A method of fiber-reinforcing a steel pipe concrete column

Abstract

The application belongs to the technical field of building components, and provides a fiber reinforcing method for a steel pipe concrete column, which comprises the following steps: S1, vertically fixing an outer steel pipe to a construction position, and then hoisting an inner fiber composite pipe into the outer steel pipe; S2, pouring concrete into a gap between the outer steel pipe and the inner fiber composite pipe to form an outer concrete layer; S3, hoisting a plurality of segmental stones into the inner fiber composite pipe from bottom to top in sequence and fixing the segmental stones by means of a cross-shaped hoop; and S4, pouring concrete between the inner fiber composite pipe and the segmental stones to a height level with the segmental stone located at the top to form an inner concrete layer. The application improves the bearing capacity and deformation performance of a traditional steel pipe concrete column by using a fiber composite material.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building components, and particularly relates to a fiber reinforcing method for a steel pipe concrete column. BACKGROUND

[0002] The steel pipe concrete column has the advantages of high strength, large cross-section bending stiffness, corrosion resistance, good fire resistance, etc. The axial compression strength of the steel pipe concrete column is mainly provided by the restrained concrete and the external steel pipe. For a common steel pipe concrete composite column, the compression resistance and bearing capacity provided by the concrete are usually insufficient to meet the requirements of high-strength structures. Moreover, the common steel pipe concrete is prone to buckling under the action of axial compression, which affects the overall structural performance.

[0003] The application of fiber reinforced composite materials has been proved to effectively make up for the deficiencies of the steel pipe concrete column by combining the fiber reinforced composite materials with the steel pipe. Meanwhile, in many regions of China, the reserves of stone materials are abundant, and the processing industry is developed. The utilization of stone materials in the steel pipe concrete column can not only solve the problems of the steel pipe concrete column, but also reduce the amount of concrete used in newly built structures. SUMMARY

[0004] The purpose of the application is to provide a fiber reinforcing method for a steel pipe concrete column to solve the above problems and achieve the purpose of using fiber composite materials to make up for the defects of the traditional steel pipe concrete column, such as insufficient compression resistance and bearing capacity and easy buckling.

[0005] To achieve the above purpose, the application provides the following scheme: a fiber reinforcing method for a steel pipe concrete column, the operation steps of which include:

[0006] S1, after vertically fixing the outer steel pipe to the construction position, hoisting the inner fiber composite pipe into the outer steel pipe and fixing the position of the inner fiber composite pipe;

[0007] S2, pouring concrete into the gap between the outer steel pipe and the inner fiber composite pipe to the level of the height of the inner fiber composite pipe, and once-forming to form an outer concrete layer;

[0008] S3, hoisting and fixing a plurality of segmental stone materials into the inner fiber composite pipe from bottom to top;

[0009] S4, pouring concrete into the gap between the inner fiber composite pipe and the segmental stone materials to the level of the height of the segmental stone material located at the top to form an inner concrete layer.

[0010] Preferably, after hoisting the segmental stone material into the inner fiber composite pipe in the step S3, the segmental stone material is positioned and fixed by using a cross-shaped hoop, and then the concrete is once-formed.

[0011] Preferably, in the steps S2 and S3, steel fibers are mixed into the poured concrete.

[0012] Preferably, the volume fraction of the steel fiber concrete formed after the incorporation of the steel fiber in the step S2 and step S3 is controlled in the range of 0.5% to 2%.

[0013] Preferably, in the step S2, the inner fiber composite pipe comprises an inner steel pipe, an outer fiber layer is fixedly sleeved on the outer sidewall of the inner steel pipe, and a prefabricated concrete layer is arranged on the inner sidewall of the inner steel pipe, and an inner fiber layer is arranged on the inner side of the prefabricated concrete layer.

