A subsea oil storage tank foundation structure

Abstract

An underwater oil storage tank foundation structure provides support and protection for underwater oil storage tanks arranged near the port. It includes a protective cover plate, a ring skirt plate, a cross skirt plate, a reinforcing ring, a baffle, a pile foundation, an anti-sinking top plate, a fixed ring, a bottom plate, an anti-sinking bottom plate, and a fixed side plate. The main structure is buried below the seabed, and the weight of the entire structure is supported by the pile foundation, the anti-sinking top plate, the anti-sinking bottom plate, the ring skirt plate, and the cross skirt plate. The structural stability is enhanced by the reinforcing ring and the baffle plate. The underwater oil storage tank is protected and crude oil is transported by the protective cover plate, providing protection for the underwater oil storage tanks arranged near the coast.

Description

Technical Field

[0001] The invention relates to an underwater oil storage tank foundation structure, in particular to a foundation structure installed on the seabed and used for supporting a large underwater oil storage tank. Background Art

[0002] my country has a very high proportion of crude oil imports, and has also built a large number of storage tanks in some cities to receive imported crude oil. These storage tanks are usually built directly in the ports so that tankers can unload and store them on site.

[0003] Underwater oil storage has been developed in foreign countries for some time, and the technology is now mature and widely used. For my country's port oil storage system, it is often impossible to provide more new oil storage facilities within the port's land area, so the development of offshore underwater oil storage system is a feasible solution.

[0004] Underwater equipment requires supporting infrastructure to support it and ensure its long-term reliable operation underwater. The infrastructure of underwater equipment is a necessary supporting facility for underwater equipment. The infrastructure of underwater oil storage tanks not only needs to support the weight of the equipment and protect the equipment from damage, but also needs to ensure that it does not affect the navigation of ships and facilitates the loading and unloading of crude oil. Summary of the invention

[0005] In order to solve the problem of insufficient space for new land oil storage facilities and limited crude oil receiving capacity of ports, the present invention proposes an underwater oil storage tank infrastructure as a supporting facility for the development of offshore underwater oil storage tanks. The underwater oil storage tank infrastructure provided by the present invention can cooperate with underwater oil storage tanks to enhance offshore crude oil receiving capacity without affecting the navigation of ships, and at the same time support the full load weight of the oil storage tank for a long time during its life cycle, and protect the oil storage tank from threats such as falling objects in the water.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the main body of the underwater oil storage tank foundation structure proposed by the present invention is installed below the seabed. Before installation, a circular pit of a certain size needs to be excavated on the seabed to install the oil storage tank and the foundation structure. The oil storage tank foundation structure is provided with two layers of anti-sinking plates at the bottom of the pit and the seabed, as well as a pile foundation to support the full load weight of the oil storage tank. At the same time, the foundation structure is provided with a baffle to prevent the pit wall from collapsing. Finally, a protective structure covering the underwater oil storage tank is provided, which includes through holes for oil delivery and oil extraction pipelines, so as to ensure that the underwater oil storage tank is not threatened by falling objects in the water, anchors, etc. and has the function of crude oil transportation and storage.

[0007] An underwater oil storage tank foundation structure includes a ring skirt plate 9, a cross skirt plate 10, a protective cover plate 1, a reinforcement ring 2, a baffle plate 3, a pile foundation 4, an anti-sinking top plate 5, a fixing ring 6, a bottom plate 7, an anti-sinking bottom plate 8, and a fixing side plate 13; the pile foundation 4 is welded with an anti-sinking top plate 5 on the short side, and the fixing side plates 13 on the long and short sides, and are connected to each other through the reinforcement ring 2 and the baffle plate 3; the anti-sinking bottom plates 8 are symmetrically installed below the bottom plate 7, and the number of the anti-sinking bottom plates is 4;

[0008] The protective cover plate 1 is composed of a protective cover plate frame 1-1 and a cover plate petal 1-2; the lower end of the protective cover plate frame 1-1 is an octagonal structure, and each corner of the octagon has a column connected to the pile foundation 4 by welding; the cover plate petal 1-2 is welded on the protective cover plate frame 1-1; the pile foundation 4 is an "L"-shaped structure, connected to the protective cover plate frame 1-1 at the corner position, extending downward from one end of the corner, and a reinforcement ring 2 and a baffle 3 are welded at equal intervals; extending outward from the other end of the corner, an anti-sinking top plate 5 is welded between the outward extending parts of the two pile foundations 4; the bottom plate 7 is welded along the edge on the upper An annular fixing ring 6 structure is welded on the surface, the inner side of the fixing ring 6 is welded to the staggered I-beams on the bottom plate 7, and the outer side is connected to the pile foundation 4 by welding the upper reinforcing plate 11 and the I-beam; the bottom reinforcing ring 2 is welded to the outer side of the bottom plate 7; the inner side of the reinforcing ring 2 is welded to the bottom plate 7, and the outer side is welded to the pile foundation 4, the upper reinforcing plate 11 and the I-beam are welded on the upper surface, and the lower reinforcing plate 12 is welded on the lower surface; a cross skirt plate 10 is welded on the lower surface of the bottom plate 7, and an annular ring skirt plate 9 is welded on the edge of the lower surface; the anti-sinking bottom plate 8 is symmetrically welded and assembled around the cross skirt plate 10.

