CN117108909B - Construction method of underground LNG storage tank - Google Patents
Construction method of underground LNG storage tank Download PDFInfo
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- CN117108909B CN117108909B CN202311348587.0A CN202311348587A CN117108909B CN 117108909 B CN117108909 B CN 117108909B CN 202311348587 A CN202311348587 A CN 202311348587A CN 117108909 B CN117108909 B CN 117108909B
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- 238000010276 construction Methods 0.000 title claims abstract description 39
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 27
- 239000012774 insulation material Substances 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 238000010008 shearing Methods 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 12
- 229920002396 Polyurea Polymers 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 11
- 239000004567 concrete Substances 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 11
- 229920001971 elastomer Polymers 0.000 claims description 10
- 238000009415 formwork Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- 235000019362 perlite Nutrition 0.000 claims description 5
- 239000010451 perlite Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 abstract 1
- 239000003949 liquefied natural gas Substances 0.000 description 29
- 230000000694 effects Effects 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003063 flame retardant Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- F17C3/00—Vessels not under pressure
- F17C3/005—Underground or underwater containers or vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
-
- 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
-
- 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
- F17C3/00—Vessels not under pressure
-
- 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
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/01—Reinforcing or suspension means
- F17C2203/011—Reinforcing means
-
- 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
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/01—Mounting arrangements
- F17C2205/0103—Exterior arrangements
-
- 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
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/01—Mounting arrangements
- F17C2205/0153—Details of mounting arrangements
- F17C2205/0196—Details of mounting arrangements with shock absorbing means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a construction method of an underground LNG storage tank, which comprises the steps of underground buried groove excavation construction, reinforced concrete carrier construction, outer tank body template construction, inner tank body construction, inner dome plate construction, outer dome template construction, cold insulation material construction, outer tank body and outer dome plate integrated pouring construction.
Description
Technical Field
The invention relates to the technical field of LNG storage tank construction, in particular to a construction method of an underground LNG storage tank.
Background
Liquefied natural gas (LNG for short) mainly contains methane, is recognized as the cleanest fossil energy source on the earth, is colorless, odorless, nontoxic and noncorrosive, has a volume of about 1/625 of the volume of the same amount of gaseous natural gas, and has the mass of only about 45% of the water in the same volume; and the liquefied natural gas is liquid after being compressed and cooled to the boiling point (-161.5 ℃) temperature, and is usually stored in a low-temperature storage tank with the temperature of-161.5 ℃ and the pressure of about 0.1 MPa.
At present, the technology and development of underground LNG storage tanks in China are deficient due to the condition constraint in the aspects of economy, technology and the like; compared with an overground storage tank, the stability and the safety of the overground storage tank are important to prevent secondary disasters caused by sedimentation, inclination and instability of the storage tank, the underground LNG storage tank has the advantages of better shock resistance and safety, small possibility of being collided by an object in the air, small influence of wind load, small influence of leakage and the like, and the underground LNG storage tank is the direction of energy storage in China and needs to perform related technology attack and storage.
In the construction of an underground LNG storage tank in the prior art, cold insulation materials are directly filled between an inner tank body and the inner wall of an underground buried tank, the ground is a huge thermostat body, the underground LNG storage tank has huge heat capacity, the annual temperature is not more than 20-30 ℃, the underground LNG storage tank is equivalent to a huge constant-temperature conductor, and the influence of the external environment temperature on liquefied natural gas in the inner tank body is reduced by using cold insulation and the ground as a heat insulation layer, so that the cold insulation temperature balance of the inner tank body is realized; however, in the actual construction process, the inner tank body is easy to generate sedimentation phenomenon due to vibration action, so that the problem of sedimentation of the filled cold insulation material is caused, the cold insulation effect of the inner tank body is seriously influenced, and the construction application of the underground LNG storage tank is limited.
Disclosure of Invention
The invention aims to provide a construction method of an underground LNG storage tank, which is used for solving the problem that an inner tank body is easy to be subjected to vibration to generate sedimentation phenomenon, so that the problem that a filled cold insulation material is sedimentated along with the inner tank body is solved.
