Equipment and method for reinforcing heavy-load column by adopting externally-sleeved steel pipe and interlayer concrete

Abstract

The invention relates to the technical field of civil engineering structure reinforcement, and particularly discloses a device and method for reinforcing a heavy-load column through an outer sleeve steel pipe and an interlayer concrete, the device comprises an outer sheath reinforcing assembly, a positioning assembly and a concrete layer, and the outer sheath reinforcing assembly is arranged on the outer side of a heavy-load column body in a sleeving mode; a pouring cavity is formed between the outer sheath reinforcing assembly and the heavy-load column body; the multiple sets of positioning assemblies are arranged in the axis direction of the heavy-load column body and used for connecting the heavy-load column body and the outer sheath reinforcing assembly. The pouring cavity is filled with the concrete layer; the strength grade of concrete used by the concrete layer is not lower than C40, and the strength grade of the concrete used by the concrete layer is at least one grade higher than that of the concrete used by the heavy-load column body. The outer sheath reinforcing assembly can generate a good restraining effect on the concrete layer, the excellent characteristics of all the materials are fully played, stress is reliable, a reinforcing structure and an original structure are tightly combined, integrity is good, and failure is not prone to occurring.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering structure reinforcement, and in particular to a device and a method for reinforcing a heavy-load column by using an outer jacket steel pipe and sandwich concrete. Background Art

[0002] Heavy-duty columns usually refer to steel-frame reinforced concrete columns, which are steel frames installed inside ordinary reinforced concrete columns. For high-rise and super-high-rise building structures, the internal forces of the lower structural columns are huge, so heavy-duty columns are often used. However, due to the increase in structural loads, changes in structural functions, or disrepair, heavy-duty columns often face the situation where the bearing capacity is insufficient to meet the use requirements, and heavy-duty columns need to be reinforced.

[0003] The reinforcement methods for heavy-loaded columns mainly include increasing the cross-section reinforcement method, bonding steel plate reinforcement method, external steel plate reinforcement method, external carbon fiber cloth reinforcement method, etc., but all of them have obvious limitations. The increasing cross-section reinforcement method requires wrapping new reinforced concrete on the surface of the original component, which not only requires the support of concrete formwork and the binding of steel cages, but also is cumbersome and inconvenient to construct, with poor economic benefits, and is inevitably affected by the interface problem between the new and old concrete, resulting in poor overall performance and unable to significantly improve the bearing capacity, stiffness and ductility of the reinforced concrete column at the same time; the integrity of the bonding steel plate reinforcement method is also poor, and due to the presence of structural adhesives, the overall durability and fire resistance are poor; the external steel used in the external steel reinforcement method cannot work as a whole with the original component, and can only bear force separately, resulting in low utilization and small improvement.

[0004] To this end, a device and method for reinforcing heavy-loaded columns using outer sleeve steel pipes and interlayer concrete are proposed. The heavy-loaded columns are reinforced by outer sleeve steel pipes and interlayer concrete to solve the technical problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for reinforcing heavy-load columns using outer sleeve steel pipes and interlayer concrete to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides a device for reinforcing a heavy-load column using an outer jacket steel pipe and an interlayer concrete, comprising:

[0007] An outer sheath reinforcement component, wherein the outer sheath reinforcement component is sleeved on the outside of the heavy-load column body, and a casting cavity is provided between the outer sheath reinforcement component and the heavy-load column body;

[0008] A positioning assembly, wherein the positioning assembly is provided in multiple groups and is arranged along the axis direction of the heavy-load column body, and the positioning assembly is used to connect the heavy-load column body and the outer sheath reinforcement assembly;

[0009] A concrete layer is filled in the casting cavity; the strength grade of the concrete used in the concrete layer is not lower than C40, and the strength grade of the concrete used in the concrete layer is at least one grade higher than the concrete strength used in the heavy-load column body.

