CN114922490A - LNG storage tank outer tank dome concrete pressure-maintaining pouring construction optimization method - Google Patents
LNG storage tank outer tank dome concrete pressure-maintaining pouring construction optimization method Download PDFInfo
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- CN114922490A CN114922490A CN202210740292.7A CN202210740292A CN114922490A CN 114922490 A CN114922490 A CN 114922490A CN 202210740292 A CN202210740292 A CN 202210740292A CN 114922490 A CN114922490 A CN 114922490A
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- 239000004567 concrete Substances 0.000 title claims abstract description 89
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000003860 storage Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005457 optimization Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 238000012423 maintenance Methods 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 239000002023 wood Substances 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 2
- 238000009415 formwork Methods 0.000 claims 1
- 238000005192 partition Methods 0.000 abstract description 3
- 239000003949 liquefied natural gas Substances 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/18—Containers for fluids or gases; Supports therefor mainly of concrete, e.g. reinforced concrete, or other stone-like material
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/04—Containers for fluids or gases; Supports therefor mainly of metal
- E04H7/06—Containers for fluids or gases; Supports therefor mainly of metal with vertical axis
- E04H7/065—Containers for fluids or gases; Supports therefor mainly of metal with vertical axis roof constructions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention belongs to the field of constructional engineering, and provides an optimization method for concrete pressure-maintaining pouring construction of an outer tank dome of an LNG storage tank, which comprises the following steps: s1, mounting a dome-shaped steel latticed shell structure; s2, pressurizing in the tank; s3, pouring dome concrete in a partition mode, and dividing the dome concrete into a plurality of annular areas B from outside to inside i (i-1, … …, j, j ≧ 4), an annular region B at the edge of the dome 1 For the 1 st circle of concrete pouring, an annular area B is positioned in the center of the dome i Pouring concrete for the ith circle; and S4, carrying out maintenance work, when the strength maintenance of the concrete of the whole dome reaches 80% of the designed strength, carrying out pressure relief in the tank, and finishing pressure maintaining. The invention adopts a construction method for maintaining pressure in the tank body and circulating and non-layering pouring of dome concrete, which not only solves the problem of overlarge concrete pouring pressure,and the appearance of construction joints is avoided, the integrity of a dome concrete structure is improved, the seismic performance of the structure is enhanced, the construction progress is greatly accelerated, and the cost is saved.
Description
Technical Field
The invention belongs to the field of constructional engineering, and relates to an optimization method for concrete pressure-maintaining pouring construction of an outer tank dome of an LNG storage tank.
Technical Field
Liquefied Natural Gas (LNG) is clean energy which is obtained by cooling conventional natural gas to below 160 ℃ below zero under normal pressure through a low-temperature liquefaction process and separating a large amount of pollution elements such as sulfur, phosphorus and the like, and takes methane as a main component. In the LNG industry chain, safe storage is one of the key links. The LNG full-capacity storage tank is a core storage facility in an LNG industrial chain, and has the advantages of large investment, dense technology and high safety requirement. At present, the main structure of the conventional LNG full-capacity storage tank comprises a foundation, a bearing platform, a dome, an outer tank, an inner tank and other structural parts. Wherein, cushion cap and dome are reinforced concrete structure.
The dome structure is used as a main structural member of the storage tank, upper process equipment and a bearing member of an auxiliary structure, has the characteristics of high risk in a construction stage and complex structural stress, and must pay attention to design and construction processes. At present, dome concrete of liquefied natural gas storage tanks built nationwide is mostly poured by layers. The construction method is long in construction period, and one construction joint is artificially added by layered pouring, so that the integrity of the concrete structure is damaged, and the seismic performance of the structure is reduced.
