Construction method for subsections of bottom side cabin of liquefied gas ship

Abstract

The invention provides a construction method for subsections of a bottom side tank of a liquefied gas ship, which comprises the following steps of: firstly, dividing the subsections of the bottom side tank into three parts, namely an inclined plate middle group, a bottom plate middle group and a bilge curved middle group by taking a bilge linear change position as a boundary; thirdly, the three middle sets are manufactured respectively, and internal related outfitting pieces are pre-buried; and finally, the three parts are assembled in a normal state, butt joints are welded, bulk parts are installed, and internal outfitting parts are installed in place. According to the method, the construction height can be reduced, the scaffold erection workload is reduced, repeated scaffold erection is effectively avoided, and the labor cost is effectively saved; in addition, the installation precision is remarkably improved, and reworking caused by poor assembly precision is reduced; the division method of the bottom side tank sections is optimized, so that the construction difficulty is reduced; and finally, the three parts of the middle group are constructed at the same time, and parts assembled and welded in the large group stage in the traditional construction mode are moved forwards to the middle group stage, so that the construction time of the large group is greatly shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and specifically relates to a method for constructing a hopper tank segment of a liquefied gas ship. Background Art

[0002] The inner hull of a membrane-type liquefied gas carrier is the tank hull. Therefore, during the construction process, the flatness of the inner hull is required to be high. In order to ensure the flatness, the traditional construction method of the hopper tank has always been to use the inner hull as the base, install the longitudinal bones and ribs, and then hoist the straight outer plate middle group and the scattered curved outer plate. Figure 1 However, this construction method has the following disadvantages: 1) The construction height is relatively high. Taking a large natural gas as an example, if it is constructed in this way, the construction height reaches 7.2 meters. Construction workers need to carry tools to climb to a higher position, which is difficult to move and poses a safety hazard; 2) 2 to 3 layers of scaffolding are required during construction. When the outer plate is loosely pasted, if the gap between the outer plates needs to be adjusted, the high-level scaffolding needs to be removed; 3) The internal outfitting parts are constructed in sections in a horizontal state, so the accuracy control is relatively difficult and the construction period is quite long; 4) The fillet welds between the loose outer plate and the rib plate are overhead welds, which are difficult to construct. Summary of the invention

[0003] In view of the shortcomings of the prior art described above, the present invention provides a method for constructing the hopper tank sections of a liquefied gas carrier. First, the hopper tank sections are divided into three parts, namely, the inclined plate middle group, the bottom plate middle group and the bilge curved middle group, based on the position where the bilge line changes; then, the three middle groups are made respectively, and the relevant outfitting parts inside are embedded; finally, the three middle groups are closed normally, the butt joints are welded, the bulk parts are installed and the internal outfitting parts are installed in place. The present invention can reduce the construction height, reduce the workload of scaffolding erection, and effectively avoid repeated scaffolding erection, effectively saving labor costs; in addition, the installation accuracy is significantly improved, reducing rework caused by poor assembly accuracy; the method for dividing the hopper tank sections is optimized, thereby reducing the construction difficulty; finally, the three middle groups are constructed simultaneously, and the components assembled and welded in the large group stage in the traditional construction method are moved forward to the middle group stage, which greatly shortens the construction time of the large group.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a method for constructing a hopper tank segment of a liquefied gas carrier, comprising the following steps:

[0005] Taking the position where the bilge line changes as the boundary, the hopper tank is divided into the inclined plate middle group, the bottom plate middle group and the bilge curved middle group;

[0006] The inclined plate middle group, the bottom plate middle group and the bilge curved middle group are manufactured respectively;

[0007] The inclined plate middle group, the bottom plate middle group and the bilge curved middle group are closed normally, the butt joints are welded, and the bulk parts and internal outfitting parts are installed.

[0008] Optionally, when dividing the bottom side tank into sections, the break seam between the bilge curved middle group and the inclined plate middle group is arranged at a wireless position on the side, and the break seam position between the bilge curved middle group and the bottom middle group is flush with the outer plate seam.

[0009] Optionally, manufacturing the inclined plate assembly includes:

[0010] The longitudinal bones are installed with the inner shell as the base surface to form the inner shell middle group;

[0011] Install the sloping plate middle group ribs and the third side longitudinal girder, and after they are in place, install the side outer plate middle group and weld them;

[0012] The outfitting parts are embedded in the inclined plate.

[0013] Optionally, after the inner shell middle group is manufactured, the inner shell middle group is used as the base surface of the inclined plate middle group, and is moved to a flat tire frame for subsequent manufacturing.

