Marine pipe cable anti-bending device and internal metal insert

Abstract

The utility model discloses a marine pipe cable anti-bending device and internal metal insert, including the hooping flange plate and the bottom plate that are arranged in parallel, the hooping flange plate is uniformly provided with first positioning mounting holes, the bottom plate is uniformly provided with second positioning mounting holes, the first positioning mounting holes and the second positioning mounting holes are in one-to-one correspondence, and the first positioning mounting holes and the second positioning mounting holes are in one-to-one correspondence. A connecting rod is arranged between the first positioning mounting hole and the second positioning mounting hole, positioning step grooves are formed in the first positioning mounting hole and the second positioning mounting hole corresponding to the connecting rod, the end of the connecting rod extends into the positioning step grooves, a screw section is further arranged at the end of the connecting rod, and the screw section is connected with the connecting rod. The screw rod section penetrates through the second positioning mounting hole, the connecting rod and the first positioning mounting hole are fixed through a bolt, and a reinforcing cylinder is arranged in the middle of the bottom plate. The utility model has the advantages of higher production quality, convenience in assembly and stability and reliability in use.

Description

Technical Field

[0001] The utility model relates to the technical field of ocean engineering, and particularly relates to an ocean pipe and cable anti-bending device and an internal metal insert. Background Art

[0002] The ocean pipe and cable anti-bending device is a key equipment connecting offshore floating bodies or subsea wellheads, and is known as the "blood vessels" of the ocean floating production system. During service, due to the action of wind, wave, current and floating body movement, the connection parts between the riser, dynamic cable and the floating body will be damaged due to excessive bending deformation of the structure. Therefore, the pipe and cable anti-bending device is of great significance in preventing the over-bending failure of the riser and dynamic cable, and improving the structural safety of the riser and dynamic cable.

[0003] The anti-bending device has the advantages of convenient installation and small space requirements, and is the most widely used anti-bending equipment for risers and dynamic cables. It increases the local stiffness of the riser and dynamic cable, so that when it is subjected to a bending load, it will not bend excessively. The advantage of this anti-bending principle is that it can effectively inhibit the fatigue damage of the riser and dynamic cable. Therefore, the anti-bending device is the most widely used. Almost every dynamically applied riser or dynamic cable needs to install an anti-bending device at its top to protect it from bending damage under the action of strong wind, wave and current and serve for a long time.

[0004] The structure of the anti-bending device is a conical member. Considering its wear resistance and anti-aging performance, polyurethane is selected as the material, and it is connected to the joint or floating body through the metal reinforcing members cured inside it. The metal reinforcing members include inserts such as bolts and flanges. The basic configuration of the outer circle of the anti-bending device consists of a short cylindrical part at the upper end, a conical part with a conical angle in the middle, and a cylindrical part at the free end. The diameter of the free end is slightly larger than that of the pipe and cable and the temporary fixing fixture. This part can also be absent according to requirements. The configuration of the inner circle is a circular through-hole, and metal reinforcing members are embedded inside the short cylindrical part at the upper end.

[0005] During the installation process, the position accuracy of the bolts in the metal reinforcing members determines the convenience of installation. Although the existing bolts have flange positioning, it is difficult to clamp and position during the welding process, resulting in inaccurate relative positions of the bolts after welding and difficult to ensure straightness. In addition, there will be a large tensile force in the part of the bolts inside the polyurethane casting, and the simple lap welding and fixing method is easy to be welded off. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to provide an ocean pipe and cable anti-bending device and an internal metal insert, which have high production quality, convenient assembly, and stable and reliable use.

