CN106381956A - Concrete prefabricated shell-regenerated mixed concrete combination column and preparation method thereof - Google Patents

Abstract

The invention discloses a concrete prefabricated shell-recycled mixed concrete composite column, which sequentially includes a reinforced concrete prefabricated shell with a steel skeleton inside, a built-in steel pipe, and a recycled mixed concrete layer arranged in the inner cavity of the built-in steel pipe from outside to inside. Studs embedded in the reinforced concrete prefabricated shell are welded at even intervals on the outer wall of the built-in steel pipe. The invention also discloses a preparation method of the concrete prefabricated shell-regenerated mixed concrete composite column. The concrete prefabricated shell-recycled mixed concrete composite column provided by the present invention, on the one hand, the prefabricated concrete prefabricated shell has light weight, is convenient for transportation, and can realize industrial production; It plays the role of restraint and protection, and enhances the fireproof and anti-corrosion performance of the concrete prefabricated shell-recycled mixed concrete composite column.

Description

Concrete prefabricated shell-recycled mixed concrete composite column and preparation method thereof

technical field

The invention relates to the technical field of waste concrete recycling, in particular to a concrete prefabricated shell-recycled mixed concrete composite column and a preparation method thereof.

Background technique

Compared with cast-in-place concrete columns, prefabricated concrete columns have the advantages of higher production efficiency, less environmental pollution, less waste of material and energy, and better engineering quality, and are widely used in the field of civil engineering at home and abroad. However, the prefabricated prefabricated concrete column has a large self-weight, does not use transportation, and is difficult to hoist. The invention has light weight, convenient transportation and construction, and can effectively solve the above problems.

Concrete-filled steel tube column is a composite member widely used in the field of civil engineering. On the one hand, no formwork is required to make the concrete-filled steel tube column, and the construction efficiency is high; on the other hand, the seismic performance of the concrete-filled steel tube column is significantly better than that of conventional reinforced concrete columns. However, steel is extremely susceptible to corrosion, and as a building material, steel has unavoidable defects in fire protection, such as yield point, tensile strength, and modulus of elasticity, which will drop sharply as the temperature rises. The reinforced concrete prefabricated shell is arranged on the outer surface of the built-in steel pipe, which can not only play the role of anticorrosion and fire prevention, but also impose additional constraints on the steel pipe concrete column and enhance its mechanical properties.

As the mining of natural sand and gravel damages the environment and its reserves are decreasing day by day, waste concrete, as a valuable "special resource", has attracted more and more attention at home and abroad for its recycling and utilization. However, the application range of waste concrete is small, and the application method is single. How to effectively expand the application range of waste concrete is a problem to be solved. The invention will provide an effective application way for waste coagulation.

To sum up, the existing technology has problems such as the heavy weight of prefabricated prefabricated concrete columns, poor fireproof and anti-corrosion performance of steel pipe concrete columns, and the application range of waste concrete needs to be expanded.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a concrete prefabricated shell-regenerated mixed concrete composite column and a preparation method thereof. On the one hand, the prefabricated concrete shell is light in weight, easy to transport, and can realize industrial production; on the other hand, the reinforced concrete prefabricated shell poured on the outer surface of the built-in steel pipe plays a role in restraining and protecting the built-in steel pipe, and strengthens the concrete prefabricated shell-recycling Fireproof and anticorrosion properties of mixed concrete composite columns.

The technical scheme that the present invention realizes above-mentioned purpose is:

A concrete prefabricated shell-recycled mixed concrete composite column, which sequentially includes a reinforced concrete prefabricated shell with a steel skeleton inside, a built-in steel pipe, and a recycled mixed concrete layer arranged in the inner cavity of the built-in steel pipe from outside to inside. Studs embedded in the reinforced concrete prefabricated shell are welded at even intervals on the outer wall of the steel pipe.

Further, the thickness of the reinforced concrete prefabricated shell is 12-20 cm, and the skeleton includes longitudinal bars and stirrups.

Further, the cross-sectional shape of the built-in steel pipe includes circle, square and polygon.

Further, the wall thickness of the built-in steel pipe is 6-16 mm.

Further, the peg is T-shaped.

Further, the recycled mixed concrete layer includes new concrete and waste concrete blocks that are poured and placed alternately.

