Segmented assembly method for trunk

Abstract

The invention provides a trunk subsection assembly method which comprises the steps that the upper end faces of longitudinal wall plate sheets are placed upwards, and a first hoisting assembly set is hoisted from top to bottom to be fixed to the upper end faces of the longitudinal wall plate sheets; the lower end faces of the longitudinal wall plate sheets are placed upwards, and the sheet-shaped second hoisting assembly sets are stacked on the two sides of the longitudinal wall plate sheets correspondingly; the first inclined plate sheet body on one side is hoisted on the lower end face, and the inclined plate sheet bodies are supported through part of assemblies concentrated by the second hoisting assembly, so that the inclined plate sheet bodies have a certain inclination; hoisting the lower pile fixing frame component; the second inclined plate sheet body on the other side is hoisted on the lower end face; and the hoisting top plate and the bottom plate are assembled on the periphery to form side-lying trunk sections. By means of the trunk segmented assembly method, the design requirement and the process requirement of the trunk for the continuous deck are met, and the technical problem that in the prior art, an assembly method based on the continuous deck and an existing designed ocean platform structure is lacked is solved.

Description

Technical Field:

[0001] The present invention relates to the field of design of sectional structures of cofferdams, and particularly to a method for assembling sectional cofferdams. Background Art:

[0002] In the "CCS Rules for Classification of Mobile Offshore Units 2020 Edition", in Section 2, 1.2.1.7, the freeboard deck is defined as: the highest continuous exposed deck on the platform, with all exposed openings thereon provided with permanent closing devices, and all external openings below it provided with permanent watertight closing devices. 1.2.1.8 The bulkhead deck is defined as: the continuous deck up to which the watertight transverse bulkheads extend.

[0003] In the "CCS Rules for Classification of Steel Sea-Going Ships 2021 Edition", in Section 2, 1.1.2.6, the upper continuous deck is defined as: the highest continuous deck of the hull. It can be seen that for existing steel sea-going ships and offshore platforms, the highest continuous exposed deck is the main structure of the ship, and the current structural arrangement is that the decks are continuous and the wall panels are discontinuous.

[0004] There is an urgent need for a method for assembling sectional cofferdams, which helps to solve the technical problem in the prior art that there is a lack of an assembly method based on continuous decks and the structures of existing designed offshore platforms. Summary of the Invention:

[0005] In one embodiment, the present invention provides a method for assembling sectional cofferdams. By the method of assembling sectional cofferdams, it meets the design requirements and process requirements for continuous decks, and helps to solve the technical problem in the prior art that there is a lack of an assembly method based on continuous decks and the structures of existing designed offshore platforms.

[0006] The method for assembling sectional cofferdams includes:

[0007] Place the upper end face of the longitudinal wall panel sheet upward, and hoist and fix the first hoisting component set from top to bottom on the upper end face of the longitudinal wall panel sheet;

[0008] Place the lower end face of the longitudinal wall panel sheet upward, and stack the sheet-like second hoisting component sets on both sides respectively;

[0009] Hoist one side of the first inclined plate body on the lower end face, and support the first inclined plate body by some components in the second hoisting component set to make it have a certain slope;

[0010] Hoist the lower fixing pile frame component;

[0011] Hoist the other side of the second inclined plate body on the lower end face;

[0012] Hoist and assemble the top plate and the bottom plate to form a lying sectional cofferdam around.

[0013] In one embodiment, after the hoisting top plate and bottom plate are assembled to form a side-lying cofferdam section around the perimeter, the method further includes:

[0014] Position the top plate and bottom plate of the cofferdam section above and below.

[0015] Assemble and weld the upper fixing frame for fixation.

[0016] In one embodiment, the closing opening of the upper fixing pile frame and the lower fixing pile frame is 835 millimeters below the main deck.

[0017] In one embodiment, before the step of assembling and welding the upper fixing frame for fixation, the method further includes:

[0018] The gusset plate is fabricated along with the cofferdam section.

[0019] In one embodiment, after the step of assembling and welding the upper fixing frame for fixation, the method further includes:

[0020] The cofferdam section is set at a predetermined position on the wind power installation platform for fixation.

[0021] In one embodiment, three groups of the cofferdam sections are arranged around the perimeter of the predetermined position.

