CN113280796A

CN113280796A - Method for surveying inclined plane corrugated axis of MARK III type cargo tank

Info

Publication number: CN113280796A
Application number: CN202110570970.5A
Authority: CN
Inventors: 潘冲; 刘保华; 姜旭枫; 梁崇轩; 曹杰; 裴轶铭; 吕紫维
Original assignee: Jiangnan Shipyard Group Co Ltd
Current assignee: Jiangnan Shipyard Group Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-08-20
Anticipated expiration: 2041-05-25
Also published as: CN113280796B

Abstract

The invention provides a method for surveying an inclined plane corrugated axis of a MARK III type cargo tank, which comprises the following steps: drawing reference lines BR1 on the surfaces B, D, F and J, drawing reference lines BR2 of the surfaces A, B, C and D, fitting each reference line BR1 to obtain a horizontal ring line, and fitting each reference line BR2 to obtain a longitudinal ring line; finding out RC4 points and RC5 points on the surface B and the surface D, then drawing a surface B ripple connecting line and a surface D ripple connecting line, and finally drawing ripple axes of each inclined plane according to the drawn surface B ripple connecting line and the corresponding surface D ripple connecting line; the method abandons the method of directly determining the corrugated axes on the inclined planes according to the sizes of the inclined planes, and indirectly obtains the corrugated axes on the inclined planes through the RC4 points and the RC5 points on the B surface and the D surface, improves the scribing precision of the corrugated axes, avoids the problem that the manufacturing quality of the liquid cargo tank is influenced because the precision of the corrugated axes on the inclined planes is insufficient due to the size deviation of the liquid cargo tank, and improves the manufacturing quality and the manufacturing efficiency of the liquid cargo tank.

Description

Method for surveying inclined plane corrugated axis of MARK III type cargo tank

Technical Field

The invention belongs to the technical field of liquid cargo tank construction, and particularly relates to a method for surveying an inclined plane corrugated axis of a MARK III type liquid cargo tank.

Background

The ultra-large container ship is one of domestic main ship-driving types, and the ultra-large container ship provided with the dual-fuel system is a new trend in the world shipping field, can effectively reduce the carbon emission and plays an effective protection role on the global environment. The MARK III type fuel cabin containment system is widely applied to dual-fuel ship types due to high strength and high insulation.

The MARK III type fuel cabin enclosing system is a novel liquid cargo enclosing system developed by France GTT company, and a cargo cabin film is formed by welding stainless steel corrugated plates.

As shown in fig. 1, the cargo tank has ten deck surfaces, which are an a surface (i.e., an upper deck surface), a B surface (i.e., a rear deck surface), a C surface (i.e., a lower deck surface), a D surface (i.e., a front deck surface), an E surface (i.e., an upper left deck surface), an F surface (i.e., a middle left deck surface), a G surface (i.e., a lower left deck surface), an H surface (i.e., an upper right deck surface), a J surface (i.e., a middle right deck surface), and a K surface (i.e., a lower right deck surface), wherein the a surface and the C surface are; the surface B, the surface D, the surface F and the surface J are vertical surfaces; the surface E and the surface H are upper inclined surfaces; g face and K face are the inclined plane down, before installing the stainless steel buckled plate on each deck, need first on each deck the ripple axis of marking off to ensure that the ripple of the stainless steel buckled plate of every deck can the one-to-one, make the wave form of stainless steel buckled plate in each deck juncture can be continuous. However, due to the fact that the theoretical size and the actual size of the liquid cargo tank are deviated, if the deviation of the inclined plane ripple axis is caused by directly using the midline of the inclined plane as a reference, the ripples of the stainless steel corrugated plate which is subsequently installed cannot be continuous at the junction of the cabin surface, and the construction of the whole MARK III type fuel cabin containment system is influenced.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a marking method for the inclined plane corrugated axis of a MARK iii type cargo tank, so as to accurately MARK the corrugated axis on the inclined plane, improve the marking precision of the corrugated axis, and avoid the influence on the installation quality and the installation efficiency of a stainless steel corrugated plate due to the deviation of the corrugated axis on the inclined plane caused by the deviation between the actual size and the theoretical size of the cargo tank.

