Offshore wind power concrete floating platform mooring node strengthening structure adopting UHPC (Ultra High Performance Concrete) lining and wedge-shaped force transfer block and construction method

Abstract

The invention relates to the technical field of ocean engineering, and discloses an offshore wind power concrete floating platform mooring node strengthening structure adopting a UHPC (Ultra High Performance Concrete) lining and a wedge-shaped force transfer block and a construction method. The structure mainly comprises a concrete outer cylinder wall, a concrete stand column, a UHPC thickening area, a concrete horizontal partition plate, a wedge-shaped force transmission block, an inner cable lug connecting steel plate, a mooring cable lug and a steel anchor bolt. The force flow transmission path of the tension of the mooring cable is obviously optimized through the wedge-shaped force transmission block, and a local strengthening structure is formed in the node core bearing area through the UHPC thickening area. Through the high-strength UHPC thickening area and the wedge-shaped force transmission block, the problem of stress concentration of the concrete outer cylinder wall at the mooring connection position is effectively solved, the mooring connection problem of the concrete floating platform is solved, and the structural performance of the deep and far sea concrete floating platform is improved.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, specifically to a reinforced structure and construction method for mooring nodes of offshore wind power concrete floating platforms using UHPC liners and wedge-shaped force transmission blocks. Background Technology

[0002] As the development of offshore oil and gas and wind energy resources continues to extend into deep waters, the application of floating platforms (such as semi-submersible platforms and SPAR platforms) is becoming increasingly widespread. Traditional deep-sea floating platforms mostly use steel structures, and their mooring systems (including anchor chains, steel cables, etc.) are usually welded to the main structure of the platform using mooring supports (or "anchor lugs") made of cast steel or forged steel. However, steel floating platforms have several inherent drawbacks: First, they are expensive to construct, not only due to the high price of steel itself, but also because of the complexity of their welding and processing techniques, resulting in a high overall cost. Second, they have poor corrosion resistance. The harsh marine environment, especially the deep-sea environment, causes severe corrosion to steel structures, requiring expensive methods such as coatings, sacrificial anodes, and regular inspection and maintenance for protection, resulting in huge life-cycle maintenance costs. To fundamentally reduce construction costs and improve structural durability, concrete floating platforms are considered a highly promising alternative. Concrete materials possess excellent corrosion resistance and fire resistance, demonstrating significant advantages in terms of life-cycle costs. However, reliably connecting the mooring system to the concrete platform body remains a technical challenge that urgently needs to be solved.

[0003] Currently disclosed mooring connection technologies are primarily applicable to steel platforms. For example, Chinese patent document CN112429148A discloses a connection method for welding a steel float to a steel buoy using lugs. Its innovation lies in the connection structure between the mooring chain and the lugs, aiming to improve fatigue performance. However, it does not solve the connection problem between the lugs and the platform body, and its welding prerequisites are not applicable to concrete structures. Chinese patent application CN202211300875.4 relates to a tension leg platform foundation and mooring system, but it is essentially still a traditional steel solution, failing to overcome the aforementioned cost and durability shortcomings of steel structures. The paper "Welding Technology of Mooring Anchor Lugs, Key Components of Deepwater Suction Anchors" focuses on the quality control of the welding process between steel anchor lugs and steel foundations, with its core still being a "steel-to-steel welding" structure.

[0004] Although the industry has begun to explore solutions for concrete floating platforms, such as the "Concrete Floating System" (CN120986610A) proposed by the Huaneng Clean Energy Research Institute, which connects to the mooring chain through an embedded steel barrel, this method significantly increases the thickness of both the steel plate and the concrete. However, optimizing the force transmission path between the concrete body and the mooring components, and effectively coping with the enormous local stress and fatigue loads from the mooring cables, remains a significant challenge.

[0005] Existing mooring connection technologies all rely on welding as a connection method, which requires both connecting materials to be metal. This structure is unsuitable for concrete platforms. Simply embedding steel anchor lugs into concrete can easily cause the concrete to crack and spall under the enormous dynamic mooring loads (especially large local compressive stress and pull-out force), leading to connection failure and seriously threatening platform safety. The stress concentration problem between the flexible mooring cable and the rigid concrete platform is a key bottleneck in achieving a safe and reliable connection. Currently, the industry lacks a dedicated node solution that can overcome this problem through targeted structural design. Summary of the Invention

[0006] To address the challenge of stress concentration at mooring joints in offshore wind power concrete floating platforms, this invention provides a reinforced structure and construction method for mooring joints using a UHPC liner and wedge-shaped force transmission blocks. This structure combines the high strength and toughness of UHPC with the efficient force transmission of the wedge-shaped force transmission blocks, achieving reliable transmission of mooring forces on the concrete floating platform. It also offers advantages such as low cost, high corrosion resistance, and excellent fatigue resistance.

