Three-dimensional configuration steel jumper pipe installation method

Abstract

The invention discloses a three-dimensional configuration steel jumper pipe installation method which comprises the following steps that a jumper pipe barge leans against a wharf, and a floating crane ship is parked on a hoisting truss and a jumper pipe at the front edge of the wharf; the floating crane ship is made to directly face the barge, and a crane on the floating crane ship is lowered down so that the jumper pipe can be located on the jumper pipe supporting structure; descending is continued, the hoisting truss is located on the supporting structure, and the rigging between the hoisting truss and the jumper pipe body is removed; the hoisting truss is hoisted and placed on a barge deck, and then the barge arrives at an installation site; the barge leans against the main workboat, and the main workboat lifts the hoisting truss on the deck of the barge to be located on the supporting structure; a rigging is connected between the hoisting truss and the jumper pipe body; and the main workboat lifts the lifting truss again, the rigging is straightened, lifting continues, the jumper pipe leaves the supporting structure, and offshore lifting is completed. According to the installation method, the installation safety and the operation efficiency are improved at the same time, and the problems that a hoisting structure is large in self-weight load and large in occupied space are solved.

Description

Technical Field

[0001] The present invention belongs to the field of oil and gas development, and particularly relates to a method for installing a three-dimensional steel cross-connecting pipe. Background Art

[0002] As an important part of the underwater production system, steel cross-connecting pipes are divided into vertical connector type cross-connecting pipes and horizontal connector type cross-connecting pipes according to the form of the connectors at both ends. Among them, the horizontal connector type cross-connecting pipes are often in a three-dimensional spatial configuration due to the relative positions, orientations of the underwater production facilities at both ends to be docked, and the in-situ stress during oil and gas production, etc., and are widely used internationally.

[0003] At present, for the installation of flat-configured cross-connecting pipes, on the one hand, the cross-connecting pipe structure is in the same plane, and on the other hand, the structure used for hoisting is a single rod shape (a strut, with a simple structure). When loading onto a ship on land, after directly hoisting the whole, the strut and the cross-connecting pipe are respectively placed in the corresponding limiting structures, and then it can be directly transported to the sea for overall hoisting into the water. However, for large-sized three-dimensional spatial configured cross-connecting pipes (for example, the cross-connecting pipe in a deep-water gas field development project in China has a diameter of 20 inches, a span of 45 m, and a self-weight reaching 75 Te), the self-weight load is large, the occupied space is large, and the supporting hoisting structure (which is often a truss or a frame type, and the weight also reaches more than 70 tons) is correspondingly huge and complex. According to the above method, the stability calculation of the barge fails, and the offshore hoisting cannot be achieved, so it is not applicable.

[0004] Therefore, it is urgent to design a method for installing a three-dimensional steel cross-connecting pipe to solve the above-mentioned problems. Summary of the Invention

[0005] In order to solve the technical problems of large self-weight load and large occupied space of the hoisting structure mentioned in the background art, a method for installing a three-dimensional steel cross-connecting pipe is provided.

[0006] To achieve the above object, the specific technical solution of the method for installing a three-dimensional steel cross-connecting pipe of the present invention is as follows:

[0007] A method for installing a three-dimensional steel cross-connecting pipe includes the following steps:

[0008] S1. The cross-connecting pipe barge is moored to the dock, and the floating crane ship is docked at the hoisting truss and the cross-connecting pipe at the front of the dock;

[0009] S2. Align the floating crane ship with the barge, and lower the crane on the floating crane ship so that the cross-connecting pipe is seated on the cross-connecting pipe support structure;

[0010] S3. Continue to lower, the hoisting truss is seated on the support structure, and the rigging between the hoisting truss and the cross-connecting pipe body is released;

[0011] S4. Lift and hoist the lifting truss, place the lifting truss on the barge deck, and then the barge arrives at the installation site;

[0012] S5. The barge docks with the main working vessel, and the main working vessel hoists the lifting truss on the barge deck and seats it on the support structure;

[0013] S6. Connect the rigging between the lifting truss and the crossover pipe body;

[0014] S7. The main working vessel hoists the lifting truss again, the rigging is straightened, and continue to hoist until the crossover pipe leaves the support structure to complete the offshore hoisting.

