Mounting method for container feet of hatch cover of container ship

Abstract

The invention provides a container ship hatch cover box foot installation method which comprises the steps that the positions of box feet on a hatch cover are accurately determined through a plurality of marked X-direction auxiliary lines and Y-direction auxiliary lines, then the center points of the box feet are determined, and the center points of the box feet accurately fall on box foot positioning points; and when the box foot falls in place, it is ensured that the center line of the box foot in the X direction and the center line of the box foot in the Y direction fall on the X-direction auxiliary line and the Y-direction auxiliary line respectively, and it is ensured that the box foot falls in place accurately. Meanwhile, the box foot mold is used for simulating the falling position of an actual container, the position of the box foot is rechecked, it is guaranteed that the mold is completely attached to the box foot, and therefore whether position deviation occurs to the box foot or not is preliminarily detected, and follow-up reworking is avoided. According to the installation method, data are more visual and accurate, operation is convenient, a large number of resources such as crane resources, human resources and power energy used by real object pouring jackets are saved, the problem that actual pouring jacket testing at each position of the hatch cover is troublesome is solved, and the actual detection period of the hatch cover is greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of container ship construction, in particular to a method for installing a hatch cover foot of a container ship. Background Art

[0002] A rectangular hatch is formed on the deck of a common container ship for loading and unloading cargo, which is called a hatch. This hatch is closed by a hatch cover. As an important component of a super-large container ship, the hatch cover is used to stack containers. The surface of the hatch cover is welded with box feet for positioning the containers. In order to verify the accurate installation of the hatch cover box feet, after the box feet are installed in place, a crane is used to lift the container and perform a drop test on each position of the hatch cover to ensure that the container can be safely and accurately placed at each position.

[0003] In actual operation, since each ship has hundreds of hatch covers and there are many hatch cover foot points, each hatch cover foot needs to be tested in practice, which is not only time-consuming and laborious, but also occupies crane resources and affects the segmented construction period.

[0004] Therefore, how to design a method to improve the installation accuracy of hatch cover box feet has become a hot topic in the construction and improvement of large container ships. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a method for lifting the hatch cover box feet to install an accurate test container, so as to overcome the defects of the prior art such as high manpower consumption, high kinetic energy consumption, low efficiency, and long test container cycle, while ensuring that the problem of containers not being unable to fall down does not occur in the subsequent operation stage of the ship.

[0006] The present invention provides a method for installing a container ship hatch cover foot, the method comprising the following steps:

[0007] S1. Measure the height of the hatch coaming by using a total station, set the four corners of the hatch cover and each side hard stop as the positions to be measured, place a horizontal ruler on the positions to be measured, make reflective marks at a predetermined height on the horizontal ruler, measure the height of the reflective marks at each position to be measured by using a total station, calculate the height value of each position to be measured, input the measured data into a computer database for integration and analysis, and form actual accuracy data as a basis for the batch placement of box feet in the later area;

[0008] S2. Adjust the flatness of the hatch cover deck. Based on the preliminary test model data and taking the hatch cover deck as the reference, adjust the deck surface level to ensure that the deck flatness error is within the allowable value of 3mm.

[0009] S3. Draw the X-direction center line extending along the X-direction on the hatch cover. Taking the X-direction center line as a reference, locate multiple X-direction auxiliary lines parallel to the X-direction center line according to the preset spacing. The multiple X-direction auxiliary lines are arranged along the Y direction, namely X1, X2, X3, ..., Xn. After determining the positions of the multiple X-direction auxiliary lines, check the distances between the X-direction auxiliary lines to ensure that the deviation is within 1 mm.

[0010] S4, draw the Y-direction center line extending along the Y-direction on the hatch cover 11, take the Y-direction center line as a reference, and locate multiple Y-direction auxiliary lines parallel to the Y-direction center line according to a preset spacing, and the multiple Y-direction auxiliary lines are arranged along the X direction, namely Y1, Y2, Y3, ..., Yn. After determining the positions of the multiple Y-direction auxiliary lines, check the distances between the Y-direction auxiliary lines to ensure that the deviation is within 1 mm;

[0011] S5. Multiple X-direction auxiliary lines and multiple Y-direction auxiliary lines intersect to form a rectangular grid. All intersection points of the grid are marked with X1Y1, X1Y2, X1Y4, ..., XnYn. The intersection points are the box foot positioning points.

[0012] Optionally, the installation method further comprises the following steps:

[0013] S6, mark X1Y1 as A11, mark X1Y2 as A12, and so on to mark Aij, and the above marked points are counted into the database;

[0014] S7. Use a signal pen to mark the center line a1 extending along the X direction and the center line b1 extending along the Y direction on the box foot to determine the center point of the box foot so that the center point of the box foot falls accurately on the box foot positioning point; when the box foot is in place, ensure that a1 is on the X-direction auxiliary line and b1 is on the Y-direction auxiliary line.

