Installation Precision Control Method for Container Ship's Box Column Segmentation Stage and Box Foot Installation Method

Abstract

The present invention relates to a method for controlling the installation accuracy of container ship box columns during the sectional stage and a method for installing box feet. The box columns are fabricated, and the thickness of the stiffeners parallel to the ship length direction inside the box columns is increased. Four stiffeners are enclosed along the outer contour position of the box feet; the outer contour line of the box feet and the center point marks of the stiffeners are marked on the top plate at the upper end of the box column; the box column is installed during the sectional stage, and the box column is positioned horizontally according to the cross point formed by connecting the center point marks of the stiffeners on the top plate at the upper end of the box column; after the installation of the box column is completed, the box feet on the hatch cover top plate are installed, and the box feet on the top plate are positioned according to the box feet on the hatch cover top plate. The present invention can reduce the problem that it is difficult to install the box feet due to the problem of box column accuracy control during the installation of the box feet on the box column in the later stage, avoid the subsequent disassembly and correction of the box column, and at the same time avoid the risks during the correction, thereby effectively shortening the cycle of the container ship box column during the dock or wharf stage.

Description

Technical Field

[0001] The present invention relates to the field of container ship construction, and particularly to a method for controlling the installation accuracy of container ship column segments and a method for installing container feet. Background Art

[0002] The column of a container ship is mainly a column structure for installing container feet on the side of the ship close to the outer plate. Its height from the hull baseline is high, and the installation belongs to relatively dangerous high-altitude work. Previously, the installation was generally carried out by dock mating or bulk installation at the dock stage. Now, many shipyards pre-install most of the container ship columns on the segments, and the remaining small part is installed after dock mating or after the ship is launched.

[0003] Although many container ship columns are selected for installation at the segment stage, due to the high precision requirements for the container feet installed on the columns, and the reinforcement of these feet is inside the container ship column and it is difficult to adjust and correct after the column is installed, only the method of making incisions on the whole column can be adopted for adjustment.

[0004] Moreover, since the column has a relatively thick plate thickness, single-sided welding is used, and during later correction, it is a high-altitude operation beside the ship's side. Therefore, there are safety hazards in the correction. If the installation accuracy of the column exceeds the tolerance, it often takes a lot of labor and time to correct. Therefore, it is particularly important to improve the installation accuracy of container ship columns at the segment stage. Summary of the Invention

[0005] In order to achieve the above object and reduce the possibility of difficult and high-risk correction of the column due to the installation accuracy of the column in the later stage, the present invention provides a method for controlling the installation accuracy of container ship column segments and a method for installing container feet.

[0006] The technical object of the present invention is achieved by the following technical solutions:

[0007] A method for controlling the installation accuracy of container ship column segments, the method comprising:

[0008] Manufacture the column, thicken the plate thickness of the stiffeners parallel to the ship length direction inside the column, and enclose the four stiffeners along the outer contour position of the container foot; by thickening the plate thickness, the adjustment tolerance during the installation of the container foot is increased, and the possibility of modification after the column is installed is reduced.

[0009] Mark the outer contour line of the container foot and the center point of the stiffener on the top plate at the upper end of the column;

[0010] Install the column at the segment stage, and position the column horizontally according to the cross point formed by connecting the center point marks of the stiffeners on the top plate at the upper end of the column.

[0011] Further, when positioning the box column horizontally, the box column is positioned according to the distance between the cross point on the upper end top plate of the box column and the edge on the middle side of the hatch coaming top plate, and the distance between the cross point and the theoretical line of the transverse bulkhead.

[0012] Further, the thickening thickness of the stiffener parallel to the ship length direction is 30 - 50 mm.

[0013] Further, after the welding of the box column is completed in the sectional stage, the position deviation of the cross point is controlled within ±3 mm.

[0014] The present invention also provides a method for installing the pedestal on the box column of a container ship. The method includes first installing the box column, and after the installation of the box column is completed, installing the pedestal on the hatch cover top plate. The pedestal on the upper end of the box column is positioned and installed according to the pedestal on the hatch cover top plate. The box column is installed according to the above-mentioned installation accuracy control method for the sectional stage of the box column of the container ship.

[0015] Further, the length of the opening of the pedestal on the top plate is greater than the length of the opening of the pedestal on the hatch cover top plate.

