Segmented preassembling precision management method based on pipe fitting-out precision control

Abstract

The invention provides a segmented preassembling precision management method based on pipe fitting-out precision control. The method comprises the following steps: adjusting a design theory reference into an engineering reference to unify a fitting-out reference; the precision priority of pipe fitting-out is determined, and the tolerance of pipe fitting-out is adjusted; the fitting-out sequence of the pipes is defined, and the sections are installed from the exterior to the interior with the folded pipes as the benchmark; and measuring the mounting precision of the closure pipe based on the engineering benchmark so as to perform precision control on the position of the closure pipe. By means of the method, the segmented preassembling precision management process can be established, timely discovery, timely analysis, timely summarization, timely feedback and timely change are achieved, and various cost losses caused by precision errors of pipe outfitting are avoided.

Description

Technical Field

[0001] The present invention relates to the field of pipe outfitting, and in particular to a segmented pre-installation accuracy management method based on pipe outfitting accuracy control. Background Art

[0002] In the field of shipbuilding, the control of construction accuracy errors is an extremely important matter. After analyzing the errors in shipbuilding, it was found that there are two main sources of errors: hull error and pipe and outfitting error. Hull errors are mainly caused by the inherent characteristics of shipbuilding, and various error problems are bound to exist throughout the entire cycle. For example, the harsh on-site construction environment makes it impossible to use high-precision instruments to assist in control; manual operation makes it difficult to control the accuracy error in the actual production process; the heating and stress conditions during hull construction are relatively complex, causing some structures to deform, affecting subsequent accuracy predictions. The main reasons for pipe and outfitting errors are as follows: first, there are errors in product manufacturing dimensions; second, construction personnel lack accurate understanding of accuracy control; third, design errors, lack of main positioning dimensions, and failure to consider on-site construction environment factors. At present, due to the large number of problems that cause errors mentioned above, the scrap rate of installation between pipe and outfitting parts and the hull is high, affecting the accuracy control of pipe and outfitting. Summary of the invention

[0003] In view of the shortcomings of the related technologies mentioned above, an object of the present invention is to provide a segmented pre-installation accuracy management method based on pipe outfitting accuracy control, which is used to solve the problem of high scrap rate in the installation between pipe outfitting parts and the hull in the related technologies.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides a segmented pre-installation accuracy management method based on pipe outfitting accuracy control, the method comprising:

[0005] Adjust the design theory benchmark to the engineering benchmark to unify the outfitting benchmark;

[0006] Determine the accuracy priority of pipe and outfitting and adjust the tolerance of pipe and outfitting;

[0007] The order of pipe installation should be clarified, and the pipes should be installed from the outside to the inside of the sections based on the closed pipes;

[0008] The installation accuracy of the closing pipe is measured based on the engineering benchmark to control the accuracy of the position of the closing pipe.

[0009] Optionally, the engineering benchmark is determined based on a placement state of the segment, and the placement state of the segment is divided into a normal placement and an inverse placement.

[0010] Optionally, the design theoretical datum includes a theoretical center line, a theoretical baseline and a theoretical rib position line No. 0, and the engineering datum includes a bow and stern direction datum, a half-width direction datum and a height direction datum.

[0011] Optionally, the placement state of the segment is normal placement, and the bow and stern direction reference is based on the large transverse bulkhead. If there is no large transverse bulkhead in the segment, the strong structure in the segment is used as the reference; the semi-width direction reference is based on the center line of the segment. If the segment is an asymmetric structure, the main longitudinal bulkhead in the segment is used as the reference; the height direction reference is based on the deck surface where the pipe outfitting is located.

[0012] Optionally, the placement state of the segments is reverse placement, the fore and stern direction reference is based on the transverse large bulkhead, the half-width direction reference is based on the T row, and the height direction reference is based on the deck surface where the pipe outfitting is located.

[0013] Optionally, the steps of determining the accuracy priority of pipe outfitting and adjusting the tolerance of pipe outfitting are: comparing the tolerance of the pipe and the tolerance of the hull to determine which one has a higher accuracy requirement as the main one, and adjusting the other one according to the higher accuracy.

[0014] Optionally, the measuring of the installation accuracy of the closed pipe takes the flange on the closed pipe as the measuring object.

[0015] Optionally, four midpoints are marked in the upper, lower, left and right directions of the flange, and two midpoints in the upper and lower directions and two midpoints in the left and right directions of the flange are connected to form two intersecting midlines, and the two midpoints are used as reference lines for measuring installation accuracy.

