A method of installing a derrick for a drilling vessel

Abstract

The application relates to the technical field of drilling ships, in particular to a drilling ship derrick mounting method which is used for connecting first support legs and second support legs of a derrick to first mounting seats and second mounting seats of a ship body respectively, in the drilling ship derrick mounting method, before hoisting the derrick, a length-adjustable shape-keeping tool is arranged between the first support legs and the second legs of the derrick, the shape-keeping tool plays a limiting role on the first support legs and the second support legs, and the interval change between the first support legs and the second support legs in the hoisting process is reduced; in the process of aligning the first support legs with the first mounting seats and aligning the second support legs with the second mounting seats, the interval between the first support legs and the second support legs can be finely adjusted by using the shape-keeping tool, so that the first support legs can be quickly aligned with the first mounting seats, and the second support legs can be quickly aligned with the second mounting seats; and the mounting efficiency of the derrick is improved.

Description

Technical Field

[0001] This application relates to the field of drilling vessel technology, and in particular to a method for installing a drilling rig on a drilling vessel. Background Technology

[0002] The large hydraulic drilling rig derrick is the largest structural component in deep-sea resource exploration equipment, enabling exploration functions. The derrick is over 50 meters high and has a wide span. At the bottom of the derrick, there is a V-shaped channel between two opposing support legs in the width direction of the hull, with a spacing of approximately 15 meters between the V-shaped channels. The bottom of each support leg has multiple first bolt holes arranged at intervals around its axis. The hull mounting base for connecting the support thrust has multiple second bolt holes. During installation, a lifting device is used to lift the derrick and adjust its position so that the first and second bolt holes align. Then, multiple bolts are used to connect the support legs and the mounting base.

[0003] However, without preventative measures, the derrick is prone to dynamic deformation due to its own weight, wind load, and uneven stress on the lifting points during hoisting. This causes the spacing between the two support legs that form the V-shaped channel at the bottom of the derrick to change, which means that the first bolt holes on the support legs cannot be aligned with the second bolt holes on the fixing seat, thus affecting the installation efficiency of the derrick. Summary of the Invention

[0004] Based on this, the purpose of this application is to provide a method for installing a derrick on a drilling vessel, for connecting the first support leg and the second support leg of the derrick to the first mounting base and the second mounting base on the hull, respectively, and to improve the installation efficiency of the derrick. The method for installing a derrick on a drilling vessel of this application includes the following steps: Step S1: Connect the two ends of the conforming fixture along its length to the first support leg and the second support leg, respectively; wherein the length of the conforming fixture is adjustable; Step S2: Lift the derrick and adjust its position so that the first support leg and the first mounting base are vertically opposite each other, and the length direction of the conforming tool is consistent with the direction from the first mounting base to the second mounting base; Step S3: Adjust the length of the conforming fixture so that the second support leg and the second mounting base are vertically aligned. Step S4: Lower the derrick, connect the first mounting base and the first support leg, and connect the second mounting base and the second support leg; Step S5: Remove the conformal tooling from the derrick.

[0005] As an optional solution, step S1 includes: Step S11: Shorten the length of the shape-maintaining fixture; Step S12: Connect one end of the conformal tooling along its length to the first support leg; Step S13: Adjust the length of the shape-keeping fixture and connect the other end of the shape-keeping fixture in the length direction to the second support leg.

[0006] As an optional solution, step S5 includes: Step S51: Disconnect the conformal tooling from one of the second mounting base and the first mounting base; Step S52: Adjust the shortening and shaping tooling; Step S3: Disconnect the conformal tooling from one of the second mounting base and the first mounting base.

[0007] As an optional solution, the conforming fixture includes a main body, a first connector rotatably connected to one end of the main body along its length, and a second connector rotatably connected to the other end of the main body along its length; the first connector is detachably connected to the first support leg, and the second connector is detachably connected to the second support leg.

[0008] As an optional solution, the main body includes a first top support frame, a second top support frame, and a driving component; The second top support is slidably connected to the first top support 111. One end of the driving member is connected to the first top support and the other end is connected to the second top support. The driving member is configured to drive the first top support and the second top support to move closer to or further away from each other. The end of the first top support frame away from the second top support frame is connected to the first connector, and the end of the second top support frame 112 away from the first top support frame 111 is connected to the second connector.

