Hoisting clamp for replacing offshore platform riser

Abstract

The utility model discloses a hoisting fixture for replacing an offshore platform riser, which comprises a blind flange, a lifting lug is arranged on the upper surface of the blind flange and connected with a steel wire rope through a hoisting shackle, a connecting device is arranged at the edge of the blind flange, and the connecting device is sequentially connected with the blind flange, a building block and a bottom plate flange from top to bottom. The bottom plate flange is arranged at the bottom of the vertical pipe. The device is simple in structure and convenient to operate, the form of the flange and the lifting lug is adopted, the lifting lug is connected with the lifting steel wire rope through the shackle, the flange face is attached to the flange face of the stand pipe, bolt connection is adopted, and mounting and dismounting are convenient. The utility model has strong practicability for the replacement and reinstallation of the stand pipe in the future, and can be repeatedly used for the replacement of such equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore oil platform maintenance, in particular to a hoisting fixture used for replacing offshore platform risers. Background Art

[0002] During their operational life, offshore platforms often require modifications to their production facilities. One such modification involves replacing or adding new crude oil risers. These new risers are prefabricated onshore and transported to the platform by transport vessel for installation. The risers are then hoisted into their installation locations and secured. Since the risers consist of two sections, one abovewater and one underwater, they are installed vertically downward, close to the jacket. The risers are connected at both ends by flanges, without any intermediate lifting devices.

[0003] The current hoisting method often involves tying the upper ends of risers with slings. However, because a single riser is approximately 25 meters long and weighs 4 to 6 tons, and needs to be installed below the water surface, it is subject to the impact of currents and swaying on the seabed. Therefore, this tying method carries the risk of falling off and is unsafe. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a lifting fixture for replacing risers on offshore platforms, which has a simple structure, is easy to operate, is convenient to install and disassemble, can be repeatedly used for the installation and disassembly of each section of riser, and is highly practical.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a lifting fixture for replacing offshore platform risers, comprising a blind flange, a lifting lug is provided on the upper surface of the blind flange, the lifting lug is connected to the wire rope through a lifting shackle, a connecting device is provided at the edge of the blind flange, the connecting device connects the blind flange, the building block and the base plate flange in sequence from top to bottom, the building block is placed on the side of the riser flange, and the base plate flange is placed at the bottom of the riser flange.

[0006] Furthermore, the blind flange is a circular plate, the connecting device is a bolt and a nut, and a plurality of first connecting holes are distributed circumferentially on the edge of the blind flange, and the bolts are placed in the connecting holes.

[0007] Furthermore, the lifting lug includes a lifting lug plate, which is a triangular plate. The bottom edge of the lifting lug plate is placed on a diameter of the blind flange, and a lifting hole is provided at the top corner of the lifting lug plate.

[0008] Furthermore, a circular hole reinforcement plate is provided at the hanging hole, and the circular hole reinforcement plate includes two pieces, and the two circular hole reinforcement plates are respectively placed on the two surfaces of the hanging ear plate.

[0009] Furthermore, two surfaces at one-third and two-thirds of the lug plate are respectively connected to the lug support plates, and the four lug support plates are respectively arranged perpendicular to the lug plates.

[0010] Furthermore, the building blocks are arc-shaped plates, and three of the building blocks form a circular ring.

[0011] Furthermore, the building block is provided with a second connecting hole, the second connecting hole corresponds to the first connecting hole, and the bolt passes through the second connecting hole.

[0012] Furthermore, the bottom plate flange is an arc-shaped plate, and the two bottom plate flanges form a circular ring.

[0013] Furthermore, a third connecting hole is provided on the base plate flange, the third connecting hole corresponds to the first connecting hole, and the bolt passes through the third connecting hole.

[0014] Furthermore, a rubber gasket is provided between the bottom surface of the blind flange and the top surface of the riser.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. During the vertical pipe hoisting process, the vertical pipe can be hoisted stably by the hoisting clamp of the present invention without the risk of falling off. The present invention adopts bolts for installation and connection, which has the advantages of easy installation, detachability, reliable structure, low construction difficulty, high efficiency and low cost.

