Foundation bed structure of ultra-large offshore concrete gravity platform
By using a foundation structure of geotextile concrete and cast-in-place underwater concrete, the problem of unfavorable stress distribution when installing ultra-large offshore concrete gravity platforms on uneven ground was solved, thereby improving stability and ease of construction, while reducing project costs and environmental impact.
Patent Information
- Application Number
- CN202423098580.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-13
AI Technical Summary
When ultra-large offshore concrete gravity platforms are installed on uneven ground, the platform base plate is not subjected to stress, the amount of riprap foundation is large and the construction is difficult, which affects the project cost.
The foundation bed structure adopts a combination of geotextile concrete and cast-in-place underwater concrete, including a central geotextile concrete group, a head geotextile concrete group, and an outer ring geotextile concrete group. Combined with cast-in-place underwater concrete, it forms an isosceles triangular layout, which reduces the impact on the foundation and adapts to the foundation and platform structure.
It reduces the demand for stone, lowers project costs, simplifies construction, ensures platform stability and ease of construction, and reduces environmental impact.
Smart Images
Figure CN223548603U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a foundation structure for an ultra-large offshore concrete gravity platform. Background Technology
[0002] With increasing environmental awareness, the demand for clean energy is growing rapidly, driving the development of more offshore green energy stations, such as offshore LNG receiving terminals and offshore green hydrogen production and storage stations. Offshore green energy stations come in two structural types: floating and fixed. Fixed stations are mostly gravity-type structures, prefabricated in onshore prefabrication yards and then floated to the project location, where they are installed using ballast. Gravity platform structures are large enough to guarantee the required production capacity, and ultra-large gravity platforms place higher demands on the substrate.
[0003] Concrete gravity platforms rely on their own weight and the weight of the fill material to withstand external loads, ensuring the stability of the structure. A foundation bed prevents the concrete gravity platform from resting on uneven ground, while simultaneously increasing the bearing area of the foundation, reducing the load stress on the foundation surface, and minimizing foundation settlement. Generally, a riprap foundation bed is used (see...). Figure 1 However, the ground area of the super-large concrete gravity platform is large and the foundation stress is high. On the one hand, the amount of riprap used is large, which requires quarrying and affects the project cost. On the other hand, the leveling of the riprap foundation is difficult. Utility Model Content
[0004] The purpose of this utility model is to overcome the defects of the prior art and provide a foundation bed structure for an ultra-large offshore concrete gravity platform. It can avoid the adverse effects of uneven local foundation on the platform bottom plate, ensure the stability of the platform, reduce the project cost, and facilitate construction.
[0005] The purpose of this utility model is achieved as follows: a foundation structure for an ultra-large concrete gravity platform, comprising formwork concrete and cast-in-place underwater concrete; wherein,
[0006] The geotextile concrete is laid between the top surface of the leveled foundation and the bottom surface of the platform and includes bottom geotextile concrete and outer ring geotextile concrete.
[0007] The bottom geotextile concrete includes a middle geotextile concrete group and two head geotextile concrete groups; the middle geotextile concrete group is laid in the middle of one long side of the platform; the two head geotextile concrete groups are laid one-to-one at the two ends of the other long side of the platform; the center of the laying range of the middle geotextile concrete group and the center of the laying range of the two head geotextile concrete groups form an isosceles triangle.
[0008] The outer ring of the formwork concrete includes a lower outer ring of formwork concrete and an upper outer ring of formwork concrete; the lower outer ring of formwork concrete is laid around the platform and spaced a certain distance from the outer sides of the platform; the upper outer ring of formwork concrete is laid on the top surface of the lower outer ring of formwork concrete and fits against the platform.
[0009] The cast-in-place underwater concrete is poured between the top surface of the foundation and the bottom surface of the platform, as well as between the outer sides of the platform and the inner sides of the lower outer ring of the formwork concrete.
