Fabricated connection of closed-section thin-wall UHPC component and construction method thereof

Abstract

The invention discloses a closed-section thin-wall UHPC component fabricated connection, and belongs to the technical field of constructional engineering, the closed-section thin-wall UHPC component fabricated connection comprises a closed-section thin-wall prefabricated column and a prefabricated beam which are formed by pouring UHPC materials, a first high-strength reinforcing mesh is arranged in the prefabricated column, a second high-strength reinforcing mesh is arranged in the prefabricated beam, first steel structures are pre-buried at the two ends of the prefabricated column, and second steel structures are pre-buried at the two ends of the prefabricated column. Second steel structures are embedded in the two ends of the prefabricated beam, a socket-and-spigot connecting groove is formed in the first steel structure at one end of the prefabricated column, a socket-and-spigot connector is arranged on the first steel structure at the other end of the prefabricated column, and the prefabricated column is connected with the supporting steel column through the first steel structures and the second steel structures. Two adjacent prefabricated columns in the vertical direction are connected through the socket-and-spigot connecting groove in the first steel structure on one prefabricated column and the socket-and-spigot connector on the first steel structure on the other prefabricated column; by optimizing the node structure and the construction technology of the prefabricated column and the prefabricated beam, efficient, high-precision and high-durability fabricated connection is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building engineering, and particularly relates to a closed-section thin-walled UHPC component assembly type connection and a construction method thereof, and is suitable for large-span buildings, industrial plants and assembly type concrete frame structures with high seismic fortification requirements. BACKGROUND

[0002] Traditional assembly type concrete nodes mostly rely on wet work, and have problems such as low construction efficiency and poor durability. Although UHPC material has characteristics such as compressive strength ≥ 120 MPa and excellent self-compacting property, the existing technology still has the following problems in the connection of UHPC thin-walled components: when traditional column-column splicing is performed, a large amount of site pouring is required for full grouting sleeves, and the embedded precision is extremely high; when the existing technology is used for rigid connection of beams and columns: steel nodes are prone to rust, and ordinary concrete nodes lack corrosion resistance and aging resistance. SUMMARY

[0003] In view of the above technical problems, the present application provides a closed-section thin-walled UHPC component assembly type connection, which comprises a closed thin-walled section prefabricated column and a prefabricated beam formed by pouring UHPC material, a high-strength steel mesh one is arranged in the prefabricated column, a high-strength steel mesh two is arranged in the prefabricated beam, a first steel structure is embedded at both ends of the prefabricated column, a second steel structure is embedded at both ends of the prefabricated beam, a socket type connection groove is arranged on the first steel structure at one end of the prefabricated column, a socket type connector is arranged on the first steel structure at the other end of the prefabricated column, the connection of the prefabricated column and the supporting steel column is realized through the first steel structure and the second steel structure, and the connection of two adjacent prefabricated columns in the upward and downward directions is realized through the socket type connection groove on the first steel structure at one end of one prefabricated column and the socket type connector on the first steel structure at the other end of another prefabricated column.

[0004] Further, the first steel structure comprises a sleeve and a connecting steel plate two, the connecting steel plate two is embedded into the end of the prefabricated column and connected with the high-strength steel mesh one, a plurality of pegs one and a plurality of shear keys one are arranged on the side of the connecting steel plate two close to the high-strength steel mesh one, the sleeve is fixedly arranged on the connecting steel plate two, the socket type connection groove is arranged on the sleeve at one end of the prefabricated column, the socket type connector is fixedly arranged on the sleeve at the other end of the prefabricated column, and a connecting steel plate one is fixedly arranged on both sides of each face of each sleeve.

[0005] Furthermore, the second steel structure includes a connecting steel plate five, which is embedded in the end of the precast beam and connected to the high-strength steel mesh two. Connecting steel plates three are provided at both ends of the connecting steel plate five. Multiple shear keys two are fixedly provided on the side of each connecting steel plate three near the high-strength steel mesh two. Multiple stiffening ribs two are fixedly provided between the side of each connecting steel plate three away from the high-strength steel mesh two and the connecting steel plate five. Connecting steel plates four are provided on both sides of the connecting steel plate five.

[0006] Furthermore, the third connecting steel plate is connected to the second connecting steel plate by high-strength bolts, and the fourth connecting steel plate is connected to the first connecting steel plate by high-strength bolts.

