Novel offshore equipment cabin transition section structure and construction method thereof

Abstract

The invention discloses a novel offshore equipment cabin transition section structure and a construction method thereof, and relates to the technical field of equipment cabin construction, the novel offshore equipment cabin transition section structure comprises a transition subsection, a prefabricated structure is connected above the transition subsection, the prefabricated structure comprises a plurality of prefabricated subsection structures, a prefabricated roof layer is further connected above the prefabricated structure, and an outer wall surface is further arranged on the periphery of the prefabricated structure; the segmented structure comprises a plurality of stand columns and vertical walls, and equipment installation positions are reserved on the inner sides or the outer sides of the vertical walls. And a plurality of lifting lugs are fixed to the prefabricated roof layer, the prefabricated roof layer and the segmented structure below the prefabricated roof layer are lifted to the positions above other segmented structures through the lifting lugs, and welding is conducted. And the effects of reducing the high-altitude operation risk and improving the welding quality are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment cabin construction, and in particular to a novel offshore equipment cabin transition section structure and a construction method thereof. Background Art

[0002] The offshore equipment room transition section is different from the existing upper block form. It has small working space, thin steel plate, high height and great construction difficulty. There is currently no reference case in the domestic equipment room transition section platform form. Therefore, a new offshore equipment room transition section structure and its construction method are urgently needed, which can be combined with process planning to formulate a plan to complete the production of the platform. Summary of the invention

[0003] The purpose of the present invention is to provide a new offshore equipment cabin transition section structure and a construction method thereof, which can reduce the risk of high-altitude operations, improve welding quality, and open up a new model for the construction of a new equipment cabin transition section platform, laying a solid foundation for the subsequent production of such products.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A novel offshore equipment cabin transition section structure comprises a transition segment, wherein a prefabricated structure is connected above the transition segment, the prefabricated structure comprises a plurality of prefabricated segment structures, a prefabricated roof layer is also connected above the prefabricated structure, an outer wall surface is also arranged on the periphery of the prefabricated structure, the segment structure comprises a plurality of columns and vertical walls, and equipment installation positions are reserved on the inner or outer sides of the vertical walls; a plurality of lifting ears are fixed on the prefabricated roof layer, and the prefabricated roof layer and the segment structure below it are hoisted to the top of other segment structures by the lifting ears for welding.

[0005] Furthermore, the transition segment, each segment structure and the prefabricated roof layer are fixed by welding.

[0006] Furthermore, the outer wall surface includes a plurality of enclosure surfaces, and the enclosure surfaces are fixed to the outer periphery of the corresponding segmented structure.

[0007] Furthermore, the segmented structure also includes a segmented node plate positioned and fixed at the bottom, the column is fixed at a position directly above the corresponding segmented node plate, and the segmented structure is positioned and welded to the adjacent segmented structure through the segmented node plate.

[0008] A novel method for constructing a transition section structure of an offshore equipment cabin comprises the following steps: Step S1, firstly make transition segments, each segment structure and prefabricated roof layer, wherein each segment structure is first-layer segment, second-layer segment, ... N-layer segment from bottom to top; Step S2, hoisting the prefabricated roof layer to the top of the N-layer segment, welding them together after positioning, and then welding the corresponding enclosure surface; Step S3, hoisting the prefabricated roof layer and the N-layer segment as a whole to the top of the N-1-layer segment, welding them to each other after positioning, and then welding the corresponding enclosure surface; Step S4, repeat the above steps to install downwards until the last layer is installed on a segment, and the corresponding enclosure surface is welded to complete the installation.

[0009] Furthermore, after the transition segment is constructed, it is turned over and a layer of segments is constructed directly thereon.

[0010] Furthermore, the construction process of the transition section includes making a bottom plate, installing internal reinforcement materials and an outer cylinder on the bottom plate, and then installing a plurality of box girders located outside the cylinder on the bottom plate, and finally installing a top ring plate on the upper side of the box girder and a flange on the upper side of the cylinder.

[0011] Furthermore, the construction process of the first-floor segment includes welding columns and vertical walls on the transition segment after turning over.

