CN211257558U - A L-shaped steel tube recycled concrete special-shaped column with perforated T-ribs - Google Patents

Abstract

The utility model discloses an L-shaped steel tube recycled concrete special-shaped column with perforated T-shaped ribs, which comprises an L-shaped steel tube frame, a T-shaped rib frame, a reinforcing hoop frame and a fully recycled concrete; the L-shaped steel tube frame is composed of a plurality of The steel plate is welded; the T-shaped rib frame is welded by two steel plates, and the web is provided with holes, and the opening T-shaped ribs are welded with the inner wall of the L-shaped steel pipe in a parallel or staggered manner; the reinforcing hoop frame is made of The reinforcing cage formed by the binding of spiral stirrups and longitudinal bars; the coarse aggregates of the fully recycled concrete are all derived from waste concrete. In the above scheme, the L-shaped steel pipe and the reinforcing hoop can improve the bearing capacity of the fully recycled concrete and promote the recycling rate of waste concrete; the opening T-shaped rib can improve the bonding performance between the steel pipe and the fully recycled concrete, and delay the local buckling of the steel pipe.

Description

A L-shaped steel tube recycled concrete special-shaped column with perforated T-ribs

technical field

The utility model relates to a building component, in particular to an L-shaped concrete-filled steel tube special-shaped column using fully recycled concrete and perforated T-shaped ribs, belonging to the technical field of steel and concrete composite structures.

Background technique

With the rapid development of urban construction in my country, the reinforcement and repair of existing buildings, the continuous development and large-scale construction of new urban areas and residential quarters, and the new construction of municipal public facilities will generate a large amount of construction waste. In addition, every year in our country, a large number of building structures are demolished because they reach the designed service life. According to statistics, during the "Twelfth Five-Year Plan" period, the construction area of my country's annual demolition is about 460 million square meters, and every 10,000 square meters of demolition projects will produce 7,000 tons - 12,000 tons of construction waste. However, the vast majority of construction waste is mainly treated by backfilling, burial and open storage, which consumes huge construction costs such as land acquisition fees and waste removal costs. At the same time, a large amount of construction waste is piled up randomly, which not only occupies land, but also pollutes the environment and directly or indirectly affects air quality. Construction waste has aggravated the tension of urban land and resources in my country, and seriously affected the coordinated development of social economy and ecological environment.

At the same time, demand for concrete continues to increase. According to statistics, in the past five years, the average annual consumption of concrete is about 2 billion cubic meters, and the consumption of natural aggregate is about 4 billion tons. A large number of natural sand and gravel aggregates are depleted due to continuous mining, causing ecological damage. It can be seen that it is imminent and significant to study the recycling and utilization of waste concrete.

At present, with the rapid development of high-rise and super-high-rise buildings in China, CFST column is a composite structure that combines the advantages of steel tube structure and concrete structure. At the same time, the special-shaped column structure system avoids the problem of protruding column ridges and occupying building space of ordinary frame columns, improves the architectural view, and brings flexibility and convenience to architectural design and use functions. The recycled concrete is poured into the steel tube special-shaped column to form the steel tube recycled concrete special-shaped column, and the restraint effect of the external steel tube on the internal recycled concrete can significantly improve the mechanical performance of the recycled concrete, and promote the application and promotion of the recycled concrete. Compared with special-shaped concrete columns, the structural system has the characteristics of simple construction, saving formwork, excellent bearing capacity and seismic capacity.

However, because the column mainly bears axial pressure, when the CFST special-shaped column reaches the ultimate bearing capacity, the corner steel tube will undergo plastic deformation, and the steel tube and concrete in the middle of each limb of the special-shaped column are prone to peeling or local instability. The research shows that the main reason for the above technical problems is the insufficient binding force of the outer steel pipe to the core concrete. In the current practical application, in order to make up for the deficiency of the steel tube's insufficient confinement capacity to the core concrete, structural measures such as welding studs or rectangular rib plates on the inner wall of the steel tube are mainly adopted, which are labor-intensive and unsatisfactory.

SUMMARY OF THE INVENTION

Purpose of the utility model: In view of the large amount of construction waste that needs to be dealt with urgently, the excessive exploitation of natural resources, and the shortcomings of the existing special-shaped column technology, to provide a high-bearing capacity, strong cooperative work performance and good stability, which can efficiently realize construction waste. Recycled concrete special-shaped column with perforated T-rib and L-shaped steel tube for resource utilization.

Technical scheme: an L-shaped steel tube recycled concrete special-shaped column with perforated T-shaped rib, including an L-shaped steel tube frame, a T-shaped rib frame, a reinforcing hoop frame and fully recycled concrete; the L-shaped steel tube frame is welded by steel plates. The T-shaped rib frame is welded by two steel plates, and the web is provided with holes, and the opening T-shaped rib is welded with the inner wall of the L-shaped steel pipe in a parallel or staggered manner; the reinforcing hoop frame is made of spiral stirrups and Reinforcing cage formed by binding longitudinal bars; the coarse aggregates in the fully recycled concrete are all derived from waste concrete.

