Prefabricated UHPC thin-shell tubular column structure and manufacturing method

Abstract

The invention discloses a prefabricated UHPC thin-shell tubular column structure and a manufacturing method, the prefabricated UHPC thin-shell tubular column structure comprises an outer mold, an upper cylinder connecting structure, a lower cylinder connecting structure, a fishbone support, an elastic supporting structure and stirrups, the upper cylinder connecting structure and the lower cylinder connecting structure are connected through the outer mold, and the upper cylinder connecting structure and the lower cylinder connecting structure are arranged at the two ends of the outer mold; the elastic supporting structure is arranged on the inner side of the outer mold through the fishbone support, the two ends of the elastic supporting structure and the two ends of the fishbone support are fixedly connected with the upper cylinder connecting structure and the lower cylinder connecting structure respectively, the elastic supporting structure and the outer mold are arranged in a spaced mode, and the hoop is arranged between the elastic supporting structure and the outer mold. By means of the outer mold, the upper cylinder connecting structure, the lower cylinder connecting structure, the fishbone support, the elastic supporting structure and the stirrups, stable supporting and convenient dismounting are achieved, and the beneficial effects that the supporting stability is improved, the connecting structure is simplified, the inner mold is convenient to dismount, and the construction efficiency is improved are achieved. And therefore, the construction efficiency and the member quality are improved.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated concrete structures, and specifically relates to a prefabricated UHPC thin-shell tube column structure and its manufacturing method. Background Technology

[0002] Prefabricated structures significantly improve construction efficiency and quality control through standardized prefabrication of components in factories and on-site assembly. Factory production leverages precise mechanical processing to reduce human error, ensuring component accuracy and stability. In terms of environmental protection and energy conservation, centralized production effectively reduces on-site construction waste and material waste, while controlling dust and noise pollution. Prefabricated components are recyclable, meeting green building standards. High-performance concrete, as a revolutionary engineering material, possesses characteristics such as ultra-high strength, structural weight reduction, and excellent workability, making it suitable for casting complex shapes and integral molding. However, in the practical application of prefabricated UHPC thin-shell tube column structures, traditional internal formwork support systems have significant shortcomings: poor support structure stability, easily leading to deformation during concrete pouring and affecting component accuracy; complex connection structure design, increasing construction difficulty and reducing assembly efficiency; cumbersome internal formwork removal process, easily damaging the structural surface, making efficient and reliable industrial production difficult. These problems restrict the promotion and performance optimization of UHPC thin-shell tube column structures in engineering practice. Summary of the Invention

[0003] The purpose of this invention is to provide a prefabricated UHPC thin-shell tube column structure and its manufacturing method to overcome the shortcomings of the prior art. This invention has the advantages of improving support stability, simplifying connection structure, and facilitating the removal of inner mold, thereby improving construction efficiency and component quality.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A precast UHPC thin-shell tube column structure includes an outer mold, an upper cylindrical connecting structure, a lower cylindrical connecting structure, a herringbone support, an elastic support structure, and stirrups. The upper and lower cylindrical connecting structures are connected through the outer mold and are located at both ends of the outer mold. The elastic support structure is located inside the outer mold via a herringbone support. The two ends of the elastic support and the herringbone support are fixedly connected to the upper and lower cylindrical connecting structures, respectively. The elastic support structure is spaced apart from the outer mold, and stirrups are installed between the elastic support structure and the outer mold. Stirrups are installed between the elastic support structure and the outer mold for pouring concrete.

[0005] Preferably, the elastic support structure is made of elastic rough cloth; the hoop is made of spiral stirrups.

[0006] Preferably, the outer mold includes two semi-circular templates that can be spliced ​​together. Bolt holes are provided on the outer wall of the semi-circular templates. The connecting ends of the two semi-circular templates are provided with a tongue and groove connection structure. The bolt holes on the outer wall of the semi-circular templates are used to connect with the upper cylindrical connection structure and the lower cylindrical connection structure.

[0007] Preferably, the upper cylindrical connecting structure includes an outer ring convex connecting plate, an upper cylinder, and an inner ring fixing plate. The outer ring convex connecting plate is fixed to one end of the upper cylinder, and the upper inner ring is fixed to the other end of the upper cylinder.

[0008] Preferably, the outer ring protrusion connecting plate, the upper cylinder, and the upper inner ring fixing plate are integrally formed. The width of the outer ring protrusion connecting plate is the same as the wall thickness of the prefabricated UHPC thin-shell column structure. The outer ring protrusion connecting plate is provided with a UHPC casting port and a vent. The outer edge of the outer ring protrusion connecting plate is provided with an annular protrusion, and the outer ring protrusion is provided with a horizontal connecting bolt hole.