Disclosure of Invention
Aiming at the technical problems, the invention provides an optimization method for the pressure-maintaining pouring construction of the dome concrete of the outer tank of the LNG storage tank, which adopts a construction method for maintaining the pressure inside the tank body and pouring the dome concrete in circles without layering by optimizing the construction method, thereby not only solving the problem of overlarge pressure of the concrete pouring, but also avoiding the occurrence of construction joints, increasing the integrity of the dome concrete structure, enhancing the anti-seismic performance of the structure, simultaneously greatly accelerating the construction progress and saving the cost;
the technical scheme comprises the following steps:
s1, mounting a dome-shaped steel latticed shell structure;
s2, pressurizing the tank;
s3, pouring dome concrete in a partition mode, and dividing the dome concrete into a plurality of annular areas B from outside to inside i (i 1, … …, j ≧ 4), and an annular region B located at the edge of the dome 1 An annular area B in the center of the dome for the 1 st circle of concrete pouring i Pouring concrete for the ith circle;
and S4, carrying out maintenance work, and when the strength maintenance of the concrete of the whole dome reaches 80% of the designed strength, carrying out pressure relief in the tank, and finishing pressure maintaining.
Further, step S1 includes the following steps;
s1.1, measuring and paying off;
s1.2, binding dome reinforcing steel bars;
s1.3, installing an embedded part;
and S1.4, installing a non-dismantling template.
Further, step S2 includes driving system, driving system includes 2 air compressors and generator, 2 air compressors use the temporary electricity as the main power supply, and 2 air compressors access the generator.
Furthermore, the power system further comprises a U-shaped pressure gauge, and two ends of the U-shaped pressure gauge are respectively positioned inside and outside the storage tank.
Furthermore, the power system also comprises an automatic pressure regulating system, wherein the automatic pressure regulating system comprises an air compressor valve, the air inflow is controlled through the air compressor valve, and when the pressure maintaining pressure is lower than a standard value by 5mm of water column, the air compressor valve is opened for pressure compensation; and when the pressure reaches the standard pressure, closing the valve of the air compressor to stop pressure compensation.
Further, step S3 includes pouring concrete in circles 1, 2, and 3, reducing the slump of the concrete in a slump range meeting the requirements of 160 ± 40mm and under the pumping requirements, distributing the concrete twice in an area with a thickness of more than 400mm, completing the second distribution, vibrating after 10-15 minutes, and timely cleaning the flowing concrete.
Further, step S3 includes maintaining the pressure when the air pressure reaches 10-11KPa, starting to perform concrete pouring for the 1 st circle, wherein the air pressure should not be lower than 10KPa during the concrete pouring for the 1 st circle to the 3 rd circle, and before performing concrete pouring for the 4 th circle, the air pressure in the tank should be kept unchanged until the concrete for the ith circle is poured.
Further, step S4 includes leveling the concrete with a modeling wood scraper before initial setting, leveling and compacting with a polishing machine and a wood trowel after initial setting, and then performing manual surface rolling and polishing for 2 times.
Has the advantages that:
1. according to the construction method, the construction method is optimized, the pressure inside the tank body is maintained, and the dome concrete is cast in circles without layering, so that the problem of overlarge concrete casting pressure is solved, construction joints are avoided, the integrity of the dome concrete structure is improved, the anti-seismic performance of the structure is enhanced, the construction progress is greatly accelerated, and the cost is saved.
2. According to the invention, through the arrangement of 2 air compressors and 2 generators, the pressure in the tank can be quickly increased, and meanwhile, the influence of power failure in power supply to pressure maintaining can be prevented; the pressure value in the storage tank can be monitored by combining the arrangement of the U-shaped pressure gauge; through the setting of automatic pressure regulating system, can automatically regulated jar internal pressure, ensure that pressure is in reasonable scope.
3. Before initial setting, the concrete is leveled by a modeling wood scraper, flattened and compacted by a polishing machine and a wood trowel after initial setting, and then manually rolled and calendered for 2 times, so that the early shrinkage crack of the concrete can be effectively prevented.
Drawings
FIG. 1 is a flow diagram of the overall process of the present invention.