[0010] Preferably, each group of the positioning components comprises a plurality of positioning members, and the plurality of positioning members are arranged at equal intervals along the circumference of the heavy-load column body;

[0011] The positioning member comprises a concave base, the concave base is fitted with the outer surface of the heavy-load column body, a positioning plate is fixedly connected to the side of the concave base away from the heavy-load column body, and the positioning plate is in contact with the inner surface of the outer sheath reinforcement assembly;

[0012] The positioning assembly also includes a first clamp, and the multiple concave bases in the same group are fixedly mounted on the heavy-load column body through the first clamp.

[0013] Preferably, the positioning plate is provided with corrugated ribs.

[0014] Preferably, the outer sheath reinforcement assembly includes a second clamp and two half-split plates, the two half-split plates are spliced ​​and fixed by the second clamp to form a columnar hollow structure, the columnar hollow structure is sleeved on the outside of the heavy-load column body, and the positioning plate is in contact with the inner wall of the half-split plates; a grouting inlet is provided at the bottom of the side wall of the columnar hollow structure, and a grouting outlet is provided at the top of the side wall of the columnar hollow structure, and the grouting inlet and the grouting outlet are both equipped with connecting heads with switches.

[0015] Preferably, the inner surface of the semi-split plate is provided with corrugated ribs, and the outer surface of the heavy-duty column body is fixedly connected with a corrugated steel plate or a ribbed GFRP cloth or a ribbed CFRP cloth.

[0016] Preferably, the longitudinal rib height of the corrugated ribs is 0.7 mm to 1.6 mm, the transverse rib height is not less than 1.6 mm, and the rib spacing is 7.5 mm to 8.5 mm.

[0017] Preferably, it also includes:

[0018] A bearing base, wherein a mounting hole matching the heavy-load column body is arranged in the middle of the bearing base, a mounting groove is arranged at the top of the bearing base, the mounting groove is coaxially arranged with the mounting hole, and the mounting groove is matched with the bottom of the outer sheath reinforcement component.

[0019] Preferably, the concrete used in the concrete layer is self-compacting, self-expanding fine aggregate concrete; the slump expansion of the fine aggregate concrete is not less than 650mm, the slump expansion loss within 2h is less than 10%, the T500 flow time is not more than 5s, and the V-funnel passing time is not more than 15s.

[0020] Preferably, the mix ratio of the fine aggregate concrete is: cement 300kg / m 3 、Fly ash 150kg / m 3 、Mineral powder 1500kg / m 3 , expansion agent 75kg / m 3 , water 160kg / m 3 , coarse aggregate 800kg / m 3 , fine aggregate 900kg / m 3 , water reducing agent 7.5kg / m 3 ;

[0021] The coarse aggregate includes continuously graded crushed stone with a particle size of 5 mm to 10 mm and continuously graded crushed stone with a particle size of 2.36 mm to 5 mm, wherein the continuously graded crushed stone with a particle size of 5 mm to 10 mm accounts for no less than 70%;

[0022] The fine aggregate is natural medium sand with a mud content of no more than 1.0% and a fineness modulus of 2.6 to 2.9, wherein the proportion of particles passing through a 0.6 mm sieve is no less than 70%, and the proportion of particles passing through a 0.15 mm sieve is no more than 10%.

[0023] A method for reinforcing a heavy-load column by using an outer jacket steel pipe and sandwich concrete comprises the following steps:

[0024] S1. Treat the surface of the heavy-load column body;

[0025] S2. Install the positioning assembly on the surface of the heavy-load column body;

[0026] S3. Install the outer sheath reinforcement assembly on the outer side of the heavy-load column body;

[0027] S4, preparing concrete for pouring the concrete layer;

[0028] S5, pouring the concrete in S4 into the pouring cavity between the heavy-load column body and the outer sheath reinforcement assembly to form a concrete layer;

[0029] S6. Perform rust-proof treatment on the outer wall of the outer sheath reinforcement assembly.

[0030] Compared with the prior art, the present invention has the following advantages and technical effects:

[0031] 1. The present invention can greatly improve the bearing capacity of the heavy-loaded column body by setting an outer sheath reinforcement component and pouring a concrete layer between the outer sheath reinforcement component and the heavy-loaded column body. The outer sheath reinforcement component can produce a good restraining effect on the poured concrete layer, give full play to the excellent characteristics of each material, and at the same time, the force is reliable, the reinforced structure is closely combined with the original structure, the integrity is good, and it is not easy to fail.