[0009] As an optional solution, the first mounting base is fixedly connected to a first positioning post, the first positioning post including a first positioning part protruding upward from the first mounting base; the first support leg has a first positioning hole. In step S2, making the first support leg and the first mounting seat on the hull vertically aligned includes: making the first positioning hole and the first positioning part vertically aligned.

[0010] As an optional solution, the second mounting base is fixedly connected to a second positioning post, the second positioning post including a second positioning part protruding upward from the second mounting base, and the second support leg having a second positioning hole; In step S3, the second support leg and the second mounting base are aligned vertically, including the second positioning hole and the second positioning part being aligned vertically.

[0011] As an optional solution, in step S4, connecting the first mounting base and the first support leg, the second mounting base and the second support leg includes: inserting the first positioning part into the first positioning hole and inserting the second positioning part into the second positioning hole.

[0012] As an optional solution, in step S4, connecting the first mounting base and the first support leg, the second mounting base and the second support leg further includes: welding the first positioning part to the first support leg and welding the second positioning part to the second support leg.

[0013] As an optional solution, the derrick includes a lower frame and an upper frame, wherein the upper frame is detachably connected to the upper end of the lower frame; Before step S1, the upper frame and the lower frame are in a split state; in steps S1 to S5, the derrick is the lower frame. Following step S5, the following is also included: Step S6: Hoist the upper frame and connect it to the lower frame.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: The drilling vessel derrick installation method of this application is used to connect the first support leg and the second support leg of the derrick to the first mounting base and the second mounting base of the hull, respectively. In the drilling vessel derrick installation method of this application, before hoisting the derrick: an adjustable-length conformal fixture is set between the first support leg and the second leg of the derrick. The conformal fixture plays a limiting role in the first support leg and the second support leg, reducing the change in the distance between the first support leg and the second support leg during the hoisting process; during the alignment of the first support leg with the first mounting base and the alignment of the second support leg with the second mounting base: the conformal fixture can be used to fine adjust the distance between the first support leg and the second support leg, so that the first support leg can be quickly aligned with the first mounting base and the second support leg with the second mounting base; thereby improving the installation efficiency of the derrick. Attached Figure Description

[0015] Figure 1 A schematic diagram of the connection structure between the shape-maintaining tooling and the first and second support legs; Figure 2 for Figure 1 Enlarged view of a section at point C; Figure 3 for Figure 1 Enlarged view of a section at point D; Figure 4 A schematic diagram of the conformal tooling structure; Figure 5 This is a schematic diagram of the derrick from the ship's side. Figure 6 This is a schematic diagram of the derrick from the bow. In the diagram, 100 is the derrick, 101 is the lower frame, 1011 is the first support leg, 1012 is the second support leg, 102 is the upper frame, 201 is the first mounting base, 202 is the second mounting base, 203 is the deck, 1 is the conformal tooling, 11 is the main body, 111 is the first top support frame, 112 is the second top support frame, 113 is the driving component, 12 is the first connecting component, 121 is the first U-shaped pipe clamp, 122 is the first connecting plate, 13 is the second connecting component, 131 is the second U-shaped pipe clamp, 132 is the second connecting plate, 31 is the first positioning post, 311 is the first positioning part, 32 is the second positioning post, and 321 is the second positioning part. Detailed Implementation

[0016] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0017] In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. It should be understood that the terms "first," "second," etc., are used in this application to describe various information, but this information should not be limited to these terms, and these terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0018] like Figures 1 to 6 As shown, the drilling vessel derrick installation method of this application is used to connect the first support leg 1011 and the second support leg 1012 of the derrick 100 to the first mounting base 201 and the second mounting base 202 of the hull, respectively. A preferred embodiment of the drilling vessel derrick installation method of this application includes the following steps: Step S1: Connect the two ends of the conforming fixture 1 along its length to the first support leg 1011 and the second support leg 1012 respectively; wherein, the two ends of the conforming fixture 1 are detachably connected to the first support leg 1011 and the second support leg 1012 by means of fastening connection. Both ends of the conforming fixture 1 along its length are provided with U-shaped slots. The first support leg 1011 and the second support leg 1012 are respectively locked in the U-shaped slots. The opening of the U-shaped slot is provided with a fastener. The fastener can pull the two cantilever parts of the U-shaped slot close together to clamp the first support leg 1011 and the second support leg 1012 in the U-shaped slot. At the same time, the fastener can seal the opening of the U-shaped slot to prevent the first support leg 1011 and the second support leg 1012 from coming out of the U-shaped slot. The length of the conforming fixture 1 is adjustable and can be locked after length adjustment. For ease of installation, step S1 specifically includes: Step S11: Shorten the length of the shape-keeping fixture 1 so that the total length of the shape-keeping fixture 1 is less than the distance between the first support leg 1011 and the second support leg 1012, and then move the shape-keeping fixture 1 into the gap between the first support leg 1011 and the second support leg 1012. Step S12: By moving the shaping fixture 1, one end of the shaping fixture 1 in the length direction is connected to the first support leg 1011; that is, the first support leg 1011 is inserted into the U-shaped groove at one end of the shaping fixture 1. Step S13: Lengthen the shaping fixture 1 and connect the other end of the shaping fixture 1 in the length direction to the second support leg 1012; that is, the second support leg 1012 is inserted into the U-shaped slot at the other end of the shaping fixture 1.

