CN109854050A - The connection method of LNG tank primary tank bottom ring wall plate and annular slab - Google Patents
The connection method of LNG tank primary tank bottom ring wall plate and annular slab Download PDFInfo
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- CN109854050A CN109854050A CN201910207032.1A CN201910207032A CN109854050A CN 109854050 A CN109854050 A CN 109854050A CN 201910207032 A CN201910207032 A CN 201910207032A CN 109854050 A CN109854050 A CN 109854050A
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- ring wall
- wall plate
- bottom ring
- annular slab
- siding
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Abstract
A kind of connection method of LNG tank primary tank bottom ring wall plate and annular slab, first prefabricated several piece bottom ring wall plate before installing when installation, several piece bottom ring wall plate are positioned on annular slab, and form circumferential one and enclose；The concave slot matched and U-type groove, and prefabricated unilateral 50 ° of grooves or not prefabricated groove are respectively equipped at the bottom ring wall plate and annular slab connecting pin；It and is gapless group pair between bottom ring wall plate and annular slab.The present invention not only solves primary tank bottom ring wall plate and caused joint fatigue strength reduction problem is reprocessed in the welding of annular slab connector easy " blocking ", reduces difficulty of construction；Moreover, also solving the problem of can not making the effectively construction qualities such as detection to junction air-tightness by design specification requirement, the security performance of LNG tank is substantially increased.
Description
Technical field
The present invention relates to LNG tank more particularly to a kind of LNG tank primary tank bottom ring wall plates and ring
The connection method of shape plate.
Background technique
With the development of economy with the enhancing of people's environmental consciousness, liquefied natural gas (LNG) conduct is a kind of to be cleaned, is efficient
The energy, demand is growing day by day, and this requires must accelerate the developing steps of liquefied natural gas the relevant technologies.It is close for technology
The liquefied natural gas industry of collection type, research and development liquefied natural gas the relevant technologies, especially LNG tank correlation skill
Art has important Social benefit and economic benefit to the development of liquefied natural gas industry.
Currently, LNG tank is broadly divided into according to the mechanics bearing mode for liquid and vapour seal system:
Single appearance tank, double volume tank, full appearance tank and film tank, wherein full appearance tank is the main pot of the domestic reception terminal to put into operation.Entirely
Holding tank includes: a primary tank and time container, wherein primary tank is mainly the single wall tank made of the Steel material of self-supporting, is used
To accommodate liquid working substance, material, in general, using 9% low temperature resistant nickel steel.
Such as Fig. 1, shown in Figure 1A, the primary tank bottom ring wall plate 1 of existing LNG tank is connect with annular slab 4, and one
As using " the method for 30 °, 45 ° and the combined groove installation of bevel angle more than 50 °.Weld seam welding is completed inside and outside siding
Afterwards, soap fluid inspection is done.According to built project situation, the weld seam of this installation method is easy to appear local quilt and " blocks " phenomenon, pole
It is difficult to guarantee hundred meters long or even 250 Yu meter Chang weld seams and is doing the test pressure holding in soap fluid inspection continuously, be not able to satisfy
Design requirement.And " blocking " position must take the welding measure of reprocessing to be repaired.But welding, which is reprocessed, can directly result in low temperature
The low-temperature flexibility of the primary tank key jointing of toughness reguirements harshness deteriorates, more seriously the qualification rate of " welding is reprocessed "
It is relatively low；In the case where there is repair for 2nd time or even repeatedly reprocessing, effect of the jointing in repeated multiple times Thermal Cycle
Under, connector low-temperature flexibility will be reduced seriously, therefore, lead to the tired of the welding point of storage tank primary tank bottom ring wall plate and annular slab
Labor service life reduction has seriously affected the quality and security performance of storage tank.