[0007] To solve the above technical problems, the present utility model provides an internal metal insert, which includes a stirrup flange and a bottom plate arranged in parallel. The stirrup flange is evenly provided with first positioning and mounting holes, and the bottom plate is evenly provided with second positioning and mounting holes. The first positioning and mounting holes correspond to the second positioning and mounting holes one by one. A connecting rod is arranged between the first positioning and mounting holes and the second positioning and mounting holes. Positioning step grooves are provided on both the first positioning and mounting holes and the second positioning and mounting holes corresponding to the connecting rod. The end of the connecting rod extends into the positioning step groove, and a screw rod section is further provided at the end of the connecting rod. The screw rod section passes through the second positioning and mounting hole. The connecting rod and the first positioning and mounting hole are fixed by bolts. A reinforcing cylinder is provided in the middle of the bottom plate.

[0008] Further, the connecting rod and the corresponding positioning step groove are fixedly welded.

[0009] Further, the screw rod section and the second positioning and mounting hole are connected by threads.

[0010] Further, a countersunk head groove is further provided in the first positioning and mounting hole corresponding to the screw. The screw and the countersunk head groove are fixedly welded.

[0011] Further, a conical mesh cylinder is provided at the top of the stirrup flange. The conical mesh cylinder and the stirrup flange are fixedly welded.

[0012] Further, a plurality of positioning stirrups are arranged axially on the conical mesh cylinder, and a mounting groove is provided on the surface of the stirrup flange corresponding to the conical mesh cylinder.

[0013] Further, both the inner surface and the outer surface of the reinforcing cylinder are set as rough surfaces.

[0014] An offshore pipeline anti-bending device includes the internal metal insert as described in any one of the above and a polyurethane body. The internal metal insert is arranged inside one end of the polyurethane body and integrally cast.

[0015] The beneficial effects of the present utility model:

[0016] Positioning step grooves are provided on both the stirrup flange and the bottom plate. The cooperation of the two can make the straightness of the installation of the connecting rod and improve the quality of the product.

[0017] The upper end of the connecting rod is inserted into the stirrup flange. Compared with other direct contact welding structures, its tensile strength is higher. And the fixing structure at the upper end of the connecting rod increases the bolt cooperation, its tensile strength is higher, and the requirement for the weld strength is also reduced, improving the product quality.

[0018] The stirrup flange is a flat circular structure. During the stress-bearing process of the polyurethane, the stress is not easily concentrated at the stirrup flange, improving the strength of the anti-bending device. Brief Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the internal metal insert of the present utility model;

[0020] Figure 2 is the present utility model Figure 1 sectional structural schematic diagram;

[0021] Figure 3 is the structural schematic diagram of the connection between the connecting rod and the stirrup flange of the present utility model;

[0022] Figure 4 is the structural schematic diagram of the connection between the connecting rod and the bottom plate of the present utility model;

[0023] Figure 5 is the structural schematic diagram of the internal metal insert with a strengthened net cylinder of the present utility model;

[0024] Figure 6 is the structural schematic diagram of the anti-bending device of the present utility model;

[0025] Figure 7 is the sectional structural schematic diagram of the anti-bending device of the present utility model. Detailed Description of the Preferred Embodiments

[0026] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited are not intended to limit the present utility model.

[0027] Referring to Figures 1 to 4 shown, an embodiment of the internal metal insert of the present utility model includes a stirrup flange 1 and a bottom plate 2 arranged in parallel. The stirrup flange is evenly provided with first positioning and mounting holes 3, and the bottom plate is evenly provided with second positioning and mounting holes 4. The first positioning and mounting holes correspond to the second positioning and mounting holes one by one. A connecting rod 5 is arranged between the first positioning and mounting holes and the second positioning and mounting holes. Positioning step grooves 6 are provided on both the first positioning and mounting holes and the second positioning and mounting holes corresponding to the connecting rod. The end of the connecting rod extends into the positioning step groove, and a screw rod section 7 is further provided at the end of the connecting rod. The screw rod section passes through the second positioning and mounting hole. The connecting rod and the first positioning and mounting hole are fixed by a bolt 8. A strengthening cylinder 9 is arranged in the middle of the bottom plate. The inner diameter of the strengthening cylinder is slightly larger than the diameter of the inner circular through hole of the anti-bending device. The inside of the anti-bending device is entirely coated with polyurethane, avoiding wear caused by the vertical pipe and the dynamic cable contacting the metal parts.