[0015] Further, before step S1, the following steps are also included

[0016] Complete the hoisting design and ship loading design, and clarify the layout of the crossover pipe, lifting truss, support structure, supporting structure and cloud platform on the barge;

[0017] Build and install the lifting truss, support structure, supporting structure and cloud platform;

[0018] Mark the center of gravity position of the crossover pipe on the barge deck.

[0019] Further, in step S1, first hook the top rigging of the lifting truss to the main hook of the floating crane, and the floating crane slowly hoists the lifting truss until the main hook, the center of gravity of the truss and the center of gravity of the crossover pipe are vertically coincident, and then the crossover pipe and the truss leave the dock as a whole.

[0020] Further, in step S3, there are lowering and seating guiding limit rods above the two support structures. When the lifting truss is lowered, the joints between the two cross braces of the lifting truss and the main body are stuck into the guiding limit rods.

[0021] Further, after the joints between the two cross braces and the main body are stuck into the guiding limit rods, the lifting truss slowly descends along the guiding limit rods until the lifting truss is seated on the support structure.

[0022] Further, in step S3, the following steps are also included:

[0023] After the ship loading is completed, full welding is carried out on all the supporting structures;

[0024] Weld the limiting structure around the lifting truss and deploy the tail rope control rigging for offshore hoisting on the lifting truss;

[0025] After various inspections and confirmations before transportation, the barge casts off its moorings and leaves the dock and sails to the site.

[0026] Further, before the main working vessel hoists in step S5:

[0027] Deploy the winch to control the tail rope and the man-pulled tail rope to assist in hoisting.

[0028] Further, in step S7, after the hoisting truss leaves the end face of the deck, increase the hoisting radius until the hoisting truss leaves the deck.

[0029] Further, a pan-tilt is provided on the barge, and personnel board the pan-tilt to connect or disconnect the rigging at the top of the hoisting truss with the crossover pipe.

[0030] Further, after step S7, the following steps are further included:

[0031] Release the mooring lines of the barge, the main operating vessel moves backward and away from the barge, and at the same time control the extraction of the tail rope to complete the offshore hoisting and start the lowering into the water.

[0032] The three-dimensional structured steel crossover pipe installation method of the present invention has the following advantages:

[0033] 1. Effectively solve the transportation and hoisting problems of large-size three-dimensional structured crossover pipes: For large-size and three-dimensional space structured crossover pipes, overcome the limitations of the traditional flat structured crossover pipe installation method, that is, through the combined structure of the hoisting truss, the support mechanism and the support mechanism, ensure the stability and precise docking of the crossover pipe during the land loading onto the ship and the offshore hoisting process.

[0034] 2. Reduce the stability risk of barge transportation: Adopt the method of step-by-step hoisting, that is, first transport the truss alone and then hoist it as a whole, avoiding the problems of overloading or center-of-gravity imbalance of the barge during traditional integral hoisting.

[0035] 3. Reduce the risk of damage to the crossover pipe: Utilize staged rigging connection / disconnection to avoid deformation of the crossover pipe caused by uneven stress on the rigging.

[0036] 4. Optimize the operation process and improve the installation efficiency: Adopt the operation mode of cooperation between the dock and offshore operations, realize seamless connection between land loading onto the ship and offshore hoisting, and reduce the offshore operation time.

[0037] 5. Strong applicability, can be extended to the installation of similar heavy-load complex structures: This method is not only applicable to the crossover pipes in deep-water oil and gas development, but also can be extended to similar scenarios such as subsea pipelines and large steel structures. In addition, structures such as the support structure, the support structure, and the pan-tilt can be prefabricated to adapt to the installation requirements of crossover pipes of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a flow chart of the three-dimensional structured steel crossover pipe installation method of the present invention;

[0039] Figure 2 is the initial layout of the transportation barge of the present invention;

[0040] Figure 3 is a schematic diagram of the integral hoisting of the crossover pipe and the hoisting truss of the present invention;

[0041] Figure 4 This is a schematic structural view of the crossover pipe after being hoisted onto the barge and seated on the pier and the hoisting truss in the present invention;

[0042] Figure 5 This is a schematic structural view of the pier and the crossover pipe in the present invention;

[0043] Figure 6 This is a schematic structural view of the tower in the present invention;

[0044] Figure 7 This is a schematic structural view of the pan-tilt in the present invention;

[0045] Figure 8 This is a schematic view of the transportation layout when the hoisting truss is seated on the barge deck in the present invention;

[0046] Figure 9 This is a top view of the main working ship hoisting the hoisting truss in the present invention;

[0047] Figure 10 This is a side view of the main working ship hoisting the hoisting truss in the present invention;

[0048] Figure 11 This is a top view of the main working ship hoisting the hoisting truss and the crossover pipe as a whole in the present invention;

[0049] Figure 12 This is a side view of the main working ship hoisting the hoisting truss and the crossover pipe as a whole in the present invention.

