CN117698909A - Underwater tie-back method for single-point pontoon ballasted by adopting counterweight - Google Patents
Underwater tie-back method for single-point pontoon ballasted by adopting counterweight Download PDFInfo
- Publication number
- CN117698909A CN117698909A CN202311472048.8A CN202311472048A CN117698909A CN 117698909 A CN117698909 A CN 117698909A CN 202311472048 A CN202311472048 A CN 202311472048A CN 117698909 A CN117698909 A CN 117698909A
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- Prior art keywords
- pontoon
- rigging
- balancing weight
- crane
- ship
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Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000009434 installation Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000007667 floating Methods 0.000 description 5
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
- B63B2021/203—Mooring cables or ropes, hawsers, or the like; Adaptations thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
- B63B2021/206—Weights attached to mooring lines or chains, or the like; Arrangements thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
- B63B2021/505—Methods for installation or mooring of floating offshore platforms on site
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses an underwater tie-back method for a single-point pontoon ballasted by adopting a counterweight, which comprises the following steps: prefabricating a balancing weight assembly, and preparing for installation operation; the main crane of the construction ship puts the balancing weight assembly into water; the winch rigging is put down by the construction operation ship, and the winch rigging is connected with the balancing weight assembly; the ship crane for construction operation puts down the pontoon into water, connects the pontoon with the counterweight block assembly and transfers the weight of the counterweight block assembly to the pontoon; the ship crane for construction operation integrally lowers the pontoon and the balancing weight assembly to a target position of the seabed, removes a hook head rigging of the crane, and completes pontoon installation; the cable joint assembly of the anchor chain and the pontoon is completed underwater, a rigging between the pontoon and the counterweight block assembly is disconnected, and the pontoon carries the anchor legs to float upwards; and (3) lowering the rigging by the construction ship crane, and recovering the balancing weight assembly. The invention does not need to install the structure on the seabed in advance, reduces the construction workload and facilitates the recovery of auxiliary installation equipment.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to an underwater tie-back method for a single-point pontoon ballasted by adopting a counterweight.
Background
In deep water oil and gas field development, a single point mooring system is used as an important link in an offshore oil and gas field production system, a single point mooring buoy installation mode method is also an important factor influencing oil field construction and secondary application, and two common construction methods at present comprise: the method comprises the steps of installing on water, welding and fixing a mooring buoy and a structure for supporting the mooring buoy on a deck of a floating crane ship in advance, then hoisting a mooring rope by using the floating crane on the ship, and pulling a connecting end of the mooring rope in place by using a winch on the ship to connect, wherein all the construction is carried out on the sea, no constructor works underwater, the construction workload is large, and the safety risk exists; the underwater installation is carried out by placing the single-point pontoon and the structure supporting it on the seabed in advance, and then realizing the connection of the mooring cable and the pontoon by using the auxiliary parties such as a floating crane, a submarine winch, an ROV, a saturated diving, etc., all the work of the method is carried out on the seabed, the structure is required to be installed on the seabed in advance, and the recovery work of auxiliary installation equipment is inconvenient.
Disclosure of Invention
The invention aims to provide an underwater tie-back method for a single-point pontoon ballasted by a counterweight, wherein a counterweight assembly is placed on a seabed through a construction ship main crane, the counterweight assembly is recovered to a certain water depth by utilizing a winch to carry out temporary suspension, the construction ship main crane hoists the pontoon to the water surface, the weight of the counterweight assembly is completely transferred to the bottom of the pontoon, the construction ship main crane integrally lowers the pontoon and the counterweight to the seabed to realize the installation of the pontoon in place, after a diver finishes tie-back of mooring anchor legs to the pontoon, an ROV disconnects the pontoon from a counterweight cable, the pontoon automatically finishes floating, and the ship main crane respectively recovers the combined counterweight to a deck. The invention does not need to install the structure on the seabed in advance, reduces the construction workload and facilitates the recovery of auxiliary installation equipment.