[0009] Preferably, the upper inner ring is provided with a U-shaped buckle and an arc buckle. The U-shaped buckle is used to fix the tensioned elastic rough cloth, and the arc buckle is used to fix the fishbone support.

[0010] Preferably, the lower cylinder connection structure includes an outer ring recessed connecting plate, a lower cylinder, and a lower inner ring fixing plate. The outer ring recessed connecting plate is fixed to one end of the lower cylinder, and the lower inner ring fixing plate is fixed to the other end of the lower cylinder.

[0011] Preferably, the outer ring recessed connecting plate, the lower cylinder, and the lower inner ring fixing plate are integrally formed. The width of the outer ring recessed connecting plate is the same as the wall thickness of the prefabricated UHPC thin-shell column structure. An annular groove is provided on the outer edge of the outer ring recessed connecting plate. Horizontal connecting bolt holes are provided on the outer ring groove.

[0012] Preferably, the fishbone support includes a steel pipe and arc-shaped reinforcing bars, with the arc-shaped reinforcing bars fixed to the steel pipe at intervals. The lower end of the steel pipe is provided with threads, and the upper end of the steel pipe is provided with arc-shaped buckles.

[0013] A method for fabricating a prefabricated UHPC thin-shell tube column structure includes the following steps: S1, prefabricated outer mold, upper cylindrical connecting structure, lower cylindrical connecting structure, the upper cylindrical connecting structure and the lower cylindrical connecting structure are connected by the outer mold; S2, the elastic support structure is tensioned, and then the tensioned elastic support structure is connected to the inner ring fixing plate of the upper cylindrical connection structure and the inner ring fixing plate of the lower cylindrical connection structure through U-shaped buckles, and installed between the upper cylindrical connection structure and the lower cylindrical connection structure. S3, prefabricated fishbone support, is installed inside the elastic support structure after installation. The upper end of the fishbone support is connected to the arc-shaped buckle of the inner ring fixing plate of the upper cylindrical connection structure, and the lower end is connected to the circular bolt hole of the inner ring fixing plate of the lower cylindrical connection structure. It plays a supporting role for the elastic support structure and forms the inner mold structure. S4, on-site installation: Stirrups are installed between the inner and outer molds. UHPC is poured through the pouring port of the upper cylindrical connection structure. After curing, the fishbone support and elastic support structure in the inner mold are removed to form a precast UHPC thin-shell tube column structure with keyways on the inner surface, an upper cylindrical connection structure and a lower cylindrical connection structure.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a precast UHPC thin-shell tube column structure, including an outer mold, an upper cylindrical connecting structure, a lower cylindrical connecting structure, a herringbone support, an elastic support structure, and stirrups. The upper and lower cylindrical connecting structures are connected through the outer mold and are located at both ends of the outer mold. The elastic support structure is located inside the outer mold via a herringbone support. The two ends of the elastic support and the herringbone support are fixedly connected to the upper and lower cylindrical connecting structures, respectively. The elastic support structure is spaced apart from the outer mold, and stirrups are placed between the elastic support structure and the outer mold. After stirrups are placed between the elastic support structure and the outer mold, concrete is poured. By including the outer mold, upper cylindrical connecting structure, lower cylindrical connecting structure, herringbone support, elastic support structure, and stirrups, stable support and convenient dismantling are achieved. It has the advantages of improving support stability, simplifying the connection structure, and facilitating the removal of the inner mold, thereby improving construction efficiency and component quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a prefabricated UHPC thin-shell tube column structure in a specific embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the outer mold structure in a specific embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the upper cylindrical connection structure in a specific embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the outer ring convex connecting plate structure in a specific embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the upper cylindrical structure in a specific embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the upper inner ring fixing plate structure in a specific embodiment of the present invention.

[0021] Figure 7 This is a schematic diagram of the lower cylindrical connection structure in a specific embodiment of the present invention.

[0022] Figure 8 This is a schematic diagram of the end face structure of the outer ring recessed connecting plate in a specific embodiment of the present invention.

[0023] Figure 9 This is a schematic diagram of the lower cylindrical structure in a specific embodiment of the present invention.

[0024] Figure 10 This is a schematic diagram of the lower inner ring fixing plate structure in a specific embodiment of the present invention.

[0025] Figure 11 This is a schematic diagram of the fishbone support structure in a specific embodiment of the present invention.

[0026] Figure 12 This is a schematic diagram of the elastic support structure in a specific embodiment of the present invention.

