CN112158310A - Positioning and mounting method for pump tower of LNG ship - Google Patents
Positioning and mounting method for pump tower of LNG ship Download PDFInfo
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- CN112158310A CN112158310A CN202010362823.4A CN202010362823A CN112158310A CN 112158310 A CN112158310 A CN 112158310A CN 202010362823 A CN202010362823 A CN 202010362823A CN 112158310 A CN112158310 A CN 112158310A
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- pump tower
- deck
- carbon steel
- section
- segment
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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
- B63B73/20—Building or assembling prefabricated vessel modules or parts other than hull blocks, e.g. engine rooms, rudders, propellers, superstructures, berths, holds or tanks
Abstract
The invention discloses a positioning and installing method of a pump tower of an LNG ship, which specifically comprises the following steps: manufacturing a liquid dome section and a deck section; marking a first sample punching mark on an inner deck of the liquid dome section, and marking a second sample punching mark on the inner deck of the deck section; carrying the deck section on the cargo hold, and reversely plugging the second sample punching mark on the deck section onto a bottom plate in the ship body of the cargo hold so as to determine the installation position of the pump tower base; installing a pump tower base, and hoisting a pump tower on the pump tower base; hoisting the liquid dome segment into a hole of the deck segment, and aligning a first flushing mark on the liquid dome segment with the axis of the pump tower; and welding the liquid dome segment, the pump tower, the cargo hold and the deck segment into a whole. The invention not only improves the positioning and mounting precision of the pump tower, but also shortens the construction progress of the ship and shortens the construction period of the ship.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a positioning and mounting method for a pump tower of an LNG ship.
Background
The pump tower is a main channel for the LNG to enter and exit the liquid cargo tank, the height of the pump tower is up to 30m, the installation and positioning of the pump tower are a great technical difficulty for building an LNG ship and an important production node, and the hoisting progress of the pump tower has great influence on the period of subsequent ending work. The traditional hoisting method of the pump tower consumes a large amount of manpower and material resources, greatly prolongs the construction period, and cannot ensure the installation precision of the pump tower, so that the installation and construction precision of the pump tower cannot meet the requirement.
Disclosure of Invention
In view of the above, the present invention provides a method for positioning and installing a pump tower of an LNG ship, so as to solve the problems in the background art.
A method for positioning and installing a pump tower of an LNG ship specifically comprises the following steps:
s1, manufacturing a liquid dome section and a deck section;
s2, marking a first stamping mark on the inner deck of the liquid dome section, and marking a second stamping mark on the inner deck of the deck section;
s3, carrying the deck section on the cargo hold, and refuting the second sample flushing mark on the deck section onto a bottom plate in the cargo hold so as to determine the installation position of the pump tower base;
s4, mounting a pump tower base, and hoisting a pump tower on the pump tower base;
s5, hoisting the liquid dome segment into the hole of the deck segment, and aligning the first flushing mark on the liquid dome segment with the axis of the pump tower;
and S6, welding the liquid dome section, the pump tower, the cargo hold and the deck section into a whole.
Preferably, the first plunger mark is marked at a hard gear position around the hole on the inner deck of the liquid dome section;
the second punch mark is marked at the hard position of the inner deck of the deck section.
Preferably, the hard stage positions include rib positions, stringers, ribs.
Preferably, the specific steps of manufacturing the liquid dome segment in step S1 are as follows:
s11, reversely building carbon steel segments;
s12, overturning and hoisting the carbon steel segment to the inner deck, so that the circle center of the first round hole in the carbon steel segment is coincided with the circle center of the second round hole in the inner deck;
s13, welding the joint of the carbon steel segment and the inner deck by adopting a symmetrical welding process to form a liquid dome segment;
and S14, checking the flatness of the carbon steel segment and the inner deck and the straightness of the carbon steel segment, and correcting the deformation position.
Preferably, the concrete steps of inversely constructing the carbon steel segment in the step S11 are as follows:
and placing the trap deck on the ground, and welding and fixing the carbon steel plate on the trap deck by taking the trap deck as a base surface according to a construction drawing.
