Support frame for construction of underneath passing of submarine cable through submarine oil and gas pipeline

Abstract

The utility model discloses a support frame for construction of underneath passing of submarine cables through submarine oil and gas pipelines, a pipe hanger assembly is installed in the middle of the interior of a support door frame, anti-sinking bottom plates are installed at four corners of the bottom of the support door frame, and side arc-shaped brackets are arranged on the support door frame along the direction of newly laid cables. According to the utility model, the portal frame spans the existing oil and gas pipeline, the supporting frame is connected with the oil and gas pipeline through the pipe hanging bracket to support a local pipeline, and then a constructed cable is pulled into the pipeline from the arc-shaped bracket on the side surface, penetrates through the oil and gas pipeline downwards and comes out from the other side, so that the crossed part of the cable and the oil and gas pipeline has a safe spacing distance in space; and the safety and the stability are improved. Through the supporting frame, underwater dredging and desilting work can be greatly reduced, a cable is controlled not to turn when being inserted, the cable is not close to an oil and gas pipeline in the long-term operation process, and the oil and gas pipeline is not locally sunken to extrude the cable; the whole supporting frame is stable in structure, convenient and rapid to construct and good in practical value.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering construction, in particular to a support frame for the construction of a submarine cable passing through a submarine oil and gas pipeline. Background Art

[0002] In offshore oil development projects, it is necessary to build various platforms such as oil production platforms, living platforms, and central processing platforms at sea. In order to cooperate with the offshore oil production platforms in oil production operations, many pipe and cable facilities such as submarine cables and submarine oil pipelines are laid around the offshore oil production platforms to connect each other and the land refinery or centralized control center. Therefore, there are many facilities and complex terrain around each offshore oil production platform. In addition, with the rapid development of offshore wind power, each wind farm area is densely covered with a large number of submarine cables, and at the same time, the ocean connects the high-voltage cables of the land centralized control center.

[0003] Multiple wind farms and oil and gas facilities will make some areas connected to the land with a lot of pipes and cables. If submarine cable construction is carried out in such an area, it is generally not allowed to cross over the oil and gas pipelines. This requires the cable construction to pass under the oil and gas pipelines. If the cable is cut and passed through first, and then the joints are made, this will increase the construction time, and a sufficiently long weather window is required for the joint construction. The more submarine cable joints there are, the greater the transmission loss will be. At the same time, there is also a high risk of partial joint breakdown. The construction work from the bottom also needs to ensure that the cable is not damaged by bending, which makes the on-site excavation workload large and the construction in shallow and turbid areas is extremely difficult. How to reduce the number of cable joints to pass the submarine cable from under the oil and gas pipeline and keep a certain safety distance from the existing pipeline is a difficult problem in submarine cable construction.

[0004] In order to solve the above problems, we proposed a support frame for the construction of submarine cables crossing submarine oil and gas pipelines. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a support frame for the construction of a submarine cable passing through a submarine oil and gas pipeline. The utility model provides the following technical solutions:

[0006] A support frame for the construction of a submarine cable crossing a submarine oil and gas pipeline comprises a support gantry, a pipe hanger assembly is installed in the middle of the support gantry, anti-sinking bottom plates are installed at the four corners of the bottom of the support gantry, and side arc brackets are arranged on the support gantry along the direction of newly laid cables.

[0007] Preferably, the supporting portal frame is composed of a main frame, transverse reinforcing diagonal braces and longitudinal reinforcing diagonal braces. The four end corners of the top of the main frame are respectively provided with lifting ears. A pipe hanger mounting seat that meets the installation requirements of the pipe hanger assembly is provided in the middle of the lower cross beam of the main frame. Transverse reinforcing diagonal braces and longitudinal reinforcing diagonal braces are welded between the main frame and the anti-sinking bottom plate.

[0008] Preferably, the pipe hanger assembly is a metal piece with threaded rods at both ends and a U-shaped bracket in the middle, and one set of the pipe hanger assembly is arranged along the front and back of the existing oil and gas pipeline.