[0014] Preferably, in the step S2, the prefabrication method of the inner fiber composite pipe comprises:

[0015] manufacturing an inner steel pipe;

[0016] filling the inner steel pipe with a required amount of concrete, and rotating the inner steel pipe at a high speed around an axis to make the concrete adhere to the inner wall of the inner steel pipe to form a prefabricated concrete layer;

[0017] winding a fiber material on the outer surface of the inner steel pipe to form an outer fiber layer;

[0018] manufacturing a columnar mold, winding a fiber on the surface of the columnar mold, and forming a fiber pipe after demolding, and inserting the fiber pipe into the prefabricated concrete layer to form an inner fiber layer.

[0019] Preferably, in the step S2, the thickness of the outer fiber layer and the inner fiber layer on the inner fiber composite pipe is not less than 20mm.

[0020] Preferably, in the step S2, the thickness of the prefabricated concrete layer on the inner fiber composite pipe is not greater than 30mm.

[0021] Preferably, the material of the outer fiber layer and the inner fiber layer is one or more of carbon fiber, basalt fiber, glass fiber, aramid fiber and hybrid fiber.

[0022] Preferably, the wall surface of the segmental stone in the step S3 can be subjected to a roughening treatment in advance to enhance the connection strength between the segmental stone and the inner concrete layer.

[0023] Compared with the prior art, the present application has the following advantages and technical effects:

[0024] 1. By arranging the inner fiber composite pipe in the outer steel pipe, the compressive capacity of the core of the steel pipe concrete column is improved through the fiber composite layer, thereby improving the overall bearing capacity.

[0025] 2. By filling the segmental stone in the inner fiber composite pipe, the bearing capacity of the concrete column can be effectively enhanced, and the amount of concrete can be reduced to achieve carbon reduction and emission reduction.

[0026] 3. The inner fiber composite tube is prefabricated in a factory and can be quickly put into use at a construction site, which can enhance the performance of the steel pipe concrete column and produce better economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0028] Figure 1 is a sectional view of the steel pipe concrete column of the present application;

[0029] Figure 2 is a top view of the steel pipe concrete column of the present application;

[0030] Figure 3 is a structural schematic diagram of the inner fiber composite tube of the present application;

[0031] Figure 4 is a schematic diagram of the segmental stone chiseling position of the present application;

[0032] Figure 5 is a schematic diagram of the extension end of the second embodiment of the present application;

[0033] Figure 6 is a schematic diagram of the pouring port of the third embodiment of the present application;

[0034] Wherein, 1, outer steel pipe; 2, inner fiber composite tube; 3, segmental stone; 4, outer concrete layer; 5, inner concrete layer; 6, inner steel pipe; 7, outer fiber layer; 8, inner fiber layer; 9, chiseling surface; 10, prefabricated concrete layer; 11, extension end; 12, pouring port; 13, cross-shaped hoop. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] In order to make the above-mentioned purposes, features 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.

[0037] Embodiment one:

[0038] Reference Figures 1-4The application provides a fiber-reinforced method of a steel pipe concrete column, and the operation steps comprise the following steps:

[0039] S1, after fixing the outer steel pipe 1 vertically to a construction position, hoisting the inner fiber composite pipe 2 into the outer steel pipe 1 and fixing the position of the inner fiber composite pipe 2;

[0040] As shown in Figure 1 and Figure 2 , the horizontal section of the outer steel pipe 1 is arranged as a rectangle, and the horizontal section of the inner fiber composite pipe 2 is arranged as a circle. When hoisting the inner fiber composite pipe 2 into the outer steel pipe 1, the axis of the inner fiber composite pipe 2 needs to be coincided with the central axis of the outer steel pipe 1 to achieve the most uniform stress position.

[0041] S2, pouring concrete into the gap between the outer steel pipe 1 and the inner fiber composite pipe 2 to the height of the inner fiber composite pipe 2, and once pouring to form an outer concrete layer 4;

[0042] As shown in Figure 1 , when pouring the concrete between the outer steel pipe 1 and the inner fiber composite pipe 2, the concrete needs to be vibrated, and the vibration is performed once every 150mm of pouring depth. The bubbles and gaps in the concrete can be removed through the vibration, so that the concrete is more compact, meanwhile, the vibration can prevent the segregation of the concrete, so that the components in the concrete are more evenly distributed, and the strength and durability of the concrete can be improved, the aggregate in the concrete is more compact, the porosity of the concrete is reduced, and the strength and durability are improved.

