Fireproof coating-free shell column having built-in reinforcement cage

Abstract

The present invention provides a fireproof coating-free shell column having a built-in reinforcement cage, comprising a shell column and a reinforcement cage. The reinforcement cage is arranged in the shell column, and concrete is cast into the shell column. In the present invention, the reinforcement cage is arranged in the shell column, in the event of a fire, considering that the shell loses load-bearing functionality, the column still satisfies the structural load-bearing requirements. In this way, the column in the present invention can satisfy the fire safety code requirements without the application of any fireproof coating, achieving the fireproof coating-free technical effect, ensuring that the outer surface of the column body can retain architectural features thereof and components feature a regular shape and an appropriate weight, facilitating long-distance transportation, and achieving excellent cost-effectiveness.

Description

A fireproof coating-free shell column with built-in steel cage Technical Field

[0001] This invention relates to the field of shell column technology, and more particularly to a fireproof coating-free shell column with an internal steel reinforcement cage. Background Technology

[0002] Nantong Ouben Construction Technology Co., Ltd.'s patent: A composite column of solid steel bars and corrugated steel plates, publication number: 202121349195.2; abbreviated as "steel bar shell column," features high steel utilization, good seismic performance, no need for formwork or support during construction, and easy concrete pouring, and has been applied in engineering projects. Research shows that for composite columns with steel cladding, under fire conditions, the outer surface heats up faster than the interior, and the stiffness and strength of the components degrade faster than in reinforced concrete columns. Therefore, fireproof coatings or fireproof boards are often required on the outer surface of the column to meet the load-bearing requirements under fire conditions. However, fireproof protective layers not only increase costs and add extra steps but also affect aesthetics. If a reinforcing cage is added inside the shell column, the load-bearing capacity problem under fire conditions can be solved, thus eliminating the need for a fireproof protective layer on the outer surface of the column.

[0003] Summary of the Invention

[0004] The purpose of this invention is to propose a shell column with an internal steel cage, which has a good fire protection effect and achieves the technical effect of eliminating the need for fire-retardant coating.

[0005] To achieve the above objectives, the present invention proposes a fireproof coating-free shell column with an internal steel reinforcement cage, comprising a shell column and a steel reinforcement cage;

[0006] The steel cage is placed inside the shell column, and concrete is poured inside the shell column.

[0007] Furthermore, the shell pillars are steel bar shell pillars, which include four solid steel bars located at the corners, with corrugated side plates arranged laterally between adjacent solid steel bars.

[0008] Furthermore, the four corners of the shell pillars are made of angle steel profiles, which are L-shaped or U-shaped.

[0009] Furthermore, the cross-section of the reinforcing cage is rectangular or circular.

[0010] Furthermore, the steel cage consists of longitudinal bars and stirrups. Multiple longitudinal bars are arranged at equal intervals to form a circular or square longitudinal bar column, and are fixed by binding or welding with stirrups.

[0011] Furthermore, the number of longitudinal reinforcement bars shall not be less than four.

[0012] Furthermore, multiple longitudinal bars are arranged at equal intervals along the vertical direction of the longitudinal bar column, or are spirally fixed to the outside of the longitudinal bar column.

[0013] Furthermore, the steel cage and the shell column are positioned using limit clips;

[0014] The limiting clip is attached to the longitudinal reinforcement and then clamped between the four corner steel pipes of the shell column.

[0015] Furthermore, concrete is poured on-site.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. It enables on-site concrete pouring without the need for formwork or supports, simplifying on-site construction steps and shortening the construction cycle.

[0018] 2. Under normal use conditions without fire, the designed outer shell and internal reinforced concrete work together to bear axial force, bending moment and shear force, and have good stress performance.

[0019] 3. Due to the internal steel reinforcement cage, the column still meets structural load-bearing requirements even when the outer shell is deactivated during a fire. Therefore, this type of column does not require fire-retardant coating while still meeting fire safety regulations, achieving the technical effect of fire-retardant-free coating and ensuring the aesthetic appearance of the column's exterior surface.