[0007] Furthermore, one end of the precast column used for installation on the construction ground is replaced with a pre-embedded first steel structure, and the precast column is installed on the construction ground through the pre-embedded support steel structure.

[0008] Furthermore, the supporting steel structure includes supporting steel columns, which are embedded in the ends of precast columns. A supporting steel plate is fixedly installed at the end of the supporting steel column away from the precast column. Multiple stiffening ribs are provided between the supporting steel plate and the supporting steel column. The supporting steel plate is connected to the construction ground by high-strength bolts through multiple bolt holes.

[0009] Furthermore, a grouting channel for injecting grout is provided at the connection between the precast column and the supporting steel column.

[0010] Furthermore, the connecting steel plate 2 has multiple bolt holes 1, the connecting steel plate 3 has multiple bolt holes 2 that match the bolt holes 1 on the side away from the high-strength steel mesh 2, the connecting steel plate 1 has multiple bolt holes 3, and the connecting steel plate 4 has multiple bolt holes 4 that match the bolt holes 2; the bolt holes 1 and 2, and the bolt holes 3 and 4 are all connected by high-strength bolts.

[0011] This invention also proposes a construction method for prefabricated connection of closed-section thin-walled UHPC components, comprising the following steps:

[0012] S1. Preparation of closed thin-walled section UHPC components: According to the design drawings, prepare multiple closed thin-walled section precast columns and precast beams cast with UHPC material. Among them, the precast columns are equipped with a high-strength steel mesh I, the precast beams are equipped with a high-strength steel mesh II, the first steel structure is embedded at both ends of the precast columns, the second steel structure is embedded at both ends of the precast beams, the first steel structure at one end of the precast column is equipped with a socket-type connection groove, and the first steel structure at the other end of the precast column is equipped with a socket-type connector.

[0013] S2. Design of component connection nodes: The connection between the precast column and the supporting steel column is realized through the first steel structure and the second steel structure. The socket connection between two adjacent precast columns in the vertical direction is realized through the socket connection groove on the first steel structure of one precast column and the socket connection head on the first steel structure of another precast column.

[0014] S3. On-site assembly: The precast columns and supporting steel columns are transported to the construction site and assembled and connected using high-strength bolts.

[0015] S4. Grouting of joint area: After assembly, grouting is performed on the connection joint between the precast column and the supporting steel column, and an anti-corrosion coating is applied to the exposed metal parts.

[0016] S5. Quality Inspection: Inspect the appearance, dimensions, and strength of the connection nodes between the precast columns and the supporting steel columns to ensure they meet the requirements.

[0017] Furthermore, the weight ratio of the UHPC material in S1 is: 35% cement, 28% quartz sand, 10% silica fume, 8% fly ash, 5% mineral powder, 1.8% water-reducing agent, and 4% steel fiber; the water-cement ratio is 0.18.

[0018] The beneficial effects of this invention compared with the prior art are: (1) The prefabricated connection method of the closed section thin-walled UHPC component proposed in this invention makes the connection performance between beams and columns superior: rigid connection is formed by pre-embedded steel plates and high-strength bolts, and the node stiffness and bearing capacity between precast columns and precast beams are high, which is suitable for high-intensity seismic fortification areas; (2) This invention improves construction efficiency: This invention adopts dry operation as the main method, reduces on-site wet operation, shortens the construction cycle, and thus reduces construction costs; (3) The prefabricated connection method of the closed section thin-walled UHPC component proposed in this invention improves the durability of the building: UHPC material and anti-corrosion coating work together to significantly improve the corrosion resistance and anti-aging ability of the nodes; (4) This invention achieves efficient, high-precision and high-durability prefabricated connection by optimizing the node structure and construction process of precast columns and precast beams. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the prefabricated connection structure of the closed-section thin-walled UHPC component of the present invention. Figure 1 .

[0020] Figure 2 This is a partial structural diagram of the prefabricated connection of the closed-section thin-walled UHPC component of the present invention. Figure 1 .

[0021] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0022] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B.

[0023] Figure 5 This is a partial structural diagram of the prefabricated connection of the closed-section thin-walled UHPC component of the present invention. Figure 1

[0024] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point C.

[0025] Figure 7 For the present invention Figure 5 Enlarged structural diagram at point D.

