Submarine fiber reinforced composite material box structure

Abstract

The utility model discloses a submarine fiber reinforced composite material box body structure, which comprises an FRP inner box body and an FRP outer box body, the FRP outer box body is sleeved on the FRP inner box body, a positioning connection structure is arranged between the FRP inner box body and the FRP outer box body, and a cavity between the FRP inner box body and the FRP outer box body is filled with a concrete layer. The cavity formed by sleeving the FRP inner box body and the FRP outer box body is filled with the concrete layer, a composite pressure bearing structure is formed, the corrosion resistance of an FRP material is reserved, the overall structural strength is improved through the compression resistance of concrete, and the submarine high-pressure environment is effectively adapted; the double-layer box body design provides physical isolation protection for the equipment, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of composite material application, especially to a seabed fiber reinforced composite material box structure. BACKGROUND

[0002] The seabed box is a key facility for storing and protecting underwater equipment in marine engineering, and is widely used in oil and gas development, scientific research observation, communication energy and military security fields. In the harsh marine environment, such box needs to withstand high pressure (such as 30MPa pressure resistance at 3000m water depth), resist seawater corrosion, cope with ocean current impact and earthquake load, and also ensure long-term sealing and structural stability. The common seabed box currently adopts steel welded structure or concrete caisson design, and cooperates with flat rubber gasket sealing, but these traditional structures have obvious defects: rigid connection leads to easy damage of equipment by vibration, ordinary sealing element is easy to fail under long-term water pressure fluctuation, and the overall design makes the maintenance cost high. SUMMARY

[0003] In order to solve the above problems, the utility model provides a seabed fiber reinforced composite material box structure.

[0004] The utility model provides a seabed fiber reinforced composite material box structure adopts the following technical scheme:

[0005] A seabed fiber reinforced composite material box structure, comprising an FRP inner box and an FRP outer box, the FRP outer box is sleeved on the FRP inner box, a positioning connection structure is arranged between the FRP inner box and the FRP outer box, and a concrete layer is filled in the cavity between the FRP inner box and the FRP outer box.

[0006] Through the above technical scheme, the cavity formed by the sleeving of the FRP inner box and the FRP outer box is filled with the concrete layer, forming a composite pressure-bearing structure, which not only retains the corrosion-resistant properties of FRP material, but also uses the compression resistance of concrete to improve the overall structural strength, effectively adapting to the high-pressure environment of seabed; The double-layer box design also provides physical isolation protection for the equipment, prolonging the service life.

[0007] As a preferred embodiment of the utility model, FRP reinforcing ribs are arranged on the inner wall of the FRP outer box and the outer wall of the FRP inner box.

[0008] Through the above technical scheme, the FRP reinforcing ribs are arranged on the inner and outer walls of the FRP inner and outer boxes, which significantly enhances the local bending stiffness and deformation resistance of the box, especially under the impact of water flow or earthquake load, the deformation of the box can be inhibited; The reinforcing rib with T-shaped cross section can also increase the contact area with the concrete layer to prevent the filling layer from falling off.

[0009] As the preferred of the utility model, the positioning connection structure includes connecting bolt rod, is provided with fixed hole respectively on the FRP inner box body, FRP outer box body, the connecting bolt rod is respectively worn in two fixed holes, and is locked through the nut, still be provided with sealing structure in the fixed hole.

[0010] Through the above technical scheme, the mechanical connection mode of connecting bolt rod cooperates with sealing structure is adopted, the accurate positioning and detachable connection of inner and outer box body are realized, and the construction maintenance is convenient;The sealing structure can prevent high-pressure seawater from penetrating into the cavity, and simultaneously allow the pressure change during the solidification of concrete, and avoid stress concentration at the connection.

[0011] As the preferred of the utility model, the sealing structure is the wedge-shaped rubber gasket, the wedge-shaped rubber gasket is sleeved on the connecting bolt rod, and the small-diameter end thereof is in abutment with the fixed hole, and the other end is in abutment with the locking nut.

[0012] Through the above technical scheme, the wedge-shaped rubber gasket expands radially under the pressure of the locking nut, and a dynamic sealing effect is formed, and the tapered structure can adaptively stretch the deformation of the connecting bolt rod, and still maintains sealing reliability under the condition of deep-sea pressure fluctuation, which is superior to the static sealing performance of the traditional flat gasket.

[0013] As the preferred of the utility model, the positioning connection structure includes connecting plate, and the connecting plate is fixedly connected with the inner wall of the FRP outer box body and the FRP reinforcing rib on the outer wall of the FRP inner box body.