[0012] Furthermore, the construction process of the two-story segment, the three-story segment...the N-story segment includes the splicing and welding of the main beam structure and the secondary beam structure, and then positioning and welding the node plate therein, and then welding the decking on top, and positioning and welding the columns and vertical walls above the decking.

[0013] Furthermore, the construction process of the prefabricated roof layer includes the splicing and welding of the main beam structure and the secondary beam structure, and then positioning and welding the node plate therein, and then welding the decking plate on top, and welding the lifting lugs on the decking plate.

[0014] In summary, the present invention has the following beneficial effects: The transition section and equipment cabin are constructed by prefabrication in sections and hoisting as a whole, and the ground prefabrication depth is increased as much as possible to reduce the workload of high-altitude operations. At the same time, the relevant equipment on each deck will be installed in place after the deck is hoisted. The process pipelines, electrical, instrumentation, outfitting, ventilation, painting and other systems are all completed on land, and purging, pressure testing and pre-trial operation are carried out to reduce the amount of offshore tooling; 1. The closing height is reduced, which reduces the risk of high-altitude operations and improves welding quality; 2. The utilization rate of the internal structure working space is effectively improved, reducing welding operations in confined spaces; 3. Effectively control thin plate welding inside the workshop, reduce outdoor welding operations, and improve project quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a new offshore equipment cabin transition section structure of this embodiment; Figure 2 This is a schematic diagram of the transition section assembly process in a construction method of a novel offshore equipment cabin transition section structure in this embodiment; Figure 3 This is a schematic diagram of the assembly process of the prefabricated roof layer in a construction method of a novel offshore equipment cabin transition section structure in this embodiment; Figure 4 This is a schematic diagram of a four-layer segmented assembly process in a construction method of a novel offshore equipment cabin transition section structure in this embodiment; Figure 5 This is a schematic diagram of a three-layer segmented assembly process in a construction method of a novel offshore equipment cabin transition section structure in this embodiment; Figure 6 It is a schematic diagram of the two-layer segmented assembly process in a construction method of a novel offshore equipment cabin transition section structure in this embodiment; Figure 7 This is a schematic diagram of a one-layer segmented assembly process in a construction method of a novel offshore equipment cabin transition section structure in this embodiment; Figure 8 This is a schematic diagram of the assembly process of the prefabricated roof layer and the four-layer segmented hoisting in a method for constructing a novel offshore equipment cabin transition section structure in this embodiment; Fig. 9 It is a schematic diagram of the four-layer and three-layer segmented assembly process in a construction method of a novel offshore equipment cabin transition section structure in this embodiment; Fig.10 It is a schematic diagram of the three-layer and two-layer segmented assembly process in a construction method of a novel offshore equipment cabin transition section structure in this embodiment; Fig.11 It is a schematic diagram of the second-layer and first-layer segmented assembly process in a construction method of a novel offshore equipment cabin transition section structure in this embodiment.

[0016] In the figure, 1. transition segment; 2. exterior wall; 3. TB wall; 4. outer guardrail; 5. stairwell; 6. ladder; 7. handrail; 8. lifting lug. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, and this embodiment does not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] A new type of offshore equipment cabin transition section structure, such as Figure 1As shown, it includes a transition segment 1 at the bottom, and a prefabricated structure is connected above the transition segment 1. The prefabricated structure includes several prefabricated segmented structures. A prefabricated roof layer is also connected above the prefabricated structure. The top plate of the prefabricated roof layer is a gable roof structure with natural slope. A stairwell 5 and an outer circle of guardrails 4 are connected to the prefabricated roof layer. A ladder 6 is fixed on the outside of the stairwell 5. A railing 7 is connected to the outer periphery of the top of the stairwell 5. An outer wall surface 2 is also provided on the periphery of the prefabricated structure. The segmented structure includes several columns and vertical walls (including TB wall 3). The TB wall 3 is an ordinary steel structure vertical wall. Equipment installation positions and ventilation and dehumidification ducts are reserved on the outside of the TB wall 3. A plurality of lifting ears 8 are welded and fixed on the prefabricated roof layer, and the prefabricated roof layer and the segmented structure below it are hoisted through the lifting ears 8 to the top of other segmented structures for welding.

