A structural module of a storage tank cylinder, a storage tank cylinder and a manufacturing method thereof

Abstract

The present application provides a structural module of a storage tank cylinder, a storage tank cylinder and a manufacturing method thereof, wherein the structural module comprises an outer steel plate, an inner steel plate and concrete filled between the outer steel plate and the inner steel plate, a connecting rod is buried in the concrete, a first end of the connecting rod is connected to one of the outer steel plate and the inner steel plate through a double self-locking mechanism, a second end of the connecting rod is fixedly connected to the other of the outer steel plate and the inner steel plate, the double self-locking mechanism comprises a first self-locking mechanism for locking the first end of the connecting rod to one of the outer steel plate and the inner steel plate, and a second self-locking mechanism for limiting the movement of the first end of the connecting rod toward its second end to avoid slipping out of the first self-locking mechanism. The structural module of the present application can realize rapid self-locking connection, avoid slipping out, and meet the needs of lightweight, thin-walled, standardized and modular construction of the storage tank cylinder.

Description

Technical Field

[0001] The present application belongs to the technical field of storage tanks, and in particular relates to a structural module of a storage tank cylinder, a storage tank cylinder and a manufacturing method thereof. Background Art

[0002] like Figure 1 and Figure 2 As shown, the storage tank in the prior art includes a cylindrical body 10 and a dome 20 covering the body 10. The body 10 is usually formed by an outer tube and an inner tube, and a hollow cavity is formed between the outer tube and the inner tube. The outer tube wall 11 of the outer tube and the inner tube wall 12 of the inner tube are respectively made of prestressed reinforced concrete. The hollow inner cavity formed between the outer tube wall 11 and the inner tube wall 12 is usually filled with perlite, which has the effect of thermal insulation.

[0003] However, with the increasing requirements for storage capacity of storage tanks, the overall size of storage tanks is also increasing. In the prior art, the storage tank cylinder adopts the traditional prestressed reinforced concrete hollow double-layer wall plus perlite filling structure, which has problems such as excessive thickness of the cylinder structure, increased deadweight, large space occupied, easy surface cracking, and poor overall air tightness. At the same time, the corresponding on-site formwork, steel bar tying, concrete pouring, steel bar prestressing and other construction modes have the shortcomings of complex process and numerous procedures. At the same time, there are also shortcomings such as difficult to control structural quality, low construction efficiency, long construction period and low cost advantage. Therefore, it is urgent to update and iterate the new storage tank structure and its manufacturing method.

[0004] The steel plate-concrete composite structure, also known as the double steel plate concrete composite structure or the double steel plate concrete composite structure, is a new type of building structure that has been continuously developed and improved on the basis of a single reinforced concrete structure and a steel structure. It can comprehensively utilize and give full play to the performance advantages of steel and concrete to achieve the effect of "1+1>2".

[0005] The basic components of the double steel plate concrete composite structure include steel plates, concrete and the connecting components between the two. Generally, the steel plates on the inner and outer sides are connected to the concrete through round head bolts, the so-called shear nails, or other connecting parts. There are no horizontal and vertical steel bars in the concrete, and there are no shear steel bars such as tie bars and stirrups.

[0006] The double steel plate concrete composite structure can give full play to the advantages of both steel plates and concrete. Under the constraints of the inner and outer steel plates, the concrete is under compression on both sides. The constraint effect of the steel plate increases the compressive strength of the concrete, which can further exert its compressive bearing capacity. On the other hand, due to the presence of studs and internal concrete, the steel plate is laterally supported, the stiffness is improved, and compression buckling instability is avoided, and its bending resistance can be exerted.

[0007] As a new type of composite structure, the double steel plate concrete composite structure gives full play to the performance advantages of both steel plates and concrete. Therefore, it can rely on its high bearing capacity, good ductility, strong explosion and impact resistance, good seismic performance and other advantages. In the future, it may be possible to meet the construction needs of large storage tanks with greater loads, higher ductility, stronger impact toughness, faster efficiency and lower costs with smaller wall thickness (material consumption), thereby achieving the construction goal of optimal comprehensive performance in terms of structural mechanics system performance, safety, construction, cost and other aspects.

[0008] However, the existing double steel plate concrete composite structure has the problem of low efficiency when welding its internal connecting parts with the double steel plates. Therefore, it is necessary to make breakthroughs and improvements in how to quickly connect the connecting parts of the double steel plate concrete composite structure with the steel plates, and to ensure the reliability of the connection while quickly connecting to avoid the problem of loosening and disconnection. Summary of the invention

[0009] In view of at least one of the above-mentioned technical problems existing in the prior art, an embodiment of the present application provides a structural module of a storage tank cylinder, a storage tank cylinder and a manufacturing method thereof.

[0010] The technical solution adopted in the embodiment of the present application is: a structural module of a storage tank cylinder, comprising an outer steel plate, an inner steel plate and concrete filled between the outer steel plate and the inner steel plate, a connecting rod is buried in the concrete, a first end of the connecting rod is connected to one of the outer steel plate and the inner steel plate through a double self-locking mechanism, and a second end of the connecting rod is fixedly connected to the other of the outer steel plate and the inner steel plate, wherein the double self-locking mechanism comprises a first self-locking mechanism for locking the first end of the connecting rod to one of the outer steel plate and the inner steel plate, and a second self-locking mechanism for limiting the movement of the first end of the connecting rod toward its second end to avoid slipping out of the first self-locking mechanism.

[0011] In an optional embodiment, the first self-locking mechanism includes an insertion component and a locking component, the insertion component is connected to the first end of the connecting rod, and the radial size of the insertion component gradually increases from one end connected to the connecting rod to the other end thereof, the locking component is arranged on one of the outer steel plate and the inner steel plate, and has a locking cavity for inserting and locking the insertion component therein.

[0012] In an optional embodiment, the insertion component includes a lock head, the lock head is a truncated cone-shaped component, and a concave annular groove is formed at the connection between the lock head and the first end of the connecting rod;

[0013] The lock component includes a lock cylinder, the inner cavity of the lock cylinder forms the locking cavity, and the locking cavity is a truncated cone cavity adapted to the lock head.