[0019] Step S2: Lift the derrick 100 and adjust the position of the derrick 100 so that the first support leg 1011 and the first mounting base 201 are vertically opposite each other, and make the length direction of the conforming tool 1 consistent with the direction from the first mounting base 201 to the second mounting base 202. Step S3: Adjust the length of the conforming fixture 1 so that the second support leg 1012 and the second mounting base 202 are vertically aligned. At this time, the conforming fixture 1 can be used to fine-tune the distance between the first support leg 1011 and the second support leg 1012, so that the first support leg 1011 can be quickly aligned with the first mounting base 201 and the second support leg 1012 can be aligned with the second mounting base 202, thereby improving the installation efficiency of the derrick 100. Step S4: Lower the derrick 100, connect the first mounting base 201 and the first support leg 1011, and connect the second mounting base 202 and the second support leg 1012; specifically, this step includes fastening and / or welding the first support leg 1011 to the first mounting base 201, and fastening and / or welding the second support leg 1012 to the second support base. Step S5: After the first support leg 1011 is connected to the first mounting base 201 and the second support leg 1012 is connected to the second mounting base 202, the first mounting base 201 and the second mounting base 202 can provide constraints to the derrick 100 to keep the derrick 100 fixed. After that, the conformal tooling 1 is removed from the derrick 100 so that the conformal tooling 1 can be reused.

[0020] In this embodiment, step S5 includes: Step S51: Disconnect the molded tooling 1 from one of the second mounting base 202 and the first mounting base 201; Step S52: Adjust the shortening and shaping fixture 1 so that the first support leg 1011 and the second support leg 1012 disengage from the corresponding U-shaped slots; Step S3: Disconnect the form-fitting fixture 1 from one of the second mounting base 202 and the first mounting base 201.

[0021] In this embodiment, the conforming fixture 1 includes a main body 11, a first connector 12 rotatably connected to one end of the main body 11 along its length, and a second connector 13 rotatably connected to the other end of the main body 11 along its length. The first connector 12 is detachably connected to the first support leg 1011, and the second connector 13 is detachably connected to the second support leg 1012. Specifically, both the first connector 12 and the second connector 13 are U-shaped slotted plates. The first connector 12 is rotatably connected to one end of the main body 11, and its open end faces away from the main body 11. The second connector 13 is rotatably connected to the other end of the main body 11, and its open end faces away from the main body 11. By rotatably connecting the first connector 12 and the second connector 13 to both ends of the main body 11, the conforming fixture 1 possesses angle adaptive capability. Because the V-shaped channel angles of different models of drilling rig 100 vary, the tilt angles of their first support leg 1011 and second support leg 1012 also differ. In this embodiment, the first connector 12 and the second connector 13 are allowed to freely deflect in the vertical plane, thereby automatically fitting and firmly locking onto the support legs with different tilt angles. This design allows the same set of tooling to adapt to various drilling rigs 100 with different structural parameters, significantly improving the versatility and applicability of the conformal tooling 1, and reducing the quantity and cost of dedicated tooling. In other embodiments of this application, the first connector 12 includes a first U-shaped pipe clamp 121 and a first connecting plate 122. The first connecting plate 122 is rotatably connected to the end of the main body 11, and the two ends of the first U-shaped pipe clamp 121 are fastened to the first connecting plate 122. The second connector 13 includes a second U-shaped pipe clamp 131 and a second connecting plate 132. The second connecting plate 132 is rotatably connected to the end of the main body 11, and the two ends of the second U-shaped pipe clamp 131 are fastened to the second connecting plate 132.

