A buoyant lift method for jacket installation

Abstract

The application discloses a pontoon lifting type jacket installation method and belongs to the technical field of jacket installation. The method comprises the following steps: S1, installing a jacket and a pontoon on a semi-submersible barge and fixing the jacket and the pontoon; S2, towing the semi-submersible barge to a construction area by a main tug; S3, anchoring a ship group in position, and connecting the jacket to winches of a floating crane ship and the semi-submersible barge; S4, submerging the semi-submersible barge to a specified position, and making the jacket self-float; S5, making the jacket leave the semi-submersible barge, controlling the position of the jacket, and moving the jacket to a designed target position; S6, slowly sinking the jacket in the pontoon floating state until the jacket sinks to the bottom; and S7, after the jacket sinks to the bottom, the floating crane ship completes the recovery of the pontoon. The technical core of the pontoon lifting type jacket installation method is to provide controllable buoyancy through modular pontoon clusters, to realize the crane-free auxiliary installation of a super-large jacket, and to have the technical advantages of the method, compared with a traditional floating crane hoisting process, and to avoid the idle loss of a floating crane ship dock.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of pontoon lifting type jacket installation method, which belongs to jacket installation technical field. BACKGROUND

[0002] Jacket installation is the first link of offshore platform installation, and the traditional jacket is mostly installed by large floating crane, but with the growth of various offshore platform tonnage, the floating crane that can meet the lifting requirements is less and less, and the floating crane has the problems of high cost and low operation efficiency. Therefore, it is necessary to design a pontoon lifting type jacket installation method. SUMMARY

[0003] The present application provides a kind of pontoon lifting type jacket installation method to solve the above technical problems.

[0004] The technical scheme for solving the above technical problems of the present application is as follows:

[0005] A kind of pontoon lifting type jacket installation method, comprising the following steps:

[0006] Step S1, the jacket is rolled onto the semi-submersible barge by the slide or the shaft line, and then the floating crane is used to install the several pontoons on the semi-submersible barge at the rolling wharf, the several pontoons on one side of the semi-submersible barge are installed in place first, then the semi-submersible barge is turned around, and the several pontoons on the other side are installed in place, and the pontoons are further connected and fixed with the jacket after being installed in place;

[0007] Step S2, after the installation of the pontoons is completed, the jacket and the pontoons are towed by the main tug to the semi-submersible barge to the construction area;

[0008] Step S3, after the jacket is transported to the construction area, the floating crane is anchored in place, the semi-submersible barge is anchored in place near the floating crane, and the jacket is connected to the winch of the floating crane and the semi-submersible barge by the cable;

[0009] Step S4, after the ship group is anchored in place, the semi-submersible barge is submerged to the specified depth, and the buoyancy generated by the pontoons plus the internal buoyancy of the jacket makes the jacket leave the deck of the semi-submersible barge, so that the jacket is completely self-floating;

[0010] Step S5, after the jacket leaves the semi-submersible barge, the position of the jacket is controlled by the winches on the semi-submersible barge and the floating crane, and the jacket is accurately moved to the designed target position;

[0011] Step S6, after the jacket is moved to the installation position, the jacket slowly sinks under the positive floating state of the pontoons until the jacket sinks to the bottom;

[0012] Step S7, after the jacket sinks to the bottom, the floating crane completes the recovery of the pontoons.

[0013] Furthermore, each of the four corners of the pontoon is symmetrically equipped with guide wheels, and a jack is provided on the diagonal of the pontoon inside each guide wheel. Each jack is equipped with a main lifting cable.

[0014] Furthermore, in step S1, the connection and fixing of the pontoon and the guide frame specifically involves fixing the first end of the main lifting cable of the jacks on the top of several pontoons to the corresponding jacks, passing the middle end through the corresponding guide wheel, and connecting the tail end to the lifting point near the bottom of the guide frame. The lifting point is the connection position between the bottom crossbeam and the vertical beam or the crossbeam and the fixed beam of the guide frame. After the connection is completed, the jacks tighten the main lifting cable with force to achieve the binding and stabilization of the pontoons.

[0015] Furthermore, in step S4, during the process of achieving complete self-floating of the jacket, the jacks on several pontoons are simultaneously controlled to raise and lower the main lifting cable so that the jacket is in a basically horizontal state.

[0016] Furthermore, in step S6, after the jacket is moved to the installation position, the jacks on several pontoons are simultaneously controlled to lower the main lifting cables, so that the jacket slowly sinks in the floating state of the pontoons until the jacket sinks to the bottom.