[0028] The connecting rod is directly screwed into the second positioning and mounting hole of the bottom plate through its screw section, and the first positioning and fixing is achieved through the positioning step groove to ensure the perpendicularity between the connecting rod and the bottom plate. The other end of the connecting rod is also positioned with the stirrup flange through the positioning step groove and fixed by screw locking to form the second positioning and fixing. After being connected as a whole, the connecting rod, the stirrup flange and the bottom plate form an integral force, greatly improving the tensile strength and ensuring the straightness of the installation of the connecting rod, thus improving the quality of the product.

[0029] In the above fixing, the connecting rod is threadedly connected with the bottom plate, and the connecting rod and the stirrup flange are connected by screws. On this basis, strengthened welding fixation can also be carried out to improve the connection strength. Specifically, the connecting rod is welded and fixed with the corresponding positioning step groove, and a countersunk groove 10 is also provided in the first positioning and mounting hole corresponding to the screw, and the screw and the countersunk groove are welded and fixed. The countersunk groove can provide a better welding position with higher firmness. Compared with other direct contact welding structures, it has higher tensile strength, reduces the requirement for the weld strength, and improves the product quality. And the stirrup flange is of a flat-round structure. Compared with other round shapes, during the stress process of the polyurethane, the stress is not easily concentrated at the stirrup, improving the strength of the bender.

[0030] Both the inner surface and the outer surface of the strengthening cylinder are set as rough surfaces to improve the adhesion of the polyurethane material.

[0031] Refer to Figure 5 As shown, a conical mesh cylinder 11 is provided at the top of the stirrup flange, and the conical mesh cylinder is welded and fixed with the stirrup flange. The conical mesh cylinder can effectively play a strengthening role in the polyurethane body of the bender to form a skeleton structure. The top of the conical mesh cylinder cannot protrude from the polyurethane body to avoid cracking during use. The mesh holes of the conical mesh cylinder cannot be too dense. After the mesh holes are larger, the overall size and shape are not easily fixed. Therefore, during preparation, a number of positioning stirrups 12 can be axially arranged on the conical mesh cylinder. The positioning stirrups can play a strengthening role on the surface of the conical mesh cylinder, and the diameter of the positioning stirrups is determined, and its setting position can fix the diameter of the conical mesh cylinder, thereby ensuring the precise shape and size of the conical mesh cylinder to form a shaping effect and avoid position deviation during the pouring process.

[0032] To facilitate the installation of the conical mesh cylinder, an installation groove can also be provided on the surface of the stirrup flange corresponding to the conical mesh cylinder. The installation groove can be an annular groove. The shaped conical mesh cylinder can be directly placed in the installation groove and then welded and fixed, which is convenient to operate and has accurate position.

[0033] Refer to Figure 6 and Figure 7As shown in the figure, the present application also discloses an offshore pipeline anti-bending device, which includes the above-mentioned internal metal insert 111 and polyurethane body 112. The internal metal insert is arranged inside one end of the polyurethane body and integrally cast.

[0034] For the anti-bending device with the above structure, its preparation method is as follows:

[0035] First, insert one end of the reinforcing cylinder into the inner hole of the bottom plate, and fix it by circumferential fillet welding on both sides. After welding, grind the protruding part of the bottom weld, and detect the weld for defects.

[0036] Subsequently, screw the screw end of the connecting rod into the threaded hole of the second positioning and mounting hole on the bottom plate until the cylindrical end face of the connecting rod is completely inserted into the positioning step groove of the second positioning and mounting hole, and screw in all the connecting rods in sequence; align the positioning step groove on the stirrup flange with the end of the connecting rod for assembly, insert the end of the connecting rod into the positioning step groove of the first positioning and mounting hole, and screw in bolts from the upper end to fix them all in sequence; during welding, first fix the contact part between the connecting rod and the stirrup flange by intermittent welding, and then fix the contact part between the connecting rod and the bottom plate by circumferential welding; then fix the bolt head and the stirrup flange by spot welding, grind the protruding part of the weld, and detect the weld for defects. After the weld inspection is qualified, the processing of the embedded metal insert is completed.