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

[0016] S8. Spot weld to temporarily fix the box feet, put on the mold for box foot detection, ensure that the mold and box feet are completely fitted, use a distance meter to detect whether the mold center is consistent with Aij in the database, and ensure that the coordinate deviation between the mold center point and Aij is within 1mm. If it exceeds this error range, the box feet need to be readjusted.

[0017] Optionally, in step S8, the box foot is a square metal block with a rounded rectangular through hole running through it from top to bottom, and the mold includes a rounded rectangular cover plate with a limit strip vertically fixed on the surface of the rounded rectangular cover plate; when the mold is buckled onto the box foot, the limit strip is inserted into the rounded rectangular through hole and fits against the side wall of the rounded rectangular through hole.

[0018] Optionally, the installation method further comprises the following steps:

[0019] S9. Remove the mold and weld the box feet. After the hatch cover box feet are installed and welded, put on the mold again to check whether the mold center point is consistent with Aij in the database. Ensure that the deviation between the mold center point and Aij is within 2mm. If it exceeds this error range, the box feet need to be readjusted.

[0020] Optionally, the installation method further comprises the following steps:

[0021] S10. After all the container feet are positioned and welded, all the above data are modeled and stored in the database, and the test container is simulated using the test data in the database to ensure that the container can be dropped smoothly in theory; then a crane is used to carry out a physical drop test using a 20-foot standard container to ensure that the container at each position can be dropped smoothly.

[0022] As described above, the present invention provides a method for installing the foot of a container ship hatch cover, which accurately determines the position of the foot on the hatch cover by drawing a plurality of X-direction auxiliary lines and Y-direction auxiliary lines, and then determines the center point of the foot, so that the center point of the foot accurately falls on the foot positioning point, and ensures that the center line of the foot along the X direction and the center line of the foot along the Y direction fall on the X-direction auxiliary line and the Y-direction auxiliary line respectively when the foot is in place, so as to ensure that the foot is accurately placed. At the same time, the foot mold is also used to simulate the actual placement of the container, and the foot position is checked to ensure that the mold is completely fitted with the foot, so as to preliminarily detect whether the foot itself has position deviation, so as to avoid subsequent rework.

[0023] This installation method makes the data more intuitive and accurate, and is easy to operate. It saves a lot of resources used for physical box fittings, such as crane resources, human resources and power energy, solves the trouble of actual box fitting testing at each position of the hatch cover, controls a large amount of material and labor costs for the shipyard, speeds up the construction of the hatch cover, and shortens the actual inspection cycle of the hatch cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic diagram of the marking on the surface of the hatch cover in the first embodiment of the present invention.

[0025] Figure 2 Shown is a side view schematic diagram of the hatch cover and the box foot in the first embodiment of the present invention.

[0026] Figure 3 It shows a schematic diagram of the adaptation of the box foot and the box foot mold in the first embodiment of the present invention.

[0027] Figure 4 Shown is a top view of the box foot mold in Example 1 of the present invention.

[0028] Figure 5 Shown is a top view of the box foot in the first embodiment of the present invention.

[0029] Component number description

[0030] Hatch cover 11; box foot 12; mold 13; rounded rectangular through hole 121; limit strip 131. DETAILED DESCRIPTION

[0031] 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.

[0032] For example, when describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic view is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0033] For ease of description, spatial relational terms such as "under", "below", "below", "below", "above", "on", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relational terms are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can be one or more intervening layers. As used herein, "between..." means including the end point values.

[0034] In the context of the present application, a structure in which a first feature is described as being "above" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0035] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and therefore 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. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] The present invention adopts a data simulation method to import the hatch cover three-dimensional model into the database, and imports the box foot detection accuracy data to simulate the container landing. When it is theoretically feasible, a certain proportion of locations are randomly selected to conduct physical container tests for verification. When all container tests pass, it indicates that the data simulation test box solution is feasible, which is specifically explained through embodiments below.

[0037] Embodiment 1

[0038] This embodiment provides a method for installing a container ship hatch cover foot, such as Figures 1 to 5 As shown, the following steps are included:

[0039] S1. Measure the height of the hatch coaming by total station. Set the four corners of the hatch cover 11 and each side hard block as the positions to be measured, place a horizontal ruler on the positions to be measured, make a reflective mark at a predetermined height (such as 100m) on the horizontal ruler, measure the height of the reflective mark at each position to be measured by total station, calculate the height value of each position to be measured, input the measured data into the computer for integration and analysis, and form actual accuracy data as a basis for the batch placement of box feet in the later area.