[0016] Optionally, the precision control includes horizontal precision control, vertical precision control and key precision dimensions, and the key precision dimensions include the angular precision and flatness of the flange.

[0017] Optionally, the angle accuracy control standard of the flange is ≤1mm.

[0018] As described above, the segmented preinstallation accuracy management method based on pipe outfitting accuracy control of the present invention has the following beneficial effects: by adjusting the design theoretical benchmark to the engineering benchmark, the unification of the drawings and the on-site construction benchmark is achieved, the installation benchmark of the segmented preinstalled pipes is ensured, the outfitting benchmark of the preinstalled pipes is unified, and the cumulative error is reduced. The unification of the segmented preinstalled pipes and the hull accuracy is achieved by determining the accuracy priority of the pipe outfitting and adjusting the tolerance of the pipe outfitting; the traditional preinstalled pipes have no standard and fixed detection method after installation, resulting in a high scrap rate when the total section is closed. By clarifying the preinstalled pipe accuracy detection method, the accuracy of the segmented preinstalled pipes can be effectively controlled. Through the present invention, a segmented preinstallation accuracy management process can be established to achieve timely discovery, timely analysis, timely summary, timely feedback, and timely changes, thereby avoiding various cost losses caused by accuracy errors in pipe outfitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1Shown is a flow chart of the control method in an embodiment of the present invention.

[0020] Figure 2 It shows a schematic diagram of marking the cross center line of a flange in an embodiment of the present invention.

[0021] Figure 3 Shown is a schematic diagram of measuring the vertical flange angle in an embodiment of the present invention.

[0022] Figure 4 Shown is a schematic diagram of measuring the horizontal flange angle in an embodiment of the present invention.

[0023] Figure 5 Shown is a schematic diagram of the accuracy measurement of the pre-installed tube when the segmented normal placement is performed in an embodiment of the present invention.

[0024] Figure 6 It is a schematic diagram showing the accuracy measurement of the pre-installed tube when the pre-installed tube is placed in a segmented reverse state according to an embodiment of the present invention.

[0025] Component number description

[0026] Steps S1 to S4 DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] like Figure 1 As shown, in the process of building a ship, pipes are usually pre-installed on the sections. When different sections are assembled together, the pre-installed pipes on the different sections are closed to form a complete pipe system. Due to design errors, manufacturing errors, and installation errors in the construction process, there is a problem of out-of-tolerance when the pipe mouth is closed, resulting in a high scrap rate. This embodiment provides a segment pre-installation accuracy management method based on pipe outfitting accuracy control, which can improve the installation accuracy of pre-installed pipes and reduce the scrap rate. The method specifically includes:

[0033] S1. Adjust the design theory benchmark to the engineering benchmark to unify the outfitting benchmark.

[0034] In the traditional method, the design theoretical datum is used as the datum for positioning during the pipe outfitting process, wherein the design theoretical datum includes the theoretical center line, the theoretical baseline and the theoretical 0 rib position line. For example, the pre-installed pipe on one segment uses the theoretical center line as the reference datum, and the pre-installed pipe on the other segment uses the theoretical baseline as the reference datum. Since the datums of the pre-installed pipes on the two segments are not unified during outfitting, when the two segments are assembled, the pre-installed pipes on the two segments are prone to error accumulation, which leads to the situation that they cannot be closed.

[0035] The engineering benchmark is different from the design theory benchmark. The structure on the segment is usually used as the reference benchmark. When positioning the pre-installed pipe, it will be measured by the benchmarks in three dimensions. The specific engineering benchmarks include the bow and stern direction benchmark, the half-width direction benchmark, and the height direction benchmark. By adopting the engineering benchmark, the outfitting benchmarks of the pre-installed pipes on different segments can be unified to reduce the accumulation of errors.

[0036] During the construction of the segment, the placement state of the segment is divided into normal placement and reverse placement. According to the different placement states of the segment, the structure selected as the engineering benchmark on the segment will be different. The placement state of the segment is normal placement. The fore and stern direction benchmark is based on the transverse bulkhead. If there is no transverse bulkhead in the segment, the strong structure in the segment is used as the benchmark. Usually, the first strong structure closest to the construction benchmark of the segment is selected; the half-width direction benchmark is based on the center line of the segment. If the segment is an asymmetric structure, the main longitudinal bulkhead in the segment is used as the benchmark; the height direction benchmark is based on the deck surface where the pipe outfitting is located. Among them, the transverse bulkhead and the main longitudinal bulkhead are through structures, that is, the transverse bulkhead and the main longitudinal bulkhead will penetrate different segments. When the transverse bulkhead is selected as the benchmark, the pre-installed pipes on different segments can be positioned with the same benchmark. Therefore, by selecting the transverse bulkhead and the main longitudinal bulkhead, the outfitting benchmark of the pre-installed pipes on different segments can be unified, thereby reducing the error accumulation.

