Fabricated GFRP coral aggregate stainless steel tube concrete composite column and construction method thereof

Abstract

The invention provides an assembly type GFRP coral aggregate stainless steel pipe concrete composite column and a construction method thereof, and relates to the field of assembly type building structures, the composite column comprises an external stainless steel square steel pipe and an internal GFRP pipe, filling cast-in-place interlayer common concrete is arranged between the stainless steel square steel pipe and the internal GFRP pipe, and the GFRP coral aggregate stainless steel pipe concrete composite column is arranged between the external stainless steel square steel pipe and the internal GFRP pipe. Core concrete filled with cast-in-place coral aggregate is arranged in the built-in GFRP pipe, two longitudinal stiffening ribs are symmetrically arranged at the midpoints of the four edges of the section of the stainless steel square steel pipe in the length direction of the vertical section and the width direction of the vertical section respectively, and transverse stiffening ribs are arranged at the four vertexes of the sections of the upper end and the lower end of the stainless steel square steel pipe and the four vertexes of the middle section. The built-in GFRP pipe is arranged in the composite column, so that it is guaranteed that the composite column has enough shear strength and stability in the working process, and a GFRP connecting joint used for connecting the built-in GFRP pipe of the adjacent composite column is arranged over the built-in GFRP pipe. Therefore, the installation and construction difficulty of the fabricated structure can be effectively reduced, the transportation and hoisting cost is saved, and the construction quality is easier to control.

Description

Technical Field

[0001] The invention relates to the field of assembled building structures, and in particular to an assembled GFRP coral aggregate stainless steel tube concrete composite column and a construction method thereof. Background Art

[0002] At present, intelligent construction is becoming a development trend in my country's engineering construction industry. Prefabricated structures can realize industrialized assembly line production, improve construction efficiency and save costs. In addition, the impact on environmental pollution is greatly reduced compared with traditional construction methods. Therefore, it has developed rapidly in recent years. The coarse and fine aggregates used in concrete in the field of building structures in my country are still mainly crushed stone and river sand. However, due to the rapid development of the engineering field in recent decades, the consumption of coarse and fine aggregates as the main components of concrete has increased year by year. The price of river sand has increased by 3.5 times in the past four years, and some areas have experienced a short-term imbalance in the supply and demand of sand and gravel. Therefore, in order to protect the sustainable development of the ecological environment and alleviate the current situation of difficulty in obtaining sand and gravel aggregates and high costs, it is particularly urgent to find alternative coarse and fine aggregates for concrete. Coral reefs refer to the rock and soil bodies formed by the long geological action of the remains of reef-building coral colonies after their death. Coral reefs are developed in the South my country Sea and some coastal areas of the South China Sea. Among them, the islands and reefs of the Nansha Islands are numerous and extensive. Because of their abundant reserves, the rational use of coral materials in the field of engineering construction can alleviate the current problem of sand and gravel shortage and provide new ideas for protecting ecological sustainable development. In addition, coral reefs are used as aggregates in prefabricated engineering structures, and the geographical advantages of their place of origin are utilized. The steel materials in the composite columns are selected from stainless steel materials that are resistant to marine corrosion, and the application scope of prefabricated structures is expanded to marine engineering, which greatly reduces the transportation cost of engineering raw materials, makes construction more efficient, and ensures safety and quality.

[0003] To this end, an assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method were developed, which can effectively reduce the difficulty of installation and construction of the assembled structure, save transportation and hoisting costs, and make the construction quality easier to control. Summary of the invention

[0004] The purpose of the present invention is to provide an assembled GFRP coral aggregate stainless steel tube concrete composite column and a construction method thereof, so as to solve the problem of difficulty in obtaining traditional crushed stone coarse aggregate and river sand fine aggregate for concrete in engineering construction and high cost.