Such as Fig. 1, shown in Figure 1B, in order to solve above-mentioned technical problem, in the primary tank wall of built LNG tank
When plate is connect with bottom circumferential lamella, using the installation side of fillet weld, full penetration weld or partial penetration weld seam and 45° angle degree type groove
Method；Postwelding uses the characterization processes of " vacuum tank detection+pigmentation and innltration test ".But above-mentioned installation method can not be to this connection
The air-tightness at place makes effective detection, and the requirement of this and tank designs specification is not inconsistent.Therefore, it is necessary to existing liquefied natural gas
Tank wall is further improved.
Summary of the invention
It is a primary object of the present invention to overcome disadvantages mentioned above of the existing technology, and provide a kind of liquefied natural gas storage
The connection method of tank primary tank bottom ring wall plate and annular slab, not only solves primary tank bottom ring wall plate and annular slab connector is easy
Caused joint fatigue strength reduction problem is reprocessed in the welding of " blocking ", ensure that effective implementation of liquid soap detection, is reduced
Difficulty of construction；Moreover, the effectively construction such as detection matter can not be made to junction air-tightness by design specification requirement by also solving
The problem of amount, substantially increases the security performance of LNG tank, extends the service life of storage tank.
The purpose of the present invention is implemented by the following technical solutions:
A kind of LNG tank primary tank bottom ring wall plate and annular slab, it is characterised in that: first prefabricated several piece before installation
When installation, several piece bottom ring wall plate is positioned on annular slab for bottom ring wall plate, and is formed circumferential one and enclosed.
It is respectively equipped with the concave slot matched and U-type groove at the bottom ring wall plate and annular slab connecting pin, and prefabricated unilateral
50 ° of grooves or not prefabricated groove；It and is gapless group pair between bottom ring wall plate and annular slab.
The material of the bottom ring wall plate, annular slab is 9%Ni steel.
A kind of connection method of LNG tank primary tank bottom ring wall plate and annular slab, it is characterised in that: use with
Lower installation steps:
Annular slab is arranged in bottom the first step；Then, then by several piece bottom ring wall plate block-by-block lift in place, wherein foundation ring
It cannot be less than 50mm at a distance from annular slab outer rim on the outside of siding；
T-type seam between bottom ring wall plate and annular slab is fixed second step, and vertically welds completing bottom ring wall plate
After seam welding, then the welding of the seam of bottom ring wall plate and annular slab is carried out, in order to control the welding deformation of annular slab；
Third step, installation platform；
4th step, the second circle siding lifting is in place, and circumferential seam is rigidly fixed；
5th step is enclosed siding group to rear, the construction door opening plate of dismounting first lap siding in completion second, and is completed at door opening
Reinforcing；
Third circle siding is lifted in place, after positioning, then is rigidly fixed, installation platform by the 6th step, then,
The welding of vertical weld seam is completed, after third circle siding whole is in place, circumferential direction between third circle siding and the second circle siding is welded and connects
Seam；
7th step repeats the 6th step until completing the installation of all sidings below, and formation one is closed by siding wall
Storage tank；
8th step after completion bottom ring wall plate is connect with annular slab, carries out the liquid soap detection of weld seam, to ensure attachment weld
Ne-leakage, air-tightness are good.
In the first step, the verticality of bottom ring wall plate must not exceed 15mm；Circularity: between maximum gauge and minimum diameter
Difference must not exceed 31mm；Welding point group controls within the scope of 2-4mm gap；Wrong skin amount must not exceed 2mm；Radius allows
Error is ± 30mm.
In the second step, the T-type seam fixation between bottom ring wall plate and annular slab is using steel fixed block.
In 7th step, after completing the installation of storage tank inner member, then the installation of hole plate is carried out.
Beneficial effects of the present invention: the present invention due to the adoption of the above technical scheme, not only solves primary tank foundation ring wall
Caused joint fatigue strength reduction problem is reprocessed in the welding that plate and annular slab connector are easy " blocking ", ensure that liquid soap is examined
The effective implementation surveyed, reduces difficulty of construction；Moreover, junction air-tightness can not be made by design specification requirement by also solving
The problem of construction qualities such as effective detection, the security performance of LNG tank is substantially increased, the use of storage tank is extended
Service life.