[0027] In the diagram, 1. Outer mold; 2. Upper cylindrical connecting structure; 3. Lower cylindrical connecting structure; 4. Fishbone support; 5. Elastic support structure; 6. UHPC; 7. Stirrups; 11. Bolt holes; 12. Semi-circular template; 13. Tongue and groove connection structure; 21. Outer ring protrusion connecting plate; 22. Upper cylinder; 23. Upper inner ring fixing plate; 211. UHPC pouring port; 212. Vent; 213. Outer edge annular protrusion; 214. Horizontal connecting bolt holes; 22. 1. Corrugated steel plate; 231. U-shaped buckle; 232. Arc buckle; 31. Outer ring recessed connecting plate; 32. Lower cylinder; 33. Lower inner ring fixing plate; 311. Annular groove; 312. Horizontal connecting bolt hole; 321. Corrugated steel plate; 331. Circular threaded hole; 332. Open circular threaded hole; 41. Steel pipe; 42. Arc reinforcing bar; 43. Threaded at the lower end; 44. Arc buckle at the upper end; 51. Rough surface molding structure composed of rubber material. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] like Figure 1 As shown, this invention provides a prefabricated UHPC thin-shell tube column structure, specifically including an outer mold 1, an upper cylindrical connecting structure 2, a lower cylindrical connecting structure 3, a herringbone support 4, an elastic support structure 5, and stirrups 7. The upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3 are connected through the outer mold 1 and are located at both ends of the outer mold 1. The elastic support structure 5 is located inside the outer mold 1 through the herringbone support 4. The two ends of the elastic support structure 5 and the herringbone support 4 are respectively fixedly connected to the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3. The elastic support structure 5 is spaced apart from the outer mold 1. Stirrups 7 are placed between the elastic support structure 5 and the outer mold 1. After the stirrups 7 are placed between the elastic support structure 5 and the outer mold 1, ultra-high performance concrete (UHPC) is used to pour a precast UHPC thin-shell tube column structure. In a specific embodiment of the present invention, UHPC is poured through the pouring port of the upper cylindrical connecting structure. After curing, the herringbone support and elastic rough cloth in the inner mold are removed, forming a precast UHPC thin-shell tube column structure with keyways on the inner surface, an upper cylindrical connecting structure, and a lower cylindrical connecting structure. This can effectively control the construction quality of the connection area of ​​the precast components, while reducing project costs and simplifying the construction process. At the same time, the mold can be reused multiple times, making it green, low-carbon, and environmentally friendly.

[0031] In a specific embodiment of the present invention, the outer mold 1 can be formed by connecting multiple arc-shaped plate segments with bolts or clips, while the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3 are fixed to the ends of the outer mold 1 by flanges or threads. Alternatively, the outer mold 1 and the connecting structures can be connected by welding or integral molding to form an integral external frame.

[0032] In a specific embodiment of the invention, the elastic support structure 5 is specifically made of elastic rough cloth; the stirrups 7 are spiral stirrups. The elastic support structure 5 is set inside the outer mold 1 via a herringbone support 4. As an inner mold, the shape and size of the elastic support structure 5 directly determine the inner surface morphology of the column. The function of the herringbone support 4 is to provide stable internal support for the elastic support structure 5, preventing it from deforming during tensioning or casting. For example, the elastic support structure 5 can be an expandable flexible material, which is made to fit tightly against the herringbone support 4 by internal inflation or mechanical tensioning. The herringbone support 4 can be composed of a series of radial support rods and circumferential connectors to provide uniform support force. The two ends of the elastic support structure 5 and the herringbone support 4 are fixedly connected to the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3, respectively. This fixed connection method ensures the positional accuracy and stability of the inner mold system throughout the prefabrication process. For example, the two ends of the elastic support structure 5 can be fixed to the inner edges of the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3 by clamps or adhesives. The two ends of the fishbone support 4 can be connected to the reserved interfaces on the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3 by means of bolts, pins or welding.

[0033] In a specific embodiment of the present invention, the length of the outer mold 1 is used to determine the height of the prefabricated UHPC thin-shell column structure. The elastic support structure 5 is fixed at both ends to the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3 after tensioning. The fishbone support 4 is set inside the elastic support structure 5 to form an inner membrane structure inside the outer mold 1.

[0034] A UHPC pouring port is provided on the upper cylindrical connecting structure 2. After the UHPC pouring and curing are completed, the fishbone support 4 and the elastic rough cloth 5 are removed. The poured UHPC forms a precast UHPC thin-shell tube column structure with keyways on the inner surface, upper cylindrical connecting structure 2 and lower cylindrical connecting structure 3.

[0035] In a specific embodiment of the present invention, such as Figure 2 As shown, the outer mold 1 includes two semi-circular templates 12 that can be spliced ​​together. Bolt holes 11 are provided on the outer wall of the semi-circular templates 12. The connecting ends of the two semi-circular templates 12 are provided with tongue and groove connection structures 13. The bolt holes 11 on the outer wall of the semi-circular templates 12 are used to connect with the upper cylindrical connection structure 2 and the lower cylindrical connection structure 3.

