CN110761469A - Layered and annular pouring control method for pressure-maintaining dome concrete in LNG storage tank stage - Google Patents
Layered and annular pouring control method for pressure-maintaining dome concrete in LNG storage tank stage Download PDFInfo
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- CN110761469A CN110761469A CN201911035016.5A CN201911035016A CN110761469A CN 110761469 A CN110761469 A CN 110761469A CN 201911035016 A CN201911035016 A CN 201911035016A CN 110761469 A CN110761469 A CN 110761469A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/08—Vaulted roofs
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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- 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
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Abstract
The invention discloses a layered and annular pouring control method for pressure-maintaining dome concrete in an LNG storage tank stage, which comprises the following steps: 1) performing annular prestress tensioning on a lower ring beam of the ring beam (1); 2) carrying out air pressure jacking on the dome-shaped steel latticed shell structure; 3) dividing a pouring layer of the dome into a first pouring layer and a second pouring layer from bottom to top; each pouring layer is divided into a multistage annular area B from outside to insidej(j ≧ 1, … …, m, m ≧ 2); 4) carrying out a first-stage annular region B of a first casting layer1Pouring the concrete; a first-stage annular area B of a first pouring layer1After the concrete reaches a preset strength value, pressurizing the tank to a preset pressure, and carrying out step-by-step continuous casting on the first casting layer under the pressure maintaining state in the tank to carry out maintenance work; 5) the pressure in the tank is removed, and the second pouring layer is gradually pouredAnd (4) performing cascade continuous pouring, wherein the construction joint between the second pouring layer and the first pouring layer is in staggered joint lap joint.
Description
Technical Field
The invention relates to a layered and annular pouring control method for pressure maintaining dome concrete at an LNG storage tank stage, and belongs to the technical field of LNG transportation and distribution.
Background
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. The low temperature effect makes the storage state of the material change greatly, the volume is compressed to about 1/600, and the density is about 480kg/m3Is colorless, odorless and non-corrosive. 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. The bearing platform and the dome are both of reinforced concrete structures, the outer tank is of a prestressed reinforced concrete structure, and a secondary container with LNG airtightness and structural performance is formed together, so that the storage tank is ensured to run safely at low temperature and normal pressure, and the BOG (boil off gas) loss of the storage tank is controlled within an economic and reasonable range; the inner tank is typically welded from X7Ni9 steel plate into an open-topped flat-bottomed cylindrical structure as the primary vessel for LNG loading. An annular space is reserved between the LNG material and the external environment, and the LNG material and the external environment are filled with cold insulation materials with low thermal conductivity to control the heat exchange rate. In the design and construction process of the storage tank, analysis and calculation must be carried out according to the geological conditions of a construction site, and the storage tank structure is ensured to meet the requirement of anti-seismic performance under the action of high seismic force (SSE safe outage earthquake). In addition, strict control is also requiredThe pouring quality of the reinforced concrete ensures the durability of the storage tank.
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. Particularly, in the process of pouring the dome concrete, the whole dome structure is in a non-structural integral bearing state, and the safety and reliability of the construction process can be ensured only under the action of air pressure for keeping a certain pressure in a tank for construction load, reinforced concrete and other material loads; in addition, the dome concrete is easy to generate structural cracks under the action of combined working conditions, and the safety reliability and the durability of the dome structure are seriously influenced.
Disclosure of Invention
In view of the above problems, the invention aims to provide a control method for layered and annular pouring of pressure-maintaining dome concrete in an LNG storage tank stage, which can significantly improve the safety reliability and durability of a storage tank dome structure and improve the dome pouring construction efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme that the method for controlling the layered and annular pouring of the concrete of the pressure maintaining dome at the LNG storage tank stage is characterized by comprising the following steps of:
1) performing annular prestress tensioning on a lower ring beam of the ring beam;
2) carrying out air pressure jacking on the dome-shaped steel latticed shell structure;
3) dividing a pouring layer of the dome into a first pouring layer and a second pouring layer from bottom to top; each pouring layer is divided into a multistage annular area B from outside to insidej(j＝1，……，m，m≥2)；
4) Carrying out a first-stage annular region B of a first casting layer1Pouring the concrete; a first-stage annular area B of a first pouring layer1After the concrete reaches a preset strength value, pressurizing the tank to a set pressure, and continuously casting the first casting layer step by step under the pressure maintaining state in the tank until the last-stage annular area B of the first casting layer is finishedmPouring is completed, and maintenance work is carried out;
5) and (4) removing the pressure in the tank, and continuously casting the second casting layer step by step, wherein the construction joint between the second casting layer and the first casting layer is in staggered joint lap joint.