Detailed description of the invention
Fig. 1 is prior art construction schematic diagram.
Figure 1A is that existing tank inside welds schematic diagram.
Figure 1B is that existing tank inside 45° angle degree type groove welds schematic diagram.
Fig. 2 is schematic structural view of the invention.
Fig. 2A is that 50 ° of angle type grooves of structure of the invention tank inside weld schematic diagram.
Fig. 3 is structure of the invention bottom ring wall plate outside and annular slab connection schematic diagram.
Fig. 3 A is that 50 ° of angle type grooves of the another tank inside of structure of the invention weld schematic diagram.
Major Symbol illustrates in figure:
1. bottom ring wall plate, 2. second circle sidings, 3. third circle sidings, 4. annular slabs.
Specific embodiment
As shown in Fig. 2-Fig. 3 A, before present invention installation, first prefabricated several piece bottom ring wall plate, when installation, by several piece bottom ring wall plate 1
It is positioned on annular slab 4, and forms circumferential one and enclose；Bottom ring wall plate 1 in several piece siding is long are as follows: 12885mm；1 piece of foundation ring wall
Plate 1 is long are as follows: 7731mm；2 pieces of bottom ring wall plates 1 are long are as follows: 6443mm and 1 piece of bottom ring wall plate 1 is long are as follows: 5154mm, all bottom ring wall plates 1
Width is equal are as follows: 3191mm；Thickness is equal are as follows: the rectangular steel plates of 30.5mm；And according to design drawing and the prefabricated specifications of steel plate, complete
Seam groove, the machining of U-type groove and the pre-bending of siding of all bottom ring wall plates 1.Then, the prefabricated several piece shape of difference and foundation ring
Siding 1 identical second encloses siding 2, third circle siding 3 to the 11st encloses siding, and width is equal are as follows: 3191mm, length: second
Circle siding 2 and third circle siding 3 are that 12885mm, the 4th circle siding and the 5th circle siding are 12884mm, the 6th circle siding
To the 8th circle siding be 12883mm, the 9th circle siding to the 11st circle siding be 12882mm thickness be respectively as follows: 28.6mm,
The rectangular steel plates of 26.4mm, 24mm, 21.6mm, 18.8mm, 16mm, 13mm, 10mm, 10mm, 10mm；Equally, according to design drawing
Paper and the prefabricated specifications of steel plate complete the machine of the seam groove of all second circle sidings 2, third circle siding 3 and other circle sidings
Processing and pre-bending；Then, siding is successively installed upwards.When installation, 1 block-by-block of several piece bottom ring wall plate is installed according to design drawing
Positioning forms circumferential one and encloses, and after completing the vertical weld seam welding of bottom ring wall plate, then carries out bottom ring wall plate 1 and connect with annular slab 4
The welding at place, in order to control the welding deformation of annular slab 4.
The concave slot matched and U-type groove, and prefabricated list are respectively equipped at above-mentioned bottom ring wall plate 1 and 4 connecting pin of annular slab
50 ° of side groove or not prefabricated groove；It and is gapless group pair between bottom ring wall plate 1 and annular slab 4.
Above-mentioned bottom ring wall plate 1, second enclose siding 2, third circle siding 3, other circle sidings, annular slab 4 material be 9%
Nickel steel.
The present invention uses following installation steps:
Annular slab 4 is arranged in bottom the first step；Then, then by 1 block-by-block of several piece bottom ring wall plate lift in place, wherein bottom
1 outside of circle siding cannot be less than 50mm at a distance from 4 outer rim of annular slab；Adjustment and the measurement verticality of bottom ring wall plate 1, circularity,
Welding point group must not exceed gap, wrong variable and radius, verticality: 15mm, circularity: between maximum gauge and minimum diameter
Difference must not exceed 31mm, welding point group is to gap: control within the scope of 2-4mm；Wrong skin amount: it must not exceed 2mm；Radius:
Allowable error is ± 30mm.
