Construction method for connecting offshore booster station foundation jacket and upper component

Abstract

The invention discloses a construction method for connecting a foundation jacket and an upper component of an offshore booster station, which comprises the following steps of: mounting a guide rail on a transport ship, and respectively stopping the transport ship and a crane ship on two sides of the jacket, so that the sliding tracks of the transport ship, the jacket, the crane ship and the upper component are positioned on the same straight line; then a traction rope of traction equipment is wound around a guide wheel of the jacket, then wound around the rear transport ship and connected with the upper assembly, the traction equipment is used for moving the upper assembly to the head position of the transport ship so as to be close to the jacket, and then the crane ship is used for hoisting the upper assembly and linearly moving the upper assembly in the direction of the guide frame; therefore, the hoisting path of the upper assembly in the air is shortened to the maximum extent, the traction equipment continues to wind, the traction rope is always kept in a tightened state until the upper assembly is hoisted to the jacket, finally, the jacket and the upper assembly are connected, and the construction efficiency and safety are improved.

Description

Technical Field

[0001] The present application relates to the field of offshore wind farm construction, and in particular to a construction method for connecting a foundation conductor frame of an offshore booster station with an upper component. Background Art

[0002] At present, in the construction of offshore wind farms, the booster station plays a vital role as a key node of power transmission. The foundation conductor frame is the main supporting structure of the offshore booster station. The upper components mainly include steel structure frames and interlayer equipment rooms. The interlayer equipment rooms are used to install and accommodate various electrical equipment of the booster station. In order to meet the operation and maintenance needs of offshore wind farms, the upper components usually also include a helicopter platform. This platform can be used for helicopter takeoff and landing, making it convenient for operation and maintenance personnel to quickly reach the booster station for on-site operations. The steel structure frame is mainly used to support the fixed interlayer equipment room and the aircraft platform.

[0003] In the related art, an overall lifting method is usually adopted, in which a crane ship is used to lift the upper components on the transport ship, and transfer them to the top of the foundation conductor frame, and then slowly lower them to complete the connection between the upper components and the conductor frame. During the connection process, it is necessary to ensure that the main support column at the bottom of the upper component and the main leg at the top of the conductor frame can be accurately connected. However, in the actual overall lifting and installation process at sea, due to the objective factors of the open sea terrain, the lifting process is greatly affected by natural environments such as strong winds, monsoons, waves, and fog. It is difficult to maintain the stability of the upper components during the lifting process, resulting in reduced construction efficiency and greater construction risks. Safety is difficult to guarantee, so there is still room for improvement. Summary of the invention

[0004] In order to improve construction efficiency and safety, the present application provides a construction method for connecting a foundation conductor frame and upper components of an offshore booster station.

[0005] The present application provides a construction method for connecting the foundation jacket and upper components of an offshore booster station using the following technical solution: A construction method for connecting a foundation jacket and an upper assembly of an offshore booster station comprises the following steps: Transportation preparation: Install two guide rails on the transport ship, which are symmetrically distributed on both sides of the transport ship and extend along the length of the transport ship, install sliding frames on the guide rails, and then place the upper component rack on the sliding frames; install the traction equipment at the stern of the transport ship; Preparation for lifting: The transport ship and the crane ship travel to the front and rear sides of the jacket respectively, and install guide wheels on the jacket. Then, the connecting end of the traction rope of the traction equipment is pulled to the head of the transport ship, and then the connecting end of the traction rope is wound around the guide wheel on the side of the jacket and then wound back to the transport ship. Then, the connecting end of the traction rope is connected to the upper assembly, and then the traction equipment is started. The upper assembly moves to the head of the transport ship under the cooperation of the traction rope and the guide wheel; Lifting construction: Connect the lifting equipment of the crane ship to the upper component, lift the upper component through the crane ship, and start the traction equipment at the same time to keep the traction rope taut until the upper component is lifted onto the conductor rack and the connection operation between the conductor rack and the upper component is completed.

