CN116039872A - Method for controlling overall assembly carrying precision of building block on upper layer of LNG ship and LNG ship - Google Patents
Method for controlling overall assembly carrying precision of building block on upper layer of LNG ship and LNG ship Download PDFInfo
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- CN116039872A CN116039872A CN202211510853.0A CN202211510853A CN116039872A CN 116039872 A CN116039872 A CN 116039872A CN 202211510853 A CN202211510853 A CN 202211510853A CN 116039872 A CN116039872 A CN 116039872A
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- building block
- upper building
- line
- main deck
- lng ship
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
- B63B73/20—Building or assembling prefabricated vessel modules or parts other than hull blocks, e.g. engine rooms, rudders, propellers, superstructures, berths, holds or tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
- B63B73/30—Moving or transporting modules or hull blocks to assembly sites, e.g. by rolling, lifting or floating
Abstract
The invention relates to a method for controlling the carrying precision of a total building block on an LNG ship and the LNG ship, which comprises the following steps: the upper building block is built on the jig frame according to layering total assembly from bottom to top; after the positioning of each part of the upper building block is finished, measuring and correcting the flatness of each deck and the surrounding wall, and reinforcing the channel steel of the lower opening surrounding wall of the upper building block; after the upper building block is subjected to total assembly welding, a height datum line with uniform height is marked on the periphery of the surrounding wall of the upper building block part at the bottommost layer, and the center lines are respectively marked on the head and tail sides of the upper building block; a first guiding device is arranged outside the upper building block, and a second guiding device corresponding to the first guiding device is arranged on the main deck mounting butt joint surface. The accuracy is controlled by the method, so that the possibility of deformation of the thin plate is reduced; the first guiding device and the second guiding device are matched for guiding, so that the problem of high underwater carrying difficulty is solved, and carrying efficiency is improved.
Description
Technical Field
The invention relates to the field of ship construction, in particular to a method for controlling the overall assembly carrying precision of a building block on an upper layer of an LNG ship and the LNG ship.
Background
The LNG ship superstructure segmented structure is complex, and consists of a deck, a surrounding wall plate, a strengthening material, a side surrounding sill, an upper surrounding sill and the like, wherein the number of inner cabins is large, the plates are thin, and deformation is easy to occur in the carrying process of the assembly; in addition, when the LNG ship upper building section is carried in the section carrying stage, the LNG ship upper building section is generally carried by adopting a floating crane, the folding posture of the section is difficult to adjust when the LNG ship upper building section is hoisted in water, and the hoisting time is long.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for controlling the overall assembly carrying precision of the upper building block of an LNG ship and the LNG ship, which realize good overall assembly carrying precision of the upper building block of the LNG ship, reduce structural deformation in the construction process and realize rapid carrying at a wharf stage.
The technical purpose of the invention is realized by the following technical scheme:
a method for controlling the overall assembly carrying precision of an upper building block of an LNG ship, wherein the upper building block is carried on a cabin main deck, comprises the following steps:
building the upper building block on the jig frame according to a layered assembly from bottom to top, and hoisting the upper building block part of the lower layer after the positioning of the upper building block part of the bottommost layer is finished;
after the positioning of each part of the upper building block is finished, measuring and correcting the flatness of each deck and the surrounding wall, and reinforcing the channel steel of the lower opening surrounding wall of the upper building block;
after the upper building block is subjected to total assembly welding, a height datum line with uniform height is marked on the periphery of the surrounding wall of the upper building block part at the bottommost layer, and the center lines are respectively marked on the head and tail sides of the upper building block;
the first guiding device is arranged outside the superstructure block, the second guiding device corresponding to the first guiding device is arranged on the main deck mounting and abutting surface, and the superstructure block is mounted on the main deck mounting and abutting surface by means of the mutual matching of the first guiding device and the second guiding device.
Further, the first guide device comprises an annular structure, the second guide device comprises a guide column, the upper end of the guide column is conical, and the lower end of the guide column is arranged on the main deck carrying butt joint surface; the annular structure is sleeved on the guide post along the conical end part of the guide post during positioning.
Further, the first guiding devices are distributed in a triangular shape relative to the superstructure total building block.
Further, before the hierarchical total assembly of the upper building block is constructed, the method comprises the following steps:
Further, the ground sample line comprises a central line and a rib detection line, the central line and the rib detection line are mutually perpendicular, and the position of the ground pier support is determined according to the central line and the rib detection line; the angle degree of the central line and the rib detecting line is controlled within 2 mm.