Preferably, the step S12 of turning over and hoisting the carbon steel segment to the inner deck to make the center of the first circular hole in the carbon steel segment coincide with the center of the second circular hole in the inner deck includes the following specific steps:
firstly, fixing an inner deck on a jig frame;
then, finding the circle center of a second round hole on the inner deck by using a plumb bob method and projecting and marking the circle center on the ground;
and finally, turning the carbon steel segment to be normal, hoisting and placing the carbon steel segment on the inner deck, and enabling the circle center of the first round hole and the circle center of the second round hole on the trap deck of the carbon steel segment to coincide by using a plumb bob method according to marks on the ground.
Preferably, the coincidence deviation between the circle center of the first round hole and the circle center of the second round hole is not more than 2 mm.
Preferably, the specific steps of refuting the second punching mark on the deck section onto the hull inner bottom plate of the cargo hold to determine the installation position of the pump tower base in the step S3 are as follows:
firstly, placing a total station on a bottom plate in a ship body in a cargo hold;
secondly, establishing a three-dimensional coordinate system by taking the plane of the bottom plate in the ship body as an XY plane;
then, adjusting the total station to a tracking measurement mode, refuting a second sample flushing mark on the deck section onto a bottom plate in the ship body by using the total station, and determining the installation position of the marked pump tower base;
and finally, protecting the marked installation position of the pump tower base by using an adhesive tape.
Preferably, when the pump tower is hung on the pump tower base in the step S4, the deviation between the axis of the pump tower and the marked position of the pump tower base is not more than 2mm, and the deviation of the perpendicularity of the pump tower is not more than 2 mm.
The invention has the beneficial effects that:
1. according to the invention, the marks are marked on the liquid dome section and the deck section, and the mounting position of the pump tower base is determined according to the marks on the deck section, so that the accuracy of the mounting position of the pump tower is ensured, and then the accuracy of assembling the liquid dome section, the pump tower and the deck section is ensured by combining the marks on the liquid dome section, so that the positioning and mounting accuracy of the pump tower is improved, the construction progress of a ship is improved, and the construction period of the ship is shortened.
2. When the liquid dome section is built, the trap deck and the carbon steel plate are assembled into the carbon steel segment, and then the carbon steel segment and the inner deck are folded into the liquid dome section, so that the building precision of the liquid dome section can be effectively guaranteed, the building quality of the liquid dome section is improved, and the wharf period is shortened.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a segment of liquid dome-segmented carbon steel.
Fig. 2 is a schematic diagram of the structure of the liquid dome section.
Figure 3 is a schematic structural view of the deck section.
Fig. 4 is a schematic diagram of a second slug mark on a deck section.
FIG. 5 is a schematic illustration of a liquid dome segment marked with a first impact mark.
The reference numerals in the figures have the meaning:
1 is a carbon steel segment, 2 is a trap deck, 3 is a carbon steel plate, 4 is an inner deck, 5 is a first round hole, 6 is a liquid dome segment, 7 is a deck segment, and 8 is a hole.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance unless explicitly stated or limited otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention provides a method for positioning and installing a pump tower of an LNG ship, which specifically comprises the following steps:
s1, making a liquid dome section 6 and a deck section 7.
In particular, the deck section 7 is manufactured according to a conventional construction process according to construction drawings.
The manufacturing of the liquid dome section 6 comprises the specific steps of:
s11, carbon steel segment 1 is constructed in a reverse state.
Specifically, the trap deck 2 is placed on the ground, and then the carbon steel plate 3 is welded and fixed on the trap deck 2 by taking the trap deck 2 as a base surface according to a construction drawing.
The carbon steel segment 1 is constructed in the same tire as the deck section 7 of the hull.
After the carbon steel segment 1 is built, the straightness of the edge of the longitudinal and transverse rib plate and the deviation of the installation position of each carbon steel plate 3 in the carbon steel segment 1 are detected by using a total station.
And S12, overturning and hoisting the carbon steel segment 1 onto the stainless steel inner deck 4, so that the circle center of a first round hole 5 on the carbon steel segment 1 coincides with the circle center of a second round hole (not shown in figure 2) on the inner deck 4.
Specifically, first, the inner deck 4 is fixed on the jig frame;
then, finding the circle center of a second round hole on the inner deck 4 by a plumb bob method and projecting and marking the circle center on the ground;
then, turning over the carbon steel segment 1 to be normal, hoisting the carbon steel segment to be moved into an inner field, placing the carbon steel segment on an inner deck 4, and folding the carbon steel segment and the inner deck 4; then, according to the projection point of the center of the second round hole marked on the ground, the position of the carbon steel segment 1 is adjusted, so that the center of the first round hole 5 on the trap deck 2 of the carbon steel segment 1 coincides with the center of the second round hole (the center of the first round hole 5 coincides with the center of the second round hole by using a plumb bob method).