[0005] The present invention provides an assembled GFRP coral aggregate stainless steel tube concrete composite column and a construction method thereof, comprising a composite column including an external stainless steel square steel tube and an internal GFRP tube, a filled cast-in-place interlayer is arranged between the stainless steel square steel tube and the internal GFRP tube, two longitudinal stiffening ribs and longitudinal stiffening ribs are symmetrically arranged at the midpoints of the four sides of the cross section of the stainless steel square steel tube in the vertical cross section length direction and the vertical cross section width direction, transverse stiffening ribs are arranged at the four vertices of the upper and lower end cross sections and the middle cross section of the stainless steel square steel tube to ensure that the composite column has sufficient shear strength and stability when working, and a GFRP connecting joint for connecting the internal GFRP tubes of adjacent layers of composite columns is arranged directly above the internal GFRP tube.

[0006] By adopting the above technical scheme, the built-in GFRP tube in the composite column is filled with prefabricated coral aggregate concrete, and the stainless steel square steel tube and the built-in GFRP tube are filled with cast-in-place sandwich concrete. Through the restraining effect of the built-in GFRP tube and the external stainless steel square steel tube, the mechanical properties of the coral aggregate core concrete and the sandwich ordinary concrete are improved to enhance the bearing capacity of the composite column. By symmetrically arranging four longitudinal stiffening ribs in the stainless steel square steel tube, the overall stiffness and stability of the stainless steel square steel tube are enhanced, and the overall mechanical properties of the composite column are improved. At the same time, it is convenient to fix the built-in GFRP tube. By arranging transverse stiffening ribs at the four vertices of the upper and lower end sections and the middle section of the stainless steel square steel tube, it is ensured that the composite column has sufficient shear strength and stability when working.

[0007] Optionally, the longitudinal stiffening ribs in the stainless steel square steel tube in the composite column extend from the lower end of the composite column to be embedded in the foundation, so that the composite column is effectively anchored to the foundation at its lower end, and the embedded anchoring length is not less than three times the cross-sectional width of the composite column.

[0008] By adopting the above technical solution, four longitudinal stiffening ribs in the bottom layer of composite columns are used to reserve an anchoring length at the bottom and are buried inside the foundation, so that the composite columns are effectively anchored to the lower end foundation.

[0009] Optionally, the longitudinal stiffening ribs are symmetrically provided with two rows of steel bar holes within the exposed length extending above the top of the composite column, which are used to connect steel bars through the beam above the composite column, and the spacing between the holes is greater than 1.5 times the diameter of the steel bar hole, and the distance from the steel bar hole to the edge of the stiffening rib is greater than 1.5 times the diameter of the steel bar hole.

[0010] By adopting the above technical solution, the longitudinal stiffening ribs are symmetrically provided with two rows of steel bar holes within the extended exposed length of the column top section, which can effectively connect the longitudinal force-bearing steel bars of the composite column and the horizontal and vertical beams above it, so that the force of the beam above the composite column is effectively transmitted to the column, enhancing the overall mechanical properties of the structure. At the same time, it provides a guarantee for the positioning accuracy during the installation of the composite column.

[0011] Optionally, the longitudinal stiffening ribs in the stainless steel square steel tube in the composite column are extended to be exposed for a certain length in the column top section at the upper end of the composite column, and the extended exposed length is determined according to the height of the beam above the composite column to achieve effective connection between the horizontal beam and the longitudinal beam above the composite column. The longitudinal stiffening ribs are symmetrically provided with four rows of external hexagonal bolt holes within the extended exposed length range above the top of the composite column.

[0012] By adopting the above technical solution, four rows of hexagonal bolt holes are opened in the longitudinal stiffening ribs within the extended exposed length of the column top section, and the longitudinal stiffening ribs of the upper and lower composite columns of adjacent layers are tightened and fixed by hexagonal bolts to achieve effective connection of the composite columns between adjacent layers, while avoiding the welding connection method with difficult quality control, meeting the requirements of green construction.

[0013] Optionally, the built-in GFRP tube extends outward from the top of the composite column and is connected to the GFRP connecting joint directly above it. The ends of the built-in GFRP tube and the GFRP connecting joint are both provided with sealing rubber rings to prevent the coral aggregate concrete in the GFRP connecting joint from leaking out.

[0014] By adopting the above technical solution, the built-in GFRP tube is extended outward from the top of the composite column and connected to the square GFRP connecting joint above it, and then connected to the built-in GFRP tube in the upper composite column of the adjacent layer through the GFRP connecting joint, so that the coral aggregate core in the GFRP tube of the composite column is concreted to form a whole, thereby improving the integrity of the structure.