[0043] S3, hoisting and fixing a plurality of segmental stones 3 into the inner fiber composite pipe 2 from bottom to top;

[0044] As shown in Figure 1 , in order to ensure the stable contact between the adjacent segmental stones 3, the two ends of the segmental stone 3 need to be processed flat. After placing and fixing the first segmental stone 3 into the inner fiber composite pipe 2, hoisting another segmental stone 3 into the inner fiber composite pipe 2, and standing on the top of the previous segmental stone 3 and fixing it. The segmental stones 3 are stacked in the inner fiber composite pipe 2 according to the above method.

[0045] As shown in Figure 1 , the central axes of the plurality of segmental stones 3 need to be coincided with the axis of the inner fiber composite pipe 2 to ensure the stability of the whole steel pipe concrete column.

[0046] S4, pouring concrete between the inner fiber composite pipe 2 and the segmental stones 3 to the height of the segmental stone 3 at the top to form an inner concrete layer 5;

[0047] The concrete is poured along the inner wall of the inner fiber composite pipe 2, so that the concrete fills the gap between the segmental stone 3 and the inner fiber composite pipe 2. During the pouring of the concrete, vibration is required, and vibration is performed once every 150 mm of pouring depth. The vibration of the concrete not only enhances the strength and durability of the concrete, but also enables better bonding between the concrete and the segmental stone 3, thereby enhancing the bonding strength between the concrete and the surface of the segmental stone 3. Before the concrete is poured to the top of the segmental stone 3, the central axis of the segmental stone 3 needs to be kept coincident with the axis of the inner fiber composite pipe 2.

[0048] Further optimization, in step S3, after the segmental stone 3 is hoisted into the inner fiber composite pipe 2, the segmental stone 3 is positioned and fixed by using the cross-shaped hoop 13, and then the concrete is poured in one time to form.

[0049] After the first segmental stone 3 is inserted into the inner fiber composite pipe 2 at a predetermined position, the segmental stone 3 is stabilized by using the cross-shaped hoop 13, thereby playing a role of positioning and stabilizing the segmental stone 3, and avoiding the deviation of the subsequent segmental stones 3 due to the deviation of the first segmental stone 3.

[0050] Further optimization, in the subsequent stacking construction process of the segmental stone 3, the segmental stone 3 is positioned and stabilized by using the cross-shaped hoop 13 before the concrete is poured in one time, thereby ensuring that there is no deviation in the stacking of the segmental stones 3 after the construction of the steel pipe concrete column is completed.

[0051] Further optimization, in steps S2 and S3, steel fibers are mixed into the poured concrete.

[0052] Further optimization, after the steel fibers are mixed into the concrete in steps S2 and S3, the mixing amount of the fiber concrete formed, i.e., the volume rate, is controlled to be 0.5% to 2%.

[0053] The mixing of the steel fibers into the concrete can improve the tensile, bending, impact and fatigue resistance of the concrete, and improve the bearing capacity of the steel pipe concrete column. After the steel fibers are mixed in, the mixing amount of the fiber concrete formed, i.e., the volume rate, is controlled to be 0.5% to 2%. This can not only improve the performance of the concrete, but also maintain the flowability of the concrete, maintain the pumpability of the concrete, and avoid the poor flowability of the concrete caused by too much mixing of the steel fibers, thereby avoiding the difficulty in construction.

[0054] Further optimization, in step S2, the inner fiber composite pipe 2 includes an inner steel pipe 6, an outer fiber layer 7 is fixedly sleeved on the outer side wall of the inner steel pipe 6, a prefabricated concrete layer 10 is arranged on the inner side wall of the inner steel pipe 6, and an inner fiber layer 8 is arranged on the inner side of the prefabricated concrete layer 10.