[0014] Optionally, after the embedded outfitting parts are assembled in the inclined plate, the method further includes: measuring the accuracy of the structural nodes at the inner shell plate and the third side longitudinal girder.

[0015] Optionally, manufacturing the bottom plate assembly includes:

[0016] The longitudinal bones are installed with the bottom plate as the base surface to form a straight inner bottom middle group;

[0017] Install inner bottom longitudinal girders and straight inner bottom middle ribs;

[0018] The outfitting parts are embedded in the base plate.

[0019] Optionally, making the bilge curve group includes:

[0020] The curved outer plate of the bilge is used as the base for the tire, and the tire frame template is used to control the linear accuracy;

[0021] Install longitudinals and bilge curved center floor plates;

[0022] The outfitting parts are embedded in the bilge curve.

[0023] Optionally, during the normal closing process, the bottom plate middle group, the bilge curved middle group and the inclined plate middle group are positioned in sequence.

[0024] Optionally, during the normal closing process, hoisting is performed by using hoists in cooperation with the bottom plate middle group, the bilge curved middle group and the inclined plate middle group.

[0025] Optionally, when installing internal outfitting parts, the verticality of the outfitting parts is first measured and then positioned and installed.

[0026] The method for constructing the hopper tank sections of a liquefied gas carrier provided by the present invention has at least the following beneficial effects:

[0027] 1) The method of dividing the hopper tank sections was optimized, and the original construction height was reduced from 7.2 meters to 3.7 meters, which reduced the workload of scaffolding erection by about 50% in the assembly stage, reduced the construction height, and effectively avoided repeated scaffolding erection, effectively saving costs;

[0028] 2) Provide a method of block-by-block normal construction to facilitate the positioning of internal outfitting parts, greatly improve the installation accuracy of outfitting parts in the large assembly stage, and reduce rework caused by poor assembly accuracy;

[0029] 3) Compared with the existing technology, the welds between the outer plate and the rib plate that need to be welded in the large group are optimized to be welded flat in the middle group stage, which reduces the construction difficulty;

[0030] 4) The three-part intermediate assembly can be built in parallel, and the components assembled and welded in the large assembly stage in the traditional construction method can be moved forward to the intermediate assembly stage, effectively shortening the construction time of the large assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram showing the construction of the hopper tank section in the prior art.

[0032] Figure 2 A schematic diagram showing the division of the hopper tank sections provided in an embodiment is shown.

[0033] Figure 3 Shown is a schematic structural diagram of the inclined plate center assembly and its outfitting parts provided in an embodiment.

[0034] Figure 4 Shown is a schematic structural diagram of the bottom plate mid-group and its outfitting parts provided in an embodiment.

[0035] Figure 5 Shown is a schematic structural diagram of the bilge curved center assembly and its outfitting parts provided in an embodiment.

[0036] Figure 6 Shown is a schematic diagram of the arrangement of the lifting horses in the base plate group provided in an embodiment.

[0037] Figure 7 Shown is a schematic diagram of the arrangement of the hoisting horses in the bilge curved middle group provided in an embodiment.

[0038] Figure 8 Shown is a schematic diagram of the arrangement of the lifting horses in the inclined plate group provided in the embodiment.

[0039] Fig. 9Shown is a schematic structural diagram of a hopper tank section provided in an embodiment.

[0040] Component number description

[0041] 1 Incline Middle Group

[0042] 10 Inner hull

[0043] 11 Inner hull middle group

[0044] 12 Ribs in the middle of the inclined plate

[0045] 13 Third side longitudinal girder

[0046] 14 Side plating center group

[0047] 2 Bottom plate middle group

[0048] 20 Base Plate

[0049] 21 Straight insole midsole

[0050] 22 Inner bottom longitudinal girder

[0051] 23 Straight inner bottom middle rib

[0052] 3. Bilge type middle group

[0053] 31 Bilge curved outer plating

[0054] 32 Bilge curved middle rib

[0055] 40 Outfittings

[0056] 50 longitudinal bones

[0057] 61 A-type hanging horse

[0058] 62 B-type hanging horse

[0059] 63 Lifting Horse Reinforcement Plate

[0060] 64 D-type hanging horse DETAILED DESCRIPTION

[0061] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0062] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Although the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation, the form, quantity, positional relationship and proportion of each component in actual implementation can be changed at will under the premise of realizing the technical solution of this party, and the component layout form may also be more complicated.