[0032] 2. The present invention abandons the method of welding for splicing semi-split plates, which will not damage the semi-split plates themselves, avoid uneven internal stress distribution, and avoid stress concentration at the welds. Compared with the welding method, the present invention adopts a high-strength steel hoop method, which can fully reduce the risk of the weld being damaged first when the upper load is too large, that is, the risk of the weld bursting and causing the outer steel pipe to crack. In addition, the high-strength steel hoop can increase the hoop coefficient, which helps to enhance the bearing capacity of the overall column after reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A bottom cross-sectional view of a device for reinforcing a heavy-load column using a jacket steel pipe and sandwich concrete according to the present invention;

[0035] Figure 2 It is a cross-sectional top view of the device of the present invention that uses a jacket steel pipe and sandwich concrete to reinforce a heavy-load column;

[0036] Figure 3 It is a cross-sectional schematic diagram of the bearing base of the present invention;

[0037] In the figure: 1. Heavy-load column body; 2. Concrete layer; 3. Concave base; 4. Positioning plate; 5. First clamp; 6. Second clamp; 7. Semi-split plate; 8. Load-bearing base; 9. Installation groove; 10. Connector. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0039] like Figures 1 to 3As shown, the present invention provides a device for reinforcing a heavy-load column using an outer jacket steel pipe and an interlayer concrete, comprising:

[0040] An outer sheath reinforcement component is sleeved on the outside of the heavy-load column body 1, and a casting cavity is provided between the outer sheath reinforcement component and the heavy-load column body 1;

[0041] Positioning components, multiple groups of positioning components are provided and arranged along the axis direction of the heavy-load column body 1, and the positioning components are used to connect the heavy-load column body 1 and the outer sheath reinforcement component;

[0042] Concrete layer 2, concrete layer 2 is filled in the casting cavity; the strength grade of the concrete used in the concrete layer 2 is not less than C40, and the strength grade of the concrete used in the concrete layer 2 is at least one grade higher than the concrete strength used in the heavy-load column body 1.

[0043] The present invention can greatly improve the bearing capacity of the heavy-loaded column body 1 by setting an outer sheath reinforcement component and pouring a concrete layer 2 between the outer sheath reinforcement component and the heavy-loaded column body 1. The outer sheath reinforcement component can produce a good restraining effect on the poured concrete layer 2, give full play to the excellent characteristics of each material, and at the same time, the force is reliable, the reinforced structure is closely combined with the original structure, has good integrity, and is not easy to fail.

[0044] According to a further optimized solution, each group of positioning components includes a plurality of positioning members, and the plurality of positioning members are arranged at equal intervals along the circumference of the heavy-load column body 1;

[0045] The positioning member includes a concave base 3, which is fitted with the outer surface of the heavy-load column body 1, and a positioning plate 4 is fixedly connected to the side of the concave base 3 away from the heavy-load column body 1, and the positioning plate 4 is in contact with the inner surface of the outer sheath reinforcement assembly;

[0046] The positioning assembly also includes a first clamp 5 , which is a high-strength steel sleeve. The multiple concave bases 3 in the same group are fixedly mounted on the heavy-load column body 1 through the first clamp 5 .

[0047] By fixing the positioning piece with the first clamp 5, the heavy-loaded column body 1 will not be damaged, and stress concentration and local fragility that lead to cracking first under external loads can be avoided. Moreover, through the provision of the first clamp 5, the first clamp 5 is equivalent to adding a stirrup to the outside of the heavy-loaded column body 1, which can further increase the strength of the concrete layer 2 after pouring the concrete layer 2.

[0048] In addition, the provision of the positioning piece can ensure that the outer sheath reinforcement assembly is aligned with the heavy-load column body 1, thereby avoiding the occurrence of uneven structural force.

[0049] According to a further optimization scheme, in order to strengthen the interaction between the concrete and the positioning member, corrugated ribs are provided on the positioning plate 4 .