Further, in the step 3), the first pouring layer and the second pouring layer are divided into 4-8-grade annular areas, namely B, from outside to inside according to equal-volume concretej(j＝1，2，3……，m，4≤m≤8)。
Further, the concrete thickness of the first casting layer is 1/2 or more of the total concrete thickness of the dome.
Further, in the steps 1) and 2), after 2-4 circles of annular prestress tensioning of the lower annular beam of the annular beam is completed, the air pressure jacking work of the dome-shaped steel latticed shell structure in the step 2) is carried out.
Further, in the step 4), the first-stage annular area B of the first casting layer is formed1Before the pouring work, the pouring of the upper ring beam of the ring beam and the binding work of the bottom layer steel bars and the erection bars of the dome are carried out;
in the step 4), the first-stage annular area B of the first pouring layer1And completing the pouring work in a state of not maintaining pressure in the tank.
Further, in the step 4), the predetermined strength is more than 10MPa, the set pressure is between 4kPa and 8kPa, in the step-by-step continuous concrete pouring process of the first pouring layer under the pressure keeping state, the pressure value in the tank is measured by adopting a U-shaped water column, and the pressure variation fluctuation is within the range of +/-2 cm of water column.
Further, in the step 5), when the concrete curing strength of the first pouring layer reaches more than 40MPa, the pressure in the tank is removed;
in the step 5), before the pouring work of the second pouring layer is carried out, cleaning treatment is carried out on the concrete surface of the first pouring layer, wherein the cleaning treatment comprises removal of loose stones and cleaning of dust and loose impurities; and finishing the top layer steel bar binding work of the dome.
Further, in the step 5), the gap width of the construction joint between the first casting layer and the second casting layer is 0.5m or more.
Further, in the above-described step 4) and step 5), each stage of the ring region BjAnd the concrete pouring is finished in a continuous pouring mode, and if the pouring is stopped in the middle, the stopping time is below the initial setting time of the concrete.
Furthermore, the dome is of a spherical crown type reinforced concrete structure, and the relation between the radius R of the spherical crown and the inner diameter D of the outer tank is that R is more than or equal to D and is more than or equal to D-5;
the concrete of the dome adopts the strength grade of more than C40, and the reinforcing steel bars adopt the mark of more than HRB 400;
two sets of blower equipment with air supply capacity of more than 10kPa are adopted, wherein one set supplies pressure to the storage tank in real time, and the other set is used for standby.
By adopting the technical scheme, the invention has the following advantages: compared with the conventional technology of pouring all dome concrete under the conditions of not performing the pre-stress tensioning on the lower part of the ring beam and constant tank internal pressure in the existing LNG industry, the control method provided by the invention has the advantages that the storage tank dome concrete is subjected to the tensioning of the pre-stress on the lower part of the ring beam of the tank top before being poured, and a certain pre-tightening force and stability are provided for the pouring process of the dome concrete; in the control method of layered and annular pouring, the pressure in the tank is maintained only during the pouring of the first pouring layer, and the pressure in the tank is removed after the concrete reaches the preset strength, so that the cross construction operation of the tank top and the tank can be carried out, the pressure maintaining time in the tank is greatly shortened, and the construction efficiency of the storage tank is improved; in addition, the second pouring layer can be reasonably arranged through the construction joints during pouring, and the upper layer concrete and the lower layer concrete are effectively matched, so that the quality problems that more annular and radial micro cracks and the like appear on the upper surface of the concrete during construction are avoided. The continuous pouring quality and the structural integrity of the concrete in the construction process are remarkably improved, and the safety reliability and the durability of the dome structure are greatly improved.