[0009] Preferably, the side arc bracket is composed of an arc support plate and an oblique support frame, the arc support plate is formed by bending steel plates with opposite side arcs arranged upward, and the arc support plate is connected to the supporting portal through the oblique support frame.

[0010] Preferably, the arc-shaped support plate is provided with densely distributed holes.

[0011] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0012] This patent uses a steel structure portal frame support frame to cross the existing oil and gas pipeline, and uses a pipe hanger to connect the support frame to the oil and gas pipeline to support the local pipeline. The cable to be constructed is then pulled in from the arc-shaped bracket on the side, passes under the oil and gas pipeline and comes out from the other side, so that the intersection of the cable and the oil and gas pipeline has a safe spatial spacing distance, thereby improving safety and stability; the support frame can greatly reduce underwater dredging and silt removal operations, control the cable to avoid bending when it is inserted, and will not approach the oil and gas pipeline during long-term operation, and the oil and gas pipeline will not sink locally to squeeze the cable; the support frame of this patent has a stable structure, convenient and fast construction, and has good practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used to illustrate the purpose of the preferred embodiment and are not considered to be limitations of the present invention. In the entire drawings, the same reference numerals are used to represent the same parts.

[0014] In the attached picture:

[0015] Figure 1 It is a schematic diagram of the overall structure of the support frame of the preferred embodiment of the utility model;

[0016] Figure 2 It is a partial schematic diagram of the pipe and cable crossing components of the preferred embodiment of the utility model;

[0017] Figure 3 It is a schematic diagram of pre-excavation for construction of a preferred embodiment of the utility model;

[0018] Figure 4 This is a schematic diagram of the installation of the support frame of the preferred embodiment of the utility model;

[0019] Figure 5 It is a schematic diagram of the completion of construction of the preferred embodiment of the utility model.

[0020] in, Figures 1 to 5 The corresponding relationship between the reference numerals and the components is as follows:

[0021] 1. Existing oil and gas pipelines; 2. Newly laid cables; 3. Support frame device; 31. Support gantry; 311. Lifting lugs; 312. Main frame; 313. Horizontal reinforcing braces; 314. Longitudinal reinforcing braces; 315. Pipe hanger mounting base; 32. Pipe hanger assembly; 33. Anti-sinking bottom plate; 34. Side arc bracket; 341. Arc bracket; 342. Oblique support frame; 4. Seabed. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] Combine the following Figures 1 to 5 A support frame for the construction of a submarine cable passing through a submarine oil and gas pipeline according to an embodiment of the utility model is specifically described.

[0025] A support frame for the construction of submarine cables crossing submarine oil and gas pipelines is a door-shaped frame structure with side arc brackets, which straddles the existing oil and gas pipeline 1 and is connected to the existing oil and gas pipeline 1, so that it is in a relatively fixed position. There are arc brackets on both sides perpendicular to the existing oil and gas pipeline 1 to facilitate the subsequent laying of new cables 2 through the lower part of the existing oil and gas pipeline 1. The size control of the structural parts meets the safety requirements of the distance between the center of the newly laid cable 2 and the existing oil and gas pipeline 1, and there will be no external contact. Figure 1~2As shown, its components include: a supporting door frame 31, a pipe hanger assembly 32, an anti-sinking bottom plate 33, and a side arc bracket 34.

