CN-121976561-A - Offshore platform ultra-high performance concrete suction pile foundation structure

Abstract

The invention discloses an offshore platform ultra-high performance concrete suction pile foundation structure, which belongs to the technical field of ocean engineering and comprises a pile foundation main body, wherein the pile foundation main body is formed by casting ultra-high performance concrete, a central interlayer is arranged in the side wall of the pile foundation main body, and a plurality of holes which are arranged in an array are formed in the circumferential direction of the central interlayer. The invention fully utilizes the ultrahigh strength, high toughness and excellent durability of the ultrahigh-performance concrete material, fundamentally solves the problems of easy corrosion and frequent maintenance of the traditional steel pile, and on the other hand, optimizes the material distribution through hole design, and remarkably lightens the self weight of the structure while ensuring the ultrahigh pressure resistance and the bending resistance of the pile foundation. The design realizes the cooperative lifting of high strength, high durability and light weight, has more complete structure and more reasonable stress, greatly reduces the transportation, installation and full life cycle maintenance costs, and provides a more efficient and reliable foundation support for the ocean platform.

Inventors

• ZHANG XU
• ZHU HAOMING
• XU LIANGBIN
• LIU KECHENG

Assignees

• 中山大学
• 南方海洋科学与工程广东省实验室(珠海)

Dates

Publication Date

20260505

Application Date

20260203

Claims (8)

1. 1. The offshore platform ultra-high performance concrete suction pile foundation structure is characterized by comprising a pile foundation main body, wherein the pile foundation main body is formed by casting ultra-high performance concrete, a central interlayer (12) is arranged in the side wall of the pile foundation main body, and a plurality of holes (4) which are distributed in an array are formed in the circumferential direction on the central interlayer (12).
2. 2. The ultra-high performance concrete suction pile foundation structure of the offshore platform according to claim 1, wherein the geometric shape, the size and the distribution density of the holes (4) are determined by topological optimization and parameterization analysis through a finite element method, the overall compressive strength of the pile body is taken as a constraint condition, the self weight of the structure is taken as an optimization target, and the optimal geometric parameter range is obtained through multi-task iterative computation.
3. 3. The offshore platform ultra-high performance concrete suction pile foundation structure according to claim 2, wherein the holes (4) are regular hexagons arranged in a honeycomb array on the central interlayer (12).
4. 4. The ultra-high performance concrete suction pile foundation structure of claim 1, wherein the pile foundation body is a hollow cylinder, and comprises an inner wall surface (11) and an outer wall surface (13), and the central interlayer (12) is arranged between the inner wall surface (11) and the outer wall surface (13) and connects the inner wall surface (11) and the outer wall surface (13).
5. 5. The ultra-high performance concrete suction pile foundation structure of offshore platform according to claim 4, wherein said inner wall surface (11), said outer wall surface (13) and said central sandwich layer (12) are integrally formed.
6. 6. The offshore platform ultra-high performance concrete suction pile foundation structure according to claim 1, further comprising a top cover (5), wherein the top cover (5) is arranged at the top of the pile foundation body, a water pumping port (6) is integrated on the top cover (5), and the water pumping port (6) penetrates through the top cover (5).
7. 7. The offshore platform ultra-high performance concrete suction pile foundation structure according to claim 6, wherein the pile foundation body upper portion is provided with reinforcing ribs (7).
8. 8. The ultra-high performance concrete suction pile foundation structure of the offshore platform according to claim 7, wherein the reinforcing ribs (7) are uniformly distributed along the circumference of the upper part of the pile foundation body and are fixedly connected with the pile foundation body and the top cover (5).

Description

Offshore platform ultra-high performance concrete suction pile foundation structure Technical Field The invention belongs to the technical field of ocean engineering, and particularly relates to an offshore platform ultra-high-performance concrete suction pile foundation structure. Background The ocean platform is used as a core infrastructure of ocean engineering such as ocean oil gas development, offshore wind power and the like, and the safety, durability and economy of the foundation structure directly determine the feasibility and full life cycle operation benefit of the engineering. In various ocean platform foundation types, the suction pile foundation has become one of main stream choices of shallow sea to middle and deep sea area platform foundations by virtue of the remarkable advantages of convenience in installation, high bearing capacity, small disturbance to a seabed soil layer and the like, and is widely applied to engineering scenes such as ocean oil gas exploitation platforms, offshore wind farms and the like. However, the conventional steel suction piles which are widely used currently still face a plurality of technical limitations which are difficult to overcome in practical application. On the one hand, the marine environment has the characteristics of high salinity, high humidity and strong corrosiveness, and steel is extremely easy to generate electrochemical corrosion in such severe environments for a long time, so that the pile body wall thickness is reduced, the mechanical property is degraded, and the structural safety of a platform foundation is seriously threatened. In order to delay the corrosion process, the steel suction pile needs to be subjected to corrosion prevention maintenance at regular intervals, and measures such as coating corrosion prevention coating, cathodic protection and the like are taken, so that the operation difficulty is high, the operation cost is high, the normal operation of the ocean platform can be influenced, and the total life cycle cost of engineering is obviously increased. On the other hand, the steel material has high self density, so that the traditional steel suction pile has high self weight, not only the energy consumption and the cost in the transportation process are increased, but also the hoisting capacity and the bearing capacity of the installation ship are required to be higher, and particularly in a deep sea area, the difficulty and the risk of transportation and installation are further amplified by complex marine weather and sea conditions. In order to solve the corrosion problem of the traditional steel suction pile, the industry begins to explore to replace steel with a novel high-performance material, wherein ultra-high-performance concrete (UHPC) has the advantages of ultra-high compressive strength, high toughness, excellent chloride ion permeation resistance and excellent durability, and becomes a substitute material with great potential. The ultra-high performance concrete material can theoretically realize long-term maintenance-free performance by optimizing aggregate grading, doping steel fibers and active mineral admixture and removing corrosion hidden danger from the material layer surface, and the mechanical property of the ultra-high performance concrete material can completely meet the bearing requirement of ocean platform foundation. However, it should be pointed out that if the ultra-high performance concrete material is simply applied to the suction pile structure, and the design form of solid or uniform thickness section is adopted, although the corrosion problem can be solved, a new technical contradiction is caused that the ultra-high performance concrete pile with solid or uniform thickness section needs a large amount of materials to ensure the structural strength, so that the pile body weight is increased, the material cost is high, the economic benefit of light weight is difficult to realize, and even the defects of heavy weight and high transportation and installation difficulty of the traditional steel suction pile can be reappeared, and the performance advantage of the ultra-high performance concrete material can not be fully exerted. Therefore, an innovative suction pile foundation structure with the characteristics of ultrahigh strength, excellent durability and light weight is urgently needed in the industry to overcome the inherent defects of the prior art, meet the urgent requirements of a modern ocean platform on high performance, long service life, low maintenance and economy of a foundation structure, and promote the upgrading and development of ocean engineering foundation technology. Therefore, an offshore platform ultra-high performance concrete suction pile foundation structure is provided. Disclosure of Invention In order to solve the technical problems, the invention provides an offshore platform ultra-high performance concrete suction pile foundation structure. The invention provides an off