[0010] In the aforementioned foundation structure of the ultra-large concrete gravity platform, the length of the laying range of the middle formwork concrete group is greater than the length of the laying range of the head formwork concrete group; the width of the laying range of the middle formwork concrete group is the same as the width of the laying range of the head formwork concrete group.
[0011] The foundation structure of the aforementioned ultra-large offshore concrete gravity platform, wherein the central geotextile concrete group and the head geotextile concrete group are both composed of multiple spaced geotextile concrete blocks.
[0012] In the aforementioned foundation structure of the ultra-large offshore concrete gravity platform, the width and height of the lower outer ring of the formwork concrete are identical to the width and height of the upper outer ring of the formwork concrete.
[0013] The foundation structure of this utility model for an ultra-large offshore concrete gravity platform has the following characteristics:
[0014] 1) By using a central geotextile concrete assembly and two head geotextile concrete assemblies during the sinking and installation of the platform, a channel is provided for the water at the bottom of the platform, reducing the impact of the water on the soil at the bottom of the platform; at the same time, it can avoid the adverse effects of uneven local foundation on the stress of the platform bottom plate.
[0015] 2) Replace riprap with cast-in-place underwater concrete, as cast-in-place underwater concrete has good adaptability to foundation and platform structures.
[0016] 3) In areas where stone is scarce, the demand for stone can be reduced, which is conducive to the construction of ultra-large gravity platform projects. Other gravity structures can also be used when stone is scarce.
[0017] 4) Reduce the environmental impact of quarrying. Attached Figure Description
[0018] Figure 1 This is an elevation view of the foundation structure of an ultra-large offshore concrete gravity platform based on existing technology.
[0019] Figure 2 This is a plan view of the foundation structure of the ultra-large offshore concrete gravity platform of this utility model;
[0020] Figure 3 yes Figure 2 AA direction view;
[0021] Figure 4 This is a plan view of the foundation bed structure of this utility model during construction;
[0022] Figure 5 This is another plan view of the foundation bed structure of this utility model during construction. Detailed Implementation
[0023] The present invention will be further described below with reference to the accompanying drawings.
[0024] Please see Figure 2 and Figure 3 The foundation structure of the ultra-large offshore concrete gravity platform of this utility model includes formwork concrete and cast-in-place underwater concrete.
[0025] The formwork concrete is laid between the top surface of the leveled foundation and the bottom surface of platform 10, and includes the bottom formwork concrete and the outer ring formwork concrete; wherein,
[0026] The bottom formwork concrete includes a central formwork concrete group 11 and two head formwork concrete groups 12. The central formwork concrete group 11 is laid in the middle of one long side of the platform 10. The two head formwork concrete groups 12 are laid one-to-one at the two ends of the other long side of the platform 10. The length of the laying range of the central formwork concrete group 11 is greater than the length of the laying range of the head formwork concrete group 12. The width of the laying range of the central formwork concrete group 11 is the same as the width of the laying range of the head formwork concrete group 12. Both the central formwork concrete group 11 and the head formwork concrete group 12 are composed of multiple spaced-apart formwork concrete groups. The line connecting the center of the laying range of the central formwork concrete group 11 and the center of the laying range of the two head formwork concrete groups 12 forms an isosceles triangle.
[0027] The outer ring formwork concrete includes a lower outer ring formwork concrete 21 and an upper outer ring formwork concrete 22; wherein,
[0028] The lower outer ring of formwork concrete 21 is laid around the perimeter of the platform 10 and spaced a certain distance from the outer perimeter of the platform 10; the upper outer ring of formwork concrete 22 is laid on top of the lower outer ring of formwork concrete 21 and fits against the outer perimeter of the platform 10; the width and height of the lower outer ring of formwork concrete 21 are the same as those of the upper outer ring of formwork concrete 22.
[0029] The cast-in-place underwater concrete 3 is poured between the top surface of the foundation and the bottom surface of the platform 10, and between the outer sides of the platform 10 and the inner sides of the lower outer ring formwork concrete 21.