[0006] By adopting the above technical scheme, guide rails are installed on the transport ship, and the transport ship and the crane ship are docked on both sides of the conductor frame respectively, so that the sliding tracks of the transport ship, the conductor frame, the crane ship and the upper component are in the same straight line, and then the traction rope of the traction equipment is wrapped around the guide wheel of the conductor frame and then wrapped around the rear transport ship and connected with the upper component, and by utilizing the traction effect of the traction equipment and the guiding effect of the guide wheel, the upper component can be first moved to the head position of the transport ship, so as to be close to the conductor frame, and then the crane ship is used to lift the upper component and move it in a straight line toward the guide frame, so as to shorten the lifting path of the upper component in the air to the greatest extent. At this time, the traction equipment continues to be reeled in, so that the traction rope is always kept in a taut state, which improves the wind resistance of the upper component during the lifting and transfer process, until the upper component is lifted onto the conductor frame, and finally the connection operation of the conductor frame and the upper component is completed, which is conducive to improving construction efficiency and safety.

[0007] Preferably, an air bag is provided at the head of the transport ship, and when the transport ship moves to one side of the catheter rack, the air bag contacts the catheter rack.

[0008] By adopting the above technical solution, the airbag plays an anti-collision role, allowing the transport ship to get as close to the jacket as possible and keeping a safe distance between the transport ship and the jacket, which is conducive to improving construction safety.

[0009] Preferably, in the lifting preparation step, when the transport ship approaches the conductor frame, the speed of travel is gradually slowed down, and the airbag is inflated at the same time. The airbag expands and the bottom sinks into the water. When the airbag abuts against the side of the conductor frame, the airbag forms an installation platform between the conductor frame and the transport ship, and then the guide wheel installation step and the traction rope winding step of the traction equipment are completed on the airbag.

[0010] By adopting the above technical scheme, the airbag not only plays a buffering and anti-collision role during the docking of the transport ship, but also serves as an installation platform, so that construction workers can carry out the guide wheel installation steps and the towing rope winding steps of the towing equipment, which is conducive to the smooth pulling work of the upper component. In addition, when the upper component moves from the middle of the transport ship to the head of the transport ship, the transport ship has a tendency to tilt forward under the heavy pressure of the upper component. The airbag sinks to the bottom and increases the buoyancy of the head position of the transport ship, which is conducive to reducing the risk of tipping forward of the transport ship and allowing the transport ship to reach a balanced state.

[0011] Preferably, there are two traction devices and two guide wheels, the two guide wheels correspond to the traction ropes of the two traction devices respectively, the two guide wheels are disposed on the left and right sides of the conductor frame, the distance between the two traction devices is equal to the distance between the left and right sides of the conductor frame, and when the crane vessel lifts the upper component to the top of the conductor frame, the connecting end of the traction rope is vertically arranged.

[0012] By adopting the above technical solution, two traction devices and two guide wheels are set up, each guide wheel corresponds to a traction rope of the traction device, and the two guide wheels are respectively located on the left and right sides of the conductor frame, ensuring that the traction rope always remains in a vertical state during the lifting process, thereby effectively balancing the force on the upper components during the lifting process, avoiding tilting or swinging problems caused by uneven force at a single point, thereby significantly improving the safety and stability of construction.

[0013] Preferably, acceleration sensors are installed under the several support columns of the upper component, and the acceleration sensors are used to detect the vertical acceleration and horizontal acceleration of the upper component during transportation and lifting.

[0014] By adopting the above technical solution, the acceleration sensor can monitor the vertical acceleration and horizontal acceleration of the upper components during transportation and lifting in real time, which helps to promptly detect and deal with possible abnormal situations and improve the safety and reliability of construction.

[0015] Preferably, inclinometers are installed on the top ends of several support columns of the upper component, and the inclinometers are used to detect the lateral inclination value and the longitudinal inclination value of the upper component during transportation and lifting.

[0016] By adopting the above technical solution, the installation of inclinometers can monitor the lateral and longitudinal tilt of the upper components in real time during transportation and hoisting. This helps to timely discover and correct deviations that may be caused by factors such as wind and waves, ensure the safety and accuracy of the construction process, and effectively prevent equipment damage or safety accidents caused by excessive tilt.