[0040] S2. Adjust the flatness of the hatch cover 11 deck. According to the preliminary test model data, take the hatch cover deck as the reference, adjust the deck surface level, and ensure that the deck flatness error is within the allowable value of 3mm and the limit value is within 4mm (the minimum distance between a strong frame is 3000mm).

[0041] S3. Draw the X-direction center line extending along the X-direction on the hatch cover 11. Taking the center line as a reference, multiple X-direction auxiliary lines parallel to the X-direction center line are positioned according to a preset spacing. The multiple X-direction auxiliary lines are arranged along the Y direction, namely X1, X2, X3, ..., Xn. After determining the positions of the multiple X-direction auxiliary lines, the distances between the X-direction auxiliary lines are reviewed to ensure that the deviation is within 1 mm.

[0042] S4. Draw the Y-direction center line extending along the Y-direction on the hatch cover 11. Taking the center line as a reference, multiple Y-direction auxiliary lines parallel to the Y-direction center line are positioned according to preset spacing. The multiple Y-direction auxiliary lines are arranged along the X-direction, namely Y1, Y2, Y3, ..., Yn. After determining the positions of the multiple Y-direction auxiliary lines, the distances between the Y-direction auxiliary lines are reviewed to ensure that the deviation is within 1 mm.

[0043] S5. Multiple X-direction auxiliary lines and multiple Y-direction auxiliary lines intersect to form a rectangular grid, and all intersections of the grid are marked with X1Y1, X1Y2, X1Y4, ..., XnYn. Among them, the preset spacing of steps S3 and S4 needs to be determined according to the size of the container, usually the length or width of the container to be loaded, and the intersection is the box foot positioning point so that the container falls on the box foot.

[0044] S6. For the convenience of registration, mark X1Y1 as A11, mark X1Y2 as A12, and so on to mark Aij. The above marked points are recorded in the database.

[0045] S7. Use a signal pen to mark the center line a1 extending along the X direction and the center line b1 extending along the Y direction on the box foot, determine the center point of the box foot, and make the center point of the box foot accurately fall on the box foot positioning point. When the box foot is placed, ensure that a1 is on the X-direction auxiliary line and b1 is on the Y-direction auxiliary line. When both points are met at the same time, the box foot can be guaranteed to be accurately placed.

[0046] S8. After the above work, spot weld the temporary fixed box foot 12, and put on the mold 13 for testing the box foot 12 (refer to the attached Figure 5 ), ensure that the mold 13 and the box foot 12 are completely fitted, and use a rangefinder to detect whether the center of the mold 13 is fitted with Aij in the database. The specific implementation method is to check the coordinate value Xm of the center of the mold 13 along the X direction and the coordinate difference in the database, check the coordinate value Ym of the center of the mold along the Y direction and the coordinate difference in the database, and ensure that the coordinate deviation between the center point of the mold and Aij is within 1mm. If it exceeds this error range, the box foot needs to be readjusted.

[0047] The box foot 12 is a square metal block, and a rounded rectangular through hole 121 is opened in the square metal block and passes through it from top to bottom. The mold 13 includes a rounded rectangular cover plate, and a limit strip 131 is vertically fixed on the surface of the rounded rectangular cover plate. When the mold 13 is buckled on the box foot 12, the limit strip 131 is inserted into the rounded rectangular through hole 121 and fits with the side wall of the rounded rectangular through hole 121.

[0048] The box foot mold is used to simulate the actual placement of the container, so as to preliminarily detect whether the box foot itself has deviations such as displacement and tilt, so as to avoid subsequent rework.

[0049] S9, remove the mold and weld the box feet. After the hatch cover box feet are installed and welded, put on the box foot mold again to check whether the mold center point fits with Aij in the database. The specific implementation method is to check the coordinate value Xm of the mold center along the X direction and the coordinate difference in the database, check the coordinate value Ym of the mold center along the Y direction and the coordinate difference in the database, and ensure that the deviation between the mold center point and Aij is within 2mm. If it exceeds this error range, the box feet need to be readjusted.

[0050] S10. After all the box feet are positioned and welded, all the above data are modeled and stored in the database, and the test box is simulated using the test data in the database to ensure that the box can be dropped smoothly in theory. A crane is used to carry out a physical drop test using a 20-foot standard container to ensure that each position can be dropped smoothly.

[0051] In summary, the present invention provides a method for installing the foot of a container ship hatch cover, which accurately determines the position of the foot on the hatch cover by drawing a plurality of X-direction auxiliary lines and Y-direction auxiliary lines, and then determines the center point of the foot, so that the center point of the foot accurately falls on the foot positioning point, and ensures that the center line of the foot along the X direction and the center line of the foot along the Y direction fall on the X-direction auxiliary line and the Y-direction auxiliary line respectively when the foot is in place, so as to ensure that the foot is accurately placed. At the same time, the foot mold is also used to simulate the actual placement of the container, and the foot position is checked to ensure that the mold is completely fitted with the foot, so as to preliminarily detect whether the foot itself has position deviation, so as to avoid subsequent rework.