[0015] Optionally, transverse stiffening ribs are arranged at the four vertices of the upper and lower end sections and the middle section of the stainless steel square steel in the composite column, and the transverse stiffening ribs are in the shape of an isosceles right triangle.

[0016] By adopting the above technical solution, the transverse stiffening ribs can effectively improve the shear resistance of the composite column, and improve the stiffness and bearing capacity of the composite column.

[0017] Optionally, a stainless steel circular end supporting plate is arranged between the longitudinal stiffening ribs at the bottom end of the composite column, and the stainless steel circular end supporting plate is welded to the longitudinal stiffening ribs and the middle. A U-shaped groove is arranged on the upper surface of the stainless steel circular end supporting plate, and a rubber sealing film is embedded in the groove. The GFRP tube above the stainless steel circular end supporting plate is fixed and positioned by being inserted into the U-shaped groove of the stainless steel circular end supporting plate, and the upper surface of the stainless steel circular end supporting plate is covered with a layer of GFRP cloth.

[0018] With the above technical solution, the GFRP tube above the stainless steel circular end bearing plate is fixed and positioned by being inserted into the U-shaped groove of the stainless steel circular end bearing plate. The upper surface of the stainless steel circular end bearing plate is covered with a layer of 3mm thick GFRP cloth to prevent the GFRP tube coral aggregate concrete above it from directly contacting the stainless steel circular end bearing plate, thereby improving the durability of the composite column.

[0019] Optionally, the vertical axes of the adjacent upper and lower layers of composite columns are kept on the same straight line, and the adjacent upper and lower layers of longitudinal stiffening ribs are overlapped by offsetting the rib plate thickness distance.

[0020] By adopting the above technical solution, the vertical axes of adjacent upper and lower composite columns are kept on the same straight line, which is convenient for positioning during the lifting and installation of the composite columns, and at the same time makes the force distribution of the entire structure more uniform and reasonable after it is completed.

[0021] Another aspect of the present invention provides a construction method for the above-mentioned assembled GFRP coral aggregate stainless steel tube concrete composite column, which comprises the following steps:

[0022] S1: Stainless steel square steel tube forming and prefabrication and installation of other parts and components: According to the design requirements of this application, the stainless steel square steel tubes and other stainless steel product parts and components in the composite column are prefabricated in the stainless steel prefabrication yard, and processed and welded into shape.

[0023] S2: GFRP coral aggregate core concrete prefabrication: GFRP tubes are built into fixed composite columns, core concrete inside the GFRP tubes is poured in the coral aggregate concrete prefabrication yard, and the coral aggregate concrete is cured in the prefabrication yard to the specified strength.

[0024] S3: On-site installation and positioning: The stainless steel square steel pipe filled with coral aggregate core concrete is hoisted to the designated location of the construction site for installation and positioning. The four longitudinal stiffening ribs in the bottom composite column are embedded in the foundation (7) below for anchoring connection. The embedded anchoring length is greater than 3 times the cross-sectional width of the composite column. At the same time, the verticality is checked to meet the construction requirements.

[0025] S4: Installation of GFRP connection joints: After completing S3, roughen the core concrete inside the GFRP tube at the top of the composite column, insert the GFRP connection joint into the GFRP tube that extends upward, tighten and fix it, and then pour coral aggregate concrete of the same strength into the GFRP connection joint.

[0026] S5: Sandwich concrete pouring: After S1 to S4 are completed, ordinary concrete is poured in layers between the outer stainless steel square steel pipe and the inner GFRP pipe, and vibrated to make it dense, and then cured to the designed strength.

[0027] S6: Installation of upper composite columns: Repeat S1 to S2. When the sandwich concrete of the bottom composite column reaches the design strength, install the upper composite column. Align the longitudinal stiffening ribs and downward extensions in the upper composite column with the longitudinal stiffening ribs and upward extensions in the bottom composite column, and tighten the hexagonal bolts to complete the effective connection of the longitudinal stiffening ribs of the adjacent upper and lower composite columns. Pass the longitudinal connecting steel bars of the horizontal beam and the longitudinal beam above the top of the bottom composite column through the fixed longitudinal stiffening rib steel bar holes, and the effective connection between the upper and lower composite columns and the horizontal and longitudinal beams is completed.