[0017] Preferably, when the crane vessel lifts the upper component, the horizontal distance between the upper component and the lifting equipment of the crane vessel is 7 m, and the distance from the bottom of the upper component to the sea level is 15 m.

[0018] By adopting the above technical solution, the horizontal distance between the upper component and the lifting equipment of the crane ship is 7m, which effectively avoids the safety hazards and operational inconvenience caused by too close or too far distance during the lifting process, and improves the safety and accuracy of the lifting. The distance from the bottom of the upper component to the sea level is 15m, ensuring sufficient height margin during the lifting process, preventing the risk of collision caused by factors such as waves, and further improving the safety of construction.

[0019] Preferably, after several support columns of the upper assembly are accurately placed in the corresponding main leg holes of the jacket, the welding work between the upper assembly and the jacket is completed, and then the crane ship is unhooked and evacuated, and then the upper assembly and the jacket are welded and fixed.

[0020] By adopting the above technical solution, the four columns of the upper block are correctly placed on the lower structure, and the crane ship can remove the hook and evacuate after the welding work between the upper block and the lower structure is completed. All groove welds are first-level welds, and full penetration technology should be used. Both sides of the weld are smoothly connected to the surface of the parent material; after welding is completed, the weld is tested by magnetic particle inspection to ensure the welding quality.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. By installing guide rails on the transport ship and docking the transport ship and the crane ship on both sides of the jacket respectively, the sliding tracks of the transport ship, the jacket, the crane ship and the upper assembly are in the same straight line. Then, the traction rope of the traction equipment is wound around the guide wheel of the jacket and then wound around the rear transport ship and connected to the upper assembly. By utilizing the traction effect of the traction equipment and the guiding effect of the guide wheel, the upper assembly can be first moved to the head position of the transport ship, so as to be close to the jacket. Then, the crane ship is used to lift the upper assembly and move it in a straight line toward the guide frame, thereby shortening the lifting path of the upper assembly in the air to the greatest extent. At this time, the traction equipment continues to be wound up, so that the traction rope is always kept in a taut state, which improves the wind resistance of the upper assembly during the lifting and transfer process, until the upper assembly is hoisted onto the jacket. Finally, the connection operation of the jacket and the upper assembly is completed, which is conducive to improving construction efficiency and safety. 2. By arranging an airbag at the head of the transport ship, when the transport ship moves to the side of the jacket, the airbag contacts the jacket, and the airbag plays an anti-collision role, so that the transport ship can approach the jacket to the greatest extent, and keep a safe distance between the transport ship and the jacket, which is conducive to improving construction safety; 3. In the hoisting preparation step, when the transport ship approaches the conductor frame, the speed of travel is gradually slowed down, and the airbag is inflated at the same time. The airbag expands and the bottom sinks into the water. When the airbag abuts against the side of the conductor frame, the airbag forms an installation platform between the conductor frame and the transport ship, so that the construction personnel can perform the guide wheel installation step and the towing rope winding step of the towing equipment, which is conducive to the smooth pulling of the upper component. In addition, when the upper component moves from the middle of the transport ship to the head of the transport ship, the transport ship has a tendency to tilt forward under the weight of the upper component. The airbag sinking setting increases the buoyancy of the head of the transport ship, which is conducive to reducing the risk of tilting forward of the transport ship and making the transport ship reach a balanced state. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the state when the upper component is located at the head position of the transport ship in a construction method for connecting the foundation conductor frame of an offshore booster station with the upper component in an embodiment of the present application.

[0023] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0024] Figure 3 It is a schematic diagram of the state when the upper component is hoisted above the conductor frame in a construction method for connecting the foundation conductor frame of an offshore booster station with the upper component in an embodiment of the present application.

[0025] Explanation of the accompanying reference numerals: 1. crane vessel; 2. transport vessel; 3. guide rail; 4. traction equipment; 41. traction rope; 5. sliding frame; 6. upper component; 61. support column; 7. catheter frame; 71. guide wheel; 8. airbag. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-3 This application is described in further detail.