[0017] 2. This new model has a simple structure and is easy to operate. It adopts a flange plus lug structure. The lug is connected to the lifting wire rope through a shackle. The flange surface fits the flange surface of the riser and is bolted, making it easy to install and remove. This new model is very practical for future riser replacement and reinstallation and can be used repeatedly for replacement of such equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0019] Figure 2 It is an exploded view of the overall structure of an embodiment of the utility model.

[0020] Figure 3 It is a front view of the overall structure of an embodiment of the utility model.

[0021] Figure 4 It is a top view of the blind flange structure of an embodiment of the present utility model.

[0022] Figure 5 It is a top view of the building block structure of an embodiment of the present utility model.

[0023] Figure 6 It is a top view of the bottom plate flange structure of an embodiment of the present utility model.

[0024] In the picture:

[0025] 1. Lifting ear plate; 2. Round hole reinforcement plate; 3. Blind flange;

[0026] 4. Masonry blocks; 5. Bottom plate flange; 6. Rubber gasket;

[0027] 7. Bolts; 8. Lifting lug support plate; 9. Riser flange. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings:

[0032] like Figure 1-3As shown, a lifting fixture for replacing offshore platform risers includes a blind flange 3. A lifting lug is provided on the upper surface of the blind flange 3. The lifting lug is connected to a wire rope via a lifting shackle. A connecting device is provided at the edge of the blind flange 3. The connecting device connects the blind flange 3, a building block 4 and a base plate flange 5 in sequence from top to bottom. The building block 4 is placed on the side of the riser flange 9, and the base plate flange 5 is placed at the bottom of the riser flange 9.

[0033] Specifically, such as Figure 4 As shown, the blind flange 3 provided in this embodiment is a circular plate, the connecting device is a bolt 7 and a nut, and a plurality of first connecting holes are distributed circumferentially on the edge of the blind flange 3, and the bolts 7 are placed in the connecting holes.

[0034] like Figure 5 As shown, block 4 is located below blind flange 3 and outside riser flange 9. Block 4 is an arc-shaped plate, and three blocks 4 form a circular ring. Block 4 is used to limit the riser flange 9 to prevent it from swinging and causing damage during lifting. Block 4 has a second connecting hole, which corresponds to the first connecting hole. Bolt 7 passes through the first connecting hole and then into the second connecting hole.

[0035] like Figure 6 As shown, the bottom flange 5 is located below the building block 4 and the riser flange 9. The bottom flange 5 is an arc-shaped plate, and the two bottom flanges 5 form a circular ring. The bottom flange 5 is provided with a third connection hole, which corresponds to the first connection hole. The bolt 7 passes through the first connection hole, the second connection hole, and the third connection hole from top to bottom, and is then fixed with a nut. By tightening the bolt 7, the riser flange 9 is tightened to support the entire weight of the riser. Preferably, as Figure 3 As shown, a rubber gasket 6 is provided between the bottom surface of the blind flange 3 and the top surface of the riser, effectively preventing damage to the riser flange 9. Bolts 7 and nuts connect the blind flange 3, rubber gasket 6, building blocks 4, and base flange 5, securing the rubber gasket 6 to the top surface of the riser flange 9, the building blocks 4 to the outside of the riser flange 9, and the base flange 5 to the underside of the riser flange 9. Preferably, this embodiment provides twelve first, second, and third connection holes.

[0036] like Figure 3 As shown, the lifting lug includes a lifting lug plate 1, which is a triangular plate. The bottom edge of the lifting lug plate 1 is placed on a diameter of the blind flange 3. A lifting hole is provided at the top corner of the lifting lug plate 1, and a lifting wire rope is connected via a lifting shackle. Preferably, a circular hole reinforcement plate 2 is provided at the lifting hole. The circular hole reinforcement plate 2 includes two pieces. The two circular hole reinforcement plates 2 are respectively placed on the two surfaces of the lifting lug plate 1 to enhance the connection strength between the two and prevent damage to the shackle during the lifting process. Specifically, the device is connected to the wire rope via the lifting shackle.

