A core-constrained reinforced UHPC assembly composite column and an assembly method

Abstract

The application discloses a kind of core constraint reinforced UHPC assembly composite columns, including upper support column, lower support column and node connecting device;The ring side surface of upper support column and the ring side surface of lower support column are all provided with outer package UHPC layer;Node connecting device includes upper end plate, lower end plate and outer ring plate assembly, the top surface of upper end plate is detachably connected with the bottom of upper support column, the bottom surface of lower end plate is detachably connected with the top surface of lower support column, outer ring plate assembly is set between the bottom surface of upper end plate and the top surface of lower end plate, first core support block is provided in outer ring plate assembly;First avoiding hole is provided on upper end plate, second avoiding hole is provided on lower end plate, first core support block forms male and female groove connecting structure with upper support column through first avoiding hole, first core support block forms male and female groove connecting structure with lower support column through second avoiding hole.The composite column of the application can be prefabricated, avoid the problem of wet operation on site, enhance core constraint, with high-strength characteristics and durability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building, in particular to a core constraint enhanced UHPC assembly composite column and an assembly method. BACKGROUND

[0002] Some substation established in coastal areas need to run in salt spray corrosion environment for a long time, and the internal building structure form is mostly traditional reinforced concrete pouring. The traditional reinforced concrete structure connection technology is sleeve grouting connection; such connection node not only has complex structure, high precision requirement, and difficult grouting quality control, but also easily leads to problems such as reinforcement corrosion, too much on-site wet operation of substation in coastal areas, which seriously affects the durability and safety of the building.

[0003] At the same time, many coastal areas are also located in earthquake active zones, and there are higher requirements for the seismic deformation performance and anti-collapse capacity of buildings. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a core constraint enhanced UHPC assembly composite column and an assembly method, which is simple in structure, eliminates on-site wet operation, and improves the durability and safety of the building of substation in coastal areas.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is:

[0006] A core constraint enhanced UHPC assembly composite column, comprising an upper support column, a lower support column and a node connecting device;

[0007] The ring side surface of the upper support column and the ring side surface of the lower support column are provided with an outer UHPC layer;

[0008] The node connecting device comprises an upper end plate, a lower end plate and an outer ring plate assembly, the top surface of the upper end plate is detachably connected with the bottom of the upper support column, the bottom surface of the lower end plate is detachably connected with the top surface of the lower support column, and the outer ring plate assembly is arranged between the bottom surface of the upper end plate and the top surface of the lower end plate, and a first core support block is arranged in the outer ring plate assembly;

[0009] The upper end plate is provided with a first avoiding hole, the lower end plate is provided with a second avoiding hole, the first core support block forms a male and female groove connection structure with the upper support column through the first avoiding hole, and the first core support block forms a male and female groove connection structure with the lower support column through the second avoiding hole.

[0010] In order to solve the above technical problems, another technical scheme adopted by the present application is:

[0011] An assembly method of a core constraint enhanced UHPC assembly composite column, applied to the core constraint enhanced UHPC assembly composite column, comprising the following steps:

[0012] S1, prefabricate the upper support column, the lower support column and the node connecting device;

[0013] S2, when installing on site, fix the lower support column, align the second avoiding hole of the lower end plate of the node connecting device with the lower support column, connect the lower end plate and the lower support column after the male and female groove connection of the first core support block and the lower support column is completed;

[0014] S3, align the upper support column with the first avoiding hole of the upper end plate of the node connecting device, connect the upper end plate and the upper support column after the male and female groove connection of the first core support block and the upper support column is completed, and the assembly is completed.

