A kind of centering tool for triangular truss type pile leg surrounding well and centering installation method

Abstract

The present invention discloses a centering tool and a centering installation method for a triangular truss pile leg enclosure, which relates to the field of ship and marine engineering technology. The centering tool comprises a triangular support frame and a clamping plate, a positioning frame is arranged inside the triangular support frame, and clamping plates are arranged at the three vertices of the triangular support frame respectively. The centering installation method comprises the following steps: pre-burying the centering tool in the segment of the enclosure; estimating the structural deformation of the enclosure, setting the pile shoe center distance and rib position, and arranging the pile shoe according to the setting; positioning and welding the upper and lower layers of the enclosure, checking the verticality and centering of the enclosure during welding, and after the enclosure welding is completed, determining whether the position of the pile shoe needs to be adjusted and re-marking the center of the new enclosure. The advantages of the present invention are: the welding shrinkage can be effectively monitored during the enclosure welding, the welding sequence can be adjusted through data feedback, the welding amount is more uniform, the segment alignment is more accurate during welding, the pile leg slot is more vertical, and the deformation of the pile leg slot can also be controlled.

Description

Technical Field

[0001] The invention relates to the technical field of ships and marine engineering, and in particular to a centering tool for a triangular truss type pile leg enclosure well and a centering installation method. Background Art

[0002] The leg structures of offshore platforms are divided into two categories: truss legs and cylindrical legs. Truss legs are generally used on self-elevating offshore platforms with operating water depths exceeding 60m, and are required to be able to effectively reduce the wave loads of the ocean on the legs, thereby ensuring the stability of the self-elevating offshore platform. The periphery of the triangular truss legs is provided with leg wells, and the bottom of the legs is docked with the pile shoes.

[0003] The traditional method of centering the pile leg well is to use a total station and marking: 1. Find the ship baseline and rib position baseline; 2. Find the projection of the pile shoe center baseline according to the off-center size and rib position number on the design drawing, and make ground sample marks for the off-center baseline and rib position baseline respectively; 3. Arrange the pile shoe according to the ground sample position; 4. Close the sections around the pile shoe; 5. Close the well section. After closing, the pile shoe position needs to be adjusted due to welding shrinkage; 6. Lift the pile leg and dock the pile shoe. Step 5 is the key to the above steps. The well section structure is dense and complex, and it is easy to produce welding deformation when closing. The problems that may be caused by welding deformation include: (1) Enlarging the slot opening of the rack plate of the pile leg, resulting in a reduction in the adjustable thickness of the wear-resistant plate, resulting in the wear-resistant plate being too thick or too thin; the wear-resistant plate is on the lifting frame and is specifically used for friction when the pile leg is raised and lowered. The thinner the wear-resistant plate is, the shorter the subsequent use time will be. It is difficult to replace the wear-resistant plate, so a certain thickness must be guaranteed. Ensure the design service life of the wear-resistant plate; if the wear-resistant plate is too thick, it will lose its effectiveness and increase the impact load of the pile leg lifting; if the wear-resistant plate is too thin, it will accelerate the wear margin of the lifting frame structure and affect the structural strength; (2) The upper and lower sections of the lifting enclosure are misaligned, resulting in steps in the rack slot, which may generate impact loads; (3) The slot of the lifting enclosure is not vertical. If it is not corrected, the entire pile leg will deflect in one direction; if it is corrected, the pile leg will have greater internal stress during the lifting and lowering process. It is necessary to provide a centering tool and centering installation method for a triangular truss pile leg enclosure to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a centering tooling and a centering installation method for a triangular truss pile leg enclosure, which can solve the problems in the prior art that the lifting enclosure is prone to upper and lower segment misalignment, large welding deformation, and non-perpendicularity to the ground due to welding shrinkage during the closing process.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows: a kind of centering tool for a triangular truss pile leg surrounding well, comprising a triangular support frame and a clamping plate, wherein the triangular support frame is an equilateral triangle adapted to the structure of the triangular truss pile leg, a positioning frame is arranged inside the triangular support frame, the positioning frame is arranged vertically with one side of the triangular support frame, one end of the positioning frame is connected and fixedly connected with a vertex of the triangular support frame, and the other end of the positioning frame is connected and fixedly connected with the midpoint of one side of the triangular support frame arranged vertically therewith;

[0006] The three vertices of the triangular support frame are respectively provided with card plates, the midpoints of the card plates are connected and fixed to the vertices of the triangular support frame, and the card plates and the angle bisectors at the corresponding vertices of the triangular support frame are arranged perpendicularly;

[0007] The intersection of the central vertical lines of the three sides of the triangular support frame is the positioning center, and the positioning center is arranged on the positioning frame.