[0017] Furthermore, several of the aforementioned pontoons are symmetrically arranged on the jacket.

[0018] Furthermore, the guide frame is equipped with several pressure sensors and height sensors for measuring the real-time draft and height of the guide tube above the ground.

[0019] Furthermore, in step S4, after the semi-submersible barge submerges to the specified depth, the total buoyancy of all pontoons must meet the self-floating requirement of the jacket structure.

[0020] Furthermore, in step S4, after the jacket structure is fully self-floating, there is a safety gap of at least three meters between it and the semi-submersible barge.

[0021] Furthermore, the jacks complete the raising and lowering of the main lifting cable through clamping cylinders and lifting cylinders. Each float is equipped with a power station and a generator. The generator provides electrical energy to the power station, and the power station provides a high-pressure hydraulic power source for the jacks.

[0022] The beneficial effects of this invention are: the core of the floating box lifting jacket installation technology lies in providing controllable buoyancy through modular floating box clusters, realizing the installation of ultra-large jackets without crane assistance. Compared with the traditional floating crane lifting process, its technical advantages are significant, and it avoids the idle loss of floating cranes during the dock period.

[0023] Significant cost advantages: This technology can operate without the use of ultra-large floating cranes (lifting capacity of 10,000 tons or more), effectively solving the current situation of extreme scarcity of ultra-large floating cranes in China. Compared with the dispatch and construction of floating cranes, all resources of this invention can be reused, and costs are greatly reduced.

[0024] Breaking through the limits of load-bearing capacity: Through the array combination of floating boxes, a single system can achieve a buoyancy output of more than 10,000 tons, breaking through the existing 5,000-ton lifting limit of floating cranes;

[0025] Higher installation accuracy: The lifting mode of the multi-floating box can effectively adjust the level of the jacket, effectively improve the installation level of the jacket, and reduce the risk factor of the jacket in place.

[0026] Higher safety: In terms of installation safety, the multi-float box has a larger free liquid surface, which can effectively solve the disadvantage of the small free liquid surface of the jacket. After floating, the whole system has higher stability and improves the safety of the whole system.

[0027] Excellent operational flexibility: The arrangement and commissioning of the pontoons are relatively flexible. The number and position of the pontoons can be adjusted flexibly according to the structural characteristics of the jacket and the installation requirements, thereby improving the convenience of the installation operation.

[0028] Easy maintenance: The floating box has a simple structure, is easy to inspect and repair, and can be replaced individually if damaged, without affecting the normal operation of the overall system, thus reducing maintenance costs and difficulty;

[0029] In the installation of converter station jackets, this technical solution demonstrates unique adaptability. As the load-bearing foundation for high-voltage equipment, the converter station jacket has very high verticality tolerance requirements. The pontoon system achieves millimeter-level attitude correction by setting up distributed pressure sensors for real-time feedback and combining them with hydraulic leveling devices. With the increasing trend of marine engineering equipment becoming larger, this technology is developing towards intelligence. Through intelligent algorithms, the buoyancy distribution algorithm can be further optimized, providing a more efficient solution for the installation of ultra-large marine structures. It can be widely promoted and applied in the field of jacket sinking technology in offshore platform installation operations. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the pontoon installation according to the present invention.

[0031] Figure 2 This is a schematic diagram of the transportation of the guide frame according to the present invention.

[0032] Figure 3 This is a schematic diagram of the jacketed frame with cables after the ship assembly of the present invention is in place.

[0033] Figure 4 for Figure 3A schematic diagram of the middle guide frame after cable adjustment.

[0034] Figure 5 This is a schematic diagram of the catheter holder being lowered into place according to the present invention.

[0035] Figure 6 This is a schematic diagram showing the completion of the placement of the guide frame according to the present invention.

[0036] Figure 7 This is a schematic diagram of the floating box structure of the present invention.

[0037] Figure 8 This is a schematic diagram of the lifting point structure of the catheter holder according to the present invention.

