Method for synchronously constructing inner tank and outer tank of LNG concrete full-capacity storage tank based on self-supporting lining

Abstract

The invention discloses a synchronous construction method for an inner tank and an outer tank of an LNG concrete full-capacity storage tank based on a self-supporting lining. The synchronous construction method for the inner tank and the outer tank of the LNG concrete full-capacity storage tank based on the self-supporting lining comprises the following steps that S1, a storage tank foundation structure is established; s2, mounting a self-supporting lining; and S3, synchronously building inner and outer tanks and sealing the top. According to the synchronous construction method for the inner tank and the outer tank of the LNG concrete full-capacity storage tank based on the self-supporting lining, through mutual independence of the construction processes of the inner tank and the outer tank, decoupling of construction of the inner tank and the outer tank is achieved, the requirement of a conventional construction method for the construction process is avoided, and the construction process of the storage tank is optimized; the process flexibility and the storage tank building construction efficiency are improved, and the construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of construction and construction methods, and in particular relates to a method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner. Background Art

[0002] In recent years, domestic natural gas consumption has grown rapidly, and the proportion of natural gas in energy supply has continued to increase. LNG storage tank projects have developed rapidly and have been more widely used. With the development of LNG storage tank projects, the construction method of LNG full-capacity concrete storage tanks has also received more research and discussion. The construction method of conventional LNG full-capacity concrete storage tanks is to establish the foundation and pedestal; pour the outer tank wall concrete; install the steel liner; install the steel dome and ceiling and gas lift the top; install the inner tank; fill the cold insulation material; pour the outer tank dome concrete, etc. However, the conventional construction method has strict requirements on the construction process, and the construction can only be carried out linearly according to the steps. The construction period is long, the construction process arrangement is not flexible, and the work efficiency is low.

[0003] Therefore, it is urgent to design a method for synchronously constructing the inner and outer tanks of a LNG concrete full-capacity storage tank based on a self-supporting lining to solve the problems of long construction period, inflexible construction process arrangement and low work efficiency of the conventional construction method mentioned above. Summary of the invention

[0004] In order to solve the technical problems of long construction period, inflexible construction process arrangement and low work efficiency of conventional construction methods mentioned in the background technology, a method for synchronous construction of inner and outer tanks of LNG concrete full-capacity storage tanks based on self-supporting lining is provided to solve the above problems.

[0005] To achieve the above-mentioned purpose, the specific technical scheme of the method for synchronously constructing the inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting lining of the present invention is as follows: A method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner comprises the following steps: S1. Establish the tank infrastructure; S2. Install the self-supporting lining; S3. Construct the inner and outer tanks simultaneously and cap them.

[0006] Further, the self-supporting lining is installed in S2, comprising the following steps: S21, install the first layer of concrete at the bottom of the outer tank wall; S22, construct self-supporting lining bottom lining panels, corner panels and wall lining panels; S23, construction of steel vaults and suspended ceilings; S24, perform gas lifting.

[0007] Further, in S22, the self-supporting lining bottom lining plate, the corner plate and the wall lining plate are constructed, including the following steps: S221, prefabricated base linings, corner panels and wall linings; The self-supporting lining plate should independently bear the load during the synchronous construction of the inner and outer tanks of the LNG full-capacity storage tank. After determining the thickness of the self-supporting lining plate, the annular plate, middle plate, corner plate and wall lining plate of the outer tank bottom lining plate are cut to ensure that the plate is smooth all around. The corner plate needs to be bent and the arc transition is required; S222, install the outer tank bottom lining and corner plate; After the self-supporting lining plate is prefabricated, the annular plate of the bottom lining plate is installed. After hoisting, it is positioned and installed after the installation direction is determined. After the annular plate is installed, the corner plate is installed. The upper side of the corner plate overlaps with the embedded parts of the first layer of concrete steel lining plate at the bottom of the outer tank wall, and the lower side overlaps with the annular plate of the bottom lining plate. The corner plates are installed by circumferential overlap; S223, install the middle plate and special-shaped plate; After the corner plates are installed, the middle plates are installed. The middle plates are laid from the center of the tank to the edge. The middle plates, the middle plates and the special-shaped plates, and the special-shaped plates and the annular plates are overlapped. S224, install wall lining; Install the first layer of wall lining at the bottom, weld two lifting ears symmetrically on the wall lining for hoisting, install temporary supports after it is in place, first weld them to the vertical embedded parts, and then weld them to the corner plates, and install the remaining layers of wall linings by overlapping from bottom to top. A pressure-bearing structure is set on the top of the topmost wall lining to support the steel vault and ceiling after gas jacking, and a reinforcement ring is installed on the inside of the wall lining.

