CN118030955A - Submarine pipeline bottom crossing treatment method - Google Patents
Submarine pipeline bottom crossing treatment method Download PDFInfo
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- CN118030955A CN118030955A CN202410253000.6A CN202410253000A CN118030955A CN 118030955 A CN118030955 A CN 118030955A CN 202410253000 A CN202410253000 A CN 202410253000A CN 118030955 A CN118030955 A CN 118030955A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002689 soil Substances 0.000 claims abstract description 24
- 239000004576 sand Substances 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 210000002445 nipple Anatomy 0.000 claims description 36
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 7
- 238000010926 purge Methods 0.000 claims description 7
- 230000001012 protector Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims 5
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005507 spraying Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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Abstract
The invention discloses a submarine pipeline bottom crossing treatment method, which belongs to the technical field of ocean engineering and comprises the following steps: when a newly built pipeline is paved to a position close to a crossing point of the built pipeline, a temporary short joint is installed to cross the built pipeline; the crossing processing operation ship is anchored in place at a crossing preset position; removing the temporary short section and recycling to the cross processing operation; excavating soil around the built pipeline; excavating soil around the newly-built pipeline; measuring the distance between the flange end faces of the newly-built pipeline; prefabricating a permanent pup joint; the crossover treatment operation ship lowers the permanent pup joint at the designed position of the crossing area; connecting the permanent short joint with a newly-built pipeline flange; respectively covering the newly-built pipelines at the crossing positions with concrete pressing blocks according to design requirements for protection; and (5) sand throwing backfilling is carried out on the built pipeline. According to the treatment scheme for traversing the bottom of the built pipeline, the adverse effect on the built pipeline is effectively reduced, and the safety protection level of the newly built submarine pipeline is improved.
Description
Technical Field
The invention belongs to the technical field of ocean engineering, and particularly relates to a submarine pipeline bottom crossing treatment method.
Background
At present, with the large development of ocean oil gas, a submarine pipeline network is more and more complicated, the problem that a newly built submarine pipeline cannot be crossed with an established pipeline is often faced, and when the newly built pipeline and the established buried pipeline cross, two conventional treatment methods are as follows:
(1): directly paving a new pipeline on the seabed without treating the built pipeline, or paving the new pipeline after pre-filling a concrete block on the seabed, and finally paving a concrete block or manually backfilling sand above the new pipeline for protection;
(2): and (3) treating the built pipeline, namely spraying and sinking the built pipeline in a local range, paving a concrete pressing block above the built pipeline for protection, paving a new pipeline, and performing manual sand backfill protection on the new pipeline.
The submarine pipeline crossing treatment method has the following problems:
⑴ After the newly-built pipeline is positioned above the seabed and is protected and constructed, a higher bulge can be formed on the seabed, so that the navigation of the water area where the newly-built pipeline is positioned has a certain influence, and meanwhile, if the navigation of the sea area where the newly-built pipeline is positioned is frequent, the newly-built pipeline can be caused to bear a higher risk of accidental damage.
⑵ There is a possibility that the owner of the established pipeline will not allow construction operations to be performed on its pipeline. If the built pipeline is subjected to a certain range of spraying sinking under the allowable condition, the stress of the built pipeline can be influenced by improper operation in the operation process, and then the pipeline is damaged.
Therefore, there is a need to design a submarine pipeline bottom crossing treatment method to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a submarine pipeline bottom crossing treatment method, which has the advantages of effectively reducing adverse effects on established pipelines, improving the safety protection level of newly-built submarine pipelines and solving the problems in the background technology.
In order to achieve the purpose, the specific technical scheme of the submarine pipeline bottom traversing treatment method is as follows:
the submarine pipeline bottom crossing treatment method comprises the following steps:
s1, installing a temporary short joint to span an established pipeline when a newly established pipeline is paved to a position close to a crossing point of the established pipeline;
S2, anchoring the cross processing operation ship in place at a crossing preset position;
S3, removing the temporary short section and recycling to the cross processing operation;
S4, excavating soil around the built pipeline and supporting the bottom of the suspended pipeline by adopting a sand bag;
s5, excavating soil around the newly-built pipeline;
s6, measuring the distance between the flange end faces of the newly-built pipeline;
S7, prefabricating a permanent pup joint;
S8, lowering a permanent short joint at a crossing area design position by the crossing processing operation ship;
s9, dragging the permanent pup joint to the lower part of the built pipeline;
s10, connecting the permanent short joint with a newly-built pipeline flange;
S11, respectively covering the newly-built pipelines at the crossing positions with concrete pressing blocks according to design requirements for protection;
s12, sand throwing backfilling is carried out on the built pipeline.