[0028] S7: Repeat steps S1 to S6 until the entire structure is completed.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The assembled GFRP coral aggregate stainless steel tube concrete composite column in this application has a high degree of assembly, realizes green industrialized flow production, has a large volume hollow ratio after prefabrication, and has low lifting and installation construction costs.

[0031] 2. The built-in casing of the composite column is made of GFRP glass fiber tube, and the external square steel tube is made of stainless steel with strong corrosion resistance. The scientific combination of materials reduces the construction cost, while giving full play to the corrosion resistance of stainless steel tube on the outer surface of the composite column and better giving play to the lightweight and high-strength performance of GFRP tube, so that the composite column can be applied to various harsh corrosive environments after construction. In addition, the combination of the external stainless steel tube and the built-in GFRP tube significantly enhances the fire resistance of the composite column.

[0032] 3. The raw materials for the coarse and fine aggregates of the core concrete in the composite column are marine coral reefs, which solves the problems of the difficulty in obtaining sand and gravel aggregates for traditional concrete and the high cost. At the same time, it promotes the prefabricated structure to move towards marine engineering, realizes the use of local materials in marine engineering, and reduces transportation costs.

[0033] 4. Simple and efficient connection methods are adopted between the composite columns and the foundation below, the horizontal and vertical beams above, and the composite columns on adjacent floors. The connection construction technology is green and simple, and the quality is safe and reliable, which further improves the efficiency and quality of on-site transportation, installation and construction of prefabricated structures, and promotes the development of green, sustainable and intelligent construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the assembled GFRP coral aggregate stainless steel tube concrete composite column structure.

[0035] Figure 2 It is a prefabricated GFRP coral aggregate stainless steel tube concrete composite column adjacent layer column end diagram.

[0036] Figure 3 This is a schematic diagram of the top of the bottom-level composite column.

[0037] Figure 4 This is a large-scale drawing of the GFRP connection joint.

[0038] Explanation of the reference numerals: 1. Composite column; 2. Stainless steel square steel pipe; 3. Built-in GFRP pipe; 4. GFRP connecting joint; 5. Longitudinal stiffening rib; 7. Foundation; 8. Steel bar hole; 9. Hexagonal bolt hole; 10. Transverse stiffening rib. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field to which the present invention belongs. "Including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0040] The embodiment of the present invention provides an assembled GFRP coral aggregate stainless steel tube concrete composite column and a construction method thereof, comprising a composite column 1 including an external stainless steel square steel tube 2 and a built-in GFRP tube 3, a filled cast-in-place interlayer is arranged between the stainless steel square steel tube 2 and the built-in GFRP tube 3, two longitudinal stiffening ribs 5 and longitudinal stiffening ribs 5 are symmetrically arranged at the midpoints of the four sides of the cross section of the stainless steel square steel tube 2 in the vertical cross section length direction and the vertical cross section width direction, transverse stiffening ribs are arranged at the four vertices of the upper and lower end cross sections and the middle cross section of the stainless steel square steel tube 2 to ensure that the composite column 1 has sufficient shear strength and stability during operation, and a GFRP connecting joint 4 for connecting the built-in GFRP tubes 3 of the adjacent layers of the composite column 1 is arranged directly above the built-in GFRP tube 3.

[0041] See also Figure 1 Figure 2 Figure 3 The built-in GFRP tube 3 in the composite column 1 is filled with prefabricated coral aggregate concrete, and the stainless steel square steel tube 2 and the built-in GFRP tube 3 are filled with cast-in-place sandwich concrete. Through the restraining effect of the built-in GFRP tube 3 and the external stainless steel square steel tube 2, the mechanical properties of the coral aggregate core concrete and the sandwich ordinary concrete are improved to enhance the bearing capacity of the composite column 1. By symmetrically arranging four longitudinal stiffening ribs 5 in the stainless steel square steel tube 2, the overall stiffness and stability of the stainless steel square steel tube 2 are enhanced, the overall mechanical properties of the composite column 1 are improved, and it is convenient to fix the built-in GFRP tube 3. By arranging transverse stiffening ribs at the four vertices of the upper and lower end sections and the middle section of the stainless steel square steel tube 2, it is ensured that the composite column 1 has sufficient shear strength and stability when working.