Further, the waste concrete block is the waste concrete block after the old buildings, structures, roads, bridges or dams are dismantled and the protective layer and all or part of the steel bars are removed.

Further, the characteristic size of the waste concrete block is more than 100 mm.

According to the preparation method of the concrete prefabricated shell-regenerated mixed concrete composite column, comprising steps:

(1) Make a reinforced skeleton according to the design size, and set built-in steel pipes with pegs evenly spaced on the outer wall;

(1) The reinforced concrete prefabricated shell is poured using the inner and outer formwork, wherein the built-in steel pipe is used as the inner formwork during pouring, and after pouring is formed, the built-in steel pipe and the reinforced concrete prefabricated shell are tightly combined by bolts to form a whole;

(3) After hoisting the integrated concrete prefabricated shell and built-in steel pipes to the construction site, alternately pouring new concrete and placing waste concrete blocks inside the built-in steel pipes, finally forming the concrete prefabricated shell-recycled mixed concrete combination column.

Further, the mass ratio of the waste concrete block to new concrete is 1:3-1:2.

Compared with the prior art, the present invention has the following advantages:

(1) The concrete prefabricated shell is light in weight, which is convenient for transportation and construction.

(2) The prefabrication of the concrete prefabricated shell meets the conditions of industrial production, and the manufacturing speed is fast, the cost is low, and the quality is high.

(3) The materials used to make recycled mixed concrete are more environmentally friendly.

(4) The reinforced concrete prefabricated shell poured on the outer surface of the built-in steel pipe can restrain and protect the built-in steel pipe, and enhance the fireproof and anti-corrosion performance of the concrete prefabricated shell-recycled mixed concrete composite column.

(5) The use of waste concrete blocks for pouring greatly simplifies the processing processes of crushing, screening, and purification during recycling of waste concrete, saving a lot of manpower, time and energy, and realizing efficient recycling of waste concrete.

(6) The studs welded to the outer surface of the built-in steel pipe can not only resist the longitudinal shear force, but also make the built-in steel pipe and the reinforced concrete prefabricated shell tightly bonded.

Description of drawings

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention.

Fig. 2 is a transverse sectional view of an embodiment of the present invention.

Fig. 3 is a perspective sectional view of an embodiment of the present invention.

The figure shows: 1-stirrup; 2-longitudinal bar; 3-bolt; 4-built-in steel pipe; 5-new concrete; 6-waste concrete block.

detailed description

The purpose of the present invention will be further described in detail through specific examples below, and the examples cannot be repeated here one by one, but the implementation of the present invention is not therefore limited to the following examples.

Example 1

As shown in Figures 1, 2, and 3, a concrete prefabricated shell-regenerated mixed concrete composite column includes a reinforced concrete prefabricated shell with a steel skeleton inside, a built-in steel pipe, and a built-in steel pipe inner cavity from the outside to the inside. The recycled mixed concrete layer, the outer wall of the built-in steel pipe is evenly welded with pegs 3 embedded in the reinforced concrete prefabricated shell.

The thickness of the reinforced concrete prefabricated shell is 12 to 20 cm, and the skeleton located in the concrete prefabricated shell with built-in steel pipes includes evenly arranged stirrups 1 and longitudinal bars 2, the distance between the longitudinal bars 2 is 45 mm, and the distance between the stirrups 1 is 150 mm.

In this embodiment, the stirrup 1 adopts HRB335 steel bars with a diameter of 8 mm, and the spacing is 150 mm.

In this embodiment, the longitudinal bars 2 are HRB335 steel bars with a diameter of 12 mm, a spacing of 70 mm, and a length of 8000 mm.

In this embodiment, the studs 3 are T-shaped, using Φ10 studs with a spacing of 250 mm.

The cross-sectional shape of the built-in steel pipe 4 includes a circle, a square, and a polygon. In this embodiment, the cross-section of the built-in steel pipe 4 is a square, with a side length of 480 mm, a wall thickness of 6 mm, a steel pipe length of 8000 mm, and a steel grade of Q235, the measured yield strength is 269.8 MPa, and the tensile strength is 407.7 MPa.