Further, in S1, the new pipeline is laid by a pipe laying ship, and when the temporary nipple is installed on the normal pipe section of the new pipeline, the temporary nipple is connected to the normal pipe section by the welding neck flange, and the temporary nipple is laid onto the seabed together with the new pipeline.
Further, in S2, the anchor line is kept at a safe distance from the newly-built pipe and the established pipe.
Further, in S3, the diver releases the flange bolts by launching the water, removes the temporary nipple after the inside of the pipe is filled with water and recovers to the crossover treatment vessel.
Further, in S4, firstly, a non-contact trencher is used to locally purge the soil above the built pipeline to expose the pipeline, then, a non-contact trencher is used to excavate and purge the soil below the built pipeline, after the excavation of the soil below the two sides of the built pipeline is completed, a sand bag is used to support the bottom of the suspended pipeline, and then, the non-excavated soil below the built pipeline is excavated to form an operation foundation pit.
Further, in S5, a non-contact trencher is used to excavate the conventional section, the transition section and the crossing local deepening section of the newly built pipeline, and the excavation depth needs to meet the design requirement.
Further, in S7, the rotary flange and the ball flange are welded at the two ends of the permanent pup joint respectively, nondestructive inspection is carried out on the welded joint, after the inspection is qualified, the flanges at the two ends are sealed by adopting blind plates, and the flange protectors are arranged at the bottoms of the connecting flanges at the two ends.
Further, in S8, after the crossing processing operation ship is precisely positioned at the designed position of the crossing area, the permanent pup joint is lowered and positioned on the mud surface at the bottom of the seabed appointed by the crossing point through the cooperation of the ship crane and the lifting rope, and after the lowering is completed, the lifting rope and the swinging rope are removed.
Further, in S9, a winch is arranged on the cross treatment operation ship, a guide pulley foundation is arranged at a designated position at the bottom of the seabed, a steel wire rope is guided to pass through the guide pulley and the built pipeline, the steel wire rope is connected to a lifting lug on the end face of the blind plate of the permanent nipple, and the winch is started to drag the permanent nipple to the position below the built pipeline.
Further, in S10, the blind plates at the two ends of the permanent short section are removed, the flange faces of the permanent short section and the newly-built pipe head are adjusted and aligned, the flange bolts are fastened through a hydraulic wrench or a hydraulic stretcher, the flanges are made to realize underwater assembly, sealing and connection, then back pressure testing is conducted on the connecting flanges at the two sides, and after the connection is qualified, the steel wire rope and the guide pulley foundation are removed and recovered.
The invention has the following advantages: according to the treatment scheme for traversing the bottom of the built pipeline, the adverse effect on the built pipeline is effectively reduced, and the safety protection level of the newly built submarine pipeline is improved.
Drawings
FIG. 1 is a schematic flow chart of a submarine pipeline bottom traversing treatment method of the invention;
FIG. 2 is a schematic diagram of the construction of a temporary nipple for a cross-site pipelaying vessel of the present invention;
FIG. 3 is an enlarged schematic view of the structure of FIG. 2A according to the present invention;
FIG. 4 is a schematic view of the construction of the cross-over handling vessel anchor according to the present invention;
FIG. 5 is a schematic diagram of the structure of the newly built pipe and the built pipe spanning in place according to the present invention;
FIG. 6 is a schematic diagram of the construction of the excavation of soil around a constructed pipeline in accordance with the present invention;
FIG. 7 is a schematic diagram of a structure of a multi-section excavation of a newly built pipeline according to the present invention;
FIG. 8 is a schematic structural view of a permanent nipple of the present invention;
FIG. 9 is a schematic view of the lowering structure of the permanent nipple of the present invention;
FIG. 10 is a schematic view of the construction of a permanent nipple of the present invention traversing an established pipe;
FIG. 11 is a schematic illustration of the construction of a permanent nipple connection of the present invention;
FIG. 12 is a schematic diagram of the structure of the present invention for cross-over position protection;
The figure indicates: 1. newly-built pipelines; 11. a temporary nipple; 12. welding a neck flange; 13. a built pipeline; 14. a conventional section; 15. a transition section; 16. crossing the locally deepened section; 2. a pipe laying ship; 21. a sand bag; 3. crossing the processing operation ship; 31. a buoy; 32. an anchor cable; 4. a permanent nipple; 41. a blind plate; 42. a flange protector; 43. a ball flange; 44. rotating the flange; 45. lifting lugs; 46. a hanging rope; 47. rope shaking; 5. sea level; 51. seabed. 52. Sand; 6. a winch; 61. a guide pulley foundation; 62. a wire rope; 7. and (5) concrete pressing blocks.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
A submarine pipeline bottom ride through treatment method according to the present invention will be described with reference to fig. 1 to 12.