[0022] In one embodiment, after the step of setting the cofferdam section at a predetermined position on the wind power installation platform for fixation, the method further includes:

[0023] In one embodiment, the top plate forms a continuous deck. Description of the Drawings:

[0024] Figure 1 It is a schematic flow chart of a method for assembling a cofferdam section in an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall assembly structure of the cofferdam section in another embodiment of the present invention.

[0026] Reference Numerals:

[0027] Vertical wall plate sheet 1

[0028] Upper end face 11

[0029] First hoisting component set 2

[0030] Second hoisting component set 3

[0031] First inclined plate sheet body 4

[0032] Lower end face 41

[0033] Lower fixing pile frame component 5

[0034] Second inclined plate body 6

[0035] Lifting top plate 7

[0036] Bottom plate 8

[0037] Gusset plate 9

[0038] Cofferdam section 10

[0039] Upper pile fixing frame 20

[0040] Lower pile fixing frame 30 Specific embodiments:

[0041] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] Reference is made herein to the various aspects and features of the present application in connection with the accompanying drawings.

[0043] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments given by way of non-limiting examples with reference to the accompanying drawings.

[0044] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present application, which have the features as described in the claims and thus are all within the scope of protection defined thereby.

[0045] When considered in conjunction with the accompanying drawings, the above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description.

[0046] Specific embodiments of the present application are hereinafter described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present application and can be implemented in various ways. Well-known and / or repetitive functions and structures have not been described in detail to determine the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but are merely used as a basis for the claims and a representative basis for teaching those skilled in the art to use the present application in substantially any suitable detailed structure in a variety of ways.

[0047] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", each of which may refer to one or more of the same or different embodiments of the present application.

[0048] For a jack-up platform, it mainly consists of a platform main body, leg columns, pile shoes, a lifting system, etc. Among them, the pile fixing frame is a strong structure that connects the leg columns and the well cell and transmits loads; it is also the carrier of the lifting system and provides guidance for the lifting of the leg columns.

[0049] During the platform lifting process, the leg columns are connected through the lifting system inside the pile fixing frame, and force is transmitted. Then the load is transmitted to the platform main body. Therefore, the components connecting the pile fixing frame and the platform main body deck are high-stress areas.

[0050] If designed according to the traditional continuous deck method, the load transmission effect is discounted, stress concentration is likely to occur at the welds, fatigue cracks are likely to be generated, and the service life of the components is affected.

[0051] In order to ensure the structural form in which the components connecting the pile fixing frame and the platform main body are continuous and the main deck is disconnected, while meeting the requirements of double-sided structure, segmented ultra-wide and ultra-high, and high precision requirements for the lower pile fixing frame, a method for fabricating the well cell in segments is adopted.

[0052] Figure 1 Schematic diagram of the process of a method for assembling the well cell in segments in an embodiment of the present invention; Figure 2 Schematic diagram of the overall assembled structure of the segmented well cell structure in another embodiment of the present invention.

[0053] As Figure 1 and Figure 2 shown, in an embodiment, the present invention provides a method for assembling the well cell in segments, and the method for assembling the well cell in segments includes:

[0054] Place the upper end surface of the longitudinal wall plate sheet 1 facing up on 11, and hoist and fix the first hoisting component set 2 from top to bottom on the upper end surface 11 of the longitudinal wall plate sheet 1;

[0055] Place the lower end surface 11 of the longitudinal wall plate sheet 1 facing up, and stack the sheet-shaped second hoisting component sets 3 on both sides respectively;

[0056] Hoist the first inclined plate body 4 on the lower end surface 41, and support the first inclined plate body 4 through some components in the second hoisting component set 3 to make it have a certain slope;

[0057] Hoist the lower pile fixing frame component 5;

[0058] Hoist the second inclined plate body 6 on the other side on the lower end surface;

[0059] Hoist the top plate 7 and the bottom plate 8 and assemble them around to form a lying well cell segment 10.

[0060] In this embodiment, a specific implementation manner of a cofferdam segmented assembly method is provided. Based on the structure of the continuous deck, an assembly method for this structure is proposed, which helps to solve the technical problem that there is a lack of an assembly method based on the continuous deck and the existing designed offshore platform structure in the prior art.

[0061] In one embodiment, after the steps of hoisting the top plate 8 and the bottom plate assembly 8 to form a cofferdam segment 10 lying on its side around, the method further includes:

[0062] Place the top plate and the bottom plate 8 of the cofferdam segment 10 above and below.