[0037] The placement state of the sections is reverse placement, with the fore and stern directions based on the transverse bulkhead, the half-width direction based on the T-row, and the height direction based on the deck surface where the pipes and outfitting are located.

[0038] S2. Determine the accuracy priority of pipe and outfitting and adjust the tolerance of pipe and outfitting.

[0039] Before installing the pipe, first compare the accuracy of the pipe with the accuracy of the hull. By comparing the tolerance of the pipe and the tolerance of the hull, determine which one has higher accuracy as the main one, and adjust the accuracy of the other one according to the higher accuracy. By doing so, the accuracy of the pipe and the hull structure can be unified, the accuracy of the pipe outfitting can be improved, and thus accuracy control can be achieved.

[0040] S3. Clarify the order of pipe installation, and install from the outside to the inside of the section based on the closed pipe.

[0041] The closing pipe is a pipe on the segment used to connect with pipes on other segments. Since the closing pipe needs to be connected with pipes on other segments, the positioning accuracy of the closing pipe needs to be guaranteed. The closing pipe is installed from the outside of the segment to the inside based on the closing pipe to complete the installation of the pipe system. After the same pipeline is installed, measure the positioning accuracy of the closing pipe to see if it meets the accuracy requirements.

[0042] S4. Measure the installation accuracy of the closing pipe based on the engineering benchmark to control the accuracy of the position of the closing pipe.

[0043] Since pipes are usually connected by flanges, the flange on the closed pipe is used as the measurement object for measuring the installation accuracy of the closed pipe. When the flange is used as the measurement object, a cross-center line must be drawn on the flange first. The cross-center line is used as a reference line for measurement. The steps for drawing the cross-center line are as follows: draw four midpoints in the four directions of the flange, connect the two midpoints in the upper and lower directions and the two midpoints in the left and right directions of the flange to form two intersecting midpoints. The two midpoints are used as reference lines for measuring installation accuracy. For example, Figure 2 As shown, use a ruler to measure the midpoint between the two screw holes on the upper part of the flange, and then use the same operation to measure the midpoints of the lower, left and right parts of the flange, and then connect the two midpoints above and below the flange and the two midpoints on the left and right sides of the flange to form a cross midline.

[0044] In order to ensure the installation accuracy of the closing tube, the position accuracy of the closing tube needs to be controlled from multiple dimensions. The accuracy control of the closing tube includes horizontal accuracy control, vertical accuracy control and key accuracy dimension control. The key accuracy dimensions include the angular accuracy and flatness of the flange. Horizontal accuracy control refers to controlling the position of the flange in the horizontal direction. The horizontal position of the flange is located by the bow and stern direction reference and the half-width direction reference; vertical accuracy control refers to controlling the position of the flange in the height direction. The position of the flange in the height direction is located by the height direction reference; the angular accuracy of the flange is located by different references according to the different setting positions of the flange, such as Figure 3 and Figure 4 As shown in the figure, if the flange is in a vertical state, the accuracy is confirmed by pulling a line, that is, using a plumb line to measure the position between the two farthest screw holes on the flange (whether they are on the same straight line), or by measuring the distance between the screw holes on the flange and the reference to confirm the flange angle; if the flange is in a horizontal state, use a ruler to measure the distance between the reference and the screw holes on the flange to confirm. The flange angle accuracy is ≤1mm.

[0045] For example, when the sections are in the normal placement state, the docking forms of the closing tubes are divided into three types: bow and stern docking, upper and lower docking, and left and right docking. Bow and stern docking means that the direction of the two closing tubes on the two sections when docking is set along the length of the ship, and left and right docking means that the direction of the two closing tubes on the two sections when docking is set along the width of the ship.

[0046] like Figure 5As shown, when the upper and lower parts are butted, the flange is placed horizontally. The accuracy of the flange in the bow and stern direction is confirmed by measuring the distance between the bow and stern direction reference and the cross dividing center line. The accuracy of the flange in the half-width direction is confirmed by measuring the distance between the half-width direction reference and the cross dividing center line. By measuring the above two distances, the accuracy of the flange in the horizontal direction can be controlled. The accuracy of the flange in the height direction is confirmed by measuring the distance between the deck below the flange and the four dividing center points on the flange. In addition, the height of the four dividing center points can be used to confirm whether the flatness of the flange meets the requirements. If the pre-installed pipe is butt-jointed up and down, and the flange is tilted, at this time, the accuracy of the flange in the height direction is confirmed by measuring the distance between the deck below the flange and the two dividing center points on the flange.

