Concrete outer tank and full-capacity low-temperature storage tank
By setting annular and axial reinforcement components in the concrete outer tank to form a mesh sleeve structure, the problem of cracks prone to loads in the concrete outer tank is solved, and the safety of use is improved.
Patent Information
- Application Number
- CN202420538041.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-19
AI Technical Summary
Existing concrete outer tanks are prone to cracks when subjected to hydrostatic pressure, air pressure and temperature loads, which affects their safety of use.
At least two layers of annular reinforcement components and an axial reinforcement components are arranged in the concrete outer tank. The second slow-bonded prestressed rib and the first slow-bonded prestressed rib cross to form a mesh sleeve structure to enhance the ability to withstand load.
By strengthening the assembly, the load bearing capacity and use safety of concrete outer tanks are improved, and the problem of low use safety of concrete outer tanks in the prior art is solved.
Smart Images
Figure CN222555648U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building construction, in particular to a concrete outer tank and a full-capacity low-temperature storage tank. Background Art
[0002] Large cryogenic full-volume storage tanks consist of a steel inner tank, a concrete outer tank, and a cold insulation layer. The main function of the concrete outer tank is to prevent the inner tank from leaking liquefied natural gas into the atmosphere and to protect the inner tank from safe use under conditions such as fire and earthquake. When the inner tank leaks, the outer tank needs to withstand the hydrostatic pressure generated by the leaking liquid medium and the air pressure generated by the evaporating gas, and will also be affected by temperature loads. Under the combined effects of various loads, cracks are prone to appear in the outer tank, affecting the safety of the outer tank. Therefore, how to improve the safety of concrete outer tanks is an urgent problem that the industry needs to solve. Utility Model Content
[0003] The utility model provides a concrete outer tank and a full-capacity low-temperature storage tank, which are used to solve the problem of low use safety of the concrete outer tank in the prior art.
[0004] The first aspect of the utility model provides a concrete outer tank, comprising:
[0005] The outer tank is a concrete structure;
[0006] At least two layers of annular reinforcement components are arranged along the axial direction of the outer tank, and the projection of each layer of the annular reinforcement components on the horizontal plane is circular; the annular reinforcement components include at least two of the first slow-bonding prestressed tendons, the first slow-bonding prestressed tendons are arranged in the concrete around the circumference of the outer tank, and the fixed end and the tensioning end of the first slow-bonding prestressed tendons form an angle of 180°;
[0007] The axial reinforcement assembly includes at least two second slow-bonding prestressed tendons, which cross the first slow-bonding prestressed tendons and are arranged in the concrete along the axial direction of the outer tank.
[0008] The concrete outer tank provided by the utility model also includes:
[0009] Four or six buttresses are formed on the outer side of the outer tank, and the buttresses are arranged around the circumference of the outer tank;
[0010] An anchor assembly is arranged on the buttress column, and the anchor assembly is connected to the first slow-bonding prestressed tendon and is used for tensioning the first slow-bonding prestressed tendon.
[0011] According to the concrete outer tank provided by the utility model, the anchor assembly comprises:
[0012] A tensioning end structural member connected to the tensioning end of the first slow-bonding prestressed tendon;
[0013] The anchoring end structural member is connected to the fixed end of the first slow-bonding prestressed tendon.
[0014] According to the concrete outer tank provided by the utility model, at least one buttress column is arranged between the fixed end and the tensioning end of the same first slow-bonding prestressed tendon.
[0015] The concrete outer tank provided by the utility model also includes:
[0016] The escalator is arranged on the outer side of the outer tank.
[0017] According to the concrete outer tank provided by the utility model, the escalator is a spiral escalator.
[0018] The concrete outer tank provided by the utility model also includes:
[0019] A support platform, the bottom of which is buried in the ground, the top of which is connected to the outer tank, and a ventilation space is formed between the bottom surface of the outer tank and the ground.
[0020] According to the concrete outer tank provided by the utility model, the distance between the bottom surface of the outer tank and the ground is 1 meter to 2 meters.
[0021] According to the concrete outer tank provided by the utility model, the first slow-bonding prestressed tendons and the second slow-bonding prestressed tendons have the same structure; the first slow-bonding prestressed tendons include:
[0022] An outer sheath, wherein at least two recessed portions are formed around the circumference of the outer sheath, and the two recessed portions are arranged along the axial direction of the outer sheath;
[0023] The steel strand is axially arranged in the outer sheath, and a slow-setting adhesive layer is arranged between the steel strand and the outer sheath.