[0037] like Figure 4As shown, the two surfaces of the lug plate 1 are connected to the lug support plates 8 at one-third and two-thirds respectively. The four lug support plates 8 are arranged perpendicular to the lug plate 1. The lug support plates 8 are used to enhance the connection strength between the two to prevent lateral pull damage caused by changes in the direction of the wire rope. There is no supporting structure in the middle of the blind flange 3 to enhance the strength of the blind flange 3.

[0038] The advantages and positive effects of the utility model are:

[0039] 1. During the vertical pipe hoisting process, the vertical pipe can be hoisted stably by the hoisting clamp of the present invention without the risk of falling off. The present invention adopts bolts for installation and connection, which has the advantages of easy installation, detachability, reliable structure, low construction difficulty, high efficiency and low cost.

[0040] 2. This new model has a simple structure and is easy to operate. It adopts a flange plus lug structure. The lug is connected to the lifting wire rope through a shackle. The flange surface fits the flange surface of the riser and is bolted, making it easy to install and remove. This new model is very practical for future riser replacement and reinstallation and can be used repeatedly for replacement of such equipment.

[0041] The above embodiments of the present invention are described in detail. However, the above contents are only preferred embodiments of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A lifting fixture for replacing risers on offshore platforms, characterized by: It includes a blind flange, the upper surface of which is provided with a lifting lug, the lifting lug is connected to the wire rope through a lifting shackle, a connecting device is provided at the edge of the blind flange, the connecting device connects the blind flange, the building block and the base plate flange in sequence from top to bottom, the building block is placed on the side of the riser flange, and the base plate flange is placed at the bottom of the riser flange.

2. The lifting fixture for replacing an offshore platform riser according to claim 1, characterized in that: The blind flange is a circular plate, the connecting device is a bolt and a nut, and a plurality of first connecting holes are distributed circumferentially on the edge of the blind flange, and the bolts are placed in the connecting holes.

3. A lifting fixture for replacing an offshore platform riser according to claim 1 or 2, characterized in that: The lifting lug includes a lifting lug plate, which is a triangular plate. The bottom edge of the lifting lug plate is placed on a diameter of the blind flange, and a lifting hole is provided at the top corner of the lifting lug plate.

4. The lifting fixture for replacing an offshore platform riser according to claim 3, characterized in that: A circular hole reinforcement plate is provided at the hanging hole, and the circular hole reinforcement plate includes two pieces, and the two circular hole reinforcement plates are respectively placed on the two surfaces of the hanging ear plate.

5. The lifting fixture for replacing an offshore platform riser according to claim 3, characterized in that: Two surfaces at one-third and two-thirds of the lug plate are respectively connected to the lug support plates, and the four lug support plates are respectively arranged perpendicular to the lug plates.

6. The lifting fixture for replacing an offshore platform riser according to claim 2, characterized in that: The building blocks are arc-shaped plates, and three of the building blocks form a circular ring.

7. The lifting fixture for replacing an offshore platform riser according to claim 6, characterized in that: The building block is provided with a second connecting hole, the second connecting hole corresponds to the first connecting hole, and the bolt passes through the second connecting hole.

8. The lifting fixture for replacing an offshore platform riser according to claim 2, characterized in that: The bottom plate flange is an arc-shaped plate, and two bottom plate flanges form a circular ring.

9. The lifting fixture for replacing an offshore platform riser according to claim 8, characterized in that: A third connecting hole is provided on the bottom plate flange, the third connecting hole corresponds to the first connecting hole, and the bolt passes through the third connecting hole.

10. A lifting fixture for replacing an offshore platform riser according to claim 1 or 2, characterized in that: A rubber gasket is provided between the bottom surface of the blind flange and the top surface of the riser.

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