CN115416823A - Precision control method for CM (CM) node constructed by LNG (liquefied Natural gas) ship - Google Patents
Precision control method for CM (CM) node constructed by LNG (liquefied Natural gas) ship Download PDFInfo
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- CN115416823A CN115416823A CN202210953586.8A CN202210953586A CN115416823A CN 115416823 A CN115416823 A CN 115416823A CN 202210953586 A CN202210953586 A CN 202210953586A CN 115416823 A CN115416823 A CN 115416823A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003949 liquefied natural gas Substances 0.000 title description 17
- 238000003466 welding Methods 0.000 claims abstract description 88
- 238000007689 inspection Methods 0.000 claims abstract description 21
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 8
- 239000012634 fragment Substances 0.000 claims abstract description 7
- 238000012937 correction Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000003973 paint Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
- B63B73/40—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by joining methods
- B63B73/43—Welding, e.g. laser welding
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- Architecture (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a method for controlling precision of a CM (CM) node constructed by an LNG ship, which comprises the following steps of: step one, processing raw materials; detecting the size of each part plate, measuring and recording the original data of the part plate, and performing secondary processing on the part plates which do not meet the standard; step two, manufacturing a horizontal jig frame of the box body; step three, manufacturing box body fragments; carrying out plate laying and scribing on the inner bottom plate and the longitudinal truss plate, assembling and folding on a horizontal jig frame of the box body, and welding an inner bottom plate segment and a longitudinal truss plate segment; step four, inspecting the box body fragments; checking the straightness of the box body segment and performing fire correction; step five, CM node assembly inspection; detecting the node by using the inner card sample plate and the outer card sample plate; step six, welding a CM node; the welding mode adopts sectional annealing, and the welding sequence is symmetrically performed from the middle to the two ends. The invention can reduce the working hours wasted in flatness adjustment in the subsequent stage, improve the sectional construction efficiency and ensure the construction quality of the ship.
Description
Technical Field
The invention belongs to the technical field of ship construction, and particularly relates to a CM node precision control method for LNG ship construction.
Background
Local structures generate large stresses when the ship is in transit and loaded, and these areas are called critical areas. The stresses at the hazardous area must be efficiently transferred and released, i.e. structurally correspond. Therefore, the structural nodes of the critical area must be strictly monitored, called CM.
The liquefied natural gas carrier is a ship special for transporting liquefied natural gas, and is called an LNG (liquefied natural gas) carrier for short. The main component of liquefied natural gas is methane, which is usually liquefied by cryogenic freezing at atmospheric pressure (-165 ℃) for ease of transportation. At present, most LNG ships adopt film type liquid cargo tanks, and the LNG ships are divided into GTT types and Mark III types according to different heat insulation types and construction modes. The Mark III type cargo hold is composed of an insulating plate and a rigid insulating material, and the construction precision control of the sectional CM node of the film type cargo hold is the key work of sectional construction.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the precision control method for the CM node constructed by the LNG ship.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a precision control method for constructing a CM (CM) node by an LNG (liquefied natural gas) ship, which comprises the following steps of:
step one, processing raw materials; detecting the size of each part plate, measuring and recording the original data of the part plate, and performing secondary processing on the part plates which do not meet the standard;
step two, manufacturing a horizontal jig frame of the box body;
step three, manufacturing a box body segment; carrying out plate laying and scribing on the inner bottom plate and the longitudinal truss plate, assembling and folding on a horizontal jig frame of the box body, and welding an inner bottom plate segment and a longitudinal truss plate segment;
step four, inspecting the box body fragments; checking the straightness of the box body segment and performing fire correction;
step five, CM node assembly inspection; detecting the nodes by using the inner card sample plate and the outer card sample plate;
step six, welding a CM node; the welding mode adopts sectional annealing, and the welding sequence is symmetrically performed from the middle to the two ends.
Preferably, in the second step, the height deviation of the horizontal jig frame of the box body is less than 2mm.