[0014] In an optional embodiment, a retractable sliding wedge is provided in the conical cavity. When the lock head is inserted into the conical cavity, the sliding wedge retracts under the pressure of the lock head to expose a space for the lock head to enter. When the lock head completely enters the conical cavity, the sliding wedge extends out and blocks the excess gap between the lock head and the conical cavity, and the periphery of the cavity opening of the conical cavity is stuck in the recessed annular groove.

[0015] In an optional embodiment, the sliding wedge is connected to the bottom of the conical cavity through an elastic component, and the sliding wedge has a first inclined surface and a second inclined surface relative to each other. When the lock head is inserted into the locking cavity, the sliding wedge extends out under the action of the elastic component and is inserted into the surplus gap between the conical cavity and the lock head, and the first inclined surface is tightly fitted with the cavity wall of the locking cavity, and the second inclined surface is tightly fitted with the outer peripheral wall of the lock head.

[0016] In an optional embodiment, the second self-locking mechanism includes a flange and a lock, the flange is provided on the connecting rod near its first end, and the lock is provided on a locking component of the first self-locking mechanism, when the first end of the connecting rod is locked to one of the outer steel plate and the inner steel plate through the first self-locking mechanism, the flange enters into the lock, and the lock locks the flange.

[0017] In an optional embodiment, the flange is a protrusion with a triangular cross section arranged around the outer circumference of the connecting rod;

[0018] The latch comprises a plurality of latch flaps that can be relatively opened and closed, the head of the latch flaps having triangular locking teeth correspondingly locked with the triangular protrusions, the tail of the latch flaps being connected to the locking component and arranged around the cavity opening of the locking cavity;

[0019] When the lock head is inserted into the locking cavity, the plurality of card flaps are deformed and opened under the push of the lock head and the flange. When the lock head enters and is locked in the locking cavity, the flange enters the space surrounded by the plurality of card flaps, and the card flaps close to clamp and lock the flange.

[0020] In an optional embodiment, the outer steel plate and the inner steel plate are each provided with an inclined surface at their periphery for forming a weld bead.

[0021] In an optional embodiment, the outer steel plate and the inner steel plate are each provided with shear nails on the sides facing each other; and / or

[0022] The surfaces of the shear studs on the inner steel plate and the double self-locking mechanism are respectively covered with film sleeves to prevent heat conduction; and / or

[0023] The inner steel plate is coated with a thermal insulation layer on a side facing the concrete.

[0024] A storage tank cylinder comprises a plurality of structural modules according to any of the above embodiments. The plurality of structural modules are spliced ​​in sequence, and a longitudinal weld or a transverse weld is formed between two adjacent structural modules after splicing. The longitudinal weld and the transverse weld are welded respectively to form a weld seam.

[0025] A method for manufacturing the structural module described in any one of the above embodiments, comprising:

[0026] Cut and manufacture the outer and inner steel plates according to the design requirements of the structural modules;

[0027] Prefabricated shear nails and connecting rods are respectively installed on the cut outer steel plates and inner steel plates, wherein different components constituting a double interlocking mechanism are respectively arranged on the first end of the connecting rod and one of the outer steel plate and the inner steel plate, and the second end of the connecting rod is fixed to the other of the outer steel plate and the inner steel plate;

[0028] The outer steel plate and the inner steel plate are placed face to face, and the first end of the connecting rod is plugged and locked with one of the outer steel plate and the inner steel plate through the double-linked self-locking mechanism to form a double-steel plate structural member with an inner cavity;

[0029] Concrete is injected into the inner cavity of the double steel plate structural member and vibrated, and then the concrete is cured to solidify, thereby forming the structural module.

[0030] In an optional embodiment, the different components constituting the double interlocking mechanism are respectively arranged on the first end of the connecting rod and one of the outer steel plate and the inner steel plate, and include:

[0031] A lock head is connected to the first end of the connecting rod, and a flange is arranged on the outer periphery of the connecting rod near its first end; a lock component with a locking cavity is arranged on one of the outer steel plate and the inner steel plate, and a latch surrounding the cavity opening of the locking cavity is arranged on the lock component.

[0032] A method for manufacturing a structural body of a storage tank cylinder, comprising:

[0033] The prepared structural modules as described in any of the above embodiments are hoisted onto the basic platform, and the structural modules are staggered and spliced ​​in sequence according to the design plan, and the inclined surfaces of the peripheral edges of the outer steel plates of two adjacent structural modules are spliced ​​in pairs to form an outer weld bead, and the inclined surfaces of the peripheral edges of the inner steel plates of two adjacent structural modules are spliced ​​in pairs to form an inner weld bead;

[0034] The outer weld bead and the inner weld bead are welded separately to form welds, so that the outer steel plates and the inner steel plates of each of the structural modules constituting the structural body of the tank cylinder are integrated into one, thereby completing the structural body of the tank cylinder having the inner steel plates and the outer steel plates and concrete poured between the inner steel plates and the outer steel plates.

[0035] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0036] 1) The structural module provided by the present application includes an outer steel plate, an inner steel plate, and concrete filled between the outer steel plate and the inner steel plate, and a connecting rod for connecting the outer steel plate and the inner steel plate to each other, transmitting force and limiting position is also buried in the concrete, and a double self-locking mechanism is provided on the connecting rod, and the double self-locking mechanism includes a first self-locking mechanism and a second self-locking mechanism, so as to construct the structural main body of the storage tank cylinder, which can meet the needs of lightweight, thin-walled, standardized and modular construction of the structural main body of the storage tank cylinder, fill the gap in the prior art, can effectively improve work efficiency, and meet the development needs of rapid construction and factory construction of storage tanks;

[0037] 2) The structural module provided in the present application has an insulation layer applied on the side of the inner steel plate facing the concrete, thereby effectively blocking heat conduction. When the constructed storage tank is used to store low-temperature media, the concrete layer and the outer steel plate are protected from the ultra-low temperature inside the cylinder, thereby improving the insulation performance and durability of the structural body of the storage tank cylinder, thereby better ensuring the safe operation of, for example, a vertical LNG storage tank;