The coincidence deviation between the circle center of the first round hole 5 and the circle center of the second round hole is not more than 2 mm.
And S13, welding and fixing the joint of the carbon steel segment 1 and the inner deck 4 to form the liquid dome section 6.
When the carbon steel segment 1 and the inner deck 4 are welded, a welding process of symmetrical welding is adopted to ensure that the circle center of a first round hole 5 on the carbon steel segment 1 is always coincident with the circle center of a second round hole on the inner deck 4.
And S14, checking the flatness of the carbon steel segment 1 and the inner deck 4 and the straightness of each carbon steel plate 3 in the carbon steel segment 1, judging whether the carbon steel segment 1 or the inner deck 4 is deformed in the welding process, and if so, performing beating correction on the deformed position.
And S2, marking a first stamping mark on the inner deck 4 of the liquid dome section, and marking a second stamping mark on the inner deck of the deck section 7.
The first stamping mark is marked at the position of a hard gear around the hole 8 on the inner deck of the liquid dome section 6, such as the position of a rib around the hole 8 and the position of a longitudinal girder.
The second stamping marks are marked at hard gear positions of the inner deck of the deck section 7, such as positions of ribs, stringers and ribs on the inner deck of the deck section 7.
In this embodiment, six first stamping marks are marked around the holes on the inner deck of the liquid dome section 6, and are respectively marked as a ', B', C ', D', E 'and F', wherein the marks a ', C', D 'and F' are located at the rib positions of the inner deck of the liquid dome section 6, and the marks B 'and E' are located at the stringer positions of the inner deck of the liquid dome section. The inner deck of deck section 7 is marked with six second punch-like markings, designated A, B, C, D, E, F, wherein A, C, D, F is located at the ribs of the inner deck of deck section 7 and B, E is located at the stringers of the inner deck of deck section 7.
S3, the deck section 7 is mounted on the cargo hold, and the second bump markers on the deck section 7 are refunded to the bottom plate in the cargo hold hull to determine the mounting positions of the pump tower bases (six mounting positions of the pump tower bases are a1, B1, C1, D1, E1, and F1).
Specifically, firstly, a total station is placed on a bottom plate in a ship body in a cargo hold;
secondly, establishing a three-dimensional coordinate system by taking the plane of the bottom plate in the ship body as an XY plane;
then, adjusting the total station to a tracking measurement mode, refuting a second sample flushing mark on the deck section onto a bottom plate in the ship body by using the total station, and determining the installation position of the marked pump tower base;
and finally, protecting the marked installation position of the pump tower base by using an adhesive tape, and taking the protected installation position as a reference for subsequent hoisting and positioning of the pump tower.
And S4, installing a pump tower base, and hoisting the pump tower on the pump tower base after the pump tower base is installed. The deviation between the axis of the pump tower and the marked position of the pump tower base is not more than 2mm, and the perpendicularity deviation of the pump tower is not more than 2 mm.
S5, hoisting the liquid dome section 6 into the hole 8 of the deck section 7, and aligning the first flushing mark on the liquid dome section 6 with the axis of the pump tower;
and S6, welding the liquid dome section 6, the pump tower, the cargo hold and the deck section 7 into a whole, and performing tracking measurement to avoid deviation caused by welding by ensuring the contact ratio of the axle center of the pump tower and the first stamping mark on the liquid dome section during welding.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for positioning and installing a pump tower of an LNG ship is characterized by comprising the following steps:
s1, manufacturing a liquid dome section and a deck section;
s2, marking a first stamping mark on the inner deck of the liquid dome section, and marking a second stamping mark on the inner deck of the deck section;
s3, carrying the deck section on the cargo hold, and refuting the second sample flushing mark on the deck section onto a bottom plate in the cargo hold so as to determine the installation position of the pump tower base;
s4, mounting a pump tower base, and hoisting a pump tower on the pump tower base;
s5, hoisting the liquid dome segment into the hole of the deck segment, and aligning the first flushing mark on the liquid dome segment with the axis of the pump tower;
and S6, welding the liquid dome section, the pump tower, the cargo hold and the deck section into a whole.