The T-type seam between bottom ring wall plate 1 and annular slab 4 is fixed using steel fixed block for second step, and complete
After the welding of the vertical weld seam of bottom ring wall plate 1, then the welding of the seam of bottom ring wall plate 1 and annular slab 4 is carried out, in order to control ring
The welding deformation of shape plate 4；
Third step, installation platform, installation principle: convenient for construction, not influencing the vertical weld seam welding of the second circle siding 2 is
Preferably；
4th step lifts the second circle siding 2 in place according to design drawing, the verticality of adjustment the second circle siding 2, circle
Degree, welding point group are to gap, wrong variable and radius, and installation accuracy is identical as the requirement of the above-mentioned first step, and to circumferential seam
It is rigidly fixed.
5th step encloses 2 groups of siding to rear, the construction door opening of dismounting first lap siding 1 in completion second according to design drawing
Plate, and complete the reinforcing at door opening；
6th step lifts third circle siding 3 in place according to design installation drawing, adjusts the installation such as its verticality, circularity
Size is rigidly fixed again after positioning, installation platform, then, completes the welding of vertical weld seam, third circle siding 3 is complete
After portion is in place, circumferential seam between third circle siding 3 and the second circle siding 2 is welded.
7th step repeats the 6th step until completing the installation of the 4th circle to the 11st circle siding.
It completes pump in storage tank, in storage tank after all storage tanks inner member installation such as ladder, then is carrying out above-mentioned steps five
The installation of door opening plate, and one is formed by the closed storage tank of siding wall.
In the installation process of siding, while controlling each circle siding verticality, it is necessary to assure storage tank overall vertical degree
Error be no more than height 1/200 or 50mm, take its smaller value.
8th step after completion bottom ring wall plate 1 is connect with annular slab 4, carries out the liquid soap detection of weld seam, to ensure this connection
Weld seam ne-leakage, air-tightness are good.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, it is all
It is any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the invention, still falls within
In the range of technical solution of the present invention.
Claims (7)
1. a kind of LNG tank primary tank bottom ring wall plate and annular slab, it is characterised in that: first prefabricated several piece bottom before installation
Siding is enclosed, when installation, several piece bottom ring wall plate is positioned on annular slab, and forms circumferential one and encloses.
2. LNG tank primary tank bottom ring wall plate according to claim 1 and annular slab, it is characterised in that: described
The concave slot matched and U-type groove, and prefabricated unilateral 50 ° of grooves or not pre- are respectively equipped at bottom ring wall plate and annular slab connecting pin
Groove processed；It and is gapless group pair between bottom ring wall plate and annular slab.
3. LNG tank primary tank bottom ring wall plate according to claim 1 or 2 and annular slab, it is characterised in that:
The material of the bottom ring wall plate, annular slab is 9%Ni steel.
4. a kind of connection method of LNG tank primary tank bottom ring wall plate and annular slab, it is characterised in that: using following
Installation steps:
Annular slab is arranged in bottom the first step；Then, then by several piece bottom ring wall plate block-by-block lift in place, wherein bottom ring wall plate
Outside cannot be less than 50mm at a distance from annular slab outer rim；
T-type seam between bottom ring wall plate and annular slab is fixed second step, and completes the vertical weld seam weldering of bottom ring wall plate
After connecing, then the welding of the seam of bottom ring wall plate and annular slab is carried out, in order to control the welding deformation of annular slab；
Third step, installation platform；
4th step, the second circle siding lifting is in place, and circumferential seam is rigidly fixed；
5th step encloses siding group to rear, the construction door opening plate of dismounting first lap siding in completion second, and completes adding at door opening
Gu；
Third circle siding is lifted in place, after positioning, then is rigidly fixed, installation platform by the 6th step, then, is completed
The welding of vertical weld seam welds circumferential seam between third circle siding and the second circle siding after third circle siding is all in place；
7th step repeats the 6th step until completing the installation of all sidings below, and forms one by the closed storage tank of siding wall；
8th step after completion bottom ring wall plate is connect with annular slab, carries out the liquid soap detection of weld seam, to ensure attachment weld without infiltration
Leakage, air-tightness are good.