[0026] The support gantry 31 is the main structure of the support frame device 3. It is welded into a door-shaped structural member using steel pipes or H-shaped steel, etc., to meet the installation of the pipe hanger assembly 32 in the middle and lower part, the connection support of the anti-sinking bottom plate 33 at the bottom, and the connection and installation of the arc brackets 34 on both sides. The overall gantry is welded to form a strong structural frame, with a lifting lug 311 cut from a steel plate on the upper part, and one lug is arranged on each corner to achieve 4-point horizontal hanging. The main frame 312 of the main body is a door-shaped frame, with two layers of horizontal beams and longitudinal bars arranged on the upper part to form a frame structure, and a pipe hanger mounting seat 315 in the middle of the lower horizontal beam that meets the installation and connection of the pipe hanger assembly 32. The vertical rod at the bottom of the gantry determines the final height according to the geology of the installation area, the construction interval requirements, and the pre-excavation depth requirements to meet the installation requirements. The lower part of the support gantry 31 is welded and connected to the anti-sinking bottom plate 33, and is arranged with a horizontal reinforcement brace 313 and a longitudinal reinforcement brace 314, all of which are welded with steel sections, making the connection between the two more stable and reliable. The pipe hanger mounting seat 315 is made by cutting and manufacturing steel plates and welded in the middle of the lower crossbeam of the main frame 312. Holes are opened corresponding to the screw spacing and diameter of the pipe hanger assembly 32 to allow the pipe hanger assembly 32 to pass through the rear nut for installation and tightening, thereby fixing the existing oil and gas pipeline 1 to the lower part of the support gantry 31. In order to ensure the stability of the structure, necessary reinforcing ribs are also provided to ensure reliable and stable load transmission. The main frame 312 also has a longitudinal cross bar at the root of the arc support plate 341 of the side arc support 34. The vertical spacing between the cross bar and the lower cross beam welded by the pipe hanger mounting seat 315 is adjusted, so that the existing oil and gas pipeline 1 and the newly laid cable 2 have a safe spatial spacing at the intersection of the support frame device 3, while also ensuring that the arc support plate 341 is welded reliably and improving stability.

[0027] The pipe hanger assembly 32 is installed in the middle of the support gantry 31, arranged along the direction of the existing oil and gas pipeline 1, and arranged in front and back. It is a metal part with threaded rods at both ends and a U-shaped support in the middle. The lower part of the existing oil and gas pipeline 1 is supported by the U-shaped support, and the upper end is connected with the pipe hanger mounting seat 315 of the support gantry 31 by nuts, and the existing oil and gas pipeline 1 is fixed in the fixed position of the support gantry 31. Through the adjustment of the nut, the existing oil and gas pipeline 1 can be well applied with a fixing force. In order to reduce the damage to the existing oil and gas pipeline 1, the U-shaped support and the contact position of the pipeline can be wrapped with a polyurethane pad. At the same time, a V-shaped frame is set at the bottom of the pipe hanger mounting seat 315, so that the existing oil and gas pipeline 1 is firmly fixed. According to the size of the existing oil and gas pipeline 1, the screw diameter of the pipe hanger assembly 32, the width and thickness of the U-shaped support steel plate are correspondingly enhanced. Further, in order to improve the connection reliability, more pipe hanger assemblies 32 can be arranged, and the corresponding pipe hanger mounting seat 315 is also increased to meet the installation needs.

[0028] The anti-sinking bottom plate 33 is welded or bolted to the four corners of the bottom of the support gantry 31, with intervals between them to meet the needs of offshore lifting construction, and will not bump into and damage the existing oil and gas pipeline 1 when installed on it. According to the different geology of the construction area, the area of ​​the bottom plate is adjusted differently to prevent the support frame device 3 from sinking too much after installation, causing excessive external force to the existing oil and gas pipeline 1, affecting the safe operation of the existing oil and gas pipeline 1. At the same time, the anti-sinking bottom plate 33 is also welded to the bottom of the transverse reinforcement brace 313 and the longitudinal reinforcement brace 314 of the support gantry 31, making the connection between the two more stable and reliable. According to different characteristics and installation requirements, the anti-sinking bottom plate 33 can adopt a structure with buoyancy or negative pressure barrel, or a long pile to support its upper load without causing additional downward pressure on the connected existing oil and gas pipeline 1.