[0015] The core constraint enhanced UHPC assembly composite column and the assembly method have the advantages that the assembly structure composed of the upper support column, the lower support column and the node connecting device can be prefabricated, the problem of wet operation on site is avoided, the effect of "strong node and weak component" is realized in the form of column-node connection, the shear force transmission between the support column and the node is realized through the male and female groove connection inside, the core constraint is enhanced, the UHPC is arranged as the outer wrapping material outside, the high-strength characteristics and the durability of the UHPC can be fully utilized, and the load bearing capacity and the durability of the component are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a core constraint enhanced UHPC assembly composite column (including an outer wrapping UHPC layer) of the application;

[0017] Figure 2 It is a structural schematic diagram of a core constraint enhanced UHPC assembly composite column (not including an outer wrapping UHPC layer) of the application;

[0018] Figure 3 It is an internal structural schematic diagram of an upper support column of a core constraint enhanced UHPC assembly composite column of the application;

[0019] Figure 4 It is a structural schematic diagram of a node connecting device of a core constraint enhanced UHPC assembly composite column of the application;

[0020] Figure 5 It is an assembly schematic diagram of longitudinal steel bars and an upper end plate of a core constraint enhanced UHPC assembly composite column of the application;

[0021] Figure 6A structural schematic diagram of a second stiffening plate of a core constraint reinforced UHPC assembly composite column according to the present application;

[0022] Figure 7 A step schematic diagram of an assembly method of a core constraint reinforced UHPC assembly composite column according to the present application.

[0023] Label explanation:

[0024] 1, upper support column; 2, lower support column; 3, upper end plate; 4, lower end plate; 5, outer ring plate assembly; 6, outer wrapped UHPC layer; 7, first avoiding hole; 8, second avoiding hole; 9, steel cage; 10, second core support block; 11, mounting point;

[0025] 51, upper transverse plate; 52, lower transverse plate; 53, first vertical annular support plate; 54, first core support block; 55, nut; 56, gasket; 57, adapter; 58, first stiffening plate; 59, second stiffening plate; 60, first vertical annular support plate;

[0026] 91, longitudinal steel bar;

[0027] 101, metal pipe; 102, sandwich concrete;

[0028] 591, force transmission rib plate. DETAILED DESCRIPTION

[0029] In order to explain the technical content, the purposes and effects of the present application in detail, the following will be described in combination with the embodiments and the accompanying drawings.

[0030] Please refer to Figures 1 to 6 A core constraint reinforced UHPC assembly composite column, comprising an upper support column 1, a lower support column 2 and a node connecting device;

[0031] The ring side surface of the upper support column 1 and the ring side surface of the lower support column 2 are both provided with an outer wrapped UHPC layer 6;

[0032] The node connecting device comprises an upper end plate 3, a lower end plate 4 and an outer ring plate assembly 5, the top surface of the upper end plate 3 is detachably connected with the bottom of the upper support column 1, the bottom surface of the lower end plate 4 is detachably connected with the top surface of the lower support column 2, the outer ring plate assembly 5 is arranged between the bottom surface of the upper end plate 3 and the top surface of the lower end plate 4, and the outer ring plate assembly 5 is provided with a first core support block 54;

[0033] The upper end plate 3 is provided with a first avoiding hole 7, the lower end plate 4 is provided with a second avoiding hole 8, the first core support block 54 forms a male and female groove connecting structure with the upper support column 1 through the first avoiding hole 7, and the first core support block 54 forms a male and female groove connecting structure with the lower support column 2 through the second avoiding hole 8.

[0034] From the above description, the beneficial effects of the present application are that a core constraint enhanced UHPC assembly column and assembly method are provided, which adopts an assembly structure composed of an upper column 1, a lower column 2 and a node connecting device, can be prefabricated, avoids the problem of wet operation on site, realizes the effect of "strong node, weak component" in the form of column-node connection, realizes the shear force transmission between the column and the node through the male and female groove connection inside, enhances the core constraint, arranges UHPC as an outer material outside, can fully exert the high-strength characteristics and durability of UHPC, and significantly improves the bearing capacity and durability of the component.

