Fabricated fire-resistant composite column manufacturing method
By using UHPC filling materials and high-performance fibers in steel tube concrete composite columns, combined with a fireproof layer, the problems of insufficient fire resistance and durability of traditional composite columns are solved, and the structural stability and durability in high temperature environments are improved.
Patent Information
- Application Number
- CN202511137386.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-14
- Publication Date
- 2025-10-17
AI Technical Summary
Traditional steel tube concrete composite columns have deficiencies in fire resistance and durability, especially in high-temperature fire environments where the structure is prone to failure, and the concrete filling material is prone to cracking and has poor durability.
UHPC is used as the filling material, combined with PP fiber and high-performance fiber, steel pipes are used as the external constraint structure, and a fireproof layer is set on the outside to form an assembled fire-resistant composite column.
The toughness and crack resistance of the composite columns are improved, the structural stability and fire resistance in high temperature environments are enhanced, the service life is extended, and the structural integrity is ensured not to become unstable and collapse in a fire.
Smart Images
Figure CN120791932A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of building structure engineering, and particularly relates to a manufacturing method of a fabricated fire-resistant composite column. BACKGROUND
[0002] The fabricated monolithic reinforced concrete structure refers to a reinforced concrete structure which is connected into a whole by prefabricating parts of components in a prefabricating factory or workshop, transporting to a site for assembly, and pouring concrete on the assembled components.
[0003] Although the traditional steel pipe concrete composite column has certain bearing capacity and seismic performance, the fire resistance and durability still need to be improved. Especially in a high-temperature fire environment, the strength of the steel pipe will rapidly decrease, resulting in failure of the overall structure. In addition, the traditional concrete filling material also has many limitations, such as easy cracking, poor durability, etc. Therefore, it is necessary to develop a composite column structure to meet higher performance requirements. SUMMARY
[0004] The purpose of the present application is to provide a manufacturing method of a fabricated fire-resistant composite column to solve the problems existing in the prior art and improve the durability and fire resistance of the composite column.
[0005] To achieve the above purpose, the present application provides the following solutions.
[0006] The present application provides a manufacturing method of a fabricated fire-resistant composite column, comprising the following steps:
[0007] S1, producing a steel pipe according to the designed size;
[0008] S2, uniformly stirring each raw material of UHPC and PP fiber by a forced stirrer to form UHPC slurry;
[0009] S3, pouring the UHPC slurry with the pre-cut high-performance fiber into a mold, and gently vibrating with a vibrating rod;
[0010] S4, rapidly pouring the UHPC slurry with the high-performance fiber into the steel pipe in S1, and using an insertion type vibrator for layered vibration and compaction; after pouring is completed, covering plastic film on both ends of the steel pipe for maintenance to prevent water from evaporating too fast;
[0011] S5, after maintenance is completed, setting a fireproof layer on the surface of the steel pipe completed in S4.
[0012] Preferably, the fireproof layer is a layer of special fireproof paint with a thickness of about 20 mm or a layer of fireproof board.
[0013] Preferably, the high-performance fiber is glass fiber cloth.
[0014] Preferably, the raw materials of the UHPC include cement, silica fume, quartz sand and superplasticizer.
[0015] Preferably, in S1, the steel pipe is formed by rolling a steel plate into a circular shape and welding.
[0016] Preferably, in S4, layer-by-layer vibration compaction is performed using an insert vibrator.
[0017] Preferably, when the fireproof layer is the fireproof plate, the fireproof plate is fixed on the steel pipe by combination screws.
[0018] The present application has the following technical effects relative to the prior art:
[0019] The manufacturing method of the assembled fire-resistant composite column provided by the present application uses UHPC containing PP fibers as the filling material inside the steel pipe, which serves as the main load-bearing and force-transferring medium. The addition of PP fibers can improve the toughness and crack resistance of the UHPC, effectively inhibit the plastic shrinkage and dry shrinkage of the UHPC, and reduce the generation of cracks, thereby prolonging the service life of the structure. The UHPC has excellent toughness and durability, with a compressive strength usually exceeding 150 MPa, which is several times that of traditional concrete. Moreover, the internal pores of the UHPC are few and small, and stress can be better dispersed when force is applied, thereby avoiding the generation and expansion of cracks. The high-performance fibers arranged inside the UHPC can not only enhance the fire resistance of the composite column and keep the performance stable at a certain high-temperature environment, but also enhance the interlayer bonding force of the concrete to prevent interlayer sliding or peeling. The high-performance fibers can prevent the expansion of cracks by absorbing and dispersing the crack tip, thereby further enhancing the crack resistance and overall stability of the concrete. The steel pipe serves as an external restraint structure, providing lateral support and protecting the internal filling material from the external environment. The fireproof layer can effectively insulate the direct action of high-temperature flames on the steel pipe, slowing down the temperature rise speed of the steel pipe, thereby providing more protection time for the internal concrete. The above-mentioned arrangements make the composite column not only have high bearing capacity, but also have good ductility and energy dissipation capacity, so that it performs well in a high-temperature fire environment and can maintain structural integrity for a long time without instability and collapse. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0021] Fig. 1The overall structural schematic diagram of the assembled fire-resistant composite column provided by the present application is shown in the figure.
