A method for controlling the installation accuracy of heavy-lift ship box feet

Abstract

The present invention relates to a method for controlling the precision of a heavy-lift ship's box foot, comprising: step 1, drawing two reference lines; step 2, calculating the angular scale deviation of the two reference lines; step 3, drawing a reference side margin line; step 4, drawing a box foot installation position line according to the reference line, and checking the precision of the box foot installation line of the same box position; step 5, aligning the box foot hole center line with the box foot installation line to position, install and weld the box foot; step 6, connecting the outermost box foot hole center lines on the segmented body to form a rectangular frame, drawing a re-inspection reference line in reverse with the rectangular frame as a reference, and adjusting the reference line to be consistent with the re-inspection reference line; step 7, confirming the end face margin of the segmented body according to the final reference line and performing margin trimming; step 8, connecting all lines by sample punching marks in the general assembly stage, and using the sample punching mark connection line to perform segment positioning in the general assembly stage. The present invention controls the errors in each stage, eliminates the influence of cumulative errors, and ensures the installation precision of subsequent box feet.

Description

Technical Field

[0001] The invention relates to the field of shipbuilding, and in particular to a method for controlling the installation accuracy of a heavy-lift ship box foot. Background Art

[0002] The installation accuracy of the heavy-lift ship's container feet directly affects whether the standard container can be placed and locked smoothly. The deviation between the dimensions of the container feet in each container position and the theoretical dimensions should be less than 3mm. Since the container feet are embedded in the segmented deck and require a lot of welding work to connect with the segmented body, the welding process will produce a large deformation, which will cause the spatial position of the container feet in the segment to change, resulting in an out-of-tolerance size of the container feet.

[0003] The box feet are pre-installed after the section is completed. Due to the section division method, there are box feet in the same box position between adjacent sections. During the overall assembly loading stage, it is necessary to ensure that the hull accuracy error is less than 5mm, and the size of the same box position in the section must be less than 3mm deviation. Summary of the invention

[0004] In order to meet the above-mentioned objectives, the present invention provides a method for controlling the installation accuracy of a heavy-lift ship box foot, which reduces or avoids the errors at each stage and eliminates the influence of cumulative errors to meet the accuracy requirements of construction.

[0005] The technical objectives of the present invention are achieved through the following technical solutions:

[0006] A method for controlling the accuracy of a heavy-lift ship box foot, the method comprising the following steps:

[0007] Step 1: After the segment body welding and pyrotechnic operation are completed, check whether the segment body accuracy meets the requirements. If it meets the requirements, draw a reference line on the segment body along the two reference edges in the vertical direction respectively;

[0008] Step 2: Calculate the angular scale deviation of the two reference lines compared with the theoretical value. If the angular scale deviation exceeds 3 mm, adjust the reference line angle until the angular scale deviation of the reference line does not exceed 3 mm.

[0009] Step 3: Draw a reference edge allowance line on the segmented body, and the reference edge allowance line is parallel to the reference line;

[0010] Step 4: Draw the box foot installation position line on the segmented body according to the reference line, and check the accuracy of the box foot installation line of the four box feet in the same box position, and control the accuracy of the box foot installation line of the four box feet in the same box position;

[0011] Step 5: There is a center line of the box foot holes on the box foot. Align the center line of the box foot holes with the box foot installation line to position, install and weld the box foot.

[0012] Step 6: After welding, take the box foot as the reference, connect the box foot hole center line of the outermost box foot on the segmented body to form a rectangular frame, measure whether the angle ruler deviation of the rectangular frame exceeds 3mm, if not, draw the re-inspection reference line in reverse direction with the rectangular frame as the reference, if the reference line deviates from the re-inspection reference line, adjust the reference line until the reference line and the re-inspection reference line are consistent and used as the final reference line, and perform sample punching marks on the final reference line and the box foot hole center line;

[0013] Step 7: confirm the end face margin of the segmented body according to the final reference line and perform margin trimming;

[0014] Step 8: Connect all lines by sample punch marks in the overall group stage, and use sample punch mark lines for segment positioning in the overall group stage.

