Transportation method for liquefied natural gas (LNG) ship group vertical rib plates

Abstract

The invention relates to the field of shipbuilding, in particular to a transportation method for small-group vertical rib plates of an LNG (liquefied natural gas) ship, which comprises an insertion frame, a plurality of limiting grooves are formed in the insertion frame, the limiting grooves are configured to be structures allowing the small-group vertical rib plates to be vertically inserted, and the limiting grooves are distributed at intervals and are parallel to one another. According to the large assemblage production requirement, after the multiple small assemblage rib plates are vertically inserted into the insertion frame and transported to a large assemblage area, the needed rib plates are directly hoisted out of the limiting grooves, large assemblage production work can be conducted, compared with the mode that the multiple small assemblage rib plates are stacked and transported, the time for material overturning and plate spreading in the middle is shortened, the production efficiency is improved, and the production cost is reduced. And high turnover of lightering tools is also facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of shipbuilding, and in particular to a method for transporting small vertical ribs of an LNG ship. Background Art

[0002] The bottom section of the LNG ship is mainly composed of small groups of ribs. From the perspective of reducing the workload of large-scale manual welding, the bottom ribs are usually made into a whole rib in the small group assembly stage, and reinforcing ribs are installed on the surface of the ribs.

[0003] The conventional method of transporting such small groups of ribs is that after the ribs are completed, multiple ribs are hoisted and stacked on the "bed", and then the "bed" is transferred to the segment production area by a large flatbed truck. In the segment production area, the ribs are unloaded piece by piece by a gantry crane to the stacking area and spread out. When assembling in large groups, the corresponding ribs are selected according to needs and hoisted onto the segments to complete the assembly work.

[0004] The problems existing in the related technology are: first, after the small group of vertical ribs are produced, they are generally stacked up and down, which can easily cause the reinforcing ribs on the surface of the ribs to bend, increasing rework in the subsequent processes; second, the size of the small group of vertical ribs at the bottom is large, and the turnover pressure of the batch production gantry is large, which affects the discharge of the ribs after the production is completed; third, the stacking of ribs during transportation can easily cause the ribs to slip, posing a safety risk; fourth, the subsequent processes need to spread the stacked ribs on site, and then hoist them one by one to the sections for assembly as needed, which increases the workload of material sorting and occupies production space. Summary of the invention

[0005] In order to improve the transportation efficiency of small groups of vertical ribs and reduce the possibility of accidents occurring during the transportation of the ribs, the present application provides a method for transporting small groups of vertical ribs of an LNG ship.

[0006] The present application provides a method for transporting LNG ship sub-group vertical ribs using the following technical solutions:

[0007] A method for transporting small group vertical ribs of an LNG ship, the method adopts a special transport tool, the transport tool comprises a rack, a plurality of limit grooves are formed on the rack, the limit grooves are configured as a structure for vertical insertion of small group vertical ribs, and the limit grooves are spaced and parallel to each other.

[0008] Optionally, the rack includes a base and a plurality of columns disposed on the base, the plurality of columns are evenly arranged on the base, and a plurality of limiting grooves are formed between the plurality of columns and the base.

[0009] Optionally, a triangular rib plate is provided at the lower end of the column, one side of the triangular rib plate is fixedly connected to the column, and the other side of the triangular rib plate is fixedly connected to the base.

[0010] Optionally, a plurality of hanging plates are evenly distributed on the outer side of the base, and each of the hanging plates is provided with a through hanging hole.

[0011] Optionally, the base includes two longitudinal beams and several transverse beams, the two longitudinal beams are spaced apart, several transverse beams are arranged between the two longitudinal beams, and the plurality of columns are distributed on some of the transverse beams.

[0012] Optionally, the column is made of a seamless steel pipe with a diameter of 130 mm, and the top of the column is configured to be sealed to prevent internal water accumulation and rust.

[0013] Optionally, the number of the hanging plates is four, and the four hanging plates are evenly distributed at the four corners of the base.