[0007] The technical solution of the present invention is as follows: A reinforced structure for mooring nodes of offshore wind power concrete floating platforms, employing UHPC lining and wedge-shaped force transmission blocks, is characterized by comprising a main concrete structure consisting of a concrete outer cylinder wall, concrete columns, and concrete horizontal partition slabs, as well as a thickened area of ​​ultra-high performance concrete (UHPC), inner steel pads, mooring lugs, steel anchor bolts, and wedge-shaped force transmission blocks connected to the main concrete structure. The UHPC thickened area is cast and formed in the lower part of the inner side of the concrete outer cylinder wall, at the node area where it intersects with the concrete column; The wedge-shaped force transmission block connects the thickened UHPC zone with the horizontal concrete compartment slab. The mooring lug includes a lug connecting steel plate and a mooring lug buckle that are connected as one piece. The mooring lug is fastened to the concrete main structure by an inner steel pad plate located inside the thickened area of ​​UHPC and steel anchor bolts.

[0008] Furthermore, the inner steel pad is pre-embedded inside the thickened area of ​​the UHPC.

[0009] Furthermore, the inclined plane angle of the wedge-shaped force transmission block is 15°-30°.

[0010] Furthermore, the wedge-shaped force transmission block is made of ultra-high performance concrete (UHPC), and steel reinforcement is pre-embedded on its two right-angled sides.

[0011] Furthermore, the steel reinforcement embedded parts of the wedge-shaped force transmission block are respectively embedded in the UHPC thickened area and the concrete horizontal compartment plate, and are cast and connected together with them.

[0012] Furthermore, the contact surfaces between the cable connecting steel plate and the concrete outer cylinder wall, and between the inner steel pad plate and the bolts of the steel anchor bolt, are all rough surfaces, which have serrated, mesh-like patterns or irregular uneven rough surfaces.

[0013] The construction method for the reinforced mooring node structure of the offshore wind power concrete floating platform using UHPC lining and wedge-shaped force transmission blocks is characterized by the following steps: S1: Casting the main concrete structure: High-performance marine concrete is used to cast the concrete outer cylinder wall, concrete columns and concrete horizontal compartment plates. Through holes for anchor bolts to fix mooring lugs and / or reserved installation holes for the steel reinforcement embedded parts for installing wedge force transmission blocks are reserved on the concrete outer cylinder wall and / or concrete columns. Grooves for installing wedge force transmission blocks and reserved installation holes are reserved on the horizontal compartment plates. S2: Installation and formwork of inner steel plate: Position the inner steel plate on the inner side of the outer wall of the poured concrete cylinder above the groove area, and ensure that the anchor bolt holes on the inner steel plate are aligned with the anchor bolt through holes; then set up the thickened area formwork on the inner side of the outer concrete cylinder wall to enclose and form the UHPC thickened area pouring cavity.

[0014] S3: Installation of wedge-shaped force transmission block: Insert the pre-embedded steel bars on the two right-angled sides of the wedge-shaped force transmission block into the reserved installation holes on the inner steel pad, the concrete outer cylinder wall and / or the concrete column and the horizontal compartment plate, respectively. S4: Pouring the UHPC thickened area: Pouring ultra-high performance concrete (UHPC) into the cavity of the UHPC thickened area, vibrating and compacting it, and curing it to form a UHPC thickened area that is bonded to the main structure of the platform and the wedge-shaped force transmission block, and then removing the thickened area formwork. S5: Mooring lug installation: Hoist the mooring lug and lug connecting steel plate into place. First, align the holes on the lug connecting steel plate with the through holes of the anchor bolts, and fasten the mooring lug to the concrete main structure with steel anchor bolts. Apply pre-tightening force to the steel anchor bolts according to the design sequence and torque value to compress all components into a whole.