As a preferred technical solution, the third step specifically includes the following steps:
s3.1, paving a floor on the inner bottom plate on the jig frame, fixing the floor by using a clamp Ma Gangxing, and keeping the inner bottom plate attached to the jig frame;
s3.2, marking the inner bottom plate, marking the thickness direction of the plate, wherein the marking deviation is less than or equal to 1mm, knocking 100mm inspection line ocean punch of the longitudinal girder at the front and back of each rib plate, and using a paint pen to circle the inspection line ocean punch;
s3.3, assembling and welding the T rows of the inner bottom plate by adopting a sectional annealing method, wherein the welding sequence is symmetrically welded from the middle to the two ends
S3.4, paving and scribing the longitudinal girder plate steel platform, marking the plate thickness direction, marking the scribing deviation to be less than or equal to 1mm, knocking 100mm inspection line foreign punch of each rib plate, and using a paint pen to circle out the foreign punch;
s3.5, assembling and welding rib plates;
s3.6, turning over the longitudinal girder plates, correcting the longitudinal girder plates in place by firer, performing refuting and foreign flushing, and circling out by using a paint pen;
s3.7, positioning the inner bottom plate on a horizontal jig frame of the box body, hoisting the rib plates and the longitudinal girders to the inner bottom plate, assembling and positioning, and controlling an assembling gap and an end difference;
s3.8, welding rib plates and the inner bottom plate segments, welding middle rib plates, and then sequentially welding rib plates on two sides of the bow and the stern; a region needing fusion penetration welding is welded on one side firstly after a groove is cleaned, and then welding is carried out after back carbon gouging is carried out; welding the longitudinal girder plate segment and the inner bottom segment, wherein the welding mode adopts sectional annealing, and the welding sequence is symmetrically performed from the middle to the two ends; the outer plate side fillet welding of the welding longitudinal girder and the rib plate is more than or equal to 300mm;
s3.9, after the hanging rings are installed, turning over and welding are carried out by taking the longitudinal girders as base planes, welding middle rib plates, and then sequentially welding rib plates on two sides of the bow and the stern; and (4) melting through a welding area, cleaning a groove, welding one side, and performing carbon back gouging on the reverse side and then welding.
In the fourth step, after the whole box body segment is finished, the straightness of the box body is checked by a free-state stay wire, the straightness deviation of two directions at the node of the inner bottom plate is checked, and the control deviation is within 3 mm.
As a preferred technical solution, the step five specifically includes the following steps:
s5.1, building segmented normal closure of bilge parts, positioning and scribing an outer plate on a bed plate on a jig frame, welding rib plate and half rib plate parts, hoisting an inner bottom box body, and finally assembling a hoisting platform bulk part and a bevel side plate;
s5.2, after the box body parts are folded in place, marking out longitudinal girder 100mm detection lines at two ends of the box body according to a drawing, knocking and springing the lines at the two ends, and using a U-shaped tooling ruler to check the precision of the 100mm detection lines and knocking a sample punch at the middle position;
s5.3, when the node assembly is reported and checked, local sampling inspection is carried out, the accuracy of the inspection line sample punching is confirmed, and corresponding marks are made.
As a preferred technical scheme, the sixth step is specifically: each welding line is equally divided into a plurality of sections, and the welding lines are symmetrically welded from the middle position to the two sides in sequence.
In a preferred technical solution, in the sixth step, the welding manner is multilayer multi-pass welding.
Compared with the prior art, the invention has the following technical effects:
the method can reduce the working hours wasted in flatness adjustment in the subsequent stage, improve the sectional construction efficiency, ensure the construction quality of the ship, and provide experience and reference for the subsequent sectional construction of the cargo hold of the LNG ship.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a welding sequence diagram of a CM node according to the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The embodiment provides a method for controlling precision of a CM (CM) node constructed by an LNG ship, which comprises the following steps:
step one, processing raw materials; and detecting the size of each part plate, measuring and recording the original data of the part plate, and performing secondary processing on the part plates which do not conform to the standard.
Step two, manufacturing a box body plane jig frame; and (3) building a box body plane jig frame in a part stage, reporting precision group inspection after building is completed, and requiring that the height deviation is less than or equal to 2mm. And (3) scribing a bed-jig base line on the field by using a laser theodolite, and then installing an angle steel strut and a channel steel base to finish the manufacture of the horizontal bed-jig of the box body. The box body jig frame is erected on the field, and the verticality is guaranteed by using a plumb bob method. And (4) installing a longitudinal brace, installing a channel steel inclined strut at the lower opening side, and properly increasing angle steel inclined struts around the rest. And (4) testing the jig frame report accuracy group to ensure that the jig frame surface is horizontal.