[0063] Example

[0064] This embodiment provides a method for constructing a hopper tank segment of a liquefied gas carrier, comprising the following steps:

[0065] S1: Taking the position where the bilge line changes as the boundary, the hopper tank is divided into the inclined plate middle group, the bottom plate middle group and the bilge curved middle group;

[0066] like Figure 2 As shown, the hopper tank is divided into the inclined plate middle group 1, the bottom plate middle group 2 and the bilge curved middle group 3 with the bilge line change position as the boundary. As an example, the shell plate and T row of the inclined plate middle group 1 can also be used as the inner shell plate middle group to facilitate construction on the flat assembly line; the break between the bilge curved middle group 3 and the inclined plate middle group 1 is arranged at the side without line position, so as to ensure that the outer plate of the inclined plate middle group 1 is a straight plate, so as to facilitate construction on the flat straight waterline; the break position between the bilge curved middle group 3 and the bottom middle group 2 is flush with the outer plate seam, so as to facilitate the subsequent segment closing. By optimizing the division method of the hopper tank section, the original construction height was reduced from 7.2 meters to 3.7 meters, reducing the workload of scaffolding erection by about 50% in the large assembly stage, reducing the construction height, and effectively avoiding the repeated erection of scaffolding.

[0067] S2: respectively manufacturing the inclined plate middle group, the bottom plate middle group and the bilge curved middle group;

[0068] like Figure 3 As shown, first, the longitudinal bones 50 are installed with the inner shell 10 as the base surface to form the inner shell middle group 11, and the inner shell middle group 11 is used as the base surface of the inclined plate middle group 1, which is moved to the flat frame for subsequent production, so as to ensure the flatness of the inner shell; then, the inclined plate middle group ribs 12 and the third side longitudinal girder 13 are installed, and after they are assembled in place, the side outer plate middle group 14 is installed and welded; then, the outfitting parts 40 installed in the middle group stage are embedded in the inclined plate middle group 1, and at this time, the outfitting parts 40 are embedded in a spot welding positioning state, so as to complete the manufacture of the inclined plate middle group 1; finally, the structural (Construction Monitoring, CM) node accuracy measurement is carried out on the inner shell 10 and the third side longitudinal girder 13, and the construction can be continued only after passing the measurement.

[0069] like Figure 4As shown, first, the longitudinal bones 50 are installed with the bottom plate 20 as the base surface to form a straight inner bottom middle group 21, and the straight inner bottom middle group 21 is used as the base surface of the bottom plate middle group 2 for subsequent assembly; then, the inner bottom longitudinal girders 22 and the straight inner bottom middle group ribs 23 are installed; finally, the outfitting parts 40 installed in the middle group stage are embedded in the bottom plate middle group 2. At this time, the outfitting parts 40 are embedded in a spot welding positioning state, thereby completing the manufacture of the bottom plate middle group 2.

[0070] like Figure 5 As shown, first, the bilge curved outer plate 31 is used as the base surface tire, and the tire frame template is used to control the linear accuracy; then, the longitudinal bones 50 and the bilge curved middle group ribs 32 are installed; finally, the outfitting parts 40 installed in the middle group stage are embedded in the bilge curved middle group 3. At this time, the outfitting parts 40 are embedded in the spot welding positioning state, thereby completing the manufacture of the bilge curved middle group 3.

[0071] In this embodiment, the inclined plate middle group 1, the bottom plate middle group 2 and the bilge curved middle group 3 can be constructed in parallel, and the components assembled and welded in the large assembly stage in the traditional construction method are moved forward to the middle assembly stage, effectively shortening the large assembly construction time; the pre-embedded outfitting parts are convenient for the positioning of subsequent outfitting parts, so that the installation accuracy of the outfitting parts in the large assembly stage is greatly improved, and the rework caused by poor assembly accuracy is reduced; compared with the existing technology, the welds of the outer plate and the ribs that need to be welded overhead in the large assembly are optimized to flat welding in the middle assembly stage, reducing the construction difficulty.

[0072] S3: Close the inclined plate middle group, the bottom plate middle group and the bilge curved middle group normally, weld the butt joints, and install bulk parts and internal outfitting parts.