[0036] In a specific embodiment of the present invention, such as Figure 3 , Figure 4As shown, the upper cylindrical connecting structure 2 includes an outer ring protrusion connecting plate 21, an upper cylinder 22, and an upper inner ring fixing plate 23. The outer ring protrusion connecting plate 21 is fixed to one end of the upper cylinder 22, and the upper inner ring fixing plate 23 is fixed to the other end of the upper cylinder 22. In a specific embodiment of the present invention, the outer ring protrusion connecting plate 21, the upper cylinder 22, and the upper inner ring fixing plate 23 are integrally formed. The width of the outer ring protrusion connecting plate 21 is the same as the wall thickness of the prefabricated UHPC thin-shell tube column structure. The outer ring protrusion connecting plate 21 has a UHPC casting port 211 and a vent 212. The outer edge of the outer ring protrusion connecting plate 21 is provided with an annular protrusion 213, and the outer ring protrusion 213 is provided with a horizontal connecting bolt hole 214.

[0037] In a specific embodiment of the present invention, the outer ring protrusion connecting plate has a thickness of 5mm and a protrusion of 3mm.

[0038] In a specific embodiment of the present invention, such as Figure 5 As shown, the upper cylinder 22 is specifically made of corrugated steel plate 221, which can increase the bonding strength between UHPC and internal concrete.

[0039] like Figure 6 As shown, the upper inner ring fixing plate 23 is provided with a U-shaped buckle 231 and an arc buckle 232. The U-shaped buckle 231 is used to fix the elastic rough cloth 5 after tensioning, and the arc buckle 232 is used to fix the fishbone support 4.

[0040] In a specific embodiment of the present invention, such as Figures 7 to 10 As shown, the lower cylindrical connecting structure 3 includes an outer ring recessed connecting plate 31, a lower cylinder 32, and a lower inner ring fixing plate 33. The outer ring recessed connecting plate 31 is fixed to one end of the lower cylinder 32, and the lower inner ring fixing plate 33 is fixed to the other end of the lower cylinder 32. The outer ring recessed connecting plate 31, the lower cylinder 32, and the lower inner ring fixing plate 33 are integrally formed. The width of the outer ring recessed connecting plate 31 is the same as the wall thickness of the prefabricated UHPC thin-shell column structure. An annular groove 311 is provided on the outer edge of the outer ring recessed connecting plate 311. Horizontal connecting bolt holes 312 are provided on the outer ring groove 311. The lower cylinder 32 is specifically made of corrugated steel plate 321 to increase the bonding strength between the UHPC and the internal concrete. The lower inner ring fixing plate 33 is provided with a circular threaded hole 331 and an open circular threaded hole 332. The circular threaded hole 331 is used to fix the tensioned elastic rough cloth 5, and the open circular threaded hole 332 is used to fix the fishbone support 4.

[0041] In a specific embodiment of the present invention, the outer ring recessed connecting plate has a thickness of 5mm and the groove has a thickness of 3mm. In a specific embodiment of the present invention, such as Figure 11As shown, the fishbone support 4 includes a steel pipe 41 and arc-shaped reinforcing bars 42. The arc-shaped reinforcing bars 42 are fixed to the steel pipe 41 at intervals. The lower end of the steel pipe 41 is provided with threads 43, and the upper end of the steel pipe 41 is provided with arc-shaped buckles 44. Figure 12 As shown, the elastic rough cloth 5 is composed of a rubber material with a roughened surface structure 51. The arc-shaped steel bar 42 is specifically a 1 / 4 arc-shaped steel bar.

[0042] In another embodiment of the present invention, a method for manufacturing a prefabricated UHPC thin-shell tubular structure is provided, specifically including the following steps: S1, prefabricated outer mold 1, upper cylindrical connecting structure 2, lower cylindrical connecting structure 3. The outer mold 1 specifically includes two semi-circular templates. The two semi-circular templates are connected by tongue and groove at the ends to form a circular outer mold. The outer mold is then connected to the outer ring convex bolt holes of the upper cylindrical connecting structure and the outer ring concave bolt holes of the lower cylindrical connecting structure through bolt holes at both ends.

[0043] S2, the elastic support structure is tensioned, and then the tensioned elastic support structure is connected to the inner ring fixing plate of the upper cylindrical connection structure and the inner ring fixing plate of the lower cylindrical connection structure through U-shaped buckles, and installed between the upper cylindrical connection structure and the lower cylindrical connection structure.

[0044] S3, prefabricated fishbone support, is installed inside the elastic support structure after installation. The upper end of the fishbone support is connected to the arc-shaped buckle of the inner ring fixing plate of the upper cylindrical connecting structure, and the lower end is connected to the circular bolt hole of the inner ring fixing plate of the lower cylindrical connecting structure. It plays a supporting role for the elastic support structure and forms the inner mold.