[0014] Optionally, the small group of vertical ribs includes a main body and at least two reinforcing ribs arranged on the same side of the main body, the main body is vertically inserted into the limiting groove, and the opposite or reverse sides of the two reinforcing ribs are respectively abutted against the columns.

[0015] Optionally, the method comprises the following steps:

[0016] S1: The inserting rack is placed in the discharge area of ​​the small group vertical ribs. After a plurality of small group vertical ribs are completed, the lifting device is connected to the lifting point at the bottom of the small group vertical ribs to transfer them to the top of the inserting rack. At this time, the ribs are turned from upright to inverted, and then the ribs are inserted into the limiting grooves from top to bottom by the lifting device;

[0017] S2: After the small group of vertical ribs are hoisted into the limit grooves, the gantry crane is connected to the rack to transfer the rack as a whole to the flatbed truck;

[0018] S3: The flatbed truck transports the rack to the large assembly production site;

[0019] S4: Finally, the small group of vertical ribs in the limiting groove are hoisted one by one onto the large assembly section for assembly as needed.

[0020] Optionally, in step S1, the insertion directions of two adjacent small group vertical ribs are 180°.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. Taking advantage of the structural characteristics of the small group of vertical ribs, the columns set on the base can limit the ribs from sliding over a large range after they are inserted into the limiting grooves, thereby improving the stability of the transportation process;

[0023] 2. Use multiple columns to separate each rib plate, so that two adjacent rib plates maintain a certain distance, reducing the possibility of damage to the small group of rib plates during transportation;

[0024] 3. According to the needs of large-scale assembly production, multiple small-group vertical ribs are inserted into the rack in a vertical position and transported to the large-scale assembly area. The required ribs are directly lifted out of the limit slots to carry out large-scale assembly production. Compared with stacking and transporting multiple small-group vertical ribs, this reduces the time for turning over and spreading the materials in the middle, improves production efficiency, and is also conducive to the high turnover of the transport tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram of an embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the plug-in rack according to an embodiment of the present application.

[0027] Figure 3 It is a transportation flow chart of the small group vertical ribs in the embodiment of the present application.

[0028] Figure numerals: 1, rack; 11, base; 111, longitudinal beam; 112, cross beam; 12, column; 13, triangular rib plate; 14, hanging plate; 15, hanging hole; 2, limiting groove. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0030] The present application embodiment discloses a method for transporting vertical ribs of a small group of LNG ships. Figure 1 The transportation method uses a special transportation tool, which includes a rack 1, on which a plurality of limit grooves 2 are formed, each of which corresponds to a manufactured small group of vertical ribs, wherein the limit grooves 2 are specifically configured as a structure for the small group of vertical ribs to be inserted from top to bottom. The rack 1 provides support and limit for the small group of vertical ribs, thereby facilitating the transportation of the small group of vertical ribs and subsequent unloading operations.

[0031] Reference Figure 1 The rack 1 includes a base 11 and a plurality of columns 12 disposed on the base 11. The limiting groove 2 is formed between the base 11 and the plurality of columns 12. When the small group of vertical ribs is inserted into the limiting groove 2, the base 11 provides bottom support for the small group of vertical ribs, and the columns 12 provide side support for the small group of vertical ribs and play a limiting role. The base 11 is further composed of a plurality of cross beams 112 and longitudinal beams 111 disposed at both ends of the plurality of cross beams 112. The length direction of the limiting groove 2 is parallel to the extension direction of the longitudinal beams 111. The plurality of cross beams 112 are parallel to each other and are connected to two longitudinal beams 111 at both ends to form a whole.

[0032] Preferably, the number of cross beams 112 is seven, of which two cross beams 112 are fixed at both ends of the longitudinal beam 111, and the remaining five cross beams 112 are fixed in the middle, and the spacing between two adjacent cross beams 112 is 1075mm, 1200mm, 900mm, 900mm, 1200mm and 1075mm respectively (the spacing is based on the mainstream 174,000m 3 The LNG carrier cargo hold bottom section has a small group of vertical ribs structure characteristics. This setting method can make the small group of vertical ribs and the base 11 have sufficient contact area under the minimum size of the tooling, thereby improving the stability of the small group of vertical ribs during transportation). The rectangular frame structure is composed of two longitudinal beams 111 and seven cross beams 112. The longitudinal beams 111 and the cross beams 112 are made of 30# I-beams. The appearance size of the base 11 is 6570mm*4220mm.