[0050] A further optimized solution is provided, in which the outer sheath reinforcement assembly comprises a second clamp 6 and two half-split plates 7. The second clamp 6 is a high-strength steel sleeve, and the material of the half-split plates 7 is steel. The two half-split plates 7 are spliced ​​and fixed by the second clamp 6 to form a columnar hollow structure. The columnar hollow structure is sleeved on the outside of the heavy-loaded column body 1, and the positioning plate 4 is in contact with the inner wall of the half-split plates 7. A grouting inlet is arranged at the bottom of the side wall of the columnar hollow structure, and a grouting outlet is arranged at the top of the side wall of the columnar hollow structure. Both the grouting inlet and the grouting outlet are equipped with a connector 10 with a switch.

[0051] The second clamp 6 is used to enclose the two half-split plates 7 without damaging the steel pipe itself, thereby avoiding uneven internal stress distribution and stress concentration at the weld. Compared with welding, the use of high-strength steel sleeves can fully reduce the risk of the weld being damaged first when the upper load is too large, that is, the risk of the weld bursting and causing the outer steel pipe to crack. In addition, the high-strength steel sleeve can increase the sleeve coefficient, which helps to enhance the bearing capacity of the overall column after reinforcement.

[0052] To further optimize the solution, in order to strengthen the bonding with concrete and improve the bonding tightness between the reinforced structure and the original structure, corrugated ribs are provided on the inner surface of the semi-split plate 7, and the outer surface of the heavy-load column body 1 is fixedly connected with a corrugated steel plate or a ribbed GFRP cloth or a ribbed CFRP cloth.

[0053] To further optimize the plan, in order to facilitate the penetration of concrete into the inter-rib space, the longitudinal rib height of the corrugated ribs is 0.7mm to 1.6mm, the transverse rib height is not less than 1.6mm, and the rib spacing is 7.5mm to 8.5mm.

[0054] Further optimization plans also include:

[0055] The bearing base 8 has a mounting hole in the middle thereof which matches the heavy-load column body 1 , and a mounting groove 9 is provided at the top of the bearing base 8 . The mounting groove 9 is coaxially arranged with the mounting hole and matches the bottom of the outer sheath reinforcement assembly.

[0056] The bearing base 8 is composed of two semicircular structures. The bearing base 8 can fix the heavy-load column body 1 and the two half-split plates 7 on the one hand, and can also enhance the bearing capacity of the column foot on the other hand.

[0057] To further optimize the solution, in order to achieve the effect of one-time forming of concrete layer 2 during pouring without the need for vibration, the concrete used for concrete layer 2 is self-compacting, self-expanding fine aggregate concrete; the slump expansion of the fine aggregate concrete is not less than 650mm, the slump expansion loss within 2h is less than 10%, the T500 flow time is not more than 5s, and the V-funnel passing time is not more than 15s.

[0058] To further optimize the solution, the mix ratio of fine aggregate concrete is: cement 300kg / m 3 、Fly ash 150kg / m 3 、Mineral powder 1500kg / m 3 , expansion agent 75kg / m 3 , water 160kg / m 3 , coarse aggregate 800kg / m 3 , fine aggregate 900kg / m 3 , water reducing agent 7.5kg / m 3 ;

[0059] In order to fully reduce the void ratio, the coarse aggregate includes continuously graded crushed stone with a particle size of 5mm to 10mm and continuously graded crushed stone with a particle size of 2.36mm to 5mm, among which the proportion of continuously graded crushed stone with a particle size of 5mm to 10mm is not less than 70%;

[0060] In order to fully avoid segregation, the fine aggregate is natural medium sand with a mud content of no more than 1.0% and a fineness modulus of 2.6 to 2.9, among which the proportion of particles passing through a 0.6 mm sieve is no less than 70%, and the proportion of particles passing through a 0.15 mm sieve is no more than 10%.

[0061] To further optimize the plan, in order to ensure that the 28-day limited expansion rate of concrete is ≥0.02%, the water reducer shall use a polycarboxylic acid-based high-efficiency water reducer with a water reduction rate ≥30%, and the expansive agent shall use a calcium sulfoaluminate or magnesium oxide expansive agent. If a calcium sulfoaluminate expansive agent is used, the dosage shall be 8-12%; if a magnesium oxide expansive agent is used, the dosage shall be 5-8%, so as to fully compensate for the shrinkage and ensure that the concrete can be in close contact with the inner and outer steel pipe surfaces and work together.