[0045] S4, on-site installation: Stirrups are installed between the inner and outer molds. UHPC is poured through the pouring port of the upper cylindrical connection structure. After curing, the fishbone support and elastic support structure in the inner mold are removed to form a precast UHPC thin-shell tube column structure with keyways on the inner surface, an upper cylindrical connection structure and a lower cylindrical connection structure.

[0046] In a specific embodiment of the invention, the elastic support structure 5 and the outer mold 1 are spaced apart. This space forms an annular space for the casting of the UHPC. The size of the space determines the wall thickness of the UHPC thin-shell column. This space is precisely controlled by setting positioning blocks or shims on the inside of the outer mold 1 or on the outside of the elastic support structure 5. Alternatively, the distance between the elastic support structure 5 and the outer mold 1 can be indirectly controlled by adjusting the radial dimension of the herringbone support 4.

[0047] After the elastic support structure 5 and the outer mold 1 are connected by stirrups 7, concrete is poured. Once the stirrups 7 are in place, UHPC grout is injected into the annular space between the elastic support structure 5 and the outer mold 1. The high fluidity of UHPC allows it to fully fill this space and densely encapsulate the stirrups 7. After pouring, the UHPC is cured under the constraints of the inner and outer molds, ultimately forming a UHPC thin-shell tube column structure with high strength and durability.

[0048] Through the above process, the prefabricated UHPC thin-shell tube column structure is completed efficiently and precisely in the factory. During on-site construction, these prefabricated tube columns only need to be hoisted and connected, which greatly shortens the construction period and reduces the complexity and labor intensity of on-site operations. At the same time, the excellent properties of UHPC material, combined with this unique internal and external mold and support system, ensure the structural integrity and high load-bearing capacity of the tube columns.

[0049] This application specifically sets the elastic support structure 5 as an elastic rough cloth. Its elastic properties enable it to withstand and evenly distribute the lateral pressure of the UHPC during casting, avoiding localized stress concentration and thus maintaining the stability and shape of the inner mold. Simultaneously, the rough surface of the elastic rough cloth forms numerous microscopic mechanical interlocking points when in contact with the UHPC slurry, significantly enhancing the adhesion between the UHPC and the inner mold, preventing delamination or voids during hardening, and ensuring the compactness of the UHPC thin shell. When the stirrups 7 are spiral stirrups, their continuous spiral shape forms a continuous constraint loop in the UHPC thin shell column structure. This continuous constraint effectively limits the lateral expansion of the UHPC under compression, thereby significantly improving the compressive strength and ductility of the UHPC. Compared with traditional stirrups, the continuity of the spiral stirrups avoids weak points at stirrup overlaps, resulting in superior integrity and shear resistance of the entire column structure when subjected to axial loads and bending moments. The elastic roughened fabric serves as the support material for the inner mold, its rough surface tightly bonding with the UHPC, providing a stable casting environment for the helical stirrups. The helical stirrups then form a continuous skeleton between the elastic roughened fabric and the outer mold 1, together constituting a high-strength, high-toughness UHPC thin shell. This combination ensures that the UHPC receives sufficient constraint and support during casting and hardening, guaranteeing high-quality forming of the UHPC thin-shell tube column structure and significantly improving its load-bearing capacity and seismic performance.

[0050] In one specific implementation, the elastic support structure 5 can be made of an elastic rough fabric woven from high-molecular polymer fibers (such as polyvinyl alcohol fibers or ultra-high molecular weight polyethylene fibers). The surface of this fabric is treated with flocking or a special coating to form a micron-level rough texture, maximizing interfacial friction and adhesion with the UHPC. The stirrups 7 can be made of HRB400 grade steel bars with a diameter of 8mm, continuously processed into a spiral shape with a pitch of 50mm using CNC bending equipment, ensuring that the lap length of the spiral stirrups meets the specification requirements to form a continuous restraint effect. During installation, the elastic rough fabric is first tensioned and fixed between the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3. Subsequently, the spiral stirrups 7 are precisely placed in the annular space between the elastic rough fabric and the outer mold 1, and the accuracy of their spacing and position is ensured by a positioning device, preparing for the subsequent UHPC pouring.

[0051] Through the above technical solution, the elastic support structure 5 uses elastic rough fabric, whose rough surface can significantly enhance the interfacial bonding with UHPC, effectively preventing delamination or voids in the UHPC during casting and hardening, and ensuring the density and molding quality of the UHPC thin shell. Simultaneously, the stirrups 7 use spiral stirrups, whose continuous restraint effect can significantly improve the compressive strength and ductility of the UHPC and effectively resist shear forces, thereby significantly improving the overall mechanical properties and durability of the precast UHPC thin shell column structure. This combination not only solves the problems of insufficient density and poor mechanical properties of UHPC that may be caused by traditional support structures and stirrups, but also enables the column structure to exhibit superior load-bearing capacity and seismic performance under complex stress conditions.