[0033] Furthermore, multiple columns 12 are distributed on the first, third, fifth and seventh beams 112. Specifically, a column 12 is set on the first beam 112 at intervals of 550mm, 1150mm, 600mm, 1150mm and 550mm respectively; a column 12 is set on the third beam 112 at intervals of 725mm, 600mm, 375mm, 725mm, 600mm, 425mm and 550mm respectively; a column 12 is set on the fifth beam 112 at intervals of 725mm, 600mm, 375mm, 725mm, 600mm, 425mm and 550mm respectively; and a column 12 is set on the seventh beam 112 at intervals of 725mm, 600mm, 1100mm, 600mm and 975mm respectively. This arrangement is only one of the preferred implementations of the technical solution. For those skilled in the art, the number and position of the columns 12 can be adjusted according to actual production needs, and this arrangement cannot be regarded as a limitation on the present application. The column 12 is made of a seamless steel pipe with a diameter of 130 mm. The height of the column 12 is set according to the performance height of the lifting in the small group workshop, and is not specifically limited here. The top of the column 12 is sealed with a round cake to prevent water accumulation and rust inside the column 12. In addition, a triangular rib plate 13 is installed at the connecting end of the column 12 and the base 11 as needed to improve the connection stability between the column 12 and the base 11.

[0034] Generally speaking, the small group of vertical ribs are all sheet structures, and have a first end with a larger thickness and a second end with a smaller thickness. In order to save the space occupied when multiple small group of vertical ribs are inserted into the limiting groove 2 and make the arrangement more compact, the insertion direction of the two adjacent ribs can be controlled to be 180° during insertion, that is, the first end of one rib and the second end of the other adjacent rib are located on the same side, thereby reducing the space occupied and making the rack 1 more compact as a whole.

[0035] Furthermore, at least two reinforcing ribs are provided on the small group of vertical ribs. When the small group of vertical ribs are inserted into the limiting groove 2, the reinforcing ribs are perpendicular to the vertical surface of the small group of vertical ribs. By arranging the columns 12 at specific positions, at least two reinforcing ribs are respectively located on the inner side or outer side of two of the columns 12, so that the small group of vertical ribs can be further fixed, reducing the amplitude of the shaking of the small group of vertical ribs along the length direction of the limiting groove 2, and further improving the stability of the small group of vertical ribs during transportation.

[0036] Reference Figure 1 and Figure 2 Four hanging plates 14 are arranged on the base 11, and the four hanging plates 14 are evenly distributed at the four corners of the base 11, and a through hanging hole 15 is opened on each hanging plate 14. The setting of the hanging plates 14 is used to facilitate the connection between the crane and the rack 1 after the small group of vertical ribs are inserted into the limiting grooves 2 one by one, and then the rack 1 and the small group of vertical ribs are transported to the large assembly area.

[0037] The embodiment of the present application also provides a method for transporting the vertical ribs of a LNG ship group, using the above-mentioned transport tooling for the vertical ribs of a LNG ship group, comprising the following steps:

[0038] S1: Place the inserting rack 1 in the discharging area of ​​the small group vertical ribs. After multiple small group vertical ribs are completed, the lifting device is connected to the lifting point at the bottom of the small group vertical ribs to transfer them to the top of the inserting rack. At this time, the ribs are turned from upright to inverted, and then the ribs are inserted into the limiting grooves 2 from top to bottom through the lifting device;

[0039] S2: After the small group of vertical ribs are hoisted into the limiting groove 2, the gantry crane is connected to the inserting frame 1, and the inserting frame 1 is transferred as a whole to the flatbed truck;

[0040] S3: The flatbed truck transports the rack 1 to the large assembly production site;

[0041] S4: Finally, the small group of vertical ribs in the limiting groove 2 are hoisted one by one onto the large assembly segment for assembly as needed.

