Segmented division and construction method for trunk of wind power installation vessel

Abstract

The invention provides a sectional division and construction method for a trunk of a wind power installation vessel. The sectional division and construction method comprises the following steps of overall division of a trunk area, wherein the trunk area extends backwards in the stern direction and is fractured outside the transverse wall of the stern, the trunk area extends forwards in the bow direction and is fractured outside the transverse wall of the bow, and the trunk area extends inwards in the midship direction and is fractured outside the longitudinal wall; subdivision of the trunk area structure: dividing the trunk area structure according to a longitudinal boundary and a transverse boundary to obtain a trunk section I, a trunk section II, a trunk section III and a trunk section IV; a first trunk section, a second trunk section, a third trunk section and a fourth trunk section are built respectively; independently building a lower pile fixing frame section; the upper fracture of the lower pile fixing frame subsection is above the main deck, and the lower fracture of the lower pile fixing frame subsection directly abuts against a bottom plate of the trunk area structure; closing the trunk section I, the trunk section II, the trunk section III and the trunk section IV to obtain a trunk area structure; the multiple lower pile fixing frame sections are folded to obtain a lower pile fixing frame; and the lower pile fixing frame is hoisted and folded to the trunk area structure in a segmented mode.

Description

Technical Field

[0001] The present invention relates to the technical field of ocean engineering, and particularly relates to a method for dividing and constructing a caisson section of a wind power installation vessel. Background Art

[0002] In recent years, with the continuous expansion of the scale of offshore wind turbines, the power, size, and weight of wind turbines have been continuously increasing. Currently, large offshore self-elevating platforms or wind power installation vessels all adopt triangular truss-type pile legs, and the external shape structure of the caisson area corresponding to the hull is an irregular special-shaped structure, which has the characteristics of large structural weight, high steel plate material quality, large plate thickness, and difficult control of the accuracy of special-shaped top and bottom plates. In addition, a wear-resistant plate with extremely high precision is required to strengthen the foundation structure area. When constructed according to the traditional integral caisson, there are problems such as weak sectional rigidity, overweight hoisting, high hoisting cost, and great hoisting difficulty. If constructed integrally, a large number of machining operations in the wear-resistant plate steel structure foundation area of the pile leg lifting channel need to be carried out on-site when the structure is standing, which has the disadvantages of great difficulty in accuracy control, great machining difficulty, and high cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for dividing and constructing a caisson section of a wind power installation vessel to solve the problems in the prior art.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: A method for dividing and constructing a caisson section of a wind power installation vessel, the wind power installation vessel includes a hull and caisson area structures arranged at the four corners of the hull;

[0005] The method for dividing and constructing the caisson section of the wind power installation vessel includes the following steps:

[0006] Overall division of the caisson area: Extend backward towards the stern of the ship and make a break outside the stern transverse wall, extend forward towards the bow of the ship and make a break outside the bow transverse wall, extend inward towards the midship of the ship and make a break outside the longitudinal wall, and ensure the integrity of the respective cabin structures;

[0007] Subdivision of the caisson area structure: Divide the caisson area structure according to the longitudinal demarcation line and the transverse demarcation line to obtain caisson section one, caisson section two, caisson section three, and caisson section four. The longitudinal demarcation line is located inside the transverse direction of the two outer lower pile fixing frames, and the extension line of the longitudinal demarcation line does not pass through the cabin adjacent to the caisson area. The projection of the transverse demarcation line is within the projection range of the inner lower pile fixing frame;

[0008] Construct the caisson section one, the caisson section two, the caisson section three, and the caisson section four respectively;

[0009] Independently construct the lower pile fixing frame section; the upper fracture of the lower pile fixing frame section is above the main deck, and the lower fracture reaches directly to the bottom plate of the cofferdam area structure;

[0010] Close the cofferdam section one, the cofferdam section two, the cofferdam section three, and the cofferdam section four to obtain the cofferdam area structure;

[0011] Lift and close the lower pile fixing frame section onto the cofferdam area structure.

[0012] In one implementation, the cofferdam area extends at least 2 m rearward in the stern direction of the ship, at least 2.6 m forward in the bow direction of the ship, and at least 1.1 m inward in the midship direction of the ship.

[0013] In one implementation, the construction of the cofferdam section one includes the following steps: using the longitudinal wall erection plate as a jig, sequentially assemble the transverse wall erection, deck erection, intermediate deck erection, single installation of the ship bottom plate, cofferdam bottom plate, bottom peripheral vertical plate, and cofferdam inner circumferential wall plate.