[0038] 3) The structural module provided by the present application has a connecting rod with a double self-locking mechanism buried in the concrete for connecting the outer steel plate and the inner steel plate to each other, transmitting force and limiting position, so as to ensure the tension between the outer steel plate and the inner steel plate, ensure the stability of the concrete structure layer, and greatly improve the bearing capacity of the structural module. The connecting rod adopts a double self-locking mechanism consisting of a first self-locking mechanism and a second self-locking mechanism to quickly self-lock the outer steel plate and the inner steel plate, thereby overcoming the defects of poor integrity of the cylinder structure and low construction efficiency caused by the connection between the connecting piece and the inner and outer steel plates through hole welding or bolts in the double steel plate concrete composite structure, and the inner and outer steel plates can transfer heat to each other, and the overall thermal insulation performance of the cylinder is poor, or the self-locking ability of a single self-locking mechanism is not strong, and the problem of being pulled out and slipped during concrete pouring and vibration operations may occur, thereby ensuring the effectiveness of the connecting rod in the structural module;

[0039] 4) The structural module provided by the present application is extremely novel and unique in conception. Not only can the inner steel plate on the side facing the concrete be coated with an insulation layer to effectively block the heat transfer inside and outside the structural module, but also the shear nails, especially the connecting rods with double self-locking capability, can ensure the mutual connection, locking, force transmission and limit functions between the outer steel plate and the inner steel plate, and ensure the integrity and bearing capacity of the structural module, so as to perfectly realize the structural module's high bearing capacity, good stability and ductility, strong explosion and impact resistance, good seismic performance and other characteristics. Therefore, it is of great value for promotion and application;

[0040] 5) The method provided in this application for manufacturing the structural body of the storage tank cylinder using the above-mentioned structural module is simple, standardized, fast, complete, and highly operable. It can adapt to the development needs of rapid construction or factory construction of storage tanks. Therefore, it is also extremely practical and has promotion and application value.

[0041] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

[0042] The overview of various implementations or examples of the technology described in this application is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, serve to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0044] Figure 1 It is a schematic diagram of the three-dimensional structure of a storage tank in the prior art.

[0045] Figure 2 It is a schematic diagram of the cross-sectional structure of the cylinder wall in the prior art.

[0046] Figure 3 It is a schematic three-dimensional structure diagram of the structural module of the storage tank cylinder according to an embodiment of the present application.

[0047] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the structural module of an embodiment of the present application.

[0048] Figures 5 to 7 They are respectively schematic cross-sectional structures of the double-linked self-locking mechanism of the embodiments of the present application, wherein the lock head is in different insertion positions.

[0049] Figure 8 and Fig. 9 They are schematic diagrams of three-dimensional structures of different styles when the structural modules of the embodiments of the present application are spliced ​​with each other.

[0050] Fig.10 This is a schematic diagram of the cross-sectional structure of multiple structural modules of an embodiment of the present application after being horizontally connected, wherein the outer steel plate and the inner steel plate are both planar.

[0051] Fig.11 This is a schematic diagram of the cross-sectional structure of multiple structural modules of an embodiment of the present application after being horizontally connected, wherein the outer steel plate and the inner steel plate are both in the shape of curved surfaces.

[0052] Fig.12 This is a front view of the storage tank according to an embodiment of the present application.

[0053] Reference numerals:

[0054] 10- cylinder body; 11- outer cylinder wall; 12- inner cylinder wall; 13- concrete; 20- dome;

[0055] 100-structural module; 110-outer steel plate; 120-inner steel plate; 101-inclined surface; 102-weld; 130-concrete; 140-shear nail; 150-insulation layer; 160-connecting rod; 171-locking head; 1711-recessed ring groove; 172-locking cylinder; 1721-locking cavity; 173-sliding wedge; 174-elastic component; 175-flange; 176-valve; 1761-locking tooth; 177-membrane sleeve. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiment of the present application clearer, the technical solution of the embodiment of the present application will be clearly and completely described in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0058] In order to keep the following description of the embodiments of the present application clear and concise, the present application omits detailed descriptions of known functions and known components.

[0059] The embodiment of the present application provides a structural module 100 for constructing a cylinder of a storage tank, wherein the storage tank can be used to store liquid or gas.

[0060] like Figure 3 and Figure 4 As shown, the structural module 100 of the present application includes an outer steel plate 110, an inner steel plate 120 and concrete 130 filled between the outer steel plate 110 and the inner steel plate 120. A connecting rod 160 is embedded in the concrete 130, and the first end of the connecting rod 160 is connected to one of the outer steel plate 110 and the inner steel plate 120 through a double self-locking mechanism, and the second end of the connecting rod 160 is fixedly connected to the other of the outer steel plate 110 and the inner steel plate 120, wherein the double self-locking mechanism includes a first self-locking mechanism for locking the first end of the connecting rod 160 on one of the outer steel plate 110 and the inner steel plate 120, and a second self-locking mechanism for limiting the first end of the connecting rod 160 from moving toward the second end thereof to avoid being pulled out and slipped from the first self-locking mechanism. The connecting rod 160 embedded in the concrete 130 is used for mutual connection, force transmission and position limiting between the outer steel plate 110 and the inner steel plate 120.

[0061] The first end of the connecting rod 160 in the structural module 100 of the embodiment of the present application is quickly self-locked connected to one of the outer steel plate 110 and the inner steel plate 120 through a double self-locking mechanism, thereby improving the assembly efficiency; moreover, the connection through the double self-locking mechanism also overcomes the defects of poor structural integrity and low construction efficiency in the existing double steel plate concrete 130 combined structure caused by the connection between the connecting parts and the inner and outer steel plates 110 through open hole welding or bolts; the double self-locking mechanism has a strong self-locking ability, and there will be no problem of pulling out and slipping during the pouring and vibration operations of the concrete 130, thereby ensuring the effectiveness of the connecting rod 160 in the structural module 100. In addition, the structural module 100 of the present application adopts a double steel plate concrete 130 structure, which has high bearing capacity, good ductility, excellent seismic resistance and excellent impact resistance, and can withstand large-intensity explosion and impact forces; in addition, the structural form of the external steel plates on both sides allows it to serve as a template for pouring internal concrete 130, which can realize standardized prefabrication and assembly construction of double steel plate concrete 130 components, greatly improving construction efficiency.