[0042] In some embodiments, the longitudinal stiffening ribs 5 in the stainless steel square steel tube 2 in the composite column 1 extend from the lower end of the composite column 1 and are embedded in the foundation 7, so that the composite column 1 is effectively anchored to the foundation 7 at its lower end, and the embedded anchoring length is not less than three times the cross-sectional width of the composite column 1.

[0043] In fact, the four longitudinal stiffening ribs 5 in the bottom layer of the composite column 1 are used to reserve an anchoring length at the bottom and are buried inside the foundation 7, so that the composite column 1 and the lower end foundation 7 are effectively anchored.

[0044] In some embodiments, the longitudinal stiffening rib 5 and two rows of steel bar holes 8 are symmetrically opened within the exposed length extending above the top of the composite column 1, which are used to connect steel bars through the beam above the composite column 1, and the spacing between the holes is greater than 1.5 times the diameter of the steel bar hole 8. At the same time, the distance from the steel bar hole 8 to the edge of the stiffening rib is greater than 1.5 times the diameter of the steel bar hole 8.

[0045] See also Figure 4 The longitudinal stiffening rib 5 has two rows of steel bar holes 8 symmetrically arranged in the extended exposed length of the column top section, which can effectively connect the longitudinal force-bearing steel bars of the composite column 1 and the horizontal and vertical beams above it, so that the force of the beam above the composite column 1 is effectively transmitted to the column, thereby enhancing the overall mechanical properties of the structure. At the same time, it provides a guarantee for the positioning accuracy during the installation of the composite column 1.

[0046] In some embodiments, the longitudinal stiffening ribs 5 in the stainless steel square steel tube 2 in the composite column 1 are extended to be exposed for a certain length in the column top section at the upper end of the composite column 1, and the extended exposed length is determined according to the height of the beam above the composite column 1 to achieve effective connection between the cross beam and the longitudinal beam above the composite column 1, and to facilitate the positioning of the GFRP connecting joint 4. The longitudinal stiffening ribs 5 and four rows of external hexagonal bolt holes 9 are symmetrically opened within the extended exposed length range above the column top of the composite column 1. The longitudinal stiffening ribs 5 overlapped at the column ends of adjacent layers of composite columns 1 are fixed by bolts to achieve effective connection between adjacent layers of composite columns 1.

[0047] In fact, the longitudinal stiffening ribs 5 are provided with four rows of hexagonal bolt holes 9 within the extended exposed length range of the column top section, and the longitudinal stiffening ribs 5 of the upper and lower composite columns 1 of adjacent layers are tightened and fixedly connected by hexagonal bolts to realize the effective connection of the composite columns 1 between adjacent layers, while avoiding the welding connection method with difficult quality control, which meets the requirements of green construction.

[0048] In some embodiments, the built-in GFRP tube 3 extends outward from the top of the composite column 1 and is connected to the GFRP connecting joint 4 directly above it. The ends of the built-in GFRP tube 3 and the GFRP connecting joint 4 are both provided with sealing rubber rings to prevent the coral aggregate concrete in the GFRP connecting joint 4 from leaking out.

[0049] In fact, the built-in GFRP tube 3 is extended outward from the top of the composite column 1 and connected to the square GFRP connecting joint 4 thereon, and then connected to the built-in GFRP tube 3 in the composite column 1 of the adjacent layer through the GFRP connecting joint 4, so that the coral aggregate core in the GFRP tube of the composite column 1 is concreted to form a whole, thereby improving the integrity of the structure.

[0050] In some embodiments, transverse stiffening ribs are provided at the four vertices of the upper and lower end sections and the middle section of the stainless steel square steel in the composite column 1, and the transverse stiffening ribs are in the shape of an isosceles right triangle.