[0014] In one implementation, the construction of the cofferdam section two and the cofferdam section three includes the following steps: using the outer plate as a jig, sequentially assemble the transverse wall erection, deck erection, intermediate deck erection, single installation of the ship bottom plate, cofferdam bottom plate, bottom peripheral vertical plate, and cofferdam inner circumferential wall plate.

[0015] In one implementation, the construction of the cofferdam section four includes the following steps: using the deck as a jig, sequentially assemble the transverse wall erection, deck erection, intermediate deck erection, single installation of the ship bottom plate, cofferdam bottom plate, bottom peripheral vertical plate, and cofferdam inner circumferential wall plate.

[0016] In one implementation, after the cofferdam section one, the cofferdam section two, the cofferdam section three, and the cofferdam section four are respectively constructed, spray painting work is carried out respectively, and then closing is carried out.

[0017] In one implementation, after the lower pile fixing frame section is constructed, vibratory stress relief is carried out, then the structural base plate for installing the wear-resistant plate on the lower pile fixing frame section is machined, and then spray painting work is carried out.

[0018] In one implementation, the upper fracture of the lower pile fixing frame section is at a position 300 - 500 mm above the main deck.

[0019] In one implementation, before lifting and closing the lower pile fixing frame section onto the cofferdam area structure, the following steps are also included:

[0020] Integrate the cofferdam area structure with the hull and close them into a whole.

[0021] In one of the embodiments, after the lower pile fixing frame is hoisted in sections and closed to the cofferdam area structure, the following steps are further included:

[0022] The upper pile fixing frame is closed in sections above the lower pile fixing frame;

[0023] The pile legs are closed to the pile shoes within the cofferdam area.

[0024] It can be seen from the above technical solutions that the present invention has at least the following advantages and positive effects:

[0025] By extending the break between the cofferdam area and the hull outwards during construction and combining the corresponding sectional construction method, the present invention ensures the integrity of the functional area of the cofferdam strengthening and intensive structure, greatly reduces the difficulty of sectional construction of the cofferdam, ensures the sectional construction accuracy, improves the structural rigidity of sectional construction, hoisting and transportation, enables the cofferdam sections to be produced according to the production and construction rhythm of each process workshop, saves time and improves production efficiency. By separating the lower pile fixing frame sections from the cofferdam area, a large number of bulk structures are avoided, the construction and closing construction difficulty of the cofferdam and the lower pile fixing frame sections are reduced, the closing efficiency and quality of the lower pile fixing frame sections are improved, which is beneficial to the accuracy control of sectional construction, and greatly shortens the overall construction period of the lower pile fixing frame sections' construction and machining. Moreover, the division method of the cofferdam area and the lower pile fixing frame sections enables the parallel construction of the cofferdam and the lower pile fixing frame sections. The closing of the cofferdam sections is no longer restricted by the construction and machining cycle of the lower pile fixing frame sections, greatly shortening the overall closing construction period of the project, reducing the construction cost, improving the shipbuilding quality and improving the construction environment. Description of the Drawings

[0026] Figure 1 is a distribution schematic diagram of the cofferdam area on the jack-up wind power installation ship in the present invention.

[0027] Figure 2 is a distribution schematic diagram of the cofferdam area on the jack-up wind power installation ship at the main deck layer in the present invention.

[0028] Figure 3 is a distribution schematic diagram of the cofferdam area on the jack-up wind power installation ship at the middle deck layer in the present invention.

[0029] Figure 4 is a top view of the division of a single cofferdam area on the starboard side of the ship's stern in the cofferdam area in the present invention.

[0030] Figure 5 is a schematic diagram of multiple cofferdam sections in the present invention.

[0031] Figure 6 is a side view of the division of the cofferdam outer plate on the starboard side of the stern in the cofferdam area in the present invention.

[0032] Figure 7It is a side view of the division of the main longitudinal wall in a single cofferdam area on the starboard side of the stern in the present invention.

[0033] Figure 8 It is a schematic diagram of the erection sequence of the sectional construction of the first cofferdam section in the present invention.

[0034] Figure 9 It is a schematic diagram of the structure of the first cofferdam section in the present invention.

[0035] Figure 10 It is a schematic diagram of the structure of the second cofferdam section in the present invention.