[0050] Explanation of the marks in the figure:

[0051] 0. Front of the wharf; 1. Barge; 2. Crossover pipe; 3. Hoisting truss; 4. Cross brace; 5. Tower; 6. Guide limiting rod; 7. Limiting structure; 8. Pan-tilt; 9. Pier; 10. Rigging; 11. Main working ship; 12. Crane; 13. Winch; 14. Tail rope. Detailed implementation manners

[0052] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0053] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0054] The following refers to the attached Figure 1 to the attached Figure 12 Describe a method for installing a three-dimensional steel cross-connecting pipe of the present invention.

[0055] Figure 1 It is a flowchart of the method for installing the three-dimensional steel cross-connecting pipe of this embodiment.

[0056] This embodiment provides a method for installing a three-dimensional steel cross-connecting pipe, as Figure 1 shown, the method includes the following steps:

[0057] S1. The barge 1 of the cross-connecting pipe 2 is berthed at the dock, and the floating crane ship is docked at the lifting truss 3 and the cross-connecting pipe 2 at the front of the dock 0;

[0058] S2. Align the floating crane ship with the barge 1, and lower the crane 12 on the floating crane ship to seat the cross-connecting pipe 2 on the cross-connecting pipe 2 support structure;

[0059] S3. Continue to lower, the lifting truss 3 seats on the support structure, and release the rigging 10 between the lifting truss 3 and the cross-connecting pipe 2 body;

[0060] S4. Lift the lifting truss 3 and place the lifting truss 3 on the deck of the barge 1, and then the barge 1 arrives at the installation site;

[0061] S5. The barge 1 is berthed at the main working ship 11, and the main working ship 11 lifts the lifting truss 3 on the deck of the barge 1 and seats it on the support structure;

[0062] S6. Connect the rigging 10 between the lifting truss 3 and the cross-connecting pipe 2 body;

[0063] S7. The main working ship 11 lifts the lifting truss 3 again, the rigging 10 is straightened, and continue to lift, the cross-connecting pipe 2 leaves the support structure, and the offshore lifting is completed.

[0064] The method for installing the three-dimensional steel cross-connecting pipe of this embodiment has the following advantages:

[0065] 1. Effectively solve the transportation and hoisting problems of the large-sized three-dimensional configuration crossover pipe 2: For the large-sized and three-dimensional space configuration crossover pipe 2, it overcomes the limitations of the installation method of the traditional planar configuration crossover pipe 2, that is, through the combined structure of the hoisting truss 3, the support mechanism and the support mechanism, to ensure the stability and precise docking of the crossover pipe 2 during the land-to-ship loading and offshore hoisting processes.

[0066] 2. Reduce the transportation stability risk of the barge 1: Adopt the step-by-step hoisting method, that is, first transport the truss alone and then hoist it as a whole, to avoid the problems of overloading or center-of-gravity imbalance of the barge 1 during traditional integral hoisting.

[0067] 3. Reduce the damage risk of the crossover pipe 2: Utilize the staged connection / disconnection of the rigging 10 to avoid the deformation of the crossover pipe 2 caused by uneven stress on the rigging 10.

[0068] 4. Optimize the operation process and improve the installation efficiency: Adopt the collaborative operation method of the dock and offshore operations to achieve seamless connection between land-to-ship loading and offshore hoisting, and reduce the offshore operation time.

[0069] 5. Strong applicability and can be extended to the installation of similar heavy-load and complex structures: This method is not only applicable to the crossover pipe 2 in deepwater oil and gas development, but can also be extended to similar scenarios such as subsea pipelines and large steel structures. In addition, structures such as the support structure, the support structure, and the pan-tilt 8 can be prefabricated to adapt to the installation requirements of crossover pipes 2 of different sizes.