[0015] Furthermore, in step S4, a layered pouring process is adopted when pouring the UHPC thickened area. First, a 50mm thick bottom layer is poured in the inclined area of ​​the wedge-shaped force transmission block and steel anchor bolt holes are reserved. After compaction, the whole pouring is carried out. After full curing, a high-strength UHPC thickened area is formed.

[0016] Furthermore, in step S5, the preload applied to the steel anchor bolt is such that its effective stress reaches 70% to 85% of its material yield strength; in step S3, the wedge-shaped force transmission block is installed using a total station for precise positioning to ensure that the slope angle error does not exceed ±0.5°.

[0017] Furthermore, in step S2, the positioning of the inner steel pad is achieved by temporarily positioning it using a temporary support frame or by welding it to the reinforcing steel frame.

[0018] This invention employs two main methods. First, it utilizes a thickened UHPC lining area, leveraging the ultra-high strength and excellent toughness of UHPC to form a locally reinforced structure in the core load-bearing area of ​​the node, directly reducing the peak stress. Second, it uses wedge-shaped force transmission blocks, optimizing the force flow transmission path through a special inclined surface design, dispersing the concentrated mooring force gradient to the concrete body, further weakening the stress concentration effect, and ultimately achieving the safe transmission of mooring force.

[0019] This invention, through an innovative combination of a thickened UHPC lining zone and wedge-shaped force transmission blocks, breaks through the limitations of existing steel-to-steel welding methods for enhancing mooring capacity. It effectively solves the stress concentration problem between flexible mooring cables and rigid concrete, avoiding risks such as concrete cracking and connection failure. Simultaneously, the concrete platform offers advantages such as corrosion resistance and low cost, significantly reducing the total life-cycle cost and providing safe and reliable core technology support for deep-sea wind energy development.

[0020] In summary, the beneficial effects of the present invention are as follows: 1. Significantly Optimized Force Transmission: Through the innovative design of the wedge-shaped force transmission block, the mooring force transmission path is optimized to "mooring cable → lugs → cable lug connecting steel plate → anchor bolts → inner steel pad plate → wedge-shaped force transmission block + UHPC thickened area + concrete main structure". The inclined design of the wedge-shaped force transmission block can effectively decompose the horizontal mooring force into pressure and shear force on the concrete main structure, making the force transmission smoother and more reasonable, and significantly reducing the problem of stress concentration.

[0021] 2. Comprehensive Improvement in Structural Performance: The wedge-shaped force transfer block, acting as a force flow conversion device, fully utilizes the high-strength characteristics of UHPC, improving the load-bearing efficiency and fatigue resistance of the joint. Tests show that this design enables the force transmission at the mooring joint to be more clearly defined, from the concrete outer cylinder wall to the wedge-shaped force transfer block and then to the concrete horizontal compartment plate. The tensile force on the concrete outer cylinder wall is effectively transferred to the concrete horizontal compartment plate, forming an effective synergistic force distribution, thus improving the fatigue performance of the joint.

[0022] 3. Significant economic benefits: The main body uses conventional concrete, and key nodes use a small amount of UHPC and wedge-shaped force transmission block structure, which greatly reduces material and manufacturing costs and is significantly more economical than an all-steel structure platform.

[0023] 4. Outstanding durability: The concrete body is corrosion resistant, the internal steel plate is protected, the exposed area of ​​key connectors is small, which significantly reduces the impact of marine environmental corrosion and results in low maintenance costs throughout the entire life cycle.

[0024] 5. Convenient construction quality control: Combining prefabrication and cast-in-place processes, concrete construction and steel structure installation are seamlessly integrated, with clear procedures and convenient quality control, making it suitable for the construction of large floating platform structures. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the overall reinforced structure of the mooring node of the offshore wind power concrete floating platform described in this invention.

[0026] Figure 2 This is a schematic diagram of the transverse cross-sectional structure of the reinforced mooring node of the offshore wind power concrete floating platform described in this invention.

[0027] Figure 3 This is a schematic diagram of the vertical cross-sectional structure of the reinforced mooring node of the offshore wind power concrete floating platform described in this invention.

[0028] Figure 4 This is a schematic diagram showing how mooring lugs are secured to the main concrete structure via inner steel pads and steel anchor bolts.

