A method for constructing and installing an FPSO topside module support pylon

Abstract

The application discloses a kind of FPSO upper module pier construction installation method, comprising the following steps: step 1, cradle frame production;Step 2, fixed pier top panel and component installation position scribe;Step 3, component installation position scribe;Step 4, install pier cross stiffener;Step 5, install the surrounding plate of pier periphery;Step 6, pier measurement;Step 7, each pier installation position scribe;Step 8, each pier welding;Step 9, the position precision detection of each pier.The application is sealed to pier top panel by cradle frame, when cross stiffener and surrounding plate are welded, so that pier top panel has very small deformation, thereby ensuring the levelness of pier top panel and the dimensional accuracy of pier;The application uses the mode of installation and detection, strictly executes welding process and carries out real-time monitoring to welding, once found out that it is out of tolerance, should immediately adjust in time, greatly improves the dimensional accuracy and installation accuracy of pier.

Description

Technical Field

[0001] This invention relates to the field of FPSO supermodule support manufacturing technology, specifically to a method for constructing and installing FPSO supermodule supports. Background Technology

[0002] In FPSO construction, the piers serve as the connecting hub between the superstructure and the hull, effectively and smoothly transferring the load of the superstructure to the deck and distributing it evenly across the hull. However, the construction and installation of the piers present significant challenges. The massive amount of welding involved in connecting the pier panels to the cross-shaped reinforcing plates and cofferdams easily leads to welding deformation. Furthermore, the presence of a 0.9m high arch in the beam direction on the main deck, coupled with the requirement for a level surface on the pier surface, places even higher demands on the pier construction. In actual construction, the piers exhibit considerable error, necessitating improvements in their construction and installation to meet the specific construction requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a method for constructing and installing the upper module support of an FPSO, which greatly improves the dimensional accuracy and installation accuracy of the support.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A method for constructing and installing a superstructure support pier for an FPSO, characterized by comprising the following steps:

[0006] Step 1, jig fabrication: The fabricated jig is used for the prefabrication of modular supports; the levelness of the upper surface of the jig must not exceed 1mm;

[0007] Step 2: Fix the top panel of the support and mark the installation position of the component: After the dimensions of the top panel of the support are inspected and approved, it is hoisted onto the jig. The level of the top panel of the support is adjusted so that the top panel of the support is in close contact with the surface of the jig. After the center line of the top panel of the support is aligned with the center line of the cross, the top panel of the support is sealed to the surface of the jig using the pressure bracket and the sealing jig plate.

[0008] Step 3, Marking the installation positions of components: The components include the cross reinforcement plate of the support and the surrounding plate of the support. Mark the installation lines of the cross reinforcement plate, the surrounding plate, and the 100mm inspection line on the surface of the top panel of the support.

[0009] Step 4: Install the cross reinforcement plate of the support pier: hoist the cross reinforcement plate of the support pier to the installation line of the cross reinforcement plate of the support pier on the surface of the top panel of the support pier, use a 100mm inspection line to check the position and installation accuracy of the cross reinforcement plate of the support pier, use a right angle ruler to measure and control the verticality of the cross reinforcement plate of the support pier, and then weld the cross reinforcement plate of the support pier to the top panel of the support pier.

[0010] Step 5: Install the surrounding panels around the abutment: The surrounding panels around the cross reinforcing plate of the abutment are installed by symmetrical welding. One panel is hoisted to the abutment panel installation line on the surface of the top panel of the abutment and the position installation accuracy of the panel is checked with a 100mm inspection line. After welding the panel to the cross reinforcing plate and the top panel of the abutment, the panel on the opposite side of the previous panel is installed.

[0011] Step 6, Abutment Measurement: After the surrounding panels are installed, select 9 inspection points, including 5 inspection points at the center point of the cross reinforcement plate of the abutment and 4 edge endpoints, and the other 4 inspection points at the 4 corners of the four surrounding panels.

[0012] Step 7: Marking the installation positions of each support: Based on the theoretical dimensions of the deck sections and modular supports, mark the installation position markings and inspection lines of the cross-shaped reinforcing plates and cofferdams corresponding to each support on the FPSO's hull deck.