[0019] In this embodiment, the transition segment 1, each segment structure and the prefabricated roof layer are fixed by welding; the outer wall surface 2 includes a plurality of enclosure surfaces, which are fixed to the outer periphery of the corresponding segment structure; in order to facilitate the installation and positioning between layers, the segment structure and the prefabricated roof layer also include a segment node plate positioned and fixed at the bottom, and the column is fixed at the position directly above the corresponding segment node plate. The segment structure or the prefabricated roof layer is positioned and welded to the adjacent segment structure through the segment node plate.

[0020] This embodiment also discloses a new construction method for the transition section structure of an offshore equipment cabin. According to the characteristics of this project, combined with the construction site and machinery, the structure assembly follows the principle of layered prefabrication, from top to bottom, from inside to outside. When making the structure, a welding shrinkage of 0.8 / 1000mm needs to be set; the straightness error of the main column within any 3m of the length shall not exceed 3mm; when the length of the column exceeds 12m, the straightness error within any 12m of the length shall not exceed 10mm; It specifically includes the following steps: Step S1, first make a transition segment 1, each segment structure and a prefabricated roof layer, wherein each segment structure is a first-layer segment, a second-layer segment, a third-layer segment and a fourth-layer segment from bottom to top; after the transition segment 1 is built, turn it over and directly build a first-layer segment thereon; like Figure 2 As shown, the construction process of the transition segment 1 includes making a base plate after making a tire frame, installing internal stiffeners and an outer cylinder on the base plate, and then installing a number of box girders located outside the cylinder on the base plate, and finally installing a top ring plate on the upper side of the box girder and a flange on the upper side of the cylinder; the four columns are welded after adjusting their sizes to theoretical sizes before the flange is installed and after the welding of other structures is completed.

[0021] like Figure 3As shown, the construction process of the prefabricated roof layer includes, after the tire frame is made, the main beam structure and the secondary beam structure are spliced ​​and welded, and then the node plate is positioned and welded therein, and then the decking is welded on top, and the lugs 8, the vertical walls (corrugated boards), the stairwell 5, the stairs and the outer guardrail 4 are welded on the decking.

[0022] like Figure 4 As shown, the construction process of the four-story segment includes, after making the tire frame, completing the splicing and welding of the main beam structure and the secondary beam structure, and then positioning and welding the node plate therein, and then welding the decking on top, and positioning and welding the columns, vertical walls (corrugated boards), and stairs above the decking.

[0023] like Figure 5 As shown, the construction process of the three-layer segment includes, after making the tire frame, completing the splicing and welding of the main beam structure and the secondary beam structure, and then positioning and welding the node plate therein, and then welding the decking on top, and positioning and welding the columns, vertical walls (corrugated boards), and stairs on the decking.

[0024] like Figure 6 As shown, the construction process of the second-floor segment includes, after making the tire frame, completing the splicing and welding of the main beam structure and the secondary beam structure, and then positioning and welding the node plate therein, and then welding the decking on top, and positioning and welding the columns, vertical walls (corrugated boards), and stairs on the decking.

[0025] like Figure 7 As shown, the construction process of a first-floor segment includes welding columns, vertical walls (corrugated panels) and stairs on the transition segment 1 after turning over.