[0029] Figure 5 The present invention provides a schematic diagram of the construction process of the reinforced structure for the mooring node of the offshore wind power concrete floating platform, wherein (a) is a schematic diagram of the structure after the concrete main body is poured; (b) is a schematic diagram of the structure after the temporary positioning of the inner steel plate and the support of the thickened area template; (c) is a schematic diagram of the installation of the wedge-shaped force transmission block; (d) is a schematic diagram of the pouring process of the UHPC thickened area; (e) is a schematic diagram of the installation process of the mooring lock lugs; and (f) is a schematic diagram of the overall connection structure formed by the components.

[0030] Explanation of the labels in the diagram: 1-Concrete outer cylinder wall, 2-Concrete column, 3-UHPC thickened area, 4-Concrete thickened section formwork, 5-Cable lug connecting steel plate, 6-Inner steel pad plate, 7-Mooring cable lug, 8-Steel anchor bolt, 9-Wedge-shaped force transmission block, 10-Horizontal compartment plate, 11-Anchor bolt through hole, 12-Mooring cable lug buckle, 14-Groove area, 15-Reinforcing bar embedded part, 16-Reserved installation hole. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0032] like Figure 1 , Figure 2As shown, the mooring node reinforcement structure for deep-sea concrete floating platforms of the present invention mainly includes a concrete outer cylinder wall 1, concrete columns 2, a UHPC thickened area 3, an inner steel pad 6, mooring lugs 7, steel anchor bolts 8, wedge-shaped force transmission blocks 9, and a horizontal compartment plate 10. The concrete outer cylinder wall 1, concrete columns 2, and concrete horizontal compartment plate 10 constitute the main concrete structure of the concrete floating platform, and are cast together in a shipyard or dry dock using high-performance marine concrete to form a robust whole. The ultra-high performance concrete (UHPC) thickened area 3, inner steel pad 6, mooring lugs 7, steel anchor bolts 8, and wedge-shaped force transmission blocks 9 are all connected to the main concrete structure. The UHPC thickened area 3 is cast into the lower inner part of the concrete outer cylinder wall 1, at the node area where it intersects with the concrete columns 2. The wedge-shaped force transmission blocks 9 connect the UHPC thickened area 3 and the concrete horizontal compartment plate 10 to optimize the force transmission path. The UHPC thickened zone 3 is made of ultra-high performance concrete (UHPC) material, with a compressive strength of not less than 150 MPa and excellent toughness and durability. The UHPC thickened zone 3 is formed by casting concrete after supporting the thickened section formwork 4 on the inner side of the concrete outer cylinder wall 1. It forms a strong bond with the concrete body and the wedge-shaped force transmission block 9, constituting the core load-bearing area of ​​the node.

[0033] The mooring lug 7 comprises a lug connecting steel plate 5 and a mooring lug buckle 12 connected as one piece. These are prefabricated in the factory using a welding process, ensuring connection strength and quality. The mooring lug 7 is fastened to the concrete main structure by an inner steel pad 6 located inside the UHPC thickened zone 3 and steel anchor bolts 8. By applying pre-tightening force, it is pressed tightly together with the UHPC thickened zone 3, the concrete outer cylinder wall 1, the concrete column 2, and the inner steel pad 6, forming a rigid force-transmitting whole.

[0034] Specifically, the inclined plane of the wedge-shaped force transmission block 9 has an inclination angle of 15°-30° and is made of ultra-high performance concrete (UHPC). Reinforcing steel embedded parts 15 are pre-embedded on its two right-angled sides. The reinforcing steel embedded parts 15 of the wedge-shaped force transmission block 9 are respectively embedded in the UHPC thickened area 3 and the concrete horizontal compartment slab 10, and are cast and connected together with them.

[0035] The inner steel pad 6 is embedded inside the thickened UHPC zone 3. The contact surfaces between the cable connecting steel plate 5 and the concrete outer cylinder wall, and between the inner steel pad 6 and the bolts of the steel anchor bolt 8, are all rough surfaces, which have serrated, mesh-like patterns or irregular uneven textures.

[0036] Multiple high-strength, corrosion-resistant steel anchor bolts 8 pass through pre-aligned anchor bolt holes 11 on the cable connecting steel plate 5, the UHPC thickened zone 3, and the inner steel pad 6, and are subjected to extremely high pre-tightening force using equipment such as hydraulic wrenches. This pre-tightening force causes the cable connecting steel plate 5 and the inner steel pad 6 to tightly "clamp" the UHPC thickened zone 3, and the mooring load is mainly transmitted through the friction between the cable connecting steel plate 5 and the concrete outer cylinder wall 1. The presence of wedge-shaped force transmission blocks 9 further optimizes the force flow transmission path, effectively distributing the mooring force from the concrete outer cylinder wall to the concrete horizontal compartment plate through the wedge-shaped force transmission blocks 9, greatly improving the stress state of the joint.

