A method for assembling a lightweight derrick

Abstract

This invention proposes a method for assembling a lightweight derrick, comprising the following steps: preparing an assembly site and configuring embedded ground bells; disassembling the derrick body into four components: upper, upper right, lower left, and lower right, respectively labeled a, b, c, and d; horizontally assembling components c and d, pre-tightening structural bolts; vertically assembling components b, c, and d together; horizontally assembling component a, installing outfitting parts, and erecting the assembly; hoisting component a onto components b, c, and d; and installing and laying pipelines, cables, and equipment between the components to complete the derrick assembly. This invention provides clear visibility of the straightness, verticality, and overall dimensions of the main structure in a horizontal configuration, allowing for more precise and clear control; it grounds high-altitude operations, greatly reducing construction difficulty and improving efficiency; it is applicable to the assembly of all lightweight derricks, has wide applicability, and improves the safety and efficiency of the entire construction process.

Description

Technical Field

[0001] This invention belongs to the field of offshore drilling platform technology, specifically relating to a method for assembling a lightweight derrick. Background Technology

[0002] Large hydraulic drilling rigs are the largest structural equipment in the core equipment for deep-sea resource exploration, enabling exploration functions. They adopt a spliced ​​structure and bear the overall weight of the rig, the lateral righting force under drilling conditions, and the inertial force generated by the ship's roll, pitch, and heave. The stress state is complex, and the rig structure integrates a large number of exploration equipment and related systems, making the assembly work extremely labor-intensive and difficult. Process planning, production organization, and safety management all face enormous challenges.

[0003] Compared to traditional derricks, the stress on large hydraulic drilling rig derricks is mainly concentrated on the compensating cylinders. This type of derrick structure is relatively weak, and its main structure consists of numerous components, mostly made of high-strength profiles. The derrick integrates a large number of expensive drilling and production equipment, among which the hoisting, compensating, and drilling / production equipment have complex spatial coordinate relationships and require high positioning accuracy. During construction, multiple different disciplines and systems have overlapping and interdependent installation sequences and spatial arrangements. Simultaneously, ensuring the assembly accuracy of the derrick body and the matching accuracy of the equipment installation presents significant challenges to derrick manufacturing and assembly. Therefore, a new method for assembling this type of derrick is urgently needed. Summary of the Invention

[0004] To address the technical problems in the prior art, the present invention provides a lightweight derrick assembly method, comprising the following steps:

[0005] Prepare the assembly site and install embedded floor bells on the site;

[0006] The main body of the derrick is disassembled into four blocks: upper, upper right, lower left, and lower right, which are recorded as blocks a, b, c, and d respectively.

[0007] Assemble C and D horizontally and pre-tighten the structural bolts;

[0008] Assemble the horizontal derrick components b, c, and d together after they are upright;

[0009] Horizontal assembly component a, install outfitting parts, and stand it upright to assemble the whole assembly;

[0010] Hoist component a onto component bcd;

[0011] Install and lay out the pipelines, cables, and equipment between the components to complete the assembly of the derrick.

[0012] Furthermore, preparing the assembly site specifically includes:

[0013] Set a 1:1 derrick base;

[0014] The embedded ground bell is configured according to the horizontal construction area of ​​the derrick.

[0015] Furthermore, before disassembling the main body of the derrick, positioning pin holes should be made on the structures that need to be assembled.

[0016] Furthermore, block a is the top fixed top drive track area at the top of the derrick, with a clear boundary from the bottom; it is decomposed into two main bodies on both sides with the V-shaped channel as the center for horizontal assembly, denoted as c and d respectively; half of c includes the structural beam directly above the V-shaped channel, and the remaining part d is the other end; block b is the upper right part, and its main function is to facilitate the vertical assembly of c and d, reduce the number of docking positions, and achieve the purpose of rapid assembly.

[0017] Furthermore, the horizontal assembly of C and D specifically includes:

[0018] Pre-tighten the structural bolts. At this stage, install outfitting components and equipment that can be fully secured. Tighten the bolts again, and then slowly install the pipe-like outfitting components at the upper and lower ends.

[0019] Furthermore, the assembly of the horizontal derrick components b, c, and d vertically together specifically includes:

[0020] Using two cranes in coordination, the horizontal derrick assembly C is erected and placed on a 1:1 derrick base. The bolts are tightened, and one crane is retained to prevent the derrick assembly from tilting.

[0021] Using two cranes in coordination, the horizontal derrick assembly d is erected and placed on a 1:1 derrick base, and the bolts connecting it to the derrick assembly d are tightened.