The aim of the invention can be achieved by the following technical scheme:
a method of constructing an underground LNG storage tank, comprising the steps of:
firstly, excavating an underground buried groove for construction, arranging a shearing mechanism on the inner annular wall of the underground buried groove, and uniformly burying a plurality of column piles on the inner bottom wall of the underground buried groove;
step two, constructing a reinforced concrete carrier, namely installing rubber supports on a plurality of column piles, and hoisting the prefabricated reinforced concrete carrier to the rubber supports for installation;
step three, constructing an outer tank template, namely arranging an outer support template in an underground buried groove in a layered manner from bottom to top, enclosing an annular cavity between the outer support template and the underground buried groove, and integrally welding the outer support template with a reinforced concrete carrier and a shear mechanism respectively;
fourthly, constructing an inner tank body, namely integrally welding the inner tank body and the reinforced concrete carrier, and enclosing a cold insulation cavity between the inner tank body and the outer support template;
fifthly, constructing an inner dome plate, wherein the top opening end of the inner tank body is connected with the inner dome plate in a sealing manner;
step six, constructing an outer dome template, wherein the top opening end of the outer dome template is connected with the outer dome support plate in a sealing way;
step seven, constructing a cold insulation material, namely filling the cold insulation material between the outer support template and the inner tank body through an opening on the outer dome support plate;
and eighth, the outer tank body and the outer dome plate are integrally cast, and a sealing template is arranged at the top opening end of the underground buried groove, so that concrete is integrally cast and formed along the outline of the outer dome support plate and the outline of the outer support template.
As a further scheme of the invention: in the first step, the shearing mechanism is a plurality of shearing steel bars, the plurality of shearing steel bars are driven into the inner annular wall of the underground buried groove, and polyurea is sprayed on the inner annular wall of the underground buried groove for construction.
As a further scheme of the invention: and the shearing force reinforcing steel bars are integrally welded with the layered outer support templates.
As a further scheme of the invention: and in the second step, a plurality of first embedded ribs, second embedded ribs and third embedded ribs are embedded in the reinforced concrete carrier, the first embedded ribs extend into an annular cavity between the outer support template and the underground embedded groove, the second embedded ribs are welded with the outer support template integrally, and the third embedded ribs are welded with the inner tank integrally.
As a further scheme of the invention: and step four, the outer annular wall of the inner tank body is sleeved with an elastic felt.
As a further scheme of the invention: and fifthly, an inner connecting part is integrally welded at the sealing joint of the inner tank body and the inner dome plate, the inner connecting part comprises a sealing ring and a compression-resistant ring, the sealing ring is integrally welded with the inner tank body, and the compression-resistant ring is integrally welded with the inner dome plate.
As a further scheme of the invention: and in the fifth step, a plurality of suspended ceiling steel bars are vertically connected to the inner dome plate, the suspended ceiling steel bars are used for penetrating through the outer dome support plate and extend upwards, and the suspended ceiling steel bars are integrally welded with the outer dome support plate respectively.
As a further scheme of the invention: and step six, an outer connecting part is arranged at the sealing joint of the outer supporting template and the outer dome supporting plate, the outer connecting part comprises a sealing ring and a compression-resistant ring, the sealing ring is integrally welded with the outer supporting template, and the compression-resistant ring is integrally welded with the outer dome supporting plate.
As a further scheme of the invention: and in the seventh step, the cold-preserving material is expanded perlite micropowder.
As a further scheme of the invention: and eighth, spraying polyurea on the outer leakage surface of the outer dome plate integrally formed in a building mode.