[0008] Further, the steel vault and ceiling are constructed in S23, including the following steps: S231, construct ceiling panels; Lift the aluminum plates used for laying the ceiling panels into the tank, lay the aluminum plates from the inside out, and weld the ceiling panels from the inside out after laying; S232, prefabricated steel vault; The steel dome structure is divided into several areas along the radial direction, and each area is constructed simultaneously. First, the longitudinal beams in the radial direction and the annular beams of each ring layer are assembled to establish a frame structure. After the frame is welded, the vault plate is laid from the edge to the center, and the vault plate is welded to the frame; S233, installing prefabricated vault blocks; After the manufacture of each prefabricated vault block is completed, it is positioned at the center of the tank, and each prefabricated vault block is hoisted to the positioning position in sequence. After the vault block is hoisted in place, the annular beams between the vault blocks are welded, and the adjacent vault plates between the vault blocks are welded; S234, install the ceiling; After the prefabricated vault blocks are installed, hangers are welded between the ceiling panels and the vault block frames to connect the ceiling and the steel vault.

[0009] Furthermore, in S3, the inner and outer tanks are simultaneously constructed and capped, including the following steps: S31, construction of steel inner tank; First, prefabricate the steel inner tank plate of the storage tank. After prefabrication, hoist the bottom plate prefabricated plate first. After hoisting in place, weld from the edge to the center to complete the installation of the inner tank bottom plate. After installation, hoist the wall plate prefabricated plate and the reinforcement ring plate according to the circle layer. After each circle layer is hoisted in place separately, weld it. First weld the circumferential welds between the circles, then weld the welds between the inner wall plates of the circle layer, and finally weld the inner reinforcement ring of the circle layer to complete the construction of the inner tank; S32, constructing the concrete outer tank; The outer tank concrete wall is divided into layers according to the height, and each layer is constructed in sequence. The steel structure is installed first, and then the concrete is poured after the installation is completed. The outer tank concrete pouring is completed layer by layer; S33, tank capping; Construct a concrete dome, divide it into circles from the edge to the center, install the steel structure in different areas, and pour concrete after the installation is completed to complete the construction of the full-capacity LNG storage tank.

[0010] Furthermore, after the installation of the steel dome and the suspended ceiling is completed, the gas lift system is configured, and after the gas lift system is configured, the system is started to lift the steel dome and the suspended ceiling. After the steel dome is lifted to the target position, the steel dome is assembled and welded to the pressure-bearing structure on the top of the wall lining.

[0011] Furthermore, the air-lift roof configuration includes a lifting power system, a power monitoring system and a positioning and balancing system. The lifting power system provides pneumatic force for lifting the steel vault and suspended ceiling, the power monitoring system provides sufficient wind pressure to overcome the dead weight of the steel vault and suspended ceiling, and the positioning and balancing system ensures that the steel vault and suspended ceiling rise smoothly and vertically.

[0012] Furthermore, the self-supporting lining in S2 needs to meet the strength requirements of independently bearing the dead load, prestressed load, shrinkage load, wind load, air lift load and the combination of various load conditions in the construction structure.

[0013] Furthermore, in S3, the inner and outer tanks are constructed simultaneously and capped. When the outer tank and the inner tank of the corresponding height are completed, the cold-insulating materials are filled simultaneously.

[0014] Furthermore, the installation of the wall linings, the construction of the ceiling panels and the segmented prefabrication of the steel vault blocks can be carried out simultaneously.

[0015] The method for synchronously constructing the inner and outer tanks of the LNG concrete full-capacity storage tank based on the self-supporting lining of the present invention has the following advantages: By making the inner and outer tank construction processes independent of each other, the inner and outer tank construction is decoupled, avoiding the requirements of conventional construction methods for the construction process, optimizing the tank construction process, improving the process flexibility and tank construction efficiency, and saving construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of the method for synchronously constructing the inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to the present invention; Figure 2 A flow chart for installing a self-supporting liner for the present invention; Figure 3 Flow chart for constructing the self-supporting lining bottom lining panels, corner panels and wall lining panels for the present invention; Figure 4 Flowchart for constructing steel vaults and suspended ceilings for the present invention; Figure 5 The present invention is a flow chart for simultaneously constructing inner and outer tanks and capping them. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0019] Please refer to the attached Figure 1 To Attachment Figure 5 The invention describes a method for synchronously constructing inner and outer tanks of a LNG concrete full-capacity storage tank based on a self-supporting liner.