[0016] Further, when installing the pedestal on the box column, the pedestal on the top plate is positioned with the centers of the two openings on the pedestal on the hatch cover top plate as the reference.

[0017] Further, when installing the pedestal on the top plate, at least three stiffeners correspond to the pedestal on the top plate.

[0018] Compared with the prior art, the beneficial effect of the present invention is that through the installation accuracy control method for the sectional stage of the box column of the container ship of the present invention, the problem that it is difficult to install the pedestal due to the problem of box column accuracy control during the later installation of the pedestal on the box column can be reduced, the subsequent disassembly and correction of the box column are avoided, and the risk during the correction is also avoided. Furthermore, the cycle of the box column of the container ship in the dock or wharf stage can be effectively shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the installation schematic diagram of the box column in the present invention.

[0020] Figure 2 is the schematic diagram of marking the outer contour line of the pedestal and the center point of the stiffener on the top plate.

[0021] Figure 3 is the schematic diagram of positioning the box column in the ship length direction.

[0022] Figure 4 is the schematic diagram of positioning the box column in the ship width direction

[0023] Figure 5 is the schematic diagram of the relationship between the openings of the pedestal on the top plate and the openings of the pedestal on the hatch cover top plate.

[0024] In the figure, 1 is the box foot; 2 is the box column; 3 is the hatch coaming; 4 is the hatch cover top plate; 5 is the opening of the box foot on the top plate; 6 is the opening of the box foot on the hatch cover top plate; 7 is the theoretical line of the transverse bulkhead; 8 is the top plate; 9 is the cross point; 10 is the center point mark; 11 is the outer contour line; 12 is the stiffening plate; 13 is the hatch coaming top plate. Specific implementation mode

[0025] The technical solution of the present invention will be further described below in conjunction with the specific implementation mode:

[0026] From Figure 1 it can be seen that the purpose of installing the box column 2 is to install the box foot 1 of the container on its top plate, so as to form a container position together with the box foot 1 of the container closest to the ship's side on the hatch cover top plate 4 above the hatch coaming 3. Taking a 24000 TEU container ship as an example, the ship includes 82 container box columns, and 62 of them are box columns installed in segments, accounting for about 75.6% of the total number of box columns.

[0027] The present invention provides a method for controlling the installation accuracy of container ship box columns in the segmented stage, and the method includes:

[0028] Manufacture the box column, with a stiffening plate 12 arranged inside the box column. The thickness of the stiffening plate parallel to the ship length direction inside the box column is thickened, and the four stiffening plates enclose along the outer contour position of the box foot. Finally, the installation position of the box foot is within the range of the stiffening plate;

[0029] Mark the outer contour line 11 of the box foot and the center point mark 10 of the stiffening plate 12 on the top plate 8 at the upper end of the box column. The center point mark 10 is marked by the way of a center punch, as Figure 2 shown.

[0030] Install the box column in the segmented stage. Position the box column horizontally according to the cross point 9 formed by connecting the center point marks 10 of the stiffening plates on the top plate 8 at the upper end of the box column 2: Position the box column in the ship width direction according to the distance between the cross point 9 on the top plate at the upper end of the box column and the edge on the side facing the middle of the hatch coaming top plate, as Figure 4 shown; Position the box column 2 in the ship length direction according to the distance between the cross point 9 and the theoretical line 7 of the transverse bulkhead, as Figure 3 shown by L1, L2, L3, and L4 in

[0031] Preferably, the thickening thickness of the two stiffening plates parallel to the ship length direction is 30-50 mm. In this embodiment, the original thickness of the stiffening plate is 20 mm. After thickening by 30 mm, the thickness of the stiffening plate is 50 mm. After thickening by 50 mm, the thickness of the stiffening plate is 70 mm. There are two ways of thickening. Taking the stiffening plate with a thickness of 20 mm thickened by 30 mm as an example, a 30-mm-thick plate can be attached to one side of the 20-mm-thick stiffening plate, or a 50-mm stiffening plate can be directly selected. Taking the plate thickness of the box feet on the top plate as 12 mm as an example, for the 50-mm-thick stiffening plate, there can be a tolerance of ±19 mm when adjusting the position of the box feet, ensuring enough space for adjusting the box feet.

