CN108677990B - Assembled ocean suction type caisson foundation structure and construction method thereof - Google Patents
Assembled ocean suction type caisson foundation structure and construction method thereof Download PDFInfo
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- CN108677990B CN108677990B CN201810835181.8A CN201810835181A CN108677990B CN 108677990 B CN108677990 B CN 108677990B CN 201810835181 A CN201810835181 A CN 201810835181A CN 108677990 B CN108677990 B CN 108677990B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/18—Foundations formed by making use of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/02—Caissons able to be floated on water and to be lowered into water in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
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Abstract
The invention discloses an assembled ocean suction type caisson foundation structure and a construction method thereof, wherein the foundation structure comprises a plurality of cylindrical structures with two open ends; the top of each cylindrical structure is provided with an inward concave mounting groove which is used for being matched with the round steel plate; the cylindrical structures are spliced together up and down, and the top of the cylindrical structure positioned at the topmost layer is matched with a round steel plate. The foundation structure of the multi-section small caisson is formed by connecting a round steel plate with a multi-section barrel structure, and is installed by sinking section by section under the action of internal and external pressure difference. The method can effectively reduce the problems of uneven settlement of the drum structure and air in the drum body caused by uneven stratum, and the like, permanently improve the foundation stability of the caisson structure, and effectively reduce the unstable deformation of the caisson structure in weak stratum; in addition, the length of the original caisson structure is reduced, so that the caisson has certain flexibility, can effectively adapt to bad geological conditions such as weak seabed and the like, and has adjustability.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a novel ocean suction type caisson foundation structure which is formed by constructing an ocean exploitation platform in an ocean soft clay or sandy stratum.
Background
The suction type caisson foundation structure is a large-diameter steel drum structure with an open bottom end and a closed upper end, has the advantages of low cost, reusability and the like, and is increasingly applied to deep water ocean platform engineering. However, due to the huge volume of the foundation structure of the ocean suction caisson, the transportation and the installation are relatively complex; meanwhile, in the field installation process of the large-volume suction type caisson foundation structure, the large-volume caisson foundation structure is sunk into the seabed under the action of internal and external pressure differences, and air exists in the large-volume caisson foundation structure due to the fact that soft clay or sand in the seabed stratum is uneven, and the fact that the caisson structure is sunk into the seabed cannot be met, so that unstable potential safety hazards exist in the suction type caisson foundation structure, the upper ocean exploitation platform is extremely prone to overturning deformation, and accordingly life safety of constructors is endangered, and production equipment is damaged. Meanwhile, a large amount of manpower, equipment and financial resources are required to be input in the construction process of the large-volume suction type caisson foundation structure, and meanwhile, the construction risk is increased. With the continuous development of China ocean resources to deep sea, the traditional ocean suction type caisson foundation structure cannot ensure the rapid and efficient development requirement of the ocean resources, and the development and the application of the suction type caisson foundation structure are restricted. Therefore, the assembled structure concept and the ocean suction type caisson foundation structure form a novel suction type caisson foundation structure, and the assembled ocean suction type caisson foundation structure is provided by referring to the construction method of the assembled structure so as to meet the construction and stability of the underwater structure in the ocean area.
Disclosure of Invention
The invention aims to solve the problems, and provides an assembled ocean suction type caisson foundation structure and a construction method thereof, wherein the structure can effectively improve the installation speed and the application range of the suction type caisson foundation structure, reduce the destabilization damage of the suction type caisson foundation structure, permanently improve the self-stability performance of the suction type caisson foundation structure and ensure the personnel safety and equipment operation during the construction and operation of an upper ocean exploitation platform.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an assembled ocean suction type caisson foundation structure comprises a plurality of cylindrical structures with two open ends; the top of each cylindrical structure is provided with an inward concave mounting groove which is used for being matched with the round steel plate; the cylindrical structures are spliced together up and down, and the top of the cylindrical structure positioned at the topmost layer is matched with a round steel plate.
Furthermore, the thickness of the bottom of the side wall of the cylindrical structure at the bottommost layer is gradually reduced from inside to outside, so that a sharp bottom is formed, and the plugging is convenient.
Further, the bottoms of the other cylindrical structures except the bottommost cylindrical structure are provided with protrusions matched with the top mounting grooves of the lower cylindrical structure.
Further, the diameter of the cylindrical structure is 10m, the height is 3m, and the thickness is 0.2m.
Further, the diameter of the round steel plate is slightly smaller than that of the cylinder.
The specific installation method is as follows:
firstly, rotationally fixing a round steel plate on the top of a drum through a first section of drum top sliding wire to form a caisson foundation structure, namely a first section of caisson foundation structure;
secondly, a pressure difference is applied to the inside and the outside of the barrel body, and a first caisson structure is installed;
then, after the first section of caisson foundation structure is installed, separating the round steel plate from the first section of drum structure; and connecting the round steel plate with a second section of round barrel structure to form a second section of caisson foundation structure, sinking and installing the second section of caisson foundation structure in place in the same way, and installing other sections of caisson foundation structures in a similar way until the design requirement is met.