[0070] Figure 2 is the initial layout of the transportation barge; Figure 3 is the overall hoisting schematic diagram of the crossover pipe and the hoisting truss; Figure 4 is the structural schematic diagram after the crossover pipe is hoisted onto the barge and seated on the pier and the hoisting truss; Figure 5 is the structural schematic diagram of the pier and the crossover pipe; Figure 6 is the structural schematic diagram of the tower; Figure 7 is the structural schematic diagram of the pan-tilt.

[0071] Furthermore, as shown in Figure 1 , Figure 2 and Figure 7 , a pan-tilt 8 is provided on the barge 1, and personnel board the pan-tilt 8 to connect or disconnect the top rigging 10 of the hoisting truss 3 with the crossover pipe 2.

[0072] Furthermore, as shown in Figures 1 - 7 , before step S1, the following steps are also included

[0073] Complete the hoisting design and the ship loading design, and clarify the layout of the crossover pipe 2, the hoisting truss 3, the support structure, the support structure and the pan-tilt 8 on the barge 1;

[0074] Build and install the hoisting truss 3, the support structure, the support structure and the pan-tilt 8;

[0075] Mark the center of gravity position of the crossover pipe 2 on the deck of the barge 1.

[0076] Figure 8 Schematic diagram of the transportation layout when the lifting truss for this embodiment is seated on the barge deck.

[0077] Further, as Figure 8 shown, in step S1, first hook the rigging 10 at the top of the lifting truss 3 to the main hook of the floating crane, and the floating crane slowly lifts the lifting truss 3 until the main hook, the center of gravity of the truss, and the center of gravity of the crossover pipe 2 are vertically coincident. Then, the crossover pipe 2 and the truss as a whole leave the dock.

[0078] It can be understood that the above support structure is configured as a pier 9, and the support structure is set as a tower 5.

[0079] Preferably, before step S1, the following work should be completed:

[0080] Pre-install the lifting rigging 10 of the lifting truss 3 at the construction site and conduct trial lifting and leveling;

[0081] Connect the rigging 10 between the lifting truss 3 and the crossover pipe 2 and conduct overall trial lifting and leveling;

[0082] Transport the lifting truss 3 and the crossover pipe 2 to the front of the ship loading dock 0;

[0083] Lift and arrange the pier 9, tower 5, and cloud platform 8 at the designed positions on the barge 1, and fully weld (full weld) the tower 5 and cloud platform 8, and temporarily weld (spot weld) the pier 9;

[0084] Preferably, in step S1, the side of the tower 5 and cloud platform 8 on the barge 1 is against the dock, and the side of the pier 9 is away from the dock and faces the port basin, so that the floating crane does not need to cross the tower 5 and cloud platform 8 when hoisting the crossover pipe 2 onto the ship to meet its lifting height capacity.

[0085] It should be noted that in order to reduce the risk of collision damage to the crossover pipe 2 during ship loading and hoisting, soft materials such as rubber sheets need to be deployed at relevant parts of the above structures. After that, it is necessary to spray paint and mark the center of gravity position of the crossover pipe 2 on the deck of the barge 1.

[0086] Preferably, in step S1, first hook the rigging 10 at the top of the lifting truss 3 to the main hook of the floating crane, and the floating crane slowly lifts the lifting truss 3. Check and confirm that the connection of the rigging 10 between the lifting truss 3 and the crossover pipe 2 is intact, continue to lift and straighten it, ensure that the main hook, the center of gravity of the truss, and the center of gravity of the crossover pipe 2 are vertically coincident at this time, and continue to lift, and the crossover pipe 2 and the truss as a whole leave the dock.

[0087] Preferably, in step S2, after the floating crane hoists the truss and docks it with the crossover pipe 2, the ship should be slowly moved to avoid swaying. The crane boom should be perpendicular to the barge 1, and the center of the hook should be directly opposite the center of gravity of the crossover pipe 2.

[0088] Preferably, in step S2, when the crossover pipe 2 is lowered close to the pier 9, if there is a discrepancy between the position of the pier 9 and the crossover pipe 2, the pier 9 needs to be unwelded and relocated to meet the matching requirements.

[0089] Figure 9 This is a top view of the main working ship in this embodiment hoisting the truss.