[0013] Step 8: Welding of each support block: Hoist each support block onto the FPSO's hull deck, aligning the surrounding panels and support block cross reinforcement plates with the installation position markings on the deck, and use a 100mm inspection line to check the positional installation accuracy of the panels and support block cross reinforcement plates; weld each support block onto the FPSO's hull deck.

[0014] Step 9: Position accuracy test of each support: After the welding of each support under the upper module is completed, it should be measured. Any positions that do not meet the accuracy requirements should be adjusted. Then, the levelness and height data of each support panel should be measured.

[0015] Furthermore, in step 4, the verticality error of the cross-shaped reinforcing plate of the support is less than 1 mm.

[0016] Furthermore, in step 9, a reference pole is erected on the deck of the FPSO. The reference pole is made of square steel tube, and four total station reference targets are attached to the four sides of the square steel tube. All total station reference targets are calibrated to ensure that they are at the same horizontal height.

[0017] Furthermore, in step 8, the deviation between the center line of the cross reinforcement plate on each support and the installation position marking line of the cross reinforcement plate on each support on the FPSO hull deck is ≤ ±4mm.

[0018] Furthermore, in step 8, the deviation between the center line of the cofferdam around each support and the cofferdam installation position marking line of each support on the FPSO hull deck is ≤±6mm.

[0019] Furthermore, in step 9, the levelness of the top panel of each support pier is ≤3mm.

[0020] Furthermore, in step 9, the center height deviation of the top panel of each pier is ≤4mm.

[0021] Furthermore, in step 9, the deviation of each support along the length and width of the ship is ≤ ±6mm.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention uses a jig to seal the top panel of the support pier, ensuring minimal deformation of the top panel during the welding of the cross-shaped reinforcing plate and the surrounding plate, thereby guaranteeing the levelness of the top panel and the dimensional accuracy of the support pier. This invention adopts a method of simultaneous installation and inspection, strictly adhering to the welding process and monitoring the welding in real time. If any deviation is found, it should be adjusted immediately, greatly improving the dimensional accuracy and installation accuracy of the support pier. Attached Figure Description

[0024] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort:

[0025] Figure 1 This is a flowchart of the present invention;

[0026] Figure 2 A schematic diagram of the structure after the cross-shaped reinforcing plate of the support pier is installed;

[0027] Figure 3 This is a layout diagram of the nine inspection points after the enclosure panels are installed.

[0028] Figure 4 A schematic diagram showing the markings for the installation positions of each support pier on the deck surface;

[0029] Figure 5 This is a diagram showing the inspection layout for the benchmark and the benchmark optical target. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper surface," "lower surface," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "forward," "reverse," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] like Figure 1 As shown, a method for constructing and installing an upper module support pier of an FPSO is characterized by comprising the following steps:

[0033] Step 1, jig fabrication: The fabricated jig is used for the prefabrication of modular supports; the levelness of the upper surface of the jig should not exceed 1mm.

[0034] Step 2: Fix the top panel of the support: After the dimensions of the top panel of the support are inspected and approved, it is hoisted onto the jig. The level of the top panel of the support is adjusted so that the top panel of the support is in close contact with the surface of the jig. After the center line of the top panel of the support is aligned with the center line of the cross, the top panel of the support is sealed to the surface of the jig using the pressure clips and the sealing plate.

[0035] Step 3: Marking the installation positions of components: The components include the cross reinforcement plate of the support and the surrounding plate of the support. Mark the installation lines of the cross reinforcement plate, the surrounding plate, and the 100mm inspection line on the surface of the top panel of the support.

[0036] Step 4: Install the cross-shaped reinforcing plate of the support pier: Hoist the cross-shaped reinforcing plate 1 to the installation line on the surface of the top panel 2 of the support pier. Use a 100mm inspection line to check the positional installation accuracy of the cross-shaped reinforcing plate. Use a right-angle ruler 3 to measure and control the verticality of the cross-shaped reinforcing plate. Then weld the cross-shaped reinforcing plate to the top panel of the support pier. The verticality error of the cross-shaped reinforcing plate should be less than 1mm. Figure 2 As shown.