[0014] Through the above technical scheme, the fixed connection of the connecting plate and the FRP reinforcing rib forms a distributed support network, and the load of the inner and outer box bodies is uniformly transmitted to the concrete layer, and the local stress is reduced;The design avoids opening holes on the box body, fundamentally eliminates the leakage risk, and is especially suitable for long-term immersion environment.

[0015] As the preferred of the utility model, the both ends of the connecting plate are respectively provided with clamping grooves, and the both ends of the connecting plate are respectively clamped with the FRP reinforcing rib through the clamping grooves.

[0016] Through the above technical scheme, the plug-in connection of the clamping groove and the FRP reinforcing rib simplifies the assembly process, and the quick positioning can be realized without welding or gluing, and the clamping structure allows the slight displacement of the box body due to temperature change, and avoids material fatigue cracking caused by rigid connection.

[0017] As the preferred of the utility model, the cross section of the FRP reinforcing rib is T-shaped structure, and the clamping groove is T-shaped groove.

[0018] Through the technical scheme, the T-shaped reinforcing rib and the T-shaped groove form a three-dimensional interlocking structure, which greatly enhances the shear resistance between the connecting plate and the box, effectively resists displacement movement when the ocean current impacts transversely, and maintains the structural integrity of the concrete filling layer.

[0019] As a preferred embodiment of the utility model, the FRP outer box body and the FRP inner box body are formed by multiple segments, and adjacent segments are fixedly connected through connecting pieces.

[0020] Through the technical scheme, the manufacturing and transportation feasibility of the large box body are significantly improved through segmented design, the size and weight of a single piece are reduced through segmented prefabrication, the whole box hoisting problem in deep sea engineering is solved, the connecting piece fixing mode allows rapid assembly on site, meets the flexible deployment requirements under complex seabed terrain conditions, facilitates local replacement of damaged segments, and reduces maintenance costs.

[0021] As a preferred embodiment of the utility model, the connecting piece comprises a C-shaped connecting block, two clamping grooves are arranged at one end of the C-shaped connecting block, and the clamping grooves are matched with the FRP reinforcing ribs.

[0022] Through the technical scheme, the double clamping groove design of the C-shaped connecting block realizes mechanical interlocking of adjacent box segments, the T-shaped structure of the reinforcing rib and the precise matching of the clamping groove form a three-dimensional connecting node with strong shear resistance, the standardized connecting piece simplifies the assembly process, and the reinforcing rib network realizes rapid alignment and rigid fixation of the multiple segment box, thereby ensuring the continuity and overall pressure bearing performance of the concrete filling layer.

[0023] In summary, the utility model has at least one of the following beneficial technical effects:

[0024] 1、The utility model discloses a double-layer design of FRP (glass steel) inner box body and outer box body, and fills a concrete layer in the cavity between the two, forming a "FRP-concrete-FRP" composite structure. FRP material has excellent seawater corrosion resistance and can resist salt spray and microbial corrosion in the marine environment for a long time. The concrete layer provides high compressive strength, enabling the box to withstand deep-sea high pressure. This combination not only overcomes the corrosion problem of pure steel boxes, but also makes up for the lack of toughness of pure concrete boxes. In addition, the setting of FRP reinforcing ribs further improves the overall stiffness of the box, enabling it to maintain structural stability under ocean current impact or seismic load and prolong service life.

[0025] 2. This utility model employs two optional positioning and connection structures: one is a mechanical fastening method using a connecting bolt and a wedge-shaped rubber washer; the other is a snap-fit ​​method using a connecting plate and a T-shaped reinforcing rib. The connecting bolt solution achieves dynamic sealing through the wedge-shaped rubber washer, maintaining a tight seal even under pressure fluctuations in the deep sea and preventing seawater infiltration. The snap-fit ​​method, on the other hand, avoids drilling holes in the tank body, fundamentally eliminating the risk of leakage. Both connection methods support modular assembly, facilitating construction, inspection, or component replacement, and reducing maintenance costs. Furthermore, the interlocking structure of the T-shaped reinforcing rib and T-slot enhances shear resistance, ensuring a stable connection of the tank body in complex marine environments, suitable for long-term deep-sea operations.

[0026] 3. Through the segmented box design and the application of C-shaped connecting blocks, comprehensive optimization of adaptability to large-scale structural engineering, improved assembly reliability, and life-cycle economic efficiency has been achieved. The multi-segment splicing scheme breaks through the molding size limitations of FRP materials, allowing the box to flexibly adapt to the ultra-large size requirements of kilometer-level deep-sea projects. At the same time, segmented transportation significantly reduces logistics costs. The interlocking combination of C-shaped connecting blocks and T-shaped reinforcing ribs forms a distributed connection system. Its mechanical interlocking characteristics can maintain the sealing integrity of the splice joints even under the impact of ocean currents, preventing water seepage and deterioration of the concrete layer. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the submarine fiber-reinforced composite material box structure of Embodiment 1 of this utility model.