To achieve the above and other related objects, the present invention provides a method for surveying a bevel corrugated axis of a cargo tank of MARK iii type, the method comprising:

drawing reference lines BR1 on the surfaces B, D, F and J, drawing reference lines BR2 of the surfaces A, B, C and D, fitting each reference line BR1 to obtain a horizontal ring line, and fitting each reference line BR2 to obtain a longitudinal ring line;

finding out RC4 points and RC5 points on the B surface and the D surface, then drawing a B surface ripple connecting line and a D surface ripple connecting line, and finally drawing the ripple axis of each inclined plane according to the drawn B surface ripple connecting line and the corresponding D surface ripple connecting line.

The invention abandons the method of determining the ripple axis on the inclined plane directly according to the size of each inclined plane, and adopts a new method of indirectly obtaining the ripple axis on the inclined plane through the RC4 point and the RC5 point on the B surface and the D surface, thereby improving the scribing precision of the ripple axis, effectively avoiding the problem that the manufacturing quality of the liquid cargo tank is influenced because the precision of the prospecting ripple axis on the inclined plane is not enough due to the size deviation of the liquid cargo tank, and improving the manufacturing quality and the manufacturing efficiency of the liquid cargo tank.

Preferably, the method for finding the point RC4 and the point RC5 on the B surface and the D surface comprises the following steps: erecting laser trackers on the surface B and the surface D respectively, placing a target ball on a high-precision dotting device, enabling the target ball to move on the surface B and the surface D along with the high-precision dotting device until the position of the target ball detected by the laser trackers is consistent with theoretical coordinate positions of a point RC4 and a point RC5 provided by a design drawing, starting the high-precision dotting device, marking two points RC4 and two points RC5 on the surface B and the surface D respectively, and improving the marking accuracy of the points RC4 and RC 5.

Preferably, the method for obtaining the upper bevel corrugation axis comprises the following steps: connecting two RC5 points on the B surface to obtain a first B surface ripple axis, drawing an auxiliary line which is perpendicular to the first B surface ripple axis and passes through RC5 points on the B surface, making a first auxiliary point which is S away from the first B surface ripple axis on the auxiliary line, making a second auxiliary point which is S away from the auxiliary line on the first B surface ripple axis, drawing an arc by taking the first auxiliary point and the second auxiliary point as the circle center and the distance S as the radius to enable the arc lines to intersect to obtain an intersection point I and an intersection point II, connecting the intersection point I and the intersection point II, and drawing a first B surface ripple connecting line; and marking a first D-surface ripple connecting line on the D surface by adopting the same method, respectively prolonging the first B-surface ripple connecting line and the first D-surface ripple connecting line to enable the first B-surface ripple connecting line and the first D-surface ripple connecting line to be respectively intersected with the upper inclined surface to obtain a reference point I and a reference point II, and connecting the reference point I and the reference point II which are positioned on the same upper inclined surface to obtain a ripple axis of the upper inclined surface.

Preferably, the method for acquiring the lower inclined surface ripple axis comprises the following steps: connecting two RC4 points on the B surface to obtain a second B surface ripple axis, drawing an auxiliary line which is perpendicular to the second B surface ripple axis and passes through RC4 points on the B surface, making a first auxiliary point which is S away from the second B surface ripple axis on the auxiliary line, making a second auxiliary point which is S away from the auxiliary line on the second B surface ripple axis, drawing an arc by taking the first auxiliary point and the second auxiliary point as the circle center and the distance S as the radius respectively to intersect the arc lines to obtain an intersection point I and an intersection point II, connecting the intersection point I and the intersection point II, and drawing a second B surface ripple connecting line; and marking a second D-surface ripple connecting line on the D surface by adopting the same method, respectively prolonging the second B-surface ripple connecting line and the second D-surface ripple connecting line to enable the second B-surface ripple connecting line and the second D-surface ripple connecting line to be respectively intersected with the lower inclined surface to obtain a reference point I and a reference point II, and connecting the reference point I and the reference point II which are positioned on the same lower inclined surface to obtain a ripple axis of the lower inclined surface.