[0008] Furthermore, a positioning hole is provided at the positioning center of the positioning frame, and a plumb bob is hung downward in the positioning hole.

[0009] Furthermore, the triangular support frame is made of channel steel, and the clamping plate is a steel plate.

[0010] A method for centering and installing a triangular truss pile leg enclosure well, characterized in that it comprises the following steps:

[0011] S1. Make pile legs, pile shoes, well enclosure and lifting frame respectively. When making well enclosure in sections, embed the centering tool in the sections of the well enclosure. The length of the centering tool's pallet can be placed in the slot of the well enclosure.

[0012] S2. The estimated comprehensive deformation of the wellbore structure from the midship line is m, where m is -20~20mm;

[0013] S3. Mark the center of the ground sample on the ground or pile shoe as (A, FR);

[0014] S4. Pre-arrangement of pile shoes: refer to the whole ship layout, set the pile shoe center distance as A, the rib position as FR, pre-arrange the pile shoes to the theoretical center distance, and align the rib position with the designed rib position;

[0015] S5. Close the outer structure of the well;

[0016] S6. Locate the lower well section according to the position of (A+m, FR) and trim the structural margin;

[0017] S7, positioning the upper well enclosure so that the center of the upper well enclosure is aligned with the lower well enclosure;

[0018] S8. Weld the upper and lower enclosures. Before welding, the personnel hang a plumb bob downward in the position hole at the positioning center of the centering tool. During the welding process, the position of the plumb bob hung on the centering tool is tracked to monitor the welding shrinkage during the welding process. The verticality and centering of the enclosure are checked through the centering tool.

[0019] S9. After the upper and lower layers of the well enclosure are welded together, the well enclosure and the peripheral structure are welded together. During the welding process, the alignment between the well enclosure center and the ground sample line is closely checked. After the welding is completed, due to the shrinkage of the welding, the well enclosure center will move from (A+m, FR) to (A, FR);

[0020] S10, after the surrounding well welding is completed, check the deviation between the final pile shoe positioning center and the surrounding well positioning center. If the deviation is within the tolerance range, there is no need to adjust the pile shoe position; otherwise, the pile shoe position needs to be adjusted;

[0021] S11, after the well positioning welding is completed, the center of the new well is re-measured and marked (A0, FR0);

[0022] S12. Install the lifting frames. The final dimensions of the three lifting frames after installation are based on (A0, FR0), and ensure that the final tolerance is within the allowable range;

[0023] S13. Lifting pile legs.

[0024] Furthermore, in step S1, when the well enclosure is produced in sections, if the sections are multi-layered, at least two sets of centering tools need to be arranged to ensure that the sections are aligned and vertically downward.

[0025] Furthermore, in step S8, when the verticality and centering of the enclosure are checked by the centering tool during the welding process, the welding sequence is adjusted by data feedback to make the welding amount uniform.

[0026] Furthermore, in step S6, when positioning the lower layer surrounding well segment, the parallelism deviation between the center line and the theoretical rib position line is 1 mm.

[0027] The advantages of the present invention are:

[0028] 1) During the welding of the enclosure, the welding shrinkage during the welding process can be effectively monitored by tracking the position of the plumb bob hung on the centering tool. The welding sequence can be adjusted through data feedback to make the welding amount more uniform. In this way, the segments are more accurately aligned during welding, and the upper and lower segments are less likely to be misaligned. The pile leg slots are more vertical, the welding stress is released more evenly, the deformation of the pile leg slots can also be controlled, and the construction quality is higher;

[0029] 2) During the construction process, the centering tool can be used to observe the segment alignment at any time, which greatly reduces the difficulty of on-site construction;

[0030] 3) The centering tooling can strengthen the segmented structure of the shaft enclosure and reduce the deformation of the segmented lifting.

[0031] 4) The centering tool can serve as an operation channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the centering tool of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the pile leg surrounding well, pile legs and pile shoes in an embodiment of the present invention;

[0034] Figure 3 It is a top view of the segmented pre-embedded centering tooling for the pile leg surrounding well in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The following embodiments can enable technicians in this field to understand the present invention more comprehensively, but the present invention is not limited to the scope of the embodiments.

[0036] This specific implementation adopts the following technical solutions: Figure 1 As shown, a centering tool for a triangular truss pile leg well enclosure includes a triangular support frame 1 and a clamping plate 2. The triangular support frame 1 is an equilateral triangle adapted to the structure of the triangular truss pile leg 20. The triangular support frame 1 is made of three channel steels of sufficient width. A positioning frame 3 is provided inside the triangular support frame 1. The positioning frame 3 is vertically arranged to one side of the triangular support frame 1, and one end of the positioning frame 3 is connected and fixed to a vertex of the triangular support frame 1, and the other end of the positioning frame 3 is connected and fixed to the midpoint of one side of the triangular support frame 1 vertically arranged thereto. The triangular support frame 1 and the positioning frame 3 are welded as a whole. The positioning frame 3 is a channel steel of sufficient width. The channel steel should have sufficient strength so that the centering tool 10 can be used as a pedestrian working channel.