[0009] The upper end of the protective cover plate 1 has a circular opening.

[0010] The anti-sinking bottom plate 8 is a fan-shaped structure when viewed from above.

[0011] The beneficial effects of the present invention are as follows: the present invention proposes an underwater oil storage tank foundation structure that allows the underwater oil storage tank to be arranged on the seabed of offshore waters without affecting the navigation of ships, and protecting the oil storage tank from being threatened by fallen objects in the water and ship anchors. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 This is a schematic diagram of the present invention when the protective cover is not installed.

[0014] Figure 3 This is a schematic diagram of the present invention when the protective cover plate, baffle plate and anti-sinking top plate are not installed.

[0015] Figure 4 It is a schematic diagram of the bottom structure of the present invention.

[0016] Among them, 1. Protective cover plate, 1-1. Protective cover plate frame, 1-2. Cover plate petal, 2. Reinforcement ring, 3. Baffle, 4. Pile foundation, 5. Anti-sinking top plate, 6. Fixed ring, 7. Bottom plate, 8. Anti-sinking bottom plate, 9. Ring skirt plate, 10. Cross skirt plate, 11. Upper reinforcement plate, 12. Lower reinforcement plate, 13. Fixed side plate. DETAILED DESCRIPTION

[0017] Depend on Figure 1 , 2 As shown, the upper part of the present invention is a protective cover plate 1, which is composed of a protective cover plate frame 1-1 and a cover plate petal 1-2. The upper end of the protective cover plate frame 1-1 has a circular hole, which is the position of the pipeline through hole connected to the oil storage tank; the lower end of the protective cover plate frame 1-1 is an octagonal structure, and each corner of the octagon has a column connected to the pile foundation 4 by welding. The welding needs to be done last after the oil storage tank and the protective cover plate 1 are installed; the cover plate petals 1-2 are welded on the protective cover plate frame 1-1, and the number is 8. The pile foundation 4 is an "L"-shaped structure, connected to the protective cover plate frame 1-1 at the corner position, extending downward from one end of the corner, and the reinforcement ring 2 and the baffle 3 are welded at equal intervals; extending outward from the other end of the corner, the anti-sinking top plate 5 is welded between the outward extension parts of the two pile foundations 4; the fixed side plate 13 is welded outside the assembly position of the pile foundation 4, which is an "L"-shaped plate with narrow ends and wide in the middle.

[0018] Depend on Figure 2 , 3 As shown in Figure 4, the bottom plate 7 is the main load-bearing structure of the oil storage tank. It is a circular plate with holes, on which staggered I-beams are welded to play a reinforcing role. An annular fixed ring 6 structure is welded on the upper surface of the bottom plate 7 along the edge. The inner side of the fixed ring 6 is welded to the staggered I-beams on the bottom plate 7, and the outer side is connected to the pile foundation 4 by welding the upper reinforcing plate 11 and the I-beam. The bottom reinforcing ring 2 of the bottom plate 7 is welded on the outer side. The inner side of this layer of reinforcing ring 2 is welded to the bottom plate 7, and the outer side is welded to the pile foundation 4. The upper reinforcing plate 11 and the I-beam are welded on the upper surface, and the lower reinforcing plate 12 is welded on the lower surface. A cross skirt plate 10 is welded on the lower surface of the bottom plate 7, and an annular ring skirt plate 9 is welded on the edge of the lower surface. The anti-sinking bottom plate 8 is a sector-shaped nearly a quarter circle when viewed from above, and the edge of the sector arc is horizontal, and this position is welded to the lower surface of the bottom plate 7; it is an arc-shaped from the edge to the center of the circle, and the two sides of the sector are welded to the cross skirt plate 10. The anti-sinking bottom plate 8 is symmetrically welded and assembled around the cross skirt plate 10, and the number is 4. After the assembly is completed, the anti-sinking bottom plate 8 forms an arc surface with an opening upward. Figure 4 The bottom structure shown is only equipped with three anti-sinking bottom plates 8 .