Preferably, the laser scanner is used to match the ink fountain line to complete the connection of the two known points.

Preferably, the step of connecting the two known points comprises: the two laser receivers are respectively placed on two points, the laser emission angle of the laser swinger is adjusted to obtain a laser line connecting the two points, marking points are made at intervals of 3m along the length direction of the laser line, the marking points are connected by using an ink fountain line to obtain a connection line of the two points, so that the connection line precision is improved, and the problem that the connection line is deviated due to too far distance between the two points, and the scribing precision of a corrugated axis is further influenced is avoided.

Preferably, BR1 and BR2 are determined by offset values from the actual midpoint positions of the edges, ensuring the scribing accuracy of BR1 and BR 2.

As above, the invention relates to a method for surveying the inclined plane corrugated axis of a MARK III type cargo tank. Has the following beneficial effects:

the method abandons the method of directly determining the corrugated axes on the inclined planes according to the sizes of the inclined planes, adopts a new method of indirectly obtaining the corrugated axes on the inclined planes through RC4 points and RC5 points on the B surface and the D surface, improves the scribing precision of the corrugated axes, and effectively avoids the problem that the precision of the corrugated axes on the inclined planes is insufficient due to the size deviation of the liquid cargo tank, thereby influencing the installation quality and the installation efficiency of the stainless steel corrugated plates.

Drawings

Fig. 1 is a schematic view of all deck surfaces of a cargo tank.

FIG. 2 is a schematic diagram of points RC4 and RC5 marked on the B surface and the D surface,

FIG. 3 is a schematic view of a first B-plane corrugation axis and a second B-plane corrugation axis on the B-plane.

FIG. 4 is a schematic view of a first D-surface corrugation axis and a second D-surface corrugation axis on a D-surface.

FIG. 5 is a schematic diagram of the determination of reference point I on plane E by the point RC5 on the left side of plane B.

FIG. 6 is a schematic diagram of reference point II determined on plane E by point RC5 on the left side of plane D.

FIG. 7 is a schematic diagram of the determination of reference point I on plane H by the right RC5 point on plane B.

FIG. 8 is a schematic diagram of reference point II determined on plane H by the right RC5 point on plane D.

FIG. 9 is a schematic diagram of the determination of reference point I on plane G by the point RC4 on the left side of plane B.

FIG. 10 is a schematic diagram of reference point II determined on plane G by point RC4 on the left side of plane D.

FIG. 11 is a schematic diagram of the determination of reference point I on the K plane by the right RC4 point on the B plane.

FIG. 12 is a schematic diagram of reference point II determined on the K plane by the right RC4 point on the D plane.

Description of the reference numerals

Horizontal circular line 1, longitudinal circular line 2, first B-surface ripple axis B1, first B-surface ripple connecting line B11, second B-surface ripple axis B2, second B-surface ripple connecting line B12, first D-surface ripple axis D1, first D-surface ripple connecting line D11, second D-surface ripple axis D2, second D-surface ripple connecting line D12, auxiliary line 3, first auxiliary point Z1 and second auxiliary point Z2.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1 to 12. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1, the cargo tank has ten deck surfaces, which are an a surface (i.e., an upper deck surface), a B surface (i.e., a rear deck surface), a C surface (i.e., a lower deck surface), a D surface (i.e., a front deck surface), an E surface (i.e., an upper left deck surface), an F surface (i.e., a middle left deck surface), a G surface (i.e., a lower left deck surface), an H surface (i.e., an upper right deck surface), a J surface (i.e., a middle right deck surface), and a K surface (i.e., a lower right deck surface), wherein the a surface and the C surface are horizontal planes; the surface B, the surface D, the surface F and the surface J are vertical surfaces; the surface E and the surface H are upper inclined surfaces, and the upper inclined surfaces and the lower inclined surfaces are inclined surfaces needing to be scratched with corrugated axes.