[0055] Further optimization scheme, in step S2, the prefabrication method of the inner fiber composite pipe 2 includes:

[0056] Making the inner steel pipe 6;

[0057] The inner steel pipe 6 is made by hot bending of steel plate and seamless welding technology to ensure that the strength of the inner steel pipe 6 meets the use requirements.

[0058] Pouring the required amount of concrete into the inner steel pipe 6, and rotating the inner steel pipe 6 at high speed around the axis, so that the concrete adheres to the inner wall of the inner steel pipe 6 to form a prefabricated concrete layer 10;

[0059] The inner steel pipe 6 is placed horizontally on the centrifuge, and the inner steel pipe 6 is rotated at high speed by the centrifuge, and the concrete is sprayed onto the inner wall of the inner steel pipe 6. The poured concrete will rotate with the inner steel pipe 6 after contacting the inner wall of the inner steel pipe 6. Under the action of centrifugal force, the concrete is evenly spread on the inner wall of the inner steel pipe 6 to form a prefabricated concrete layer 10. When the thickness of the prefabricated concrete layer 10 reaches the set thickness, the pouring of the concrete is stopped.

[0060] In order to ensure the firm combination between the concrete and the inner steel pipe 6, the concrete is selected from UHPC concrete or ECC concrete.

[0061] Winding a fiber material on the outer surface of the inner steel pipe 6 to form an outer fiber layer 7;

[0062] The outer fiber layer 7 is adhered and wound on the outer side wall of the inner steel pipe 6 by mechanical connection fiber winding process. The winding direction of the continuous fibers in the outer fiber layer 7 is circumferential or close to circumferential, so that the cross-sectional shape of the outer fiber layer 7 is consistent with the cross-sectional shape of the inner steel pipe 6.

[0063] Making a columnar mold, winding a fiber on the surface of the columnar mold, and forming a fiber pipe after demolding, and inserting the fiber pipe into the prefabricated concrete layer 10 to form an inner fiber layer 8.

[0064] According to the set inner diameter of the prefabricated concrete layer 10, a columnar mold with a suitable outer diameter is made, which is adhered and wound on the outer side wall of the columnar mold by mechanical connection fiber winding process. The winding direction of the continuous fibers in the inner fiber layer 8 is circumferential or close to circumferential, so that the cross-sectional shape of the inner fiber layer 8 is also consistent with the cross-sectional shape of the inner steel pipe 6. The winding of the fiber to the outer diameter of the inner fiber layer 8 is stopped when the outer diameter of the inner fiber layer 8 is the same as the inner diameter of the prefabricated concrete layer 10. Then, the inner fiber layer 8 is demolded from the columnar mold, and the inner fiber layer 8 is sleeved into the prefabricated concrete layer 10 to form an inner fiber composite pipe 2.

[0065] The inner fiber composite pipe 2 is maintained until the prefabricated concrete layer 10 reaches the use standard, at which time the prefabricated inner fiber composite pipe 2 is completed.

[0066] Further optimization scheme, in step S2, the thickness of the outer fiber layer 7 and the inner fiber layer 8 on the inner fiber composite tube 2 is not less than 20mm.

[0067] The inner fiber layer 8 and the outer fiber layer 7 can play a circumferential restraint effect on the inner steel tube 6 and the precast concrete layer 10, so that the concrete is in a three-dimensional compression state, which can greatly improve its compressive strength.

[0068] Further optimization scheme, in step S2, the thickness of the precast concrete layer 10 on the inner fiber composite tube 2 is not greater than 30mm.

[0069] By setting the precast concrete layer 10 with a thickness of not more than 30mm, the construction difficulty of the precast concrete layer 10 can be reduced, and the adhesion of the concrete layer to the inner wall of the steel tube is ensured. At the same time, due to the difference in surface properties between fiber and steel, the adhesion is weak, and by pasting the inner fiber layer 8 with the precast concrete layer 10, the stability of the inner fiber layer 8 on the inner side of the inner steel tube 6 can be improved.