[0036] Figure 11 It is a schematic diagram of the structure of the third cofferdam section in the present invention.

[0037] Figure 12 It is a schematic diagram of the structure of the fourth cofferdam section in the present invention.

[0038] Figure 13 It is a schematic diagram of the positional relationship between the lower pile fixing frame section and the pile leg in the present invention.

[0039] Figure 14 It is a top view of the three lower pile fixing frame sections in the present invention.

[0040] Figure 15 It is a schematic diagram of the structure of the three lower pile fixing frame sections in the present invention.

[0041] Figure 16 It is a schematic diagram of the structure of the lower pile fixing frame section in the present invention.

[0042] Figure 17 It is a schematic diagram of the structure after the closure of the cofferdam sections in the present invention.

[0043] Figure 18 It is a schematic diagram of the structure after the closure of the structure of the cofferdam area and the lower pile fixing frame section in the present invention.

[0044] Figure 19 It is a schematic diagram of the structures of the upper foundation section, the lower pile fixing frame section, the cofferdam section, the pile leg and the pile shoe in the present invention.

[0045] The descriptions of the reference numerals are as follows:

[0046] 11. Hull; 12. Well area; 121. First well section; 122. Second well section; 123. Third well section; 124. Fourth well section; 131. Lower pile fixing frame section; 1311. Structural base plate; 1312. Reinforcing structure; 14. Leg; 151. Longitudinal wall erection plate; 152. Transverse wall erection; 153. Deck erection; 154. Intermediate deck erection; 155. Bottom plate; 156. Well bottom plate; 157. Bottom peripheral vertical plate; 158. Inner well enclosure wall plate; 159. Outer plate; 16. Upper pile fixing frame section; 17. Pile shoe. Detailed implementation mode

[0047] Although the present invention can be easily embodied in different forms of embodiments, only some specific embodiments are shown in the drawings and will be described in detail in this specification. At the same time, it can be understood that this specification should be regarded as a demonstration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0048] Therefore, a feature pointed out in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined to show a possible system design, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to be limiting.

[0049] In the embodiments shown in the drawings, the indication of directions (such as up, down, left, right, front and back) is used to explain that the structures and movements of various elements of the present invention are not absolute but relative. When these elements are in the positions shown in the drawings, these descriptions are appropriate. If the descriptions of the positions of these elements change, then the indication of these directions also changes accordingly.

[0050] Currently, usually after dividing the well into four well sections, the limiting area of the leg rack biased towards the well center of the well is then used to add a large number of structures for scattered fractures to make it into a lower pile fixing frame section. However, since the integrity of the midship compartments on one side of the ship needs to be ensured, therefore, the lower pile fixing frame section is used to make the well into a connecting section. The inner side of the well section formed by the above division method facing the well center direction has many exposed structures, weak rigidity, difficult control of the construction accuracy of the section, and easy deformation during construction hoisting and turning over. On the outer side of the lower pile fixing frame section facing away from the well center, there are a large number of bulk structures, resulting in a large weight, large size, difficult structural positioning accuracy and welding, and a large amount of work for closing with the well section.

[0051] Meanwhile, due to the large number of bulk structures in the cofferdam and the lower fixed pile frame in corresponding segments, when the lower fixed pile frame segments are hoisted and inserted into the cofferdam, there are disadvantages such as great difficulty in hoisting construction and structural assembly, long hoisting closing cycle, and high cost.

[0052] Therefore, the inventor of the present application, in combination with the hull line change and the structural characteristics of the intensively strengthened structure part of the cofferdam, creatively proposed a construction method. By extending the break between the cofferdam area and the hull outward during construction and combining the corresponding segmented construction method, the integrity of the functional area of the intensively strengthened structure of the cofferdam is ensured, the construction difficulty of the cofferdam segments is greatly reduced, while ensuring the segmented construction accuracy, the structural rigidity of segmented construction, hoisting, and transportation is improved, enabling the cofferdam segments to be produced according to the production and construction rhythm of each process workshop, saving time and improving production efficiency. By separating the lower fixed pile frame segments from the cofferdam area, a large number of bulk structures are avoided, the construction and closing construction difficulty of the cofferdam and the lower fixed pile frame segments are reduced, the closing efficiency and quality of the lower fixed pile frame segments are improved, which is beneficial to the accuracy control of segmented construction, and the overall construction cycle of the lower fixed pile frame segments' construction and machining is greatly shortened. Moreover, the division method of the cofferdam area and the lower fixed pile frame segments enables the parallel construction of the cofferdam and the lower fixed pile frame segments. The closing of the cofferdam segments is no longer restricted by the construction and machining cycle of the lower fixed pile frame segments, greatly shortening the overall closing construction cycle of the project, reducing the construction cost, improving the shipbuilding quality, and improving the construction environment.