As shown in fig. 1 to 12, the present invention provides a method for surveying a bevel corrugated axis of a MARK iii cargo tank, the method comprising:

drawing reference lines BR1 on the surfaces B, D, F and J, drawing reference lines BR2 of the surfaces A, B, C and D, fitting the reference lines BR1 to obtain a horizontal ring line 1, and fitting the reference lines BR2 to obtain a longitudinal ring line 2;

The survey of reference lines BR1, BR2 comprises the following steps:

measuring the lengths of side lines of all deck surfaces of the liquid cargo tank and measuring the length of a diagonal line of each deck surface;

when the length of the side line is measured, the laser tracker is used for finding out the midpoint position of each horizontal side and each vertical side on the surface A and the surface B, and marking the actual midpoint position on the corresponding side line;

inputting the measured data into GTT software to obtain the actual shape of the liquid cargo tank, coupling the actual shape of the liquid cargo tank with the theoretical shape, and calculating the position of the actual datum line of the liquid cargo tank (namely the distance of the endpoint of the datum line deviating from the actual midpoint of the corresponding edge);

determining two end points of BR1 or BR2 according to the distance of each reference line deviating from the actual midpoint of the corresponding edge on a cabin surface needing to draw the reference line, respectively placing a laser receiver on each end point, adjusting the laser emission direction of a laser swinger until the two laser receivers can receive laser emitted by the laser swinger, thereby forming a laser line between the two end points, marking points every 3m along the length direction of the laser line, and then connecting the marking points by adopting an ink fountain line to obtain a BR1 line or a BR2 line.

It is understood that the surveying methods of the reference lines BR1 and BR2 are common knowledge of those skilled in the art, and therefore, the detailed description thereof is omitted.

The step of finding the positions of the RC4 point and the RC5 point on the B surface and the D surface comprises the following steps:

and erecting laser trackers on the surface B and the surface D respectively, and establishing a space coordinate system. The laser tracker erected on the B surface uses a BR1 line of the B surface as an X axis, a BR2 line of the B surface as a Z axis, an intersection point of a BR1 line of the B surface and a BR2 line of the B surface as a coordinate origin, a space coordinate system is established (the Y axis can be determined by the X axis and the Z axis), theoretical coordinate values of an RC5 point and an RC4 point provided by a design drawing are respectively input into POLY WORKS software equipped with the laser tracker, then a target ball is placed on a high-precision dotter, the target ball is made to move on the B surface along with the high-precision dotter, laser emitted by the laser tracker automatically tracks the target ball until the laser tracker detects that the target ball reaches the theoretical coordinate position of an RC5/RC4 point, the high-precision dotter is triggered, and a foreign impact point is knocked on the B surface, so that the positions of RC4 and RC5 on the B surface are determined; similarly, the laser tracker erected on the D surface uses the BR1 line of the D surface as an X axis, the BR2 line of the D surface as a Z axis, the intersection point of the BR1 line of the D surface and the BR2 line of the D surface as a coordinate origin, a space coordinate system is established (the Y axis can be determined by the X axis and the Z axis), theoretical coordinate values of an RC5 point and an RC4 point provided by a design drawing are respectively input into POLY WORKS software equipped with the laser tracker, then a target ball is placed on the high-precision dotter and is made to move together with the high-precision dotter on the D surface until the laser tracker detects that the target ball reaches the theoretical coordinate position of an RC5/RC4 point, the high-precision dotter is triggered, and a foreign impact point is knocked on the D surface, so that the positions of the RC4 and the RC5 on the D surface are determined.

Wherein, the surface B and the surface D respectively have two RC5 points (namely a left RC5 point and a right RC5 point), two RC4 points (namely a left RC4 point and a right RC4 point); as shown in FIG. 2, the coordinate values of the RC5 point are (+ -L TOP, 0, Z TOP) and the RC4 point are (+ -L BOTTOM, 0, -Z TOP).