[0035] Further, the outer ring plate assembly 5 comprises an upper transverse plate 51, a lower transverse plate 52 and a first vertical annular support plate 53;

[0036] The upper transverse plate 51 is connected with the upper end plate 3, and the upper transverse plate 51 is provided with a first opening corresponding to the first avoiding hole 7; the lower transverse plate 52 is connected with the lower end plate 4, and the lower transverse plate 52 is provided with a second opening corresponding to the second avoiding hole 8;

[0037] The first vertical annular support plate 53 is arranged between the upper transverse plate 51 and the lower transverse plate 52, and the first vertical annular support plate 53 is connected with the upper transverse plate 51 and the lower transverse plate 52 respectively;

[0038] The first core support block 54 is located in the avoiding space surrounded by the upper end plate 3, the upper transverse plate 51, the first vertical annular support plate 53, the lower transverse plate 52 and the lower end plate 4.

[0039] From the above description, the outer ring plate assembly 5 is composed of the upper transverse plate 51, the lower transverse plate 52 and the first vertical annular support plate 53, the upper transverse plate 51 and the lower transverse plate 52 serve as the top cover and the base of the first vertical annular support plate 53 respectively, thereby preliminarily forming the surrounding structure capable of accommodating the first core support block 54, and then openings are formed on the upper transverse plate 51 and the lower transverse plate 52 to facilitate the connection of the first core support block 54 with the upper column 1 and the lower column 2.

[0040] Further, the outer ring plate assembly 5 further comprises a second vertical annular support plate 60;

[0041] The upper end plate 3 and the upper transverse plate 51 are connected through one of the second vertical annular support plates 60, and the lower end plate 4 and the lower transverse plate 52 are connected through one of the second vertical annular support plates 60;

[0042] The inner ring of the second vertical annular support plate 60 between the upper end plate 3 and the upper transverse plate 51 is adapted to the shape and size of the first opening;

[0043] The inner ring of the second vertical annular support plate 60 between the lower end plate 4 and the lower transverse plate 52 is adapted to the shape and size of the second opening.

[0044] As can be seen from the above description, the force transmission path between the upper end plate 3 and the upper transverse plate 51 and between the lower end plate 4 and the lower transverse plate 52 is lengthened by adding the second vertical annular support plate 60; at the same time, the second vertical annular support plate 60 jointly forms an avoidance space, improves the fillable range of the first core support block 54, and enhances the support effect.

[0045] Further, the second vertical annular support plate 60 is formed by splicing at least two force transmission rib plates 591;

[0046] On one side of the vertical direction of the first vertical annular support plate 53, the adjacent force transmission rib plates 591 are spliced into a right angle shape or a cross shape.

[0047] As can be seen from the above description, using a plurality of force transmission rib plates 591 spliced into a right angle shape or a cross shape as an intermediate support member can improve the pressure bearing capacity of the member and make it more stable and less likely to deform.

[0048] Further, the outer ring plate assembly 5 further comprises a first stiffening plate 58;

[0049] The first stiffening plate 58 is connected to the upper transverse plate 51 and the lower transverse plate 52 respectively, and the first stiffening plate 58, the upper transverse plate 51 and the lower transverse plate 52 form a I-shaped structure.

[0050] Further, the outer ring plate assembly 5 further comprises a second stiffening plate 59;

[0051] The second stiffening plate 59 is arranged between the upper end plate 3 and the upper transverse plate 51 and between the lower end plate 4 and the lower transverse plate 52.

[0052] As can be seen from the above description, by arranging the first stiffening plate 58 and the second stiffening plate 59, the support capacity of the outer side of the member can be significantly improved, and phenomena such as deformation and separation are avoided.

[0053] Further, the upper support column 1 and the lower support column 2 each comprise a steel cage 9 and a second core support block 10;

[0054] The steel cage 9 is sleeved on the second core support block 10, and the outer UHPC layer 6 is arranged on the steel cage 9.