[0037] The construction process is as follows: Figure 4 As shown, proceed with the following steps: S1: Concrete main structure pouring: High-performance marine concrete is used to pour the concrete outer cylinder wall 1, concrete columns 2, and concrete horizontal compartment slab 10. Through holes 11 for anchor bolts to fix mooring lugs 7 and / or pre-reserved installation holes on the steel reinforcement embedded parts 15 for installing wedge-shaped force transmission blocks 9 are reserved on the concrete outer cylinder wall 1 and / or concrete columns 2. A groove area 14 and pre-reserved installation holes 16 for installing wedge-shaped force transmission blocks 9 are reserved on the horizontal compartment slab 10. Curing is then carried out to the design strength.

[0038] S2: Installation and formwork of inner steel plate: The inner steel pad 6 is temporarily positioned on the inner side of the cast concrete outer cylinder wall 1 above the groove area 14, and the anchor bolt holes on the inner steel pad 6 are aligned with the anchor bolt through holes 11; then the thickened area formwork 4 is set up on the inner side of the concrete outer cylinder wall 1 to enclose and form the UHPC thickened area 3 casting cavity.

[0039] S3: Installation of wedge-shaped force transmission blocks: Insert the pre-embedded steel bars 15 on the two right-angled sides of the wedge-shaped force transmission block 9 into the reserved installation holes on the inner steel pad 6, the concrete outer cylinder wall 1 and / or the concrete column 2 and the horizontal compartment plate 10 respectively; during the installation process, use a total station for precise positioning to ensure that the slope angle error does not exceed ±0.5°.

[0040] S4: Pouring the UHPC thickened area: Pour ultra-high performance concrete (UHPC) into the cavity of the UHPC thickened area 3, vibrate to compact it, and cure it to form a UHPC thickened area 3 that is bonded to the main structure of the platform and the wedge-shaped force transmission block 9. Then remove the thickened area formwork 4. During the pouring process, a layered pouring process is adopted. First, a 50mm thick bottom layer is poured in the inclined area of ​​the wedge-shaped force transmission block 9 and steel anchor bolt 8 holes are reserved. After vibration to compact it, the whole pouring is carried out. After full curing, a high-strength UHPC thickened area 3 is formed.

[0041] S5: Installation of mooring lug 7: Hoist the mooring lug 7 and lug connecting steel plate 5 into place. First, align the holes on the lug connecting steel plate 5 with the anchor bolt through holes 11, and fasten the mooring lug 7 to the concrete main structure using steel anchor bolts 8. Apply pre-tightening force to the steel anchor bolts 8 according to the design sequence and torque value to compress all components into a whole.

[0042] Thus, a durable and economical composite node capable of withstanding enormous mooring forces is completed. Through the optimized design of the wedge-shaped force transmission block 9, this node significantly improves the force transmission path. Force is effectively transferred from the concrete outer cylinder wall to the concrete horizontal compartment plate via the wedge-shaped force transmission block 9, forming a coordinated force-bearing system between the concrete outer cylinder wall, the concrete horizontal compartment plate, and the wedge-shaped force transmission block 9. This provides a reliable mooring connection solution for deep-sea concrete floating platforms.

Claims

1. A reinforced structure for mooring nodes of offshore wind power concrete floating platforms using UHPC lining and wedge-shaped force transmission blocks, characterized in that, It mainly includes a concrete main structure consisting of a concrete outer cylinder wall (1), concrete columns (2), and concrete horizontal compartment slabs (10), as well as a thickened area of ​​ultra-high performance concrete (UHPC) (3), an inner steel pad (6), mooring lugs (7), steel anchor bolts (8), and wedge-shaped force transmission blocks (9) connected to the concrete main structure. The UHPC thickened area (3) is cast into the lower part of the inner side of the concrete outer cylinder wall (1) and the node area where it intersects with the concrete column (2); The wedge-shaped force transmission block (9) connects the UHPC thickened area (3) and the concrete horizontal compartment plate (10); The mooring lug (7) includes a lug connecting steel plate (5) and a mooring lug buckle (12) connected as one piece. The mooring lug (7) is fastened to the concrete main structure by an inner steel pad (6) located inside the thickened area (3) of UHPC and a steel anchor bolt (8).