The survey of the upper bevel wave axis includes a survey of the E-plane wave axis and a survey of the H-plane wave axis.

As shown in fig. 4 to 6, the method for surveying the axes of the corrugations on the E-plane comprises the following steps:

two RC5 points on the surface B are connected to obtain a first B-surface corrugated axis B1, then a 90-degree right-angle tool is utilized, an auxiliary line 3 perpendicular to the first B-surface corrugation axis B1 and passing through the point RC5 on the left side of the B-surface is drawn in the B-surface, a first auxiliary point Z1 is then made on the auxiliary line 3 at a distance S from the first B-surface corrugation axis B1, making a second auxiliary point Z2 which is away from the auxiliary line 3 and is S on a first B-surface corrugated axis B1, respectively taking the first auxiliary point Z1 and the second auxiliary point Z2 as circle centers, taking the distance S as a radius, drawing an arc by using a sharp foot vernier caliper, intersecting the arcs to obtain 4 intersection points, marking an intersection point which is closest to the E surface as an intersection point I, marking an intersection point which is farthest from the E surface as an intersection point II, connecting the intersection point I with the intersection point II, drawing a first B-surface corrugated connecting line B11, prolonging a first B-surface corrugated connecting line B11, intersecting the first B-surface corrugated connecting line with the E surface, and obtaining a reference point I positioned on the E surface;

similarly, two RC5 points on the D surface are connected to obtain a first D surface corrugation axis D1, then a 90-degree right-angle tool is utilized, an auxiliary line 3 perpendicular to the first D-surface corrugation axis B1 and passing through the point RC5 on the left side of the D-surface is drawn in the D-surface, a first auxiliary point Z1 is then made on the auxiliary line 3 at a distance S from the first D-surface corrugation axis D1, drawing a second auxiliary point Z2 which is away from the auxiliary line 3 and is S on the first D-surface corrugated axis D1, respectively taking the first auxiliary point Z1 and the second auxiliary point Z2 as circle centers, taking the distance S as a radius, drawing an arc by using a sharp foot vernier caliper, enabling the arcs to intersect to obtain 4 intersection points, marking the intersection point which is closest to the E surface as an intersection point I, marking the intersection point which is farthest from the E surface as an intersection point II, drawing a first D-surface corrugated connecting line D11, prolonging the first D-surface corrugated connecting line D11, enabling the first D-surface corrugated connecting line D11 to intersect with the E surface, and obtaining a reference point II which is positioned on the E surface;

respectively placing a laser receiver on the reference point I and the reference point II on the E surface, adjusting the laser emission direction of the laser swinger until the two laser receivers can receive laser emitted by the laser swinger, forming a laser line between the reference point I and the reference point II, marking points at intervals of 3m along the length direction of the laser line, and then connecting the marking points by adopting ink fountain lines to obtain the corrugated axis of the E surface.

As shown in fig. 4, 7 and 8, the method for surveying the axes of corrugations on the H-plane comprises the following steps:

two RC5 points on the surface B are connected to obtain a first B-surface corrugated axis B1, then a 90-degree right-angle tool is utilized, an auxiliary line 3 perpendicular to the first B-surface corrugation axis B1 and passing through the point RC5 on the right side of the B-surface is drawn in the B-surface, a first auxiliary point Z1 is then made on the auxiliary line 3 at a distance S from the first B-surface corrugation axis B1, making a second auxiliary point Z2 which is away from the auxiliary line 3 and is S on a first B-surface corrugated axis B1, respectively taking the first auxiliary point Z1 and the second auxiliary point Z2 as circle centers, taking the distance S as a radius, drawing an arc by using a sharp foot vernier caliper, intersecting the arcs to obtain 4 intersection points, marking an intersection point which is closest to the H surface as an intersection point I, marking an intersection point which is farthest from the H surface as an intersection point II, connecting the intersection point I with the intersection point II, drawing a first B-surface corrugated connecting line B11, prolonging a first B-surface corrugated connecting line B11, intersecting the first B-surface corrugated connecting line with the H surface, and obtaining a reference point I positioned on the H surface;