[0055] From the above description, the second core support block 10 as the main core constraint, cooperates with the steel cage 9 structure and the outer UHPC layer 6, can significantly improve the seismic deformation performance and the anti-collapse ability of the composite column, even if the outer UHPC layer 6 exits work, under the joint action of the second core support block 10 and the male and female groove, the composite column can maintain the main shaft strength.

[0056] Further, the upper support column 1 and the lower support column 2 both include a metal pipe 101;

[0057] The metal pipe 101 is arranged through the second core support block 10, and the first avoiding hole 7 and the second avoiding hole 8 are both matched with the metal pipe 101;

[0058] The first core support block 54 forms a male and female groove connection structure with the metal pipe 101 located in the upper support column 1 and the metal pipe 101 located in the lower support column 2 respectively.

[0059] From the above description, by arranging the metal pipe 101, the core axial force of the composite column can be significantly improved, and high-strength seismic deformation and anti-collapse can be realized.

[0060] Further, the upper end plate 3 and the lower end plate 4 are both provided with mounting points 11 corresponding to the longitudinal steel bars 91 of the steel cage 9 one by one;

[0061] The end of the longitudinal steel bar 91 is locked and fixed on the mounting point 11 through the nut 55.

[0062] From the above description, the upper end plate 3 and the lower end plate 4 are connected with the upper support column 1 and the lower support column 2 by aligning the nut 55 with the longitudinal steel bar 91, which not only facilitates installation, but also guarantees the stress reliability of the connection.

[0063] Please refer to Figure 7 A core constraint enhanced UHPC assembly composite column assembly method applied to the above-mentioned core constraint enhanced UHPC assembly composite column, including the following steps:

[0064] S1, prefabricating the upper support column 1, the lower support column 2 and the node connecting device;

[0065] S2, when installing on site, fixing the lower support column 2, aligning the second avoiding hole 8 of the lower end plate 4 of the node connecting device with the lower support column 2, connecting the lower end plate 4 and the lower support column 2 after the male and female groove connection of the first core support block 54 and the lower support column 2 is completed;

[0066] S3, align the upper support column 1 with the first avoiding hole 7 of the upper end plate 3 of the node connecting device, connect the upper end plate 3 and the upper support column 1 after the first core support block 54 is connected with the male and female groove of the upper support column 1, and the assembly is completed.

[0067] From the above description, the beneficial effects of the present application are that a core constraint enhanced UHPC assembly composite column and an assembly method are provided, an assembly structure composed of an upper support column 1, a lower support column 2 and a node connecting device is used, precast can be achieved, on-site wet work problems are avoided, the effect of “strong node, weak component” is achieved in the form of column-node connection, shear force transmission between the support column and the node is achieved through male and female groove connection inside, core constraint is enhanced, UHPC is arranged as an outer wrapping material outside, the high strength characteristics and durability performance of UHPC can be fully utilized, and the load bearing capacity and durability of the component are significantly improved.

[0068] Please refer to Figures 1 to 6 , the first embodiment of the present application is:

[0069] A core constraint enhanced UHPC assembly composite column, comprising an upper support column 1, a lower support column 2 and a node connecting device, the ring side surface of the upper support column 1 and the ring side surface of the lower support column 2 are provided with an outer wrapping UHPC layer 6; the node connecting device comprises an upper end plate 3, a lower end plate 4 and an outer ring plate assembly 5, the top surface of the upper end plate 3 is detachably connected with the bottom of the upper support column 1, the bottom surface of the lower end plate 4 is detachably connected with the top surface of the lower support column 2, the outer ring plate assembly 5 is arranged between the bottom surface of the upper end plate 3 and the top surface of the lower end plate 4, and the outer ring plate assembly 5 is provided with a first core support block 54; the upper end plate 3 is provided with a first avoiding hole 7, the lower end plate 4 is provided with a second avoiding hole 8, the first core support block 54 forms a male and female groove connection structure with the upper support column 1 through the first avoiding hole 7, and the first core support block 54 forms a male and female groove connection structure with the lower support column 2 through the second avoiding hole 8.

