CN110080269B - Liquefaction-resistant fabricated marine suction type foundation structure and construction method thereof - Google Patents
Liquefaction-resistant fabricated marine suction type foundation structure and construction method thereof Download PDFInfo
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- CN110080269B CN110080269B CN201910462807.XA CN201910462807A CN110080269B CN 110080269 B CN110080269 B CN 110080269B CN 201910462807 A CN201910462807 A CN 201910462807A CN 110080269 B CN110080269 B CN 110080269B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
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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
- E02D27/24—Foundations constructed by making use of diving-bells
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Abstract
The invention discloses an anti-liquefaction assembly type marine suction foundation structure and a construction method thereof, wherein the anti-liquefaction assembly type marine suction foundation structure comprises a first barrel structure and a plurality of second barrel structures; the top and the bottom of the first barrel structure are both open, the bottom is pointed, and the top is provided with a clamping groove; the top and the bottom of the second barrel structure are both open, the bottom and the top are both provided with a clamping groove, and the second barrel structures are sequentially clamped together from top to bottom; the first barrel structure is positioned at the bottommost end of the suction type base structure, the top of the first barrel structure is clamped with the bottom of the second barrel structure positioned at the bottommost end, and the second barrel structure positioned at the topmost end is connected with a circular steel plate; and damping devices for connecting the adjacent cylinder structures are arranged at the clamping positions of the adjacent cylinder structures.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering and ocean engineering, in particular to a novel ocean suction type foundation structure for building an ocean exploitation platform in liquefied strata such as ocean soft clay or sandy soil.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The suction type foundation structure is a large-diameter steel drum structure with an open bottom end and a closed upper end, has the advantages of low manufacturing cost, reusability and the like, and is increasingly applied to deepwater ocean platform engineering. The inventor has found that transportation and installation are relatively complex due to the large size of the marine suction foundation structure; meanwhile, the large-volume suction type foundation structure sinks into the seabed under the action of internal and external pressure difference in the field installation process, air is stored in the large-volume suction type foundation structure due to the fact that soft clay or sandy soil in the seabed stratum is not uniform, the situation that the suction type foundation structure sinks into the seabed completely cannot be met, unstable potential safety hazards exist in the suction type foundation structure, the upper ocean exploitation platform is prone to overturning and deforming, and therefore life safety of constructors is endangered, and production equipment is damaged. In addition, a large amount of manpower, equipment and financial resources are required to be input in the construction process of the large-volume suction type foundation structure, and meanwhile, the construction risk is increased. Meanwhile, the loose seabed soil layer is often subjected to soil layer structure deformation under the action of dynamic loads such as earthquakes or waves, the soil body loses strength and bearing capacity partially or completely, liquefaction occurs, and then structures on the upper portion of the ocean foundation are subjected to strong uneven settlement and even toppling, so that great harm is caused.
With the continuous development of Chinese ocean resources to deep sea, the traditional ocean suction type foundation structure can not ensure the development requirement of the ocean resources for rapidness and high efficiency, so the development and the application of the suction type foundation structure are restricted.
Disclosure of Invention
The invention aims to solve the problems and provides an assembly type marine suction type foundation structure suitable for a liquefied stratum and a construction method thereof, the structure can efficiently improve the installation speed and the application range of the suction type foundation structure, reduce the instability damage of the suction type foundation structure, permanently improve the self-stability performance of the suction type foundation structure, effectively relieve the coupling effect between severe marine environment and variable seabed stratums, and ensure the personnel safety and equipment operation during the construction and operation of an upper marine exploitation platform.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-liquefaction assembly type marine suction foundation structure comprises a first barrel structure and a plurality of second barrel structures; the top and the bottom of the first barrel structure are both open, the bottom is pointed, and the top is provided with a clamping groove; the top and the bottom of the second barrel structures are both open, the bottom and the top are both provided with a clamping groove, a plurality of second barrel structures are sequentially clamped together from top to bottom and then are connected with the first barrel structure, the first barrel structure is positioned at the bottommost end, and the top of the first barrel structure is clamped with the bottom of the second barrel structure positioned at the bottommost end;
and damping devices for connecting the adjacent drum structures are arranged at the clamping positions of the adjacent drum structures.