[0024] A second aspect of the utility model provides a full-containment low-temperature storage tank, comprising an inner tank and the concrete outer tank described in any one of the above items, wherein the inner tank is arranged in the concrete outer tank.
[0025] The utility model provides a concrete outer tank and a full-capacity low-temperature storage tank, which improve the load-bearing capacity and the safety of use by arranging at least two layers of annular reinforcement components and an axial reinforcement component in the concrete, and the second slow-bonding prestressed tendons cross the first slow-bonding prestressed tendons, and the second slow-bonding prestressed tendons and the first slow-bonding prestressed tendons form a mesh sleeve structure, thereby improving the load-bearing capacity and the safety of use, and solving the problem of low safety of use in the existing concrete outer tank.
[0026] Furthermore, the annular reinforcement component includes at least two first slow-bonding prestressed tendons, which are arranged in the concrete around the circumference of the outer tank, and the axial reinforcement component includes at least two second slow-bonding prestressed tendons, which are arranged in the concrete along the axial direction of the outer tank. There is no need to pass through a corrugated pipe or grouting, which reduces two complex processes and fundamentally solves the problem of water attachment and holes caused by insufficient grouting density in the prior art, thereby improving the stability and safety of the concrete outer tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0028] Figure 1 It is a partial cross-sectional structural schematic diagram of the concrete outer tank provided by the utility model;
[0029] Figure 2 It is a schematic diagram of the top view structure of the concrete outer tank provided by the utility model;
[0030] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;
[0031] Figure 4 yes Figure 2 A schematic diagram of the enlarged structure at B in the middle;
[0032] Figure 5 It is a single anchor node prestressed tendon fixed end node component;
[0033] Figure 6 It is a large sample of the fixed end node of the prestressed tendon of a single anchor node;
[0034] Figure 7 It is a single anchor node prestressed tendon tensioning end node component;
[0035] Figure 8 It is a large sample of the prestressed tendon tensioning end node of a single anchor node;
[0036] Fig. 9 It is one of the large samples of the fixed end nodes of the prestressed tendons of the group anchor nodes;
[0037] Fig.10 This is the second sample of the fixed end node of the prestressed tendons of the group anchor node;
[0038] Fig.11It is the large sample of the prestressed tendon tensioning end node of the group anchor node;
[0039] Fig.12 It is a partial cross-sectional structural schematic diagram of the first slow-bonding prestressed tendons of the concrete outer tank of the utility model.
[0040] Reference numerals:
[0041] 100. Outer tank;
[0042] 200, annular reinforcement assembly; 211, outer sheath; 212, steel strand; 213, slow-setting adhesive layer; 201, recessed portion;
[0043] 300, axial reinforcement assembly;
[0044] 400, buttresses;
[0045] 510, anchoring end structural member; 511, extrusion anchor; 512, first pressure bearing plate; 513, first elastic member;
[0046] 520, tension end structural member; 521, first pressure sheet anchor; 522, second pressure bearing plate; 523, second elastic member;
[0047] 600. Escalator. DETAILED DESCRIPTION
[0048] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0049] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0050] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.
[0051] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0053] Combine the following Figures 1 to 12 The utility model is described as a concrete outer tank. Figure 1 It is a partial cross-sectional structural schematic diagram of the concrete outer tank provided by the utility model; Figure 2 It is a schematic diagram of the top view structure of the concrete outer tank provided by the utility model; Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 yes Figure 2 A schematic diagram of the enlarged structure at B in the middle; Figure 5 It is a single anchor node prestressed tendon fixed end node component; Figure 6 It is a large sample of the fixed end node of the prestressed tendon of a single anchor node; Figure 7 It is a single anchor node prestressed tendon tensioning end node component; Figure 8 It is a large sample of the prestressed tendon tensioning end node of a single anchor node; Fig. 9 It is one of the large samples of the fixed end nodes of the prestressed tendons of the group anchor nodes; Fig.10 This is the second sample of the fixed end node of the prestressed tendons of the group anchor node; Fig.11 It is the large sample of the prestressed tendon tensioning end node of the group anchor node; Fig.12 It is a partial cross-sectional structural schematic diagram of the first slow-bonding prestressed tendons of the concrete outer tank of the utility model.