The existing submarine pipeline crossing treatment method at present has the following problems:
⑴ After the newly-built pipeline is positioned above the seabed and is protected and constructed, a higher bulge can be formed on the seabed, so that the navigation of the water area where the newly-built pipeline is positioned has a certain influence, and meanwhile, if the navigation of the sea area where the newly-built pipeline is positioned is frequent, the newly-built pipeline can be caused to bear a higher risk of accidental damage.
⑵ There is a possibility that the owner of the established pipeline will not allow construction operations to be performed on its pipeline. If the built pipeline is subjected to a certain range of spraying sinking under the allowable condition, the stress of the built pipeline can be influenced by improper operation in the operation process, and then the pipeline is damaged.
The invention therefore comprises the following steps:
S1, installing a temporary short joint 11 to span the built pipeline 13 when the newly built pipeline 1 is paved to a position close to the crossing point of the built pipeline 13;
Specifically, the newly-built pipeline 1 is laid by the pipe-laying ship 2, and when the temporary nipple 11 is installed on the normal pipe section of the newly-built pipeline 1, the temporary nipple 11 is connected to the normal pipe section through the neck flange 12, and the temporary nipple 11 is laid onto the seabed 51 together with the newly-built pipeline 1.
S2, anchoring the cross processing operation ship 3 in place at a crossing preset position;
Specifically, the cross processing operation ship 3 is anchored in place at a crossing preset position, and warning buoys 31 with different colors are arranged in the sea surface area above the built pipeline 13, so that a 24h warning effect is realized.
Preferably, the anchor line 32 is kept at a safe distance from the newly built pipe 1 and the established pipe 13.
S3, removing the temporary nipple 11 and recycling to the cross processing operation;
specifically, the diver releases the flange bolts by launching water, removes the temporary nipple 11 after the water in the pipeline is stabilized, and recovers the temporary nipple to the crossover treatment work ship 3.
S4, excavating soil around the built pipeline 13 and supporting the bottom of the suspended pipeline by adopting a sand bag 21;
Specifically, firstly, a non-contact type trencher is adopted to locally purge soil above the built pipeline 13 to expose the pipeline, then, the non-contact type trencher is adopted to excavate and purge soil below the built pipeline 13, after the excavation of the soil below the two sides of the built pipeline 13 is completed, a sand bag 21 is adopted to support the bottom of the suspended pipeline, and then, the non-excavated soil below the built pipeline 13 is excavated to form an operation foundation pit.
Preferably, the excavation and purging sequence of the built pipeline 13 is gradually constructed towards the direction close to the crossing point from the side far away from the crossing point, and after the soil below the two sides of the built pipeline 13 far away from the crossing point is excavated and the support is completed, the soil right below the built pipeline 13 is excavated.
S5, excavating soil around the newly-built pipeline 1;
Specifically, a non-contact trencher is adopted to excavate the conventional section 14, the transition section 15 and the crossing local deepening section 16 of the newly-built pipeline 1 respectively, the excavation depth is required to meet the design requirement, and for the local trench with the size and depth which cannot meet the requirements, a diver can carry an underwater high-pressure water gun to excavate finely.
S6, measuring the distance between the flange end faces of the newly-built pipeline 1;
specifically, a flange measuring instrument is used for measuring the distance between the flange end faces connected with normal pipe sections at the two sides of the crossing point of the newly-built pipeline 1, and data are recorded.