[0022] Fig. 2 The internal structural schematic diagram of the assembled fire-resistant composite column provided by the present application is shown in the figure.
[0023] In the figure: 1-UHPC slurry; 2-steel pipe; 3-fireproof layer; 4-combination screw; 5-PP fiber; 6-quartz sand; 7-silica ash; 8-fireproof coating smearing surface. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0025] The purpose of the present application is to provide an assembled fire-resistant composite column manufacturing method to solve the problems existing in the prior art and improve the durability and fire resistance of the composite column.
[0026] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.
[0027] Embodiment one
[0028] The present embodiment provides an assembled fire-resistant composite column manufacturing method, as shown in the figure, comprising the following steps: Figs. 1-2
[0029] S1, producing a steel pipe 2 according to the designed size;
[0030] S2, uniformly stirring each raw material of UHPC and PP fiber 5 through a forced stirrer to form UHPC slurry 1;
[0031] S3, pouring the pre-cut high-performance fiber matched with the configured UHPC slurry 1 into the mold and lightly vibrating with a vibrating rod (to ensure that the high-performance fiber and the UHPC slurry 1 are tightly combined without gaps);
[0032] S4, quickly pouring the UHPC slurry 1 with high-performance fiber into the steel pipe 2 in S1 and using an insertion type vibrator for layered vibration and compaction; after pouring is completed, covering plastic film on both ends of the steel pipe 2 for curing to prevent water from evaporating too quickly (affecting the development of strength);
[0033] S5, after curing is completed, setting a fireproof layer 3 on the surface of the steel pipe 2 completed in S4.
[0034] By adopting UHPC containing PP fibers 5 as the filling material inside the steel pipe 2, it serves as the main load-bearing and force-transmitting medium, the addition of PP fibers 5 can improve the toughness and crack resistance of UHPC, effectively inhibit the plastic shrinkage and drying shrinkage of UHPC, reduce the generation of cracks, thereby prolonging the service life of the structure; UHPC has superior toughness and durability, its compressive strength is usually more than 150 MPa, several times that of traditional concrete, and its internal pores are few and small, which can better disperse stress and avoid the generation and expansion of cracks when stressed; The high-performance fibers arranged inside the UHPC can not only enhance the fire resistance of the composite column and maintain stable performance in a certain high-temperature environment, but also can enhance the interlayer bonding force of the concrete to prevent interlayer sliding or peeling, which can prevent crack propagation by absorbing and dispersing the ability of crack tip, further enhancing the crack resistance and overall stability of the concrete; The steel pipe 2 as an external restraint structure provides lateral support and protects the internal filling material from the external environment; The fireproof layer 3 arranged can effectively insulate the direct action of high-temperature flame on the steel pipe 2, delay the temperature rising speed of the steel pipe 2, thereby providing more protection time for the internal concrete; The above-mentioned arrangements make the composite column not only have high bearing capacity, but also have good ductility and energy dissipation capacity, so that it performs well in high-temperature fire environment and can maintain structural integrity for a long time without instability and collapse.
[0035] Among them, the related description of the steel pipe 2 is as follows:
[0036] In the optional scheme of the present embodiment, preferably, in S1, the steel pipe 2 is formed by rolling a steel plate into a circular shape according to the designed size and performing welding treatment (to ensure good sealing and no leakage phenomenon occurs). The steel plate is a common and widely produced building material with various specifications. By rolling, the steel plate can be accurately cut according to the actual size required by the composite column, maximizing the use of raw materials, reducing the generation of corner waste, improving material utilization, and thereby reducing costs.
[0037] Among them, the related description of the UHPC is as follows:
[0038] In the optional scheme of the present embodiment, preferably, the raw materials of UHPC include cement, silica fume 7, quartz sand 6 and high-efficiency water reducing agent (various raw materials are accurately weighed according to the mixing ratio requirements, including but not limited to the above-mentioned raw materials).
[0039] Among them, the related description of the high-performance fiber is as follows:
[0040] In the optional scheme of the embodiment, preferably, the high-performance fiber is a glass fiber cloth. The glass fiber cloth has high tensile strength. When combined with the UHPC slurry 1, the glass fiber cloth can effectively enhance the tensile capacity of the composite column. When subjected to tensile force, the glass fiber cloth can bear part of the tensile force, delay the generation and expansion of cracks in the UHPC matrix, thereby improving the tensile performance of the composite column as a whole, making it more stable under complex stress state. The addition of the glass fiber cloth significantly improves the brittleness of the UHPC, making the composite column have better toughness. When subjected to impact or vibration load, the glass fiber cloth can absorb energy and buffer external force through its deformation, preventing sudden brittle failure of the composite column and improving the safety and reliability of the structure.