[0038] In the diagram: 1. Floating crane vessel; 2. Main tugboat; 3. Main lifting cable; 4. Floating box; 5. Jacket; 51. Lifting point; 6. Semi-submersible barge; 7. Cable; 8. Mooring cable; 9. Guide wheel; 10. Jack; 11. Power station; 12. Generator. Detailed Implementation

[0039] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0040] like Figures 1-8 As shown, the installation method of the floating box type jacket includes the following steps:

[0041] Step S1: The jacket 5 is rolled onto the semi-submersible barge 6 by a slideway or axle vehicle. Then, at the roll-on / roll-off terminal, a number of pontoons 4 are installed onto the semi-submersible barge 6 by a floating crane 1. First, a number of pontoons 4 on one side of the semi-submersible barge 6 are installed. Then, the semi-submersible barge 6 turns around and installs a number of pontoons 4 on the other side. After all the pontoons 4 are installed, the pontoons 4 are further connected and fixed to the jacket 5.

[0042] Step S2: After the pontoon 4 is installed, the jacket frame 5 and the pontoon 4 are towed by the main tugboat 2 to the semi-submersible barge 6 to the construction area.

[0043] Step S3: After the jacket 5 is transported to the construction area, the floating crane 1 is anchored and positioned, and the semi-submersible barge 6 is anchored near the floating crane 1. The jacket 5 is then connected to the winches of the floating crane 1 and the semi-submersible barge 6 by the cable 7.

[0044] After step S4, when the floating crane 1 and the semi-submersible barge 6 are in place, the semi-submersible barge 6 submerges to the designated depth. The buoyancy generated by the buoy 4 plus the internal buoyancy of the jacket 5 causes the jacket 5 to leave the deck of the semi-submersible barge 6, thereby achieving complete self-floating of the jacket 5.

[0045] Step S5: After the jacket 5 leaves the semi-submersible barge 6, the position of the jacket 5 is controlled by the winch on the semi-submersible barge 6 and the floating crane 1, and the jacket 5 is precisely moved to the design target position.

[0046] Step S6: After the jacket 5 is moved to the installation position, the jacket 5 slowly sinks in the floating box 4 in a positive floating state until the jacket 5 sinks to the bottom.

[0047] In step S7, after the jacket 5 sinks to the bottom, the floating crane 1 completes the recovery of the pontoon 4.

[0048] Each of the four corners of the pontoon 4 is symmetrically provided with guide wheels 9, and jacks 10 are provided on the diagonal line of the pontoon 4 inside each guide wheel 9. Each jack 10 is provided with a main lifting cable 3 inside.

[0049] In step S1, the connection and fixing of the pontoon 4 and the guide frame 5 specifically involves fixing the first end of the main lifting cable 3 of the jacks 10 at the top of several pontoons 4 to the corresponding jacks 10, passing the middle end through the corresponding guide wheel 9, and connecting the tail end to the lifting point 51 near the bottom of the guide frame 5 (e.g., Figure 8 As shown), lifting point 51 is the connection position between the bottom crossbeam and the vertical beam or the crossbeam and the fixed beam of the guide frame 5. After the connection is completed, the jack 10 tightens the main lifting cable 3 with force to realize the binding and stabilization of the float box 4.

[0050] In step S4, during the process of achieving complete self-floating of the jacket 5, the jacks 10 on several float boxes 4 are simultaneously controlled to raise and lower the main lifting cable 3 so that the jacket 5 is in a basically horizontal state.

[0051] In step S6, after the jacket frame 5 is moved to the installation position, the jacks 10 on several pontoons 4 are simultaneously controlled to lower the main lifting cables 3, so that the jacket frame 5 slowly sinks in the floating state of the pontoons 4 until the jacket frame 5 sinks to the bottom.

[0052] Several of the aforementioned buoys 4 are symmetrically arranged on the jacket 5 to ensure that the jacket 5 is in a positive floating state.

[0053] The guide frame 5 is equipped with several pressure sensors and height sensors to measure the real-time draft and height of the guide tube above the ground.

[0054] In step S4, after the semi-submersible barge 6 submerges to the specified depth, the total buoyancy of all pontoons 4 must meet the self-buoyancy requirement of the jacket 5.

[0055] In step S4, after the jacket 5 is fully self-floating, there is a safety gap of at least three meters between it and the semi-submersible barge 6.

[0056] The jack 10 completes the raising and lowering of the main lifting cable 3 through the clamping cylinder and the lifting cylinder. Each float box 4 is equipped with a power station 11 and a generator 12. The generator 12 provides electrical energy to the power station 11, and the power station 11 provides a high-pressure hydraulic power source for the jack 10.