[0070] Further optimization scheme, the material of the outer fiber layer 7 and the inner fiber layer 8 is one or more of carbon fiber, basalt fiber, glass fiber, aramid fiber and hybrid fiber.

[0071] Further optimization scheme, the wall surface of the segmental stone 3 in step S3 can be chiseled in advance to enhance the connection strength between the segmental stone 3 and the inner concrete layer 5.

[0072] The outer wall of the segmental stone 3 is chiseled to make the surface rough, and after pouring concrete, the friction between the concrete and the segmental stone 3 will increase, which can effectively improve the connection strength between the segmental stone 3 and the inner concrete layer 5, and further improve the overall bearing performance of the steel pipe concrete column.

[0073] As shown in Figure 4 To avoid the strength impact of chiseling on the segmental stone 3, and reduce the construction amount, a plurality of chiseled surfaces 9 can be pre-set on the surface of the segmental stone 3, that is, the area of the chiseled surface 9 is chiseled, which can also improve the connection strength between the segmental stone 3 and the inner concrete layer 5.

[0074] Example two:

[0075] The difference between this embodiment and example one is that the two ends of the inner steel tube 6 extend beyond the two ends of the outer fiber layer 7 and the inner fiber layer 8 to form an extended end 11, and the length of the extended end 11 at both ends of the inner steel tube 6 is between 15mm and 20mm.

[0076] As shown in Figure 5As shown, in the second stage of prefabricating the inner fiber composite pipe, when the outer fiber layer 7 is wrapped around the outer surface of the inner steel pipe 6, it is necessary to ensure that the two ends of the inner steel pipe 6 have a distance of 15mm to 20mm without continuous fiber wrapping, so as to ensure that after the outer fiber layer 7 is made, both ends of the inner steel pipe 6 are in the state of extending out of the outer fiber layer 7.

[0077] When laying the precast concrete layer 10, it is necessary to ensure that there is no concrete within 15mm to 20mm of both ends of the inner steel pipe 6, and to ensure that after the precast concrete layer 10 is laid, the inner side of the inner steel pipe 6 is exposed within 15mm to 20mm of both ends.

[0078] When making the inner fiber layer 8, it is necessary to ensure that the length of the inner fiber layer 8 is less than the length of the inner steel pipe 6, and to ensure that after the inner fiber layer 8 is inserted into the precast concrete layer 10, there is a gap of 15mm to 20mm between the two ends of the inner fiber layer 8 and the two ends of the inner steel pipe 6.

[0079] With the above restrictions, both ends of the inner fiber composite tube 2 can have exposed protruding ends 11 of 15mm to 20mm. During the construction of the steel pipe concrete column, if it is necessary to weld another inner fiber composite tube 2 onto the inner fiber composite tube 2, the exposed part and the protruding ends 11 can be easily welded.

[0080] To further optimize the design and ensure the load-bearing capacity of the final steel-concrete composite column, continuous fibers can be manually wrapped around the protruding end 11 of the welded connection on-site until they are the same thickness as the outer fiber layer 7, thereby enhancing the load-bearing capacity of the weld.

[0081] Example 3:

[0082] The only difference between this embodiment and embodiment two is that an injection port 12 is provided on one of the extended ends 11 of the inner fiber composite tube 2, and the injection port 12 is connected to the inner side of the inner fiber composite tube 2.

[0083] like Figure 6 As shown, when the inner fiber composite pipe 2 is hoisted into the outer steel pipe 1, it is necessary to ensure that the injection port 12 is at the bottom.