[0022] Furthermore, the main body 11 includes a first top support 111, a second top support 112, and a drive member 113; the second top support 112 is slidably connected to the first top support 111, one end of the drive member 113 is connected to the first top support 111, and the other end is connected to the second top support 112, and the drive member 113 is configured to drive the first top support 111 and the second top support 112 to move closer to or further away from each other; the end of the first top support 111 away from the second top support 112 is connected to a first connector 12, and the end of the second top support 112 away from the first top support 111 is connected to a second connector 13. Specifically, both the first top support frame 111 and the second top support frame 112 are ladder structures. The first top support frame 111 includes a first longitudinal rod and a second longitudinal rod extending along the length direction of the conforming tool 1. The first longitudinal rod and the second longitudinal rod are arranged in parallel and spaced apart. The first top support frame 111 also includes a plurality of first transverse rods. The first transverse rods are arranged perpendicular to the first longitudinal rods and the second longitudinal rod. Each of the first transverse rods is arranged in parallel and spaced apart along the length direction of the conforming tool 1. The first longitudinal rod and the second longitudinal rod are tubes. The second top support frame 112 includes a third longitudinal rod and a fourth longitudinal rod extending along the length direction of the conforming tool 1. The third longitudinal rod and the fourth longitudinal rod are arranged in parallel and spaced apart. The second top support frame 112 also includes a plurality of second transverse rods. The second transverse rods are arranged perpendicular to the third longitudinal rod and the fourth longitudinal rod. Each of the second transverse rods is arranged in parallel and spaced apart along the length direction of the conforming tool 1. The third longitudinal rod is slidably inserted into the first longitudinal rod at one end facing the first top support 111, and the fourth longitudinal rod is slidably inserted into the second longitudinal rod at one end facing the first top support 111. The driving member 113 is a threaded rod with a wrench in the middle. The first end of the threaded rod has a forward thread and the second end has a reverse thread. The first end of the threaded rod is threaded to the first transverse rod, and the second end of the threaded rod is threaded to the second transverse rod. The operator can use a wrench to rotate the wrench to make the first top support 111 and the second top support 112 move closer or further apart. To ensure the connection strength, in this embodiment, both the first transverse rod and the second transverse rod connecting the driving member 113 are thickened.

[0023] In this embodiment, a first positioning post 31 is fixedly connected to a first mounting base 201. The first positioning post 31 includes a first positioning portion 311 protruding upward from the first mounting base 201. The first support leg 1011 has a first positioning hole. In step S2, making the first support leg 1011 and the first mounting base 201 on the hull vertically aligned includes making the first positioning hole and the first positioning portion 311 vertically aligned. The height of the first positioning portion 311 is 200mm to 300mm. The arrangement of the first positioning portion 311 and the first positioning hole facilitates the alignment of the first mounting base 201 and the first support leg 1011, further improving the installation efficiency of the derrick 100.

[0024] Furthermore, a second positioning post 32 is fixedly connected to the second mounting base 202. The second positioning post 32 includes a second positioning portion 321 protruding upward from the second mounting base 202, and the second support leg 1012 has a second positioning hole. In step S3, the second support leg 1012 and the second mounting base 202 are aligned vertically, including aligning the second positioning hole with the second positioning portion 321 vertically. The height of the second positioning portion 321 is 200mm to 300mm. Both the upper end of the first positioning portion 311 and the upper end of the second positioning portion 321 are provided with tapered guide portions, further improving the installation efficiency of the derrick 100.

[0025] Furthermore, in step S4, connecting the first mounting base 201 and the first support leg 1011, the second mounting base 202 and the second support leg 1012 includes: inserting the first positioning part 311 into the first positioning hole and inserting the second positioning part 321 into the second positioning hole.