[0062] A method for reinforcing a heavy-load column by using an outer jacket steel pipe and sandwich concrete comprises the following steps:

[0063] S1, processing the surface of the heavy-load column body 1;

[0064] A thin corrugated steel plate with a thickness of about 2 mm can be glued on the surface of the heavy-load column body 1, or a layer of GFRP cloth or CFRP cloth with ribs on the surface can be directly wrapped on the surface of the heavy-load column body 1 to achieve roughening of the surface of the heavy-load column body 1;

[0065] S2, installing a positioning assembly on the surface of the heavy-load column body 1;

[0066] The positioning pieces are installed layer by layer, so that the concave base 3 on the same layer fits the surface of the heavy-load column body 1, and is initially fixed by gluing. The positioning plate 4 and the concave base 3 are fixed by welding. The number of positioning pieces in the same layer is not less than two. After the positioning pieces in the same layer are all glued to the heavy-load column body 1, the concave base 3 is clamped and fixed with a high-strength steel hoop. The positioning pieces on different layers are staggered.

[0067] S3, installing an outer sheath reinforcement assembly on the outer side of the heavy-load column body 1;

[0068] After the positioning assembly is installed, the bearing base 8 is installed on the bottom plate of the heavy-load column body 1, and the two half-split plates 7 are inserted into the mounting grooves 9 on the bearing base 8 to achieve mutual positioning between the bearing base 8 and the two half-split plates 7; then a high-strength steel hoop is sleeved on the outer side of the steel pipe composed of the two half-split plates 7, and the two half-split plates 7 are clamped and fixed by the high-strength steel hoop;

[0069] S4, configure concrete for pouring concrete layer 2;

[0070] S5, pouring the concrete in S4 into the pouring cavity between the heavy-load column body 1 and the outer sheath reinforcement assembly to form a concrete layer 2;

[0071] When pouring concrete, the caliber of the concrete pouring gun used must be at least 4 times the maximum particle size of the aggregate. When slurry continuously flows out of the grouting outlet, the pouring is considered to be completed. In addition, the number of grouting inlets can be set to multiple in the vertical direction, and the grouting inlet and outlet can be conveniently blocked by using the connector 10. By changing the position of the grouting inlet, the pouring pressure can be reduced.

[0072] S6. Perform rust-proof treatment on the outer wall of the outer sheath reinforcement assembly.

[0073] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A device for reinforcing heavy-load columns using outer jacket steel pipes and interlayer concrete, characterized in that: include: An outer sheath reinforcement component, the outer sheath reinforcement component is sleeved on the outside of the heavy-load column body (1), and a casting cavity is provided between the outer sheath reinforcement component and the heavy-load column body (1); Positioning components, the positioning components are provided in multiple groups and are arranged along the axial direction of the heavy-load column body (1), and the positioning components are used to connect the heavy-load column body (1) and the outer sheath reinforcement component; A concrete layer (2), the concrete layer (2) is filled in the casting cavity; the strength grade of the concrete used in the concrete layer (2) is not less than C40, and the strength grade of the concrete used in the concrete layer (2) is at least one grade higher than the strength of the concrete used in the heavy-load column body (1).

2. The equipment for reinforcing heavy-load columns by using outer jacket steel pipe and sandwich concrete according to claim 1 is characterized in that: Each group of the positioning components comprises a plurality of positioning members, and the plurality of positioning members are arranged at equal intervals along the circumference of the heavy-load column body (1); The positioning member comprises a concave base (3), the concave base (3) is in contact with the outer surface of the heavy-load column body (1), a positioning plate (4) is fixedly connected to the side of the concave base (3) away from the heavy-load column body (1), and the positioning plate (4) is in contact with the inner surface of the outer sheath reinforcement assembly; The positioning assembly further comprises a first clamp (5), and the plurality of concave bases (3) in the same group are all fixedly mounted on the heavy-load column body (1) via the first clamp (5).

3. The equipment for reinforcing heavy-load columns using outer jacket steel pipes and sandwich concrete according to claim 2 is characterized in that: The positioning plate (4) is provided with corrugated ribs.