[0084] Different from the pouring method of the first embodiment, the gap between the segmental stone 3 and the inner fiber composite pipe 2 is first poured with concrete to form the inner concrete layer 5, and then the gap between the inner fiber composite pipe 2 and the outer steel pipe 1 is poured with concrete to form the outer concrete layer 4. Specifically, when pouring the concrete into the gap between the segmental stone 3 and the inner fiber composite pipe 2, the concrete pouring pipe can be first connected with the pouring port 12, and then the inner fiber composite pipe 2 is hoisted into the outer steel pipe 1, and the concrete pouring pipe is located in the gap between the outer steel pipe 1 and the inner fiber composite pipe 2. The pouring of the concrete is performed from bottom to top through the pouring port 12. The pouring of the concrete from bottom to top can make the concrete filling more compact. After the inner concrete layer 5 is filled, the pouring pipe is pulled out, and then the concrete is poured into the gap between the outer steel pipe 1 and the inner fiber composite pipe 2 to form the outer concrete layer 4.

[0085] Embodiment four:

[0086] The difference between this embodiment and the first embodiment is that the prefabrication method of the inner fiber composite pipe 2 comprises:

[0087] The inner steel pipe 6 is made by hot bending a steel plate and then using seamless welding technology to ensure that the strength of the inner steel pipe 6 meets the use requirements.

[0088] The inner steel pipe 6 is made by hot bending a steel plate and then using seamless welding technology to ensure that the strength of the inner steel pipe 6 meets the use requirements.

[0089] The outer fiber layer 7 is formed by winding a fiber material on the outer surface of the inner steel pipe 6.

[0090] The outer fiber layer 7 is adhered and wound on the outer side wall of the inner steel pipe 6 by the mechanical connection fiber winding process, and the winding direction of the continuous fibers in the outer fiber layer 7 is circumferential or close to circumferential, so that the cross-sectional shape of the outer fiber layer 7 is consistent with the cross-sectional shape of the inner steel pipe 6.

[0091] The columnar mold is made, and the fiber pipe is formed by winding a fiber on the surface of the columnar mold after demolding.

[0092] According to the set inner diameter of the prefabricated concrete layer 10, a columnar mold with a suitable outer diameter is made, and the outer side wall of the columnar mold is adhered and wound by the mechanical connection fiber winding process. The winding direction of the continuous fibers in the inner fiber layer 8 is circumferential or close to circumferential, so that the cross-sectional shape of the inner fiber layer 8 is also consistent with the cross-sectional shape of the inner steel pipe 6. The winding of the fiber is stopped when the outer diameter of the inner fiber layer 8 is the same as the set inner diameter of the prefabricated concrete layer 10. Then, the inner fiber layer 8 is demolded from the columnar mold to form the fiber pipe.

[0093] The inner steel pipe 6 is vertically placed, the fiber pipe is hoisted into the inner steel pipe 6, and the concrete is poured into the gap between the inner steel pipe 6 and the fiber pipe to form the inner fiber layer 8, and thus the prefabrication of the inner fiber composite pipe 2 is completed.

[0094] The inner steel pipe 6 is fixed vertically to the ground, and to ensure that the bottom of the inner steel pipe 6 has the structure of the protruding end 11, the bottom of the inner steel pipe 6 can be inserted into the ground by 15-20 mm deep, or a disc with the same inner diameter as the inner steel pipe 6 can be placed at the bottom of the inner steel pipe 6, which is 15-20 mm high, so that when the concrete is poured, the concrete will not contact the 15-20 mm high position at the bottom of the inner steel pipe 6, and at the same time, it can also ensure that the fiber pipe will not coincide with the 15-20 mm high position at the bottom of the inner steel pipe 6 when it is inserted to the bottom, so as to ensure the reservation of the structure of the bottom protruding end 11.

[0095] When the limiting pipe falls into the inner steel pipe 6, it needs to ensure that its axis coincides with the axis of the inner steel pipe 6, and at the same time, when the concrete is poured, it needs to be vibrated, and it is vibrated once every 150 mm of pouring height. Since the length of the limiting pipe is less than the length of the inner steel pipe 6, when it is poured to the same height as the fiber pipe, the pouring is stopped, at this time, the top of the inner steel pipe 6 can reserve the protruding end 11.