[0026] In this embodiment, step S4, connecting the first mounting base 201 and the first support leg 1011, the second mounting base 202 and the second support leg 1012, further includes: welding the first positioning part 311 to the first support leg 1011 and welding the second positioning part 321 to the second support leg 1012. Specifically, the lower end of the first positioning post 31 is fixedly inserted into the first mounting base 201, and the lower end of the second positioning post 32 is fixedly inserted into the second mounting base 202. The upper part of the first positioning post 31 is welded and fixed to the first support leg 1011, and the upper part of the second support post is welded and fixed to the second support leg 1012, which improves the connection strength between the first support leg 1011 and the first mounting base 201, as well as the connection strength between the second support leg 1012 and the second mounting base 202.

[0027] In this embodiment, the derrick 100 includes a lower frame 101 and an upper frame 102, with the upper frame 102 detachably connected to the upper end of the lower frame 101. Before step S1, the upper frame 102 and the lower frame 101 are in a split state; in steps S1 to S5, the derrick 100 is the lower frame 101. Step S5 is followed by: Step S6: Hoist the upper frame 102 and connect it to the lower frame 101.

[0028] Specifically, by hoisting the derrick in 100 sections, the hoisting weight and center of gravity height were reduced, thus improving hoisting stability.

[0029] Specifically, when hoisting the lower frame 101, since the center of gravity of the lower frame 101 is located in the center of the shaft, the hoisting points are selected on the hoisting lugs on the vertical columns of the lower frame 101. Workers use an aerial work platform to attach steel cables to the hoisting points on the four columns of the lower frame 101. After attaching the steel cables, the aerial work platform moves approximately 5 meters away from the hoisting points, and the commanding personnel are notified to slowly raise the hook. When the steel cables are almost taut, the raising is stopped, and the condition of the steel cables at the four hoisting points is checked. After confirming no abnormalities, the crane is slowly raised for a test lift. When the lower frame 101 is 200mm off the ground, the raising is stopped. During this period, workers use the aerial work platform to check the condition of the steel cables at each hoisting point for any interference or other abnormalities. If any abnormalities are found, lifting is prohibited until the problem is resolved before attempting to lift again. Once everything is normal, the crane is directed to hoist the lower frame 101 onto the ship. As the lower frame 101 approaches the ship's deck 203, checks are made to ensure it will not collide with any equipment on board. After the lower frame 101 is hoisted to the designated position, it is slowly lowered. The lowering is stopped when it approaches the first positioning post 31 and the second positioning post 32. Using pry bars at the four upright positions of the lower frame 101, the first positioning post 31 is aligned with the first positioning hole, and the second positioning post 32 is aligned with the second positioning hole before the lower frame 101 is lowered. After the first support leg 1011 abuts against the first mounting base 201 and the second support leg 1012 abuts against the second mounting base 202, it is checked that all bolt holes on the first support leg 1011 are aligned with bolt holes on the first mounting base 201. If the first support leg 1011 and the second support leg 1012 twist during the hoisting process, the corresponding bolt holes will not be aligned. If there is a misalignment of the bolt holes, a support plate is welded on the hull deck 203, and a hydraulic jack is used to hold the misaligned position, align the bolt holes, and then all the bolts are installed. First, pre-tighten, and then apply torque.

[0030] In summary, the drilling vessel derrick installation method of this application is used to connect the first support leg 1011 and the second support leg 1012 of the derrick 100 to the first mounting base 201 and the second mounting base 202 of the hull, respectively. In the drilling vessel derrick installation method of this application, before hoisting the derrick 100: an adjustable-length conforming fixture 1 is set between the first support leg 1011 and the second leg of the derrick 100. The conforming fixture 1 serves to limit the movement of the first support leg 1011 and the second support leg 1012, reducing the risk of injury during hoisting. The spacing between the first support leg 1011 and the second support leg 1012 changes; during the alignment of the first support leg 1011 with the first mounting base 201, and the alignment of the second support leg 1012 with the second mounting base 202: the conforming tool 1 can actively and finely adjust the spacing between the first support leg 1011 and the second support leg 1012, so that the first support leg 1011 can be quickly aligned with the first mounting base 201, and the second support leg 1012 can be aligned with the second mounting base 202; thereby improving the installation efficiency of the derrick 100.