The invention has the beneficial effects that:
the outer tank concrete pouring concrete, the outer support templates, the cold insulation materials and the elastic felt are arranged between the inner tank and the underground buried tank, the cold insulation materials are arranged in the outer support templates and the fixed cavities of the inner tank, the problem that the cold insulation materials are settled can be avoided, and the built underground LNG storage tank has good cold insulation effect;
the reinforced concrete carrier is installed in the underground buried groove through the plurality of column piles and the rubber support, the plurality of column piles have good capability of bearing vertical load, the phenomenon of uneven settlement of the reinforced concrete carrier can be prevented, the provided rubber support has good shock resistance, and the reinforced concrete carrier foundation can be suitable for areas with poor engineering geological conditions;
the shear mechanism is inserted on the inner annular wall of the underground buried tank, and the first embedded ribs are arranged on the reinforced concrete carrier, so that the cast concrete of the outer tank body has high cast connection strength under the action of horizontal and vertical shear force, and the integral sedimentation of the underground LNG storage tank can be avoided;
the construction of spraying polyurea on the inner annular wall of the underground buried groove and the construction of spraying polyurea on the outer leakage surface of the outer dome plate formed by integral building are adopted, so that the spraying polyurea has good waterproof performance and durability, and meanwhile, has certain flame retardant property, and is used for protecting the underground LNG storage tank.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of an underground LNG tank of the present invention;
FIG. 2 is a schematic illustration of an underground buried tank of an underground LNG storage tank of the present invention;
FIG. 3 is a schematic view of a reinforced concrete carrier disposed in an underground buried tank of an underground LNG storage tank of the present invention;
FIG. 4 is a schematic illustration of an outer formwork and inner tank arrangement of an underground LNG storage tank of the present invention;
FIG. 5 is a schematic illustration of the connection of the inner tank body and inner dome plate of an underground LNG storage tank of the present invention;
fig. 6 is a schematic view of the inner dome plate and outer dome support plate construction of an underground LNG storage tank of the present invention.
In the figure: 1. underground buried grooves; 2. a reinforced concrete carrier; 20. embedding ribs I; 21. embedding ribs II; 22. pre-buried ribs III; 3. a rubber support; 4. a column pile; 5. an outer formwork; 6. shear steel bars; 7. an inner tank; 8. an inner dome plate; 9. suspended ceiling steel bars; 10. an outer dome support plate; 11. expanded perlite micropowder; 12. an elastic felt; 13. an outer connection portion; 14. an inner connecting part; 15. a seal ring; 16. and (3) resisting the compression ring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention; in the description of the present invention, the meaning of "a plurality", "a number" or "a plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
Referring to fig. 1-6, the present invention is a method for constructing an underground LNG storage tank, comprising the steps of:
step one, excavating an underground buried groove 1 for construction, arranging shear mechanisms on the inner annular wall of the underground buried groove 1, uniformly burying a plurality of column piles 4 on the inner bottom wall of the underground buried groove 1, wherein the arranged shear mechanisms are used for reinforcing horizontal shear force between concrete of an outer tank building, so that the concrete of the outer tank building can be prevented from settling, a plurality of column piles 4 can penetrate through a weak layer of a substrate of the underground buried groove 1, so that the column piles can conveniently extend into a deeper bearing layer, the capacity of bearing vertical loads of the column piles 4 is good, and the phenomenon of uneven settlement of a reinforced concrete carrier 2 can be prevented.
In the technical step, the shearing mechanism is a plurality of shearing steel bars 6, the plurality of shearing steel bars 6 are driven into the inner annular wall of the underground buried groove 1, the operation and construction of the shearing steel bars 6 are convenient, after the construction of the plurality of shearing steel bars 6 is completed, the construction of spraying polyurea on the inner annular wall of the underground buried groove 1 is carried out, and the spraying polyurea enables the inner annular wall of the underground buried groove 1 to have good waterproof performance and durability, and meanwhile has certain flame retardant property, and is used for protecting and applying an underground LNG storage tank.
Step two, construction of the reinforced concrete carrier 2, namely installing the rubber support 3 on a plurality of column piles 4, lifting the prefabricated reinforced concrete carrier 2 to the rubber support 3 for installation, carrying out load support on the reinforced concrete carrier 2 through a plurality of column piles 4, and setting the rubber support 3 to have better shock resistance, so that the foundation of the reinforced concrete carrier 2 can be suitable for areas with poorer engineering geological conditions.
In the technical step, a plurality of first embedded ribs 20, second embedded ribs 21 and third embedded ribs 22 are embedded in the reinforced concrete carrier 2 in the step two, the first embedded ribs 20 extend into an annular cavity between the outer support template 5 and the underground buried groove 1, the first embedded ribs 20 are used for reinforcing vertical shearing force between concrete of the outer tank building, so that shear force connection between the reinforced concrete carrier 2 and the concrete of the outer tank building is stable and reliable, the second embedded ribs 21 are integrally welded with the outer support template 5 respectively, stable and reliable connection between the reinforced concrete carrier 2 and the outer support template 5 is realized, the third embedded ribs 22 are integrally welded with the inner tank 7 respectively, and the whole settlement of the underground LNG storage tank can be avoided.