[0073] First, in the large assembly stage, the bottom plate middle group 2 is used as the base surface, and the bilge curved middle group 3 is hoisted first, and after the precision positioning is completed, the inclined plate middle group 1 is hoisted to complete the closing. As an example, the closing process is completed with the help of the lifting horse. Specifically, the arrangement of the lifting horse of the bottom plate middle group 2 is as follows Figure 6 As shown, the bottom plate middle group 2 is arranged with A-type hanging horse 61, B-type hanging horse 62 and hanging horse reinforcement plate 63; the hanging horse arrangement form of the bilge curved middle group 3 is referred to Figure 7 As shown, the bilge curved middle group 3 is arranged with a B-type hanging horse 62, a D-type hanging horse 64 and a hanging horse reinforcement plate 63; the hanging horse arrangement form of the inclined plate middle group 1 is referred to Figure 8 As shown, the inclined plate middle group 1 is arranged with an A-type lifting horse 61, a D-type lifting horse 64 and a lifting horse reinforcement plate 63. When lifting the inclined plate middle group 1, the inclined plate middle group 1 is first turned over with the help of the D-type lifting horse 64, and then the D-type lifting horse 64 and the A-type lifting horse 61 are used for translation lifting until the closure is completed.

[0074] Next, the accuracy of the inclined plate middle group 1 is measured. As an example, there are construction monitoring (CM) node accuracy requirements at the fillet welds between the inclined plate middle group 1 and the bottom plate middle group 2.

[0075] Finally, weld the outer plate butt joints, weld the fillet welds of the inclined plate middle group 1 and the bottom plate middle group 2, weld the rib plate butt joints, and install the large group of bulk parts; in addition, first measure the verticality of the internal outfitting parts 40 accurately, and then position and install them; the completed hopper tank sections are as follows Fig. 9 As shown, the redundant hanging horses are removed after completion.

[0076] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for constructing a liquefied gas carrier hopper tank segment, characterized in that: The steps include: Taking the position where the bilge line changes as the boundary, the hopper tank is divided into the inclined plate middle group, the bottom plate middle group and the bilge curved middle group; The inclined plate middle group, the bottom plate middle group and the bilge curved middle group are manufactured respectively; The inclined plate middle group, the bottom plate middle group and the bilge curved middle group are closed normally, the butt joints are welded, and the bulk parts and internal outfitting parts are installed.

2. The method for constructing the hopper tank sections of a liquefied gas carrier according to claim 1, characterized in that: When dividing the hopper tank into sections, the break seam between the bilge curved middle group and the inclined plate middle group is arranged at a wireless position on the side, and the break seam position between the bilge curved middle group and the bottom middle group is flush with the outer plate seam.

3. The method for constructing the hopper tank sections of a liquefied gas carrier according to claim 1, characterized in that: The process of making the inclined plate assembly comprises: The longitudinal bones are installed with the inner shell as the base surface to form the inner shell middle group; Install the sloping plate middle group ribs and the third side longitudinal girder, and after they are in place, install the side outer plate middle group and weld them; The outfitting parts are embedded in the inclined plate.

4. The method for constructing the hopper tank sections of a liquefied gas carrier according to claim 3, characterized in that: After the inner shell middle group is manufactured, the inner shell middle group is used as the base surface of the inclined plate middle group and is moved to a flat tire frame for subsequent manufacturing.

5. The method for constructing the hopper tank sections of a liquefied gas carrier according to claim 3, characterized in that: After the embedded outfitting parts are assembled in the inclined plate, the method further includes: measuring the accuracy of the structural nodes at the inner shell plate and the third side longitudinal girder.

6. The method for constructing the hopper tank sections of a liquefied gas carrier according to claim 1, characterized in that: The method of making the base plate comprises: The longitudinal bones are installed with the bottom plate as the base surface to form a straight inner bottom middle group; Install inner bottom longitudinal girders and straight inner bottom middle ribs; The outfitting parts are embedded in the base plate.

7. The method for constructing a liquefied gas carrier hopper tank segment according to claim 1, characterized in that: The method of making the bilge curved middle group includes: The curved outer plate of the bilge is used as the base for the tire, and the tire frame template is used to control the linear accuracy; Install longitudinals and bilge curved center floor plates; The outfitting parts are embedded in the bilge curve.

8. The method for constructing hopper tank sections of a liquefied gas carrier according to claim 1, characterized in that: During the normal closing process, the bottom plate middle group, the bilge curved middle group and the inclined plate middle group are positioned in sequence.

9. The method for constructing hopper tank sections of a liquefied gas carrier according to claim 1, characterized in that: During the normal closing process, the bottom plate middle group, the bilge curved middle group and the inclined plate middle group are hoisted by using hoists.

10. The method for constructing hopper tank sections of a liquefied gas carrier according to claim 1, characterized in that: When installing internal outfitting parts, first measure the verticality of the outfitting parts and then position and install them.

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