[0015] Furthermore, the lengths of the two reference lines in step 1 are a and b respectively, and the angular dimension c of the two reference lines satisfies a 2 +b 2 =c 2 , calculate the deviation between the angular scale of these two reference lines and the theoretical angular scale.

[0016] Furthermore, in step 4, the accuracy of the box foot installation lines of the four box feet corresponding to the same box position includes dimensional accuracy and square ruler deviation, the dimensional deviation is less than 1 mm, and the square ruler deviation is less than 3 mm.

[0017] Furthermore, symmetrical welding is adopted when welding the box feet.

[0018] Furthermore, after the final baseline and the center line of the box foot hole are sampled and punched in step 6, the final baseline and the center line of the box foot hole are covered and protected.

[0019] Furthermore, when detecting the accuracy of the segmented body in step 1, the three-dimensional data of the segmented body is measured and the collected three-dimensional data of the segmented body is compared with the three-dimensional data of the design model of the segmented body to ensure that the construction accuracy of the segmented body meets the requirements.

[0020] Compared with the prior art, the beneficial effect of the present invention is that the present invention eliminates the influence of cumulative errors through error control at each stage, thereby providing a guarantee for the installation accuracy of the box feet during the subsequent segmented assembly, improving the construction accuracy and ensuring the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the baseline arrangement in an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of box foot installation marking in an embodiment of the present invention.

[0023] Figure 3It is a schematic diagram of a rectangular frame drawn along the center line of the outermost box foot holes in an embodiment of the present invention.

[0024] Figure 4 Schematic diagram of calculating the angular scale of the reference line in an embodiment of the present invention.

[0025] Figure 5 It is a schematic diagram of the segmented overall group in an embodiment of the present invention.

[0026] In the figure, 1. reference edge; 2. reference line; 3. segmented body; 4. box foot installation position line; 5. rectangular frame; 6. box foot; 7. re-inspection reference line; 8. final reference line; 9. box position. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with specific embodiments:

[0028] A method for controlling the accuracy of a heavy-lift ship box foot, the method comprising the following steps:

[0029] Step 1: After the welding and pyrotechnic operations of the segmented body are completed, check whether the accuracy of the segmented body meets the requirements. Use a total station to measure the three-dimensional data of the segmented body and compare the collected three-dimensional data of the segmented body 3 with the three-dimensional data of the design model of the segmented body to ensure that the construction accuracy of the segmented body meets the requirements. If it meets the requirements, draw a reference line 2 on the two reference edges 1 in the vertical direction on the segmented body, and the lengths of the two reference lines 2 are a and b respectively.

[0030] Step 2: Calculate the angular scale deviation of the two reference lines 2 compared with the theoretical value. The angular scale is c, and c satisfies a 2 +b 2 =c 2 ,like Figure 1 and Figure 4 As shown, the deviation between the angular scale of the two reference lines and the theoretical angular scale is calculated. If the angular scale deviation exceeds 3 mm, the reference line angle is adjusted until the angular scale deviation of the reference line does not exceed 3 mm.

[0031] When adjusting the angle of the reference line, follow the following principles:

[0032] When adjusting the reference line, the deviation relative to the reference edge shall not exceed 3mm each time, and one of the reference lines shall be adjusted first. If the adjustment of one reference line cannot meet the angular scale deviation requirement, both reference lines shall be adjusted.

[0033] Step 3: Draw the reference edge allowance line on the segmented body. At this time, only draw the reference edge allowance line, and the allowance is not cut temporarily. The reference edge allowance line is parallel to the reference line.

[0034] Step 4: Draw the box foot installation position line 4 on the segmented body according to the reference line. Figure 2 As shown, the accuracy of the box foot installation lines of the four box feet at the same box position is checked, and the accuracy of the box foot installation lines of the four box feet at the same box position is controlled. The accuracy of the box foot installation lines of the four box feet corresponding to the same box position includes dimensional accuracy and angle ruler deviation. The dimensional deviation is less than 1mm, and the angle ruler deviation is less than 3mm.