[0054] like Figures 1 to 4 As shown, a specific embodiment of the utility model provides a concrete outer tank. The concrete outer tank comprises an outer tank 100, at least two layers of annular reinforcement components 200 and an axial reinforcement component 300;
[0055] Wherein, the outer tank 100 is a concrete structure;
[0056] At least two layers of annular reinforcement components 200 are arranged along the axial direction of the outer tank 100, and the projection of each layer of annular reinforcement components 200 on the horizontal plane is circular; the annular reinforcement component 200 includes at least two first slow-bonding prestressed tendons, which are arranged in the concrete around the circumference of the outer tank 100, and the fixed end and the tensioning end of the first slow-bonding prestressed tendons form an angle of 180°;
[0057] The axial reinforcement assembly 300 includes at least two second slow-bonding prestressed tendons, which cross the first slow-bonding prestressed tendons and are arranged in the concrete along the axial direction of the outer tank 100 .
[0058] In a specific embodiment of the utility model, at least two layers of annular reinforcement components 200 and axial reinforcement components 300 are arranged in concrete, and the second slow-bonding prestressed tendons are crossed with the first slow-bonding prestressed tendons, and the second slow-bonding prestressed tendons and the first slow-bonding prestressed tendons form a mesh sleeve structure, thereby improving the load-bearing capacity and the safety of use, thereby solving the problem of low safety of use of the existing concrete outer tank.
[0059] Furthermore, the annular reinforcement component 200 includes at least two first slow-bonding prestressed tendons, which are arranged in the concrete around the circumference of the outer tank 100, and the axial reinforcement component 300 includes at least two second slow-bonding prestressed tendons, which are arranged in the concrete along the axial direction of the outer tank 100. There is no need to pass through a corrugated pipe or grouting, which reduces two complex processes and fundamentally solves the problem of water attachment and holes caused by insufficient grouting density in the prior art, thereby improving the stability and safety of the concrete outer tank.
[0060] like Fig.12As shown, in a specific embodiment of the utility model, the structures of the first slow-bonding prestressed tendons and the second slow-bonding prestressed tendons are the same; the first slow-bonding prestressed tendons include an outer sheath 211, a steel strand 212 and a slow-setting adhesive layer 213; the outer sheath 211 is formed with at least two recessed parts around the circumference of the outer sheath 211, and the two recessed parts are arranged along the axial direction of the outer sheath 211; the steel strand 212 is axially arranged in the outer sheath 211, and a slow-setting adhesive layer 213 is arranged between the steel strand 212 and the outer sheath 211. Among them, the slow-setting adhesive layer 213 is formed by curing the slow-setting adhesive. During the construction process, the slow-setting adhesive is not cured, and the steel strand 212 can be freely stretched and deformed. After curing, the slow-setting adhesive becomes the slow-setting adhesive layer 213, so that the recessed part of the outer sheath 211 is engaged with the concrete and works together, which can effectively transmit prestress and improve the bearing capacity and stability of the concrete. In addition, the outer sheath 211 and the slow-setting adhesive layer 213 protect the steel strands 212, thereby preventing the prestressed tendons from being deformed or damaged due to external forces during the construction phase.
[0061] It can be understood that each layer of annular reinforcement assembly 200 includes at least two first slow-bonding prestressed tendons, and the two first slow-bonding prestressed tendons enclose each layer of annular reinforcement assembly 200. The gap between two adjacent layers of annular reinforcement assembly 200 meets the requirements of the concrete outer tank for prestress.
[0062] It can be understood that, along the circumferential direction, the gap between two adjacent second slow-bonding prestressed tendons also meets the requirements of the concrete outer tank for prestress.
[0063] like Figure 2 As shown, in the embodiment of the utility model, the concrete outer tank also includes four or six buttresses 400 and an anchor assembly; the four or six buttresses 400 are formed on the outer side of the outer tank 100, and the buttresses 400 are arranged around the circumference of the outer tank 100; the anchor assembly is arranged on the buttresses 400, and the anchor assembly is connected to the first slow-bonding prestressed tendons for tensioning the first slow-bonding prestressed tendons. By arranging the buttresses 400 on the outer side of the outer tank 100, the construction tensioning of the first slow-bonding prestressed tendons can be realized, the compactness of the concrete is improved, and the safety of use is improved.
[0064] It can be understood that four buttress columns 400 or six buttress columns 400 are evenly arranged on the outer side surface of the outer tank 100 along the circumferential direction.