[0062] It is understandable that the double-linked self-locking mechanism can be provided between the connecting rod 160 and the outer steel plate 110, or between the connecting rod 160 and the inner steel plate 120. For the convenience of description, the following description will take the connection between the connecting rod 160 and the inner steel plate 120 using the double-linked self-locking mechanism as an example, and the connecting rod 160 and the outer steel plate 110 are fixedly connected by, for example, welding.

[0063] In some embodiments, Figures 4 to 7 As shown, the first self-locking mechanism includes an insertion component and a locking component. The insertion component is connected to the first end of the connecting rod 160, and the radial dimension of the insertion component gradually increases from the end connected to the connecting rod 160 to the other end. The locking component is arranged on the side of the inner steel plate 120 facing the concrete 130 (i.e., the inner side of the inner steel plate 120), and has a locking cavity 1721 for inserting and locking the insertion component therein. The first self-locking mechanism has a simple and reasonable structure, is easy to manufacture, and has a good self-locking effect. It can be understood that the so-called radial dimension of the lock head 171 refers to the dimension of the lock head 171 perpendicular to the direction in which it is inserted into the locking cavity 1721.

[0064] Furthermore, the locking component includes a lock cylinder 172 capable of locking the lock head 171, and the inner cavity of the lock cylinder 172 forms a locking cavity 1721. In order to achieve a good locking relationship, the insertion component includes a lock head 171, and the lock head 171 can be a truncated cone-shaped component, and the periphery of the truncated cone bottom of the truncated cone-shaped component can be arc-shaped, so that the lock head 171 can be smoothly inserted into the locking cavity 1721. The outer diameter of the free end of the lock head 171 is larger than the outer diameter of the end connected to the connecting rod 160, so that a concave annular groove 1711 is formed at the connection between the lock head 171 and the first end of the connecting rod 160. The locking cavity 1721 is a truncated cone cavity adapted to the lock head 171 to facilitate locking.

[0065] In an optional embodiment, if Figures 5 to 7 As shown, the shape of the locking cavity 1721 is the same as that of the lock head 171 but is larger than the lock head 171, so that when the lock head 171 is inserted into the locking cavity 1721, an annular surplus gap is formed between the peripheral side of the lock head 171 and the cavity wall of the locking cavity 1721. A retractable sliding wedge 173 is provided in the truncated cone cavity. When the lock head 171 is inserted into the truncated cone cavity, the sliding wedge 173 retreats under the pressure of the lock head 171, exposing a space for the lock head 171 to enter (see Figure 5 ), when the lock head 171 continues to be inserted, the sliding wedge 173 gradually extends (see Figure 6 ), and after the lock head 171 completely enters the truncated cone cavity, the sliding wedge 173 is completely extended to block the surplus gap between the lock head 171 and the truncated cone cavity (see Figure 7 ), that is, the sliding wedge 173 is wedged between the lock head 171 and the lock cylinder 172. By setting the sliding wedge 173, the locking degree of the lock cylinder 172 on the lock head 171 can be improved, and the locking effect is better.

[0066] The sliding wedge 173 is a structure that can be extended and retracted under the push of the lock head 171 when it is inserted. The sliding wedge 173 itself can be elastically deformed and has a certain hardness. When the lock head 171 is inserted, it can push the sliding wedge 173 to retreat and be compressed in the locking cavity 1721. When the lock head 171 is inserted in place, the sliding wedge 173 recovers its deformation and is inserted into the surplus gap. Alternatively, the sliding wedge 173 itself cannot be deformed. The sliding wedge 173 is set in the truncated cone cavity through the elastic component 174. When the lock head 171 is inserted, the sliding wedge 173 is pushed back and the elastic component 174 is compressed. When the lock head 171 is inserted in place, the elastic component 174 stretches and recovers and pushes the sliding wedge 173 to extend and insert into the surplus gap.

[0067] In some embodiments, Figures 5 to 7As shown, the sliding wedge 173 is connected to the bottom of the conical cavity through the elastic component 174. The sliding wedge 173 has a first inclined surface and a second inclined surface that are opposite to each other. When the lock head 171 is inserted into the conical cavity, the sliding wedge 173 is extended by the elastic component 174 and inserted into the surplus space between the conical cavity and the lock head 171. The first inclined surface is tightly fitted with the cavity wall of the conical cavity, and the second inclined surface is tightly fitted with the outer wall of the lock head 171. By providing the first inclined surface and the second inclined surface, it is convenient for the sliding wedge 173 to wedge the surplus space between the conical cavity and the lock head 171, thereby preventing the lock head 171 from loosening. Moreover, during the process of inserting the lock head 171 into the conical cavity, the first inclined surface sticks to the cavity wall of the conical cavity and slides along it (see Figure 6 ), which is beneficial for the sliding wedge 173 to accurately slide into the surplus gap.

[0068] like Figures 5 to 7 As shown, the lock cylinder 172 can be a structure with both ends open, so that the locking cavity 1721 forms a through cavity, that is, the locking cavity 1721 is a structure without a cavity bottom, one end of the lock cylinder 172 is directly fixed to the inner side of the inner steel plate 120, and the inner steel plate 120 blocks the open end of the lock cylinder 172. In this structural form, one end of the elastic component 174 can be directly connected to the inner steel plate 120. The other end of the elastic component 174 is connected to the large end of the sliding wedge 173, and the small end of the sliding wedge 173 is an insertion end for inserting into the surplus gap.

[0069] It can be understood that the elastic component 174 between the sliding wedge 173 and the inner steel plate 120 can be an elastic column, an elastic tube or a spring, etc., and the specific form is not limited in this embodiment.

[0070] Since the surplus gap is an annular gap, at least two sliding wedges 173 are provided, and at least two sliding wedges 173 are arranged at intervals (preferably evenly arranged) to be inserted into the surplus gap from different positions, thereby ensuring that the lock head 171 is stably locked in the locking cavity 1721.