Step three, manufacturing box body fragments; and (3) paving a bed frame on the inner bottom plate, fixing by using a small square block clamp Ma Gangxing, and keeping close contact with the bed frame. Marking the inner bottom plate, marking the thickness direction of the plate, ensuring that the marking deviation is less than or equal to 1mm, knocking 100mm inspection lines of the longitudinal girders at the front and back of each rib plate, and circling out by using a paint pen. Assembling and welding the T rows of the inner bottom plates, adopting a sectional annealing method, and symmetrically welding the T rows of the inner bottom plates from the middle to two ends in a welding sequence; and (3) paving and scribing the longitudinal girder plate steel platform, marking the plate thickness direction, ensuring that the scribing deviation is less than or equal to 1mm, knocking 100mm inspection line foreign impact of each rib plate, and using a paint pen to circle out. And after the longitudinal girder plates are turned over and corrected in place by the fire (the contraction value of the longitudinal girder is increased by 3 mm), carrying out reverse refuting and ocean punching, and using a paint pen to circle the longitudinal girder plates. Positioning the inner bottom plate on the horizontal jig frame, hoisting the rib plates and the longitudinal girders to the inner bottom plate, assembling and positioning, and controlling an assembling gap and an end difference; the rib plates are welded with the inner bottom plate segments, the middle rib plate is welded firstly, and then the rib plates on the two sides of the bow and the stern are welded in sequence; a region needing fusion penetration welding is welded on one side firstly after a groove is cleaned, and then welding is carried out after back carbon gouging is carried out; welding the longitudinal truss plate segment and the inner bottom segment, wherein the welding mode adopts sectional annealing, and the welding sequence is symmetrically performed from the middle to the two ends; the outside plate side fillet welding of the welding longitudinal girder and the ribbed plate is more than or equal to 300mm. After the lifting rings are installed, 4 turning-over main hook lifting rings are required, turning-over welding is carried out by taking the longitudinal girders as base planes, middle rib plates are welded firstly, and then rib plates on two sides of a bow and a stern are welded in sequence; and (3) in a region needing fusion welding, cleaning a groove, welding one side, and performing carbon back gouging on the back side and then welding.
Step four, inspecting the box body fragments; after the box body segments are integrally finished, the straightness of the box body is tested by pulling wires in a free state, and the straightness deviation in two directions at the node of the inner bottom plate is tested and is within 3 mm; if the box straightness deviates, the inner bottom plate and the longitudinal girders are subjected to fire correction, and the straightness requirements are met through inspection after cooling.
Step five, CM node assembly inspection; and the outer plate is positioned and scribed on the upper bed plate of the jig frame, the ribbed plate and the half ribbed plate part are welded, the inner bottom box body is hoisted, and finally the loose part of the hoisting platform and the inclined side plate are assembled. After the body parts are folded in place, drawing out longitudinal girder 100mm detection lines at two ends of the box body according to a drawing, knocking oceanic punches at two ends (namely, 100mm positions away from a 10623/CL theoretical line) and springing the lines, and using a U-shaped tooling ruler to detect the precision of the 100mm detection lines and knocking sample punches at the middle position; when the nodes are assembled and checked, a special tool is locally used for sampling inspection, the accuracy of the inspection line sample punching is confirmed, and corresponding marks are made. And after welding, the nodes are inspected mainly by the outer card sample plate, and when the nodes are assembled and inspected before welding, the nodes are inspected by using the inner card sample plate and the outer card sample plate and the position of an inspection line is confirmed.
Welding a CM node; the construction is carried out according to welding process parameters, the welding heat input quantity is limited, and in addition, the welding deformation quantity can be effectively controlled by adopting a multi-layer and multi-pass welding mode. The deformation is controlled by adopting a mode of split symmetrical welding and sectional back welding. The method comprises the following specific steps: each welding seam is equally divided into a plurality of sections, and the welding seams are symmetrically welded from the middle position to the two sides in sequence. The center-dividing symmetrical welding can symmetrically extend the deformation free end to two sides, and the deformation can be reduced by adopting the sectional back welding mode in a reverse order with the large direction on a smaller level. The welding sequence is shown in fig. 1.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (7)
1. The method for controlling the precision of the CM node constructed by the LNG ship is characterized by comprising the following steps of:
step one, processing raw materials; detecting the size of each part plate, measuring and recording the original data of the part plate, and performing secondary processing on the part plates which do not meet the standard;
step two, manufacturing a horizontal jig frame of the box body;
step three, manufacturing box body fragments; carrying out plate laying and scribing on the inner bottom plate and the longitudinal truss plate, assembling and folding on a horizontal jig frame of the box body, and welding an inner bottom plate segment and a longitudinal truss plate segment;
step four, inspecting the box body fragments; checking the straightness of the box body segment and performing fire correction;
step five, CM node assembly inspection; detecting the nodes by using the inner card sample plate and the outer card sample plate;
welding a CM node; the welding mode adopts sectional annealing, and the welding sequence is symmetrically performed from the middle to the two ends.
2. The method for controlling the accuracy of the CM node in LNG ship construction according to claim 1, characterized in that in the second step, the height deviation of the horizontal jig frame of the tank body is less than 2mm.