[0035] Step 5: There is a center line of the box foot holes on the box feet. Align the center line of the box foot holes with the box foot installation line to position, install and weld the box feet. Use symmetrical welding to reduce the error caused by shrinkage due to welding first.

[0036] Step 6: After welding, take the box foot as the reference, connect the box foot holes of the outermost box foot 6 on the segmented body along the center line to form a rectangular frame 5, as shown in FIG. Figure 3 As shown, measure whether the angle ruler deviation of the rectangular frame exceeds 3mm. If it does not exceed, draw the re-inspection baseline in reverse based on the rectangular frame. If the baseline deviates from the re-inspection baseline, adjust the baseline until the baseline and the re-inspection baseline are consistent and use them as the final baseline. Mark the final baseline 8 and the center line of the box foot holes, and then cover and protect the final baseline and the center line of the box foot holes with tape.

[0037] Step 7: confirm the end face margin of the segmented body according to the final reference line and perform margin trimming;

[0038] Step 8: Figure 5 As shown, all lines are connected by sample punch marks in the general assembly stage, and segment positioning is carried out by using sample punch mark connecting lines in the general assembly stage. During the general assembly, the overall main dimension deviation is controlled to be less than 5mm, and the box foot dimension deviation of the same box position 9 across segments is less than 3mm.

[0039] This embodiment is only a further explanation of the present invention, not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims

1. A method for controlling the precision of heavy-lift ship box feet, characterized in that: The method comprises the following steps: Step 1: After the segment body welding and pyrotechnic operation are completed, check whether the segment body accuracy meets the requirements. If it meets the requirements, draw a reference line on the segment body along the two reference edges in the vertical direction respectively; the lengths of the two reference lines are a and b respectively, and the angular scale c of the two reference lines satisfies a2+b2=c2, and calculate the deviation between the angular scale of the two reference lines and the theoretical angular scale; Step 2: Calculate the angular scale deviation of the two reference lines compared with the theoretical value. If the angular scale deviation exceeds 3 mm, adjust the reference line angle until the angular scale deviation of the reference line does not exceed 3 mm. Step 3: Draw a reference edge allowance line on the segmented body, and the reference edge allowance line is parallel to the reference line; Step 4: Draw the box foot installation position line on the segmented body according to the reference line, and check the accuracy of the box foot installation line of the four box feet in the same box position, and control the accuracy of the box foot installation line of the four box feet in the same box position; Step 5: There is a center line of the box foot holes on the box foot. Align the center line of the box foot holes with the box foot installation line to position, install and weld the box foot. Step 6: After welding, take the box foot as the reference, connect the box foot hole center lines of the outermost box foot on the segmented body to form a rectangular frame, measure whether the angle ruler deviation of the rectangular frame exceeds 3mm, if not, draw the re-inspection reference line in reverse direction with the rectangular frame as the reference, if the reference line deviates from the re-inspection reference line, adjust the reference line until the reference line and the re-inspection reference line are consistent and used as the final reference line, and mark the final reference line and the box foot hole center line with sample punching; after the final reference line and the box foot hole center line are sample punched, cover and protect the final reference line and the box foot hole center line; Step 7: confirm the end face margin of the segmented body according to the final reference line and perform margin trimming; Step 8: Connect all lines by sample punch marks in the overall group stage, and use sample punch mark lines for segment positioning in the overall group stage.

2. A method for controlling the precision of heavy-lift ship box feet according to claim 1, characterized in that: In step 4, the accuracy of the box foot installation lines of the four box feet corresponding to the same box position includes dimensional accuracy and square ruler deviation, the dimensional deviation is less than 1 mm, and the square ruler deviation is less than 3 mm.

3. A method for controlling the precision of heavy-lift ship box feet according to claim 1, characterized in that: Symmetrical welding is adopted when welding the box feet.

4. A method for controlling the precision of heavy-lift ship box feet according to claim 1, characterized in that: When detecting the accuracy of the segmented body in step 1, the three-dimensional data of the segmented body is measured and the collected three-dimensional data of the segmented body is compared with the three-dimensional data of the design model of the segmented body to ensure that the construction accuracy of the segmented body meets the requirements.

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