[0071] In order to facilitate the setting of the elastic component 174 and to facilitate guiding the lock head 171 to be inserted into the locking cavity 1721, the cylinder cavity of the lock cylinder 172 also includes a guide cavity and a accommodating cavity, which are respectively located on opposite sides of the locking cavity 1721 and connected with the locking cavity 1721. The guide cavity and the accommodating cavity are both cylindrical cavities. The guide cavity is away from the inner steel plate 120 and is located at the front end of the lock cylinder 172. One end of the guide cavity is connected to the small-diameter end of the locking cavity 1721. The cavity diameter of the locking cavity 1721 gradually increases from the end connected to the guide cavity to the end connected to the accommodating cavity to form a truncated cone shape. The cavity diameter of the accommodating cavity is larger than the cavity diameter of the large-diameter end of the locking cavity 1721 to accommodate the elastic component 174.

[0072] Continue to combine Figures 5 to 7The second self-locking mechanism includes a flange 175 and a lock. The flange 175 is arranged near the first end of the connecting rod 160 and is farther away from the inner steel plate 120 than the lock head 171. The lock is arranged on the lock component (lock cylinder 172) of the first self-locking mechanism. When the first end of the connecting rod 160 is locked to the side of the inner steel plate 120 facing the concrete 130 through the first self-locking mechanism, the flange 175 enters the lock, and the lock locks the flange 175. The second self-locking mechanism is simple and reasonable, and can cooperate with the first self-locking mechanism to realize double locking of the connecting rod 160, and the locking effect is good.

[0073] In some embodiments, the flange 175 may be a protrusion with a triangular cross section arranged around the outer circumference of the connecting rod 160. The latch includes a plurality of flaps 176 that can be relatively opened and closed. The head of the flap 176 has a triangular locking tooth 1761 corresponding to the triangular protrusion. The tail of the flap 176 is connected to the lock cylinder 172 and is arranged around the cavity opening of the locking cavity 1721. When the lock head 171 is inserted into the locking cavity 1721, the plurality of flaps 176 are deformed and opened under the push of the lock head 171 and the flange 175. When the lock head 171 enters and is locked in the locking cavity 1721, the flange 175 enters the space surrounded by the plurality of flaps 176, and the flaps 176 are closed to lock the protrusion.

[0074] The clamping flap 176 is actually an elastic arm with a triangular locking tooth 1761 at the head (the end of the free end), which can be opened and closed. When opened, a channel is formed to allow the protrusion to pass through. When closed, the channel is reduced and the protrusion is tightly clamped and clamped on the side of the protrusion away from the lock head 171, restricting the connecting rod 160 from slipping out toward the side away from the lock head 171. The number of the clamping flaps 176 is preferably 3 to 6.

[0075] The double self-locking mechanism provided in the embodiment of the present application not only overcomes the defects of poor integrity of the cylinder structure and low construction efficiency caused by the connection between the connecting piece and the inner and outer steel plates 110 through hole welding or bolts in the existing double steel plate concrete 130 combined structure, but also overcomes the shortcomings of the shear connection piece formed by a single self-locking mechanism, which has weak self-locking ability and may be pulled out and slipped during the pouring and vibration of the concrete 130, thereby ensuring the effectiveness of the connecting rod 160 in the structural module 100; and the double self-locking mechanism in the embodiment of the present application is designed The design is ingenious, the first self-locking mechanism and the second self-locking mechanism are naturally connected, they are independent of each other, and are interrelated, and only need to push the connecting rod 160 to complete the locking of the two self-locking mechanisms. When the structural module 100 is pouring concrete 130 and after the concrete 130 is solidified, the concrete 130 with a certain viscosity and strength can limit the outward expansion space of the second self-locking mechanism and its flap 176. Therefore, even if the connecting rod 160 is under the action of a large external force, its double self-locking mechanism will not slide out and disengage, thereby ensuring the safety of the connection structure.

[0076] Optionally, the structural module 100 can be a square block with a side length of 3 to 10 m, or a rectangular block with a length of 3 to 10 m and a width of 1 to 3 m, or a curved surface block with a height of 1 to 3 m and an outer arc length of 3 to 10 m, and the thickness of the square block, the rectangular block, or the curved surface block is 0.2 to 1 m.

[0077] When the structural module 100 is a square block or a rectangular block, the inner steel plate 120 and the outer steel plate 110 of the structural module 100 are both planar, and the outer side surface and the inner side surface of the plurality of structural modules 100 after being spliced ​​are also planar, see Fig.10 When the structural module 100 is an arc-shaped block, the inner steel plate 120 and the outer steel plate 110 of the structural module 100 are both arc-shaped, and the outer and inner sides of the multiple structural modules 100 after splicing are also arc-shaped, see Fig.11 .

[0078] A plurality of shear nails 140 are respectively arranged on the sides facing each other of the outer steel plate 110 and the inner steel plate 120; the distance between the shear nails 140 is 0.1-0.5 m, and the shear nails 140 on the sides facing each other of the outer steel plate 110 and the inner steel plate 120 are staggered.

[0079] Optionally, the shear nails 140 and the connecting rods 160 are both steel components. The steel shear nails 140 and the connecting rods 160 have good structural strength, good bonding with the concrete 130, and are convenient to connect with the inner steel plate 120 and the outer steel plate 110. For example, the steel shear nails 140 and the connecting rods 160 can be firmly welded to the inner steel plate 120 and the outer steel plate 110 by welding.

[0080] Optional, such as Figures 3 to 7 As shown, the inner steel plate 120 is coated with an insulation layer 150 on the side facing the concrete 130. The insulation layer 150 can be sprayed with modified polyurethane. When the storage tank body constructed using the structural module 100 of the present application is used to store ultra-low temperature media, such as LNG, liquid nitrogen, liquid helium, liquid ammonia, hydrocarbons, etc., the insulation layer 150 can effectively block heat conduction, protect the concrete 130 layer and the outer steel plate 110 from the ultra-low temperature inside the storage tank body, and improve the insulation performance and durability of the structural body of the storage tank body, so as to better ensure the safe operation of the storage tank.

[0081] When the lock cylinder 172 is disposed on the side of the inner steel plate 120 facing the concrete 130, and the insulation layer 150 is disposed on the side of the inner steel plate 120, the insulation layer 150 avoids the lock cylinder 172, that is, the lock cylinder 172 is still connected to the inner steel plate 120, but not to the insulation layer 150, see Figures 4 to 7 .