similarly, two RC5 points on the D surface are connected to obtain a first D surface corrugation axis D1, then a 90-degree right-angle tool is utilized, an auxiliary line 3 perpendicular to the first D-surface corrugation axis B1 and passing through the point RC5 on the right side of the D-surface is drawn in the D-surface, a first auxiliary point Z1 is then made on the auxiliary line 3 at a distance S from the first D-surface corrugation axis D1, making a second auxiliary point Z2 which is away from the auxiliary line 3 and is S on the first D-surface corrugated axis D1, respectively taking the first auxiliary point Z1 and the second auxiliary point Z2 as circle centers, taking the distance S as a radius, drawing an arc by using a sharp foot vernier caliper, enabling the arcs to intersect to obtain 4 intersection points, marking the intersection point which is closest to the H surface as an intersection point I, marking the intersection point which is farthest from the H surface as an intersection point II, drawing a first D-surface corrugated connecting line D11, prolonging the first D-surface corrugated connecting line D11, enabling the first D-surface corrugated connecting line D11 to intersect with the H surface, and obtaining a reference point II which is positioned on the H surface;

respectively placing a laser receiver on a reference point I and a reference point II on the H surface, adjusting the laser emission direction of the laser swinger until the two laser receivers can receive laser emitted by the laser swinger, forming a laser line between the reference point I and the reference point II, marking points at intervals of 3m along the length direction of the laser line, and then connecting the marking points by adopting ink fountain lines to obtain the corrugated axis of the H surface.

The survey of the lower bevel ripple axis includes a survey of the G-plane ripple axis and a survey of the K-plane ripple axis.

As shown in fig. 4, 9 and 10, the method for surveying the axes of the corrugations on the G-plane comprises the following steps:

two RC4 points on the surface B are connected to obtain a second B-surface corrugated axis B2, then a 90-degree right-angle tool is utilized, an auxiliary line 3 perpendicular to the second B-surface corrugation axis B2 and passing through the point RC4 on the left side of the B-surface is drawn in the B-surface, then a first auxiliary point Z1 is made on the auxiliary line 3 at a distance S from the second B-surface corrugation axis B2, drawing a second auxiliary point Z2 which is away from the auxiliary line 3 and is S on a second B-surface corrugated axis B2, respectively taking the first auxiliary point Z1 and the second auxiliary point Z2 as circle centers and the distance S as a radius, drawing an arc by using a sharp foot vernier caliper, intersecting the arcs to obtain 4 intersection points, marking an intersection point which is closest to the G surface as an intersection point I, marking an intersection point which is farthest from the G surface as an intersection point II, connecting the intersection point I with the intersection point II, drawing a second B-surface corrugated connecting line B12, prolonging a second B-surface corrugated connecting line B12, intersecting the second B-surface corrugated connecting line with the G surface, and obtaining a reference point I positioned on the G surface;

similarly, two RC4 points on the D surface are connected to obtain a second D surface corrugation axis D2, then a 90-degree right-angle tool is utilized, an auxiliary line 3 perpendicular to the second D-surface corrugation axis D2 and passing through the point RC4 on the left side of the D-surface is drawn in the D-surface, a first auxiliary point Z1 is then made on the auxiliary line 3 at a distance S from the second D-surface corrugation axis D2, drawing a second auxiliary point Z2 which is S away from the auxiliary line 3 on a second D-surface corrugated axis D2, respectively taking the first auxiliary point Z1 and the second auxiliary point Z2 as circle centers, taking the distance S as a radius, drawing an arc by using a sharp foot vernier caliper, intersecting the arcs to obtain 4 intersection points, marking the intersection point closest to the G surface as an intersection point I, marking the intersection point farthest from the G surface as an intersection point II, drawing a second D-surface corrugated connecting line D12, prolonging the second D-surface corrugated connecting line D12, intersecting the intersection point with the G surface to obtain a reference point II on the G surface;

respectively placing a laser receiver on the reference point I and the reference point II on the G surface, adjusting the laser emission direction of the laser swinger until the two laser receivers can receive laser emitted by the laser swinger, forming a laser line between the reference point I and the reference point II, marking points at intervals of 3m along the length direction of the laser line, and then connecting the marking points by adopting ink fountain lines to obtain the corrugated axis of the G surface.