[0020] 4. The surface has a wavy shape, giving it an architectural appearance; the components are regularly shaped, with appropriate weight, making them convenient for long-distance transportation and economically viable. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the overall structure of the shell column with built-in steel cage in an embodiment of the present invention;

[0022] Figure 2 is a cross-sectional perspective view of the steel bar shell column with built-in reinforcing cage in an embodiment of the present invention;

[0023] Figure 3 is a sectional perspective view of the spiral angle steel shell column in an embodiment of the present invention;

[0024] Figure 4 is a cross-sectional perspective view of the L-shaped angle steel shell column in an embodiment of the present invention;

[0025] Figure 5 is a perspective view of the steel cage with a rectangular cross-sectional shape in an embodiment of the present invention;

[0026] Figure 6 is a perspective view of the steel cage with a circular cross-sectional shape in an embodiment of the present invention;

[0027] Figure 7 shows the relative positions of the steel shell, the reinforcing cage, and the limiting card in an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be further described below.

[0029] Example 1:

[0030] As shown in Figure 1, the present invention proposes a fireproof coating-free shell column with an internal steel cage, including a shell column 1 and a steel cage 2; the steel cage 2 is placed inside the shell column 1, and concrete 3 is poured inside the shell column 1. The concrete 3 can be precast in the factory or poured on site.

[0031] As shown in Figure 2, the shell column 1 is a steel bar shell column, which includes four solid steel bars 11 located at the corners. Corrugated web plates 12 are arranged transversely between adjacent solid steel bars 11. The reinforcing cage 2 adopts four longitudinal bars 21 and multiple stirrups 22 as shown in Figure 5. The four longitudinal bars 21 form a cuboid structure. The multiple stirrups 22 fix the longitudinal bars 21 at equal intervals around the height direction of the cuboid column. The fixing method can be binding or welding.

[0032] In this embodiment, in order to facilitate the fixing of the steel cage 2 during the on-site prefabrication stage, as shown in Figure 7, a limiting clip 4 is respectively attached to the first end of the four longitudinal bars 21 of the steel cage 2. The limiting clip 4 is placed on the end of the corrugated web 12 and is just locked at the four corners of the shell column 1 to achieve locking and positioning. Then, concrete 3 is poured on-site. The positioning of the steel cage 2 is firm and the construction is convenient.

[0033] The advantages of this invention are as follows: Under normal use conditions without fire, the designed outer shell and the internal reinforced concrete 3 work together to bear axial force, bending moment, and shear force, exhibiting excellent structural performance. Because of the internal reinforcing cage 2, even in a fire, considering the outer shell being deactivated, the column still meets structural load-bearing requirements. Therefore, this type of column can meet fire safety regulations without the need for fire-retardant coating, achieving the technical effect of fire-retardant-free construction and ensuring the aesthetic appearance of the column's exterior surface.

[0034] Furthermore, compared to traditional fire-resistant steel columns, the shell column with an internal steel cage of the present invention also has the technical advantage of lower transportation costs:

[0035] To replace local PC components by exporting them from China to Europe:

[0036] The most cost-effective "weight-to-volume ratio" (the ratio of weight to external volume) for export sea freight is 0.35 tons / cubic meter for containers and 1 ton / cubic meter for bulk cargo.

[0037] a) Based on experience in Hungary, steel structures are not widely used because they have strict fire resistance requirements, and fire-retardant coatings are very expensive. For a 2-hour fire resistance rating, the price of fire-retardant coating reaches 480 RMB per square meter; for a 600*600mm column, the price is 1152 RMB per meter.

[0038] b) Steel bar shell columns, suitable for ocean shipping, can replace PC columns and do not require fire retardant coating.

[0039] c) In Hungary, the cost of PC columns, including installation, is 800-900 euros per cubic meter; a single PC column is 10m long with a cross-section of 0.6m x 0.6m and a volume of 3.6m³. 3 Based on a price of €800 per cubic meter, the price of one PC column is €3060, equivalent to RMB 24480. The unit price per meter = 0.6 * 0.6 * €850 * 8 (exchange rate) = RMB 2448 per meter.