[0051] In fact, the transverse stiffening ribs can effectively improve the shear resistance of the composite column 1 and improve the stiffness and bearing capacity of the composite column 1.

[0052] In some embodiments, a stainless steel circular end supporting plate is arranged between the longitudinal stiffening rib 5 at the bottom end of the composite column 1, and the stainless steel circular end supporting plate is welded between the longitudinal stiffening rib 5 and the middle. A U-shaped groove is arranged on the upper surface of the stainless steel circular end supporting plate, and a rubber sealing film is embedded in the groove. The GFRP tube above the stainless steel circular end supporting plate is fixed and positioned by being inserted into the U-shaped groove of the stainless steel circular end supporting plate, and the upper surface of the stainless steel circular end supporting plate is covered with a layer of GFRP cloth.

[0053] In fact, the GFRP pipe above the stainless steel round end bearing plate is fixed and positioned by being inserted into the U-shaped groove of the stainless steel round end bearing plate. The upper surface of the stainless steel round end bearing plate is covered with a layer of 3mm thick GFRP cloth to prevent the GFRP pipe coral aggregate concrete above it from directly contacting the stainless steel round end bearing plate, thereby improving the durability of the composite column 1.

[0054] In some embodiments, the vertical axes of the adjacent upper and lower layers of composite columns 1 are maintained on the same straight line, and the adjacent upper and lower layers of longitudinal stiffening ribs 5 are overlapped by offsetting the rib plate thickness distance.

[0055] In fact, keeping the vertical axes of adjacent upper and lower composite columns 1 on the same straight line facilitates the positioning of the composite columns 1 during lifting and installation construction, and at the same time makes the force distribution of the entire structure more uniform and reasonable after it is completed.

[0056] On the other hand, the present invention also provides a construction method of the above-mentioned assembled GFRP coral aggregate stainless steel tube concrete composite column 1, which comprises the following steps:

[0057] S1: Forming of the stainless steel square steel tube 2 and prefabrication and installation of other parts and components: According to the design requirements of this application, the stainless steel square steel tube 2 and other stainless steel product parts and components in the composite column 1 are prefabricated in a stainless steel prefabrication yard, and processed and welded into shape.

[0058] S2: GFRP coral aggregate core concrete prefabrication: GFRP tube 3 is built into the fixed composite column 1, the core concrete in the GFRP tube is poured in the coral aggregate concrete prefabrication yard, and the coral aggregate concrete is cured in the prefabrication yard to the specified strength.

[0059] S3: On-site installation and positioning: The stainless steel square steel pipe 2 filled with coral aggregate core concrete is hoisted to the designated location of the construction site for installation and positioning. The four longitudinal stiffening ribs 5 in the bottom composite column 1 are embedded in the foundation 7 (7) below for anchoring connection. The embedded anchoring length is greater than 3 times the cross-sectional width of the composite column 1. At the same time, the verticality is checked to meet the construction requirements.

[0060] S4: Installation of GFRP connection joint 4: After completing S3, roughen the core concrete inside the GFRP tube at the top of the composite column 1, insert the GFRP connection joint 4 into the GFRP tube extending upward, tighten and fix it, and then pour coral aggregate concrete of the same strength into the GFRP connection joint 4.

[0061] S5: Sandwich concrete pouring: After S1 to S4 are completed, ordinary concrete is poured in layers between the outer stainless steel square steel pipe 2 and the inner GFRP pipe 3, and vibrated to make it dense, and then cured to the designed strength.

[0062] S6: Installation of upper composite column 1: Repeat S1 to S2. When the interlayer concrete of the bottom composite column 1 reaches the design strength, install the upper composite column 1. Align the longitudinal stiffening ribs 5 and the downward protruding part in the upper composite column 1 with the longitudinal stiffening ribs 5 and the upward protruding part in the bottom composite column 1, and tighten the hexagonal bolts to complete the effective connection of the longitudinal stiffening ribs 5 and the adjacent upper and lower composite columns 1. Pass the longitudinal connecting steel bars of the horizontal beam and the longitudinal beam above the top of the bottom composite column 1 through the fixed longitudinal stiffening rib 5 steel bar holes 8, and the effective connection between the upper and lower composite columns 1 and the horizontal and longitudinal beams is completed.