Step three, construction of an outer tank template, namely arranging an outer support template 5 in the underground buried groove 1 from bottom to top in a layered manner, enclosing an annular cavity between the outer support template 5 and the underground buried groove 1, wherein concrete materials are convenient to pour in the enclosed annular cavity, and the outer support template 5 is welded with the reinforced concrete carrier 2 and the shear mechanism integrally respectively, so that the outer support template 5 is stable in framework.
And fourthly, constructing an inner tank body 7, namely integrally welding the inner tank body 7 and the reinforced concrete carrier 2, enclosing a cold insulation cavity between the inner tank body 7 and the outer support template 5, wherein cold insulation materials are convenient to fill in the enclosed cold insulation cavity, and the cold insulation materials can be prevented from settling, so that the cold insulation effect of the inner tank body 7 is prevented from being influenced.
In the technical step, the elastic felt 12 is sleeved on the outer annular wall of the inner tank body 7, and the elastic felt 12 has certain elasticity, so that the horizontal pressure of the expanded perlite micropowder 11 on the inner tank body 7 can be reduced.
Step five, construction of an inner dome plate 8, wherein the top opening end of an inner tank body 7 is in sealing connection with the inner dome plate 8, the integral fixing and welding construction is convenient, an inner connecting part 14 is integrally welded at the sealing connection part of the inner tank body 7 and the inner dome plate 8, the inner connecting part 14 comprises a sealing ring 15 and a compression-resistant ring 16, the sealing ring 15 is integrally welded with the inner tank body 7, the compression-resistant ring 16 is integrally welded with the inner dome plate 8, the sealing connection effect between the inner tank body 7 and the inner dome plate 8 is enhanced through the inner connecting part 14, and the welding position is reinforced and protected.
In this technical step, connect a plurality of furred ceiling reinforcing bars 9 perpendicularly on the interior dome board 8, a plurality of furred ceiling reinforcing bars 9 are used for running through outer dome extension board 10 and upwards stretch out, and a plurality of furred ceiling reinforcing bars 9 respectively with outer dome extension board 10 between integrative welding, the furred ceiling reinforcing bar 9 of setting plays and carries out the constraint effect to interior dome board 8, avoids interior dome board 8 to take place to warp because of the inside and outside pressure difference of storage tank.
Step six, outer dome template construction, outer dome extension board 10 of top end sealing connection of outer formwork 5, integrative fixed welding construction convenience, outer formwork 5 and outer dome extension board 10's sealing connection department sets up outer connecting portion 13, outer connecting portion 13 is including sealing ring 15 and anti-compression ring 16, outer formwork 5 is connected in integrative welding to sealing ring 15, outer dome extension board 10 is connected in integrative welding to anti-compression ring 16, strengthen the sealing connection effect between outer formwork 5 and the outer dome extension board 10 through the outer connecting portion 13 that sets up, and strengthen the protection in welding position department.
And seventh, cold insulation material construction, wherein the cold insulation material is filled between the outer support template 5 and the inner tank 7 through the opening on the outer dome support plate 10, and the cold insulation material is expanded perlite micropowder 11, so that the cold insulation material is convenient to set the cold insulation of the inner tank 7 and the inner dome top plate 8, and the cold insulation is uniform.