[0096] After the concrete pouring is completed, the concrete is cured. After the curing is completed, the poured concrete forms a prefabricated concrete layer, the fiber pipe forms an inner fiber layer 8, and the inner fiber composite pipe 2 is prefabricated.

[0097] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0098] The above-described embodiments are only descriptions of the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A method of fiber-reinforcing a concrete-filled steel tubular column, characterized by, The operation steps comprise: S1, after fixing the outer steel pipe (1) vertically to the construction position, hoist the inner fiber composite pipe (2) into the outer steel pipe (1), and fix the position of the inner fiber composite pipe (2); S2, pour the concrete into the gap between the outer steel pipe (1) and the inner fiber composite pipe (2) to the level of the inner fiber composite pipe (2), and once cast to form the outer concrete layer (4); S3, hoist and fix the segmental stone (3) into the inner fiber composite pipe (2) from bottom to top; S4, pour the concrete between the inner fiber composite pipe (2) and the segmental stone (3) to the level of the segmental stone (3) at the top to form the inner concrete layer (5); In the step S3, after hoisting the segmental stone (3) into the inner fiber composite pipe (2), use the cross-shaped hoop (13) to fix the segmental stone (3), and then pour the concrete to form; In the step S2, the inner fiber composite pipe (2) comprises an inner steel pipe (6), an outer fiber layer (7) is fixedly sleeved on the outer side wall of the inner steel pipe (6), a prefabricated concrete layer (10) is arranged on the inner side wall of the inner steel pipe (6), and an inner fiber layer (8) is arranged on the inner side of the prefabricated concrete layer (10).

2. A method of fiber-reinforcing a concrete filled steel tubular column according to claim 1, characterized in that: In the step S2 and the step S3, steel fibers are mixed in the poured concrete.

3. A method of fiber-reinforcing a concrete filled steel tubular column according to claim 2, characterized in that: The mixing amount of the fiber concrete formed after mixing the steel fibers in the step S2 and the step S3, that is, the volume rate, is controlled to be 0.5%-2%.

4. A method of fiber-reinforcing a concrete filled steel tubular column according to claim 3, characterized in that: In the step S2, the prefabrication method of the inner fiber composite pipe (2) comprises: Manufacture the inner steel pipe (6); Pour the required amount of concrete into the inner steel pipe (6), and rotate the inner steel pipe (6) at high speed around the axis to make the concrete adhere to the inner wall of the inner steel pipe (6) to form the prefabricated concrete layer (10); Wrap the fiber material on the outer surface of the inner steel pipe (6) to form the outer fiber layer (7); Manufacture a columnar mold, wrap the fiber on the surface of the columnar mold, and form a fiber pipe after demolding, and insert the fiber pipe into the prefabricated concrete layer (10) to form the inner fiber layer (8).

5. The fiber reinforcement method for a steel-concrete composite column according to claim 1, characterized in that: In the step S2, the thickness of the outer fiber layer (7) and the inner fiber layer (8) on the inner fiber composite pipe (2) is not less than 20mm.

6. The method of fiber-reinforcing a concrete filled steel tubular column according to claim 1, wherein: In the step S2, the thickness of the prefabricated concrete layer (10) on the inner fiber composite pipe (2) is not greater than 30mm.

7. The method of claim 1, wherein: the steel tube is a circular steel tube; the fiber-reinforced concrete is a circular fiber-reinforced concrete; and the fiber-reinforced concrete is filled in the steel tube in a state of being mixed with water. The material of the outer fiber layer (7) and the inner fiber layer (8) is one or more of carbon fiber, basalt fiber, glass fiber, aramid fiber and hybrid fiber.

8. The method of fiber-reinforcing a concrete filled steel tubular column according to claim 1, wherein: The wall surface of the segmental stone (3) in the step S3 is pre-chiselled to enhance the connection strength between the segmental stone (3) and the inner concrete layer (5).

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