Drawings
FIG. 1 is a central symmetrical sectional view of a concrete structure of an LNG storage tank;
FIG. 2 is a top view of a dome cast section ring;
in the figure, 1, a ring beam; 11. a lower ring beam; 12. an upper ring beam; 2. a dome; 20. a section steel reticulated shell structure; 21. a first casting layer; 22. a second pouring layer; 3. and (4) an outer tank.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 1 and fig. 2, the invention provides a layered and annular pouring control method for concrete of a pressure-maintaining dome at an LNG storage tank stage, which comprises the following steps:
1) performing annular prestress tensioning on the lower ring beam 11 of the ring beam 1;
2) carrying out air pressure jacking on the section steel latticed shell structure 20 of the dome 2;
3) dividing a pouring layer of the dome 2 into a first pouring layer 21 and a second pouring layer 22 from bottom to top; each pouring layer is divided into a multistage annular area B from outside to insidej(j＝1，……，m，m≥2)；
4) Carrying out a first stage annular region B of the first casting layer 211Pouring the concrete; a first-stage annular region B of the first casting layer 211After the concrete reaches a preset strength value, pressurizing the tank to a set pressure, and continuously casting the first casting layer 21 step by step under the pressure maintaining state in the tank until the last-stage annular area B of the first casting layer 21 is finishedmPouring is completed, and maintenance work is carried out;
5) and (3) removing the pressure in the tank, and carrying out step-by-step continuous casting on the second casting layer 22, wherein the construction joint between the second casting layer 22 and the first casting layer 21 is in staggered joint lap joint.
In the above embodiment, preferably, in the step 3), the casting layer of the dome 2 is divided into the first casting layer 21 and the second casting layer 22 from bottom to top; the first pouring layer 21 and the second pouring layer 22 are divided into 4-8-level annular regions from outside to inside according to equal-square-amount concrete, namely Bj(j＝1，2，3……，m，4≤m≤8)。
In the above embodiment, the concrete thickness of the first casting layer 21 is preferably 1/2 or more of the total concrete thickness of the dome 2;
in the above embodiment, it is preferable that the pneumatic jacking work of the steel lattice shell structure 20 of the dome 2 in the step 2) is performed after the completion of the 2-4 hoop prestressing tensioning of the lower hoop beam 11 of the hoop beam 1 in the above steps 1) and 2).
In the above embodiment, preferably, in the step 4), the first-stage annular region B of the first casting layer 21 is performed1Before the pouring work of the ring beam 1, the upper ring beam 12 of the ring beam 1 is poured and the bottom layer steel bars and the erection bars of the dome 2 are bound.
In the above embodiment, preferably, in the step 4), the first-stage annular region B of the first casting layer 211And completing the pouring work in a state of not maintaining pressure in the tank.
In the above embodiment, it is preferable that, in the step 4), the predetermined intensity value is 10MPa or more; the pressure is set to be between 4kPa and 8kPa, in the step-by-step continuous concrete pouring process of the first pouring layer 21 under the pressure maintaining state in the tank, the pressure value in the tank is measured by adopting a U-shaped water column, and the fluctuation of the pressure change is within the range of +/-2 cm of the water column.
In the above embodiment, preferably, in the step 5), when the concrete curing strength of the first casting layer 21 reaches 40MPa or more, the internal pressure of the tank is released.
In the above embodiment, preferably, in the step 5), before the casting work of the second casting layer 22, the concrete surface of the first casting layer 21 is cleaned, and the cleaning process includes removing loose stones and cleaning dust and loose impurities.
In the above embodiment, preferably, in the above step 5), the top-layer reinforcement work of the dome 2 is performed before the concrete of the second casting layer 22 is cast.
In the above embodiment, in the step 5), the gap width of the construction joint between the first casting layer 21 and the second casting layer 22 is preferably 0.5m or more.
In the above embodiment, it is preferable that each stage of the ring region B is in the above step 4) and step 5)jAnd the concrete pouring is finished in a continuous pouring mode, and if the pouring is stopped in the middle, the stopping time is below the initial setting time of the concrete.
In the above embodiment, preferably, the dome 2 is made of a spherical crown type reinforced concrete structure, and the relationship between the radius R of the spherical crown and the inner diameter D of the outer tank 3 is: r is more than or equal to D-5 and less than or equal to D.