[0028] Figure 2 This is a cross-sectional view of the submarine fiber-reinforced composite material box structure of Embodiment 1 of this utility model.

[0029] Figure 3 This is a schematic diagram of the structure of the submarine fiber-reinforced composite material box structure of Embodiment 2 of this utility model.

[0030] Figure 4 This is a cross-sectional view of the submarine fiber-reinforced composite material box structure of Embodiment 2 of this utility model.

[0031] Figure 5 This is a cross-sectional view of the submarine fiber-reinforced composite material box structure of Embodiment 3 of this utility model.

[0032] Figure 6 This is a schematic diagram of the C-shaped connecting block in Embodiment 3 of this utility model.

[0033] Explanation of reference numerals in the attached drawings: 1. FRP inner casing; 2. FRP outer casing; 3. Concrete layer; 4. FRP reinforcing rib; 5. Connecting bolt; 6. Fixing hole; 7. Locking nut; 8. Wedge rubber washer; 9. Cavity; 10. Connecting plate; 11. Slot; 12. Lower cover; 13. C-shaped connecting block. DETAILED DESCRIPTION

[0034] The application will be further described below in conjunction with the accompanying drawings Figures 1-6 The application will be further described below in conjunction with the accompanying drawings

[0035] Embodiment 1

[0036] With reference to Figures 1 to 2 The embodiment discloses a kind of seabed fiber reinforced composite box structures, including FRP inner box 1, FRP outer box 2, in the embodiment, FRP inner box 1 and FRP outer box 2 section are rectangular structure, FRP inner box 1 and FRP outer box 2 are made of glass steel extrusion forming, FRP reinforcing rib 4 is arranged on the inner wall of the described FRP outer box 2 and the outer wall of FRP inner box 1.In the embodiment, FRP reinforcing rib 4 is made of extrusion forming with FRP inner box 1, FRP outer box 2, and reinforcing rib 4 section is T-shaped structure, by setting up reinforcing rib 4, the strength of FRP inner box 1 and FRP outer box 2 can be improved, under the same strength requirement, the requirement of the thickness of FRP inner box 1, FRP outer box 2 can be effectively reduced, material use is reduced, cost is reduced.

[0037] FRP outer box 2 is set on the FRP inner box 1, and positioning connection structure is arranged between the FRP inner box 1 and the FRP outer box 2, and concrete layer 3 is filled in the cavity 9 between the FRP inner box 1 and the FRP outer box 2.By filling concrete layer 3, the strength and rigidity of the seabed box formed by FRP inner box 1 and FRP outer box 2 can be large, and the seabed pressure can be resisted.Meanwhile, concrete layer 3 can be combined with FRP reinforcing rib 4 in cavity 9, to ensure that concrete layer 3 is combined tightly in cavity 9 without falling off.

[0038] FRP upper cover body (not shown in the figure) and FRP lower cover body 12 are also made of glass steel material and are arranged on both sides (upper and lower ends) of the length direction of FRP inner box 1 and FRP outer box 2.

[0039] With reference to Figure 2In the embodiment, the positioning and connecting structure comprises connecting rods 5, and fixing holes 6 are arranged on the FRP inner box 1 and the FRP outer box 2 respectively, the connecting rods 6 are arranged in the fixing holes 6 respectively, and the connecting rods 6 are locked by lock nuts 7, and sealing structures are arranged in the fixing holes 6. In the embodiment, the number of the connecting rods 6 is determined according to the size of the box, the sealing structure is a notch-shaped rubber ring 8, the notch-shaped rubber ring 8 is sleeved on the connecting rod 5, one end of the notch-shaped rubber ring 8 abuts against the fixing hole 6, and the other end of the notch-shaped rubber ring 8 abuts against the lock nut 7. The notch-shaped rubber ring 8 can prevent seawater from entering the box through the fixing hole 6, and the notch-shaped rubber ring 8 is compressed due to the fact that the cavity 9 is filled with concrete, the connecting rod 5 is pulled tight, and the sealing performance is ensured. In the embodiment, the notch-shaped rubber ring 8 is made of an anticorrosive material, such as EPDM rubber and fluororubber.