As a further technical scheme, the damping device comprises a hollow rectangular steel airtight body, a sliding plate is horizontally arranged in the hollow rectangular steel airtight body, and the top of the sliding plate is connected with the top of the hollow rectangular steel airtight body through a first spring; the bottom of the sliding plate is connected with the bottom of the hollow rectangular steel airtight body through a second spring, the bottom of the sliding plate is also provided with a lower connecting rod, and the lower connecting rod extends out of the hollow rectangular steel airtight body; the lower connecting rod and the hollow rectangular steel airtight body are respectively fixed on two connected barrel structures.
As a further technical solution, a plurality of damping devices are provided between adjacent drum structures, the plurality of damping devices being provided outside and/or inside the drum structures.
As a further technical scheme, a lower connecting rod of the damping device is connected with a barrel structure positioned below; the hollow rectangular steel obturator is connected with the barrel structure positioned above the hollow rectangular steel obturator.
As a further technical scheme, a lower connecting rod of the damping device is connected with an upper barrel structure; the hollow rectangular steel airtight body is connected with a barrel structure positioned below.
As a further technical scheme, threads are arranged on the groove walls of the clamping grooves, and adjacent barrel structures are screwed together through the threads.
As a further technical scheme, the outer side wall of the circular steel plate is provided with threads, and the second barrel structure positioned at the top is screwed with the circular steel plate through the threads.
The invention also provides a construction method of the liquefaction-resistant assembled marine suction type foundation structure;
and 7, repeating the steps 4 to 6, and installing suction type base structures with other sections until the design requirements are met.
The working principle of this patent does:
the round steel plate is connected with the multi-section barrel structure, so that the multi-section barrel structure becomes a multi-section small suction type base 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 barrel structure settlement caused by uneven stratum, air in the barrel body and the like, permanently improve the stability of the foundation of the suction type foundation structure and effectively reduce the instability and deformation of the suction type foundation structure in the weak stratum; in addition, the length of the original suction type foundation structure is reduced, so that the foundation structure has certain flexibility, can effectively adapt to unfavorable geological conditions such as a weak seabed and the like, and has adjustability. Meanwhile, all the sections of suction type base structures are connected through four damping devices, so that the coupling effect between a severe marine environment and a variable seabed stratum can be effectively relieved, and the stability and the safety of the upper marine working platform are guaranteed.
The beneficial effect of this patent does:
according to the invention, the round steel plate is connected with the multi-section barrel structure, so that the multi-section barrel structure becomes a multi-section small suction type base structure, and the multi-section small suction type base structure 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 barrel structure settlement caused by uneven stratum, air in the barrel body and the like, permanently improve the stability of the foundation of the suction type foundation structure and effectively reduce the instability and deformation of the suction type foundation structure in the weak stratum; in addition, the length of the original suction type foundation structure is reduced, so that the foundation structure has certain flexibility, can effectively adapt to unfavorable geological conditions such as a weak seabed and the like, and has adjustability. Meanwhile, damping devices are additionally arranged among the sections of suction type base structures, so that the coupling effect between the severe marine environment and the changeable seabed stratum can be effectively relieved.
(2) The aspect of the stability of the suction type foundation structure is as follows: the application range of the suction type foundation structure can be effectively enlarged, the instability damage of the foundation of the suction type foundation structure is reduced, the self-stability performance of the suction type foundation structure is improved durably, and the personnel safety and equipment operation during the construction and operation of the suction type foundation structure are ensured.
(3) Adaptability to severe geological conditions: the defects of overlong original suction type foundation structure, poor flexible deformation adaptability and the like are overcome, the foundation structure has certain flexibility, can effectively adapt to poor geological conditions such as soft seabed and the like, and has adjustability.
(4) Construction aspect: the suction type foundation structure is used as a deep foundation structure of an offshore oil exploitation platform, and the construction process is mature, convenient and fast.
Drawings
The accompanying drawings, which 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 are not intended to limit the application.
Fig. 1 and 2 are schematic diagrams of circular steel plates in a liquefaction-resistant fabricated marine suction foundation structure.
Fig. 3 is a longitudinal sectional view of a first pitch drum structure in the liquefaction-resistant fabricated marine suction foundation structure.
Fig. 4 is a longitudinal sectional view of other pitch drum structures in the liquefaction-resistant fabricated marine suction foundation structure.