[0027] The present application embodiment discloses a construction method for connecting a foundation conductor frame and an upper component of an offshore booster station, referring to Figure 1 and Figure 2 , including the following steps: S1: Transportation preparation: Install two guide rails 3 on the transport ship 2. The two guide rails 3 are symmetrically distributed on both sides of the transport ship 2 and extend along the length direction of the transport ship 2. Install a sliding frame 5 on each guide rail 3, then place the upper component 6 on the sliding frame 5, and temporarily lock the upper component 6 and the sliding frame 5. The guide rail 3 is made of high-strength steel with good corrosion resistance and wear resistance. The sliding frame 5 is made of stainless steel and is equipped with ball bearings inside to reduce friction and improve sliding efficiency.

[0028] In addition, a traction device 4 is installed at the stern of the transport ship 2. The traction device 4 is a winch, which is mainly composed of an electric motor, a winding drum and a traction rope 41. The electric motor has a power of 50 kW and can provide sufficient traction. The steel wire rope is a galvanized steel wire rope with a diameter of 20 mm, which is high in strength and corrosion-resistant and suitable for offshore operations.

[0029] In order to increase the stability of the transport ship 2, a balancing block, such as a water tank or other weights, can be added to the transport ship 2 to maintain the stability of the ship. At the same time, a support rod can also be set in the middle of the transport ship 2 to fix the upper assembly 6 to prevent it from shaking during movement.

[0030] S2: Preparation for lifting: The transport ship 2 and the crane ship 1 travel to the front and rear sides of the conductor frame 7 respectively, and install guide wheels 71 on the conductor frame 7. The guide wheels 71 are made of aluminum alloy, which is light and durable, and the surface is specially treated to reduce wear. The guide wheel 71 is installed on the side of the conductor frame 7, with a moderate height to facilitate the winding of the traction rope 41. Then the connecting end of the traction rope 41 of the traction equipment 4 is pulled to the head of the transport ship 2, and then the connecting end of the traction rope 41 is wound around the guide wheel 71 on the side of the conductor frame 7 and then wound back to the transport ship 2, and then the connecting end of the traction rope 41 is connected to the bottom of the upper component 6, and then the traction equipment 4 is started, and the upper component 6 moves along the guide rail 3 to the head of the transport ship 2 under the cooperation of the traction rope 41 and the guide wheel 71.

[0031] In this process, in order to prevent the transport ship 2 from tilting due to excessive load, the above-mentioned balancing measures can be taken. In addition, in order to ensure that the transport ship 2 safely approaches the conductor frame 7, an airbag 8 can be set at the head of the transport ship 2. The airbag 8 is made of multiple layers of nylon fabric and is filled with inert gas, such as nitrogen or helium, in the middle to ensure that it can still maintain elasticity under high pressure. The height of the airbag 8 is 1 meter, the width is 2 meters, and the length can be adjusted according to actual conditions. When the transport ship 2 approaches the conductor frame 7, it gradually slows down its speed and inflates the airbag 8 at the same time. The airbag 8 expands and the bottom sinks into the water. When the transport ship 2 moves to the side of the conductor frame 7, the airbag 8 contacts the conductor frame 7, and the airbag 8 forms an installation platform between the conductor frame 7 and the transport ship 2, so that the staff can complete the installation steps of the guide wheel 71 and the winding steps of the traction rope 41 of the traction device 4 on the airbag 8. When the upper component 6 moves from the middle of the transport ship 2 to the head of the transport ship 2, the transport ship 2 has a tendency to tilt forward under the heavy pressure of the upper component 6. The airbag 8 is set to sink to the bottom, which increases the buoyancy of the head of the transport ship 2, helps reduce the risk of the transport ship 2 tilting forward and allows the transport ship 2 to reach a balanced state.

[0032] In this embodiment, two traction devices 4 and two guide wheels 71 are provided, and the two guide wheels 71 correspond to the traction ropes 41 of the two traction devices 4 respectively. The two guide wheels 71 are respectively disposed on the left and right sides of the jacket 7, and the distance between the two traction devices 4 is equal to the distance between the left and right sides of the jacket 7. When the crane vessel 1 hoists the upper assembly 6 to the top of the jacket 7, the connecting end of the traction rope 41 is vertically arranged, so that the force of the upper assembly 6 during the hoisting process can be effectively balanced, and the tilting or swinging problem caused by uneven force at a single point can be avoided, thereby significantly improving the safety and stability of the construction.