Further, the ground pier supporting height is adjustable, the levelness of the ground pier supporting is adjusted, and the ground pier supporting is adjusted to the designed height.
Further, a hull center line, a rib inspection line and a height datum line are marked on the main deck carrying butt joint surface; after the superstructure block is mounted on the main deck mounting butt joint surface, according to the alignment of the center line on the head-tail surface of the superstructure block and the center line of the hull on the main deck mounting butt joint surface, the rib inspection line of the superstructure block is adjusted to be aligned with the rib inspection line of the main deck mounting butt joint surface, and the distance between the height datum line of the superstructure block and the height datum line on the main deck mounting butt joint surface is adjusted to control the height of the superstructure block.
Further, when the upper building block is built according to the layered assembly from bottom to top, layering is carried out along the position 100mm above the deck surface by taking the deck surface as a reference.
The invention also provides an LNG ship, which comprises the superstructure block, wherein the superstructure block of the LNG ship is mounted on the main deck mounting butt joint surface according to the method for controlling the mounting precision of the superstructure block assembly of the LNG ship.
Compared with the prior art, the method has the beneficial effects that the accuracy is controlled by the method for controlling the overall-assembly carrying accuracy of the upper building block on the LNG ship, so that the possibility of sheet deformation is reduced; in addition, by the cooperation of the first guide device and the second guide device. The main deck is guided when the superstructure block is mounted on the main deck mounting butt joint surface, so that the problem of high mounting difficulty caused by difficulty in posture adjustment during underwater mounting is solved, and the mounting efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of the general section structure of the superstructure in the present invention.
FIG. 2 is a schematic diagram of a geodesic and pier support arrangement in accordance with the present invention.
Fig. 3 is a top view of a first superstructure block section of the present invention.
Fig. 4 is a top view of a second superstructure block section according to the present invention.
FIG. 5 is a top view of the deck and enclosure wall flatness measurement of the present invention.
Fig. 6 is a schematic view of the channel steel installed on the lower opening surrounding wall of the upper building block in the invention.
Fig. 7 is a schematic drawing showing the center line and the height reference line of the superstructure block in the present invention.
Fig. 8 is a schematic view showing a combination of the first guide and the second guide in the present invention.
In the figure, 1, center line; 2. rib inspection lines; 3. the position of the total ground pier; 4. segment one; 5. segmentation II; 6. a center line; 7. rib inspection lines; 8. the whole width of the lower opening; 9. layer height; 10. a level bar; 11. channel steel; 12. a center line; 13. a height datum line; 14. a first guide device; 15. a second guide device; 16. and (5) corners.
Detailed Description
The technical scheme of the invention is further described below with reference to the specific embodiments:
a method for controlling the overall assembly carrying precision of an upper building block of an LNG ship, wherein the upper building block is carried on a cabin main deck, comprises the following steps:
1. total group ground sample line scribing and ground pier supporting arrangement
According to the tire position arrangement diagram, a ground pattern line is arranged on a total assembly site of a building block at an upper layer and a total assembly ground pier supporting arrangement position is marked, as shown in fig. 2, 1 is a central line, 2 is a rib detection line, 3 is a total assembly ground pier position, and the central line 1 and the rib detection line 2 are mutually perpendicular; preferably, the angle degree of the central line 1 and the rib detection line 2 is controlled within 2 mm; and placing a supporting ground pier on the total assembly ground pier position 3, wherein the height of the supporting ground pier is adjustable, measuring the level of the supporting ground pier by using a total station, carrying out levelness adjustment on the supporting ground pier, and then adjusting the height of the supporting ground pier to the design height. The ground pier support comprises an upper section and a lower section, the two sections are connected in a threaded connection mode, and the length of the threaded connection is changed in a rotating mode to achieve height adjustment.
2. Main dimension positioning parameter control of general group
The last building block is shown in fig. 1, the upper building block starts from the lowest second floor part, the upper and lower upper building block parts are divided by taking the deck surface as a reference, the division is layered by taking the 100mm position of the surrounding wall above the deck as a division position, the total block mode is a butt joint total block of the widths of the left and right segments, as shown in fig. 3, the first segment 4 and the second segment 5 are butt joint on the jig frame, the first segment 4 is provided with a central line 6, the first segment 4 is hoisted, and the second segment 5 is hoisted.