[0053] Among them, the wind power installation ship includes a hull and cofferdam area structures arranged at the four corners of the hull. Three fixed pile frame segments are provided below each cofferdam area. The three fixed pile frame segments are two outer lower fixed pile frame segments close to the hull's side and one inner lower fixed pile frame segment located inside the outer lower fixed pile frame segments.

[0054] The jack-up wind power installation ship includes pile legs and pile shoes corresponding to the pile legs. A lifting channel for the corresponding pile legs to lift is provided in the cofferdam area. The pile shoes are located at the bottom of the pile legs.

[0055] The following specifically introduces the cofferdam segment division and construction method of this wind power installation ship (hereinafter referred to as the construction method).

[0056] This construction method includes the following steps:

[0057] S1. Overall division of the cofferdam area 12: Extend backward towards the stern and make a break outside the stern transverse wall, extend forward towards the bow and make a break outside the bow transverse wall, extend inward towards the ship's midsection and make a break outside the longitudinal wall, and ensure the integrity of the respective cabin structures.

[0058] Among them, the division of the cofferdam area 12 refers to the division of the entire wind power installation ship during use according to the division criteria in relevant technologies. When determining the fracture position in this application, after dividing the hull 11 and the cofferdam area 12 according to the division criteria in relevant technologies, it extends towards the stern direction, the bow direction, and the midship direction, thereby changing the fracture position. For details, please refer to Figures 1 - 3 。

[0059] The division of this fracture can be designed on the design drawings of shipbuilding. In Figure 2 , in the dotted box in the upper left corner, the position where the line with an arrow is located is the fracture. In other figures, the fractures of the cofferdam area 12 are all indicated by lines with arrows.

[0060] Preferably, the cofferdam area 12 extends at least 2 m towards the stern direction. The cofferdam area 12 extends at least 2.6 m towards the bow direction. The cofferdam area 12 extends at least 1.1 m towards the midship direction.

[0061] The selection of the fracture position is mainly to ensure the integrity of the respective cabin structures, and at the same time, it also ensures reducing the construction volume of the closure joint and improving the construction environment.

[0062] S2. Subdivision of the cofferdam area structure: The structure of the cofferdam area 12 is divided according to the longitudinal dividing line and the transverse dividing line to obtain cofferdam section one 121, cofferdam section two 122, cofferdam section three 123, and cofferdam section four 124. The longitudinal dividing line is located on the transverse inner side of the two outer lower pile fixing frame sections 131, and the extension line of the longitudinal dividing line does not pass through the cabins adjacent to the cofferdam area 12. The projection of the transverse dividing line is within the projection range of the inner lower pile fixing frame section 131.

[0063] That is, on the basis of the previous step, the re-divided structure is adopted with the cross method to obtain four cofferdam sections.

[0064] Similarly, the division of the four cofferdam sections is designed on the design drawings of shipbuilding.

[0065] After being divided into four cofferdam sections, since the four cofferdam sections can be built separately, the construction difficulty is greatly reduced. While ensuring the sectional construction accuracy, the structural rigidity of sectional construction, hoisting, and transportation is improved, realizing the lean shipbuilding of "hull, outfitting, and painting integration" and "modularization" for the cofferdam sections, enabling the cofferdam sections to be produced according to the production and construction rhythm of each process workshop, and improving the production efficiency.

[0066] Through this innovative sectional division technology, the cost of renting additional large auxiliary cranes due to overweight sections is avoided. And the innovation of this sectional division ensures the integrity of the scarf sections and greatly reduces the closure operation volume.

[0067] Combined with Figures 4 - 7, in this embodiment, the first cofferdam section 121 and the fourth cofferdam section 124 are arranged in sequence along the longitudinal direction and are close to the ship's midship. Along the longitudinal direction, the first cofferdam section 121 is far from the center of the hull 11, and the fourth cofferdam section 124 is close to the center of the hull 11. The second cofferdam section 122 and the third cofferdam section 123 are arranged in sequence along the longitudinal direction and are both located on the side of the hull 11. The first cofferdam section 121 is correspondingly arranged inside the second cofferdam section 122 transversely, and the fourth cofferdam section 124 is correspondingly arranged inside the third cofferdam section 123.