S7, prefabricating a permanent pup joint 4;
Specifically, a permanent nipple 4 is prefabricated on land or a ship, two ends of the permanent nipple 4 are respectively welded with a rotary flange 44 and a ball flange 43, nondestructive inspection is carried out on a welded joint, after the inspection is qualified, the flanges at two ends are sealed by a blind plate 41, and flange protectors 42 are arranged at the bottoms of the connecting flanges at two side ends.
Preferably, one side of the permanent nipple 4 is connected with the rotary flange 44, and the other side is connected with the ball flange 43, so that the underwater connection difficulty of the permanent nipple 4 and the pipe end flange of the newly-built pipeline 1 can be reduced. The ball flange 43 can provide a connection deviation of + -10 DEG, and the ring body of the rotary flange 44 can realize 360 DEG rotation, so that the bolt assembly is facilitated.
S8, the crossover treatment operation ship 3 lowers the permanent pup joint 4 at a crossing area design position;
specifically, after the crossing treatment operation ship 3 is precisely positioned at the designed position of the crossing area, the permanent pup joint 4 is lowered to the position below the sea level 5 through the cooperation of the ship crane and the lifting rope 46 and is positioned on the mud surface at the bottom of the seabed 51 designated by the crossing point, and after the lowering is completed, the lifting rope 46 and the shaking rope 47 are removed.
Preferably, in order to prevent the permanent pup joint 4 from sinking into the mud surface of the seabed 51, an air bag can be bound on the permanent pup joint 4 and inflated, so that the negative buoyancy of the permanent pup joint 4 is close to zero.
S9, dragging the permanent pup joint 4 to the lower part of the built pipeline 13;
Specifically, a winch 6 is arranged on the cross treatment operation ship 3, a guide pulley foundation 61 is installed at a designated position at the bottom of the seabed 51, a steel wire rope 62 is led to pass through the guide pulley and the built pipeline 13, the steel wire rope 62 is connected to a lifting lug 45 on the end face of the blind plate 41 of the permanent nipple 4, and the winch 6 is started to drag the permanent nipple 4 to the position below the built pipeline 13.
Preferably, the dimensions of the guide pulley foundation 61, the anti-sinking measure and the wire rope 62 are determined according to the bearing capacity of the seabed 51 and the drag force of the permanent pup joint 4.
S10, connecting the permanent short joint 4 with a flange of the newly-built pipeline 1;
Specifically, the blind plates 41 at the two ends of the permanent nipple 4 are removed through cooperation of a ship crane and a diver, flange faces of the permanent nipple 4 and the newly-built pipe 1 are adjusted and aligned, flange bolts are fastened through a hydraulic wrench or a hydraulic stretcher, underwater assembly, sealing and connection of the flanges are achieved, back pressure testing is conducted on the connecting flanges at the two sides, and after the connecting flanges are qualified, the steel wire ropes 62 and the guide pulley foundation 61 are removed and recovered.
And then the diver performs underwater exploring inspection, if the permanent pup joint 4 is found to be locally suspended, the suspended position can be filled by a sand bag 21, so that the soil body below the permanent pup joint 4 can provide support after the connection is completed.
S11, respectively covering the newly-built pipeline 1 at the crossing position with concrete pressing blocks 7 according to design requirements for protection;
s12, sand throwing 52 backfilling is carried out on the built pipeline 13;
specifically, the operation foundation pit below the built pipeline 13 and the ditching part above the built pipeline 13 are backfilled with sand 52, and the embedded state of the built pipeline 13 is restored according to the design requirement.
By the treatment scheme of traversing from the bottom of the built pipeline 13, the invention effectively reduces the adverse effect on the built pipeline 13 and improves the safety protection level of the newly built submarine pipeline.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The submarine pipeline bottom crossing treatment method is characterized by comprising the following steps of:
s1, installing a temporary short joint to span an established pipeline when a newly established pipeline is paved to a position close to a crossing point of the established pipeline;
S2, anchoring the cross processing operation ship in place at a crossing preset position;
S3, removing the temporary short section and recycling to the cross processing operation;
S4, excavating soil around the built pipeline and supporting the bottom of the suspended pipeline by adopting a sand bag;
s5, excavating soil around the newly-built pipeline;
s6, measuring the distance between the flange end faces of the newly-built pipeline;
S7, prefabricating a permanent pup joint;
S8, lowering a permanent short joint at a crossing area design position by the crossing processing operation ship;
s9, dragging the permanent pup joint to the lower part of the built pipeline;
s10, connecting the permanent short joint with a newly-built pipeline flange;
S11, respectively covering the newly-built pipelines at the crossing positions with concrete pressing blocks according to design requirements for protection;
s12, sand throwing backfilling is carried out on the built pipeline.