As a further optimization of the scheme, the opening T-shaped rib has holes evenly and equally spaced on the web, the shape of the holes is a circle or a regular hexagon, and the hole centers are located on the same vertical line, and the hole spacing is 100 mm – 300 mm. mm.

As a further optimization of the scheme, the reinforcing hoop frame is arranged at the intersection of the vertical and horizontal columns. The spacing d of the spiral stirrups is 40 mm – 80 mm, and the diameter is 8 mm – 12 mm; 6 longitudinal bars are evenly arranged along the circumference of the reinforcing hoop, and the diameter is 6 mm – 10 mm, and the diameter of the longitudinal bars is smaller than the diameter of the spiral stirrups.

As a further optimization of the scheme, the strength grade of the fully recycled concrete is C30, and the strength grade of the waste concrete is not lower than C25; in parts by weight, the mixing ratio of the fully recycled concrete is, water: cement: sand: recycled coarse aggregate : fly ash: water reducing agent = 1:1.60:1.87:4.17:0.32:0.01.

Beneficial effects:

(1) Compared with the reinforced concrete special-shaped column, the steel tube recycled concrete special-shaped column does not need formwork, the construction is simple, and has high bearing capacity and good plastic deformation capacity; The bearing capacity and lateral deformation performance of the corresponding fully recycled concrete enable the excellent mechanical properties of the steel tube recycled concrete special-shaped column to be fully exerted;

(2) On the vertical opening T-rib web, a plurality of holes arranged at equal intervals are opened, and after the fully recycled concrete is poured, the fully recycled concrete on both sides of the T-shaped rib web can play a shear resistance role. , the fully recycled concrete filled in the hole is equivalent to a plurality of vertically distributed pins inserted into the hole, at the same time, the flange of the T-shaped rib effectively limits the separation of the inner wall of the steel pipe and the fully recycled concrete. The web, flange and fully recycled concrete work together, which greatly improves the current problem of insufficient adhesion between steel tubes and concrete. The overall working performance of the column;

(3) All-recycled concrete not only saves resources, protects the ecological environment, but also reduces the land occupied by waste concrete landfills, which is in line with the environmental protection tenet of “lucid waters and lush mountains are invaluable assets” advocated by the state; at the same time, in steel and concrete The application of fully recycled concrete in the field of composite structures increases the range of recycling and regeneration of waste concrete, which is of great and far-reaching significance for the efficient resource utilization of construction waste.

Description of drawings

1 is a schematic plan view of an L-shaped steel tube recycled concrete special-shaped column with perforated T-shaped ribs in Example 1;

2 is a schematic plan view of an L-shaped steel tube recycled concrete special-shaped column with perforated T-shaped ribs in Example 2;

Fig. 3 is the three-dimensional schematic diagram of opening round hole T-shaped rib;

Figure 4 is a three-dimensional schematic view of opening a regular hexagonal hole T-shaped rib;

Fig. 5 is the three-dimensional schematic diagram of reinforcing hoop in embodiment 1～2;

Figure 6 is a schematic view of the T-rib web circular hole cutting;

Fig. 7 is the schematic diagram of the open-hole web after the T-rib is formed;

Figure 8 is a schematic diagram of the regular hexagonal hole cutting of the T-rib web;

Figure 9 is a schematic diagram of a web with regular hexagonal holes opened after the T-shaped rib is formed.

In Figures 1 and 2: 1 – L-shaped steel tube, 2 – T-rib with opening, 3 – Reinforcing hoop, 4 – Fully recycled concrete.

Detailed ways

As shown in Figures 1 to 5, the L-shaped steel tube recycled concrete special-shaped column with perforated T-shaped ribs of the present invention includes an L-shaped steel tube frame (1), a T-shaped rib frame (2), and a reinforcing hoop frame (3). and fully recycled concrete (4). Among them, the L-shaped steel pipe frame is welded by multiple steel plates, the steel plate grade is Q235 or Q355, the plate thickness is 4 mm – 8 mm, and the maximum width-thickness ratio is 60. The steel plate welding adopts butt weld, which can be partially or fully welded. ; The reinforcing hoop skeleton is a steel cage formed by the binding of spiral stirrups and longitudinal bars; the coarse aggregates in the fully recycled concrete are all derived from waste concrete.

In a further embodiment, the reinforcing hoop frame is positioned at the intersection of the longitudinal and transverse columns. Spiral stirrups are bent from smooth or hot-rolled ribbed steel bars, with a strength class of HPB300, HRB335, HRB400 or HRB500, with a spacing d of 40 mm – 80 mm, and a diameter of 8 mm – 12 mm; Reinforcing bars, with a strength grade of HPB300, are evenly arranged along the circumference of the reinforcing hoop, with a diameter of 6 mm – 10 mm, and the diameter of the longitudinal bars is smaller than the diameter of the spiral stirrups.

In a further embodiment, the strength grade of fully recycled concrete is C30, and the strength grade of waste concrete is C25; in parts by weight, the mixing ratio of fully recycled concrete is, water: cement: sand: recycled coarse aggregate: fly ash: Superplasticizer = 1:1.60:1.87:4.17:0.32:0.01. The standard method specified in the industry was used for testing, and the experimental data were as follows: slump 180 mm, excellent workability, 28-day cube failure load of 735.75 kN, and compressive strength of 32.7 MPa.