[0026] Figure 8 This is a partial structural diagram of the prefabricated connection of the closed-section thin-walled UHPC component of the present invention. Figure 1

[0027] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point E in the middle.

[0028] Figure 10 For the present invention Figure 8 Enlarged structural diagram at point F.

[0029] Figure 11 This is a schematic diagram of the prefabricated connection structure of the closed-section thin-walled UHPC component of the present invention. Figure 2 .

[0030] Reference numerals: 101-Precast column; 102-Supporting steel column; 103-Supporting steel plate; 104-Stiffening rib one; 105-Sleeve; 106-High-strength steel mesh one; 107-Connecting steel plate one; 108-Connecting steel plate two; 109-Stud one; 110-Shear key one; 111-Socket connector; 112-Socket connector groove; 201-Precast beam; 202-High-strength steel mesh two; 203-Connecting steel plate three; 204-Connecting steel plate four; 205-Connecting steel plate five; 206-Stud two; 207-Shear key two; 208-Stiffening rib two. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example: Figures 1-11As shown, this invention proposes a prefabricated connection for closed-section thin-walled UHPC components, including a precast column 101 and a precast beam 201 cast from UHPC material. The precast column 101 contains a high-strength steel mesh 106, and the precast beam 201 contains a high-strength steel mesh 202. Both ends of the precast column 101 have embedded first steel structures, and both ends of the precast beam 201 have embedded second steel structures. A socket-type connecting groove 112 is provided on the first steel structure at one end of the precast column 101, and a socket-type connector 111 is provided on the first steel structure at the other end of the precast column 101. The precast column 101 is connected to the supporting steel column 102 through the first and second steel structures. The connection between two adjacent precast columns 101 in the vertical direction is achieved through the socket-type connecting groove 112 on the first steel structure of one precast column 101 and the socket-type connector 111 on the first steel structure of another precast column 101.

[0033] The first steel structure includes a sleeve 105 and a connecting steel plate 108. The connecting steel plate 108 is embedded in the end of the precast column 101 and connected to the high-strength steel mesh 106. Multiple studs 109 and multiple shear keys 110 are provided on the side of the connecting steel plate 108 near the high-strength steel mesh 106. The sleeve 105 is fixedly installed on the connecting steel plate 108. A socket-type connecting groove 112 is provided on the sleeve 105 at one end of the precast column 101. A socket-type connector 111 is fixedly installed on the sleeve 105 at the other end of the precast column 101. A connecting steel plate 107 is fixedly installed on both sides of each face of each sleeve 105.

[0034] The second steel structure includes a connecting steel plate 205, which is embedded in the end of the precast beam 201 and connected to the high-strength steel mesh 202. Connecting steel plates 203 are provided at both ends of the connecting steel plate 205. Multiple shear keys 207 are fixedly provided on the side of each connecting steel plate 203 near the high-strength steel mesh 202. Multiple stiffening ribs 208 are fixedly provided between the side of each connecting steel plate 203 away from the high-strength steel mesh 202 and the connecting steel plate 205. Connecting steel plates 204 are provided on both sides of the connecting steel plate 205.

[0035] Connecting steel plate 3 (203) is connected to connecting steel plate 2 (108) by high-strength bolts, and connecting steel plate 4 (204) is connected to connecting steel plate 1 (107) by high-strength bolts.

[0036] One end of the precast column 101, which is used for installation on the construction ground, is replaced with a pre-embedded first steel structure, and the precast column 101 is installed on the construction ground through the support steel structure.

[0037] The supporting steel structure includes a supporting steel column 102, which is embedded in the end of the precast column 101. A supporting steel plate 103 is fixedly installed at the end of the supporting steel column 102 away from the precast column 101. Multiple stiffening ribs 104 are provided between the supporting steel plate 103 and the supporting steel column 102. The supporting steel plate 103 is connected to the construction ground through multiple bolt holes 5 by high-strength bolts.

[0038] A grouting channel for injecting grout is provided at the connection between the precast column 101 and the supporting steel column 102.