Fig. 5 is a schematic view of a damping device in a liquefaction resistant fabricated marine suction foundation structure.
Fig. 6 is a longitudinal sectional view of a damping device in the liquefaction-resistant fabricated marine suction foundation structure.
Fig. 7 is a schematic view of the installation position of a damping device in the liquefaction-resistant fabricated marine suction foundation structure.
Fig. 8 is a longitudinal sectional view of the installation position of the damping device in the liquefaction-resistant fabricated marine suction type base structure.
Wherein, the unit: m; 1. a circular steel plate; 2. a first pitch barrel configuration; 3. the barrel structure of other sections; 4. a hollow rectangular steel obturator; 5. a first spring; 6. a slide plate; 7. a second spring; 8. a lower connecting rod; 9. a damping device.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: the terms "mounted," "connected," "fixed," and the like in the present invention are to be understood in a broad sense, and for example, the terms "mounted," "connected," and "fixed" may be fixed, detachable, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As introduced by the background, there are deficiencies in the prior art to address the above
In order to solve the technical problem, the application provides an anti-liquefaction fabricated marine suction type foundation structure and a construction method thereof; therefore, a novel suction type foundation structure is formed by the assembly type structure concept and the marine suction type foundation structure, and by means of the construction method of the assembly type structure, the assembly type marine suction type foundation structure suitable for the liquefied stratum is provided so as to meet the requirements of construction and stability of an underwater structure in a marine area.
In a typical embodiment of the present application, the liquefaction resistant fabricated marine suction foundation structure comprises a first drum structure and a plurality of second drum structures; the top and the bottom of the first barrel structure are both open, the bottom is pointed, and the top is provided with a clamping groove; the top and the bottom of the second barrel structure are both open, the bottom and the top are both provided with a clamping groove, and the second barrel structures are sequentially clamped together from top to bottom; the first barrel structure is positioned at the bottommost end of the suction type base structure, the top of the first barrel structure is clamped with the bottom of the second barrel structure positioned at the bottommost end, and the second barrel structure positioned at the topmost end is connected with a circular steel plate; damping devices for connecting the adjacent barrel structures are arranged at the clamping positions of the adjacent barrel structures; the specific structure is as follows:
as shown in fig. 1 and 2, the circular steel plate has a diameter of 9.9m and a height of 0.2 m; the diameter of the steel plate is slightly smaller than the size of the barrel, and further, threads can be arranged on the outer ring of the round steel plate; which is connected to the top of the drum by a screw thread.
As shown in fig. 3, the drum size of the first section of the fabricated marine suction foundation structure may be 10m in diameter, 3m in height, and 0.05m in thickness; the structure is that the top and the bottom are both open, the bottom is pointed, and the top is provided with a clamping groove; the side wall of the clamping groove is provided with a thread; the pitch barrel is located at the lowest end of the whole foundation structure, and the bottom is designed to be pointed mainly for facilitating the installation on the seabed.
The clamping groove is arranged along the circumferential direction of the barrel and is an annular groove which is positioned on the inner side of the side wall of the barrel.
Furthermore, the inner side wall of the annular groove is provided with threads for connecting with a circular steel plate or other drums.
As shown in fig. 4, the drums of other sections of the fabricated marine suction foundation structure are completely the same, and the specific dimensions are 10m in diameter, 3m in height and 0.05m in thickness; the specific structure is that the top and the bottom of the drum structure are both open, the bottom and the top are both provided with a clamping groove, and a plurality of second drum structures are sequentially clamped together from top to bottom; the clamping grooves at the top and the bottom of the barrel have the same structure and different positions, the clamping groove at the top is positioned at the inner side of the barrel wall, and the clamping groove at the bottom is positioned at the outer side of the barrel wall, and the clamping grooves are specifically shown in the attached drawings;
the clamping groove is arranged along the circumferential direction of the barrel and is an annular groove.