[0052] This installation method makes the data more intuitive and accurate, and is easy to operate. It saves a lot of resources used for physical box fittings, such as crane resources, human resources and power energy, solves the trouble of actual box fitting testing at each position of the hatch cover, controls a large amount of material and labor costs for the shipyard, speeds up the construction of the hatch cover, and shortens the actual inspection cycle of the hatch cover.

[0053] 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 installing a container ship hatch cover foot, characterized in that: The installation method comprises the following steps: S1. Measure the height of the hatch coaming by using a total station, set the four corners of the hatch cover and each side hard stop as the positions to be measured, place a horizontal ruler on the positions to be measured, make reflective marks at a predetermined height on the horizontal ruler, measure the height of the reflective marks at each position to be measured by using a total station, calculate the height value of each position to be measured, input the measured data into a computer database for integration and analysis, and form actual accuracy data as a basis for the batch placement of box feet in the later area; S2. Adjust the flatness of the hatch cover deck. Based on the preliminary test model data and taking the hatch cover deck as the reference, adjust the deck surface level to ensure that the deck flatness error is within the allowable value of 3mm. S3. Draw the X-direction center line extending along the X-direction on the hatch cover. Taking the X-direction center line as a reference, locate multiple X-direction auxiliary lines parallel to the X-direction center line according to the preset spacing. The multiple X-direction auxiliary lines are arranged along the Y direction, namely X1, X2, X3, ..., Xn. After determining the positions of the multiple X-direction auxiliary lines, check the distances between the X-direction auxiliary lines to ensure that the deviation is within 1 mm. S4, draw the Y-direction center line extending along the Y-direction on the hatch cover 11, take the Y-direction center line as a reference, and locate multiple Y-direction auxiliary lines parallel to the Y-direction center line according to a preset spacing, and the multiple Y-direction auxiliary lines are arranged along the X direction, namely Y1, Y2, Y3, ..., Yn. After determining the positions of the multiple Y-direction auxiliary lines, check the distances between the Y-direction auxiliary lines to ensure that the deviation is within 1 mm; S5. Multiple X-direction auxiliary lines and multiple Y-direction auxiliary lines intersect to form a rectangular grid. All intersection points of the grid are marked with X1Y1, X1Y2, X1Y4, ..., XnYn. The intersection points are the box foot positioning points.

2. The method for installing the container ship hatch cover foot according to claim 1, characterized in that: The installation method also includes the following steps: S6, mark X1Y1 as A11, mark X1Y2 as A12, and so on to mark Aij, and the above marked points are counted into the database; S7. Use a signal pen to mark the center line a1 extending along the X direction and the center line b1 extending along the Y direction on the box foot to determine the center point of the box foot so that the center point of the box foot falls accurately on the box foot positioning point; when the box foot is in place, ensure that a1 is on the X-direction auxiliary line and b1 is on the Y-direction auxiliary line.

3. The method for installing the container ship hatch cover foot according to claim 2, characterized in that: The installation method also includes the following steps: S8. Spot weld to temporarily fix the box feet, put on the mold for box foot detection, ensure that the mold and box feet are completely fitted, use a distance meter to detect whether the mold center is consistent with Aij in the database, and ensure that the coordinate deviation between the mold center point and Aij is within 1mm. If it exceeds this error range, the box feet need to be readjusted.

4. The method for installing the container ship hatch cover foot according to claim 3, characterized in that: In step S8, the box foot is a square metal block with a rounded rectangular through hole running through it from top to bottom, and the mold includes a rounded rectangular cover plate with a limit strip vertically fixed on the surface of the rounded rectangular cover plate; when the mold is buckled onto the box foot, the limit strip is inserted into the rounded rectangular through hole and fits against the side wall of the rounded rectangular through hole.

5. The method for installing the container ship hatch cover foot according to claim 4, characterized in that: The installation method also includes the following steps: S9. Remove the mold and weld the box feet. After the hatch cover box feet are installed and welded, put on the mold again to check whether the mold center point is consistent with Aij in the database. Ensure that the deviation between the mold center point and Aij is within 2mm. If it exceeds this error range, the box feet need to be readjusted.

6. The method for installing the container ship hatch cover foot according to claim 5, characterized in that: The installation method also includes the following steps: S10. After all the container feet are positioned and welded, all the above data are modeled and stored in the database, and the test container is simulated using the test data in the database to ensure that the container can be dropped smoothly in theory; then a crane is used to carry out a physical drop test using a 20-foot standard container to ensure that the container at each position can be dropped smoothly.

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