In the above embodiment, it is preferable that the concrete of the dome 2 is of a strength grade of C40 or more and the steel bars are of a grade of HRB400 or more.
In the above embodiment, preferably, the present invention employs two sets of blower devices with air supply capacity of 10kPa or more, wherein one set supplies pressure to the storage tank in real time, and the other set is used as a backup.
The control method of the present invention is described below by taking a 16 ten thousand square LNG storage tank as an example, and the specific process is as follows:
1) performing annular prestress tensioning on the lower ring beam 11 of the ring beam 1;
2) carrying out air pressure jacking on the section steel latticed shell structure 20 of the dome 2;
3) dividing a pouring layer of the dome 2 into a first pouring layer 21 and a second pouring layer 22 from bottom to top; each pouring layer is divided into 4-8-grade annular areas according to equal-volume concrete from outside to inside;
4) carrying out a first stage annular region B of the first casting layer 211Pouring the concrete; a first-stage annular region B of the first casting layer 211When the strength of the concrete reaches more than 10MPa, applying pressure (4-9kPa) to the tank, and starting the step-by-step continuous casting of the first casting layer 21 until the last annular region B of the first casting layer 21 is finishedmPouring is completed, and maintenance work is carried out;
5) the concrete strength of the first pouring layer 21 reaches more than 40MPa, so that the pressure in the tank can be removed; and then, the second pouring layer 22 is continuously poured step by step, and the construction joint between the first pouring layer 21 and the second pouring layer 22 is in staggered joint overlapping.
In the above embodiment, the dome of the 16-ten-thousand-square LNG storage tank is of a spherical crown reinforced concrete structure, the inner diameter of the outer tank of the 16-thousand-square LNG storage tank is 82m, and the radius R of the spherical crown is 80 m.
In the above embodiments, the concrete of the dome is of strength grade above C40, and the steel bars are of grade above HRB 400E.
The present invention has been described with reference to the above embodiments, and the structure, arrangement, and connection of the respective members may be changed. On the basis of the technical scheme of the invention, the improvement or equivalent transformation of the individual components according to the principle of the invention is not excluded from the protection scope of the invention.
Claims (10)
1. A layered and annular pouring control method for pressure maintaining dome concrete in an LNG storage tank stage is characterized by comprising the following steps:
1) performing annular prestress tensioning on a lower ring beam (11) of the ring beam (1);
2) carrying out air pressure jacking on the section steel latticed shell structure (20) of the dome (2);
3) dividing a pouring layer of the dome (2) into a first pouring layer (21) and a second pouring layer (22) from bottom to top; each pouring layer is divided into a multistage annular area B from outside to insidej(j＝1，……，m，m≥2)；
4) Carrying out a first-stage annular region B of a first casting layer (21)1Pouring the concrete; a first-stage annular area B of the first casting layer (21)1After the concrete reaches a preset strength value, pressurizing the tank to a set pressure, and continuously casting the first casting layer (21) step by step under the pressure maintaining state in the tank until the last-stage annular area B of the first casting layer (21) is finishedmPouring is completed, and maintenance work is carried out;
5) and (3) removing the pressure in the tank, and carrying out step-by-step continuous casting on the second casting layer (22), wherein the construction joint between the second casting layer (22) and the first casting layer (21) is in staggered joint lap joint.
2. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method as claimed in claim 1, wherein: in the step 3), the first pouring layer (21) and the second pouring layer (22) are divided into 4-8-grade annular areas, namely B, from outside to inside according to equal square amount of concretej(j＝1，2，3……，m，4≤m≤8)。
3. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method of claim 1 or 2, wherein: the concrete thickness of the first casting layer (21) is more than 1/2 of the total concrete thickness of the dome (2).
4. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method as claimed in claim 1, wherein: in the steps 1) and 2), after 2-4 circles of annular prestress tensioning of the lower annular beam (11) of the annular beam (1) is completed, the air pressure jacking work of the section steel latticed shell structure (20) of the dome (2) in the step 2) is carried out.
5. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method as claimed in claim 1, wherein: in the step 4), the first-stage annular area B of the first casting layer (21) is formed1Before the pouring work, the upper ring beam (12) of the ring beam (1) is poured and the bottom layer steel bars and the erection bars of the dome (2) are bound;
in the step 4), the first-stage annular area B of the first pouring layer (21)1And completing the pouring work in a state of not maintaining pressure in the tank.
6. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method as claimed in claim 1, wherein: in the step 4), the preset strength is more than 10MPa, the set pressure is between 4kPa and 8kPa, the measurement of the pressure value in the tank is carried out by adopting a U-shaped water column in the step-by-step continuous concrete pouring process of the first pouring layer (21) under the pressure keeping state, and the fluctuation of the pressure is within the range of +/-2 cm of water column.
7. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method as claimed in claim 1, wherein: in the step 5), when the concrete curing strength of the first pouring layer (21) reaches more than 40MPa, the pressure in the tank is removed;
in the step 5), before the pouring work of the second pouring layer (22) is carried out, cleaning treatment is carried out on the concrete surface of the first pouring layer (21), wherein the cleaning treatment comprises removal of loose stones and cleaning of dust and loose impurities; finishing the top layer steel bar binding work of the dome (2).
8. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method as claimed in claim 1, wherein: in the step 5), the gap width of the construction joint between the first casting layer (21) and the second casting layer (22) is more than 0.5 m.
9. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method as claimed in claim 1, wherein: in the above-mentioned step 4) and step 5), each stage of the ring region BjAnd the concrete pouring is finished in a continuous pouring mode, and if the pouring is stopped in the middle, the stopping time is below the initial setting time of the concrete.
10. The LNG storage tank stage pressure maintaining dome concrete layered ring-divided pouring control method as claimed in claim 1, wherein: the dome (2) is of a spherical crown type reinforced concrete structure, and the relation between the radius R of the spherical crown and the inner diameter D of the outer tank (3) is that R is more than or equal to D and is more than or equal to D-5;
the concrete of the dome (2) adopts the strength grade of more than C40, and the steel bars adopt the mark of more than HRB 400;
two sets of blower equipment with air supply capacity of more than 10kPa are adopted, wherein one set supplies pressure to the storage tank in real time, and the other set is used for standby.
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| CN112482857A (en) * | 2020-10-14 | 2021-03-12 | 上海建工二建集团有限公司 | Silo, silo top construction method thereof and air bag type formwork system of silo top |
| CN112482856A (en) * | 2020-10-14 | 2021-03-12 | 上海建工二建集团有限公司 | Silo and construction method of silo top of circular arc body structure of silo |
| CN112942943A (en) * | 2021-01-30 | 2021-06-11 | 东北石油大学 | LNG composite shell intelligent storage tank under permafrost layer in cold region and construction method |
| CN113338686A (en) * | 2021-05-14 | 2021-09-03 | 海洋石油工程股份有限公司 | LNG storage tank dome structure and construction method |
| CN114635567A (en) * | 2022-01-13 | 2022-06-17 | 上海二十冶建设有限公司 | Method for controlling error of pouring of dome concrete |
| CN114718187A (en) * | 2022-02-28 | 2022-07-08 | 中国中原对外工程有限公司 | Dome and construction method |
| CN114892874A (en) * | 2022-04-26 | 2022-08-12 | 中国核电工程有限公司 | Large-span dome of containment and construction method thereof |
| CN114922490A (en) * | 2022-06-27 | 2022-08-19 | 中国建筑一局(集团)有限公司 | LNG storage tank outer tank dome concrete pressure-maintaining pouring construction optimization method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112482857A (en) * | 2020-10-14 | 2021-03-12 | 上海建工二建集团有限公司 | Silo, silo top construction method thereof and air bag type formwork system of silo top |
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| CN114718187A (en) * | 2022-02-28 | 2022-07-08 | 中国中原对外工程有限公司 | Dome and construction method |
| CN114892874A (en) * | 2022-04-26 | 2022-08-12 | 中国核电工程有限公司 | Large-span dome of containment and construction method thereof |
| CN114922490A (en) * | 2022-06-27 | 2022-08-19 | 中国建筑一局(集团)有限公司 | LNG storage tank outer tank dome concrete pressure-maintaining pouring construction optimization method |
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