[0068] S3. Respectively construct the first cofferdam section 121, the second cofferdam section 122, the third cofferdam section 123 and the fourth cofferdam section 124.

[0069] After the division of the foregoing steps, then construct respectively according to the above division.

[0070] Refer to Figure 8 , the construction of the first cofferdam section 121 includes the following steps: Using the longitudinal wall erection plate 151 as a mold, sequentially assemble the transverse wall erection 152, the deck erection 153, the intermediate deck erection 154, the single ship bottom plate 155, the cofferdam bottom plate 156, the bottom peripheral vertical plate 157 and the cofferdam inner enclosure wall plate 158. The constructed first cofferdam section 121 is as Figure 9 shown.

[0071] The construction of the second cofferdam section 122 and the third cofferdam section 123 includes the following steps: Using the outer plate 159 as a mold, sequentially assemble the transverse wall erection 152, the deck erection 153, the intermediate deck erection 154, the single ship bottom plate 155, the cofferdam bottom plate 156, the bottom peripheral vertical plate 157 and the cofferdam inner enclosure wall plate 158. The constructed second cofferdam section 122 is as Figure 10 shown. The constructed third cofferdam section 123 is as Figure 11 shown.

[0072] The construction of the fourth cofferdam section 124 includes the following steps: Using the deck as a mold, sequentially assemble the transverse wall erection 152, the deck erection 153, the intermediate deck erection 154, the single ship bottom plate 155, the cofferdam bottom plate 156, the bottom peripheral vertical plate 157 and the cofferdam inner enclosure wall plate 158. The constructed fourth cofferdam section 124 is as Figure 12 shown.

[0073] Since the construction of each cofferdam section can be carried out simultaneously in an independent workshop, and each cofferdam section can be constructed according to its own rhythm without interference with each other, time is saved and production efficiency is improved.

[0074] Furthermore, after the completion of the construction of the first cofferdam section 121, painting work is carried out. After the completion of the construction of the second cofferdam section 122, painting work is carried out. After the completion of the construction of the third cofferdam section 123, painting work is carried out. After the completion of the construction of the fourth cofferdam section 124, painting work is carried out.

[0075] That is, after the well surrounding section 1 121, the well surrounding section 2 122, the well surrounding section 3 123 and the well surrounding section 4 124 are respectively constructed, the spraying work is carried out respectively.

[0076] After the well surrounding section 1 121, the well surrounding section 2 122, the well surrounding section 3 123 and the well surrounding section 4 124 are all sprayed, they are then closed.

[0077] S4. The lower pile frame segment 131 is independently constructed; the upper fracture of the lower pile frame segment 131 is above the main deck, and the lower fracture directly reaches the bottom plate of the well surrounding area 12 structure.

[0078] Combination Figures 13 - 15 The number of the lower pile frame segments 131 is three. The three lower pile frame segments 131 are arranged corresponding to the three main legs of the pile leg 14.

[0079] See also Figure 16 The lower pile frame segment 131 is provided with a lifting and limiting structure base plate 1311 on which a wear-resistant plate is installed and a reinforcement structure 1312 around it.

[0080] Specifically, the upper fracture of the lower pile frame segment 131 is 300 to 500 mm above the main deck, that is, the top of the lower pile frame segment 131 exceeds the main deck by 300 to 500 mm.

[0081] After the lower pile frame segment 131 is constructed, vibration aging is performed, and then the structural base plate 1311 for installing the wear-resistant plate is machined on the lower pile frame segment 131, and then spraying is performed.

[0082] Vibration stress relief can be used to remove the structural internal stress of the lower pile frame segment 131 .

[0083] By extracting the lower pile frame segment 131 separately for construction, the lower pile frame segment 131 can also be constructed synchronously with the well surrounding segment, further saving time.

[0084] The withdrawal of the lower fixed pile frame segment 131 ensures the structural rigidity and integrity of the well surrounding segment to the greatest extent, and better ensures the structural dimensions of the well surrounding segment, and also provides a guarantee for the positioning accuracy dimensions of the alignment structure of the well surrounding segment and the lower fixed pile frame segment 131. Therefore, the withdrawal of the lower fixed pile frame segment 131 improves the construction accuracy of the well surrounding segment and the lower fixed pile frame segment 131, and improves the structural rigidity and integrity of the well surrounding segment.