[0022] Using two cranes, the horizontal derrick component b was erected and assembled together with component cd.

[0023] Furthermore, it also includes precision control, specifically including:

[0024] During the site preparation phase, a total station is used to mark the main precision control points of the derrick on the bottom surface, providing a precision control benchmark for the subsequent assembly of the derrick.

[0025] The positioning pin holes of large components are positioned using laser equipment, and the accuracy is controlled by the positioning pins.

[0026] During the assembly of each component, the accuracy of the derrick is checked using a total station. If there is any deviation, the derrick is adjusted using a hydraulic jack, and then all connecting bolts are tightened.

[0027] Furthermore, the embedded ground bell's support point with the derrick is adjustable, and precision control also includes:

[0028] By adjusting the adjustable head, the horizontal assembly accuracy of the derrick is ensured, and the coplanarity of the derrick is guaranteed.

[0029] By using a vertical line, the assembly accuracy of the derrick in the vertical direction is ensured, and the straightness of the derrick is guaranteed.

[0030] Simultaneously monitoring the precision control points allows for quick verification of the main dimensional precision control points of the derrick assembly.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] In the horizontal position, the straightness, verticality, and other precision data of the main structure, as well as the overall dimensions, are clearly visible, allowing for more precise and clear control. This invention grounds high-altitude operations, greatly reducing construction difficulty and improving efficiency. It is applicable to the assembly of all lightweight derricks, has wide applicability, and enhances the safety and efficiency of the entire construction process. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the derrick base configuration of the present invention;

[0034] Figure 2 This is a schematic diagram of the embedded floor bell configuration of the present invention;

[0035] Figure 3 This is a schematic diagram of the connection between the well frame and the ground bell of the present invention;

[0036] Figure 4 This is a schematic diagram (I) of component c of the present invention installed on the derrick base;

[0037] Figure 5 This is a schematic diagram (II) of component c of the present invention installed on the derrick base;

[0038] Figure 6 This is schematic diagram III showing component c of the present invention installed on the derrick base;

[0039] Figure 7 This is a schematic diagram of components c and d of the present invention installed on the derrick base;

[0040] Figure 8 This is a schematic diagram (I) showing component b of the present invention installed on components c and d;

[0041] Figure 9 This is a schematic diagram (II) showing component b of the present invention installed on components c and d;

[0042] Figure 10 This is a schematic diagram I of the horizontal assembly component a of the present invention;

[0043] Figure 11 This is a schematic diagram (II) of the horizontal assembly component a of the present invention;

[0044] Figure 12 This is a schematic diagram (III) of the horizontal assembly component a of the present invention;

[0045] Figure 13 This is a schematic diagram (I) showing component a being hoisted onto components b, c, and d of the present invention;

[0046] Figure 14 This is a schematic diagram (II) showing component a being hoisted onto components b, c, and d of the present invention. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] Reference Figure 1 This application proposes a method for assembling a lightweight derrick, the specific implementation method of which is as follows:

[0049] 1. Prepare the assembly site: The site needs to be equipped with embedded ground bells, configured according to the horizontal construction area of ​​the derrick, see [reference]. Figure 2 , 3 At this point, a total station is used to mark the main precision control points of the derrick on the bottom surface, providing a precision control benchmark for the subsequent assembly of the derrick and enabling real-time monitoring.

[0050] 2. Prepare the assembly site: The site needs to be equipped with embedded ground bells and a 1:1 derrick base should be installed. See [link / details]. Figure 1 Positioning pin holes are made on the structure to be assembled. The positions of the positioning pin holes of large components are all positioned using laser equipment, and the accuracy is controlled by the positioning pins.

[0051] 3. Decomposition of the main body of the derrick: Decompose the derrick into four blocks: upper, upper right, lower left, and lower right, which are recorded as blocks a, b, c, and d respectively.

[0052] 4. Block a is the uppermost fixed top drive track area of ​​the derrick, with a clear boundary from the lower end. Centered on the V-shaped channel, it is divided into two main bodies for horizontal assembly, denoted as c and d. Half of c includes the structural beam directly above the V-shaped channel, and the remaining part d is the other end. Block b is the upper right part, and its main function is to facilitate the vertical assembly of c and d, reducing the number of docking points and achieving rapid assembly.