[0031] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A method for installing a drilling rig on a drilling vessel, for connecting the first support leg (1011) and the second support leg (1012) of the drilling rig (100) to the first mounting base (201) and the second mounting base (202) of the hull, respectively, characterized in that, Includes the following steps: Step S1: Connect the two ends of the conforming fixture (1) along its length to the first support leg (1011) and the second support leg (1012) respectively; wherein the length of the conforming fixture (1) is adjustable; Step S2: Lift the derrick (100), adjust the position of the derrick (100) so that the first support leg (1011) and the first mounting base (201) are vertically opposite each other, and make the length direction of the conforming tool (1) consistent with the direction from the first mounting base (201) to the second mounting base (202); Step S3: Adjust the length of the conforming fixture (1) so that the second support leg (1012) and the second mounting base (202) are vertically aligned. Step S4: Lower the derrick (100), connect the first mounting base (201) and the first support leg (1011), and connect the second mounting base (202) and the second support leg (1012). Step S5: Remove the conformal tooling (1) from the derrick (100).

2. The drilling vessel derrick installation method according to claim 1, characterized in that, Step S1 includes: Step S11: Shorten the length of the shape-conserving fixture (1); Step S12: Connect one end of the conforming fixture (1) along its length to the first support leg (1011). Step S13: Adjust the length of the shape-keeping fixture (1) and connect the other end of the shape-keeping fixture (1) in the length direction to the second support leg (1012).

3. The drilling vessel derrick installation method according to claim 1, characterized in that, Step S5 includes: Step S51: Disconnect the shape-conserving fixture (1) from one of the second mounting base (202) and the first mounting base (201); Step S52: Shorten the length of the shape-conserving fixture (1); Step S3: Disconnect the shape-keeping fixture (1) from one of the second mounting base (202) and the first mounting base (201).

4. The drilling vessel derrick installation method according to claim 1, characterized in that, The shaping fixture (1) includes a body part (11), a first connector (12) rotatably connected to one end of the body part (11) in the length direction, and a second connector (13) rotatably connected to the other end of the body part (11) in the length direction; the first connector (12) is detachably connected to the first support leg (1011), and the second connector (13) is detachably connected to the second support leg (1012).

5. The drilling vessel derrick installation method according to claim 4, characterized in that, The main body (11) includes a first top support (111), a second top support (112), and a drive member (113). The second top support (112) is slidably connected to the first top support (111) 111. One end of the driving member (113) is connected to the first top support (111) and the other end is connected to the second top support (112). The driving member (113) is configured to drive the first top support (111) and the second top support (112) to move closer to or further away from each other. The end of the first top support (111) away from the second top support (112) is connected to the first connector (12), and the end of the second top support (112) 112 away from the first top support (111) 111 is connected to the second connector (13).

6. The drilling vessel derrick installation method according to claim 1, characterized in that, The first mounting base (201) is fixedly connected to a first positioning post (31), the first positioning post (31) includes a first positioning part (311) protruding upward from the first mounting base (201); the first support leg (1011) has a first positioning hole; In step S2, making the first support leg (1011) and the first mounting seat (201) on the hull face each other vertically includes making the first positioning hole and the first positioning part (311) face each other vertically.

7. The drilling vessel derrick installation method according to claim 6, characterized in that, The second mounting base (202) is fixedly connected to a second positioning post (32), the second positioning post (32) includes a second positioning part (321) protruding upward from the second mounting base (202), and the second support leg (1012) has a second positioning hole; In step S3, the second support leg (1012) and the second mounting base (202) are aligned vertically, including the second positioning hole and the second positioning part (321) being aligned vertically.

8. The drilling vessel derrick installation method according to claim 7, characterized in that, In step S4, connecting the first mounting base (201) and the first support leg (1011), the second mounting base (202) and the second support leg (1012) includes: inserting the first positioning part (311) into the first positioning hole and inserting the second positioning part (321) into the second positioning hole.

9. The drilling vessel derrick installation method according to claim 8, characterized in that, In step S4, connecting the first mounting base (201) and the first support leg (1011), the second mounting base (202) and the second support leg (1012) further includes: welding the first positioning part (311) to the first support leg (1011) and welding the second positioning part (321) to the second support leg (1012).

10. The drilling vessel derrick installation method according to claim 1, characterized in that, The derrick (100) includes a lower frame (101) and an upper frame (102), wherein the upper frame (102) is detachably connected to the upper end of the lower frame (101); Before step S1, the upper frame (102) and the lower frame (101) are in a split state; in steps S1 to S5, the derrick (100) is the lower frame (101). Following step S5, the following is also included: Step S6: Hoist the upper frame (102) and connect the upper frame (102) to the lower frame (101).

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