[0085] At the same time, since the structure rigidity of the extracted lower pile frame segment 131 is sufficient, there are not too many scattered structures around the lower pile frame segment 131, so it is easier to construct and maintain the shape.

[0086] Among them, the dimensions of the positions of the large opening main structures such as the deck, the outer plate, and each transverse and longitudinal wall in the segmented cofferdam can be well guaranteed.

[0087] The cofferdam area structure is obtained by joining the closure of the cofferdam segment one 121, the cofferdam segment two 122, the cofferdam segment three 123, and the cofferdam segment four 124.

[0088] As Figure 17 shown, after the above-mentioned cofferdam segments are joined, a vertically penetrating lifting passage is formed in the middle. The lifting passage penetrates from the main deck of the hull 11 to the outer bottom plate of the cofferdam.

[0089] After the above-mentioned cofferdam segments are joined, the bottom plate at the bottom of the cofferdam area structure is arranged parallel and spaced from the top plate of the pile shoe, and the linear fold angle of the bottom plate is the same as the linear fold angle of the top plate of the pile shoe.

[0090] S6. Lift and join the lower pile fixing frame segment 131 to the cofferdam area structure.

[0091] As Figure 18 shown, lift the lower pile fixing frame segment 131 to the cofferdam area structure for joining operation.

[0092] Among them, before lifting and joining the lower pile fixing frame segment 131 to the cofferdam area structure, the following steps are further included:

[0093] Integrate the cofferdam area structure with the hull and join them together.

[0094] After integrating the cofferdam area structure with the hull and joining them together, the cofferdam area structure has higher integrity. At the same time, the hull has high strength and sufficient rigidity. At this time, lift and join the three lower pile fixing frame segments 131 respectively, which is more conducive to the positioning of the lower pile fixing frame segment 131 and the control of welding deformation, and ensures the relative position accuracy of the three lower pile fixing frame segments 131.

[0095] S7. Join the upper pile fixing frame segment above the lower pile fixing frame; join the pile leg to the pile shoe within the cofferdam area.

[0096] Refer to Figure 19 , and a lifting system is formed after joining.

[0097] During the joining process, due to the improvement of the self-precision of the cofferdam segment, the joining position, especially the inner opening, that is, the position accuracy of the inserted lower pile fixing frame is guaranteed. Therefore, first join the cofferdam segment, and then lift and join the lower pile fixing frame segment 131 to ensure the positioning position and precision data of the three lower pile fixing frame segments 131, laying a good precision foundation for the position degree, precision, and joining positioning of the upper pile fixing frame segment with a gearbox of the lifting system.

[0098] Combined with the above introduction, the construction method in the present invention has the following advantages:

[0099] 1. Creatively extend the break between the cofferdam area and the hull outward during construction, ensuring the integrity of the functional area of the cofferdam strengthening dense structure, thus reducing the precision requirements for the closing work, saving time and improving efficiency.

[0100] 2. After being divided into four cofferdam segments in the manner of this application, since the four cofferdam segments can be constructed separately, the construction difficulty is greatly reduced. While ensuring the precision of segment construction, the structural rigidity of segment construction, hoisting and transportation is improved, realizing the lean shipbuilding of "hull outfitting and painting integration" and "modularity" for the cofferdam segments, enabling the cofferdam segments to be produced according to the production and construction rhythm of each process workshop, and improving production efficiency.

[0101] Through this innovative segment division technology, the cost of renting additional large auxiliary cranes due to overweight segments is avoided. And this innovation in segment division ensures the integrity of the scarf segments and greatly reduces the closing operation volume.

[0102] 3. By separating the lower fixing pile frame segment from the cofferdam area, a large number of bulk structures are avoided, reducing the construction and closing construction difficulty of the cofferdam and the lower fixing pile frame segment, improving the closing efficiency and quality of the lower fixing pile frame segment, facilitating the precision control of segment construction, and greatly shortening the overall construction period of the lower fixing pile frame segment construction and machining.

[0103] 4. The division method of the cofferdam area and the lower fixing pile frame segment enables the parallel construction of the cofferdam and the lower fixing pile frame segment. The closing of the cofferdam segment is no longer restricted by the construction and machining cycle of the lower fixing pile frame segment, greatly shortening the overall closing construction period of the project, reducing the construction cost, improving the shipbuilding quality and improving the construction environment.