[0029] The side arc bracket 34 is arranged on the support frame device 3 along the direction of the newly laid cable 2. It is an arc support plate 341 with an upward arc arranged on the opposite side. It is made of a steel plate of a certain thickness and the bending radius is set according to the allowable radius for the construction of the newly laid cable 2. In order to reduce weight and avoid being affected by water flow in the water, the support plate is provided with densely distributed small-diameter holes, which will not affect the sliding passage of the newly laid cable 2 and can also reduce weight well. The extended arc support plate 341 is connected to the support portal 31 through multiple 3.4.2- inclined support frames arranged radially, so that the structure is stable and can withstand the pulling force of the cable when the newly laid cable 2 is passed through, and the structure will not be deformed and unstable. According to different construction needs, when the water depth exceeds 10m, it is necessary to install necessary rollers on the contact part between the arc support plate 341 and the newly laid cable 2 to reduce the sliding friction resistance of the newly laid cable 2 and facilitate the completion of the crossing construction.

[0030] The specific installation steps are:

[0031] Step 1: Determine the main dimensions of the support gantry 31 and the detailed specifications of the pipe hanger assembly 32 based on the specifications and dimensions of the existing oil and gas pipeline 1 and the required spacing with the newly laid cable 2. Determine the size of the side arc bracket 34 of the support frame device 3 based on the outer diameter and bending radius of the newly laid cable 2 and the corresponding performance characteristics of the construction ship and machinery. Determine the size and form of the anti-sinking bottom plate 33 based on the geological conditions of the construction site. Finally, complete the detailed design and manufacturing of the support frame device 3.

[0032] Step 2: Transport the manufactured support frame device 3 to the engineering ship, and position the ship at the set crossing intersection. Anchoring is preferred, but dynamic positioning can also be used. After stabilizing at the crossing point of the existing oil and gas pipeline 1, divers carry mud flushing equipment into the water to clear the mud in the area of ​​the existing oil and gas pipeline 1 at the crossing point, forming a pit with a slope and a certain width at the bottom. Clean the exposed existing oil and gas pipeline 1 in the middle of the pit, remove marine organisms or obstacles from the outside of the pipeline, and install the support frame device 3 after checking that the pipeline is not damaged. Figure 3 As shown; if there is only one crossing point, the support frame device 3 can be installed by the crane of the cable-laying ship after the cable-laying ship arrives at the crossing position. If the route has multiple crossing points, it is recommended to use a separate ship to centrally install the support frame device 3 to facilitate subsequent cable-laying operations.

[0033] Step 3: Hang the lock on the lifting ear 311, fasten the diagonal cable wind rope, lift the support frame device 3 as a whole and lower it into the water by the crane, and lower it to the bottom of the anti-sinking bottom plate 33 when it is stable and close to the upper part of the existing oil and gas pipeline 1. The diver checks the position underwater so that the gantry straddles the existing oil and gas pipeline 1. At the same time, the pipe hanger mounting seat 315 is positioned along the route of the existing oil and gas pipeline 1. The cable wind rope is adjusted and slowly lowered. The diver assists in making the support frame device 3 straddle the anti-sinking bottom plate 33 on the existing oil and gas pipeline 1 and stably contact the bottom of the pit. Adjust the support gantry 31 so that it is close to the center. Insert the U-shaped metal frame of the pipe hanger assembly 32 upward from the bottom of the existing oil and gas pipeline 1 to the pipe hanger mounting seat 315, put on the nut, and adjust and install the two sets of pipe hanger assemblies 32 before and after. Tighten the nut after it is basically aligned to complete the connection between the support frame device 3 and the existing oil and gas pipeline 1, such as Figure 4 As shown; the diver checks the contact condition of the anti-sinking bottom plate 33. If there is local overhang, sandbags can be used to level it to ensure that the four corners of the anti-sinking bottom plate 33 are stably supported and no additional downward pressure is generated on the existing oil and gas pipeline 1. Then continue to press sandbags of a certain weight in the area of ​​the anti-sinking bottom plate 33 to ensure that the support frame device 3 will not be lifted when the newly laid cable 2 passes through and is pulled. Then, a thin steel wire rope is pre-threaded through the side arc bracket 34 on one side through the lower part of the existing oil and gas pipeline 1 to the side arc bracket 34 on the other side, and underwater markings are made at both ends of the steel wire rope. The rope is temporarily tied to the support door frame 31, and the lock on the lifting ear 311 is unlocked to complete the installation of the support frame device 3.