[0019] Depend on Figure 1 , 2As shown in Figures 3 and 4, the underwater oil storage tank foundation structure involved in the present invention is arranged in the offshore position of the port because the underwater oil storage tank is considered to be a supplement to the port oil storage tank. In order to avoid affecting the navigation of ships, the underwater oil storage tank and its foundation structure are placed under the seabed as a whole. Except for the protective cover plate 1, the rest of the present invention is manufactured and assembled on land. During the installation process, it is first necessary to dig a cylindrical deep pit on the seabed, and then lower the rest of the overall device except the protective cover plate 1 into the deep pit. After lowering, the lower end of the pile foundation 4 needs to be driven into the bottom of the deep pit by a pile driver, and at the same time, the ring skirt plate 9, the cross skirt plate 10 part of the structure and the lower reinforcement plate 12 are embedded in the silt at the bottom of the deep pit. Because the deep pit will not form an ideal cylindrical space during the excavation operation, the bottom of the deep pit is an arc surface, and the side wall of the deep pit is a trumpet-shaped opening with a small bottom and a large top. The arc surface formed by the anti-sinking bottom plate 8 fits the arc surface of the pit bottom, and the bottom seawater can flow out through the through holes on the anti-sinking bottom plate 8 and the bottom plate 7. The fixed side panels 13 are embedded in the side walls of the deep pit during the installation process. The "L"-shaped structure of the fixed side panels 13 is designed to be thin at both ends and wide in the middle so that it can be embedded in the side walls of the deep pit with a small bottom and a large top, ensuring the stability of the foundation structure. The main function of the baffle 3 is to prevent the side walls of the deep pit from collapsing and damaging the oil storage tank. The reinforcing ring 2 strengthens the connection between the pile foundations 4 to keep the overall device stable when the baffle 3 or other structures are subjected to external forces. When the bottom structure of the underwater oil storage tank foundation structure of the present invention is installed, the anti-sinking top plate 5 is pressed on the seabed outside the deep pit to provide further load-bearing support for the overall structure. At this time, the underwater oil storage tank is installed, and the protective cover plate 1 is welded after the underwater oil storage tank is placed in the foundation structure. The protective cover plate 1 not only protects the underwater oil storage tank from falling objects, anchors, etc. in the water, but also serves as a part of the foundation structure to enhance the overall stability.

Claims

1. An underwater oil storage tank foundation structure, comprising a ring skirt plate (9) and a cross skirt plate (10), characterized in that: It comprises a protective cover plate (1), a reinforcement ring (2), a baffle plate (3), a pile foundation (4), an anti-sinking top plate (5), a fixing ring (6), a bottom plate (7), an anti-sinking bottom plate (8), and a fixing side plate (13); the anti-sinking top plate (5) is welded to the short side of the pile foundation (4), and the fixing side plates (13) are welded to the long and short sides, and are connected to each other via the reinforcement ring (2) and the baffle plate (3); the anti-sinking bottom plates (8) are symmetrically installed below the bottom plate (7), and the number of the anti-sinking bottom plates is 4; The protective cover plate (1) is composed of a protective cover plate frame (1-1) and a cover plate flap (1-2); the lower end of the protective cover plate frame (1-1) is an octagonal structure, and each corner of the octagon has a column connected to the pile foundation (4) by welding; the cover plate flap (1-2) is welded on the protective cover plate frame (1-1); the pile foundation (4) is an "L"-shaped structure, connected to the protective cover plate frame (1-1) at the corner, extending downward from one end of the corner, and having a reinforcing ring (2) and a baffle (3) welded at equal intervals; extending outward from the other end of the corner, an anti-sinking top plate (5) is welded between the outwardly extending parts of the two pile foundations (4); the bottom plate (7) is welded on the upper surface along the edge A ring-shaped fixing ring (6) structure is connected, the inner side of the fixing ring (6) is welded to the staggered I-beams on the bottom plate (7), and the outer side is connected to the pile foundation (4) by welding the upper reinforcing plate (11) and the I-beams; the outer side of the bottom plate (7) is welded to the reinforcing ring (2) at the bottom layer; the inner side of the reinforcing ring (2) is welded to the bottom plate (7), the outer side is welded to the pile foundation (4), the upper surface is welded to the upper reinforcing plate (11) and the I-beams, and the lower surface is welded to the lower reinforcing plate (12); the lower surface of the bottom plate (7) is welded to a cross skirt plate (10), and an annular ring skirt plate (9) is welded to the edge of the lower surface; the anti-sinking bottom plate (8) is symmetrically welded and assembled around the cross skirt plate (10).

2. The underwater oil storage tank foundation structure according to claim 1 is characterized in that: The upper end of the protective cover plate (1) has a circular opening.

3. The underwater oil storage tank foundation structure according to claim 1 is characterized in that: The anti-sinking bottom plate (8) is a fan-shaped structure when viewed from above.

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