When the first section 4 is lifted and positioned, the width direction of the first section 4 is positioned, so that the central line 6 of the first section 4 coincides with the central line 1 in the ground sample line, and the error is controlled within +/-2 mm; positioning the front and back directions of the first section 4 to ensure that the rib detection line 7 on the first section 4 coincides with the rib detection line 2 of the ground sample line, and controlling the error within +/-2 mm; and positioning the levelness of the first section, wherein the levelness of the four corners 16 of the section is controlled within +/-5 mm.
After the positioning of the first section is finished, the second section 5 is positioned, and the levelness and the positioning in the front-back direction of the second section 5 are the same as those of the first section; when the second section 5 is positioned in the width direction, firstly, the width dimension of the outer contour line of the upper building block at the main deck surface connection position of the engine room is measured, then the dimension of the full width 8 of the lower opening is adjusted to be consistent with the width dimension of the outer contour line of the main deck surface connection position, the error is controlled within +/-3 mm, and the construction of the lowest upper building block part of the upper building block is completed.
After the upper building block part of the bottommost layer is completed, the upper building block part of the next layer is hoisted, as shown in fig. 4. The width direction, the front-back direction and the levelness of the second-layer superstructure total section part are positioned in the same way as those of the bottommost superstructure total section part; the lower opening structure of the second-layer upper-layer building block part is in butt joint with the upper opening structure of the first-layer upper-layer building block part (namely the bottommost upper-layer building block part), and the dislocation amount is controlled within +/-3 mm; the error between the layer height 9 between the deck surface of the second-layer superstructure total section part and the deck surface of the first-layer superstructure total section part in the height direction and the design layer height is controlled within +/-5 mm;
and completing the total group of the superstructure total section parts of the remaining floors layer by layer from bottom to top according to the total group method of the superstructure total section parts of the second floor.
3. Deck and enclosure wall flatness control
After the positioning of the superstructure block is completed, the flatness of the deck surface and the surrounding wall area of the superstructure block is measured by using the 3M or 5M level 10, as shown in fig. 5, and the control criteria of the flatness are shown in the following table:
and carrying out fire correction on the area with the flatness exceeding the control standard.
4. After the correction of the upper building block is finished, channel steel reinforcement is carried out on the upper building block lower opening surrounding wall mounting channel steel 11, and deformation in the hoisting process is prevented, as shown in fig. 6.
5. Mounting reference line arrangement
After the upper building block assembly is welded, a height datum line 13 with uniform height is marked on the periphery of the surrounding wall of the first upper building block part (namely the upper building block part of the bottommost layer) for the height positioning datum in the subsequent carrying stage; center lines 12 on the front and rear sides of the upper building block are scribed for positioning in the width direction of the subsequent mounting, as shown in fig. 7.
6. Hoisting and positioning by means of a guiding device
The first guide device 14 is installed outside the superstructure block, the second guide device 15 corresponding to the first guide device 14 is arranged on the main deck mounting and abutting surface, and the superstructure block is mounted on the main deck mounting and abutting surface by means of the first guide device 14 and the second guide device 15 in cooperation with each other. The first guide device 14 comprises an annular structure, the second guide device 15 comprises a guide column, the upper end of the guide column is conical, and the lower end of the guide column is arranged on the main deck carrying butt joint surface; the first guiding devices 14 are distributed in a triangular mode relative to the building block, the first guiding devices and the second guiding devices are in one-to-one correspondence, and the annular structure is sleeved on the guiding column along the conical end portion of the guiding column during positioning, as shown in fig. 8.
7. Onboard positioning parameter control
After the superstructure block is mounted on the main deck mounting interface, the first guide device and the second guide device are removed, the rib inspection line 7 of the superstructure block is adjusted to be aligned with the rib inspection line of the main deck mounting interface according to the alignment of the center lines 12 on the head face and the tail face of the superstructure block with the center line of the hull on the main deck mounting interface, the distance between the height datum line 13 of the superstructure block and the height datum line on the main deck mounting interface is adjusted to control the height of the superstructure block, and the superstructure block mounting accuracy control is finished.
The present embodiment is further illustrative of the present invention and is not to be construed as limiting the invention, and those skilled in the art can make no inventive modifications to the present embodiment as required after reading the present specification, but only as long as they are within the scope of the claims of the present invention.