2. The submarine pipeline bottom traversing processing method according to claim 1, wherein in S1, a newly built pipeline is laid by a pipe laying ship, and when a temporary nipple is installed on a normal pipe section of the newly built pipeline, the temporary nipple is connected to the normal pipe section by a welding neck flange, and the temporary nipple is laid on the seabed together with the newly built pipeline.
3. The submarine pipeline bottom ride through processing method according to claim 1, wherein in S2, the anchor lines are kept at a safe distance from the newly built pipeline and the established pipeline.
4. The submarine pipeline bottom traversing treatment method according to claim 1, wherein in S3, the diver releases the flange bolts by running down, removes the temporary nipple after the pipeline is filled with water and returns to the traversing treatment operation ship.
5. The method for bottom-through treatment of a submarine pipeline according to claim 1, wherein in S4, firstly, a non-contact trencher is used to locally purge soil above the built pipeline to expose the pipeline, then a non-contact trencher is used to excavate and purge soil below the built pipeline, after excavation of soil below both sides of the built pipeline is completed, a sand bag is used to support the suspended pipeline at the bottom, and then an unexcavated soil below the built pipeline is excavated again to form an operation foundation pit.
6. The submarine pipeline bottom traversing processing method according to claim 1, wherein in S5, a non-contact trencher is used to excavate the conventional section, the transition section and the crossing local deepening section of the newly built pipeline respectively, and the excavation depth is required to meet design requirements.
7. The submarine pipeline bottom traversing treatment method according to claim 1, wherein in the step S7, the rotary flange and the ball flange are welded at two ends of the permanent nipple respectively, nondestructive inspection is performed on the welded joint, after the inspection is qualified, the flanges at two ends are sealed by blind plates, and flange protectors are arranged at the bottoms of the connecting flanges at two side ends.
8. The submarine pipeline bottom traversing processing method according to claim 1, wherein in S8, after the traversing processing operation ship is accurately positioned at the designed position of the crossing area, the permanent pup joint is lowered and positioned on the mud surface at the bottom of the seabed appointed by the crossing point through cooperation of the ship crane and the lifting rope, and after the lowering is completed, the lifting rope and the shaking rope are removed.
9. The submarine pipeline bottom traversing processing method according to claim 7, wherein in S9, a winch is arranged on a traversing processing operation ship, a guide pulley foundation is arranged at a designated position at the bottom of the seabed, a steel wire rope is guided to pass through the guide pulley and the built pipeline, the steel wire rope is connected to a lifting lug on the end face of a blind plate of the permanent nipple, and the winch is started to drag the permanent nipple to the position below the built pipeline.
10. The submarine pipeline bottom traversing treatment method according to claim 9, wherein in S10, blind plates at two ends of the permanent nipple are removed, flange faces of the permanent nipple and the newly built pipeline head are adjusted and aligned, flange bolts are fastened through a hydraulic wrench or a hydraulic stretcher, underwater assembly, sealing and connection of the flanges are achieved, back pressure testing is conducted on connecting flanges at two sides, and after passing, steel wire ropes and guide pulley foundations are removed and recovered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410253000.6A CN118030955A (en) | 2024-03-06 | 2024-03-06 | Submarine pipeline bottom crossing treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410253000.6A CN118030955A (en) | 2024-03-06 | 2024-03-06 | Submarine pipeline bottom crossing treatment method |
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| Publication Number | Publication Date |
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| CN118030955A true CN118030955A (en) | 2024-05-14 |
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| CN202410253000.6A Pending CN118030955A (en) | 2024-03-06 | 2024-03-06 | Submarine pipeline bottom crossing treatment method |
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- 2024-03-06 CN CN202410253000.6A patent/CN118030955A/en active Pending
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