4. The equipment for reinforcing heavy-load columns using outer jacket steel pipes and sandwich concrete according to claim 2 is characterized in that: The outer jacket reinforcement assembly comprises a second clamp (6) and two half-split plates (7), the two half-split plates (7) are spliced ​​and fixed by the second clamp (6) to form a columnar hollow structure, the columnar hollow structure is sleeved on the outside of the heavy-load column body (1), and the positioning plate (4) is in contact with the inner wall of the half-split plates (7); A grouting inlet is arranged at the bottom of the side wall of the columnar hollow structure, and a grouting outlet is arranged at the top of the side wall of the columnar hollow structure. Both the grouting inlet and the grouting outlet are equipped with a connector (10) with a switch.

5. The equipment for reinforcing heavy-load columns by using outer jacket steel pipe and sandwich concrete according to claim 4 is characterized in that: The inner surface of the semi-split plate (7) is provided with corrugated ribs, and the outer surface of the heavy-duty column body (1) is fixedly connected with a corrugated steel plate or a ribbed GFRP cloth or a ribbed CFRP cloth.

6. The equipment for reinforcing heavy-load columns using outer jacket steel pipes and sandwich concrete according to claim 3 or 5, characterized in that: The longitudinal rib height of the corrugated ribs is 0.7 mm to 1.6 mm, the transverse rib height is not less than 1.6 mm, and the rib spacing is 7.5 mm to 8.5 mm.

7. The equipment for reinforcing heavy-load columns by using outer jacket steel pipe and sandwich concrete according to claim 1 is characterized in that: Also includes: A bearing base (8), wherein a mounting hole matching the heavy-load column body (1) is arranged in the middle of the bearing base (8), and a mounting groove (9) is arranged at the top of the bearing base (8), wherein the mounting groove (9) is coaxially arranged with the mounting hole, and the mounting groove (9) is matched with the bottom of the outer sheath reinforcement component.

8. The equipment for reinforcing heavy-load columns using outer jacket steel pipes and sandwich concrete according to claim 1 is characterized in that: The concrete used in the concrete layer (2) is self-compacting, self-expanding fine aggregate concrete; the slump expansion of the fine aggregate concrete is not less than 650mm, the slump expansion loss within 2 hours is less than 10%, the T500 flow time is not more than 5s, and the V-funnel passing time is not more than 15s.

9. The equipment for reinforcing heavy-load columns using outer jacket steel pipes and sandwich concrete according to claim 8, characterized in that: The mix ratio of the fine aggregate concrete is: cement 300kg / m 3 、Fly ash 150kg / m 3 、Mineral powder 1500kg / m 3 , expansion agent 75kg / m 3 , water 160kg / m 3 , coarse aggregate 800kg / m 3 , fine aggregate 900kg / m 3 , water reducing agent 7.5kg / m 3 ; The coarse aggregate includes continuously graded crushed stone with a particle size of 5 mm to 10 mm and continuously graded crushed stone with a particle size of 2.36 mm to 5 mm, wherein the continuously graded crushed stone with a particle size of 5 mm to 10 mm accounts for no less than 70%; The fine aggregate is natural medium sand with a mud content of no more than 1.0% and a fineness modulus of 2.6 to 2.9, wherein the proportion of particles passing through a 0.6 mm sieve is no less than 70%, and the proportion of particles passing through a 0.15 mm sieve is no more than 10%.

10. A method for reinforcing a heavy-load column by using an outer jacket steel pipe and an interlayer concrete, using the device for reinforcing a heavy-load column by using an outer jacket steel pipe and an interlayer concrete as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, treating the surface of the heavy-load column body (1); S2, installing a positioning assembly on the surface of the heavy-load column body (1); S3, installing an outer sheath reinforcement assembly on the outer side of the heavy-load column body (1); S4, preparing concrete for pouring the concrete layer (2); S5, pouring the concrete in S4 into the pouring cavity between the heavy-load column body (1) and the outer sheath reinforcement assembly to form a concrete layer (2); S6. Perform rust-proof treatment on the outer wall of the outer sheath reinforcement assembly.

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