[0057] During work, with attachment Figure 8 Taking the example of four jacket supports 5 and four pontoons 4, each pontoon 4 has four guide wheels 9 symmetrically positioned at its four corners, each guide wheel 9 has a corresponding jack 10 inside, and each jack 10 has a main lifting cable 3 inside. The specific steps include the following:

[0058] Step S1: The jacket 5 is rolled onto the semi-submersible barge 6 via a slideway or axle vehicle. Then, at the roll-on / roll-off terminal, the floating crane 1 installs the pontoons 4 onto the semi-submersible barge 6. First, the two pontoons 4 on one side of the semi-submersible barge 6 are installed. Then, the semi-submersible barge 6 turns around and installs the two pontoons 4 on the other side. After all the pontoons 4 are installed, the main lifting cables 3 of the four jacks 10 on the top of the pontoons 4 are connected to the lifting point 51 at the bottom of the jacket 5. After the connection is completed, each jack 10 tightens the main lifting cable 3 to secure the pontoons 4.

[0059] Step S2: After the pontoon 4 is installed, the jacket frame 5 is transported using the main tugboat 2;

[0060] Step S3: After the jacket 5 is transported to the construction area, the floating crane 1 is anchored and positioned, and the semi-submersible barge 6 is anchored and positioned near the floating crane 1. The jacket 5 is connected to the winches of the floating crane 1 and the semi-submersible barge 6 by the cable 7. The mooring cable 8 is used to anchor and fix the floating crane 1 or the semi-submersible barge 6 itself.

[0061] Step S4: After the vessel group is in place, the semi-submersible barge 6 submerges to the designated depth. The buoyancy generated by the buoy 4 plus the internal buoyancy of the jacket 5 causes the jacket 5 to leave the deck of the semi-submersible barge 6, thereby achieving complete self-floating of the jacket 5. At the same time, the jacks 10 on all the buoy 4 are controlled to raise and lower the main lifting cable 3 so that the jacket 5 is completely horizontal.

[0062] In step S5, after the jacket 5 leaves the semi-submersible barge 6, the position of the jacket 5 is controlled by the winches on the semi-submersible barge 6 and the floating crane 1, and the jacket 5 is accurately moved to the design target position with an absolute position error within 1m.

[0063] Step S6: After the jacket frame 5 is towed to the installation position, the jacks 10 on the pontoon 4 are simultaneously controlled to lower the main lifting cable 3, so that the pontoon slowly sinks in a positive floating state until the jacket frame sinks to the bottom.

[0064] In step S7, after the jacket 5 sinks to the bottom, the floating crane 1 completes the recovery of the pontoon 4.

[0065] The core technology of this patent application lies in providing controllable buoyancy through a cluster of modular floating boxes 4, enabling crane-free installation of ultra-large jacket foundation 5. Compared to traditional floating crane lifting processes, its technological advantages are significant, and it avoids the idle losses of the floating crane vessel 1 during docking. It also offers significant cost advantages: this technology can operate without the need for ultra-large floating cranes (lifting capacity of 10,000 tons or more), effectively solving the current situation of extreme scarcity of ultra-large floating cranes in China. Compared to the dispatch and construction of floating cranes, all resources of this invention can be reused, significantly reducing costs. It breaks through the limits of load-bearing capacity: through the array combination of floating boxes 4, a single system can achieve a buoyancy output of over 10,000 tons, breaking through the existing 5,000-ton lifting limit of floating cranes. Furthermore, it achieves higher installation precision: through the lifting mechanism of multiple floating boxes 4... This design effectively adjusts the levelness of the jacket support 5, improving its installation level and reducing the risk factor of the jacket support 5 in its in-situ state; it offers higher safety: in terms of installation safety, the multi-floating box 4 has a larger free surface area, effectively solving the problem of the small free surface area of ​​the jacket support 5. After self-floating, the entire system has higher stability, improving the overall system safety; it offers excellent operational flexibility: the arrangement and commissioning of the floating boxes 4 are relatively flexible, and the number and position of the floating boxes 4 can be flexibly adjusted according to the structural characteristics and installation requirements of the jacket support 5, improving the convenience of installation operations; and it facilitates later maintenance: the floating box 4 has a simple structure, is easy to inspect and repair, and can be replaced individually if damaged, without affecting the normal operation of the overall system, reducing maintenance costs and difficulty;