[0042] In step S1, the insertion directions of two adjacent small group vertical ribs are 180 degrees.

[0043] It can be understood by those skilled in the art that the current LNG ship bottom sections are built in reverse, and in step S1, the lifting points are set at the bottom of the ribs so that when the lifting tool inserts the ribs into the racks, the ribs are in an inverted state, and the inverted small group of ribs can be directly lifted and used after being transported to the large assembly area, thereby reducing one turning action.

[0044] In specific implementation, according to the large assembly production requirements, the number of small assembly ribs transported at one time by the insert rack 1 is preferably 4-5 pieces, and correspondingly, the number of the limiting grooves 2 formed on the insert rack 1 is preferably 4-5.

[0045] It should be clear that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A method for transporting vertical ribs of LNG ship groups, characterized in that: The method adopts a special transport tool, which includes a plug-in frame with a plurality of limit grooves formed on the plug-in frame. The limit grooves are configured as a structure for vertical insertion of a small group of vertical ribs, and the limit grooves are spaced and parallel to each other.

2. The method for transporting vertical ribs of a LNG ship group according to claim 1, characterized in that: The inserting rack comprises a base and a plurality of columns arranged on the base, the plurality of columns are evenly arranged on the base, and a plurality of limiting grooves are formed between the plurality of columns and the base.

3. The method for transporting vertical ribs of a LNG ship group according to claim 2, characterized in that: A triangular rib plate is arranged at the lower end of the column, one side of the triangular rib plate is fixedly connected to the column, and the other side of the triangular rib plate is fixedly connected to the base.

4. The method for transporting vertical ribs of a LNG ship group according to claim 2, characterized in that: A plurality of hanging plates are evenly distributed on the outer side of the base, and each of the hanging plates is provided with a through hanging hole.

5. The method for transporting vertical ribs of a LNG ship group according to claim 2, characterized in that: The base comprises two longitudinal beams and several transverse beams, the two longitudinal beams are distributed at intervals, several transverse beams are arranged between the two longitudinal beams, and a plurality of columns are distributed on some of the transverse beams.

6. The method for transporting vertical ribs of a LNG ship group according to claim 2, characterized in that: The column is made of seamless steel pipe with a diameter of 130 mm, and the top of the column is set to be sealed to prevent water accumulation and rust inside.

7. The method for transporting vertical ribs of a LNG ship group according to claim 4, characterized in that: The number of the hanging plates is four, and the four hanging plates are evenly distributed at the four corners of the base.

8. A method for transporting vertical ribs of LNG ship panels according to any one of claims 1 to 7, characterized in that: The small group of vertical ribs includes a main body and at least two reinforcing ribs arranged on the same side of the main body. The main body is vertically inserted into the limiting groove, and the opposite or opposite sides of the two reinforcing ribs are respectively in contact with the columns.

9. The method for transporting vertical ribs of LNG ship groups according to claim 8, characterized in that: The method comprises the following steps: S1: The inserting rack is placed in the discharge area of ​​the small group vertical ribs. After a plurality of small group vertical ribs are completed, the lifting device is connected to the lifting point at the bottom of the small group vertical ribs to transfer them to the top of the inserting rack. At this time, the ribs are turned from upright to inverted, and then the ribs are inserted into the limiting grooves from top to bottom by the lifting device; S2: After the small group of vertical ribs are hoisted into the limit grooves, the gantry crane is connected to the rack to transfer the rack as a whole to the flatbed truck; S3: The flatbed truck transports the rack to the large assembly production site; S4: Finally, the small group of vertical ribs in the limiting groove are hoisted one by one onto the large assembly section for assembly as needed.

10. The method for transporting vertical ribs of a LNG ship group according to claim 9, characterized in that: In step S1, the insertion directions of two adjacent small group vertical ribs are 180 degrees.

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