[0082] Optionally, the shear pins 140 on the inner steel plate 120 and the surface of the double self-locking mechanism are respectively covered with a film sleeve 177 to prevent heat conduction.

[0083] The membrane sleeve 177 may be a fiber-reinforced composite membrane sleeve 177. The fiber-reinforced composite membrane sleeve 177 is formed by mixing at least one of glass fiber, carbon fiber, and aramid fiber with a bonding matrix material and then undergoing at least one of winding, molding, or pultrusion processes.

[0084] Fiber reinforced polymer (FRP) is a composite material formed by winding, molding or pultrusion of reinforcing fiber materials such as glass fiber, carbon fiber, aramid fiber and matrix materials. FRP, as an anti-corrosion and heat-insulating material, is coated on the steel shear nail 140, one end of the steel connecting rod 160 and the surface of the double self-locking mechanism, which can effectively block the heat conduction on the steel shear nail 140 and the steel connecting rod 160. When the storage tank stores ultra-low temperature medium (substance), if there is leakage inside, it can effectively prevent the leaked ultra-low temperature medium from transmitting the ultra-low temperature to the inside of the structural module 100 through the steel shear nail 140 and the surface of the steel double self-locking mechanism, so as to avoid affecting the structural stress performance of the main body of the cylinder structure of the storage tank and avoid corresponding damage and loss.

[0085] The structural module 100 provided in the embodiment of the present application includes an outer steel plate 110, an inner steel plate 120, and concrete 130 filled between the outer steel plate 110 and the inner steel plate 120, and the outer steel plate 110 and the inner steel plate 120 are each provided with an inclined surface 101 for forming a weld bead on their respective peripheries, and the inner and outer steel plates 110 are each provided with a shear nail 140 on the side facing each other, and the inner steel plate 120 is coated with an insulation layer 150 on the side facing the concrete 130, and a heat preservation layer 150 is buried in the concrete 130 for the outer steel plate 110 and the inner steel plate 120. The side steel plates 120 are connected to each other, and the connecting rod 160 for transmitting force and limiting position is provided with a double self-locking mechanism, and the double self-locking mechanism includes a first self-locking mechanism with a lock head 171 and a lock cylinder 172 and a second self-locking mechanism including a flange 175 and a lock. The structural body of the storage tank cylinder constructed with this structural module 100 can meet the development needs of lightweight, thin-walled, standardized, modular construction of the structural body of the storage tank cylinder, and effectively improve work efficiency, rapid construction, and factory construction, filling the gap in the prior art;

[0086] Since the structural module 100 provided in this embodiment has steel plates on both the inner and outer sides, and shear nails 140 are distributed on the inner and outer steel plates respectively, the anchoring force and bonding force between the steel plates on both sides and the filling concrete 130 can be greatly enhanced, so that they can form a perfect whole. When used to construct the structural body of the storage tank cylinder, the crack resistance and durability of the outer wall of the structural body of the storage tank cylinder can be greatly improved;

[0087] The concrete 130 filled between the outer steel plate 110 and the inner steel plate 120 plays a role in structural support and load bearing. The presence of the inner and outer steel plates constrains the filled concrete 130, thereby greatly improving the bearing capacity of the concrete 130. The steel plates on both sides are laterally supported by the concrete 130, and the rigidity is improved to avoid buckling instability, and the bending resistance is fully exerted.

[0088] In addition, in the structural module 100 provided in the present embodiment, the inner steel plate 120 is coated with a thermal insulation layer 150 on the side facing the concrete 130, so that heat conduction can be effectively blocked, and the concrete 130 layer and the outer steel plate 110 can be protected from the ultra-low temperature inside the cylinder, thereby improving the thermal insulation performance and durability of the cylinder structure of the storage tank. In particular, when the storage tank is a vertical LNG storage tank and the LNG inside the cylinder leaks, it can effectively block cold and prevent the ultra-low temperature from continuing to be transmitted to the external structure of the cylinder of the LNG storage tank, thereby better ensuring the safe operation of the vertical LNG storage tank.

[0089] Moreover, in the structural module 100 provided in this embodiment, a connecting rod 160 is buried in the concrete 130, which can be used to connect the outer steel plate 110 and the inner steel plate 120, transmit force and limit position, thereby ensuring the tension between the outer steel plate 110 and the inner steel plate 120, further ensuring the stability of the structural layer of the concrete 130, and greatly improving the bearing capacity of the structural module 100;

[0090] Moreover, the connecting rod 160 adopts a double self-locking mechanism consisting of a first self-locking mechanism and a second self-locking mechanism. The double self-locking mechanism can realize a quick, effective and firm self-locking connection between the outer steel plate 110 and the inner steel plate 120, thereby overcoming the defects of the double steel plate concrete 130 combined structure, such as poor integrity of the cylinder structure, low construction efficiency, mutual heat transfer between the inner and outer steel plates 110, and poor overall thermal insulation performance of the cylinder, etc., caused by the connection between the connecting parts and the inner and outer steel plates 110 through hole welding or bolts, or the single self-locking mechanism has a weak self-locking ability, which may cause the problem of pull-out and slipping during the pouring and vibration of the concrete 130. Therefore, a new structural module 100 is proposed that can meet the requirements of the main body of the cylinder structure of a large vertical LNG storage tank with a larger load, higher ductility, stronger impact toughness, faster efficiency and lower cost, thereby achieving the construction goal of optimizing the comprehensive performance of the vertical LNG storage tank structural mechanical system performance, safety, construction, cost and other aspects.

[0091] The embodiment of the present application also provides a storage tank cylinder, which includes a plurality of structural modules 100 in any of the above embodiments, and the plurality of structural modules 100 are spliced ​​in sequence.