[0065] In the specific implementation of the present invention, at least one buttress column 400 is arranged between the fixed end and the tensioning end of the same first slow-bonding prestressed tendon, which can further improve the tightness of each layer of the annular reinforcement assembly 200 to the outer tank 100, make the concrete more compact, and improve the safety of use.
[0066] In a specific embodiment of the utility model, the anchor assembly includes a first anchor structure and a second anchor structure; the first anchor structure is connected to the tensioning end of the first slow-bonding prestressed tendon; the second anchor structure is connected to the fixed end of the first slow-bonding prestressed tendon. During the tensioning construction, the second slow-bonding prestressed tendon is tensioned symmetrically at vertical intervals, and the tensioning method is to fix the lower end and tension the upper end. The circumferential tensioning construction needs to be carried out in areas divided according to the elevation. Generally, the circumferential tensioning is carried out layer by layer from the bottom to the top, and it is unfolded along four or six buttresses 400. The first slow-bonding prestressed tendon should be tensioned symmetrically in units of a complete ring. This can ensure that the tensioning of the prestressed tendons is uniform and accurate, and can be adjusted and optimized as needed.
[0067] After the prestressed tendons are tensioned, the exposed steel strands 212 need to be cut. When cutting, the steel strands 212 must be flat and smooth to avoid burrs or damage. Finally, slightly expanded fine stone concrete or non-shrinkage mortar is used for anchoring to ensure the fixing and sealing effect of the prestressed tendons. This can prevent the prestressed tendons from being eroded and damaged by the external environment, ensuring their long-term performance and service life.
[0068] It can be understood that both the tensioning end and the fixed end can be tensioned using a single anchor structure or a group anchor structure. Figure 5 It is a single anchor node prestressed tendon fixed end node component; Figure 6 It is a large sample of the fixed end node of the prestressed tendon of a single anchor node; Figure 7 It is a single anchor node prestressed tendon tensioning end node component; Figure 8 It is a large sample of the prestressed tendon tensioning end node of a single anchor node; Fig. 9 It is one of the large samples of the fixed end nodes of the prestressed tendons of the group anchor nodes; Fig.10 This is the second sample of the fixed end node of the prestressed tendons of the group anchor node; Fig.11 It is the large sample of the prestressed tendon tensioning end node of the group anchor node.
[0069] like Figure 5 , Figure 6 , Fig. 9 and Fig.10 As shown, in some embodiments, the anchor end structural member 510 includes a squeeze anchor 511, a first pressure bearing plate 512 and a first elastic member 513; the squeeze anchor 511 is used to squeeze the fixed ends of multiple first slow-bonding prestressed tendons together, the first pressure bearing plate 512 is located between the squeeze anchor 511 and the first elastic member 513, and the first elastic member 513 is located on the side of the first pressure bearing plate 512 close to the concrete. The first pressure bearing plate 512 plays a pressure-bearing role, and the first elastic member 513 plays a buffering role.
[0070] Further, in some embodiments, the number of the first elastic members 513, the number of the first pressure-bearing plates 512, and the number of the extrusion anchors 511 are equal. Specifically, the number of the first elastic members 513, the first pressure-bearing plates 512, and the extrusion anchors 511 are all one or three.
[0071] Further, in some embodiments, the number of the first elastic member 513 and the number of the first pressure-bearing plate 512 are one, and the number of the extrusion anchors 511 is greater than the number of the first elastic member 513. Specifically, the number of the first elastic member 513 and the number of the first pressure-bearing plate 512 are one, and the number of the extrusion anchors 511 is three.
[0072] It is understandable that in the specific embodiment of the present invention, there is no limitation on the number of the first elastic member 513 , the first pressure-bearing plate 512 and the extrusion anchor 511 .
[0073] like Figure 7 , Figure 8 and Fig.11 As shown, in some embodiments, the tensioning end structural member 520 includes a first clip anchor, a second pressure plate 522 and a second elastic member 523; the second pressure plate 522 is pre-buried in concrete, the first clip anchor is located on the side of the second pressure plate 522 away from the concrete, the second elastic member 523 is located on the side of the second pressure plate 522 facing the concrete, and the tensioning end of the first slow-bonding prestressed tendon passes through the second elastic member 523 and the second pressure plate 522 and is clamped by the first clip anchor. When the tensioning end of the first slow-bonding prestressed tendon passes through the concrete, the first slow-bonding prestressed tendon first passes through the buffering of the second elastic member 523, passes through the second pressure plate 522 buried in the concrete, and is finally clamped by the first clip anchor. The second pressure plate 522 plays a pressure-bearing role, and the second elastic member 523 plays a buffering role.