FIG. 2 is a process flow diagram of step S1 of the present invention.
FIG. 3 is a schematic view of the whole structure of the pressure maintaining construction of the present invention.
FIG. 4 is a schematic diagram of the power system configuration of the present invention.
Fig. 5 is a top view of the present invention dome concrete partition casting structure.
In the drawings: 1. a section steel reticulated shell structure; 2. dome concrete; 3. a power system; 31. an air compressor; 32. a generator; 33. a U-shaped pressure gauge; 34. an automatic pressure regulating system; 4. and (5) applying electricity.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 scope of protection of the present invention.
As shown in FIG. 3, the invention is a 20-cubic tank and a corresponding process treatment system, and the dome area of the tank is about 4360m 2 The steel bar protection layer at the bottom is 40mm, the steel bar protection layer at the top is 50mm, the inner diameter of the dome is 88m, the chord height is 10.226m, the relative elevation of the top of the dome is +54.29m, the concrete dome structure is a spherical shell structure, and the concrete 2 amount of each dome is about 4200m 3 The steel bars are about 1300t, and the LNG storage tank dome is made of CF50 fiber concrete (high-extension high-strength composite crack-resistant fiber is doped in the LNG storage tank dome, and the doping amount is 1.0-1.2 KG/m 3 And the length is 16-19 mm).
The invention provides an LNG storage tank outer tank dome concrete pressure-maintaining pouring construction optimization method, as shown in figures 1, 2 and 3, the method comprises the following steps:
s1, mounting the dome-shaped steel latticed shell structure 1;
s1.1, measuring and paying off;
s1.2, binding dome reinforcing steel bars;
s1.3, installing an embedded part;
s1.4, installing a non-dismantling template;
s2, pressurizing in the tank;
s3, pouring the dome concrete 2 in a subarea mode, and dividing the dome concrete 2 into a plurality of annular areas B from outside to inside i (i-1, … …, j, j ≧ 4), an annular region B at the edge of the dome 1 For the 1 st circle of concrete pouring, an annular area B is positioned in the center of the dome i Pouring concrete for the ith circle; the slump of concrete is controlled in the construction process, the flow drop is reduced, and meanwhile, the material is distributed symmetrically at a constant speed, so that the dome is prevented from being stressed unevenly;
and S4, carrying out maintenance work, and when the strength maintenance of the whole dome concrete 2 reaches 80% of the designed strength, carrying out pressure relief in the tank, and finishing pressure maintaining.
In the embodiment, by optimizing the construction method, the construction method is adopted, the pressure is maintained in the tank body, and the dome concrete 2 is cast in circles without layering, so that the problem of overlarge concrete casting pressure is solved, the construction joints are avoided, the structural integrity of the dome concrete 2 is improved, the anti-seismic performance of the structure is enhanced, the construction progress is greatly accelerated, and the cost is saved.
As shown in fig. 1 and 4, preferably, step S2 includes a power system 3, where the power system 3 includes 2 air compressors 31, a generator 32, a U-shaped pressure gauge 33, and an automatic pressure regulating system 34, where the 2 air compressors 31 use a temporary power source 4 as a main power source, the 2 air compressors 31 are connected to the generator 32, two ends of the U-shaped pressure gauge 33 are respectively located inside and outside the storage tank, the automatic pressure regulating system 34 includes an air compressor valve, air intake is controlled by the air compressor valve, and when the pressure maintaining pressure is lower than a standard value of 5mm water column, the air compressor valve is opened to supplement the pressure; and when the pressure reaches the standard pressure, closing the valve of the air compressor to stop pressure compensation.
In the embodiment, through the arrangement of 2 air compressors 31 and 2 generators 32, the pressure in the tank can be quickly increased, and meanwhile, the influence on pressure maintaining caused by power failure of the temporary power supply 4 can be prevented; the pressure value in the storage tank can be monitored by combining the arrangement of the U-shaped pressure gauge 33; through the setting of automatic pressure regulating system 34, can automatically regulated jar internal pressure, ensure that pressure is in reasonable scope.