[0037] A card plate 2 is respectively arranged at the three vertices of the triangular support frame 1, the midpoint of the card plate 2 is connected and fixed to the vertex of the triangular support frame 1, and the card plate 2 and the angle bisector at the corresponding vertices of the triangular support frame 1 are arranged perpendicularly, and the card plate 3 is a steel plate.

[0038] The intersection of the central vertical lines of the three sides of the triangular support frame 1 is the positioning center, and the positioning center is arranged on the positioning frame 3. A positioning hole 4 is arranged at the positioning center of the positioning frame 3, and a downward plumb bob is hung in the positioning hole 4.

[0039] A method for centering and installing a triangular truss pile leg enclosure well comprises the following steps:

[0040] S1, respectively manufacture the pile legs 20, pile shoes 30, the surrounding well 40 and the lifting frame 50. When the surrounding well 40 is manufactured in sections, the centering tool 10 is pre-buried in the sections of the surrounding well 40, such as Figure 3 As shown, the length of the clamping plate 2 of the centering tool 10 ensures that it can be placed in the groove of the surrounding well 40. The centering tool 10 can also strengthen the segmented structure of the surrounding well 40 and reduce the deformation of the segmented lifting. When the surrounding well 40 is segmented, if the segment is multi-layer, at least two sets of centering tools 10 need to be arranged to ensure that the segment is straight and vertically downward.

[0041] S2. It is estimated that the comprehensive deformation of the structure of the wellbore 40 deviates from the midship line is m, where m is -20~20mm.

[0042] S3. Mark the center of the ground sample on the ground or the pile shoe 30 as (A, FR).

[0043] S4. Pre-arrange the pile shoe 30: with reference to the whole ship arrangement, set the pile shoe 30 center distance to A, the rib position to FR, and pre-arrange the pile shoe 30 to the theoretical center distance, with the rib position aligned with the designed rib position.

[0044] S5. Closing the outer structure of the surrounding well 40.

[0045] S6. Locate the 40-section lower well enclosure according to the position of (A+m, FR), trim the structural margin, and when locating the 40-section lower well enclosure, the parallelism deviation between the center line and the theoretical rib position line is 1mm.

[0046] S7, positioning the upper enclosure 40 so that the center of the upper enclosure 40 is aligned with the lower enclosure 40.

[0047] S8. Weld the upper and lower layers of the well enclosure 40. Before welding, a worker hangs a plumb bob downward in the position hole 4 at the positioning center of the centering tool 10. During welding, the position of the plumb bob hung on the centering tool 10 is tracked to monitor welding shrinkage during welding. The verticality and centering of the well enclosure 40 are checked through the centering tool 10. During welding, when the verticality and centering of the well enclosure 40 are checked through the centering tool 10, the welding sequence is adjusted through data feedback to make the welding amount uniform.

[0048] S9. After the upper and lower layers of the well enclosure 40 are welded together, the well enclosure 40 and the peripheral structure are welded together. During the welding process, the alignment between the center of the well enclosure 40 and the ground sample line is closely checked. After welding is completed, due to the shrinkage of welding, the center of the well enclosure 40 will move from (A+m, FR) to (A, FR).

[0049] S10, after the welding of the surrounding well 40 is completed, check the deviation between the final positioning center of the pile shoe 30 and the positioning center of the surrounding well 40. If the deviation is within the tolerance range, there is no need to adjust the position of the pile shoe 30. Otherwise, the position of the pile shoe 30 needs to be adjusted.

[0050] S11. After the positioning welding of the enclosure 40 is completed, the center of the new enclosure 40 is remeasured and marked (A0, FR0).

[0051] S12, installing the lifting frames 50, the final dimensions of the three lifting frames 50 after installation are based on (A0, FR0), and ensuring that the final tolerance is within the allowable range.

[0052] S13, hoist the pile leg 20, and then install the pile leg 20. The installation diagram of the pile leg surrounding well 40, the pile leg 20, the pile shoe 30, and the lifting frame 50 is shown in FIG. Figure 2 As shown, the lifting frame 50 is a link between the offshore platform and the pile legs 20. The pile legs 20 and the lifting frame 50 are meshed with the pile leg racks and the gears of the lifting gear box to achieve the climbing and descending of the offshore platform. The lifting frame 50 is arranged on the periphery of the pile legs 20. The lifting frame 50 can also fix the direction of the pile legs 20 to ensure that the pile legs 20 are always vertically upward.

