CN103353279B - A kind of LNG ship cargo tank insulated case and the pinpoint method of flange bolt - Google Patents
A kind of LNG ship cargo tank insulated case and the pinpoint method of flange bolt Download PDFInfo
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- CN103353279B CN103353279B CN201310265265.XA CN201310265265A CN103353279B CN 103353279 B CN103353279 B CN 103353279B CN 201310265265 A CN201310265265 A CN 201310265265A CN 103353279 B CN103353279 B CN 103353279B
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Abstract
The present invention relates to a kind of liquefied natural gas (LNG) carrier (hereinafter referred to as LNG ship) cargo tank insulated case and the pinpoint method of flange bolt, the method mainly comprises the steps: to delimit reference mark, fit Plane → set up rectangular coordinate system → checks rectangular coordinate system → and according to the accurate locating flange bolt of rectangular coordinate → the mensurations flange bolt Z axis coordinate figure of design → according to the Z axis coordinate figure selection insulated case special washer of measurement.The present invention uses laser tracking measurement system and supporting Special frock device to solve the accurate orientation problem of LNG ship cargo tank flange bolt, ensure that the flatness requirement that insulated case is installed, measuring process is simple simultaneously, while reducing labour intensity, improves efficiency greatly.
Description
Technical field
The present invention relates to the construction of Large LNG ship, specifically a kind of LNG ship cargo tank insulated case and the pinpoint method of flange bolt.
Background technology
LNG ship is described as world's ship for civil use and " imperial crown obtains jewel ", and its liquid goods maintenance system, liquid cargo barge fortune system and special power propulsion system constitute three large features of LNG ship.Wherein, liquid goods maintenance system is the most special region of whole LNG ship, is also the maximum part of designed and calculated difficulty.
The first batch of volume of compartment that my department undertakes the construction of completion is the LNG ship of 14.72 ten thousand steres, employing be that French GAZTRANSPORT & TECHNIGAZS.A.S(is hereinafter referred to as GTT) company film-type NO.96 type patented technology.The liquid goods maintenance system of NO.96 membrane LNG tanker, primarily of two-layer insulated case and two-layer invar steel composition, absorbs heat with isolated LNG from cargo hold, is delivered on bulkhead simultaneously by the pressure of liquid, guarantee that liquefied natural gas (LNG) can not be revealed.Therefore, LNG ship to the dimensional accuracy of cargo tank Ship Structure and flatness requirement high especially.According to GTT design, at the intermediate demand mounting flange bolt of every layer of adjacent 4 insulated case in order to fixed insulation case.Meanwhile, in order to ensure the flatness of cargo tank hull surface, need the Gaskets placing suitable thickness according to measurement result, to reach the object of insulated case leveling.
Summary of the invention
The object of the invention is to propose a kind of LNG ship cargo tank insulated case and the pinpoint method of flange bolt, by laser tracking measurement system, complete insulated case and the pinpoint object of flange bolt.
Technical solution of the present invention is as follows:
This programme mainly comprises: delimit check point, the Gaskets of fit Plane → set up rectangular coordinate system → checks rectangular coordinate system → locating flange bolt → mensuration flange bolt substructure height value → select suitable thickness.