As shown in fig. 1, 3 and 5, preferably, the step S3 includes maintaining the pressure when the air pressure reaches 10-11KPa, starting to perform concrete pouring for the 1 st circle, wherein the air pressure is not lower than 10KPa in the concrete pouring processes for the 1 st circle to the 3 rd circle, and before performing concrete pouring for the 4 th circle, the air pressure in the tank should be kept unchanged until the concrete for the ith circle is poured; and (3) performing concrete pouring in circles 1, 2 and 3, reducing the concrete slump in a slump range meeting the requirement of 160 +/-40 mm and the pumping requirement, distributing the concrete twice in an area with the thickness of more than 400mm, finishing the distribution for the second time, vibrating after 10-15 minutes to reduce the concrete flowing phenomenon, and timely cleaning the flowing concrete to avoid polluting the appearance quality of the finished concrete.
As shown in fig. 1 and 3, preferably, step S4 includes leveling the concrete with a modeling wood scraper before initial setting, leveling and compacting the concrete with a polishing machine and a wood trowel after initial setting, and then performing manual surface rolling for 2 times, so as to effectively prevent early shrinkage cracks of the concrete.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The LNG storage tank outer tank dome concrete pressure maintaining pouring construction optimization method is characterized by comprising the following steps:
s1, mounting a dome-shaped steel latticed shell structure (1);
s2, pressurizing in the tank;
s3, pouring dome concrete (2) in a subarea mode, and dividing the dome concrete (2) into a plurality of annular areas B from outside to inside i (i 1, … …, j ≧ 4), and an annular region B located at the edge of the dome 1 An annular area B in the center of the dome for the 1 st circle of concrete pouring i Pouring concrete for the ith circle;
and S4, carrying out maintenance work, and when the strength maintenance of the whole dome concrete (2) reaches 80% of the designed strength, carrying out pressure relief in the tank, and finishing the pressure maintaining.
2. The LNG storage tank outer tank dome concrete pressure-maintaining pouring construction optimization method according to claim 1, wherein the step S1 includes the following steps;
s1.1, measuring and paying off;
s1.2, binding dome reinforcing steel bars;
s1.3, installing an embedded part;
s1.4, installing the non-dismantling formwork.
3. The LNG storage tank outer tank dome concrete pressure maintaining pouring construction optimization method is characterized in that step S2 comprises a power system (3), the power system (3) comprises 2 air compressors (31) and generators (32), the 2 air compressors (31) use temporary power supply (4) as a main power supply, and the 2 air compressors (31) are connected to the generators (32).
4. The optimization method for concrete pressure-maintaining pouring construction of the outer tank dome of the LNG storage tank is characterized in that the power system (3) further comprises a U-shaped pressure gauge (33), and two ends of the U-shaped pressure gauge (33) are respectively positioned inside and outside the storage tank.
5. The LNG storage tank outer tank dome concrete pressure maintaining pouring construction optimization method is characterized in that the power system (3) further comprises an automatic pressure regulating system (34), the automatic pressure regulating system (34) comprises an air compressor valve, air inflow is controlled through the air compressor valve, and when the pressure maintaining pressure is lower than a standard value by 5mm of water column, the air compressor valve is opened to supplement pressure; and when the pressure reaches the standard pressure, closing the valve of the air compressor to stop pressure compensation.
6. The LNG storage tank outer tank dome concrete pressure maintaining pouring construction optimization method according to claim 1, characterized in that step S3 includes pouring concrete for the 1 st, 2 nd and 3 rd circles, reducing concrete slump in a slump range meeting 160 +/-40 mm requirements and pumping requirements, distributing the concrete twice for an area with the concrete thickness being larger than 400mm, completing the second distribution, vibrating after 10-15 minutes, and timely cleaning the flowing concrete.