[0037] Step 5: Install the surrounding panels around the abutment: The surrounding panels around the cross reinforcing plate of the abutment are installed by symmetrical welding. One panel is hoisted to the abutment surrounding panel installation line on the surface of the top panel of the abutment and the position and installation accuracy of the panel is checked with a 100mm inspection line. After welding the panel to the cross reinforcing plate and the top panel of the abutment, the panel on the opposite side of the previous panel is installed.

[0038] Because the amount of welding between the modular support panel and the support cross reinforcement plate and surrounding plate is huge, welding deformation is easily generated, which affects the levelness of the panel. Therefore, in addition to reducing welding current, slowing down welding speed, and using conventional methods such as back welding and symmetrical welding to reduce welding deformation, the welding sequence should be arranged reasonably.

[0039] Step 6: Support Measurement: After the surrounding panels 4 are installed, select 9 inspection points: P1, P2, P3, P4, P5, P6, P7, P8, and P9. Of these 5 inspection points, P5 is the center point of the support's cross-shaped reinforcing plate, and P2, P4, P6, and P8 are the four edge endpoints. The other 4 inspection points, P1, P3, P7, and P9, are the four corner connections formed by the four surrounding panels. Figure 3 As shown.

[0040] Step 7: Marking the installation positions of each support pier: Based on the theoretical dimensions of the deck sections and modular support piers, mark the installation position markings and inspection lines for the cross-shaped reinforcing plates and cofferdams corresponding to each support pier on the FPSO's hull deck; for example... Figure 4 As shown, the spacing of the six supports at the intersection of axes a, b, c and axes e, f is checked by marking the reverse lines on the deck surface of each support. The spacing of the center lines of the cross reinforcement plates of the supports at the intersection of axes a, b, c and axes e, f is measured to ensure that the deviation of the center lines of the cross reinforcement plates of the supports at the six supports in the length and width directions meets the requirements.

[0041] Step 8: Welding of each support: Hoist each support onto the FPSO's hull deck, aligning the surrounding panels and support cross reinforcement plates with the installation position markings on the deck, and use a 100mm inspection line to check the positional installation accuracy of the panels and support cross reinforcement plates; weld each support onto the FPSO's hull deck.

[0042] The deviation between the center line of the cross reinforcement plate on each support and the installation position marking line of the cross reinforcement plate on each support on the FPSO hull deck is ≤±4mm.

[0043] The deviation between the center line of the cofferdam around each pier and the cofferdam installation position marking line of each pier on the FPSO hull deck is ≤±6mm.

[0044] Step 9: Positional accuracy inspection of each support: After the welding of each support under one upper module is completed, it should be measured. Any positions that do not meet the accuracy requirements should be adjusted. Then, the levelness and height data of each support panel should be measured. For example... Figure 5 As shown, a reference pole is erected on the deck of the FPSO. The reference pole is made of square steel tube, and four total station reference targets are attached to the four sides of the square steel tube. All total station reference targets are calibrated to ensure that they are at the same horizontal height.

[0045] Working Principle: This invention uses a jig to seal the top panel of the pier. During the welding of the cross-shaped reinforcing plates and the cofferdam, the top panel of the pier experiences minimal deformation, thus ensuring the levelness of the top panel and the dimensional accuracy of the pier. This invention employs a simultaneous installation and inspection method, strictly adhering to the welding process and monitoring the welding in real time. Any deviations from tolerances are immediately adjusted, significantly improving the dimensional and installation accuracy of the piers. The levelness of the top panel of each pier is ≤3mm. The center height deviation of the top panel of each pier is ≤4mm. The deviation of each pier along the length and width of the ship is ≤±6mm.