[0039] Multiple bolt holes 1 are provided on connecting steel plate 208. Multiple bolt holes 2 matching bolt holes 2 are provided on the side of connecting steel plate 3 203 away from high-strength steel mesh 202. Multiple bolt holes 3 are provided on connecting steel plate 107. Multiple bolt holes 4 matching bolt holes 2 are provided on connecting steel plate 4. Bolt holes 1 and 2, and bolt holes 3 and 4 are all connected by high-strength bolts.

[0040] This invention also proposes a construction method for prefabricated connection of closed-section thin-walled UHPC components, comprising the following steps:

[0041] S1. Preparation of closed-section thin-walled UHPC components: According to the design drawings, multiple closed-section thin-walled precast columns 101 and precast beams 201 are cast using UHPC material. Among them, the precast columns 101 are equipped with a high-strength steel mesh 106, and the precast beams 201 are equipped with a high-strength steel mesh 202. Both ends of the precast columns 101 are pre-embedded with a first steel structure, and both ends of the precast beams 201 are pre-embedded with a second steel structure. A socket-type connecting groove 112 is provided on the first steel structure at one end of the precast column 101, and a socket-type connector 111 is provided on the first steel structure at the other end of the precast column 101.

[0042] S2. Design of component connection nodes: The connection between the precast column 101 and the supporting steel column 102 is achieved through the first steel structure and the second steel structure. The socket connection between two adjacent precast columns 101 in the vertical direction is achieved through the socket-type connection groove 112 on the first steel structure of one precast column 101 and the socket-type connector 111 on the first steel structure of another precast column 101.

[0043] S3. On-site assembly: The precast column 101 and the supporting steel column 102 are transported to the construction site and assembled and connected by high-strength bolts.

[0044] S4. Grouting of the node area: After the assembly is completed, the connection node between the precast column 101 and the supporting steel column 102 is grouted, and an anti-corrosion coating is applied to the exposed metal parts.

[0045] S5. Quality Inspection: Inspect the appearance, dimensions, and strength of the connection nodes between the precast column 101 and the supporting steel column 102 to ensure they meet the requirements.

[0046] The weight ratio of UHPC material in S1 is: 35% cement, 28% quartz sand, 10% silica fume, 8% fly ash, 5% mineral powder, 1.8% water-reducing agent, and 4% steel fiber; the water-cement ratio is 0.18.

[0047] When preparing UHPC material closed-section thin-walled precast column 101 and precast beam 201 components: according to the structural design requirements, steel molds are made, and the inner surface of the molds needs to be polished to ensure the surface smoothness of the components after demolding; a forced mixer is used for mixing, first dry mixing cement, sand, silica fume, fly ash, and mineral powder for 2 minutes; then water and water-reducing agent are added and mixed for 3 minutes; finally, steel fibers are added in batches and mixed for 5-7 minutes until the steel fibers are evenly dispersed.

[0048] Positioning and installation of embedded parts: In this embodiment, a high-strength steel mesh 202 is configured inside the precast beam 201, and connecting steel plates 205 are embedded at both ends of the precast beam 201; a sleeve 105 is configured inside the precast column 101, and connecting steel plates 108 are embedded at both ends of the precast column 101. Before embedding, multiple studs 109 are welded at the contact surface between the connecting steel plates 108 and the precast column 101UHPC, and multiple studs 209 are welded at the contact surface between the connecting steel plates 205 and the precast beam 201UHPC. 206. To enhance mechanical interlocking force, multiple bolt holes 1 are opened on connecting steel plate 208, multiple bolt holes 2 matching bolt holes 2 are opened on the side of connecting steel plate 3 203 away from high-strength steel mesh 202, multiple bolt holes 3 are opened on connecting steel plate 107, and multiple bolt holes 4 matching bolt holes 2 are opened on connecting steel plate 4. Each bolt hole contains a threaded sleeve, and each sleeve is plug-welded to its corresponding steel plate. All embedded parts are fixed to the mold by positioning brackets, with installation errors controlled within ±1.5mm. During pouring, a layered pouring process is adopted, with each layer not exceeding 200mm in thickness, supplemented by high-frequency vibration to ensure compaction, especially ensuring the filling quality of the concrete around the embedded parts.

[0049] Curing and Demolding: After pouring, immediately cover with a curing film to retain moisture and let stand at 20±5℃ for 24 hours. Then, steam cure at 90℃ for 48 hours, with a heating rate not exceeding 15℃ / hour. After demolding, clean and remove slag and rust from the surface of the embedded steel plate, and apply epoxy zinc-rich primer for temporary corrosion protection.