[0034] Step 4: The cable-laying vessel is laid to the crossing point, and the stored newly laid cable 2 is released into the water or onto the deck, and is laid in an "8"-shaped coil until it comes out of the cable head; then the traction winch wire rope is lowered into the water, and the reserved wire rope end on the entry side of the water is connected; the deck auxiliary winch lowers the traction wire rope into the water, and connects the reserved wire rope end on the exit side. Recover the auxiliary winch wire rope and release the traction winch wire rope synchronously, so that the traction winch wire rope passes through the support frame device 3 to the cable-laying ship and is connected to the cable head pulling point of the newly laid cable 2; start the traction winch to pass the cable head of the newly laid cable 2 from the support frame device 3 into the side arc bracket 34 and pass it out to the other side, so as to achieve the lowering and passing through of the existing oil and gas pipeline 1; then control the traction wire rope or the angle of the newly laid cable 2 coming out of the side arc bracket 34 on both sides, so that the support frame device 3 is subjected to a small upward lifting force when passing through the pulling point and the newly laid cable 2 does not have obvious bending, and gradually pull until the newly laid cable 2 is completely passed out and recovered to the cable-laying ship, completing the construction of the newly laid cable 2 passing under the existing oil and gas pipeline 1. Figure 5 shown.

[0035] Step 5: Fill the suspended part of the existing oil and gas pipeline 1 at the position of the support frame device 3 with underwater sandbags, and dig trenches to bury the newly laid cable 2 to a certain depth, backfill the previously excavated pit, and complete the crossing point construction. After that, the cable-laying ship continues to lay the newly laid cable 2 until it is finally completed.

[0036] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A support frame for the construction of a submarine cable passing through a submarine oil and gas pipeline, comprising a support gantry (31), characterized in that: A pipe hanger assembly (32) is installed in the middle of the support portal (31), anti-sinking bottom plates (33) are installed at the four corners of the bottom of the support portal (31), and a side arc bracket (34) is arranged on the support portal (31) along the direction of the newly laid cable (2).

2. A support frame for the construction of a submarine cable passing through a submarine oil and gas pipeline according to claim 1, characterized in that: The support door frame (31) is composed of a main frame (312), a transverse reinforcing brace (313) and a longitudinal reinforcing brace (314); four end corners of the top of the main frame (312) are respectively provided with lifting ears (311); a pipe hanger mounting seat (315) for installing the pipe hanger assembly (32) is provided in the middle of the lower cross beam of the main frame (312); and a transverse reinforcing brace (313) and a longitudinal reinforcing brace (314) are welded between the main frame (312) and the anti-sinking bottom plate (33).

3. The support frame for the construction of a submarine cable passing through a submarine oil and gas pipeline according to claim 1 is characterized in that: The pipe hanger assembly (32) is a metal piece with threaded rods at both ends and a U-shaped bracket in the middle. One set of the pipe hanger assembly (32) is arranged along the front and rear of the existing oil and gas pipeline (1).

4. A support frame for the construction of a submarine cable passing through a submarine oil and gas pipeline according to claim 1, characterized in that: The side arc-shaped bracket (34) is composed of an arc-shaped support plate (341) and an oblique support frame (342); the arc-shaped support plate (341) is formed by bending a steel plate with an arc-shaped opposite side facing upward; the arc-shaped support plate (341) is connected to the support door frame (31) via the oblique support frame (342).

5. A support frame for the construction of a submarine cable passing through a submarine oil and gas pipeline according to claim 4, characterized in that: The arc-shaped supporting plate (341) is provided with densely distributed holes.

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