[0046] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those embodiments or examples, without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for constructing and installing a support pier for an FPSO upper module, characterized in that, Includes the following steps: Step 1, jig fabrication: The fabricated jig is used for the prefabrication of modular supports; the levelness of the upper surface of the jig must not exceed 1mm; Step 2: Fix the top panel of the support and mark the installation position of the component: After the dimensions of the top panel of the support are inspected and approved, it is hoisted onto the jig. The level of the top panel of the support is adjusted so that the top panel of the support is in close contact with the surface of the jig. After the center line of the top panel of the support is aligned with the center line of the cross, the top panel of the support is sealed to the surface of the jig using the pressure bracket and the sealing jig plate. Step 3, Marking the installation positions of components: The components include the cross reinforcement plate of the support and the surrounding plate of the support. Mark the installation lines of the cross reinforcement plate, the surrounding plate, and the 100mm inspection line on the surface of the top panel of the support. Step 4: Install the cross reinforcement plate of the support pier: hoist the cross reinforcement plate of the support pier to the installation line of the cross reinforcement plate of the support pier on the surface of the top panel of the support pier, use a 100mm inspection line to check the position and installation accuracy of the cross reinforcement plate of the support pier, use a right angle ruler to measure and control the verticality of the cross reinforcement plate of the support pier, and then weld the cross reinforcement plate of the support pier to the top panel of the support pier. Step 5: Install the surrounding panels around the abutment: The surrounding panels around the cross reinforcing plate of the abutment are installed by symmetrical welding. One panel is hoisted to the abutment panel installation line on the surface of the top panel of the abutment and the position installation accuracy of the panel is checked with a 100mm inspection line. After welding the panel to the cross reinforcing plate and the top panel of the abutment, the panel on the opposite side of the previous panel is installed. Step 6, Abutment Measurement: After the surrounding panels are installed, select 9 inspection points, including 5 inspection points at the center point of the cross reinforcement plate of the abutment and 4 edge endpoints, and the other 4 inspection points at the 4 corners of the four surrounding panels. Step 7: Marking the installation positions of each support: Based on the theoretical dimensions of the deck sections and modular supports, mark the installation position markings and inspection lines of the cross-shaped reinforcing plates and cofferdams corresponding to each support on the FPSO's hull deck. Step 8: Welding of each support block: Hoist each support block onto the FPSO's hull deck, aligning the surrounding panels and support block cross reinforcement plates with the installation position markings on the deck, and use a 100mm inspection line to check the positional installation accuracy of the panels and support block cross reinforcement plates; weld each support block onto the FPSO's hull deck. Step 9: Position accuracy test of each support: After the welding of each support under the upper module is completed, it should be measured. Any positions that do not meet the accuracy requirements should be adjusted. Then, the levelness and height data of each support panel should be measured.

2. The construction and installation method of the FPSO upper module support pier according to claim 1, characterized in that: In step 4, the verticality error of the cross-shaped reinforcing plate of the support is less than 1 mm.

3. The construction and installation method of the FPSO upper module support pier according to claim 1, characterized in that: In step 9, a reference pole is erected on the deck of the FPSO. The reference pole is made of square steel tube, and four total station reference targets are attached to the four sides of the square steel tube. All total station reference targets are calibrated to ensure that they are at the same horizontal height.

4. The construction and installation method of the FPSO supermodule support pier according to claim 1, characterized in that: In step 8, the deviation between the center line of the cross reinforcement plate on each support and the installation position marking line of the cross reinforcement plate on each support on the FPSO hull deck is ≤±4mm.

5. The construction and installation method of the FPSO supermodule support pier according to claim 1, characterized in that: In step 8, the deviation between the center line of the cofferdam around each support and the cofferdam installation position marking line of each support on the FPSO hull deck is ≤±6mm.

6. The construction and installation method of the FPSO supermodule support pier according to claim 1, characterized in that: In step 9, the levelness of the top panel of each support pier is ≤3mm.

7. The construction and installation method of the FPSO supermodule support pier according to claim 1, characterized in that: In step 9, the center height deviation of the top panel of each support pier is ≤4mm.

8. The construction and installation method of the FPSO supermodule support pier according to claim 1, characterized in that: In step 9, the deviation of each support along the length and width of the ship is ≤ ±6mm.

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