In order to achieve the purpose of the invention, the invention provides an underwater tie-back method for ballasting a single-point pontoon by adopting a counterweight, which comprises the following steps:
s1, a land prefabricated balancing weight assembly, wherein a pontoon and the balancing weight assembly are loaded on a ship, transported to an offshore construction site and prepared for installation operation;
s2, the main crane of the construction ship puts the balancing weight assembly into water;
s3, a winch rigging is put down by the construction operation ship, and the winch rigging is connected with the balancing weight assembly;
s4, a ship crane for construction operation lowers the pontoon into water, a winch recovers the balancing weight assembly to the lower part of the pontoon, the pontoon and the balancing weight assembly are connected with a transfer rigging, the crane is matched with the winch, and the weight of the balancing weight assembly is gradually transferred to the pontoon;
s5, the ship crane for construction operation integrally lowers the pontoon and the balancing weight assembly to a target position of the seabed, and the hook head rigging of the crane is released to complete pontoon installation;
s6, completing cable joint assembly of the anchor chain and the pontoon under water, disconnecting a rigging between the pontoon and the balancing weight assembly, and enabling the pontoon to carry the anchor legs to float upwards;
s7, the ship crane for construction operation lowers the rigging, and the balancing weight assembly is recovered.
As the preferable technical scheme of the invention, the balancing weight assembly comprises an external frame and an internal frame, wherein the internal frame is arranged in the external frame, the external frame and the internal frame are limited and fixed through positioning pins, four uniformly distributed first lifting lugs are arranged on the top surface of a bottom plate of the external frame, and four uniformly distributed second lifting lugs are arranged on the top surface of a top plate of the internal frame.
As a preferable technical scheme of the invention, the external frame and the internal frame are respectively provided with a set of hoisting rigging, one set of hoisting rigging is connected with the first lifting lug, and the other set of hoisting rigging is connected with the second lifting lug.
As a preferable technical scheme of the invention, a plurality of balancing weights are arranged in the built-in frame.
As the preferable technical scheme of the invention, the number, the size and the specification of the balancing weights are adapted to the size of the pontoon, and the balancing weights are made of steel and/or cement.
As a preferred technical solution of the present invention, in step S2, the step of lowering the weight assembly into water includes: s21, lifting the external frame by a main crane of the construction operation ship, lowering the external frame to a target position of a seabed under the support of an underwater positioning technology; s22, after the ROV releases the crane to hoist the rigging, the crane is recycled to the ship deck; s23, lifting the built-in frame by a ship main crane for construction operation, lowering the built-in frame into the external frame under the assistance of an ROV, and recovering the crane to a ship deck after lifting a rigging by the ROV; s24, installing the locating pins in four directions by the ROV, and finishing limit fixation between the external frame and the internal frame.
As the preferable technical scheme of the invention, when the anchor chain is assembled with the cable joint of the pontoon, the ship crane for construction operation firstly lifts the anchor chain, the underwater assembly of the anchor chain and the cable joint of the pontoon is completed by a diver, the ROV breaks the rigging between the pontoon and the counterweight block assembly, and the pontoon carries the anchor leg to float upwards.
As the preferable technical scheme of the invention, the pontoon and the balancing weight combination body are integrally lowered to the target position of the seabed, and the pontoon position is adapted to the hoisting reaching height of the anchor chain.
Compared with the prior art, the invention provides an underwater tie-back method for ballasting a single-point pontoon by adopting a counterweight, which has the following beneficial effects:
according to the invention, the counterweight block assembly is placed on the seabed through the construction ship main crane, the counterweight block assembly is recovered to a certain water depth by utilizing the winch to carry out temporary suspension, the construction ship main crane hoists the pontoon to the water surface, the weight of the counterweight block assembly is completely transferred to the bottom of the pontoon, the construction ship main crane integrally lowers the pontoon and the counterweight to the seabed to realize the installation of the pontoon in place, after a diver finishes the tie-back of a mooring anchor leg to the pontoon, the ROV disconnects the pontoon from the counterweight rigging, the pontoon automatically finishes floating, and the ship main crane respectively recovers the combined counterweight to a deck. The split design of the inner and outer frames of the balancing weight assembly can reduce the load requirement on the crane, when the load of the crane is small, the balancing weight assembly can be put into water by means of sectional hoisting, and construction risks are reduced. The invention does not need to install the structure on the seabed in advance, reduces the construction workload and facilitates the recovery of auxiliary installation equipment.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic view of an external frame hoist according to the present invention;
FIG. 3 is a schematic view of the present invention in-frame lifting;
FIG. 4 is a schematic view of the assembly of the present invention;
FIG. 5 is a schematic illustration of the connection of the counterweight assembly and pontoon of the invention;
FIG. 6 is a schematic view of a pontoon connection anchor leg according to the invention;
fig. 7 is a schematic view of completion of shank tieback in accordance with the present invention.