[0047] When the fore and aft docking and the left and right docking are performed, the flange is placed vertically, and the angle accuracy of the flange is confirmed by measuring the distance between the screw hole on the flange and the deck below the flange. The accuracy of the flange in the fore and aft direction is confirmed by measuring the distance between the fore and aft direction reference and the cross dividing center line, and the accuracy of the flange in the half-width direction is confirmed by measuring the distance between the half-width direction reference and the cross dividing center line. By measuring the above two distances, the accuracy of the flange in the horizontal direction can be controlled. The accuracy of the flange in the height direction is confirmed by measuring the distance between the deck below the flange and the cross dividing center line on the flange.

[0048] When the sections are placed in the reversed state, the docking forms of the closed pipes are divided into two forms: bow and stern docking / left and right docking and upper and lower docking. When the bow and stern are docked / left and right docking, the accuracy of the flange in the bow and stern direction is confirmed by measuring the distance between the bow and stern direction reference and the cross dividing centerline, the accuracy of the flange in the half-width direction is confirmed by measuring the distance between the half-width direction reference and the cross dividing centerline, and the angle accuracy of the flange is confirmed by pulling the wire. When the sections are placed in the reversed state, in order to facilitate the measurement of the distance between the flange and the bow and stern direction reference / half-width direction reference, the dividing centerline on the flange is usually reversed to the hull structure such as the bulkhead, column or T row, and then the ruler is pulled to measure.

[0049] like Figure 6 As shown in the figure, when the upper and lower parts are butt-jointed, the angle accuracy of the flange is confirmed by measuring the distance between the screw hole on the flange and the reference objects such as the weld on the segment. The accuracy control of the closed pipe in the bow and stern direction, half-width direction and height direction is the same as the above method.

[0050] 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 segmented pre-installation accuracy management method based on pipe outfitting accuracy control, characterized in that: The method comprises: Adjust the design theory benchmark to the engineering benchmark to unify the outfitting benchmark; Determine the accuracy priority of pipe and outfitting and adjust the tolerance of pipe and outfitting; The order of pipe installation should be clarified, and the pipes should be installed from the outside to the inside of the section based on the closed pipes; The installation accuracy of the closing pipe is measured based on the engineering benchmark to control the accuracy of the position of the closing pipe.

2. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 1 is characterized by: The engineering benchmark is determined based on the placement status of the segments, and the placement status of the segments is divided into normal placement and reverse placement.

3. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 2 is characterized by: The design theoretical datum includes a theoretical center line, a theoretical baseline and a theoretical rib position line No. 0, and the engineering datum includes a bow and stern direction datum, a half-width direction datum and a height direction datum.

4. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 3 is characterized by: The placement state of the segment is normal placement, and the fore and stern direction reference is based on the transverse large bulkhead. If there is no transverse large bulkhead in the segment, the strong structure in the segment is used as the reference; The half-width direction reference is based on the centerline of the block. If the block is an asymmetric structure, the main longitudinal bulkhead within the block is used as the reference; The height direction reference is based on the deck surface where the pipes and outfitting are located.

5. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 3 is characterized by: The placement state of the sections is reverse placement, with the bow and stern directions being based on the transverse large bulkhead, the half-width direction being based on the T row, and the height direction being based on the deck surface where the pipe outfitting is located.

6. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 1 is characterized by: The steps of determining the accuracy priority of pipe outfitting and adjusting the tolerance of pipe outfitting are: comparing the tolerance of the pipe and the tolerance of the hull to determine which one has a higher accuracy requirement as the main one, and adjusting the accuracy of the other one according to the higher accuracy one.

7. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 1 is characterized by: The flange on the closed pipe is used as the measuring object for measuring the installation accuracy of the closed pipe.

8. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 7 is characterized by: Four midpoints are marked in the upper, lower, left and right directions of the flange, and the two midpoints in the upper and lower directions and the two midpoints in the left and right directions of the flange are connected to form two intersecting midline lines. The two midpoints are used as reference lines for measuring installation accuracy.

9. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 1 is characterized by: The precision control includes horizontal precision control, vertical precision control and key precision dimensions, and the key precision dimensions include the angular precision and flatness of the flange.

10. The segmented pre-installation accuracy management method based on pipe outfitting accuracy control according to claim 9 is characterized in that: The angle accuracy of the flange is ≤1mm.

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