[0092] Optionally, the outer steel plate 110 and the inner steel plate 120 are each provided with an inclined surface 101 for forming a weld bead on their respective peripheries. When the structural modules 100 are spliced ​​together to construct the storage tank body, the inclined surfaces 101 of the inner steel plates 120 of two adjacent structural modules 100 are spliced ​​together to form a weld bead (the weld bead includes a transverse weld bead extending in the transverse direction and a vertical weld bead along the vertical color), and the inclined surfaces 101 of the outer steel plates 110 of two adjacent structural modules 100 are spliced ​​together to form a weld bead (the weld bead includes a transverse weld bead extending in the transverse direction and a vertical weld bead along the vertical color). The weld bead is welded to form a weld seam 102, see Fig.10 and Fig.11 , so that the outer steel plate 110 and the inner steel plate 120 of each structural module 100 are respectively integrated.

[0093] The embodiment of the present application also provides a method for manufacturing a structural module 100, including:

[0094] The outer steel plates 110 and the inner steel plates 120 are cut and manufactured according to the design requirements of the structural module 100, and the peripheries of the outer steel plates 110 and the inner steel plates 120 are inclined surfaces 101 respectively; taking the construction of a vertical LNG storage tank as an example, the steel plates can be cut on the open space at the construction site of the vertical LNG storage tank or in the workplace of the prefabricated parts production enterprise;

[0095] Prefabricated shear nails 140 are respectively installed on the cut outer steel plates 110 and inner steel plates 120, and different components constituting a double interlocking mechanism are respectively arranged on the first end of the connecting rod 160 and one of the outer steel plate 110 and the inner steel plate 120, and the second end of the connecting rod 160 is fixed to the other of the outer steel plate 110 and the inner steel plate 120, for example, the second end of the connecting rod 160 is fixed to the outer steel plate 110;

[0096] A heat-insulating layer 150 is applied on one side of the inner steel plate 120; if the storage tank is constructed to store materials at room temperature, the step of applying the heat-insulating layer 150 can be omitted;

[0097] The outer steel plate 110 with the shear nails 140 and the connecting rod 160 is faced to the inner steel plate 120 coated with the insulation layer 150, and the first end of the connecting rod 160 is plugged and locked with the inner steel plate 120 through a double self-locking mechanism to form a double steel plate structure with an inner cavity;

[0098] Concrete 130 is injected into the inner cavity of the double steel plate structural member and vibrated, and then the concrete 130 is cured to solidify, thereby forming the structural module 100 .

[0099] Furthermore, the different components constituting the double interlocking mechanism respectively arranged on the first end of the connecting rod 160 and one of the outer steel plate 110 and the inner steel plate 120 include:

[0100] A locking head 171 is connected to the first end of the connecting rod 160, and the connecting head protrudes from the first end of the connecting rod 160 along the axial direction of the connecting rod 160, and a flange 175 is arranged on the outer periphery of the connecting rod 160 near its first end, and a locking cylinder 172 with a locking cavity 1721 is arranged on one of the outer steel plate 110 and the inner steel plate 120, and a latch surrounding the cavity opening of the locking cavity 1721 is arranged on the lock cylinder 172; wherein, when the second end of the connecting rod 160 is fixed to the other of the outer steel plate 110 and the inner steel plate 120, and the outer steel plate 110 and the inner steel plate 120 are aligned facing each other, the locking head 171 is opposite to the cavity opening of the locking cavity 1721, so that the locking head 171 can be smoothly inserted into the locking cavity 1721.

[0101] The present application embodiment discloses a method for manufacturing a structural body of a storage tank cylinder, comprising:

[0102] The prepared structural module 100 as in any of the above embodiments is hoisted onto the base platform, and the structural modules 100 are sequentially spliced ​​according to the design plan, so that Figure 8 The structural modules 100 between two adjacent rows are relatively spliced ​​as shown in FIG. Fig. 9 As shown in the figure, the structural modules 100 between the two adjacent rows are staggered and spliced; the inclined surfaces 101 of the peripheral edges of the outer steel plates 110 of the two adjacent structural modules 100 are spliced ​​in pairs to form the outer weld bead (the outer weld bead includes the transverse outer weld bead and the longitudinal outer weld bead), and the inclined surfaces 101 of the peripheral edges of the inner steel plates 120 of the two adjacent structural modules 100 are spliced ​​in pairs to form the inner weld bead (the inner weld bead includes the transverse inner weld bead and the longitudinal inner weld bead);

[0103] The outer weld bead and the inner weld bead are welded separately to form a weld 102, so that the outer steel plates 110 and the inner steel plates 120 of each structural module 100 constituting the tank body are integrated into one, thereby completing the structural body of the tank body having the inner steel plate 120 and the outer steel plate 110 and concrete 130 poured between the inner steel plate 120 and the outer steel plate 110.

[0104] Through the manufacturing method of the embodiment of the present application, the structural main body of the tank cylinder can be lightweight, thin-walled, and the structural module 100 required for standardized and modular construction can be obtained, which effectively improves work efficiency, meets the development needs of rapid construction and factory-based construction of tanks, and fills the gap in the prior art; and through the construction steps of the tank cylinder structural main body, the structural main body of the tank cylinder can be perfectly constructed using the above-mentioned structural module 100, and its construction and manufacturing process is simple, convenient, and fast, which can meet the standardized operation requirements and adapt to the development needs of rapid construction or factory-based construction of tanks. Therefore, it is very practical and has promotion and application value.

[0105] The storage tank cylinder involved in the present application refers to a container for storing liquid or gas, such as various types of storage tank cylinders including chemical storage tanks, petroleum storage tanks, liquefied gas and other low-temperature medium storage tanks.

[0106] The structural body of the tank cylinder constructed using the structural module 100 of the present application can perfectly realize the requirements of the vertical LNG storage tank whose cylinder structure body needs to meet the characteristics of high bearing capacity, good stability and ductility, strong explosion and impact resistance, and good seismic resistance; it is also convenient to meet the needs of lightweight, thin-walled, standardized and modular construction of the cylinder structure body of the vertical LNG storage tank, improve the thermal insulation performance and durability of the cylinder structure body of the vertical LNG storage tank, adapt to the development needs of rapid construction and factory construction of vertical LNG storage tanks, and fill the gap in the existing technology in this field.

[0107] The above description is intended to be illustrative rather than restrictive, and those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of them) may be used in combination with each other, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations.