Described LNG ship cargo tank insulated case and the pinpoint method of flange bolt, it is characterized in that, the method has following steps:
The first step, on bulkhead selected 10 to 20 reference mark, make reference mark be evenly distributed in bulkhead;
Second step, utilize laser tracking measurement system to measure the D coordinates value at all reference mark, and by this system, all reference mark are become a plane by least square fitting;
3rd step, to be positioned at the reference mark of bulkhead center for initial point, stem direction is X-axis positive dirction, and starboard direction is Y-axis positive dirction, and in cabin, direction is Z axis positive dirction, sets up three-dimensional cartesian coordinate system;
4th step, according to bulkhead situation, choose equally distributed 10 ~ 20 the flange bolt pedestals of plane outermost as check point, in X, Y two-dimensional direct angle coordinate system determined, by laser tracking measurement system, above-mentioned check point is marked on bulkhead;
5th step, measure check point apart from the distance at bulkhead edge, contrast with design predetermined value, within the error range judging whether all to be in+20 ,-30;
If the 6th step measured value all meets accuracy requirement, then show that the rectangular coordinate system set up is set up;
If measured value does not meet accuracy requirement, then offset corresponding coordinate axle, return the 3rd step and set up new rectangular coordinate system;
7th step, the D coordinates value of flange bolt is imported to (because each point is in theory in same plane, therefore Z axis coordinate figure is 0) in laser tracking measurement system;
8th step, according to the X, the Y-coordinate value that import, determine the position of flange bolt in the rectangular coordinate system set up, and utilize laser tracking measurement system accurately to be navigated on bulkhead by flange bolt;
9th step, measure the Z axis coordinate figure of all flange bolt pedestals with laser tracking measurement system;
Tenth step, the X, Y, Z axis coordinate figure of the flange bolt pedestal measured to be imported in GTTLISS, the Z axis coordinate design load of more each flange bolt and the difference of measured value, the thickness of pad needed for calculating on each flange bolt.
Compared with prior art, technique effect of the present invention is by laser tracker and supporting Special frock device, the flange bolt of fixed L NG ship cargo tank insulated case is accurately navigated on bulkhead by GTT designing requirement, the Simultaneously test Z axis coordinate figure of flange bolt pedestal, calculate the thickness of required pad on each flange bolt, ensure that insulated case installs rear overall planarization.Measuring method of the present invention is reliably easy, while precision and efficiency get a promotion, greatly reduces labour intensity.
Accompanying drawing explanation
Fig. 1 is LNG ship typical case cargo tank cross-sectional.
Fig. 2 is LNG ship typical case cargo tank A face schematic diagram.
In figure,
1-reference mark, 2-macrolattice line
3-small grid line, 4-coordinate axis
Embodiment
As shown in Figure 1, LNG ship typical case cargo tank generally comprises ten faces, and wherein former and later two faces are octagon, and middle eight faces are quadrilateral.Below for LNG ship typical case cargo tank A face (quadrilateral surface), the pinpoint method of LNG ship cargo tank flange bolt of the present invention is described in further detail, but can not limits the scope of the invention with this.
The pinpoint method of LNG ship cargo tank flange bolt in the present invention, comprises the steps:
The first step, with laser scribing template draw on bulkhead four angles apart from bulkhead edge 100mm two lines and make intersection point, with hot melt adhesive, target stand is attached to the inner side of two lines and intersection point, the edge of target stand must paste line, and this target stand is set as reference mark A, B, C, D.Clearly make a mark " must not move " near reference mark.
Second step, draw a line apart from bulkhead edge 100mm by laser scribing template at bulkhead four edges near center location, with hot melt adhesive, target stand is attached to the inner side of line, the edge of target stand must paste line, and above-mentioned target stand is set as reference mark E, F, G, H.
3rd step, with hot melt adhesive, target stand is attached to bulkhead approximate centre position, is designated as reference mark O; With hot melt adhesive, four target stands are attached to bulkhead rest position, are designated as reference mark I, J, K, L, ensure that target stand is even respectively in bulkhead.
4th step, target ball is placed on above-mentioned 13 reference mark, uses laser tracker Survey control point A, B, C, D, E, F, G, H, I, J, K, L three-dimensional coordinate respectively, fitted to an ideal plane according to least square method.
5th step, according to measure coordinate figure, find out central point C_AD, the C_BC on AD, BC limit, determine the central point C_ABCD of C_AD and C_BC.
6th step, in the ideal plane determined, to cross central point C_AD and C_BC straight line for X-axis, with central point C_ABCD for true origin sets up three-dimensional cartesian coordinate system, X-axis positive dirction points to stem, and Y-axis positive dirction points to starboard, and Z axis positive dirction is pointed in cabin.
7th step, according to bulkhead situation, choose equally distributed 10 ~ 20 the flange bolt pedestals of plane outermost as check point, in the rectangular coordinate system plane set up, by laser tracking measurement system, above-mentioned check point is marked on bulkhead.