Claims (9)
1. The method for controlling the overall assembly carrying precision of the upper building block of the LNG ship is characterized in that the upper building block is carried on a cabin main deck, and the method comprises the following steps:
building the upper building block on the jig frame according to a layered assembly from bottom to top, and hoisting the upper building block part of the lower layer after the positioning of the upper building block part of the bottommost layer is finished;
after the positioning of each part of the upper building block is finished, measuring and correcting the flatness of each deck and the surrounding wall, and reinforcing the channel steel of the lower opening surrounding wall of the upper building block;
after the upper building block is subjected to total assembly welding, a height datum line with uniform height is marked on the periphery of the surrounding wall of the upper building block part at the bottommost layer, and the center lines are respectively marked on the head and tail sides of the upper building block;
the first guiding device is arranged outside the superstructure block, the second guiding device corresponding to the first guiding device is arranged on the main deck mounting and abutting surface, and the superstructure block is mounted on the main deck mounting and abutting surface by means of the mutual matching of the first guiding device and the second guiding device.
2. The method for controlling the overall assembly carrying precision of the upper building block on the LNG ship according to claim 1, wherein the first guiding device comprises an annular structure, the second guiding device comprises a guiding column, the upper end of the guiding column is conical, and the lower end of the guiding column is arranged on a main deck carrying butt joint surface; the annular structure is sleeved on the guide post along the conical end part of the guide post during positioning.
3. The method for controlling the overall group carrying precision of the upper building block on the LNG ship according to claim 2, wherein the first guiding devices are distributed in a triangular shape with respect to the upper building block.
4. The method for controlling the overall assembly carrying precision of the upper building block on the LNG ship according to claim 1, wherein before the layered overall assembly of the upper building block is constructed, the method comprises the following steps:
step 1, scribing a ground sample line and a ground pier supporting arrangement position on a total building site of a superstructure, and arranging ground pier supports;
step 2, measuring the width of an outer contour line of the upper building block at the junction position of the main deck of the engine room, and positioning the full width of a lower opening of the upper building block part at the bottommost layer according to the width dimension of the outer contour line of the junction position of the main deck of the engine room; and positioning the width of the upper opening of the upper building block part of the next layer above the upper building block part of the next layer.
5. The method for controlling the overall assembly carrying precision of the building block on the LNG ship according to claim 4, wherein the ground sample line comprises a central line and a rib detection line, the central line and the rib detection line are mutually perpendicular, and the position of the ground pier support is determined according to the central line and the rib detection line; the angle degree of the central line and the rib detecting line is controlled within 2 mm.
6. The method for controlling the overall building block carrying precision on LNG ships according to claim 5, wherein the ground pier supporting height is adjustable, the levelness of the ground pier supporting is adjusted, and the ground pier supporting is adjusted to the design height.
7. The method for controlling the overall assembly carrying precision of the upper building block on the LNG ship according to claim 1, wherein a ship body center line, a rib inspection line and a height datum line are marked on a main deck carrying butt joint surface; after the superstructure block is mounted on the main deck mounting butt joint surface, according to the alignment of the center line on the head-tail surface of the superstructure block and the center line of the hull on the main deck mounting butt joint surface, the rib inspection line of the superstructure block is adjusted to be aligned with the rib inspection line of the main deck mounting butt joint surface, and the distance between the height datum line of the superstructure block and the height datum line on the main deck mounting butt joint surface is adjusted to control the height of the superstructure block.
8. The method for controlling the overall assembly carrying precision of the upper building block on the LNG ship according to claim 1, wherein the upper building block is layered along the position 100mm above the deck surface by taking the deck surface as a reference when the layered overall assembly is built from bottom to top.
9. LNG ship, characterized by comprising a superstructure block, which is mounted on a main deck mounting interface according to the method of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211510853.0A CN116039872A (en) | 2022-11-29 | 2022-11-29 | Method for controlling overall assembly carrying precision of building block on upper layer of LNG ship and LNG ship |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211510853.0A CN116039872A (en) | 2022-11-29 | 2022-11-29 | Method for controlling overall assembly carrying precision of building block on upper layer of LNG ship and LNG ship |
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| Publication Number | Publication Date |
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| CN116039872A true CN116039872A (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211510853.0A Pending CN116039872A (en) | 2022-11-29 | 2022-11-29 | Method for controlling overall assembly carrying precision of building block on upper layer of LNG ship and LNG ship |
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| CN (1) | CN116039872A (en) |
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- 2022-11-29 CN CN202211510853.0A patent/CN116039872A/en active Pending
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