[0026] Then the final assembly begins, including: Step S2, such as Figure 8 As shown, the prefabricated roof layer (prefabricated) is hoisted to the top of the four-layer segment (prefabricated), and then welded and fixed to each other after positioning, and then the corresponding enclosure surface is welded (the exposed position at the bottom of the node plate is reserved for easy positioning); Step S3, such as Fig. 9 As shown, hoist the prefabricated roof layer and the four-layer segment as a whole to the top of the three-layer segment (prefabricated), weld them together after positioning, and then weld the corresponding enclosure surface (reserve the exposed position at the bottom of the node plate for easy positioning); Step S4, repeat the above steps to install downward until the last layer is installed on the segment, and the corresponding enclosure surface is welded to complete the installation; in this embodiment, it is specifically as follows: like Fig.10 As shown, the prefabricated roof layer, the four-layer segment as a whole and the three-layer segment are hoisted to the top of the second-layer segment (prefabricated), and then welded and fixed to each other after positioning, and then welded to the corresponding enclosure surface (the exposed position at the bottom of the node plate is reserved for easy positioning); like Fig.11As shown, the prefabricated roof layer, the four-layer segment as a whole, the three-layer segment and the two-layer segment are hoisted to the top of the first-layer segment (prefabricated), positioned and welded to each other, and then the corresponding enclosure surface (connected to the first-layer deck) is welded.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A new type of offshore equipment cabin transition section structure, characterized by: It includes a transition segment, the top of which is connected to a prefabricated structure, the prefabricated structure includes several prefabricated segmented structures, the top of the prefabricated structure is also connected to a prefabricated roof layer, the periphery of the prefabricated structure is also provided with an external wall surface, the segmented structure includes several columns and vertical walls, and equipment installation positions are reserved on the inner or outer sides of the vertical walls; several lifting ears are fixed on the prefabricated roof layer, and the prefabricated roof layer and the segmented structure below it are hoisted to the top of other segmented structures through the lifting ears for welding.

2. A novel offshore equipment cabin transition section structure according to claim 1, characterized in that: The transition segment, each segment structure and the prefabricated roof layer are fixed by welding.

3. A novel offshore equipment cabin transition section structure according to claim 1 or 2, characterized in that: The outer wall surface includes a plurality of enclosure surfaces, and the enclosure surfaces are fixed to the outer periphery of the corresponding segmented structure.

4. A novel offshore equipment cabin transition section structure according to claim 1, characterized in that: The segmented structure also includes a segmented node plate positioned and fixed at the bottom, and the column is fixed at a position just above the corresponding segmented node plate. The segmented structure is positioned and welded to the adjacent segmented structure through the segmented node plate.

5. A method for constructing a novel offshore equipment cabin transition section structure according to any one of claims 1 to 4, characterized in that: The following steps are included: Step S1, firstly make transition segments, each segment structure and prefabricated roof layer, wherein each segment structure is first-layer segment, second-layer segment, ... N-layer segment from bottom to top; Step S2, hoisting the prefabricated roof layer to the top of the N-layer segment, welding them together after positioning, and then welding the corresponding enclosure surface; Step S3, hoisting the prefabricated roof layer and the N-layer segment as a whole to the top of the N-1-layer segment, welding them to each other after positioning, and then welding the corresponding enclosure surface; Step S4, repeat the above steps to install downwards until the last layer is installed on a segment, and the corresponding enclosure surface is welded to complete the installation.

6. The method for constructing a novel offshore equipment cabin transition section structure according to claim 5 is characterized by: Once the transition segment is built, it is turned over and a layer of segments is built directly on top of it.

7. A method for constructing a novel offshore equipment cabin transition section structure according to claim 5 or 6, characterized in that: The construction process of the transition section includes making the bottom plate, installing the internal stiffeners and the outer cylinder on the bottom plate, and then installing several box girders located outside the cylinder on the bottom plate, and finally installing the top ring plate on the upper side of the box girder and the flange on the upper side of the cylinder.

8. The method for constructing a novel offshore equipment cabin transition section structure according to claim 6 is characterized by: The construction process of the first-floor segment includes welding columns and vertical walls on the transition segment after turning over.

9. The method for constructing a novel offshore equipment cabin transition section structure according to claim 5 is characterized by: The construction process of two-story sections, three-story sections...N-story sections includes the splicing and welding of the main beam structure and the secondary beam structure, and then positioning and welding the node plates therein, followed by welding the decking on top, and positioning and welding the columns and vertical walls above the decking.

10. A method for constructing a novel offshore equipment cabin transition section structure according to claim 5 or 9, characterized in that: The construction process of the prefabricated roof layer includes the splicing and welding of the main beam structure and the secondary beam structure, and then positioning and welding the node plate therein, and then welding the decking on top, and welding the lifting lugs on top of the decking.

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