Furthermore, the inner side wall of the upper annular groove is provided with threads for connecting with a circular steel plate or other drums; the outer side wall of the lower annular groove is provided with threads for connecting with other drums;
as shown in fig. 5 and 6, the damping device comprises a hollow rectangular steel airtight body, a sliding plate is horizontally arranged in the hollow rectangular steel airtight body, and the top of the sliding plate is connected with the top of the hollow rectangular steel airtight body through a first spring; the bottom of the sliding plate is connected with the bottom of the hollow rectangular steel airtight body through a second spring, the bottom of the sliding plate is also provided with a lower connecting rod, and the lower connecting rod extends out of the hollow rectangular steel airtight body; the lower connecting rod and the hollow rectangular steel airtight body are respectively fixed on two connected barrel structures, and specifically, the size of the hollow rectangular steel airtight body is 20cm in length, 10cm in width and 10cm in thickness in combination with the attached drawing; the inner part of the horizontal sliding plate is divided into an upper part and a lower part by the horizontal sliding plate, wherein the thickness of the horizontal sliding plate can be 5 cm; the top and the bottom of the horizontal sliding plate are connected with the hollow rectangular steel airtight body through a spring, the bottom of the horizontal sliding plate and the lower connecting rod are welded into a whole, the lower connecting rod extends out of the hollow rectangular steel airtight body, and the horizontal sliding plate slides up and down along with the extension of the lower connecting rod.
The specific mounting mode of damping device has two kinds of modes, and first mounting mode is: the lower connecting rod of the damping device is connected with the barrel structure positioned below, and the hollow rectangular steel airtight body is connected with the barrel structure positioned above; the second mounting mode is as follows: the lower connecting rod of the damping device is connected with the barrel structure positioned above the damping device; the hollow rectangular steel airtight body is connected with a barrel structure positioned below.
In addition, during actual installation, only one of the above installation modes can be adopted between the adjacent drum structures, and the two installation modes can also be adopted simultaneously.
Further, the damping devices can be arranged on the inner wall and the outer wall of the drum structure, and the two damping devices which are positioned at the same position adopt the first mounting mode and the second mounting mode.
Furthermore, a plurality of damping devices can be arranged between two adjacent barrel structures, and the specific installation number can be selected according to the actual situation; in the attached drawing of the embodiment, 8 damping devices are arranged between two adjacent drum structures, 4 damping devices are arranged on the outer wall of the drum structure, 4 damping devices are arranged on the inner wall of the drum structure, the inner damping device and the outer damping device are corresponding, and the installation directions are opposite. The suction type foundation structures are connected through the four damping devices, so that the coupling effect between a severe marine environment and a changeable seabed stratum can be effectively relieved, and the stability and the safety of the upper marine working platform are guaranteed.
The embodiment also provides a construction method of the liquefaction-resistant fabricated marine suction foundation structure, which 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 0.05 m; circular steel plates with the diameter of 9.9m and the height of 0.2m can be prefabricated in a prefabrication factory.
(2) First pitch drum structure mounting
The first section of the round barrel structure is connected with the round steel plate, the first section of the round barrel structure is sunk into the seabed by utilizing the internal and external pressure difference, and then the round steel plate is hoisted.
(3) Other barrel structure mounting
And connecting the second section of the cylindrical structure with the circular steel plate to form a second section of suction type foundation structure, sinking the second section of the cylindrical structure into the seabed by utilizing the internal and external pressure difference, connecting the bottom of the second section of the suction type foundation structure with the top of the first section of the suction type foundation structure, and hoisting the circular steel plate. The installation method of other sections of the barrel structures is the same. Thereby combining and assembling the components to form a complete suction type foundation structure.
(4) Damper installation
When the upper and lower sections of the circular barrel structures are installed, damping devices are installed inside and outside the barrel body at the joint of the upper and lower sections of the circular barrel structures, as shown in fig. 7 and 8.
The invention connects the round steel plate with the multi-section barrel structure, so that the multi-section barrel structure becomes a multi-section small suction type base structure, and the multi-section small suction type base structure 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 barrel structure settlement caused by uneven stratum, air in the barrel body and the like, permanently improve the stability of the foundation of the suction type foundation structure and effectively reduce the instability and deformation of the suction type foundation structure in the weak stratum; in addition, the length of the original suction type foundation structure is reduced, so that the foundation structure has certain flexibility, can effectively adapt to unfavorable geological conditions such as a weak seabed and the like, and has adjustability. Meanwhile, all the sections of suction type base structures are connected through four damping devices, so that the coupling effect between a severe marine environment and a variable seabed stratum can be effectively relieved, and the stability and the safety of the upper marine working platform are guaranteed.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and those skilled in the art should understand that they can make various modifications and changes without inventive changes based on the technical solutions of the present invention.