[0020] like Figure 1 As shown, the method for synchronously constructing the inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner in the present invention comprises the following steps: S1. Establish the tank infrastructure; According to the soil mechanics characteristics of the location of the LNG full-capacity storage tank, the appropriate foundation structure is selected to ensure the effective combination of the tank foundation and the soil, and to ensure the stability of the structure. The cap part of the foundation structure is made of reinforced concrete. According to the geometric dimensions of the cap structure in the foundation structure design, the cap reinforcement layout is determined and installed. After the steel bars are installed, concrete is poured to complete the cap concrete pouring.

[0021] S2. Install the self-supporting lining; The self-supporting lining in S2 needs to meet the strength requirements of independently bearing dead load, prestressed load, shrinkage load, wind load, air lift load and various load conditions combined in the construction structure.

[0022] S3. Construct the inner and outer tanks simultaneously and cap them.

[0023] By making the inner and outer tank construction processes independent of each other, the inner and outer tank construction is decoupled, avoiding the requirements of conventional construction methods for the construction process, optimizing the tank construction process, improving the process flexibility and tank construction efficiency, and saving construction time.

[0024] Further, if Figures 2 to 4 As shown, the self-supporting lining is installed in S2, including the following steps: S21, install the first layer of concrete at the bottom of the outer tank wall; Considering the strength requirements of the self-supporting lining, determine the geometric dimensions of the first layer of concrete at the bottom of the outer tank wall and the layout of the first layer of concrete reinforcement at the bottom of the outer tank. Install the self-supporting lining embedded parts while installing the reinforcement. After installation, pour concrete to complete the pouring of the first layer of concrete at the bottom of the wall.

[0025] S22, construct self-supporting lining bottom lining panels, corner panels and wall lining panels; The construction of the self-supporting lining bottom lining plate, corner plate and wall lining plate in S22 includes the following steps: S221, prefabricated bottom lining, corner plate and wall lining. The self-supporting lining plate shall independently bear the load during the synchronous construction of the inner and outer tanks of the LNG full-capacity storage tank. After determining the thickness of the self-supporting lining plate, the annular plate, middle plate, corner plate and wall lining plate of the outer tank bottom lining shall be cut to ensure that the plate is smooth all around. The corner plate needs to be bent and the arc transition shall be performed. S222. Install the outer tank bottom lining plate and corner plate. After the self-supporting lining plate is prefabricated, install the annular plate of the bottom lining plate. Position it after hoisting. Install it after determining the installation direction. After the annular plate is installed, install the corner plate. The upper side of the corner plate overlaps with the first layer of concrete steel lining embedded parts at the bottom of the outer tank wall, and the lower side overlaps with the annular plate of the bottom lining plate. The corner plates are installed by circumferential overlap. S223. Install the middle plate and the special-shaped plate. After the corner plate is installed, install the middle plate. The middle plate is laid from the center of the tank to the edge. The middle plates, the middle plates and the special-shaped plates, and the special-shaped plates and the annular plates are overlapped. S224. Install the wall linings, install the first layer of wall linings at the bottom, weld two lifting ears symmetrically on the wall linings for hoisting, install temporary supports after they are in place, first weld them to the vertical embedded parts, and then weld them to the corner plates, and install the remaining layers of wall linings from bottom to top by overlapping them. A pressure-bearing structure is set on the top of the topmost wall lining to support the steel vault and ceiling after gas jacking, and a reinforcement ring is installed on the inside of the wall lining.