[0074] In a specific implementation of the present invention, the concrete outer tank further includes an escalator 600 ; the escalator 600 is disposed on the outer side of the outer tank 100 to facilitate personnel to get on and off the outer tank 100 .
[0075] In some embodiments, the first elastic member 513 includes but is not limited to a spiral rib; the second elastic member 523 includes but is not limited to a spiral rib.
[0076] Furthermore, the escalator 600 is a spiral escalator, which further improves the safety of going up and down and improves the safety of using the concrete outer tank.
[0077] In a specific embodiment of the utility model, the concrete outer tank also includes a pedestal; the bottom of the pedestal is buried in the ground, the top of the pedestal is connected to the outer tank 100, and a ventilation space is formed between the bottom surface of the outer tank 100 and the ground, which is beneficial to cooling the concrete outer tank, avoiding excessive local temperature, and improving safety of use.
[0078] Furthermore, the distance between the bottom surface of the outer tank 100 and the ground is 1 to 2 meters, which ensures good heat dissipation and ventilation, and is convenient for people to get on and off, thereby improving safety in use.
[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A concrete outer tank, characterized in that: include: The outer tank (100) is a concrete structure; At least two layers of annular reinforcement components (200) are arranged along the axial direction of the outer tank (100), and the projection of each layer of the annular reinforcement components (200) on the horizontal plane is circular; the annular reinforcement components (200) include at least two first slow-bonding prestressed tendons, the first slow-bonding prestressed tendons are arranged in the concrete around the circumference of the outer tank (100), and the fixed end and the tensioning end of the first slow-bonding prestressed tendons form an angle of 180°; The axial reinforcement assembly (300) comprises at least two second slow-bonding prestressed tendons, wherein the second slow-bonding prestressed tendons cross the first slow-bonding prestressed tendons and are arranged in the concrete along the axial direction of the outer tank (100).
2. The concrete outer tank according to claim 1, characterized in that: Also includes: Four or six buttress columns (400) are formed on the outer side surface of the outer tank (100), and the buttress columns (400) are arranged around the circumference of the outer tank (100); An anchor assembly is arranged on the buttress column (400), and the anchor assembly is connected to the first slow-bonding prestressed tendon and is used for tensioning the first slow-bonding prestressed tendon.
3. The concrete outer tank according to claim 2, characterized in that: The anchor assembly comprises: A tensioning end structural member (520) connected to the tensioning end of the first slow-bonding prestressed tendon; An anchoring end structural member (510) is connected to the fixed end of the first slow-bonding prestressed tendon.
4. The concrete outer tank according to claim 3, characterized in that: At least one buttress column (400) is arranged between the fixed end and the tensioning end of the same first slow-bonding prestressed tendon.
5. The concrete outer tank according to claim 1, characterized in that: Also includes: The escalator (600) is arranged outside the outer tank (100).
6. The concrete outer tank according to claim 5, characterized in that: The escalator (600) is a spiral escalator.
7. The concrete outer tank according to claim 1, characterized in that: Also includes: A support platform, the bottom of which is buried in the ground, the top of which is connected to the outer tank (100), and a ventilation space is formed between the bottom surface of the outer tank (100) and the ground.
8. The concrete outer tank according to claim 7, characterized in that: The distance between the bottom surface of the outer tank (100) and the ground is 1 meter to 2 meters.
9. The concrete outer tank according to any one of claims 1 to 8, characterized in that: The first slow-bonding prestressed tendons and the second slow-bonding prestressed tendons have the same structure; The first slow-bonding prestressed tendons include: An outer sheath (211), with at least two recessed portions (201) formed around the circumference of the outer sheath (211), and the two recessed portions (201) are arranged along the axial direction of the outer sheath (211); The steel strand (212) is axially arranged in the outer sheath (211), and a slow-setting adhesive layer (213) is arranged between the steel strand (212) and the outer sheath (211).
10. A full-containment cryogenic storage tank, characterized in that: It comprises an inner tank and the concrete outer tank according to any one of claims 1 to 9, wherein the inner tank is arranged in the concrete outer tank.