[0070] Among them, the outer wrapping UHPC layer 6 is: ultra-high performance concrete (Ultra-High Performance Concrete, UHPC), which has ultra-high compressive strength (fc> 120 MPa), higher tensile strength (ft> 5 MPa) and tensile strain hardening characteristics.

[0071] In this embodiment, as Figure 3 and Figure 5As shown, the upper support column 1 and the lower support column 2 each comprise a steel cage 9 and a second core support block 10; the steel cage 9 is sleeved on the second core support block 10, and the outer wrapping UHPC layer 6 is arranged on the steel cage 9; the upper end plate 3 and the lower end plate 4 each are provided with mounting points 11 corresponding to the longitudinal steel bars 91 of the steel cage 9 one by one; the end portions of the longitudinal steel bars 91 are fixed on the mounting points 11 by nuts 55; at the same time, the second core support block 10 and the first core support block 54 are connected by means of a male-female groove connection; specifically, a male groove or a female groove is provided on the second core support block 10 in advance, and a female groove or a male groove is provided at the corresponding position on the first core support block 54.

[0072] The second core support block 10 can be selected as a sandwiched concrete 102 and a constraint reinforced core column; the constraint reinforced core column is composed of a metal pipe 101 and an inner filling concrete, the sandwiched concrete 102 is filled between the constraint reinforced core column and the outer wrapping UHPC layer 6, and the first avoiding hole 7 and the second avoiding hole 8 are matched with the metal pipe 101; in the case of forming a male groove, one end of the metal pipe 101 can be designed to extend out of the second core support block 10 as a male groove; and a female groove corresponding to the metal pipe 101 is reserved on the first core support block 54; or an adapter 57 as a male groove can be additionally installed on the first core support block 54, and a corresponding female groove is left on the second core support block 10.

[0073] In the embodiment, as shown in Figure 4 The outer ring plate assembly 5 comprises a second vertical annular support plate 60, an upper transverse plate 51, a lower transverse plate 52 and a first vertical annular support plate 53; the upper transverse plate 51 is provided with a first opening corresponding to the first avoiding hole 7, and the lower transverse plate 52 is provided with a second opening corresponding to the second avoiding hole 8; the upper end plate 3 and the upper transverse plate 51 are connected by a second vertical annular support plate 60, and the lower end plate 4 and the lower transverse plate 52 are connected by a second vertical annular support plate 60; the inner ring of the second vertical annular support plate 60 between the upper end plate 3 and the upper transverse plate 51 is matched with the shape and size of the first opening; the inner ring of the second vertical annular support plate 60 between the lower end plate 4 and the lower transverse plate 52 is matched with the shape and size of the second opening. The first vertical annular support plate 53 is arranged between the upper transverse plate 51 and the lower transverse plate 52, and is connected with the upper transverse plate 51 and the lower transverse plate 52 respectively; the first core support block 54 is located in the avoiding space surrounded by the upper end plate 3, the second vertical annular support plate 60, the upper transverse plate 51, the first vertical annular support plate 53, the lower transverse plate 52 and the lower end plate 4. Preferably, as shown in Figure 3 The first core support block 54 can be selected as a concrete block and is formed by pouring in the avoiding space.

[0074] In the embodiment, as shown in Figure 6As shown, the second vertical annular support plate 60 is formed by splicing at least two force transmission rib plates 591; on one side of the vertical direction of the first vertical annular support plate 53, adjacent force transmission rib plates 591 are spliced into a right angle shape or a cross shape. Thus, the tensile force transmission path of the combined group of steel bars is: nut 55→ upper end plate 3→ force transmission rib plate 591→ upper transverse plate 51→ first vertical annular support plate 53; the force transmission path is clear, and the reliability of the force connection is guaranteed.