1 is a balancing weight assembly, 2 is a pontoon, 3 is an external frame, 4 is an internal frame, 5 is a first lifting lug, and 6 is a second lifting lug.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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 be within the scope of the invention.
Referring to fig. 1-7, an embodiment of the present invention provides an underwater tie-back method for ballasting a single-point buoy by using a counterweight, comprising the following steps:
s1, a land prefabricated balancing weight assembly 1, a pontoon 2 and the balancing weight assembly 1 are loaded on a ship, transported to an offshore construction site, and prepared for installation operation;
s2, the main crane of the construction ship puts the balancing weight assembly 1 into water;
s3, a winch rigging is put down by the construction operation ship, and the winch rigging is connected with the balancing weight assembly 1;
s4, a construction operation ship crane lowers the pontoon 2 into water, a winch recovers the balancing weight assembly 1 to the lower part of the pontoon 2, the pontoon 2 and the balancing weight assembly 1 are connected with a switching rigging, the crane is matched with the winch, and the weight of the balancing weight assembly 1 is gradually transferred to the pontoon 2;
s5, the ship crane for construction operation integrally lowers the pontoon 2 and the balancing weight assembly 1 to a target position of the seabed, and removes a hook head rigging of the crane to complete installation of the pontoon 2;
s6, finishing the cable joint assembly of the anchor chain and the pontoon 2 underwater, disconnecting a rigging between the pontoon 2 and the counterweight block assembly 1, wherein the pontoon 2 carries the anchor legs to float upwards;
s7, a ship crane for construction operation lowers the rigging and recovers the balancing weight assembly 1.
In one embodiment of the present invention, the counterweight assembly 1 includes an external frame 3 and an internal frame 4, the internal frame 4 is installed in the external frame 3, the external frame 3 and the internal frame 4 are fixed in a limiting manner by positioning pins, four uniformly distributed first lifting lugs 5 are disposed on the top surface of the bottom plate of the external frame 3, and four uniformly distributed second lifting lugs 6 are disposed on the top surface of the top plate of the internal frame 4.
In one embodiment of the invention, the external frame 3 and the internal frame 4 are each provided with a set of hoisting rigging, one set of hoisting rigging being connected to the first lifting lug 5 and the other set of hoisting rigging being connected to the second lifting lug 6.
In one embodiment of the present invention, a plurality of weights are disposed in the built-in frame 4.
In one embodiment of the invention, the number, size and specification of the balancing weights are adapted to the size of the pontoon 2, and the balancing weights are made of steel and/or cement.
In one embodiment of the present invention, in step S2, the step of lowering the weight assembly 1 into water includes: s21, lifting the external frame 3 by a main crane of a construction operation ship, lowering the external frame 3 to a target position of a seabed under the support of an underwater positioning technology; s22, after the ROV releases the crane to hoist the rigging, the crane is recycled to the ship deck; s23, lifting the built-in frame 4 by a ship main crane for construction operation, lowering the built-in frame 4 into the external frame 3 under the assistance of an ROV, and recovering the crane to a ship deck after lifting a rigging by the ROV; s24, the ROV is provided with the positioning pins in four directions, and limiting and fixing between the external frame 3 and the internal frame 4 are completed.
In one embodiment of the invention, when the anchor chain is paired with the rope joint of the pontoon 2, the construction ship crane firstly lifts the anchor chain, the diver finishes the pairing of the anchor chain and the rope joint of the pontoon 2 under water, the ROV disconnects the rigging between the pontoon 2 and the counterweight block assembly 1, and the pontoon 2 carries the anchor leg to float.
In one embodiment of the invention, the pontoon 2 and the counterweight assembly 1 are integrally lowered to a target position on the seabed, and the pontoon 2 is positioned to be suitable for the hoisting of the anchor chain to the height.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.