Step eight, the integrative construction of pouring of outer jar body and outer dome board sets up the sealing template through burying groove 1 top end underground, and along outer dome extension board 10 and outer formwork 5 profile integrative pouring shaping concrete, outer jar body and outer dome board integrative pouring construction convenience, whole sealing performance is better, and the outside surface of outer dome board of integrative building shaping sprays polyurea construction, sprays polyurea makes outer dome board have good waterproof performance, durability, has certain fire retardant property simultaneously for protect the application to underground LNG storage tank.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (10)
1. A method of constructing an underground LNG storage tank, comprising the steps of:
firstly, excavating an underground buried groove (1) for construction, arranging a shearing mechanism on the inner annular wall of the underground buried groove (1), and uniformly burying a plurality of column piles (4) on the inner bottom wall of the underground buried groove (1);
step two, constructing a reinforced concrete carrier (2), namely installing rubber supports (3) on a plurality of column piles (4), and hoisting the prefabricated reinforced concrete carrier (2) to the rubber supports (3) for installation;
step three, constructing an outer tank template, namely layering an outer support template (5) in an underground buried groove (1) from bottom to top, enclosing an annular cavity between the outer support template (5) and the underground buried groove (1), and integrally welding the outer support template (5) with a reinforced concrete carrier (2) and a shearing mechanism respectively;
fourthly, constructing an inner tank body (7), wherein the inner tank body (7) and the reinforced concrete carrier (2) are integrally welded, and a cold insulation cavity is formed between the inner tank body (7) and the outer support template (5);
fifthly, constructing an inner dome plate (8), wherein the top opening end of the inner tank body (7) is connected with the inner dome plate (8) in a sealing way;
step six, constructing an outer dome template, wherein the top opening end of the outer dome template (5) is connected with an outer dome support plate (10) in a sealing way;
step seven, constructing a cold insulation material, namely filling the cold insulation material between the outer support template (5) and the inner tank body (7) through an opening on the outer dome support plate (10);
and eighth, the outer tank body and the outer dome plate are integrally cast, and a sealing template is arranged at the top opening end of the underground buried groove (1), so that concrete is integrally cast and formed along the outline of the outer dome support plate (10) and the outline of the outer support template (5).
2. The method for constructing the underground LNG storage tank according to claim 1, wherein in the first step, the shearing mechanism is a plurality of shearing steel bars (6), the plurality of shearing steel bars (6) are driven into the inner annular wall of the underground buried tank (1), and polyurea is sprayed on the inner annular wall of the underground buried tank (1) for construction.
3. A method of constructing an underground LNG storage tank according to claim 2, characterized in that the shear bars (6) are welded integrally with the layered outer formwork (5).
4. The method for constructing the underground LNG storage tank according to claim 1, wherein a plurality of first embedded ribs (20), second embedded ribs (21) and third embedded ribs (22) are embedded in the reinforced concrete carrying platform (2) in the second step, the first embedded ribs (20) extend into an annular cavity between the outer support templates (5) and the underground buried groove (1), the second embedded ribs (21) are integrally welded with the outer support templates (5) respectively, and the third embedded ribs (22) are integrally welded with the inner tank body (7) respectively.
5. The method for constructing an underground LNG storage tank according to claim 1, wherein the outer circumferential wall of the inner tank body (7) in the fourth step is provided with an elastic felt (12).
6. The method for constructing the underground LNG storage tank according to claim 1, wherein in the fifth step, the inner tank body (7) and the inner dome plate (8) are integrally welded at the sealing joint, the inner joint (14) comprises a sealing ring (15) and a compression-resistant ring (16), the sealing ring (15) is integrally welded with the inner tank body (7), and the compression-resistant ring (16) is integrally welded with the inner dome plate (8).
7. The method for constructing an underground LNG storage tank according to claim 1, wherein in the fifth step, a plurality of suspended ceiling steel bars (9) are vertically connected to the inner dome plate (8), the plurality of suspended ceiling steel bars (9) are used to penetrate through the outer dome support plate (10) and extend upward, and the plurality of suspended ceiling steel bars (9) are integrally welded with the outer dome support plate (10), respectively.
8. The method for constructing the underground LNG storage tank according to claim 1, wherein in the sixth step, an outer connecting part (13) is arranged at the sealing connection part of the outer supporting template (5) and the outer dome supporting plate (10), the outer connecting part (13) comprises a sealing ring (15) and a compression-resistant ring (16), the sealing ring (15) is integrally welded with the outer supporting template (5), and the compression-resistant ring (16) is integrally welded with the outer dome supporting plate (10).
9. The method of constructing an underground LNG storage tank according to claim 1, wherein the cold-retaining material in step seven is expanded perlite micropowder (11).
10. The method for constructing an underground LNG tank according to claim 1, wherein the construction of spraying polyurea on the outer leaking surface of the outer dome plate integrally formed in the eighth step is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311348587.0A CN117108909B (en) | 2023-10-18 | 2023-10-18 | Construction method of underground LNG storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311348587.0A CN117108909B (en) | 2023-10-18 | 2023-10-18 | Construction method of underground LNG storage tank |
Publications (2)
| Publication Number | Publication Date |
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| CN117108909A CN117108909A (en) | 2023-11-24 |
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