[0030] If the ultra-large offshore gravity platform is 300m long, 150m wide, and 30m high; the central geotextile concrete group 11 consists of 10 geotextile concrete strips, each 40m long, 4.5m wide, and 0.1m high, laid at 3.5m intervals, with a total length of 76.5m and a width of 40m; each head geotextile concrete group 12 consists of 5 geotextile concrete strips, each 40m long, 4.5m wide, and 0.1m high, laid at 3.5m intervals, with a total length of 36.5m and a width of 40m. The lower outer ring geotextile concrete group 21 is 4.5m wide and 0.2m high. The distance between the lower outer ring geotextile concrete group 21 and the perimeter of the platform is 0.1m.
[0031] The foundation structure of this utility model for an ultra-large offshore concrete gravity platform is constructed according to the following steps:
[0032] Step 1: Level the ground at the platform installation location;
[0033] Step 2: Lay the central formwork concrete group 11 and two head formwork concrete groups 12 on the top surface of the leveled foundation; alternatively, the central formwork concrete group 11 and two head formwork concrete groups 12 can be prefabricated as a whole with the bottom plate of the platform 10 during the prefabrication of the platform.
[0034] Step 3: Place platform 10 on the laid central formwork concrete group 11 and the two head formwork concrete groups 12 (see...) Figure 4 );
[0035] Step 4: Lay the lower outer ring of formwork concrete 21 around the perimeter of platform 10; the lower outer ring of formwork concrete 21 is slightly higher than the bottom formwork concrete of the platform, and a certain gap is left between the lower outer ring of formwork concrete 21 and the outer perimeter of platform 10 (see...). Figure 5 );
[0036] Step 5: Cast underwater concrete 3 below the platform. The pouring sequence is as follows: pour from the middle to the side along the short side of the platform 10; pour from the middle and both ends along the long side of the platform 10 simultaneously into the interior; stop pouring when the underwater concrete between the lower outer ring formwork concrete 21 and the platform 10 is overflowing.
[0037] Step 6: Lay the upper outer ring of formwork concrete 22 around the perimeter of platform 10 and connect the upper outer ring of formwork concrete 22 with the anti-erosion facilities around platform 10.
[0038] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.
Claims
1. A foundation structure for an ultra-large concrete gravity platform, comprising formwork concrete and cast-in-place underwater concrete; characterized in that, The geotextile concrete is laid between the top surface of the leveled foundation and the bottom surface of the platform and includes bottom geotextile concrete and outer ring geotextile concrete. The bottom geotextile concrete includes a middle geotextile concrete group and two head geotextile concrete groups; the middle geotextile concrete group is laid in the middle of one long side of the platform; the two head geotextile concrete groups are laid one-to-one at the two ends of the other long side of the platform; the center of the laying range of the middle geotextile concrete group and the center of the laying range of the two head geotextile concrete groups form an isosceles triangle. The outer ring of the formwork concrete includes a lower outer ring of formwork concrete and an upper outer ring of formwork concrete; the lower outer ring of formwork concrete is laid around the platform and spaced a certain distance from the outer sides of the platform; the upper outer ring of formwork concrete is laid on the top surface of the lower outer ring of formwork concrete and fits against the platform. The cast-in-place underwater concrete is poured between the top surface of the foundation and the bottom surface of the platform, as well as between the outer sides of the platform and the inner sides of the lower outer ring of the formwork concrete.
2. The foundation structure of the ultra-large concrete gravity platform according to claim 1, characterized in that, The length of the laying range of the middle geotextile bag concrete group is greater than the length of the laying range of the head geotextile bag concrete group; the width of the laying range of the middle geotextile bag concrete group is the same as the width of the laying range of the head geotextile bag concrete group.
3. The foundation structure of the ultra-large offshore concrete gravity platform according to claim 1 or 2, characterized in that, Both the middle and head geotextile concrete groups are composed of multiple spaced geotextile concrete blocks.
4. The foundation structure of the ultra-large offshore concrete gravity platform according to claim 1, characterized in that, The width and height of the lower outer ring of the formwork concrete are the same as those of the upper outer ring of the formwork concrete.