[0033] S3: Hoisting construction: refer to Figure 1 and Figure 3 , connect the lifting device of the crane ship 1 with the upper component 6, then release the temporary locking state of the sliding frame 5 and the upper component 6, and lift the upper component 6 by the crane ship 1. In this process, the transport ship 2 withdraws a distance away from the jacket 7 to provide sufficient installation space for the upper component 6, and at the same time starts the traction device 4 to keep the traction rope 41 taut. Then the crane ship 1 slowly lowers the jacket 7 until the support column at the bottom of the upper component 6 is plugged and fixed into the hole at the top of the jacket 7 leg.

[0034] When several support columns of the upper assembly are accurately placed in the corresponding main leg holes of the jacket 7, the welding work between the upper assembly and the jacket 7 is completed, and then the crane ship 1 is unhooked and evacuated, and then the upper assembly 6 and the jacket 7 are welded and fixed. All groove welds are first-level welds, using a full penetration process, and both sides of the welds are smoothly connected to the surface of the parent material; after welding is completed, the welds are subjected to magnetic particle inspection to ensure the welding quality.

[0035] It should be emphasized that during the transportation and hoisting process, in order to monitor the state of the upper component 6 in real time and ensure the safety and stability of the transportation and hoisting process, acceleration sensors can be installed under several support columns of the upper component. The acceleration sensors are used to detect the vertical acceleration and horizontal acceleration of the upper component during transportation and hoisting. Inclinometers are installed on the tops of several support columns of the upper component. Inclinometers are used to detect the lateral inclination value and longitudinal inclination value of the upper component during transportation and hoisting. In addition, when the crane ship 1 lifts the upper component 6, the horizontal distance between the upper component 6 and the lifting equipment of the crane ship 1 is 7m, which effectively avoids the safety hazards and operational inconvenience caused by too close or too far distance during the hoisting process, and improves the safety and accuracy of the hoisting. The distance from the bottom of the upper component 6 to the sea level is 15m, which ensures that there is enough height margin during the hoisting process to prevent the risk of collision caused by factors such as waves, and further improves the safety of construction.

[0036] This embodiment achieves smooth movement of the upper component 6 by installing the guide rail 3 and the sliding frame 5 on the transport ship 2 and utilizing the cooperation of the traction device 4 and the guide wheel 71. Compared with the traditional overall lifting method, this method greatly shortens the lifting path of the upper component 6 in the air, reduces the impact of wind and waves on the lifting process, and improves construction efficiency and safety. In particular, the use of the airbag 8 not only plays an anti-collision role, but also serves as a temporary platform to facilitate the operation of construction personnel. In addition, through the monitoring of the acceleration sensor and the inclinometer, the safety of the construction process is further enhanced, ensuring the stability and accuracy of the upper component 6 during the lifting process.

[0037] The design of the dual guide wheels 71 and the dual traction device 4 effectively solves the problem of deflection that may be caused by single-point traction, ensuring the horizontal and vertical posture of the upper assembly 6 during the lifting process. This design not only improves the accuracy of lifting, but also greatly improves the safety of construction. Especially in complex offshore environments, the synergy of the dual guide wheels 71 and the dual traction device 4 is particularly important.

[0038] Through real-time monitoring of the acceleration sensor and the inclinometer, the dynamic changes of the upper assembly 6 during the entire lifting process can be fully understood. Once an abnormal situation is found, such as a sudden increase in acceleration or a deviation of the inclination angle from the predetermined range, the system will immediately issue an alarm to remind the construction personnel to take corresponding measures. This real-time monitoring mechanism not only improves the safety of construction, but also can detect problems in time and avoid potential risks.