8th step, use the distance at laser scribing template and tape measure check point and bulkhead edge, whether detection measuring distance exceeds the error range of+20 ~-30mm; Tracer liquid vault Periapical flange bolt pedestal point coordinate, detects and whether exceedes ± the error range of 10mm with theoretical value.
If the 9th step the 8th pacing value is all within error range, then determine that the rectangular coordinate system set up meets the requirements; If measured value exceeds error range, then offset corresponding coordinate axis according to measured value, return the 6th step and set up new rectangular coordinate system.
Tenth step, find the point in X-axis and Y-axis with laser tracking measurement system, use high precision tapper to mark in relevant position, interval about 2m between the gauge point in X-axis and Y-axis.
11 step, determine the coordinate of macrolattice point according to the line figure of design, use high precision tapper to mark in relevant position with the macrolattice point of 3.6 × 3m in survey instrument determination plane.
12 step, X-axis all on bulkhead and Y-axis gauge point are coupled together formation two articles of axis with red black mark-line, and two axis are extended to bulkhead face least significant end.
13 step, linked up by macrolattice gauge point with white black mark-line, this line is macrolattice line.With tape measure inspection macrolattice linear dimension and near the macrolattice point of X-axis or Y-axis apart from the distance of X-axis or Y-axis, guarantee that the error size of each macrolattice point is within 1mm; The maximum 2mm of 10m mesh lines error in length; Draw arbitrarily macroreticular Diagonal Dimension, whether the difference comparing two Diagonal Dimension exceeds 2mm.If do not meet error requirements, then remeasure this place's macrolattice point.
14 step, draw a little by after macrolattice line trisection with scriber, obtain the small grid line of 1.2 × 1m afterwards with white ink fountain snap the line.Measuring the size of small grid line, is 1mm with the maximum error of theoretical value.Macrolattice for special size is divided into corresponding small grid according to drawing requirement.All small grid points are flange bolt base position, according to drawing, at the location number of its lower right corner mark flange bolt pedestal.
15 step, regenerate coordinate plane according to the reference mark on bulkhead, read the coordinate file of the flange bolt base position point of small grid in bulkhead, measure the Z axis coordinate figure of each connecting piece base location point with laser tracking measurement system.
16 step, the flange bolt X, Y, Z axis coordinate figure measured to be imported in GTTLISS software, calculate the thickness of pad needed for each point, guarantee that follow-up insulated case setting height(from bottom) is consistent, reach flatness requirement.
Certainly, the pinpoint construction method of LNG ship cargo tank flange bolt of the present invention is not only confined to the accurate locator meams of flange bolt in cited A face in above-described embodiment, also comprises other similar pinpoint modes.In a word, protection scope of the present invention also comprises other apparent conversion for a person skilled in the art.
Claims (1)
1. a LNG ship cargo tank insulated case and the pinpoint method of flange bolt, it is characterized in that, first reference mark, fit Plane delimited, then set up rectangular coordinate system, check rectangular coordinate system, then locating flange bolt, mensuration flange bolt substructure height value, the finally Gaskets of selected suitable thickness; The method has following steps:
The first step, on bulkhead selected 10 to 20 reference mark, make reference mark be evenly distributed in bulkhead; Second step, utilize laser tracking measurement system to measure the D coordinates value at all reference mark, and by this system, all reference mark are become a plane by least square fitting;
3rd step, to be positioned at the reference mark of bulkhead center for initial point, stem direction is X-axis positive dirction, and starboard direction is Y-axis positive dirction, and in cabin, direction is Z axis positive dirction, sets up three-dimensional cartesian coordinate system; 4th step, according to bulkhead situation, choose equally distributed 10 ~ 20 the flange bolt pedestals of plane outermost as check point, in X, Y two-dimensional direct angle coordinate system determined, by laser tracking measurement system, above-mentioned check point is marked on bulkhead;
5th step, measure check point apart from the distance at bulkhead edge, contrast with design predetermined value, within the error range judging whether all to be in+20mm to-30mm;
If the 6th step measured value all meets accuracy requirement, then show that the rectangular coordinate system set up is set up;
If measured value does not meet accuracy requirement, then offset corresponding coordinate axle, return the 3rd step and set up new rectangular coordinate system;
7th step, import in laser tracking measurement system by the D coordinates value of flange bolt, wherein Z axis coordinate figure is 0;
8th step, according to the X, the Y-coordinate value that import, determine the position of flange bolt in the rectangular coordinate system set up, and utilize laser tracking measurement system accurately to be navigated on bulkhead by flange bolt;
9th step, measure the Z axis coordinate figure of all flange bolt pedestals with laser tracking measurement system;
Tenth step, the X, Y, Z axis coordinate figure of the flange bolt pedestal measured is imported in GTTLISS software, the Z axis coordinate design load of more each flange bolt and the difference of measured value, the thickness of pad needed for calculating on each flange bolt.