[0066] In the installation scenario of converter station jacket 5, this technical solution demonstrates unique adaptability. As the load-bearing foundation of high-voltage equipment, converter station jacket 5 has very high verticality tolerance requirements. The float box 4 system achieves millimeter-level attitude correction by setting up distributed pressure sensors for real-time feedback and combining hydraulic leveling devices. With the increasing trend of marine engineering equipment becoming larger, this technology is developing towards intelligence. Through intelligent algorithms, the buoyancy distribution algorithm can be further optimized, providing a more efficient solution for the installation of ultra-large marine structures. It can be widely promoted and applied in the field of jacket 5 sinking technology in offshore platform installation operations.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for installing a floating box-type jacket support, characterized in that, Includes the following steps: Step S1: The jacket (5) is rolled onto the semi-submersible barge (6) by a slideway or axle vehicle. Then, at the roll-on / roll-off terminal, a floating crane (1) installs several pontoons (4) onto the semi-submersible barge (6). First, several pontoons (4) on one side of the semi-submersible barge (6) are installed. Then, the semi-submersible barge (6) turns around, and several pontoons (4) on the other side are installed. After all the pontoons (4) are installed, they are further connected and fixed to the jacket (5). Each pontoon (4) has guide wheels (9) symmetrically arranged at its four corners. Each guide wheel (9) has a jack (10) on the diagonal of the pontoon (4) inside it. Each jack (10) has a main lifting cable (3) inside. The connection and fixation between the float (4) and the guide frame (5) is as follows: the first end of the main lifting cable (3) of the jack (10) at the top of several floats (4) is fixed on the corresponding jack (10), the middle end passes through the corresponding guide wheel (9), and the tail end is connected to the lifting point (51) near the bottom of the guide frame (5). The lifting point (51) is the connection position between the bottom crossbeam and the vertical beam or the crossbeam and the fixed beam of the guide frame (5). After the connection is completed, the jack (10) tightens the main lifting cable (3) with force to realize the binding and stabilization of the float (4), thereby realizing the transmission of buoyancy. After step S2 and the installation of the pontoon (4) are completed, the jacket frame (5) and the pontoon (4) are towed by the main tugboat (2) to the semi-submersible barge (6) to the construction area. Step S3: After the jacket (5) is transported to the construction area, the floating crane (1) is anchored and the semi-submersible barge (6) is anchored near the floating crane (1). The jacket (5) is then connected to the winches of the floating crane (1) and the semi-submersible barge (6) by cables (7). After step S4, the floating crane (1) and the semi-submersible barge (6) are in place, the semi-submersible barge (6) dives to the specified depth. The buoyancy generated by the pontoon (4) plus the internal buoyancy of the jacket (5) causes the jacket (5) to leave the deck of the semi-submersible barge (6), thereby achieving complete self-floating of the jacket (5). During the process of achieving complete self-floating of the jacket (5), the jacks (10) on several pontoons (4) are simultaneously controlled to raise and lower the main lifting cable (3) so that the jacket (5) is in a horizontal state. Step S5: After the jacket (5) leaves the semi-submersible barge (6), the position of the jacket (5) is controlled by the winch on the semi-submersible barge (6) and the floating crane (1), and the jacket (5) is precisely moved to the design target position. Step S6: After the jacket (5) is moved to the installation position, the jacks (10) on several pontoons (4) are simultaneously controlled to lower the main lifting cables (3) in a coordinated manner, so that the jacket (5) slowly sinks in the positive floating state of the pontoons (4) until the jacket (5) sinks to the bottom. Step S7: After the jacket (5) sinks to the bottom, the floating crane (1) completes the recovery of the pontoon (4).

2. The method for installing a floating box-type jacket according to claim 1, characterized in that, Several of the aforementioned pontoons (4) are symmetrically arranged on the jacket (5).

3. The method for installing a floating box type jacket according to claim 1, characterized in that: The guide frame (5) is equipped with several pressure sensors and height sensors to measure the real-time draft and height of the guide frame above the ground.

4. The method for installing a floating box type jacket according to claim 1, characterized in that, In step S4, after the semi-submersible barge (6) submerges to the specified depth, the total buoyancy of all pontoons (4) must meet the self-floating requirement of the jacket (5).

5. The method for installing a floating box type jacket according to claim 1, characterized in that, In step S4, after the jacket (5) is fully self-floating, there is a safety gap of at least three meters between it and the semi-submersible barge (6).

6. The method for installing a floating box-type jacket according to claim 1, characterized in that, The jack (10) completes the raising and lowering of the main lifting cable (3) through the clamping cylinder and the lifting cylinder. Each of the float boxes (4) is equipped with a power station (11) and a generator (12). The generator (12) provides electrical energy to the power station (11), and the power station (11) provides a high-pressure hydraulic power source for the jack (10).

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