[0041] Among them, the related setting of the fireproof layer 3 is as follows:
[0042] In the optional scheme of the embodiment, preferably, the fireproof layer 3 is a layer of special fireproof paint (such as Fig. 2 ) with a thickness of about 20 mm (as shown in the position of the fireproof paint coating surface 8) or a layer of fireproof board. The special fireproof paint has good fireproof and heat insulation performance. The thickness of 20 mm can form an effective heat insulation barrier when a fire occurs. When the temperature rises, the fireproof paint will undergo physical or chemical reactions such as expansion, further increasing its heat insulation effect, delaying the heating speed of the steel pipe 2 and the internal concrete, and ensuring that the composite column maintains structural strength within the specified time to prevent rapid destruction of the structure due to high temperature. The coating method can make the fireproof paint closely adhere to the surface of the steel pipe 2, seamlessly covering the steel pipe 2 column, effectively avoiding the problem of rapid heat transfer due to the existence of gaps. The fireproof board usually has high strength and good fireproof performance, which can provide reliable fireproof protection for the composite column. In a fire, the fireproof board can withstand a certain high temperature and flame impact and is not easy to deform or damage, effectively preventing heat transfer to the steel pipe 2 and the internal concrete, and ensuring the structural integrity of the composite column in a fire.
[0043] In the optional scheme of the embodiment, preferably, when the fireproof layer is a fireproof board, the fireproof board is fixed on the steel pipe 2 by the combination screws 4.
[0044] Among them, the related setting of the fireproof layer 3 is as follows:
[0045] In the optional solution of the embodiment, preferably, in S4, the layered vibratory compaction is performed using an insertion vibrator to fill the steel pipe 2 with concrete and without obvious bubbles. The insertion vibrator can directly transmit vibration energy to the inside of the concrete, so that the components such as aggregates and cement paste in the concrete are more closely arranged to fill the internal pores, and the compactness of the concrete is significantly improved. The layered vibration ensures that each layer of concrete from the bottom to the top of the steel pipe 2 is fully vibrated, and the weak area caused by insufficient vibration is avoided. The combined column structure formed in this way is more compact, effectively improves the mechanical properties such as compression resistance, bending resistance, and shear resistance, and can bear greater load. The entire cross section of the steel pipe 2 is filled with concrete and without obvious bubbles, which can ensure that the mechanical properties of the combined column are uniform in the cross section, and when subjected to stress, the load can be uniformly transmitted on the entire cross section to avoid stress concentration caused by local defects or insufficient compaction. This helps to improve the stability and reliability of the combined column under complex stress conditions, and fully plays the synergistic working effect of the steel pipe 2 and the concrete.
[0046] Specifically, the high-performance fiber itself has excellent tensile capacity, and after being integrated into the UHPC slurry 1, it forms a reinforced skeleton at the micro level. When the combined column is subjected to tensile stress, the high-performance fiber bears part of the tensile stress, effectively prevents the initiation and propagation of cracks in the UHPC matrix, and significantly improves the overall tensile strength of the combined column. Therefore, the combined column can better maintain structural integrity when subjected to complex stress such as tension and bending.
[0047] Specifically, the combined column manufactured by the fabricated fire-resistant combined column manufacturing method of the embodiment is particularly suitable for high-rise buildings, bridges and other fields with high requirements for structural performance.
[0048] The principles and implementation modes of the present application are described by specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In summary, the content of the specification should not be understood as a limitation of the present application.
Claims
1. A method for manufacturing an assembled fire-resistant composite column, characterized by: The following steps are involved: S1, make steel pipes according to design dimensions; S2, the UHPC raw materials and PP fibers are fully mixed by a forced mixer to form a UHPC slurry; S3, pour the pre-cut high-performance fiber and the prepared UHPC slurry into the mold and gently vibrate it with a vibrating rod; S4, quickly pouring the UHPC slurry with high-performance fibers into the steel pipe in S1, and using an inserted vibrator to compact it layer by layer; after the pouring is completed, covering both ends of the steel pipe with plastic film for curing to prevent water from evaporating too quickly; S5: After the curing is completed, a fireproof layer is set on the surface of the steel pipe completed in S4.
2. The method for manufacturing an assembled fire-resistant composite column according to claim 1, characterized in that: The fireproof layer is a layer of special fireproof paint with a thickness of about 20 mm or a layer of fireproof board wrapped therein.
3. The method for manufacturing an assembled fire-resistant composite column according to claim 1, characterized in that: The high-performance fiber is glass fiber cloth.
4. The method for manufacturing an assembled fire-resistant composite column according to claim 1, wherein: The raw materials of the UHPC include cement, silica fume, quartz sand and high-efficiency water reducing agent.
5. The method for manufacturing an assembled fire-resistant composite column according to claim 1, characterized in that: In S1, the steel pipe is formed by rolling a steel plate into a circular shape according to a designed size and then welding the rolled steel plate.
6. The method for manufacturing an assembled fire-resistant composite column according to claim 1, characterized in that: In S4, layer-by-layer compaction is performed using an inserted vibrator.
7. The method for manufacturing an assembled fire-resistant composite column according to claim 2, wherein: When the fireproof layer is the fireproof board, the fireproof board is fixed to the steel pipe by a combination of screws.