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| CN201310265265.XA CN103353279B (en) | 2013-06-28 | 2013-06-28 | A kind of LNG ship cargo tank insulated case and the pinpoint method of flange bolt |
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| CN201310265265.XA CN103353279B (en) | 2013-06-28 | 2013-06-28 | A kind of LNG ship cargo tank insulated case and the pinpoint method of flange bolt |
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| CN103353279B true CN103353279B (en) | 2015-11-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109606544B (en) * | 2018-05-31 | 2020-12-04 | 沪东中华造船(集团)有限公司 | Dotting and preassembling method for LNG ship cargo tank base |
| CN113280796B (en) * | 2021-05-25 | 2023-03-14 | 江南造船(集团)有限责任公司 | Method for surveying inclined plane corrugated axis of MARK III type cargo tank |
| CN113804130B (en) * | 2021-10-29 | 2024-08-16 | 江南造船(集团)有限责任公司 | Laser tracker-based MARK III type cargo tank bulkhead surface flatness measurement method |
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| DE4317410A1 (en) * | 1993-05-18 | 1994-11-24 | Deutsche Bahn Ag | Arrangement and method for the contactless measurement of workpieces having large diameter differences on machine tools |
| CN101644559A (en) * | 2009-09-11 | 2010-02-10 | 沪东中华造船(集团)有限公司 | Measuring tool and measuring method for adjusting gasket thickness in mounting of ship equipment |
| CN101797728A (en) * | 2009-12-14 | 2010-08-11 | 大连船舶重工集团有限公司 | Anchor plate positioning template device for liquefied natural gas (LNG) ship liquid tank containment system |
| CN201909603U (en) * | 2010-12-28 | 2011-07-27 | 沪东中华造船(集团)有限公司 | Positioning measurement device for box feet at hatch opening cover on container ship |
| CN202903195U (en) * | 2012-11-16 | 2013-04-24 | 中国科学院金属研究所 | Indexing and positioning precision online monitoring system for bent upsetting of marine crank shaft |
-
2013
- 2013-06-28 CN CN201310265265.XA patent/CN103353279B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4317410A1 (en) * | 1993-05-18 | 1994-11-24 | Deutsche Bahn Ag | Arrangement and method for the contactless measurement of workpieces having large diameter differences on machine tools |
| CN101644559A (en) * | 2009-09-11 | 2010-02-10 | 沪东中华造船(集团)有限公司 | Measuring tool and measuring method for adjusting gasket thickness in mounting of ship equipment |
| CN101797728A (en) * | 2009-12-14 | 2010-08-11 | 大连船舶重工集团有限公司 | Anchor plate positioning template device for liquefied natural gas (LNG) ship liquid tank containment system |
| CN201909603U (en) * | 2010-12-28 | 2011-07-27 | 沪东中华造船(集团)有限公司 | Positioning measurement device for box feet at hatch opening cover on container ship |
| CN202903195U (en) * | 2012-11-16 | 2013-04-24 | 中国科学院金属研究所 | Indexing and positioning precision online monitoring system for bent upsetting of marine crank shaft |
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