggregate in gangue concrete; according to the volume of recycled concrete per cubic meter, the weight of recycled concrete with coarse aggregate is 200kg to 1400kg, 400kg-600kg of cement, 150kg-300kg of water, and 150kg-1500kg of fine sand are fully mixed. The column is constructed of steel skeleton, steel bars and recycled concrete. The invention is a main component of a building frame structure in a high-rise building, and has the characteristics of high bearing capacity, high rigidity, light weight, good plasticity and toughness, good impact resistance and fatigue resistance, good earthquake resistance and the like.

Description

Special-shaped cross-section steel reinforced recycled concrete column

technical field

The invention relates to a concrete component, in particular to a steel-reinforced concrete core column of recycled concrete with special-shaped section used in civil engineering, and is a new type of steel-reinforced concrete composite column.

Background technique

At present, the frame column as the main component of the frame structure is generally an ordinary reinforced concrete column. However, because the cross-sectional size of the frame column is often greater than the thickness of the wall, the phenomenon that the column part protrudes from the wall will appear indoors during use, thereby affecting the indoor space and use.

In order to solve this problem, the structural form of reinforced concrete special-shaped columns appeared. For reinforced concrete special-shaped column structures, there are mainly T, L, and cross shapes. Scholars at home and abroad have carried out extensive and in-depth research. Its theory has been basically formed. Tianjin, Shenyang, Guangdong, Shanxi and other provinces and cities have completed the compilation of local regulations and guided them in engineering practice, with a construction area of tens of millions of square meters.

However, it is also found in the research that the ductility of reinforced concrete special-shaped columns is worse than that of ordinary rectangular columns. Due to the existence of multiple limbs, the shear center and section centroid of special-shaped columns often do not coincide. Under the stress state, each limb produces warping normal stress and shear stress. Due to the shear stress, the concrete of the column base cracks before the ordinary rectangular column, that is, the abdominal shear crack occurs, which leads to the obvious brittleness of the special-shaped column, and the deformation capacity of the special-shaped column is lower than that of the ordinary rectangular column.

In order to solve this problem, many experts have put forward many suggestions and programs. For example, I have applied for patents: steel-reinforced concrete special-shaped column, special-shaped carbon fiber reinforced plastic steel-reinforced concrete core column, a steel-reinforced high-strength concrete column, etc. Although these technologies can solve this problem to a certain extent, they are not perfect, especially the materials used for concrete, which are not conducive to environmental protection and energy saving.

Under the current situation, there are 13.6 million tons of waste concrete in the construction waste removed 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, the huge processing costs and the The environmental problems caused by this are also very 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. In order to promote the utilization of recycled concrete, by analyzing the previous research results, a recycled concrete core column with special-shaped cross-section steel reinforcement was invented, which can not only solve the shortage of reinforced concrete special-shaped columns, but also use construction waste to directly or indirectly recycle waste concrete. It is a good way to use it again.

Contents of the invention

The purpose of the present invention is achieved through the following technical solutions: composed of steel frame, steel bar and recycled concrete, special-shaped cross-section steel frame recycled concrete column, the cross-sectional form of the special-shaped cross-section column is T, L, cross-shaped, and the steel frame is welded by steel plates. It is characterized in that: the special-shaped cross-section steel-reinforced recycled concrete column is composed of steel bone, steel bar and recycled concrete, and the concrete contains recycled concrete fragments acting as aggregate; blocks, as coarse aggregate in gangue concrete; according to the volume of recycled concrete per cubic meter, the weight of recycled concrete with coarse aggregate is 200kg-1400kg, cement is 400kg-600kg, water is 150kg-300kg, and fine sand is 150kg-1500kg The ratio is fully mixed; the steel frame of the special-shaped cross-section column of steel frame recycled concrete is wrapped by reinforced recycled concrete.

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 intersection of concrete in the vertical and horizontal directions, which can resist fire and corrosion;

3. The steel frame can be constructed first, and then the recycled concrete can be poured after forming the skeleton to form a composite column;

4. Due to the existence of steel reinforcement, the ductility of the column is improved, and the bearing capacity of the column is increased, which is beneficial to the seismic design in the earthquake zone.

Description of drawings

Fig. 1 is a schematic diagram of a special-shaped cross-section steel-reinforced recycled concrete core column with a "ten"-shaped structure.

Fig. 2 is a schematic diagram of a special-shaped cross-section steel-reinforced recycled concrete core column with an "L"-shaped structure.

Fig. 3 is a schematic diagram of a special-shaped cross-section steel-reinforced recycled concrete core column with a "T"-shaped structure.

In the figure, 1 is steel frame, and 2 is reinforced concrete.

Detailed ways

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

2. Stand up the steel frame and keep it vertical or at a certain angle;

3. Binding steel skeleton;

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

5. Make recycled concrete fragments with a particle size of 5mm to 30mm as coarse aggregate in recycled concrete;

6. According to the volume of recycled concrete per cubic meter, the recycled weight of coarse aggregate is 200kg-1400kg, cement is 400kg-600kg, water is 150kg-300kg, and fine sand is 150kg-1500kg.

7. Support formwork on the outside of the column and pour recycled concrete.

Claims (4)

1. odd-shaped cross section reinforcing bar regeneration concrete post, the section form of odd-shaped cross section post is T, L, cross, reinforcing bar is formed by Plate Welding, it is characterized in that: by reinforcing bar, reinforcing bar and regeneration concrete, form odd-shaped cross section reinforcing bar regeneration concrete post, in its concrete, contain the regeneration concrete fragment that serves as aggregate.

2. according to the odd-shaped cross section reinforcing bar regeneration concrete post described in right 1, it is characterized in that: described regeneration concrete is included in the regeneration concrete fragment of 5mm～30mm, as the coarse aggregate in coal gangue concrete.

3. according to the odd-shaped cross section reinforcing bar regeneration concrete post described in right 1, it is characterized in that: according to every cubic metre of regeneration concrete volume, coarse aggregate regeneration concrete weight 200kg～1400kg, cement 400 kg～600 kg, water 150 kg～300 kg, the ratio of fine sand 150kg～1500kg fully stirs.

4. according to the odd-shaped cross section reinforcing bar regeneration concrete post described in right 1, it is characterized in that: the reinforcing bar of reinforcing bar regeneration concrete odd-shaped cross section post is wrapped up by reinforced recycled aggregate concrete.

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