[0040] Embodiment 2

[0041] With reference to Figure 3 and Figure 4 The rest of the embodiment is the same as Embodiment 1, except that, in the embodiment, the positioning and connecting structure comprises a connecting plate 8, and the connecting plate 8 is fixedly connected with the inner wall of the FRP outer box 2 and the FRP reinforcing rib 4 on the outer wall of the FRP inner box 1 respectively.

[0042] In the embodiment, the connecting plate 8 is also made of glass steel and is extruded, and the connecting plate 8 is provided with clamping grooves 11 at two ends, the cross section of the clamping grooves 11 is the same as the cross section of the FRP reinforcing rib 4, and is also a T-shaped structure, and the two ends of the connecting plate 8 are clamped with the FRP reinforcing rib 4 through the clamping grooves 11, so that the positioning and connecting of the FRP inner box 1 and the FRP outer box 2 are completed, and the holes in the FRP inner box 1 or the FRP outer box 2 are not needed, so that the leakage is prevented.

[0043] Embodiment 3

[0044] With reference to Figure 5 and Figure 6 The rest of the embodiment is the same as Embodiment 2, except that, in the embodiment, the size of the inner box 1 and the outer box 2 is large, and the inner box 1 and the outer box 2 are arranged in a segmented structure for easy processing, and the inner box 1 and the outer box 2 are formed by splicing.

[0045] In the embodiment, the C-shaped connecting block 13 is arranged to connect two adjacent segments of the inner box 1 or the outer box 2, and the C-shaped connecting block 13 is arranged on the FRP reinforcing rib 4 of the inner box 1 or the outer box 2. Figure 6The C-shaped connecting block 13 is prepared by extrusion molding of FRP material, two T-shaped clamping grooves 11 are arranged on the same side of the C-shaped connecting block 13, the T-shaped clamping grooves 11 are the same as the cross section of the FRP reinforcing rib 4, and the splicing of the adjacent two sections of the inner tank 1 or the outer tank 2 can be completed by clamping the two clamping grooves 11 of the C-shaped connecting block 13 into the FRP reinforcing rib 4 on the inner tank 1 or the outer tank 2 respectively.

[0046] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A subsea fibre reinforced composite tank structure, characterised in that: The utility model relates to a FRP inner box (1), FRP outer box (2), the FRP outer box (2) sets up on the FRP inner box (1), is provided with positioning connecting structure between FRP inner box (1) and FRP outer box (2), fills concrete layer (3) in the cavity (9) between FRP inner box (1) and FRP outer box (2).

2. The subsea fiber reinforced composite tank structure of claim 1, wherein: The inner wall of the FRP outer box (2) and the outer wall of the FRP inner box (1) are provided with FRP reinforcing ribs (4).

3. The subsea fibre-reinforced composite tub structure according to claim 1 or 2, characterised in that: The positioning connecting structure includes a connecting bolt (5), and the FRP inner box (1) and the FRP outer box (2) are respectively provided with fixing holes (6), the connecting bolt (5) is respectively arranged in the two fixing holes (6) and locked by a locking nut (7), and a sealing structure is further arranged in the fixing hole (6).

4. The subsea fiber reinforced composite tank structure of claim 3, wherein: The sealing structure is a notched rubber gasket (8), the notched rubber gasket (8) is arranged on the connecting bolt (5), one end of the notched rubber gasket (8) abuts against the fixing hole (6), and the other end abuts against the locking nut (7).

5. The subsea fiber reinforced composite tank structure of claim 2, wherein: The positioning connecting structure includes a connecting plate (10), and the connecting plate (10) is fixedly connected with the FRP reinforcing ribs (4) on the inner wall of the FRP outer box (2) and the outer wall of the FRP inner box (1).

6. The subsea fiber reinforced composite tank structure of claim 5, wherein: The two ends of the connecting plate (10) are respectively provided with clamping grooves (11), and the two ends of the connecting plate (10) are respectively clamped with the FRP reinforcing ribs (4) through the clamping grooves (11).

7. The subsea fiber reinforced composite tank structure of claim 6, wherein: The FRP reinforcing rib (4) is in T-shaped structure, and the clamping groove (11) is a T-shaped groove.

8. The subsea fiber reinforced composite tank structure of claim 2, wherein: The FRP outer box (2) and the FRP inner box (1) are formed by multiple splicing, and adjacent parts are fixedly connected through connecting pieces.

9. The subsea fiber reinforced composite tank structure of claim 8, wherein: The connecting piece includes a C-shaped connecting block (13), two clamping grooves (11) are arranged at one end of the C-shaped connecting block (13), and the clamping grooves (11) are matched with the FRP reinforcing ribs (4).

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