5. the connection method of LNG tank primary tank bottom ring wall plate and annular slab according to claim 4, special
Sign is: in the first step, the verticality of bottom ring wall plate must not exceed 15mm；Circularity: between maximum gauge and minimum diameter
Difference must not exceed 31mm；Welding point group controls within the scope of 2-4mm gap；Wrong skin amount must not exceed 2mm；Radius allows
Error is ± 30mm.
6. the connection method of LNG tank primary tank bottom ring wall plate and annular slab according to claim 4, special
Sign is: in the second step, the T-type seam fixation between bottom ring wall plate and annular slab is using steel fixed block.
7. the connection method of LNG tank primary tank bottom ring wall plate and annular slab according to claim 4, special
Sign is: in the 7th step, after completing the installation of storage tank inner member, then carrying out the installation of hole plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910207032.1A CN109854050B (en) | 2019-03-18 | 2019-03-18 | Method for connecting bottom ring wall plate and annular plate of main container of liquefied natural gas storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910207032.1A CN109854050B (en) | 2019-03-18 | 2019-03-18 | Method for connecting bottom ring wall plate and annular plate of main container of liquefied natural gas storage tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109854050A true CN109854050A (en) | 2019-06-07 |
| CN109854050B CN109854050B (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910207032.1A Active CN109854050B (en) | 2019-03-18 | 2019-03-18 | Method for connecting bottom ring wall plate and annular plate of main container of liquefied natural gas storage tank |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201395365Y (en) * | 2009-04-08 | 2010-02-03 | 大庆油田有限责任公司 | Large fillet weld connector used between tank bottom edge board and foundation ring wallboard of 150 thousand m<3> storage tank |
| CN102051991A (en) * | 2009-11-05 | 2011-05-11 | 韩国Gas公社 | Unit-wall structure for liquefied gas storage tank on land |
| CN103758387A (en) * | 2014-02-19 | 2014-04-30 | 中国海洋石油总公司 | Mounting method of liquefied natural gas storage tank wall plates |
| CN105526493A (en) * | 2014-09-29 | 2016-04-27 | 宝山钢铁股份有限公司 | 9Ni steel plate for inner tank wall of large liquefied natural gas storage tank, manufacturing method for 9Ni steel plate and tank wall structure |
| JP2018059300A (en) * | 2016-10-04 | 2018-04-12 | 株式会社Ihi | Construction method of tank |
| CN207535415U (en) * | 2017-10-12 | 2018-06-26 | 钢铁研究总院 | It is a kind of for the symmetrical assembly of the titanium steel composite board rolled entirely |
-
2019
- 2019-03-18 CN CN201910207032.1A patent/CN109854050B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201395365Y (en) * | 2009-04-08 | 2010-02-03 | 大庆油田有限责任公司 | Large fillet weld connector used between tank bottom edge board and foundation ring wallboard of 150 thousand m<3> storage tank |
| CN102051991A (en) * | 2009-11-05 | 2011-05-11 | 韩国Gas公社 | Unit-wall structure for liquefied gas storage tank on land |
| CN103758387A (en) * | 2014-02-19 | 2014-04-30 | 中国海洋石油总公司 | Mounting method of liquefied natural gas storage tank wall plates |
| CN105526493A (en) * | 2014-09-29 | 2016-04-27 | 宝山钢铁股份有限公司 | 9Ni steel plate for inner tank wall of large liquefied natural gas storage tank, manufacturing method for 9Ni steel plate and tank wall structure |
| JP2018059300A (en) * | 2016-10-04 | 2018-04-12 | 株式会社Ihi | Construction method of tank |
| CN207535415U (en) * | 2017-10-12 | 2018-06-26 | 钢铁研究总院 | It is a kind of for the symmetrical assembly of the titanium steel composite board rolled entirely |
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| CN109854050B (en) | 2021-08-31 |
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