[0050] On-site measurement and positioning: At the construction site, the axis and control lines are first measured and laid out on the foundation structure of the construction ground, and the three-dimensional coordinates are verified using a total station.

[0051] Lifting and Positioning: Tower cranes or truck cranes are used for lifting components. One end of the precast column 101 to be installed on the construction ground is replaced with a precast support steel structure. The precast column 101 is then installed on the construction ground through the support steel structure, and grouting is used to reinforce the connection between the support steel column 102, the support steel plate 103 and the construction ground. After the precast column 101 is in place, it is temporarily fixed by adjustable diagonal braces to correct its verticality. When lifting the precast beam 201, it needs to be lowered slowly to align bolt hole one with bolt hole two, and bolt hole three with bolt hole four.

[0052] High-strength bolt connection: In this embodiment, M20 friction-type high-strength bolts of grade 10.9 are used for connection. Temporary mounting bolts are used for initial fixing during installation, and then replaced with high-strength bolts. Bolt tightening is divided into two steps: initial tightening and final tightening. The initial tightening torque is 50% of the final tightening torque, and the final tightening torque is set to 400 N·m according to the design requirements. All bolts must be tightened with a torque wrench and symmetrically tightened from the center outward to ensure a tight fit between the connection surfaces.

[0053] When grouting the node area in S4: In this embodiment, a detachable steel formwork is set at the node according to the node outline of the precast column 101 and the precast beam 201, and a grouting port is set. A rubber sealing strip is pasted on the inside and fixed with expansion bolts. A waterstop is wrapped around the joint of the steel formwork. The grouting material is non-shrink cement-based grouting material (strength grade C80, fluidity ≥300mm). A special grouting pump is used to press in the grouting from the bottom grouting port. The grouting pressure is maintained at 0.3-0.4MPa. After the top grouting port continuously flows out homogeneous grout, the grouting port is sealed.

[0054] Corrosion and fire protection treatment: All exposed metal connectors (embedded steel plates, high-strength bolts) undergo final corrosion protection treatment: one coat of epoxy micaceous iron oxide intermediate paint with a dry film thickness of 60μm; followed by one coat of acrylic polyurethane topcoat with a dry film thickness of 40μm. According to the building's fire resistance rating requirements, a thick fire-retardant coating is applied to the joint areas to ensure that the steel components meet the design fire resistance limit.

Claims

1. A prefabricated connection for a closed-section thin-walled UHPC component, characterized in that, The precast column (101) and precast beam (201) are made of UHPC material and have a closed thin-walled section. The precast column (101) contains a high-strength steel mesh (106), and the precast beam (201) contains a high-strength steel mesh (202). Both ends of the precast column (101) have embedded first steel structures, and both ends of the precast beam (201) have embedded second steel structures. A socket-type connecting groove is provided on the first steel structure at one end of the precast column (101). 112), a socket-type connector (111) is provided on the first steel structure at the other end of the precast column (101). The connection between the precast column (101) and the supporting steel column (102) is realized through the first steel structure and the second steel structure. The connection between two adjacent precast columns (101) in the vertical direction is realized through the socket-type connector groove (112) on the first steel structure of one precast column (101) and the socket-type connector (111) on the first steel structure of another precast column (101).

2. The prefabricated connection of closed-section thin-walled UHPC components as described in claim 1, characterized in that, The first steel structure includes a sleeve (105) and a connecting steel plate two (108). The connecting steel plate two (108) is embedded in the end of the precast column (101) and connected to the high-strength steel mesh one (106). The connecting steel plate two (108) is provided with a plurality of studs one (109) and a plurality of shear keys one (110) on the side of the connecting steel plate two (108) close to the high-strength steel mesh one (106). The sleeve (105) is fixedly installed on the connecting steel plate two (108). The socket-type connecting groove (112) is installed on the sleeve (105) at one end of the precast column (101). The socket-type connector (111) is fixedly installed on the sleeve (105) at the other end of the precast column (101). The connecting steel plate one (107) is fixedly installed on both sides of each face of each sleeve (105).