[0075] Furthermore, in order to improve the support strength, the outer ring plate assembly 5 further comprises a first stiffening plate 58 and a second stiffening plate 59; the first stiffening plate 58 is connected with the upper transverse plate 51 and the lower transverse plate 52 respectively, and the first stiffening plate 58, the upper transverse plate 51 and the lower transverse plate 52 form a I-shaped structure. The second stiffening plate 59 is arranged between the upper end plate 3 and the upper transverse plate 51 and between the lower end plate 4 and the lower transverse plate 52.

[0076] Please refer to Figure 7 Embodiment two of the present application is:

[0077] A core constraint enhanced UHPC assembly composite column assembly method applied to the core constraint enhanced UHPC assembly composite column of embodiment one, comprising the following steps:

[0078] S1, prefabricating the upper support column 1, the lower support column 2 and the node connecting device;

[0079] During the prefabrication process, the first core support block 54 of the node connecting device is provided with a public slot or a female slot for connection during on-site assembly. During the process of manufacturing the upper support column 1 and the lower support column 2, the constraint enhanced core column is poured with concrete to form concrete; after the concrete hardens and is removed from the mold, the longitudinal steel bars 91 and the stirrups are bound according to the drawings to form a steel cage 9, and finally the outer wrapped UHPC layer 6 is poured and molded around the component, and the outer wrapped UHPC layer 6 is removed from the mold after hardening and is maintained.

[0080] S2, during on-site installation, fixing the lower support column 2, aligning the second avoiding hole 8 of the lower end plate 4 of the node connecting device with the lower support column 2, connecting the lower end plate 4 and the lower support column 2 after the public and female slot connection of the first core support block 54 and the lower support column 2 is completed;

[0081] In this embodiment, the process of connecting the lower end plate 4 and the lower support column 2 is to open installation points 11 corresponding to the longitudinal steel bars 91 of the lower support column 2 on the lower end plate 4, and then connect the longitudinal steel bars 91 one by one by using nuts 55; the nuts 55 are provided with gaskets 56, and the connection process of the upper end plate 3 and the upper support column 1 is similar, which will not be described again.

[0082] And, the upper end plate 3 of the node connecting device and the second vertical annular support plate 60, the second vertical annular support plate 60 and the upper transverse plate 51, the upper transverse plate 51 and the first vertical annular support plate 53, etc. can be welded.

[0083] S3, align the upper pillar 1 with the first escape hole 7 of the upper end plate 3 of the node connecting device, connect the upper end plate 3 and the upper pillar 1 after the first core support block 54 is connected with the male and female groove of the upper pillar 1, and the assembly is completed.

[0084] In summary, the application provides a kind of core constraint reinforced UHPC assembly composite column and assembly method, using the assembly structure composed of upper pillar, lower pillar and node connecting device, can be prefabricated, avoid the problem of wet operation on site, simultaneously realize the effect of "strong node, weak component" in the form of column-node connection, realize the shear transfer between pillar and node by male and female groove connection inside, enhance core constraint, outside UHPC is arranged as outer material, can give full play to the high-strength characteristics and durability of UHPC, so as to significantly improve the bearing capacity and durability of component.

[0085] The above is only the embodiment of the application, and does not limit the patent scope of the application, any equivalent transformation or direct or indirect application in related technical field using the content of the specification and drawings of the application is also included in the patent protection scope of the application.