The working principle of the invention is as follows:
the foundation structure of the multi-section small caisson is formed by connecting a round steel plate with a multi-section barrel structure, and is installed by sinking section by section under the action of internal and external pressure difference. The method can effectively reduce the problems of uneven settlement of the drum structure and air in the drum body caused by uneven stratum, and the like, permanently improve the foundation stability of the caisson structure, and effectively reduce the unstable deformation of the caisson structure in weak stratum; in addition, the structural length of the original caisson structure is reduced, so that the caisson has certain flexibility, can effectively adapt to bad geological conditions such as weak seabed and the like, and has adjustability.
The beneficial effects of the invention are as follows:
1. the foundation structure of the multi-section small caisson is formed by connecting a round steel plate with a multi-section barrel structure, and is installed by sinking section by section under the action of internal and external pressure difference. The method can effectively reduce the problems of uneven settlement of the drum structure and air in the drum body caused by uneven stratum, and the like, permanently improve the foundation stability of the caisson structure, and effectively reduce the unstable deformation of the caisson structure in weak stratum; in addition, the original caisson structure length is reduced (here, the single-section caisson structure length is reduced relative to the original integral structure length in the transportation process), so that the caisson has certain flexibility, can effectively adapt to bad geological conditions such as weak seabed and the like, and has adjustability.
2. Caisson foundation structure stability aspect: the application range of the foundation structure of the caisson can be effectively improved, the unstable damage of the foundation of the caisson structure is reduced, the self-stability performance of the foundation structure is permanently improved, and the personnel safety and equipment operation during the construction and operation of the caisson structure are ensured.
3. Adaptability to severe geological conditions: the defects of overlong foundation structure, poor flexibility deformation adaptability and the like of the original caisson are overcome, so that the caisson has certain flexibility, can effectively adapt to bad geological conditions such as weak seabed and the like, and has adjustability.
4. The construction aspect is as follows: the suction type caisson foundation is used as a deep foundation structure of the offshore oil exploitation platform, and the construction process is mature, convenient and quick.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
Fig. 1 and 2 are schematic views of circular steel plates in an assembled ocean suction caisson foundation structure.
Figure 3 is a longitudinal cross-sectional view of a first section of drum structure in an assembled marine suction caisson foundation structure.
FIG. 4 is a longitudinal cross-sectional view of other pitch drum structures in the assembled ocean suction caisson foundation structure.
FIG. 5 is a schematic illustration of the assembled marine suction caisson foundation structure.
Wherein, the unit: m; 1. a circular steel plate; 2. a first barrel structure; 3. drum structures of other sections.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "upper", "lower", "left" and "right" in the present invention, if they mean only that the directions are consistent with the upper, lower, left, and right directions of the drawings per se, and do not limit the structure, only for convenience of description and simplification of the description, but do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As described in the background, the marine suction caisson foundation structure is bulky and relatively complex to transport and install; meanwhile, in the field installation process of the large-volume suction type caisson foundation structure, the large-volume caisson foundation structure is sunk into the seabed under the action of internal and external pressure differences, and air exists in the large-volume caisson foundation structure due to the fact that soft clay or sand in the seabed stratum is uneven, and the fact that the caisson structure is sunk into the seabed cannot be met, so that unstable potential safety hazards exist in the suction type caisson foundation structure, the upper ocean exploitation platform is extremely prone to overturning deformation, and accordingly life safety of constructors is endangered, and production equipment is damaged. Meanwhile, a large amount of manpower, equipment and financial resources are required to be input in the construction process of the large-volume suction type caisson foundation structure, and meanwhile, the construction risk is increased. With the continuous development of China ocean resources to deep sea, the traditional ocean suction type caisson foundation structure cannot ensure the rapid and efficient development requirement of the ocean resources, and the development and the application of the suction type caisson foundation structure are restricted. Therefore, the assembled structure concept and the ocean suction type caisson foundation structure form a novel suction type caisson foundation structure, and the assembled ocean suction type caisson foundation structure is provided by referring to the construction method of the assembled structure so as to meet the construction and stability of the underwater structure in the ocean area.
In an exemplary embodiment of the present application, as shown in fig. 1: the round steel plate has a size of 9.9m diameter and 0.2m height.
As shown in fig. 2, the drum of the first section of the assembled ocean suction caisson foundation structure has a size of 10m diameter, 3m height and 0.2m thickness; the thickness of the bottom of the side wall is gradually reduced from inside to outside to form a sharp bottom, so that the bottom is convenient to insert into a submerged seabed; the top of the steel plate is provided with an inward concave mounting groove which is used for being matched with the round steel plate.
As shown in fig. 3, the size of the drum of the other section of the assembled ocean suction caisson foundation structure is 10m in diameter, 3m in height and 0.2m in thickness; the bottom is provided with a bulge matched with the mounting groove at the top of the lower cylindrical structure; the top of the steel plate is provided with an inward concave mounting groove which is used for being matched with the round steel plate.