Claims (5)
1. An anti-liquefaction assembly type marine suction foundation structure is characterized by comprising a first barrel structure and a plurality of second barrel structures; the top and the bottom of the first barrel structure are both open, the bottom is pointed, and the top is provided with a clamping groove; the top and the bottom of the second barrel structures are both open, the bottom and the top are both provided with a clamping groove, and the second barrel structures are sequentially clamped together from top to bottom and then connected with the first barrel structure; the first barrel structure is positioned at the bottommost end of the suction type base structure, the top of the first barrel structure is clamped with the bottom of the second barrel structure positioned at the bottommost end, and the second barrel structure positioned at the topmost end is connected with a circular steel plate; damping devices for connecting the adjacent barrel structures are arranged at the clamping positions of the adjacent barrel structures, so that the device is suitable for poor geological conditions of a soft seabed;
the damping device comprises a hollow rectangular steel airtight body, a sliding plate is horizontally arranged in the hollow rectangular steel airtight body, and the top of the sliding plate is connected with the top of the hollow rectangular steel airtight body through a first spring; the bottom of the sliding plate is connected with the bottom of the hollow rectangular steel airtight body through a second spring, the bottom of the sliding plate is also provided with a lower connecting rod, and the lower connecting rod extends out of the hollow rectangular steel airtight body; the lower connecting rod and the hollow rectangular steel airtight body are respectively fixed on two connected barrel structures;
the lower connecting rod of the damping device is connected with the barrel structure positioned below, and the hollow rectangular steel airtight body is connected with the barrel structure positioned above; and/or the lower connecting rod of the damping device is connected with the barrel structure positioned above, and the hollow rectangular steel airtight body is connected with the barrel structure positioned below.
2. The liquefaction resistant fabricated marine suction foundation structure of claim 1, wherein a plurality of damping devices are disposed between adjacent drum structures, the plurality of damping devices being disposed outside and/or inside the drum structures.
3. The liquefaction resistant fabricated marine suction foundation structure of claim 1, wherein threads are provided on the wall of the snap-in groove, and adjacent drum structures are screwed together by the threads.
4. The liquefaction resistant fabricated marine suction foundation structure of claim 1,
the outer side wall of the circular steel plate is provided with threads, and the second barrel structure positioned at the top is screwed with the circular steel plate through the threads.
5. The method of constructing a liquefaction resistant fabricated marine suction foundation structure of any one of claims 1 to 4,
step 1, mounting a circular steel plate on the top of a first section of a circular barrel structure to form a suction type base structure, namely the first section of suction type base structure;
step 2, applying pressure difference inside and outside the first section of suction type foundation structure, and installing the first section of suction type foundation structure;
step 3, after the first section of suction type base structure is installed, separating the circular steel plate from the first section of barrel structure;
step 4, connecting the circular steel plate with the top of the second-section circular barrel structure to form a second-section suction type base structure;
step 5, applying pressure difference inside and outside the second section of suction type foundation structure, connecting the bottom of the second section of suction type foundation structure with the top of the first section of suction type foundation structure, and installing the second section of suction type foundation structure;
step 6, installing a damping device at the connecting position of the second section of suction type foundation structure and the first section of suction type foundation structure;
and 7, repeating the steps 4 to 6, and installing suction type base structures with other sections until the design requirements are met.
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| CN201910462807.XA CN110080269B (en) | 2019-05-30 | 2019-05-30 | Liquefaction-resistant fabricated marine suction type foundation structure and construction method thereof |
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| JP3518379B2 (en) * | 1998-12-09 | 2004-04-12 | 株式会社大林組 | Construction method for underwater structures |
| CN206245332U (en) * | 2016-12-13 | 2017-06-13 | 山东科技大学 | A kind of anti-rotating skirt-type suction basis |
| CN208662170U (en) * | 2018-07-06 | 2019-03-29 | 湘潭市霞城电工有限公司 | A kind of copper extruder with shock-absorbing function |
| CN108677990B (en) * | 2018-07-26 | 2023-06-02 | 山东大学 | Assembled ocean suction type caisson foundation structure and construction method thereof |
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