[0053] During the welding of the shaft enclosure according to the specific implementation method, by tracking the position of the plumb bob hung on the centering tool, the welding shrinkage during the welding process can be effectively monitored. The welding sequence can be adjusted through data feedback to make the welding amount more uniform. In this way, during welding, the segments can be more accurately aligned, and the upper and lower segments are less likely to be misaligned. The pile leg slots can be more vertical, the welding stress can be released more evenly, the deformation of the pile leg slots can also be controlled, and the construction quality is higher. Since the segment alignment can be observed at any time through the centering tool during the construction process, the difficulty of on-site construction is greatly reduced.

[0054] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A centering tool for a triangular truss pile leg surrounding well, characterized by: It comprises a triangular support frame and a clamping plate, wherein the triangular support frame is an equilateral triangle adapted to the structure of the triangular truss-type pile leg, a positioning frame is arranged inside the triangular support frame, the positioning frame is vertically arranged with one side of the triangular support frame, one end of the positioning frame is connected and fixed with a vertex of the triangular support frame, and the other end of the positioning frame is connected and fixed with the midpoint of one side of the triangular support frame vertically arranged with the positioning frame; The three vertices of the triangular support frame are respectively provided with card plates, the midpoints of the card plates are connected and fixed to the vertices of the triangular support frame, and the card plates and the angle bisectors at the corresponding vertices of the triangular support frame are arranged perpendicularly; The intersection of the central vertical lines of the three sides of the triangular support frame is the positioning center, and the positioning center is set on the positioning frame; A positioning hole is provided at the positioning center of the positioning frame, and a plumb bob is hung downward in the positioning hole.

2. A triangular truss type pile leg well centering tool according to claim 1, characterized in that: The triangular support frame is made of channel steel, and the clamping plate is a steel plate.

3. The installation method of the centering tool for the triangular truss type pile leg enclosure according to claim 1 is characterized by: The following steps are involved: S1. Make pile legs, pile shoes, well enclosure and lifting frame respectively. When making well enclosure in sections, embed the centering tool in the sections of the well enclosure. The length of the centering tool's pallet can be placed in the slot of the well enclosure. S2. The estimated comprehensive deformation of the wellbore structure from the midship line is m, where m is -20~20mm; S3. Mark the center of the ground sample on the ground or pile shoe as (A, FR); S4. Pre-arrangement of pile shoes: refer to the whole ship layout, set the pile shoe center distance as A, the rib position as FR, pre-arrange the pile shoes to the theoretical center distance, and align the rib position with the designed rib position; S5. Close the outer structure of the well; S6. Locate the lower well section according to the position of (A+m, FR) and trim the structural margin; S7, positioning the upper well enclosure so that the center of the upper well enclosure is aligned with the lower well enclosure; S8. Weld the upper and lower enclosures. Before welding, the personnel hang a plumb bob downward in the position hole at the positioning center of the centering tool. During the welding process, the position of the plumb bob hung on the centering tool is tracked to monitor the welding shrinkage during the welding process. The verticality and centering of the enclosure are checked through the centering tool. S9. After the upper and lower layers of the well enclosure are welded together, the well enclosure and the peripheral structure are welded together. During the welding process, the alignment between the well enclosure center and the ground sample line is closely checked. After the welding is completed, due to the shrinkage of the welding, the well enclosure center will move from (A+m, FR) to (A, FR); S10, after the surrounding well welding is completed, check the deviation between the final pile shoe positioning center and the surrounding well positioning center. If the deviation is within the tolerance range, there is no need to adjust the pile shoe position; otherwise, the pile shoe position needs to be adjusted; S11, after the well positioning welding is completed, the center of the new well is re-measured and marked (A0, FR0); S12. Install the lifting frames. The final dimensions of the three lifting frames after installation are based on (A0, FR0), and ensure that the final tolerance is within the allowable range; S13. Lifting pile legs.

4. The installation method of the centering tool for the triangular truss type pile leg enclosure according to claim 3 is characterized by: In step S1, when the well enclosure is segmented, if the segment is multi-layered, at least two sets of centering tools need to be arranged to ensure that the segment is straight and vertically downward.

5. The installation method of the centering tool for the triangular truss type pile leg enclosure according to claim 3 is characterized by: In step S8, during the welding process, the verticality and centering of the enclosure are checked by the centering tool, and the welding sequence is adjusted by data feedback to make the welding amount uniform.

6. The installation method of the centering tool for the triangular truss type pile leg enclosure according to claim 3 is characterized by: In step S6, when positioning the lower layer surrounding well segment, the parallelism deviation between the center line and the theoretical rib position line is 1 mm.

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