In this embodiment, the characteristic size of the waste concrete block 6 is 120-160 mm, which is a waste concrete block after the protective layer and all steel bars are removed from an old building.

In this embodiment, the new concrete 5 is natural aggregate concrete, and the mass ratio of the new concrete 5 to the waste concrete block 6 is 1:2.

In this embodiment, the perimeter of the section of the concrete prefabricated shell-recycled mixed concrete composite column is 720 mm.

On the other hand, the preparation method of the concrete prefabricated shell-regenerated mixed concrete composite column in the above embodiment includes the steps of:

(1) Fabricate the reinforcement frame according to the design size, and arrange the built-in steel pipes 4 with pegs 3 evenly spaced on the outer wall;

(1) The reinforced concrete prefabricated shell is poured using the inner and outer formwork, wherein the built-in steel pipe 4 is used as the inner formwork during pouring, and after pouring is formed, the built-in steel pipe 4 and the reinforced concrete prefabricated shell are tightly combined by bolts to form a whole;

(3) After hoisting the integrally formed concrete prefabricated shell and built-in steel pipe 4 to the construction site, alternately pouring new concrete 5 and throwing waste concrete blocks 6 inside the built-in steel pipe 4 to finally form the concrete prefabricated shell- Recycled mixed concrete composite columns.

Specifically, in this embodiment, the new concrete 5 is natural aggregate concrete, and the mass ratio of the new concrete 5 to the waste concrete block 6 is 1:2.

As described above, the present invention can be preferably realized.

The above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A concrete prefabricated shell-regenerated mixed concrete composite column, characterized in that: from the outside to the inside, it includes a reinforced concrete prefabricated shell with a steel skeleton, a built-in steel pipe, and recycled mixed concrete arranged in the inner cavity of the built-in steel pipe The outer wall of the built-in steel pipe is evenly spaced and welded with studs (3) embedded in the reinforced concrete prefabricated shell. 2. The concrete prefabricated shell-recycled mixed concrete composite column according to claim 1, characterized in that: the thickness of the reinforced concrete prefabricated shell is 12-20 cm, and the skeleton includes uniformly arranged longitudinal bars (2) and Stirrups (1). 3. The concrete prefabricated shell-recycled mixed concrete composite column according to claim 1, characterized in that: the cross-sectional shape of the built-in steel pipe (4) includes circle, square and polygon. 4. The concrete prefabricated shell-recycled mixed concrete composite column according to claim 1, characterized in that: the wall thickness of the built-in steel pipe (4) is 6-16 mm. 5. The concrete prefabricated shell-recycled mixed concrete composite column according to claim 1, characterized in that: the studs (3) are T-shaped. 6. The concrete prefabricated shell-recycled mixed concrete composite column according to claim 1, characterized in that: the recycled mixed concrete layer includes new concrete (5) and waste concrete blocks (6) that are poured and placed alternately . 7. The concrete prefabricated shell-recycled mixed concrete composite column according to claim 6, characterized in that: the waste concrete block (6) is old buildings, structures, roads, bridges or dams demolished and protected Scrap concrete blocks after layers and full or partial reinforcement. 8. The concrete prefabricated shell-recycled mixed concrete composite column according to claim 6, characterized in that: the characteristic size of the waste concrete block (6) is more than 100 mm. 9. The preparation method of the concrete prefabricated shell-regenerated mixed concrete composite column according to any one of claims 1 to 8, characterized in that it comprises the steps of: (1) According to the design size, the reinforced steel skeleton is prepared, and the built-in steel pipes (4) with pegs (3) are evenly spaced on the outer wall; (1) The reinforced concrete prefabricated shell is poured using the inner and outer formwork, wherein the built-in steel pipe (4) is used as the inner formwork during pouring, and after pouring is formed, the built-in steel pipe (4) and the reinforced concrete prefabricated shell are tightly combined by bolts to form a whole ; (3) After hoisting the integrally formed concrete prefabricated shell and built-in steel pipe (4) to the construction site, alternately pouring new concrete (5) and throwing waste concrete blocks (6) inside the built-in steel pipe (4), Finally, the concrete prefabricated shell-recycled mixed concrete composite column is formed. 10. The preparation method according to claim 9, characterized in that: the mass ratio of the waste concrete block to new concrete is 1:3-1:2.