[0026] S23, construction of steel vaults and suspended ceilings; The construction of the steel vault and ceiling in S23 includes the following steps; S231, construct the ceiling panel, hoist the aluminum plate used for laying the ceiling panel into the interior of the storage tank, lay the aluminum plate from the inside to the outside, and weld the ceiling panel from the inside to the outside after the laying is completed; S232, prefabricate the steel dome in blocks, divide the steel dome structure into several areas along the radial direction, and construct each area simultaneously. First, assemble the longitudinal beams in the radial direction and the annular beams of each ring layer to establish a frame structure. After the frame is welded, lay the dome plate from the edge to the center, and weld the dome plate to the frame; S233, install the prefabricated vault blocks, after each prefabricated vault block is manufactured, position it at the center of the tank, and hoist each prefabricated vault block to the positioning position in sequence. After the vault blocks are hoisted in place, weld the annular beams between the vault blocks, and weld the adjacent vault plates between the vault blocks; S234, installing the suspended ceiling. After installing the prefabricated vault blocks, welding hangers between the suspended ceiling panels and the vault block frames to connect the suspended ceiling and the steel vault.

[0027] S24, perform gas lifting.

[0028] After the steel vault and suspended ceiling are installed, the gas lift configuration is first carried out, including the lifting power system, power monitoring system and positioning and balancing system.

[0029] The lifting power system provides air power for lifting steel vaults and suspended ceilings. The main component is a fan, and the air pressure of the fan output is adjusted by monitoring parameters. The power monitoring system is a pressure measurement system that ensures that sufficient air pressure is provided to overcome the deadweight of the steel vaults and suspended ceilings. The positioning balance system refers to the mechanical structure and counterweight set to ensure the smooth vertical rise of the steel vaults and suspended ceilings.

[0030] After the gas lifting system configuration is completed, the system is started to lift the steel dome and ceiling. When the dome rises to the target position, the dome is assembled and welded to the pressure-bearing structure on the top of the wall lining.

[0031] Further, if Figure 5 As shown, in S3, the inner and outer tanks are simultaneously constructed and capped, including the following steps: S31. To build a steel inner tank, first prefabricate the steel inner tank plate of the storage tank. After prefabrication, first hoist the bottom plate prefabricated plate. After hoisting in place, weld from the edge to the center to complete the installation of the inner tank bottom plate. After installation, hoist the wall plate prefabricated plate and the reinforcement ring plate according to the circle layer. After each circle layer is hoisted in place separately, weld it. First weld the circumferential welds between the circles, then weld the welds between the inner wall plates of the circle layer, and finally weld the reinforcement ring inside the circle layer to complete the construction of the inner tank; S32. Construct the concrete outer tank, divide the outer tank concrete wall into layers according to the height, and construct each layer in turn. First install the steel structure, and then pour the concrete after the installation is completed. Complete the outer tank concrete pouring layer by layer. At the same time, when the outer tank and inner tank of the corresponding height are completed, fill the cold insulation material simultaneously.

[0032] S33, tank capping. When the construction of inner and outer tanks and cold-insulation filling are completed, a concrete dome is built. The layers are divided from the edge to the center, and the steel structure is installed in different areas. After the installation is completed, concrete is poured to complete the construction of the full-capacity LNG storage tank.

[0033] Furthermore, the installation of the wall linings, the construction of the ceiling panels and the segmented prefabrication of the steel vault blocks can be carried out simultaneously.

[0034] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner, characterized in that: The steps include: S1. Establish the tank infrastructure; S2. Install the self-supporting lining; S3. Construct the inner and outer tanks simultaneously and cap them.

2. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 1 is characterized in that: The self-supporting lining is installed in S2, including the following steps: S21, install the first layer of concrete at the bottom of the outer tank wall; S22, construct self-supporting lining bottom lining panels, corner panels and wall lining panels; S23, construction of steel vaults and suspended ceilings; S24, perform gas lifting.

3. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 2 is characterized in that: The construction of the self-supporting lining bottom lining plate, corner plate and wall lining plate in S22 includes the following steps: S221, prefabricated base linings, corner panels and wall linings; The self-supporting lining plate should independently bear the load during the synchronous construction of the inner and outer tanks of the LNG full-capacity storage tank. After determining the thickness of the self-supporting lining plate, the annular plate, middle plate, corner plate and wall lining plate of the outer tank bottom lining plate are cut to ensure that the plate is smooth all around. The corner plate needs to be bent and the arc transition is required; S222, install the outer tank bottom lining and corner plate; After the self-supporting lining plate is prefabricated, the annular plate of the bottom lining plate is installed. After hoisting, it is positioned and installed after the installation direction is determined. After the annular plate is installed, the corner plate is installed. The upper side of the corner plate overlaps with the embedded parts of the first layer of concrete steel lining plate at the bottom of the outer tank wall, and the lower side overlaps with the annular plate of the bottom lining plate. The corner plates are installed by circumferential overlap; S223, install the middle plate and special-shaped plate; After the corner plates are installed, the middle plates are installed. The middle plates are laid from the center of the tank to the edge. The middle plates, the middle plates and the special-shaped plates, and the special-shaped plates and the annular plates are overlapped. S224, install wall lining; Install the first layer of wall lining at the bottom, weld two lifting ears symmetrically on the wall lining for hoisting, install temporary supports after it is in place, first weld them to the vertical embedded parts, and then weld them to the corner plates, and install the remaining layers of wall linings by overlapping from bottom to top. A pressure-bearing structure is set on the top of the topmost wall lining to support the steel vault and ceiling after gas jacking, and a reinforcement ring is installed on the inside of the wall lining.

4. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 2 is characterized in that: The construction of the steel vault and ceiling in S23 includes the following steps; S231, construct ceiling panels; Lift the aluminum plates used for laying the ceiling panels into the tank, lay the aluminum plates from the inside out, and weld the ceiling panels from the inside out after laying; S232, prefabricated steel vault; The steel dome structure is divided into several areas along the radial direction, and each area is constructed simultaneously. First, the longitudinal beams in the radial direction and the annular beams of each ring layer are assembled to establish a frame structure. After the frame is welded, the vault plate is laid from the edge to the center, and the vault plate is welded to the frame; S233, installing prefabricated vault blocks; After the manufacture of each prefabricated vault block is completed, it is positioned at the center of the tank, and each prefabricated vault block is hoisted to the positioning position in sequence. After the vault block is hoisted in place, the annular beams between the vault blocks are welded, and the adjacent vault plates between the vault blocks are welded; S234, install the ceiling; After the prefabricated vault blocks are installed, hangers are welded between the ceiling panels and the vault block frames to connect the ceiling and the steel vault.

5. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 1 is characterized in that: In S3, the inner and outer tanks are constructed and capped simultaneously, including the following steps: S31, construction of steel inner tank; First, prefabricate the steel inner tank plate of the storage tank. After prefabrication, hoist the bottom plate prefabricated plate first. After hoisting in place, weld from the edge to the center to complete the installation of the inner tank bottom plate. After installation, hoist the wall plate prefabricated plate and the reinforcement ring plate according to the circle layer. After each circle layer is hoisted in place separately, weld it. First weld the circumferential welds between the circles, then weld the welds between the inner wall plates of the circle layer, and finally weld the inner reinforcement ring of the circle layer to complete the construction of the inner tank; S32, constructing the concrete outer tank; The outer tank concrete wall is divided into layers according to the height, and each layer is constructed in sequence. The steel structure is installed first, and then the concrete is poured after the installation is completed. The outer tank concrete pouring is completed layer by layer; S33, tank capping; Construct a concrete dome, divide it into circles from the edge to the center, install the steel structure in different areas, and pour concrete after the installation is completed to complete the construction of the full-capacity LNG storage tank.

6. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 2 is characterized in that: After the installation of the steel dome and suspended ceiling is completed, the gas lift system is configured and the system is started to lift the steel dome and suspended ceiling. After the steel dome is lifted to the target position, the steel dome is assembled and welded to the pressure-bearing structure on the top of the wall lining.

7. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 6 is characterized in that: The gas-lift roof configuration includes a lifting power system, a power monitoring system and a positioning and balancing system. The lifting power system provides pneumatic force for lifting steel vaults and suspended ceilings. The power monitoring system provides sufficient wind pressure to overcome the deadweight of steel vaults and suspended ceilings. The positioning and balancing system ensures that the steel vaults and suspended ceilings rise smoothly and vertically.

8. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 1 is characterized in that: The self-supporting lining in S2 needs to meet the strength requirements of independently bearing dead load, prestressed load, shrinkage load, wind load, air lift load and various load conditions combined in the construction structure.

9. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 1 is characterized in that: In S3, the inner and outer tanks are constructed simultaneously and capped. When the outer and inner tanks of corresponding heights are completed, they are filled with cold-insulating materials simultaneously.

10. The method for synchronously constructing inner and outer tanks of a full-capacity LNG concrete storage tank based on a self-supporting liner according to claim 4 is characterized in that: The installation of the wall lining, the construction of the ceiling panels and the segmentation of the prefabricated steel vault blocks can be carried out simultaneously.

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