[0053] 5. Assemble C and D horizontally, pre-tighten the structural bolts, install outfitting components and equipment that can be fully fixed at this stage, tighten the bolts, and slowly install the pipe-type outfitting components at the upper and lower ends; (install drilling and production equipment, iron outfitting platform and ladder, high-pressure mud pipe, hydraulic pipe, cable tray and lighting fixtures, etc.);

[0054] 6. Precision Control: In this stage, the assembly precision of the derrick is ensured by adjusting the adjustable support (in the horizontal direction, to ensure the coplanarity of the derrick). The assembly precision of the derrick is also ensured by using a vertical line (in the vertical direction, to ensure the straightness of the derrick). At the same time, the precision control points are monitored, which can quickly verify the main dimension precision control points of the derrick assembly.

[0055] 7. See Figure 4-9 As shown, using two cranes, horizontal derrick assembly c is erected and placed on a 1:1 derrick base, bolts are tightened, and one crane is retained to prevent the derrick assembly from tilting; using two cranes, horizontal derrick assembly d is erected and placed on a 1:1 derrick base, and bolts connecting it to derrick assembly d are tightened; using two cranes, horizontal derrick assembly b is erected and assembled together with derrick d.

[0056] 8. Recheck the derrick accuracy data. Use a total station to check the derrick accuracy. If there is a deviation, adjust the derrick using a hydraulic jack and tighten all connecting bolts. This is the final torque.

[0057] 9. See Figure 10-12 As shown, using the same method, horizontal assembly group a is assembled, outfitting components are installed, and finally the whole assembly is erected.

[0058] 10. See Figure 13 , 14 Component a is hoisted onto component bcd, and the precision of component a is adjusted.

[0059] 11. After adjustment, tighten all connecting bolts. This is the final torque.

[0060] 12. Install and lay out the pipelines, cables, and equipment between the components to complete the assembly of the derrick.

[0061] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the specification are within the scope of the present invention.

Claims

1. A method for assembling a lightweight derrick, characterized in that, Includes the following steps: Prepare the assembly site and install embedded floor bells on the site; The main body of the derrick is disassembled into four blocks: upper, upper right, lower left, and lower right, which are recorded as blocks a, b, c, and d respectively. Assemble C and D horizontally and pre-tighten the structural bolts; Assemble the horizontal derrick components b, c, and d together after they are upright; Horizontal assembly component a, install outfitting parts, and stand it upright to assemble the whole assembly; Hoist component a onto component bcd; Install and lay out the pipelines, cables, and equipment between the components to complete the assembly of the derrick; Preparing the assembly site specifically includes: Set a 1:1 derrick base; The embedded ground bell is configured according to the horizontal construction area of ​​the derrick; Before disassembling the main body of the derrick, make positioning pin holes on the structures that need to be assembled. Block A is the top fixed top drive track area of ​​the derrick, with a clear boundary from the bottom. Centered on the V-shaped channel, it is divided into two main bodies for horizontal assembly, denoted as C and D respectively. Half of C includes the structural beam directly above the V-shaped channel, and the remaining part d is the other end. Block B is the upper right part, and its main function is to facilitate the vertical assembly of C and D, reduce the number of docking points, and achieve the purpose of rapid assembly. The horizontal assembly of C and D specifically includes: Pre-tighten the structural bolts. At this stage, install outfitting components and equipment that can be fully secured. Tighten the bolts again. Install the pipe-type outfitting components at the upper and lower ends slowly. The assembly of horizontal derrick components b, c, and d together after they are erected specifically includes: Using two cranes in coordination, the horizontal derrick assembly C is erected and placed on a 1:1 derrick base. The bolts are tightened, and one crane is retained to prevent the derrick assembly from tilting. Using two cranes in coordination, the horizontal derrick assembly d is erected and placed on a 1:1 derrick base, and the bolts connecting it to the derrick assembly d are tightened. Using two cranes in coordination, the horizontal derrick component b is erected and assembled together with component cd; It also includes precision control, specifically including: During the site preparation phase, a total station is used to mark the main precision control points of the derrick on the bottom surface, providing a precision control benchmark for the subsequent assembly of the derrick. The positioning pin holes of large components are positioned using laser equipment, and the accuracy is controlled by the positioning pins. During the assembly of each component, the accuracy of the derrick is checked using a total station. If there is any deviation, the derrick is adjusted using a hydraulic jack, and then all connecting bolts are tightened. The embedded ground bell's support point with the derrick is adjustable, and precision control also includes: By adjusting the adjustable head, the horizontal assembly accuracy of the derrick is ensured, and the coplanarity of the derrick is guaranteed. By using a vertical line, the assembly accuracy of the derrick in the vertical direction is ensured, and the straightness of the derrick is guaranteed. Simultaneously monitoring the precision control points allows for quick verification of the main dimensional precision control points of the derrick assembly.

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