7. The method for optimizing the concrete pressure-maintaining pouring construction of the external tank dome of the LNG storage tank as claimed in claim 1 or 6, wherein the step S3 comprises maintaining the pressure when the air pressure reaches 10-11KPa, starting to perform the 1 st circle of concrete pouring, keeping the air pressure in the tank unchanged until the ith circle of concrete is poured, wherein the air pressure is not lower than 10KPa during the 1 st to 3 rd circles of concrete pouring, and the air pressure in the tank is kept unchanged before the 4 th circle of concrete pouring.
8. The method for optimizing the concrete pressure maintaining pouring construction of the outer tank dome of the LNG storage tank as claimed in claim 1, wherein step S4 includes leveling the concrete with a modeling wood scraper before initial setting, leveling and compacting the concrete with a polishing machine and a wood trowel after initial setting, and then performing press polishing 2 times with a manual surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210740292.7A CN114922490A (en) | 2022-06-27 | 2022-06-27 | LNG storage tank outer tank dome concrete pressure-maintaining pouring construction optimization method |
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| CN202210740292.7A CN114922490A (en) | 2022-06-27 | 2022-06-27 | LNG storage tank outer tank dome concrete pressure-maintaining pouring construction optimization method |
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|---|---|---|---|---|
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| JP2008115614A (en) * | 2006-11-06 | 2008-05-22 | Ohbayashi Corp | Construction method for concrete roof |
| JP2014193726A (en) * | 2013-03-28 | 2014-10-09 | Osaka Gas Co Ltd | Gas storage tank |
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| CN110043095A (en) * | 2019-04-23 | 2019-07-23 | 中海石油气电集团有限责任公司 | Storage tank internal classification pressurization holding pressure control method and LNG storage tank during dome pours |
| CN110195514A (en) * | 2018-02-26 | 2019-09-03 | 中国核工业第五建设有限公司 | A kind of segment-shaped dome concreting method |
| CN110761469A (en) * | 2019-10-29 | 2020-02-07 | 中海石油气电集团有限责任公司 | Layered and annular pouring control method for pressure-maintaining dome concrete in LNG storage tank stage |
| CN210067580U (en) * | 2019-04-23 | 2020-02-14 | 中海石油气电集团有限责任公司 | LNG storage tank |
| CN211115078U (en) * | 2019-10-29 | 2020-07-28 | 中海石油气电集团有限责任公司 | L NG storage tank stage pressure maintaining dome |
-
2022
- 2022-06-27 CN CN202210740292.7A patent/CN114922490A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0533523A (en) * | 1991-07-30 | 1993-02-09 | Ishii Iron Works Co Ltd | Method for constructing concrete domed roof and membrane structure used therein |
| JP2000248774A (en) * | 1999-02-26 | 2000-09-12 | Ishikawajima Harima Heavy Ind Co Ltd | Concrete roof construction method for concrete tank |
| JP2008115614A (en) * | 2006-11-06 | 2008-05-22 | Ohbayashi Corp | Construction method for concrete roof |
| JP2014193726A (en) * | 2013-03-28 | 2014-10-09 | Osaka Gas Co Ltd | Gas storage tank |
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| CN110043095A (en) * | 2019-04-23 | 2019-07-23 | 中海石油气电集团有限责任公司 | Storage tank internal classification pressurization holding pressure control method and LNG storage tank during dome pours |
| CN210067580U (en) * | 2019-04-23 | 2020-02-14 | 中海石油气电集团有限责任公司 | LNG storage tank |
| CN110761469A (en) * | 2019-10-29 | 2020-02-07 | 中海石油气电集团有限责任公司 | Layered and annular pouring control method for pressure-maintaining dome concrete in LNG storage tank stage |
| CN211115078U (en) * | 2019-10-29 | 2020-07-28 | 中海石油气电集团有限责任公司 | L NG storage tank stage pressure maintaining dome |
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Application publication date: 20220819 |
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