[0040] Using steel-framed columns, due to the increased steel consumption, the cross-section is changed to 0.5m*0.5m. The steel profile uses 45mm*45mm square steel bars, and the corrugated plate thickness is 2.0mm. The longitudinal reinforcement is 4d16, and the stirrups are d8@200. The total weight of the steel shell and square steel bars is 95.3 kg per meter, equivalent to 381 kg / cubic meter; this is suitable for sea transport. Based on an export price of 23,000 RMB / container; one container holds 16 columns, weighing 15 tons; the freight cost is 1,500 RMB per ton; assuming an export sales price of 10,000 RMB / ton; installation cost of 2,000 RMB / ton; and a local concrete price of 160 Euros / cubic meter, the unit price of this column is: 95.3 kg * (10 for materials + 2 for installation + 1.5 for freight) + 0.5 * 0.5 cross-sectional area * (1280 for materials + pouring) = RMB 1607 / meter, saving 35% compared to PC columns.

[0041] Therefore, the shell column with built-in steel cage of the present invention is very suitable for export to overseas markets, with low cost and high economy.

[0042] Example 2:

[0043] As shown in Figure 3, the other structures of Embodiment 2 are the same as those of Embodiment 1, except that the corners of the shell pillars are made of angle steel profile 11, which is U-shaped and has a relatively low steel cost.

[0044] Example 3:

[0045] As shown in Figure 4, the other structures of Embodiment 3 are the same as those of Embodiment 1, except that the corners of the shell pillars are made of angle steel profile 11, which is L-shaped and has a relatively low steel cost.

[0046] Example 4:

[0047] As shown in Figure 6, the other structures of Embodiment 4 are the same as those of Embodiment 1, except that the longitudinal bars 21 of the steel cage are formed into a cylindrical structure, and the stirrups 22 adopt a spiral structure. The load-bearing structure and overall integrity are good.

[0048] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the scope of protection of the present invention.

Claims

1. A fireproof coating-free shell column with an internal steel reinforcement cage, characterized in that, Including shell columns and steel cages; The steel cage is placed inside the shell column, and concrete is poured inside the shell column.

2. The fire-resistant, coating-free shell column with an internal steel reinforcement cage according to claim 1, characterized in that, The shell column is a steel bar shell column, which includes four solid steel bars located at the corners, and the corrugated side plates are arranged laterally between adjacent solid steel bars.

3. The fire-resistant, coating-free shell column with an internal steel reinforcement cage according to claim 1, characterized in that, The four corners of the shell pillar are all made of angle steel profiles, which are L-shaped or U-shaped.

4. The fire-resistant, coating-free shell column with an internal steel reinforcement cage according to claim 1, characterized in that, The cross-section of the steel cage is rectangular or circular.

5. The fire-resistant, coating-free shell column with an internal steel reinforcement cage according to claim 4, characterized in that, The steel cage is composed of longitudinal bars and stirrups. Multiple longitudinal bars are arranged at equal intervals to form a circular or square longitudinal bar column, and are fixed by binding or welding with the stirrups.

6. The fire-resistant, coating-free shell column with an internal steel reinforcement cage according to claim 5, characterized in that, The number of longitudinal bars shall not be less than four.

7. The fire-resistant, coating-free shell column with an internal steel reinforcement cage according to claim 5, characterized in that, Multiple longitudinal reinforcement bars are arranged at equal intervals along the vertical direction of the longitudinal reinforcement column, or are spirally fixed to the outside of the longitudinal reinforcement column.

8. The fire-resistant, coating-free shell column with an internal steel reinforcement cage according to claim 1, characterized in that, The steel cage and the shell column are positioned by a limiting clip; The limiting clip is fitted onto the longitudinal reinforcement and then clamped between the four corner steel pipes of the shell column.

9. The fire-resistant, coating-free shell column with an internal steel reinforcement cage according to claim 1, characterized in that, The concrete was poured on-site.

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