2. The LNG ship pump tower positioning installation method of claim 1, wherein the first flush marks are marked at hard gear positions around the holes on the inner deck of the liquid dome section;
the second punch mark is marked at the hard position of the inner deck of the deck section.
3. The LNG ship pump tower positioning installation method of claim 2, wherein the hard stage position comprises rib position, stringer and rib.
4. The LNG ship pump tower positioning and installing method of claim 1, wherein the specific steps of manufacturing the liquid dome section in the step S1 are as follows:
s11, reversely building carbon steel segments;
s12, overturning and hoisting the carbon steel segment to the inner deck, so that the circle center of the first round hole in the carbon steel segment is coincided with the circle center of the second round hole in the inner deck;
s13, welding the joint of the carbon steel segment and the inner deck by adopting a symmetrical welding process to form a liquid dome segment;
and S14, checking the flatness of the carbon steel segment and the inner deck and the straightness of the carbon steel segment, and correcting the deformation position.
5. The LNG ship pump tower positioning and installing method of claim 4, wherein the concrete steps of reversely building the carbon steel segments in the step S11 are as follows:
and placing the trap deck on the ground, and welding and fixing the carbon steel plate on the trap deck by taking the trap deck as a base surface according to a construction drawing.
6. The LNG ship pump tower positioning and mounting method according to claim 5, wherein the step S12 of turning over and hoisting the carbon steel segment to the inner deck to make the circle center of the first circular hole in the carbon steel segment coincide with the circle center of the second circular hole in the inner deck comprises the following specific steps:
firstly, fixing an inner deck on a jig frame;
then, finding the circle center of a second round hole on the inner deck by using a plumb bob method and projecting and marking the circle center on the ground;
and finally, turning the carbon steel segment to be normal, hoisting and placing the carbon steel segment on the inner deck, and enabling the circle center of the first round hole and the circle center of the second round hole on the trap deck of the carbon steel segment to coincide by using a plumb bob method according to marks on the ground.
7. The LNG ship pump tower positioning and mounting method according to claim 6, wherein the coincidence deviation between the circle center of the first circular hole and the circle center of the second circular hole is not more than 2 mm.
8. The LNG ship pump tower positioning and installation method of claim 1, wherein the specific steps of refuting the second flushing marks on the deck section onto the in-hull bottom plate of the cargo hold to determine the installation position of the pump tower base in step S3 are as follows:
firstly, placing a total station on a bottom plate in a ship body in a cargo hold;
secondly, establishing a three-dimensional coordinate system by taking the plane of the bottom plate in the ship body as an XY plane;
then, adjusting the total station to a tracking measurement mode, refuting a second sample flushing mark on the deck section onto a bottom plate in the ship body by using the total station, and determining the installation position of the marked pump tower base;
and finally, protecting the marked installation position of the pump tower base by using an adhesive tape.
9. The LNG ship pump tower positioning and mounting method as claimed in claim 1, wherein when the pump tower is hung on the pump tower base in the step S4, the deviation between the axis of the pump tower and the marked position of the pump tower base is not more than 2mm, and the deviation of the perpendicularity of the pump tower is not more than 2 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010362823.4A CN112158310B (en) | 2020-04-30 | 2020-04-30 | Positioning and mounting method for pump tower of LNG ship |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010362823.4A CN112158310B (en) | 2020-04-30 | 2020-04-30 | Positioning and mounting method for pump tower of LNG ship |
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| CN112158310A true CN112158310A (en) | 2021-01-01 |
| CN112158310B CN112158310B (en) | 2022-12-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114179992A (en) * | 2021-11-18 | 2022-03-15 | 上海江南长兴造船有限责任公司 | Novel method for inspecting material of pump tower base of LNG (liquefied Natural gas) fuel tank of double-fuel ship |
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| KR20120097068A (en) * | 2011-02-24 | 2012-09-03 | 대우조선해양 주식회사 | Cargo treatment equipment for lng carrier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114179992A (en) * | 2021-11-18 | 2022-03-15 | 上海江南长兴造船有限责任公司 | Novel method for inspecting material of pump tower base of LNG (liquefied Natural gas) fuel tank of double-fuel ship |
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| CN112158310B (en) | 2022-12-13 |
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