[0032] After the box columns are welded to the section during the section stage, the deviation of the distance between the cross point and the edge of the hatch coaming top plate facing the middle side and the distance between the cross point and the theoretical line of the transverse bulkhead should be controlled within ±3 mm.

[0033] The present invention also provides a method for installing the upper box feet on the box columns of a container ship. The method includes first installing the box columns according to the above method. After the installation of the box columns is completed, install the box feet on the hatch cover top plate, and position and install the box feet at the upper end of the box columns according to the box feet on the hatch cover top plate.

[0034] As Figure 5 shown, the length of the opening 5 of the box feet on the top plate is 254 mm, while the length of the opening 6 of the box feet on the hatch cover top plate is 124 mm. The theoretical tolerance can reach ±65 mm.

[0035] When installing the box feet on the box columns, position the box feet on the top plate with the centers of the two openings on the box feet on the hatch cover top plate as the reference. Offset a set distance from the centers of the two openings of the box feet on the hatch cover top plate to determine two points on the top plate of the box columns. Connect the two points to determine the central axis in the length direction of the box feet on the top plate. Position the box feet on the top plate according to the central axis and the two points determined on the top plate, ensuring that the central axis in the length direction of the box feet on the top plate coincides with the central axis drawn on the top plate, and the two points on the top plate are located within the two openings of the box feet on the top plate. When installing the box feet, ensure that at least three stiffening plates correspond to the box feet on the top plate.

[0036] In the height direction, there is a margin at the lower opening of the box feet on the top plate. In this embodiment, there is a 15-mm margin at the lower opening of the box feet on the top plate. Cut the margin of the box feet on the top plate according to the height of the contour line of the box feet drawn on the top plate from the hatch coaming top plate 13 to complete the positioning of the height of the box feet on the top plate. After determining the horizontal position and height position of the box feet on the top plate, weld the box feet to complete the installation of the box feet.

[0037] This embodiment is only a further explanation of the present invention and not a limitation thereof. Those skilled in the art can make non-creative modifications to this embodiment as needed after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A method for installing the upper shoe of a container ship's box column, characterized in that, The method includes first installing the box column. After the installation of the box column is completed, install the box feet on the hatch cover top plate, and position and install the box feet at the upper end of the box column according to the box feet on the hatch cover top plate. When installing according to the control method for the installation accuracy of the box column in the sectional stage, fabricate the box column, thicken the plate thickness of the stiffeners parallel to the ship length direction inside the box column, and the thickening thickness of the stiffeners parallel to the ship length direction is 30-50 mm. The four stiffeners enclose along the outer contour position of the box feet. Mark the outer contour line of the box feet and the center point of the stiffeners on the top plate at the upper end of the box column. Install the box column in the sectional stage, and position the box column horizontally according to the cross intersection points formed by connecting the center point marks of the stiffeners on the top plate at the upper end of the box column. When positioning the box column horizontally, position the box column according to the distance between the cross intersection points on the top plate at the upper end of the box column and the edge on the inboard side of the hatch coaming top plate and the distance between the cross intersection points and the theoretical line of the transverse bulkhead. The length of the opening of the box feet on the top plate is greater than the length of the opening of the box feet on the hatch cover top plate. When installing the box feet on the box column, position the box feet on the top plate with the centers of the two openings on the box feet on the hatch cover top plate as the reference. Offset by a set distance from the centers of the two openings of the box feet on the hatch cover top plate to determine two points on the top plate of the box column, connect the two points to determine the central axis in the length direction of the box feet on the top plate, and position the box feet on the top plate according to the central axis and the two determined points on the top plate, ensuring that the central axis in the length direction of the box feet on the top plate coincides with the drawn central axis on the top plate, and the two points on the top plate are located within the two openings of the box feet on the top plate. In the height direction, leave a margin at the lower opening of the box feet on the top plate, and cut the margin of the box feet on the top plate according to the height between the drawn contour line of the box feet on the top plate and the hatch coaming top plate to complete the positioning of the height of the box feet on the top plate.

2. The installation method of the upper shoe on the container column of a container ship according to claim 1, characterized in that, After welding the box column in the sectional stage, control the position deviation of the cross intersection points within ±3 mm.

3. A method for installing the upper shoe on the container column of a container ship according to claim 1, characterized in that, When installing the box feet on the top plate, at least three stiffeners correspond to the box feet on the top plate.

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