In a further embodiment, the web of the T-shaped rib is first perforated, and then the T-shaped rib frame is formed by welding the perforated web and another flange steel plate. The steel plate used is Q235 or Q355, the plate thickness is 4 mm – 10 mm, the maximum aspect ratio is 40, and the butt full penetration weld is used for the welding of the web and the flange. The holes opened by the T-shaped rib on the web are evenly and equally spaced, the shape of the holes is a circle or a regular hexagon, and the centers of the holes are located on the same vertical line, and the distance between the holes is 100 mm – 300 mm. The opening T-shaped rib is welded with the inner wall of the L-shaped steel pipe in a parallel or staggered manner, and a double-sided fillet weld can be used.

Example 1

In this embodiment, the T-shaped rib has circular holes evenly and equally spaced on the web (see Figure 3), and the drilling process is shown in Figure 6: first, cut along a predetermined dashed line from one end of the web, and then cut from one end of the web. The other end of the web is cut along a predetermined dotted line. After the cutting is completed, two webs of ① and ② are produced, and the two webs of ① and ② are staggered and connected, so that the trough of the No. 1 web is aligned with the crest of the No. , the two webs ① and ② are welded to form by butt full penetration weld. The formed open-hole web is shown in Figure 7. In this embodiment, due to the large thickness of the L-shaped special-shaped column legs, the open-hole T-shaped ribs are welded to the inner walls of the two steel pipes opposite to the leg length direction in a parallel manner (see Figure 1). The T-shaped rib spacing is 200 mm. The height of the web section shall not exceed 1/3 of the leg thickness.

Example 2

In this embodiment, the T-shaped rib has regular hexagonal holes evenly and equally spaced on the web (see Fig. 4), and the opening process is shown in Fig. 8: cutting from the right end of the web along a predetermined dashed line, resulting in ①, ②Two webs, stagger the two webs ① and ②, so that the half regular hexagonal hole of No. ① web is aligned with the half regular hexagonal hole of No. The two webs ① and ② are welded to form by butt full penetration weld. The formed open regular hexagonal hole web is shown in Figure 9. In this embodiment, since the thickness of the L-shaped special-shaped column legs is relatively small, the opening T-shaped ribs are welded with the inner walls of the two steel pipes opposite to the length of the legs in a staggered manner (see Figure 2). The T-shaped ribs are 150 mm apart. The height of the rib web section should be greater than 1/2 of the limb thickness.

In the above embodiment, the L-shaped steel pipe is convenient for design and construction, avoids the protruding column corrugation, and improves the bearing capacity of the fully recycled concrete. The synergistic effect promotes the recycling rate of waste concrete; the vertical opening T-shaped rib has one more flange than the ordinary rib, and the web is evenly perforated, so that the cast-in-place fully recycled concrete can be connected into a whole, which can significantly improve Strengthen the bonding performance between the steel pipe and the fully recycled concrete, and effectively delay the occurrence of local buckling of the steel pipe. The perforated T-shaped rib and the reinforcing hoop adopted by the utility model can give full play to the material properties of the steel pipe and the fully recycled concrete, ensuring that the structure has high bearing capacity and good seismic performance; at the same time, the T-shaped rib perforation method saves Steel, increase the height of the web section and reduce the project cost.

The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solutions disclosed in the present invention, those skilled in the art can make some technical features according to the disclosed technical content without creative work. Replacement and deformation, these replacements and deformations are within the protection scope of the present invention.

Claims (3)

1. The utility model provides a take L shape steel pipe recycled concrete special-shaped column of trompil T shape rib, includes L shape steel pipe skeleton (1), T shape rib skeleton (2), strengthens hoop skeleton (3) and full recycled concrete (4), its characterized in that: the L-shaped steel pipe framework is formed by welding a plurality of steel plates; the T-shaped rib framework is formed by welding two steel plates, a web plate is provided with a hole, and the T-shaped ribs with the holes are welded with the inner wall of the L-shaped steel pipe in a parallel or staggered mode; the reinforcing hoop framework is a reinforcement cage formed by binding spiral stirrups and longitudinal reinforcements; the coarse aggregate in the fully recycled concrete is completely derived from waste concrete.

2. The L-shaped recycled concrete profiled pole with the open-celled T-shaped rib as claimed in claim 1, wherein: holes are uniformly arranged on the web plate at equal intervals on the perforated T-shaped ribs, the holes are circular or regular hexagonal, the hole centers are located on the same vertical line, and the hole intervals are 100-300 mm.

3. The L-shaped recycled concrete profiled pole with the open-celled T-shaped rib as claimed in claim 1, wherein: the reinforcing hoop framework is arranged at the intersection of the longitudinal and transverse column limbs and the space between the spiral hoopsdThe diameter of the longitudinal ribs is 8 mm-12 mm, 6 longitudinal ribs are uniformly distributed along the circumference of the reinforcing hoop, the diameter of the longitudinal ribs is 6 mm-10 mm, and the diameter of the longitudinal ribs is smaller than that of the spiral hoops.

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