As shown in fig. 4, 11 and 12, the method for surveying the axes of the corrugations on the K-plane comprises the following steps:

two RC4 points on the surface B are connected to obtain a second B-surface corrugated axis B2, then a 90-degree right-angle tool is utilized, an auxiliary line 3 perpendicular to the second B-surface corrugation axis B2 and passing through the point RC4 on the right side of the B-surface is drawn in the B-surface, then a first auxiliary point Z1 is made on the auxiliary line 3 at a distance S from the second B-surface corrugation axis B2, making a second auxiliary point Z2 which is away from the auxiliary line 3 and is S on a second B-surface corrugated axis B2, respectively taking the first auxiliary point Z1 and the second auxiliary point Z2 as circle centers and the distance S as a radius, drawing an arc by using a sharp foot vernier caliper, intersecting the arcs to obtain 4 intersection points, marking the intersection point which is closest to the K surface as an intersection point I, marking the intersection point which is farthest from the K surface as an intersection point II, connecting the intersection point I with the intersection point II, drawing a second B-surface corrugated connecting line B12, prolonging a second B-surface corrugated connecting line B12, intersecting the second B-surface corrugated connecting line with the K surface, and obtaining a reference point I positioned on the K surface;

similarly, two RC4 points on the D surface are connected to obtain a second D surface corrugation axis D2, then a 90-degree right-angle tool is utilized, an auxiliary line 3 perpendicular to the second D-surface corrugation axis D2 and passing through the point RC4 on the right side of the D-surface is drawn in the D-surface, a first auxiliary point Z1 is then made on the auxiliary line 3 at a distance S from the second D-surface corrugation axis D2, drawing a second auxiliary point Z2 which is away from the auxiliary line 3 and is S on a second D-surface corrugated axis D2, respectively taking the first auxiliary point Z1 and the second auxiliary point Z2 as circle centers and the distance S as a radius, drawing an arc by using a sharp foot vernier caliper, intersecting the arcs to obtain 4 intersection points, marking the intersection point which is closest to the K surface as an intersection point I, marking the intersection point which is farthest away from the K surface as an intersection point II, drawing a second D-surface corrugated connecting line D12, prolonging the second D-surface corrugated connecting line D12, intersecting the second D-surface corrugated connecting line D12 with the K surface, and obtaining a reference point II on the K surface;

respectively placing a laser receiver on a reference point I and a reference point II on a K surface, adjusting the laser emission direction of a laser swinger until the two laser receivers can receive laser emitted by the laser swinger, forming a laser line between the reference point I and the reference point II, marking points at intervals of 3m along the length direction of the laser line, and then connecting the marking points by adopting ink fountain lines to obtain the corrugated axis of the K surface.

Therefore, the marking of the axes of the waves on the 4 inclined planes E/H/G/K is completed, and the marking precision of the axes of the waves on the inclined planes is improved.

It can be understood that when the first auxiliary point Z1 and the second auxiliary point Z2 are determined, the set distance S is not greater than the vertical distance from the RC4 or RC5 point to the corresponding inclined plane, and in consideration of both convenience and accuracy of field operation, the embodiment preferably sets S to 300 mm.