[0063] Assemble the upper fixing pile frame 20 and weld and fix it.

[0064] In this embodiment, the assembly of the top plate and the bottom plate structure is provided.

[0065] In one embodiment, the closing opening of the upper fixing pile frame 20 and the lower fixing pile frame 30 is 835 millimeters below the main deck.

[0066] This dimension will affect the strength of the overall structure of the dividing line.

[0067] In one embodiment, before the step of assembling and welding and fixing the upper fixing pile frame, the method further includes:

[0068] The bracket 9 is fabricated along with the cofferdam segment 10.

[0069] In one embodiment, after the step of assembling and welding and fixing the upper fixing pile frame, the method further includes:

[0070] The cofferdam segment 10 is arranged at a predetermined position on the wind power installation platform and fixed.

[0071] In one embodiment, three groups of the cofferdam segments 10 are arranged in a circle around the predetermined position.

[0072] In one embodiment, after the step of fixing the cofferdam segment 10 at a predetermined position on the wind power installation platform, the method further includes:

[0073] In one embodiment, the top plate 7 forms a continuous deck.

[0074] Compared with the traditional structural form, the fillet weld at the bracket and the deck is in a high stress area, and it is easy to be damaged due to the force during use, and the weld will generate fatigue cracks. The prior art adopts a design form in which the fixing pile frame brackets are continuous and the deck is disconnected. The fixing pile frame brackets are structures in the high stress area. The load can be directly conducted along the continuous direction of the brackets to the cofferdam structure, reducing the stress concentration of the weld, reducing the possibility of fatigue, and providing the service life of the component.

[0075] This assembly method can: ① meet the requirement that the connecting gusset plate of the fixed pile frame extends out of the deck surface; ② build the sectional block in a proper posture, effectively control the height of the sectional block in the shed, facilitate transportation, and reduce safety risks; ③ effectively control the height of the base surface, and control the height of the jig within 2 m during the construction process to meet the on-site production conditions.

[0076] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A method for assembling a well enclosure in sections, characterized in that: The segmented assembly method for the well enclosure comprises: The upper end surface (11) of the longitudinal wall plate (1) is placed upward, and a first lifting assembly (2) is lifted from top to bottom and fixed on the upper end surface (11) of the longitudinal wall plate (1); The lower end surface (11) of the longitudinal wall plate (1) is placed upwards, and the second hanging component set (3) in sheet form is stacked on both sides; The first inclined plate body (4) on one side of the hoisting device is on the lower end surface (41), and the first inclined plate body (4) is supported by some components in the second hoisting component set (3) so as to have a certain slope; Lifting the lower pile fixing frame component (5); The second inclined plate body (6) on the other side is hoisted on the lower end surface (41); The top plate (7) and the bottom plate (8) are hoisted and assembled around to form a side-lying well enclosure segment (10).

2. The method for assembling a well enclosure in sections according to claim 1, characterized in that: After the step of assembling the top plate (7) and the bottom plate (8) around to form a side-lying well enclosure segment (10), the method further comprises: Place the top plate and bottom plate (8) of the well enclosure segment (10) upward and downward; Assemble the fixed frame (20) and weld and fix it.

3. The method for assembling a well enclosure in sections according to claim 2, characterized in that: The closing opening of the upper pile fixing frame (20) and the lower pile fixing frame (30) is 835 mm below the main deck.

4. The method for assembling a well enclosure in sections according to claim 3, characterized in that: Before the step of assembling and welding the fixed frame (20), the method further comprises: The toggle plate (9) is manufactured along with the well surrounding sections (10).

5. The method for assembling the well enclosure in sections according to claim 4, characterized in that: After the step of assembling and welding the fixed frame (20), the method further comprises: The shaft enclosure segment (10) is arranged and fixed at a predetermined position of the wind power installation platform.

6. The method for assembling a well enclosure in sections according to claim 5, characterized in that: Three groups of well surrounding segments (10) are arranged around the predetermined position.

7. The method for assembling a well enclosure in sections according to claim 6, characterized in that: After the step of fixing the well enclosure segment (10) at a predetermined position on the wind power installation platform, the method further comprises: The installation pile legs are meshed with the gearbox gears on the well enclosure section through the rack structure above.

8. The method for assembling a well enclosure in sections according to claim 7, characterized in that: The top plate (7) forms a continuous deck.

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