Claims (8)
1. An underwater tieback method for a single-point pontoon ballasted by a counterweight is characterized by comprising the following steps:
s1, a land prefabricated balancing weight assembly (1), loading a pontoon (2) and the balancing weight assembly (1) into a ship, transporting to an offshore construction site, and preparing for installation operation;
s2, the main crane of the construction ship puts the balancing weight assembly (1) into water;
s3, a winch rigging is put down by the construction operation ship, and the winch rigging is connected with the balancing weight assembly (1);
s4, a construction operation ship crane drops the pontoon (2) into water, a winch recovers the balancing weight assembly (1) to the lower part of the pontoon (2), the pontoon (2) is connected with the balancing weight assembly (1) through a switching rigging, and the crane is matched with the winch to gradually transfer the weight of the balancing weight assembly (1) to the pontoon (2);
s5, the ship crane for construction operation integrally lowers the pontoon (2) and the balancing weight assembly (1) to a target position of the seabed, and the hook head rigging of the crane is released to finish the installation of the pontoon (2);
s6, finishing cable joint group pairing of the anchor chain and the pontoon (2) underwater, disconnecting a rigging between the pontoon (2) and the balancing weight assembly (1), and enabling the pontoon (2) to carry the anchor legs to float upwards;
s7, a ship crane for construction operation lowers the rigging and recovers the balancing weight assembly (1).
2. The underwater tieback method of a single point pontoon ballasted with a counterweight of claim 1, wherein:
the balancing weight assembly (1) comprises an external frame (3) and an internal frame (4), wherein the internal frame (4) is installed in the external frame (3), the external frame (3) and the internal frame (4) are fixed in a limiting mode through positioning pins, four evenly distributed first lifting lugs (5) are arranged on the top surface of a bottom plate of the external frame (3), and four evenly distributed second lifting lugs (6) are arranged on the top surface of a top plate of the internal frame (4).
3. The underwater tieback method of a single point pontoon ballasted with a counterweight of claim 2, wherein:
the external frame (3) and the internal frame (4) are respectively provided with a set of hoisting rigging, one set of hoisting rigging is connected with the first lifting lug (5), and the other set of hoisting rigging is connected with the second lifting lug (6).
4. The underwater tieback method of a single point pontoon ballasted with a counterweight of claim 2, wherein:
a plurality of balancing weights are arranged in the built-in frame (4).
5. The underwater tieback method of a single point pontoon ballasted with a counterweight of claim 4, wherein:
the number, the size and the specification of the balancing weights are adapted to the size of the pontoon (2), and the balancing weights are made of steel and/or cement.
6. The underwater tieback method of a single point pontoon ballasted with a counterweight of claim 2, wherein:
in step S2, the step of lowering the balancing weight assembly (1) into water includes: s21, lifting the external frame (3) by a main crane of a construction operation ship, lowering the external frame (3) to a seabed target position under the support of an underwater positioning technology; s22, after the ROV releases the crane to hoist the rigging, the crane is recycled to the ship deck; s23, lifting the built-in frame (4) by a main crane of the construction operation ship, putting the built-in frame (4) into water, under the assistance of an ROV, putting the built-in frame (4) into the external frame (3), and recovering the crane to a ship deck after lifting a rigging by the ROV; s24, the ROV is provided with four positioning pins in the four directions, and limiting and fixing between the external frame (3) and the internal frame (4) are completed.
7. The underwater tieback method of a single point pontoon ballasted with a counterweight of claim 1, wherein:
the anchor chain is paired with the cable joint of the pontoon (2), the anchor chain is hoisted by the ship crane for construction operation, the pairing of the anchor chain and the cable joint of the pontoon (2) is completed under water by a diver, the ROV breaks a rigging between the pontoon (2) and the balancing weight assembly (1), and the pontoon (2) carries the anchor leg to float upwards.
8. The underwater tieback method of a single point pontoon ballasted with a counterweight of claim 7, wherein:
the pontoon (2) and the balancing weight assembly (1) are integrally lowered to a target position of the seabed, and the position of the pontoon (2) is adapted to the hoisting reaching height of the anchor chain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311472048.8A CN117698909A (en) | 2023-11-07 | 2023-11-07 | Underwater tie-back method for single-point pontoon ballasted by adopting counterweight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311472048.8A CN117698909A (en) | 2023-11-07 | 2023-11-07 | Underwater tie-back method for single-point pontoon ballasted by adopting counterweight |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117698909A true CN117698909A (en) | 2024-03-15 |
Family
ID=90150439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311472048.8A Pending CN117698909A (en) | 2023-11-07 | 2023-11-07 | Underwater tie-back method for single-point pontoon ballasted by adopting counterweight |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117698909A (en) |
-
2023
- 2023-11-07 CN CN202311472048.8A patent/CN117698909A/en active Pending
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