In conclusion, the invention indirectly obtains the corrugated axis on the inclined plane through the RC4 point and the RC5 point on the B surface and the D surface, improves the scribing precision of the corrugated axis, and effectively avoids the problem that the precision of the corrugated axis scribed on the inclined plane is insufficient due to the size deviation of the cargo tank, thereby influencing the installation quality and the installation efficiency of the stainless steel corrugated plate.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A method for surveying the inclined plane ripple axis of a MARK III type cargo tank is characterized by comprising the following steps:

drawing reference lines BR1 on the surfaces B, D, F and J, drawing reference lines BR2 of the surfaces A, B, C and D, fitting the reference lines BR1 to obtain a horizontal ring line (1), and fitting the reference lines BR2 to obtain a longitudinal ring line (2);

2. The method of claim 1, wherein finding RC4 and RC5 points on the B-plane and the D-plane comprises: erecting laser trackers on the surface B and the surface D respectively, placing a target ball on a high-precision dotting device, enabling the target ball to move on the surface B and the surface D along with the high-precision dotting device until the position of the target ball detected by the laser trackers is consistent with theoretical coordinate positions of a point RC4 and a point RC5 provided by a design drawing, starting the high-precision dotting device, and marking two points RC4 and two points RC5 on the surface B and the surface D respectively.

3. The method of claim 2, wherein the method of obtaining the upper bevel corrugation axis comprises: connecting two RC5 points on a B surface to obtain a first B surface ripple axis (B11), drawing an auxiliary line (3) which is perpendicular to the first B surface ripple axis (B1) and passes through RC5 points on the B surface, making a first auxiliary point (Z1) which is S away from the first B surface ripple axis (B1) on the auxiliary line (3), making a second auxiliary point (Z2) which is S away from the auxiliary line (3) on the first B surface ripple axis (B1), respectively taking the first auxiliary point (Z1) and the second auxiliary point (Z2) as the circle centers, drawing an arc with the distance S as a radius to intersect the arc lines, obtaining an intersection point I and an intersection point II, connecting the intersection point I and the intersection point II, and drawing a first B surface ripple connecting line (B11); and scribing a first D-surface corrugated connecting line (D11) on the D surface by the same method, respectively extending the first B-surface corrugated connecting line (B11) and the first D-surface corrugated connecting line (D11) to respectively intersect with the upper inclined surface to obtain a reference point I and a reference point II, and connecting the reference point I and the reference point II which are positioned on the same upper inclined surface to obtain a corrugated axis of the upper inclined surface.

4. The method of claim 3, wherein the method of obtaining the lower slope corrugated axis comprises: connecting two RC4 points on a B surface to obtain a second B surface ripple axis (B2), drawing an auxiliary line (3) which is perpendicular to the second B surface ripple axis (B2) and passes through RC4 points on the B surface, making a first auxiliary point (Z1) which is S away from the second B surface ripple axis (B2) on the auxiliary line (3), making a second auxiliary point (Z2) which is S away from the auxiliary line (3) on the second B surface ripple axis (B2), respectively taking the first auxiliary point (Z1) and the second auxiliary point (Z2) as the circle centers, drawing an arc with the distance S as a radius to intersect the arc lines, obtaining an intersection point I and an intersection point II, connecting the intersection point I and the intersection point II, and drawing a second B surface ripple connecting line (B12); and scribing a second D-surface corrugated connecting line (D12) on the D surface by the same method, respectively extending the second B-surface corrugated connecting line (B12) and the second D-surface corrugated connecting line (D12) to enable the second B-surface corrugated connecting line and the second D-surface corrugated connecting line to be respectively intersected with the lower inclined surface to obtain a reference point I and a reference point II, and connecting the reference point I and the reference point II which are positioned on the same lower inclined surface to obtain a corrugated axis of the lower inclined surface.

5. A method as claimed in claim 3 or 4, wherein the line connecting the two known points is made by a laser scanner in conjunction with a duct line.

6. The method of claim 5, wherein the step of connecting the two known points comprises: the two laser receivers are respectively placed on two points, the laser emission angle of the laser swinger is adjusted to obtain a laser line connecting the two points, marking points are made every 3m along the length direction of the laser line, and the marking points are connected by using an ink fountain line to obtain a connecting line of the two points.

7. The method of claim 1, wherein BR1 and BR2 are defined by offset values from the actual midpoint positions of the edges.