[0090] Further, as Figure 9 shown, in step S3, above the two support structures, there are lowering and seating guiding and limiting rods 6. When the hoisting truss 3 is lowered, the two cross braces 4 of the hoisting truss 3 are stuck into the guiding and limiting rods 6 at the junction with the main body.

[0091] Specifically, after the two cross braces 4 are stuck into the guiding and limiting rods 6 at the junction with the main body, the hoisting truss 3 slowly descends along the guiding and limiting rods 6 until the hoisting truss 3 is seated on the support structure.

[0092] Further, in step S3, the following steps are also included:

[0093] After the ship loading is completed, full welding is performed on all the support structures;

[0094] Weld the limiting structure 7 around the hoisting truss 3, and deploy the tail rope 14 for offshore hoisting on the hoisting truss 3 to control the rigging 10;

[0095] After various inspections and confirmations before transportation, the barge 1 casts off its moorings and leaves the dock, and sails to the site.

[0096] Optionally, as Figure 9 shown, in step S3, for the rigging 10 at the arch top of the crossover pipe 2, personnel need to board the cloud platform 8 to unhook it. The rigging 10 close to the deck surface can be directly unhooked or unhooked by erecting a scaffolding. Since the rigging 10 includes a chain and an ROV hook and has a certain weight, personnel can carry auxiliary tools such as a chain block. After the deconstruction is completed, the hooking operation is carried out, and an offshore hooking simulation is performed, and then the deconstruction is carried out again, and the personnel leave the cloud platform 8.

[0097] Figure 10 This is a side view of the main working ship in this embodiment hoisting the truss.

[0098] Preferably, as Figure 9 and Figure 10 shown, in step S4, similarly, the truss is slowly hoisted along the guiding and limiting rod 6 at the top of the tower 5, crosses the limiting rod, then the ship is moved and the crane boom is adjusted, and it is placed on the other side deck of the barge 1, unhooked, and the floating crane leaves the site.

[0099] Preferably, in step S4, there is a cross brace 4 on the hoisting truss 3 that protrudes beyond the ship's side. The dock needs to be equipped with a bumper ball arrangement that exceeds the protruding distance between the barge 1 and the dock to avoid interference. If not, after the hoisting truss 3 is seated, the floating hook head together with the truss rigging 10 is lowered to the deck of the barge 1, the rigging 10 connection between the hoisting truss 3 and the hook head is released, the floating crane temporarily leaves the site, the barge 1 turns around and docks at the dock, and the floating crane enters the site again to hook and hoist the hoisting truss 3.

[0100] Preferably, in step S4, the pier 9 is fully welded, a limiting structure 7 is welded around the hoisting truss 3, the auxiliary rigging 10 for offshore hoisting is deployed on the hoisting truss 3, and after various inspections and confirmations before transportation, the barge 1 casts off its moorings and leaves the dock and sails to the site.

[0101] Further, in step S5, before the main working ship 11 hoists:

[0102] Deploy a winch 13 to control the tail rope 14 and a manual pull tail rope 14 to assist in hoisting.

[0103] Specifically, in step S5, before the main working ship 11 hoists:

[0104] The steel wire ropes of two winches 13 on the main working ship 11 are pulled out and connected to the pre-installed hoisting control rigging 10 on the hoisting truss 3 on the deck of the barge 1, keeping it slack, and 4 manual pull control tail ropes 14 are deployed on the hoisting truss 3.

[0105] Figure 11 This is a top view of the main working ship of the present invention hoisting the hoisting truss and the crossover pipe as a whole.

[0106] Preferably, as Figure 11 shown, in step S5, the barge 1 docks at the main working ship 11 at a position where the center of the crossover pipe 2 is vertically aligned with the center of the crane 12, and the relevant personnel of the main working ship 11 shuttle onto the barge 1 to conduct various inspections before hoisting.

[0107] Preferably, in step S6, the staff can complete all the rigging 10 connections between the hoisting truss 3 and the crossover pipe 2 according to the simulated hook-up operation in S3, thus avoiding dock interference.

[0108] Further, in step S7, when the hoisting truss 3 leaves the deck end face, increase the hoisting radius until the hoisting truss 3 leaves the deck.

[0109] Figure 12 This is a side view of the main working ship of the present invention hoisting the hoisting truss and the crossover pipe as a whole.

[0110] Specifically, as Figure 12 shown, in step S7, the following steps are further included:

[0111] Adjust the crane 12 so that the center of gravity of the hoisting truss 3 is directly above the center of gravity of the crossover pipe 2.