[0063] S7: Repeat steps S1 to S6 until the entire structure is completed.

[0064] In fact, the stainless steel material types used for the stainless steel square steel tube 2, the longitudinal stiffening ribs, the transverse stiffening ribs and the stainless steel circular end bearing plate in the step S1 are all S31603 with strong corrosion resistance, and the thickness is 16 mm. The hexagonal bolts used to fix the adjacent upper and lower longitudinal stiffening ribs in the step S6 are SUS316 hexagonal bolts with models of M10, M12 and M14.

[0065] In fact, the cement used to mix the coral aggregate core concrete in the step S2 is P.II52.5 silicate cement; the coral reefs are from the South China Sea coast, which is rich in production in my country. The coral reef rocks are crushed by a compound crusher to obtain 10-15mm continuously graded coral gravel coarse aggregate, and the fine aggregate coral sand has a particle size of 0.05-4.75mm. In order to improve the performance of coral aggregate concrete, a high-efficiency water reducer naphthalenesulfonic acid formaldehyde condensate is added to the concrete, and the water reduction efficiency is as high as 30%. In addition, in order to enhance the workability and durability of concrete, an appropriate amount of mineral powder is added during the pouring process. The water reduction efficiency of the water reducer is calculated as 30%, and the amount is 0.05% of the total cement dosage. The concrete slump is 20mm-60mm as the control index, the sand ratio is 0.6, the amount of mineral powder added is 20% of the cement dosage, and the mass of each cubic meter of coral aggregate core concrete is calculated as 2000kg.

[0066] In fact, in the S5 step, the ordinary concrete of the interlayer is cast on the construction site, the mixed cement is P.II42.5 silicate cement, the water reducer is a high-efficiency water reducer naphthalenesulfonic acid formaldehyde condensate, the water reducing efficiency of the water reducer is 30%, the amount is 0.05% of the total cement amount, the slump of concrete is 30mm-70mm as the control index, the sand ratio is 0.4, the amount of mineral powder added is 20% of the cement amount, and the mass of each cubic meter of interlayer concrete is calculated as 2350-2450kg.

[0067] In some embodiments, the coral aggregate core concrete and the interlayer ordinary concrete in the composite column 1 are designed in a manner that is compatible with high-strength core concrete and high-strength interlayer concrete. The mixing ratios of C30-C50 coral aggregate core concrete and C30-C50 interlayer ordinary concrete are shown in the following table.

[0068]

[0069] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. An assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method, characterized in that: The composite column comprises an external stainless steel square steel tube and an internal GFRP tube, wherein cast-in-situ interlayer ordinary concrete is arranged between the stainless steel square steel tube and the internal GFRP tube, and cast-in-situ coral aggregate core concrete is arranged inside the internal GFRP tube, two longitudinal stiffening ribs are symmetrically arranged at the midpoints of the four sides of the cross section of the stainless steel square steel tube in the vertical cross section length direction and the vertical cross section width direction, and transverse stiffening ribs are arranged at the four vertices of the upper and lower end cross sections and the middle cross section of the stainless steel square steel tube to ensure that the composite column has sufficient shear strength and stability when working, and a GFRP connecting joint for connecting the internal GFRP tubes of adjacent layers of composite columns is arranged directly above the internal GFRP tube.

2. The assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method according to claim 1, characterized in that: The longitudinal stiffening ribs in the stainless steel square steel tube in the composite column extend from the lower end of the composite column to be embedded in the foundation, so that the composite column is effectively anchored to the foundation at its lower end, and the embedded anchoring length is not less than three times the cross-sectional width of the composite column.

3. The assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method according to claim 2, characterized in that: The longitudinal stiffening ribs are symmetrically provided with two rows of steel bar holes within the exposed length extending above the top of the composite column, which are used to connect steel bars through the beam above the composite column, and the spacing between the holes is greater than 1.5 times the diameter of the steel bar hole. At the same time, the distance from the steel bar hole to the edge of the stiffening rib is greater than 1.5 times the diameter of the steel bar hole.