3. The prefabricated connection of closed-section thin-walled UHPC components as described in claim 2, characterized in that, The second steel structure includes a connecting steel plate five (205), which is embedded in the end of the precast beam (201) and connected to the high-strength steel mesh two (202). Connecting steel plates three (203) are provided at both ends of the connecting steel plate five (205). Multiple shear keys two (207) are fixedly provided on the side of each connecting steel plate three (203) close to the high-strength steel mesh two (202). Multiple stiffening ribs two (208) are fixedly provided between the side of each connecting steel plate three (203) away from the high-strength steel mesh two (202) and the connecting steel plate five (205). Connecting steel plates four (204) are provided on both sides of the connecting steel plate five (205).

4. The prefabricated connection of closed-section thin-walled UHPC components as described in claim 3, characterized in that, The third connecting steel plate (203) is connected to the second connecting steel plate (108) by high-strength bolts, and the fourth connecting steel plate (204) is connected to the first connecting steel plate (107) by high-strength bolts.

5. The prefabricated connection of a closed-section thin-walled UHPC component as described in claim 1, characterized in that, One end of the precast column (101) to be installed on the construction ground is replaced with a pre-embedded first steel structure, and the precast column (101) is installed on the construction ground through the pre-embedded support steel structure.

6. The prefabricated connection of a closed-section thin-walled UHPC component as described in claim 5, characterized in that, The supporting steel structure includes a supporting steel column (102), which is embedded in the end of the precast column (101). A supporting steel plate (103) is fixedly installed at the end of the supporting steel column (102) away from the precast column (101). Multiple stiffening ribs (104) are provided between the supporting steel plate (103) and the supporting steel column (102). The supporting steel plate (103) is connected to the construction ground by high-strength bolts through multiple bolt holes.

7. The prefabricated connection of a closed-section thin-walled UHPC component as described in claim 1, characterized in that, A grouting channel for injecting grout is provided at the connection between the precast column (101) and the supporting steel column (102).

8. The prefabricated connection of closed-section thin-walled UHPC components as described in claim 3, characterized in that, The connecting steel plate 2 (108) has multiple bolt holes 1. The connecting steel plate 3 (203) has multiple bolt holes 2 that match the bolt holes 1 on the side away from the high-strength steel mesh 2 (202). The connecting steel plate 1 (107) has multiple bolt holes 3. The connecting steel plate 4 (204) has multiple bolt holes 4 that match the bolt holes 2. The bolt holes 1 and 2, and the bolt holes 3 and 4 are all connected by high-strength bolts.

9. A construction method for prefabricated connection of closed-section thin-walled UHPC components as described in claim 1, characterized in that, Includes the following steps: S1. Preparation of closed thin-walled UHPC components: Prepare multiple closed thin-walled precast columns (101) and precast beams (201) cast from UHPC material. The precast columns (101) are equipped with a high-strength steel mesh I (106), and the precast beams (201) are equipped with a high-strength steel mesh II (202). Both ends of the precast columns (101) are pre-embedded with a first steel structure, and both ends of the precast beams (201) are pre-embedded with a second steel structure. A socket-type connecting groove (112) is provided on the first steel structure at one end of the precast columns (101), and a socket-type connector (111) is provided on the first steel structure at the other end of the precast columns (101). S2, Design component connection nodes: The connection between the precast column (101) and the supporting steel column (102) is realized through the first steel structure and the second steel structure. The socket connection between two adjacent precast columns (101) in the vertical direction is realized through the socket connection groove (112) on the first steel structure of one precast column (101) and the socket connection head (111) on the first steel structure of another precast column (101). S3. On-site assembly: The precast column (101) and the supporting steel column (102) are transported to the construction site and assembled and connected by high-strength bolts; S4. Grouting of the node area: After the assembly is completed, the connection node between the precast column (101) and the supporting steel column (102) is grouted, and an anti-corrosion coating is applied to the exposed metal parts. S5. Quality Inspection: Inspect the appearance, dimensions and strength of the connection nodes between the precast column (101) and the supporting steel column (102) to ensure that they meet the requirements.

10. The construction method for prefabricated connection of closed-section thin-walled UHPC components as described in claim 9, characterized in that, The weight ratio of the UHPC material in S1 is: 35% cement, 28% quartz sand, 10% silica fume, 8% fly ash, 5% mineral powder, 1.8% water-reducing agent, and 4% steel fiber; the water-cement ratio is 0.18.

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