[0112] Continue to hoist until the sling 10 between the hoisting truss 3 and the crossover pipe 2 is in a straight and non-loaded state. The personnel quickly remove the sea fastener sling 10 of the crossover pipe 2 and continue to hoist slowly. The crossover pipe 2 is separated from the pier 9 and leaves the deck of the barge 1 by 2 - 3 m.

[0113] Further, after step S7, the following steps are further included:

[0114] Release the mooring lines of the barge 1, the main working vessel 11 moves backward and away from the barge 1, and at the same time, control the tail rope 14 to be pulled out to complete the offshore hoisting and start the lowering into the water.

[0115] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A method for installing a three-dimensional steel jumper pipe, characterized in that: The following steps are involved: S1. The jumper barge is docked at the pier, and the floating crane is docked at the lifting truss and jumper at the front of the pier; S2, make the floating crane face the barge, and lower the crane on the floating crane so that the jumper pipe is seated on the jumper pipe support structure; S3, continue to lower, the hoisting truss is seated on the supporting structure, and the rigging between the hoisting truss and the jumper body is released; S4, hoisting the hoisting truss, placing the hoisting truss on the barge deck, and then the barge arrives at the installation site; S5. The barge berths close to the main operation ship, and the main operation ship lifts the lifting truss on the barge deck and seats it on the supporting structure; S6, connect the rigging between the lifting truss and the jumper pipe body; S7. The main operation vessel lifts the hoisting truss again, straightens the rigging, continues lifting, and the jumper pipe leaves the supporting structure to complete the offshore lifting.

2. The method for installing a three-dimensional steel jumper pipe according to claim 1, characterized in that: Before step S1, the method further includes the following steps: Complete the lifting design and loading design, and clarify the layout of the jumper pipe, lifting truss, support structure, and supporting structure on the barge; Construct and install lifting trusses, support structures, and bracing structures; Mark the jumper's center of gravity on the barge deck.

3. The method for installing a three-dimensional steel jumper pipe according to claim 1, characterized in that: In step S1, the top rigging of the lifting truss is first hooked to the main hook of the floating crane, and the floating crane slowly lifts the lifting truss until the center of gravity of the main hook, the truss and the center of gravity of the jumper pipe are vertically overlapped, and then the jumper pipe and the truss leave the dock as a whole.

4. The method for installing a three-dimensional steel jumper pipe according to claim 1, characterized in that: In step S3, lowering and seating guide limit rods are provided above the two supporting structures. When the hoisting truss is lowered, the intersections of the two cross braces of the hoisting truss and the main body are clamped into the guide limit rods.

5. The method for installing a three-dimensional steel jumper pipe according to claim 4, characterized in that: After the guide limit rods are inserted into the intersections of the two cross braces and the main body, the hoisting truss slowly falls along the guide limit rods until the hoisting truss is seated on the supporting structure.

6. The method for installing a three-dimensional steel jumper pipe according to claim 1, characterized in that: In step S3, the following steps are also included: After loading, all supporting structures are fully welded; Weld the limiting structure around the lifting truss and deploy the tail rope control rigging for offshore lifting on the lifting truss; After various inspections and confirmations before transportation, the barge untied the moorings, left the dock, and set sail for transportation to the site.

7. The method for installing a three-dimensional steel jumper pipe according to claim 1, characterized in that: In step S5, before the main operation vessel is lifted: Deploy the winch to control the tail rope and people pull the tail rope to assist in lifting.

8. The method for installing a three-dimensional steel jumper pipe according to claim 1, characterized in that: In step S7, after the hoisting truss leaves the end surface of the deck, the hoisting radius is increased until the hoisting truss leaves the deck.

9. The method for installing a three-dimensional steel jumper pipe according to any one of claims 1 to 8, characterized in that: A pan head is provided on the barge, and personnel go up to the pan head to connect or release the top rigging of the lifting truss to the jumper pipe.

10. The method for installing a three-dimensional steel jumper pipe according to any one of claims 1 to 8, characterized in that: After step S7, the method further includes the following steps: The barge is untied, and the main operating vessel moves in the opposite direction away from the barge. At the same time, the tail rope is controlled to be pulled out to complete the offshore lifting and start lowering into the water.

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