4. The assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method according to claim 3, characterized in that: The longitudinal stiffening ribs in the stainless steel square steel tube in the composite column are extended and exposed for a certain length in the cross section of the column top at the upper end of the composite column. The extended exposed length is determined according to the height of the beam above the composite column to achieve effective connection between the horizontal beam and the longitudinal beam above the composite column. The longitudinal stiffening ribs are symmetrically provided with four rows of external hexagonal bolt holes within the extended exposed length range above the top of the composite column.

5. The assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method according to claim 4, characterized in that: The built-in GFRP pipe is higher than the top of the composite column and extends outward to be connected to the GFRP connecting joint directly above it. The ends of the built-in GFRP pipe and the GFRP connecting joint are both provided with sealing rubber rings to prevent the coral aggregate concrete in the GFRP connecting joint from leaking out.

6. The assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method according to claim 5, characterized in that: Transverse stiffening ribs are arranged at the four vertices of the upper and lower end sections and the middle section of the stainless steel square steel in the composite column, and the shape of the transverse stiffening ribs is an isosceles right triangle.

7. The assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method according to claim 6, characterized in that: A stainless steel circular end plate is arranged between the longitudinal stiffening ribs at the bottom end of the composite column, and the stainless steel circular end plate is welded to the longitudinal stiffening ribs and the middle. A U-shaped groove is arranged on the upper surface of the stainless steel circular end plate, and a rubber sealing film is embedded in the groove. The GFRP pipe above the stainless steel circular end plate is fixed and positioned by being inserted into the U-shaped groove of the stainless steel circular end plate, and the upper surface of the stainless steel circular end plate is covered with a layer of GFRP cloth.

8. The assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method according to claim 7, characterized in that: The vertical axes of the adjacent upper and lower layers of composite columns are kept on the same straight line, and the adjacent upper and lower layers of longitudinal stiffening ribs are overlapped by offsetting the rib plate thickness distance.

9. The assembled GFRP coral aggregate stainless steel tube concrete composite column and its construction method according to claim 8, characterized in that: The steps include: S1: Stainless steel square steel tube forming and prefabrication and installation of other parts and components: According to the design requirements of this application, the stainless steel square steel tubes and other stainless steel product parts and components in the composite column are prefabricated in the stainless steel prefabrication yard, and processed and welded into shape. S2: GFRP coral aggregate core concrete prefabrication: GFRP tubes are built into fixed composite columns, core concrete inside the GFRP tubes is poured in the coral aggregate concrete prefabrication yard, and the coral aggregate concrete is cured in the prefabrication yard to the specified strength. S3: On-site installation and positioning: The stainless steel square steel pipe filled with coral aggregate core concrete is hoisted to the designated location of the construction site for installation and positioning. The four longitudinal stiffening ribs in the bottom composite column are embedded in the foundation (7) below for anchoring connection. The embedded anchoring length is greater than 3 times the cross-sectional width of the composite column. At the same time, the verticality is checked to meet the construction requirements. S4: Installation of GFRP connection joints: After completing S3, roughen the core concrete inside the GFRP tube at the top of the composite column, insert the GFRP connection joint into the GFRP tube that extends upward, tighten and fix it, and then pour coral aggregate concrete of the same strength into the GFRP connection joint. S5: Sandwich concrete pouring: After S1 to S4 are completed, ordinary concrete is poured in layers between the outer stainless steel square steel pipe and the inner GFRP pipe, and vibrated to make it dense, and then cured to the designed strength. S6: Installation of upper composite columns: Repeat S1 to S2. When the sandwich concrete of the bottom composite column reaches the design strength, install the upper composite column. Align the longitudinal stiffening ribs and downward extensions in the upper composite column with the longitudinal stiffening ribs and upward extensions in the bottom composite column, and tighten the hexagonal bolts to complete the effective connection of the longitudinal stiffening ribs of the adjacent upper and lower composite columns. Pass the longitudinal connecting steel bars of the horizontal beam and the longitudinal beam above the top of the bottom composite column through the fixed longitudinal stiffening rib steel bar holes, and the effective connection between the upper and lower composite columns and the horizontal and longitudinal beams is completed. S7: Repeat steps S1 to S6 until the entire structure is completed.

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