Claims

1. A structural module of a storage tank cylinder, characterized in that: It comprises an outer steel plate, an inner steel plate and concrete filled between the outer steel plate and the inner steel plate, a connecting rod is buried in the concrete, a first end of the connecting rod is connected to one of the outer steel plate and the inner steel plate through a double self-locking mechanism, and a second end of the connecting rod is fixedly connected to the other of the outer steel plate and the inner steel plate, wherein the double self-locking mechanism comprises a first self-locking mechanism for locking the first end of the connecting rod on one of the outer steel plate and the inner steel plate, and a second self-locking mechanism for limiting the movement of the first end of the connecting rod toward the second end thereof to avoid being pulled out and slipping from the first self-locking mechanism; The first self-locking mechanism includes an insertion component and a locking component, wherein the insertion component is connected to the first end of the connecting rod, and the radial dimension of the insertion component gradually increases from the end connected to the connecting rod to the other end thereof, and the locking component is provided on one of the outer steel plate and the inner steel plate, and has a locking cavity for inserting and locking the insertion component therein; The inserting component comprises a lock head, which is a truncated cone-shaped component, and a concave annular groove is formed at the connection between the lock head and the first end of the connecting rod; The lock component comprises a lock cylinder, the inner cavity of which forms the locking cavity, and the locking cavity is a frustum cavity adapted to the lock head; The second self-locking mechanism includes a flange and a lock, the flange is arranged on the connecting rod near its first end, and the lock is arranged on the locking component of the first self-locking mechanism. When the first end of the connecting rod is locked to one of the outer steel plate and the inner steel plate through the first self-locking mechanism, the flange enters the lock, and the lock locks the flange.

2. The structural module according to claim 1, characterized in that: A retractable sliding wedge is provided in the conical cavity. When the lock head is inserted into the conical cavity, the sliding wedge retreats under the pressure of the lock head to expose a space for the lock head to enter. When the lock head completely enters the conical cavity, the sliding wedge extends out and blocks the surplus gap between the lock head and the conical cavity, and the periphery of the cavity opening of the conical cavity is stuck in the recessed annular groove.

3. The structural module according to claim 2, characterized in that: The sliding wedge is connected to the bottom of the conical cavity through an elastic component, and the sliding wedge has a first inclined surface and a second inclined surface opposite to each other. When the lock head is inserted into the locking cavity, the sliding wedge extends out under the action of the elastic component and is inserted into the surplus gap between the conical cavity and the lock head, and the first inclined surface is tightly fitted with the cavity wall of the locking cavity, and the second inclined surface is tightly fitted with the outer peripheral wall of the lock head.

4. The structural module according to claim 1, characterized in that: The flange is a protrusion with a triangular cross section arranged around the outer circumference of the connecting rod; The latch comprises a plurality of latch flaps that can be relatively opened and closed, the head of the latch flaps having triangular locking teeth correspondingly locked with the triangular protrusions, the tail of the latch flaps being connected to the locking component and arranged around the cavity opening of the locking cavity; When the lock head is inserted into the locking cavity, the plurality of card flaps are deformed and opened under the push of the lock head and the flange. When the lock head enters and is locked in the locking cavity, the flange enters the space surrounded by the plurality of card flaps, and the card flaps close to clamp and lock the flange.

5. The structural module according to claim 1, characterized in that: The outer steel plate and the inner steel plate are each provided with an inclined surface for forming a weld bead at their respective peripheries.

6. The structural module according to claim 1, characterized in that: The outer steel plate and the inner steel plate are each provided with a shear nail on one side facing the other side; and / or The surfaces of the shear studs on the inner steel plate and the double self-locking mechanism are respectively covered with film sleeves to prevent heat conduction; and / or The inner steel plate is coated with a thermal insulation layer on a side facing the concrete.

7. A storage tank cylinder, characterized in that: It comprises a plurality of structural modules according to any one of claims 1 to 6, wherein the plurality of structural modules are spliced ​​in sequence, a longitudinal weld or a transverse weld is formed between two adjacent structural modules after splicing, and the longitudinal weld and the transverse weld are welded respectively to form a weld seam.

8. A method for manufacturing a structural module according to any one of claims 1 to 6, characterized in that: include: Cut and manufacture the outer and inner steel plates according to the design requirements of the structural modules; Prefabricated shear nails and connecting rods are respectively installed on the cut outer steel plates and inner steel plates, wherein different components constituting a double interlocking mechanism are respectively arranged on the first end of the connecting rod and one of the outer steel plate and the inner steel plate, and the second end of the connecting rod is fixed to the other of the outer steel plate and the inner steel plate; The outer steel plate and the inner steel plate are placed face to face, and the first end of the connecting rod is plugged and locked with one of the outer steel plate and the inner steel plate through the double-linked self-locking mechanism to form a double-steel plate structural member with an inner cavity; Concrete is injected into the inner cavity of the double steel plate structural member and vibrated, and then the concrete is cured to solidify, thereby forming the structural module.

9. The method for manufacturing a structural module according to claim 8, characterized in that: The different components constituting the double interlocking mechanism are respectively arranged on the first end of the connecting rod and one of the outer steel plate and the inner steel plate, and include: A lock head is connected to the first end of the connecting rod, and a flange is arranged on the outer periphery of the connecting rod near its first end; a lock component with a locking cavity is arranged on one of the outer steel plate and the inner steel plate, and a latch surrounding the cavity opening of the locking cavity is arranged on the lock component.

10. A method for manufacturing a structural body of a storage tank cylinder, characterized in that: include: Lifting the prepared structural module according to any one of claims 1 to 6 onto the foundation platform, and staggeringly splicing the structural modules in sequence according to the design plan, and splicing the inclined surfaces of the peripheral edges of the outer steel plates of two adjacent structural modules in pairs to form an outer weld bead, and splicing the inclined surfaces of the peripheral edges of the inner steel plates of two adjacent structural modules in pairs to form an inner weld bead; The outer weld bead and the inner weld bead are welded separately to form welds, so that the outer steel plates and the inner steel plates of each of the structural modules constituting the structural body of the tank cylinder are integrated into one, thereby completing the structural body of the tank cylinder having the inner steel plates and the outer steel plates and concrete poured between the inner steel plates and the outer steel plates.

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