[0052] In one specific implementation, the outer mold 1 consists of two symmetrical semi-circular templates 12, the length of which matches the length of the UHPC thin-shell tube column structure. On the longitudinal edge of the semi-circular template 12, a raised tongue and groove are provided on one side, and a corresponding groove is provided on the other side, forming a tongue-and-groove connection structure 13. When the two semi-circular templates 12 are closed, the tongue and groove interlock tightly and are further secured by external clamps or bolts to ensure a strong connection. Multiple bolt holes 11 are evenly distributed along the circumference on the outer walls of the upper and lower ends of the semi-circular template 12. These bolt holes 11 are aligned with corresponding bolt holes on the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3. By inserting bolts and tightening nuts, the semi-circular template 12 is securely connected to the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3. For example, M12 or M16 bolts can be used for connection, with the diameter of the bolt hole 11 slightly larger than the bolt diameter for ease of installation. The depth and width of the tongue and groove connection structure 13 can be designed according to the flowability of UHPC and the pressure-bearing capacity of the mold to ensure a good sealing effect.

[0053] Through the above technical solution, the outer mold 1 is designed as two interlocking semi-circular templates 12, supplemented by a tongue-and-groove connection structure 13 and bolt holes 11. This effectively solves the problems of difficult installation, inconvenient demolding, and low transportation and storage efficiency that exist in the traditional integral mold during the prefabrication of large UHPC thin-shell tube column structures. The tongue-and-groove connection structure 13 ensures the accuracy and sealing of the mold splicing, avoids leakage of UHPC slurry, and ensures the smoothness of the outer surface of the tube column. The bolt holes 11 provide a reliable connection method with the upper cylindrical connection structure 2 and the lower cylindrical connection structure 3, ensuring the overall stability and dimensional accuracy of the mold. This split design greatly simplifies the assembly and disassembly process of the mold, improves construction efficiency, reduces labor costs, and extends the service life of the mold, thereby significantly improving the production efficiency and economic benefits of prefabricated UHPC thin-shell tube column structures.

[0054] In one specific implementation, the upper cylindrical connecting structure 2 is entirely made of high-strength steel. The outer ring convex connecting plate 21 can be designed with an annular flange, pre-drilled with bolt holes for fastening to the corresponding connecting holes on the top of the outer mold 1, thus achieving quick and reliable external positioning and sealing. The upper cylinder 22 can be a standard-sized seamless steel pipe section, its inner diameter matching the inner diameter design of the UHPC thin-shell tube column structure, and precision-machined to ensure dimensional accuracy. The inner ring fixing plate 23 can be an annular steel plate with multiple U-shaped slots and circular bolt holes evenly distributed along its inner edge. The U-shaped slots are used to engage the edges of the elastic support structure 5, while the circular bolt holes are used to fix the upper end of the herringbone support 4 with bolts. Both the outer ring convex connecting plate 21 and the inner ring fixing plate 23 can be securely connected to both ends of the upper cylinder 22 by full-circumference welding, forming a high-strength, high-rigidity integral component, facilitating on-site installation and disassembly.

[0055] In some embodiments described above in this application, a prefabricated UHPC thin-shell column structure is proposed, wherein the lower cylindrical connecting structure 3 is a key component connecting the outer mold 1 and the internal support structure. This application further proposes that the lower cylindrical connecting structure 3 includes an outer ring notch connecting plate 31, a lower cylinder 32, and an inner ring fixing plate 33. The outer ring notch connecting plate 31 is fixed to one end of the lower cylinder 32, and the inner ring fixing plate 33 is fixed to the other end of the lower cylinder 32. The lower cylindrical connecting structure 3 is a key component for connecting the outer mold 1 and the internal support structure (such as the herringbone support 4 and the elastic support structure 5), aiming to provide structural support, positioning, and forming the lower end interface of the UHPC column. This structure can be made of high-strength metallic materials (e.g., steel, aluminum alloy) or composite materials, formed by casting, welding, or machining. Its design must ensure that it can withstand the corresponding loads during the UHPC casting process and maintain precise geometry.

[0056] The outer ring recessed connecting plate 31 is part of the lower cylindrical connecting structure 3, characterized by a recessed structure designed to form a tight and precise connection with the outer mold 1. This connecting plate is typically annular or disc-shaped and can be cut, stamped, or cast from sheet metal. Its recessed design allows for snap-fitting, embedding, or alignment with the outer mold 1, thereby ensuring accurate installation and positioning of the outer mold 1 and effectively preventing leakage of UHPC grout from the connection point during casting.