[0037] Put the metal insert into the corresponding anti-bending device casting mold, and the processing is completed after pouring polyurethane.

[0038] Among them, when a conical mesh cylinder is provided, the conical mesh cylinder can be welded to the stirrup flange to form an embedded metal insert. The optimized structure of the internal metal insert of the anti-bending device is convenient for production and improves the product strength.

[0039] Based on the above product, an integrated screw structure is adopted. One end is screwed into the corresponding threaded hole of the bottom plate through external threads and then welded and fixed. Compared with other through-hole insertion structures or split structures, its tensile strength is higher; the positioning step groove provided on the bottom plate cooperates with the outer circle of the connecting rod to ensure the straightness of the connecting rod installation and improve the product quality; counterbore holes are provided at both the upper and lower ends of the stirrup flange to further ensure the straightness of the connecting rod installation and improve the product quality; the structure in which the upper end of the connecting rod is inserted into the stirrup flange has a higher tensile strength compared with other direct contact welding structures.

[0040] And the fixing structure of the upper end of the connecting rod adds bolt fixing. Compared with other direct contact welding structures, its tensile strength is higher, reducing the requirement for the weld strength and improving the product quality.

[0041] The inner diameter of the above-mentioned reinforced cylinder is slightly larger than the inner circular through-hole diameter of the anti-bending device. The inside of the anti-bending device is entirely coated with polyurethane, avoiding wear caused by the contact between the riser and the dynamic cable and metal parts.

[0042] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are within the protection scope of the present invention.

Claims

1. An internal metal insert, characterized in that, It includes a stirrup flange and a bottom plate arranged in parallel. The stirrup flange is evenly provided with first positioning and mounting holes, and the bottom plate is evenly provided with second positioning and mounting holes. The first positioning and mounting holes correspond to the second positioning and mounting holes one by one. A connecting rod is arranged between the first positioning and mounting holes and the second positioning and mounting holes. Positioning step grooves are provided on both the first positioning and mounting holes and the second positioning and mounting holes corresponding to the connecting rod. The end of the connecting rod extends into the positioning step groove. A screw rod section is also provided at the end of the connecting rod. The screw rod section passes through the second positioning and mounting hole. The connecting rod is fixed to the first positioning and mounting hole by a bolt. A reinforcing cylinder is arranged in the middle of the bottom plate.

2. The internal metal insert according to claim 1, characterized in that, The connecting rod is fixedly welded to the corresponding positioning step groove.

3. The internal metal insert according to claim 1, wherein The screw rod section is threadedly connected to the second positioning and mounting hole.

4. The internal metal insert according to claim 1, characterized in that, A countersunk head groove is also provided in the first positioning and mounting hole corresponding to the bolt. The bolt is fixedly welded to the countersunk head groove.

5. The internal metal insert according to claim 1, characterized in that, A conical mesh cylinder is arranged at the top of the stirrup flange. The conical mesh cylinder is fixedly welded to the stirrup flange.

6. The internal metal insert according to claim 5, characterized in that, A number of positioning stirrups are arranged axially on the conical mesh cylinder. An installation groove is provided on the surface of the stirrup flange corresponding to the conical mesh cylinder.

7. The internal metal insert according to claim 1, characterized in that, Both the inner surface and the outer surface of the reinforcing cylinder are set as rough surfaces.

8. An anti-bending device for marine pipelines, characterized in that, It includes the internal metal insert and the polyurethane body according to any one of claims 1-7. The internal metal insert is arranged inside one end of the polyurethane body and integrally cast.

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