3. The method for controlling the accuracy of the CM node in LNG ship construction according to claim 1, wherein the third step specifically comprises the following steps:
s3.1, paving a floor on the inner bottom plate on the jig frame, fixing the floor by using a clamp Ma Gangxing, and keeping the inner bottom plate attached to the jig frame;
s3.2, marking the inner bottom plate, marking the thickness direction of the plate, wherein the marking deviation is less than or equal to 1mm, knocking a 100mm inspection line ocean punch of the stringer from front to back of each rib plate, and using a paint pen to circle out the inspection line;
s3.3, assembling and welding the T rows of the inner bottom plate by adopting a sectional annealing method, wherein the welding sequence is symmetrically welded from the middle to the two ends
S3.4, paving and scribing the longitudinal girder plate steel platform, marking the plate thickness direction, marking the scribing deviation to be less than or equal to 1mm, knocking 100mm inspection line foreign punch of each rib plate, and using a paint pen to circle out the foreign punch;
s3.5, assembling and welding the rib plates;
s3.6, turning over the longitudinal truss plate, correcting the longitudinal truss plate in place by firer, refuting foreign impact, and circling out by using a paint pen;
s3.7, positioning the inner bottom plate on a horizontal jig frame of the box body, hoisting the rib plates and the longitudinal girders to the inner bottom plate, assembling and positioning, and controlling an assembling gap and an end difference;
s3.8, welding rib plates and inner bottom plate segments, namely welding middle rib plates, and then sequentially welding rib plates on two sides of the bow and the stern; a fusion penetration welding area is needed, after the groove is cleaned, one side is welded firstly, and the back side is carbon planed to be back-rooted and then welded; welding the longitudinal truss plate segment and the inner bottom segment, wherein the welding mode adopts sectional annealing, and the welding sequence is symmetrically performed from the middle to the two ends; the outer plate side fillet welding of the welding longitudinal girder and the rib plate is more than or equal to 300mm;
s3.9, after the hanging rings are installed, turning over and welding are carried out by taking the longitudinal girders as base planes, welding middle rib plates, and then sequentially welding rib plates on two sides of the bow and the stern; and (4) melting through a welding area, cleaning a groove, welding one side, and performing carbon back gouging on the reverse side and then welding.
4. The method for controlling the precision of the CM node for LNG ship construction as claimed in claim 1, wherein in the fourth step, after the whole segment of the tank body is completed, the straightness of the tank body is checked by a free-state stay wire, the deviation of the straightness of the node of the inner bottom plate in two directions is checked, and the control deviation is within 3 mm.
5. The method for controlling the accuracy of the CM node in LNG ship construction according to claim 1, characterized in that the fifth step specifically includes the following steps:
s5.1, building segmented normal closure of bilge parts, positioning and scribing an outer plate on a bed plate on a jig frame, welding rib plate and half rib plate parts, hoisting an inner bottom box body, and finally assembling a hoisting platform bulk part and a bevel side plate;
s5.2, after the box body parts are folded in place, marking out longitudinal girder 100mm detection lines at two ends of the box body according to a drawing, knocking and springing the lines at the two ends, and using a U-shaped tooling ruler to check the precision of the 100mm detection lines and knocking a sample punch at the middle position;
s5.3, when the node assembly is reported and checked, local sampling inspection is carried out, the accuracy of the inspection line sample punching is confirmed, and corresponding marks are made.
6. The method for controlling the accuracy of construction of the CM node by the LNG carrier according to claim 1, wherein the sixth step is specifically: each welding line is equally divided into a plurality of sections, and the welding lines are symmetrically welded from the middle position to the two sides in sequence.
7. The method for controlling the accuracy of the CM node in LNG ship construction according to claim 1, characterized in that in the sixth step, the welding mode adopts multilayer multi-pass welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210953586.8A CN115416823A (en) | 2022-08-10 | 2022-08-10 | Precision control method for CM (CM) node constructed by LNG (liquefied Natural gas) ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210953586.8A CN115416823A (en) | 2022-08-10 | 2022-08-10 | Precision control method for CM (CM) node constructed by LNG (liquefied Natural gas) ship |
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| Publication Number | Publication Date |
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| CN115416823A true CN115416823A (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210953586.8A Withdrawn CN115416823A (en) | 2022-08-10 | 2022-08-10 | Precision control method for CM (CM) node constructed by LNG (liquefied Natural gas) ship |
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| Country | Link |
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| CN (1) | CN115416823A (en) |
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2022
- 2022-08-10 CN CN202210953586.8A patent/CN115416823A/en not_active Withdrawn
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Application publication date: 20221202 |