[0104] Exemplarily, the construction method in the present invention is applicable to the construction of the CRCC 2000-ton self-elevating wind power installation ship H606.

[0105] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for sectional division and construction of a cofferdam on a wind power installation vessel, characterized in that The wind power installation vessel includes a hull and well area structures arranged at the four corners of the hull; The method for segmenting and constructing the well area of the wind power installation vessel includes the following steps: Overall division of the well area: Extend rearward towards the stern and make a break outside the stern transverse wall, extend forward towards the bow and make a break outside the bow transverse wall, extend inward towards the ship's midsection and make a break outside the longitudinal wall, and ensure the integrity of the respective cabin structures; Subdivision of the well area structure: Divide the well area structure according to the longitudinal demarcation line and the transverse demarcation line to obtain Well Segment 1, Well Segment 2, Well Segment 3, and Well Segment 4. The longitudinal demarcation line is located on the transverse inner side of the two outer lower fixing pile frames, and the extension line of the longitudinal demarcation line does not pass through the cabins adjacent to the well area. The projection of the transverse demarcation line is within the projection range of the inner lower fixing pile frame; Construct Well Segment 1, Well Segment 2, Well Segment 3, and Well Segment 4 respectively; Independently construct the lower fixing pile frame segment; the upper break of the lower fixing pile frame segment is above the main deck, and the lower break reaches directly to the bottom plate of the well area structure; Close up Well Segment 1, Well Segment 2, Well Segment 3, and Well Segment 4 to obtain the well area structure; Lift and close up the lower fixing pile frame segment onto the well area structure.

2. The sectional division and construction method of the caisson of the wind power installation ship according to claim 1, characterized in that The well area extends rearward towards the stern by at least 2 m, extends forward towards the bow by at least 2.6 m, and extends inward towards the ship's midsection by at least 1.1 m.

3. The sectional division and construction method of the cofferdam of the wind power installation ship according to claim 1, characterized in that The construction of Well Segment 1 includes the following steps: Using the longitudinal wall erection plate as a mold, successively assemble the transverse wall erection, deck erection, intermediate deck erection, single-installed ship bottom plate, well bottom plate, bottom peripheral vertical plate, and well inner enclosure wall plate.

4. The sectional division and construction method of the caisson of the wind power installation vessel according to claim 1, characterized in that, The construction of Well Segment 2 and Well Segment 3 includes the following steps: Using the outer plate as a mold, successively assemble the transverse wall erection, deck erection, intermediate deck erection, single-installed ship bottom plate, well bottom plate, bottom peripheral vertical plate, and well inner enclosure wall plate.

5. The sectional division and construction method of the cofferdam of the wind power installation vessel according to claim 1, wherein The construction of Well Segment 4 includes the following steps: Using the deck as a mold, successively assemble the transverse wall erection, deck erection, intermediate deck erection, single-installed ship bottom plate, well bottom plate, bottom peripheral vertical plate, and well inner enclosure wall plate.

6. The sectional division and construction method of the caisson of the wind power installation vessel according to claim 1, characterized in that After Well Segment 1, Well Segment 2, Well Segment 3, and Well Segment 4 are respectively constructed, carry out spraying work respectively, and then carry out closing up.

7. The sectional division and construction method of the cofferdam of the wind power installation ship according to claim 1, characterized in that, After the lower fixing pile frame segment is constructed, carry out vibration aging, then machine the structural base plate for installing the wear-resistant plate on the lower fixing pile frame segment, and then carry out spraying work.

8. The sectional division and construction method of the cofferdam of the wind power installation vessel according to claim 1, characterized in that, The upper break of the lower fixing pile frame segment is at a position 300 - 500 mm above the main deck.

9. The sectional division and construction method of the caisson of the wind power installation ship according to claim 1, characterized in that, Before lifting and closing up the lower fixing pile frame segment onto the well area structure, it also includes the step of: Integrating the well area structure with the hull and closing them up as a whole.

10. The sectional division and construction method of the caisson of the wind power installation ship according to claim 1, characterized in that, After lifting and closing up the lower fixing pile frame segment onto the well area structure, it also includes the step of: Closing up the upper fixing pile frame segment above the lower fixing pile frame; Closing up the pile legs onto the pile shoes within the well area.

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