[0057] This application refines the lower cylindrical connecting structure 3 into a combination of an outer ring notch connecting plate 31, a lower cylinder 32, and an inner ring fixing plate 33, and clarifies the fixing relationship between them, thereby constructing a functionally complete and structurally stable lower connecting unit. Specifically, the outer ring notch connecting plate 31 is fixed to one end of the lower cylinder 32, and its notch design forms a precise fit with the outer mold 1, allowing the outer mold 1 to be accurately positioned and securely connected to the lower cylindrical connecting structure 3. This connection method not only ensures the installation accuracy of the outer mold 1, but also effectively prevents leakage problems that may occur during the UHPC grout pouring process, thereby ensuring the smoothness and dimensional accuracy of the outer surface of the UHPC column. At the same time, the inner ring fixing plate 33 is fixed to the other end of the lower cylinder 32, providing a reliable anchoring point for the internal herringbone support 4 and elastic support structure 5. Through the inner ring fixing plate 33, the herringbone support 4 and elastic support structure 5 can be precisely installed and tensioned, thereby forming a stable inner mold structure during UHPC pouring and maintaining the required thickness of the UHPC layer. The lower cylinder 32, as the main body of the connecting structure, bears the loads transmitted by the connecting plate and the internal support structure, and maintains the geometry of the entire lower structure. This integrated and clearly defined design enables the lower cylinder connecting structure 3 to work efficiently with the outer mold 1 and the internal support structure to complete the precise molding of the UHPC thin-shell column. This effectively solves the problems of unstable connection and inaccurate positioning that may exist in traditional connecting structures, and significantly improves the manufacturing quality and efficiency of precast components.

[0058] This application integrates the outer ring recessed connecting plate 31, the lower cylinder 32, and the inner ring fixing plate 33 into a single unit in the lower cylindrical connecting structure 3, significantly improving the overall rigidity and strength of the connection structure and avoiding precision deviations and weak points that may result from the assembly of separate components. Simultaneously, the width of the outer ring recessed connecting plate 31 is precisely designed to match the wall thickness of the precast UHPC thin-shell column structure, ensuring a seamless transition between the metal connector and the UHPC pipe wall after UHPC casting. This allows for uniform load distribution, avoids stress concentration, and improves the overall load-bearing capacity and durability of the structure. Furthermore, an annular groove 311 is provided on the outer edge of the outer ring recessed connecting plate 31, and horizontal connecting bolt holes 312 are provided on this groove 311, providing a standardized and reliable external connection interface for the precast UHPC thin-shell column structure. The annular groove 311 not only serves as a positioning and shear key when connecting to other structures (such as foundations and adjacent column sections), but its internal horizontal bolt holes 312 also allow for mechanical connections via bolts, making on-site installation and connection processes more convenient, efficient, and robust. This design enables the lower cylindrical connection structure 3 to play a crucial load-bearing and connecting role in the UHPC thin-shell column structure, ensuring a stable connection between the entire column structure and the external environment.

[0059] This embodiment achieves efficient installation and non-destructive removal of the inner mold system through the coordinated design of the elastic support structure 5 and the herringbone support 4, combined with the overall connection mechanism of the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3. The elastic support structure 5 forms a stable inner mold under tension, the herringbone support 4 provides radial support to ensure geometric accuracy, and the fixed interface of the upper cylindrical connecting structure 2 and the lower cylindrical connecting structure 3 ensures system stability. After UHPC casting, the inner mold can be easily removed, avoiding the complex procedures and potential damage of traditional formwork removal. This technical solution not only simplifies the prefabrication process and significantly shortens on-site construction time but also reduces waste of formwork materials, while ensuring the integrity of the inner surface of the pipe column and the precise forming of the keyway structure, thereby improving overall construction efficiency and structural quality.

[0060] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

[0061] It should be noted that the above embodiment of the prefabricated UHPC thin-shell tube column structure and manufacturing method is only an illustration of the structure in practical application. The above structure can also be used in other application scenarios according to actual needs. The specific implementation process is similar to the above embodiment, and will not be repeated here.

[0062] The serial numbers in the above embodiments are for descriptive purposes only and do not represent the order in which the components are assembled or used.

[0063] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A prefabricated UHPC thin-shell tubular column structure, characterized in that, The structure includes an outer mold (1), an upper cylindrical connecting structure (2), a lower cylindrical connecting structure (3), a fishbone support (4), an elastic support structure (5), and stirrups (7). The upper cylindrical connecting structure (2) and the lower cylindrical connecting structure (3) are connected through the outer mold (1). The upper cylindrical connecting structure (2) and the lower cylindrical connecting structure (3) are located at both ends of the outer mold (1). The elastic support structure (5) is located inside the outer mold (1) through the fishbone support (4). The two ends of the elastic support structure (5) and the fishbone support (4) are fixedly connected to the upper cylindrical connecting structure (2) and the lower cylindrical connecting structure (3), respectively. The elastic support structure (5) is spaced apart from the outer mold (1). The stirrups (7) are located between the elastic support structure (5) and the outer mold (1). The stirrups (7) between the elastic support structure (5) and the outer mold (1) are used for pouring concrete.