Claims

1. A core-constrained reinforced UHPC assembly composite column, characterized in that, The upper column, the lower column and the node connecting device are provided; The ring side surface of the upper column and the ring side surface of the lower column are provided with an outer UHPC layer; The node connecting device comprises an upper end plate, a lower end plate and an outer ring plate assembly, the top surface of the upper end plate is detachably connected with the bottom of the upper column, the bottom surface of the lower end plate is detachably connected with the top surface of the lower column, the outer ring plate assembly is arranged between the bottom surface of the upper end plate and the top surface of the lower end plate, and the outer ring plate assembly is provided with a first core support block. The upper end plate is provided with a first avoiding hole, the lower end plate is provided with a second avoiding hole, the first core support block forms a male and female groove connecting structure with the upper column through the first avoiding hole, and the first core support block forms a male and female groove connecting structure with the lower column through the second avoiding hole. The outer ring plate assembly comprises an upper transverse plate, a lower transverse plate and a first vertical annular support plate. The upper transverse plate is connected with the upper end plate, the upper transverse plate is provided with a first opening corresponding to the first avoiding hole, the lower transverse plate is connected with the lower end plate, and the lower transverse plate is provided with a second opening corresponding to the second avoiding hole. The first vertical annular support plate is arranged between the upper transverse plate and the lower transverse plate, and the first vertical annular support plate is connected with the upper transverse plate and the lower transverse plate respectively. The first core support block is located in an avoiding space formed by the upper end plate, the upper transverse plate, the first vertical annular support plate, the lower transverse plate and the lower end plate.

2. The core-confined reinforced UHPC assembly composite column according to claim 1, characterized in that, The outer ring plate assembly further comprises a second vertical annular support plate. The upper end plate and the upper transverse plate are connected through a second vertical annular support plate, and the lower end plate and the lower transverse plate are connected through a second vertical annular support plate. The inner ring of the second vertical annular support plate between the upper end plate and the upper transverse plate is matched with the shape and size of the first opening. The inner ring of the second vertical annular support plate between the lower end plate and the lower transverse plate is matched with the shape and size of the second opening.

3. The core-confined reinforced UHPC assembly composite column according to claim 2, characterized in that, The second vertical annular support plate is formed by splicing at least two force transmission rib plates. On one side of the vertical direction of the first vertical annular support plate, adjacent force transmission rib plates are spliced into a right angle shape or a cross shape.

4. The core-confined reinforced UHPC assembly composite column according to claim 1, characterized in that, The outer ring plate assembly further comprises a first stiffening plate. The first stiffening plate is connected with the upper transverse plate and the lower transverse plate respectively, and the first stiffening plate, the upper transverse plate and the lower transverse plate form an I-shaped structure.

5. The core-confined reinforced UHPC assembly composite column according to claim 2, wherein, The outer ring plate assembly further comprises a second stiffening plate. The second stiffening plate is arranged between the upper end plate and the upper transverse plate, and the second stiffening plate is arranged between the lower end plate and the lower transverse plate.

6. The core-confined reinforced UHPC assembly composite column according to claim 1, wherein, The upper column and the lower column each comprise a steel cage and a second core support block. The steel cage is sleeved on the second core support block, and the outer UHPC layer is arranged on the steel cage.

7. The core-confined reinforced UHPC assembly composite column according to claim 6, characterized in that, The upper column and the lower column each comprise a metal pipe. The metal pipe penetrates through the second core support block, and the first avoiding hole and the second avoiding hole are matched with the metal pipe. The first core support block and the metal pipe of the upper support column and the metal pipe of the lower support column form a male-female groove connection structure.

8. The core-confined reinforced UHPC assembly composite column according to claim 6, characterized in that, The upper end plate and the lower end plate are each provided with an installation point corresponding to a longitudinal steel bar of the steel cage; The end of the longitudinal steel bar is fixed to the installation point by a nut lock.

9. An assembly method of the core-restrained reinforced UHPC assembly composite column, applied to the core-restrained reinforced UHPC assembly composite column according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: S1, prefabricating the upper support column, the lower support column and the node connecting device; S2, during on-site installation, fixing the lower support column, aligning the second avoiding hole of the lower end plate of the node connecting device with the lower support column, connecting the lower end plate and the lower support column after the male-female groove connection of the first core support block and the lower support column is completed; S3, aligning the upper support column with the first avoiding hole of the upper end plate of the node connecting device, connecting the upper end plate and the upper support column after the male-female groove connection of the first core support block and the upper support column is completed, and assembling is completed.

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