2. The mooring node reinforcement structure according to claim 1, characterized in that, The inner steel pad (6) is embedded inside the thickened area (3) of the UHPC.

3. The mooring node reinforcement structure according to claim 1, characterized in that, The inclined plane angle of the wedge-shaped force transmission block (9) is 15°-30°.

4. The mooring node reinforcement structure according to claim 1, characterized in that, The wedge-shaped force transmission block (9) is made of ultra-high performance concrete material UHPC, and steel reinforcement embedded parts (15) are pre-embedded on its two right-angled sides.

5. The mooring node reinforcement structure according to claim 4, characterized in that, The steel reinforcement embedded parts (15) of the wedge-shaped force transmission block (9) are respectively embedded in the UHPC thickened area (3) and the concrete horizontal compartment plate (10), and are cast together with them.

6. The mooring node reinforcement structure according to claim 1, characterized in that, The contact surfaces between the cable connecting steel plate (5) and the concrete outer cylinder wall, and between the inner steel pad plate (6) and the steel anchor bolt (8), are all rough surfaces, which have serrated, mesh-like patterns or irregular uneven rough surfaces.

7. The construction method of the mooring node reinforcement structure according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Casting the main concrete structure: High-performance marine concrete is used to cast the concrete outer cylinder wall (1), concrete columns (2) and concrete horizontal compartment plate (10). Anchor bolt through holes (11) for fixing mooring lugs (7) and / or reserved installation holes on the steel reinforcement embedded parts (15) for installing wedge force transmission blocks (9) are reserved on the concrete outer cylinder wall (1) and / or concrete columns (2). A groove area (14) for installing wedge force transmission blocks (9) and reserved installation holes are reserved on the horizontal compartment plate (10). S2: Installation and formwork of inner steel plate: Position the inner steel plate (6) on the inner side of the cast concrete outer cylinder wall (1) above the groove area (14), and ensure that the anchor bolt hole on the inner steel plate (6) is aligned with the anchor bolt through hole (11); then support the thickened area formwork (4) on the inner side of the concrete outer cylinder wall (1) to enclose and form the UHPC thickened area (3) casting cavity. S3: Installation of wedge-shaped force transmission block: Insert the pre-embedded steel reinforcement parts (15) on the two right-angled sides of the wedge-shaped force transmission block (9) into the reserved installation holes on the inner steel pad (6), the concrete outer cylinder wall (1) and / or the concrete column (2) and the horizontal compartment plate (10), respectively. S4: Pouring UHPC thickened area: Pouring ultra-high performance concrete (UHPC) into the cavity of the UHPC thickened area (3), vibrating and compacting it and curing it to form a UHPC thickened area (3) that is bonded to the main structure of the platform and the wedge-shaped force transmission block (9), and removing the thickened area template (4). S5: Installation of mooring lugs (7): Hoist the mooring lugs (7) and lug connecting steel plates (5) into place. First, align the holes on the lug connecting steel plates (5) with the anchor bolt through holes (11), and fasten the mooring lugs (7) to the concrete main structure using steel anchor bolts (8). Apply pre-tightening force to the steel anchor bolts (8) according to the design sequence and torque value to compress all components into a whole.

8. The construction method according to claim 7, characterized in that, In step S4, when pouring the UHPC thickened area (3), a layered pouring process is adopted. First, a 50mm thick bottom layer is poured in the inclined area of ​​the wedge-shaped force transmission block (9) and a steel anchor bolt (8) hole is reserved. After compaction, the whole pouring is carried out. After full curing, a high-strength UHPC thickened area (3) is formed.

9. The construction method according to claim 7 or 8, characterized in that, In step S5, the preload applied to the steel anchor bolt (8) causes its effective stress to reach 70% to 85% of its material yield strength; in step S3, the wedge-shaped force transmission block (9) is installed using a total station for precise positioning to ensure that the slope angle error does not exceed ±0.5°.

10. The construction method according to claim 7, characterized in that, In step S2, the inner steel pad (6) is positioned temporarily by means of a temporary support frame or by welding it to the steel reinforcement frame.

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