2. The prefabricated UHPC thin-shell tube column structure according to claim 1, characterized in that, The elastic support structure (5) specifically adopts elastic rough cloth; the stirrups (7) adopt spiral stirrups.

3. The prefabricated UHPC thin-shell tube column structure according to claim 1, characterized in that, The outer mold (1) includes two semi-circular templates (12) that can be spliced ​​together. Bolt holes (11) are provided on the outer wall of the semi-circular templates (12). Tongue and groove connection structure (13) is provided at the connecting end of the two semi-circular templates (12). The bolt holes (11) on the outer wall of the semi-circular templates (12) are used to connect with the upper cylindrical connection structure (2) and the lower cylindrical connection structure (3).

4. The prefabricated UHPC thin-shell tube column structure according to claim 1, characterized in that, The upper cylindrical connecting structure (2) shown includes an outer ring protrusion connecting plate (21), an upper cylinder (22) and an upper inner ring fixing plate (23). The outer ring protrusion connecting plate (21) is fixed to one end of the upper cylinder (22), and the upper inner ring fixing plate (23) is fixed to the other end of the upper cylinder (22).

5. The prefabricated UHPC thin-shell tube column structure according to claim 4, characterized in that, The outer ring protrusion connecting plate (21), the upper cylinder (22) and the upper inner ring fixing plate (23) are integrally formed. The width of the outer ring protrusion connecting plate (21) is the same as the wall thickness of the prefabricated UHPC thin shell column structure. The outer ring protrusion connecting plate (21) is provided with a UHPC pouring port (211) and a vent (212). The outer edge of the outer ring protrusion connecting plate (21) is provided with an annular protrusion (213). The outer ring protrusion (213) is provided with a horizontal connecting bolt hole (214).

6. The prefabricated UHPC thin-shell tube column structure according to claim 4, characterized in that, The upper inner ring fixing plate (23) is provided with a U-shaped buckle (231) and an arc buckle (232). The U-shaped buckle (231) is used to fix the elastic rough cloth (5) after tensioning, and the arc buckle (232) is used to fix the fishbone support (4).

7. The prefabricated UHPC thin-shell tube column structure according to claim 1, characterized in that, The lower cylindrical connecting structure (3) includes an outer ring recessed connecting plate (31), a lower cylindrical cylinder (32) and a lower inner ring fixing plate (33). The outer ring recessed connecting plate (31) is fixed to one end of the lower cylindrical cylinder (32), and the lower inner ring fixing plate (33) is fixed to the other end of the lower cylindrical cylinder (32).

8. The prefabricated UHPC thin-shell tube column structure according to claim 7, characterized in that, The outer ring recessed connecting plate (31), the lower cylinder (32) and the lower inner ring fixing plate (33) are integrally formed. The width of the outer ring recessed connecting plate (31) is the same as the wall thickness of the prefabricated UHPC thin shell column structure. The outer edge of the outer ring recessed connecting plate (31) is provided with an annular groove (311); the outer ring groove (311) is provided with a horizontal connecting bolt hole (312).

9. The prefabricated UHPC thin-shell tube column structure according to claim 8, characterized in that, The fishbone support (4) includes a steel pipe (41) and a circular arc steel bar (42). The circular arc steel bar (42) is fixed at intervals on the steel pipe (41). The lower end of the steel pipe (41) is provided with a thread (43), and the upper end of the steel pipe (41) is provided with a circular arc buckle (44).

10. A method for fabricating a prefabricated UHPC thin-shell tubular column structure, characterized in that, Includes the following steps: S1, prefabricated outer mold, upper cylindrical connecting structure, lower cylindrical connecting structure, the upper cylindrical connecting structure and the lower cylindrical connecting structure are connected by the outer mold; S2, the elastic support structure is tensioned, and then the tensioned elastic support structure is connected to the inner ring fixing plate of the upper cylindrical connection structure and the inner ring fixing plate of the lower cylindrical connection structure through U-shaped buckles, and installed between the upper cylindrical connection structure and the lower cylindrical connection structure. S3, prefabricated fishbone support, is installed inside the elastic support structure after installation. The upper end of the fishbone support is connected to the arc-shaped buckle of the inner ring fixing plate of the upper cylindrical connection structure, and the lower end is connected to the circular bolt hole of the inner ring fixing plate of the lower cylindrical connection structure. It plays a supporting role for the elastic support structure and forms the inner mold structure. S4, on-site installation: Stirrups are installed between the inner and outer molds. UHPC is poured through the pouring port of the upper cylindrical connection structure. After curing, the fishbone support and elastic support structure in the inner mold are removed to form a precast UHPC thin-shell tube column structure with keyways on the inner surface, an upper cylindrical connection structure and a lower cylindrical connection structure.

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