As shown in fig. 4, each section of the drum structure is connected with a circular steel plate in sequence, the drum structure is sunk into the seabed by utilizing the internal and external pressure difference, the circular steel plate is lifted, the next section of the drum structure is installed, and the sunk multi-section drum structure is assembled into a complete suction type caisson foundation structure.
Specifically, the construction method of the assembled ocean suction type caisson foundation structure comprises the following steps:
(1) Manufacturing of round steel plate and round barrel structure
A plurality of barrel structures with the diameter of 10m, the height of 3m and the thickness of 0.2m; round steel plates with the diameter of 9.9m and the height of 0.2m can be prefabricated in a prefabrication factory.
(2) First section barrel structure installation
The first section of the barrel structure is connected with the round steel plate, and the barrel structure is submerged into the seabed by utilizing the pressure difference between the inside and the outside, so that the round steel plate is lifted.
(3) Second pitch barrel structure installation
The second section of the barrel structure is connected with the top of the first section of the barrel structure, the second section of the barrel structure is connected with the round steel plate, and the barrel structure is submerged into the seabed by utilizing the internal and external pressure difference to lift the round steel plate. The installation method of the other sections of the barrel structure is the same. Thereby combining and assembling to form a complete suction type caisson foundation structure.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (5)
1. A construction method of an assembled ocean suction type caisson foundation structure is characterized in that,
the assembled ocean suction type caisson foundation structure comprises a plurality of cylindrical structures with two open ends; the top of each cylindrical structure is provided with an inward concave mounting groove which is used for being matched with the round steel plate; a plurality of cylindrical structures are spliced together up and down, and a round steel plate is matched with the top of the cylindrical structure at the topmost layer;
the construction method comprises the following steps:
firstly, rotationally fixing a round steel plate on the top of a drum through a first section of drum top sliding wire to form a caisson foundation structure, namely a first section of caisson foundation structure;
secondly, a pressure difference is applied to the inside and the outside of the barrel body, and a first caisson structure is installed;
then, after the first section of caisson foundation structure is installed, separating the round steel plate from the first section of drum structure; and connecting the round steel plate with a second section of round barrel structure to form a second section of caisson foundation structure, sinking and installing the second section of caisson foundation structure in place in the same way, and installing other sections of caisson foundation structures in a similar way until the design requirement is met.
2. The method of constructing an assembled ocean suction caisson foundation structure according to claim 1, wherein the thickness of the bottom of the side wall of the cylindrical structure at the bottommost layer is gradually reduced from inside to outside to form a sharp bottom, which is convenient for plugging.
3. A method of constructing a fabricated ocean suction caisson foundation structure as claimed in claim 1, wherein the bottom of the other cylindrical structure is provided with protrusions which mate with the top mounting slots of the underlying cylindrical structure, in addition to the bottommost cylindrical structure.
4. A method of constructing a fabricated ocean suction caisson foundation structure as claimed in claim 1, wherein the cylindrical structure has a diameter of 10m, a height of 3m and a thickness of 0.2m.
5. A method of constructing a fabricated ocean suction caisson foundation structure as claimed in claim 1, wherein the diameter of the circular steel plate is slightly smaller than the diameter of the cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810835181.8A CN108677990B (en) | 2018-07-26 | 2018-07-26 | Assembled ocean suction type caisson foundation structure and construction method thereof |
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| CN201810835181.8A CN108677990B (en) | 2018-07-26 | 2018-07-26 | Assembled ocean suction type caisson foundation structure and construction method thereof |
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| CN108677990A CN108677990A (en) | 2018-10-19 |
| CN108677990B true CN108677990B (en) | 2023-06-02 |
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| CN110080269B (en) * | 2019-05-30 | 2020-07-17 | 山东大学 | Liquefaction-resistant fabricated marine suction type foundation structure and construction method thereof |
| CN110670621B (en) * | 2019-09-03 | 2021-03-09 | 东南大学 | Assembly gravity type winged suction type caisson foundation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107663865A (en) * | 2017-11-14 | 2018-02-06 | 山东大学 | A kind of cable-stayed type immersed tube tunnel structure and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB0212003D0 (en) * | 2002-05-24 | 2002-07-03 | Stolt Offshore Sa | Seabed anchor |
| WO2004078576A2 (en) * | 2003-03-04 | 2004-09-16 | Exxonmobil Upstream Research Company | Anchor installation system |
| CN107700510A (en) * | 2017-09-29 | 2018-02-16 | 山西鑫联智慧科技股份有限公司 | A kind of pre-assembled formula open caisson |
| CN208586633U (en) * | 2018-07-26 | 2019-03-08 | 山东大学 | Assembled ocean suction caisson foundation structure |
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| CN107663865A (en) * | 2017-11-14 | 2018-02-06 | 山东大学 | A kind of cable-stayed type immersed tube tunnel structure and method |
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