[0039] By optimizing the welding process, a firm connection between the upper assembly 6 and the jacket 7 is ensured. The full penetration process and the selection of high-performance welding materials make the weld have high mechanical properties and can resist the erosion of the harsh offshore environment. Magnetic particle testing, as a reliable non-destructive testing method, ensures the quality of the weld, eliminates potential safety hazards, and improves the reliability and service life of the entire system.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for connecting a foundation conductor frame of an offshore booster station with an upper assembly, characterized in that: The following steps are involved: Transportation preparation: installing two guide rails (3) on the transport ship (2), the two guide rails (3) are symmetrically distributed on both sides of the transport ship (2) and extend along the length direction of the transport ship (2), and installing a sliding frame (5) on the guide rails (3), and then placing the upper component (6) on the sliding frame (5); installing a traction device (4) at the stern of the transport ship (2); Preparation for lifting: the transport ship (2) and the crane ship (1) travel to the front and rear sides of the jacket (7) respectively, and install guide wheels (71) on the jacket (7), then pull the connection end of the traction rope (41) of the traction device (4) to the head of the transport ship (2), then wrap the connection end of the traction rope (41) around the guide wheel (71) on the side of the jacket (7) and then wrap it back to the transport ship (2), then connect the connection end of the traction rope (41) to the upper component (6), and then start the traction device (4), and the upper component (6) moves to the head of the transport ship (2) under the cooperation of the traction rope (41) and the guide wheel (71); Lifting construction: connect the lifting device of the crane ship (1) to the upper component (6), lift the upper component (6) through the crane ship (1), and start the traction device (4) at the same time to keep the traction rope (41) in a taut state until the upper component (6) is lifted onto the conductor frame (7), and the connection operation between the conductor frame (7) and the upper component (6) is completed.

2. A construction method for connecting a foundation jacket and an upper assembly of an offshore booster station according to claim 1, characterized in that: The head of the transport ship (2) is provided with an air bag (8), and when the transport ship (2) moves to one side of the catheter rack (7), the air bag (8) comes into contact with the catheter rack (7).

3. A construction method for connecting a foundation jacket and an upper assembly of an offshore booster station according to claim 2, characterized in that: In the hoisting preparation step, when the transport ship (2) approaches the conductor frame (7), the speed of travel is gradually slowed down, and the airbag (8) is inflated at the same time. The airbag (8) expands and the bottom sinks into the water. When the airbag (8) abuts against the side of the conductor frame (7), the airbag (8) forms an installation platform between the conductor frame (7) and the transport ship (2), and then the guide wheel (71) installation step and the traction rope (41) of the traction device (4) are wound on the airbag (8).

4. The construction method for connecting the foundation jacket and upper components of an offshore booster station according to claim 1, characterized in that: There are two traction devices (4) and two guide wheels (71), and the two guide wheels (71) correspond to the traction ropes (41) of the two traction devices (4) respectively. The two guide wheels (71) are respectively arranged on the left and right sides of the jacket (7). The distance between the two traction devices (4) is equal to the distance between the left and right sides of the jacket (7). When the crane ship (1) lifts the upper component (6) to the top of the jacket (7), the connection end of the traction rope (41) is arranged vertically.

5. The construction method for connecting the foundation jacket and upper components of an offshore booster station according to claim 1, characterized in that: Acceleration sensors are installed below the plurality of support columns (61) of the upper component (6), and the acceleration sensors are used to detect the vertical acceleration and horizontal acceleration of the upper component (6) during transportation and hoisting.

6. The construction method for connecting the foundation jacket and upper components of an offshore booster station according to claim 1, characterized in that: Inclinometers are installed at the top ends of the plurality of support columns (61) of the upper component (6), and the inclinometers are used to detect the lateral inclination value and the longitudinal inclination value of the upper component (6) during transportation and hoisting.

7. The construction method for connecting the foundation jacket and upper components of an offshore booster station according to claim 1, characterized in that: When the crane ship (1) lifts the upper component (6), the horizontal distance between the upper component (6) and the lifting equipment of the crane ship (1) is 7 m, and the distance from the bottom of the upper component (6) to the sea level is 15 m.

8. The construction method for connecting the foundation jacket and upper components of an offshore booster station according to claim 1, characterized in that: When the plurality of support columns (61) of the upper component (6) are accurately placed in the corresponding main leg holes of the jacket (7), the welding work between the upper component (6) and the jacket (7) is completed, and then the crane vessel (1) is unhooked and evacuated, and then the upper component (6) and the jacket (7) are welded and fixed.

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